linux/drivers/net/ethernet/intel/i40e/i40e_fcoe.c
<<
>>
Prefs
   1/*******************************************************************************
   2 *
   3 * Intel Ethernet Controller XL710 Family Linux Driver
   4 * Copyright(c) 2013 - 2016 Intel Corporation.
   5 *
   6 * This program is free software; you can redistribute it and/or modify it
   7 * under the terms and conditions of the GNU General Public License,
   8 * version 2, as published by the Free Software Foundation.
   9 *
  10 * This program is distributed in the hope it will be useful, but WITHOUT
  11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13 * more details.
  14 *
  15 * You should have received a copy of the GNU General Public License along
  16 * with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 *
  18 * The full GNU General Public License is included in this distribution in
  19 * the file called "COPYING".
  20 *
  21 * Contact Information:
  22 * e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  23 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  24 *
  25 ******************************************************************************/
  26
  27#include <linux/if_ether.h>
  28#include <scsi/scsi_cmnd.h>
  29#include <scsi/scsi_device.h>
  30#include <scsi/fc/fc_fs.h>
  31#include <scsi/fc/fc_fip.h>
  32#include <scsi/fc/fc_fcoe.h>
  33#include <scsi/libfc.h>
  34#include <scsi/libfcoe.h>
  35#include <uapi/linux/dcbnl.h>
  36
  37#include "i40e.h"
  38#include "i40e_fcoe.h"
  39
  40/**
  41 * i40e_fcoe_sof_is_class2 - returns true if this is a FC Class 2 SOF
  42 * @sof: the FCoE start of frame delimiter
  43 **/
  44static inline bool i40e_fcoe_sof_is_class2(u8 sof)
  45{
  46        return (sof == FC_SOF_I2) || (sof == FC_SOF_N2);
  47}
  48
  49/**
  50 * i40e_fcoe_sof_is_class3 - returns true if this is a FC Class 3 SOF
  51 * @sof: the FCoE start of frame delimiter
  52 **/
  53static inline bool i40e_fcoe_sof_is_class3(u8 sof)
  54{
  55        return (sof == FC_SOF_I3) || (sof == FC_SOF_N3);
  56}
  57
  58/**
  59 * i40e_fcoe_sof_is_supported - returns true if the FC SOF is supported by HW
  60 * @sof: the input SOF value from the frame
  61 **/
  62static inline bool i40e_fcoe_sof_is_supported(u8 sof)
  63{
  64        return i40e_fcoe_sof_is_class2(sof) ||
  65               i40e_fcoe_sof_is_class3(sof);
  66}
  67
  68/**
  69 * i40e_fcoe_fc_sof - pull the SOF from FCoE header in the frame
  70 * @skb: the frame whose EOF is to be pulled from
  71 **/
  72static inline int i40e_fcoe_fc_sof(struct sk_buff *skb, u8 *sof)
  73{
  74        *sof = ((struct fcoe_hdr *)skb_network_header(skb))->fcoe_sof;
  75
  76        if (!i40e_fcoe_sof_is_supported(*sof))
  77                return -EINVAL;
  78        return 0;
  79}
  80
  81/**
  82 * i40e_fcoe_eof_is_supported - returns true if the EOF is supported by HW
  83 * @eof:     the input EOF value from the frame
  84 **/
  85static inline bool i40e_fcoe_eof_is_supported(u8 eof)
  86{
  87        return (eof == FC_EOF_N) || (eof == FC_EOF_T) ||
  88               (eof == FC_EOF_NI) || (eof == FC_EOF_A);
  89}
  90
  91/**
  92 * i40e_fcoe_fc_eof - pull EOF from FCoE trailer in the frame
  93 * @skb: the frame whose EOF is to be pulled from
  94 **/
  95static inline int i40e_fcoe_fc_eof(struct sk_buff *skb, u8 *eof)
  96{
  97        /* the first byte of the last dword is EOF */
  98        skb_copy_bits(skb, skb->len - 4, eof, 1);
  99
 100        if (!i40e_fcoe_eof_is_supported(*eof))
 101                return -EINVAL;
 102        return 0;
 103}
 104
 105/**
 106 * i40e_fcoe_ctxt_eof - convert input FC EOF for descriptor programming
 107 * @eof: the input eof value from the frame
 108 *
 109 * The FC EOF is converted to the value understood by HW for descriptor
 110 * programming. Never call this w/o calling i40e_fcoe_eof_is_supported()
 111 * first and that already checks for all supported valid eof values.
 112 **/
 113static inline u32 i40e_fcoe_ctxt_eof(u8 eof)
 114{
 115        switch (eof) {
 116        case FC_EOF_N:
 117                return I40E_TX_DESC_CMD_L4T_EOFT_EOF_N;
 118        case FC_EOF_T:
 119                return I40E_TX_DESC_CMD_L4T_EOFT_EOF_T;
 120        case FC_EOF_NI:
 121                return I40E_TX_DESC_CMD_L4T_EOFT_EOF_NI;
 122        case FC_EOF_A:
 123                return I40E_TX_DESC_CMD_L4T_EOFT_EOF_A;
 124        default:
 125                /* Supported valid eof shall be already checked by
 126                 * calling i40e_fcoe_eof_is_supported() first,
 127                 * therefore this default case shall never hit.
 128                 */
 129                WARN_ON(1);
 130                return -EINVAL;
 131        }
 132}
 133
 134/**
 135 * i40e_fcoe_xid_is_valid - returns true if the exchange id is valid
 136 * @xid: the exchange id
 137 **/
 138static inline bool i40e_fcoe_xid_is_valid(u16 xid)
 139{
 140        return (xid != FC_XID_UNKNOWN) && (xid < I40E_FCOE_DDP_MAX);
 141}
 142
 143/**
 144 * i40e_fcoe_ddp_unmap - unmap the mapped sglist associated
 145 * @pf: pointer to PF
 146 * @ddp: sw DDP context
 147 *
 148 * Unmap the scatter-gather list associated with the given SW DDP context
 149 *
 150 * Returns: data length already ddp-ed in bytes
 151 *
 152 **/
 153static inline void i40e_fcoe_ddp_unmap(struct i40e_pf *pf,
 154                                       struct i40e_fcoe_ddp *ddp)
 155{
 156        if (test_and_set_bit(__I40E_FCOE_DDP_UNMAPPED, &ddp->flags))
 157                return;
 158
 159        if (ddp->sgl) {
 160                dma_unmap_sg(&pf->pdev->dev, ddp->sgl, ddp->sgc,
 161                             DMA_FROM_DEVICE);
 162                ddp->sgl = NULL;
 163                ddp->sgc = 0;
 164        }
 165
 166        if (ddp->pool) {
 167                dma_pool_free(ddp->pool, ddp->udl, ddp->udp);
 168                ddp->pool = NULL;
 169        }
 170}
 171
 172/**
 173 * i40e_fcoe_ddp_clear - clear the given SW DDP context
 174 * @ddp - SW DDP context
 175 **/
 176static inline void i40e_fcoe_ddp_clear(struct i40e_fcoe_ddp *ddp)
 177{
 178        memset(ddp, 0, sizeof(struct i40e_fcoe_ddp));
 179        ddp->xid = FC_XID_UNKNOWN;
 180        ddp->flags = __I40E_FCOE_DDP_NONE;
 181}
 182
 183/**
 184 * i40e_fcoe_progid_is_fcoe - check if the prog_id is for FCoE
 185 * @id: the prog id for the programming status Rx descriptor write-back
 186 **/
 187static inline bool i40e_fcoe_progid_is_fcoe(u8 id)
 188{
 189        return (id == I40E_RX_PROG_STATUS_DESC_FCOE_CTXT_PROG_STATUS) ||
 190               (id == I40E_RX_PROG_STATUS_DESC_FCOE_CTXT_INVL_STATUS);
 191}
 192
 193/**
 194 * i40e_fcoe_fc_get_xid - get xid from the frame header
 195 * @fh: the fc frame header
 196 *
 197 * In case the incoming frame's exchange is originated from
 198 * the initiator, then received frame's exchange id is ANDed
 199 * with fc_cpu_mask bits to get the same cpu on which exchange
 200 * was originated, otherwise just use the current cpu.
 201 *
 202 * Returns ox_id if exchange originator, rx_id if responder
 203 **/
 204static inline u16 i40e_fcoe_fc_get_xid(struct fc_frame_header *fh)
 205{
 206        u32 f_ctl = ntoh24(fh->fh_f_ctl);
 207
 208        return (f_ctl & FC_FC_EX_CTX) ?
 209                be16_to_cpu(fh->fh_ox_id) :
 210                be16_to_cpu(fh->fh_rx_id);
 211}
 212
 213/**
 214 * i40e_fcoe_fc_frame_header - get fc frame header from skb
 215 * @skb: packet
 216 *
 217 * This checks if there is a VLAN header and returns the data
 218 * pointer to the start of the fc_frame_header.
