via sysfs to userspace. If you wish to export this information,
say Y. Otherwise, say N.
-source "drivers/scsi/cxgb3i/Kconfig"
source "drivers/scsi/cxgbi/Kconfig"
source "drivers/scsi/bnx2i/Kconfig"
source "drivers/scsi/be2iscsi/Kconfig"
obj-$(CONFIG_SCSI_STEX) += stex.o
obj-$(CONFIG_SCSI_MVSAS) += mvsas/
obj-$(CONFIG_PS3_ROM) += ps3rom.o
-obj-$(CONFIG_SCSI_CXGB3_ISCSI) += libiscsi.o libiscsi_tcp.o cxgb3i/
+obj-$(CONFIG_SCSI_CXGB3_ISCSI) += libiscsi.o libiscsi_tcp.o cxgbi/
obj-$(CONFIG_SCSI_CXGB4_ISCSI) += libiscsi.o libiscsi_tcp.o cxgbi/
obj-$(CONFIG_SCSI_BNX2_ISCSI) += libiscsi.o bnx2i/
obj-$(CONFIG_BE2ISCSI) += libiscsi.o be2iscsi/
+++ /dev/null
-EXTRA_CFLAGS += -I$(srctree)/drivers/net/cxgb3
-
-cxgb3i-y := cxgb3i_init.o cxgb3i_iscsi.o cxgb3i_pdu.o cxgb3i_offload.o cxgb3i_ddp.o
-obj-$(CONFIG_SCSI_CXGB3_ISCSI) += cxgb3i.o
+++ /dev/null
-config SCSI_CXGB3_ISCSI
- tristate "Chelsio S3xx iSCSI support"
- depends on CHELSIO_T3_DEPENDS
- select CHELSIO_T3
- select SCSI_ISCSI_ATTRS
- ---help---
- This driver supports iSCSI offload for the Chelsio S3 series devices.
+++ /dev/null
-/*
- * cxgb3i.h: Chelsio S3xx iSCSI driver.
- *
- * Copyright (c) 2008 Chelsio Communications, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation.
- *
- * Written by: Karen Xie (kxie@chelsio.com)
- */
-
-#ifndef __CXGB3I_H__
-#define __CXGB3I_H__
-
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/errno.h>
-#include <linux/types.h>
-#include <linux/list.h>
-#include <linux/netdevice.h>
-#include <linux/scatterlist.h>
-#include <linux/skbuff.h>
-#include <scsi/libiscsi_tcp.h>
-
-/* from cxgb3 LLD */
-#include "common.h"
-#include "t3_cpl.h"
-#include "t3cdev.h"
-#include "cxgb3_ctl_defs.h"
-#include "cxgb3_offload.h"
-#include "firmware_exports.h"
-
-#include "cxgb3i_offload.h"
-#include "cxgb3i_ddp.h"
-
-#define CXGB3I_SCSI_HOST_QDEPTH 1024
-#define CXGB3I_MAX_TARGET CXGB3I_MAX_CONN
-#define CXGB3I_MAX_LUN 512
-#define ISCSI_PDU_NONPAYLOAD_MAX \
- (sizeof(struct iscsi_hdr) + ISCSI_MAX_AHS_SIZE + 2*ISCSI_DIGEST_SIZE)
-
-struct cxgb3i_adapter;
-struct cxgb3i_hba;
-struct cxgb3i_endpoint;
-
-/**
- * struct cxgb3i_hba - cxgb3i iscsi structure (per port)
- *
- * @snic: cxgb3i adapter containing this port
- * @ndev: pointer to netdev structure
- * @shost: pointer to scsi host structure
- */
-struct cxgb3i_hba {
- struct cxgb3i_adapter *snic;
- struct net_device *ndev;
- struct Scsi_Host *shost;
-};
-
-/**
- * struct cxgb3i_adapter - cxgb3i adapter structure (per pci)
- *
- * @listhead: list head to link elements
- * @lock: lock for this structure
- * @tdev: pointer to t3cdev used by cxgb3 driver
- * @pdev: pointer to pci dev
- * @hba_cnt: # of hbas (the same as # of ports)
- * @hba: all the hbas on this adapter
- * @flags: bit flag for adapter event/status
- * @tx_max_size: max. tx packet size supported
- * @rx_max_size: max. rx packet size supported
- * @tag_format: ddp tag format settings
- */
-#define CXGB3I_ADAPTER_FLAG_RESET 0x1
-struct cxgb3i_adapter {
- struct list_head list_head;
- spinlock_t lock;
- struct t3cdev *tdev;
- struct pci_dev *pdev;
- unsigned char hba_cnt;
- struct cxgb3i_hba *hba[MAX_NPORTS];
-
- unsigned int flags;
- unsigned int tx_max_size;
- unsigned int rx_max_size;
-
- struct cxgb3i_tag_format tag_format;
-};
-
-/**
- * struct cxgb3i_conn - cxgb3i iscsi connection
- *
- * @listhead: list head to link elements
- * @cep: pointer to iscsi_endpoint structure
- * @conn: pointer to iscsi_conn structure
- * @hba: pointer to the hba this conn. is going through
- * @task_idx_bits: # of bits needed for session->cmds_max
- */
-struct cxgb3i_conn {
- struct list_head list_head;
- struct cxgb3i_endpoint *cep;
- struct iscsi_conn *conn;
- struct cxgb3i_hba *hba;
- unsigned int task_idx_bits;
-};
-
-/**
- * struct cxgb3i_endpoint - iscsi tcp endpoint
- *
- * @c3cn: the h/w tcp connection representation
- * @hba: pointer to the hba this conn. is going through
- * @cconn: pointer to the associated cxgb3i iscsi connection
- */
-struct cxgb3i_endpoint {
- struct s3_conn *c3cn;
- struct cxgb3i_hba *hba;
- struct cxgb3i_conn *cconn;
-};
-
-/**
- * struct cxgb3i_task_data - private iscsi task data
- *
- * @nr_frags: # of coalesced page frags (from scsi sgl)
- * @frags: coalesced page frags (from scsi sgl)
- * @skb: tx pdu skb
- * @offset: data offset for the next pdu
- * @count: max. possible pdu payload
- * @sgoffset: offset to the first sg entry for a given offset
- */
-#define MAX_PDU_FRAGS ((ULP2_MAX_PDU_PAYLOAD + 512 - 1) / 512)
-struct cxgb3i_task_data {
- unsigned short nr_frags;
- skb_frag_t frags[MAX_PDU_FRAGS];
- struct sk_buff *skb;
- unsigned int offset;
- unsigned int count;
- unsigned int sgoffset;
-};
-
-int cxgb3i_iscsi_init(void);
-void cxgb3i_iscsi_cleanup(void);
-
-struct cxgb3i_adapter *cxgb3i_adapter_find_by_tdev(struct t3cdev *);
-void cxgb3i_adapter_open(struct t3cdev *);
-void cxgb3i_adapter_close(struct t3cdev *);
-
-struct cxgb3i_hba *cxgb3i_hba_host_add(struct cxgb3i_adapter *,
- struct net_device *);
-void cxgb3i_hba_host_remove(struct cxgb3i_hba *);
-
-int cxgb3i_pdu_init(void);
-void cxgb3i_pdu_cleanup(void);
-void cxgb3i_conn_cleanup_task(struct iscsi_task *);
-int cxgb3i_conn_alloc_pdu(struct iscsi_task *, u8);
-int cxgb3i_conn_init_pdu(struct iscsi_task *, unsigned int, unsigned int);
-int cxgb3i_conn_xmit_pdu(struct iscsi_task *);
-
-void cxgb3i_release_itt(struct iscsi_task *task, itt_t hdr_itt);
-int cxgb3i_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt);
-
-#endif
+++ /dev/null
-/*
- * cxgb3i_ddp.c: Chelsio S3xx iSCSI DDP Manager.
- *
- * Copyright (c) 2008 Chelsio Communications, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation.
- *
- * Written by: Karen Xie (kxie@chelsio.com)
- */
-
-#include <linux/slab.h>
-#include <linux/skbuff.h>
-#include <linux/scatterlist.h>
-
-/* from cxgb3 LLD */
-#include "common.h"
-#include "t3_cpl.h"
-#include "t3cdev.h"
-#include "cxgb3_ctl_defs.h"
-#include "cxgb3_offload.h"
-#include "firmware_exports.h"
-
-#include "cxgb3i_ddp.h"
-
-#define ddp_log_error(fmt...) printk(KERN_ERR "cxgb3i_ddp: ERR! " fmt)
-#define ddp_log_warn(fmt...) printk(KERN_WARNING "cxgb3i_ddp: WARN! " fmt)
-#define ddp_log_info(fmt...) printk(KERN_INFO "cxgb3i_ddp: " fmt)
-
-#ifdef __DEBUG_CXGB3I_DDP__
-#define ddp_log_debug(fmt, args...) \
- printk(KERN_INFO "cxgb3i_ddp: %s - " fmt, __func__ , ## args)
-#else
-#define ddp_log_debug(fmt...)
-#endif
-
-/*
- * iSCSI Direct Data Placement
- *
- * T3 h/w can directly place the iSCSI Data-In or Data-Out PDU's payload into
- * pre-posted final destination host-memory buffers based on the Initiator
- * Task Tag (ITT) in Data-In or Target Task Tag (TTT) in Data-Out PDUs.
- *
- * The host memory address is programmed into h/w in the format of pagepod
- * entries.
- * The location of the pagepod entry is encoded into ddp tag which is used or
- * is the base for ITT/TTT.
- */
-
-#define DDP_PGIDX_MAX 4
-#define DDP_THRESHOLD 2048
-static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 2, 4};
-static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16};
-static unsigned char page_idx = DDP_PGIDX_MAX;
-
-/*
- * functions to program the pagepod in h/w
- */
-static inline void ulp_mem_io_set_hdr(struct sk_buff *skb, unsigned int addr)
-{
- struct ulp_mem_io *req = (struct ulp_mem_io *)skb->head;
-
- req->wr.wr_lo = 0;
- req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_BYPASS));
- req->cmd_lock_addr = htonl(V_ULP_MEMIO_ADDR(addr >> 5) |
- V_ULPTX_CMD(ULP_MEM_WRITE));
- req->len = htonl(V_ULP_MEMIO_DATA_LEN(PPOD_SIZE >> 5) |
- V_ULPTX_NFLITS((PPOD_SIZE >> 3) + 1));
-}
-
-static int set_ddp_map(struct cxgb3i_ddp_info *ddp, struct pagepod_hdr *hdr,
- unsigned int idx, unsigned int npods,
- struct cxgb3i_gather_list *gl)
-{
- unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
- int i;
-
- for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
- struct sk_buff *skb = ddp->gl_skb[idx];
- struct pagepod *ppod;
- int j, pidx;
-
- /* hold on to the skb until we clear the ddp mapping */
- skb_get(skb);
-
- ulp_mem_io_set_hdr(skb, pm_addr);
- ppod = (struct pagepod *)
- (skb->head + sizeof(struct ulp_mem_io));
- memcpy(&(ppod->hdr), hdr, sizeof(struct pagepod));
- for (pidx = 4 * i, j = 0; j < 5; ++j, ++pidx)
- ppod->addr[j] = pidx < gl->nelem ?
- cpu_to_be64(gl->phys_addr[pidx]) : 0UL;
-
- skb->priority = CPL_PRIORITY_CONTROL;
- cxgb3_ofld_send(ddp->tdev, skb);
- }
- return 0;
-}
-
-static void clear_ddp_map(struct cxgb3i_ddp_info *ddp, unsigned int tag,
- unsigned int idx, unsigned int npods)
-{
- unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
- int i;
-
- for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
- struct sk_buff *skb = ddp->gl_skb[idx];
-
- if (!skb) {
- ddp_log_error("ddp tag 0x%x, 0x%x, %d/%u, skb NULL.\n",
- tag, idx, i, npods);
- continue;
- }
- ddp->gl_skb[idx] = NULL;
- memset((skb->head + sizeof(struct ulp_mem_io)), 0, PPOD_SIZE);
- ulp_mem_io_set_hdr(skb, pm_addr);
- skb->priority = CPL_PRIORITY_CONTROL;
- cxgb3_ofld_send(ddp->tdev, skb);
- }
-}
-
-static inline int ddp_find_unused_entries(struct cxgb3i_ddp_info *ddp,
- unsigned int start, unsigned int max,
- unsigned int count,
- struct cxgb3i_gather_list *gl)
-{
- unsigned int i, j, k;
-
- /* not enough entries */
- if ((max - start) < count)
- return -EBUSY;
-
- max -= count;
- spin_lock(&ddp->map_lock);
- for (i = start; i < max;) {
- for (j = 0, k = i; j < count; j++, k++) {
- if (ddp->gl_map[k])
- break;
- }
- if (j == count) {
- for (j = 0, k = i; j < count; j++, k++)
- ddp->gl_map[k] = gl;
- spin_unlock(&ddp->map_lock);
- return i;
- }
- i += j + 1;
- }
- spin_unlock(&ddp->map_lock);
- return -EBUSY;
-}
-
-static inline void ddp_unmark_entries(struct cxgb3i_ddp_info *ddp,
- int start, int count)
-{
- spin_lock(&ddp->map_lock);
- memset(&ddp->gl_map[start], 0,
- count * sizeof(struct cxgb3i_gather_list *));
- spin_unlock(&ddp->map_lock);
-}
-
-static inline void ddp_free_gl_skb(struct cxgb3i_ddp_info *ddp,
- int idx, int count)
-{
- int i;
-
- for (i = 0; i < count; i++, idx++)
- if (ddp->gl_skb[idx]) {
- kfree_skb(ddp->gl_skb[idx]);
- ddp->gl_skb[idx] = NULL;
- }
-}
-
-static inline int ddp_alloc_gl_skb(struct cxgb3i_ddp_info *ddp, int idx,
- int count, gfp_t gfp)
-{
- int i;
-
- for (i = 0; i < count; i++) {
- struct sk_buff *skb = alloc_skb(sizeof(struct ulp_mem_io) +
- PPOD_SIZE, gfp);
- if (skb) {
- ddp->gl_skb[idx + i] = skb;
- skb_put(skb, sizeof(struct ulp_mem_io) + PPOD_SIZE);
- } else {
- ddp_free_gl_skb(ddp, idx, i);
- return -ENOMEM;
- }
- }
- return 0;
-}
-
-/**
- * cxgb3i_ddp_find_page_index - return ddp page index for a given page size
- * @pgsz: page size
- * return the ddp page index, if no match is found return DDP_PGIDX_MAX.
- */
-int cxgb3i_ddp_find_page_index(unsigned long pgsz)
-{
- int i;
-
- for (i = 0; i < DDP_PGIDX_MAX; i++) {
- if (pgsz == (1UL << ddp_page_shift[i]))
- return i;
- }
- ddp_log_debug("ddp page size 0x%lx not supported.\n", pgsz);
- return DDP_PGIDX_MAX;
-}
-
-/**
- * cxgb3i_ddp_adjust_page_table - adjust page table with PAGE_SIZE
- * return the ddp page index, if no match is found return DDP_PGIDX_MAX.
- */
-int cxgb3i_ddp_adjust_page_table(void)
-{
- int i;
- unsigned int base_order, order;
-
- if (PAGE_SIZE < (1UL << ddp_page_shift[0])) {
- ddp_log_info("PAGE_SIZE 0x%lx too small, min. 0x%lx.\n",
- PAGE_SIZE, 1UL << ddp_page_shift[0]);
- return -EINVAL;
- }
-
- base_order = get_order(1UL << ddp_page_shift[0]);
- order = get_order(1 << PAGE_SHIFT);
- for (i = 0; i < DDP_PGIDX_MAX; i++) {
- /* first is the kernel page size, then just doubling the size */
- ddp_page_order[i] = order - base_order + i;
- ddp_page_shift[i] = PAGE_SHIFT + i;
- }
- return 0;
-}
-
-static inline void ddp_gl_unmap(struct pci_dev *pdev,
- struct cxgb3i_gather_list *gl)
-{
- int i;
-
- for (i = 0; i < gl->nelem; i++)
- pci_unmap_page(pdev, gl->phys_addr[i], PAGE_SIZE,
- PCI_DMA_FROMDEVICE);
-}
-
-static inline int ddp_gl_map(struct pci_dev *pdev,
- struct cxgb3i_gather_list *gl)
-{
- int i;
-
- for (i = 0; i < gl->nelem; i++) {
- gl->phys_addr[i] = pci_map_page(pdev, gl->pages[i], 0,
- PAGE_SIZE,
- PCI_DMA_FROMDEVICE);
- if (unlikely(pci_dma_mapping_error(pdev, gl->phys_addr[i])))
- goto unmap;
- }
-
- return i;
-
-unmap:
- if (i) {
- unsigned int nelem = gl->nelem;
-
- gl->nelem = i;
- ddp_gl_unmap(pdev, gl);
- gl->nelem = nelem;
- }
- return -ENOMEM;
-}
-
-/**
- * cxgb3i_ddp_make_gl - build ddp page buffer list
- * @xferlen: total buffer length
- * @sgl: page buffer scatter-gather list
- * @sgcnt: # of page buffers
- * @pdev: pci_dev, used for pci map
- * @gfp: allocation mode
- *
- * construct a ddp page buffer list from the scsi scattergather list.
- * coalesce buffers as much as possible, and obtain dma addresses for
- * each page.
- *
- * Return the cxgb3i_gather_list constructed from the page buffers if the
- * memory can be used for ddp. Return NULL otherwise.
- */
-struct cxgb3i_gather_list *cxgb3i_ddp_make_gl(unsigned int xferlen,
- struct scatterlist *sgl,
- unsigned int sgcnt,
- struct pci_dev *pdev,
- gfp_t gfp)
-{
- struct cxgb3i_gather_list *gl;
- struct scatterlist *sg = sgl;
- struct page *sgpage = sg_page(sg);
- unsigned int sglen = sg->length;
- unsigned int sgoffset = sg->offset;
- unsigned int npages = (xferlen + sgoffset + PAGE_SIZE - 1) >>
- PAGE_SHIFT;
- int i = 1, j = 0;
-
- if (xferlen < DDP_THRESHOLD) {
- ddp_log_debug("xfer %u < threshold %u, no ddp.\n",
- xferlen, DDP_THRESHOLD);
- return NULL;
- }
-
- gl = kzalloc(sizeof(struct cxgb3i_gather_list) +
- npages * (sizeof(dma_addr_t) + sizeof(struct page *)),
- gfp);
- if (!gl)
- return NULL;
-
- gl->pages = (struct page **)&gl->phys_addr[npages];
- gl->length = xferlen;
- gl->offset = sgoffset;
- gl->pages[0] = sgpage;
-
- sg = sg_next(sg);
- while (sg) {
- struct page *page = sg_page(sg);
-
- if (sgpage == page && sg->offset == sgoffset + sglen)
- sglen += sg->length;
- else {
- /* make sure the sgl is fit for ddp:
- * each has the same page size, and
- * all of the middle pages are used completely
- */
- if ((j && sgoffset) ||
- ((i != sgcnt - 1) &&
- ((sglen + sgoffset) & ~PAGE_MASK)))
- goto error_out;
-
- j++;
- if (j == gl->nelem || sg->offset)
- goto error_out;
- gl->pages[j] = page;
- sglen = sg->length;
- sgoffset = sg->offset;
- sgpage = page;
- }
- i++;
- sg = sg_next(sg);
- }
- gl->nelem = ++j;
-
- if (ddp_gl_map(pdev, gl) < 0)
- goto error_out;
-
- return gl;
-
-error_out:
- kfree(gl);
- return NULL;
-}
-
-/**
- * cxgb3i_ddp_release_gl - release a page buffer list
- * @gl: a ddp page buffer list
- * @pdev: pci_dev used for pci_unmap
- * free a ddp page buffer list resulted from cxgb3i_ddp_make_gl().
- */
-void cxgb3i_ddp_release_gl(struct cxgb3i_gather_list *gl,
- struct pci_dev *pdev)
-{
- ddp_gl_unmap(pdev, gl);
- kfree(gl);
-}
-
-/**
- * cxgb3i_ddp_tag_reserve - set up ddp for a data transfer
- * @tdev: t3cdev adapter
- * @tid: connection id
- * @tformat: tag format
- * @tagp: contains s/w tag initially, will be updated with ddp/hw tag
- * @gl: the page momory list
- * @gfp: allocation mode
- *
- * ddp setup for a given page buffer list and construct the ddp tag.
- * return 0 if success, < 0 otherwise.
- */
-int cxgb3i_ddp_tag_reserve(struct t3cdev *tdev, unsigned int tid,
- struct cxgb3i_tag_format *tformat, u32 *tagp,
- struct cxgb3i_gather_list *gl, gfp_t gfp)
-{
- struct cxgb3i_ddp_info *ddp = tdev->ulp_iscsi;
- struct pagepod_hdr hdr;
- unsigned int npods;
- int idx = -1;
- int err = -ENOMEM;
- u32 sw_tag = *tagp;
- u32 tag;
-
- if (page_idx >= DDP_PGIDX_MAX || !ddp || !gl || !gl->nelem ||
- gl->length < DDP_THRESHOLD) {
- ddp_log_debug("pgidx %u, xfer %u/%u, NO ddp.\n",
- page_idx, gl->length, DDP_THRESHOLD);
- return -EINVAL;
- }
-
- npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
-
- if (ddp->idx_last == ddp->nppods)
- idx = ddp_find_unused_entries(ddp, 0, ddp->nppods, npods, gl);
- else {
- idx = ddp_find_unused_entries(ddp, ddp->idx_last + 1,
- ddp->nppods, npods, gl);
- if (idx < 0 && ddp->idx_last >= npods) {
- idx = ddp_find_unused_entries(ddp, 0,
- min(ddp->idx_last + npods, ddp->nppods),
- npods, gl);
- }
- }
- if (idx < 0) {
- ddp_log_debug("xferlen %u, gl %u, npods %u NO DDP.\n",
- gl->length, gl->nelem, npods);
- return idx;
- }
-
- err = ddp_alloc_gl_skb(ddp, idx, npods, gfp);
- if (err < 0)
- goto unmark_entries;
-
- tag = cxgb3i_ddp_tag_base(tformat, sw_tag);
- tag |= idx << PPOD_IDX_SHIFT;
-
- hdr.rsvd = 0;
- hdr.vld_tid = htonl(F_PPOD_VALID | V_PPOD_TID(tid));
- hdr.pgsz_tag_clr = htonl(tag & ddp->rsvd_tag_mask);
- hdr.maxoffset = htonl(gl->length);
- hdr.pgoffset = htonl(gl->offset);
-
- err = set_ddp_map(ddp, &hdr, idx, npods, gl);
- if (err < 0)
- goto free_gl_skb;
-
- ddp->idx_last = idx;
- ddp_log_debug("xfer %u, gl %u,%u, tid 0x%x, 0x%x -> 0x%x(%u,%u).\n",
- gl->length, gl->nelem, gl->offset, tid, sw_tag, tag,
- idx, npods);
- *tagp = tag;
- return 0;
-
-free_gl_skb:
- ddp_free_gl_skb(ddp, idx, npods);
-unmark_entries:
- ddp_unmark_entries(ddp, idx, npods);
- return err;
-}
-
-/**
- * cxgb3i_ddp_tag_release - release a ddp tag
- * @tdev: t3cdev adapter
- * @tag: ddp tag
- * ddp cleanup for a given ddp tag and release all the resources held
- */
-void cxgb3i_ddp_tag_release(struct t3cdev *tdev, u32 tag)
-{
- struct cxgb3i_ddp_info *ddp = tdev->ulp_iscsi;
- u32 idx;
-
- if (!ddp) {
- ddp_log_error("release ddp tag 0x%x, ddp NULL.\n", tag);
- return;
- }
-
- idx = (tag >> PPOD_IDX_SHIFT) & ddp->idx_mask;
- if (idx < ddp->nppods) {
- struct cxgb3i_gather_list *gl = ddp->gl_map[idx];
- unsigned int npods;
-
- if (!gl || !gl->nelem) {
- ddp_log_error("release 0x%x, idx 0x%x, gl 0x%p, %u.\n",
- tag, idx, gl, gl ? gl->nelem : 0);
- return;
- }
- npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
- ddp_log_debug("ddp tag 0x%x, release idx 0x%x, npods %u.\n",
- tag, idx, npods);
- clear_ddp_map(ddp, tag, idx, npods);
- ddp_unmark_entries(ddp, idx, npods);
- cxgb3i_ddp_release_gl(gl, ddp->pdev);
- } else
- ddp_log_error("ddp tag 0x%x, idx 0x%x > max 0x%x.\n",
- tag, idx, ddp->nppods);
-}
-
-static int setup_conn_pgidx(struct t3cdev *tdev, unsigned int tid, int pg_idx,
- int reply)
-{
- struct sk_buff *skb = alloc_skb(sizeof(struct cpl_set_tcb_field),
- GFP_KERNEL);
- struct cpl_set_tcb_field *req;
- u64 val = pg_idx < DDP_PGIDX_MAX ? pg_idx : 0;
-
- if (!skb)
- return -ENOMEM;
-
- /* set up ulp submode and page size */
- req = (struct cpl_set_tcb_field *)skb_put(skb, sizeof(*req));
- req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
- req->wr.wr_lo = 0;
- OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
- req->reply = V_NO_REPLY(reply ? 0 : 1);
- req->cpu_idx = 0;
- req->word = htons(31);
- req->mask = cpu_to_be64(0xF0000000);
- req->val = cpu_to_be64(val << 28);
- skb->priority = CPL_PRIORITY_CONTROL;
-
- cxgb3_ofld_send(tdev, skb);
- return 0;
-}
-
-/**
- * cxgb3i_setup_conn_host_pagesize - setup the conn.'s ddp page size
- * @tdev: t3cdev adapter
- * @tid: connection id
- * @reply: request reply from h/w
- * set up the ddp page size based on the host PAGE_SIZE for a connection
- * identified by tid
- */
-int cxgb3i_setup_conn_host_pagesize(struct t3cdev *tdev, unsigned int tid,
- int reply)
-{
- return setup_conn_pgidx(tdev, tid, page_idx, reply);
-}
-
-/**
- * cxgb3i_setup_conn_pagesize - setup the conn.'s ddp page size
- * @tdev: t3cdev adapter
- * @tid: connection id
- * @reply: request reply from h/w
- * @pgsz: ddp page size
- * set up the ddp page size for a connection identified by tid
- */
-int cxgb3i_setup_conn_pagesize(struct t3cdev *tdev, unsigned int tid,
- int reply, unsigned long pgsz)
-{
- int pgidx = cxgb3i_ddp_find_page_index(pgsz);
-
- return setup_conn_pgidx(tdev, tid, pgidx, reply);
-}
-
-/**
- * cxgb3i_setup_conn_digest - setup conn. digest setting
- * @tdev: t3cdev adapter
- * @tid: connection id
- * @hcrc: header digest enabled
- * @dcrc: data digest enabled
- * @reply: request reply from h/w
- * set up the iscsi digest settings for a connection identified by tid
- */
-int cxgb3i_setup_conn_digest(struct t3cdev *tdev, unsigned int tid,
- int hcrc, int dcrc, int reply)
-{
- struct sk_buff *skb = alloc_skb(sizeof(struct cpl_set_tcb_field),
- GFP_KERNEL);
- struct cpl_set_tcb_field *req;
- u64 val = (hcrc ? 1 : 0) | (dcrc ? 2 : 0);
-
- if (!skb)
- return -ENOMEM;
-
- /* set up ulp submode and page size */
- req = (struct cpl_set_tcb_field *)skb_put(skb, sizeof(*req));
- req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
- req->wr.wr_lo = 0;
- OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
- req->reply = V_NO_REPLY(reply ? 0 : 1);
- req->cpu_idx = 0;
- req->word = htons(31);
- req->mask = cpu_to_be64(0x0F000000);
- req->val = cpu_to_be64(val << 24);
- skb->priority = CPL_PRIORITY_CONTROL;
-
- cxgb3_ofld_send(tdev, skb);
- return 0;
-}
-
-
-/**
- * cxgb3i_adapter_ddp_info - read the adapter's ddp information
- * @tdev: t3cdev adapter
- * @tformat: tag format
- * @txsz: max tx pdu payload size, filled in by this func.
- * @rxsz: max rx pdu payload size, filled in by this func.
