drivers/net/ethernet/intel/ixgbe/ixgbe_fcoe.c

   1 /*******************************************************************************
   2
   3   Intel 10 Gigabit PCI Express Linux driver
   4   Copyright(c) 1999 - 2012 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         unsigned int cpu;
 149
 150         if (!netdev || !sgl)
 151                 return 0;
 152
 153         adapter = netdev_priv(netdev);
 154         if (xid >= IXGBE_FCOE_DDP_MAX) {
 155                 e_warn(drv, "xid=0x%x out-of-range\n", xid);
 156                 return 0;
 157         }
 158
 159         /* no DDP if we are already down or resetting */
 160         if (test_bit(__IXGBE_DOWN, &adapter->state) ||
 161             test_bit(__IXGBE_RESETTING, &adapter->state))
 162                 return 0;
 163
 164         fcoe = &adapter->fcoe;
 165         if (!fcoe->pool) {
 166                 e_warn(drv, "xid=0x%x no ddp pool for fcoe\n", xid);
 167                 return 0;
 168         }
 169
 170         ddp = &fcoe->ddp[xid];
 171         if (ddp->sgl) {
 172                 e_err(drv, "xid 0x%x w/ non-null sgl=%p nents=%d\n",
 173                       xid, ddp->sgl, ddp->sgc);
 174                 return 0;
 175         }
 176         ixgbe_fcoe_clear_ddp(ddp);
 177
 178         /* setup dma from scsi command sgl */
 179         dmacount = pci_map_sg(adapter->pdev, sgl, sgc, DMA_FROM_DEVICE);
 180         if (dmacount == 0) {
 181                 e_err(drv, "xid 0x%x DMA map error\n", xid);
 182                 return 0;
 183         }
 184
 185         /* alloc the udl from per cpu ddp pool */
 186         cpu = get_cpu();
 187         pool = *per_cpu_ptr(fcoe->pool, cpu);
 188         ddp->udl = pci_pool_alloc(pool, GFP_ATOMIC, &ddp->udp);
 189         if (!ddp->udl) {
 190                 e_err(drv, "failed allocated ddp context\n");
 191                 goto out_noddp_unmap;
 192         }
 193         ddp->pool = pool;
 194         ddp->sgl = sgl;
 195         ddp->sgc = sgc;
 196
 197         j = 0;
 198         for_each_sg(sgl, sg, dmacount, i) {
 199                 addr = sg_dma_address(sg);
 200                 len = sg_dma_len(sg);
 201                 while (len) {
 202                         /* max number of buffers allowed in one DDP context */
 203                         if (j >= IXGBE_BUFFCNT_MAX) {
 204                                 *per_cpu_ptr(fcoe->pcpu_noddp, cpu) += 1;
 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                         *per_cpu_ptr(fcoe->pcpu_noddp_ext_buff, cpu) += 1;
 245                         goto out_noddp_free;
 246                 }
 247
 248                 ddp->udl[j] = (u64)(fcoe->extra_ddp_buffer_dma);
 249                 j++;
 250                 lastsize = 1;
 251         }
 252         put_cpu();
 253
 254         fcbuff = (IXGBE_FCBUFF_4KB << IXGBE_FCBUFF_BUFFSIZE_SHIFT);
 255         fcbuff |= ((j & 0xff) << IXGBE_FCBUFF_BUFFCNT_SHIFT);
 256         fcbuff |= (firstoff << IXGBE_FCBUFF_OFFSET_SHIFT);
 257         /* Set WRCONTX bit to allow DDP for target */
 258         if (target_mode)
 259                 fcbuff |= (IXGBE_FCBUFF_WRCONTX);
 260         fcbuff |= (IXGBE_FCBUFF_VALID);
 261
 262         fcdmarw = xid;
 263         fcdmarw |= IXGBE_FCDMARW_WE;
 264         fcdmarw |= (lastsize << IXGBE_FCDMARW_LASTSIZE_SHIFT);
 265
 266         fcfltrw = xid;
 267         fcfltrw |= IXGBE_FCFLTRW_WE;
 268
 269         /* program DMA context */
 270         hw = &adapter->hw;
