drivers/net/ixgbe/ixgbe_fcoe.c

   1 /*******************************************************************************
   2
   3   Intel 10 Gigabit PCI Express Linux driver
   4   Copyright(c) 1999 - 2010 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
  29 #include "ixgbe.h"
  30 #ifdef CONFIG_IXGBE_DCB
  31 #include "ixgbe_dcb_82599.h"
  32 #endif /* CONFIG_IXGBE_DCB */
  33 #include <linux/if_ether.h>
  34 #include <linux/gfp.h>
  35 #include <linux/if_vlan.h>
  36 #include <scsi/scsi_cmnd.h>
  37 #include <scsi/scsi_device.h>
  38 #include <scsi/fc/fc_fs.h>
  39 #include <scsi/fc/fc_fcoe.h>
  40 #include <scsi/libfc.h>
  41 #include <scsi/libfcoe.h>
  42
  43 /**
  44  * ixgbe_rx_is_fcoe - check the rx desc for incoming pkt type
  45  * @rx_desc: advanced rx descriptor
  46  *
  47  * Returns : true if it is FCoE pkt
  48  */
  49 static inline bool ixgbe_rx_is_fcoe(union ixgbe_adv_rx_desc *rx_desc)
  50 {
  51         u16 p;
  52
  53         p = le16_to_cpu(rx_desc->wb.lower.lo_dword.hs_rss.pkt_info);
  54         if (p & IXGBE_RXDADV_PKTTYPE_ETQF) {
  55                 p &= IXGBE_RXDADV_PKTTYPE_ETQF_MASK;
  56                 p >>= IXGBE_RXDADV_PKTTYPE_ETQF_SHIFT;
  57                 return p == IXGBE_ETQF_FILTER_FCOE;
  58         }
  59         return false;
  60 }
  61
  62 /**
  63  * ixgbe_fcoe_clear_ddp - clear the given ddp context
  64  * @ddp - ptr to the ixgbe_fcoe_ddp
  65  *
  66  * Returns : none
  67  *
  68  */
  69 static inline void ixgbe_fcoe_clear_ddp(struct ixgbe_fcoe_ddp *ddp)
  70 {
  71         ddp->len = 0;
  72         ddp->err = 0;
  73         ddp->udl = NULL;
  74         ddp->udp = 0UL;
  75         ddp->sgl = NULL;
  76         ddp->sgc = 0;
  77 }
  78
  79 /**
  80  * ixgbe_fcoe_ddp_put - free the ddp context for a given xid
  81  * @netdev: the corresponding net_device
  82  * @xid: the xid that corresponding ddp will be freed
  83  *
  84  * This is the implementation of net_device_ops.ndo_fcoe_ddp_done
  85  * and it is expected to be called by ULD, i.e., FCP layer of libfc
  86  * to release the corresponding ddp context when the I/O is done.
  87  *
  88  * Returns : data length already ddp-ed in bytes
  89  */
  90 int ixgbe_fcoe_ddp_put(struct net_device *netdev, u16 xid)
  91 {
  92         int len = 0;
  93         struct ixgbe_fcoe *fcoe;
  94         struct ixgbe_adapter *adapter;
  95         struct ixgbe_fcoe_ddp *ddp;
  96
  97         if (!netdev)
  98                 goto out_ddp_put;
  99
 100         if (xid >= IXGBE_FCOE_DDP_MAX)
 101                 goto out_ddp_put;
 102
 103         adapter = netdev_priv(netdev);
 104         fcoe = &adapter->fcoe;
 105         ddp = &fcoe->ddp[xid];
 106         if (!ddp->udl)
 107                 goto out_ddp_put;
 108
 109         len = ddp->len;
 110         /* if there an error, force to invalidate ddp context */
 111         if (ddp->err) {
 112                 spin_lock_bh(&fcoe->lock);
 113                 IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCFLT, 0);
 114                 IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCFLTRW,
 115                                 (xid | IXGBE_FCFLTRW_WE));
 116                 IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCBUFF, 0);
 117                 IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCDMARW,
 118                                 (xid | IXGBE_FCDMARW_WE));
 119                 spin_unlock_bh(&fcoe->lock);
 120         }
 121         if (ddp->sgl)
 122                 pci_unmap_sg(adapter->pdev, ddp->sgl, ddp->sgc,
 123                              DMA_FROM_DEVICE);
 124         pci_pool_free(fcoe->pool, ddp->udl, ddp->udp);
 125         ixgbe_fcoe_clear_ddp(ddp);
 126
 127 out_ddp_put:
 128         return len;
 129 }
 130
 131 /**
 132  * ixgbe_fcoe_ddp_get - called to set up ddp context
 133  * @netdev: the corresponding net_device
 134  * @xid: the exchange id requesting ddp
 135  * @sgl: the scatter-gather list for this request
 136  * @sgc: the number of scatter-gather items
 137  *
 138  * This is the implementation of net_device_ops.ndo_fcoe_ddp_setup
 139  * and is expected to be called from ULD, e.g., FCP layer of libfc
 140  * to set up ddp for the corresponding xid of the given sglist for
 141  * the corresponding I/O.
