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

   1 /*******************************************************************************
   2
   3   Intel 10 Gigabit PCI Express Linux driver
   4   Copyright(c) 1999 - 2013 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                 dma_unmap_sg(&adapter->pdev->dev, ddp->sgl, ddp->sgc,
 108                              DMA_FROM_DEVICE);
 109         if (ddp->pool) {
 110                 dma_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 ixgbe_fcoe_ddp_pool *ddp_pool;
 138         struct scatterlist *sg;
 139         unsigned int i, j, dmacount;
 140         unsigned int len;
 141         static const unsigned int bufflen = IXGBE_FCBUFF_MIN;
 142         unsigned int firstoff = 0;
 143         unsigned int lastsize;
 144         unsigned int thisoff = 0;
 145         unsigned int thislen = 0;
 146         u32 fcbuff, fcdmarw, fcfltrw, fcrxctl;
 147         dma_addr_t addr = 0;
 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         ddp = &fcoe->ddp[xid];
 165         if (ddp->sgl) {
 166                 e_err(drv, "xid 0x%x w/ non-null sgl=%p nents=%d\n",
 167                       xid, ddp->sgl, ddp->sgc);
 168                 return 0;
 169         }
 170         ixgbe_fcoe_clear_ddp(ddp);
 171
 172
 173         if (!fcoe->ddp_pool) {
 174                 e_warn(drv, "No ddp_pool resources allocated\n");
 175                 return 0;
 176         }
 177
 178         ddp_pool = per_cpu_ptr(fcoe->ddp_pool, get_cpu());
 179         if (!ddp_pool->pool) {
 180                 e_warn(drv, "xid=0x%x no ddp pool for fcoe\n", xid);
 181                 goto out_noddp;
 182         }
 183
 184         /* setup dma from scsi command sgl */
 185         dmacount = dma_map_sg(&adapter->pdev->dev, sgl, sgc, DMA_FROM_DEVICE);
 186         if (dmacount == 0) {
 187                 e_err(drv, "xid 0x%x DMA map error\n", xid);
 188                 goto out_noddp;
 189         }
 190
 191         /* alloc the udl from per cpu ddp pool */
 192         ddp->udl = dma_pool_alloc(ddp_pool->pool, GFP_ATOMIC, &ddp->udp);
 193         if (!ddp->udl) {
 194                 e_err(drv, "failed allocated ddp context\n");
 195                 goto out_noddp_unmap;
 196         }
 197         ddp->pool = ddp_pool->pool;
 198         ddp->sgl = sgl;
 199         ddp->sgc = sgc;
 200
 201         j = 0;
 202         for_each_sg(sgl, sg, dmacount, i) {
 203                 addr = sg_dma_address(sg);
 204                 len = sg_dma_len(sg);
 205                 while (len) {
 206                         /* max number of buffers allowed in one DDP context */
 207                         if (j >= IXGBE_BUFFCNT_MAX) {
 208                                 ddp_pool->noddp++;
 209                                 goto out_noddp_free;
 210                         }
 211
 212                         /* get the offset of length of current buffer */
 213                         thisoff = addr & ((dma_addr_t)bufflen - 1);
 214                         thislen = min((bufflen - thisoff), len);
 215                         /*
 216                          * all but the 1st buffer (j == 0)
 217                          * must be aligned on bufflen
 218                          */
 219                         if ((j != 0) && (thisoff))
 220                                 goto out_noddp_free;
 221                         /*
 222                          * all but the last buffer
 223                          * ((i == (dmacount - 1)) && (thislen == len))
 224                          * must end at bufflen
 225                          */
 226                         if (((i != (dmacount - 1)) || (thislen != len))
 227                             && ((thislen + thisoff) != bufflen))
 228                                 goto out_noddp_free;
 229
 230                         ddp->udl[j] = (u64)(addr - thisoff);
 231                         /* only the first buffer may have none-zero offset */
 232                         if (j == 0)
 233                                 firstoff = thisoff;
 234                         len -= thislen;
 235                         addr += thislen;
 236                         j++;
 237                 }
 238         }
 239         /* only the last buffer may have non-full bufflen */
 240         lastsize = thisoff + thislen;
 241
 242         /*
 243          * lastsize can not be buffer len.
 244          * If it is then adding another buffer with lastsize = 1.
