/******************************************************************************* * * Intel Ethernet Controller XL710 Family Linux Driver * Copyright(c) 2013 - 2016 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 . * * The full GNU General Public License is included in this distribution in * the file called "COPYING". * * Contact Information: * e1000-devel Mailing List * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 * ******************************************************************************/ #include #include #include #include #include #include #include #include #include #include "i40e.h" #include "i40e_fcoe.h" /** * 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 and that already checks for all supported valid eof values. **/ 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: /* Supported valid eof shall be already checked by * calling i40e_fcoe_eof_is_supported() first, * therefore this default case shall never hit. */ WARN_ON(1); return -EINVAL; } } /** * 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 **/ void 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_dbg(&pf->pdev->dev, "FCoE capability is disabled\n"); return; } if (!pf->hw.func_caps.dcb) { dev_warn(&pf->pdev->dev, "Hardware is not DCB capable not enabling FCoE.\n"); return; } /* enable FCoE hash filter */ val = i40e_read_rx_ctl(hw, I40E_PFQF_HENA(1)); val |= BIT(I40E_FILTER_PCTYPE_FCOE_OX - 32); val |= BIT(I40E_FILTER_PCTYPE_FCOE_RX - 32); val &= I40E_PFQF_HENA_PTYPE_ENA_MASK; i40e_write_rx_ctl(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 = BIT(I40E_DMA_CNTX_SIZE_4K) * I40E_DMA_CNTX_BASE_SIZE; pf->fcoe_hmc_filt_num = pf->fcoe_hmc_cntx_num + BIT(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 = i40e_read_rx_ctl(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); i40e_write_rx_ctl(hw, I40E_GLFCOE_RCTL, val); dev_info(&pf->pdev->dev, "FCoE is supported.\n"); } /** * 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_dcb_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 |= BIT(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 = I40E_AQ_VSI_CONN_TYPE_NORMAL; ctxt->flags = I40E_AQ_VSI_TYPE_PF; /* FCoE VSI would need the following sections */ info->valid_sections |= cpu_to_le16(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)); if (i40e_is_vsi_uplink_mode_veb(vsi)) { info->valid_sections |= cpu_to_le16(I40E_AQ_VSI_PROP_SWITCH_VALID); info->switch_id = cpu_to_le16(I40E_AQ_VSI_SW_ID_FLAG_ALLOW_LB); } 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 = 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; 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; u32 tx_flags = 0; int fso, count; u8 hdr_len = 0; u8 sof = 0; u8 eof = 0; if (i40e_fcoe_set_skb_header(skb)) goto out_drop; count = i40e_xmit_descriptor_count(skb); if (i40e_chk_linearize(skb, count)) { if (__skb_linearize(skb)) goto out_drop; count = i40e_txd_use_count(skb->len); tx_ring->tx_stats.tx_linearize++; } /* need: 1 descriptor per page * PAGE_SIZE/I40E_MAX_DATA_PER_TXD, * + 1 desc for skb_head_len/I40E_MAX_DATA_PER_TXD, * + 4 desc gap to avoid the cache line where head is, * + 1 desc for context descriptor, * otherwise try next time */ if (i40e_maybe_stop_tx(tx_ring, count + 4 + 1)) { tx_ring->tx_stats.tx_busy++; 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]; /* FIP is a regular L2 traffic w/o offload */ if (skb->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, }; /* fcoe network device type */ static struct device_type fcoe_netdev_type = { .name = "fcoe", }; /** * 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); SET_NETDEV_DEVTYPE(netdev, &fcoe_netdev_type); /* set different dev_port value 1 for FCoE netdev than the default * zero dev_port value for PF netdev, this helps biosdevname user * tool to differentiate them correctly while both attached to the * same PCI function. */ netdev->dev_port = 1; spin_lock_bh(&vsi->mac_filter_hash_lock); i40e_add_filter(vsi, hw->mac.san_addr, 0); i40e_add_filter(vsi, (u8[6]) FC_FCOE_FLOGI_MAC, 0); i40e_add_filter(vsi, FIP_ALL_FCOE_MACS, 0); i40e_add_filter(vsi, FIP_ALL_ENODE_MACS, 0); spin_unlock_bh(&vsi->mac_filter_hash_lock); /* 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; 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"); } }