 142  *
 143  * Returns : 1 for success and 0 for no ddp
 144  */
 145 int ixgbe_fcoe_ddp_get(struct net_device *netdev, u16 xid,
 146                        struct scatterlist *sgl, unsigned int sgc)
 147 {
 148         struct ixgbe_adapter *adapter;
 149         struct ixgbe_hw *hw;
 150         struct ixgbe_fcoe *fcoe;
 151         struct ixgbe_fcoe_ddp *ddp;
 152         struct scatterlist *sg;
 153         unsigned int i, j, dmacount;
 154         unsigned int len;
 155         static const unsigned int bufflen = 4096;
 156         unsigned int firstoff = 0;
 157         unsigned int lastsize;
 158         unsigned int thisoff = 0;
 159         unsigned int thislen = 0;
 160         u32 fcbuff, fcdmarw, fcfltrw;
 161         dma_addr_t addr;
 162
 163         if (!netdev || !sgl)
 164                 return 0;
 165
 166         adapter = netdev_priv(netdev);
 167         if (xid >= IXGBE_FCOE_DDP_MAX) {
 168                 DPRINTK(DRV, WARNING, "xid=0x%x out-of-range\n", xid);
 169                 return 0;
 170         }
 171
 172         fcoe = &adapter->fcoe;
 173         if (!fcoe->pool) {
 174                 DPRINTK(DRV, WARNING, "xid=0x%x no ddp pool for fcoe\n", xid);
 175                 return 0;
 176         }
 177
 178         ddp = &fcoe->ddp[xid];
 179         if (ddp->sgl) {
 180                 DPRINTK(DRV, ERR, "xid 0x%x w/ non-null sgl=%p nents=%d\n",
 181                         xid, ddp->sgl, ddp->sgc);
 182                 return 0;
 183         }
 184         ixgbe_fcoe_clear_ddp(ddp);
 185
 186         /* setup dma from scsi command sgl */
 187         dmacount = pci_map_sg(adapter->pdev, sgl, sgc, DMA_FROM_DEVICE);
 188         if (dmacount == 0) {
 189                 DPRINTK(DRV, ERR, "xid 0x%x DMA map error\n", xid);
 190                 return 0;
 191         }
 192
 193         /* alloc the udl from our ddp pool */
 194         ddp->udl = pci_pool_alloc(fcoe->pool, GFP_KERNEL, &ddp->udp);
 195         if (!ddp->udl) {
 196                 DPRINTK(DRV, ERR, "failed allocated ddp context\n");
 197                 goto out_noddp_unmap;
 198         }
 199         ddp->sgl = sgl;
 200         ddp->sgc = sgc;
 201
 202         j = 0;
 203         for_each_sg(sgl, sg, dmacount, i) {
 204                 addr = sg_dma_address(sg);
 205                 len = sg_dma_len(sg);
 206                 while (len) {
 207                         /* max number of buffers allowed in one DDP context */
 208                         if (j >= IXGBE_BUFFCNT_MAX) {
 209                                 netif_err(adapter, drv, adapter->netdev,
 210                                           "xid=%x:%d,%d,%d:addr=%llx "
 211                                           "not enough descriptors\n",
 212                                           xid, i, j, dmacount, (u64)addr);
 213                                 goto out_noddp_free;
 214                         }
 215
 216                         /* get the offset of length of current buffer */
 217                         thisoff = addr & ((dma_addr_t)bufflen - 1);
 218                         thislen = min((bufflen - thisoff), len);
