drivers/net/ixgbe/ixgbe_fcoe.c

   1 /*******************************************************************************
   2
   3   Intel 10 Gigabit PCI Express Linux driver
   4   Copyright(c) 1999 - 2009 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 <scsi/scsi_cmnd.h>
  35 #include <scsi/scsi_device.h>
  36 #include <scsi/fc/fc_fs.h>
  37 #include <scsi/fc/fc_fcoe.h>
  38 #include <scsi/libfc.h>
  39 #include <scsi/libfcoe.h>
  40
  41 /**
  42  * ixgbe_rx_is_fcoe - check the rx desc for incoming pkt type
  43  * @rx_desc: advanced rx descriptor
  44  *
  45  * Returns : true if it is FCoE pkt
  46  */
  47 static inline bool ixgbe_rx_is_fcoe(union ixgbe_adv_rx_desc *rx_desc)
  48 {
  49         u16 p;
  50
  51         p = le16_to_cpu(rx_desc->wb.lower.lo_dword.hs_rss.pkt_info);
  52         if (p & IXGBE_RXDADV_PKTTYPE_ETQF) {
  53                 p &= IXGBE_RXDADV_PKTTYPE_ETQF_MASK;
  54                 p >>= IXGBE_RXDADV_PKTTYPE_ETQF_SHIFT;
  55                 return p == IXGBE_ETQF_FILTER_FCOE;
  56         }
  57         return false;
  58 }
  59
  60 /**
  61  * ixgbe_fcoe_clear_ddp - clear the given ddp context
  62  * @ddp - ptr to the ixgbe_fcoe_ddp
  63  *
  64  * Returns : none
  65  *
  66  */
  67 static inline void ixgbe_fcoe_clear_ddp(struct ixgbe_fcoe_ddp *ddp)
  68 {
  69         ddp->len = 0;
  70         ddp->err = 0;
  71         ddp->udl = NULL;
  72         ddp->udp = 0UL;
  73         ddp->sgl = NULL;
  74         ddp->sgc = 0;
  75 }
  76
  77 /**
  78  * ixgbe_fcoe_ddp_put - free the ddp context for a given xid
  79  * @netdev: the corresponding net_device
  80  * @xid: the xid that corresponding ddp will be freed
  81  *
  82  * This is the implementation of net_device_ops.ndo_fcoe_ddp_done
  83  * and it is expected to be called by ULD, i.e., FCP layer of libfc
  84  * to release the corresponding ddp context when the I/O is done.
  85  *
  86  * Returns : data length already ddp-ed in bytes
  87  */
  88 int ixgbe_fcoe_ddp_put(struct net_device *netdev, u16 xid)
  89 {
  90         int len = 0;
  91         struct ixgbe_fcoe *fcoe;
  92         struct ixgbe_adapter *adapter;
  93         struct ixgbe_fcoe_ddp *ddp;
  94
  95         if (!netdev)
  96                 goto out_ddp_put;
  97
  98         if (xid >= IXGBE_FCOE_DDP_MAX)
  99                 goto out_ddp_put;
 100
 101         adapter = netdev_priv(netdev);
 102         fcoe = &adapter->fcoe;
 103         ddp = &fcoe->ddp[xid];
 104         if (!ddp->udl)
 105                 goto out_ddp_put;
 106
 107         len = ddp->len;
 108         /* if there an error, force to invalidate ddp context */
 109         if (ddp->err) {
 110                 spin_lock_bh(&fcoe->lock);
 111                 IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCFLT, 0);
 112                 IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCFLTRW,
 113                                 (xid | IXGBE_FCFLTRW_WE));
 114                 IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCBUFF, 0);
 115                 IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCDMARW,
 116                                 (xid | IXGBE_FCDMARW_WE));
 117                 spin_unlock_bh(&fcoe->lock);
 118         }
 119         if (ddp->sgl)
 120                 pci_unmap_sg(adapter->pdev, ddp->sgl, ddp->sgc,
 121                              DMA_FROM_DEVICE);
 122         pci_pool_free(fcoe->pool, ddp->udl, ddp->udp);
 123         ixgbe_fcoe_clear_ddp(ddp);
 124
 125 out_ddp_put:
 126         return len;
 127 }
 128
 129 /**
 130  * ixgbe_fcoe_ddp_get - called to set up ddp context
 131  * @netdev: the corresponding net_device
 132  * @xid: the exchange id requesting ddp
 133  * @sgl: the scatter-gather list for this request
 134  * @sgc: the number of scatter-gather items
 135  *
 136  * This is the implementation of net_device_ops.ndo_fcoe_ddp_setup
 137  * and is expected to be called from ULD, e.g., FCP layer of libfc
 138  * to set up ddp for the corresponding xid of the given sglist for
 139  * the corresponding I/O.