 219 *
 220 * Returns pointer to the fc_frame_header
 221 **/
 222static inline struct fc_frame_header *i40e_fcoe_fc_frame_header(
 223        struct sk_buff *skb)
 224{
 225        void *fh = skb->data + sizeof(struct fcoe_hdr);
 226
 227        if (eth_hdr(skb)->h_proto == htons(ETH_P_8021Q))
 228                fh += sizeof(struct vlan_hdr);
 229
 230        return (struct fc_frame_header *)fh;
 231}
 232
 233/**
 234 * i40e_fcoe_ddp_put - release the DDP context for a given exchange id
 235 * @netdev: the corresponding net_device
 236 * @xid: the exchange id that corresponding DDP context will be released
 237 *
 238 * This is the implementation of net_device_ops.ndo_fcoe_ddp_done
 239 * and it is expected to be called by ULD, i.e., FCP layer of libfc
 240 * to release the corresponding ddp context when the I/O is done.
 241 *
 242 * Returns : data length already ddp-ed in bytes
 243 **/
 244static int i40e_fcoe_ddp_put(struct net_device *netdev, u16 xid)
 245{
 246        struct i40e_netdev_priv *np = netdev_priv(netdev);
 247        struct i40e_pf *pf = np->vsi->back;
 248        struct i40e_fcoe *fcoe = &pf->fcoe;
 249        int len = 0;
 250        struct i40e_fcoe_ddp *ddp = &fcoe->ddp[xid];
 251
 252        if (!fcoe || !ddp)
 253                goto out;
 254
 255        if (test_bit(__I40E_FCOE_DDP_DONE, &ddp->flags))
 256                len = ddp->len;
 257        i40e_fcoe_ddp_unmap(pf, ddp);
 258out:
 259        return len;
 260}
 261
 262/**
 263 * i40e_fcoe_sw_init - sets up the HW for FCoE
 264 * @pf: pointer to PF
 265 **/
 266void i40e_init_pf_fcoe(struct i40e_pf *pf)
 267{
 268        struct i40e_hw *hw = &pf->hw;
 269        u32 val;
 270
 271        pf->flags &= ~I40E_FLAG_FCOE_ENABLED;
 272        pf->num_fcoe_qps = 0;
 273        pf->fcoe_hmc_cntx_num = 0;
 274        pf->fcoe_hmc_filt_num = 0;
 275
 276        if (!pf->hw.func_caps.fcoe) {
 277                dev_dbg(&pf->pdev->dev, "FCoE capability is disabled\n");
 278                return;
 279        }
 280
 281        if (!pf->hw.func_caps.dcb) {
 282                dev_warn(&pf->pdev->dev,
 283                         "Hardware is not DCB capable not enabling FCoE.\n");
 284                return;
 285        }
 286
 287        /* enable FCoE hash filter */
 288        val = i40e_read_rx_ctl(hw, I40E_PFQF_HENA(1));
 289        val |= BIT(I40E_FILTER_PCTYPE_FCOE_OX - 32);
 290        val |= BIT(I40E_FILTER_PCTYPE_FCOE_RX - 32);
 291        val &= I40E_PFQF_HENA_PTYPE_ENA_MASK;
 292        i40e_write_rx_ctl(hw, I40E_PFQF_HENA(1), val);
 293
 294        /* enable flag */
 295        pf->flags |= I40E_FLAG_FCOE_ENABLED;
 296        pf->num_fcoe_qps = I40E_DEFAULT_FCOE;
 297
 298        /* Reserve 4K DDP contexts and 20K filter size for FCoE */
 299        pf->fcoe_hmc_cntx_num = BIT(I40E_DMA_CNTX_SIZE_4K) *
 300                                I40E_DMA_CNTX_BASE_SIZE;
 301        pf->fcoe_hmc_filt_num = pf->fcoe_hmc_cntx_num +
 302                                BIT(I40E_HASH_FILTER_SIZE_16K) *
 303                                I40E_HASH_FILTER_BASE_SIZE;
 304
 305        /* FCoE object: max 16K filter buckets and 4K DMA contexts */
 306        pf->filter_settings.fcoe_filt_num = I40E_HASH_FILTER_SIZE_16K;
 307        pf->filter_settings.fcoe_cntx_num = I40E_DMA_CNTX_SIZE_4K;
 308
 309        /* Setup max frame with FCoE_MTU plus L2 overheads */
 310        val = i40e_read_rx_ctl(hw, I40E_GLFCOE_RCTL);
 311        val &= ~I40E_GLFCOE_RCTL_MAX_SIZE_MASK;
 312        val |= ((FCOE_MTU + ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN)
 313                 << I40E_GLFCOE_RCTL_MAX_SIZE_SHIFT);
 314        i40e_write_rx_ctl(hw, I40E_GLFCOE_RCTL, val);
 315
 316        dev_info(&pf->pdev->dev, "FCoE is supported.\n");
 317}
 318
 319/**
 320 * i40e_get_fcoe_tc_map - Return TC map for FCoE APP
 321 * @pf: pointer to PF
 322 *
 323 **/
 324u8 i40e_get_fcoe_tc_map(struct i40e_pf *pf)
 325{
 326        struct i40e_dcb_app_priority_table app;
 327        struct i40e_hw *hw = &pf->hw;
 328        u8 enabled_tc = 0;
 329        u8 tc, i;
 330        /* Get the FCoE APP TLV */
 331        struct i40e_dcbx_config *dcbcfg = &hw->local_dcbx_config;
 332
 333        for (i = 0; i < dcbcfg->numapps; i++) {
 334                app = dcbcfg->app[i];
 335                if (app.selector == IEEE_8021QAZ_APP_SEL_ETHERTYPE &&
 336                    app.protocolid == ETH_P_FCOE) {
 337                        tc = dcbcfg->etscfg.prioritytable[app.priority];
 338                        enabled_tc |= BIT(tc);
 339                        break;
 340                }
 341        }
 342
 343        /* TC0 if there is no TC defined for FCoE APP TLV */
 344        enabled_tc = enabled_tc ? enabled_tc : 0x1;
 345
 346        return enabled_tc;
 347}
 348
 349/**
 350 * i40e_fcoe_vsi_init - prepares the VSI context for creating a FCoE VSI
 351 * @vsi: pointer to the associated VSI struct
 352 * @ctxt: pointer to the associated VSI context to be passed to HW
 353 *
 354 * Returns 0 on success or < 0 on error
 355 **/
 356int i40e_fcoe_vsi_init(struct i40e_vsi *vsi, struct i40e_vsi_context *ctxt)
 357{
 358        struct i40e_aqc_vsi_properties_data *info = &ctxt->info;
 359        struct i40e_pf *pf = vsi->back;
 360        struct i40e_hw *hw = &pf->hw;
 361        u8 enabled_tc = 0;
 362
 363        if (!(pf->flags & I40E_FLAG_FCOE_ENABLED)) {
 364                dev_err(&pf->pdev->dev,
 365                        "FCoE is not enabled for this device\n");
 366                return -EPERM;
 367        }
 368
 369        /* initialize the hardware for FCoE */
 370        ctxt->pf_num = hw->pf_id;
 371        ctxt->vf_num = 0;
 372        ctxt->uplink_seid = vsi->uplink_seid;
 373        ctxt->connection_type = I40E_AQ_VSI_CONN_TYPE_NORMAL;
 374        ctxt->flags = I40E_AQ_VSI_TYPE_PF;
 375
 376        /* FCoE VSI would need the following sections */
 377        info->valid_sections |= cpu_to_le16(I40E_AQ_VSI_PROP_QUEUE_OPT_VALID);
 378
 379        /* FCoE VSI does not need these sections */
 380        info->valid_sections &= cpu_to_le16(~(I40E_AQ_VSI_PROP_SECURITY_VALID |
 381                                            I40E_AQ_VSI_PROP_VLAN_VALID |
 382                                            I40E_AQ_VSI_PROP_CAS_PV_VALID |
 383                                            I40E_AQ_VSI_PROP_INGRESS_UP_VALID |
 384                                            I40E_AQ_VSI_PROP_EGRESS_UP_VALID));
 385
 386        if (i40e_is_vsi_uplink_mode_veb(vsi)) {
 387                info->valid_sections |=
 388                                cpu_to_le16(I40E_AQ_VSI_PROP_SWITCH_VALID);
 389                info->switch_id =
 390                                cpu_to_le16(I40E_AQ_VSI_SW_ID_FLAG_ALLOW_LB);
 391        }
 392        enabled_tc = i40e_get_fcoe_tc_map(pf);
 393        i40e_vsi_setup_queue_map(vsi, ctxt, enabled_tc, true);
 394
 395        /* set up queue option section: only enable FCoE */
 396        info->queueing_opt_flags = I40E_AQ_VSI_QUE_OPT_FCOE_ENA;
 397
 398        return 0;
 399}
 400
 401/**
 402 * i40e_fcoe_enable - this is the implementation of ndo_fcoe_enable,
 403 * indicating the upper FCoE protocol stack is ready to use FCoE
 404 * offload features.