 219                         /*
 220                          * all but the 1st buffer (j == 0)
 221                          * must be aligned on bufflen
 222                          */
 223                         if ((j != 0) && (thisoff))
 224                                 goto out_noddp_free;
 225                         /*
 226                          * all but the last buffer
 227                          * ((i == (dmacount - 1)) && (thislen == len))
 228                          * must end at bufflen
 229                          */
 230                         if (((i != (dmacount - 1)) || (thislen != len))
 231                             && ((thislen + thisoff) != bufflen))
 232                                 goto out_noddp_free;
 233
 234                         ddp->udl[j] = (u64)(addr - thisoff);
 235                         /* only the first buffer may have none-zero offset */
 236                         if (j == 0)
 237                                 firstoff = thisoff;
 238                         len -= thislen;
 239                         addr += thislen;
 240                         j++;
 241                 }
 242         }
 243         /* only the last buffer may have non-full bufflen */
 244         lastsize = thisoff + thislen;
 245
 246         fcbuff = (IXGBE_FCBUFF_4KB << IXGBE_FCBUFF_BUFFSIZE_SHIFT);
 247         fcbuff |= ((j & 0xff) << IXGBE_FCBUFF_BUFFCNT_SHIFT);
 248         fcbuff |= (firstoff << IXGBE_FCBUFF_OFFSET_SHIFT);
 249         fcbuff |= (IXGBE_FCBUFF_VALID);
 250
 251         fcdmarw = xid;
 252         fcdmarw |= IXGBE_FCDMARW_WE;
 253         fcdmarw |= (lastsize << IXGBE_FCDMARW_LASTSIZE_SHIFT);
 254
 255         fcfltrw = xid;
 256         fcfltrw |= IXGBE_FCFLTRW_WE;
 257
 258         /* program DMA context */
 259         hw = &adapter->hw;
 260         spin_lock_bh(&fcoe->lock);
 261         IXGBE_WRITE_REG(hw, IXGBE_FCPTRL, ddp->udp & DMA_BIT_MASK(32));
 262         IXGBE_WRITE_REG(hw, IXGBE_FCPTRH, (u64)ddp->udp >> 32);
 263         IXGBE_WRITE_REG(hw, IXGBE_FCBUFF, fcbuff);
 264         IXGBE_WRITE_REG(hw, IXGBE_FCDMARW, fcdmarw);
 265         /* program filter context */
 266         IXGBE_WRITE_REG(hw, IXGBE_FCPARAM, 0);
 267         IXGBE_WRITE_REG(hw, IXGBE_FCFLT, IXGBE_FCFLT_VALID);
 268         IXGBE_WRITE_REG(hw, IXGBE_FCFLTRW, fcfltrw);
 269         spin_unlock_bh(&fcoe->lock);
 270
 271         return 1;
 272
 273 out_noddp_free:
 274         pci_pool_free(fcoe->pool, ddp->udl, ddp->udp);
 275         ixgbe_fcoe_clear_ddp(ddp);
 276
 277 out_noddp_unmap:
 278         pci_unmap_sg(adapter->pdev, sgl, sgc, DMA_FROM_DEVICE);
 279         return 0;
 280 }
 281
 282 /**
 283  * ixgbe_fcoe_ddp - check ddp status and mark it done
 284  * @adapter: ixgbe adapter
 285  * @rx_desc: advanced rx descriptor
 286  * @skb: the skb holding the received data
 287  *
 288  * This checks ddp status.
 289  *
 290  * Returns : < 0 indicates an error or not a FCiE ddp, 0 indicates
 291  * not passing the skb to ULD, > 0 indicates is the length of data
 292  * being ddped.