- * setup the tag format for a given iscsi entity
- */
-int cxgb3i_adapter_ddp_info(struct t3cdev *tdev,
- struct cxgb3i_tag_format *tformat,
- unsigned int *txsz, unsigned int *rxsz)
-{
- struct cxgb3i_ddp_info *ddp;
- unsigned char idx_bits;
-
- if (!tformat)
- return -EINVAL;
-
- if (!tdev->ulp_iscsi)
- return -EINVAL;
-
- ddp = (struct cxgb3i_ddp_info *)tdev->ulp_iscsi;
-
- idx_bits = 32 - tformat->sw_bits;
- tformat->rsvd_bits = ddp->idx_bits;
- tformat->rsvd_shift = PPOD_IDX_SHIFT;
- tformat->rsvd_mask = (1 << tformat->rsvd_bits) - 1;
-
- ddp_log_info("tag format: sw %u, rsvd %u,%u, mask 0x%x.\n",
- tformat->sw_bits, tformat->rsvd_bits,
- tformat->rsvd_shift, tformat->rsvd_mask);
-
- *txsz = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
- ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
- *rxsz = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
- ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
- ddp_log_info("max payload size: %u/%u, %u/%u.\n",
- *txsz, ddp->max_txsz, *rxsz, ddp->max_rxsz);
- return 0;
-}
-
-/**
- * cxgb3i_ddp_cleanup - release the cxgb3 adapter's ddp resource
- * @tdev: t3cdev adapter
- * release all the resource held by the ddp pagepod manager for a given
- * adapter if needed
- */
-
-static void ddp_cleanup(struct kref *kref)
-{
- struct cxgb3i_ddp_info *ddp = container_of(kref,
- struct cxgb3i_ddp_info,
- refcnt);
- int i = 0;
-
- ddp_log_info("kref release ddp 0x%p, t3dev 0x%p.\n", ddp, ddp->tdev);
-
- ddp->tdev->ulp_iscsi = NULL;
- while (i < ddp->nppods) {
- struct cxgb3i_gather_list *gl = ddp->gl_map[i];
- if (gl) {
- int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
- >> PPOD_PAGES_SHIFT;
- ddp_log_info("t3dev 0x%p, ddp %d + %d.\n",
- ddp->tdev, i, npods);
- kfree(gl);
- ddp_free_gl_skb(ddp, i, npods);
- i += npods;
- } else
- i++;
- }
- cxgb3i_free_big_mem(ddp);
-}
-
-void cxgb3i_ddp_cleanup(struct t3cdev *tdev)
-{
- struct cxgb3i_ddp_info *ddp = (struct cxgb3i_ddp_info *)tdev->ulp_iscsi;
-
- ddp_log_info("t3dev 0x%p, release ddp 0x%p.\n", tdev, ddp);
- if (ddp)
- kref_put(&ddp->refcnt, ddp_cleanup);
-}
-
-/**
- * ddp_init - initialize the cxgb3 adapter's ddp resource
- * @tdev: t3cdev adapter
- * initialize the ddp pagepod manager for a given adapter
- */
-static void ddp_init(struct t3cdev *tdev)
-{
- struct cxgb3i_ddp_info *ddp = tdev->ulp_iscsi;
- struct ulp_iscsi_info uinfo;
- unsigned int ppmax, bits;
- int i, err;
-
- if (ddp) {
- kref_get(&ddp->refcnt);
- ddp_log_warn("t3dev 0x%p, ddp 0x%p already set up.\n",
- tdev, tdev->ulp_iscsi);
- return;
- }
-
- err = tdev->ctl(tdev, ULP_ISCSI_GET_PARAMS, &uinfo);
- if (err < 0) {
- ddp_log_error("%s, failed to get iscsi param err=%d.\n",
- tdev->name, err);
- return;
- }
-
- ppmax = (uinfo.ulimit - uinfo.llimit + 1) >> PPOD_SIZE_SHIFT;
- bits = __ilog2_u32(ppmax) + 1;
- if (bits > PPOD_IDX_MAX_SIZE)
- bits = PPOD_IDX_MAX_SIZE;
- ppmax = (1 << (bits - 1)) - 1;
-
- ddp = cxgb3i_alloc_big_mem(sizeof(struct cxgb3i_ddp_info) +
- ppmax *
- (sizeof(struct cxgb3i_gather_list *) +
- sizeof(struct sk_buff *)),
- GFP_KERNEL);
- if (!ddp) {
- ddp_log_warn("%s unable to alloc ddp 0x%d, ddp disabled.\n",
- tdev->name, ppmax);
- return;
- }
- ddp->gl_map = (struct cxgb3i_gather_list **)(ddp + 1);
- ddp->gl_skb = (struct sk_buff **)(((char *)ddp->gl_map) +
- ppmax *
- sizeof(struct cxgb3i_gather_list *));
- spin_lock_init(&ddp->map_lock);
- kref_init(&ddp->refcnt);
-
- ddp->tdev = tdev;
- ddp->pdev = uinfo.pdev;
- ddp->max_txsz = min_t(unsigned int, uinfo.max_txsz, ULP2_MAX_PKT_SIZE);
- ddp->max_rxsz = min_t(unsigned int, uinfo.max_rxsz, ULP2_MAX_PKT_SIZE);
- ddp->llimit = uinfo.llimit;
- ddp->ulimit = uinfo.ulimit;
- ddp->nppods = ppmax;
- ddp->idx_last = ppmax;
- ddp->idx_bits = bits;
- ddp->idx_mask = (1 << bits) - 1;
- ddp->rsvd_tag_mask = (1 << (bits + PPOD_IDX_SHIFT)) - 1;
-
- uinfo.tagmask = ddp->idx_mask << PPOD_IDX_SHIFT;
- for (i = 0; i < DDP_PGIDX_MAX; i++)
- uinfo.pgsz_factor[i] = ddp_page_order[i];
- uinfo.ulimit = uinfo.llimit + (ppmax << PPOD_SIZE_SHIFT);
-
- err = tdev->ctl(tdev, ULP_ISCSI_SET_PARAMS, &uinfo);
- if (err < 0) {
- ddp_log_warn("%s unable to set iscsi param err=%d, "
- "ddp disabled.\n", tdev->name, err);
- goto free_ddp_map;
- }
-
- tdev->ulp_iscsi = ddp;
-
- ddp_log_info("tdev 0x%p, nppods %u, bits %u, mask 0x%x,0x%x pkt %u/%u,"
- " %u/%u.\n",
- tdev, ppmax, ddp->idx_bits, ddp->idx_mask,
- ddp->rsvd_tag_mask, ddp->max_txsz, uinfo.max_txsz,
- ddp->max_rxsz, uinfo.max_rxsz);
- return;
-
-free_ddp_map:
- cxgb3i_free_big_mem(ddp);
-}
-
-/**
- * cxgb3i_ddp_init - initialize ddp functions
- */
-void cxgb3i_ddp_init(struct t3cdev *tdev)
-{
- if (page_idx == DDP_PGIDX_MAX) {
- page_idx = cxgb3i_ddp_find_page_index(PAGE_SIZE);
-
- if (page_idx == DDP_PGIDX_MAX) {
- ddp_log_info("system PAGE_SIZE %lu, update hw.\n",
- PAGE_SIZE);
- if (cxgb3i_ddp_adjust_page_table() < 0) {
- ddp_log_info("PAGE_SIZE %lu, ddp disabled.\n",
- PAGE_SIZE);
- return;
- }
- page_idx = cxgb3i_ddp_find_page_index(PAGE_SIZE);
- }
- ddp_log_info("system PAGE_SIZE %lu, ddp idx %u.\n",
- PAGE_SIZE, page_idx);
- }
- ddp_init(tdev);
-}
+++ /dev/null
-/*
- * cxgb3i_ddp.h: Chelsio S3xx iSCSI DDP Manager.
- *
- * Copyright (c) 2008 Chelsio Communications, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation.
- *
- * Written by: Karen Xie (kxie@chelsio.com)
- */
-
-#ifndef __CXGB3I_ULP2_DDP_H__
-#define __CXGB3I_ULP2_DDP_H__
-
-#include <linux/slab.h>
-#include <linux/vmalloc.h>
-
-/**
- * struct cxgb3i_tag_format - cxgb3i ulp tag format for an iscsi entity
- *
- * @sw_bits: # of bits used by iscsi software layer
- * @rsvd_bits: # of bits used by h/w
- * @rsvd_shift: h/w bits shift left
- * @rsvd_mask: reserved bit mask
- */
-struct cxgb3i_tag_format {
- unsigned char sw_bits;
- unsigned char rsvd_bits;
- unsigned char rsvd_shift;
- unsigned char filler[1];
- u32 rsvd_mask;
-};
-
-/**
- * struct cxgb3i_gather_list - cxgb3i direct data placement memory
- *
- * @tag: ddp tag
- * @length: total data buffer length
- * @offset: initial offset to the 1st page
- * @nelem: # of pages
- * @pages: page pointers
- * @phys_addr: physical address
- */
-struct cxgb3i_gather_list {
- u32 tag;
- unsigned int length;
- unsigned int offset;
- unsigned int nelem;
- struct page **pages;
- dma_addr_t phys_addr[0];
-};
-
-/**
- * struct cxgb3i_ddp_info - cxgb3i direct data placement for pdu payload
- *
- * @list: list head to link elements
- * @refcnt: ref. count
- * @tdev: pointer to t3cdev used by cxgb3 driver
- * @max_txsz: max tx packet size for ddp
- * @max_rxsz: max rx packet size for ddp
- * @llimit: lower bound of the page pod memory
- * @ulimit: upper bound of the page pod memory
- * @nppods: # of page pod entries
- * @idx_last: page pod entry last used
- * @idx_bits: # of bits the pagepod index would take
- * @idx_mask: pagepod index mask
- * @rsvd_tag_mask: tag mask
- * @map_lock: lock to synchonize access to the page pod map
- * @gl_map: ddp memory gather list
- * @gl_skb: skb used to program the pagepod
- */
-struct cxgb3i_ddp_info {
- struct list_head list;
- struct kref refcnt;
- struct t3cdev *tdev;
- struct pci_dev *pdev;
- unsigned int max_txsz;
- unsigned int max_rxsz;
- unsigned int llimit;
- unsigned int ulimit;
- unsigned int nppods;
- unsigned int idx_last;
- unsigned char idx_bits;
- unsigned char filler[3];
- u32 idx_mask;
- u32 rsvd_tag_mask;
- spinlock_t map_lock;
- struct cxgb3i_gather_list **gl_map;
- struct sk_buff **gl_skb;
-};
-
-#define ISCSI_PDU_NONPAYLOAD_LEN 312 /* bhs(48) + ahs(256) + digest(8) */
-#define ULP2_MAX_PKT_SIZE 16224
-#define ULP2_MAX_PDU_PAYLOAD (ULP2_MAX_PKT_SIZE - ISCSI_PDU_NONPAYLOAD_LEN)
-#define PPOD_PAGES_MAX 4
-#define PPOD_PAGES_SHIFT 2 /* 4 pages per pod */
-
-/*
- * struct pagepod_hdr, pagepod - pagepod format
- */
-struct pagepod_hdr {
- u32 vld_tid;
- u32 pgsz_tag_clr;
- u32 maxoffset;
- u32 pgoffset;
- u64 rsvd;
-};
-
-struct pagepod {
- struct pagepod_hdr hdr;
- u64 addr[PPOD_PAGES_MAX + 1];
-};
-
-#define PPOD_SIZE sizeof(struct pagepod) /* 64 */
-#define PPOD_SIZE_SHIFT 6
-
-#define PPOD_COLOR_SHIFT 0
-#define PPOD_COLOR_SIZE 6
-#define PPOD_COLOR_MASK ((1 << PPOD_COLOR_SIZE) - 1)
-
-#define PPOD_IDX_SHIFT PPOD_COLOR_SIZE
-#define PPOD_IDX_MAX_SIZE 24
-
-#define S_PPOD_TID 0
-#define M_PPOD_TID 0xFFFFFF
-#define V_PPOD_TID(x) ((x) << S_PPOD_TID)
-
-#define S_PPOD_VALID 24
-#define V_PPOD_VALID(x) ((x) << S_PPOD_VALID)
-#define F_PPOD_VALID V_PPOD_VALID(1U)
-
-#define S_PPOD_COLOR 0
-#define M_PPOD_COLOR 0x3F
-#define V_PPOD_COLOR(x) ((x) << S_PPOD_COLOR)
-
-#define S_PPOD_TAG 6
-#define M_PPOD_TAG 0xFFFFFF
-#define V_PPOD_TAG(x) ((x) << S_PPOD_TAG)
-
-#define S_PPOD_PGSZ 30
-#define M_PPOD_PGSZ 0x3
-#define V_PPOD_PGSZ(x) ((x) << S_PPOD_PGSZ)
-
-/*
- * large memory chunk allocation/release
- * use vmalloc() if kmalloc() fails
- */
-static inline void *cxgb3i_alloc_big_mem(unsigned int size,
- gfp_t gfp)
-{
- void *p = kmalloc(size, gfp);
- if (!p)
- p = vmalloc(size);
- if (p)
- memset(p, 0, size);
- return p;
-}
-
-static inline void cxgb3i_free_big_mem(void *addr)
-{
- if (is_vmalloc_addr(addr))
- vfree(addr);
- else
- kfree(addr);
-}
-
-/*
- * cxgb3i ddp tag are 32 bits, it consists of reserved bits used by h/w and
- * non-reserved bits that can be used by the iscsi s/w.
- * The reserved bits are identified by the rsvd_bits and rsvd_shift fields
- * in struct cxgb3i_tag_format.
- *
- * The upper most reserved bit can be used to check if a tag is ddp tag or not:
- * if the bit is 0, the tag is a valid ddp tag
- */
-
-/**
- * cxgb3i_is_ddp_tag - check if a given tag is a hw/ddp tag
- * @tformat: tag format information
- * @tag: tag to be checked
- *
- * return true if the tag is a ddp tag, false otherwise.
- */
-static inline int cxgb3i_is_ddp_tag(struct cxgb3i_tag_format *tformat, u32 tag)
-{
- return !(tag & (1 << (tformat->rsvd_bits + tformat->rsvd_shift - 1)));
-}
-
-/**
- * cxgb3i_sw_tag_usable - check if s/w tag has enough bits left for hw bits
- * @tformat: tag format information
- * @sw_tag: s/w tag to be checked
- *
- * return true if the tag can be used for hw ddp tag, false otherwise.
- */
-static inline int cxgb3i_sw_tag_usable(struct cxgb3i_tag_format *tformat,
- u32 sw_tag)
-{
- sw_tag >>= (32 - tformat->rsvd_bits);
- return !sw_tag;
-}
-
-/**
- * cxgb3i_set_non_ddp_tag - mark a given s/w tag as an invalid ddp tag
- * @tformat: tag format information
- * @sw_tag: s/w tag to be checked
- *
- * insert 1 at the upper most reserved bit to mark it as an invalid ddp tag.
- */
-static inline u32 cxgb3i_set_non_ddp_tag(struct cxgb3i_tag_format *tformat,
- u32 sw_tag)
-{
- unsigned char shift = tformat->rsvd_bits + tformat->rsvd_shift - 1;
- u32 mask = (1 << shift) - 1;
-
- if (sw_tag && (sw_tag & ~mask)) {
- u32 v1 = sw_tag & ((1 << shift) - 1);
- u32 v2 = (sw_tag >> (shift - 1)) << shift;
-
- return v2 | v1 | 1 << shift;
- }
- return sw_tag | 1 << shift;
-}
-
-/**
- * cxgb3i_ddp_tag_base - shift s/w tag bits so that reserved bits are not used
- * @tformat: tag format information
- * @sw_tag: s/w tag to be checked
- */
-static inline u32 cxgb3i_ddp_tag_base(struct cxgb3i_tag_format *tformat,
- u32 sw_tag)
-{
- u32 mask = (1 << tformat->rsvd_shift) - 1;
-
- if (sw_tag && (sw_tag & ~mask)) {
- u32 v1 = sw_tag & mask;
- u32 v2 = sw_tag >> tformat->rsvd_shift;
-
- v2 <<= tformat->rsvd_shift + tformat->rsvd_bits;
- return v2 | v1;
- }
- return sw_tag;
-}
-
-/**
- * cxgb3i_tag_rsvd_bits - get the reserved bits used by the h/w
- * @tformat: tag format information
- * @tag: tag to be checked
- *
- * return the reserved bits in the tag
- */
-static inline u32 cxgb3i_tag_rsvd_bits(struct cxgb3i_tag_format *tformat,
- u32 tag)
-{
- if (cxgb3i_is_ddp_tag(tformat, tag))
- return (tag >> tformat->rsvd_shift) & tformat->rsvd_mask;
- return 0;
-}
-
-/**
- * cxgb3i_tag_nonrsvd_bits - get the non-reserved bits used by the s/w
- * @tformat: tag format information
- * @tag: tag to be checked
- *
- * return the non-reserved bits in the tag.
- */
-static inline u32 cxgb3i_tag_nonrsvd_bits(struct cxgb3i_tag_format *tformat,
- u32 tag)
-{
- unsigned char shift = tformat->rsvd_bits + tformat->rsvd_shift - 1;
- u32 v1, v2;
-
- if (cxgb3i_is_ddp_tag(tformat, tag)) {
- v1 = tag & ((1 << tformat->rsvd_shift) - 1);
- v2 = (tag >> (shift + 1)) << tformat->rsvd_shift;
- } else {
- u32 mask = (1 << shift) - 1;
-
- tag &= ~(1 << shift);
- v1 = tag & mask;
- v2 = (tag >> 1) & ~mask;
- }
- return v1 | v2;
-}
-
-int cxgb3i_ddp_tag_reserve(struct t3cdev *, unsigned int tid,
- struct cxgb3i_tag_format *, u32 *tag,
- struct cxgb3i_gather_list *, gfp_t gfp);
-void cxgb3i_ddp_tag_release(struct t3cdev *, u32 tag);
-
-struct cxgb3i_gather_list *cxgb3i_ddp_make_gl(unsigned int xferlen,
- struct scatterlist *sgl,
- unsigned int sgcnt,
- struct pci_dev *pdev,
- gfp_t gfp);
-void cxgb3i_ddp_release_gl(struct cxgb3i_gather_list *gl,
- struct pci_dev *pdev);
-
-int cxgb3i_setup_conn_host_pagesize(struct t3cdev *, unsigned int tid,
- int reply);
-int cxgb3i_setup_conn_pagesize(struct t3cdev *, unsigned int tid, int reply,
- unsigned long pgsz);
-int cxgb3i_setup_conn_digest(struct t3cdev *, unsigned int tid,
- int hcrc, int dcrc, int reply);
-int cxgb3i_ddp_find_page_index(unsigned long pgsz);
-int cxgb3i_adapter_ddp_info(struct t3cdev *, struct cxgb3i_tag_format *,
- unsigned int *txsz, unsigned int *rxsz);
-
-void cxgb3i_ddp_init(struct t3cdev *);
-void cxgb3i_ddp_cleanup(struct t3cdev *);
-#endif
+++ /dev/null
-/* cxgb3i_init.c: Chelsio S3xx iSCSI driver.
- *
- * Copyright (c) 2008 Chelsio Communications, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation.
- *
- * Written by: Karen Xie (kxie@chelsio.com)
- */
-
-#include "cxgb3i.h"
-
-#define DRV_MODULE_NAME "cxgb3i"
-#define DRV_MODULE_VERSION "1.0.2"
-#define DRV_MODULE_RELDATE "Mar. 2009"
-
-static char version[] =
- "Chelsio S3xx iSCSI Driver " DRV_MODULE_NAME
- " v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
-
-MODULE_AUTHOR("Karen Xie <kxie@chelsio.com>");
-MODULE_DESCRIPTION("Chelsio S3xx iSCSI Driver");
-MODULE_LICENSE("GPL");
-MODULE_VERSION(DRV_MODULE_VERSION);
-
-static void open_s3_dev(struct t3cdev *);
-static void close_s3_dev(struct t3cdev *);
-static void s3_event_handler(struct t3cdev *tdev, u32 event, u32 port);
-
-static cxgb3_cpl_handler_func cxgb3i_cpl_handlers[NUM_CPL_CMDS];
-static struct cxgb3_client t3c_client = {
- .name = "iscsi_cxgb3",
- .handlers = cxgb3i_cpl_handlers,
- .add = open_s3_dev,
- .remove = close_s3_dev,
- .event_handler = s3_event_handler,
-};
-
-/**
- * open_s3_dev - register with cxgb3 LLD
- * @t3dev: cxgb3 adapter instance
- */
-static void open_s3_dev(struct t3cdev *t3dev)
-{
- static int vers_printed;
-
- if (!vers_printed) {
- printk(KERN_INFO "%s", version);
- vers_printed = 1;
- }
-
- cxgb3i_ddp_init(t3dev);
- cxgb3i_sdev_add(t3dev, &t3c_client);
- cxgb3i_adapter_open(t3dev);
-}
-
-/**
- * close_s3_dev - de-register with cxgb3 LLD
- * @t3dev: cxgb3 adapter instance
- */
-static void close_s3_dev(struct t3cdev *t3dev)
-{
- cxgb3i_adapter_close(t3dev);
- cxgb3i_sdev_remove(t3dev);
- cxgb3i_ddp_cleanup(t3dev);
-}
-
-static void s3_event_handler(struct t3cdev *tdev, u32 event, u32 port)
-{
- struct cxgb3i_adapter *snic = cxgb3i_adapter_find_by_tdev(tdev);
-
- cxgb3i_log_info("snic 0x%p, tdev 0x%p, event 0x%x, port 0x%x.\n",
- snic, tdev, event, port);
- if (!snic)
- return;
-
- switch (event) {
- case OFFLOAD_STATUS_DOWN:
- snic->flags |= CXGB3I_ADAPTER_FLAG_RESET;
- break;
- case OFFLOAD_STATUS_UP:
- snic->flags &= ~CXGB3I_ADAPTER_FLAG_RESET;
- break;
- }
-}
-
-/**
- * cxgb3i_init_module - module init entry point
- *
- * initialize any driver wide global data structures and register itself
- * with the cxgb3 module
- */
-static int __init cxgb3i_init_module(void)
-{
- int err;
-
- err = cxgb3i_sdev_init(cxgb3i_cpl_handlers);
- if (err < 0)
- return err;
-
- err = cxgb3i_iscsi_init();
- if (err < 0)
- return err;
-
- err = cxgb3i_pdu_init();
- if (err < 0) {
- cxgb3i_iscsi_cleanup();
- return err;
- }
-
- cxgb3_register_client(&t3c_client);
-
- return 0;
-}
-
-/**
- * cxgb3i_exit_module - module cleanup/exit entry point
- *
- * go through the driver hba list and for each hba, release any resource held.
- * and unregisters iscsi transport and the cxgb3 module
- */
-static void __exit cxgb3i_exit_module(void)
-{
- cxgb3_unregister_client(&t3c_client);
- cxgb3i_pdu_cleanup();
- cxgb3i_iscsi_cleanup();
- cxgb3i_sdev_cleanup();
-}
-
-module_init(cxgb3i_init_module);
-module_exit(cxgb3i_exit_module);
+++ /dev/null
-/* cxgb3i_iscsi.c: Chelsio S3xx iSCSI driver.
- *
- * Copyright (c) 2008 Chelsio Communications, Inc.
- * Copyright (c) 2008 Mike Christie
- * Copyright (c) 2008 Red Hat, Inc. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation.
- *
- * Written by: Karen Xie (kxie@chelsio.com)
- */
-
-#include <linux/inet.h>
-#include <linux/slab.h>
-#include <linux/crypto.h>
-#include <linux/if_vlan.h>
-#include <net/dst.h>
-#include <net/tcp.h>
-#include <scsi/scsi_cmnd.h>
-#include <scsi/scsi_device.h>
-#include <scsi/scsi_eh.h>
-#include <scsi/scsi_host.h>
-#include <scsi/scsi.h>
-#include <scsi/iscsi_proto.h>
-#include <scsi/libiscsi.h>
-#include <scsi/scsi_transport_iscsi.h>
-
-#include "cxgb3i.h"
-#include "cxgb3i_pdu.h"
-
-#ifdef __DEBUG_CXGB3I_TAG__
-#define cxgb3i_tag_debug cxgb3i_log_debug
-#else
-#define cxgb3i_tag_debug(fmt...)
-#endif
-
-#ifdef __DEBUG_CXGB3I_API__
-#define cxgb3i_api_debug cxgb3i_log_debug
-#else
-#define cxgb3i_api_debug(fmt...)
-#endif
-
-/*
- * align pdu size to multiple of 512 for better performance
- */
-#define align_pdu_size(n) do { n = (n) & (~511); } while (0)
-
-static struct scsi_transport_template *cxgb3i_scsi_transport;
-static struct scsi_host_template cxgb3i_host_template;
-static struct iscsi_transport cxgb3i_iscsi_transport;
-static unsigned char sw_tag_idx_bits;
-static unsigned char sw_tag_age_bits;
-
-static LIST_HEAD(cxgb3i_snic_list);
-static DEFINE_RWLOCK(cxgb3i_snic_rwlock);
-
-/**
- * cxgb3i_adpater_find_by_tdev - find the cxgb3i_adapter structure via t3cdev
- * @tdev: t3cdev pointer
- */
-struct cxgb3i_adapter *cxgb3i_adapter_find_by_tdev(struct t3cdev *tdev)
-{
- struct cxgb3i_adapter *snic;
-
- read_lock(&cxgb3i_snic_rwlock);
- list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
- if (snic->tdev == tdev) {
- read_unlock(&cxgb3i_snic_rwlock);
- return snic;
- }
- }
- read_unlock(&cxgb3i_snic_rwlock);
- return NULL;
-}
-
-static inline int adapter_update(struct cxgb3i_adapter *snic)
-{
- cxgb3i_log_info("snic 0x%p, t3dev 0x%p, updating.\n",
- snic, snic->tdev);
- return cxgb3i_adapter_ddp_info(snic->tdev, &snic->tag_format,
- &snic->tx_max_size,
- &snic->rx_max_size);
-}
-
-static int adapter_add(struct cxgb3i_adapter *snic)
-{
- struct t3cdev *t3dev = snic->tdev;
- struct adapter *adapter = tdev2adap(t3dev);
- int i, err;
-
- snic->pdev = adapter->pdev;
- snic->tag_format.sw_bits = sw_tag_idx_bits + sw_tag_age_bits;
-
- err = cxgb3i_adapter_ddp_info(t3dev, &snic->tag_format,
- &snic->tx_max_size,
- &snic->rx_max_size);
- if (err < 0)
- return err;
-
- for_each_port(adapter, i) {
- snic->hba[i] = cxgb3i_hba_host_add(snic, adapter->port[i]);
- if (!snic->hba[i])
- return -EINVAL;
- }
- snic->hba_cnt = adapter->params.nports;
-
- /* add to the list */
- write_lock(&cxgb3i_snic_rwlock);
- list_add_tail(&snic->list_head, &cxgb3i_snic_list);
- write_unlock(&cxgb3i_snic_rwlock);
-
- cxgb3i_log_info("t3dev 0x%p open, snic 0x%p, %u scsi hosts added.\n",
- t3dev, snic, snic->hba_cnt);
- return 0;
-}
-
-/**
- * cxgb3i_adapter_open - init a s3 adapter structure and any h/w settings
- * @t3dev: t3cdev adapter
- */
-void cxgb3i_adapter_open(struct t3cdev *t3dev)
-{
- struct cxgb3i_adapter *snic = cxgb3i_adapter_find_by_tdev(t3dev);
- int err;
-
- if (snic)
- err = adapter_update(snic);
- else {
- snic = kzalloc(sizeof(*snic), GFP_KERNEL);
- if (snic) {
- spin_lock_init(&snic->lock);
- snic->tdev = t3dev;
- err = adapter_add(snic);
- } else
- err = -ENOMEM;
- }
-
- if (err < 0) {
- cxgb3i_log_info("snic 0x%p, f 0x%x, t3dev 0x%p open, err %d.\n",
- snic, snic ? snic->flags : 0, t3dev, err);
- if (snic) {
- snic->flags &= ~CXGB3I_ADAPTER_FLAG_RESET;
- cxgb3i_adapter_close(t3dev);
- }
- }
-}
-
-/**
- * cxgb3i_adapter_close - release the resources held and cleanup h/w settings
- * @t3dev: t3cdev adapter
- */
-void cxgb3i_adapter_close(struct t3cdev *t3dev)
-{
- struct cxgb3i_adapter *snic = cxgb3i_adapter_find_by_tdev(t3dev);
- int i;
-
- if (!snic || snic->flags & CXGB3I_ADAPTER_FLAG_RESET) {
- cxgb3i_log_info("t3dev 0x%p close, snic 0x%p, f 0x%x.\n",
- t3dev, snic, snic ? snic->flags : 0);
- return;
- }
-
- /* remove from the list */
- write_lock(&cxgb3i_snic_rwlock);
- list_del(&snic->list_head);
- write_unlock(&cxgb3i_snic_rwlock);
-
- for (i = 0; i < snic->hba_cnt; i++) {
- if (snic->hba[i]) {
- cxgb3i_hba_host_remove(snic->hba[i]);
- snic->hba[i] = NULL;
- }
- }
- cxgb3i_log_info("t3dev 0x%p close, snic 0x%p, %u scsi hosts removed.\n",
- t3dev, snic, snic->hba_cnt);
- kfree(snic);
-}
-
-/**
- * cxgb3i_hba_find_by_netdev - find the cxgb3i_hba structure via net_device
- * @t3dev: t3cdev adapter
- */
-static struct cxgb3i_hba *cxgb3i_hba_find_by_netdev(struct net_device *ndev)
-{
- struct cxgb3i_adapter *snic;
- int i;
-
- if (ndev->priv_flags & IFF_802_1Q_VLAN)
- ndev = vlan_dev_real_dev(ndev);
-
- read_lock(&cxgb3i_snic_rwlock);
- list_for_each_entry(snic, &cxgb3i_snic_list, list_head) {
- for (i = 0; i < snic->hba_cnt; i++) {
- if (snic->hba[i]->ndev == ndev) {
- read_unlock(&cxgb3i_snic_rwlock);
- return snic->hba[i];
- }
- }
- }
- read_unlock(&cxgb3i_snic_rwlock);
- return NULL;
-}
-
-/**
- * cxgb3i_hba_host_add - register a new host with scsi/iscsi
- * @snic: the cxgb3i adapter
- * @ndev: associated net_device
- */
-struct cxgb3i_hba *cxgb3i_hba_host_add(struct cxgb3i_adapter *snic,
- struct net_device *ndev)
-{
- struct cxgb3i_hba *hba;
- struct Scsi_Host *shost;
- int err;
-
- shost = iscsi_host_alloc(&cxgb3i_host_template,
- sizeof(struct cxgb3i_hba), 1);
- if (!shost) {
- cxgb3i_log_info("snic 0x%p, ndev 0x%p, host_alloc failed.\n",
- snic, ndev);
- return NULL;
- }
-
- shost->transportt = cxgb3i_scsi_transport;
- shost->max_lun = CXGB3I_MAX_LUN;
- shost->max_id = CXGB3I_MAX_TARGET;
- shost->max_channel = 0;
- shost->max_cmd_len = 16;
-
- hba = iscsi_host_priv(shost);
- hba->snic = snic;
- hba->ndev = ndev;
- hba->shost = shost;
-
- pci_dev_get(snic->pdev);
- err = iscsi_host_add(shost, &snic->pdev->dev);
- if (err) {
- cxgb3i_log_info("snic 0x%p, ndev 0x%p, host_add failed.\n",
- snic, ndev);
- goto pci_dev_put;
- }
-
- cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n",
- shost, hba, shost->host_no);
-
- return hba;
-
-pci_dev_put:
- pci_dev_put(snic->pdev);
- scsi_host_put(shost);
- return NULL;
-}
-
-/**
- * cxgb3i_hba_host_remove - de-register the host with scsi/iscsi
- * @hba: the cxgb3i hba
- */
-void cxgb3i_hba_host_remove(struct cxgb3i_hba *hba)
-{
- cxgb3i_api_debug("shost 0x%p, hba 0x%p, no %u.\n",
- hba->shost, hba, hba->shost->host_no);
- iscsi_host_remove(hba->shost);
- pci_dev_put(hba->snic->pdev);
- iscsi_host_free(hba->shost);
-}
-
-/**
- * cxgb3i_ep_connect - establish TCP connection to target portal
- * @shost: scsi host to use
- * @dst_addr: target IP address
- * @non_blocking: blocking or non-blocking call
- *
- * Initiates a TCP/IP connection to the dst_addr
- */
-static struct iscsi_endpoint *cxgb3i_ep_connect(struct Scsi_Host *shost,
- struct sockaddr *dst_addr,
- int non_blocking)
-{
- struct iscsi_endpoint *ep;
- struct cxgb3i_endpoint *cep;
- struct cxgb3i_hba *hba = NULL;
- struct s3_conn *c3cn = NULL;
- int err = 0;
-
- if (shost)
- hba = iscsi_host_priv(shost);
-
- cxgb3i_api_debug("shost 0x%p, hba 0x%p.\n", shost, hba);
-
- c3cn = cxgb3i_c3cn_create();
- if (!c3cn) {
- cxgb3i_log_info("ep connect OOM.\n");
- err = -ENOMEM;
- goto release_conn;
- }
-
- err = cxgb3i_c3cn_connect(hba ? hba->ndev : NULL, c3cn,
- (struct sockaddr_in *)dst_addr);
- if (err < 0) {
- cxgb3i_log_info("ep connect failed.\n");
- goto release_conn;
- }
-
- hba = cxgb3i_hba_find_by_netdev(c3cn->dst_cache->dev);
- if (!hba) {
- err = -ENOSPC;
- cxgb3i_log_info("NOT going through cxgbi device.\n");
- goto release_conn;
- }
-
- if (shost && hba != iscsi_host_priv(shost)) {
- err = -ENOSPC;
- cxgb3i_log_info("Could not connect through request host%u\n",
- shost->host_no);
- goto release_conn;
- }
-
- if (c3cn_is_closing(c3cn)) {
- err = -ENOSPC;
- cxgb3i_log_info("ep connect unable to connect.\n");
- goto release_conn;
- }
-
- ep = iscsi_create_endpoint(sizeof(*cep));
- if (!ep) {
- err = -ENOMEM;
- cxgb3i_log_info("iscsi alloc ep, OOM.\n");
- goto release_conn;
- }
- cep = ep->dd_data;
- cep->c3cn = c3cn;
- cep->hba = hba;
-
- cxgb3i_api_debug("ep 0x%p, 0x%p, c3cn 0x%p, hba 0x%p.\n",
- ep, cep, c3cn, hba);
- return ep;
-
-release_conn:
- cxgb3i_api_debug("conn 0x%p failed, release.\n", c3cn);
- if (c3cn)
- cxgb3i_c3cn_release(c3cn);
- return ERR_PTR(err);
-}
-
-/**
- * cxgb3i_ep_poll - polls for TCP connection establishement
- * @ep: TCP connection (endpoint) handle
- * @timeout_ms: timeout value in milli secs
- *
- * polls for TCP connect request to complete
- */
-static int cxgb3i_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
-{
- struct cxgb3i_endpoint *cep = ep->dd_data;
- struct s3_conn *c3cn = cep->c3cn;
-
- if (!c3cn_is_established(c3cn))
- return 0;
- cxgb3i_api_debug("ep 0x%p, c3cn 0x%p established.\n", ep, c3cn);
- return 1;
-}
-
-/**
- * cxgb3i_ep_disconnect - teardown TCP connection
- * @ep: TCP connection (endpoint) handle
- *
- * teardown TCP connection
- */
-static void cxgb3i_ep_disconnect(struct iscsi_endpoint *ep)
-{
- struct cxgb3i_endpoint *cep = ep->dd_data;
- struct cxgb3i_conn *cconn = cep->cconn;
-
- cxgb3i_api_debug("ep 0x%p, cep 0x%p.\n", ep, cep);
-
- if (cconn && cconn->conn) {
- /*
- * stop the xmit path so the xmit_pdu function is
- * not being called
- */
- iscsi_suspend_tx(cconn->conn);
-
- write_lock_bh(&cep->c3cn->callback_lock);
- cep->c3cn->user_data = NULL;
- cconn->cep = NULL;
- write_unlock_bh(&cep->c3cn->callback_lock);
- }
-
- cxgb3i_api_debug("ep 0x%p, cep 0x%p, release c3cn 0x%p.\n",
- ep, cep, cep->c3cn);
- cxgb3i_c3cn_release(cep->c3cn);
- iscsi_destroy_endpoint(ep);
-}
-
-/**
- * cxgb3i_session_create - create a new iscsi session
- * @cmds_max: max # of commands
- * @qdepth: scsi queue depth
- * @initial_cmdsn: initial iscsi CMDSN for this session
- *
- * Creates a new iSCSI session
- */
-static struct iscsi_cls_session *
-cxgb3i_session_create(struct iscsi_endpoint *ep, u16 cmds_max, u16 qdepth,
- u32 initial_cmdsn)
-{
- struct cxgb3i_endpoint *cep;
- struct cxgb3i_hba *hba;
- struct Scsi_Host *shost;
- struct iscsi_cls_session *cls_session;
- struct iscsi_session *session;
-
- if (!ep) {
- cxgb3i_log_error("%s, missing endpoint.\n", __func__);
- return NULL;
- }
-
- cep = ep->dd_data;
- hba = cep->hba;
- shost = hba->shost;
- cxgb3i_api_debug("ep 0x%p, cep 0x%p, hba 0x%p.\n", ep, cep, hba);
- BUG_ON(hba != iscsi_host_priv(shost));
-
- cls_session = iscsi_session_setup(&cxgb3i_iscsi_transport, shost,
- cmds_max, 0,
- sizeof(struct iscsi_tcp_task) +
- sizeof(struct cxgb3i_task_data),
- initial_cmdsn, ISCSI_MAX_TARGET);
- if (!cls_session)
- return NULL;
- session = cls_session->dd_data;
- if (iscsi_tcp_r2tpool_alloc(session))
- goto remove_session;
-
- return cls_session;
-
-remove_session:
- iscsi_session_teardown(cls_session);
- return NULL;
-}
-
-/**
- * cxgb3i_session_destroy - destroys iscsi session
- * @cls_session: pointer to iscsi cls session
- *
- * Destroys an iSCSI session instance and releases its all resources held
- */
-static void cxgb3i_session_destroy(struct iscsi_cls_session *cls_session)
-{
- cxgb3i_api_debug("sess 0x%p.\n", cls_session);
- iscsi_tcp_r2tpool_free(cls_session->dd_data);
- iscsi_session_teardown(cls_session);
-}
-
-/**
- * cxgb3i_conn_max_xmit_dlength -- calc the max. xmit pdu segment size
- * @conn: iscsi connection
- * check the max. xmit pdu payload, reduce it if needed
- */
-static inline int cxgb3i_conn_max_xmit_dlength(struct iscsi_conn *conn)
-
-{
- struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- struct cxgb3i_conn *cconn = tcp_conn->dd_data;
- unsigned int max = max(512 * MAX_SKB_FRAGS, SKB_TX_HEADROOM);
-
- max = min(cconn->hba->snic->tx_max_size, max);
- if (conn->max_xmit_dlength)
- conn->max_xmit_dlength = min(conn->max_xmit_dlength, max);
- else
- conn->max_xmit_dlength = max;
- align_pdu_size(conn->max_xmit_dlength);
- cxgb3i_api_debug("conn 0x%p, max xmit %u.\n",
- conn, conn->max_xmit_dlength);
- return 0;
-}
-
-/**
- * cxgb3i_conn_max_recv_dlength -- check the max. recv pdu segment size
- * @conn: iscsi connection
- * return 0 if the value is valid, < 0 otherwise.