 405 *
 406 * @netdev: pointer to the netdev that FCoE is created on
 407 *
 408 * Returns 0 on success
 409 *
 410 * in RTNL
 411 *
 412 **/
 413int i40e_fcoe_enable(struct net_device *netdev)
 414{
 415        struct i40e_netdev_priv *np = netdev_priv(netdev);
 416        struct i40e_vsi *vsi = np->vsi;
 417        struct i40e_pf *pf = vsi->back;
 418        struct i40e_fcoe *fcoe = &pf->fcoe;
 419
 420        if (!(pf->flags & I40E_FLAG_FCOE_ENABLED)) {
 421                netdev_err(netdev, "HW does not support FCoE.\n");
 422                return -ENODEV;
 423        }
 424
 425        if (vsi->type != I40E_VSI_FCOE) {
 426                netdev_err(netdev, "interface does not support FCoE.\n");
 427                return -EBUSY;
 428        }
 429
 430        atomic_inc(&fcoe->refcnt);
 431
 432        return 0;
 433}
 434
 435/**
 436 * i40e_fcoe_disable- disables FCoE for upper FCoE protocol stack.
 437 * @dev: pointer to the netdev that FCoE is created on
 438 *
 439 * Returns 0 on success
 440 *
 441 **/
 442int i40e_fcoe_disable(struct net_device *netdev)
 443{
 444        struct i40e_netdev_priv *np = netdev_priv(netdev);
 445        struct i40e_vsi *vsi = np->vsi;
 446        struct i40e_pf *pf = vsi->back;
 447        struct i40e_fcoe *fcoe = &pf->fcoe;
 448
 449        if (!(pf->flags & I40E_FLAG_FCOE_ENABLED)) {
 450                netdev_err(netdev, "device does not support FCoE\n");
 451                return -ENODEV;
 452        }
 453        if (vsi->type != I40E_VSI_FCOE)
 454                return -EBUSY;
 455
 456        if (!atomic_dec_and_test(&fcoe->refcnt))
 457                return -EINVAL;
 458
 459        netdev_info(netdev, "FCoE disabled\n");
 460
 461        return 0;
 462}
 463
 464/**
 465 * i40e_fcoe_dma_pool_free - free the per cpu pool for FCoE DDP
 466 * @fcoe: the FCoE sw object
 467 * @dev: the device that the pool is associated with
 468 * @cpu: the cpu for this pool
 469 *
 470 **/
 471static void i40e_fcoe_dma_pool_free(struct i40e_fcoe *fcoe,
 472                                    struct device *dev,
 473                                    unsigned int cpu)
 474{
 475        struct i40e_fcoe_ddp_pool *ddp_pool;
 476
 477        ddp_pool = per_cpu_ptr(fcoe->ddp_pool, cpu);
 478        if (!ddp_pool->pool) {
 479                dev_warn(dev, "DDP pool already freed for cpu %d\n", cpu);
 480                return;
 481        }
 482        dma_pool_destroy(ddp_pool->pool);
 483        ddp_pool->pool = NULL;
 484}
 485
 486/**
 487 * i40e_fcoe_dma_pool_create - per cpu pool for FCoE DDP
 488 * @fcoe: the FCoE sw object
 489 * @dev: the device that the pool is associated with
 490 * @cpu: the cpu for this pool
 491 *
 492 * Returns 0 on successful or non zero on failure
 493 *
 494 **/
 495static int i40e_fcoe_dma_pool_create(struct i40e_fcoe *fcoe,
 496                                     struct device *dev,
 497                                     unsigned int cpu)
 498{
 499        struct i40e_fcoe_ddp_pool *ddp_pool;
 500        struct dma_pool *pool;
 501        char pool_name[32];
 502
 503        ddp_pool = per_cpu_ptr(fcoe->ddp_pool, cpu);
 504        if (ddp_pool && ddp_pool->pool) {
 505                dev_warn(dev, "DDP pool already allocated for cpu %d\n", cpu);
 506                return 0;
 507        }
 508        snprintf(pool_name, sizeof(pool_name), "i40e_fcoe_ddp_%d", cpu);
 509        pool = dma_pool_create(pool_name, dev, I40E_FCOE_DDP_PTR_MAX,
 510                               I40E_FCOE_DDP_PTR_ALIGN, PAGE_SIZE);
 511        if (!pool) {
 512                dev_err(dev, "dma_pool_create %s failed\n", pool_name);
 513                return -ENOMEM;
 514        }
 515        ddp_pool->pool = pool;
 516        return 0;
 517}
 518
 519/**
 520 * i40e_fcoe_free_ddp_resources - release FCoE DDP resources
 521 * @vsi: the vsi FCoE is associated with
 522 *
 523 **/
 524void i40e_fcoe_free_ddp_resources(struct i40e_vsi *vsi)
 525{
 526        struct i40e_pf *pf = vsi->back;
 527        struct i40e_fcoe *fcoe = &pf->fcoe;
 528        int cpu, i;
 529
 530        /* do nothing if not FCoE VSI */
 531        if (vsi->type != I40E_VSI_FCOE)
 532                return;
 533
 534        /* do nothing if no DDP pools were allocated */
 535        if (!fcoe->ddp_pool)
 536                return;
 537
 538        for (i = 0; i < I40E_FCOE_DDP_MAX; i++)
 539                i40e_fcoe_ddp_put(vsi->netdev, i);
 540
 541        for_each_possible_cpu(cpu)
 542                i40e_fcoe_dma_pool_free(fcoe, &pf->pdev->dev, cpu);
 543
 544        free_percpu(fcoe->ddp_pool);
 545        fcoe->ddp_pool = NULL;
 546
 547        netdev_info(vsi->netdev, "VSI %d,%d FCoE DDP resources released\n",
 548                    vsi->id, vsi->seid);
 549}
 550
 551/**
 552 * i40e_fcoe_setup_ddp_resources - allocate per cpu DDP resources
 553 * @vsi: the VSI FCoE is associated with
 554 *
 555 * Returns 0 on successful or non zero on failure
 556 *
 557 **/
 558int i40e_fcoe_setup_ddp_resources(struct i40e_vsi *vsi)
 559{
 560        struct i40e_pf *pf = vsi->back;
 561        struct device *dev = &pf->pdev->dev;
 562        struct i40e_fcoe *fcoe = &pf->fcoe;
 563        unsigned int cpu;
 564        int i;
 565
 566        if (vsi->type != I40E_VSI_FCOE)
 567                return -ENODEV;
 568
 569        /* do nothing if no DDP pools were allocated */
 570        if (fcoe->ddp_pool)
 571                return -EEXIST;
 572
 573        /* allocate per CPU memory to track DDP pools */
 574        fcoe->ddp_pool = alloc_percpu(struct i40e_fcoe_ddp_pool);
 575        if (!fcoe->ddp_pool) {
 576                dev_err(&pf->pdev->dev, "failed to allocate percpu DDP\n");
 577                return -ENOMEM;
 578        }
 579
 580        /* allocate pci pool for each cpu */
 581        for_each_possible_cpu(cpu) {
 582                if (!i40e_fcoe_dma_pool_create(fcoe, dev, cpu))
 583                        continue;
 584
 585                dev_err(dev, "failed to alloc DDP pool on cpu:%d\n", cpu);
 586                i40e_fcoe_free_ddp_resources(vsi);
 587                return -ENOMEM;
 588        }
 589
 590        /* initialize the sw context */
 591        for (i = 0; i < I40E_FCOE_DDP_MAX; i++)
 592                i40e_fcoe_ddp_clear(&fcoe->ddp[i]);
 593
 594        netdev_info(vsi->netdev, "VSI %d,%d FCoE DDP resources allocated\n",
 595                    vsi->id, vsi->seid);
 596
 597        return 0;
 598}
 599
 600/**
 601 * i40e_fcoe_handle_status - check the Programming Status for FCoE
 602 * @rx_ring: the Rx ring for this descriptor
 603 * @rx_desc: the Rx descriptor for Programming Status, not a packet descriptor.
 604 *
 605 * Check if this is the Rx Programming Status descriptor write-back for FCoE.
 606 * This is used to verify if the context/filter programming or invalidation
 607 * requested by SW to the HW is successful or not and take actions accordingly.