 271         spin_lock_bh(&fcoe->lock);
 272
 273         /* turn on last frame indication for target mode as FCP_RSPtarget is
 274          * supposed to send FCP_RSP when it is done. */
 275         if (target_mode && !test_bit(__IXGBE_FCOE_TARGET, &fcoe->mode)) {
 276                 set_bit(__IXGBE_FCOE_TARGET, &fcoe->mode);
 277                 fcrxctl = IXGBE_READ_REG(hw, IXGBE_FCRXCTRL);
 278                 fcrxctl |= IXGBE_FCRXCTRL_LASTSEQH;
 279                 IXGBE_WRITE_REG(hw, IXGBE_FCRXCTRL, fcrxctl);
 280         }
 281
 282         IXGBE_WRITE_REG(hw, IXGBE_FCPTRL, ddp->udp & DMA_BIT_MASK(32));
 283         IXGBE_WRITE_REG(hw, IXGBE_FCPTRH, (u64)ddp->udp >> 32);
 284         IXGBE_WRITE_REG(hw, IXGBE_FCBUFF, fcbuff);
 285         IXGBE_WRITE_REG(hw, IXGBE_FCDMARW, fcdmarw);
 286         /* program filter context */
 287         IXGBE_WRITE_REG(hw, IXGBE_FCPARAM, 0);
 288         IXGBE_WRITE_REG(hw, IXGBE_FCFLT, IXGBE_FCFLT_VALID);
 289         IXGBE_WRITE_REG(hw, IXGBE_FCFLTRW, fcfltrw);
 290
 291         spin_unlock_bh(&fcoe->lock);
 292
 293         return 1;
 294
 295 out_noddp_free:
 296         pci_pool_free(pool, ddp->udl, ddp->udp);
 297         ixgbe_fcoe_clear_ddp(ddp);
 298
 299 out_noddp_unmap:
 300         pci_unmap_sg(adapter->pdev, sgl, sgc, DMA_FROM_DEVICE);
 301         put_cpu();
 302         return 0;
 303 }
 304
 305 /**
 306  * ixgbe_fcoe_ddp_get - called to set up ddp context in initiator mode
 307  * @netdev: the corresponding net_device
 308  * @xid: the exchange id requesting ddp
 309  * @sgl: the scatter-gather list for this request
 310  * @sgc: the number of scatter-gather items
 311  *
 312  * This is the implementation of net_device_ops.ndo_fcoe_ddp_setup
 313  * and is expected to be called from ULD, e.g., FCP layer of libfc
 314  * to set up ddp for the corresponding xid of the given sglist for
 315  * the corresponding I/O.
 316  *
 317  * Returns : 1 for success and 0 for no ddp
 318  */
 319 int ixgbe_fcoe_ddp_get(struct net_device *netdev, u16 xid,
 320                        struct scatterlist *sgl, unsigned int sgc)
 321 {
 322         return ixgbe_fcoe_ddp_setup(netdev, xid, sgl, sgc, 0);
 323 }
 324
 325 /**
 326  * ixgbe_fcoe_ddp_target - called to set up ddp context in target mode
 327  * @netdev: the corresponding net_device
 328  * @xid: the exchange id requesting ddp
 329  * @sgl: the scatter-gather list for this request
 330  * @sgc: the number of scatter-gather items
 331  *
 332  * This is the implementation of net_device_ops.ndo_fcoe_ddp_target
 333  * and is expected to be called from ULD, e.g., FCP layer of libfc
 334  * to set up ddp for the corresponding xid of the given sglist for
 335  * the corresponding I/O. The DDP in target mode is a write I/O request
 336  * from the initiator.
 337  *
 338  * Returns : 1 for success and 0 for no ddp
 339  */
 340 int ixgbe_fcoe_ddp_target(struct net_device *netdev, u16 xid,
 341                             struct scatterlist *sgl, unsigned int sgc)
 342 {
 343         return ixgbe_fcoe_ddp_setup(netdev, xid, sgl, sgc, 1);
 344 }
 345
 346 /**
 347  * ixgbe_fcoe_ddp - check ddp status and mark it done
 348  * @adapter: ixgbe adapter
 349  * @rx_desc: advanced rx descriptor
 350  * @skb: the skb holding the received data
 351  *
 352  * This checks ddp status.
 353  *
 354  * Returns : < 0 indicates an error or not a FCiE ddp, 0 indicates
 355  * not passing the skb to ULD, > 0 indicates is the length of data
 356  * being ddped.