- */
-static inline int cxgb3i_conn_max_recv_dlength(struct iscsi_conn *conn)
-{
- struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- struct cxgb3i_conn *cconn = tcp_conn->dd_data;
- unsigned int max = cconn->hba->snic->rx_max_size;
-
- align_pdu_size(max);
- if (conn->max_recv_dlength) {
- if (conn->max_recv_dlength > max) {
- cxgb3i_log_error("MaxRecvDataSegmentLength %u too big."
- " Need to be <= %u.\n",
- conn->max_recv_dlength, max);
- return -EINVAL;
- }
- conn->max_recv_dlength = min(conn->max_recv_dlength, max);
- align_pdu_size(conn->max_recv_dlength);
- } else
- conn->max_recv_dlength = max;
- cxgb3i_api_debug("conn 0x%p, max recv %u.\n",
- conn, conn->max_recv_dlength);
- return 0;
-}
-
-/**
- * cxgb3i_conn_create - create iscsi connection instance
- * @cls_session: pointer to iscsi cls session
- * @cid: iscsi cid
- *
- * Creates a new iSCSI connection instance for a given session
- */
-static struct iscsi_cls_conn *cxgb3i_conn_create(struct iscsi_cls_session
- *cls_session, u32 cid)
-{
- struct iscsi_cls_conn *cls_conn;
- struct iscsi_conn *conn;
- struct iscsi_tcp_conn *tcp_conn;
- struct cxgb3i_conn *cconn;
-
- cxgb3i_api_debug("sess 0x%p, cid %u.\n", cls_session, cid);
-
- cls_conn = iscsi_tcp_conn_setup(cls_session, sizeof(*cconn), cid);
- if (!cls_conn)
- return NULL;
- conn = cls_conn->dd_data;
- tcp_conn = conn->dd_data;
- cconn = tcp_conn->dd_data;
-
- cconn->conn = conn;
- return cls_conn;
-}
-
-/**
- * cxgb3i_conn_bind - binds iscsi sess, conn and endpoint together
- * @cls_session: pointer to iscsi cls session
- * @cls_conn: pointer to iscsi cls conn
- * @transport_eph: 64-bit EP handle
- * @is_leading: leading connection on this session?
- *
- * Binds together an iSCSI session, an iSCSI connection and a
- * TCP connection. This routine returns error code if the TCP
- * connection does not belong on the device iSCSI sess/conn is bound
- */
-
-static int cxgb3i_conn_bind(struct iscsi_cls_session *cls_session,
- struct iscsi_cls_conn *cls_conn,
- u64 transport_eph, int is_leading)
-{
- struct iscsi_conn *conn = cls_conn->dd_data;
- struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- struct cxgb3i_conn *cconn = tcp_conn->dd_data;
- struct cxgb3i_adapter *snic;
- struct iscsi_endpoint *ep;
- struct cxgb3i_endpoint *cep;
- struct s3_conn *c3cn;
- int err;
-
- ep = iscsi_lookup_endpoint(transport_eph);
- if (!ep)
- return -EINVAL;
-
- /* setup ddp pagesize */
- cep = ep->dd_data;
- c3cn = cep->c3cn;
- snic = cep->hba->snic;
- err = cxgb3i_setup_conn_host_pagesize(snic->tdev, c3cn->tid, 0);
- if (err < 0)
- return err;
-
- cxgb3i_api_debug("ep 0x%p, cls sess 0x%p, cls conn 0x%p.\n",
- ep, cls_session, cls_conn);
-
- err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
- if (err)
- return -EINVAL;
-
- /* calculate the tag idx bits needed for this conn based on cmds_max */
- cconn->task_idx_bits = (__ilog2_u32(conn->session->cmds_max - 1)) + 1;
- cxgb3i_api_debug("session cmds_max 0x%x, bits %u.\n",
- conn->session->cmds_max, cconn->task_idx_bits);
-
- read_lock(&c3cn->callback_lock);
- c3cn->user_data = conn;
- cconn->hba = cep->hba;
- cconn->cep = cep;
- cep->cconn = cconn;
- read_unlock(&c3cn->callback_lock);
-
- cxgb3i_conn_max_xmit_dlength(conn);
- cxgb3i_conn_max_recv_dlength(conn);
-
- spin_lock_bh(&conn->session->lock);
- sprintf(conn->portal_address, "%pI4", &c3cn->daddr.sin_addr.s_addr);
- conn->portal_port = ntohs(c3cn->daddr.sin_port);
- spin_unlock_bh(&conn->session->lock);
-
- /* init recv engine */
- iscsi_tcp_hdr_recv_prep(tcp_conn);
-
- return 0;
-}
-
-/**
- * cxgb3i_conn_get_param - return iscsi connection parameter to caller
- * @cls_conn: pointer to iscsi cls conn
- * @param: parameter type identifier
- * @buf: buffer pointer
- *
- * returns iSCSI connection parameters
- */
-static int cxgb3i_conn_get_param(struct iscsi_cls_conn *cls_conn,
- enum iscsi_param param, char *buf)
-{
- struct iscsi_conn *conn = cls_conn->dd_data;
- int len;
-
- cxgb3i_api_debug("cls_conn 0x%p, param %d.\n", cls_conn, param);
-
- switch (param) {
- case ISCSI_PARAM_CONN_PORT:
- spin_lock_bh(&conn->session->lock);
- len = sprintf(buf, "%hu\n", conn->portal_port);
- spin_unlock_bh(&conn->session->lock);
- break;
- case ISCSI_PARAM_CONN_ADDRESS:
- spin_lock_bh(&conn->session->lock);
- len = sprintf(buf, "%s\n", conn->portal_address);
- spin_unlock_bh(&conn->session->lock);
- break;
- default:
- return iscsi_conn_get_param(cls_conn, param, buf);
- }
-
- return len;
-}
-
-/**
- * cxgb3i_conn_set_param - set iscsi connection parameter
- * @cls_conn: pointer to iscsi cls conn
- * @param: parameter type identifier
- * @buf: buffer pointer
- * @buflen: buffer length
- *
- * set iSCSI connection parameters
- */
-static int cxgb3i_conn_set_param(struct iscsi_cls_conn *cls_conn,
- enum iscsi_param param, char *buf, int buflen)
-{
- struct iscsi_conn *conn = cls_conn->dd_data;
- struct iscsi_session *session = conn->session;
- struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- struct cxgb3i_conn *cconn = tcp_conn->dd_data;
- struct cxgb3i_adapter *snic = cconn->hba->snic;
- struct s3_conn *c3cn = cconn->cep->c3cn;
- int value, err = 0;
-
- switch (param) {
- case ISCSI_PARAM_HDRDGST_EN:
- err = iscsi_set_param(cls_conn, param, buf, buflen);
- if (!err && conn->hdrdgst_en)
- err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid,
- conn->hdrdgst_en,
- conn->datadgst_en, 0);
- break;
- case ISCSI_PARAM_DATADGST_EN:
- err = iscsi_set_param(cls_conn, param, buf, buflen);
- if (!err && conn->datadgst_en)
- err = cxgb3i_setup_conn_digest(snic->tdev, c3cn->tid,
- conn->hdrdgst_en,
- conn->datadgst_en, 0);
- break;
- case ISCSI_PARAM_MAX_R2T:
- sscanf(buf, "%d", &value);
- if (value <= 0 || !is_power_of_2(value))
- return -EINVAL;
- if (session->max_r2t == value)
- break;
- iscsi_tcp_r2tpool_free(session);
- err = iscsi_set_param(cls_conn, param, buf, buflen);
- if (!err && iscsi_tcp_r2tpool_alloc(session))
- return -ENOMEM;
- case ISCSI_PARAM_MAX_RECV_DLENGTH:
- err = iscsi_set_param(cls_conn, param, buf, buflen);
- if (!err)
- err = cxgb3i_conn_max_recv_dlength(conn);
- break;
- case ISCSI_PARAM_MAX_XMIT_DLENGTH:
- err = iscsi_set_param(cls_conn, param, buf, buflen);
- if (!err)
- err = cxgb3i_conn_max_xmit_dlength(conn);
- break;
- default:
- return iscsi_set_param(cls_conn, param, buf, buflen);
- }
- return err;
-}
-
-/**
- * cxgb3i_host_set_param - configure host (adapter) related parameters
- * @shost: scsi host pointer
- * @param: parameter type identifier
- * @buf: buffer pointer
- */
-static int cxgb3i_host_set_param(struct Scsi_Host *shost,
- enum iscsi_host_param param,
- char *buf, int buflen)
-{
- struct cxgb3i_hba *hba = iscsi_host_priv(shost);
-
- if (!hba->ndev) {
- shost_printk(KERN_ERR, shost, "Could not set host param. "
- "Netdev for host not set.\n");
- return -ENODEV;
- }
-
- cxgb3i_api_debug("param %d, buf %s.\n", param, buf);
-
- switch (param) {
- case ISCSI_HOST_PARAM_IPADDRESS:
- {
- __be32 addr = in_aton(buf);
- cxgb3i_set_private_ipv4addr(hba->ndev, addr);
- return 0;
- }
- case ISCSI_HOST_PARAM_HWADDRESS:
- case ISCSI_HOST_PARAM_NETDEV_NAME:
- /* ignore */
- return 0;
- default:
- return iscsi_host_set_param(shost, param, buf, buflen);
- }
-}
-
-/**
- * cxgb3i_host_get_param - returns host (adapter) related parameters
- * @shost: scsi host pointer
- * @param: parameter type identifier
- * @buf: buffer pointer
- */
-static int cxgb3i_host_get_param(struct Scsi_Host *shost,
- enum iscsi_host_param param, char *buf)
-{
- struct cxgb3i_hba *hba = iscsi_host_priv(shost);
- int len = 0;
-
- if (!hba->ndev) {
- shost_printk(KERN_ERR, shost, "Could not set host param. "
- "Netdev for host not set.\n");
- return -ENODEV;
- }
-
- cxgb3i_api_debug("hba %s, param %d.\n", hba->ndev->name, param);
-
- switch (param) {
- case ISCSI_HOST_PARAM_HWADDRESS:
- len = sysfs_format_mac(buf, hba->ndev->dev_addr, 6);
- break;
- case ISCSI_HOST_PARAM_NETDEV_NAME:
- len = sprintf(buf, "%s\n", hba->ndev->name);
- break;
- case ISCSI_HOST_PARAM_IPADDRESS:
- {
- __be32 addr;
-
- addr = cxgb3i_get_private_ipv4addr(hba->ndev);
- len = sprintf(buf, "%pI4", &addr);
- break;
- }
- default:
- return iscsi_host_get_param(shost, param, buf);
- }
- return len;
-}
-
-/**
- * cxgb3i_conn_get_stats - returns iSCSI stats
- * @cls_conn: pointer to iscsi cls conn
- * @stats: pointer to iscsi statistic struct
- */
-static void cxgb3i_conn_get_stats(struct iscsi_cls_conn *cls_conn,
- struct iscsi_stats *stats)
-{
- struct iscsi_conn *conn = cls_conn->dd_data;
-
- stats->txdata_octets = conn->txdata_octets;
- stats->rxdata_octets = conn->rxdata_octets;
- stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
- stats->dataout_pdus = conn->dataout_pdus_cnt;
- stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
- stats->datain_pdus = conn->datain_pdus_cnt;
- stats->r2t_pdus = conn->r2t_pdus_cnt;
- stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
- stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
- stats->digest_err = 0;
- stats->timeout_err = 0;
- stats->custom_length = 1;
- strcpy(stats->custom[0].desc, "eh_abort_cnt");
- stats->custom[0].value = conn->eh_abort_cnt;
-}
-
-/**
- * cxgb3i_parse_itt - get the idx and age bits from a given tag
- * @conn: iscsi connection
- * @itt: itt tag
- * @idx: task index, filled in by this function
- * @age: session age, filled in by this function
- */
-static void cxgb3i_parse_itt(struct iscsi_conn *conn, itt_t itt,
- int *idx, int *age)
-{
- struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- struct cxgb3i_conn *cconn = tcp_conn->dd_data;
- struct cxgb3i_adapter *snic = cconn->hba->snic;
- u32 tag = ntohl((__force u32) itt);
- u32 sw_bits;
-
- sw_bits = cxgb3i_tag_nonrsvd_bits(&snic->tag_format, tag);
- if (idx)
- *idx = sw_bits & ((1 << cconn->task_idx_bits) - 1);
- if (age)
- *age = (sw_bits >> cconn->task_idx_bits) & ISCSI_AGE_MASK;
-
- cxgb3i_tag_debug("parse tag 0x%x/0x%x, sw 0x%x, itt 0x%x, age 0x%x.\n",
- tag, itt, sw_bits, idx ? *idx : 0xFFFFF,
- age ? *age : 0xFF);
-}
-
-/**
- * cxgb3i_reserve_itt - generate tag for a give task
- * @task: iscsi task
- * @hdr_itt: tag, filled in by this function
- * Set up ddp for scsi read tasks if possible.
- */
-int cxgb3i_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt)
-{
- struct scsi_cmnd *sc = task->sc;
- struct iscsi_conn *conn = task->conn;
- struct iscsi_session *sess = conn->session;
- struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- struct cxgb3i_conn *cconn = tcp_conn->dd_data;
- struct cxgb3i_adapter *snic = cconn->hba->snic;
- struct cxgb3i_tag_format *tformat = &snic->tag_format;
- u32 sw_tag = (sess->age << cconn->task_idx_bits) | task->itt;
- u32 tag;
- int err = -EINVAL;
-
- if (sc &&
- (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
- cxgb3i_sw_tag_usable(tformat, sw_tag)) {
- struct s3_conn *c3cn = cconn->cep->c3cn;
- struct cxgb3i_gather_list *gl;
-
- gl = cxgb3i_ddp_make_gl(scsi_in(sc)->length,
- scsi_in(sc)->table.sgl,
- scsi_in(sc)->table.nents,
- snic->pdev,
- GFP_ATOMIC);
- if (gl) {
- tag = sw_tag;
- err = cxgb3i_ddp_tag_reserve(snic->tdev, c3cn->tid,
- tformat, &tag,
- gl, GFP_ATOMIC);
- if (err < 0)
- cxgb3i_ddp_release_gl(gl, snic->pdev);
- }
- }
-
- if (err < 0)
- tag = cxgb3i_set_non_ddp_tag(tformat, sw_tag);
- /* the itt need to sent in big-endian order */
- *hdr_itt = (__force itt_t)htonl(tag);
-
- cxgb3i_tag_debug("new tag 0x%x/0x%x (itt 0x%x, age 0x%x).\n",
- tag, *hdr_itt, task->itt, sess->age);
- return 0;
-}
-
-/**
- * cxgb3i_release_itt - release the tag for a given task
- * @task: iscsi task
- * @hdr_itt: tag
- * If the tag is a ddp tag, release the ddp setup
- */
-void cxgb3i_release_itt(struct iscsi_task *task, itt_t hdr_itt)
-{
- struct scsi_cmnd *sc = task->sc;
- struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
- struct cxgb3i_conn *cconn = tcp_conn->dd_data;
- struct cxgb3i_adapter *snic = cconn->hba->snic;
- struct cxgb3i_tag_format *tformat = &snic->tag_format;
- u32 tag = ntohl((__force u32)hdr_itt);
-
- cxgb3i_tag_debug("release tag 0x%x.\n", tag);
-
- if (sc &&
- (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_FROM_DEVICE) &&
- cxgb3i_is_ddp_tag(tformat, tag))
- cxgb3i_ddp_tag_release(snic->tdev, tag);
-}
-
-/**
- * cxgb3i_host_template -- Scsi_Host_Template structure
- * used when registering with the scsi mid layer
- */
-static struct scsi_host_template cxgb3i_host_template = {
- .module = THIS_MODULE,
- .name = "Chelsio S3xx iSCSI Initiator",
- .proc_name = "cxgb3i",
- .queuecommand = iscsi_queuecommand,
- .change_queue_depth = iscsi_change_queue_depth,
- .can_queue = CXGB3I_SCSI_HOST_QDEPTH,
- .sg_tablesize = SG_ALL,
- .max_sectors = 0xFFFF,
- .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
- .eh_abort_handler = iscsi_eh_abort,
- .eh_device_reset_handler = iscsi_eh_device_reset,
- .eh_target_reset_handler = iscsi_eh_recover_target,
- .target_alloc = iscsi_target_alloc,
- .use_clustering = DISABLE_CLUSTERING,
- .this_id = -1,
-};
-
-static struct iscsi_transport cxgb3i_iscsi_transport = {
- .owner = THIS_MODULE,
- .name = "cxgb3i",
- .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
- | CAP_DATADGST | CAP_DIGEST_OFFLOAD |
- CAP_PADDING_OFFLOAD,
- .param_mask = ISCSI_MAX_RECV_DLENGTH |
- ISCSI_MAX_XMIT_DLENGTH |
- ISCSI_HDRDGST_EN |
- ISCSI_DATADGST_EN |
- ISCSI_INITIAL_R2T_EN |
- ISCSI_MAX_R2T |
- ISCSI_IMM_DATA_EN |
- ISCSI_FIRST_BURST |
- ISCSI_MAX_BURST |
- ISCSI_PDU_INORDER_EN |
- ISCSI_DATASEQ_INORDER_EN |
- ISCSI_ERL |
- ISCSI_CONN_PORT |
- ISCSI_CONN_ADDRESS |
- ISCSI_EXP_STATSN |
- ISCSI_PERSISTENT_PORT |
- ISCSI_PERSISTENT_ADDRESS |
- ISCSI_TARGET_NAME | ISCSI_TPGT |
- ISCSI_USERNAME | ISCSI_PASSWORD |
- ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
- ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
- ISCSI_LU_RESET_TMO | ISCSI_TGT_RESET_TMO |
- ISCSI_PING_TMO | ISCSI_RECV_TMO |
- ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
- .host_param_mask = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
- ISCSI_HOST_INITIATOR_NAME | ISCSI_HOST_NETDEV_NAME,
- .get_host_param = cxgb3i_host_get_param,
- .set_host_param = cxgb3i_host_set_param,
- /* session management */
- .create_session = cxgb3i_session_create,
- .destroy_session = cxgb3i_session_destroy,
- .get_session_param = iscsi_session_get_param,
- /* connection management */
- .create_conn = cxgb3i_conn_create,
- .bind_conn = cxgb3i_conn_bind,
- .destroy_conn = iscsi_tcp_conn_teardown,
- .start_conn = iscsi_conn_start,
- .stop_conn = iscsi_conn_stop,
- .get_conn_param = cxgb3i_conn_get_param,
- .set_param = cxgb3i_conn_set_param,
- .get_stats = cxgb3i_conn_get_stats,
- /* pdu xmit req. from user space */
- .send_pdu = iscsi_conn_send_pdu,
- /* task */
- .init_task = iscsi_tcp_task_init,
- .xmit_task = iscsi_tcp_task_xmit,
- .cleanup_task = cxgb3i_conn_cleanup_task,
-
- /* pdu */
- .alloc_pdu = cxgb3i_conn_alloc_pdu,
- .init_pdu = cxgb3i_conn_init_pdu,
- .xmit_pdu = cxgb3i_conn_xmit_pdu,
- .parse_pdu_itt = cxgb3i_parse_itt,
-
- /* TCP connect/disconnect */
- .ep_connect = cxgb3i_ep_connect,
- .ep_poll = cxgb3i_ep_poll,
- .ep_disconnect = cxgb3i_ep_disconnect,
- /* Error recovery timeout call */
- .session_recovery_timedout = iscsi_session_recovery_timedout,
-};
-
-int cxgb3i_iscsi_init(void)
-{
- sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;
- sw_tag_age_bits = (__ilog2_u32(ISCSI_AGE_MASK)) + 1;
- cxgb3i_log_info("tag itt 0x%x, %u bits, age 0x%x, %u bits.\n",
- ISCSI_ITT_MASK, sw_tag_idx_bits,
- ISCSI_AGE_MASK, sw_tag_age_bits);
-
- cxgb3i_scsi_transport =
- iscsi_register_transport(&cxgb3i_iscsi_transport);
- if (!cxgb3i_scsi_transport) {
- cxgb3i_log_error("Could not register cxgb3i transport.\n");
- return -ENODEV;
- }
- cxgb3i_api_debug("cxgb3i transport 0x%p.\n", cxgb3i_scsi_transport);
- return 0;
-}
-
-void cxgb3i_iscsi_cleanup(void)
-{
- if (cxgb3i_scsi_transport) {
- cxgb3i_api_debug("cxgb3i transport 0x%p.\n",
- cxgb3i_scsi_transport);
- iscsi_unregister_transport(&cxgb3i_iscsi_transport);
- }
-}
+++ /dev/null
-/*
- * cxgb3i_offload.c: Chelsio S3xx iscsi offloaded tcp connection management
- *
- * Copyright (C) 2003-2008 Chelsio Communications. All rights reserved.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the LICENSE file included in this
- * release for licensing terms and conditions.
- *
- * Written by: Dimitris Michailidis (dm@chelsio.com)
- * Karen Xie (kxie@chelsio.com)
- */
-
-#include <linux/if_vlan.h>
-#include <linux/slab.h>
-#include <linux/version.h>
-
-#include "cxgb3_defs.h"
-#include "cxgb3_ctl_defs.h"
-#include "firmware_exports.h"
-#include "cxgb3i_offload.h"
-#include "cxgb3i_pdu.h"
-#include "cxgb3i_ddp.h"
-
-#ifdef __DEBUG_C3CN_CONN__
-#define c3cn_conn_debug cxgb3i_log_debug
-#else
-#define c3cn_conn_debug(fmt...)
-#endif
-
-#ifdef __DEBUG_C3CN_TX__
-#define c3cn_tx_debug cxgb3i_log_debug
-#else
-#define c3cn_tx_debug(fmt...)
-#endif
-
-#ifdef __DEBUG_C3CN_RX__
-#define c3cn_rx_debug cxgb3i_log_debug
-#else
-#define c3cn_rx_debug(fmt...)
-#endif
-
-/*
- * module parameters releated to offloaded iscsi connection
- */
-static int cxgb3_rcv_win = 256 * 1024;
-module_param(cxgb3_rcv_win, int, 0644);
-MODULE_PARM_DESC(cxgb3_rcv_win, "TCP receive window in bytes (default=256KB)");
-
-static int cxgb3_snd_win = 128 * 1024;
-module_param(cxgb3_snd_win, int, 0644);
-MODULE_PARM_DESC(cxgb3_snd_win, "TCP send window in bytes (default=128KB)");
-
-static int cxgb3_rx_credit_thres = 10 * 1024;
-module_param(cxgb3_rx_credit_thres, int, 0644);
-MODULE_PARM_DESC(rx_credit_thres,
- "RX credits return threshold in bytes (default=10KB)");
-
-static unsigned int cxgb3_max_connect = 8 * 1024;
-module_param(cxgb3_max_connect, uint, 0644);
-MODULE_PARM_DESC(cxgb3_max_connect, "Max. # of connections (default=8092)");
-
-static unsigned int cxgb3_sport_base = 20000;
-module_param(cxgb3_sport_base, uint, 0644);
-MODULE_PARM_DESC(cxgb3_sport_base, "starting port number (default=20000)");
-
-/*
- * cxgb3i tcp connection data(per adapter) list
- */
-static LIST_HEAD(cdata_list);
-static DEFINE_RWLOCK(cdata_rwlock);
-
-static int c3cn_push_tx_frames(struct s3_conn *c3cn, int req_completion);
-static void c3cn_release_offload_resources(struct s3_conn *c3cn);
-
-/*
- * iscsi source port management
- *
- * Find a free source port in the port allocation map. We use a very simple
- * rotor scheme to look for the next free port.
- *
- * If a source port has been specified make sure that it doesn't collide with
- * our normal source port allocation map. If it's outside the range of our
- * allocation/deallocation scheme just let them use it.
- *
- * If the source port is outside our allocation range, the caller is
- * responsible for keeping track of their port usage.
- */
-static int c3cn_get_port(struct s3_conn *c3cn, struct cxgb3i_sdev_data *cdata)
-{
- unsigned int start;
- int idx;
-
- if (!cdata)
- goto error_out;
-
- if (c3cn->saddr.sin_port) {
- cxgb3i_log_error("connect, sin_port NON-ZERO %u.\n",
- c3cn->saddr.sin_port);
- return -EADDRINUSE;
- }
-
- spin_lock_bh(&cdata->lock);
- start = idx = cdata->sport_next;
- do {
- if (++idx >= cxgb3_max_connect)
- idx = 0;
- if (!cdata->sport_conn[idx]) {
- c3cn->saddr.sin_port = htons(cxgb3_sport_base + idx);
- cdata->sport_next = idx;
- cdata->sport_conn[idx] = c3cn;
- spin_unlock_bh(&cdata->lock);
-
- c3cn_conn_debug("%s reserve port %u.\n",
- cdata->cdev->name,
- cxgb3_sport_base + idx);
- return 0;
- }
- } while (idx != start);
- spin_unlock_bh(&cdata->lock);
-
-error_out:
- return -EADDRNOTAVAIL;
-}
-
-static void c3cn_put_port(struct s3_conn *c3cn)
-{
- if (!c3cn->cdev)
- return;
-
- if (c3cn->saddr.sin_port) {
- struct cxgb3i_sdev_data *cdata = CXGB3_SDEV_DATA(c3cn->cdev);
- int idx = ntohs(c3cn->saddr.sin_port) - cxgb3_sport_base;
-
- c3cn->saddr.sin_port = 0;
- if (idx < 0 || idx >= cxgb3_max_connect)
- return;
- spin_lock_bh(&cdata->lock);
- cdata->sport_conn[idx] = NULL;
- spin_unlock_bh(&cdata->lock);
- c3cn_conn_debug("%s, release port %u.\n",
- cdata->cdev->name, cxgb3_sport_base + idx);
- }
-}
-
-static inline void c3cn_set_flag(struct s3_conn *c3cn, enum c3cn_flags flag)
-{
- __set_bit(flag, &c3cn->flags);
- c3cn_conn_debug("c3cn 0x%p, set %d, s %u, f 0x%lx.\n",
- c3cn, flag, c3cn->state, c3cn->flags);
-}
-
-static inline void c3cn_clear_flag(struct s3_conn *c3cn, enum c3cn_flags flag)
-{
- __clear_bit(flag, &c3cn->flags);
- c3cn_conn_debug("c3cn 0x%p, clear %d, s %u, f 0x%lx.\n",
- c3cn, flag, c3cn->state, c3cn->flags);
-}
-
-static inline int c3cn_flag(struct s3_conn *c3cn, enum c3cn_flags flag)
-{
- if (c3cn == NULL)
- return 0;
- return test_bit(flag, &c3cn->flags);
-}
-
-static void c3cn_set_state(struct s3_conn *c3cn, int state)
-{
- c3cn_conn_debug("c3cn 0x%p state -> %u.\n", c3cn, state);
- c3cn->state = state;
-}
-
-static inline void c3cn_hold(struct s3_conn *c3cn)
-{
- atomic_inc(&c3cn->refcnt);
-}
-
-static inline void c3cn_put(struct s3_conn *c3cn)
-{
- if (atomic_dec_and_test(&c3cn->refcnt)) {
- c3cn_conn_debug("free c3cn 0x%p, s %u, f 0x%lx.\n",
- c3cn, c3cn->state, c3cn->flags);
- kfree(c3cn);
- }
-}
-
-static void c3cn_closed(struct s3_conn *c3cn)
-{
- c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
- c3cn, c3cn->state, c3cn->flags);
-
- c3cn_put_port(c3cn);
- c3cn_release_offload_resources(c3cn);
- c3cn_set_state(c3cn, C3CN_STATE_CLOSED);
- cxgb3i_conn_closing(c3cn);
-}
-
-/*
- * CPL (Chelsio Protocol Language) defines a message passing interface between
- * the host driver and T3 asic.
