--- /dev/null
+/*******************************************************************************
+ *
+ * Intel Ethernet Controller XL710 Family Linux Driver
+ * Copyright(c) 2013 - 2014 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * The full GNU General Public License is included in this distribution in
+ * the file called "COPYING".
+ *
+ * Contact Information:
+ * e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
+ * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+ *
+ ******************************************************************************/
+
+
+#include <linux/if_ether.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+#include <scsi/fc/fc_fs.h>
+#include <scsi/fc/fc_fip.h>
+#include <scsi/fc/fc_fcoe.h>
+#include <scsi/libfc.h>
+#include <scsi/libfcoe.h>
+
+#include "i40e.h"
+#include "i40e_fcoe.h"
+
+/**
+ * i40e_rx_is_fip - returns true if the rx packet type is FIP
+ * @ptype: the packet type field from rx descriptor write-back
+ **/
+static inline bool i40e_rx_is_fip(u16 ptype)
+{
+ return ptype == I40E_RX_PTYPE_L2_FIP_PAY2;
+}
+
+/**
+ * i40e_rx_is_fcoe - returns true if the rx packet type is FCoE
+ * @ptype: the packet type field from rx descriptor write-back
+ **/
+static inline bool i40e_rx_is_fcoe(u16 ptype)
+{
+ return (ptype >= I40E_RX_PTYPE_L2_FCOE_PAY3) &&
+ (ptype <= I40E_RX_PTYPE_L2_FCOE_VFT_FCOTHER);
+}
+
+/**
+ * i40e_fcoe_sof_is_class2 - returns true if this is a FC Class 2 SOF
+ * @sof: the FCoE start of frame delimiter
+ **/
+static inline bool i40e_fcoe_sof_is_class2(u8 sof)
+{
+ return (sof == FC_SOF_I2) || (sof == FC_SOF_N2);
+}
+
+/**
+ * i40e_fcoe_sof_is_class3 - returns true if this is a FC Class 3 SOF
+ * @sof: the FCoE start of frame delimiter
+ **/
+static inline bool i40e_fcoe_sof_is_class3(u8 sof)
+{
+ return (sof == FC_SOF_I3) || (sof == FC_SOF_N3);
+}
+
+/**
+ * i40e_fcoe_sof_is_supported - returns true if the FC SOF is supported by HW
+ * @sof: the input SOF value from the frame
+ **/
+static inline bool i40e_fcoe_sof_is_supported(u8 sof)
+{
+ return i40e_fcoe_sof_is_class2(sof) ||
+ i40e_fcoe_sof_is_class3(sof);
+}
+
+/**
+ * i40e_fcoe_fc_sof - pull the SOF from FCoE header in the frame
+ * @skb: the frame whose EOF is to be pulled from
+ **/
+static inline int i40e_fcoe_fc_sof(struct sk_buff *skb, u8 *sof)
+{
+ *sof = ((struct fcoe_hdr *)skb_network_header(skb))->fcoe_sof;
+
+ if (!i40e_fcoe_sof_is_supported(*sof))
+ return -EINVAL;
+ return 0;
+}
+
+/**
+ * i40e_fcoe_eof_is_supported - returns true if the EOF is supported by HW
+ * @eof: the input EOF value from the frame
+ **/
+static inline bool i40e_fcoe_eof_is_supported(u8 eof)
+{
+ return (eof == FC_EOF_N) || (eof == FC_EOF_T) ||
+ (eof == FC_EOF_NI) || (eof == FC_EOF_A);
+}
+
+/**
+ * i40e_fcoe_fc_eof - pull EOF from FCoE trailer in the frame
+ * @skb: the frame whose EOF is to be pulled from
+ **/
+static inline int i40e_fcoe_fc_eof(struct sk_buff *skb, u8 *eof)
+{
+ /* the first byte of the last dword is EOF */
+ skb_copy_bits(skb, skb->len - 4, eof, 1);
+
+ if (!i40e_fcoe_eof_is_supported(*eof))
+ return -EINVAL;
+ return 0;
+}
+
+/**
+ * i40e_fcoe_ctxt_eof - convert input FC EOF for descriptor programming
+ * @eof: the input eof value from the frame
+ *
+ * The FC EOF is converted to the value understood by HW for descriptor
+ * programming. Never call this w/o calling i40e_fcoe_eof_is_supported()
+ * first.
+ **/
+static inline u32 i40e_fcoe_ctxt_eof(u8 eof)
+{
+ switch (eof) {
+ case FC_EOF_N:
+ return I40E_TX_DESC_CMD_L4T_EOFT_EOF_N;
+ case FC_EOF_T:
+ return I40E_TX_DESC_CMD_L4T_EOFT_EOF_T;
+ case FC_EOF_NI:
+ return I40E_TX_DESC_CMD_L4T_EOFT_EOF_NI;
+ case FC_EOF_A:
+ return I40E_TX_DESC_CMD_L4T_EOFT_EOF_A;
+ default:
+ /* FIXME: still returns 0 */
+ pr_err("Unrecognized EOF %x\n", eof);
+ return 0;
+ }
+}
+
+/**
+ * i40e_fcoe_xid_is_valid - returns true if the exchange id is valid
+ * @xid: the exchange id
+ **/
+static inline bool i40e_fcoe_xid_is_valid(u16 xid)
+{
+ return (xid != FC_XID_UNKNOWN) && (xid < I40E_FCOE_DDP_MAX);
+}
+
+/**
+ * i40e_fcoe_ddp_unmap - unmap the mapped sglist associated
+ * @pf: pointer to pf
+ * @ddp: sw DDP context
+ *
+ * Unmap the scatter-gather list associated with the given SW DDP context
+ *
+ * Returns: data length already ddp-ed in bytes
+ *
+ **/
+static inline void i40e_fcoe_ddp_unmap(struct i40e_pf *pf,
+ struct i40e_fcoe_ddp *ddp)
+{
+ if (test_and_set_bit(__I40E_FCOE_DDP_UNMAPPED, &ddp->flags))
+ return;
+
+ if (ddp->sgl) {
+ dma_unmap_sg(&pf->pdev->dev, ddp->sgl, ddp->sgc,
+ DMA_FROM_DEVICE);
+ ddp->sgl = NULL;
+ ddp->sgc = 0;
+ }
+
+ if (ddp->pool) {
+ dma_pool_free(ddp->pool, ddp->udl, ddp->udp);
+ ddp->pool = NULL;
+ }
+}
+
+/**
+ * i40e_fcoe_ddp_clear - clear the given SW DDP context
+ * @ddp - SW DDP context
+ **/
+static inline void i40e_fcoe_ddp_clear(struct i40e_fcoe_ddp *ddp)
+{
+ memset(ddp, 0, sizeof(struct i40e_fcoe_ddp));
+ ddp->xid = FC_XID_UNKNOWN;
+ ddp->flags = __I40E_FCOE_DDP_NONE;
+}
+
+/**
+ * i40e_fcoe_progid_is_fcoe - check if the prog_id is for FCoE
+ * @id: the prog id for the programming status Rx descriptor write-back
+ **/
+static inline bool i40e_fcoe_progid_is_fcoe(u8 id)
+{
+ return (id == I40E_RX_PROG_STATUS_DESC_FCOE_CTXT_PROG_STATUS) ||
+ (id == I40E_RX_PROG_STATUS_DESC_FCOE_CTXT_INVL_STATUS);
+}
+
+/**
+ * i40e_fcoe_fc_get_xid - get xid from the frame header
+ * @fh: the fc frame header
+ *
+ * In case the incoming frame's exchange is originated from
+ * the initiator, then received frame's exchange id is ANDed
+ * with fc_cpu_mask bits to get the same cpu on which exchange
+ * was originated, otherwise just use the current cpu.
+ *
+ * Returns ox_id if exchange originator, rx_id if responder
+ **/
+static inline u16 i40e_fcoe_fc_get_xid(struct fc_frame_header *fh)
+{
+ u32 f_ctl = ntoh24(fh->fh_f_ctl);
+
+ return (f_ctl & FC_FC_EX_CTX) ?
+ be16_to_cpu(fh->fh_ox_id) :
+ be16_to_cpu(fh->fh_rx_id);
+}
+
+/**
+ * i40e_fcoe_fc_frame_header - get fc frame header from skb
+ * @skb: packet
+ *
+ * This checks if there is a VLAN header and returns the data
+ * pointer to the start of the fc_frame_header.