 245          */
 246         if (lastsize == bufflen) {
 247                 if (j >= IXGBE_BUFFCNT_MAX) {
 248                         ddp_pool->noddp_ext_buff++;
 249                         goto out_noddp_free;
 250                 }
 251
 252                 ddp->udl[j] = (u64)(fcoe->extra_ddp_buffer_dma);
 253                 j++;
 254                 lastsize = 1;
 255         }
 256         put_cpu();
 257
 258         fcbuff = (IXGBE_FCBUFF_4KB << IXGBE_FCBUFF_BUFFSIZE_SHIFT);
 259         fcbuff |= ((j & 0xff) << IXGBE_FCBUFF_BUFFCNT_SHIFT);
 260         fcbuff |= (firstoff << IXGBE_FCBUFF_OFFSET_SHIFT);
 261         /* Set WRCONTX bit to allow DDP for target */
 262         if (target_mode)
 263                 fcbuff |= (IXGBE_FCBUFF_WRCONTX);
 264         fcbuff |= (IXGBE_FCBUFF_VALID);
 265
 266         fcdmarw = xid;
 267         fcdmarw |= IXGBE_FCDMARW_WE;
 268         fcdmarw |= (lastsize << IXGBE_FCDMARW_LASTSIZE_SHIFT);
 269
 270         fcfltrw = xid;
 271         fcfltrw |= IXGBE_FCFLTRW_WE;
 272
 273         /* program DMA context */
 274         hw = &adapter->hw;
 275         spin_lock_bh(&fcoe->lock);
 276
 277         /* turn on last frame indication for target mode as FCP_RSPtarget is
 278          * supposed to send FCP_RSP when it is done. */
 279         if (target_mode && !test_bit(__IXGBE_FCOE_TARGET, &fcoe->mode)) {
 280                 set_bit(__IXGBE_FCOE_TARGET, &fcoe->mode);
 281                 fcrxctl = IXGBE_READ_REG(hw, IXGBE_FCRXCTRL);
 282                 fcrxctl |= IXGBE_FCRXCTRL_LASTSEQH;
 283                 IXGBE_WRITE_REG(hw, IXGBE_FCRXCTRL, fcrxctl);
 284         }
 285
 286         IXGBE_WRITE_REG(hw, IXGBE_FCPTRL, ddp->udp & DMA_BIT_MASK(32));
 287         IXGBE_WRITE_REG(hw, IXGBE_FCPTRH, (u64)ddp->udp >> 32);
 288         IXGBE_WRITE_REG(hw, IXGBE_FCBUFF, fcbuff);
 289         IXGBE_WRITE_REG(hw, IXGBE_FCDMARW, fcdmarw);
 290         /* program filter context */
 291         IXGBE_WRITE_REG(hw, IXGBE_FCPARAM, 0);
 292         IXGBE_WRITE_REG(hw, IXGBE_FCFLT, IXGBE_FCFLT_VALID);
 293         IXGBE_WRITE_REG(hw, IXGBE_FCFLTRW, fcfltrw);
 294
 295         spin_unlock_bh(&fcoe->lock);
 296
 297         return 1;
 298
 299 out_noddp_free:
 300         dma_pool_free(ddp->pool, ddp->udl, ddp->udp);
 301         ixgbe_fcoe_clear_ddp(ddp);
 302
 303 out_noddp_unmap:
 304         dma_unmap_sg(&adapter->pdev->dev, sgl, sgc, DMA_FROM_DEVICE);
 305 out_noddp:
 306         put_cpu();
 307         return 0;
 308 }
 309
 310 /**
 311  * ixgbe_fcoe_ddp_get - called to set up ddp context in initiator mode
 312  * @netdev: the corresponding net_device
 313  * @xid: the exchange id requesting ddp
 314  * @sgl: the scatter-gather list for this request
 315  * @sgc: the number of scatter-gather items
 316  *
 317  * This is the implementation of net_device_ops.ndo_fcoe_ddp_setup
 318  * and is expected to be called from ULD, e.g., FCP layer of libfc
 319  * to set up ddp for the corresponding xid of the given sglist for
 320  * the corresponding I/O.
 321  *
 322  * Returns : 1 for success and 0 for no ddp
 323  */
 324 int ixgbe_fcoe_ddp_get(struct net_device *netdev, u16 xid,
 325                        struct scatterlist *sgl, unsigned int sgc)
 326 {
 327         return ixgbe_fcoe_ddp_setup(netdev, xid, sgl, sgc, 0);
 328 }
 329
 330 /**
 331  * ixgbe_fcoe_ddp_target - called to set up ddp context in target mode
 332  * @netdev: the corresponding net_device
 333  * @xid: the exchange id requesting ddp
 334  * @sgl: the scatter-gather list for this request
 335  * @sgc: the number of scatter-gather items
 336  *
 337  * This is the implementation of net_device_ops.ndo_fcoe_ddp_target
 338  * and is expected to be called from ULD, e.g., FCP layer of libfc
 339  * to set up ddp for the corresponding xid of the given sglist for
 340  * the corresponding I/O. The DDP in target mode is a write I/O request
 341  * from the initiator.
