drivers/net/ixgbe/ixgbe_fcoe.c

   1 /*******************************************************************************
   2
   3   Intel 10 Gigabit PCI Express Linux driver
   4   Copyright(c) 1999 - 2011 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 with
  16   this program; if not, write to the Free Software Foundation, Inc.,
  17   51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  18
  19   The full GNU General Public License is included in this distribution in
  20   the file called "COPYING".
  21
  22   Contact Information:
  23   e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  24   Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  25
  26 *******************************************************************************/
  27
  28 #include "ixgbe.h"
  29 #ifdef CONFIG_IXGBE_DCB
  30 #include "ixgbe_dcb_82599.h"
  31 #endif /* CONFIG_IXGBE_DCB */
  32 #include <linux/if_ether.h>
  33 #include <linux/gfp.h>
  34 #include <linux/if_vlan.h>
  35 #include <scsi/scsi_cmnd.h>
  36 #include <scsi/scsi_device.h>
  37 #include <scsi/fc/fc_fs.h>
  38 #include <scsi/fc/fc_fcoe.h>
  39 #include <scsi/libfc.h>
  40 #include <scsi/libfcoe.h>
  41
  42 /**
  43  * ixgbe_rx_is_fcoe - check the rx desc for incoming pkt type
  44  * @rx_desc: advanced rx descriptor
  45  *
  46  * Returns : true if it is FCoE pkt
  47  */
  48 static inline bool ixgbe_rx_is_fcoe(union ixgbe_adv_rx_desc *rx_desc)
  49 {
  50         u16 p;
  51
  52         p = le16_to_cpu(rx_desc->wb.lower.lo_dword.hs_rss.pkt_info);
  53         if (p & IXGBE_RXDADV_PKTTYPE_ETQF) {
  54                 p &= IXGBE_RXDADV_PKTTYPE_ETQF_MASK;
  55                 p >>= IXGBE_RXDADV_PKTTYPE_ETQF_SHIFT;
  56                 return p == IXGBE_ETQF_FILTER_FCOE;
  57         }
  58         return false;
  59 }
  60
  61 /**
  62  * ixgbe_fcoe_clear_ddp - clear the given ddp context
  63  * @ddp - ptr to the ixgbe_fcoe_ddp
  64  *
  65  * Returns : none
  66  *
  67  */
  68 static inline void ixgbe_fcoe_clear_ddp(struct ixgbe_fcoe_ddp *ddp)
  69 {
  70         ddp->len = 0;
  71         ddp->err = 1;
  72         ddp->udl = NULL;
  73         ddp->udp = 0UL;
  74         ddp->sgl = NULL;
  75         ddp->sgc = 0;
  76 }
  77
  78 /**
  79  * ixgbe_fcoe_ddp_put - free the ddp context for a given xid
  80  * @netdev: the corresponding net_device
  81  * @xid: the xid that corresponding ddp will be freed
  82  *
  83  * This is the implementation of net_device_ops.ndo_fcoe_ddp_done
  84  * and it is expected to be called by ULD, i.e., FCP layer of libfc
  85  * to release the corresponding ddp context when the I/O is done.
  86  *
  87  * Returns : data length already ddp-ed in bytes
  88  */
  89 int ixgbe_fcoe_ddp_put(struct net_device *netdev, u16 xid)
  90 {
  91         int len = 0;
  92         struct ixgbe_fcoe *fcoe;
  93         struct ixgbe_adapter *adapter;
  94         struct ixgbe_fcoe_ddp *ddp;
  95         u32 fcbuff;
  96
  97         if (!netdev)
  98                 goto out_ddp_put;
  99
 100         if (xid >= IXGBE_FCOE_DDP_MAX)
 101                 goto out_ddp_put;
 102
 103         adapter = netdev_priv(netdev);
 104         fcoe = &adapter->fcoe;
 105         ddp = &fcoe->ddp[xid];
 106         if (!ddp->udl)
 107                 goto out_ddp_put;
 108
 109         len = ddp->len;
 110         /* if there an error, force to invalidate ddp context */
 111         if (ddp->err) {
 112                 spin_lock_bh(&fcoe->lock);
 113                 IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCFLT, 0);
 114                 IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCFLTRW,
 115                                 (xid | IXGBE_FCFLTRW_WE));
 116                 IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCBUFF, 0);
 117                 IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCDMARW,
 118                                 (xid | IXGBE_FCDMARW_WE));
 119
 120                 /* guaranteed to be invalidated after 100us */
 121                 IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCDMARW,
 122                                 (xid | IXGBE_FCDMARW_RE));
 123                 fcbuff = IXGBE_READ_REG(&adapter->hw, IXGBE_FCBUFF);
 124                 spin_unlock_bh(&fcoe->lock);
 125                 if (fcbuff & IXGBE_FCBUFF_VALID)
 126                         udelay(100);
 127         }
 128         if (ddp->sgl)
 129                 pci_unmap_sg(adapter->pdev, ddp->sgl, ddp->sgc,
 130                              DMA_FROM_DEVICE);
 131         pci_pool_free(fcoe->pool, ddp->udl, ddp->udp);
 132         ixgbe_fcoe_clear_ddp(ddp);
 133
 134 out_ddp_put:
 135         return len;
 136 }
 137
 138
 139 /**
 140  * ixgbe_fcoe_ddp_setup - called to set up ddp context
 141  * @netdev: the corresponding net_device