 140  *
 141  * Returns : 1 for success and 0 for no ddp
 142  */
 143 int ixgbe_fcoe_ddp_get(struct net_device *netdev, u16 xid,
 144                        struct scatterlist *sgl, unsigned int sgc)
 145 {
 146         struct ixgbe_adapter *adapter;
 147         struct ixgbe_hw *hw;
 148         struct ixgbe_fcoe *fcoe;
 149         struct ixgbe_fcoe_ddp *ddp;
 150         struct scatterlist *sg;
 151         unsigned int i, j, dmacount;
 152         unsigned int len;
 153         static const unsigned int bufflen = 4096;
 154         unsigned int firstoff = 0;
 155         unsigned int lastsize;
 156         unsigned int thisoff = 0;
 157         unsigned int thislen = 0;
 158         u32 fcbuff, fcdmarw, fcfltrw;
 159         dma_addr_t addr;
 160
 161         if (!netdev || !sgl)
 162                 return 0;
 163
 164         adapter = netdev_priv(netdev);
 165         if (xid >= IXGBE_FCOE_DDP_MAX) {
 166                 DPRINTK(DRV, WARNING, "xid=0x%x out-of-range\n", xid);
 167                 return 0;
 168         }
 169
 170         fcoe = &adapter->fcoe;
 171         if (!fcoe->pool) {
 172                 DPRINTK(DRV, WARNING, "xid=0x%x no ddp pool for fcoe\n", xid);
 173                 return 0;
 174         }
 175
 176         ddp = &fcoe->ddp[xid];
 177         if (ddp->sgl) {
 178                 DPRINTK(DRV, ERR, "xid 0x%x w/ non-null sgl=%p nents=%d\n",
 179                         xid, ddp->sgl, ddp->sgc);
 180                 return 0;
 181         }
 182         ixgbe_fcoe_clear_ddp(ddp);
 183
 184         /* setup dma from scsi command sgl */
 185         dmacount = pci_map_sg(adapter->pdev, sgl, sgc, DMA_FROM_DEVICE);
 186         if (dmacount == 0) {
 187                 DPRINTK(DRV, ERR, "xid 0x%x DMA map error\n", xid);
 188                 return 0;
 189         }
 190
 191         /* alloc the udl from our ddp pool */
 192         ddp->udl = pci_pool_alloc(fcoe->pool, GFP_KERNEL, &ddp->udp);
 193         if (!ddp->udl) {
 194                 DPRINTK(DRV, ERR, "failed allocated ddp context\n");
 195                 goto out_noddp_unmap;
 196         }
 197         ddp->sgl = sgl;
 198         ddp->sgc = sgc;
 199
 200         j = 0;
 201         for_each_sg(sgl, sg, dmacount, i) {
 202                 addr = sg_dma_address(sg);
 203                 len = sg_dma_len(sg);
 204                 while (len) {
 205                         /* get the offset of length of current buffer */
 206                         thisoff = addr & ((dma_addr_t)bufflen - 1);
 207                         thislen = min((bufflen - thisoff), len);
 208                         /*
 209                          * all but the 1st buffer (j == 0)
 210                          * must be aligned on bufflen
 211                          */
 212                         if ((j != 0) && (thisoff))
 213                                 goto out_noddp_free;
 214                         /*
 215                          * all but the last buffer
 216                          * ((i == (dmacount - 1)) && (thislen == len))