 342  *
 343  * Returns : 1 for success and 0 for no ddp
 344  */
 345 int ixgbe_fcoe_ddp_target(struct net_device *netdev, u16 xid,
 346                             struct scatterlist *sgl, unsigned int sgc)
 347 {
 348         return ixgbe_fcoe_ddp_setup(netdev, xid, sgl, sgc, 1);
 349 }
 350
 351 /**
 352  * ixgbe_fcoe_ddp - check ddp status and mark it done
 353  * @adapter: ixgbe adapter
 354  * @rx_desc: advanced rx descriptor
 355  * @skb: the skb holding the received data
 356  *
 357  * This checks ddp status.
 358  *
 359  * Returns : < 0 indicates an error or not a FCiE ddp, 0 indicates
 360  * not passing the skb to ULD, > 0 indicates is the length of data
 361  * being ddped.
 362  */
 363 int ixgbe_fcoe_ddp(struct ixgbe_adapter *adapter,
 364                    union ixgbe_adv_rx_desc *rx_desc,
 365                    struct sk_buff *skb)
 366 {
 367         int rc = -EINVAL;
 368         struct ixgbe_fcoe *fcoe;
 369         struct ixgbe_fcoe_ddp *ddp;
 370         struct fc_frame_header *fh;
 371         struct fcoe_crc_eof *crc;
 372         __le32 fcerr = ixgbe_test_staterr(rx_desc, IXGBE_RXDADV_ERR_FCERR);
 373         __le32 ddp_err;
 374         u32 fctl;
 375         u16 xid;
 376
 377         if (fcerr == cpu_to_le32(IXGBE_FCERR_BADCRC))
 378                 skb->ip_summed = CHECKSUM_NONE;
 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
 389         fctl = ntoh24(fh->fh_f_ctl);
 390         if (fctl & FC_FC_EX_CTX)
 391                 xid =  be16_to_cpu(fh->fh_ox_id);
 392         else
 393                 xid =  be16_to_cpu(fh->fh_rx_id);
 394
 395         if (xid >= IXGBE_FCOE_DDP_MAX)
 396                 goto ddp_out;
 397
 398         fcoe = &adapter->fcoe;
 399         ddp = &fcoe->ddp[xid];
 400         if (!ddp->udl)
 401                 goto ddp_out;
 402
 403         ddp_err = ixgbe_test_staterr(rx_desc, IXGBE_RXDADV_ERR_FCEOFE |
 404                                               IXGBE_RXDADV_ERR_FCERR);
 405         if (ddp_err)
 406                 goto ddp_out;
 407
 408         switch (ixgbe_test_staterr(rx_desc, IXGBE_RXDADV_STAT_FCSTAT)) {
 409         /* return 0 to bypass going to ULD for DDPed data */
 410         case __constant_cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_DDP):
 411                 /* update length of DDPed data */
 412                 ddp->len = le32_to_cpu(rx_desc->wb.lower.hi_dword.rss);
 413                 rc = 0;
 414                 break;
 415         /* unmap the sg list when FCPRSP is received */
 416         case __constant_cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_FCPRSP):
 417                 dma_unmap_sg(&adapter->pdev->dev, ddp->sgl,
 418                              ddp->sgc, DMA_FROM_DEVICE);
 419                 ddp->err = ddp_err;
 420                 ddp->sgl = NULL;
 421                 ddp->sgc = 0;
 422                 /* fall through */
 423         /* if DDP length is present pass it through to ULD */
 424         case __constant_cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_NODDP):
 425                 /* update length of DDPed data */
 426                 ddp->len = le32_to_cpu(rx_desc->wb.lower.hi_dword.rss);
 427                 if (ddp->len)
 428                         rc = ddp->len;
 429                 break;
 430         /* no match will return as an error */
 431         case __constant_cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_NOMTCH):
 432         default:
 433                 break;
 434         }
 435
 436         /* In target mode, check the last data frame of the sequence.
 437          * For DDP in target mode, data is already DDPed but the header
 438          * indication of the last data frame ould allow is to tell if we
 439          * got all the data and the ULP can send FCP_RSP back, as this is
 440          * not a full fcoe frame, we fill the trailer here so it won't be
 441          * dropped by the ULP stack.