 142  * @xid: the exchange id requesting ddp
 143  * @sgl: the scatter-gather list for this request
 144  * @sgc: the number of scatter-gather items
 145  *
 146  * Returns : 1 for success and 0 for no ddp
 147  */
 148 static int ixgbe_fcoe_ddp_setup(struct net_device *netdev, u16 xid,
 149                                 struct scatterlist *sgl, unsigned int sgc,
 150                                 int target_mode)
 151 {
 152         struct ixgbe_adapter *adapter;
 153         struct ixgbe_hw *hw;
 154         struct ixgbe_fcoe *fcoe;
 155         struct ixgbe_fcoe_ddp *ddp;
 156         struct scatterlist *sg;
 157         unsigned int i, j, dmacount;
 158         unsigned int len;
 159         static const unsigned int bufflen = IXGBE_FCBUFF_MIN;
 160         unsigned int firstoff = 0;
 161         unsigned int lastsize;
 162         unsigned int thisoff = 0;
 163         unsigned int thislen = 0;
 164         u32 fcbuff, fcdmarw, fcfltrw, fcrxctl;
 165         dma_addr_t addr = 0;
 166
 167         if (!netdev || !sgl)
 168                 return 0;
 169
 170         adapter = netdev_priv(netdev);
 171         if (xid >= IXGBE_FCOE_DDP_MAX) {
 172                 e_warn(drv, "xid=0x%x out-of-range\n", xid);
 173                 return 0;
 174         }
 175
 176         /* no DDP if we are already down or resetting */
 177         if (test_bit(__IXGBE_DOWN, &adapter->state) ||
 178             test_bit(__IXGBE_RESETTING, &adapter->state))
 179                 return 0;
 180
 181         fcoe = &adapter->fcoe;
 182         if (!fcoe->pool) {
 183                 e_warn(drv, "xid=0x%x no ddp pool for fcoe\n", xid);
 184                 return 0;
 185         }
 186
 187         ddp = &fcoe->ddp[xid];
 188         if (ddp->sgl) {
 189                 e_err(drv, "xid 0x%x w/ non-null sgl=%p nents=%d\n",
 190                       xid, ddp->sgl, ddp->sgc);
 191                 return 0;
 192         }
 193         ixgbe_fcoe_clear_ddp(ddp);
 194
 195         /* setup dma from scsi command sgl */
 196         dmacount = pci_map_sg(adapter->pdev, sgl, sgc, DMA_FROM_DEVICE);
 197         if (dmacount == 0) {
 198                 e_err(drv, "xid 0x%x DMA map error\n", xid);
 199                 return 0;
 200         }
 201
 202         /* alloc the udl from our ddp pool */
 203         ddp->udl = pci_pool_alloc(fcoe->pool, GFP_ATOMIC, &ddp->udp);
 204         if (!ddp->udl) {
 205                 e_err(drv, "failed allocated ddp context\n");
 206                 goto out_noddp_unmap;
 207         }
 208         ddp->sgl = sgl;
 209         ddp->sgc = sgc;
 210
 211         j = 0;
 212         for_each_sg(sgl, sg, dmacount, i) {
 213                 addr = sg_dma_address(sg);
 214                 len = sg_dma_len(sg);
 215                 while (len) {
 216                         /* max number of buffers allowed in one DDP context */
 217                         if (j >= IXGBE_BUFFCNT_MAX) {
 218                                 e_err(drv, "xid=%x:%d,%d,%d:addr=%llx "
 219                                       "not enough descriptors\n",
 220                                       xid, i, j, dmacount, (u64)addr);
 221                                 goto out_noddp_free;
 222                         }
 223
 224                         /* get the offset of length of current buffer */
 225                         thisoff = addr & ((dma_addr_t)bufflen - 1);
 226                         thislen = min((bufflen - thisoff), len);
 227                         /*
 228                          * all but the 1st buffer (j == 0)
 229                          * must be aligned on bufflen
 230                          */
 231                         if ((j != 0) && (thisoff))
 232                                 goto out_noddp_free;
 233                         /*
 234                          * all but the last buffer
 235                          * ((i == (dmacount - 1)) && (thislen == len))
 236                          * must end at bufflen
 237                          */
 238                         if (((i != (dmacount - 1)) || (thislen != len))
 239                             && ((thislen + thisoff) != bufflen))
 240                                 goto out_noddp_free;
 241
 242                         ddp->udl[j] = (u64)(addr - thisoff);
 243                         /* only the first buffer may have none-zero offset */
 244                         if (j == 0)
 245                                 firstoff = thisoff;
 246                         len -= thislen;
 247                         addr += thislen;
 248                         j++;
 249                 }
 250         }
 251         /* only the last buffer may have non-full bufflen */
 252         lastsize = thisoff + thislen;
 253
 254         /*
 255          * lastsize can not be buffer len.