 217                          * must end at bufflen
 218                          */
 219                         if (((i != (dmacount - 1)) || (thislen != len))
 220                             && ((thislen + thisoff) != bufflen))
 221                                 goto out_noddp_free;
 222
 223                         ddp->udl[j] = (u64)(addr - thisoff);
 224                         /* only the first buffer may have none-zero offset */
 225                         if (j == 0)
 226                                 firstoff = thisoff;
 227                         len -= thislen;
 228                         addr += thislen;
 229                         j++;
 230                         /* max number of buffers allowed in one DDP context */
 231                         if (j > IXGBE_BUFFCNT_MAX) {
 232                                 DPRINTK(DRV, ERR, "xid=%x:%d,%d,%d:addr=%llx "
 233                                         "not enough descriptors\n",
 234                                         xid, i, j, dmacount, (u64)addr);
 235                                 goto out_noddp_free;
 236                         }
 237                 }
 238         }
 239         /* only the last buffer may have non-full bufflen */
 240         lastsize = thisoff + thislen;
 241
 242         fcbuff = (IXGBE_FCBUFF_4KB << IXGBE_FCBUFF_BUFFSIZE_SHIFT);
 243         fcbuff |= (j << IXGBE_FCBUFF_BUFFCNT_SHIFT);
 244         fcbuff |= (firstoff << IXGBE_FCBUFF_OFFSET_SHIFT);
 245         fcbuff |= (IXGBE_FCBUFF_VALID);
 246
 247         fcdmarw = xid;
 248         fcdmarw |= IXGBE_FCDMARW_WE;
 249         fcdmarw |= (lastsize << IXGBE_FCDMARW_LASTSIZE_SHIFT);
 250
 251         fcfltrw = xid;
 252         fcfltrw |= IXGBE_FCFLTRW_WE;
 253
 254         /* program DMA context */
 255         hw = &adapter->hw;
 256         spin_lock_bh(&fcoe->lock);
 257         IXGBE_WRITE_REG(hw, IXGBE_FCPTRL, ddp->udp & DMA_BIT_MASK(32));
 258         IXGBE_WRITE_REG(hw, IXGBE_FCPTRH, (u64)ddp->udp >> 32);
 259         IXGBE_WRITE_REG(hw, IXGBE_FCBUFF, fcbuff);
 260         IXGBE_WRITE_REG(hw, IXGBE_FCDMARW, fcdmarw);
 261         /* program filter context */
 262         IXGBE_WRITE_REG(hw, IXGBE_FCPARAM, 0);
 263         IXGBE_WRITE_REG(hw, IXGBE_FCFLT, IXGBE_FCFLT_VALID);
 264         IXGBE_WRITE_REG(hw, IXGBE_FCFLTRW, fcfltrw);
 265         spin_unlock_bh(&fcoe->lock);
 266
 267         return 1;
 268
 269 out_noddp_free:
 270         pci_pool_free(fcoe->pool, ddp->udl, ddp->udp);
 271         ixgbe_fcoe_clear_ddp(ddp);
 272
 273 out_noddp_unmap:
 274         pci_unmap_sg(adapter->pdev, sgl, sgc, DMA_FROM_DEVICE);
 275         return 0;
 276 }
 277
 278 /**
 279  * ixgbe_fcoe_ddp - check ddp status and mark it done
 280  * @adapter: ixgbe adapter
 281  * @rx_desc: advanced rx descriptor
 282  * @skb: the skb holding the received data
 283  *
 284  * This checks ddp status.
 285  *
 286  * Returns : < 0 indicates an error or not a FCiE ddp, 0 indicates
 287  * not passing the skb to ULD, > 0 indicates is the length of data
 288  * being ddped.
