--- /dev/null
+/*
+ * Copyright (c) 2005 Cisco Systems. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * $Id: ib_srp.c 3932 2005-11-01 17:19:29Z roland $
+ */
+
+#include <linux/version.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/string.h>
+#include <linux/parser.h>
+#include <linux/random.h>
+
+#include <asm/atomic.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_dbg.h>
+#include <scsi/srp.h>
+
+#include <rdma/ib_cache.h>
+
+#include "ib_srp.h"
+
+#define DRV_NAME "ib_srp"
+#define PFX DRV_NAME ": "
+#define DRV_VERSION "0.2"
+#define DRV_RELDATE "November 1, 2005"
+
+MODULE_AUTHOR("Roland Dreier");
+MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
+ "v" DRV_VERSION " (" DRV_RELDATE ")");
+MODULE_LICENSE("Dual BSD/GPL");
+
+static int topspin_workarounds = 1;
+
+module_param(topspin_workarounds, int, 0444);
+MODULE_PARM_DESC(topspin_workarounds,
+ "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
+
+static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
+
+static void srp_add_one(struct ib_device *device);
+static void srp_remove_one(struct ib_device *device);
+static void srp_completion(struct ib_cq *cq, void *target_ptr);
+static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
+
+static struct ib_client srp_client = {
+ .name = "srp",
+ .add = srp_add_one,
+ .remove = srp_remove_one
+};
+
+static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
+{
+ return (struct srp_target_port *) host->hostdata;
+}
+
+static const char *srp_target_info(struct Scsi_Host *host)
+{
+ return host_to_target(host)->target_name;
+}
+
+static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
+ gfp_t gfp_mask,
+ enum dma_data_direction direction)
+{
+ struct srp_iu *iu;
+
+ iu = kmalloc(sizeof *iu, gfp_mask);
+ if (!iu)
+ goto out;
+
+ iu->buf = kzalloc(size, gfp_mask);
+ if (!iu->buf)
+ goto out_free_iu;
+
+ iu->dma = dma_map_single(host->dev->dma_device, iu->buf, size, direction);
+ if (dma_mapping_error(iu->dma))
+ goto out_free_buf;
+
+ iu->size = size;
+ iu->direction = direction;
+
+ return iu;
+
+out_free_buf:
+ kfree(iu->buf);
+out_free_iu:
+ kfree(iu);
+out:
+ return NULL;
+}
+
+static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
+{
+ if (!iu)
+ return;
+
+ dma_unmap_single(host->dev->dma_device, iu->dma, iu->size, iu->direction);
+ kfree(iu->buf);
+ kfree(iu);
+}
+
+static void srp_qp_event(struct ib_event *event, void *context)
+{
+ printk(KERN_ERR PFX "QP event %d\n", event->event);
+}
+
+static int srp_init_qp(struct srp_target_port *target,
+ struct ib_qp *qp)
+{
+ struct ib_qp_attr *attr;
+ int ret;
+
+ attr = kmalloc(sizeof *attr, GFP_KERNEL);
+ if (!attr)
+ return -ENOMEM;
+
+ ret = ib_find_cached_pkey(target->srp_host->dev,
+ target->srp_host->port,
+ be16_to_cpu(target->path.pkey),
+ &attr->pkey_index);
+ if (ret)
+ goto out;
+
+ attr->qp_state = IB_QPS_INIT;
+ attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
+ IB_ACCESS_REMOTE_WRITE);
+ attr->port_num = target->srp_host->port;
+
+ ret = ib_modify_qp(qp, attr,
+ IB_QP_STATE |
+ IB_QP_PKEY_INDEX |
+ IB_QP_ACCESS_FLAGS |
+ IB_QP_PORT);
+
+out:
+ kfree(attr);
+ return ret;
+}
+
+static int srp_create_target_ib(struct srp_target_port *target)
+{
+ struct ib_qp_init_attr *init_attr;
+ int ret;
+
+ init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
+ if (!init_attr)
+ return -ENOMEM;
+
+ target->cq = ib_create_cq(target->srp_host->dev, srp_completion,
+ NULL, target, SRP_CQ_SIZE);
+ if (IS_ERR(target->cq)) {
+ ret = PTR_ERR(target->cq);
+ goto out;
+ }
+
+ ib_req_notify_cq(target->cq, IB_CQ_NEXT_COMP);
+
+ init_attr->event_handler = srp_qp_event;
+ init_attr->cap.max_send_wr = SRP_SQ_SIZE;
+ init_attr->cap.max_recv_wr = SRP_RQ_SIZE;
+ init_attr->cap.max_recv_sge = 1;
+ init_attr->cap.max_send_sge = 1;
+ init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
+ init_attr->qp_type = IB_QPT_RC;
+ init_attr->send_cq = target->cq;
+ init_attr->recv_cq = target->cq;
+
+ target->qp = ib_create_qp(target->srp_host->pd, init_attr);
+ if (IS_ERR(target->qp)) {
+ ret = PTR_ERR(target->qp);
+ ib_destroy_cq(target->cq);
+ goto out;
+ }
+
+ ret = srp_init_qp(target, target->qp);
+ if (ret) {
+ ib_destroy_qp(target->qp);
+ ib_destroy_cq(target->cq);
+ goto out;
+ }
+
+out:
+ kfree(init_attr);
+ return ret;
+}
+
+static void srp_free_target_ib(struct srp_target_port *target)
+{
+ int i;
+
+ ib_destroy_qp(target->qp);
+ ib_destroy_cq(target->cq);
+
+ for (i = 0; i < SRP_RQ_SIZE; ++i)
+ srp_free_iu(target->srp_host, target->rx_ring[i]);
+ for (i = 0; i < SRP_SQ_SIZE + 1; ++i)
+ srp_free_iu(target->srp_host, target->tx_ring[i]);
+}
+
+static void srp_path_rec_completion(int status,
+ struct ib_sa_path_rec *pathrec,
+ void *target_ptr)
+{
+ struct srp_target_port *target = target_ptr;
+
+ target->status = status;
+ if (status)
+ printk(KERN_ERR PFX "Got failed path rec status %d\n", status);
+ else
+ target->path = *pathrec;
+ complete(&target->done);
+}
+
+static int srp_lookup_path(struct srp_target_port *target)
+{
+ target->path.numb_path = 1;
+
+ init_completion(&target->done);
+
+ target->path_query_id = ib_sa_path_rec_get(target->srp_host->dev,
+ target->srp_host->port,
+ &target->path,
+ IB_SA_PATH_REC_DGID |
+ IB_SA_PATH_REC_SGID |
+ IB_SA_PATH_REC_NUMB_PATH |
+ IB_SA_PATH_REC_PKEY,
+ SRP_PATH_REC_TIMEOUT_MS,
+ GFP_KERNEL,
+ srp_path_rec_completion,
+ target, &target->path_query);
+ if (target->path_query_id < 0)
+ return target->path_query_id;
+
+ wait_for_completion(&target->done);
+
+ if (target->status < 0)
+ printk(KERN_WARNING PFX "Path record query failed\n");
+
+ return target->status;
+}
+
+static int srp_send_req(struct srp_target_port *target)
+{
+ struct {
+ struct ib_cm_req_param param;
+ struct srp_login_req priv;
+ } *req = NULL;
+ int status;
+
+ req = kzalloc(sizeof *req, GFP_KERNEL);
+ if (!req)
+ return -ENOMEM;
+
+ req->param.primary_path = &target->path;
+ req->param.alternate_path = NULL;
+ req->param.service_id = target->service_id;
+ req->param.qp_num = target->qp->qp_num;
+ req->param.qp_type = target->qp->qp_type;
+ req->param.private_data = &req->priv;
+ req->param.private_data_len = sizeof req->priv;
+ req->param.flow_control = 1;
+
+ get_random_bytes(&req->param.starting_psn, 4);
+ req->param.starting_psn &= 0xffffff;
+
+ /*
+ * Pick some arbitrary defaults here; we could make these
+ * module parameters if anyone cared about setting them.