 256          * If it is then adding another buffer with lastsize = 1.
 257          */
 258         if (lastsize == bufflen) {
 259                 if (j >= IXGBE_BUFFCNT_MAX) {
 260                         e_err(drv, "xid=%x:%d,%d,%d:addr=%llx "
 261                                 "not enough user buffers. We need an extra "
 262                                 "buffer because lastsize is bufflen.\n",
 263                                 xid, i, j, dmacount, (u64)addr);
 264                         goto out_noddp_free;
 265                 }
 266
 267                 ddp->udl[j] = (u64)(fcoe->extra_ddp_buffer_dma);
 268                 j++;
 269                 lastsize = 1;
 270         }
 271
 272         fcbuff = (IXGBE_FCBUFF_4KB << IXGBE_FCBUFF_BUFFSIZE_SHIFT);
 273         fcbuff |= ((j & 0xff) << IXGBE_FCBUFF_BUFFCNT_SHIFT);
 274         fcbuff |= (firstoff << IXGBE_FCBUFF_OFFSET_SHIFT);
 275         /* Set WRCONTX bit to allow DDP for target */
 276         if (target_mode)
 277                 fcbuff |= (IXGBE_FCBUFF_WRCONTX);
 278         fcbuff |= (IXGBE_FCBUFF_VALID);
 279
 280         fcdmarw = xid;
 281         fcdmarw |= IXGBE_FCDMARW_WE;
 282         fcdmarw |= (lastsize << IXGBE_FCDMARW_LASTSIZE_SHIFT);
 283
 284         fcfltrw = xid;
 285         fcfltrw |= IXGBE_FCFLTRW_WE;
 286
 287         /* program DMA context */
 288         hw = &adapter->hw;
 289         spin_lock_bh(&fcoe->lock);
 290
 291         /* turn on last frame indication for target mode as FCP_RSPtarget is
 292          * supposed to send FCP_RSP when it is done. */
 293         if (target_mode && !test_bit(__IXGBE_FCOE_TARGET, &fcoe->mode)) {
 294                 set_bit(__IXGBE_FCOE_TARGET, &fcoe->mode);
 295                 fcrxctl = IXGBE_READ_REG(hw, IXGBE_FCRXCTRL);
 296                 fcrxctl |= IXGBE_FCRXCTRL_LASTSEQH;
 297                 IXGBE_WRITE_REG(hw, IXGBE_FCRXCTRL, fcrxctl);
 298         }
 299
 300         IXGBE_WRITE_REG(hw, IXGBE_FCPTRL, ddp->udp & DMA_BIT_MASK(32));
 301         IXGBE_WRITE_REG(hw, IXGBE_FCPTRH, (u64)ddp->udp >> 32);
 302         IXGBE_WRITE_REG(hw, IXGBE_FCBUFF, fcbuff);
 303         IXGBE_WRITE_REG(hw, IXGBE_FCDMARW, fcdmarw);
 304         /* program filter context */
 305         IXGBE_WRITE_REG(hw, IXGBE_FCPARAM, 0);
 306         IXGBE_WRITE_REG(hw, IXGBE_FCFLT, IXGBE_FCFLT_VALID);
 307         IXGBE_WRITE_REG(hw, IXGBE_FCFLTRW, fcfltrw);
 308
 309         spin_unlock_bh(&fcoe->lock);
 310
 311         return 1;
 312
 313 out_noddp_free:
 314         pci_pool_free(fcoe->pool, ddp->udl, ddp->udp);
 315         ixgbe_fcoe_clear_ddp(ddp);
 316
 317 out_noddp_unmap:
 318         pci_unmap_sg(adapter->pdev, sgl, sgc, DMA_FROM_DEVICE);
 319         return 0;
 320 }
 321
 322 /**
 323  * ixgbe_fcoe_ddp_get - called to set up ddp context in initiator mode
 324  * @netdev: the corresponding net_device
 325  * @xid: the exchange id requesting ddp
 326  * @sgl: the scatter-gather list for this request
 327  * @sgc: the number of scatter-gather items
 328  *
 329  * This is the implementation of net_device_ops.ndo_fcoe_ddp_setup
 330  * and is expected to be called from ULD, e.g., FCP layer of libfc
 331  * to set up ddp for the corresponding xid of the given sglist for
 332  * the corresponding I/O.
 333  *
 334  * Returns : 1 for success and 0 for no ddp
 335  */
 336 int ixgbe_fcoe_ddp_get(struct net_device *netdev, u16 xid,
 337                        struct scatterlist *sgl, unsigned int sgc)
 338 {
 339         return ixgbe_fcoe_ddp_setup(netdev, xid, sgl, sgc, 0);
 340 }
 341
 342 /**
 343  * ixgbe_fcoe_ddp_target - called to set up ddp context in target mode
 344  * @netdev: the corresponding net_device
 345  * @xid: the exchange id requesting ddp
 346  * @sgl: the scatter-gather list for this request
 347  * @sgc: the number of scatter-gather items
 348  *
 349  * This is the implementation of net_device_ops.ndo_fcoe_ddp_target
 350  * and is expected to be called from ULD, e.g., FCP layer of libfc
 351  * to set up ddp for the corresponding xid of the given sglist for
 352  * the corresponding I/O. The DDP in target mode is a write I/O request
 353  * from the initiator.