 442          */
 443         if ((fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA) &&
 444             (fctl & FC_FC_END_SEQ)) {
 445                 skb_linearize(skb);
 446                 crc = (struct fcoe_crc_eof *)skb_put(skb, sizeof(*crc));
 447                 crc->fcoe_eof = FC_EOF_T;
 448         }
 449 ddp_out:
 450         return rc;
 451 }
 452
 453 /**
 454  * ixgbe_fso - ixgbe FCoE Sequence Offload (FSO)
 455  * @tx_ring: tx desc ring
 456  * @first: first tx_buffer structure containing skb, tx_flags, and protocol
 457  * @hdr_len: hdr_len to be returned
 458  *
 459  * This sets up large send offload for FCoE
 460  *
 461  * Returns : 0 indicates success, < 0 for error
 462  */
 463 int ixgbe_fso(struct ixgbe_ring *tx_ring,
 464               struct ixgbe_tx_buffer *first,
 465               u8 *hdr_len)
 466 {
 467         struct sk_buff *skb = first->skb;
 468         struct fc_frame_header *fh;
 469         u32 vlan_macip_lens;
 470         u32 fcoe_sof_eof = 0;
 471         u32 mss_l4len_idx;
 472         u8 sof, eof;
 473
 474         if (skb_is_gso(skb) && (skb_shinfo(skb)->gso_type != SKB_GSO_FCOE)) {
 475                 dev_err(tx_ring->dev, "Wrong gso type %d:expecting SKB_GSO_FCOE\n",
 476                         skb_shinfo(skb)->gso_type);
 477                 return -EINVAL;
 478         }
 479
 480         /* resets the header to point fcoe/fc */
 481         skb_set_network_header(skb, skb->mac_len);
 482         skb_set_transport_header(skb, skb->mac_len +
 483                                  sizeof(struct fcoe_hdr));
 484
 485         /* sets up SOF and ORIS */
 486         sof = ((struct fcoe_hdr *)skb_network_header(skb))->fcoe_sof;
 487         switch (sof) {
 488         case FC_SOF_I2:
 489                 fcoe_sof_eof = IXGBE_ADVTXD_FCOEF_ORIS;
 490                 break;
 491         case FC_SOF_I3:
 492                 fcoe_sof_eof = IXGBE_ADVTXD_FCOEF_SOF |
 493                                IXGBE_ADVTXD_FCOEF_ORIS;
 494                 break;
 495         case FC_SOF_N2:
 496                 break;
 497         case FC_SOF_N3:
 498                 fcoe_sof_eof = IXGBE_ADVTXD_FCOEF_SOF;
 499                 break;
 500         default:
 501                 dev_warn(tx_ring->dev, "unknown sof = 0x%x\n", sof);
 502                 return -EINVAL;
 503         }
 504
 505         /* the first byte of the last dword is EOF */
 506         skb_copy_bits(skb, skb->len - 4, &eof, 1);
 507         /* sets up EOF and ORIE */
 508         switch (eof) {
 509         case FC_EOF_N:
 510                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_N;
 511                 break;
 512         case FC_EOF_T:
 513                 /* lso needs ORIE */
 514                 if (skb_is_gso(skb))
 515                         fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_N |
 516                                         IXGBE_ADVTXD_FCOEF_ORIE;
 517                 else
 518                         fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_T;
 519                 break;
 520         case FC_EOF_NI:
 521                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_NI;
 522                 break;
 523         case FC_EOF_A:
 524                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_A;
 525                 break;
 526         default:
 527                 dev_warn(tx_ring->dev, "unknown eof = 0x%x\n", eof);
 528                 return -EINVAL;
 529         }
 530
 531         /* sets up PARINC indicating data offset */
 532         fh = (struct fc_frame_header *)skb_transport_header(skb);
 533         if (fh->fh_f_ctl[2] & FC_FC_REL_OFF)
 534                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_PARINC;
 535
 536         /* include trailer in headlen as it is replicated per frame */
 537         *hdr_len = sizeof(struct fcoe_crc_eof);
 538
 539         /* hdr_len includes fc_hdr if FCoE LSO is enabled */
 540         if (skb_is_gso(skb)) {
 541                 *hdr_len += skb_transport_offset(skb) +
 542                             sizeof(struct fc_frame_header);
 543                 /* update gso_segs and bytecount */
 544                 first->gso_segs = DIV_ROUND_UP(skb->len - *hdr_len,
 545                                                skb_shinfo(skb)->gso_size);
 546                 first->bytecount += (first->gso_segs - 1) * *hdr_len;