+ *
+ * Returns pointer to the fc_frame_header
+ **/
+static inline struct fc_frame_header *i40e_fcoe_fc_frame_header(
+ struct sk_buff *skb)
+{
+ void *fh = skb->data + sizeof(struct fcoe_hdr);
+
+ if (eth_hdr(skb)->h_proto == htons(ETH_P_8021Q))
+ fh += sizeof(struct vlan_hdr);
+
+ return (struct fc_frame_header *)fh;
+}
+
+/**
+ * i40e_fcoe_ddp_put - release the DDP context for a given exchange id
+ * @netdev: the corresponding net_device
+ * @xid: the exchange id that corresponding DDP context will be released
+ *
+ * This is the implementation of net_device_ops.ndo_fcoe_ddp_done
+ * and it is expected to be called by ULD, i.e., FCP layer of libfc
+ * to release the corresponding ddp context when the I/O is done.
+ *
+ * Returns : data length already ddp-ed in bytes
+ **/
+static int i40e_fcoe_ddp_put(struct net_device *netdev, u16 xid)
+{
+ struct i40e_netdev_priv *np = netdev_priv(netdev);
+ struct i40e_pf *pf = np->vsi->back;
+ struct i40e_fcoe *fcoe = &pf->fcoe;
+ int len = 0;
+ struct i40e_fcoe_ddp *ddp = &fcoe->ddp[xid];
+
+ if (!fcoe || !ddp)
+ goto out;
+
+ if (test_bit(__I40E_FCOE_DDP_DONE, &ddp->flags))
+ len = ddp->len;
+ i40e_fcoe_ddp_unmap(pf, ddp);
+out:
+ return len;
+}
+
+/**
+ * i40e_fcoe_sw_init - sets up the HW for FCoE
+ * @pf: pointer to pf
+ *
+ * Returns 0 if FCoE is supported otherwise the error code
+ **/
+int i40e_init_pf_fcoe(struct i40e_pf *pf)
+{
+ struct i40e_hw *hw = &pf->hw;
+ u32 val;
+
+ pf->flags &= ~I40E_FLAG_FCOE_ENABLED;
+ pf->num_fcoe_qps = 0;
+ pf->fcoe_hmc_cntx_num = 0;
+ pf->fcoe_hmc_filt_num = 0;
+
+ if (!pf->hw.func_caps.fcoe) {
+ dev_info(&pf->pdev->dev, "FCoE capability is disabled\n");
+ return 0;
+ }
+
+ if (!pf->hw.func_caps.dcb) {
+ dev_warn(&pf->pdev->dev,
+ "Hardware is not DCB capable not enabling FCoE.\n");
+ return 0;
+ }
+
+ /* enable FCoE hash filter */
+ val = rd32(hw, I40E_PFQF_HENA(1));
+ val |= 1 << (I40E_FILTER_PCTYPE_FCOE_OX - 32);
+ val |= 1 << (I40E_FILTER_PCTYPE_FCOE_RX - 32);
+ val &= I40E_PFQF_HENA_PTYPE_ENA_MASK;
+ wr32(hw, I40E_PFQF_HENA(1), val);
+
+ /* enable flag */
+ pf->flags |= I40E_FLAG_FCOE_ENABLED;
+ pf->num_fcoe_qps = I40E_DEFAULT_FCOE;
+
+ /* Reserve 4K DDP contexts and 20K filter size for FCoE */
+ pf->fcoe_hmc_cntx_num = (1 << I40E_DMA_CNTX_SIZE_4K) *
+ I40E_DMA_CNTX_BASE_SIZE;
+ pf->fcoe_hmc_filt_num = pf->fcoe_hmc_cntx_num +
+ (1 << I40E_HASH_FILTER_SIZE_16K) *
+ I40E_HASH_FILTER_BASE_SIZE;
+
+ /* FCoE object: max 16K filter buckets and 4K DMA contexts */
+ pf->filter_settings.fcoe_filt_num = I40E_HASH_FILTER_SIZE_16K;
+ pf->filter_settings.fcoe_cntx_num = I40E_DMA_CNTX_SIZE_4K;
+
+ /* Setup max frame with FCoE_MTU plus L2 overheads */
+ val = rd32(hw, I40E_GLFCOE_RCTL);
+ val &= ~I40E_GLFCOE_RCTL_MAX_SIZE_MASK;
+ val |= ((FCOE_MTU + ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN)
+ << I40E_GLFCOE_RCTL_MAX_SIZE_SHIFT);
+ wr32(hw, I40E_GLFCOE_RCTL, val);
+
+ dev_info(&pf->pdev->dev, "FCoE is supported.\n");
+ return 0;
+}
+
+/**
+ * i40e_get_fcoe_tc_map - Return TC map for FCoE APP
+ * @pf: pointer to pf
+ *
+ **/
+u8 i40e_get_fcoe_tc_map(struct i40e_pf *pf)
+{
+ struct i40e_ieee_app_priority_table app;
+ struct i40e_hw *hw = &pf->hw;
+ u8 enabled_tc = 0;
+ u8 tc, i;
+ /* Get the FCoE APP TLV */
+ struct i40e_dcbx_config *dcbcfg = &hw->local_dcbx_config;
+
+ for (i = 0; i < dcbcfg->numapps; i++) {
+ app = dcbcfg->app[i];
+ if (app.selector == IEEE_8021QAZ_APP_SEL_ETHERTYPE &&
+ app.protocolid == ETH_P_FCOE) {
+ tc = dcbcfg->etscfg.prioritytable[app.priority];
+ enabled_tc |= (1 << tc);
+ break;
+ }
+ }
+
+ /* TC0 if there is no TC defined for FCoE APP TLV */
+ enabled_tc = enabled_tc ? enabled_tc : 0x1;
+
+ return enabled_tc;
+}
+
+/**
+ * i40e_fcoe_vsi_init - prepares the VSI context for creating a FCoE VSI
+ * @vsi: pointer to the associated VSI struct
+ * @ctxt: pointer to the associated VSI context to be passed to HW
+ *
+ * Returns 0 on success or < 0 on error
+ **/
+int i40e_fcoe_vsi_init(struct i40e_vsi *vsi, struct i40e_vsi_context *ctxt)
+{
+ struct i40e_aqc_vsi_properties_data *info = &ctxt->info;
+ struct i40e_pf *pf = vsi->back;
+ struct i40e_hw *hw = &pf->hw;
+ u8 enabled_tc = 0;
+
+ if (!(pf->flags & I40E_FLAG_FCOE_ENABLED)) {
+ dev_err(&pf->pdev->dev,
+ "FCoE is not enabled for this device\n");
+ return -EPERM;
+ }
+
+ /* initialize the hardware for FCoE */
+ ctxt->pf_num = hw->pf_id;
+ ctxt->vf_num = 0;
+ ctxt->uplink_seid = vsi->uplink_seid;
+ ctxt->connection_type = 0x1;
+ ctxt->flags = I40E_AQ_VSI_TYPE_PF;
+
+ /* FCoE VSI would need the following sections */
+ info->valid_sections |= cpu_to_le16(I40E_AQ_VSI_PROP_SWITCH_VALID |
+ I40E_AQ_VSI_PROP_QUEUE_OPT_VALID);
+
+ /* FCoE VSI does not need these sections */
+ info->valid_sections &= cpu_to_le16(~(I40E_AQ_VSI_PROP_SECURITY_VALID |
+ I40E_AQ_VSI_PROP_VLAN_VALID |
+ I40E_AQ_VSI_PROP_CAS_PV_VALID |
+ I40E_AQ_VSI_PROP_INGRESS_UP_VALID |
+ I40E_AQ_VSI_PROP_EGRESS_UP_VALID));
+
+ enabled_tc = i40e_get_fcoe_tc_map(pf);
+ i40e_vsi_setup_queue_map(vsi, ctxt, enabled_tc, true);
+
+ /* set up queue option section: only enable FCoE */
+ info->queueing_opt_flags = I40E_AQ_VSI_QUE_OPT_FCOE_ENA;
+
+ return 0;
+}
+
+/**
+ * i40e_fcoe_enable - this is the implementation of ndo_fcoe_enable,
+ * indicating the upper FCoE protocol stack is ready to use FCoE
+ * offload features.