+ */
+ req->param.responder_resources = 4;
+ req->param.remote_cm_response_timeout = 20;
+ req->param.local_cm_response_timeout = 20;
+ req->param.retry_count = 7;
+ req->param.rnr_retry_count = 7;
+ req->param.max_cm_retries = 15;
+
+ req->priv.opcode = SRP_LOGIN_REQ;
+ req->priv.tag = 0;
+ req->priv.req_it_iu_len = cpu_to_be32(SRP_MAX_IU_LEN);
+ req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
+ SRP_BUF_FORMAT_INDIRECT);
+ memcpy(req->priv.initiator_port_id, target->srp_host->initiator_port_id, 16);
+ /*
+ * Topspin/Cisco SRP targets will reject our login unless we
+ * zero out the first 8 bytes of our initiator port ID. The
+ * second 8 bytes must be our local node GUID, but we always
+ * use that anyway.
+ */
+ if (topspin_workarounds && !memcmp(&target->ioc_guid, topspin_oui, 3)) {
+ printk(KERN_DEBUG PFX "Topspin/Cisco initiator port ID workaround "
+ "activated for target GUID %016llx\n",
+ (unsigned long long) be64_to_cpu(target->ioc_guid));
+ memset(req->priv.initiator_port_id, 0, 8);
+ }
+ memcpy(req->priv.target_port_id, &target->id_ext, 8);
+ memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
+
+ status = ib_send_cm_req(target->cm_id, &req->param);
+
+ kfree(req);
+
+ return status;
+}
+
+static void srp_disconnect_target(struct srp_target_port *target)
+{
+ /* XXX should send SRP_I_LOGOUT request */
+
+ init_completion(&target->done);
+ ib_send_cm_dreq(target->cm_id, NULL, 0);
+ wait_for_completion(&target->done);
+}
+
+static void srp_remove_work(void *target_ptr)
+{
+ struct srp_target_port *target = target_ptr;
+
+ spin_lock_irq(target->scsi_host->host_lock);
+ if (target->state != SRP_TARGET_DEAD) {
+ spin_unlock_irq(target->scsi_host->host_lock);
+ scsi_host_put(target->scsi_host);
+ return;
+ }
+ target->state = SRP_TARGET_REMOVED;
+ spin_unlock_irq(target->scsi_host->host_lock);
+
+ down(&target->srp_host->target_mutex);
+ list_del(&target->list);
+ up(&target->srp_host->target_mutex);
+
+ scsi_remove_host(target->scsi_host);
+ ib_destroy_cm_id(target->cm_id);
+ srp_free_target_ib(target);
+ scsi_host_put(target->scsi_host);
+ /* And another put to really free the target port... */
+ scsi_host_put(target->scsi_host);
+}
+
+static int srp_connect_target(struct srp_target_port *target)
+{
+ int ret;
+
+ ret = srp_lookup_path(target);
+ if (ret)
+ return ret;
+
+ while (1) {
+ init_completion(&target->done);
+ ret = srp_send_req(target);
+ if (ret)
+ return ret;
+ wait_for_completion(&target->done);
+
+ /*
+ * The CM event handling code will set status to
+ * SRP_PORT_REDIRECT if we get a port redirect REJ
+ * back, or SRP_DLID_REDIRECT if we get a lid/qp
+ * redirect REJ back.
+ */
+ switch (target->status) {
+ case 0:
+ return 0;
+
+ case SRP_PORT_REDIRECT:
+ ret = srp_lookup_path(target);
+ if (ret)
+ return ret;
+ break;
+
+ case SRP_DLID_REDIRECT:
+ break;
+
+ default:
+ return target->status;
+ }
+ }
+}
+
+static int srp_reconnect_target(struct srp_target_port *target)
+{
+ struct ib_cm_id *new_cm_id;
+ struct ib_qp_attr qp_attr;
+ struct srp_request *req;
+ struct ib_wc wc;
+ int ret;
+ int i;
+
+ spin_lock_irq(target->scsi_host->host_lock);
+ if (target->state != SRP_TARGET_LIVE) {
+ spin_unlock_irq(target->scsi_host->host_lock);
+ return -EAGAIN;
+ }
+ target->state = SRP_TARGET_CONNECTING;
+ spin_unlock_irq(target->scsi_host->host_lock);
+
+ srp_disconnect_target(target);
+ /*
+ * Now get a new local CM ID so that we avoid confusing the
+ * target in case things are really fouled up.