 293  */
 294 int ixgbe_fcoe_ddp(struct ixgbe_adapter *adapter,
 295                    union ixgbe_adv_rx_desc *rx_desc,
 296                    struct sk_buff *skb)
 297 {
 298         u16 xid;
 299         u32 fctl;
 300         u32 sterr, fceofe, fcerr, fcstat;
 301         int rc = -EINVAL;
 302         struct ixgbe_fcoe *fcoe;
 303         struct ixgbe_fcoe_ddp *ddp;
 304         struct fc_frame_header *fh;
 305
 306         if (!ixgbe_rx_is_fcoe(rx_desc))
 307                 goto ddp_out;
 308
 309         skb->ip_summed = CHECKSUM_UNNECESSARY;
 310         sterr = le32_to_cpu(rx_desc->wb.upper.status_error);
 311         fcerr = (sterr & IXGBE_RXDADV_ERR_FCERR);
 312         fceofe = (sterr & IXGBE_RXDADV_ERR_FCEOFE);
 313         if (fcerr == IXGBE_FCERR_BADCRC)
 314                 skb->ip_summed = CHECKSUM_NONE;
 315
 316         if (eth_hdr(skb)->h_proto == htons(ETH_P_8021Q))
 317                 fh = (struct fc_frame_header *)(skb->data +
 318                         sizeof(struct vlan_hdr) + sizeof(struct fcoe_hdr));
 319         else
 320                 fh = (struct fc_frame_header *)(skb->data +
 321                         sizeof(struct fcoe_hdr));
 322         fctl = ntoh24(fh->fh_f_ctl);
 323         if (fctl & FC_FC_EX_CTX)
 324                 xid =  be16_to_cpu(fh->fh_ox_id);
 325         else
 326                 xid =  be16_to_cpu(fh->fh_rx_id);
 327
 328         if (xid >= IXGBE_FCOE_DDP_MAX)
 329                 goto ddp_out;
 330
 331         fcoe = &adapter->fcoe;
 332         ddp = &fcoe->ddp[xid];
 333         if (!ddp->udl)
 334                 goto ddp_out;
 335
 336         ddp->err = (fcerr | fceofe);
 337         if (ddp->err)
 338                 goto ddp_out;
 339
 340         fcstat = (sterr & IXGBE_RXDADV_STAT_FCSTAT);
 341         if (fcstat) {
 342                 /* update length of DDPed data */
 343                 ddp->len = le32_to_cpu(rx_desc->wb.lower.hi_dword.rss);
 344                 /* unmap the sg list when FCP_RSP is received */
 345                 if (fcstat == IXGBE_RXDADV_STAT_FCSTAT_FCPRSP) {
 346                         pci_unmap_sg(adapter->pdev, ddp->sgl,
 347                                      ddp->sgc, DMA_FROM_DEVICE);
 348                         ddp->sgl = NULL;
 349                         ddp->sgc = 0;
 350                 }
 351                 /* return 0 to bypass going to ULD for DDPed data */
 352                 if (fcstat == IXGBE_RXDADV_STAT_FCSTAT_DDP)
 353                         rc = 0;
 354                 else if (ddp->len)
 355                         rc = ddp->len;
 356         }
 357
 358 ddp_out:
 359         return rc;
 360 }
 361
 362 /**
 363  * ixgbe_fso - ixgbe FCoE Sequence Offload (FSO)
 364  * @adapter: ixgbe adapter
 365  * @tx_ring: tx desc ring
 366  * @skb: associated skb
 367  * @tx_flags: tx flags
 368  * @hdr_len: hdr_len to be returned
 369  *
 370  * This sets up large send offload for FCoE
 371  *
 372  * Returns : 0 indicates no FSO, > 0 for FSO, < 0 for error
 373  */
 374 int ixgbe_fso(struct ixgbe_adapter *adapter,
 375               struct ixgbe_ring *tx_ring, struct sk_buff *skb,
 376               u32 tx_flags, u8 *hdr_len)
 377 {
 378         u8 sof, eof;
 379         u32 vlan_macip_lens;
 380         u32 fcoe_sof_eof;
 381         u32 type_tucmd;
 382         u32 mss_l4len_idx;
 383         int mss = 0;
 384         unsigned int i;
 385         struct ixgbe_tx_buffer *tx_buffer_info;
 386         struct ixgbe_adv_tx_context_desc *context_desc;
 387         struct fc_frame_header *fh;
 388
 389         if (skb_is_gso(skb) && (skb_shinfo(skb)->gso_type != SKB_GSO_FCOE)) {
 390                 DPRINTK(DRV, ERR, "Wrong gso type %d:expecting SKB_GSO_FCOE\n",
 391                         skb_shinfo(skb)->gso_type);
 392                 return -EINVAL;
 393         }
 394
 395         /* resets the header to point fcoe/fc */
 396         skb_set_network_header(skb, skb->mac_len);
 397         skb_set_transport_header(skb, skb->mac_len +
 398                                  sizeof(struct fcoe_hdr));
 399
 400         /* sets up SOF and ORIS */
 401         fcoe_sof_eof = 0;
 402         sof = ((struct fcoe_hdr *)skb_network_header(skb))->fcoe_sof;
 403         switch (sof) {
 404         case FC_SOF_I2:
 405                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_ORIS;
 406                 break;
 407         case FC_SOF_I3:
 408                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_SOF;
 409                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_ORIS;
 410                 break;
 411         case FC_SOF_N2:
 412                 break;
 413         case FC_SOF_N3:
 414                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_SOF;
 415                 break;
 416         default:
 417                 DPRINTK(DRV, WARNING, "unknown sof = 0x%x\n", sof);
 418                 return -EINVAL;
 419         }
 420
 421         /* the first byte of the last dword is EOF */
 422         skb_copy_bits(skb, skb->len - 4, &eof, 1);
 423         /* sets up EOF and ORIE */
 424         switch (eof) {
 425         case FC_EOF_N:
 426                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_N;
 427                 break;
 428         case FC_EOF_T:
 429                 /* lso needs ORIE */
 430                 if (skb_is_gso(skb)) {
 431                         fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_N;
 432                         fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_ORIE;
 433                 } else {
 434                         fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_T;
 435                 }
 436                 break;
 437         case FC_EOF_NI:
 438                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_NI;
 439                 break;
 440         case FC_EOF_A:
 441                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_A;
 442                 break;
 443         default:
 444                 DPRINTK(DRV, WARNING, "unknown eof = 0x%x\n", eof);
 445                 return -EINVAL;
 446         }
 447
 448         /* sets up PARINC indicating data offset */
 449         fh = (struct fc_frame_header *)skb_transport_header(skb);
 450         if (fh->fh_f_ctl[2] & FC_FC_REL_OFF)
 451                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_PARINC;
 452
 453         /* hdr_len includes fc_hdr if FCoE lso is enabled */
 454         *hdr_len = sizeof(struct fcoe_crc_eof);
 455         if (skb_is_gso(skb))
 456                 *hdr_len += (skb_transport_offset(skb) +
 457                              sizeof(struct fc_frame_header));
 458         /* vlan_macip_lens: HEADLEN, MACLEN, VLAN tag */
 459         vlan_macip_lens = (skb_transport_offset(skb) +
 460                           sizeof(struct fc_frame_header));
 461         vlan_macip_lens |= ((skb_transport_offset(skb) - 4)
 462                            << IXGBE_ADVTXD_MACLEN_SHIFT);
 463         vlan_macip_lens |= (tx_flags & IXGBE_TX_FLAGS_VLAN_MASK);
 464
 465         /* type_tycmd and mss: set TUCMD.FCoE to enable offload */
 466         type_tucmd = IXGBE_TXD_CMD_DEXT | IXGBE_ADVTXD_DTYP_CTXT |
 467                      IXGBE_ADVTXT_TUCMD_FCOE;
 468         if (skb_is_gso(skb))
 469                 mss = skb_shinfo(skb)->gso_size;
 470         /* mss_l4len_id: use 1 for FSO as TSO, no need for L4LEN */
 471         mss_l4len_idx = (mss << IXGBE_ADVTXD_MSS_SHIFT) |
 472                         (1 << IXGBE_ADVTXD_IDX_SHIFT);
 473
 474         /* write context desc */
 475         i = tx_ring->next_to_use;
 476         context_desc = IXGBE_TX_CTXTDESC_ADV(*tx_ring, i);
 477         context_desc->vlan_macip_lens   = cpu_to_le32(vlan_macip_lens);
 478         context_desc->seqnum_seed       = cpu_to_le32(fcoe_sof_eof);
 479         context_desc->type_tucmd_mlhl   = cpu_to_le32(type_tucmd);
 480         context_desc->mss_l4len_idx     = cpu_to_le32(mss_l4len_idx);
 481
 482         tx_buffer_info = &tx_ring->tx_buffer_info[i];
 483         tx_buffer_info->time_stamp = jiffies;
 484         tx_buffer_info->next_to_watch = i;
 485
 486         i++;
 487         if (i == tx_ring->count)
 488                 i = 0;
 489         tx_ring->next_to_use = i;
 490
 491         return skb_is_gso(skb);
 492 }
 493
 494 /**
 495  * ixgbe_configure_fcoe - configures registers for fcoe at start
 496  * @adapter: ptr to ixgbe adapter
 497  *
 498  * This sets up FCoE related registers
 499  *
 500  * Returns : none
 501  */
 502 void ixgbe_configure_fcoe(struct ixgbe_adapter *adapter)
 503 {