 289  */
 290 int ixgbe_fcoe_ddp(struct ixgbe_adapter *adapter,
 291                    union ixgbe_adv_rx_desc *rx_desc,
 292                    struct sk_buff *skb)
 293 {
 294         u16 xid;
 295         u32 fctl;
 296         u32 sterr, fceofe, fcerr, fcstat;
 297         int rc = -EINVAL;
 298         struct ixgbe_fcoe *fcoe;
 299         struct ixgbe_fcoe_ddp *ddp;
 300         struct fc_frame_header *fh;
 301
 302         if (!ixgbe_rx_is_fcoe(rx_desc))
 303                 goto ddp_out;
 304
 305         skb->ip_summed = CHECKSUM_UNNECESSARY;
 306         sterr = le32_to_cpu(rx_desc->wb.upper.status_error);
 307         fcerr = (sterr & IXGBE_RXDADV_ERR_FCERR);
 308         fceofe = (sterr & IXGBE_RXDADV_ERR_FCEOFE);
 309         if (fcerr == IXGBE_FCERR_BADCRC)
 310                 skb->ip_summed = CHECKSUM_NONE;
 311
 312         skb_reset_network_header(skb);
 313         skb_set_transport_header(skb, skb_network_offset(skb) +
 314                                  sizeof(struct fcoe_hdr));
 315         fh = (struct fc_frame_header *)skb_transport_header(skb);
 316         fctl = ntoh24(fh->fh_f_ctl);
 317         if (fctl & FC_FC_EX_CTX)
 318                 xid =  be16_to_cpu(fh->fh_ox_id);
 319         else
 320                 xid =  be16_to_cpu(fh->fh_rx_id);
 321
 322         if (xid >= IXGBE_FCOE_DDP_MAX)
 323                 goto ddp_out;
 324
 325         fcoe = &adapter->fcoe;
 326         ddp = &fcoe->ddp[xid];
 327         if (!ddp->udl)
 328                 goto ddp_out;
 329
 330         ddp->err = (fcerr | fceofe);
 331         if (ddp->err)
 332                 goto ddp_out;
 333
 334         fcstat = (sterr & IXGBE_RXDADV_STAT_FCSTAT);
 335         if (fcstat) {
 336                 /* update length of DDPed data */
 337                 ddp->len = le32_to_cpu(rx_desc->wb.lower.hi_dword.rss);
 338                 /* unmap the sg list when FCP_RSP is received */
 339                 if (fcstat == IXGBE_RXDADV_STAT_FCSTAT_FCPRSP) {
 340                         pci_unmap_sg(adapter->pdev, ddp->sgl,
 341                                      ddp->sgc, DMA_FROM_DEVICE);
 342                         ddp->sgl = NULL;
 343                         ddp->sgc = 0;
 344                 }
 345                 /* return 0 to bypass going to ULD for DDPed data */
 346                 if (fcstat == IXGBE_RXDADV_STAT_FCSTAT_DDP)
 347                         rc = 0;
 348                 else if (ddp->len)
 349                         rc = ddp->len;
 350         }
 351
 352 ddp_out:
 353         return rc;
 354 }
 355
 356 /**
 357  * ixgbe_fso - ixgbe FCoE Sequence Offload (FSO)
 358  * @adapter: ixgbe adapter
 359  * @tx_ring: tx desc ring
 360  * @skb: associated skb
 361  * @tx_flags: tx flags
 362  * @hdr_len: hdr_len to be returned
 363  *
 364  * This sets up large send offload for FCoE
 365  *
 366  * Returns : 0 indicates no FSO, > 0 for FSO, < 0 for error
 367  */
 368 int ixgbe_fso(struct ixgbe_adapter *adapter,
 369               struct ixgbe_ring *tx_ring, struct sk_buff *skb,
 370               u32 tx_flags, u8 *hdr_len)
 371 {
 372         u8 sof, eof;
 373         u32 vlan_macip_lens;
 374         u32 fcoe_sof_eof;
 375         u32 type_tucmd;
 376         u32 mss_l4len_idx;
 377         int mss = 0;
 378         unsigned int i;
 379         struct ixgbe_tx_buffer *tx_buffer_info;