 357  */
 358 int ixgbe_fcoe_ddp(struct ixgbe_adapter *adapter,
 359                    union ixgbe_adv_rx_desc *rx_desc,
 360                    struct sk_buff *skb,
 361                    u32 staterr)
 362 {
 363         u16 xid;
 364         u32 fctl;
 365         u32 fceofe, fcerr, fcstat;
 366         int rc = -EINVAL;
 367         struct ixgbe_fcoe *fcoe;
 368         struct ixgbe_fcoe_ddp *ddp;
 369         struct fc_frame_header *fh;
 370         struct fcoe_crc_eof *crc;
 371
 372         fcerr = (staterr & IXGBE_RXDADV_ERR_FCERR);
 373         fceofe = (staterr & IXGBE_RXDADV_ERR_FCEOFE);
 374         if (fcerr == IXGBE_FCERR_BADCRC)
 375                 skb_checksum_none_assert(skb);
 376         else
 377                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 378
 379         if (eth_hdr(skb)->h_proto == htons(ETH_P_8021Q))
 380                 fh = (struct fc_frame_header *)(skb->data +
 381                         sizeof(struct vlan_hdr) + sizeof(struct fcoe_hdr));
 382         else
 383                 fh = (struct fc_frame_header *)(skb->data +
 384                         sizeof(struct fcoe_hdr));
 385         fctl = ntoh24(fh->fh_f_ctl);
 386         if (fctl & FC_FC_EX_CTX)
 387                 xid =  be16_to_cpu(fh->fh_ox_id);
 388         else
 389                 xid =  be16_to_cpu(fh->fh_rx_id);
 390
 391         if (xid >= IXGBE_FCOE_DDP_MAX)
 392                 goto ddp_out;
 393
 394         fcoe = &adapter->fcoe;
 395         ddp = &fcoe->ddp[xid];
 396         if (!ddp->udl)
 397                 goto ddp_out;
 398
 399         if (fcerr | fceofe)
 400                 goto ddp_out;
 401
 402         fcstat = (staterr & IXGBE_RXDADV_STAT_FCSTAT);
 403         if (fcstat) {
 404                 /* update length of DDPed data */
 405                 ddp->len = le32_to_cpu(rx_desc->wb.lower.hi_dword.rss);
 406                 /* unmap the sg list when FCP_RSP is received */
 407                 if (fcstat == IXGBE_RXDADV_STAT_FCSTAT_FCPRSP) {
 408                         pci_unmap_sg(adapter->pdev, ddp->sgl,
 409                                      ddp->sgc, DMA_FROM_DEVICE);
 410                         ddp->err = (fcerr | fceofe);
 411                         ddp->sgl = NULL;
 412                         ddp->sgc = 0;
 413                 }
 414                 /* return 0 to bypass going to ULD for DDPed data */
 415                 if (fcstat == IXGBE_RXDADV_STAT_FCSTAT_DDP)
 416                         rc = 0;
 417                 else if (ddp->len)
 418                         rc = ddp->len;
 419         }
 420         /* In target mode, check the last data frame of the sequence.
 421          * For DDP in target mode, data is already DDPed but the header
 422          * indication of the last data frame ould allow is to tell if we
 423          * got all the data and the ULP can send FCP_RSP back, as this is
 424          * not a full fcoe frame, we fill the trailer here so it won't be
 425          * dropped by the ULP stack.