+ *
+ * @netdev: pointer to the netdev that FCoE is created on
+ *
+ * Returns 0 on success
+ *
+ * in RTNL
+ *
+ **/
+int i40e_fcoe_enable(struct net_device *netdev)
+{
+ struct i40e_netdev_priv *np = netdev_priv(netdev);
+ struct i40e_vsi *vsi = np->vsi;
+ struct i40e_pf *pf = vsi->back;
+ struct i40e_fcoe *fcoe = &pf->fcoe;
+
+ if (!(pf->flags & I40E_FLAG_FCOE_ENABLED)) {
+ netdev_err(netdev, "HW does not support FCoE.\n");
+ return -ENODEV;
+ }
+
+ if (vsi->type != I40E_VSI_FCOE) {
+ netdev_err(netdev, "interface does not support FCoE.\n");
+ return -EBUSY;
+ }
+
+ atomic_inc(&fcoe->refcnt);
+
+ return 0;
+}
+
+/**
+ * i40e_fcoe_disable- disables FCoE for upper FCoE protocol stack.
+ * @dev: pointer to the netdev that FCoE is created on
+ *
+ * Returns 0 on success
+ *
+ **/
+int i40e_fcoe_disable(struct net_device *netdev)
+{
+ struct i40e_netdev_priv *np = netdev_priv(netdev);
+ struct i40e_vsi *vsi = np->vsi;
+ struct i40e_pf *pf = vsi->back;
+ struct i40e_fcoe *fcoe = &pf->fcoe;
+
+ if (!(pf->flags & I40E_FLAG_FCOE_ENABLED)) {
+ netdev_err(netdev, "device does not support FCoE\n");
+ return -ENODEV;
+ }
+ if (vsi->type != I40E_VSI_FCOE)
+ return -EBUSY;
+
+ if (!atomic_dec_and_test(&fcoe->refcnt))
+ return -EINVAL;
+
+ netdev_info(netdev, "FCoE disabled\n");
+
+ return 0;
+}
+
+/**
+ * i40e_fcoe_dma_pool_free - free the per cpu pool for FCoE DDP
+ * @fcoe: the FCoE sw object
+ * @dev: the device that the pool is associated with
+ * @cpu: the cpu for this pool
+ *
+ **/
+static void i40e_fcoe_dma_pool_free(struct i40e_fcoe *fcoe,
+ struct device *dev,
+ unsigned int cpu)
+{
+ struct i40e_fcoe_ddp_pool *ddp_pool;
+
+ ddp_pool = per_cpu_ptr(fcoe->ddp_pool, cpu);
+ if (!ddp_pool->pool) {
+ dev_warn(dev, "DDP pool already freed for cpu %d\n", cpu);
+ return;
+ }
+ dma_pool_destroy(ddp_pool->pool);
+ ddp_pool->pool = NULL;
+}
+
+/**
+ * i40e_fcoe_dma_pool_create - per cpu pool for FCoE DDP
+ * @fcoe: the FCoE sw object
+ * @dev: the device that the pool is associated with
+ * @cpu: the cpu for this pool
+ *
+ * Returns 0 on successful or non zero on failure
+ *
+ **/
+static int i40e_fcoe_dma_pool_create(struct i40e_fcoe *fcoe,
+ struct device *dev,
+ unsigned int cpu)
+{
+ struct i40e_fcoe_ddp_pool *ddp_pool;
+ struct dma_pool *pool;
+ char pool_name[32];
+
+ ddp_pool = per_cpu_ptr(fcoe->ddp_pool, cpu);
+ if (ddp_pool && ddp_pool->pool) {
+ dev_warn(dev, "DDP pool already allocated for cpu %d\n", cpu);
+ return 0;
+ }
+ snprintf(pool_name, sizeof(pool_name), "i40e_fcoe_ddp_%d", cpu);
+ pool = dma_pool_create(pool_name, dev, I40E_FCOE_DDP_PTR_MAX,
+ I40E_FCOE_DDP_PTR_ALIGN, PAGE_SIZE);
+ if (!pool) {
+ dev_err(dev, "dma_pool_create %s failed\n", pool_name);
+ return -ENOMEM;
+ }
+ ddp_pool->pool = pool;
+ return 0;
+}
+
+/**
+ * i40e_fcoe_free_ddp_resources - release FCoE DDP resources
+ * @vsi: the vsi FCoE is associated with
+ *
+ **/
+void i40e_fcoe_free_ddp_resources(struct i40e_vsi *vsi)
+{
+ struct i40e_pf *pf = vsi->back;
+ struct i40e_fcoe *fcoe = &pf->fcoe;
+ int cpu, i;
+
+ /* do nothing if not FCoE VSI */
+ if (vsi->type != I40E_VSI_FCOE)
+ return;
+
+ /* do nothing if no DDP pools were allocated */
+ if (!fcoe->ddp_pool)
+ return;
+
+ for (i = 0; i < I40E_FCOE_DDP_MAX; i++)
+ i40e_fcoe_ddp_put(vsi->netdev, i);
+
+ for_each_possible_cpu(cpu)
+ i40e_fcoe_dma_pool_free(fcoe, &pf->pdev->dev, cpu);
+
+ free_percpu(fcoe->ddp_pool);
+ fcoe->ddp_pool = NULL;
+
+ netdev_info(vsi->netdev, "VSI %d,%d FCoE DDP resources released\n",
+ vsi->id, vsi->seid);
+}
+
+/**
+ * i40e_fcoe_setup_ddp_resources - allocate per cpu DDP resources
+ * @vsi: the VSI FCoE is associated with
+ *
+ * Returns 0 on successful or non zero on failure
+ *
+ **/
+int i40e_fcoe_setup_ddp_resources(struct i40e_vsi *vsi)
+{
+ struct i40e_pf *pf = vsi->back;
+ struct device *dev = &pf->pdev->dev;
+ struct i40e_fcoe *fcoe = &pf->fcoe;
+ unsigned int cpu;
+ int i;
+
+ if (vsi->type != I40E_VSI_FCOE)
+ return -ENODEV;
+
+ /* do nothing if no DDP pools were allocated */
+ if (fcoe->ddp_pool)
+ return -EEXIST;
+
+ /* allocate per CPU memory to track DDP pools */
+ fcoe->ddp_pool = alloc_percpu(struct i40e_fcoe_ddp_pool);
+ if (!fcoe->ddp_pool) {
+ dev_err(&pf->pdev->dev, "failed to allocate percpu DDP\n");
+ return -ENOMEM;
+ }
+
+ /* allocate pci pool for each cpu */
+ for_each_possible_cpu(cpu) {
+ if (!i40e_fcoe_dma_pool_create(fcoe, dev, cpu))
+ continue;
+
+ dev_err(dev, "failed to alloc DDP pool on cpu:%d\n", cpu);
+ i40e_fcoe_free_ddp_resources(vsi);
+ return -ENOMEM;
+ }
+
+ /* initialize the sw context */
+ for (i = 0; i < I40E_FCOE_DDP_MAX; i++)
+ i40e_fcoe_ddp_clear(&fcoe->ddp[i]);
+
+ netdev_info(vsi->netdev, "VSI %d,%d FCoE DDP resources allocated\n",
+ vsi->id, vsi->seid);
+
+ return 0;
+}
+
+/**
+ * i40e_fcoe_handle_status - check the Programming Status for FCoE
+ * @rx_ring: the Rx ring for this descriptor
+ * @rx_desc: the Rx descriptor for Programming Status, not a packet descriptor.
+ *
+ * Check if this is the Rx Programming Status descriptor write-back for FCoE.
+ * This is used to verify if the context/filter programming or invalidation
+ * requested by SW to the HW is successful or not and take actions accordingly.