+ */
+ new_cm_id = ib_create_cm_id(target->srp_host->dev,
+ srp_cm_handler, target);
+ if (IS_ERR(new_cm_id)) {
+ ret = PTR_ERR(new_cm_id);
+ goto err;
+ }
+ ib_destroy_cm_id(target->cm_id);
+ target->cm_id = new_cm_id;
+
+ qp_attr.qp_state = IB_QPS_RESET;
+ ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
+ if (ret)
+ goto err;
+
+ ret = srp_init_qp(target, target->qp);
+ if (ret)
+ goto err;
+
+ while (ib_poll_cq(target->cq, 1, &wc) > 0)
+ ; /* nothing */
+
+ list_for_each_entry(req, &target->req_queue, list) {
+ req->scmnd->result = DID_RESET << 16;
+ req->scmnd->scsi_done(req->scmnd);
+ }
+
+ target->rx_head = 0;
+ target->tx_head = 0;
+ target->tx_tail = 0;
+ target->req_head = 0;
+ for (i = 0; i < SRP_SQ_SIZE - 1; ++i)
+ target->req_ring[i].next = i + 1;
+ target->req_ring[SRP_SQ_SIZE - 1].next = -1;
+ INIT_LIST_HEAD(&target->req_queue);
+
+ ret = srp_connect_target(target);
+ if (ret)
+ goto err;
+
+ spin_lock_irq(target->scsi_host->host_lock);
+ if (target->state == SRP_TARGET_CONNECTING) {
+ ret = 0;
+ target->state = SRP_TARGET_LIVE;
+ } else
+ ret = -EAGAIN;
+ spin_unlock_irq(target->scsi_host->host_lock);
+
+ return ret;
+
+err:
+ printk(KERN_ERR PFX "reconnect failed (%d), removing target port.\n", ret);
+
+ /*
+ * We couldn't reconnect, so kill our target port off.
+ * However, we have to defer the real removal because we might
+ * be in the context of the SCSI error handler now, which
+ * would deadlock if we call scsi_remove_host().
+ */
+ spin_lock_irq(target->scsi_host->host_lock);
+ if (target->state == SRP_TARGET_CONNECTING) {
+ target->state = SRP_TARGET_DEAD;
+ INIT_WORK(&target->work, srp_remove_work, target);
+ schedule_work(&target->work);
+ }
+ spin_unlock_irq(target->scsi_host->host_lock);
+
+ return ret;
+}
+
+static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
+ struct srp_request *req)
+{
+ struct srp_cmd *cmd = req->cmd->buf;
+ int len;
+ u8 fmt;
+
+ if (!scmnd->request_buffer || scmnd->sc_data_direction == DMA_NONE)
+ return sizeof (struct srp_cmd);
+
+ if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
+ scmnd->sc_data_direction != DMA_TO_DEVICE) {
+ printk(KERN_WARNING PFX "Unhandled data direction %d\n",
+ scmnd->sc_data_direction);
+ return -EINVAL;
+ }
+
+ if (scmnd->use_sg) {
+ struct scatterlist *scat = scmnd->request_buffer;
+ int n;
+ int i;
+
+ n = dma_map_sg(target->srp_host->dev->dma_device,
+ scat, scmnd->use_sg, scmnd->sc_data_direction);
+
+ if (n == 1) {
+ struct srp_direct_buf *buf = (void *) cmd->add_data;
+
+ fmt = SRP_DATA_DESC_DIRECT;
+
+ buf->va = cpu_to_be64(sg_dma_address(scat));
+ buf->key = cpu_to_be32(target->srp_host->mr->rkey);
+ buf->len = cpu_to_be32(sg_dma_len(scat));
+
+ len = sizeof (struct srp_cmd) +
+ sizeof (struct srp_direct_buf);
+ } else {
+ struct srp_indirect_buf *buf = (void *) cmd->add_data;
+ u32 datalen = 0;
+
+ fmt = SRP_DATA_DESC_INDIRECT;
+
+ if (scmnd->sc_data_direction == DMA_TO_DEVICE)
+ cmd->data_out_desc_cnt = n;
+ else
+ cmd->data_in_desc_cnt = n;
+
+ buf->table_desc.va = cpu_to_be64(req->cmd->dma +
+ sizeof *cmd +
+ sizeof *buf);
+ buf->table_desc.key =
+ cpu_to_be32(target->srp_host->mr->rkey);
+ buf->table_desc.len =
+ cpu_to_be32(n * sizeof (struct srp_direct_buf));
+
+ for (i = 0; i < n; ++i) {
+ buf->desc_list[i].va = cpu_to_be64(sg_dma_address(&scat[i]));
+ buf->desc_list[i].key =
+ cpu_to_be32(target->srp_host->mr->rkey);
+ buf->desc_list[i].len = cpu_to_be32(sg_dma_len(&scat[i]));
+
+ datalen += sg_dma_len(&scat[i]);
+ }
+
+ buf->len = cpu_to_be32(datalen);
+
+ len = sizeof (struct srp_cmd) +
+ sizeof (struct srp_indirect_buf) +
+ n * sizeof (struct srp_direct_buf);
+ }
+ } else {
+ struct srp_direct_buf *buf = (void *) cmd->add_data;
+ dma_addr_t dma;
+
+ dma = dma_map_single(target->srp_host->dev->dma_device,
+ scmnd->request_buffer, scmnd->request_bufflen,
+ scmnd->sc_data_direction);
+ if (dma_mapping_error(dma)) {
+ printk(KERN_WARNING PFX "unable to map %p/%d (dir %d)\n",
+ scmnd->request_buffer, (int) scmnd->request_bufflen,
+ scmnd->sc_data_direction);
+ return -EINVAL;
+ }
+
+ pci_unmap_addr_set(req, direct_mapping, dma);
+
+ buf->va = cpu_to_be64(dma);
+ buf->key = cpu_to_be32(target->srp_host->mr->rkey);
+ buf->len = cpu_to_be32(scmnd->request_bufflen);
+
+ fmt = SRP_DATA_DESC_DIRECT;
+
+ len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
+ }
+
+ if (scmnd->sc_data_direction == DMA_TO_DEVICE)
+ cmd->buf_fmt = fmt << 4;
+ else
+ cmd->buf_fmt = fmt;
+
+
+ return len;
+}
+
+static void srp_unmap_data(struct scsi_cmnd *scmnd,
+ struct srp_target_port *target,
+ struct srp_request *req)
+{
+ if (!scmnd->request_buffer ||
+ (scmnd->sc_data_direction != DMA_TO_DEVICE &&
+ scmnd->sc_data_direction != DMA_FROM_DEVICE))
+ return;
+
+ if (scmnd->use_sg)
+ dma_unmap_sg(target->srp_host->dev->dma_device,