 354  *
 355  * Returns : 1 for success and 0 for no ddp
 356  */
 357 int ixgbe_fcoe_ddp_target(struct net_device *netdev, u16 xid,
 358                             struct scatterlist *sgl, unsigned int sgc)
 359 {
 360         return ixgbe_fcoe_ddp_setup(netdev, xid, sgl, sgc, 1);
 361 }
 362
 363 /**
 364  * ixgbe_fcoe_ddp - check ddp status and mark it done
 365  * @adapter: ixgbe adapter
 366  * @rx_desc: advanced rx descriptor
 367  * @skb: the skb holding the received data
 368  *
 369  * This checks ddp status.
 370  *
 371  * Returns : < 0 indicates an error or not a FCiE ddp, 0 indicates
 372  * not passing the skb to ULD, > 0 indicates is the length of data
 373  * being ddped.
 374  */
 375 int ixgbe_fcoe_ddp(struct ixgbe_adapter *adapter,
 376                    union ixgbe_adv_rx_desc *rx_desc,
 377                    struct sk_buff *skb)
 378 {
 379         u16 xid;
 380         u32 fctl;
 381         u32 sterr, fceofe, fcerr, fcstat;
 382         int rc = -EINVAL;
 383         struct ixgbe_fcoe *fcoe;
 384         struct ixgbe_fcoe_ddp *ddp;
 385         struct fc_frame_header *fh;
 386         struct fcoe_crc_eof *crc;
 387
 388         if (!ixgbe_rx_is_fcoe(rx_desc))
 389                 goto ddp_out;
 390
 391         sterr = le32_to_cpu(rx_desc->wb.upper.status_error);
 392         fcerr = (sterr & IXGBE_RXDADV_ERR_FCERR);
 393         fceofe = (sterr & IXGBE_RXDADV_ERR_FCEOFE);
 394         if (fcerr == IXGBE_FCERR_BADCRC)
 395                 skb_checksum_none_assert(skb);
 396         else
 397                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 398
 399         if (eth_hdr(skb)->h_proto == htons(ETH_P_8021Q))
 400                 fh = (struct fc_frame_header *)(skb->data +
 401                         sizeof(struct vlan_hdr) + sizeof(struct fcoe_hdr));
 402         else
 403                 fh = (struct fc_frame_header *)(skb->data +
 404                         sizeof(struct fcoe_hdr));
 405         fctl = ntoh24(fh->fh_f_ctl);
 406         if (fctl & FC_FC_EX_CTX)
 407                 xid =  be16_to_cpu(fh->fh_ox_id);
 408         else
 409                 xid =  be16_to_cpu(fh->fh_rx_id);
 410
 411         if (xid >= IXGBE_FCOE_DDP_MAX)
 412                 goto ddp_out;
 413
 414         fcoe = &adapter->fcoe;
 415         ddp = &fcoe->ddp[xid];
 416         if (!ddp->udl)
 417                 goto ddp_out;
 418
 419         if (fcerr | fceofe)
 420                 goto ddp_out;
 421
 422         fcstat = (sterr & IXGBE_RXDADV_STAT_FCSTAT);
 423         if (fcstat) {
 424                 /* update length of DDPed data */
 425                 ddp->len = le32_to_cpu(rx_desc->wb.lower.hi_dword.rss);
 426                 /* unmap the sg list when FCP_RSP is received */
 427                 if (fcstat == IXGBE_RXDADV_STAT_FCSTAT_FCPRSP) {
 428                         pci_unmap_sg(adapter->pdev, ddp->sgl,
 429                                      ddp->sgc, DMA_FROM_DEVICE);
 430                         ddp->err = (fcerr | fceofe);
 431                         ddp->sgl = NULL;
 432                         ddp->sgc = 0;
 433                 }
 434                 /* return 0 to bypass going to ULD for DDPed data */
 435                 if (fcstat == IXGBE_RXDADV_STAT_FCSTAT_DDP)
 436                         rc = 0;
 437                 else if (ddp->len)
 438                         rc = ddp->len;
 439         }
 440         /* In target mode, check the last data frame of the sequence.
 441          * For DDP in target mode, data is already DDPed but the header
 442          * indication of the last data frame ould allow is to tell if we
 443          * got all the data and the ULP can send FCP_RSP back, as this is
 444          * not a full fcoe frame, we fill the trailer here so it won't be
 445          * dropped by the ULP stack.