+ **/
+void i40e_fcoe_handle_status(struct i40e_ring *rx_ring,
+ union i40e_rx_desc *rx_desc, u8 prog_id)
+{
+ struct i40e_pf *pf = rx_ring->vsi->back;
+ struct i40e_fcoe *fcoe = &pf->fcoe;
+ struct i40e_fcoe_ddp *ddp;
+ u32 error;
+ u16 xid;
+ u64 qw;
+
+ /* we only care for FCoE here */
+ if (!i40e_fcoe_progid_is_fcoe(prog_id))
+ return;
+
+ xid = le32_to_cpu(rx_desc->wb.qword0.hi_dword.fcoe_param) &
+ (I40E_FCOE_DDP_MAX - 1);
+
+ if (!i40e_fcoe_xid_is_valid(xid))
+ return;
+
+ ddp = &fcoe->ddp[xid];
+ WARN_ON(xid != ddp->xid);
+
+ qw = le64_to_cpu(rx_desc->wb.qword1.status_error_len);
+ error = (qw & I40E_RX_PROG_STATUS_DESC_QW1_ERROR_MASK) >>
+ I40E_RX_PROG_STATUS_DESC_QW1_ERROR_SHIFT;
+
+ /* DDP context programming status: failure or success */
+ if (prog_id == I40E_RX_PROG_STATUS_DESC_FCOE_CTXT_PROG_STATUS) {
+ if (I40E_RX_PROG_FCOE_ERROR_TBL_FULL(error)) {
+ dev_err(&pf->pdev->dev, "xid %x ddp->xid %x TABLE FULL\n",
+ xid, ddp->xid);
+ ddp->prerr |= I40E_RX_PROG_FCOE_ERROR_TBL_FULL_BIT;
+ }
+ if (I40E_RX_PROG_FCOE_ERROR_CONFLICT(error)) {
+ dev_err(&pf->pdev->dev, "xid %x ddp->xid %x CONFLICT\n",
+ xid, ddp->xid);
+ ddp->prerr |= I40E_RX_PROG_FCOE_ERROR_CONFLICT_BIT;
+ }
+ }
+
+ /* DDP context invalidation status: failure or success */
+ if (prog_id == I40E_RX_PROG_STATUS_DESC_FCOE_CTXT_INVL_STATUS) {
+ if (I40E_RX_PROG_FCOE_ERROR_INVLFAIL(error)) {
+ dev_err(&pf->pdev->dev, "xid %x ddp->xid %x INVALIDATION FAILURE\n",
+ xid, ddp->xid);
+ ddp->prerr |= I40E_RX_PROG_FCOE_ERROR_INVLFAIL_BIT;
+ }
+ /* clear the flag so we can retry invalidation */
+ clear_bit(__I40E_FCOE_DDP_ABORTED, &ddp->flags);
+ }
+
+ /* unmap DMA */
+ i40e_fcoe_ddp_unmap(pf, ddp);
+ i40e_fcoe_ddp_clear(ddp);
+}
+
+/**
+ * i40e_fcoe_handle_offload - check ddp status and mark it done
+ * @adapter: i40e adapter
+ * @rx_desc: advanced rx descriptor
+ * @skb: the skb holding the received data
+ *
+ * This checks ddp status.
+ *
+ * Returns : < 0 indicates an error or not a FCOE ddp, 0 indicates
+ * not passing the skb to ULD, > 0 indicates is the length of data
+ * being ddped.
+ *
+ **/
+int i40e_fcoe_handle_offload(struct i40e_ring *rx_ring,
+ union i40e_rx_desc *rx_desc,
+ struct sk_buff *skb)
+{
+ struct i40e_pf *pf = rx_ring->vsi->back;
+ struct i40e_fcoe *fcoe = &pf->fcoe;
+ struct fc_frame_header *fh = NULL;
+ struct i40e_fcoe_ddp *ddp = NULL;
+ u32 status, fltstat;
+ u32 error, fcerr;
+ int rc = -EINVAL;
+ u16 ptype;
+ u16 xid;
+ u64 qw;
+
+ /* check this rxd is for programming status */
+ qw = le64_to_cpu(rx_desc->wb.qword1.status_error_len);
+ /* packet descriptor, check packet type */
+ ptype = (qw & I40E_RXD_QW1_PTYPE_MASK) >> I40E_RXD_QW1_PTYPE_SHIFT;
+ if (!i40e_rx_is_fcoe(ptype))
+ goto out_no_ddp;
+
+ error = (qw & I40E_RXD_QW1_ERROR_MASK) >> I40E_RXD_QW1_ERROR_SHIFT;
+ fcerr = (error >> I40E_RX_DESC_ERROR_L3L4E_SHIFT) &
+ I40E_RX_DESC_FCOE_ERROR_MASK;
+
+ /* check stateless offload error */
+ if (unlikely(fcerr == I40E_RX_DESC_ERROR_L3L4E_PROT)) {
+ dev_err(&pf->pdev->dev, "Protocol Error\n");
+ skb->ip_summed = CHECKSUM_NONE;
+ } else {
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ }
+
+ /* check hw status on ddp */
+ status = (qw & I40E_RXD_QW1_STATUS_MASK) >> I40E_RXD_QW1_STATUS_SHIFT;
+ fltstat = (status >> I40E_RX_DESC_STATUS_FLTSTAT_SHIFT) &
+ I40E_RX_DESC_FLTSTAT_FCMASK;
+
+ /* now we are ready to check DDP */
+ fh = i40e_fcoe_fc_frame_header(skb);
+ xid = i40e_fcoe_fc_get_xid(fh);
+ if (!i40e_fcoe_xid_is_valid(xid))
+ goto out_no_ddp;
+
+ /* non DDP normal receive, return to the protocol stack */
+ if (fltstat == I40E_RX_DESC_FLTSTAT_NOMTCH)
+ goto out_no_ddp;
+
+ /* do we have a sw ddp context setup ? */
+ ddp = &fcoe->ddp[xid];
+ if (!ddp->sgl)
+ goto out_no_ddp;
+
+ /* fetch xid from hw rxd wb, which should match up the sw ctxt */
+ xid = le16_to_cpu(rx_desc->wb.qword0.lo_dword.mirr_fcoe.fcoe_ctx_id);
+ if (ddp->xid != xid) {
+ dev_err(&pf->pdev->dev, "xid 0x%x does not match ctx_xid 0x%x\n",
+ ddp->xid, xid);
+ goto out_put_ddp;
+ }
+
+ /* the same exchange has already errored out */
+ if (ddp->fcerr) {
+ dev_err(&pf->pdev->dev, "xid 0x%x fcerr 0x%x reported fcer 0x%x\n",
+ xid, ddp->fcerr, fcerr);
+ goto out_put_ddp;
+ }
+
+ /* fcoe param is valid by now with correct DDPed length */
+ ddp->len = le32_to_cpu(rx_desc->wb.qword0.hi_dword.fcoe_param);
+ ddp->fcerr = fcerr;
+ /* header posting only, useful only for target mode and debugging */
+ if (fltstat == I40E_RX_DESC_FLTSTAT_DDP) {
+ /* For target mode, we get header of the last packet but it
+ * does not have the FCoE trailer field, i.e., CRC and EOF
+ * Ordered Set since they are offloaded by the HW, so fill
+ * it up correspondingly to allow the packet to pass through
+ * to the upper protocol stack.