+ (struct scatterlist *) scmnd->request_buffer,
+ scmnd->use_sg, scmnd->sc_data_direction);
+ else
+ dma_unmap_single(target->srp_host->dev->dma_device,
+ pci_unmap_addr(req, direct_mapping),
+ scmnd->request_bufflen,
+ scmnd->sc_data_direction);
+}
+
+static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
+{
+ struct srp_request *req;
+ struct scsi_cmnd *scmnd;
+ unsigned long flags;
+ s32 delta;
+
+ delta = (s32) be32_to_cpu(rsp->req_lim_delta);
+
+ spin_lock_irqsave(target->scsi_host->host_lock, flags);
+
+ target->req_lim += delta;
+
+ req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
+
+ if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
+ if (be32_to_cpu(rsp->resp_data_len) < 4)
+ req->tsk_status = -1;
+ else
+ req->tsk_status = rsp->data[3];
+ complete(&req->done);
+ } else {
+ scmnd = req->scmnd;
+ if (!scmnd)
+ printk(KERN_ERR "Null scmnd for RSP w/tag %016llx\n",
+ (unsigned long long) rsp->tag);
+ scmnd->result = rsp->status;
+
+ if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
+ memcpy(scmnd->sense_buffer, rsp->data +
+ be32_to_cpu(rsp->resp_data_len),
+ min_t(int, be32_to_cpu(rsp->sense_data_len),
+ SCSI_SENSE_BUFFERSIZE));
+ }
+
+ if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
+ scmnd->resid = be32_to_cpu(rsp->data_out_res_cnt);
+ else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
+ scmnd->resid = be32_to_cpu(rsp->data_in_res_cnt);
+
+ srp_unmap_data(scmnd, target, req);
+
+ if (!req->tsk_mgmt) {
+ req->scmnd = NULL;
+ scmnd->host_scribble = (void *) -1L;
+ scmnd->scsi_done(scmnd);
+
+ list_del(&req->list);
+ req->next = target->req_head;
+ target->req_head = rsp->tag & ~SRP_TAG_TSK_MGMT;
+ } else
+ req->cmd_done = 1;
+ }
+
+ spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
+}
+
+static void srp_reconnect_work(void *target_ptr)
+{
+ struct srp_target_port *target = target_ptr;
+
+ srp_reconnect_target(target);
+}
+
+static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
+{
+ struct srp_iu *iu;
+ u8 opcode;
+
+ iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV];
+
+ dma_sync_single_for_cpu(target->srp_host->dev->dma_device, iu->dma,
+ target->max_ti_iu_len, DMA_FROM_DEVICE);
+
+ opcode = *(u8 *) iu->buf;
+
+ if (0) {
+ int i;
+
+ printk(KERN_ERR PFX "recv completion, opcode 0x%02x\n", opcode);
+
+ for (i = 0; i < wc->byte_len; ++i) {
+ if (i % 8 == 0)
+ printk(KERN_ERR " [%02x] ", i);
+ printk(" %02x", ((u8 *) iu->buf)[i]);
+ if ((i + 1) % 8 == 0)
+ printk("\n");
+ }
+
+ if (wc->byte_len % 8)
+ printk("\n");
+ }
+
+ switch (opcode) {
+ case SRP_RSP:
+ srp_process_rsp(target, iu->buf);
+ break;
+
+ case SRP_T_LOGOUT:
+ /* XXX Handle target logout */
+ printk(KERN_WARNING PFX "Got target logout request\n");
+ break;
+
+ default:
+ printk(KERN_WARNING PFX "Unhandled SRP opcode 0x%02x\n", opcode);
+ break;
+ }
+
+ dma_sync_single_for_device(target->srp_host->dev->dma_device, iu->dma,
+ target->max_ti_iu_len, DMA_FROM_DEVICE);
+}
+
+static void srp_completion(struct ib_cq *cq, void *target_ptr)
+{
+ struct srp_target_port *target = target_ptr;
+ struct ib_wc wc;
+ unsigned long flags;
+
+ ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
+ while (ib_poll_cq(cq, 1, &wc) > 0) {
+ if (wc.status) {
+ printk(KERN_ERR PFX "failed %s status %d\n",
+ wc.wr_id & SRP_OP_RECV ? "receive" : "send",
+ wc.status);
+ spin_lock_irqsave(target->scsi_host->host_lock, flags);
+ if (target->state == SRP_TARGET_LIVE)
+ schedule_work(&target->work);
+ spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
+ break;
+ }
+
+ if (wc.wr_id & SRP_OP_RECV)
+ srp_handle_recv(target, &wc);
+ else
+ ++target->tx_tail;
+ }
+}
+
+static int __srp_post_recv(struct srp_target_port *target)
+{
+ struct srp_iu *iu;
+ struct ib_sge list;
+ struct ib_recv_wr wr, *bad_wr;
+ unsigned int next;
+ int ret;
+
+ next = target->rx_head & (SRP_RQ_SIZE - 1);
+ wr.wr_id = next | SRP_OP_RECV;
+ iu = target->rx_ring[next];
+
+ list.addr = iu->dma;
+ list.length = iu->size;
+ list.lkey = target->srp_host->mr->lkey;
+
+ wr.next = NULL;
+ wr.sg_list = &list;
+ wr.num_sge = 1;
+
+ ret = ib_post_recv(target->qp, &wr, &bad_wr);
+ if (!ret)
+ ++target->rx_head;
+
+ return ret;
+}
+
+static int srp_post_recv(struct srp_target_port *target)
+{
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(target->scsi_host->host_lock, flags);
+ ret = __srp_post_recv(target);
+ spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
+
+ return ret;
+}
+
+/*
+ * Must be called with target->scsi_host->host_lock held to protect
+ * req_lim and tx_head.
+ */
+static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target)
+{
+ if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
+ return NULL;
+
+ return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
+}
+
+/*
+ * Must be called with target->scsi_host->host_lock held to protect
+ * req_lim and tx_head.