 608 **/
 609void i40e_fcoe_handle_status(struct i40e_ring *rx_ring,
 610                             union i40e_rx_desc *rx_desc, u8 prog_id)
 611{
 612        struct i40e_pf *pf = rx_ring->vsi->back;
 613        struct i40e_fcoe *fcoe = &pf->fcoe;
 614        struct i40e_fcoe_ddp *ddp;
 615        u32 error;
 616        u16 xid;
 617        u64 qw;
 618
 619        /* we only care for FCoE here */
 620        if (!i40e_fcoe_progid_is_fcoe(prog_id))
 621                return;
 622
 623        xid = le32_to_cpu(rx_desc->wb.qword0.hi_dword.fcoe_param) &
 624              (I40E_FCOE_DDP_MAX - 1);
 625
 626        if (!i40e_fcoe_xid_is_valid(xid))
 627                return;
 628
 629        ddp = &fcoe->ddp[xid];
 630        WARN_ON(xid != ddp->xid);
 631
 632        qw = le64_to_cpu(rx_desc->wb.qword1.status_error_len);
 633        error = (qw & I40E_RX_PROG_STATUS_DESC_QW1_ERROR_MASK) >>
 634                I40E_RX_PROG_STATUS_DESC_QW1_ERROR_SHIFT;
 635
 636        /* DDP context programming status: failure or success */
 637        if (prog_id == I40E_RX_PROG_STATUS_DESC_FCOE_CTXT_PROG_STATUS) {
 638                if (I40E_RX_PROG_FCOE_ERROR_TBL_FULL(error)) {
 639                        dev_err(&pf->pdev->dev, "xid %x ddp->xid %x TABLE FULL\n",
 640                                xid, ddp->xid);
 641                        ddp->prerr |= I40E_RX_PROG_FCOE_ERROR_TBL_FULL_BIT;
 642                }
 643                if (I40E_RX_PROG_FCOE_ERROR_CONFLICT(error)) {
 644                        dev_err(&pf->pdev->dev, "xid %x ddp->xid %x CONFLICT\n",
 645                                xid, ddp->xid);
 646                        ddp->prerr |= I40E_RX_PROG_FCOE_ERROR_CONFLICT_BIT;
 647                }
 648        }
 649
 650        /* DDP context invalidation status: failure or success */
 651        if (prog_id == I40E_RX_PROG_STATUS_DESC_FCOE_CTXT_INVL_STATUS) {
 652                if (I40E_RX_PROG_FCOE_ERROR_INVLFAIL(error)) {
 653                        dev_err(&pf->pdev->dev, "xid %x ddp->xid %x INVALIDATION FAILURE\n",
 654                                xid, ddp->xid);
 655                        ddp->prerr |= I40E_RX_PROG_FCOE_ERROR_INVLFAIL_BIT;
 656                }
 657                /* clear the flag so we can retry invalidation */
 658                clear_bit(__I40E_FCOE_DDP_ABORTED, &ddp->flags);
 659        }
 660
 661        /* unmap DMA */
 662        i40e_fcoe_ddp_unmap(pf, ddp);
 663        i40e_fcoe_ddp_clear(ddp);
 664}
 665
 666/**
 667 * i40e_fcoe_handle_offload - check ddp status and mark it done
 668 * @adapter: i40e adapter
 669 * @rx_desc: advanced rx descriptor
 670 * @skb: the skb holding the received data
 671 *
 672 * This checks ddp status.
 673 *
 674 * Returns : < 0 indicates an error or not a FCOE ddp, 0 indicates
 675 * not passing the skb to ULD, > 0 indicates is the length of data
 676 * being ddped.
 677 *
 678 **/
 679int i40e_fcoe_handle_offload(struct i40e_ring *rx_ring,
 680                             union i40e_rx_desc *rx_desc,
 681                             struct sk_buff *skb)
 682{
 683        struct i40e_pf *pf = rx_ring->vsi->back;
 684        struct i40e_fcoe *fcoe = &pf->fcoe;
 685        struct fc_frame_header *fh = NULL;
 686        struct i40e_fcoe_ddp *ddp = NULL;
 687        u32 status, fltstat;
 688        u32 error, fcerr;
 689        int rc = -EINVAL;
 690        u16 ptype;
 691        u16 xid;
 692        u64 qw;
 693
 694        /* check this rxd is for programming status */
 695        qw = le64_to_cpu(rx_desc->wb.qword1.status_error_len);
 696        /* packet descriptor, check packet type */
 697        ptype = (qw & I40E_RXD_QW1_PTYPE_MASK) >> I40E_RXD_QW1_PTYPE_SHIFT;
 698        if (!i40e_rx_is_fcoe(ptype))
 699                goto out_no_ddp;
 700
 701        error = (qw & I40E_RXD_QW1_ERROR_MASK) >> I40E_RXD_QW1_ERROR_SHIFT;
 702        fcerr = (error >> I40E_RX_DESC_ERROR_L3L4E_SHIFT) &
 703                 I40E_RX_DESC_FCOE_ERROR_MASK;
 704
 705        /* check stateless offload error */
 706        if (unlikely(fcerr == I40E_RX_DESC_ERROR_L3L4E_PROT)) {
 707                dev_err(&pf->pdev->dev, "Protocol Error\n");
 708                skb->ip_summed = CHECKSUM_NONE;
 709        } else {
 710                skb->ip_summed = CHECKSUM_UNNECESSARY;
 711        }
 712
 713        /* check hw status on ddp */
 714        status = (qw & I40E_RXD_QW1_STATUS_MASK) >> I40E_RXD_QW1_STATUS_SHIFT;
 715        fltstat = (status >> I40E_RX_DESC_STATUS_FLTSTAT_SHIFT) &
 716                   I40E_RX_DESC_FLTSTAT_FCMASK;
 717
 718        /* now we are ready to check DDP */
 719        fh = i40e_fcoe_fc_frame_header(skb);
 720        xid = i40e_fcoe_fc_get_xid(fh);
 721        if (!i40e_fcoe_xid_is_valid(xid))
 722                goto out_no_ddp;
 723
 724        /* non DDP normal receive, return to the protocol stack */
 725        if (fltstat == I40E_RX_DESC_FLTSTAT_NOMTCH)
 726                goto out_no_ddp;
 727
 728        /* do we have a sw ddp context setup ? */
 729        ddp = &fcoe->ddp[xid];
 730        if (!ddp->sgl)
 731                goto out_no_ddp;
 732
 733        /* fetch xid from hw rxd wb, which should match up the sw ctxt */
 734        xid = le16_to_cpu(rx_desc->wb.qword0.lo_dword.mirr_fcoe.fcoe_ctx_id);
 735        if (ddp->xid != xid) {
 736                dev_err(&pf->pdev->dev, "xid 0x%x does not match ctx_xid 0x%x\n",
 737                        ddp->xid, xid);
 738                goto out_put_ddp;
 739        }
 740
 741        /* the same exchange has already errored out */
 742        if (ddp->fcerr) {
 743                dev_err(&pf->pdev->dev, "xid 0x%x fcerr 0x%x reported fcer 0x%x\n",
 744                        xid, ddp->fcerr, fcerr);
 745                goto out_put_ddp;
 746        }
 747
 748        /* fcoe param is valid by now with correct DDPed length */
 749        ddp->len = le32_to_cpu(rx_desc->wb.qword0.hi_dword.fcoe_param);
 750        ddp->fcerr = fcerr;
 751        /* header posting only, useful only for target mode and debugging */
 752        if (fltstat == I40E_RX_DESC_FLTSTAT_DDP) {
 753                /* For target mode, we get header of the last packet but it
 754                 * does not have the FCoE trailer field, i.e., CRC and EOF
 755                 * Ordered Set since they are offloaded by the HW, so fill
 756                 * it up correspondingly to allow the packet to pass through
 757                 * to the upper protocol stack.