+ */
+ u32 f_ctl = ntoh24(fh->fh_f_ctl);
+
+ if ((f_ctl & FC_FC_END_SEQ) &&
+ (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA)) {
+ struct fcoe_crc_eof *crc = NULL;
+
+ crc = (struct fcoe_crc_eof *)skb_put(skb, sizeof(*crc));
+ crc->fcoe_eof = FC_EOF_T;
+ } else {
+ /* otherwise, drop the header only frame */
+ rc = 0;
+ goto out_no_ddp;
+ }
+ }
+
+out_put_ddp:
+ /* either we got RSP or we have an error, unmap DMA in both cases */
+ i40e_fcoe_ddp_unmap(pf, ddp);
+ if (ddp->len && !ddp->fcerr) {
+ int pkts;
+
+ rc = ddp->len;
+ i40e_fcoe_ddp_clear(ddp);
+ ddp->len = rc;
+ pkts = DIV_ROUND_UP(rc, 2048);
+ rx_ring->stats.bytes += rc;
+ rx_ring->stats.packets += pkts;
+ rx_ring->q_vector->rx.total_bytes += rc;
+ rx_ring->q_vector->rx.total_packets += pkts;
+ set_bit(__I40E_FCOE_DDP_DONE, &ddp->flags);
+ }
+
+out_no_ddp:
+ return rc;
+}
+
+/**
+ * i40e_fcoe_ddp_setup - called to set up ddp context
+ * @netdev: the corresponding net_device
+ * @xid: the exchange id requesting ddp
+ * @sgl: the scatter-gather list for this request
+ * @sgc: the number of scatter-gather items
+ * @target_mode: indicates this is a DDP request for target
+ *
+ * Returns : 1 for success and 0 for no DDP on this I/O
+ **/
+static int i40e_fcoe_ddp_setup(struct net_device *netdev, u16 xid,
+ struct scatterlist *sgl, unsigned int sgc,
+ int target_mode)
+{
+ static const unsigned int bufflen = I40E_FCOE_DDP_BUF_MIN;
+ struct i40e_netdev_priv *np = netdev_priv(netdev);
+ struct i40e_fcoe_ddp_pool *ddp_pool;
+ struct i40e_pf *pf = np->vsi->back;
+ struct i40e_fcoe *fcoe = &pf->fcoe;
+ unsigned int i, j, dmacount;
+ struct i40e_fcoe_ddp *ddp;
+ unsigned int firstoff = 0;
+ unsigned int thisoff = 0;
+ unsigned int thislen = 0;
+ struct scatterlist *sg;
+ dma_addr_t addr = 0;
+ unsigned int len;
+
+ if (xid >= I40E_FCOE_DDP_MAX) {
+ dev_warn(&pf->pdev->dev, "xid=0x%x out-of-range\n", xid);
+ return 0;
+ }
+
+ /* no DDP if we are already down or resetting */
+ if (test_bit(__I40E_DOWN, &pf->state) ||
+ test_bit(__I40E_NEEDS_RESTART, &pf->state)) {
+ dev_info(&pf->pdev->dev, "xid=0x%x device in reset/down\n",
+ xid);
+ return 0;
+ }
+
+ ddp = &fcoe->ddp[xid];
+ if (ddp->sgl) {
+ dev_info(&pf->pdev->dev, "xid 0x%x w/ non-null sgl=%p nents=%d\n",
+ xid, ddp->sgl, ddp->sgc);
+ return 0;
+ }
+ i40e_fcoe_ddp_clear(ddp);
+
+ if (!fcoe->ddp_pool) {
+ dev_info(&pf->pdev->dev, "No DDP pool, xid 0x%x\n", xid);
+ return 0;
+ }
+
+ ddp_pool = per_cpu_ptr(fcoe->ddp_pool, get_cpu());
+ if (!ddp_pool->pool) {
+ dev_info(&pf->pdev->dev, "No percpu ddp pool, xid 0x%x\n", xid);
+ goto out_noddp;
+ }
+
+ /* setup dma from scsi command sgl */
+ dmacount = dma_map_sg(&pf->pdev->dev, sgl, sgc, DMA_FROM_DEVICE);
+ if (dmacount == 0) {
+ dev_info(&pf->pdev->dev, "dma_map_sg for sgl %p, sgc %d failed\n",
+ sgl, sgc);
+ goto out_noddp_unmap;
+ }
+
+ /* alloc the udl from our ddp pool */
+ ddp->udl = dma_pool_alloc(ddp_pool->pool, GFP_ATOMIC, &ddp->udp);
+ if (!ddp->udl) {
+ dev_info(&pf->pdev->dev,
+ "Failed allocated ddp context, xid 0x%x\n", xid);
+ goto out_noddp_unmap;
+ }
+
+ j = 0;
+ ddp->len = 0;
+ for_each_sg(sgl, sg, dmacount, i) {
+ addr = sg_dma_address(sg);
+ len = sg_dma_len(sg);
+ ddp->len += len;
+ while (len) {
+ /* max number of buffers allowed in one DDP context */
+ if (j >= I40E_FCOE_DDP_BUFFCNT_MAX) {
+ dev_info(&pf->pdev->dev,
+ "xid=%x:%d,%d,%d:addr=%llx not enough descriptors\n",
+ xid, i, j, dmacount, (u64)addr);
+ goto out_noddp_free;
+ }
+
+ /* get the offset of length of current buffer */
+ thisoff = addr & ((dma_addr_t)bufflen - 1);
+ thislen = min_t(unsigned int, (bufflen - thisoff), len);
+ /* all but the 1st buffer (j == 0)
+ * must be aligned on bufflen
+ */
+ if ((j != 0) && (thisoff))
+ goto out_noddp_free;
+
+ /* all but the last buffer
+ * ((i == (dmacount - 1)) && (thislen == len))
+ * must end at bufflen
+ */
+ if (((i != (dmacount - 1)) || (thislen != len)) &&
+ ((thislen + thisoff) != bufflen))
+ goto out_noddp_free;
+
+ ddp->udl[j] = (u64)(addr - thisoff);
+ /* only the first buffer may have none-zero offset */
+ if (j == 0)
+ firstoff = thisoff;
+ len -= thislen;
+ addr += thislen;
+ j++;
+ }
+ }
+ /* only the last buffer may have non-full bufflen */
+ ddp->lastsize = thisoff + thislen;
+ ddp->firstoff = firstoff;
+ ddp->list_len = j;
+ ddp->pool = ddp_pool->pool;
+ ddp->sgl = sgl;
+ ddp->sgc = sgc;
+ ddp->xid = xid;
+ if (target_mode)
+ set_bit(__I40E_FCOE_DDP_TARGET, &ddp->flags);
+ set_bit(__I40E_FCOE_DDP_INITALIZED, &ddp->flags);
+
+ put_cpu();
+ return 1; /* Success */
+
+out_noddp_free:
+ dma_pool_free(ddp->pool, ddp->udl, ddp->udp);
+ i40e_fcoe_ddp_clear(ddp);
+
+out_noddp_unmap:
+ dma_unmap_sg(&pf->pdev->dev, sgl, sgc, DMA_FROM_DEVICE);
+out_noddp:
+ put_cpu();
+ return 0;
+}
+
+/**
+ * i40e_fcoe_ddp_get - called to set up ddp context in initiator mode
+ * @netdev: the corresponding net_device
+ * @xid: the exchange id requesting ddp
+ * @sgl: the scatter-gather list for this request
+ * @sgc: the number of scatter-gather items
+ *
+ * This is the implementation of net_device_ops.ndo_fcoe_ddp_setup
+ * and is expected to be called from ULD, e.g., FCP layer of libfc
+ * to set up ddp for the corresponding xid of the given sglist for
+ * the corresponding I/O.
+ *
+ * Returns : 1 for success and 0 for no ddp
+ **/
+static int i40e_fcoe_ddp_get(struct net_device *netdev, u16 xid,
+ struct scatterlist *sgl, unsigned int sgc)
+{
+ return i40e_fcoe_ddp_setup(netdev, xid, sgl, sgc, 0);
+}
+
+/**
+ * i40e_fcoe_ddp_target - called to set up ddp context in target mode
+ * @netdev: the corresponding net_device
+ * @xid: the exchange id requesting ddp
+ * @sgl: the scatter-gather list for this request
+ * @sgc: the number of scatter-gather items
+ *
+ * This is the implementation of net_device_ops.ndo_fcoe_ddp_target
+ * and is expected to be called from ULD, e.g., FCP layer of libfc
+ * to set up ddp for the corresponding xid of the given sglist for
+ * the corresponding I/O. The DDP in target mode is a write I/O request
+ * from the initiator.
+ *
+ * Returns : 1 for success and 0 for no ddp
+ **/
+static int i40e_fcoe_ddp_target(struct net_device *netdev, u16 xid,
+ struct scatterlist *sgl, unsigned int sgc)
+{
+ return i40e_fcoe_ddp_setup(netdev, xid, sgl, sgc, 1);
+}
+
+/**
+ * i40e_fcoe_program_ddp - programs the HW DDP related descriptors
+ * @tx_ring: transmit ring for this packet
+ * @skb: the packet to be sent out
+ * @sof: the SOF to indicate class of service
+ *
+ * Determine if it is READ/WRITE command, and finds out if there is
+ * a matching SW DDP context for this command. DDP is applicable
+ * only in case of READ if initiator or WRITE in case of
+ * responder (via checking XFER_RDY).