 446          */
 447         if ((fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA) &&
 448             (fctl & FC_FC_END_SEQ)) {
 449                 crc = (struct fcoe_crc_eof *)skb_put(skb, sizeof(*crc));
 450                 crc->fcoe_eof = FC_EOF_T;
 451         }
 452 ddp_out:
 453         return rc;
 454 }
 455
 456 /**
 457  * ixgbe_fso - ixgbe FCoE Sequence Offload (FSO)
 458  * @adapter: ixgbe adapter
 459  * @tx_ring: tx desc ring
 460  * @skb: associated skb
 461  * @tx_flags: tx flags
 462  * @hdr_len: hdr_len to be returned
 463  *
 464  * This sets up large send offload for FCoE
 465  *
 466  * Returns : 0 indicates no FSO, > 0 for FSO, < 0 for error
 467  */
 468 int ixgbe_fso(struct ixgbe_adapter *adapter,
 469               struct ixgbe_ring *tx_ring, struct sk_buff *skb,
 470               u32 tx_flags, u8 *hdr_len)
 471 {
 472         u8 sof, eof;
 473         u32 vlan_macip_lens;
 474         u32 fcoe_sof_eof;
 475         u32 type_tucmd;
 476         u32 mss_l4len_idx;
 477         int mss = 0;
 478         unsigned int i;
 479         struct ixgbe_tx_buffer *tx_buffer_info;
 480         struct ixgbe_adv_tx_context_desc *context_desc;
 481         struct fc_frame_header *fh;
 482
 483         if (skb_is_gso(skb) && (skb_shinfo(skb)->gso_type != SKB_GSO_FCOE)) {
 484                 e_err(drv, "Wrong gso type %d:expecting SKB_GSO_FCOE\n",
 485                       skb_shinfo(skb)->gso_type);
 486                 return -EINVAL;
 487         }
 488
 489         /* resets the header to point fcoe/fc */
 490         skb_set_network_header(skb, skb->mac_len);
 491         skb_set_transport_header(skb, skb->mac_len +
 492                                  sizeof(struct fcoe_hdr));
 493
 494         /* sets up SOF and ORIS */
 495         fcoe_sof_eof = 0;
 496         sof = ((struct fcoe_hdr *)skb_network_header(skb))->fcoe_sof;
 497         switch (sof) {
 498         case FC_SOF_I2:
 499                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_ORIS;
 500                 break;
 501         case FC_SOF_I3:
 502                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_SOF;
 503                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_ORIS;
 504                 break;
 505         case FC_SOF_N2:
 506                 break;
 507         case FC_SOF_N3:
 508                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_SOF;
 509                 break;
 510         default:
 511                 e_warn(drv, "unknown sof = 0x%x\n", sof);
 512                 return -EINVAL;
 513         }
 514
 515         /* the first byte of the last dword is EOF */
 516         skb_copy_bits(skb, skb->len - 4, &eof, 1);
 517         /* sets up EOF and ORIE */
 518         switch (eof) {
 519         case FC_EOF_N:
 520                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_N;
 521                 break;
 522         case FC_EOF_T:
 523                 /* lso needs ORIE */
 524                 if (skb_is_gso(skb)) {
 525                         fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_N;
 526                         fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_ORIE;
 527                 } else {
 528                         fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_T;
 529                 }
 530                 break;
 531         case FC_EOF_NI:
 532                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_NI;
 533                 break;
 534         case FC_EOF_A:
 535                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_A;
 536                 break;
 537         default:
 538                 e_warn(drv, "unknown eof = 0x%x\n", eof);
 539                 return -EINVAL;
 540         }
 541
 542         /* sets up PARINC indicating data offset */
 543         fh = (struct fc_frame_header *)skb_transport_header(skb);
 544         if (fh->fh_f_ctl[2] & FC_FC_REL_OFF)
 545                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_PARINC;
 546
 547         /* hdr_len includes fc_hdr if FCoE lso is enabled */
 548         *hdr_len = sizeof(struct fcoe_crc_eof);
 549         if (skb_is_gso(skb))
 550                 *hdr_len += (skb_transport_offset(skb) +
 551                              sizeof(struct fc_frame_header));
 552         /* vlan_macip_lens: HEADLEN, MACLEN, VLAN tag */
 553         vlan_macip_lens = (skb_transport_offset(skb) +
 554                           sizeof(struct fc_frame_header));
