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