 758                 */
 759                u32 f_ctl = ntoh24(fh->fh_f_ctl);
 760
 761                if ((f_ctl & FC_FC_END_SEQ) &&
 762                    (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA)) {
 763                        struct fcoe_crc_eof *crc = NULL;
 764
 765                        crc = (struct fcoe_crc_eof *)skb_put(skb, sizeof(*crc));
 766                        crc->fcoe_eof = FC_EOF_T;
 767                } else {
 768                        /* otherwise, drop the header only frame */
 769                        rc = 0;
 770                        goto out_no_ddp;
 771                }
 772        }
 773
 774out_put_ddp:
 775        /* either we got RSP or we have an error, unmap DMA in both cases */
 776        i40e_fcoe_ddp_unmap(pf, ddp);
 777        if (ddp->len && !ddp->fcerr) {
 778                int pkts;
 779
 780                rc = ddp->len;
 781                i40e_fcoe_ddp_clear(ddp);
 782                ddp->len = rc;
 783                pkts = DIV_ROUND_UP(rc, 2048);
 784                rx_ring->stats.bytes += rc;
 785                rx_ring->stats.packets += pkts;
 786                rx_ring->q_vector->rx.total_bytes += rc;
 787                rx_ring->q_vector->rx.total_packets += pkts;
 788                set_bit(__I40E_FCOE_DDP_DONE, &ddp->flags);
 789        }
 790
 791out_no_ddp:
 792        return rc;
 793}
 794
 795/**
 796 * i40e_fcoe_ddp_setup - called to set up ddp context
 797 * @netdev: the corresponding net_device
 798 * @xid: the exchange id requesting ddp
 799 * @sgl: the scatter-gather list for this request
 800 * @sgc: the number of scatter-gather items
 801 * @target_mode: indicates this is a DDP request for target
 802 *
 803 * Returns : 1 for success and 0 for no DDP on this I/O
 804 **/
 805static int i40e_fcoe_ddp_setup(struct net_device *netdev, u16 xid,
 806                               struct scatterlist *sgl, unsigned int sgc,
 807                               int target_mode)
 808{
 809        static const unsigned int bufflen = I40E_FCOE_DDP_BUF_MIN;
 810        struct i40e_netdev_priv *np = netdev_priv(netdev);
 811        struct i40e_fcoe_ddp_pool *ddp_pool;
 812        struct i40e_pf *pf = np->vsi->back;
 813        struct i40e_fcoe *fcoe = &pf->fcoe;
 814        unsigned int i, j, dmacount;
 815        struct i40e_fcoe_ddp *ddp;
 816        unsigned int firstoff = 0;
 817        unsigned int thisoff = 0;
 818        unsigned int thislen = 0;
 819        struct scatterlist *sg;
 820        dma_addr_t addr = 0;
 821        unsigned int len;
 822
 823        if (xid >= I40E_FCOE_DDP_MAX) {
 824                dev_warn(&pf->pdev->dev, "xid=0x%x out-of-range\n", xid);
 825                return 0;
 826        }
 827
 828        /* no DDP if we are already down or resetting */
 829        if (test_bit(__I40E_DOWN, &pf->state) ||
 830            test_bit(__I40E_NEEDS_RESTART, &pf->state)) {
 831                dev_info(&pf->pdev->dev, "xid=0x%x device in reset/down\n",
 832                         xid);
 833                return 0;
 834        }
 835
 836        ddp = &fcoe->ddp[xid];
 837        if (ddp->sgl) {
 838                dev_info(&pf->pdev->dev, "xid 0x%x w/ non-null sgl=%p nents=%d\n",
 839                         xid, ddp->sgl, ddp->sgc);
 840                return 0;
 841        }
 842        i40e_fcoe_ddp_clear(ddp);
 843
 844        if (!fcoe->ddp_pool) {
 845                dev_info(&pf->pdev->dev, "No DDP pool, xid 0x%x\n", xid);
 846                return 0;
 847        }
 848
 849        ddp_pool = per_cpu_ptr(fcoe->ddp_pool, get_cpu());
 850        if (!ddp_pool->pool) {
 851                dev_info(&pf->pdev->dev, "No percpu ddp pool, xid 0x%x\n", xid);
 852                goto out_noddp;
 853        }
 854
 855        /* setup dma from scsi command sgl */
 856        dmacount = dma_map_sg(&pf->pdev->dev, sgl, sgc, DMA_FROM_DEVICE);
 857        if (dmacount == 0) {
 858                dev_info(&pf->pdev->dev, "dma_map_sg for sgl %p, sgc %d failed\n",
 859                         sgl, sgc);
 860                goto out_noddp_unmap;
 861        }
 862
 863        /* alloc the udl from our ddp pool */
 864        ddp->udl = dma_pool_alloc(ddp_pool->pool, GFP_ATOMIC, &ddp->udp);
 865        if (!ddp->udl) {
 866                dev_info(&pf->pdev->dev,
 867                         "Failed allocated ddp context, xid 0x%x\n", xid);
 868                goto out_noddp_unmap;
 869        }
 870
 871        j = 0;
 872        ddp->len = 0;
 873        for_each_sg(sgl, sg, dmacount, i) {
 874                addr = sg_dma_address(sg);
 875                len = sg_dma_len(sg);
 876                ddp->len += len;
 877                while (len) {
 878                        /* max number of buffers allowed in one DDP context */
 879                        if (j >= I40E_FCOE_DDP_BUFFCNT_MAX) {
 880                                dev_info(&pf->pdev->dev,
 881                                         "xid=%x:%d,%d,%d:addr=%llx not enough descriptors\n",
 882                                         xid, i, j, dmacount, (u64)addr);
 883                                goto out_noddp_free;
 884                        }
 885
 886                        /* get the offset of length of current buffer */
 887                        thisoff = addr & ((dma_addr_t)bufflen - 1);
 888                        thislen = min_t(unsigned int, (bufflen - thisoff), len);
 889                        /* all but the 1st buffer (j == 0)
 890                         * must be aligned on bufflen
 891                         */
 892                        if ((j != 0) && (thisoff))
 893                                goto out_noddp_free;
 894
 895                        /* all but the last buffer
 896                         * ((i == (dmacount - 1)) && (thislen == len))
 897                         * must end at bufflen
 898                         */
 899                        if (((i != (dmacount - 1)) || (thislen != len)) &&
 900                            ((thislen + thisoff) != bufflen))
 901                                goto out_noddp_free;
 902
 903                        ddp->udl[j] = (u64)(addr - thisoff);
 904                        /* only the first buffer may have none-zero offset */
 905                        if (j == 0)
 906                                firstoff = thisoff;
 907                        len -= thislen;
 908                        addr += thislen;
 909                        j++;
 910                }
 911        }
 912        /* only the last buffer may have non-full bufflen */
 913        ddp->lastsize = thisoff + thislen;
 914        ddp->firstoff = firstoff;
 915        ddp->list_len = j;
 916        ddp->pool = ddp_pool->pool;
 917        ddp->sgl = sgl;
 918        ddp->sgc = sgc;
 919        ddp->xid = xid;
 920        if (target_mode)
 921                set_bit(__I40E_FCOE_DDP_TARGET, &ddp->flags);
 922        set_bit(__I40E_FCOE_DDP_INITALIZED, &ddp->flags);
 923
 924        put_cpu();
 925        return 1; /* Success */
 926
 927out_noddp_free:
 928        dma_pool_free(ddp->pool, ddp->udl, ddp->udp);
 929        i40e_fcoe_ddp_clear(ddp);
 930
 931out_noddp_unmap:
 932        dma_unmap_sg(&pf->pdev->dev, sgl, sgc, DMA_FROM_DEVICE);
 933out_noddp:
 934        put_cpu();
 935        return 0;
 936}
 937
 938/**
 939 * i40e_fcoe_ddp_get - called to set up ddp context in initiator mode
 940 * @netdev: the corresponding net_device
 941 * @xid: the exchange id requesting ddp
 942 * @sgl: the scatter-gather list for this request
 943 * @sgc: the number of scatter-gather items
 944 *
 945 * This is the implementation of net_device_ops.ndo_fcoe_ddp_setup
 946 * and is expected to be called from ULD, e.g., FCP layer of libfc
 947 * to set up ddp for the corresponding xid of the given sglist for
 948 * the corresponding I/O.
 949 *
 950 * Returns : 1 for success and 0 for no ddp
 951 **/
 952static int i40e_fcoe_ddp_get(struct net_device *netdev, u16 xid,
 953                             struct scatterlist *sgl, unsigned int sgc)
 954{
 955        return i40e_fcoe_ddp_setup(netdev, xid, sgl, sgc, 0);
 956}
 957
 958/**
 959 * i40e_fcoe_ddp_target - called to set up ddp context in target mode
 960 * @netdev: the corresponding net_device
 961 * @xid: the exchange id requesting ddp
 962 * @sgl: the scatter-gather list for this request
 963 * @sgc: the number of scatter-gather items
 964 *
 965 * This is the implementation of net_device_ops.ndo_fcoe_ddp_target
 966 * and is expected to be called from ULD, e.g., FCP layer of libfc
 967 * to set up ddp for the corresponding xid of the given sglist for
 968 * the corresponding I/O. The DDP in target mode is a write I/O request
 969 * from the initiator.
 970 *
 971 * Returns : 1 for success and 0 for no ddp
 972 **/
 973static int i40e_fcoe_ddp_target(struct net_device *netdev, u16 xid,
 974                                struct scatterlist *sgl, unsigned int sgc)
 975{
 976        return i40e_fcoe_ddp_setup(netdev, xid, sgl, sgc, 1);
 977}
 978
 979/**
 980 * i40e_fcoe_program_ddp - programs the HW DDP related descriptors
 981 * @tx_ring: transmit ring for this packet
 982 * @skb:     the packet to be sent out
 983 * @sof: the SOF to indicate class of service
 984 *
 985 * Determine if it is READ/WRITE command, and finds out if there is
 986 * a matching SW DDP context for this command. DDP is applicable
 987 * only in case of READ if initiator or WRITE in case of
 988 * responder (via checking XFER_RDY).