 555         vlan_macip_lens |= ((skb_transport_offset(skb) - 4)
 556                            << IXGBE_ADVTXD_MACLEN_SHIFT);
 557         vlan_macip_lens |= (tx_flags & IXGBE_TX_FLAGS_VLAN_MASK);
 558
 559         /* type_tycmd and mss: set TUCMD.FCoE to enable offload */
 560         type_tucmd = IXGBE_TXD_CMD_DEXT | IXGBE_ADVTXD_DTYP_CTXT |
 561                      IXGBE_ADVTXT_TUCMD_FCOE;
 562         if (skb_is_gso(skb))
 563                 mss = skb_shinfo(skb)->gso_size;
 564         /* mss_l4len_id: use 1 for FSO as TSO, no need for L4LEN */
 565         mss_l4len_idx = (mss << IXGBE_ADVTXD_MSS_SHIFT) |
 566                         (1 << IXGBE_ADVTXD_IDX_SHIFT);
 567
 568         /* write context desc */
 569         i = tx_ring->next_to_use;
 570         context_desc = IXGBE_TX_CTXTDESC_ADV(tx_ring, i);
 571         context_desc->vlan_macip_lens   = cpu_to_le32(vlan_macip_lens);
 572         context_desc->seqnum_seed       = cpu_to_le32(fcoe_sof_eof);
 573         context_desc->type_tucmd_mlhl   = cpu_to_le32(type_tucmd);
 574         context_desc->mss_l4len_idx     = cpu_to_le32(mss_l4len_idx);
 575
 576         tx_buffer_info = &tx_ring->tx_buffer_info[i];
 577         tx_buffer_info->time_stamp = jiffies;
 578         tx_buffer_info->next_to_watch = i;
 579
 580         i++;
 581         if (i == tx_ring->count)
 582                 i = 0;
 583         tx_ring->next_to_use = i;
 584
 585         return skb_is_gso(skb);
 586 }
 587
 588 /**
 589  * ixgbe_configure_fcoe - configures registers for fcoe at start
 590  * @adapter: ptr to ixgbe adapter
 591  *
 592  * This sets up FCoE related registers
 593  *
 594  * Returns : none
 595  */
 596 void ixgbe_configure_fcoe(struct ixgbe_adapter *adapter)
 597 {
 598         int i, fcoe_q, fcoe_i;
 599         struct ixgbe_hw *hw = &adapter->hw;
 600         struct ixgbe_fcoe *fcoe = &adapter->fcoe;
 601         struct ixgbe_ring_feature *f = &adapter->ring_feature[RING_F_FCOE];
 602 #ifdef CONFIG_IXGBE_DCB
 603         u8 tc;
 604         u32 up2tc;
 605 #endif
 606
 607         /* create the pool for ddp if not created yet */
 608         if (!fcoe->pool) {
 609                 /* allocate ddp pool */
 610                 fcoe->pool = pci_pool_create("ixgbe_fcoe_ddp",
 611                                              adapter->pdev, IXGBE_FCPTR_MAX,
 612                                              IXGBE_FCPTR_ALIGN, PAGE_SIZE);
 613                 if (!fcoe->pool)
 614                         e_err(drv, "failed to allocated FCoE DDP pool\n");
 615
 616                 spin_lock_init(&fcoe->lock);
 617
 618                 /* Extra buffer to be shared by all DDPs for HW work around */
 619                 fcoe->extra_ddp_buffer = kmalloc(IXGBE_FCBUFF_MIN, GFP_ATOMIC);
 620                 if (fcoe->extra_ddp_buffer == NULL) {
 621                         e_err(drv, "failed to allocated extra DDP buffer\n");
 622                         goto out_extra_ddp_buffer_alloc;
 623                 }
 624
 625                 fcoe->extra_ddp_buffer_dma =
 626                         dma_map_single(&adapter->pdev->dev,
 627                                        fcoe->extra_ddp_buffer,
 628                                        IXGBE_FCBUFF_MIN,
 629                                        DMA_FROM_DEVICE);
 630                 if (dma_mapping_error(&adapter->pdev->dev,
 631                                       fcoe->extra_ddp_buffer_dma)) {
 632                         e_err(drv, "failed to map extra DDP buffer\n");
 633                         goto out_extra_ddp_buffer_dma;
 634                 }
 635         }
 636
 637         /* Enable L2 eth type filter for FCoE */
 638         IXGBE_WRITE_REG(hw, IXGBE_ETQF(IXGBE_ETQF_FILTER_FCOE),
 639                         (ETH_P_FCOE | IXGBE_ETQF_FCOE | IXGBE_ETQF_FILTER_EN));
 640         /* Enable L2 eth type filter for FIP */
 641         IXGBE_WRITE_REG(hw, IXGBE_ETQF(IXGBE_ETQF_FILTER_FIP),
 642                         (ETH_P_FIP | IXGBE_ETQF_FILTER_EN));
 643         if (adapter->ring_feature[RING_F_FCOE].indices) {
 644                 /* Use multiple rx queues for FCoE by redirection table */
 645                 for (i = 0; i < IXGBE_FCRETA_SIZE; i++) {
 646                         fcoe_i = f->mask + i % f->indices;
 647                         fcoe_i &= IXGBE_FCRETA_ENTRY_MASK;
 648                         fcoe_q = adapter->rx_ring[fcoe_i]->reg_idx;
 649                         IXGBE_WRITE_REG(hw, IXGBE_FCRETA(i), fcoe_q);
 650                 }