 380         struct ixgbe_adv_tx_context_desc *context_desc;
 381         struct fc_frame_header *fh;
 382
 383         if (skb_is_gso(skb) && (skb_shinfo(skb)->gso_type != SKB_GSO_FCOE)) {
 384                 DPRINTK(DRV, ERR, "Wrong gso type %d:expecting SKB_GSO_FCOE\n",
 385                         skb_shinfo(skb)->gso_type);
 386                 return -EINVAL;
 387         }
 388
 389         /* resets the header to point fcoe/fc */
 390         skb_set_network_header(skb, skb->mac_len);
 391         skb_set_transport_header(skb, skb->mac_len +
 392                                  sizeof(struct fcoe_hdr));
 393
 394         /* sets up SOF and ORIS */
 395         fcoe_sof_eof = 0;
 396         sof = ((struct fcoe_hdr *)skb_network_header(skb))->fcoe_sof;
 397         switch (sof) {
 398         case FC_SOF_I2:
 399                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_ORIS;
 400                 break;
 401         case FC_SOF_I3:
 402                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_SOF;
 403                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_ORIS;
 404                 break;
 405         case FC_SOF_N2:
 406                 break;
 407         case FC_SOF_N3:
 408                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_SOF;
 409                 break;
 410         default:
 411                 DPRINTK(DRV, WARNING, "unknown sof = 0x%x\n", sof);
 412                 return -EINVAL;
 413         }
 414
 415         /* the first byte of the last dword is EOF */
 416         skb_copy_bits(skb, skb->len - 4, &eof, 1);
 417         /* sets up EOF and ORIE */
 418         switch (eof) {
 419         case FC_EOF_N:
 420                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_N;
 421                 break;
 422         case FC_EOF_T:
 423                 /* lso needs ORIE */
 424                 if (skb_is_gso(skb)) {
 425                         fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_N;
 426                         fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_ORIE;
 427                 } else {
 428                         fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_T;
 429                 }
 430                 break;
 431         case FC_EOF_NI:
 432                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_NI;
 433                 break;
 434         case FC_EOF_A:
 435                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_A;
 436                 break;
 437         default:
 438                 DPRINTK(DRV, WARNING, "unknown eof = 0x%x\n", eof);
 439                 return -EINVAL;
 440         }
 441
 442         /* sets up PARINC indicating data offset */
 443         fh = (struct fc_frame_header *)skb_transport_header(skb);
 444         if (fh->fh_f_ctl[2] & FC_FC_REL_OFF)
 445                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_PARINC;
 446
 447         /* hdr_len includes fc_hdr if FCoE lso is enabled */
 448         *hdr_len = sizeof(struct fcoe_crc_eof);
 449         if (skb_is_gso(skb))
 450                 *hdr_len += (skb_transport_offset(skb) +
 451                              sizeof(struct fc_frame_header));
 452         /* vlan_macip_lens: HEADLEN, MACLEN, VLAN tag */
 453         vlan_macip_lens = (skb_transport_offset(skb) +