 547                 first->tx_flags |= IXGBE_TX_FLAGS_TSO;
 548         }
 549
 550         /* set flag indicating FCOE to ixgbe_tx_map call */
 551         first->tx_flags |= IXGBE_TX_FLAGS_FCOE | IXGBE_TX_FLAGS_CC;
 552
 553         /* mss_l4len_id: use 0 for FSO as TSO, no need for L4LEN */
 554         mss_l4len_idx = skb_shinfo(skb)->gso_size << IXGBE_ADVTXD_MSS_SHIFT;
 555
 556         /* vlan_macip_lens: HEADLEN, MACLEN, VLAN tag */
 557         vlan_macip_lens = skb_transport_offset(skb) +
 558                           sizeof(struct fc_frame_header);
 559         vlan_macip_lens |= (skb_transport_offset(skb) - 4)
 560                            << IXGBE_ADVTXD_MACLEN_SHIFT;
 561         vlan_macip_lens |= first->tx_flags & IXGBE_TX_FLAGS_VLAN_MASK;
 562
 563         /* write context desc */
 564         ixgbe_tx_ctxtdesc(tx_ring, vlan_macip_lens, fcoe_sof_eof,
 565                           IXGBE_ADVTXT_TUCMD_FCOE, mss_l4len_idx);
 566
 567         return 0;
 568 }
 569
 570 static void ixgbe_fcoe_dma_pool_free(struct ixgbe_fcoe *fcoe, unsigned int cpu)
 571 {
 572         struct ixgbe_fcoe_ddp_pool *ddp_pool;
 573
 574         ddp_pool = per_cpu_ptr(fcoe->ddp_pool, cpu);
 575         if (ddp_pool->pool)
 576                 dma_pool_destroy(ddp_pool->pool);
 577         ddp_pool->pool = NULL;
 578 }
 579
 580 static int ixgbe_fcoe_dma_pool_alloc(struct ixgbe_fcoe *fcoe,
 581                                      struct device *dev,
 582                                      unsigned int cpu)
 583 {
 584         struct ixgbe_fcoe_ddp_pool *ddp_pool;
 585         struct dma_pool *pool;
 586         char pool_name[32];
 587
 588         snprintf(pool_name, 32, "ixgbe_fcoe_ddp_%d", cpu);
 589
 590         pool = dma_pool_create(pool_name, dev, IXGBE_FCPTR_MAX,
 591                                IXGBE_FCPTR_ALIGN, PAGE_SIZE);
 592         if (!pool)
 593                 return -ENOMEM;
 594
 595         ddp_pool = per_cpu_ptr(fcoe->ddp_pool, cpu);
 596         ddp_pool->pool = pool;
 597         ddp_pool->noddp = 0;
 598         ddp_pool->noddp_ext_buff = 0;
 599
 600         return 0;
 601 }
 602
 603 /**
 604  * ixgbe_configure_fcoe - configures registers for fcoe at start
 605  * @adapter: ptr to ixgbe adapter
 606  *
 607  * This sets up FCoE related registers
 608  *
 609  * Returns : none
 610  */
 611 void ixgbe_configure_fcoe(struct ixgbe_adapter *adapter)
 612 {
 613         struct ixgbe_ring_feature *fcoe = &adapter->ring_feature[RING_F_FCOE];
 614         struct ixgbe_hw *hw = &adapter->hw;
 615         int i, fcoe_q, fcoe_i;
 616         u32 etqf;
 617
 618         /* Minimal functionality for FCoE requires at least CRC offloads */
 619         if (!(adapter->netdev->features & NETIF_F_FCOE_CRC))
 620                 return;
 621
 622         /* Enable L2 EtherType filter for FCoE, needed for FCoE CRC and DDP */
 623         etqf = ETH_P_FCOE | IXGBE_ETQF_FCOE | IXGBE_ETQF_FILTER_EN;
 624         if (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED) {
 625                 etqf |= IXGBE_ETQF_POOL_ENABLE;
 626                 etqf |= VMDQ_P(0) << IXGBE_ETQF_POOL_SHIFT;
 627         }
 628         IXGBE_WRITE_REG(hw, IXGBE_ETQF(IXGBE_ETQF_FILTER_FCOE), etqf);
 629         IXGBE_WRITE_REG(hw, IXGBE_ETQS(IXGBE_ETQF_FILTER_FCOE), 0);
 630
 631         /* leave registers un-configured if FCoE is disabled */
 632         if (!(adapter->flags & IXGBE_FLAG_FCOE_ENABLED))
 633                 return;
 634
 635         /* Use one or more Rx queues for FCoE by redirection table */
 636         for (i = 0; i < IXGBE_FCRETA_SIZE; i++) {
 637                 fcoe_i = fcoe->offset + (i % fcoe->indices);
 638                 fcoe_i &= IXGBE_FCRETA_ENTRY_MASK;
 639                 fcoe_q = adapter->rx_ring[fcoe_i]->reg_idx;
 640                 IXGBE_WRITE_REG(hw, IXGBE_FCRETA(i), fcoe_q);
 641         }
 642         IXGBE_WRITE_REG(hw, IXGBE_FCRECTL, IXGBE_FCRECTL_ENA);
 643
 644         /* Enable L2 EtherType filter for FIP */
 645         etqf = ETH_P_FIP | IXGBE_ETQF_FILTER_EN;
 646         if (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED) {
 647                 etqf |= IXGBE_ETQF_POOL_ENABLE;
 648                 etqf |= VMDQ_P(0) << IXGBE_ETQF_POOL_SHIFT;
 649         }
 650         IXGBE_WRITE_REG(hw, IXGBE_ETQF(IXGBE_ETQF_FILTER_FIP), etqf);
 651
 652         /* Send FIP frames to the first FCoE queue */