- * The section below implments CPLs that related to iscsi tcp connection
- * open/close/abort and data send/receive.
- */
-
-/*
- * CPL connection active open request: host ->
- */
-static unsigned int find_best_mtu(const struct t3c_data *d, unsigned short mtu)
-{
- int i = 0;
-
- while (i < d->nmtus - 1 && d->mtus[i + 1] <= mtu)
- ++i;
- return i;
-}
-
-static unsigned int select_mss(struct s3_conn *c3cn, unsigned int pmtu)
-{
- unsigned int idx;
- struct dst_entry *dst = c3cn->dst_cache;
- struct t3cdev *cdev = c3cn->cdev;
- const struct t3c_data *td = T3C_DATA(cdev);
- u16 advmss = dst_metric(dst, RTAX_ADVMSS);
-
- if (advmss > pmtu - 40)
- advmss = pmtu - 40;
- if (advmss < td->mtus[0] - 40)
- advmss = td->mtus[0] - 40;
- idx = find_best_mtu(td, advmss + 40);
- return idx;
-}
-
-static inline int compute_wscale(int win)
-{
- int wscale = 0;
- while (wscale < 14 && (65535<<wscale) < win)
- wscale++;
- return wscale;
-}
-
-static inline unsigned int calc_opt0h(struct s3_conn *c3cn)
-{
- int wscale = compute_wscale(cxgb3_rcv_win);
- return V_KEEP_ALIVE(1) |
- F_TCAM_BYPASS |
- V_WND_SCALE(wscale) |
- V_MSS_IDX(c3cn->mss_idx);
-}
-
-static inline unsigned int calc_opt0l(struct s3_conn *c3cn)
-{
- return V_ULP_MODE(ULP_MODE_ISCSI) |
- V_RCV_BUFSIZ(cxgb3_rcv_win>>10);
-}
-
-static void make_act_open_req(struct s3_conn *c3cn, struct sk_buff *skb,
- unsigned int atid, const struct l2t_entry *e)
-{
- struct cpl_act_open_req *req;
-
- c3cn_conn_debug("c3cn 0x%p, atid 0x%x.\n", c3cn, atid);
-
- skb->priority = CPL_PRIORITY_SETUP;
- req = (struct cpl_act_open_req *)__skb_put(skb, sizeof(*req));
- req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
- req->wr.wr_lo = 0;
- OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ACT_OPEN_REQ, atid));
- req->local_port = c3cn->saddr.sin_port;
- req->peer_port = c3cn->daddr.sin_port;
- req->local_ip = c3cn->saddr.sin_addr.s_addr;
- req->peer_ip = c3cn->daddr.sin_addr.s_addr;
- req->opt0h = htonl(calc_opt0h(c3cn) | V_L2T_IDX(e->idx) |
- V_TX_CHANNEL(e->smt_idx));
- req->opt0l = htonl(calc_opt0l(c3cn));
- req->params = 0;
- req->opt2 = 0;
-}
-
-static void fail_act_open(struct s3_conn *c3cn, int errno)
-{
- c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
- c3cn, c3cn->state, c3cn->flags);
- c3cn->err = errno;
- c3cn_closed(c3cn);
-}
-
-static void act_open_req_arp_failure(struct t3cdev *dev, struct sk_buff *skb)
-{
- struct s3_conn *c3cn = (struct s3_conn *)skb->sk;
-
- c3cn_conn_debug("c3cn 0x%p, state %u.\n", c3cn, c3cn->state);
-
- c3cn_hold(c3cn);
- spin_lock_bh(&c3cn->lock);
- if (c3cn->state == C3CN_STATE_CONNECTING)
- fail_act_open(c3cn, -EHOSTUNREACH);
- spin_unlock_bh(&c3cn->lock);
- c3cn_put(c3cn);
- __kfree_skb(skb);
-}
-
-/*
- * CPL connection close request: host ->
- *
- * Close a connection by sending a CPL_CLOSE_CON_REQ message and queue it to
- * the write queue (i.e., after any unsent txt data).
- */
-static void skb_entail(struct s3_conn *c3cn, struct sk_buff *skb,
- int flags)
-{
- skb_tcp_seq(skb) = c3cn->write_seq;
- skb_flags(skb) = flags;
- __skb_queue_tail(&c3cn->write_queue, skb);
-}
-
-static void send_close_req(struct s3_conn *c3cn)
-{
- struct sk_buff *skb = c3cn->cpl_close;
- struct cpl_close_con_req *req = (struct cpl_close_con_req *)skb->head;
- unsigned int tid = c3cn->tid;
-
- c3cn_conn_debug("c3cn 0x%p, state 0x%x, flag 0x%lx.\n",
- c3cn, c3cn->state, c3cn->flags);
-
- c3cn->cpl_close = NULL;
-
- req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_CLOSE_CON));
- req->wr.wr_lo = htonl(V_WR_TID(tid));
- OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, tid));
- req->rsvd = htonl(c3cn->write_seq);
-
- skb_entail(c3cn, skb, C3CB_FLAG_NO_APPEND);
- if (c3cn->state != C3CN_STATE_CONNECTING)
- c3cn_push_tx_frames(c3cn, 1);
-}
-
-/*
- * CPL connection abort request: host ->
- *
- * Send an ABORT_REQ message. Makes sure we do not send multiple ABORT_REQs
- * for the same connection and also that we do not try to send a message
- * after the connection has closed.
- */
-static void abort_arp_failure(struct t3cdev *cdev, struct sk_buff *skb)
-{
- struct cpl_abort_req *req = cplhdr(skb);
-
- c3cn_conn_debug("tdev 0x%p.\n", cdev);
-
- req->cmd = CPL_ABORT_NO_RST;
- cxgb3_ofld_send(cdev, skb);
-}
-
-static inline void c3cn_purge_write_queue(struct s3_conn *c3cn)
-{
- struct sk_buff *skb;
-
- while ((skb = __skb_dequeue(&c3cn->write_queue)))
- __kfree_skb(skb);
-}
-
-static void send_abort_req(struct s3_conn *c3cn)
-{
- struct sk_buff *skb = c3cn->cpl_abort_req;
- struct cpl_abort_req *req;
- unsigned int tid = c3cn->tid;
-
- if (unlikely(c3cn->state == C3CN_STATE_ABORTING) || !skb ||
- !c3cn->cdev)
- return;
-
- c3cn_set_state(c3cn, C3CN_STATE_ABORTING);
-
- c3cn_conn_debug("c3cn 0x%p, flag ABORT_RPL + ABORT_SHUT.\n", c3cn);
-
- c3cn_set_flag(c3cn, C3CN_ABORT_RPL_PENDING);
-
- /* Purge the send queue so we don't send anything after an abort. */
- c3cn_purge_write_queue(c3cn);
-
- c3cn->cpl_abort_req = NULL;
- req = (struct cpl_abort_req *)skb->head;
- memset(req, 0, sizeof(*req));
-
- skb->priority = CPL_PRIORITY_DATA;
- set_arp_failure_handler(skb, abort_arp_failure);
-
- req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_REQ));
- req->wr.wr_lo = htonl(V_WR_TID(tid));
- OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ABORT_REQ, tid));
- req->rsvd0 = htonl(c3cn->snd_nxt);
- req->rsvd1 = !c3cn_flag(c3cn, C3CN_TX_DATA_SENT);
- req->cmd = CPL_ABORT_SEND_RST;
-
- l2t_send(c3cn->cdev, skb, c3cn->l2t);
-}
-
-/*
- * CPL connection abort reply: host ->
- *
- * Send an ABORT_RPL message in response of the ABORT_REQ received.
- */
-static void send_abort_rpl(struct s3_conn *c3cn, int rst_status)
-{
- struct sk_buff *skb = c3cn->cpl_abort_rpl;
- struct cpl_abort_rpl *rpl = (struct cpl_abort_rpl *)skb->head;
-
- c3cn->cpl_abort_rpl = NULL;
-
- skb->priority = CPL_PRIORITY_DATA;
- memset(rpl, 0, sizeof(*rpl));
- rpl->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_RPL));
- rpl->wr.wr_lo = htonl(V_WR_TID(c3cn->tid));
- OPCODE_TID(rpl) = htonl(MK_OPCODE_TID(CPL_ABORT_RPL, c3cn->tid));
- rpl->cmd = rst_status;
-
- cxgb3_ofld_send(c3cn->cdev, skb);
-}
-
-/*
- * CPL connection rx data ack: host ->
- * Send RX credits through an RX_DATA_ACK CPL message. Returns the number of
- * credits sent.
- */
-static u32 send_rx_credits(struct s3_conn *c3cn, u32 credits, u32 dack)
-{
- struct sk_buff *skb;
- struct cpl_rx_data_ack *req;
-
- skb = alloc_skb(sizeof(*req), GFP_ATOMIC);
- if (!skb)
- return 0;
-
- req = (struct cpl_rx_data_ack *)__skb_put(skb, sizeof(*req));
- req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
- req->wr.wr_lo = 0;
- OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_RX_DATA_ACK, c3cn->tid));
- req->credit_dack = htonl(dack | V_RX_CREDITS(credits));
- skb->priority = CPL_PRIORITY_ACK;
- cxgb3_ofld_send(c3cn->cdev, skb);
- return credits;
-}
-
-/*
- * CPL connection tx data: host ->
- *
- * Send iscsi PDU via TX_DATA CPL message. Returns the number of
- * credits sent.
- * Each TX_DATA consumes work request credit (wrs), so we need to keep track of
- * how many we've used so far and how many are pending (i.e., yet ack'ed by T3).
- */
-
-/*
- * For ULP connections HW may inserts digest bytes into the pdu. Those digest
- * bytes are not sent by the host but are part of the TCP payload and therefore
- * consume TCP sequence space.
- */
-static const unsigned int cxgb3_ulp_extra_len[] = { 0, 4, 4, 8 };
-static inline unsigned int ulp_extra_len(const struct sk_buff *skb)
-{
- return cxgb3_ulp_extra_len[skb_ulp_mode(skb) & 3];
-}
-
-static unsigned int wrlen __read_mostly;
-
-/*
- * The number of WRs needed for an skb depends on the number of fragments
- * in the skb and whether it has any payload in its main body. This maps the
- * length of the gather list represented by an skb into the # of necessary WRs.
- * The extra two fragments are for iscsi bhs and payload padding.
- */
-#define SKB_WR_LIST_SIZE (MAX_SKB_FRAGS + 2)
-static unsigned int skb_wrs[SKB_WR_LIST_SIZE] __read_mostly;
-
-static void s3_init_wr_tab(unsigned int wr_len)
-{
- int i;
-
- if (skb_wrs[1]) /* already initialized */
- return;
-
- for (i = 1; i < SKB_WR_LIST_SIZE; i++) {
- int sgl_len = (3 * i) / 2 + (i & 1);
-
- sgl_len += 3;
- skb_wrs[i] = (sgl_len <= wr_len
- ? 1 : 1 + (sgl_len - 2) / (wr_len - 1));
- }
-
- wrlen = wr_len * 8;
-}
-
-static inline void reset_wr_list(struct s3_conn *c3cn)
-{
- c3cn->wr_pending_head = c3cn->wr_pending_tail = NULL;
-}
-
-/*
- * Add a WR to a connections's list of pending WRs. This is a singly-linked
- * list of sk_buffs operating as a FIFO. The head is kept in wr_pending_head
- * and the tail in wr_pending_tail.
- */
-static inline void enqueue_wr(struct s3_conn *c3cn,
- struct sk_buff *skb)
-{
- skb_tx_wr_next(skb) = NULL;
-
- /*
- * We want to take an extra reference since both us and the driver
- * need to free the packet before it's really freed. We know there's
- * just one user currently so we use atomic_set rather than skb_get
- * to avoid the atomic op.
- */
- atomic_set(&skb->users, 2);
-
- if (!c3cn->wr_pending_head)
- c3cn->wr_pending_head = skb;
- else
- skb_tx_wr_next(c3cn->wr_pending_tail) = skb;
- c3cn->wr_pending_tail = skb;
-}
-
-static int count_pending_wrs(struct s3_conn *c3cn)
-{
- int n = 0;
- const struct sk_buff *skb = c3cn->wr_pending_head;
-
- while (skb) {
- n += skb->csum;
- skb = skb_tx_wr_next(skb);
- }
- return n;
-}
-
-static inline struct sk_buff *peek_wr(const struct s3_conn *c3cn)
-{
- return c3cn->wr_pending_head;
-}
-
-static inline void free_wr_skb(struct sk_buff *skb)
-{
- kfree_skb(skb);
-}
-
-static inline struct sk_buff *dequeue_wr(struct s3_conn *c3cn)
-{
- struct sk_buff *skb = c3cn->wr_pending_head;
-
- if (likely(skb)) {
- /* Don't bother clearing the tail */
- c3cn->wr_pending_head = skb_tx_wr_next(skb);
- skb_tx_wr_next(skb) = NULL;
- }
- return skb;
-}
-
-static void purge_wr_queue(struct s3_conn *c3cn)
-{
- struct sk_buff *skb;
- while ((skb = dequeue_wr(c3cn)) != NULL)
- free_wr_skb(skb);
-}
-
-static inline void make_tx_data_wr(struct s3_conn *c3cn, struct sk_buff *skb,
- int len, int req_completion)
-{
- struct tx_data_wr *req;
-
- skb_reset_transport_header(skb);
- req = (struct tx_data_wr *)__skb_push(skb, sizeof(*req));
- req->wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_TX_DATA) |
- (req_completion ? F_WR_COMPL : 0));
- req->wr_lo = htonl(V_WR_TID(c3cn->tid));
- req->sndseq = htonl(c3cn->snd_nxt);
- /* len includes the length of any HW ULP additions */
- req->len = htonl(len);
- req->param = htonl(V_TX_PORT(c3cn->l2t->smt_idx));
- /* V_TX_ULP_SUBMODE sets both the mode and submode */
- req->flags = htonl(V_TX_ULP_SUBMODE(skb_ulp_mode(skb)) |
- V_TX_SHOVE((skb_peek(&c3cn->write_queue) ? 0 : 1)));
-
- if (!c3cn_flag(c3cn, C3CN_TX_DATA_SENT)) {
- req->flags |= htonl(V_TX_ACK_PAGES(2) | F_TX_INIT |
- V_TX_CPU_IDX(c3cn->qset));
- /* Sendbuffer is in units of 32KB. */
- req->param |= htonl(V_TX_SNDBUF(cxgb3_snd_win >> 15));
- c3cn_set_flag(c3cn, C3CN_TX_DATA_SENT);
- }
-}
-
-/**
- * c3cn_push_tx_frames -- start transmit
- * @c3cn: the offloaded connection
- * @req_completion: request wr_ack or not
- *
- * Prepends TX_DATA_WR or CPL_CLOSE_CON_REQ headers to buffers waiting in a
- * connection's send queue and sends them on to T3. Must be called with the
- * connection's lock held. Returns the amount of send buffer space that was
- * freed as a result of sending queued data to T3.
- */
-static void arp_failure_discard(struct t3cdev *cdev, struct sk_buff *skb)
-{
- kfree_skb(skb);
-}
-
-static int c3cn_push_tx_frames(struct s3_conn *c3cn, int req_completion)
-{
- int total_size = 0;
- struct sk_buff *skb;
- struct t3cdev *cdev;
- struct cxgb3i_sdev_data *cdata;
-
- if (unlikely(c3cn->state == C3CN_STATE_CONNECTING ||
- c3cn->state == C3CN_STATE_CLOSE_WAIT_1 ||
- c3cn->state >= C3CN_STATE_ABORTING)) {
- c3cn_tx_debug("c3cn 0x%p, in closing state %u.\n",
- c3cn, c3cn->state);
- return 0;
- }
-
- cdev = c3cn->cdev;
- cdata = CXGB3_SDEV_DATA(cdev);
-
- while (c3cn->wr_avail
- && (skb = skb_peek(&c3cn->write_queue)) != NULL) {
- int len = skb->len; /* length before skb_push */
- int frags = skb_shinfo(skb)->nr_frags + (len != skb->data_len);
- int wrs_needed = skb_wrs[frags];
-
- if (wrs_needed > 1 && len + sizeof(struct tx_data_wr) <= wrlen)
- wrs_needed = 1;
-
- WARN_ON(frags >= SKB_WR_LIST_SIZE || wrs_needed < 1);
-
- if (c3cn->wr_avail < wrs_needed) {
- c3cn_tx_debug("c3cn 0x%p, skb len %u/%u, frag %u, "
- "wr %d < %u.\n",
- c3cn, skb->len, skb->data_len, frags,
- wrs_needed, c3cn->wr_avail);
- break;
- }
-
- __skb_unlink(skb, &c3cn->write_queue);
- skb->priority = CPL_PRIORITY_DATA;
- skb->csum = wrs_needed; /* remember this until the WR_ACK */
- c3cn->wr_avail -= wrs_needed;
- c3cn->wr_unacked += wrs_needed;
- enqueue_wr(c3cn, skb);
-
- c3cn_tx_debug("c3cn 0x%p, enqueue, skb len %u/%u, frag %u, "
- "wr %d, left %u, unack %u.\n",
- c3cn, skb->len, skb->data_len, frags,
- wrs_needed, c3cn->wr_avail, c3cn->wr_unacked);
-
-
- if (likely(skb_flags(skb) & C3CB_FLAG_NEED_HDR)) {
- if ((req_completion &&
- c3cn->wr_unacked == wrs_needed) ||
- (skb_flags(skb) & C3CB_FLAG_COMPL) ||
- c3cn->wr_unacked >= c3cn->wr_max / 2) {
- req_completion = 1;
- c3cn->wr_unacked = 0;
- }
- len += ulp_extra_len(skb);
- make_tx_data_wr(c3cn, skb, len, req_completion);
- c3cn->snd_nxt += len;
- skb_flags(skb) &= ~C3CB_FLAG_NEED_HDR;
- }
-
- total_size += skb->truesize;
- set_arp_failure_handler(skb, arp_failure_discard);
- l2t_send(cdev, skb, c3cn->l2t);
- }
- return total_size;
-}
-
-/*
- * process_cpl_msg: -> host
- * Top-level CPL message processing used by most CPL messages that
- * pertain to connections.
- */
-static inline void process_cpl_msg(void (*fn)(struct s3_conn *,
- struct sk_buff *),
- struct s3_conn *c3cn,
- struct sk_buff *skb)
-{
- spin_lock_bh(&c3cn->lock);
- fn(c3cn, skb);
- spin_unlock_bh(&c3cn->lock);
-}
-
-/*
- * process_cpl_msg_ref: -> host
- * Similar to process_cpl_msg() but takes an extra connection reference around
- * the call to the handler. Should be used if the handler may drop a
- * connection reference.
- */
-static inline void process_cpl_msg_ref(void (*fn) (struct s3_conn *,
- struct sk_buff *),
- struct s3_conn *c3cn,
- struct sk_buff *skb)
-{
- c3cn_hold(c3cn);
- process_cpl_msg(fn, c3cn, skb);
- c3cn_put(c3cn);
-}
-
-/*
- * Process a CPL_ACT_ESTABLISH message: -> host
- * Updates connection state from an active establish CPL message. Runs with
- * the connection lock held.
- */
-
-static inline void s3_free_atid(struct t3cdev *cdev, unsigned int tid)
-{
- struct s3_conn *c3cn = cxgb3_free_atid(cdev, tid);
- if (c3cn)
- c3cn_put(c3cn);
-}
-
-static void c3cn_established(struct s3_conn *c3cn, u32 snd_isn,
- unsigned int opt)
-{
- c3cn_conn_debug("c3cn 0x%p, state %u.\n", c3cn, c3cn->state);
-
- c3cn->write_seq = c3cn->snd_nxt = c3cn->snd_una = snd_isn;
-
- /*
- * Causes the first RX_DATA_ACK to supply any Rx credits we couldn't
- * pass through opt0.
- */
- if (cxgb3_rcv_win > (M_RCV_BUFSIZ << 10))
- c3cn->rcv_wup -= cxgb3_rcv_win - (M_RCV_BUFSIZ << 10);
-
- dst_confirm(c3cn->dst_cache);
-
- smp_mb();
-
- c3cn_set_state(c3cn, C3CN_STATE_ESTABLISHED);
-}
-
-static void process_act_establish(struct s3_conn *c3cn, struct sk_buff *skb)
-{
- struct cpl_act_establish *req = cplhdr(skb);
- u32 rcv_isn = ntohl(req->rcv_isn); /* real RCV_ISN + 1 */
-
- c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
- c3cn, c3cn->state, c3cn->flags);
-
- if (unlikely(c3cn->state != C3CN_STATE_CONNECTING))
- cxgb3i_log_error("TID %u expected SYN_SENT, got EST., s %u\n",
- c3cn->tid, c3cn->state);
-
- c3cn->copied_seq = c3cn->rcv_wup = c3cn->rcv_nxt = rcv_isn;
- c3cn_established(c3cn, ntohl(req->snd_isn), ntohs(req->tcp_opt));
-
- __kfree_skb(skb);
-
- if (unlikely(c3cn_flag(c3cn, C3CN_ACTIVE_CLOSE_NEEDED)))
- /* upper layer has requested closing */
- send_abort_req(c3cn);
- else {
- if (skb_queue_len(&c3cn->write_queue))
- c3cn_push_tx_frames(c3cn, 1);
- cxgb3i_conn_tx_open(c3cn);
- }
-}
-
-static int do_act_establish(struct t3cdev *cdev, struct sk_buff *skb,
- void *ctx)
-{
- struct cpl_act_establish *req = cplhdr(skb);
- unsigned int tid = GET_TID(req);
- unsigned int atid = G_PASS_OPEN_TID(ntohl(req->tos_tid));
- struct s3_conn *c3cn = ctx;
- struct cxgb3i_sdev_data *cdata = CXGB3_SDEV_DATA(cdev);
-
- c3cn_conn_debug("rcv, tid 0x%x, c3cn 0x%p, s %u, f 0x%lx.\n",
- tid, c3cn, c3cn->state, c3cn->flags);
-
- c3cn->tid = tid;
- c3cn_hold(c3cn);
- cxgb3_insert_tid(cdata->cdev, cdata->client, c3cn, tid);
- s3_free_atid(cdev, atid);
-
- c3cn->qset = G_QNUM(ntohl(skb->csum));
-
- process_cpl_msg(process_act_establish, c3cn, skb);
- return 0;
-}
-
-/*
- * Process a CPL_ACT_OPEN_RPL message: -> host
- * Handle active open failures.
- */
-static int act_open_rpl_status_to_errno(int status)
-{
- switch (status) {
- case CPL_ERR_CONN_RESET:
- return -ECONNREFUSED;
- case CPL_ERR_ARP_MISS:
- return -EHOSTUNREACH;
- case CPL_ERR_CONN_TIMEDOUT:
- return -ETIMEDOUT;
- case CPL_ERR_TCAM_FULL:
- return -ENOMEM;
- case CPL_ERR_CONN_EXIST:
- cxgb3i_log_error("ACTIVE_OPEN_RPL: 4-tuple in use\n");
- return -EADDRINUSE;
- default:
- return -EIO;
- }
-}
-
-static void act_open_retry_timer(unsigned long data)
-{
- struct sk_buff *skb;
- struct s3_conn *c3cn = (struct s3_conn *)data;
-
- c3cn_conn_debug("c3cn 0x%p, state %u.\n", c3cn, c3cn->state);
-
- spin_lock_bh(&c3cn->lock);
- skb = alloc_skb(sizeof(struct cpl_act_open_req), GFP_ATOMIC);
- if (!skb)
- fail_act_open(c3cn, -ENOMEM);
- else {
- skb->sk = (struct sock *)c3cn;
- set_arp_failure_handler(skb, act_open_req_arp_failure);
- make_act_open_req(c3cn, skb, c3cn->tid, c3cn->l2t);
- l2t_send(c3cn->cdev, skb, c3cn->l2t);
- }
- spin_unlock_bh(&c3cn->lock);
- c3cn_put(c3cn);
-}
-
-static void process_act_open_rpl(struct s3_conn *c3cn, struct sk_buff *skb)
-{
- struct cpl_act_open_rpl *rpl = cplhdr(skb);
-
- c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
- c3cn, c3cn->state, c3cn->flags);
-
- if (rpl->status == CPL_ERR_CONN_EXIST &&
- c3cn->retry_timer.function != act_open_retry_timer) {
- c3cn->retry_timer.function = act_open_retry_timer;
- if (!mod_timer(&c3cn->retry_timer, jiffies + HZ / 2))
- c3cn_hold(c3cn);
- } else
- fail_act_open(c3cn, act_open_rpl_status_to_errno(rpl->status));
- __kfree_skb(skb);
-}
-
-static int do_act_open_rpl(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
-{
- struct s3_conn *c3cn = ctx;
- struct cpl_act_open_rpl *rpl = cplhdr(skb);
-
- c3cn_conn_debug("rcv, status 0x%x, c3cn 0x%p, s %u, f 0x%lx.\n",
- rpl->status, c3cn, c3cn->state, c3cn->flags);
-
- if (rpl->status != CPL_ERR_TCAM_FULL &&
- rpl->status != CPL_ERR_CONN_EXIST &&
- rpl->status != CPL_ERR_ARP_MISS)
- cxgb3_queue_tid_release(cdev, GET_TID(rpl));
-
- process_cpl_msg_ref(process_act_open_rpl, c3cn, skb);
- return 0;
-}
-
-/*
- * Process PEER_CLOSE CPL messages: -> host
- * Handle peer FIN.
- */
-static void process_peer_close(struct s3_conn *c3cn, struct sk_buff *skb)
-{
- c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
- c3cn, c3cn->state, c3cn->flags);
-
- if (c3cn_flag(c3cn, C3CN_ABORT_RPL_PENDING))
- goto out;
-
- switch (c3cn->state) {
- case C3CN_STATE_ESTABLISHED:
- c3cn_set_state(c3cn, C3CN_STATE_PASSIVE_CLOSE);
- break;
- case C3CN_STATE_ACTIVE_CLOSE:
- c3cn_set_state(c3cn, C3CN_STATE_CLOSE_WAIT_2);
- break;
- case C3CN_STATE_CLOSE_WAIT_1:
- c3cn_closed(c3cn);
- break;
- case C3CN_STATE_ABORTING:
- break;
- default:
- cxgb3i_log_error("%s: peer close, TID %u in bad state %u\n",
- c3cn->cdev->name, c3cn->tid, c3cn->state);
- }
-
- cxgb3i_conn_closing(c3cn);
-out:
- __kfree_skb(skb);
-}
-
-static int do_peer_close(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
-{
- struct s3_conn *c3cn = ctx;
-
- c3cn_conn_debug("rcv, c3cn 0x%p, s %u, f 0x%lx.\n",
- c3cn, c3cn->state, c3cn->flags);
- process_cpl_msg_ref(process_peer_close, c3cn, skb);
- return 0;
-}
-
-/*
- * Process CLOSE_CONN_RPL CPL message: -> host
- * Process a peer ACK to our FIN.
- */
-static void process_close_con_rpl(struct s3_conn *c3cn, struct sk_buff *skb)
-{
- struct cpl_close_con_rpl *rpl = cplhdr(skb);
-
- c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
- c3cn, c3cn->state, c3cn->flags);
-
- c3cn->snd_una = ntohl(rpl->snd_nxt) - 1; /* exclude FIN */
-
- if (c3cn_flag(c3cn, C3CN_ABORT_RPL_PENDING))
- goto out;
-
- switch (c3cn->state) {
- case C3CN_STATE_ACTIVE_CLOSE:
- c3cn_set_state(c3cn, C3CN_STATE_CLOSE_WAIT_1);
- break;
- case C3CN_STATE_CLOSE_WAIT_1:
- case C3CN_STATE_CLOSE_WAIT_2:
- c3cn_closed(c3cn);
- break;
- case C3CN_STATE_ABORTING:
- break;
- default:
- cxgb3i_log_error("%s: close_rpl, TID %u in bad state %u\n",
- c3cn->cdev->name, c3cn->tid, c3cn->state);
- }
-
-out:
- kfree_skb(skb);
-}
-
-static int do_close_con_rpl(struct t3cdev *cdev, struct sk_buff *skb,
- void *ctx)
-{
- struct s3_conn *c3cn = ctx;
-
- c3cn_conn_debug("rcv, c3cn 0x%p, s %u, f 0x%lx.\n",
- c3cn, c3cn->state, c3cn->flags);
-
- process_cpl_msg_ref(process_close_con_rpl, c3cn, skb);
- return 0;
-}
-
-/*
- * Process ABORT_REQ_RSS CPL message: -> host
- * Process abort requests. If we are waiting for an ABORT_RPL we ignore this
- * request except that we need to reply to it.
- */
-
-static int abort_status_to_errno(struct s3_conn *c3cn, int abort_reason,
- int *need_rst)
-{
- switch (abort_reason) {
- case CPL_ERR_BAD_SYN: /* fall through */
- case CPL_ERR_CONN_RESET:
- return c3cn->state > C3CN_STATE_ESTABLISHED ?
- -EPIPE : -ECONNRESET;
- case CPL_ERR_XMIT_TIMEDOUT:
- case CPL_ERR_PERSIST_TIMEDOUT:
- case CPL_ERR_FINWAIT2_TIMEDOUT:
- case CPL_ERR_KEEPALIVE_TIMEDOUT:
- return -ETIMEDOUT;
- default:
- return -EIO;
- }
-}
-
-static void process_abort_req(struct s3_conn *c3cn, struct sk_buff *skb)
-{
- int rst_status = CPL_ABORT_NO_RST;
- const struct cpl_abort_req_rss *req = cplhdr(skb);
-
- c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
- c3cn, c3cn->state, c3cn->flags);
-
- if (!c3cn_flag(c3cn, C3CN_ABORT_REQ_RCVD)) {
- c3cn_set_flag(c3cn, C3CN_ABORT_REQ_RCVD);
- c3cn_set_state(c3cn, C3CN_STATE_ABORTING);
- __kfree_skb(skb);
- return;
- }
-
- c3cn_clear_flag(c3cn, C3CN_ABORT_REQ_RCVD);
- send_abort_rpl(c3cn, rst_status);
-
- if (!c3cn_flag(c3cn, C3CN_ABORT_RPL_PENDING)) {
- c3cn->err =
- abort_status_to_errno(c3cn, req->status, &rst_status);
- c3cn_closed(c3cn);
- }
-}
-
-static int do_abort_req(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
-{
- const struct cpl_abort_req_rss *req = cplhdr(skb);
- struct s3_conn *c3cn = ctx;
-
- c3cn_conn_debug("rcv, c3cn 0x%p, s 0x%x, f 0x%lx.\n",
- c3cn, c3cn->state, c3cn->flags);
-
- if (req->status == CPL_ERR_RTX_NEG_ADVICE ||
- req->status == CPL_ERR_PERSIST_NEG_ADVICE) {
- __kfree_skb(skb);
- return 0;
- }
-
- process_cpl_msg_ref(process_abort_req, c3cn, skb);
- return 0;
-}
-
-/*
- * Process ABORT_RPL_RSS CPL message: -> host
- * Process abort replies. We only process these messages if we anticipate
- * them as the coordination between SW and HW in this area is somewhat lacking
- * and sometimes we get ABORT_RPLs after we are done with the connection that
- * originated the ABORT_REQ.