+ */
+static int __srp_post_send(struct srp_target_port *target,
+ struct srp_iu *iu, int len)
+{
+ struct ib_sge list;
+ struct ib_send_wr wr, *bad_wr;
+ int ret = 0;
+
+ if (target->req_lim < 1) {
+ printk(KERN_ERR PFX "Target has req_lim %d\n", target->req_lim);
+ return -EAGAIN;
+ }
+
+ list.addr = iu->dma;
+ list.length = len;
+ list.lkey = target->srp_host->mr->lkey;
+
+ wr.next = NULL;
+ wr.wr_id = target->tx_head & SRP_SQ_SIZE;
+ wr.sg_list = &list;
+ wr.num_sge = 1;
+ wr.opcode = IB_WR_SEND;
+ wr.send_flags = IB_SEND_SIGNALED;
+
+ ret = ib_post_send(target->qp, &wr, &bad_wr);
+
+ if (!ret) {
+ ++target->tx_head;
+ --target->req_lim;
+ }
+
+ return ret;
+}
+
+static int srp_queuecommand(struct scsi_cmnd *scmnd,
+ void (*done)(struct scsi_cmnd *))
+{
+ struct srp_target_port *target = host_to_target(scmnd->device->host);
+ struct srp_request *req;
+ struct srp_iu *iu;
+ struct srp_cmd *cmd;
+ long req_index;
+ int len;
+
+ if (target->state == SRP_TARGET_CONNECTING)
+ goto err;
+
+ if (target->state == SRP_TARGET_DEAD ||
+ target->state == SRP_TARGET_REMOVED) {
+ scmnd->result = DID_BAD_TARGET << 16;
+ done(scmnd);
+ return 0;
+ }
+
+ iu = __srp_get_tx_iu(target);
+ if (!iu)
+ goto err;
+
+ dma_sync_single_for_cpu(target->srp_host->dev->dma_device, iu->dma,
+ SRP_MAX_IU_LEN, DMA_TO_DEVICE);
+
+ req_index = target->req_head;
+
+ scmnd->scsi_done = done;
+ scmnd->result = 0;
+ scmnd->host_scribble = (void *) req_index;
+
+ cmd = iu->buf;
+ memset(cmd, 0, sizeof *cmd);
+
+ cmd->opcode = SRP_CMD;
+ cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
+ cmd->tag = req_index;
+ memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
+
+ req = &target->req_ring[req_index];
+
+ req->scmnd = scmnd;
+ req->cmd = iu;
+ req->cmd_done = 0;
+ req->tsk_mgmt = NULL;
+
+ len = srp_map_data(scmnd, target, req);
+ if (len < 0) {
+ printk(KERN_ERR PFX "Failed to map data\n");
+ goto err;
+ }
+
+ if (__srp_post_recv(target)) {
+ printk(KERN_ERR PFX "Recv failed\n");
+ goto err_unmap;
+ }
+
+ dma_sync_single_for_device(target->srp_host->dev->dma_device, iu->dma,
+ SRP_MAX_IU_LEN, DMA_TO_DEVICE);
+
+ if (__srp_post_send(target, iu, len)) {
+ printk(KERN_ERR PFX "Send failed\n");
+ goto err_unmap;
+ }
+
+ target->req_head = req->next;
+ list_add_tail(&req->list, &target->req_queue);
+
+ return 0;
+
+err_unmap:
+ srp_unmap_data(scmnd, target, req);
+
+err:
+ return SCSI_MLQUEUE_HOST_BUSY;
+}
+
+static int srp_alloc_iu_bufs(struct srp_target_port *target)
+{
+ int i;
+
+ for (i = 0; i < SRP_RQ_SIZE; ++i) {
+ target->rx_ring[i] = srp_alloc_iu(target->srp_host,
+ target->max_ti_iu_len,
+ GFP_KERNEL, DMA_FROM_DEVICE);
+ if (!target->rx_ring[i])
+ goto err;
+ }
+
+ for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
+ target->tx_ring[i] = srp_alloc_iu(target->srp_host,
+ SRP_MAX_IU_LEN,
+ GFP_KERNEL, DMA_TO_DEVICE);
+ if (!target->tx_ring[i])
+ goto err;
+ }
+
+ return 0;
+
+err:
+ for (i = 0; i < SRP_RQ_SIZE; ++i) {
+ srp_free_iu(target->srp_host, target->rx_ring[i]);
+ target->rx_ring[i] = NULL;
+ }
+
+ for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
+ srp_free_iu(target->srp_host, target->tx_ring[i]);
+ target->tx_ring[i] = NULL;
+ }
+
+ return -ENOMEM;
+}
+
+static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
+ struct ib_cm_event *event,
+ struct srp_target_port *target)
+{
+ struct ib_class_port_info *cpi;
+ int opcode;
+
+ switch (event->param.rej_rcvd.reason) {
+ case IB_CM_REJ_PORT_CM_REDIRECT:
+ cpi = event->param.rej_rcvd.ari;
+ target->path.dlid = cpi->redirect_lid;
+ target->path.pkey = cpi->redirect_pkey;
+ cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
+ memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
+
+ target->status = target->path.dlid ?
+ SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
+ break;
+
+ case IB_CM_REJ_PORT_REDIRECT:
+ if (topspin_workarounds &&
+ !memcmp(&target->ioc_guid, topspin_oui, 3)) {
+ /*
+ * Topspin/Cisco SRP gateways incorrectly send
+ * reject reason code 25 when they mean 24
+ * (port redirect).
