diff options
Diffstat (limited to 'drivers/net/ethernet/intel/i40e/i40e_fcoe.c')
| -rw-r--r-- | drivers/net/ethernet/intel/i40e/i40e_fcoe.c | 1561 |
1 files changed, 1561 insertions, 0 deletions
diff --git a/drivers/net/ethernet/intel/i40e/i40e_fcoe.c b/drivers/net/ethernet/intel/i40e/i40e_fcoe.c new file mode 100644 index 000000000000..6938fc1ad877 --- /dev/null +++ b/drivers/net/ethernet/intel/i40e/i40e_fcoe.c @@ -0,0 +1,1561 @@ +/******************************************************************************* + * + * 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; + 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]; + + /* 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, +}; + +/** + * 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"); + } +} |