- */
-static void process_abort_rpl(struct s3_conn *c3cn, struct sk_buff *skb)
-{
- c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
- c3cn, c3cn->state, c3cn->flags);
-
- if (c3cn_flag(c3cn, C3CN_ABORT_RPL_PENDING)) {
- if (!c3cn_flag(c3cn, C3CN_ABORT_RPL_RCVD))
- c3cn_set_flag(c3cn, C3CN_ABORT_RPL_RCVD);
- else {
- c3cn_clear_flag(c3cn, C3CN_ABORT_RPL_RCVD);
- c3cn_clear_flag(c3cn, C3CN_ABORT_RPL_PENDING);
- if (c3cn_flag(c3cn, C3CN_ABORT_REQ_RCVD))
- cxgb3i_log_error("%s tid %u, ABORT_RPL_RSS\n",
- c3cn->cdev->name, c3cn->tid);
- c3cn_closed(c3cn);
- }
- }
- __kfree_skb(skb);
-}
-
-static int do_abort_rpl(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
-{
- struct cpl_abort_rpl_rss *rpl = cplhdr(skb);
- struct s3_conn *c3cn = ctx;
-
- c3cn_conn_debug("rcv, status 0x%x, c3cn 0x%p, s %u, 0x%lx.\n",
- rpl->status, c3cn, c3cn ? c3cn->state : 0,
- c3cn ? c3cn->flags : 0UL);
-
- /*
- * Ignore replies to post-close aborts indicating that the abort was
- * requested too late. These connections are terminated when we get
- * PEER_CLOSE or CLOSE_CON_RPL and by the time the abort_rpl_rss
- * arrives the TID is either no longer used or it has been recycled.
- */
- if (rpl->status == CPL_ERR_ABORT_FAILED)
- goto discard;
-
- /*
- * Sometimes we've already closed the connection, e.g., a post-close
- * abort races with ABORT_REQ_RSS, the latter frees the connection
- * expecting the ABORT_REQ will fail with CPL_ERR_ABORT_FAILED,
- * but FW turns the ABORT_REQ into a regular one and so we get
- * ABORT_RPL_RSS with status 0 and no connection.
- */
- if (!c3cn)
- goto discard;
-
- process_cpl_msg_ref(process_abort_rpl, c3cn, skb);
- return 0;
-
-discard:
- __kfree_skb(skb);
- return 0;
-}
-
-/*
- * Process RX_ISCSI_HDR CPL message: -> host
- * Handle received PDUs, the payload could be DDP'ed. If not, the payload
- * follow after the bhs.
- */
-static void process_rx_iscsi_hdr(struct s3_conn *c3cn, struct sk_buff *skb)
-{
- struct cpl_iscsi_hdr *hdr_cpl = cplhdr(skb);
- struct cpl_iscsi_hdr_norss data_cpl;
- struct cpl_rx_data_ddp_norss ddp_cpl;
- unsigned int hdr_len, data_len, status;
- unsigned int len;
- int err;
-
- if (unlikely(c3cn->state >= C3CN_STATE_PASSIVE_CLOSE)) {
- if (c3cn->state != C3CN_STATE_ABORTING)
- send_abort_req(c3cn);
- __kfree_skb(skb);
- return;
- }
-
- skb_tcp_seq(skb) = ntohl(hdr_cpl->seq);
- skb_flags(skb) = 0;
-
- skb_reset_transport_header(skb);
- __skb_pull(skb, sizeof(struct cpl_iscsi_hdr));
-
- len = hdr_len = ntohs(hdr_cpl->len);
- /* msg coalesce is off or not enough data received */
- if (skb->len <= hdr_len) {
- cxgb3i_log_error("%s: TID %u, ISCSI_HDR, skb len %u < %u.\n",
- c3cn->cdev->name, c3cn->tid,
- skb->len, hdr_len);
- goto abort_conn;
- }
-
- err = skb_copy_bits(skb, skb->len - sizeof(ddp_cpl), &ddp_cpl,
- sizeof(ddp_cpl));
- if (err < 0)
- goto abort_conn;
-
- skb_ulp_mode(skb) = ULP2_FLAG_DATA_READY;
- skb_rx_pdulen(skb) = ntohs(ddp_cpl.len);
- skb_rx_ddigest(skb) = ntohl(ddp_cpl.ulp_crc);
- status = ntohl(ddp_cpl.ddp_status);
-
- c3cn_rx_debug("rx skb 0x%p, len %u, pdulen %u, ddp status 0x%x.\n",
- skb, skb->len, skb_rx_pdulen(skb), status);
-
- if (status & (1 << RX_DDP_STATUS_HCRC_SHIFT))
- skb_ulp_mode(skb) |= ULP2_FLAG_HCRC_ERROR;
- if (status & (1 << RX_DDP_STATUS_DCRC_SHIFT))
- skb_ulp_mode(skb) |= ULP2_FLAG_DCRC_ERROR;
- if (status & (1 << RX_DDP_STATUS_PAD_SHIFT))
- skb_ulp_mode(skb) |= ULP2_FLAG_PAD_ERROR;
-
- if (skb->len > (hdr_len + sizeof(ddp_cpl))) {
- err = skb_copy_bits(skb, hdr_len, &data_cpl, sizeof(data_cpl));
- if (err < 0)
- goto abort_conn;
- data_len = ntohs(data_cpl.len);
- len += sizeof(data_cpl) + data_len;
- } else if (status & (1 << RX_DDP_STATUS_DDP_SHIFT))
- skb_ulp_mode(skb) |= ULP2_FLAG_DATA_DDPED;
-
- c3cn->rcv_nxt = ntohl(ddp_cpl.seq) + skb_rx_pdulen(skb);
- __pskb_trim(skb, len);
- __skb_queue_tail(&c3cn->receive_queue, skb);
- cxgb3i_conn_pdu_ready(c3cn);
-
- return;
-
-abort_conn:
- send_abort_req(c3cn);
- __kfree_skb(skb);
-}
-
-static int do_iscsi_hdr(struct t3cdev *t3dev, struct sk_buff *skb, void *ctx)
-{
- struct s3_conn *c3cn = ctx;
-
- process_cpl_msg(process_rx_iscsi_hdr, c3cn, skb);
- return 0;
-}
-
-/*
- * Process TX_DATA_ACK CPL messages: -> host
- * Process an acknowledgment of WR completion. Advance snd_una and send the
- * next batch of work requests from the write queue.
- */
-static void check_wr_invariants(struct s3_conn *c3cn)
-{
- int pending = count_pending_wrs(c3cn);
-
- if (unlikely(c3cn->wr_avail + pending != c3cn->wr_max))
- cxgb3i_log_error("TID %u: credit imbalance: avail %u, "
- "pending %u, total should be %u\n",
- c3cn->tid, c3cn->wr_avail, pending,
- c3cn->wr_max);
-}
-
-static void process_wr_ack(struct s3_conn *c3cn, struct sk_buff *skb)
-{
- struct cpl_wr_ack *hdr = cplhdr(skb);
- unsigned int credits = ntohs(hdr->credits);
- u32 snd_una = ntohl(hdr->snd_una);
-
- c3cn_tx_debug("%u WR credits, avail %u, unack %u, TID %u, state %u.\n",
- credits, c3cn->wr_avail, c3cn->wr_unacked,
- c3cn->tid, c3cn->state);
-
- c3cn->wr_avail += credits;
- if (c3cn->wr_unacked > c3cn->wr_max - c3cn->wr_avail)
- c3cn->wr_unacked = c3cn->wr_max - c3cn->wr_avail;
-
- while (credits) {
- struct sk_buff *p = peek_wr(c3cn);
-
- if (unlikely(!p)) {
- cxgb3i_log_error("%u WR_ACK credits for TID %u with "
- "nothing pending, state %u\n",
- credits, c3cn->tid, c3cn->state);
- break;
- }
- if (unlikely(credits < p->csum)) {
- struct tx_data_wr *w = cplhdr(p);
- cxgb3i_log_error("TID %u got %u WR credits need %u, "
- "len %u, main body %u, frags %u, "
- "seq # %u, ACK una %u, ACK nxt %u, "
- "WR_AVAIL %u, WRs pending %u\n",
- c3cn->tid, credits, p->csum, p->len,
- p->len - p->data_len,
- skb_shinfo(p)->nr_frags,
- ntohl(w->sndseq), snd_una,
- ntohl(hdr->snd_nxt), c3cn->wr_avail,
- count_pending_wrs(c3cn) - credits);
- p->csum -= credits;
- break;
- } else {
- dequeue_wr(c3cn);
- credits -= p->csum;
- free_wr_skb(p);
- }
- }
-
- check_wr_invariants(c3cn);
-
- if (unlikely(before(snd_una, c3cn->snd_una))) {
- cxgb3i_log_error("TID %u, unexpected sequence # %u in WR_ACK "
- "snd_una %u\n",
- c3cn->tid, snd_una, c3cn->snd_una);
- goto out_free;
- }
-
- if (c3cn->snd_una != snd_una) {
- c3cn->snd_una = snd_una;
- dst_confirm(c3cn->dst_cache);
- }
-
- if (skb_queue_len(&c3cn->write_queue)) {
- if (c3cn_push_tx_frames(c3cn, 0))
- cxgb3i_conn_tx_open(c3cn);
- } else
- cxgb3i_conn_tx_open(c3cn);
-out_free:
- __kfree_skb(skb);
-}
-
-static int do_wr_ack(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
-{
- struct s3_conn *c3cn = ctx;
-
- process_cpl_msg(process_wr_ack, c3cn, skb);
- return 0;
-}
-
-/*
- * for each connection, pre-allocate skbs needed for close/abort requests. So
- * that we can service the request right away.
- */
-static void c3cn_free_cpl_skbs(struct s3_conn *c3cn)
-{
- if (c3cn->cpl_close)
- kfree_skb(c3cn->cpl_close);
- if (c3cn->cpl_abort_req)
- kfree_skb(c3cn->cpl_abort_req);
- if (c3cn->cpl_abort_rpl)
- kfree_skb(c3cn->cpl_abort_rpl);
-}
-
-static int c3cn_alloc_cpl_skbs(struct s3_conn *c3cn)
-{
- c3cn->cpl_close = alloc_skb(sizeof(struct cpl_close_con_req),
- GFP_KERNEL);
- if (!c3cn->cpl_close)
- return -ENOMEM;
- skb_put(c3cn->cpl_close, sizeof(struct cpl_close_con_req));
-
- c3cn->cpl_abort_req = alloc_skb(sizeof(struct cpl_abort_req),
- GFP_KERNEL);
- if (!c3cn->cpl_abort_req)
- goto free_cpl_skbs;
- skb_put(c3cn->cpl_abort_req, sizeof(struct cpl_abort_req));
-
- c3cn->cpl_abort_rpl = alloc_skb(sizeof(struct cpl_abort_rpl),
- GFP_KERNEL);
- if (!c3cn->cpl_abort_rpl)
- goto free_cpl_skbs;
- skb_put(c3cn->cpl_abort_rpl, sizeof(struct cpl_abort_rpl));
-
- return 0;
-
-free_cpl_skbs:
- c3cn_free_cpl_skbs(c3cn);
- return -ENOMEM;
-}
-
-/**
- * c3cn_release_offload_resources - release offload resource
- * @c3cn: the offloaded iscsi tcp connection.
- * Release resources held by an offload connection (TID, L2T entry, etc.)
- */
-static void c3cn_release_offload_resources(struct s3_conn *c3cn)
-{
- struct t3cdev *cdev = c3cn->cdev;
- unsigned int tid = c3cn->tid;
-
- c3cn->qset = 0;
- c3cn_free_cpl_skbs(c3cn);
-
- if (c3cn->wr_avail != c3cn->wr_max) {
- purge_wr_queue(c3cn);
- reset_wr_list(c3cn);
- }
-
- if (cdev) {
- if (c3cn->l2t) {
- l2t_release(L2DATA(cdev), c3cn->l2t);
- c3cn->l2t = NULL;
- }
- if (c3cn->state == C3CN_STATE_CONNECTING)
- /* we have ATID */
- s3_free_atid(cdev, tid);
- else {
- /* we have TID */
- cxgb3_remove_tid(cdev, (void *)c3cn, tid);
- c3cn_put(c3cn);
- }
- }
-
- c3cn->dst_cache = NULL;
- c3cn->cdev = NULL;
-}
-
-/**
- * cxgb3i_c3cn_create - allocate and initialize an s3_conn structure
- * returns the s3_conn structure allocated.
- */
-struct s3_conn *cxgb3i_c3cn_create(void)
-{
- struct s3_conn *c3cn;
-
- c3cn = kzalloc(sizeof(*c3cn), GFP_KERNEL);
- if (!c3cn)
- return NULL;
-
- /* pre-allocate close/abort cpl, so we don't need to wait for memory
- when close/abort is requested. */
- if (c3cn_alloc_cpl_skbs(c3cn) < 0)
- goto free_c3cn;
-
- c3cn_conn_debug("alloc c3cn 0x%p.\n", c3cn);
-
- c3cn->flags = 0;
- spin_lock_init(&c3cn->lock);
- atomic_set(&c3cn->refcnt, 1);
- skb_queue_head_init(&c3cn->receive_queue);
- skb_queue_head_init(&c3cn->write_queue);
- setup_timer(&c3cn->retry_timer, NULL, (unsigned long)c3cn);
- rwlock_init(&c3cn->callback_lock);
-
- return c3cn;
-
-free_c3cn:
- kfree(c3cn);
- return NULL;
-}
-
-static void c3cn_active_close(struct s3_conn *c3cn)
-{
- int data_lost;
- int close_req = 0;
-
- c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
- c3cn, c3cn->state, c3cn->flags);
-
- dst_confirm(c3cn->dst_cache);
-
- c3cn_hold(c3cn);
- spin_lock_bh(&c3cn->lock);
-
- data_lost = skb_queue_len(&c3cn->receive_queue);
- __skb_queue_purge(&c3cn->receive_queue);
-
- switch (c3cn->state) {
- case C3CN_STATE_CLOSED:
- case C3CN_STATE_ACTIVE_CLOSE:
- case C3CN_STATE_CLOSE_WAIT_1:
- case C3CN_STATE_CLOSE_WAIT_2:
- case C3CN_STATE_ABORTING:
- /* nothing need to be done */
- break;
- case C3CN_STATE_CONNECTING:
- /* defer until cpl_act_open_rpl or cpl_act_establish */
- c3cn_set_flag(c3cn, C3CN_ACTIVE_CLOSE_NEEDED);
- break;
- case C3CN_STATE_ESTABLISHED:
- close_req = 1;
- c3cn_set_state(c3cn, C3CN_STATE_ACTIVE_CLOSE);
- break;
- case C3CN_STATE_PASSIVE_CLOSE:
- close_req = 1;
- c3cn_set_state(c3cn, C3CN_STATE_CLOSE_WAIT_2);
- break;
- }
-
- if (close_req) {
- if (data_lost)
- /* Unread data was tossed, zap the connection. */
- send_abort_req(c3cn);
- else
- send_close_req(c3cn);
- }
-
- spin_unlock_bh(&c3cn->lock);
- c3cn_put(c3cn);
-}
-
-/**
- * cxgb3i_c3cn_release - close and release an iscsi tcp connection and any
- * resource held
- * @c3cn: the iscsi tcp connection
- */
-void cxgb3i_c3cn_release(struct s3_conn *c3cn)
-{
- c3cn_conn_debug("c3cn 0x%p, s %u, f 0x%lx.\n",
- c3cn, c3cn->state, c3cn->flags);
- if (unlikely(c3cn->state == C3CN_STATE_CONNECTING))
- c3cn_set_flag(c3cn, C3CN_ACTIVE_CLOSE_NEEDED);
- else if (likely(c3cn->state != C3CN_STATE_CLOSED))
- c3cn_active_close(c3cn);
- c3cn_put(c3cn);
-}
-
-static int is_cxgb3_dev(struct net_device *dev)
-{
- struct cxgb3i_sdev_data *cdata;
- struct net_device *ndev = dev;
-
- if (dev->priv_flags & IFF_802_1Q_VLAN)
- ndev = vlan_dev_real_dev(dev);
-
- write_lock(&cdata_rwlock);
- list_for_each_entry(cdata, &cdata_list, list) {
- struct adap_ports *ports = &cdata->ports;
- int i;
-
- for (i = 0; i < ports->nports; i++)
- if (ndev == ports->lldevs[i]) {
- write_unlock(&cdata_rwlock);
- return 1;
- }
- }
- write_unlock(&cdata_rwlock);
- return 0;
-}
-
-/**
- * cxgb3_egress_dev - return the cxgb3 egress device
- * @root_dev: the root device anchoring the search
- * @c3cn: the connection used to determine egress port in bonding mode
- * @context: in bonding mode, indicates a connection set up or failover
- *
- * Return egress device or NULL if the egress device isn't one of our ports.
- */
-static struct net_device *cxgb3_egress_dev(struct net_device *root_dev,
- struct s3_conn *c3cn,
- int context)
-{
- while (root_dev) {
- if (root_dev->priv_flags & IFF_802_1Q_VLAN)
- root_dev = vlan_dev_real_dev(root_dev);
- else if (is_cxgb3_dev(root_dev))
- return root_dev;
- else
- return NULL;
- }
- return NULL;
-}
-
-static struct rtable *find_route(struct net_device *dev,
- __be32 saddr, __be32 daddr,
- __be16 sport, __be16 dport)
-{
- struct rtable *rt;
- struct flowi fl = {
- .oif = dev ? dev->ifindex : 0,
- .nl_u = {
- .ip4_u = {
- .daddr = daddr,
- .saddr = saddr,
- .tos = 0 } },
- .proto = IPPROTO_TCP,
- .uli_u = {
- .ports = {
- .sport = sport,
- .dport = dport } } };
-
- if (ip_route_output_flow(&init_net, &rt, &fl, NULL, 0))
- return NULL;
- return rt;
-}
-
-/*
- * Assign offload parameters to some connection fields.
- */
-static void init_offload_conn(struct s3_conn *c3cn,
- struct t3cdev *cdev,
- struct dst_entry *dst)
-{
- BUG_ON(c3cn->cdev != cdev);
- c3cn->wr_max = c3cn->wr_avail = T3C_DATA(cdev)->max_wrs - 1;
- c3cn->wr_unacked = 0;
- c3cn->mss_idx = select_mss(c3cn, dst_mtu(dst));
-
- reset_wr_list(c3cn);
-}
-
-static int initiate_act_open(struct s3_conn *c3cn, struct net_device *dev)
-{
- struct cxgb3i_sdev_data *cdata = NDEV2CDATA(dev);
- struct t3cdev *cdev = cdata->cdev;
- struct dst_entry *dst = c3cn->dst_cache;
- struct sk_buff *skb;
-
- c3cn_conn_debug("c3cn 0x%p, state %u, flag 0x%lx.\n",
- c3cn, c3cn->state, c3cn->flags);
- /*
- * Initialize connection data. Note that the flags and ULP mode are
- * initialized higher up ...
- */
- c3cn->dev = dev;
- c3cn->cdev = cdev;
- c3cn->tid = cxgb3_alloc_atid(cdev, cdata->client, c3cn);
- if (c3cn->tid < 0)
- goto out_err;
-
- c3cn->qset = 0;
- c3cn->l2t = t3_l2t_get(cdev, dst->neighbour, dev);
- if (!c3cn->l2t)
- goto free_tid;
-
- skb = alloc_skb(sizeof(struct cpl_act_open_req), GFP_KERNEL);
- if (!skb)
- goto free_l2t;
-
- skb->sk = (struct sock *)c3cn;
- set_arp_failure_handler(skb, act_open_req_arp_failure);
-
- c3cn_hold(c3cn);
-
- init_offload_conn(c3cn, cdev, dst);
- c3cn->err = 0;
-
- make_act_open_req(c3cn, skb, c3cn->tid, c3cn->l2t);
- l2t_send(cdev, skb, c3cn->l2t);
- return 0;
-
-free_l2t:
- l2t_release(L2DATA(cdev), c3cn->l2t);
-free_tid:
- s3_free_atid(cdev, c3cn->tid);
- c3cn->tid = 0;
-out_err:
- return -EINVAL;
-}
-
-/**
- * cxgb3i_find_dev - find the interface associated with the given address
- * @ipaddr: ip address
- */
-static struct net_device *
-cxgb3i_find_dev(struct net_device *dev, __be32 ipaddr)
-{
- struct flowi fl;
- int err;
- struct rtable *rt;
-
- memset(&fl, 0, sizeof(fl));
- fl.nl_u.ip4_u.daddr = ipaddr;
-
- err = ip_route_output_key(dev ? dev_net(dev) : &init_net, &rt, &fl);
- if (!err)
- return (&rt->dst)->dev;
-
- return NULL;
-}
-
-/**
- * cxgb3i_c3cn_connect - initiates an iscsi tcp connection to a given address
- * @c3cn: the iscsi tcp connection
- * @usin: destination address
- *
- * return 0 if active open request is sent, < 0 otherwise.
- */
-int cxgb3i_c3cn_connect(struct net_device *dev, struct s3_conn *c3cn,
- struct sockaddr_in *usin)
-{
- struct rtable *rt;
- struct cxgb3i_sdev_data *cdata;
- struct t3cdev *cdev;
- __be32 sipv4;
- struct net_device *dstdev;
- int err;
-
- c3cn_conn_debug("c3cn 0x%p, dev 0x%p.\n", c3cn, dev);
-
- if (usin->sin_family != AF_INET)
- return -EAFNOSUPPORT;
-
- c3cn->daddr.sin_port = usin->sin_port;
- c3cn->daddr.sin_addr.s_addr = usin->sin_addr.s_addr;
-
- dstdev = cxgb3i_find_dev(dev, usin->sin_addr.s_addr);
- if (!dstdev || !is_cxgb3_dev(dstdev))
- return -ENETUNREACH;
-
- if (dstdev->priv_flags & IFF_802_1Q_VLAN)
- dev = dstdev;
-
- rt = find_route(dev, c3cn->saddr.sin_addr.s_addr,
- c3cn->daddr.sin_addr.s_addr,
- c3cn->saddr.sin_port,
- c3cn->daddr.sin_port);
- if (rt == NULL) {
- c3cn_conn_debug("NO route to 0x%x, port %u, dev %s.\n",
- c3cn->daddr.sin_addr.s_addr,
- ntohs(c3cn->daddr.sin_port),
- dev ? dev->name : "any");
- return -ENETUNREACH;
- }
-
- if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
- c3cn_conn_debug("multi-cast route to 0x%x, port %u, dev %s.\n",
- c3cn->daddr.sin_addr.s_addr,
- ntohs(c3cn->daddr.sin_port),
- dev ? dev->name : "any");
- ip_rt_put(rt);
- return -ENETUNREACH;
- }
-
- if (!c3cn->saddr.sin_addr.s_addr)
- c3cn->saddr.sin_addr.s_addr = rt->rt_src;
-
- /* now commit destination to connection */
- c3cn->dst_cache = &rt->dst;
-
- /* try to establish an offloaded connection */
- dev = cxgb3_egress_dev(c3cn->dst_cache->dev, c3cn, 0);
- if (dev == NULL) {
- c3cn_conn_debug("c3cn 0x%p, egress dev NULL.\n", c3cn);
- return -ENETUNREACH;
- }
- cdata = NDEV2CDATA(dev);
- cdev = cdata->cdev;
-
- /* get a source port if one hasn't been provided */
- err = c3cn_get_port(c3cn, cdata);
- if (err)
- return err;
-
- c3cn_conn_debug("c3cn 0x%p get port %u.\n",
- c3cn, ntohs(c3cn->saddr.sin_port));
-
- sipv4 = cxgb3i_get_private_ipv4addr(dev);
- if (!sipv4) {
- c3cn_conn_debug("c3cn 0x%p, iscsi ip not configured.\n", c3cn);
- sipv4 = c3cn->saddr.sin_addr.s_addr;
- cxgb3i_set_private_ipv4addr(dev, sipv4);
- } else
- c3cn->saddr.sin_addr.s_addr = sipv4;
-
- c3cn_conn_debug("c3cn 0x%p, %pI4,%u-%pI4,%u SYN_SENT.\n",
- c3cn,
- &c3cn->saddr.sin_addr.s_addr,
- ntohs(c3cn->saddr.sin_port),
- &c3cn->daddr.sin_addr.s_addr,
- ntohs(c3cn->daddr.sin_port));
-
- c3cn_set_state(c3cn, C3CN_STATE_CONNECTING);
- if (!initiate_act_open(c3cn, dev))
- return 0;
-
- /*
- * If we get here, we don't have an offload connection so simply
- * return a failure.
- */
- err = -ENOTSUPP;
-
- /*
- * This trashes the connection and releases the local port,
- * if necessary.
- */
- c3cn_conn_debug("c3cn 0x%p -> CLOSED.\n", c3cn);
- c3cn_set_state(c3cn, C3CN_STATE_CLOSED);
- ip_rt_put(rt);
- c3cn_put_port(c3cn);
- return err;
-}
-
-/**
- * cxgb3i_c3cn_rx_credits - ack received tcp data.
- * @c3cn: iscsi tcp connection
- * @copied: # of bytes processed
- *
- * Called after some received data has been read. It returns RX credits
- * to the HW for the amount of data processed.
- */
-void cxgb3i_c3cn_rx_credits(struct s3_conn *c3cn, int copied)
-{
- struct t3cdev *cdev;
- int must_send;
- u32 credits, dack = 0;
-
- if (c3cn->state != C3CN_STATE_ESTABLISHED)
- return;
-
- credits = c3cn->copied_seq - c3cn->rcv_wup;
- if (unlikely(!credits))
- return;
-
- cdev = c3cn->cdev;
-
- if (unlikely(cxgb3_rx_credit_thres == 0))
- return;
-
- dack = F_RX_DACK_CHANGE | V_RX_DACK_MODE(1);
-
- /*
- * For coalescing to work effectively ensure the receive window has
- * at least 16KB left.
- */
- must_send = credits + 16384 >= cxgb3_rcv_win;
-
- if (must_send || credits >= cxgb3_rx_credit_thres)
- c3cn->rcv_wup += send_rx_credits(c3cn, credits, dack);
-}
-
-/**
- * cxgb3i_c3cn_send_pdus - send the skbs containing iscsi pdus
- * @c3cn: iscsi tcp connection
- * @skb: skb contains the iscsi pdu
- *
- * Add a list of skbs to a connection send queue. The skbs must comply with
- * the max size limit of the device and have a headroom of at least
- * TX_HEADER_LEN bytes.
- * Return # of bytes queued.
- */
-int cxgb3i_c3cn_send_pdus(struct s3_conn *c3cn, struct sk_buff *skb)
-{
- struct sk_buff *next;
- int err, copied = 0;
-
- spin_lock_bh(&c3cn->lock);
-
- if (c3cn->state != C3CN_STATE_ESTABLISHED) {
- c3cn_tx_debug("c3cn 0x%p, not in est. state %u.\n",
- c3cn, c3cn->state);
- err = -EAGAIN;
- goto out_err;
- }
-
- if (c3cn->err) {
- c3cn_tx_debug("c3cn 0x%p, err %d.\n", c3cn, c3cn->err);
- err = -EPIPE;
- goto out_err;
- }
-
- if (c3cn->write_seq - c3cn->snd_una >= cxgb3_snd_win) {
- c3cn_tx_debug("c3cn 0x%p, snd %u - %u > %u.\n",
- c3cn, c3cn->write_seq, c3cn->snd_una,
- cxgb3_snd_win);
- err = -ENOBUFS;
- goto out_err;
- }
-
- while (skb) {
- int frags = skb_shinfo(skb)->nr_frags +
- (skb->len != skb->data_len);
-
- if (unlikely(skb_headroom(skb) < TX_HEADER_LEN)) {
- c3cn_tx_debug("c3cn 0x%p, skb head.\n", c3cn);
- err = -EINVAL;
- goto out_err;
- }
-
- if (frags >= SKB_WR_LIST_SIZE) {
- cxgb3i_log_error("c3cn 0x%p, tx frags %d, len %u,%u.\n",
- c3cn, skb_shinfo(skb)->nr_frags,
- skb->len, skb->data_len);
- err = -EINVAL;
- goto out_err;
- }
-
- next = skb->next;
- skb->next = NULL;
- skb_entail(c3cn, skb, C3CB_FLAG_NO_APPEND | C3CB_FLAG_NEED_HDR);
- copied += skb->len;
- c3cn->write_seq += skb->len + ulp_extra_len(skb);
- skb = next;
- }
-done:
- if (likely(skb_queue_len(&c3cn->write_queue)))
- c3cn_push_tx_frames(c3cn, 1);
- spin_unlock_bh(&c3cn->lock);
- return copied;
-
-out_err:
- if (copied == 0 && err == -EPIPE)
- copied = c3cn->err ? c3cn->err : -EPIPE;
- else
- copied = err;
- goto done;
-}
-
-static void sdev_data_cleanup(struct cxgb3i_sdev_data *cdata)
-{
- struct adap_ports *ports = &cdata->ports;
- struct s3_conn *c3cn;
- int i;
-
- for (i = 0; i < cxgb3_max_connect; i++) {
- if (cdata->sport_conn[i]) {
- c3cn = cdata->sport_conn[i];
- cdata->sport_conn[i] = NULL;
-
- spin_lock_bh(&c3cn->lock);
- c3cn->cdev = NULL;
- c3cn_set_flag(c3cn, C3CN_OFFLOAD_DOWN);
- c3cn_closed(c3cn);
- spin_unlock_bh(&c3cn->lock);
- }
- }
-
- for (i = 0; i < ports->nports; i++)
- NDEV2CDATA(ports->lldevs[i]) = NULL;
-
- cxgb3i_free_big_mem(cdata);
-}
-
-void cxgb3i_sdev_cleanup(void)
-{
- struct cxgb3i_sdev_data *cdata;
-
- write_lock(&cdata_rwlock);
- list_for_each_entry(cdata, &cdata_list, list) {
- list_del(&cdata->list);
- sdev_data_cleanup(cdata);
- }
- write_unlock(&cdata_rwlock);
-}
-
-int cxgb3i_sdev_init(cxgb3_cpl_handler_func *cpl_handlers)
-{
- cpl_handlers[CPL_ACT_ESTABLISH] = do_act_establish;
- cpl_handlers[CPL_ACT_OPEN_RPL] = do_act_open_rpl;
- cpl_handlers[CPL_PEER_CLOSE] = do_peer_close;
- cpl_handlers[CPL_ABORT_REQ_RSS] = do_abort_req;
- cpl_handlers[CPL_ABORT_RPL_RSS] = do_abort_rpl;
- cpl_handlers[CPL_CLOSE_CON_RPL] = do_close_con_rpl;
- cpl_handlers[CPL_TX_DMA_ACK] = do_wr_ack;
- cpl_handlers[CPL_ISCSI_HDR] = do_iscsi_hdr;
-
- if (cxgb3_max_connect > CXGB3I_MAX_CONN)
- cxgb3_max_connect = CXGB3I_MAX_CONN;
- return 0;
-}
-
-/**
- * cxgb3i_sdev_add - allocate and initialize resources for each adapter found
- * @cdev: t3cdev adapter
- * @client: cxgb3 driver client
- */
-void cxgb3i_sdev_add(struct t3cdev *cdev, struct cxgb3_client *client)
-{
- struct cxgb3i_sdev_data *cdata;
- struct ofld_page_info rx_page_info;
- unsigned int wr_len;
- int mapsize = cxgb3_max_connect * sizeof(struct s3_conn *);
- int i;
-
- cdata = cxgb3i_alloc_big_mem(sizeof(*cdata) + mapsize, GFP_KERNEL);
- if (!cdata) {
- cxgb3i_log_warn("t3dev 0x%p, offload up, OOM %d.\n",
- cdev, mapsize);
- return;
- }
-
- if (cdev->ctl(cdev, GET_WR_LEN, &wr_len) < 0 ||
- cdev->ctl(cdev, GET_PORTS, &cdata->ports) < 0 ||
- cdev->ctl(cdev, GET_RX_PAGE_INFO, &rx_page_info) < 0) {
- cxgb3i_log_warn("t3dev 0x%p, offload up, ioctl failed.\n",
- cdev);
- goto free_cdata;
- }
-
- s3_init_wr_tab(wr_len);
-
- spin_lock_init(&cdata->lock);
- INIT_LIST_HEAD(&cdata->list);
- cdata->cdev = cdev;
- cdata->client = client;
-
- for (i = 0; i < cdata->ports.nports; i++)
- NDEV2CDATA(cdata->ports.lldevs[i]) = cdata;
-
- write_lock(&cdata_rwlock);
- list_add_tail(&cdata->list, &cdata_list);
- write_unlock(&cdata_rwlock);
-
- cxgb3i_log_info("t3dev 0x%p, offload up, added.\n", cdev);
- return;
-
-free_cdata:
- cxgb3i_free_big_mem(cdata);
-}
-
-/**
- * cxgb3i_sdev_remove - free the allocated resources for the adapter
- * @cdev: t3cdev adapter
- */
-void cxgb3i_sdev_remove(struct t3cdev *cdev)
-{
- struct cxgb3i_sdev_data *cdata = CXGB3_SDEV_DATA(cdev);
-
- cxgb3i_log_info("t3dev 0x%p, offload down, remove.\n", cdev);
-
- write_lock(&cdata_rwlock);
- list_del(&cdata->list);
- write_unlock(&cdata_rwlock);
-
- sdev_data_cleanup(cdata);
-}
+++ /dev/null
-/*
- * cxgb3i_offload.h: Chelsio S3xx iscsi offloaded tcp connection management
- *
- * Copyright (C) 2003-2008 Chelsio Communications. All rights reserved.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the LICENSE file included in this
- * release for licensing terms and conditions.