 426          */
 427         if ((fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA) &&
 428             (fctl & FC_FC_END_SEQ)) {
 429                 crc = (struct fcoe_crc_eof *)skb_put(skb, sizeof(*crc));
 430                 crc->fcoe_eof = FC_EOF_T;
 431         }
 432 ddp_out:
 433         return rc;
 434 }
 435
 436 /**
 437  * ixgbe_fso - ixgbe FCoE Sequence Offload (FSO)
 438  * @tx_ring: tx desc ring
 439  * @skb: associated skb
 440  * @tx_flags: tx flags
 441  * @hdr_len: hdr_len to be returned
 442  *
 443  * This sets up large send offload for FCoE
 444  *
 445  * Returns : 0 indicates no FSO, > 0 for FSO, < 0 for error
 446  */
 447 int ixgbe_fso(struct ixgbe_ring *tx_ring, struct sk_buff *skb,
 448               u32 tx_flags, u8 *hdr_len)
 449 {
 450         struct fc_frame_header *fh;
 451         u32 vlan_macip_lens;
 452         u32 fcoe_sof_eof = 0;
 453         u32 mss_l4len_idx;
 454         u8 sof, eof;
 455
 456         if (skb_is_gso(skb) && (skb_shinfo(skb)->gso_type != SKB_GSO_FCOE)) {
 457                 dev_err(tx_ring->dev, "Wrong gso type %d:expecting SKB_GSO_FCOE\n",
 458                         skb_shinfo(skb)->gso_type);
 459                 return -EINVAL;
 460         }
 461
 462         /* resets the header to point fcoe/fc */
 463         skb_set_network_header(skb, skb->mac_len);
 464         skb_set_transport_header(skb, skb->mac_len +
 465                                  sizeof(struct fcoe_hdr));
 466
 467         /* sets up SOF and ORIS */
 468         sof = ((struct fcoe_hdr *)skb_network_header(skb))->fcoe_sof;
 469         switch (sof) {
 470         case FC_SOF_I2:
 471                 fcoe_sof_eof = IXGBE_ADVTXD_FCOEF_ORIS;
 472                 break;
 473         case FC_SOF_I3:
 474                 fcoe_sof_eof = IXGBE_ADVTXD_FCOEF_SOF |
 475                                IXGBE_ADVTXD_FCOEF_ORIS;
 476                 break;
 477         case FC_SOF_N2:
 478                 break;
 479         case FC_SOF_N3:
 480                 fcoe_sof_eof = IXGBE_ADVTXD_FCOEF_SOF;
 481                 break;
 482         default:
 483                 dev_warn(tx_ring->dev, "unknown sof = 0x%x\n", sof);
 484                 return -EINVAL;
 485         }
 486
 487         /* the first byte of the last dword is EOF */
 488         skb_copy_bits(skb, skb->len - 4, &eof, 1);
 489         /* sets up EOF and ORIE */
 490         switch (eof) {
 491         case FC_EOF_N:
 492                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_N;
 493                 break;
 494         case FC_EOF_T:
 495                 /* lso needs ORIE */
 496                 if (skb_is_gso(skb))
 497                         fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_N |
 498                                         IXGBE_ADVTXD_FCOEF_ORIE;
 499                 else
 500                         fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_T;
 501                 break;
 502         case FC_EOF_NI:
 503                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_NI;
 504                 break;
 505         case FC_EOF_A:
 506                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_A;
 507                 break;
 508         default:
 509                 dev_warn(tx_ring->dev, "unknown eof = 0x%x\n", eof);
 510                 return -EINVAL;
 511         }
 512
 513         /* sets up PARINC indicating data offset */
 514         fh = (struct fc_frame_header *)skb_transport_header(skb);
 515         if (fh->fh_f_ctl[2] & FC_FC_REL_OFF)
 516                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_PARINC;
 517
 518         /* include trailer in headlen as it is replicated per frame */
 519         *hdr_len = sizeof(struct fcoe_crc_eof);
 520
 521         /* hdr_len includes fc_hdr if FCoE LSO is enabled */
 522         if (skb_is_gso(skb))
 523                 *hdr_len += (skb_transport_offset(skb) +
 524                              sizeof(struct fc_frame_header));
 525
 526         /* mss_l4len_id: use 1 for FSO as TSO, no need for L4LEN */
 527         mss_l4len_idx = skb_shinfo(skb)->gso_size << IXGBE_ADVTXD_MSS_SHIFT;
