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 = 1;
  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         u32 fcbuff;
  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
 120                 /* guaranteed to be invalidated after 100us */
 121                 IXGBE_WRITE_REG(&adapter->hw, IXGBE_FCDMARW,
 122                                 (xid | IXGBE_FCDMARW_RE));
 123                 fcbuff = IXGBE_READ_REG(&adapter->hw, IXGBE_FCBUFF);
 124                 spin_unlock_bh(&fcoe->lock);
 125                 if (fcbuff & IXGBE_FCBUFF_VALID)
 126                         udelay(100);
 127         }
 128         if (ddp->sgl)
 129                 pci_unmap_sg(adapter->pdev, ddp->sgl, ddp->sgc,
 130                              DMA_FROM_DEVICE);
 131         pci_pool_free(fcoe->pool, ddp->udl, ddp->udp);
 132         ixgbe_fcoe_clear_ddp(ddp);
 133
 134 out_ddp_put:
 135         return len;
 136 }
 137
 138 /**
 139  * ixgbe_fcoe_ddp_get - called to set up ddp context
 140  * @netdev: the corresponding net_device
 141  * @xid: the exchange id requesting ddp
 142  * @sgl: the scatter-gather list for this request
 143  * @sgc: the number of scatter-gather items
 144  *
 145  * This is the implementation of net_device_ops.ndo_fcoe_ddp_setup
 146  * and is expected to be called from ULD, e.g., FCP layer of libfc
 147  * to set up ddp for the corresponding xid of the given sglist for
 148  * the corresponding I/O.
 149  *
 150  * Returns : 1 for success and 0 for no ddp
 151  */
 152 int ixgbe_fcoe_ddp_get(struct net_device *netdev, u16 xid,
 153                        struct scatterlist *sgl, unsigned int sgc)
 154 {
 155         struct ixgbe_adapter *adapter;
 156         struct ixgbe_hw *hw;
 157         struct ixgbe_fcoe *fcoe;
 158         struct ixgbe_fcoe_ddp *ddp;
 159         struct scatterlist *sg;
 160         unsigned int i, j, dmacount;
 161         unsigned int len;
 162         static const unsigned int bufflen = IXGBE_FCBUFF_MIN;
 163         unsigned int firstoff = 0;
 164         unsigned int lastsize;
 165         unsigned int thisoff = 0;
 166         unsigned int thislen = 0;
 167         u32 fcbuff, fcdmarw, fcfltrw;
 168         dma_addr_t addr = 0;
 169
 170         if (!netdev || !sgl)
 171                 return 0;
 172
 173         adapter = netdev_priv(netdev);
 174         if (xid >= IXGBE_FCOE_DDP_MAX) {
 175                 e_warn(drv, "xid=0x%x out-of-range\n", xid);
 176                 return 0;
 177         }
 178
 179         /* no DDP if we are already down or resetting */
 180         if (test_bit(__IXGBE_DOWN, &adapter->state) ||
 181             test_bit(__IXGBE_RESETTING, &adapter->state))
 182                 return 0;
 183
 184         fcoe = &adapter->fcoe;
 185         if (!fcoe->pool) {
 186                 e_warn(drv, "xid=0x%x no ddp pool for fcoe\n", xid);
 187                 return 0;
 188         }
 189
 190         ddp = &fcoe->ddp[xid];
 191         if (ddp->sgl) {
 192                 e_err(drv, "xid 0x%x w/ non-null sgl=%p nents=%d\n",
 193                       xid, ddp->sgl, ddp->sgc);
 194                 return 0;
 195         }
 196         ixgbe_fcoe_clear_ddp(ddp);
 197
 198         /* setup dma from scsi command sgl */
 199         dmacount = pci_map_sg(adapter->pdev, sgl, sgc, DMA_FROM_DEVICE);
 200         if (dmacount == 0) {
 201                 e_err(drv, "xid 0x%x DMA map error\n", xid);
 202                 return 0;
 203         }
 204
 205         /* alloc the udl from our ddp pool */
 206         ddp->udl = pci_pool_alloc(fcoe->pool, GFP_ATOMIC, &ddp->udp);
 207         if (!ddp->udl) {
 208                 e_err(drv, "failed allocated ddp context\n");
 209                 goto out_noddp_unmap;
 210         }
 211         ddp->sgl = sgl;
 212         ddp->sgc = sgc;
 213
 214         j = 0;
 215         for_each_sg(sgl, sg, dmacount, i) {
 216                 addr = sg_dma_address(sg);
 217                 len = sg_dma_len(sg);
 218                 while (len) {
 219                         /* max number of buffers allowed in one DDP context */
 220                         if (j >= IXGBE_BUFFCNT_MAX) {