- *
- * Written by: Dimitris Michailidis (dm@chelsio.com)
- * Karen Xie (kxie@chelsio.com)
- */
-
-#ifndef _CXGB3I_OFFLOAD_H
-#define _CXGB3I_OFFLOAD_H
-
-#include <linux/skbuff.h>
-#include <linux/in.h>
-
-#include "common.h"
-#include "adapter.h"
-#include "t3cdev.h"
-#include "cxgb3_offload.h"
-
-#define cxgb3i_log_error(fmt...) printk(KERN_ERR "cxgb3i: ERR! " fmt)
-#define cxgb3i_log_warn(fmt...) printk(KERN_WARNING "cxgb3i: WARN! " fmt)
-#define cxgb3i_log_info(fmt...) printk(KERN_INFO "cxgb3i: " fmt)
-#define cxgb3i_log_debug(fmt, args...) \
- printk(KERN_INFO "cxgb3i: %s - " fmt, __func__ , ## args)
-
-/**
- * struct s3_conn - an iscsi tcp connection structure
- *
- * @dev: net device of with connection
- * @cdev: adapter t3cdev for net device
- * @flags: see c3cn_flags below
- * @tid: connection id assigned by the h/w
- * @qset: queue set used by connection
- * @mss_idx: Maximum Segment Size table index
- * @l2t: ARP resolution entry for offload packets
- * @wr_max: maximum in-flight writes
- * @wr_avail: number of writes available
- * @wr_unacked: writes since last request for completion notification
- * @wr_pending_head: head of pending write queue
- * @wr_pending_tail: tail of pending write queue
- * @cpl_close: skb for cpl_close_req
- * @cpl_abort_req: skb for cpl_abort_req
- * @cpl_abort_rpl: skb for cpl_abort_rpl
- * @lock: connection status lock
- * @refcnt: reference count on connection
- * @state: connection state
- * @saddr: source ip/port address
- * @daddr: destination ip/port address
- * @dst_cache: reference to destination route
- * @receive_queue: received PDUs
- * @write_queue: un-pushed pending writes
- * @retry_timer: retry timer for various operations
- * @err: connection error status
- * @callback_lock: lock for opaque user context
- * @user_data: opaque user context
- * @rcv_nxt: next receive seq. #
- * @copied_seq: head of yet unread data
- * @rcv_wup: rcv_nxt on last window update sent
- * @snd_nxt: next sequence we send
- * @snd_una: first byte we want an ack for
- * @write_seq: tail+1 of data held in send buffer
- */
-struct s3_conn {
- struct net_device *dev;
- struct t3cdev *cdev;
- unsigned long flags;
- int tid;
- int qset;
- int mss_idx;
- struct l2t_entry *l2t;
- int wr_max;
- int wr_avail;
- int wr_unacked;
- struct sk_buff *wr_pending_head;
- struct sk_buff *wr_pending_tail;
- struct sk_buff *cpl_close;
- struct sk_buff *cpl_abort_req;
- struct sk_buff *cpl_abort_rpl;
- spinlock_t lock;
- atomic_t refcnt;
- volatile unsigned int state;
- struct sockaddr_in saddr;
- struct sockaddr_in daddr;
- struct dst_entry *dst_cache;
- struct sk_buff_head receive_queue;
- struct sk_buff_head write_queue;
- struct timer_list retry_timer;
- int err;
- rwlock_t callback_lock;
- void *user_data;
-
- u32 rcv_nxt;
- u32 copied_seq;
- u32 rcv_wup;
- u32 snd_nxt;
- u32 snd_una;
- u32 write_seq;
-};
-
-/*
- * connection state
- */
-enum conn_states {
- C3CN_STATE_CONNECTING = 1,
- C3CN_STATE_ESTABLISHED,
- C3CN_STATE_ACTIVE_CLOSE,
- C3CN_STATE_PASSIVE_CLOSE,
- C3CN_STATE_CLOSE_WAIT_1,
- C3CN_STATE_CLOSE_WAIT_2,
- C3CN_STATE_ABORTING,
- C3CN_STATE_CLOSED,
-};
-
-static inline unsigned int c3cn_is_closing(const struct s3_conn *c3cn)
-{
- return c3cn->state >= C3CN_STATE_ACTIVE_CLOSE;
-}
-static inline unsigned int c3cn_is_established(const struct s3_conn *c3cn)
-{
- return c3cn->state == C3CN_STATE_ESTABLISHED;
-}
-
-/*
- * Connection flags -- many to track some close related events.
- */
-enum c3cn_flags {
- C3CN_ABORT_RPL_RCVD, /* received one ABORT_RPL_RSS message */
- C3CN_ABORT_REQ_RCVD, /* received one ABORT_REQ_RSS message */
- C3CN_ABORT_RPL_PENDING, /* expecting an abort reply */
- C3CN_TX_DATA_SENT, /* already sent a TX_DATA WR */
- C3CN_ACTIVE_CLOSE_NEEDED, /* need to be closed */
- C3CN_OFFLOAD_DOWN /* offload function off */
-};
-
-/**
- * cxgb3i_sdev_data - Per adapter data.
- * Linked off of each Ethernet device port on the adapter.
- * Also available via the t3cdev structure since we have pointers to our port
- * net_device's there ...
- *
- * @list: list head to link elements
- * @cdev: t3cdev adapter
- * @client: CPL client pointer
- * @ports: array of adapter ports
- * @sport_next: next port
- * @sport_conn: source port connection
- */
-struct cxgb3i_sdev_data {
- struct list_head list;
- struct t3cdev *cdev;
- struct cxgb3_client *client;
- struct adap_ports ports;
- spinlock_t lock;
- unsigned int sport_next;
- struct s3_conn *sport_conn[0];
-};
-#define NDEV2CDATA(ndev) (*(struct cxgb3i_sdev_data **)&(ndev)->ec_ptr)
-#define CXGB3_SDEV_DATA(cdev) NDEV2CDATA((cdev)->lldev)
-
-void cxgb3i_sdev_cleanup(void);
-int cxgb3i_sdev_init(cxgb3_cpl_handler_func *);
-void cxgb3i_sdev_add(struct t3cdev *, struct cxgb3_client *);
-void cxgb3i_sdev_remove(struct t3cdev *);
-
-struct s3_conn *cxgb3i_c3cn_create(void);
-int cxgb3i_c3cn_connect(struct net_device *, struct s3_conn *,
- struct sockaddr_in *);
-void cxgb3i_c3cn_rx_credits(struct s3_conn *, int);
-int cxgb3i_c3cn_send_pdus(struct s3_conn *, struct sk_buff *);
-void cxgb3i_c3cn_release(struct s3_conn *);
-
-/**
- * cxgb3_skb_cb - control block for received pdu state and ULP mode management.
- *
- * @flag: see C3CB_FLAG_* below
- * @ulp_mode: ULP mode/submode of sk_buff
- * @seq: tcp sequence number
- */
-struct cxgb3_skb_rx_cb {
- __u32 ddigest; /* data digest */
- __u32 pdulen; /* recovered pdu length */
-};
-
-struct cxgb3_skb_tx_cb {
- struct sk_buff *wr_next; /* next wr */
-};
-
-struct cxgb3_skb_cb {
- __u8 flags;
- __u8 ulp_mode;
- __u32 seq;
- union {
- struct cxgb3_skb_rx_cb rx;
- struct cxgb3_skb_tx_cb tx;
- };
-};
-
-#define CXGB3_SKB_CB(skb) ((struct cxgb3_skb_cb *)&((skb)->cb[0]))
-#define skb_flags(skb) (CXGB3_SKB_CB(skb)->flags)
-#define skb_ulp_mode(skb) (CXGB3_SKB_CB(skb)->ulp_mode)
-#define skb_tcp_seq(skb) (CXGB3_SKB_CB(skb)->seq)
-#define skb_rx_ddigest(skb) (CXGB3_SKB_CB(skb)->rx.ddigest)
-#define skb_rx_pdulen(skb) (CXGB3_SKB_CB(skb)->rx.pdulen)
-#define skb_tx_wr_next(skb) (CXGB3_SKB_CB(skb)->tx.wr_next)
-
-enum c3cb_flags {
- C3CB_FLAG_NEED_HDR = 1 << 0, /* packet needs a TX_DATA_WR header */
- C3CB_FLAG_NO_APPEND = 1 << 1, /* don't grow this skb */
- C3CB_FLAG_COMPL = 1 << 2, /* request WR completion */
-};
-
-/**
- * sge_opaque_hdr -
- * Opaque version of structure the SGE stores at skb->head of TX_DATA packets
- * and for which we must reserve space.
- */
-struct sge_opaque_hdr {
- void *dev;
- dma_addr_t addr[MAX_SKB_FRAGS + 1];
-};
-
-/* for TX: a skb must have a headroom of at least TX_HEADER_LEN bytes */
-#define TX_HEADER_LEN \
- (sizeof(struct tx_data_wr) + sizeof(struct sge_opaque_hdr))
-#define SKB_TX_HEADROOM SKB_MAX_HEAD(TX_HEADER_LEN)
-
-/*
- * get and set private ip for iscsi traffic
- */
-#define cxgb3i_get_private_ipv4addr(ndev) \
- (((struct port_info *)(netdev_priv(ndev)))->iscsi_ipv4addr)
-#define cxgb3i_set_private_ipv4addr(ndev, addr) \
- (((struct port_info *)(netdev_priv(ndev)))->iscsi_ipv4addr) = addr
-
-/* max. connections per adapter */
-#define CXGB3I_MAX_CONN 16384
-#endif /* _CXGB3_OFFLOAD_H */
+++ /dev/null
-/*
- * cxgb3i_pdu.c: Chelsio S3xx iSCSI driver.
- *
- * Copyright (c) 2008 Chelsio Communications, Inc.
- * Copyright (c) 2008 Mike Christie
- * Copyright (c) 2008 Red Hat, Inc. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation.
- *
- * Written by: Karen Xie (kxie@chelsio.com)
- */
-
-#include <linux/slab.h>
-#include <linux/skbuff.h>
-#include <linux/crypto.h>
-#include <scsi/scsi_cmnd.h>
-#include <scsi/scsi_host.h>
-
-#include "cxgb3i.h"
-#include "cxgb3i_pdu.h"
-
-#ifdef __DEBUG_CXGB3I_RX__
-#define cxgb3i_rx_debug cxgb3i_log_debug
-#else
-#define cxgb3i_rx_debug(fmt...)
-#endif
-
-#ifdef __DEBUG_CXGB3I_TX__
-#define cxgb3i_tx_debug cxgb3i_log_debug
-#else
-#define cxgb3i_tx_debug(fmt...)
-#endif
-
-/* always allocate rooms for AHS */
-#define SKB_TX_PDU_HEADER_LEN \
- (sizeof(struct iscsi_hdr) + ISCSI_MAX_AHS_SIZE)
-static unsigned int skb_extra_headroom;
-static struct page *pad_page;
-
-/*
- * pdu receive, interact with libiscsi_tcp
- */
-static inline int read_pdu_skb(struct iscsi_conn *conn, struct sk_buff *skb,
- unsigned int offset, int offloaded)
-{
- int status = 0;
- int bytes_read;
-
- bytes_read = iscsi_tcp_recv_skb(conn, skb, offset, offloaded, &status);
- switch (status) {
- case ISCSI_TCP_CONN_ERR:
- return -EIO;
- case ISCSI_TCP_SUSPENDED:
- /* no transfer - just have caller flush queue */
- return bytes_read;
- case ISCSI_TCP_SKB_DONE:
- /*
- * pdus should always fit in the skb and we should get
- * segment done notifcation.
- */
- iscsi_conn_printk(KERN_ERR, conn, "Invalid pdu or skb.");
- return -EFAULT;
- case ISCSI_TCP_SEGMENT_DONE:
- return bytes_read;
- default:
- iscsi_conn_printk(KERN_ERR, conn, "Invalid iscsi_tcp_recv_skb "
- "status %d\n", status);
- return -EINVAL;
- }
-}
-
-static int cxgb3i_conn_read_pdu_skb(struct iscsi_conn *conn,
- struct sk_buff *skb)
-{
- struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
- bool offloaded = 0;
- unsigned int offset;
- int rc;
-
- cxgb3i_rx_debug("conn 0x%p, skb 0x%p, len %u, flag 0x%x.\n",
- conn, skb, skb->len, skb_ulp_mode(skb));
-
- if (!iscsi_tcp_recv_segment_is_hdr(tcp_conn)) {
- iscsi_conn_failure(conn, ISCSI_ERR_PROTO);
- return -EIO;
- }
-
- if (conn->hdrdgst_en && (skb_ulp_mode(skb) & ULP2_FLAG_HCRC_ERROR)) {
- iscsi_conn_failure(conn, ISCSI_ERR_HDR_DGST);
- return -EIO;
- }
-
- if (conn->datadgst_en && (skb_ulp_mode(skb) & ULP2_FLAG_DCRC_ERROR)) {
- iscsi_conn_failure(conn, ISCSI_ERR_DATA_DGST);
- return -EIO;
- }
-
- /* iscsi hdr */
- rc = read_pdu_skb(conn, skb, 0, 0);
- if (rc <= 0)
- return rc;
-
- if (iscsi_tcp_recv_segment_is_hdr(tcp_conn))
- return 0;
-
- offset = rc;
- if (conn->hdrdgst_en)
- offset += ISCSI_DIGEST_SIZE;
-
- /* iscsi data */
- if (skb_ulp_mode(skb) & ULP2_FLAG_DATA_DDPED) {
- cxgb3i_rx_debug("skb 0x%p, opcode 0x%x, data %u, ddp'ed, "
- "itt 0x%x.\n",
- skb,
- tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK,
- tcp_conn->in.datalen,
- ntohl(tcp_conn->in.hdr->itt));
- offloaded = 1;
- } else {
- cxgb3i_rx_debug("skb 0x%p, opcode 0x%x, data %u, NOT ddp'ed, "
- "itt 0x%x.\n",
- skb,
- tcp_conn->in.hdr->opcode & ISCSI_OPCODE_MASK,
- tcp_conn->in.datalen,
- ntohl(tcp_conn->in.hdr->itt));
- offset += sizeof(struct cpl_iscsi_hdr_norss);
- }
-
- rc = read_pdu_skb(conn, skb, offset, offloaded);
- if (rc < 0)
- return rc;
- else
- return 0;
-}
-
-/*
- * pdu transmit, interact with libiscsi_tcp
- */
-static inline void tx_skb_setmode(struct sk_buff *skb, int hcrc, int dcrc)
-{
- u8 submode = 0;
-
- if (hcrc)
- submode |= 1;
- if (dcrc)
- submode |= 2;
- skb_ulp_mode(skb) = (ULP_MODE_ISCSI << 4) | submode;
-}
-
-void cxgb3i_conn_cleanup_task(struct iscsi_task *task)
-{
- struct cxgb3i_task_data *tdata = task->dd_data +
- sizeof(struct iscsi_tcp_task);
-
- /* never reached the xmit task callout */
- if (tdata->skb)
- __kfree_skb(tdata->skb);
- memset(tdata, 0, sizeof(struct cxgb3i_task_data));
-
- /* MNC - Do we need a check in case this is called but
- * cxgb3i_conn_alloc_pdu has never been called on the task */
- cxgb3i_release_itt(task, task->hdr_itt);
- iscsi_tcp_cleanup_task(task);
-}
-
-static int sgl_seek_offset(struct scatterlist *sgl, unsigned int sgcnt,
- unsigned int offset, unsigned int *off,
- struct scatterlist **sgp)
-{
- int i;
- struct scatterlist *sg;
-
- for_each_sg(sgl, sg, sgcnt, i) {
- if (offset < sg->length) {
- *off = offset;
- *sgp = sg;
- return 0;
- }
- offset -= sg->length;
- }
- return -EFAULT;
-}
-
-static int sgl_read_to_frags(struct scatterlist *sg, unsigned int sgoffset,
- unsigned int dlen, skb_frag_t *frags,
- int frag_max)
-{
- unsigned int datalen = dlen;
- unsigned int sglen = sg->length - sgoffset;
- struct page *page = sg_page(sg);
- int i;
-
- i = 0;
- do {
- unsigned int copy;
-
- if (!sglen) {
- sg = sg_next(sg);
- if (!sg) {
- cxgb3i_log_error("%s, sg NULL, len %u/%u.\n",
- __func__, datalen, dlen);
- return -EINVAL;
- }
- sgoffset = 0;
- sglen = sg->length;
- page = sg_page(sg);
-
- }
- copy = min(datalen, sglen);
- if (i && page == frags[i - 1].page &&
- sgoffset + sg->offset ==
- frags[i - 1].page_offset + frags[i - 1].size) {
- frags[i - 1].size += copy;
- } else {
- if (i >= frag_max) {
- cxgb3i_log_error("%s, too many pages %u, "
- "dlen %u.\n", __func__,
- frag_max, dlen);
- return -EINVAL;
- }
-
- frags[i].page = page;
- frags[i].page_offset = sg->offset + sgoffset;
- frags[i].size = copy;
- i++;
- }
- datalen -= copy;
- sgoffset += copy;
- sglen -= copy;
- } while (datalen);
-
- return i;
-}
-
-int cxgb3i_conn_alloc_pdu(struct iscsi_task *task, u8 opcode)
-{
- struct iscsi_conn *conn = task->conn;
- struct iscsi_tcp_task *tcp_task = task->dd_data;
- struct cxgb3i_task_data *tdata = task->dd_data + sizeof(*tcp_task);
- struct scsi_cmnd *sc = task->sc;
- int headroom = SKB_TX_PDU_HEADER_LEN;
-
- tcp_task->dd_data = tdata;
- task->hdr = NULL;
-
- /* write command, need to send data pdus */
- if (skb_extra_headroom && (opcode == ISCSI_OP_SCSI_DATA_OUT ||
- (opcode == ISCSI_OP_SCSI_CMD &&
- (scsi_bidi_cmnd(sc) || sc->sc_data_direction == DMA_TO_DEVICE))))
- headroom += min(skb_extra_headroom, conn->max_xmit_dlength);
-
- tdata->skb = alloc_skb(TX_HEADER_LEN + headroom, GFP_ATOMIC);
- if (!tdata->skb)
- return -ENOMEM;
- skb_reserve(tdata->skb, TX_HEADER_LEN);
-
- cxgb3i_tx_debug("task 0x%p, opcode 0x%x, skb 0x%p.\n",
- task, opcode, tdata->skb);
-
- task->hdr = (struct iscsi_hdr *)tdata->skb->data;
- task->hdr_max = SKB_TX_PDU_HEADER_LEN;
-
- /* data_out uses scsi_cmd's itt */
- if (opcode != ISCSI_OP_SCSI_DATA_OUT)
- cxgb3i_reserve_itt(task, &task->hdr->itt);
-
- return 0;
-}
-
-int cxgb3i_conn_init_pdu(struct iscsi_task *task, unsigned int offset,
- unsigned int count)
-{
- struct iscsi_conn *conn = task->conn;
- struct iscsi_tcp_task *tcp_task = task->dd_data;
- struct cxgb3i_task_data *tdata = tcp_task->dd_data;
- struct sk_buff *skb = tdata->skb;
- unsigned int datalen = count;
- int i, padlen = iscsi_padding(count);
- struct page *pg;
-
- cxgb3i_tx_debug("task 0x%p,0x%p, offset %u, count %u, skb 0x%p.\n",
- task, task->sc, offset, count, skb);
-
- skb_put(skb, task->hdr_len);
- tx_skb_setmode(skb, conn->hdrdgst_en, datalen ? conn->datadgst_en : 0);
- if (!count)
- return 0;
-
- if (task->sc) {
- struct scsi_data_buffer *sdb = scsi_out(task->sc);
- struct scatterlist *sg = NULL;
- int err;
-
- tdata->offset = offset;
- tdata->count = count;
- err = sgl_seek_offset(sdb->table.sgl, sdb->table.nents,
- tdata->offset, &tdata->sgoffset, &sg);
- if (err < 0) {
- cxgb3i_log_warn("tpdu, sgl %u, bad offset %u/%u.\n",
- sdb->table.nents, tdata->offset,
- sdb->length);
- return err;
- }
- err = sgl_read_to_frags(sg, tdata->sgoffset, tdata->count,
- tdata->frags, MAX_PDU_FRAGS);
- if (err < 0) {
- cxgb3i_log_warn("tpdu, sgl %u, bad offset %u + %u.\n",
- sdb->table.nents, tdata->offset,
- tdata->count);
- return err;
- }
- tdata->nr_frags = err;
-
- if (tdata->nr_frags > MAX_SKB_FRAGS ||
- (padlen && tdata->nr_frags == MAX_SKB_FRAGS)) {
- char *dst = skb->data + task->hdr_len;
- skb_frag_t *frag = tdata->frags;
-
- /* data fits in the skb's headroom */
- for (i = 0; i < tdata->nr_frags; i++, frag++) {
- char *src = kmap_atomic(frag->page,
- KM_SOFTIRQ0);
-
- memcpy(dst, src+frag->page_offset, frag->size);
- dst += frag->size;
- kunmap_atomic(src, KM_SOFTIRQ0);
- }
- if (padlen) {
- memset(dst, 0, padlen);
- padlen = 0;
- }
- skb_put(skb, count + padlen);
- } else {
- /* data fit into frag_list */
- for (i = 0; i < tdata->nr_frags; i++)
- get_page(tdata->frags[i].page);
-
- memcpy(skb_shinfo(skb)->frags, tdata->frags,
- sizeof(skb_frag_t) * tdata->nr_frags);
- skb_shinfo(skb)->nr_frags = tdata->nr_frags;
- skb->len += count;
- skb->data_len += count;
- skb->truesize += count;
- }
-
- } else {
- pg = virt_to_page(task->data);
-
- get_page(pg);
- skb_fill_page_desc(skb, 0, pg, offset_in_page(task->data),
- count);
- skb->len += count;
- skb->data_len += count;
- skb->truesize += count;
- }
-
- if (padlen) {
- i = skb_shinfo(skb)->nr_frags;
- get_page(pad_page);
- skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, pad_page, 0,
- padlen);
-
- skb->data_len += padlen;
- skb->truesize += padlen;
- skb->len += padlen;
- }
-
- return 0;
-}
-
-int cxgb3i_conn_xmit_pdu(struct iscsi_task *task)
-{
- struct iscsi_tcp_conn *tcp_conn = task->conn->dd_data;
- struct cxgb3i_conn *cconn = tcp_conn->dd_data;
- struct iscsi_tcp_task *tcp_task = task->dd_data;
- struct cxgb3i_task_data *tdata = tcp_task->dd_data;
- struct sk_buff *skb = tdata->skb;
- unsigned int datalen;
- int err;
-
- if (!skb)
- return 0;
-
- datalen = skb->data_len;
- tdata->skb = NULL;
- err = cxgb3i_c3cn_send_pdus(cconn->cep->c3cn, skb);
- if (err > 0) {
- int pdulen = err;
-
- cxgb3i_tx_debug("task 0x%p, skb 0x%p, len %u/%u, rv %d.\n",
- task, skb, skb->len, skb->data_len, err);
-
- if (task->conn->hdrdgst_en)
- pdulen += ISCSI_DIGEST_SIZE;
- if (datalen && task->conn->datadgst_en)
- pdulen += ISCSI_DIGEST_SIZE;
-
- task->conn->txdata_octets += pdulen;
- return 0;
- }
-
- if (err == -EAGAIN || err == -ENOBUFS) {
- /* reset skb to send when we are called again */
- tdata->skb = skb;
- return err;
- }
-
- kfree_skb(skb);
- cxgb3i_tx_debug("itt 0x%x, skb 0x%p, len %u/%u, xmit err %d.\n",
- task->itt, skb, skb->len, skb->data_len, err);
- iscsi_conn_printk(KERN_ERR, task->conn, "xmit err %d.\n", err);
- iscsi_conn_failure(task->conn, ISCSI_ERR_XMIT_FAILED);
- return err;
-}
-
-int cxgb3i_pdu_init(void)
-{
- if (SKB_TX_HEADROOM > (512 * MAX_SKB_FRAGS))
- skb_extra_headroom = SKB_TX_HEADROOM;
- pad_page = alloc_page(GFP_KERNEL);
- if (!pad_page)
- return -ENOMEM;
- memset(page_address(pad_page), 0, PAGE_SIZE);
- return 0;
-}
-
-void cxgb3i_pdu_cleanup(void)
-{
- if (pad_page) {
- __free_page(pad_page);
- pad_page = NULL;
- }
-}
-
-void cxgb3i_conn_pdu_ready(struct s3_conn *c3cn)
-{
- struct sk_buff *skb;
- unsigned int read = 0;
- struct iscsi_conn *conn = c3cn->user_data;
- int err = 0;
-
- cxgb3i_rx_debug("cn 0x%p.\n", c3cn);
-
- read_lock(&c3cn->callback_lock);
- if (unlikely(!conn || conn->suspend_rx)) {
- cxgb3i_rx_debug("conn 0x%p, id %d, suspend_rx %lu!\n",
- conn, conn ? conn->id : 0xFF,
- conn ? conn->suspend_rx : 0xFF);
- read_unlock(&c3cn->callback_lock);
- return;
- }
- skb = skb_peek(&c3cn->receive_queue);
- while (!err && skb) {
- __skb_unlink(skb, &c3cn->receive_queue);
- read += skb_rx_pdulen(skb);
- cxgb3i_rx_debug("conn 0x%p, cn 0x%p, rx skb 0x%p, pdulen %u.\n",
- conn, c3cn, skb, skb_rx_pdulen(skb));
- err = cxgb3i_conn_read_pdu_skb(conn, skb);
- __kfree_skb(skb);
- skb = skb_peek(&c3cn->receive_queue);
- }
- read_unlock(&c3cn->callback_lock);
- c3cn->copied_seq += read;
- cxgb3i_c3cn_rx_credits(c3cn, read);
- conn->rxdata_octets += read;
-
- if (err) {
- cxgb3i_log_info("conn 0x%p rx failed err %d.\n", conn, err);
- iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
- }
-}
-
-void cxgb3i_conn_tx_open(struct s3_conn *c3cn)
-{
- struct iscsi_conn *conn = c3cn->user_data;
-
- cxgb3i_tx_debug("cn 0x%p.\n", c3cn);
- if (conn) {
- cxgb3i_tx_debug("cn 0x%p, cid %d.\n", c3cn, conn->id);
- iscsi_conn_queue_work(conn);
- }
-}
-
-void cxgb3i_conn_closing(struct s3_conn *c3cn)
-{
- struct iscsi_conn *conn;
-
- read_lock(&c3cn->callback_lock);
- conn = c3cn->user_data;
- if (conn && c3cn->state != C3CN_STATE_ESTABLISHED)
- iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
- read_unlock(&c3cn->callback_lock);
-}
+++ /dev/null
-/*
- * cxgb3i_ulp2.h: Chelsio S3xx iSCSI driver.
- *
- * Copyright (c) 2008 Chelsio Communications, Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation.
- *
- * Written by: Karen Xie (kxie@chelsio.com)
- */
-
-#ifndef __CXGB3I_ULP2_PDU_H__
-#define __CXGB3I_ULP2_PDU_H__
-
-struct cpl_iscsi_hdr_norss {
- union opcode_tid ot;
- u16 pdu_len_ddp;
- u16 len;
- u32 seq;
- u16 urg;
- u8 rsvd;
- u8 status;
-};
-
-struct cpl_rx_data_ddp_norss {
- union opcode_tid ot;
- u16 urg;
- u16 len;
- u32 seq;
- u32 nxt_seq;
- u32 ulp_crc;
- u32 ddp_status;
-};
-
-#define RX_DDP_STATUS_IPP_SHIFT 27 /* invalid pagepod */
-#define RX_DDP_STATUS_TID_SHIFT 26 /* tid mismatch */
-#define RX_DDP_STATUS_COLOR_SHIFT 25 /* color mismatch */
-#define RX_DDP_STATUS_OFFSET_SHIFT 24 /* offset mismatch */
-#define RX_DDP_STATUS_ULIMIT_SHIFT 23 /* ulimit error */
-#define RX_DDP_STATUS_TAG_SHIFT 22 /* tag mismatch */
-#define RX_DDP_STATUS_DCRC_SHIFT 21 /* dcrc error */
-#define RX_DDP_STATUS_HCRC_SHIFT 20 /* hcrc error */
-#define RX_DDP_STATUS_PAD_SHIFT 19 /* pad error */
-#define RX_DDP_STATUS_PPP_SHIFT 18 /* pagepod parity error */
-#define RX_DDP_STATUS_LLIMIT_SHIFT 17 /* llimit error */
-#define RX_DDP_STATUS_DDP_SHIFT 16 /* ddp'able */
-#define RX_DDP_STATUS_PMM_SHIFT 15 /* pagepod mismatch */
-
-#define ULP2_FLAG_DATA_READY 0x1
-#define ULP2_FLAG_DATA_DDPED 0x2
-#define ULP2_FLAG_HCRC_ERROR 0x10
-#define ULP2_FLAG_DCRC_ERROR 0x20
-#define ULP2_FLAG_PAD_ERROR 0x40
-
-void cxgb3i_conn_closing(struct s3_conn *c3cn);
-void cxgb3i_conn_pdu_ready(struct s3_conn *c3cn);
-void cxgb3i_conn_tx_open(struct s3_conn *c3cn);
-#endif
+source "drivers/scsi/cxgbi/cxgb3i/Kconfig"
source "drivers/scsi/cxgbi/cxgb4i/Kconfig"
+obj-$(CONFIG_SCSI_CXGB3_ISCSI) += libcxgbi.o cxgb3i/
obj-$(CONFIG_SCSI_CXGB4_ISCSI) += libcxgbi.o cxgb4i/
--- /dev/null
+EXTRA_CFLAGS += -I$(srctree)/drivers/net/cxgb3
+
+obj-$(CONFIG_SCSI_CXGB3_ISCSI) += cxgb3i.o
--- /dev/null
+config SCSI_CXGB3_ISCSI
+ tristate "Chelsio T3 iSCSI support"
+ depends on CHELSIO_T3_DEPENDS
+ select CHELSIO_T3
+ select SCSI_ISCSI_ATTRS
+ ---help---
+ This driver supports iSCSI offload for the Chelsio T3 devices.