 528         mss_l4len_idx |= 1 << IXGBE_ADVTXD_IDX_SHIFT;
 529
 530         /* vlan_macip_lens: HEADLEN, MACLEN, VLAN tag */
 531         vlan_macip_lens = skb_transport_offset(skb) +
 532                           sizeof(struct fc_frame_header);
 533         vlan_macip_lens |= (skb_transport_offset(skb) - 4)
 534                            << IXGBE_ADVTXD_MACLEN_SHIFT;
 535         vlan_macip_lens |= tx_flags & IXGBE_TX_FLAGS_VLAN_MASK;
 536
 537         /* write context desc */
 538         ixgbe_tx_ctxtdesc(tx_ring, vlan_macip_lens, fcoe_sof_eof,
 539                           IXGBE_ADVTXT_TUCMD_FCOE, mss_l4len_idx);
 540
 541         return skb_is_gso(skb);
 542 }
 543
 544 static void ixgbe_fcoe_ddp_pools_free(struct ixgbe_fcoe *fcoe)
 545 {
 546         unsigned int cpu;
 547         struct pci_pool **pool;
 548
 549         for_each_possible_cpu(cpu) {
 550                 pool = per_cpu_ptr(fcoe->pool, cpu);
 551                 if (*pool)
 552                         pci_pool_destroy(*pool);
 553         }
 554         free_percpu(fcoe->pool);
 555         fcoe->pool = NULL;
 556 }
 557
 558 static void ixgbe_fcoe_ddp_pools_alloc(struct ixgbe_adapter *adapter)
 559 {
 560         struct ixgbe_fcoe *fcoe = &adapter->fcoe;
 561         unsigned int cpu;
 562         struct pci_pool **pool;
 563         char pool_name[32];
 564
 565         fcoe->pool = alloc_percpu(struct pci_pool *);
 566         if (!fcoe->pool)
 567                 return;
 568
 569         /* allocate pci pool for each cpu */
 570         for_each_possible_cpu(cpu) {
 571                 snprintf(pool_name, 32, "ixgbe_fcoe_ddp_%d", cpu);
 572                 pool = per_cpu_ptr(fcoe->pool, cpu);
 573                 *pool = pci_pool_create(pool_name,
 574                                         adapter->pdev, IXGBE_FCPTR_MAX,
 575                                         IXGBE_FCPTR_ALIGN, PAGE_SIZE);
 576                 if (!*pool) {
 577                         e_err(drv, "failed to alloc DDP pool on cpu:%d\n", cpu);
 578                         ixgbe_fcoe_ddp_pools_free(fcoe);
 579                         return;
 580                 }
 581         }
 582 }
 583
 584 /**
 585  * ixgbe_configure_fcoe - configures registers for fcoe at start
 586  * @adapter: ptr to ixgbe adapter
 587  *
 588  * This sets up FCoE related registers
 589  *
 590  * Returns : none
 591  */
 592 void ixgbe_configure_fcoe(struct ixgbe_adapter *adapter)
 593 {
 594         int i, fcoe_q, fcoe_i;
 595         struct ixgbe_hw *hw = &adapter->hw;
 596         struct ixgbe_fcoe *fcoe = &adapter->fcoe;
 597         struct ixgbe_ring_feature *f = &adapter->ring_feature[RING_F_FCOE];
 598         unsigned int cpu;
 599
 600         if (!fcoe->pool) {
 601                 spin_lock_init(&fcoe->lock);
 602
 603                 ixgbe_fcoe_ddp_pools_alloc(adapter);
 604                 if (!fcoe->pool) {
 605                         e_err(drv, "failed to alloc percpu fcoe DDP pools\n");
 606                         return;
 607                 }
 608
 609                 /* Extra buffer to be shared by all DDPs for HW work around */
 610                 fcoe->extra_ddp_buffer = kmalloc(IXGBE_FCBUFF_MIN, GFP_ATOMIC);
 611                 if (fcoe->extra_ddp_buffer == NULL) {
 612                         e_err(drv, "failed to allocated extra DDP buffer\n");
 613                         goto out_ddp_pools;
 614                 }
 615
 616                 fcoe->extra_ddp_buffer_dma =
 617                         dma_map_single(&adapter->pdev->dev,
 618                                        fcoe->extra_ddp_buffer,
 619                                        IXGBE_FCBUFF_MIN,
 620                                        DMA_FROM_DEVICE);
 621                 if (dma_mapping_error(&adapter->pdev->dev,
 622                                       fcoe->extra_ddp_buffer_dma)) {
 623                         e_err(drv, "failed to map extra DDP buffer\n");
 624                         goto out_extra_ddp_buffer;
 625                 }
 626
 627                 /* Alloc per cpu mem to count the ddp alloc failure number */