+ */
+ memcpy(target->path.dgid.raw,
+ event->param.rej_rcvd.ari, 16);
+
+ printk(KERN_DEBUG PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
+ (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
+ (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
+
+ target->status = SRP_PORT_REDIRECT;
+ } else {
+ printk(KERN_WARNING " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
+ target->status = -ECONNRESET;
+ }
+ break;
+
+ case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
+ printk(KERN_WARNING " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
+ target->status = -ECONNRESET;
+ break;
+
+ case IB_CM_REJ_CONSUMER_DEFINED:
+ opcode = *(u8 *) event->private_data;
+ if (opcode == SRP_LOGIN_REJ) {
+ struct srp_login_rej *rej = event->private_data;
+ u32 reason = be32_to_cpu(rej->reason);
+
+ if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
+ printk(KERN_WARNING PFX
+ "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
+ else
+ printk(KERN_WARNING PFX
+ "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
+ } else
+ printk(KERN_WARNING " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
+ " opcode 0x%02x\n", opcode);
+ target->status = -ECONNRESET;
+ break;
+
+ default:
+ printk(KERN_WARNING " REJ reason 0x%x\n",
+ event->param.rej_rcvd.reason);
+ target->status = -ECONNRESET;
+ }
+}
+
+static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
+{
+ struct srp_target_port *target = cm_id->context;
+ struct ib_qp_attr *qp_attr = NULL;
+ int attr_mask = 0;
+ int comp = 0;
+ int opcode = 0;
+
+ switch (event->event) {
+ case IB_CM_REQ_ERROR:
+ printk(KERN_DEBUG PFX "Sending CM REQ failed\n");
+ comp = 1;
+ target->status = -ECONNRESET;
+ break;
+
+ case IB_CM_REP_RECEIVED:
+ comp = 1;
+ opcode = *(u8 *) event->private_data;
+
+ if (opcode == SRP_LOGIN_RSP) {
+ struct srp_login_rsp *rsp = event->private_data;
+
+ target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
+ target->req_lim = be32_to_cpu(rsp->req_lim_delta);
+
+ target->scsi_host->can_queue = min(target->req_lim,
+ target->scsi_host->can_queue);
+ } else {
+ printk(KERN_WARNING PFX "Unhandled RSP opcode %#x\n", opcode);
+ target->status = -ECONNRESET;
+ break;
+ }
+
+ target->status = srp_alloc_iu_bufs(target);
+ if (target->status)
+ break;
+
+ qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
+ if (!qp_attr) {
+ target->status = -ENOMEM;
+ break;
+ }
+
+ qp_attr->qp_state = IB_QPS_RTR;
+ target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
+ if (target->status)
+ break;
+
+ target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
+ if (target->status)
+ break;
+
+ target->status = srp_post_recv(target);
+ if (target->status)
+ break;
+
+ qp_attr->qp_state = IB_QPS_RTS;
+ target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
+ if (target->status)
+ break;
+
+ target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
+ if (target->status)
+ break;
+
+ target->status = ib_send_cm_rtu(cm_id, NULL, 0);
+ if (target->status)
+ break;
+
+ break;
+
+ case IB_CM_REJ_RECEIVED:
+ printk(KERN_DEBUG PFX "REJ received\n");
+ comp = 1;
+
+ srp_cm_rej_handler(cm_id, event, target);
+ break;
+
+ case IB_CM_MRA_RECEIVED:
+ printk(KERN_ERR PFX "MRA received\n");
+ break;
+
+ case IB_CM_DREP_RECEIVED:
+ break;
+
+ case IB_CM_TIMEWAIT_EXIT:
+ printk(KERN_ERR PFX "connection closed\n");
+
+ comp = 1;
+ target->status = 0;
+ break;
+
+ default:
+ printk(KERN_WARNING PFX "Unhandled CM event %d\n", event->event);
+ break;
+ }
+
+ if (comp)
+ complete(&target->done);
+
+ kfree(qp_attr);
+
+ return 0;
+}
+
+static int srp_send_tsk_mgmt(struct scsi_cmnd *scmnd, u8 func)
+{
+ struct srp_target_port *target = host_to_target(scmnd->device->host);
+ struct srp_request *req;
+ struct srp_iu *iu;
+ struct srp_tsk_mgmt *tsk_mgmt;
+ int req_index;
+ int ret = FAILED;
+
+ spin_lock_irq(target->scsi_host->host_lock);
+
+ if (scmnd->host_scribble == (void *) -1L)
+ goto out;
+
+ req_index = (long) scmnd->host_scribble;
+ printk(KERN_ERR "Abort for req_index %d\n", req_index);
+
+ req = &target->req_ring[req_index];
+ init_completion(&req->done);
+
+ iu = __srp_get_tx_iu(target);
+ if (!iu)
+ goto out;
+
+ tsk_mgmt = iu->buf;
+ memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
+
+ tsk_mgmt->opcode = SRP_TSK_MGMT;
+ tsk_mgmt->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
+ tsk_mgmt->tag = req_index | SRP_TAG_TSK_MGMT;
+ tsk_mgmt->tsk_mgmt_func = func;
+ tsk_mgmt->task_tag = req_index;
+
+ if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
+ goto out;
+
+ req->tsk_mgmt = iu;
+
+ spin_unlock_irq(target->scsi_host->host_lock);
+ if (!wait_for_completion_timeout(&req->done,
+ msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
+ return FAILED;
+ spin_lock_irq(target->scsi_host->host_lock);
+
+ if (req->cmd_done) {
+ list_del(&req->list);
+ req->next = target->req_head;
+ target->req_head = req_index;
+
+ scmnd->scsi_done(scmnd);
+ } else if (!req->tsk_status) {
+ scmnd->result = DID_ABORT << 16;
+ ret = SUCCESS;
+ }
+
+out:
+ spin_unlock_irq(target->scsi_host->host_lock);
+ return ret;
+}
+
+static int srp_abort(struct scsi_cmnd *scmnd)
+{
+ printk(KERN_ERR "SRP abort called\n");
+
+ return srp_send_tsk_mgmt(scmnd, SRP_TSK_ABORT_TASK);
+}
+
+static int srp_reset_device(struct scsi_cmnd *scmnd)
+{
+ printk(KERN_ERR "SRP reset_device called\n");
+
+ return srp_send_tsk_mgmt(scmnd, SRP_TSK_LUN_RESET);
+}
+
+static int srp_reset_host(struct scsi_cmnd *scmnd)
+{
+ struct srp_target_port *target = host_to_target(scmnd->device->host);
+ int ret = FAILED;
+
+ printk(KERN_ERR PFX "SRP reset_host called\n");
+
+ if (!srp_reconnect_target(target))
+ ret = SUCCESS;
+
+ return ret;
+}
+
+static struct scsi_host_template srp_template = {
+ .module = THIS_MODULE,
+ .name = DRV_NAME,
+ .info = srp_target_info,
+ .queuecommand = srp_queuecommand,
+ .eh_abort_handler = srp_abort,
+ .eh_device_reset_handler = srp_reset_device,
+ .eh_host_reset_handler = srp_reset_host,
+ .can_queue = SRP_SQ_SIZE,
+ .this_id = -1,
+ .sg_tablesize = SRP_MAX_INDIRECT,
+ .cmd_per_lun = SRP_SQ_SIZE,
+ .use_clustering = ENABLE_CLUSTERING
+};
+
+static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
+{
+ sprintf(target->target_name, "SRP.T10:%016llX",
+ (unsigned long long) be64_to_cpu(target->id_ext));
+
+ if (scsi_add_host(target->scsi_host, host->dev->dma_device))
+ return -ENODEV;
+
+ down(&host->target_mutex);
+ list_add_tail(&target->list, &host->target_list);
+ up(&host->target_mutex);
+
+ target->state = SRP_TARGET_LIVE;
+
+ /* XXX: are we supposed to have a definition of SCAN_WILD_CARD ?? */
+ scsi_scan_target(&target->scsi_host->shost_gendev,
+ 0, target->scsi_id, ~0, 0);
+
+ return 0;
+}
+
+static void srp_release_class_dev(struct class_device *class_dev)
+{
+ struct srp_host *host =
+ container_of(class_dev, struct srp_host, class_dev);
+
+ complete(&host->released);
+}
+
+static struct class srp_class = {
+ .name = "infiniband_srp",
+ .release = srp_release_class_dev
+};
+
+/*
+ * Target ports are added by writing
+ *
+ * id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
+ * pkey=<P_Key>,service_id=<service ID>
+ *
+ * to the add_target sysfs attribute.