+ *
+ * Note: caller checks sof and ddp sw context
+ *
+ * Returns : none
+ *
+ **/
+static void i40e_fcoe_program_ddp(struct i40e_ring *tx_ring,
+ struct sk_buff *skb,
+ struct i40e_fcoe_ddp *ddp, u8 sof)
+{
+ struct i40e_fcoe_filter_context_desc *filter_desc = NULL;
+ struct i40e_fcoe_queue_context_desc *queue_desc = NULL;
+ struct i40e_fcoe_ddp_context_desc *ddp_desc = NULL;
+ struct i40e_pf *pf = tx_ring->vsi->back;
+ u16 i = tx_ring->next_to_use;
+ struct fc_frame_header *fh;
+ u64 flags_rsvd_lanq = 0;
+ bool target_mode;
+
+ /* check if abort is still pending */
+ if (test_bit(__I40E_FCOE_DDP_ABORTED, &ddp->flags)) {
+ dev_warn(&pf->pdev->dev,
+ "DDP abort is still pending xid:%hx and ddp->flags:%lx:\n",
+ ddp->xid, ddp->flags);
+ return;
+ }
+
+ /* set the flag to indicate this is programmed */
+ if (test_and_set_bit(__I40E_FCOE_DDP_PROGRAMMED, &ddp->flags)) {
+ dev_warn(&pf->pdev->dev,
+ "DDP is already programmed for xid:%hx and ddp->flags:%lx:\n",
+ ddp->xid, ddp->flags);
+ return;
+ }
+
+ /* Prepare the DDP context descriptor */
+ ddp_desc = I40E_DDP_CONTEXT_DESC(tx_ring, i);
+ i++;
+ if (i == tx_ring->count)
+ i = 0;
+
+ ddp_desc->type_cmd_foff_lsize =
+ cpu_to_le64(I40E_TX_DESC_DTYPE_DDP_CTX |
+ ((u64)I40E_FCOE_DDP_CTX_DESC_BSIZE_4K <<
+ I40E_FCOE_DDP_CTX_QW1_CMD_SHIFT) |
+ ((u64)ddp->firstoff <<
+ I40E_FCOE_DDP_CTX_QW1_FOFF_SHIFT) |
+ ((u64)ddp->lastsize <<
+ I40E_FCOE_DDP_CTX_QW1_LSIZE_SHIFT));
+ ddp_desc->rsvd = cpu_to_le64(0);
+
+ /* target mode needs last packet in the sequence */
+ target_mode = test_bit(__I40E_FCOE_DDP_TARGET, &ddp->flags);
+ if (target_mode)
+ ddp_desc->type_cmd_foff_lsize |=
+ cpu_to_le64(I40E_FCOE_DDP_CTX_DESC_LASTSEQH);
+
+ /* Prepare queue_context descriptor */
+ queue_desc = I40E_QUEUE_CONTEXT_DESC(tx_ring, i++);
+ if (i == tx_ring->count)
+ i = 0;
+ queue_desc->dmaindx_fbase = cpu_to_le64(ddp->xid | ((u64)ddp->udp));
+ queue_desc->flen_tph = cpu_to_le64(ddp->list_len |
+ ((u64)(I40E_FCOE_QUEUE_CTX_DESC_TPHRDESC |
+ I40E_FCOE_QUEUE_CTX_DESC_TPHDATA) <<
+ I40E_FCOE_QUEUE_CTX_QW1_TPH_SHIFT));
+
+ /* Prepare filter_context_desc */
+ filter_desc = I40E_FILTER_CONTEXT_DESC(tx_ring, i);
+ i++;
+ if (i == tx_ring->count)
+ i = 0;
+
+ fh = (struct fc_frame_header *)skb_transport_header(skb);
+ filter_desc->param = cpu_to_le32(ntohl(fh->fh_parm_offset));
+ filter_desc->seqn = cpu_to_le16(ntohs(fh->fh_seq_cnt));
+ filter_desc->rsvd_dmaindx = cpu_to_le16(ddp->xid <<
+ I40E_FCOE_FILTER_CTX_QW0_DMAINDX_SHIFT);
+
+ flags_rsvd_lanq = I40E_FCOE_FILTER_CTX_DESC_CTYP_DDP;
+ flags_rsvd_lanq |= (u64)(target_mode ?
+ I40E_FCOE_FILTER_CTX_DESC_ENODE_RSP :
+ I40E_FCOE_FILTER_CTX_DESC_ENODE_INIT);
+
+ flags_rsvd_lanq |= (u64)((sof == FC_SOF_I2 || sof == FC_SOF_N2) ?
+ I40E_FCOE_FILTER_CTX_DESC_FC_CLASS2 :
+ I40E_FCOE_FILTER_CTX_DESC_FC_CLASS3);
+
+ flags_rsvd_lanq |= ((u64)skb->queue_mapping <<
+ I40E_FCOE_FILTER_CTX_QW1_LANQINDX_SHIFT);
+ filter_desc->flags_rsvd_lanq = cpu_to_le64(flags_rsvd_lanq);
+
+ /* By this time, all offload related descriptors has been programmed */
+ tx_ring->next_to_use = i;
+}
+
+/**
+ * i40e_fcoe_invalidate_ddp - invalidates DDP in case of abort
+ * @tx_ring: transmit ring for this packet
+ * @skb: the packet associated w/ this DDP invalidation, i.e., ABTS
+ * @ddp: the SW DDP context for this DDP
+ *
+ * Programs the Tx context descriptor to do DDP invalidation.
+ **/
+static void i40e_fcoe_invalidate_ddp(struct i40e_ring *tx_ring,
+ struct sk_buff *skb,
+ struct i40e_fcoe_ddp *ddp)
+{
+ struct i40e_tx_context_desc *context_desc;
+ int i;
+
+ if (test_and_set_bit(__I40E_FCOE_DDP_ABORTED, &ddp->flags))
+ return;
+
+ i = tx_ring->next_to_use;
+ context_desc = I40E_TX_CTXTDESC(tx_ring, i);
+ i++;
+ if (i == tx_ring->count)
+ i = 0;
+
+ context_desc->tunneling_params = cpu_to_le32(0);
+ context_desc->l2tag2 = cpu_to_le16(0);
+ context_desc->rsvd = cpu_to_le16(0);
+ context_desc->type_cmd_tso_mss = cpu_to_le64(
+ I40E_TX_DESC_DTYPE_FCOE_CTX |
+ (I40E_FCOE_TX_CTX_DESC_OPCODE_DDP_CTX_INVL <<
+ I40E_TXD_CTX_QW1_CMD_SHIFT) |
+ (I40E_FCOE_TX_CTX_DESC_OPCODE_SINGLE_SEND <<
+ I40E_TXD_CTX_QW1_CMD_SHIFT));
+ tx_ring->next_to_use = i;
+}
+
+/**
+ * i40e_fcoe_handle_ddp - check we should setup or invalidate DDP
+ * @tx_ring: transmit ring for this packet
+ * @skb: the packet to be sent out
+ * @sof: the SOF to indicate class of service
+ *
+ * Determine if it is ABTS/READ/XFER_RDY, and finds out if there is
+ * a matching SW DDP context for this command. DDP is applicable
+ * only in case of READ if initiator or WRITE in case of
+ * responder (via checking XFER_RDY). In case this is an ABTS, send
+ * just invalidate the context.
+ **/
+static void i40e_fcoe_handle_ddp(struct i40e_ring *tx_ring,
+ struct sk_buff *skb, u8 sof)
+{
+ struct i40e_pf *pf = tx_ring->vsi->back;
+ struct i40e_fcoe *fcoe = &pf->fcoe;
+ struct fc_frame_header *fh;
+ struct i40e_fcoe_ddp *ddp;
+ u32 f_ctl;
+ u8 r_ctl;
+ u16 xid;
+
+ fh = (struct fc_frame_header *)skb_transport_header(skb);
+ f_ctl = ntoh24(fh->fh_f_ctl);
+ r_ctl = fh->fh_r_ctl;
+ ddp = NULL;
+
+ if ((r_ctl == FC_RCTL_DD_DATA_DESC) && (f_ctl & FC_FC_EX_CTX)) {
+ /* exchange responder? if so, XFER_RDY for write */
+ xid = ntohs(fh->fh_rx_id);
+ if (i40e_fcoe_xid_is_valid(xid)) {
+ ddp = &fcoe->ddp[xid];
+ if ((ddp->xid == xid) &&
+ (test_bit(__I40E_FCOE_DDP_TARGET, &ddp->flags)))
+ i40e_fcoe_program_ddp(tx_ring, skb, ddp, sof);
+ }
+ } else if (r_ctl == FC_RCTL_DD_UNSOL_CMD) {
+ /* exchange originator, check READ cmd */
+ xid = ntohs(fh->fh_ox_id);
+ if (i40e_fcoe_xid_is_valid(xid)) {
+ ddp = &fcoe->ddp[xid];
+ if ((ddp->xid == xid) &&
+ (!test_bit(__I40E_FCOE_DDP_TARGET, &ddp->flags)))
+ i40e_fcoe_program_ddp(tx_ring, skb, ddp, sof);
+ }
+ } else if (r_ctl == FC_RCTL_BA_ABTS) {
+ /* exchange originator, check ABTS */
+ xid = ntohs(fh->fh_ox_id);
+ if (i40e_fcoe_xid_is_valid(xid)) {
+ ddp = &fcoe->ddp[xid];
+ if ((ddp->xid == xid) &&
+ (!test_bit(__I40E_FCOE_DDP_TARGET, &ddp->flags)))
+ i40e_fcoe_invalidate_ddp(tx_ring, skb, ddp);
+ }
+ }
+}
+
+/**
+ * i40e_fcoe_tso - set up FCoE TSO
+ * @tx_ring: ring to send buffer on
+ * @skb: send buffer
+ * @tx_flags: collected send information
+ * @hdr_len: the tso header length
+ * @sof: the SOF to indicate class of service
+ *
+ * Note must already have sof checked to be either class 2 or class 3 before
+ * calling this function.