 628                 fcoe->pcpu_noddp = alloc_percpu(u64);
 629                 if (!fcoe->pcpu_noddp) {
 630                         e_err(drv, "failed to alloc noddp counter\n");
 631                         goto out_pcpu_noddp_alloc_fail;
 632                 }
 633
 634                 fcoe->pcpu_noddp_ext_buff = alloc_percpu(u64);
 635                 if (!fcoe->pcpu_noddp_ext_buff) {
 636                         e_err(drv, "failed to alloc noddp extra buff cnt\n");
 637                         goto out_pcpu_noddp_extra_buff_alloc_fail;
 638                 }
 639
 640                 for_each_possible_cpu(cpu) {
 641                         *per_cpu_ptr(fcoe->pcpu_noddp, cpu) = 0;
 642                         *per_cpu_ptr(fcoe->pcpu_noddp_ext_buff, cpu) = 0;
 643                 }
 644         }
 645
 646         /* Enable L2 eth type filter for FCoE */
 647         IXGBE_WRITE_REG(hw, IXGBE_ETQF(IXGBE_ETQF_FILTER_FCOE),
 648                         (ETH_P_FCOE | IXGBE_ETQF_FCOE | IXGBE_ETQF_FILTER_EN));
 649         /* Enable L2 eth type filter for FIP */
 650         IXGBE_WRITE_REG(hw, IXGBE_ETQF(IXGBE_ETQF_FILTER_FIP),
 651                         (ETH_P_FIP | IXGBE_ETQF_FILTER_EN));
 652         if (adapter->ring_feature[RING_F_FCOE].indices) {
 653                 /* Use multiple rx queues for FCoE by redirection table */
 654                 for (i = 0; i < IXGBE_FCRETA_SIZE; i++) {
 655                         fcoe_i = f->mask + i % f->indices;
 656                         fcoe_i &= IXGBE_FCRETA_ENTRY_MASK;
 657                         fcoe_q = adapter->rx_ring[fcoe_i]->reg_idx;
 658                         IXGBE_WRITE_REG(hw, IXGBE_FCRETA(i), fcoe_q);
 659                 }
 660                 IXGBE_WRITE_REG(hw, IXGBE_FCRECTL, IXGBE_FCRECTL_ENA);
 661                 IXGBE_WRITE_REG(hw, IXGBE_ETQS(IXGBE_ETQF_FILTER_FCOE), 0);
 662         } else  {
 663                 /* Use single rx queue for FCoE */
 664                 fcoe_i = f->mask;
 665                 fcoe_q = adapter->rx_ring[fcoe_i]->reg_idx;
 666                 IXGBE_WRITE_REG(hw, IXGBE_FCRECTL, 0);
 667                 IXGBE_WRITE_REG(hw, IXGBE_ETQS(IXGBE_ETQF_FILTER_FCOE),
 668                                 IXGBE_ETQS_QUEUE_EN |
 669                                 (fcoe_q << IXGBE_ETQS_RX_QUEUE_SHIFT));
 670         }
 671         /* send FIP frames to the first FCoE queue */
 672         fcoe_i = f->mask;
 673         fcoe_q = adapter->rx_ring[fcoe_i]->reg_idx;
 674         IXGBE_WRITE_REG(hw, IXGBE_ETQS(IXGBE_ETQF_FILTER_FIP),
 675                         IXGBE_ETQS_QUEUE_EN |
 676                         (fcoe_q << IXGBE_ETQS_RX_QUEUE_SHIFT));
 677
 678         IXGBE_WRITE_REG(hw, IXGBE_FCRXCTRL, IXGBE_FCRXCTRL_FCCRCBO |
 679                         (FC_FCOE_VER << IXGBE_FCRXCTRL_FCOEVER_SHIFT));
 680         return;
 681 out_pcpu_noddp_extra_buff_alloc_fail:
 682         free_percpu(fcoe->pcpu_noddp);
 683 out_pcpu_noddp_alloc_fail:
 684         dma_unmap_single(&adapter->pdev->dev,
 685                          fcoe->extra_ddp_buffer_dma,
 686                          IXGBE_FCBUFF_MIN,
 687                          DMA_FROM_DEVICE);
 688 out_extra_ddp_buffer:
 689         kfree(fcoe->extra_ddp_buffer);
 690 out_ddp_pools:
 691         ixgbe_fcoe_ddp_pools_free(fcoe);
 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         if (!fcoe->pool)
 708                 return;
 709
 710         for (i = 0; i < IXGBE_FCOE_DDP_MAX; i++)
 711                 ixgbe_fcoe_ddp_put(adapter->netdev, i);
 712         dma_unmap_single(&adapter->pdev->dev,
 713                          fcoe->extra_ddp_buffer_dma,
 714                          IXGBE_FCBUFF_MIN,
 715                          DMA_FROM_DEVICE);
 716         free_percpu(fcoe->pcpu_noddp);
 717         free_percpu(fcoe->pcpu_noddp_ext_buff);
 718         kfree(fcoe->extra_ddp_buffer);
 719         ixgbe_fcoe_ddp_pools_free(fcoe);
 720 }
 721
 722 /**
 723  * ixgbe_fcoe_enable - turn on FCoE offload feature
 724  * @netdev: the corresponding netdev
 725  *
 726  * Turns on FCoE offload feature in 82599.