 504         int i, fcoe_q, fcoe_i;
 505         struct ixgbe_hw *hw = &adapter->hw;
 506         struct ixgbe_fcoe *fcoe = &adapter->fcoe;
 507         struct ixgbe_ring_feature *f = &adapter->ring_feature[RING_F_FCOE];
 508 #ifdef CONFIG_IXGBE_DCB
 509         u8 tc;
 510         u32 up2tc;
 511 #endif
 512
 513         /* create the pool for ddp if not created yet */
 514         if (!fcoe->pool) {
 515                 /* allocate ddp pool */
 516                 fcoe->pool = pci_pool_create("ixgbe_fcoe_ddp",
 517                                              adapter->pdev, IXGBE_FCPTR_MAX,
 518                                              IXGBE_FCPTR_ALIGN, PAGE_SIZE);
 519                 if (!fcoe->pool)
 520                         DPRINTK(DRV, ERR,
 521                                 "failed to allocated FCoE DDP pool\n");
 522
 523                 spin_lock_init(&fcoe->lock);
 524         }
 525
 526         /* Enable L2 eth type filter for FCoE */
 527         IXGBE_WRITE_REG(hw, IXGBE_ETQF(IXGBE_ETQF_FILTER_FCOE),
 528                         (ETH_P_FCOE | IXGBE_ETQF_FCOE | IXGBE_ETQF_FILTER_EN));
 529         /* Enable L2 eth type filter for FIP */
 530         IXGBE_WRITE_REG(hw, IXGBE_ETQF(IXGBE_ETQF_FILTER_FIP),
 531                         (ETH_P_FIP | IXGBE_ETQF_FILTER_EN));
 532         if (adapter->ring_feature[RING_F_FCOE].indices) {
 533                 /* Use multiple rx queues for FCoE by redirection table */
 534                 for (i = 0; i < IXGBE_FCRETA_SIZE; i++) {
 535                         fcoe_i = f->mask + i % f->indices;
 536                         fcoe_i &= IXGBE_FCRETA_ENTRY_MASK;
 537                         fcoe_q = adapter->rx_ring[fcoe_i]->reg_idx;
 538                         IXGBE_WRITE_REG(hw, IXGBE_FCRETA(i), fcoe_q);
 539                 }
 540                 IXGBE_WRITE_REG(hw, IXGBE_FCRECTL, IXGBE_FCRECTL_ENA);
 541                 IXGBE_WRITE_REG(hw, IXGBE_ETQS(IXGBE_ETQF_FILTER_FCOE), 0);
 542         } else  {
 543                 /* Use single rx queue for FCoE */
 544                 fcoe_i = f->mask;
 545                 fcoe_q = adapter->rx_ring[fcoe_i]->reg_idx;
 546                 IXGBE_WRITE_REG(hw, IXGBE_FCRECTL, 0);
 547                 IXGBE_WRITE_REG(hw, IXGBE_ETQS(IXGBE_ETQF_FILTER_FCOE),
 548                                 IXGBE_ETQS_QUEUE_EN |
 549                                 (fcoe_q << IXGBE_ETQS_RX_QUEUE_SHIFT));
 550         }
 551         /* send FIP frames to the first FCoE queue */
 552         fcoe_i = f->mask;
 553         fcoe_q = adapter->rx_ring[fcoe_i]->reg_idx;
 554         IXGBE_WRITE_REG(hw, IXGBE_ETQS(IXGBE_ETQF_FILTER_FIP),
 555                         IXGBE_ETQS_QUEUE_EN |
 556                         (fcoe_q << IXGBE_ETQS_RX_QUEUE_SHIFT));
 557
 558         IXGBE_WRITE_REG(hw, IXGBE_FCRXCTRL,
 559                         IXGBE_FCRXCTRL_FCOELLI |
 560                         IXGBE_FCRXCTRL_FCCRCBO |
 561                         (FC_FCOE_VER << IXGBE_FCRXCTRL_FCOEVER_SHIFT));
 562 #ifdef CONFIG_IXGBE_DCB
 563         up2tc = IXGBE_READ_REG(&adapter->hw, IXGBE_RTTUP2TC);
 564         for (i = 0; i < MAX_USER_PRIORITY; i++) {
 565                 tc = (u8)(up2tc >> (i * IXGBE_RTTUP2TC_UP_SHIFT));
 566                 tc &= (MAX_TRAFFIC_CLASS - 1);
 567                 if (fcoe->tc == tc) {
 568                         fcoe->up = i;
 569                         break;
 570                 }
 571         }
 572 #endif
 573 }
 574
 575 /**
 576  * ixgbe_cleanup_fcoe - release all fcoe ddp context resources
 577  * @adapter : ixgbe adapter
 578  *
 579  * Cleans up outstanding ddp context resources
 580  *
 581  * Returns : none
 582  */
 583 void ixgbe_cleanup_fcoe(struct ixgbe_adapter *adapter)
 584 {
 585         int i;
 586         struct ixgbe_fcoe *fcoe = &adapter->fcoe;
 587
 588         /* release ddp resource */
 589         if (fcoe->pool) {
 590                 for (i = 0; i < IXGBE_FCOE_DDP_MAX; i++)
 591                         ixgbe_fcoe_ddp_put(adapter->netdev, i);
 592                 pci_pool_destroy(fcoe->pool);
 593                 fcoe->pool = NULL;
 594         }
 595 }
 596
 597 /**
 598  * ixgbe_fcoe_enable - turn on FCoE offload feature
 599  * @netdev: the corresponding netdev
 600  *
 601  * Turns on FCoE offload feature in 82599.