 989 *
 990 * Note: caller checks sof and ddp sw context
 991 *
 992 * Returns : none
 993 *
 994 **/
 995static void i40e_fcoe_program_ddp(struct i40e_ring *tx_ring,
 996                                  struct sk_buff *skb,
 997                                  struct i40e_fcoe_ddp *ddp, u8 sof)
 998{
 999        struct i40e_fcoe_filter_context_desc *filter_desc = NULL;
1000        struct i40e_fcoe_queue_context_desc *queue_desc = NULL;
1001        struct i40e_fcoe_ddp_context_desc *ddp_desc = NULL;
1002        struct i40e_pf *pf = tx_ring->vsi->back;
1003        u16 i = tx_ring->next_to_use;
1004        struct fc_frame_header *fh;
1005        u64 flags_rsvd_lanq = 0;
1006        bool target_mode;
1007
1008        /* check if abort is still pending */
1009        if (test_bit(__I40E_FCOE_DDP_ABORTED, &ddp->flags)) {
1010                dev_warn(&pf->pdev->dev,
1011                         "DDP abort is still pending xid:%hx and ddp->flags:%lx:\n",
1012                         ddp->xid, ddp->flags);
1013                return;
1014        }
1015
1016        /* set the flag to indicate this is programmed */
1017        if (test_and_set_bit(__I40E_FCOE_DDP_PROGRAMMED, &ddp->flags)) {
1018                dev_warn(&pf->pdev->dev,
1019                         "DDP is already programmed for xid:%hx and ddp->flags:%lx:\n",
1020                         ddp->xid, ddp->flags);
1021                return;
1022        }
1023
1024        /* Prepare the DDP context descriptor */
1025        ddp_desc = I40E_DDP_CONTEXT_DESC(tx_ring, i);
1026        i++;
1027        if (i == tx_ring->count)
1028                i = 0;
1029
1030        ddp_desc->type_cmd_foff_lsize =
1031                                cpu_to_le64(I40E_TX_DESC_DTYPE_DDP_CTX  |
1032                                ((u64)I40E_FCOE_DDP_CTX_DESC_BSIZE_4K  <<
1033                                I40E_FCOE_DDP_CTX_QW1_CMD_SHIFT)        |
1034                                ((u64)ddp->firstoff                    <<
1035                                I40E_FCOE_DDP_CTX_QW1_FOFF_SHIFT)       |
1036                                ((u64)ddp->lastsize                    <<
1037                                I40E_FCOE_DDP_CTX_QW1_LSIZE_SHIFT));
1038        ddp_desc->rsvd = cpu_to_le64(0);
1039
1040        /* target mode needs last packet in the sequence  */
1041        target_mode = test_bit(__I40E_FCOE_DDP_TARGET, &ddp->flags);
1042        if (target_mode)
1043                ddp_desc->type_cmd_foff_lsize |=
1044                        cpu_to_le64(I40E_FCOE_DDP_CTX_DESC_LASTSEQH);
1045
1046        /* Prepare queue_context descriptor */
1047        queue_desc = I40E_QUEUE_CONTEXT_DESC(tx_ring, i++);
1048        if (i == tx_ring->count)
1049                i = 0;
1050        queue_desc->dmaindx_fbase = cpu_to_le64(ddp->xid | ((u64)ddp->udp));
1051        queue_desc->flen_tph = cpu_to_le64(ddp->list_len |
1052                                ((u64)(I40E_FCOE_QUEUE_CTX_DESC_TPHRDESC |
1053                                I40E_FCOE_QUEUE_CTX_DESC_TPHDATA) <<
1054                                I40E_FCOE_QUEUE_CTX_QW1_TPH_SHIFT));
1055
1056        /* Prepare filter_context_desc */
1057        filter_desc = I40E_FILTER_CONTEXT_DESC(tx_ring, i);
1058        i++;
1059        if (i == tx_ring->count)
1060                i = 0;
1061
1062        fh = (struct fc_frame_header *)skb_transport_header(skb);
1063        filter_desc->param = cpu_to_le32(ntohl(fh->fh_parm_offset));
1064        filter_desc->seqn = cpu_to_le16(ntohs(fh->fh_seq_cnt));
1065        filter_desc->rsvd_dmaindx = cpu_to_le16(ddp->xid <<
1066                                I40E_FCOE_FILTER_CTX_QW0_DMAINDX_SHIFT);
1067
1068        flags_rsvd_lanq = I40E_FCOE_FILTER_CTX_DESC_CTYP_DDP;
1069        flags_rsvd_lanq |= (u64)(target_mode ?
1070                        I40E_FCOE_FILTER_CTX_DESC_ENODE_RSP :
1071                        I40E_FCOE_FILTER_CTX_DESC_ENODE_INIT);
1072
1073        flags_rsvd_lanq |= (u64)((sof == FC_SOF_I2 || sof == FC_SOF_N2) ?
1074                        I40E_FCOE_FILTER_CTX_DESC_FC_CLASS2 :
1075                        I40E_FCOE_FILTER_CTX_DESC_FC_CLASS3);
1076
1077        flags_rsvd_lanq |= ((u64)skb->queue_mapping <<
1078                                I40E_FCOE_FILTER_CTX_QW1_LANQINDX_SHIFT);
1079        filter_desc->flags_rsvd_lanq = cpu_to_le64(flags_rsvd_lanq);
1080
1081        /* By this time, all offload related descriptors has been programmed */
1082        tx_ring->next_to_use = i;
1083}
1084
1085/**
1086 * i40e_fcoe_invalidate_ddp - invalidates DDP in case of abort
1087 * @tx_ring: transmit ring for this packet
1088 * @skb: the packet associated w/ this DDP invalidation, i.e., ABTS
1089 * @ddp: the SW DDP context for this DDP
1090 *
1091 * Programs the Tx context descriptor to do DDP invalidation.
1092 **/
1093static void i40e_fcoe_invalidate_ddp(struct i40e_ring *tx_ring,
1094                                     struct sk_buff *skb,
1095                                     struct i40e_fcoe_ddp *ddp)
1096{
1097        struct i40e_tx_context_desc *context_desc;
1098        int i;
1099
1100        if (test_and_set_bit(__I40E_FCOE_DDP_ABORTED, &ddp->flags))
1101                return;
1102
1103        i = tx_ring->next_to_use;
1104        context_desc = I40E_TX_CTXTDESC(tx_ring, i);
1105        i++;
1106        if (i == tx_ring->count)
1107                i = 0;
1108
1109        context_desc->tunneling_params = cpu_to_le32(0);
1110        context_desc->l2tag2 = cpu_to_le16(0);
1111        context_desc->rsvd = cpu_to_le16(0);
1112        context_desc->type_cmd_tso_mss = cpu_to_le64(
1113                I40E_TX_DESC_DTYPE_FCOE_CTX |
1114                (I40E_FCOE_TX_CTX_DESC_OPCODE_DDP_CTX_INVL <<
1115                I40E_TXD_CTX_QW1_CMD_SHIFT) |
1116                (I40E_FCOE_TX_CTX_DESC_OPCODE_SINGLE_SEND <<
1117                I40E_TXD_CTX_QW1_CMD_SHIFT));
1118        tx_ring->next_to_use = i;
1119}
1120
1121/**
1122 * i40e_fcoe_handle_ddp - check we should setup or invalidate DDP
1123 * @tx_ring: transmit ring for this packet
1124 * @skb: the packet to be sent out
1125 * @sof: the SOF to indicate class of service
1126 *
1127 * Determine if it is ABTS/READ/XFER_RDY, and finds out if there is
1128 * a matching SW DDP context for this command. DDP is applicable
1129 * only in case of READ if initiator or WRITE in case of
1130 * responder (via checking XFER_RDY). In case this is an ABTS, send
1131 * just invalidate the context.
1132 **/
1133static void i40e_fcoe_handle_ddp(struct i40e_ring *tx_ring,
1134                                 struct sk_buff *skb, u8 sof)
1135{
1136        struct i40e_pf *pf = tx_ring->vsi->back;
1137        struct i40e_fcoe *fcoe = &pf->fcoe;
1138        struct fc_frame_header *fh;
1139        struct i40e_fcoe_ddp *ddp;
1140        u32 f_ctl;
1141        u8 r_ctl;
1142        u16 xid;
1143
1144        fh = (struct fc_frame_header *)skb_transport_header(skb);
1145        f_ctl = ntoh24(fh->fh_f_ctl);
1146        r_ctl = fh->fh_r_ctl;
1147        ddp = NULL;
1148
1149        if ((r_ctl == FC_RCTL_DD_DATA_DESC) && (f_ctl & FC_FC_EX_CTX)) {
1150                /* exchange responder? if so, XFER_RDY for write */
1151                xid = ntohs(fh->fh_rx_id);
1152                if (i40e_fcoe_xid_is_valid(xid)) {
1153                        ddp = &fcoe->ddp[xid];
1154                        if ((ddp->xid == xid) &&
1155                            (test_bit(__I40E_FCOE_DDP_TARGET, &ddp->flags)))
1156                                i40e_fcoe_program_ddp(tx_ring, skb, ddp, sof);
1157                }
1158        } else if (r_ctl == FC_RCTL_DD_UNSOL_CMD) {
1159                /* exchange originator, check READ cmd */
1160                xid = ntohs(fh->fh_ox_id);
1161                if (i40e_fcoe_xid_is_valid(xid)) {
1162                        ddp = &fcoe->ddp[xid];
1163                        if ((ddp->xid == xid) &&
1164                            (!test_bit(__I40E_FCOE_DDP_TARGET, &ddp->flags)))
1165                                i40e_fcoe_program_ddp(tx_ring, skb, ddp, sof);
1166                }
1167        } else if (r_ctl == FC_RCTL_BA_ABTS) {
1168                /* exchange originator, check ABTS */
1169                xid = ntohs(fh->fh_ox_id);
1170                if (i40e_fcoe_xid_is_valid(xid)) {
1171                        ddp = &fcoe->ddp[xid];
1172                        if ((ddp->xid == xid) &&
1173                            (!test_bit(__I40E_FCOE_DDP_TARGET, &ddp->flags)))
1174                                i40e_fcoe_invalidate_ddp(tx_ring, skb, ddp);
1175                }
1176        }
1177}
1178
1179/**
1180 * i40e_fcoe_tso - set up FCoE TSO
1181 * @tx_ring:  ring to send buffer on
1182 * @skb:      send buffer
1183 * @tx_flags: collected send information
1184 * @hdr_len:  the tso header length
1185 * @sof: the SOF to indicate class of service
1186 *
1187 * Note must already have sof checked to be either class 2 or class 3 before
1188 * calling this function.
1189 *
1190 * Returns 1 to indicate sequence segmentation offload is properly setup
1191 * or returns 0 to indicate no tso is needed, otherwise returns error
1192 * code to drop the frame.