 221                                 e_err(drv, "xid=%x:%d,%d,%d:addr=%llx "
 222                                       "not enough descriptors\n",
 223                                       xid, i, j, dmacount, (u64)addr);
 224                                 goto out_noddp_free;
 225                         }
 226
 227                         /* get the offset of length of current buffer */
 228                         thisoff = addr & ((dma_addr_t)bufflen - 1);
 229                         thislen = min((bufflen - thisoff), len);
 230                         /*
 231                          * all but the 1st buffer (j == 0)
 232                          * must be aligned on bufflen
 233                          */
 234                         if ((j != 0) && (thisoff))
 235                                 goto out_noddp_free;
 236                         /*
 237                          * all but the last buffer
 238                          * ((i == (dmacount - 1)) && (thislen == len))
 239                          * must end at bufflen
 240                          */
 241                         if (((i != (dmacount - 1)) || (thislen != len))
 242                             && ((thislen + thisoff) != bufflen))
 243                                 goto out_noddp_free;
 244
 245                         ddp->udl[j] = (u64)(addr - thisoff);
 246                         /* only the first buffer may have none-zero offset */
 247                         if (j == 0)
 248                                 firstoff = thisoff;
 249                         len -= thislen;
 250                         addr += thislen;
 251                         j++;
 252                 }
 253         }
 254         /* only the last buffer may have non-full bufflen */
 255         lastsize = thisoff + thislen;
 256
 257         /*
 258          * lastsize can not be buffer len.
 259          * If it is then adding another buffer with lastsize = 1.
 260          */
 261         if (lastsize == bufflen) {
 262                 if (j >= IXGBE_BUFFCNT_MAX) {
 263                         e_err(drv, "xid=%x:%d,%d,%d:addr=%llx "
 264                                 "not enough user buffers. We need an extra "
 265                                 "buffer because lastsize is bufflen.\n",
 266                                 xid, i, j, dmacount, (u64)addr);
 267                         goto out_noddp_free;
 268                 }
 269
 270                 ddp->udl[j] = (u64)(fcoe->extra_ddp_buffer_dma);
 271                 j++;
 272                 lastsize = 1;
 273         }
 274
 275         fcbuff = (IXGBE_FCBUFF_4KB << IXGBE_FCBUFF_BUFFSIZE_SHIFT);
 276         fcbuff |= ((j & 0xff) << IXGBE_FCBUFF_BUFFCNT_SHIFT);
 277         fcbuff |= (firstoff << IXGBE_FCBUFF_OFFSET_SHIFT);
 278         fcbuff |= (IXGBE_FCBUFF_VALID);
 279
 280         fcdmarw = xid;
 281         fcdmarw |= IXGBE_FCDMARW_WE;
 282         fcdmarw |= (lastsize << IXGBE_FCDMARW_LASTSIZE_SHIFT);
 283
 284         fcfltrw = xid;
 285         fcfltrw |= IXGBE_FCFLTRW_WE;
 286
 287         /* program DMA context */
 288         hw = &adapter->hw;
 289         spin_lock_bh(&fcoe->lock);
 290         IXGBE_WRITE_REG(hw, IXGBE_FCPTRL, ddp->udp & DMA_BIT_MASK(32));
 291         IXGBE_WRITE_REG(hw, IXGBE_FCPTRH, (u64)ddp->udp >> 32);
 292         IXGBE_WRITE_REG(hw, IXGBE_FCBUFF, fcbuff);
 293         IXGBE_WRITE_REG(hw, IXGBE_FCDMARW, fcdmarw);
 294         /* program filter context */
 295         IXGBE_WRITE_REG(hw, IXGBE_FCPARAM, 0);
 296         IXGBE_WRITE_REG(hw, IXGBE_FCFLT, IXGBE_FCFLT_VALID);
 297         IXGBE_WRITE_REG(hw, IXGBE_FCFLTRW, fcfltrw);
 298         spin_unlock_bh(&fcoe->lock);
 299
 300         return 1;
 301
 302 out_noddp_free:
 303         pci_pool_free(fcoe->pool, ddp->udl, ddp->udp);
 304         ixgbe_fcoe_clear_ddp(ddp);
 305
 306 out_noddp_unmap:
 307         pci_unmap_sg(adapter->pdev, sgl, sgc, DMA_FROM_DEVICE);
 308         return 0;
 309 }
 310
 311 /**
 312  * ixgbe_fcoe_ddp - check ddp status and mark it done
 313  * @adapter: ixgbe adapter
 314  * @rx_desc: advanced rx descriptor
 315  * @skb: the skb holding the received data
 316  *
 317  * This checks ddp status.