 651                 IXGBE_WRITE_REG(hw, IXGBE_FCRECTL, IXGBE_FCRECTL_ENA);
 652                 IXGBE_WRITE_REG(hw, IXGBE_ETQS(IXGBE_ETQF_FILTER_FCOE), 0);
 653         } else  {
 654                 /* Use single rx queue for FCoE */
 655                 fcoe_i = f->mask;
 656                 fcoe_q = adapter->rx_ring[fcoe_i]->reg_idx;
 657                 IXGBE_WRITE_REG(hw, IXGBE_FCRECTL, 0);
 658                 IXGBE_WRITE_REG(hw, IXGBE_ETQS(IXGBE_ETQF_FILTER_FCOE),
 659                                 IXGBE_ETQS_QUEUE_EN |
 660                                 (fcoe_q << IXGBE_ETQS_RX_QUEUE_SHIFT));
 661         }
 662         /* send FIP frames to the first FCoE queue */
 663         fcoe_i = f->mask;
 664         fcoe_q = adapter->rx_ring[fcoe_i]->reg_idx;
 665         IXGBE_WRITE_REG(hw, IXGBE_ETQS(IXGBE_ETQF_FILTER_FIP),
 666                         IXGBE_ETQS_QUEUE_EN |
 667                         (fcoe_q << IXGBE_ETQS_RX_QUEUE_SHIFT));
 668
 669         IXGBE_WRITE_REG(hw, IXGBE_FCRXCTRL,
 670                         IXGBE_FCRXCTRL_FCOELLI |
 671                         IXGBE_FCRXCTRL_FCCRCBO |
 672                         (FC_FCOE_VER << IXGBE_FCRXCTRL_FCOEVER_SHIFT));
 673 #ifdef CONFIG_IXGBE_DCB
 674         up2tc = IXGBE_READ_REG(&adapter->hw, IXGBE_RTTUP2TC);
 675         for (i = 0; i < MAX_USER_PRIORITY; i++) {
 676                 tc = (u8)(up2tc >> (i * IXGBE_RTTUP2TC_UP_SHIFT));
 677                 tc &= (MAX_TRAFFIC_CLASS - 1);
 678                 if (fcoe->tc == tc) {
 679                         fcoe->up = i;
 680                         break;
 681                 }
 682         }
 683 #endif
 684
 685         return;
 686
 687 out_extra_ddp_buffer_dma:
 688         kfree(fcoe->extra_ddp_buffer);
 689 out_extra_ddp_buffer_alloc:
 690         pci_pool_destroy(fcoe->pool);
 691         fcoe->pool = NULL;
 692 }
 693
 694 /**
 695  * ixgbe_cleanup_fcoe - release all fcoe ddp context resources
 696  * @adapter : ixgbe adapter
 697  *
 698  * Cleans up outstanding ddp context resources
 699  *
 700  * Returns : none
 701  */
 702 void ixgbe_cleanup_fcoe(struct ixgbe_adapter *adapter)
 703 {
 704         int i;
 705         struct ixgbe_fcoe *fcoe = &adapter->fcoe;
 706
 707         /* release ddp resource */
 708         if (fcoe->pool) {
 709                 for (i = 0; i < IXGBE_FCOE_DDP_MAX; i++)
 710                         ixgbe_fcoe_ddp_put(adapter->netdev, i);
 711                 dma_unmap_single(&adapter->pdev->dev,
 712                                  fcoe->extra_ddp_buffer_dma,
 713                                  IXGBE_FCBUFF_MIN,
 714                                  DMA_FROM_DEVICE);
 715                 kfree(fcoe->extra_ddp_buffer);
 716                 pci_pool_destroy(fcoe->pool);
 717                 fcoe->pool = NULL;
 718         }
 719 }
 720
 721 /**
 722  * ixgbe_fcoe_enable - turn on FCoE offload feature
 723  * @netdev: the corresponding netdev
 724  *
 725  * Turns on FCoE offload feature in 82599.
 726  *
 727  * Returns : 0 indicates success or -EINVAL on failure
 728  */
 729 int ixgbe_fcoe_enable(struct net_device *netdev)
 730 {
 731         int rc = -EINVAL;
 732         struct ixgbe_adapter *adapter = netdev_priv(netdev);
 733         struct ixgbe_fcoe *fcoe = &adapter->fcoe;
 734
 735
 736         if (!(adapter->flags & IXGBE_FLAG_FCOE_CAPABLE))
 737                 goto out_enable;
 738
 739         atomic_inc(&fcoe->refcnt);
 740         if (adapter->flags & IXGBE_FLAG_FCOE_ENABLED)
 741                 goto out_enable;
 742
 743         e_info(drv, "Enabling FCoE offload features.\n");
 744         if (netif_running(netdev))
 745                 netdev->netdev_ops->ndo_stop(netdev);
 746
 747         ixgbe_clear_interrupt_scheme(adapter);
 748
 749         adapter->flags |= IXGBE_FLAG_FCOE_ENABLED;
 750         adapter->ring_feature[RING_F_FCOE].indices = IXGBE_FCRETA_SIZE;
 751         netdev->features |= NETIF_F_FCOE_CRC;
 752         netdev->features |= NETIF_F_FSO;
 753         netdev->features |= NETIF_F_FCOE_MTU;
 754         netdev->fcoe_ddp_xid = IXGBE_FCOE_DDP_MAX - 1;
 755
 756         ixgbe_init_interrupt_scheme(adapter);
 757         netdev_features_change(netdev);
 758
 759         if (netif_running(netdev))
 760                 netdev->netdev_ops->ndo_open(netdev);
 761         rc = 0;
 762
 763 out_enable:
 764         return rc;
 765 }
 766
 767 /**
 768  * ixgbe_fcoe_disable - turn off FCoE offload feature
 769  * @netdev: the corresponding netdev
 770  *
 771  * Turns off FCoE offload feature in 82599.