--- /dev/null
+/*
+ * cxgb3i_offload.c: Chelsio S3xx iscsi offloaded tcp connection management
+ *
+ * Copyright (C) 2003-2008 Chelsio Communications. All rights reserved.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the LICENSE file included in this
+ * release for licensing terms and conditions.
+ *
+ * Written by: Dimitris Michailidis (dm@chelsio.com)
+ * Karen Xie (kxie@chelsio.com)
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
+
+#include <linux/version.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <scsi/scsi_host.h>
+
+#include "common.h"
+#include "t3_cpl.h"
+#include "t3cdev.h"
+#include "cxgb3_defs.h"
+#include "cxgb3_ctl_defs.h"
+#include "cxgb3_offload.h"
+#include "firmware_exports.h"
+#include "cxgb3i.h"
+
+static unsigned int dbg_level;
+#include "../libcxgbi.h"
+
+#define DRV_MODULE_NAME "cxgb3i"
+#define DRV_MODULE_DESC "Chelsio T3 iSCSI Driver"
+#define DRV_MODULE_VERSION "2.0.0"
+#define DRV_MODULE_RELDATE "Jun. 2010"
+
+static char version[] =
+ DRV_MODULE_DESC " " DRV_MODULE_NAME
+ " v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
+
+MODULE_AUTHOR("Chelsio Communications, Inc.");
+MODULE_DESCRIPTION(DRV_MODULE_DESC);
+MODULE_VERSION(DRV_MODULE_VERSION);
+MODULE_LICENSE("GPL");
+
+module_param(dbg_level, uint, 0644);
+MODULE_PARM_DESC(dbg_level, "debug flag (default=0)");
+
+static int cxgb3i_rcv_win = 256 * 1024;
+module_param(cxgb3i_rcv_win, int, 0644);
+MODULE_PARM_DESC(cxgb3i_rcv_win, "TCP receive window in bytes (default=256KB)");
+
+static int cxgb3i_snd_win = 128 * 1024;
+module_param(cxgb3i_snd_win, int, 0644);
+MODULE_PARM_DESC(cxgb3i_snd_win, "TCP send window in bytes (default=128KB)");
+
+static int cxgb3i_rx_credit_thres = 10 * 1024;
+module_param(cxgb3i_rx_credit_thres, int, 0644);
+MODULE_PARM_DESC(rx_credit_thres,
+ "RX credits return threshold in bytes (default=10KB)");
+
+static unsigned int cxgb3i_max_connect = 8 * 1024;
+module_param(cxgb3i_max_connect, uint, 0644);
+MODULE_PARM_DESC(cxgb3i_max_connect, "Max. # of connections (default=8092)");
+
+static unsigned int cxgb3i_sport_base = 20000;
+module_param(cxgb3i_sport_base, uint, 0644);
+MODULE_PARM_DESC(cxgb3i_sport_base, "starting port number (default=20000)");
+
+static void cxgb3i_dev_open(struct t3cdev *);
+static void cxgb3i_dev_close(struct t3cdev *);
+static void cxgb3i_dev_event_handler(struct t3cdev *, u32, u32);
+
+static struct cxgb3_client t3_client = {
+ .name = DRV_MODULE_NAME,
+ .handlers = cxgb3i_cpl_handlers,
+ .add = cxgb3i_dev_open,
+ .remove = cxgb3i_dev_close,
+ .event_handler = cxgb3i_dev_event_handler,
+};
+
+static struct scsi_host_template cxgb3i_host_template = {
+ .module = THIS_MODULE,
+ .name = DRV_MODULE_NAME,
+ .proc_name = DRV_MODULE_NAME,
+ .can_queue = CXGB3I_SCSI_HOST_QDEPTH,
+ .queuecommand = iscsi_queuecommand,
+ .change_queue_depth = iscsi_change_queue_depth,
+ .sg_tablesize = SG_ALL,
+ .max_sectors = 0xFFFF,
+ .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN,
+ .eh_abort_handler = iscsi_eh_abort,
+ .eh_device_reset_handler = iscsi_eh_device_reset,
+ .eh_target_reset_handler = iscsi_eh_recover_target,
+ .target_alloc = iscsi_target_alloc,
+ .use_clustering = DISABLE_CLUSTERING,
+ .this_id = -1,
+};
+
+static struct iscsi_transport cxgb3i_iscsi_transport = {
+ .owner = THIS_MODULE,
+ .name = DRV_MODULE_NAME,
+ /* owner and name should be set already */
+ .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
+ | CAP_DATADGST | CAP_DIGEST_OFFLOAD |
+ CAP_PADDING_OFFLOAD,
+ .param_mask = ISCSI_MAX_RECV_DLENGTH | ISCSI_MAX_XMIT_DLENGTH |
+ ISCSI_HDRDGST_EN | ISCSI_DATADGST_EN |
+ ISCSI_INITIAL_R2T_EN | ISCSI_MAX_R2T |
+ ISCSI_IMM_DATA_EN | ISCSI_FIRST_BURST |
+ ISCSI_MAX_BURST | ISCSI_PDU_INORDER_EN |
+ ISCSI_DATASEQ_INORDER_EN | ISCSI_ERL |
+ ISCSI_CONN_PORT | ISCSI_CONN_ADDRESS |
+ ISCSI_EXP_STATSN | ISCSI_PERSISTENT_PORT |
+ ISCSI_PERSISTENT_ADDRESS |
+ ISCSI_TARGET_NAME | ISCSI_TPGT |
+ ISCSI_USERNAME | ISCSI_PASSWORD |
+ ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
+ ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
+ ISCSI_LU_RESET_TMO | ISCSI_TGT_RESET_TMO |
+ ISCSI_PING_TMO | ISCSI_RECV_TMO |
+ ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
+ .host_param_mask = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
+ ISCSI_HOST_INITIATOR_NAME |
+ ISCSI_HOST_NETDEV_NAME,
+ .get_host_param = cxgbi_get_host_param,
+ .set_host_param = cxgbi_set_host_param,
+ /* session management */
+ .create_session = cxgbi_create_session,
+ .destroy_session = cxgbi_destroy_session,
+ .get_session_param = iscsi_session_get_param,
+ /* connection management */
+ .create_conn = cxgbi_create_conn,
+ .bind_conn = cxgbi_bind_conn,
+ .destroy_conn = iscsi_tcp_conn_teardown,
+ .start_conn = iscsi_conn_start,
+ .stop_conn = iscsi_conn_stop,
+ .get_conn_param = cxgbi_get_conn_param,
+ .set_param = cxgbi_set_conn_param,
+ .get_stats = cxgbi_get_conn_stats,
+ /* pdu xmit req from user space */
+ .send_pdu = iscsi_conn_send_pdu,
+ /* task */
+ .init_task = iscsi_tcp_task_init,
+ .xmit_task = iscsi_tcp_task_xmit,
+ .cleanup_task = cxgbi_cleanup_task,
+ /* pdu */
+ .alloc_pdu = cxgbi_conn_alloc_pdu,
+ .init_pdu = cxgbi_conn_init_pdu,
+ .xmit_pdu = cxgbi_conn_xmit_pdu,
+ .parse_pdu_itt = cxgbi_parse_pdu_itt,
+ /* TCP connect/disconnect */
+ .ep_connect = cxgbi_ep_connect,
+ .ep_poll = cxgbi_ep_poll,
+ .ep_disconnect = cxgbi_ep_disconnect,
+ /* Error recovery timeout call */
+ .session_recovery_timedout = iscsi_session_recovery_timedout,
+};
+
+static struct scsi_transport_template *cxgb3i_stt;
+
+/*
+ * CPL (Chelsio Protocol Language) defines a message passing interface between
+ * the host driver and Chelsio asic.
+ * The section below implments CPLs that related to iscsi tcp connection
+ * open/close/abort and data send/receive.
+ */
+
+static int push_tx_frames(struct cxgbi_sock *csk, int req_completion);
+
+static void send_act_open_req(struct cxgbi_sock *csk, struct sk_buff *skb,
+ const struct l2t_entry *e)
+{
+ unsigned int wscale = cxgbi_sock_compute_wscale(cxgb3i_rcv_win);
+ struct cpl_act_open_req *req = (struct cpl_act_open_req *)skb->head;
+
+ skb->priority = CPL_PRIORITY_SETUP;
+
+ req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
+ OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ACT_OPEN_REQ, csk->atid));
+ req->local_port = csk->saddr.sin_port;
+ req->peer_port = csk->daddr.sin_port;
+ req->local_ip = csk->saddr.sin_addr.s_addr;
+ req->peer_ip = csk->daddr.sin_addr.s_addr;
+
+ req->opt0h = htonl(V_KEEP_ALIVE(1) | F_TCAM_BYPASS |
+ V_WND_SCALE(wscale) | V_MSS_IDX(csk->mss_idx) |
+ V_L2T_IDX(e->idx) | V_TX_CHANNEL(e->smt_idx));
+ req->opt0l = htonl(V_ULP_MODE(ULP2_MODE_ISCSI) |
+ V_RCV_BUFSIZ(cxgb3i_rcv_win>>10));
+
+ log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+ "csk 0x%p,%u,0x%lx,%u, %pI4:%u-%pI4:%u, %u,%u,%u.\n",
+ csk, csk->state, csk->flags, csk->atid,
+ &req->local_ip, ntohs(req->local_port),
+ &req->peer_ip, ntohs(req->peer_port),
+ csk->mss_idx, e->idx, e->smt_idx);
+
+ l2t_send(csk->cdev->lldev, skb, csk->l2t);
+}
+
+static inline void act_open_arp_failure(struct t3cdev *dev, struct sk_buff *skb)
+{
+ cxgbi_sock_act_open_req_arp_failure(NULL, skb);
+}
+
+/*
+ * CPL connection close request: host ->
+ *
+ * Close a connection by sending a CPL_CLOSE_CON_REQ message and queue it to
+ * the write queue (i.e., after any unsent txt data).
+ */
+static void send_close_req(struct cxgbi_sock *csk)
+{
+ struct sk_buff *skb = csk->cpl_close;
+ struct cpl_close_con_req *req = (struct cpl_close_con_req *)skb->head;
+ unsigned int tid = csk->tid;
+
+ log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+ "csk 0x%p,%u,0x%lx,%u.\n",
+ csk, csk->state, csk->flags, csk->tid);
+
+ csk->cpl_close = NULL;
+ req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_CLOSE_CON));
+ req->wr.wr_lo = htonl(V_WR_TID(tid));
+ OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, tid));
+ req->rsvd = htonl(csk->write_seq);
+
+ cxgbi_sock_skb_entail(csk, skb);
+ if (csk->state >= CTP_ESTABLISHED)
+ push_tx_frames(csk, 1);
+}
+
+/*
+ * CPL connection abort request: host ->
+ *
+ * Send an ABORT_REQ message. Makes sure we do not send multiple ABORT_REQs
+ * for the same connection and also that we do not try to send a message
+ * after the connection has closed.
+ */
+static void abort_arp_failure(struct t3cdev *tdev, struct sk_buff *skb)
+{
+ struct cpl_abort_req *req = cplhdr(skb);
+
+ log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+ "t3dev 0x%p, tid %u, skb 0x%p.\n",
+ tdev, GET_TID(req), skb);
+ req->cmd = CPL_ABORT_NO_RST;
+ cxgb3_ofld_send(tdev, skb);
+}
+
+static void send_abort_req(struct cxgbi_sock *csk)
+{
+ struct sk_buff *skb = csk->cpl_abort_req;
+ struct cpl_abort_req *req;
+
+ if (unlikely(csk->state == CTP_ABORTING || !skb))
+ return;
+ cxgbi_sock_set_state(csk, CTP_ABORTING);
+ cxgbi_sock_set_flag(csk, CTPF_ABORT_RPL_PENDING);
+ /* Purge the send queue so we don't send anything after an abort. */
+ cxgbi_sock_purge_write_queue(csk);
+
+ csk->cpl_abort_req = NULL;
+ req = (struct cpl_abort_req *)skb->head;
+ skb->priority = CPL_PRIORITY_DATA;
+ set_arp_failure_handler(skb, abort_arp_failure);
+ req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_REQ));
+ req->wr.wr_lo = htonl(V_WR_TID(csk->tid));
+ OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_ABORT_REQ, csk->tid));
+ req->rsvd0 = htonl(csk->snd_nxt);
+ req->rsvd1 = !cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT);
+ req->cmd = CPL_ABORT_SEND_RST;
+
+ log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+ "csk 0x%p,%u,0x%lx,%u, snd_nxt %u, 0x%x.\n",
+ csk, csk->state, csk->flags, csk->tid, csk->snd_nxt,
+ req->rsvd1);
+
+ l2t_send(csk->cdev->lldev, skb, csk->l2t);
+}
+
+/*
+ * CPL connection abort reply: host ->
+ *
+ * Send an ABORT_RPL message in response of the ABORT_REQ received.
+ */
+static void send_abort_rpl(struct cxgbi_sock *csk, int rst_status)
+{
+ struct sk_buff *skb = csk->cpl_abort_rpl;
+ struct cpl_abort_rpl *rpl = (struct cpl_abort_rpl *)skb->head;
+
+ log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+ "csk 0x%p,%u,0x%lx,%u, status %d.\n",
+ csk, csk->state, csk->flags, csk->tid, rst_status);
+
+ csk->cpl_abort_rpl = NULL;
+ skb->priority = CPL_PRIORITY_DATA;
+ rpl->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_HOST_ABORT_CON_RPL));
+ rpl->wr.wr_lo = htonl(V_WR_TID(csk->tid));
+ OPCODE_TID(rpl) = htonl(MK_OPCODE_TID(CPL_ABORT_RPL, csk->tid));
+ rpl->cmd = rst_status;
+ cxgb3_ofld_send(csk->cdev->lldev, skb);
+}
+
+/*
+ * CPL connection rx data ack: host ->
+ * Send RX credits through an RX_DATA_ACK CPL message. Returns the number of
+ * credits sent.
+ */
+static u32 send_rx_credits(struct cxgbi_sock *csk, u32 credits)
+{
+ struct sk_buff *skb;
+ struct cpl_rx_data_ack *req;
+ u32 dack = F_RX_DACK_CHANGE | V_RX_DACK_MODE(1);
+
+ log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
+ "csk 0x%p,%u,0x%lx,%u, credit %u, dack %u.\n",
+ csk, csk->state, csk->flags, csk->tid, credits, dack);
+
+ skb = alloc_cpl(sizeof(*req), 0, GFP_ATOMIC);
+ if (!skb) {
+ pr_info("csk 0x%p, credit %u, OOM.\n", csk, credits);
+ return 0;
+ }
+ req = (struct cpl_rx_data_ack *)skb->head;
+ req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
+ OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_RX_DATA_ACK, csk->tid));
+ req->credit_dack = htonl(F_RX_DACK_CHANGE | V_RX_DACK_MODE(1) |
+ V_RX_CREDITS(credits));
+ skb->priority = CPL_PRIORITY_ACK;
+ cxgb3_ofld_send(csk->cdev->lldev, skb);
+ return credits;
+}
+
+/*
+ * CPL connection tx data: host ->
+ *
+ * Send iscsi PDU via TX_DATA CPL message. Returns the number of
+ * credits sent.
+ * Each TX_DATA consumes work request credit (wrs), so we need to keep track of
+ * how many we've used so far and how many are pending (i.e., yet ack'ed by T3).
+ */
+
+static unsigned int wrlen __read_mostly;
+static unsigned int skb_wrs[SKB_WR_LIST_SIZE] __read_mostly;
+
+static void init_wr_tab(unsigned int wr_len)
+{
+ int i;
+
+ if (skb_wrs[1]) /* already initialized */
+ return;
+ for (i = 1; i < SKB_WR_LIST_SIZE; i++) {
+ int sgl_len = (3 * i) / 2 + (i & 1);
+
+ sgl_len += 3;
+ skb_wrs[i] = (sgl_len <= wr_len
+ ? 1 : 1 + (sgl_len - 2) / (wr_len - 1));
+ }
+ wrlen = wr_len * 8;
+}
+
+static inline void make_tx_data_wr(struct cxgbi_sock *csk, struct sk_buff *skb,
+ int len, int req_completion)
+{
+ struct tx_data_wr *req;
+ struct l2t_entry *l2t = csk->l2t;
+
+ skb_reset_transport_header(skb);
+ req = (struct tx_data_wr *)__skb_push(skb, sizeof(*req));
+ req->wr_hi = htonl(V_WR_OP(FW_WROPCODE_OFLD_TX_DATA) |
+ (req_completion ? F_WR_COMPL : 0));
+ req->wr_lo = htonl(V_WR_TID(csk->tid));
+ /* len includes the length of any HW ULP additions */
+ req->len = htonl(len);
+ /* V_TX_ULP_SUBMODE sets both the mode and submode */
+ req->flags = htonl(V_TX_ULP_SUBMODE(cxgbi_skcb_ulp_mode(skb)) |
+ V_TX_SHOVE((skb_peek(&csk->write_queue) ? 0 : 1)));
+ req->sndseq = htonl(csk->snd_nxt);
+ req->param = htonl(V_TX_PORT(l2t->smt_idx));
+
+ if (!cxgbi_sock_flag(csk, CTPF_TX_DATA_SENT)) {
+ req->flags |= htonl(V_TX_ACK_PAGES(2) | F_TX_INIT |
+ V_TX_CPU_IDX(csk->rss_qid));
+ /* sendbuffer is in units of 32KB. */
+ req->param |= htonl(V_TX_SNDBUF(cxgb3i_snd_win >> 15));
+ cxgbi_sock_set_flag(csk, CTPF_TX_DATA_SENT);
+ }
+}
+
+/**
+ * push_tx_frames -- start transmit
+ * @c3cn: the offloaded connection
+ * @req_completion: request wr_ack or not
+ *
+ * Prepends TX_DATA_WR or CPL_CLOSE_CON_REQ headers to buffers waiting in a
+ * connection's send queue and sends them on to T3. Must be called with the
+ * connection's lock held. Returns the amount of send buffer space that was
+ * freed as a result of sending queued data to T3.
+ */
+
+static void arp_failure_skb_discard(struct t3cdev *dev, struct sk_buff *skb)
+{
+ kfree_skb(skb);
+}
+
+static int push_tx_frames(struct cxgbi_sock *csk, int req_completion)
+{
+ int total_size = 0;
+ struct sk_buff *skb;
+
+ if (unlikely(csk->state < CTP_ESTABLISHED ||
+ csk->state == CTP_CLOSE_WAIT_1 || csk->state >= CTP_ABORTING)) {
+ log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
+ "csk 0x%p,%u,0x%lx,%u, in closing state.\n",
+ csk, csk->state, csk->flags, csk->tid);
+ return 0;
+ }
+
+ while (csk->wr_cred && (skb = skb_peek(&csk->write_queue)) != NULL) {
+ int len = skb->len; /* length before skb_push */
+ int frags = skb_shinfo(skb)->nr_frags + (len != skb->data_len);
+ int wrs_needed = skb_wrs[frags];
+
+ if (wrs_needed > 1 && len + sizeof(struct tx_data_wr) <= wrlen)
+ wrs_needed = 1;
+
+ WARN_ON(frags >= SKB_WR_LIST_SIZE || wrs_needed < 1);
+
+ if (csk->wr_cred < wrs_needed) {
+ log_debug(1 << CXGBI_DBG_PDU_TX,
+ "csk 0x%p, skb len %u/%u, frag %u, wr %d<%u.\n",
+ csk, skb->len, skb->data_len, frags,
+ wrs_needed, csk->wr_cred);
+ break;
+ }
+
+ __skb_unlink(skb, &csk->write_queue);
+ skb->priority = CPL_PRIORITY_DATA;
+ skb->csum = wrs_needed; /* remember this until the WR_ACK */
+ csk->wr_cred -= wrs_needed;
+ csk->wr_una_cred += wrs_needed;
+ cxgbi_sock_enqueue_wr(csk, skb);
+
+ log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
+ "csk 0x%p, enqueue, skb len %u/%u, frag %u, wr %d, "
+ "left %u, unack %u.\n",
+ csk, skb->len, skb->data_len, frags, skb->csum,
+ csk->wr_cred, csk->wr_una_cred);
+
+ if (likely(cxgbi_skcb_test_flag(skb, SKCBF_TX_NEED_HDR))) {
+ if ((req_completion &&
+ csk->wr_una_cred == wrs_needed) ||
+ csk->wr_una_cred >= csk->wr_max_cred / 2) {
+ req_completion = 1;
+ csk->wr_una_cred = 0;
+ }
+ len += cxgbi_ulp_extra_len(cxgbi_skcb_ulp_mode(skb));
+ make_tx_data_wr(csk, skb, len, req_completion);
+ csk->snd_nxt += len;
+ cxgbi_skcb_clear_flag(skb, SKCBF_TX_NEED_HDR);
+ }
+ total_size += skb->truesize;
+ log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_TX,
+ "csk 0x%p, tid 0x%x, send skb 0x%p.\n",
+ csk, csk->tid, skb);
+ set_arp_failure_handler(skb, arp_failure_skb_discard);
+ l2t_send(csk->cdev->lldev, skb, csk->l2t);
+ }
+ return total_size;
+}
+
+/*
+ * Process a CPL_ACT_ESTABLISH message: -> host
+ * Updates connection state from an active establish CPL message. Runs with
+ * the connection lock held.
+ */
+
+static inline void free_atid(struct cxgbi_sock *csk)
+{
+ if (cxgbi_sock_flag(csk, CTPF_HAS_ATID)) {
+ cxgb3_free_atid(csk->cdev->lldev, csk->atid);
+ cxgbi_sock_clear_flag(csk, CTPF_HAS_ATID);
+ cxgbi_sock_put(csk);
+ }
+}
+
+static int do_act_establish(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
+{
+ struct cxgbi_sock *csk = ctx;
+ struct cpl_act_establish *req = cplhdr(skb);
+ unsigned int tid = GET_TID(req);
+ unsigned int atid = G_PASS_OPEN_TID(ntohl(req->tos_tid));
+ u32 rcv_isn = ntohl(req->rcv_isn); /* real RCV_ISN + 1 */
+
+ log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+ "atid 0x%x,tid 0x%x, csk 0x%p,%u,0x%lx, isn %u.\n",
+ atid, atid, csk, csk->state, csk->flags, rcv_isn);
+
+ cxgbi_sock_get(csk);
+ cxgbi_sock_set_flag(csk, CTPF_HAS_TID);
+ csk->tid = tid;
+ cxgb3_insert_tid(csk->cdev->lldev, &t3_client, csk, tid);
+
+ free_atid(csk);
+
+ csk->rss_qid = G_QNUM(ntohs(skb->csum));
+
+ spin_lock_bh(&csk->lock);
+ if (csk->retry_timer.function) {
+ del_timer(&csk->retry_timer);
+ csk->retry_timer.function = NULL;
+ }
+
+ if (unlikely(csk->state != CTP_ACTIVE_OPEN))
+ pr_info("csk 0x%p,%u,0x%lx,%u, got EST.\n",
+ csk, csk->state, csk->flags, csk->tid);
+
+ csk->copied_seq = csk->rcv_wup = csk->rcv_nxt = rcv_isn;
+ if (cxgb3i_rcv_win > (M_RCV_BUFSIZ << 10))
+ csk->rcv_wup -= cxgb3i_rcv_win - (M_RCV_BUFSIZ << 10);
+
+ cxgbi_sock_established(csk, ntohl(req->snd_isn), ntohs(req->tcp_opt));
+
+ if (unlikely(cxgbi_sock_flag(csk, CTPF_ACTIVE_CLOSE_NEEDED)))
+ /* upper layer has requested closing */
+ send_abort_req(csk);
+ else {
+ if (skb_queue_len(&csk->write_queue))
+ push_tx_frames(csk, 1);
+ cxgbi_conn_tx_open(csk);
+ }
+
+ spin_unlock_bh(&csk->lock);
+ __kfree_skb(skb);
+ return 0;
+}
+
+/*
+ * Process a CPL_ACT_OPEN_RPL message: -> host
+ * Handle active open failures.
+ */
+static int act_open_rpl_status_to_errno(int status)
+{
+ switch (status) {
+ case CPL_ERR_CONN_RESET:
+ return -ECONNREFUSED;
+ case CPL_ERR_ARP_MISS:
+ return -EHOSTUNREACH;
+ case CPL_ERR_CONN_TIMEDOUT:
+ return -ETIMEDOUT;
+ case CPL_ERR_TCAM_FULL:
+ return -ENOMEM;
+ case CPL_ERR_CONN_EXIST:
+ return -EADDRINUSE;
+ default:
+ return -EIO;
+ }
+}
+
+static void act_open_retry_timer(unsigned long data)
+{
+ struct sk_buff *skb;
+ struct cxgbi_sock *csk = (struct cxgbi_sock *)data;
+
+ log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+ "csk 0x%p,%u,0x%lx,%u.\n",
+ csk, csk->state, csk->flags, csk->tid);
+
+ cxgbi_sock_get(csk);
+ spin_lock_bh(&csk->lock);
+ skb = alloc_cpl(sizeof(struct cpl_act_open_req), 0, GFP_ATOMIC);
+ if (!skb)
+ cxgbi_sock_fail_act_open(csk, -ENOMEM);
+ else {
+ skb->sk = (struct sock *)csk;
+ set_arp_failure_handler(skb, act_open_arp_failure);
+ send_act_open_req(csk, skb, csk->l2t);
+ }
+ spin_unlock_bh(&csk->lock);
+ cxgbi_sock_put(csk);
+}
+
+static int do_act_open_rpl(struct t3cdev *tdev, struct sk_buff *skb, void *ctx)
+{
+ struct cxgbi_sock *csk = ctx;
+ struct cpl_act_open_rpl *rpl = cplhdr(skb);
+
+ log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+ "csk 0x%p,%u,0x%lx,%u, status %u.\n",
+ csk, csk->state, csk->flags, csk->atid, rpl->status);
+
+ if (rpl->status != CPL_ERR_TCAM_FULL &&
+ rpl->status != CPL_ERR_CONN_EXIST &&
+ rpl->status != CPL_ERR_ARP_MISS)
+ cxgb3_queue_tid_release(tdev, GET_TID(rpl));
+
+ cxgbi_sock_get(csk);
+ spin_lock_bh(&csk->lock);
+ if (rpl->status == CPL_ERR_CONN_EXIST &&
+ csk->retry_timer.function != act_open_retry_timer) {
+ csk->retry_timer.function = act_open_retry_timer;
+ mod_timer(&csk->retry_timer, jiffies + HZ / 2);
+ } else
+ cxgbi_sock_fail_act_open(csk,
+ act_open_rpl_status_to_errno(rpl->status));
+
+ spin_unlock_bh(&csk->lock);
+ cxgbi_sock_put(csk);
+ __kfree_skb(skb);
+ return 0;
+}
+
+/*
+ * Process PEER_CLOSE CPL messages: -> host
+ * Handle peer FIN.
+ */
+static int do_peer_close(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
+{
+ struct cxgbi_sock *csk = ctx;
+
+ log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+ "csk 0x%p,%u,0x%lx,%u.\n",
+ csk, csk->state, csk->flags, csk->tid);
+
+ cxgbi_sock_rcv_peer_close(csk);
+ __kfree_skb(skb);
+ return 0;
+}
+
+/*
+ * Process CLOSE_CONN_RPL CPL message: -> host
+ * Process a peer ACK to our FIN.
+ */
+static int do_close_con_rpl(struct t3cdev *cdev, struct sk_buff *skb,
+ void *ctx)
+{
+ struct cxgbi_sock *csk = ctx;
+ struct cpl_close_con_rpl *rpl = cplhdr(skb);
+
+ log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+ "csk 0x%p,%u,0x%lx,%u, snxt %u.\n",
+ csk, csk->state, csk->flags, csk->tid, ntohl(rpl->snd_nxt));
+
+ cxgbi_sock_rcv_close_conn_rpl(csk, ntohl(rpl->snd_nxt));
+ __kfree_skb(skb);
+ return 0;
+}
+
+/*
+ * Process ABORT_REQ_RSS CPL message: -> host
+ * Process abort requests. If we are waiting for an ABORT_RPL we ignore this
+ * request except that we need to reply to it.
+ */
+
+static int abort_status_to_errno(struct cxgbi_sock *csk, int abort_reason,
+ int *need_rst)
+{
+ switch (abort_reason) {
+ case CPL_ERR_BAD_SYN: /* fall through */
+ case CPL_ERR_CONN_RESET:
+ return csk->state > CTP_ESTABLISHED ?
+ -EPIPE : -ECONNRESET;
+ case CPL_ERR_XMIT_TIMEDOUT:
+ case CPL_ERR_PERSIST_TIMEDOUT:
+ case CPL_ERR_FINWAIT2_TIMEDOUT:
+ case CPL_ERR_KEEPALIVE_TIMEDOUT:
+ return -ETIMEDOUT;
+ default:
+ return -EIO;
+ }
+}
+
+static int do_abort_req(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
+{
+ const struct cpl_abort_req_rss *req = cplhdr(skb);
+ struct cxgbi_sock *csk = ctx;
+ int rst_status = CPL_ABORT_NO_RST;
+
+ log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+ "csk 0x%p,%u,0x%lx,%u.\n",
+ csk, csk->state, csk->flags, csk->tid);
+
+ if (req->status == CPL_ERR_RTX_NEG_ADVICE ||
+ req->status == CPL_ERR_PERSIST_NEG_ADVICE) {
+ goto done;
+ }
+
+ cxgbi_sock_get(csk);
+ spin_lock_bh(&csk->lock);
+
+ if (!cxgbi_sock_flag(csk, CTPF_ABORT_REQ_RCVD)) {
+ cxgbi_sock_set_flag(csk, CTPF_ABORT_REQ_RCVD);
+ cxgbi_sock_set_state(csk, CTP_ABORTING);
+ goto out;
+ }
+
+ cxgbi_sock_clear_flag(csk, CTPF_ABORT_REQ_RCVD);
+ send_abort_rpl(csk, rst_status);
+
+ if (!cxgbi_sock_flag(csk, CTPF_ABORT_RPL_PENDING)) {
+ csk->err = abort_status_to_errno(csk, req->status, &rst_status);
+ cxgbi_sock_closed(csk);
+ }
+
+out:
+ spin_unlock_bh(&csk->lock);
+ cxgbi_sock_put(csk);
+done:
+ __kfree_skb(skb);
+ return 0;
+}
+
+/*
+ * Process ABORT_RPL_RSS CPL message: -> host
+ * Process abort replies. We only process these messages if we anticipate
+ * them as the coordination between SW and HW in this area is somewhat lacking
+ * and sometimes we get ABORT_RPLs after we are done with the connection that
+ * originated the ABORT_REQ.