 318  *
 319  * Returns : < 0 indicates an error or not a FCiE ddp, 0 indicates
 320  * not passing the skb to ULD, > 0 indicates is the length of data
 321  * being ddped.
 322  */
 323 int ixgbe_fcoe_ddp(struct ixgbe_adapter *adapter,
 324                    union ixgbe_adv_rx_desc *rx_desc,
 325                    struct sk_buff *skb)
 326 {
 327         u16 xid;
 328         u32 fctl;
 329         u32 sterr, fceofe, fcerr, fcstat;
 330         int rc = -EINVAL;
 331         struct ixgbe_fcoe *fcoe;
 332         struct ixgbe_fcoe_ddp *ddp;
 333         struct fc_frame_header *fh;
 334
 335         if (!ixgbe_rx_is_fcoe(rx_desc))
 336                 goto ddp_out;
 337
 338         sterr = le32_to_cpu(rx_desc->wb.upper.status_error);
 339         fcerr = (sterr & IXGBE_RXDADV_ERR_FCERR);
 340         fceofe = (sterr & IXGBE_RXDADV_ERR_FCEOFE);
 341         if (fcerr == IXGBE_FCERR_BADCRC)
 342                 skb_checksum_none_assert(skb);
 343         else
 344                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 345
 346         if (eth_hdr(skb)->h_proto == htons(ETH_P_8021Q))
 347                 fh = (struct fc_frame_header *)(skb->data +
 348                         sizeof(struct vlan_hdr) + sizeof(struct fcoe_hdr));
 349         else
 350                 fh = (struct fc_frame_header *)(skb->data +
 351                         sizeof(struct fcoe_hdr));
 352         fctl = ntoh24(fh->fh_f_ctl);
 353         if (fctl & FC_FC_EX_CTX)
 354                 xid =  be16_to_cpu(fh->fh_ox_id);
 355         else
 356                 xid =  be16_to_cpu(fh->fh_rx_id);
 357
 358         if (xid >= IXGBE_FCOE_DDP_MAX)
 359                 goto ddp_out;
 360
 361         fcoe = &adapter->fcoe;
 362         ddp = &fcoe->ddp[xid];
 363         if (!ddp->udl)
 364                 goto ddp_out;
 365
 366         ddp->err = (fcerr | fceofe);
 367         if (ddp->err)
 368                 goto ddp_out;
 369
 370         fcstat = (sterr & IXGBE_RXDADV_STAT_FCSTAT);
 371         if (fcstat) {
 372                 /* update length of DDPed data */
 373                 ddp->len = le32_to_cpu(rx_desc->wb.lower.hi_dword.rss);
 374                 /* unmap the sg list when FCP_RSP is received */
 375                 if (fcstat == IXGBE_RXDADV_STAT_FCSTAT_FCPRSP) {
 376                         pci_unmap_sg(adapter->pdev, ddp->sgl,
 377                                      ddp->sgc, DMA_FROM_DEVICE);
 378                         ddp->sgl = NULL;
 379                         ddp->sgc = 0;
 380                 }
 381                 /* return 0 to bypass going to ULD for DDPed data */
 382                 if (fcstat == IXGBE_RXDADV_STAT_FCSTAT_DDP)
 383                         rc = 0;
 384                 else if (ddp->len)
 385                         rc = ddp->len;
 386         }
 387
 388 ddp_out:
 389         return rc;
 390 }
 391
 392 /**
 393  * ixgbe_fso - ixgbe FCoE Sequence Offload (FSO)
 394  * @adapter: ixgbe adapter
 395  * @tx_ring: tx desc ring
 396  * @skb: associated skb
 397  * @tx_flags: tx flags
 398  * @hdr_len: hdr_len to be returned
 399  *
 400  * This sets up large send offload for FCoE
 401  *
 402  * Returns : 0 indicates no FSO, > 0 for FSO, < 0 for error
 403  */
 404 int ixgbe_fso(struct ixgbe_adapter *adapter,
 405               struct ixgbe_ring *tx_ring, struct sk_buff *skb,
 406               u32 tx_flags, u8 *hdr_len)