+ *
+ * Returns 1 to indicate sequence segmentation offload is properly setup
+ * or returns 0 to indicate no tso is needed, otherwise returns error
+ * code to drop the frame.
+ **/
+static int i40e_fcoe_tso(struct i40e_ring *tx_ring,
+ struct sk_buff *skb,
+ u32 tx_flags, u8 *hdr_len, u8 sof)
+{
+ struct i40e_tx_context_desc *context_desc;
+ u32 cd_type, cd_cmd, cd_tso_len, cd_mss;
+ struct fc_frame_header *fh;
+ u64 cd_type_cmd_tso_mss;
+
+ /* must match gso type as FCoE */
+ if (!skb_is_gso(skb))
+ return 0;
+
+ /* is it the expected gso type for FCoE ?*/
+ if (skb_shinfo(skb)->gso_type != SKB_GSO_FCOE) {
+ netdev_err(skb->dev,
+ "wrong gso type %d:expecting SKB_GSO_FCOE\n",
+ skb_shinfo(skb)->gso_type);
+ return -EINVAL;
+ }
+
+ /* header and trailer are inserted by hw */
+ *hdr_len = skb_transport_offset(skb) + sizeof(struct fc_frame_header) +
+ sizeof(struct fcoe_crc_eof);
+
+ /* check sof to decide a class 2 or 3 TSO */
+ if (likely(i40e_fcoe_sof_is_class3(sof)))
+ cd_cmd = I40E_FCOE_TX_CTX_DESC_OPCODE_TSO_FC_CLASS3;
+ else
+ cd_cmd = I40E_FCOE_TX_CTX_DESC_OPCODE_TSO_FC_CLASS2;
+
+ /* param field valid? */
+ fh = (struct fc_frame_header *)skb_transport_header(skb);
+ if (fh->fh_f_ctl[2] & FC_FC_REL_OFF)
+ cd_cmd |= I40E_FCOE_TX_CTX_DESC_RELOFF;
+
+ /* fill the field values */
+ cd_type = I40E_TX_DESC_DTYPE_FCOE_CTX;
+ cd_tso_len = skb->len - *hdr_len;
+ cd_mss = skb_shinfo(skb)->gso_size;
+ cd_type_cmd_tso_mss =
+ ((u64)cd_type << I40E_TXD_CTX_QW1_DTYPE_SHIFT) |
+ ((u64)cd_cmd << I40E_TXD_CTX_QW1_CMD_SHIFT) |
+ ((u64)cd_tso_len << I40E_TXD_CTX_QW1_TSO_LEN_SHIFT) |
+ ((u64)cd_mss << I40E_TXD_CTX_QW1_MSS_SHIFT);
+
+ /* grab the next descriptor */
+ context_desc = I40E_TX_CTXTDESC(tx_ring, tx_ring->next_to_use);
+ tx_ring->next_to_use++;
+ if (tx_ring->next_to_use == tx_ring->count)
+ tx_ring->next_to_use = 0;
+
+ context_desc->tunneling_params = 0;
+ context_desc->l2tag2 = cpu_to_le16((tx_flags & I40E_TX_FLAGS_VLAN_MASK)
+ >> I40E_TX_FLAGS_VLAN_SHIFT);
+ context_desc->type_cmd_tso_mss = cpu_to_le64(cd_type_cmd_tso_mss);
+
+ return 1;
+}
+
+/**
+ * i40e_fcoe_tx_map - build the tx descriptor
+ * @tx_ring: ring to send buffer on
+ * @skb: send buffer
+ * @first: first buffer info buffer to use
+ * @tx_flags: collected send information
+ * @hdr_len: ptr to the size of the packet header
+ * @eof: the frame eof value
+ *
+ * Note, for FCoE, sof and eof are already checked
+ **/
+static void i40e_fcoe_tx_map(struct i40e_ring *tx_ring,
+ struct sk_buff *skb,
+ struct i40e_tx_buffer *first,
+ u32 tx_flags, u8 hdr_len, u8 eof)
+{
+ u32 td_offset = 0;
+ u32 td_cmd = 0;
+ u32 maclen;
+
+ /* insert CRC */
+ td_cmd = I40E_TX_DESC_CMD_ICRC;
+
+ /* setup MACLEN */
+ maclen = skb_network_offset(skb);
+ if (tx_flags & I40E_TX_FLAGS_SW_VLAN)
+ maclen += sizeof(struct vlan_hdr);
+
+ if (skb->protocol == htons(ETH_P_FCOE)) {
+ /* for FCoE, maclen should exclude ether type */
+ maclen -= 2;
+ /* setup type as FCoE and EOF insertion */
+ td_cmd |= (I40E_TX_DESC_CMD_FCOET | i40e_fcoe_ctxt_eof(eof));
+ /* setup FCoELEN and FCLEN */
+ td_offset |= ((((sizeof(struct fcoe_hdr) + 2) >> 2) <<
+ I40E_TX_DESC_LENGTH_IPLEN_SHIFT) |
+ ((sizeof(struct fc_frame_header) >> 2) <<
+ I40E_TX_DESC_LENGTH_L4_FC_LEN_SHIFT));
+ /* trim to exclude trailer */
+ pskb_trim(skb, skb->len - sizeof(struct fcoe_crc_eof));
+ }
+
+ /* MACLEN is ether header length in words not bytes */
+ td_offset |= (maclen >> 1) << I40E_TX_DESC_LENGTH_MACLEN_SHIFT;
+
+ return i40e_tx_map(tx_ring, skb, first, tx_flags, hdr_len,
+ td_cmd, td_offset);
+}
+
+/**
+ * i40e_fcoe_set_skb_header - adjust skb header point for FIP/FCoE/FC
+ * @skb: the skb to be adjusted
+ *
+ * Returns true if this skb is a FCoE/FIP or VLAN carried FCoE/FIP and then
+ * adjusts the skb header pointers correspondingly. Otherwise, returns false.