1193 **/
1194static int i40e_fcoe_tso(struct i40e_ring *tx_ring,
1195                         struct sk_buff *skb,
1196                         u32 tx_flags, u8 *hdr_len, u8 sof)
1197{
1198        struct i40e_tx_context_desc *context_desc;
1199        u32 cd_type, cd_cmd, cd_tso_len, cd_mss;
1200        struct fc_frame_header *fh;
1201        u64 cd_type_cmd_tso_mss;
1202
1203        /* must match gso type as FCoE */
1204        if (!skb_is_gso(skb))
1205                return 0;
1206
1207        /* is it the expected gso type for FCoE ?*/
1208        if (skb_shinfo(skb)->gso_type != SKB_GSO_FCOE) {
1209                netdev_err(skb->dev,
1210                           "wrong gso type %d:expecting SKB_GSO_FCOE\n",
1211                           skb_shinfo(skb)->gso_type);
1212                return -EINVAL;
1213        }
1214
1215        /* header and trailer are inserted by hw */
1216        *hdr_len = skb_transport_offset(skb) + sizeof(struct fc_frame_header) +
1217                   sizeof(struct fcoe_crc_eof);
1218
1219        /* check sof to decide a class 2 or 3 TSO */
1220        if (likely(i40e_fcoe_sof_is_class3(sof)))
1221                cd_cmd = I40E_FCOE_TX_CTX_DESC_OPCODE_TSO_FC_CLASS3;
1222        else
1223                cd_cmd = I40E_FCOE_TX_CTX_DESC_OPCODE_TSO_FC_CLASS2;
1224
1225        /* param field valid? */
1226        fh = (struct fc_frame_header *)skb_transport_header(skb);
1227        if (fh->fh_f_ctl[2] & FC_FC_REL_OFF)
1228                cd_cmd |= I40E_FCOE_TX_CTX_DESC_RELOFF;
1229
1230        /* fill the field values */
1231        cd_type = I40E_TX_DESC_DTYPE_FCOE_CTX;
1232        cd_tso_len = skb->len - *hdr_len;
1233        cd_mss = skb_shinfo(skb)->gso_size;
1234        cd_type_cmd_tso_mss =
1235                ((u64)cd_type  << I40E_TXD_CTX_QW1_DTYPE_SHIFT)     |
1236                ((u64)cd_cmd     << I40E_TXD_CTX_QW1_CMD_SHIFT)     |
1237                ((u64)cd_tso_len << I40E_TXD_CTX_QW1_TSO_LEN_SHIFT) |
1238                ((u64)cd_mss     << I40E_TXD_CTX_QW1_MSS_SHIFT);
1239
1240        /* grab the next descriptor */
1241        context_desc = I40E_TX_CTXTDESC(tx_ring, tx_ring->next_to_use);
1242        tx_ring->next_to_use++;
1243        if (tx_ring->next_to_use == tx_ring->count)
1244                tx_ring->next_to_use = 0;
1245
1246        context_desc->tunneling_params = 0;
1247        context_desc->l2tag2 = cpu_to_le16((tx_flags & I40E_TX_FLAGS_VLAN_MASK)
1248                                            >> I40E_TX_FLAGS_VLAN_SHIFT);
1249        context_desc->type_cmd_tso_mss = cpu_to_le64(cd_type_cmd_tso_mss);
1250
1251        return 1;
1252}
1253
1254/**
1255 * i40e_fcoe_tx_map - build the tx descriptor
1256 * @tx_ring:  ring to send buffer on
1257 * @skb:      send buffer
1258 * @first:    first buffer info buffer to use
1259 * @tx_flags: collected send information
1260 * @hdr_len:  ptr to the size of the packet header
1261 * @eof:      the frame eof value
1262 *
1263 * Note, for FCoE, sof and eof are already checked
1264 **/
1265static void i40e_fcoe_tx_map(struct i40e_ring *tx_ring,
1266                             struct sk_buff *skb,
1267                             struct i40e_tx_buffer *first,
1268                             u32 tx_flags, u8 hdr_len, u8 eof)
1269{
1270        u32 td_offset = 0;
1271        u32 td_cmd = 0;
1272        u32 maclen;
1273
1274        /* insert CRC */
1275        td_cmd = I40E_TX_DESC_CMD_ICRC;
1276
1277        /* setup MACLEN */
1278        maclen = skb_network_offset(skb);
1279        if (tx_flags & I40E_TX_FLAGS_SW_VLAN)
1280                maclen += sizeof(struct vlan_hdr);
1281
1282        if (skb->protocol == htons(ETH_P_FCOE)) {
1283                /* for FCoE, maclen should exclude ether type */
1284                maclen -= 2;
1285                /* setup type as FCoE and EOF insertion */
1286                td_cmd |= (I40E_TX_DESC_CMD_FCOET | i40e_fcoe_ctxt_eof(eof));
1287                /* setup FCoELEN and FCLEN */
1288                td_offset |= ((((sizeof(struct fcoe_hdr) + 2) >> 2) <<
1289                                I40E_TX_DESC_LENGTH_IPLEN_SHIFT) |
1290                              ((sizeof(struct fc_frame_header) >> 2) <<
1291                                I40E_TX_DESC_LENGTH_L4_FC_LEN_SHIFT));
1292                /* trim to exclude trailer */
1293                pskb_trim(skb, skb->len - sizeof(struct fcoe_crc_eof));
1294        }
1295
1296        /* MACLEN is ether header length in words not bytes */
1297        td_offset |= (maclen >> 1) << I40E_TX_DESC_LENGTH_MACLEN_SHIFT;
1298
1299        i40e_tx_map(tx_ring, skb, first, tx_flags, hdr_len, td_cmd, td_offset);
1300}
1301
1302/**
1303 * i40e_fcoe_set_skb_header - adjust skb header point for FIP/FCoE/FC
1304 * @skb: the skb to be adjusted
1305 *
1306 * Returns true if this skb is a FCoE/FIP or VLAN carried FCoE/FIP and then
1307 * adjusts the skb header pointers correspondingly. Otherwise, returns false.
1308 **/
1309static inline int i40e_fcoe_set_skb_header(struct sk_buff *skb)
1310{
1311        __be16 protocol = skb->protocol;
1312
1313        skb_reset_mac_header(skb);
1314        skb->mac_len = sizeof(struct ethhdr);
1315        if (protocol == htons(ETH_P_8021Q)) {
1316                struct vlan_ethhdr *veth = (struct vlan_ethhdr *)eth_hdr(skb);
1317
1318                protocol = veth->h_vlan_encapsulated_proto;
1319                skb->mac_len += sizeof(struct vlan_hdr);
1320        }
1321
1322        /* FCoE or FIP only */
1323        if ((protocol != htons(ETH_P_FIP)) &&
1324            (protocol != htons(ETH_P_FCOE)))
1325                return -EINVAL;
1326
1327        /* set header to L2 of FCoE/FIP */
1328        skb_set_network_header(skb, skb->mac_len);
1329        if (protocol == htons(ETH_P_FIP))
1330                return 0;
1331
1332        /* set header to L3 of FC */
1333        skb_set_transport_header(skb, skb->mac_len + sizeof(struct fcoe_hdr));
1334        return 0;
1335}
1336
1337/**
1338 * i40e_fcoe_xmit_frame - transmit buffer
1339 * @skb:     send buffer
1340 * @netdev:  the fcoe netdev
1341 *
1342 * Returns 0 if sent, else an error code
1343 **/
1344static netdev_tx_t i40e_fcoe_xmit_frame(struct sk_buff *skb,
1345                                        struct net_device *netdev)
1346{
1347        struct i40e_netdev_priv *np = netdev_priv(skb->dev);
1348        struct i40e_vsi *vsi = np->vsi;
1349        struct i40e_ring *tx_ring = vsi->tx_rings[skb->queue_mapping];
1350        struct i40e_tx_buffer *first;
1351        u32 tx_flags = 0;
1352        int fso, count;
1353        u8 hdr_len = 0;
1354        u8 sof = 0;
1355        u8 eof = 0;
1356
1357        if (i40e_fcoe_set_skb_header(skb))
1358                goto out_drop;
1359
1360        count = i40e_xmit_descriptor_count(skb);
1361        if (i40e_chk_linearize(skb, count)) {
1362                if (__skb_linearize(skb))
1363                        goto out_drop;
1364                count = i40e_txd_use_count(skb->len);
1365                tx_ring->tx_stats.tx_linearize++;
1366        }
1367
1368        /* need: 1 descriptor per page * PAGE_SIZE/I40E_MAX_DATA_PER_TXD,
1369         *       + 1 desc for skb_head_len/I40E_MAX_DATA_PER_TXD,
1370         *       + 4 desc gap to avoid the cache line where head is,
1371         *       + 1 desc for context descriptor,
1372         * otherwise try next time
1373         */
1374        if (i40e_maybe_stop_tx(tx_ring, count + 4 + 1)) {
1375                tx_ring->tx_stats.tx_busy++;
1376                return NETDEV_TX_BUSY;
1377        }
1378