 454                           sizeof(struct fc_frame_header));
 455         vlan_macip_lens |= ((skb_transport_offset(skb) - 4)
 456                            << IXGBE_ADVTXD_MACLEN_SHIFT);
 457         vlan_macip_lens |= (tx_flags & IXGBE_TX_FLAGS_VLAN_MASK);
 458
 459         /* type_tycmd and mss: set TUCMD.FCoE to enable offload */
 460         type_tucmd = IXGBE_TXD_CMD_DEXT | IXGBE_ADVTXD_DTYP_CTXT |
 461                      IXGBE_ADVTXT_TUCMD_FCOE;
 462         if (skb_is_gso(skb))
 463                 mss = skb_shinfo(skb)->gso_size;
 464         /* mss_l4len_id: use 1 for FSO as TSO, no need for L4LEN */
 465         mss_l4len_idx = (mss << IXGBE_ADVTXD_MSS_SHIFT) |
 466                         (1 << IXGBE_ADVTXD_IDX_SHIFT);
 467
 468         /* write context desc */
 469         i = tx_ring->next_to_use;
 470         context_desc = IXGBE_TX_CTXTDESC_ADV(*tx_ring, i);
 471         context_desc->vlan_macip_lens   = cpu_to_le32(vlan_macip_lens);
 472         context_desc->seqnum_seed       = cpu_to_le32(fcoe_sof_eof);
 473         context_desc->type_tucmd_mlhl   = cpu_to_le32(type_tucmd);
 474         context_desc->mss_l4len_idx     = cpu_to_le32(mss_l4len_idx);
 475
 476         tx_buffer_info = &tx_ring->tx_buffer_info[i];
 477         tx_buffer_info->time_stamp = jiffies;
 478         tx_buffer_info->next_to_watch = i;
 479
 480         i++;
 481         if (i == tx_ring->count)
 482                 i = 0;
 483         tx_ring->next_to_use = i;
 484
 485         return skb_is_gso(skb);
 486 }
 487
 488 /**
 489  * ixgbe_configure_fcoe - configures registers for fcoe at start
 490  * @adapter: ptr to ixgbe adapter
 491  *
 492  * This sets up FCoE related registers
 493  *
 494  * Returns : none
 495  */
 496 void ixgbe_configure_fcoe(struct ixgbe_adapter *adapter)
 497 {
 498         int i, fcoe_q, fcoe_i;
 499         struct ixgbe_hw *hw = &adapter->hw;
 500         struct ixgbe_fcoe *fcoe = &adapter->fcoe;
 501         struct ixgbe_ring_feature *f = &adapter->ring_feature[RING_F_FCOE];
 502
 503         /* create the pool for ddp if not created yet */
 504         if (!fcoe->pool) {
 505                 /* allocate ddp pool */
 506                 fcoe->pool = pci_pool_create("ixgbe_fcoe_ddp",
 507                                              adapter->pdev, IXGBE_FCPTR_MAX,
 508                                              IXGBE_FCPTR_ALIGN, PAGE_SIZE);
 509                 if (!fcoe->pool)
 510                         DPRINTK(DRV, ERR,
 511                                 "failed to allocated FCoE DDP pool\n");
 512
 513                 spin_lock_init(&fcoe->lock);
 514         }
 515
 516         /* Enable L2 eth type filter for FCoE */
 517         IXGBE_WRITE_REG(hw, IXGBE_ETQF(IXGBE_ETQF_FILTER_FCOE),
 518                         (ETH_P_FCOE | IXGBE_ETQF_FCOE | IXGBE_ETQF_FILTER_EN));
 519         if (adapter->ring_feature[RING_F_FCOE].indices) {
 520                 /* Use multiple rx queues for FCoE by redirection table */
 521                 for (i = 0; i < IXGBE_FCRETA_SIZE; i++) {
 522                         fcoe_i = f->mask + i % f->indices;
 523                         fcoe_i &= IXGBE_FCRETA_ENTRY_MASK;
 524                         fcoe_q = adapter->rx_ring[fcoe_i].reg_idx;
 525                         IXGBE_WRITE_REG(hw, IXGBE_FCRETA(i), fcoe_q);
 526                 }