 727  *
 728  * Returns : 0 indicates success or -EINVAL on failure
 729  */
 730 int ixgbe_fcoe_enable(struct net_device *netdev)
 731 {
 732         int rc = -EINVAL;
 733         struct ixgbe_adapter *adapter = netdev_priv(netdev);
 734         struct ixgbe_fcoe *fcoe = &adapter->fcoe;
 735
 736
 737         if (!(adapter->flags & IXGBE_FLAG_FCOE_CAPABLE))
 738                 goto out_enable;
 739
 740         atomic_inc(&fcoe->refcnt);
 741         if (adapter->flags & IXGBE_FLAG_FCOE_ENABLED)
 742                 goto out_enable;
 743
 744         e_info(drv, "Enabling FCoE offload features.\n");
 745         if (netif_running(netdev))
 746                 netdev->netdev_ops->ndo_stop(netdev);
 747
 748         ixgbe_clear_interrupt_scheme(adapter);
 749
 750         adapter->flags |= IXGBE_FLAG_FCOE_ENABLED;
 751         adapter->ring_feature[RING_F_FCOE].indices = IXGBE_FCRETA_SIZE;
 752         netdev->features |= NETIF_F_FCOE_CRC;
 753         netdev->features |= NETIF_F_FSO;
 754         netdev->features |= NETIF_F_FCOE_MTU;
 755         netdev->fcoe_ddp_xid = IXGBE_FCOE_DDP_MAX - 1;
 756
 757         ixgbe_init_interrupt_scheme(adapter);
 758         netdev_features_change(netdev);
 759
 760         if (netif_running(netdev))
 761                 netdev->netdev_ops->ndo_open(netdev);
 762         rc = 0;
 763
 764 out_enable:
 765         return rc;
 766 }
 767
 768 /**
 769  * ixgbe_fcoe_disable - turn off FCoE offload feature
 770  * @netdev: the corresponding netdev
 771  *
 772  * Turns off FCoE offload feature in 82599.
 773  *
 774  * Returns : 0 indicates success or -EINVAL on failure
 775  */
 776 int ixgbe_fcoe_disable(struct net_device *netdev)
 777 {
 778         int rc = -EINVAL;
 779         struct ixgbe_adapter *adapter = netdev_priv(netdev);
 780         struct ixgbe_fcoe *fcoe = &adapter->fcoe;
 781
 782         if (!(adapter->flags & IXGBE_FLAG_FCOE_CAPABLE))
 783                 goto out_disable;
 784
 785         if (!(adapter->flags & IXGBE_FLAG_FCOE_ENABLED))
 786                 goto out_disable;
 787
 788         if (!atomic_dec_and_test(&fcoe->refcnt))
 789                 goto out_disable;
 790
 791         e_info(drv, "Disabling FCoE offload features.\n");
 792         netdev->features &= ~NETIF_F_FCOE_CRC;
 793         netdev->features &= ~NETIF_F_FSO;
 794         netdev->features &= ~NETIF_F_FCOE_MTU;
 795         netdev->fcoe_ddp_xid = 0;
 796         netdev_features_change(netdev);
 797
 798         if (netif_running(netdev))
 799                 netdev->netdev_ops->ndo_stop(netdev);
 800
 801         ixgbe_clear_interrupt_scheme(adapter);
 802         adapter->flags &= ~IXGBE_FLAG_FCOE_ENABLED;
 803         adapter->ring_feature[RING_F_FCOE].indices = 0;
 804         ixgbe_cleanup_fcoe(adapter);
 805         ixgbe_init_interrupt_scheme(adapter);
 806
 807         if (netif_running(netdev))
 808                 netdev->netdev_ops->ndo_open(netdev);
 809         rc = 0;
 810
 811 out_disable:
 812         return rc;
 813 }
 814
 815 /**
 816  * ixgbe_fcoe_get_wwn - get world wide name for the node or the port
 817  * @netdev : ixgbe adapter
 818  * @wwn : the world wide name
 819  * @type: the type of world wide name
 820  *
 821  * Returns the node or port world wide name if both the prefix and the san
 822  * mac address are valid, then the wwn is formed based on the NAA-2 for
 823  * IEEE Extended name identifier (ref. to T10 FC-LS Spec., Sec. 15.3).