 653         fcoe_q = adapter->rx_ring[fcoe->offset]->reg_idx;
 654         IXGBE_WRITE_REG(hw, IXGBE_ETQS(IXGBE_ETQF_FILTER_FIP),
 655                         IXGBE_ETQS_QUEUE_EN |
 656                         (fcoe_q << IXGBE_ETQS_RX_QUEUE_SHIFT));
 657
 658         /* Configure FCoE Rx control */
 659         IXGBE_WRITE_REG(hw, IXGBE_FCRXCTRL,
 660                         IXGBE_FCRXCTRL_FCCRCBO |
 661                         (FC_FCOE_VER << IXGBE_FCRXCTRL_FCOEVER_SHIFT));
 662 }
 663
 664 /**
 665  * ixgbe_free_fcoe_ddp_resources - release all fcoe ddp context resources
 666  * @adapter : ixgbe adapter
 667  *
 668  * Cleans up outstanding ddp context resources
 669  *
 670  * Returns : none
 671  */
 672 void ixgbe_free_fcoe_ddp_resources(struct ixgbe_adapter *adapter)
 673 {
 674         struct ixgbe_fcoe *fcoe = &adapter->fcoe;
 675         int cpu, i;
 676
 677         /* do nothing if no DDP pools were allocated */
 678         if (!fcoe->ddp_pool)
 679                 return;
 680
 681         for (i = 0; i < IXGBE_FCOE_DDP_MAX; i++)
 682                 ixgbe_fcoe_ddp_put(adapter->netdev, i);
 683
 684         for_each_possible_cpu(cpu)
 685                 ixgbe_fcoe_dma_pool_free(fcoe, cpu);
 686
 687         dma_unmap_single(&adapter->pdev->dev,
 688                          fcoe->extra_ddp_buffer_dma,
 689                          IXGBE_FCBUFF_MIN,
 690                          DMA_FROM_DEVICE);
 691         kfree(fcoe->extra_ddp_buffer);
 692
 693         fcoe->extra_ddp_buffer = NULL;
 694         fcoe->extra_ddp_buffer_dma = 0;
 695 }
 696
 697 /**
 698  * ixgbe_setup_fcoe_ddp_resources - setup all fcoe ddp context resources
 699  * @adapter: ixgbe adapter
 700  *
 701  * Sets up ddp context resouces
 702  *
 703  * Returns : 0 indicates success or -EINVAL on failure
 704  */
 705 int ixgbe_setup_fcoe_ddp_resources(struct ixgbe_adapter *adapter)
 706 {
 707         struct ixgbe_fcoe *fcoe = &adapter->fcoe;
 708         struct device *dev = &adapter->pdev->dev;
 709         void *buffer;
 710         dma_addr_t dma;
 711         unsigned int cpu;
 712
 713         /* do nothing if no DDP pools were allocated */
 714         if (!fcoe->ddp_pool)
 715                 return 0;
 716
 717         /* Extra buffer to be shared by all DDPs for HW work around */
 718         buffer = kmalloc(IXGBE_FCBUFF_MIN, GFP_ATOMIC);
 719         if (!buffer)
 720                 return -ENOMEM;
 721
 722         dma = dma_map_single(dev, buffer, IXGBE_FCBUFF_MIN, DMA_FROM_DEVICE);
 723         if (dma_mapping_error(dev, dma)) {
 724                 e_err(drv, "failed to map extra DDP buffer\n");
 725                 kfree(buffer);
 726                 return -ENOMEM;
 727         }
 728
 729         fcoe->extra_ddp_buffer = buffer;
 730         fcoe->extra_ddp_buffer_dma = dma;
 731
 732         /* allocate pci pool for each cpu */
 733         for_each_possible_cpu(cpu) {
 734                 int err = ixgbe_fcoe_dma_pool_alloc(fcoe, dev, cpu);
 735                 if (!err)
 736                         continue;
 737
 738                 e_err(drv, "failed to alloc DDP pool on cpu:%d\n", cpu);
 739                 ixgbe_free_fcoe_ddp_resources(adapter);
 740                 return -ENOMEM;
 741         }
 742
 743         return 0;
 744 }
 745
 746 static int ixgbe_fcoe_ddp_enable(struct ixgbe_adapter *adapter)
 747 {
 748         struct ixgbe_fcoe *fcoe = &adapter->fcoe;
 749
 750         if (!(adapter->flags & IXGBE_FLAG_FCOE_CAPABLE))
 751                 return -EINVAL;
 752
 753         fcoe->ddp_pool = alloc_percpu(struct ixgbe_fcoe_ddp_pool);
 754
 755         if (!fcoe->ddp_pool) {
 756                 e_err(drv, "failed to allocate percpu DDP resources\n");
 757                 return -ENOMEM;
 758         }
 759
 760         adapter->netdev->fcoe_ddp_xid = IXGBE_FCOE_DDP_MAX - 1;
 761
 762         return 0;
 763 }
 764
 765 static void ixgbe_fcoe_ddp_disable(struct ixgbe_adapter *adapter)
 766 {
 767         struct ixgbe_fcoe *fcoe = &adapter->fcoe;
 768
 769         adapter->netdev->fcoe_ddp_xid = 0;
 770
 771         if (!fcoe->ddp_pool)
 772                 return;
 773
 774         free_percpu(fcoe->ddp_pool);
 775         fcoe->ddp_pool = NULL;
 776 }
 777
 778 /**
 779  * ixgbe_fcoe_enable - turn on FCoE offload feature
 780  * @netdev: the corresponding netdev
 781  *
 782  * Turns on FCoE offload feature in 82599.
