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