 602  *
 603  * Returns : 0 indicates success or -EINVAL on failure
 604  */
 605 int ixgbe_fcoe_enable(struct net_device *netdev)
 606 {
 607         int rc = -EINVAL;
 608         struct ixgbe_adapter *adapter = netdev_priv(netdev);
 609
 610
 611         if (!(adapter->flags & IXGBE_FLAG_FCOE_CAPABLE))
 612                 goto out_enable;
 613
 614         if (adapter->flags & IXGBE_FLAG_FCOE_ENABLED)
 615                 goto out_enable;
 616
 617         DPRINTK(DRV, INFO, "Enabling FCoE offload features.\n");
 618         if (netif_running(netdev))
 619                 netdev->netdev_ops->ndo_stop(netdev);
 620
 621         ixgbe_clear_interrupt_scheme(adapter);
 622
 623         adapter->flags |= IXGBE_FLAG_FCOE_ENABLED;
 624         adapter->ring_feature[RING_F_FCOE].indices = IXGBE_FCRETA_SIZE;
 625         netdev->features |= NETIF_F_FCOE_CRC;
 626         netdev->features |= NETIF_F_FSO;
 627         netdev->features |= NETIF_F_FCOE_MTU;
 628         netdev->vlan_features |= NETIF_F_FCOE_CRC;
 629         netdev->vlan_features |= NETIF_F_FSO;
 630         netdev->vlan_features |= NETIF_F_FCOE_MTU;
 631         netdev->fcoe_ddp_xid = IXGBE_FCOE_DDP_MAX - 1;
 632
 633         ixgbe_init_interrupt_scheme(adapter);
 634         netdev_features_change(netdev);
 635
 636         if (netif_running(netdev))
 637                 netdev->netdev_ops->ndo_open(netdev);
 638         rc = 0;
 639
 640 out_enable:
 641         return rc;
 642 }
 643
 644 /**
 645  * ixgbe_fcoe_disable - turn off FCoE offload feature
 646  * @netdev: the corresponding netdev
 647  *
 648  * Turns off FCoE offload feature in 82599.
 649  *
 650  * Returns : 0 indicates success or -EINVAL on failure
 651  */
 652 int ixgbe_fcoe_disable(struct net_device *netdev)
 653 {
 654         int rc = -EINVAL;
 655         struct ixgbe_adapter *adapter = netdev_priv(netdev);
 656
 657         if (!(adapter->flags & IXGBE_FLAG_FCOE_CAPABLE))
 658                 goto out_disable;
 659
 660         if (!(adapter->flags & IXGBE_FLAG_FCOE_ENABLED))
 661                 goto out_disable;
 662
 663         DPRINTK(DRV, INFO, "Disabling FCoE offload features.\n");
 664         if (netif_running(netdev))
 665                 netdev->netdev_ops->ndo_stop(netdev);
 666
 667         ixgbe_clear_interrupt_scheme(adapter);
 668
 669         adapter->flags &= ~IXGBE_FLAG_FCOE_ENABLED;
 670         adapter->ring_feature[RING_F_FCOE].indices = 0;
 671         netdev->features &= ~NETIF_F_FCOE_CRC;
 672         netdev->features &= ~NETIF_F_FSO;
 673         netdev->features &= ~NETIF_F_FCOE_MTU;
 674         netdev->vlan_features &= ~NETIF_F_FCOE_CRC;
 675         netdev->vlan_features &= ~NETIF_F_FSO;
 676         netdev->vlan_features &= ~NETIF_F_FCOE_MTU;
 677         netdev->fcoe_ddp_xid = 0;
 678
 679         ixgbe_cleanup_fcoe(adapter);
 680         ixgbe_init_interrupt_scheme(adapter);
 681         netdev_features_change(netdev);
 682
 683         if (netif_running(netdev))
 684                 netdev->netdev_ops->ndo_open(netdev);
 685         rc = 0;
 686
 687 out_disable:
 688         return rc;
 689 }
 690
 691 #ifdef CONFIG_IXGBE_DCB
 692 /**
 693  * ixgbe_fcoe_getapp - retrieves current user priority bitmap for FCoE
 694  * @adapter : ixgbe adapter
 695  *
 696  * Finds out the corresponding user priority bitmap from the current
 697  * traffic class that FCoE belongs to. Returns 0 as the invalid user
 698  * priority bitmap to indicate an error.