 407 {
 408         u8 sof, eof;
 409         u32 vlan_macip_lens;
 410         u32 fcoe_sof_eof;
 411         u32 type_tucmd;
 412         u32 mss_l4len_idx;
 413         int mss = 0;
 414         unsigned int i;
 415         struct ixgbe_tx_buffer *tx_buffer_info;
 416         struct ixgbe_adv_tx_context_desc *context_desc;
 417         struct fc_frame_header *fh;
 418
 419         if (skb_is_gso(skb) && (skb_shinfo(skb)->gso_type != SKB_GSO_FCOE)) {
 420                 e_err(drv, "Wrong gso type %d:expecting SKB_GSO_FCOE\n",
 421                       skb_shinfo(skb)->gso_type);
 422                 return -EINVAL;
 423         }
 424
 425         /* resets the header to point fcoe/fc */
 426         skb_set_network_header(skb, skb->mac_len);
 427         skb_set_transport_header(skb, skb->mac_len +
 428                                  sizeof(struct fcoe_hdr));
 429
 430         /* sets up SOF and ORIS */
 431         fcoe_sof_eof = 0;
 432         sof = ((struct fcoe_hdr *)skb_network_header(skb))->fcoe_sof;
 433         switch (sof) {
 434         case FC_SOF_I2:
 435                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_ORIS;
 436                 break;
 437         case FC_SOF_I3:
 438                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_SOF;
 439                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_ORIS;
 440                 break;
 441         case FC_SOF_N2:
 442                 break;
 443         case FC_SOF_N3:
 444                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_SOF;
 445                 break;
 446         default:
 447                 e_warn(drv, "unknown sof = 0x%x\n", sof);
 448                 return -EINVAL;
 449         }
 450
 451         /* the first byte of the last dword is EOF */
 452         skb_copy_bits(skb, skb->len - 4, &eof, 1);
 453         /* sets up EOF and ORIE */
 454         switch (eof) {
 455         case FC_EOF_N:
 456                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_N;
 457                 break;
 458         case FC_EOF_T:
 459                 /* lso needs ORIE */
 460                 if (skb_is_gso(skb)) {
 461                         fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_N;
 462                         fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_ORIE;
 463                 } else {
 464                         fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_T;
 465                 }
 466                 break;
 467         case FC_EOF_NI:
 468                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_NI;
 469                 break;
 470         case FC_EOF_A:
 471                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_A;
 472                 break;
 473         default:
 474                 e_warn(drv, "unknown eof = 0x%x\n", eof);
 475                 return -EINVAL;
 476         }
 477
 478         /* sets up PARINC indicating data offset */
 479         fh = (struct fc_frame_header *)skb_transport_header(skb);
 480         if (fh->fh_f_ctl[2] & FC_FC_REL_OFF)
 481                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_PARINC;
 482
 483         /* hdr_len includes fc_hdr if FCoE lso is enabled */
 484         *hdr_len = sizeof(struct fcoe_crc_eof);
 485         if (skb_is_gso(skb))