 783  *
 784  * Returns : 0 indicates success or -EINVAL on failure
 785  */
 786 int ixgbe_fcoe_enable(struct net_device *netdev)
 787 {
 788         struct ixgbe_adapter *adapter = netdev_priv(netdev);
 789         struct ixgbe_fcoe *fcoe = &adapter->fcoe;
 790
 791         atomic_inc(&fcoe->refcnt);
 792
 793         if (!(adapter->flags & IXGBE_FLAG_FCOE_CAPABLE))
 794                 return -EINVAL;
 795
 796         if (adapter->flags & IXGBE_FLAG_FCOE_ENABLED)
 797                 return -EINVAL;
 798
 799         e_info(drv, "Enabling FCoE offload features.\n");
 800
 801         if (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED)
 802                 e_warn(probe, "Enabling FCoE on PF will disable legacy VFs\n");
 803
 804         if (netif_running(netdev))
 805                 netdev->netdev_ops->ndo_stop(netdev);
 806
 807         /* Allocate per CPU memory to track DDP pools */
 808         ixgbe_fcoe_ddp_enable(adapter);
 809
 810         /* enable FCoE and notify stack */
 811         adapter->flags |= IXGBE_FLAG_FCOE_ENABLED;
 812         netdev->features |= NETIF_F_FCOE_MTU;
 813         netdev_features_change(netdev);
 814
 815         /* release existing queues and reallocate them */
 816         ixgbe_clear_interrupt_scheme(adapter);
 817         ixgbe_init_interrupt_scheme(adapter);
 818
 819         if (netif_running(netdev))
 820                 netdev->netdev_ops->ndo_open(netdev);
 821
 822         return 0;
 823 }
 824
 825 /**
 826  * ixgbe_fcoe_disable - turn off FCoE offload feature
 827  * @netdev: the corresponding netdev
 828  *
 829  * Turns off FCoE offload feature in 82599.
 830  *
 831  * Returns : 0 indicates success or -EINVAL on failure
 832  */
 833 int ixgbe_fcoe_disable(struct net_device *netdev)
 834 {
 835         struct ixgbe_adapter *adapter = netdev_priv(netdev);
 836
 837         if (!atomic_dec_and_test(&adapter->fcoe.refcnt))
 838                 return -EINVAL;
 839
 840         if (!(adapter->flags & IXGBE_FLAG_FCOE_ENABLED))
 841                 return -EINVAL;
 842
 843         e_info(drv, "Disabling FCoE offload features.\n");
 844         if (netif_running(netdev))
 845                 netdev->netdev_ops->ndo_stop(netdev);
 846
 847         /* Free per CPU memory to track DDP pools */
 848         ixgbe_fcoe_ddp_disable(adapter);
 849
 850         /* disable FCoE and notify stack */
 851         adapter->flags &= ~IXGBE_FLAG_FCOE_ENABLED;
 852         netdev->features &= ~NETIF_F_FCOE_MTU;
 853
 854         netdev_features_change(netdev);
 855
 856         /* release existing queues and reallocate them */
 857         ixgbe_clear_interrupt_scheme(adapter);
 858         ixgbe_init_interrupt_scheme(adapter);
 859
 860         if (netif_running(netdev))
 861                 netdev->netdev_ops->ndo_open(netdev);
 862
 863         return 0;
 864 }
 865
 866 /**
 867  * ixgbe_fcoe_get_wwn - get world wide name for the node or the port
 868  * @netdev : ixgbe adapter
 869  * @wwn : the world wide name
 870  * @type: the type of world wide name
 871  *
 872  * Returns the node or port world wide name if both the prefix and the san
 873  * mac address are valid, then the wwn is formed based on the NAA-2 for
 874  * IEEE Extended name identifier (ref. to T10 FC-LS Spec., Sec. 15.3).