 772  *
 773  * Returns : 0 indicates success or -EINVAL on failure
 774  */
 775 int ixgbe_fcoe_disable(struct net_device *netdev)
 776 {
 777         int rc = -EINVAL;
 778         struct ixgbe_adapter *adapter = netdev_priv(netdev);
 779         struct ixgbe_fcoe *fcoe = &adapter->fcoe;
 780
 781         if (!(adapter->flags & IXGBE_FLAG_FCOE_CAPABLE))
 782                 goto out_disable;
 783
 784         if (!(adapter->flags & IXGBE_FLAG_FCOE_ENABLED))
 785                 goto out_disable;
 786
 787         if (!atomic_dec_and_test(&fcoe->refcnt))
 788                 goto out_disable;
 789
 790         e_info(drv, "Disabling FCoE offload features.\n");
 791         netdev->features &= ~NETIF_F_FCOE_CRC;
 792         netdev->features &= ~NETIF_F_FSO;
 793         netdev->features &= ~NETIF_F_FCOE_MTU;
 794         netdev->fcoe_ddp_xid = 0;
 795         netdev_features_change(netdev);
 796
 797         if (netif_running(netdev))
 798                 netdev->netdev_ops->ndo_stop(netdev);
 799
 800         ixgbe_clear_interrupt_scheme(adapter);
 801         adapter->flags &= ~IXGBE_FLAG_FCOE_ENABLED;
 802         adapter->ring_feature[RING_F_FCOE].indices = 0;
 803         ixgbe_cleanup_fcoe(adapter);
 804         ixgbe_init_interrupt_scheme(adapter);
 805
 806         if (netif_running(netdev))
 807                 netdev->netdev_ops->ndo_open(netdev);
 808         rc = 0;
 809
 810 out_disable:
 811         return rc;
 812 }
 813
 814 #ifdef CONFIG_IXGBE_DCB
 815 /**
 816  * ixgbe_fcoe_setapp - sets the user priority bitmap for FCoE
 817  * @adapter : ixgbe adapter
 818  * @up : 802.1p user priority bitmap
 819  *
 820  * Finds out the traffic class from the input user priority
 821  * bitmap for FCoE.
 822  *
 823  * Returns : 0 on success otherwise returns 1 on error
 824  */
 825 u8 ixgbe_fcoe_setapp(struct ixgbe_adapter *adapter, u8 up)
 826 {
 827         int i;
 828         u32 up2tc;
 829
 830         /* valid user priority bitmap must not be 0 */
 831         if (up) {
 832                 /* from user priority to the corresponding traffic class */
 833                 up2tc = IXGBE_READ_REG(&adapter->hw, IXGBE_RTTUP2TC);
 834                 for (i = 0; i < MAX_USER_PRIORITY; i++) {
 835                         if (up & (1 << i)) {
 836                                 up2tc >>= (i * IXGBE_RTTUP2TC_UP_SHIFT);
 837                                 up2tc &= (MAX_TRAFFIC_CLASS - 1);
 838                                 adapter->fcoe.tc = (u8)up2tc;
 839                                 adapter->fcoe.up = i;
 840                                 return 0;
 841                         }
 842                 }
 843         }
 844
 845         return 1;
 846 }
 847 #endif /* CONFIG_IXGBE_DCB */
 848
 849 /**
 850  * ixgbe_fcoe_get_wwn - get world wide name for the node or the port
 851  * @netdev : ixgbe adapter
 852  * @wwn : the world wide name
 853  * @type: the type of world wide name
 854  *
 855  * Returns the node or port world wide name if both the prefix and the san
 856  * mac address are valid, then the wwn is formed based on the NAA-2 for
 857  * IEEE Extended name identifier (ref. to T10 FC-LS Spec., Sec. 15.3).
 858  *
 859  * Returns : 0 on success
 860  */
 861 int ixgbe_fcoe_get_wwn(struct net_device *netdev, u64 *wwn, int type)
 862 {
 863         int rc = -EINVAL;
 864         u16 prefix = 0xffff;
 865         struct ixgbe_adapter *adapter = netdev_priv(netdev);
 866         struct ixgbe_mac_info *mac = &adapter->hw.mac;
 867
 868         switch (type) {
 869         case NETDEV_FCOE_WWNN:
 870                 prefix = mac->wwnn_prefix;
 871                 break;
 872         case NETDEV_FCOE_WWPN:
 873                 prefix = mac->wwpn_prefix;
 874                 break;
 875         default:
 876                 break;
 877         }
 878
 879         if ((prefix != 0xffff) &&
 880             is_valid_ether_addr(mac->san_addr)) {
 881                 *wwn = ((u64) prefix << 48) |
 882                        ((u64) mac->san_addr[0] << 40) |
 883                        ((u64) mac->san_addr[1] << 32) |
 884                        ((u64) mac->san_addr[2] << 24) |
 885                        ((u64) mac->san_addr[3] << 16) |
 886                        ((u64) mac->san_addr[4] << 8)  |
 887                        ((u64) mac->san_addr[5]);
 888                 rc = 0;
 889         }
 890         return rc;
 891 }