 527                 IXGBE_WRITE_REG(hw, IXGBE_FCRECTL, IXGBE_FCRECTL_ENA);
 528                 IXGBE_WRITE_REG(hw, IXGBE_ETQS(IXGBE_ETQF_FILTER_FCOE), 0);
 529         } else  {
 530                 /* Use single rx queue for FCoE */
 531                 fcoe_i = f->mask;
 532                 fcoe_q = adapter->rx_ring[fcoe_i].reg_idx;
 533                 IXGBE_WRITE_REG(hw, IXGBE_FCRECTL, 0);
 534                 IXGBE_WRITE_REG(hw, IXGBE_ETQS(IXGBE_ETQF_FILTER_FCOE),
 535                                 IXGBE_ETQS_QUEUE_EN |
 536                                 (fcoe_q << IXGBE_ETQS_RX_QUEUE_SHIFT));
 537         }
 538
 539         IXGBE_WRITE_REG(hw, IXGBE_FCRXCTRL,
 540                         IXGBE_FCRXCTRL_FCOELLI |
 541                         IXGBE_FCRXCTRL_FCCRCBO |
 542                         (FC_FCOE_VER << IXGBE_FCRXCTRL_FCOEVER_SHIFT));
 543 }
 544
 545 /**
 546  * ixgbe_cleanup_fcoe - release all fcoe ddp context resources
 547  * @adapter : ixgbe adapter
 548  *
 549  * Cleans up outstanding ddp context resources
 550  *
 551  * Returns : none
 552  */
 553 void ixgbe_cleanup_fcoe(struct ixgbe_adapter *adapter)
 554 {
 555         int i;
 556         struct ixgbe_fcoe *fcoe = &adapter->fcoe;
 557
 558         /* release ddp resource */
 559         if (fcoe->pool) {
 560                 for (i = 0; i < IXGBE_FCOE_DDP_MAX; i++)
 561                         ixgbe_fcoe_ddp_put(adapter->netdev, i);
 562                 pci_pool_destroy(fcoe->pool);
 563                 fcoe->pool = NULL;
 564         }
 565 }
 566
 567 /**
 568  * ixgbe_fcoe_enable - turn on FCoE offload feature
 569  * @netdev: the corresponding netdev
 570  *
 571  * Turns on FCoE offload feature in 82599.
 572  *
 573  * Returns : 0 indicates success or -EINVAL on failure
 574  */
 575 int ixgbe_fcoe_enable(struct net_device *netdev)
 576 {
 577         int rc = -EINVAL;
 578         struct ixgbe_adapter *adapter = netdev_priv(netdev);
 579
 580
 581         if (!(adapter->flags & IXGBE_FLAG_FCOE_CAPABLE))
 582                 goto out_enable;
 583
 584         if (adapter->flags & IXGBE_FLAG_FCOE_ENABLED)
 585                 goto out_enable;
 586
 587         DPRINTK(DRV, INFO, "Enabling FCoE offload features.\n");
 588         if (netif_running(netdev))
 589                 netdev->netdev_ops->ndo_stop(netdev);
 590
 591         ixgbe_clear_interrupt_scheme(adapter);
 592
 593         adapter->flags |= IXGBE_FLAG_FCOE_ENABLED;
 594         adapter->ring_feature[RING_F_FCOE].indices = IXGBE_FCRETA_SIZE;
 595         netdev->features |= NETIF_F_FCOE_CRC;
 596         netdev->features |= NETIF_F_FSO;
 597         netdev->features |= NETIF_F_FCOE_MTU;
 598         netdev->vlan_features |= NETIF_F_FCOE_CRC;
 599         netdev->vlan_features |= NETIF_F_FSO;
 600         netdev->vlan_features |= NETIF_F_FCOE_MTU;
 601         netdev->fcoe_ddp_xid = IXGBE_FCOE_DDP_MAX - 1;
 602         netdev_features_change(netdev);
 603
 604         ixgbe_init_interrupt_scheme(adapter);
 605
 606         if (netif_running(netdev))
 607                 netdev->netdev_ops->ndo_open(netdev);
 608         rc = 0;
 609
 610 out_enable:
 611         return rc;
 612 }
 613
 614 /**
 615  * ixgbe_fcoe_disable - turn off FCoE offload feature
 616  * @netdev: the corresponding netdev
 617  *
 618  * Turns off FCoE offload feature in 82599.