 699  *
 700  * Returns : 802.1p user priority bitmap for FCoE
 701  */
 702 u8 ixgbe_fcoe_getapp(struct ixgbe_adapter *adapter)
 703 {
 704         return 1 << adapter->fcoe.up;
 705 }
 706
 707 /**
 708  * ixgbe_fcoe_setapp - sets the user priority bitmap for FCoE
 709  * @adapter : ixgbe adapter
 710  * @up : 802.1p user priority bitmap
 711  *
 712  * Finds out the traffic class from the input user priority
 713  * bitmap for FCoE.
 714  *
 715  * Returns : 0 on success otherwise returns 1 on error
 716  */
 717 u8 ixgbe_fcoe_setapp(struct ixgbe_adapter *adapter, u8 up)
 718 {
 719         int i;
 720         u32 up2tc;
 721
 722         /* valid user priority bitmap must not be 0 */
 723         if (up) {
 724                 /* from user priority to the corresponding traffic class */
 725                 up2tc = IXGBE_READ_REG(&adapter->hw, IXGBE_RTTUP2TC);
 726                 for (i = 0; i < MAX_USER_PRIORITY; i++) {
 727                         if (up & (1 << i)) {
 728                                 up2tc >>= (i * IXGBE_RTTUP2TC_UP_SHIFT);
 729                                 up2tc &= (MAX_TRAFFIC_CLASS - 1);
 730                                 adapter->fcoe.tc = (u8)up2tc;
 731                                 adapter->fcoe.up = i;
 732                                 return 0;
 733                         }
 734                 }
 735         }
 736
 737         return 1;
 738 }
 739 #endif /* CONFIG_IXGBE_DCB */
 740
 741 /**
 742  * ixgbe_fcoe_get_wwn - get world wide name for the node or the port
 743  * @netdev : ixgbe adapter
 744  * @wwn : the world wide name
 745  * @type: the type of world wide name
 746  *
 747  * Returns the node or port world wide name if both the prefix and the san
 748  * mac address are valid, then the wwn is formed based on the NAA-2 for
 749  * IEEE Extended name identifier (ref. to T10 FC-LS Spec., Sec. 15.3).
 750  *
 751  * Returns : 0 on success
 752  */
 753 int ixgbe_fcoe_get_wwn(struct net_device *netdev, u64 *wwn, int type)
 754 {
 755         int rc = -EINVAL;
 756         u16 prefix = 0xffff;
 757         struct ixgbe_adapter *adapter = netdev_priv(netdev);
 758         struct ixgbe_mac_info *mac = &adapter->hw.mac;
 759
 760         switch (type) {
 761         case NETDEV_FCOE_WWNN:
 762                 prefix = mac->wwnn_prefix;
 763                 break;
 764         case NETDEV_FCOE_WWPN:
 765                 prefix = mac->wwpn_prefix;
 766                 break;
 767         default:
 768                 break;
 769         }
 770
 771         if ((prefix != 0xffff) &&
 772             is_valid_ether_addr(mac->san_addr)) {
 773                 *wwn = ((u64) prefix << 48) |
 774                        ((u64) mac->san_addr[0] << 40) |
 775                        ((u64) mac->san_addr[1] << 32) |
 776                        ((u64) mac->san_addr[2] << 24) |
 777                        ((u64) mac->san_addr[3] << 16) |
 778                        ((u64) mac->san_addr[4] << 8)  |
 779                        ((u64) mac->san_addr[5]);
 780                 rc = 0;
 781         }
 782         return rc;
 783 }
 784
 785