+ **/
+static inline int i40e_fcoe_set_skb_header(struct sk_buff *skb)
+{
+ __be16 protocol = skb->protocol;
+
+ skb_reset_mac_header(skb);
+ skb->mac_len = sizeof(struct ethhdr);
+ if (protocol == htons(ETH_P_8021Q)) {
+ struct vlan_ethhdr *veth = (struct vlan_ethhdr *)eth_hdr(skb);
+
+ protocol = veth->h_vlan_encapsulated_proto;
+ skb->mac_len += sizeof(struct vlan_hdr);
+ }
+
+ /* FCoE or FIP only */
+ if ((protocol != htons(ETH_P_FIP)) &&
+ (protocol != htons(ETH_P_FCOE)))
+ return -EINVAL;
+
+ /* set header to L2 of FCoE/FIP */
+ skb_set_network_header(skb, skb->mac_len);
+ if (protocol == htons(ETH_P_FIP))
+ return 0;
+
+ /* set header to L3 of FC */
+ skb_set_transport_header(skb, skb->mac_len + sizeof(struct fcoe_hdr));
+ return 0;
+}
+
+/**
+ * i40e_fcoe_xmit_frame - transmit buffer
+ * @skb: send buffer
+ * @netdev: the fcoe netdev
+ *
+ * Returns 0 if sent, else an error code
+ **/
+static netdev_tx_t i40e_fcoe_xmit_frame(struct sk_buff *skb,
+ struct net_device *netdev)
+{
+ struct i40e_netdev_priv *np = netdev_priv(skb->dev);
+ struct i40e_vsi *vsi = np->vsi;
+ struct i40e_ring *tx_ring = vsi->tx_rings[skb->queue_mapping];
+ struct i40e_tx_buffer *first;
+ __be16 protocol = skb->protocol;
+
+ u32 tx_flags = 0;
+ u8 hdr_len = 0;
+ u8 sof = 0;
+ u8 eof = 0;
+ int fso;
+
+ if (i40e_fcoe_set_skb_header(skb))
+ goto out_drop;
+
+ if (!i40e_xmit_descriptor_count(skb, tx_ring))
+ return NETDEV_TX_BUSY;
+
+ /* prepare the xmit flags */
+ if (i40e_tx_prepare_vlan_flags(skb, tx_ring, &tx_flags))
+ goto out_drop;
+
+ /* record the location of the first descriptor for this packet */
+ first = &tx_ring->tx_bi[tx_ring->next_to_use];
+
+ if (protocol == htons(ETH_P_8021Q)) {
+ struct vlan_ethhdr *veth = (struct vlan_ethhdr *)eth_hdr(skb);
+
+ protocol = veth->h_vlan_encapsulated_proto;
+ }
+ /* FIP is a regular L2 traffic w/o offload */
+ if (protocol == htons(ETH_P_FIP))
+ goto out_send;
+
+ /* check sof and eof, only supports FC Class 2 or 3 */
+ if (i40e_fcoe_fc_sof(skb, &sof) || i40e_fcoe_fc_eof(skb, &eof)) {
+ netdev_err(netdev, "SOF/EOF error:%02x - %02x\n", sof, eof);
+ goto out_drop;
+ }
+
+ /* always do FCCRC for FCoE */
+ tx_flags |= I40E_TX_FLAGS_FCCRC;
+
+ /* check we should do sequence offload */
+ fso = i40e_fcoe_tso(tx_ring, skb, tx_flags, &hdr_len, sof);
+ if (fso < 0)
+ goto out_drop;
+ else if (fso)
+ tx_flags |= I40E_TX_FLAGS_FSO;
+ else
+ i40e_fcoe_handle_ddp(tx_ring, skb, sof);
+
+out_send:
+ /* send out the packet */
+ i40e_fcoe_tx_map(tx_ring, skb, first, tx_flags, hdr_len, eof);
+
+ i40e_maybe_stop_tx(tx_ring, DESC_NEEDED);
+ return NETDEV_TX_OK;
+
+out_drop:
+ dev_kfree_skb_any(skb);
+ return NETDEV_TX_OK;
+}
+
+/**
+ * i40e_fcoe_change_mtu - NDO callback to change the Maximum Transfer Unit
+ * @netdev: network interface device structure
+ * @new_mtu: new value for maximum frame size
+ *
+ * Returns error as operation not permitted
+ *
+ **/
+static int i40e_fcoe_change_mtu(struct net_device *netdev, int new_mtu)
+{
+ netdev_warn(netdev, "MTU change is not supported on FCoE interfaces\n");
+ return -EPERM;
+}
+
+/**
+ * i40e_fcoe_set_features - set the netdev feature flags
+ * @netdev: ptr to the netdev being adjusted
+ * @features: the feature set that the stack is suggesting
+ *
+ **/
+static int i40e_fcoe_set_features(struct net_device *netdev,
+ netdev_features_t features)
+{
+ struct i40e_netdev_priv *np = netdev_priv(netdev);
+ struct i40e_vsi *vsi = np->vsi;
+
+ if (features & NETIF_F_HW_VLAN_CTAG_RX)
+ i40e_vlan_stripping_enable(vsi);
+ else
+ i40e_vlan_stripping_disable(vsi);
+
+ return 0;
+}
+
+
+static const struct net_device_ops i40e_fcoe_netdev_ops = {
+ .ndo_open = i40e_open,
+ .ndo_stop = i40e_close,
+ .ndo_get_stats64 = i40e_get_netdev_stats_struct,
+ .ndo_set_rx_mode = i40e_set_rx_mode,
+ .ndo_validate_addr = eth_validate_addr,
+ .ndo_set_mac_address = i40e_set_mac,
+ .ndo_change_mtu = i40e_fcoe_change_mtu,
+ .ndo_do_ioctl = i40e_ioctl,
+ .ndo_tx_timeout = i40e_tx_timeout,
+ .ndo_vlan_rx_add_vid = i40e_vlan_rx_add_vid,
+ .ndo_vlan_rx_kill_vid = i40e_vlan_rx_kill_vid,
+ .ndo_setup_tc = i40e_setup_tc,
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+ .ndo_poll_controller = i40e_netpoll,
+#endif
+ .ndo_start_xmit = i40e_fcoe_xmit_frame,
+ .ndo_fcoe_enable = i40e_fcoe_enable,
+ .ndo_fcoe_disable = i40e_fcoe_disable,
+ .ndo_fcoe_ddp_setup = i40e_fcoe_ddp_get,
+ .ndo_fcoe_ddp_done = i40e_fcoe_ddp_put,
+ .ndo_fcoe_ddp_target = i40e_fcoe_ddp_target,
+ .ndo_set_features = i40e_fcoe_set_features,
+};
+
+/**
+ * i40e_fcoe_config_netdev - prepares the VSI context for creating a FCoE VSI
+ * @vsi: pointer to the associated VSI struct
+ * @ctxt: pointer to the associated VSI context to be passed to HW
+ *
+ * Returns 0 on success or < 0 on error
+ **/
+void i40e_fcoe_config_netdev(struct net_device *netdev, struct i40e_vsi *vsi)
+{
+ struct i40e_hw *hw = &vsi->back->hw;
+ struct i40e_pf *pf = vsi->back;
+
+ if (vsi->type != I40E_VSI_FCOE)
+ return;
+
+ netdev->features = (NETIF_F_HW_VLAN_CTAG_TX |
+ NETIF_F_HW_VLAN_CTAG_RX |
+ NETIF_F_HW_VLAN_CTAG_FILTER);
+
+ netdev->vlan_features = netdev->features;
+ netdev->vlan_features &= ~(NETIF_F_HW_VLAN_CTAG_TX |
+ NETIF_F_HW_VLAN_CTAG_RX |
+ NETIF_F_HW_VLAN_CTAG_FILTER);
+ netdev->fcoe_ddp_xid = I40E_FCOE_DDP_MAX - 1;
+ netdev->features |= NETIF_F_ALL_FCOE;
+ netdev->vlan_features |= NETIF_F_ALL_FCOE;
+ netdev->hw_features |= netdev->features;
+ netdev->priv_flags |= IFF_UNICAST_FLT;
+ netdev->priv_flags |= IFF_SUPP_NOFCS;
+
+ strlcpy(netdev->name, "fcoe%d", IFNAMSIZ-1);
+ netdev->mtu = FCOE_MTU;
+ SET_NETDEV_DEV(netdev, &pf->pdev->dev);
+ i40e_add_filter(vsi, hw->mac.san_addr, 0, false, false);
+ i40e_add_filter(vsi, (u8[6]) FC_FCOE_FLOGI_MAC, 0, false, false);
+ i40e_add_filter(vsi, FIP_ALL_FCOE_MACS, 0, false, false);
+ i40e_add_filter(vsi, FIP_ALL_ENODE_MACS, 0, false, false);
+ i40e_add_filter(vsi, FIP_ALL_VN2VN_MACS, 0, false, false);
+ i40e_add_filter(vsi, FIP_ALL_P2P_MACS, 0, false, false);
+
+ /* use san mac */
+ ether_addr_copy(netdev->dev_addr, hw->mac.san_addr);
+ ether_addr_copy(netdev->perm_addr, hw->mac.san_addr);
+ /* fcoe netdev ops */
+ netdev->netdev_ops = &i40e_fcoe_netdev_ops;
+}
+
+/**
+ * i40e_fcoe_vsi_setup - allocate and set up FCoE VSI
+ * @pf: the pf that VSI is associated with
+ *
+ **/
+void i40e_fcoe_vsi_setup(struct i40e_pf *pf)
+{
+ struct i40e_vsi *vsi;
+ u16 seid;
+ int i;
+
+ if (!(pf->flags & I40E_FLAG_FCOE_ENABLED))
+ return;
+
+ BUG_ON(!pf->vsi[pf->lan_vsi]);
+
+ for (i = 0; i < pf->num_alloc_vsi; i++) {
+ vsi = pf->vsi[i];
+ if (vsi && vsi->type == I40E_VSI_FCOE) {
+ dev_warn(&pf->pdev->dev,
+ "FCoE VSI already created\n");
+ return;
+ }
+ }
+
+ seid = pf->vsi[pf->lan_vsi]->seid;
+ vsi = i40e_vsi_setup(pf, I40E_VSI_FCOE, seid, 0);
+ if (vsi) {
+ dev_dbg(&pf->pdev->dev,
+ "Successfully created FCoE VSI seid %d id %d uplink_seid %d pf seid %d\n",
+ vsi->seid, vsi->id, vsi->uplink_seid, seid);
+ } else {
+ dev_info(&pf->pdev->dev, "Failed to create FCoE VSI\n");
+ }
+}
projects / GitHub / MotorolaMobilityLLC / kernel-slsi.git / commitdiff