 619  *
 620  * Returns : 0 indicates success or -EINVAL on failure
 621  */
 622 int ixgbe_fcoe_disable(struct net_device *netdev)
 623 {
 624         int rc = -EINVAL;
 625         struct ixgbe_adapter *adapter = netdev_priv(netdev);
 626
 627         if (!(adapter->flags & IXGBE_FLAG_FCOE_CAPABLE))
 628                 goto out_disable;
 629
 630         if (!(adapter->flags & IXGBE_FLAG_FCOE_ENABLED))
 631                 goto out_disable;
 632
 633         DPRINTK(DRV, INFO, "Disabling FCoE offload features.\n");
 634         if (netif_running(netdev))
 635                 netdev->netdev_ops->ndo_stop(netdev);
 636
 637         ixgbe_clear_interrupt_scheme(adapter);
 638
 639         adapter->flags &= ~IXGBE_FLAG_FCOE_ENABLED;
 640         adapter->ring_feature[RING_F_FCOE].indices = 0;
 641         netdev->features &= ~NETIF_F_FCOE_CRC;
 642         netdev->features &= ~NETIF_F_FSO;
 643         netdev->features &= ~NETIF_F_FCOE_MTU;
 644         netdev->vlan_features &= ~NETIF_F_FCOE_CRC;
 645         netdev->vlan_features &= ~NETIF_F_FSO;
 646         netdev->vlan_features &= ~NETIF_F_FCOE_MTU;
 647         netdev->fcoe_ddp_xid = 0;
 648         netdev_features_change(netdev);
 649
 650         ixgbe_cleanup_fcoe(adapter);
 651
 652         ixgbe_init_interrupt_scheme(adapter);
 653         if (netif_running(netdev))
 654                 netdev->netdev_ops->ndo_open(netdev);
 655         rc = 0;
 656
 657 out_disable:
 658         return rc;
 659 }
 660
 661 #ifdef CONFIG_IXGBE_DCB
 662 /**
 663  * ixgbe_fcoe_getapp - retrieves current user priority bitmap for FCoE
 664  * @adapter : ixgbe adapter
 665  *
 666  * Finds out the corresponding user priority bitmap from the current
 667  * traffic class that FCoE belongs to. Returns 0 as the invalid user
 668  * priority bitmap to indicate an error.
 669  *
 670  * Returns : 802.1p user priority bitmap for FCoE
 671  */
 672 u8 ixgbe_fcoe_getapp(struct ixgbe_adapter *adapter)
 673 {
 674         int i;
 675         u8 tc;
 676         u32 up2tc;
 677
 678         up2tc = IXGBE_READ_REG(&adapter->hw, IXGBE_RTTUP2TC);
 679         for (i = 0; i < MAX_USER_PRIORITY; i++) {
 680                 tc = (u8)(up2tc >> (i * IXGBE_RTTUP2TC_UP_SHIFT));
 681                 tc &= (MAX_TRAFFIC_CLASS - 1);
 682                 if (adapter->fcoe.tc == tc)
 683                         return 1 << i;
 684         }
 685
 686         return 0;
 687 }
 688
 689 /**
 690  * ixgbe_fcoe_setapp - sets the user priority bitmap for FCoE
 691  * @adapter : ixgbe adapter
 692  * @up : 802.1p user priority bitmap
 693  *
 694  * Finds out the traffic class from the input user priority
 695  * bitmap for FCoE.
 696  *
 697  * Returns : 0 on success otherwise returns 1 on error
 698  */
 699 u8 ixgbe_fcoe_setapp(struct ixgbe_adapter *adapter, u8 up)
 700 {
 701         int i;
 702         u32 up2tc;
 703
 704         /* valid user priority bitmap must not be 0 */
 705         if (up) {
 706                 /* from user priority to the corresponding traffic class */
 707                 up2tc = IXGBE_READ_REG(&adapter->hw, IXGBE_RTTUP2TC);
 708                 for (i = 0; i < MAX_USER_PRIORITY; i++) {
 709                         if (up & (1 << i)) {
 710                                 up2tc >>= (i * IXGBE_RTTUP2TC_UP_SHIFT);
 711                                 up2tc &= (MAX_TRAFFIC_CLASS - 1);
 712                                 adapter->fcoe.tc = (u8)up2tc;
 713                                 return 0;
 714                         }
 715                 }
 716         }
 717
 718         return 1;
 719 }
 720 #endif /* CONFIG_IXGBE_DCB */