 486                 *hdr_len += (skb_transport_offset(skb) +
 487                              sizeof(struct fc_frame_header));
 488         /* vlan_macip_lens: HEADLEN, MACLEN, VLAN tag */
 489         vlan_macip_lens = (skb_transport_offset(skb) +
 490                           sizeof(struct fc_frame_header));
 491         vlan_macip_lens |= ((skb_transport_offset(skb) - 4)
 492                            << IXGBE_ADVTXD_MACLEN_SHIFT);
 493         vlan_macip_lens |= (tx_flags & IXGBE_TX_FLAGS_VLAN_MASK);
 494
 495         /* type_tycmd and mss: set TUCMD.FCoE to enable offload */
 496         type_tucmd = IXGBE_TXD_CMD_DEXT | IXGBE_ADVTXD_DTYP_CTXT |
 497                      IXGBE_ADVTXT_TUCMD_FCOE;
 498         if (skb_is_gso(skb))
 499                 mss = skb_shinfo(skb)->gso_size;
 500         /* mss_l4len_id: use 1 for FSO as TSO, no need for L4LEN */
 501         mss_l4len_idx = (mss << IXGBE_ADVTXD_MSS_SHIFT) |
 502                         (1 << IXGBE_ADVTXD_IDX_SHIFT);
 503
 504         /* write context desc */
 505         i = tx_ring->next_to_use;
 506         context_desc = IXGBE_TX_CTXTDESC_ADV(tx_ring, i);
 507         context_desc->vlan_macip_lens   = cpu_to_le32(vlan_macip_lens);
 508         context_desc->seqnum_seed       = cpu_to_le32(fcoe_sof_eof);
 509         context_desc->type_tucmd_mlhl   = cpu_to_le32(type_tucmd);
 510         context_desc->mss_l4len_idx     = cpu_to_le32(mss_l4len_idx);
 511
 512         tx_buffer_info = &tx_ring->tx_buffer_info[i];
 513         tx_buffer_info->time_stamp = jiffies;
 514         tx_buffer_info->next_to_watch = i;
 515
 516         i++;
 517         if (i == tx_ring->count)
 518                 i = 0;
 519         tx_ring->next_to_use = i;
 520
 521         return skb_is_gso(skb);
 522 }
 523
 524 /**
 525  * ixgbe_configure_fcoe - configures registers for fcoe at start
 526  * @adapter: ptr to ixgbe adapter
 527  *
 528  * This sets up FCoE related registers
 529  *
 530  * Returns : none
 531  */
 532 void ixgbe_configure_fcoe(struct ixgbe_adapter *adapter)
 533 {
 534         int i, fcoe_q, fcoe_i;
 535         struct ixgbe_hw *hw = &adapter->hw;
 536         struct ixgbe_fcoe *fcoe = &adapter->fcoe;
 537         struct ixgbe_ring_feature *f = &adapter->ring_feature[RING_F_FCOE];
 538 #ifdef CONFIG_IXGBE_DCB
 539         u8 tc;
 540         u32 up2tc;
 541 #endif
 542
 543         /* create the pool for ddp if not created yet */
 544         if (!fcoe->pool) {
 545                 /* allocate ddp pool */
 546                 fcoe->pool = pci_pool_create("ixgbe_fcoe_ddp",
 547                                              adapter->pdev, IXGBE_FCPTR_MAX,
 548                                              IXGBE_FCPTR_ALIGN, PAGE_SIZE);
 549                 if (!fcoe->pool)
 550                         e_err(drv, "failed to allocated FCoE DDP pool\n");
 551
 552                 spin_lock_init(&fcoe->lock);
 553
 554                 /* Extra buffer to be shared by all DDPs for HW work around */
 555                 fcoe->extra_ddp_buffer = kmalloc(IXGBE_FCBUFF_MIN, GFP_ATOMIC);
 556                 if (fcoe->extra_ddp_buffer == NULL) {
 557                         e_err(drv, "failed to allocated extra DDP buffer\n");
 558                         goto out_extra_ddp_buffer_alloc;
 559                 }
 560
 561                 fcoe->extra_ddp_buffer_dma =