+ */
+enum {
+ SRP_OPT_ERR = 0,
+ SRP_OPT_ID_EXT = 1 << 0,
+ SRP_OPT_IOC_GUID = 1 << 1,
+ SRP_OPT_DGID = 1 << 2,
+ SRP_OPT_PKEY = 1 << 3,
+ SRP_OPT_SERVICE_ID = 1 << 4,
+ SRP_OPT_MAX_SECT = 1 << 5,
+ SRP_OPT_ALL = (SRP_OPT_ID_EXT |
+ SRP_OPT_IOC_GUID |
+ SRP_OPT_DGID |
+ SRP_OPT_PKEY |
+ SRP_OPT_SERVICE_ID),
+};
+
+static match_table_t srp_opt_tokens = {
+ { SRP_OPT_ID_EXT, "id_ext=%s" },
+ { SRP_OPT_IOC_GUID, "ioc_guid=%s" },
+ { SRP_OPT_DGID, "dgid=%s" },
+ { SRP_OPT_PKEY, "pkey=%x" },
+ { SRP_OPT_SERVICE_ID, "service_id=%s" },
+ { SRP_OPT_MAX_SECT, "max_sect=%d" },
+ { SRP_OPT_ERR, NULL }
+};
+
+static int srp_parse_options(const char *buf, struct srp_target_port *target)
+{
+ char *options, *sep_opt;
+ char *p;
+ char dgid[3];
+ substring_t args[MAX_OPT_ARGS];
+ int opt_mask = 0;
+ int token;
+ int ret = -EINVAL;
+ int i;
+
+ options = kstrdup(buf, GFP_KERNEL);
+ if (!options)
+ return -ENOMEM;
+
+ sep_opt = options;
+ while ((p = strsep(&sep_opt, ",")) != NULL) {
+ if (!*p)
+ continue;
+
+ token = match_token(p, srp_opt_tokens, args);
+ opt_mask |= token;
+
+ switch (token) {
+ case SRP_OPT_ID_EXT:
+ p = match_strdup(args);
+ target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
+ kfree(p);
+ break;
+
+ case SRP_OPT_IOC_GUID:
+ p = match_strdup(args);
+ target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
+ kfree(p);
+ break;
+
+ case SRP_OPT_DGID:
+ p = match_strdup(args);
+ if (strlen(p) != 32) {
+ printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
+ goto out;
+ }
+
+ for (i = 0; i < 16; ++i) {
+ strlcpy(dgid, p + i * 2, 3);
+ target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
+ }
+ break;
+
+ case SRP_OPT_PKEY:
+ if (match_hex(args, &token)) {
+ printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
+ goto out;
+ }
+ target->path.pkey = cpu_to_be16(token);
+ break;
+
+ case SRP_OPT_SERVICE_ID:
+ p = match_strdup(args);
+ target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
+ kfree(p);
+ break;
+
+ case SRP_OPT_MAX_SECT:
+ if (match_int(args, &token)) {
+ printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
+ goto out;
+ }
+ target->scsi_host->max_sectors = token;
+ break;
+
+ default:
+ printk(KERN_WARNING PFX "unknown parameter or missing value "
+ "'%s' in target creation request\n", p);
+ goto out;
+ }
+ }
+
+ if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
+ ret = 0;
+ else
+ for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
+ if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
+ !(srp_opt_tokens[i].token & opt_mask))
+ printk(KERN_WARNING PFX "target creation request is "
+ "missing parameter '%s'\n",
+ srp_opt_tokens[i].pattern);
+
+out:
+ kfree(options);
+ return ret;
+}
+
+static ssize_t srp_create_target(struct class_device *class_dev,
+ const char *buf, size_t count)
+{
+ struct srp_host *host =
+ container_of(class_dev, struct srp_host, class_dev);
+ struct Scsi_Host *target_host;
+ struct srp_target_port *target;
+ int ret;
+ int i;
+
+ target_host = scsi_host_alloc(&srp_template,
+ sizeof (struct srp_target_port));
+ if (!target_host)
+ return -ENOMEM;
+
+ target = host_to_target(target_host);
+ memset(target, 0, sizeof *target);
+
+ target->scsi_host = target_host;
+ target->srp_host = host;
+
+ INIT_WORK(&target->work, srp_reconnect_work, target);
+
+ for (i = 0; i < SRP_SQ_SIZE - 1; ++i)
+ target->req_ring[i].next = i + 1;
+ target->req_ring[SRP_SQ_SIZE - 1].next = -1;
+ INIT_LIST_HEAD(&target->req_queue);
+
+ ret = srp_parse_options(buf, target);
+ if (ret)
+ goto err;
+
+ ib_get_cached_gid(host->dev, host->port, 0, &target->path.sgid);
+
+ printk(KERN_DEBUG PFX "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
+ "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
+ (unsigned long long) be64_to_cpu(target->id_ext),
+ (unsigned long long) be64_to_cpu(target->ioc_guid),
+ be16_to_cpu(target->path.pkey),
+ (unsigned long long) be64_to_cpu(target->service_id),
+ (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]),
+ (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]),
+ (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]),
+ (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]),
+ (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]),
+ (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]),
+ (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]),
+ (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14]));
+
+ ret = srp_create_target_ib(target);
+ if (ret)
+ goto err;
+
+ target->cm_id = ib_create_cm_id(host->dev, srp_cm_handler, target);
+ if (IS_ERR(target->cm_id)) {
+ ret = PTR_ERR(target->cm_id);
+ goto err_free;
+ }
+
+ ret = srp_connect_target(target);
+ if (ret) {
+ printk(KERN_ERR PFX "Connection failed\n");
+ goto err_cm_id;
+ }
+
+ ret = srp_add_target(host, target);
+ if (ret)
+ goto err_disconnect;
+
+ return count;
+
+err_disconnect:
+ srp_disconnect_target(target);
+
+err_cm_id:
+ ib_destroy_cm_id(target->cm_id);
+
+err_free:
+ srp_free_target_ib(target);
+
+err:
+ scsi_host_put(target_host);
+
+ return ret;
+}
+
+static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
+
+static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
+{
+ struct srp_host *host =
+ container_of(class_dev, struct srp_host, class_dev);
+
+ return sprintf(buf, "%s\n", host->dev->name);
+}
+
+static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
+
+static ssize_t show_port(struct class_device *class_dev, char *buf)
+{
+ struct srp_host *host =
+ container_of(class_dev, struct srp_host, class_dev);
+
+ return sprintf(buf, "%d\n", host->port);
+}
+
+static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
+
+static struct srp_host *srp_add_port(struct ib_device *device,
+ __be64 node_guid, u8 port)
+{
+ struct srp_host *host;
+
+ host = kzalloc(sizeof *host, GFP_KERNEL);
+ if (!host)
+ return NULL;
+
+ INIT_LIST_HEAD(&host->target_list);
+ init_MUTEX(&host->target_mutex);
+ init_completion(&host->released);
+ host->dev = device;
+ host->port = port;
+
+ host->initiator_port_id[7] = port;
+ memcpy(host->initiator_port_id + 8, &node_guid, 8);
+
+ host->pd = ib_alloc_pd(device);
+ if (IS_ERR(host->pd))
+ goto err_free;
+
+ host->mr = ib_get_dma_mr(host->pd,
+ IB_ACCESS_LOCAL_WRITE |
+ IB_ACCESS_REMOTE_READ |
+ IB_ACCESS_REMOTE_WRITE);
+ if (IS_ERR(host->mr))
+ goto err_pd;
+
+ host->class_dev.class = &srp_class;
+ host->class_dev.dev = device->dma_device;
+ snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d",
+ device->name, port);
+
+ if (class_device_register(&host->class_dev))
+ goto err_mr;
+ if (class_device_create_file(&host->class_dev, &class_device_attr_add_target))
+ goto err_class;
+ if (class_device_create_file(&host->class_dev, &class_device_attr_ibdev))
+ goto err_class;
+ if (class_device_create_file(&host->class_dev, &class_device_attr_port))
+ goto err_class;
+
+ return host;
+
+err_class:
+ class_device_unregister(&host->class_dev);
+
+err_mr:
+ ib_dereg_mr(host->mr);
+
+err_pd:
+ ib_dealloc_pd(host->pd);
+
+err_free:
+ kfree(host);
+
+ return NULL;
+}
+
+static void srp_add_one(struct ib_device *device)
+{
+ struct list_head *dev_list;
+ struct srp_host *host;
+ struct ib_device_attr *dev_attr;
+ int s, e, p;
+
+ dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
+ if (!dev_attr)
+ return;
+
+ if (ib_query_device(device, dev_attr)) {
+ printk(KERN_WARNING PFX "Couldn't query node GUID for %s.\n",
+ device->name);
+ goto out;
+ }
+
+ dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
+ if (!dev_list)
+ goto out;
+
+ INIT_LIST_HEAD(dev_list);
+
+ if (device->node_type == IB_NODE_SWITCH) {
+ s = 0;
+ e = 0;
+ } else {
+ s = 1;
+ e = device->phys_port_cnt;
+ }
+
+ for (p = s; p <= e; ++p) {
+ host = srp_add_port(device, dev_attr->node_guid, p);
+ if (host)
+ list_add_tail(&host->list, dev_list);
+ }
+
+ ib_set_client_data(device, &srp_client, dev_list);
+
+out:
+ kfree(dev_attr);
+}
+
+static void srp_remove_one(struct ib_device *device)
+{
+ struct list_head *dev_list;
+ struct srp_host *host, *tmp_host;
+ LIST_HEAD(target_list);
+ struct srp_target_port *target, *tmp_target;
+ unsigned long flags;
+
+ dev_list = ib_get_client_data(device, &srp_client);
+
+ list_for_each_entry_safe(host, tmp_host, dev_list, list) {
+ class_device_unregister(&host->class_dev);
+ /*
+ * Wait for the sysfs entry to go away, so that no new
+ * target ports can be created.
+ */
+ wait_for_completion(&host->released);
+
+ /*
+ * Mark all target ports as removed, so we stop queueing
+ * commands and don't try to reconnect.
+ */
+ down(&host->target_mutex);
+ list_for_each_entry_safe(target, tmp_target,
+ &host->target_list, list) {
+ spin_lock_irqsave(target->scsi_host->host_lock, flags);
+ if (target->state != SRP_TARGET_REMOVED)
+ target->state = SRP_TARGET_REMOVED;
+ spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
+ }
+ up(&host->target_mutex);
+
+ /*
+ * Wait for any reconnection tasks that may have
+ * started before we marked our target ports as
+ * removed, and any target port removal tasks.
+ */
+ flush_scheduled_work();
+
+ list_for_each_entry_safe(target, tmp_target,
+ &host->target_list, list) {
+ scsi_remove_host(target->scsi_host);
+ srp_disconnect_target(target);
+ ib_destroy_cm_id(target->cm_id);
+ srp_free_target_ib(target);
+ scsi_host_put(target->scsi_host);
+ }
+
+ ib_dereg_mr(host->mr);
+ ib_dealloc_pd(host->pd);
+ kfree(host);
+ }
+
+ kfree(dev_list);
+}
+
+static int __init srp_init_module(void)
+{
+ int ret;
+
+ ret = class_register(&srp_class);
+ if (ret) {
+ printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
+ return ret;
+ }
+
+ ret = ib_register_client(&srp_client);
+ if (ret) {
+ printk(KERN_ERR PFX "couldn't register IB client\n");
+ class_unregister(&srp_class);
+ return ret;
+ }
+
+ return 0;
+}
+
+static void __exit srp_cleanup_module(void)
+{
+ ib_unregister_client(&srp_client);
+ class_unregister(&srp_class);
+}
+
+module_init(srp_init_module);
+module_exit(srp_cleanup_module);
projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / commitdiff