+ */
+static int do_abort_rpl(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
+{
+ struct cpl_abort_rpl_rss *rpl = cplhdr(skb);
+ struct cxgbi_sock *csk = ctx;
+
+ log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+ "status 0x%x, csk 0x%p, s %u, 0x%lx.\n",
+ rpl->status, csk, csk ? csk->state : 0,
+ csk ? csk->flags : 0UL);
+ /*
+ * Ignore replies to post-close aborts indicating that the abort was
+ * requested too late. These connections are terminated when we get
+ * PEER_CLOSE or CLOSE_CON_RPL and by the time the abort_rpl_rss
+ * arrives the TID is either no longer used or it has been recycled.
+ */
+ if (rpl->status == CPL_ERR_ABORT_FAILED)
+ goto rel_skb;
+ /*
+ * Sometimes we've already closed the connection, e.g., a post-close
+ * abort races with ABORT_REQ_RSS, the latter frees the connection
+ * expecting the ABORT_REQ will fail with CPL_ERR_ABORT_FAILED,
+ * but FW turns the ABORT_REQ into a regular one and so we get
+ * ABORT_RPL_RSS with status 0 and no connection.
+ */
+ if (csk)
+ cxgbi_sock_rcv_abort_rpl(csk);
+rel_skb:
+ __kfree_skb(skb);
+ return 0;
+}
+
+/*
+ * Process RX_ISCSI_HDR CPL message: -> host
+ * Handle received PDUs, the payload could be DDP'ed. If not, the payload
+ * follow after the bhs.
+ */
+static int do_iscsi_hdr(struct t3cdev *t3dev, struct sk_buff *skb, void *ctx)
+{
+ struct cxgbi_sock *csk = ctx;
+ struct cpl_iscsi_hdr *hdr_cpl = cplhdr(skb);
+ struct cpl_iscsi_hdr_norss data_cpl;
+ struct cpl_rx_data_ddp_norss ddp_cpl;
+ unsigned int hdr_len, data_len, status;
+ unsigned int len;
+ int err;
+
+ log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
+ "csk 0x%p,%u,0x%lx,%u, skb 0x%p,%u.\n",
+ csk, csk->state, csk->flags, csk->tid, skb, skb->len);
+
+ spin_lock_bh(&csk->lock);
+
+ if (unlikely(csk->state >= CTP_PASSIVE_CLOSE)) {
+ log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+ "csk 0x%p,%u,0x%lx,%u, bad state.\n",
+ csk, csk->state, csk->flags, csk->tid);
+ if (csk->state != CTP_ABORTING)
+ goto abort_conn;
+ else
+ goto discard;
+ }
+
+ cxgbi_skcb_tcp_seq(skb) = ntohl(hdr_cpl->seq);
+ cxgbi_skcb_flags(skb) = 0;
+
+ skb_reset_transport_header(skb);
+ __skb_pull(skb, sizeof(struct cpl_iscsi_hdr));
+
+ len = hdr_len = ntohs(hdr_cpl->len);
+ /* msg coalesce is off or not enough data received */
+ if (skb->len <= hdr_len) {
+ pr_err("%s: tid %u, CPL_ISCSI_HDR, skb len %u < %u.\n",
+ csk->cdev->ports[csk->port_id]->name, csk->tid,
+ skb->len, hdr_len);
+ goto abort_conn;
+ }
+ cxgbi_skcb_set_flag(skb, SKCBF_RX_COALESCED);
+
+ err = skb_copy_bits(skb, skb->len - sizeof(ddp_cpl), &ddp_cpl,
+ sizeof(ddp_cpl));
+ if (err < 0) {
+ pr_err("%s: tid %u, copy cpl_ddp %u-%zu failed %d.\n",
+ csk->cdev->ports[csk->port_id]->name, csk->tid,
+ skb->len, sizeof(ddp_cpl), err);
+ goto abort_conn;
+ }
+
+ cxgbi_skcb_set_flag(skb, SKCBF_RX_STATUS);
+ cxgbi_skcb_rx_pdulen(skb) = ntohs(ddp_cpl.len);
+ cxgbi_skcb_rx_ddigest(skb) = ntohl(ddp_cpl.ulp_crc);
+ status = ntohl(ddp_cpl.ddp_status);
+
+ log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
+ "csk 0x%p, skb 0x%p,%u, pdulen %u, status 0x%x.\n",
+ csk, skb, skb->len, cxgbi_skcb_rx_pdulen(skb), status);
+
+ if (status & (1 << CPL_RX_DDP_STATUS_HCRC_SHIFT))
+ cxgbi_skcb_set_flag(skb, SKCBF_RX_HCRC_ERR);
+ if (status & (1 << CPL_RX_DDP_STATUS_DCRC_SHIFT))
+ cxgbi_skcb_set_flag(skb, SKCBF_RX_DCRC_ERR);
+ if (status & (1 << CPL_RX_DDP_STATUS_PAD_SHIFT))
+ cxgbi_skcb_set_flag(skb, SKCBF_RX_PAD_ERR);
+
+ if (skb->len > (hdr_len + sizeof(ddp_cpl))) {
+ err = skb_copy_bits(skb, hdr_len, &data_cpl, sizeof(data_cpl));
+ if (err < 0) {
+ pr_err("%s: tid %u, cp %zu/%u failed %d.\n",
+ csk->cdev->ports[csk->port_id]->name,
+ csk->tid, sizeof(data_cpl), skb->len, err);
+ goto abort_conn;
+ }
+ data_len = ntohs(data_cpl.len);
+ log_debug(1 << CXGBI_DBG_DDP | 1 << CXGBI_DBG_PDU_RX,
+ "skb 0x%p, pdu not ddp'ed %u/%u, status 0x%x.\n",
+ skb, data_len, cxgbi_skcb_rx_pdulen(skb), status);
+ len += sizeof(data_cpl) + data_len;
+ } else if (status & (1 << CPL_RX_DDP_STATUS_DDP_SHIFT))
+ cxgbi_skcb_set_flag(skb, SKCBF_RX_DATA_DDPD);
+
+ csk->rcv_nxt = ntohl(ddp_cpl.seq) + cxgbi_skcb_rx_pdulen(skb);
+ __pskb_trim(skb, len);
+ __skb_queue_tail(&csk->receive_queue, skb);
+ cxgbi_conn_pdu_ready(csk);
+
+ spin_unlock_bh(&csk->lock);
+ return 0;
+
+abort_conn:
+ send_abort_req(csk);
+discard:
+ spin_unlock_bh(&csk->lock);
+ __kfree_skb(skb);
+ return 0;
+}
+
+/*
+ * Process TX_DATA_ACK CPL messages: -> host
+ * Process an acknowledgment of WR completion. Advance snd_una and send the
+ * next batch of work requests from the write queue.
+ */
+static int do_wr_ack(struct t3cdev *cdev, struct sk_buff *skb, void *ctx)
+{
+ struct cxgbi_sock *csk = ctx;
+ struct cpl_wr_ack *hdr = cplhdr(skb);
+
+ log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_PDU_RX,
+ "csk 0x%p,%u,0x%lx,%u, cr %u.\n",
+ csk, csk->state, csk->flags, csk->tid, ntohs(hdr->credits));
+
+ cxgbi_sock_rcv_wr_ack(csk, ntohs(hdr->credits), ntohl(hdr->snd_una), 1);
+ __kfree_skb(skb);
+ return 0;
+}
+
+/*
+ * for each connection, pre-allocate skbs needed for close/abort requests. So
+ * that we can service the request right away.
+ */
+static int alloc_cpls(struct cxgbi_sock *csk)
+{
+ csk->cpl_close = alloc_cpl(sizeof(struct cpl_close_con_req), 0,
+ GFP_KERNEL);
+ if (!csk->cpl_close)
+ return -ENOMEM;
+ csk->cpl_abort_req = alloc_cpl(sizeof(struct cpl_abort_req), 0,
+ GFP_KERNEL);
+ if (!csk->cpl_abort_req)
+ goto free_cpl_skbs;
+
+ csk->cpl_abort_rpl = alloc_cpl(sizeof(struct cpl_abort_rpl), 0,
+ GFP_KERNEL);
+ if (!csk->cpl_abort_rpl)
+ goto free_cpl_skbs;
+
+ return 0;
+
+free_cpl_skbs:
+ cxgbi_sock_free_cpl_skbs(csk);
+ return -ENOMEM;
+}
+
+/**
+ * release_offload_resources - release offload resource
+ * @c3cn: the offloaded iscsi tcp connection.
+ * Release resources held by an offload connection (TID, L2T entry, etc.)
+ */
+static void l2t_put(struct cxgbi_sock *csk)
+{
+ struct t3cdev *t3dev = (struct t3cdev *)csk->cdev->lldev;
+
+ if (csk->l2t) {
+ l2t_release(L2DATA(t3dev), csk->l2t);
+ csk->l2t = NULL;
+ cxgbi_sock_put(csk);
+ }
+}
+
+static void release_offload_resources(struct cxgbi_sock *csk)
+{
+ struct t3cdev *t3dev = (struct t3cdev *)csk->cdev->lldev;
+
+ log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+ "csk 0x%p,%u,0x%lx,%u.\n",
+ csk, csk->state, csk->flags, csk->tid);
+
+ csk->rss_qid = 0;
+ cxgbi_sock_free_cpl_skbs(csk);
+
+ if (csk->wr_cred != csk->wr_max_cred) {
+ cxgbi_sock_purge_wr_queue(csk);
+ cxgbi_sock_reset_wr_list(csk);
+ }
+ l2t_put(csk);
+ if (cxgbi_sock_flag(csk, CTPF_HAS_ATID))
+ free_atid(csk);
+ else if (cxgbi_sock_flag(csk, CTPF_HAS_TID)) {
+ cxgb3_remove_tid(t3dev, (void *)csk, csk->tid);
+ cxgbi_sock_clear_flag(csk, CTPF_HAS_TID);
+ cxgbi_sock_put(csk);
+ }
+ csk->dst = NULL;
+ csk->cdev = NULL;
+}
+
+static int init_act_open(struct cxgbi_sock *csk)
+{
+ struct dst_entry *dst = csk->dst;
+ struct cxgbi_device *cdev = csk->cdev;
+ struct t3cdev *t3dev = (struct t3cdev *)cdev->lldev;
+ struct net_device *ndev = cdev->ports[csk->port_id];
+ struct sk_buff *skb = NULL;
+
+ log_debug(1 << CXGBI_DBG_TOE | 1 << CXGBI_DBG_SOCK,
+ "csk 0x%p,%u,0x%lx.\n", csk, csk->state, csk->flags);
+
+ csk->rss_qid = 0;
+ csk->l2t = t3_l2t_get(t3dev, dst->neighbour, ndev);
+ if (!csk->l2t) {
+ pr_err("NO l2t available.\n");
+ return -EINVAL;
+ }
+ cxgbi_sock_get(csk);
+
+ csk->atid = cxgb3_alloc_atid(t3dev, &t3_client, csk);
+ if (csk->atid < 0) {
+ pr_err("NO atid available.\n");
+ goto rel_resource;
+ }
+ cxgbi_sock_set_flag(csk, CTPF_HAS_ATID);
+ cxgbi_sock_get(csk);
+
+ skb = alloc_cpl(sizeof(struct cpl_act_open_req), 0, GFP_KERNEL);
+ if (!skb)
+ goto rel_resource;
+ skb->sk = (struct sock *)csk;
+ set_arp_failure_handler(skb, act_open_arp_failure);
+
+ csk->wr_max_cred = csk->wr_cred = T3C_DATA(t3dev)->max_wrs - 1;
+ csk->wr_una_cred = 0;
+ csk->mss_idx = cxgbi_sock_select_mss(csk, dst_mtu(dst));
+ cxgbi_sock_reset_wr_list(csk);
+ csk->err = 0;
+
+ cxgbi_sock_set_state(csk, CTP_ACTIVE_OPEN);
+ send_act_open_req(csk, skb, csk->l2t);
+ return 0;
+
+rel_resource:
+ if (skb)
+ __kfree_skb(skb);
+ return -EINVAL;
+}
+
+cxgb3_cpl_handler_func cxgb3i_cpl_handlers[NUM_CPL_CMDS] = {
+ [CPL_ACT_ESTABLISH] = do_act_establish,
+ [CPL_ACT_OPEN_RPL] = do_act_open_rpl,
+ [CPL_PEER_CLOSE] = do_peer_close,
+ [CPL_ABORT_REQ_RSS] = do_abort_req,
+ [CPL_ABORT_RPL_RSS] = do_abort_rpl,
+ [CPL_CLOSE_CON_RPL] = do_close_con_rpl,
+ [CPL_TX_DMA_ACK] = do_wr_ack,
+ [CPL_ISCSI_HDR] = do_iscsi_hdr,
+};
+
+/**
+ * cxgb3i_ofld_init - allocate and initialize resources for each adapter found
+ * @cdev: cxgbi adapter
+ */
+int cxgb3i_ofld_init(struct cxgbi_device *cdev)
+{
+ struct t3cdev *t3dev = (struct t3cdev *)cdev->lldev;
+ struct adap_ports port;
+ struct ofld_page_info rx_page_info;
+ unsigned int wr_len;
+ int rc;
+
+ if (t3dev->ctl(t3dev, GET_WR_LEN, &wr_len) < 0 ||
+ t3dev->ctl(t3dev, GET_PORTS, &port) < 0 ||
+ t3dev->ctl(t3dev, GET_RX_PAGE_INFO, &rx_page_info) < 0) {
+ pr_warn("t3 0x%p, offload up, ioctl failed.\n", t3dev);
+ return -EINVAL;
+ }
+
+ if (cxgb3i_max_connect > CXGBI_MAX_CONN)
+ cxgb3i_max_connect = CXGBI_MAX_CONN;
+
+ rc = cxgbi_device_portmap_create(cdev, cxgb3i_sport_base,
+ cxgb3i_max_connect);
+ if (rc < 0)
+ return rc;
+
+ init_wr_tab(wr_len);
+ cdev->csk_release_offload_resources = release_offload_resources;
+ cdev->csk_push_tx_frames = push_tx_frames;
+ cdev->csk_send_abort_req = send_abort_req;
+ cdev->csk_send_close_req = send_close_req;
+ cdev->csk_send_rx_credits = send_rx_credits;
+ cdev->csk_alloc_cpls = alloc_cpls;
+ cdev->csk_init_act_open = init_act_open;
+
+ pr_info("cdev 0x%p, offload up, added.\n", cdev);
+ return 0;
+}
+
+/*
+ * functions to program the pagepod in h/w
+ */
+static inline void ulp_mem_io_set_hdr(struct sk_buff *skb, unsigned int addr)
+{
+ struct ulp_mem_io *req = (struct ulp_mem_io *)skb->head;
+
+ memset(req, 0, sizeof(*req));
+
+ req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_BYPASS));
+ req->cmd_lock_addr = htonl(V_ULP_MEMIO_ADDR(addr >> 5) |
+ V_ULPTX_CMD(ULP_MEM_WRITE));
+ req->len = htonl(V_ULP_MEMIO_DATA_LEN(PPOD_SIZE >> 5) |
+ V_ULPTX_NFLITS((PPOD_SIZE >> 3) + 1));
+}
+
+static int ddp_set_map(struct cxgbi_sock *csk, struct cxgbi_pagepod_hdr *hdr,
+ unsigned int idx, unsigned int npods,
+ struct cxgbi_gather_list *gl)
+{
+ struct cxgbi_device *cdev = csk->cdev;
+ struct cxgbi_ddp_info *ddp = cdev->ddp;
+ unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
+ int i;
+
+ log_debug(1 << CXGBI_DBG_DDP,
+ "csk 0x%p, idx %u, npods %u, gl 0x%p.\n",
+ csk, idx, npods, gl);
+
+ for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
+ struct sk_buff *skb = ddp->gl_skb[idx];
+
+ /* hold on to the skb until we clear the ddp mapping */
+ skb_get(skb);
+
+ ulp_mem_io_set_hdr(skb, pm_addr);
+ cxgbi_ddp_ppod_set((struct cxgbi_pagepod *)(skb->head +
+ sizeof(struct ulp_mem_io)),
+ hdr, gl, i * PPOD_PAGES_MAX);
+ skb->priority = CPL_PRIORITY_CONTROL;
+ cxgb3_ofld_send(cdev->lldev, skb);
+ }
+ return 0;
+}
+
+static void ddp_clear_map(struct cxgbi_hba *chba, unsigned int tag,
+ unsigned int idx, unsigned int npods)
+{
+ struct cxgbi_device *cdev = chba->cdev;
+ struct cxgbi_ddp_info *ddp = cdev->ddp;
+ unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
+ int i;
+
+ log_debug(1 << CXGBI_DBG_DDP,
+ "cdev 0x%p, idx %u, npods %u, tag 0x%x.\n",
+ cdev, idx, npods, tag);
+
+ for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
+ struct sk_buff *skb = ddp->gl_skb[idx];
+
+ if (!skb) {
+ pr_err("tag 0x%x, 0x%x, %d/%u, skb NULL.\n",
+ tag, idx, i, npods);
+ continue;
+ }
+ ddp->gl_skb[idx] = NULL;
+ memset(skb->head + sizeof(struct ulp_mem_io), 0, PPOD_SIZE);
+ ulp_mem_io_set_hdr(skb, pm_addr);
+ skb->priority = CPL_PRIORITY_CONTROL;
+ cxgb3_ofld_send(cdev->lldev, skb);
+ }
+}
+
+static void ddp_free_gl_skb(struct cxgbi_ddp_info *ddp, int idx, int cnt)
+{
+ int i;
+
+ log_debug(1 << CXGBI_DBG_DDP,
+ "ddp 0x%p, idx %d, cnt %d.\n", ddp, idx, cnt);
+
+ for (i = 0; i < cnt; i++, idx++)
+ if (ddp->gl_skb[idx]) {
+ kfree_skb(ddp->gl_skb[idx]);
+ ddp->gl_skb[idx] = NULL;
+ }
+}
+
+static int ddp_alloc_gl_skb(struct cxgbi_ddp_info *ddp, int idx,
+ int cnt, gfp_t gfp)
+{
+ int i;
+
+ log_debug(1 << CXGBI_DBG_DDP,
+ "ddp 0x%p, idx %d, cnt %d.\n", ddp, idx, cnt);
+
+ for (i = 0; i < cnt; i++) {
+ struct sk_buff *skb = alloc_cpl(sizeof(struct ulp_mem_io) +
+ PPOD_SIZE, 0, gfp);
+ if (skb) {
+ ddp->gl_skb[idx + i] = skb;
+ } else {
+ ddp_free_gl_skb(ddp, idx, i);
+ return -ENOMEM;
+ }
+ }
+ return 0;
+}
+
+static int ddp_setup_conn_pgidx(struct cxgbi_sock *csk,
+ unsigned int tid, int pg_idx, bool reply)
+{
+ struct sk_buff *skb = alloc_cpl(sizeof(struct cpl_set_tcb_field), 0,
+ GFP_KERNEL);
+ struct cpl_set_tcb_field *req;
+ u64 val = pg_idx < DDP_PGIDX_MAX ? pg_idx : 0;
+
+ log_debug(1 << CXGBI_DBG_DDP,
+ "csk 0x%p, tid %u, pg_idx %d.\n", csk, tid, pg_idx);
+ if (!skb)
+ return -ENOMEM;
+
+ /* set up ulp submode and page size */
+ req = (struct cpl_set_tcb_field *)skb->head;
+ req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
+ OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
+ req->reply = V_NO_REPLY(reply ? 0 : 1);
+ req->cpu_idx = 0;
+ req->word = htons(31);
+ req->mask = cpu_to_be64(0xF0000000);
+ req->val = cpu_to_be64(val << 28);
+ skb->priority = CPL_PRIORITY_CONTROL;
+
+ cxgb3_ofld_send(csk->cdev->lldev, skb);
+ return 0;
+}
+
+/**
+ * cxgb3i_setup_conn_digest - setup conn. digest setting
+ * @csk: cxgb tcp socket
+ * @tid: connection id
+ * @hcrc: header digest enabled
+ * @dcrc: data digest enabled
+ * @reply: request reply from h/w
+ * set up the iscsi digest settings for a connection identified by tid
+ */
+static int ddp_setup_conn_digest(struct cxgbi_sock *csk, unsigned int tid,
+ int hcrc, int dcrc, int reply)
+{
+ struct sk_buff *skb = alloc_cpl(sizeof(struct cpl_set_tcb_field), 0,
+ GFP_KERNEL);
+ struct cpl_set_tcb_field *req;
+ u64 val = (hcrc ? 1 : 0) | (dcrc ? 2 : 0);
+
+ log_debug(1 << CXGBI_DBG_DDP,
+ "csk 0x%p, tid %u, crc %d,%d.\n", csk, tid, hcrc, dcrc);
+ if (!skb)
+ return -ENOMEM;
+
+ /* set up ulp submode and page size */
+ req = (struct cpl_set_tcb_field *)skb->head;
+ req->wr.wr_hi = htonl(V_WR_OP(FW_WROPCODE_FORWARD));
+ OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_SET_TCB_FIELD, tid));
+ req->reply = V_NO_REPLY(reply ? 0 : 1);
+ req->cpu_idx = 0;
+ req->word = htons(31);
+ req->mask = cpu_to_be64(0x0F000000);
+ req->val = cpu_to_be64(val << 24);
+ skb->priority = CPL_PRIORITY_CONTROL;
+
+ cxgb3_ofld_send(csk->cdev->lldev, skb);
+ return 0;
+}
+
+/**
+ * t3_ddp_cleanup - release the cxgb3 adapter's ddp resource
+ * @cdev: cxgb3i adapter
+ * release all the resource held by the ddp pagepod manager for a given
+ * adapter if needed
+ */
+
+static void t3_ddp_cleanup(struct cxgbi_device *cdev)
+{
+ struct t3cdev *tdev = (struct t3cdev *)cdev->lldev;
+
+ if (cxgbi_ddp_cleanup(cdev)) {
+ pr_info("t3dev 0x%p, ulp_iscsi no more user.\n", tdev);
+ tdev->ulp_iscsi = NULL;
+ }
+}
+
+/**
+ * ddp_init - initialize the cxgb3 adapter's ddp resource
+ * @cdev: cxgb3i adapter
+ * initialize the ddp pagepod manager for a given adapter
+ */
+static int cxgb3i_ddp_init(struct cxgbi_device *cdev)
+{
+ struct t3cdev *tdev = (struct t3cdev *)cdev->lldev;
+ struct cxgbi_ddp_info *ddp = tdev->ulp_iscsi;
+ struct ulp_iscsi_info uinfo;
+ unsigned int pgsz_factor[4];
+ int err;
+
+ if (ddp) {
+ kref_get(&ddp->refcnt);
+ pr_warn("t3dev 0x%p, ddp 0x%p already set up.\n",
+ tdev, tdev->ulp_iscsi);
+ cdev->ddp = ddp;
+ return -EALREADY;
+ }
+
+ err = tdev->ctl(tdev, ULP_ISCSI_GET_PARAMS, &uinfo);
+ if (err < 0) {
+ pr_err("%s, failed to get iscsi param err=%d.\n",
+ tdev->name, err);
+ return err;
+ }
+
+ err = cxgbi_ddp_init(cdev, uinfo.llimit, uinfo.ulimit,
+ uinfo.max_txsz, uinfo.max_rxsz);
+ if (err < 0)
+ return err;
+
+ ddp = cdev->ddp;
+
+ uinfo.tagmask = ddp->idx_mask << PPOD_IDX_SHIFT;
+ cxgbi_ddp_page_size_factor(pgsz_factor);
+ uinfo.ulimit = uinfo.llimit + (ddp->nppods << PPOD_SIZE_SHIFT);
+
+ err = tdev->ctl(tdev, ULP_ISCSI_SET_PARAMS, &uinfo);
+ if (err < 0) {
+ pr_warn("%s unable to set iscsi param err=%d, ddp disabled.\n",
+ tdev->name, err);
+ cxgbi_ddp_cleanup(cdev);
+ return err;
+ }
+ tdev->ulp_iscsi = ddp;
+
+ cdev->csk_ddp_free_gl_skb = ddp_free_gl_skb;
+ cdev->csk_ddp_alloc_gl_skb = ddp_alloc_gl_skb;
+ cdev->csk_ddp_setup_digest = ddp_setup_conn_digest;
+ cdev->csk_ddp_setup_pgidx = ddp_setup_conn_pgidx;
+ cdev->csk_ddp_set = ddp_set_map;
+ cdev->csk_ddp_clear = ddp_clear_map;
+
+ pr_info("tdev 0x%p, nppods %u, bits %u, mask 0x%x,0x%x pkt %u/%u, "
+ "%u/%u.\n",
+ tdev, ddp->nppods, ddp->idx_bits, ddp->idx_mask,
+ ddp->rsvd_tag_mask, ddp->max_txsz, uinfo.max_txsz,
+ ddp->max_rxsz, uinfo.max_rxsz);
+ return 0;
+}
+
+static void cxgb3i_dev_close(struct t3cdev *t3dev)
+{
+ struct cxgbi_device *cdev = cxgbi_device_find_by_lldev(t3dev);
+
+ if (!cdev || cdev->flags & CXGBI_FLAG_ADAPTER_RESET) {
+ pr_info("0x%p close, f 0x%x.\n", cdev, cdev ? cdev->flags : 0);
+ return;
+ }
+
+ cxgbi_device_unregister(cdev);
+}
+
+/**
+ * cxgb3i_dev_open - init a t3 adapter structure and any h/w settings
+ * @t3dev: t3cdev adapter
+ */
+static void cxgb3i_dev_open(struct t3cdev *t3dev)
+{
+ struct cxgbi_device *cdev = cxgbi_device_find_by_lldev(t3dev);
+ struct adapter *adapter = tdev2adap(t3dev);
+ int i, err;
+
+ if (cdev) {
+ pr_info("0x%p, updating.\n", cdev);
+ return;
+ }
+
+ cdev = cxgbi_device_register(0, adapter->params.nports);
+ if (!cdev) {
+ pr_warn("device 0x%p register failed.\n", t3dev);
+ return;
+ }
+
+ cdev->flags = CXGBI_FLAG_DEV_T3 | CXGBI_FLAG_IPV4_SET;
+ cdev->lldev = t3dev;
+ cdev->pdev = adapter->pdev;
+ cdev->ports = adapter->port;
+ cdev->nports = adapter->params.nports;
+ cdev->mtus = adapter->params.mtus;
+ cdev->nmtus = NMTUS;
+ cdev->snd_win = cxgb3i_snd_win;
+ cdev->rcv_win = cxgb3i_rcv_win;
+ cdev->rx_credit_thres = cxgb3i_rx_credit_thres;
+ cdev->skb_tx_rsvd = CXGB3I_TX_HEADER_LEN;
+ cdev->skb_rx_extra = sizeof(struct cpl_iscsi_hdr_norss);
+ cdev->dev_ddp_cleanup = t3_ddp_cleanup;
+ cdev->itp = &cxgb3i_iscsi_transport;
+
+ err = cxgb3i_ddp_init(cdev);
+ if (err) {
+ pr_info("0x%p ddp init failed\n", cdev);
+ goto err_out;
+ }
+
+ err = cxgb3i_ofld_init(cdev);
+ if (err) {
+ pr_info("0x%p offload init failed\n", cdev);
+ goto err_out;
+ }
+
+ err = cxgbi_hbas_add(cdev, CXGB3I_MAX_LUN, CXGBI_MAX_CONN,
+ &cxgb3i_host_template, cxgb3i_stt);
+ if (err)
+ goto err_out;
+
+ for (i = 0; i < cdev->nports; i++)
+ cdev->hbas[i]->ipv4addr =
+ cxgb3i_get_private_ipv4addr(cdev->ports[i]);
+
+ pr_info("cdev 0x%p, f 0x%x, t3dev 0x%p open, err %d.\n",
+ cdev, cdev ? cdev->flags : 0, t3dev, err);
+ return;
+
+err_out:
+ cxgbi_device_unregister(cdev);
+}
+
+static void cxgb3i_dev_event_handler(struct t3cdev *t3dev, u32 event, u32 port)
+{
+ struct cxgbi_device *cdev = cxgbi_device_find_by_lldev(t3dev);
+
+ log_debug(1 << CXGBI_DBG_TOE,
+ "0x%p, cdev 0x%p, event 0x%x, port 0x%x.\n",
+ t3dev, cdev, event, port);
+ if (!cdev)
+ return;
+
+ switch (event) {
+ case OFFLOAD_STATUS_DOWN:
+ cdev->flags |= CXGBI_FLAG_ADAPTER_RESET;
+ break;
+ case OFFLOAD_STATUS_UP:
+ cdev->flags &= ~CXGBI_FLAG_ADAPTER_RESET;
+ break;
+ }
+}
+
+/**
+ * cxgb3i_init_module - module init entry point
+ *
+ * initialize any driver wide global data structures and register itself
+ * with the cxgb3 module
+ */
+static int __init cxgb3i_init_module(void)
+{
+ int rc;
+
+ printk(KERN_INFO "%s", version);
+
+ rc = cxgbi_iscsi_init(&cxgb3i_iscsi_transport, &cxgb3i_stt);
+ if (rc < 0)
+ return rc;
+
+ cxgb3_register_client(&t3_client);
+ return 0;
+}
+
+/**
+ * cxgb3i_exit_module - module cleanup/exit entry point
+ *
+ * go through the driver hba list and for each hba, release any resource held.
+ * and unregisters iscsi transport and the cxgb3 module
+ */
+static void __exit cxgb3i_exit_module(void)
+{
+ cxgb3_unregister_client(&t3_client);
+ cxgbi_device_unregister_all(CXGBI_FLAG_DEV_T3);
+ cxgbi_iscsi_cleanup(&cxgb3i_iscsi_transport, &cxgb3i_stt);
+}
+
+module_init(cxgb3i_init_module);
+module_exit(cxgb3i_exit_module);
--- /dev/null
+/*
+ * cxgb3i.h: Chelsio S3xx iSCSI driver.
+ *
+ * Copyright (c) 2008 Chelsio Communications, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation.
+ *
+ * Written by: Karen Xie (kxie@chelsio.com)
+ */
+
+#ifndef __CXGB3I_H__
+#define __CXGB3I_H__
+
+#define CXGB3I_SCSI_HOST_QDEPTH 1024
+#define CXGB3I_MAX_LUN 512
+#define ISCSI_PDU_NONPAYLOAD_MAX \
+ (sizeof(struct iscsi_hdr) + ISCSI_MAX_AHS_SIZE + 2*ISCSI_DIGEST_SIZE)
+
+/*for TX: a skb must have a headroom of at least TX_HEADER_LEN bytes */
+#define CXGB3I_TX_HEADER_LEN \
+ (sizeof(struct tx_data_wr) + sizeof(struct sge_opaque_hdr))
+
+extern cxgb3_cpl_handler_func cxgb3i_cpl_handlers[NUM_CPL_CMDS];
+
+#define cxgb3i_get_private_ipv4addr(ndev) \
+ (((struct port_info *)(netdev_priv(ndev)))->iscsi_ipv4addr)
+#define cxgb3i_set_private_ipv4addr(ndev, addr) \
+ (((struct port_info *)(netdev_priv(ndev)))->iscsi_ipv4addr) = addr
+
+struct cpl_iscsi_hdr_norss {
+ union opcode_tid ot;
+ u16 pdu_len_ddp;
+ u16 len;
+ u32 seq;
+ u16 urg;
+ u8 rsvd;
+ u8 status;
+};
+
+struct cpl_rx_data_ddp_norss {
+ union opcode_tid ot;
+ u16 urg;
+ u16 len;
+ u32 seq;
+ u32 nxt_seq;
+ u32 ulp_crc;
+ u32 ddp_status;
+};
+#endif
projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / commitdiff