 562                         dma_map_single(&adapter->pdev->dev,
 563                                        fcoe->extra_ddp_buffer,
 564                                        IXGBE_FCBUFF_MIN,
 565                                        DMA_FROM_DEVICE);
 566                 if (dma_mapping_error(&adapter->pdev->dev,
 567                                       fcoe->extra_ddp_buffer_dma)) {
 568                         e_err(drv, "failed to map extra DDP buffer\n");
 569                         goto out_extra_ddp_buffer_dma;
 570                 }
 571         }
 572
 573         /* Enable L2 eth type filter for FCoE */
 574         IXGBE_WRITE_REG(hw, IXGBE_ETQF(IXGBE_ETQF_FILTER_FCOE),
 575                         (ETH_P_FCOE | IXGBE_ETQF_FCOE | IXGBE_ETQF_FILTER_EN));
 576         /* Enable L2 eth type filter for FIP */
 577         IXGBE_WRITE_REG(hw, IXGBE_ETQF(IXGBE_ETQF_FILTER_FIP),
 578                         (ETH_P_FIP | IXGBE_ETQF_FILTER_EN));
 579         if (adapter->ring_feature[RING_F_FCOE].indices) {
 580                 /* Use multiple rx queues for FCoE by redirection table */
 581                 for (i = 0; i < IXGBE_FCRETA_SIZE; i++) {
 582                         fcoe_i = f->mask + i % f->indices;
 583                         fcoe_i &= IXGBE_FCRETA_ENTRY_MASK;
 584                         fcoe_q = adapter->rx_ring[fcoe_i]->reg_idx;
 585                         IXGBE_WRITE_REG(hw, IXGBE_FCRETA(i), fcoe_q);
 586                 }
 587                 IXGBE_WRITE_REG(hw, IXGBE_FCRECTL, IXGBE_FCRECTL_ENA);
 588                 IXGBE_WRITE_REG(hw, IXGBE_ETQS(IXGBE_ETQF_FILTER_FCOE), 0);
 589         } else  {
 590                 /* Use single rx queue for FCoE */
 591                 fcoe_i = f->mask;
 592                 fcoe_q = adapter->rx_ring[fcoe_i]->reg_idx;
 593                 IXGBE_WRITE_REG(hw, IXGBE_FCRECTL, 0);
 594                 IXGBE_WRITE_REG(hw, IXGBE_ETQS(IXGBE_ETQF_FILTER_FCOE),
 595                                 IXGBE_ETQS_QUEUE_EN |
 596                                 (fcoe_q << IXGBE_ETQS_RX_QUEUE_SHIFT));
 597         }
 598         /* send FIP frames to the first FCoE queue */
 599         fcoe_i = f->mask;
 600         fcoe_q = adapter->rx_ring[fcoe_i]->reg_idx;
 601         IXGBE_WRITE_REG(hw, IXGBE_ETQS(IXGBE_ETQF_FILTER_FIP),
 602                         IXGBE_ETQS_QUEUE_EN |
 603                         (fcoe_q << IXGBE_ETQS_RX_QUEUE_SHIFT));
 604
 605         IXGBE_WRITE_REG(hw, IXGBE_FCRXCTRL,
 606                         IXGBE_FCRXCTRL_FCOELLI |
 607                         IXGBE_FCRXCTRL_FCCRCBO |
 608                         (FC_FCOE_VER << IXGBE_FCRXCTRL_FCOEVER_SHIFT));
 609 #ifdef CONFIG_IXGBE_DCB
 610         up2tc = IXGBE_READ_REG(&adapter->hw, IXGBE_RTTUP2TC);
 611         for (i = 0; i < MAX_USER_PRIORITY; i++) {
 612                 tc = (u8)(up2tc >> (i * IXGBE_RTTUP2TC_UP_SHIFT));
 613                 tc &= (MAX_TRAFFIC_CLASS - 1);
 614                 if (fcoe->tc == tc) {
 615                         fcoe->up = i;
 616                         break;
 617                 }
 618         }
 619 #endif
 620
 621         return;
 622
 623 out_extra_ddp_buffer_dma:
 624         kfree(fcoe->extra_ddp_buffer);
 625 out_extra_ddp_buffer_alloc:
 626         pci_pool_destroy(fcoe->pool);
 627         fcoe->pool = NULL;
 628 }
 629
 630 /**
 631  * ixgbe_cleanup_fcoe - release all fcoe ddp context resources