 824  *
 825  * Returns : 0 on success
 826  */
 827 int ixgbe_fcoe_get_wwn(struct net_device *netdev, u64 *wwn, int type)
 828 {
 829         int rc = -EINVAL;
 830         u16 prefix = 0xffff;
 831         struct ixgbe_adapter *adapter = netdev_priv(netdev);
 832         struct ixgbe_mac_info *mac = &adapter->hw.mac;
 833
 834         switch (type) {
 835         case NETDEV_FCOE_WWNN:
 836                 prefix = mac->wwnn_prefix;
 837                 break;
 838         case NETDEV_FCOE_WWPN:
 839                 prefix = mac->wwpn_prefix;
 840                 break;
 841         default:
 842                 break;
 843         }
 844
 845         if ((prefix != 0xffff) &&
 846             is_valid_ether_addr(mac->san_addr)) {
 847                 *wwn = ((u64) prefix << 48) |
 848                        ((u64) mac->san_addr[0] << 40) |
 849                        ((u64) mac->san_addr[1] << 32) |
 850                        ((u64) mac->san_addr[2] << 24) |
 851                        ((u64) mac->san_addr[3] << 16) |
 852                        ((u64) mac->san_addr[4] << 8)  |
 853                        ((u64) mac->san_addr[5]);
 854                 rc = 0;
 855         }
 856         return rc;
 857 }
 858
 859 /**
 860  * ixgbe_fcoe_get_hbainfo - get FCoE HBA information
 861  * @netdev : ixgbe adapter
 862  * @info : HBA information
 863  *
 864  * Returns ixgbe HBA information
 865  *
 866  * Returns : 0 on success
 867  */
 868 int ixgbe_fcoe_get_hbainfo(struct net_device *netdev,
 869                            struct netdev_fcoe_hbainfo *info)
 870 {
 871         struct ixgbe_adapter *adapter = netdev_priv(netdev);
 872         struct ixgbe_hw *hw = &adapter->hw;
 873         int i, pos;
 874         u8 buf[8];
 875
 876         if (!info)
 877                 return -EINVAL;
 878
 879         /* Don't return information on unsupported devices */
 880         if (hw->mac.type != ixgbe_mac_82599EB &&
 881             hw->mac.type != ixgbe_mac_X540)
 882                 return -EINVAL;
 883
 884         /* Manufacturer */
 885         snprintf(info->manufacturer, sizeof(info->manufacturer),
 886                  "Intel Corporation");
 887
 888         /* Serial Number */
 889
 890         /* Get the PCI-e Device Serial Number Capability */
 891         pos = pci_find_ext_capability(adapter->pdev, PCI_EXT_CAP_ID_DSN);
 892         if (pos) {
 893                 pos += 4;
 894                 for (i = 0; i < 8; i++)
 895                         pci_read_config_byte(adapter->pdev, pos + i, &buf[i]);
 896
 897                 snprintf(info->serial_number, sizeof(info->serial_number),
 898                          "%02X%02X%02X%02X%02X%02X%02X%02X",
 899                          buf[7], buf[6], buf[5], buf[4],
 900                          buf[3], buf[2], buf[1], buf[0]);
 901         } else
 902                 snprintf(info->serial_number, sizeof(info->serial_number),
 903                          "Unknown");
 904
 905         /* Hardware Version */
 906         snprintf(info->hardware_version,
 907                  sizeof(info->hardware_version),
 908                  "Rev %d", hw->revision_id);
 909         /* Driver Name/Version */
 910         snprintf(info->driver_version,
 911                  sizeof(info->driver_version),
 912                  "%s v%s",
 913                  ixgbe_driver_name,
 914                  ixgbe_driver_version);
 915         /* Firmware Version */
 916         snprintf(info->firmware_version,
 917                  sizeof(info->firmware_version),
 918                  "0x%08x",
 919                  (adapter->eeprom_verh << 16) |
 920                   adapter->eeprom_verl);
 921
 922         /* Model */
 923         if (hw->mac.type == ixgbe_mac_82599EB) {
 924                 snprintf(info->model,
 925                          sizeof(info->model),
 926                          "Intel 82599");
 927         } else {
 928                 snprintf(info->model,
 929                          sizeof(info->model),
 930                          "Intel X540");
 931         }
 932
 933         /* Model Description */
 934         snprintf(info->model_description,
 935                  sizeof(info->model_description),
 936                  "%s",
 937                  ixgbe_default_device_descr);
 938
 939         return 0;
 940 }