1379        /* prepare the xmit flags */
1380        if (i40e_tx_prepare_vlan_flags(skb, tx_ring, &tx_flags))
1381                goto out_drop;
1382
1383        /* record the location of the first descriptor for this packet */
1384        first = &tx_ring->tx_bi[tx_ring->next_to_use];
1385
1386        /* FIP is a regular L2 traffic w/o offload */
1387        if (skb->protocol == htons(ETH_P_FIP))
1388                goto out_send;
1389
1390        /* check sof and eof, only supports FC Class 2 or 3 */
1391        if (i40e_fcoe_fc_sof(skb, &sof) || i40e_fcoe_fc_eof(skb, &eof)) {
1392                netdev_err(netdev, "SOF/EOF error:%02x - %02x\n", sof, eof);
1393                goto out_drop;
1394        }
1395
1396        /* always do FCCRC for FCoE */
1397        tx_flags |= I40E_TX_FLAGS_FCCRC;
1398
1399        /* check we should do sequence offload */
1400        fso = i40e_fcoe_tso(tx_ring, skb, tx_flags, &hdr_len, sof);
1401        if (fso < 0)
1402                goto out_drop;
1403        else if (fso)
1404                tx_flags |= I40E_TX_FLAGS_FSO;
1405        else
1406                i40e_fcoe_handle_ddp(tx_ring, skb, sof);
1407
1408out_send:
1409        /* send out the packet */
1410        i40e_fcoe_tx_map(tx_ring, skb, first, tx_flags, hdr_len, eof);
1411
1412        i40e_maybe_stop_tx(tx_ring, DESC_NEEDED);
1413        return NETDEV_TX_OK;
1414
1415out_drop:
1416        dev_kfree_skb_any(skb);
1417        return NETDEV_TX_OK;
1418}
1419
1420/**
1421 * i40e_fcoe_change_mtu - NDO callback to change the Maximum Transfer Unit
1422 * @netdev: network interface device structure
1423 * @new_mtu: new value for maximum frame size
1424 *
1425 * Returns error as operation not permitted
1426 *
1427 **/
1428static int i40e_fcoe_change_mtu(struct net_device *netdev, int new_mtu)
1429{
1430        netdev_warn(netdev, "MTU change is not supported on FCoE interfaces\n");
1431        return -EPERM;
1432}
1433
1434/**
1435 * i40e_fcoe_set_features - set the netdev feature flags
1436 * @netdev: ptr to the netdev being adjusted
1437 * @features: the feature set that the stack is suggesting
1438 *
1439 **/
1440static int i40e_fcoe_set_features(struct net_device *netdev,
1441                                  netdev_features_t features)
1442{
1443        struct i40e_netdev_priv *np = netdev_priv(netdev);
1444        struct i40e_vsi *vsi = np->vsi;
1445
1446        if (features & NETIF_F_HW_VLAN_CTAG_RX)
1447                i40e_vlan_stripping_enable(vsi);
1448        else
1449                i40e_vlan_stripping_disable(vsi);
1450
1451        return 0;
1452}
1453
1454static const struct net_device_ops i40e_fcoe_netdev_ops = {
1455        .ndo_open               = i40e_open,
1456        .ndo_stop               = i40e_close,
1457        .ndo_get_stats64        = i40e_get_netdev_stats_struct,
1458        .ndo_set_rx_mode        = i40e_set_rx_mode,
1459        .ndo_validate_addr      = eth_validate_addr,
1460        .ndo_set_mac_address    = i40e_set_mac,
1461        .ndo_change_mtu         = i40e_fcoe_change_mtu,
1462        .ndo_do_ioctl           = i40e_ioctl,
1463        .ndo_tx_timeout         = i40e_tx_timeout,
1464        .ndo_vlan_rx_add_vid    = i40e_vlan_rx_add_vid,
1465        .ndo_vlan_rx_kill_vid   = i40e_vlan_rx_kill_vid,
1466        .ndo_setup_tc           = __i40e_setup_tc,
1467
1468#ifdef CONFIG_NET_POLL_CONTROLLER
1469        .ndo_poll_controller    = i40e_netpoll,
1470#endif
1471        .ndo_start_xmit         = i40e_fcoe_xmit_frame,
1472        .ndo_fcoe_enable        = i40e_fcoe_enable,
1473        .ndo_fcoe_disable       = i40e_fcoe_disable,
1474        .ndo_fcoe_ddp_setup     = i40e_fcoe_ddp_get,
1475        .ndo_fcoe_ddp_done      = i40e_fcoe_ddp_put,
1476        .ndo_fcoe_ddp_target    = i40e_fcoe_ddp_target,
1477        .ndo_set_features       = i40e_fcoe_set_features,
1478};
1479
1480/* fcoe network device type */
1481static struct device_type fcoe_netdev_type = {
1482        .name = "fcoe",
1483};
1484
1485/**
1486 * i40e_fcoe_config_netdev - prepares the VSI context for creating a FCoE VSI
1487 * @vsi: pointer to the associated VSI struct
1488 * @ctxt: pointer to the associated VSI context to be passed to HW
1489 *
1490 * Returns 0 on success or < 0 on error
1491 **/
1492void i40e_fcoe_config_netdev(struct net_device *netdev, struct i40e_vsi *vsi)
1493{
1494        struct i40e_hw *hw = &vsi->back->hw;
1495        struct i40e_pf *pf = vsi->back;
1496
1497        if (vsi->type != I40E_VSI_FCOE)
1498                return;
1499
1500        netdev->features = (NETIF_F_HW_VLAN_CTAG_TX |
1501                            NETIF_F_HW_VLAN_CTAG_RX |
1502                            NETIF_F_HW_VLAN_CTAG_FILTER);
1503
1504        netdev->vlan_features = netdev->features;
1505        netdev->vlan_features &= ~(NETIF_F_HW_VLAN_CTAG_TX |
1506                                   NETIF_F_HW_VLAN_CTAG_RX |
1507                                   NETIF_F_HW_VLAN_CTAG_FILTER);
1508        netdev->fcoe_ddp_xid = I40E_FCOE_DDP_MAX - 1;
1509        netdev->features |= NETIF_F_ALL_FCOE;
1510        netdev->vlan_features |= NETIF_F_ALL_FCOE;
1511        netdev->hw_features |= netdev->features;
1512        netdev->priv_flags |= IFF_UNICAST_FLT;
1513        netdev->priv_flags |= IFF_SUPP_NOFCS;
1514
1515        strlcpy(netdev->name, "fcoe%d", IFNAMSIZ-1);
1516        netdev->mtu = FCOE_MTU;
1517        SET_NETDEV_DEV(netdev, &pf->pdev->dev);
1518        SET_NETDEV_DEVTYPE(netdev, &fcoe_netdev_type);
1519        /* set different dev_port value 1 for FCoE netdev than the default
1520         * zero dev_port value for PF netdev, this helps biosdevname user
1521         * tool to differentiate them correctly while both attached to the
1522         * same PCI function.
1523         */
1524        netdev->dev_port = 1;
1525        spin_lock_bh(&vsi->mac_filter_hash_lock);
1526        i40e_add_filter(vsi, hw->mac.san_addr, 0);
1527        i40e_add_filter(vsi, (u8[6]) FC_FCOE_FLOGI_MAC, 0);
1528        i40e_add_filter(vsi, FIP_ALL_FCOE_MACS, 0);
1529        i40e_add_filter(vsi, FIP_ALL_ENODE_MACS, 0);
1530        spin_unlock_bh(&vsi->mac_filter_hash_lock);
1531
1532        /* use san mac */
1533        ether_addr_copy(netdev->dev_addr, hw->mac.san_addr);
1534        ether_addr_copy(netdev->perm_addr, hw->mac.san_addr);
1535        /* fcoe netdev ops */
1536        netdev->netdev_ops = &i40e_fcoe_netdev_ops;
1537}
1538
1539/**
1540 * i40e_fcoe_vsi_setup - allocate and set up FCoE VSI
1541 * @pf: the PF that VSI is associated with
1542 *
1543 **/
1544void i40e_fcoe_vsi_setup(struct i40e_pf *pf)
1545{
1546        struct i40e_vsi *vsi;
1547        u16 seid;
1548        int i;
1549
1550        if (!(pf->flags & I40E_FLAG_FCOE_ENABLED))
1551                return;
1552
1553        for (i = 0; i < pf->num_alloc_vsi; i++) {
1554                vsi = pf->vsi[i];
1555                if (vsi && vsi->type == I40E_VSI_FCOE) {
1556                        dev_warn(&pf->pdev->dev,
1557                                 "FCoE VSI already created\n");
1558                        return;
1559                }
1560        }
1561
1562        seid = pf->vsi[pf->lan_vsi]->seid;
1563        vsi = i40e_vsi_setup(pf, I40E_VSI_FCOE, seid, 0);
1564        if (vsi) {
1565                dev_dbg(&pf->pdev->dev,
1566                        "Successfully created FCoE VSI seid %d id %d uplink_seid %d PF seid %d\n",
1567                        vsi->seid, vsi->id, vsi->uplink_seid, seid);
1568        } else {
1569                dev_info(&pf->pdev->dev, "Failed to create FCoE VSI\n");
1570        }
1571}
1572