 875  *
 876  * Returns : 0 on success
 877  */
 878 int ixgbe_fcoe_get_wwn(struct net_device *netdev, u64 *wwn, int type)
 879 {
 880         int rc = -EINVAL;
 881         u16 prefix = 0xffff;
 882         struct ixgbe_adapter *adapter = netdev_priv(netdev);
 883         struct ixgbe_mac_info *mac = &adapter->hw.mac;
 884
 885         switch (type) {
 886         case NETDEV_FCOE_WWNN:
 887                 prefix = mac->wwnn_prefix;
 888                 break;
 889         case NETDEV_FCOE_WWPN:
 890                 prefix = mac->wwpn_prefix;
 891                 break;
 892         default:
 893                 break;
 894         }
 895
 896         if ((prefix != 0xffff) &&
 897             is_valid_ether_addr(mac->san_addr)) {
 898                 *wwn = ((u64) prefix << 48) |
 899                        ((u64) mac->san_addr[0] << 40) |
 900                        ((u64) mac->san_addr[1] << 32) |
 901                        ((u64) mac->san_addr[2] << 24) |
 902                        ((u64) mac->san_addr[3] << 16) |
 903                        ((u64) mac->san_addr[4] << 8)  |
 904                        ((u64) mac->san_addr[5]);
 905                 rc = 0;
 906         }
 907         return rc;
 908 }
 909
 910 /**
 911  * ixgbe_fcoe_get_hbainfo - get FCoE HBA information
 912  * @netdev : ixgbe adapter
 913  * @info : HBA information
 914  *
 915  * Returns ixgbe HBA information
 916  *
 917  * Returns : 0 on success
 918  */
 919 int ixgbe_fcoe_get_hbainfo(struct net_device *netdev,
 920                            struct netdev_fcoe_hbainfo *info)
 921 {
 922         struct ixgbe_adapter *adapter = netdev_priv(netdev);
 923         struct ixgbe_hw *hw = &adapter->hw;
 924         int i, pos;
 925         u8 buf[8];
 926
 927         if (!info)
 928                 return -EINVAL;
 929
 930         /* Don't return information on unsupported devices */
 931         if (hw->mac.type != ixgbe_mac_82599EB &&
 932             hw->mac.type != ixgbe_mac_X540)
 933                 return -EINVAL;
 934
 935         /* Manufacturer */
 936         snprintf(info->manufacturer, sizeof(info->manufacturer),
 937                  "Intel Corporation");
 938
 939         /* Serial Number */
 940
 941         /* Get the PCI-e Device Serial Number Capability */
 942         pos = pci_find_ext_capability(adapter->pdev, PCI_EXT_CAP_ID_DSN);
 943         if (pos) {
 944                 pos += 4;
 945                 for (i = 0; i < 8; i++)
 946                         pci_read_config_byte(adapter->pdev, pos + i, &buf[i]);
 947
 948                 snprintf(info->serial_number, sizeof(info->serial_number),
 949                          "%02X%02X%02X%02X%02X%02X%02X%02X",
 950                          buf[7], buf[6], buf[5], buf[4],
 951                          buf[3], buf[2], buf[1], buf[0]);
 952         } else
 953                 snprintf(info->serial_number, sizeof(info->serial_number),
 954                          "Unknown");
 955
 956         /* Hardware Version */
 957         snprintf(info->hardware_version,
 958                  sizeof(info->hardware_version),
 959                  "Rev %d", hw->revision_id);
 960         /* Driver Name/Version */
 961         snprintf(info->driver_version,
 962                  sizeof(info->driver_version),
 963                  "%s v%s",
 964                  ixgbe_driver_name,
 965                  ixgbe_driver_version);
 966         /* Firmware Version */
 967         snprintf(info->firmware_version,
 968                  sizeof(info->firmware_version),
 969                  "0x%08x",
 970                  (adapter->eeprom_verh << 16) |
 971                   adapter->eeprom_verl);
 972
 973         /* Model */
 974         if (hw->mac.type == ixgbe_mac_82599EB) {
 975                 snprintf(info->model,
 976                          sizeof(info->model),
 977                          "Intel 82599");
 978         } else {
 979                 snprintf(info->model,
 980                          sizeof(info->model),
 981                          "Intel X540");
 982         }
 983
 984         /* Model Description */
 985         snprintf(info->model_description,
 986                  sizeof(info->model_description),
 987                  "%s",
 988                  ixgbe_default_device_descr);
 989
 990         return 0;
 991 }
 992
 993 /**
 994  * ixgbe_fcoe_get_tc - get the current TC that fcoe is mapped to
 995  * @adapter - pointer to the device adapter structure
 996  *
 997  * Return : TC that FCoE is mapped to
 998  */
 999 u8 ixgbe_fcoe_get_tc(struct ixgbe_adapter *adapter)
1000 {
1001 #ifdef CONFIG_IXGBE_DCB
1002         return netdev_get_prio_tc_map(adapter->netdev, adapter->fcoe.up);
1003 #else
1004         return 0;
1005 #endif
1006 }