 632  * @adapter : ixgbe adapter
 633  *
 634  * Cleans up outstanding ddp context resources
 635  *
 636  * Returns : none
 637  */
 638 void ixgbe_cleanup_fcoe(struct ixgbe_adapter *adapter)
 639 {
 640         int i;
 641         struct ixgbe_fcoe *fcoe = &adapter->fcoe;
 642
 643         /* release ddp resource */
 644         if (fcoe->pool) {
 645                 for (i = 0; i < IXGBE_FCOE_DDP_MAX; i++)
 646                         ixgbe_fcoe_ddp_put(adapter->netdev, i);
 647                 dma_unmap_single(&adapter->pdev->dev,
 648                                  fcoe->extra_ddp_buffer_dma,
 649                                  IXGBE_FCBUFF_MIN,
 650                                  DMA_FROM_DEVICE);
 651                 kfree(fcoe->extra_ddp_buffer);
 652                 pci_pool_destroy(fcoe->pool);
 653                 fcoe->pool = NULL;
 654         }
 655 }
 656
 657 /**
 658  * ixgbe_fcoe_enable - turn on FCoE offload feature
 659  * @netdev: the corresponding netdev
 660  *
 661  * Turns on FCoE offload feature in 82599.
 662  *
 663  * Returns : 0 indicates success or -EINVAL on failure
 664  */
 665 int ixgbe_fcoe_enable(struct net_device *netdev)
 666 {
 667         int rc = -EINVAL;
 668         struct ixgbe_adapter *adapter = netdev_priv(netdev);
 669         struct ixgbe_fcoe *fcoe = &adapter->fcoe;
 670
 671
 672         if (!(adapter->flags & IXGBE_FLAG_FCOE_CAPABLE))
 673                 goto out_enable;
 674
 675         atomic_inc(&fcoe->refcnt);
 676         if (adapter->flags & IXGBE_FLAG_FCOE_ENABLED)
 677                 goto out_enable;
 678
 679         e_info(drv, "Enabling FCoE offload features.\n");
 680         if (netif_running(netdev))
 681                 netdev->netdev_ops->ndo_stop(netdev);
 682
 683         ixgbe_clear_interrupt_scheme(adapter);
 684
 685         adapter->flags |= IXGBE_FLAG_FCOE_ENABLED;
 686         adapter->ring_feature[RING_F_FCOE].indices = IXGBE_FCRETA_SIZE;
 687         netdev->features |= NETIF_F_FCOE_CRC;
 688         netdev->features |= NETIF_F_FSO;
 689         netdev->features |= NETIF_F_FCOE_MTU;
 690         netdev->fcoe_ddp_xid = IXGBE_FCOE_DDP_MAX - 1;
 691
 692         ixgbe_init_interrupt_scheme(adapter);
 693         netdev_features_change(netdev);
 694
 695         if (netif_running(netdev))
 696                 netdev->netdev_ops->ndo_open(netdev);
 697         rc = 0;
 698
 699 out_enable:
 700         return rc;
 701 }
 702
 703 /**
 704  * ixgbe_fcoe_disable - turn off FCoE offload feature
 705  * @netdev: the corresponding netdev
 706  *
 707  * Turns off FCoE offload feature in 82599.
 708  *
 709  * Returns : 0 indicates success or -EINVAL on failure
 710  */
 711 int ixgbe_fcoe_disable(struct net_device *netdev)
 712 {
 713         int rc = -EINVAL;
 714         struct ixgbe_adapter *adapter = netdev_priv(netdev);
 715         struct ixgbe_fcoe *fcoe = &adapter->fcoe;
 716
 717         if (!(adapter->flags & IXGBE_FLAG_FCOE_CAPABLE))
 718                 goto out_disable;
 719
 720         if (!(adapter->flags & IXGBE_FLAG_FCOE_ENABLED))
 721                 goto out_disable;
 722
 723         if (!atomic_dec_and_test(&fcoe->refcnt))
 724                 goto out_disable;
 725
 726         e_info(drv, "Disabling FCoE offload features.\n");
 727         netdev->features &= ~NETIF_F_FCOE_CRC;
 728         netdev->features &= ~NETIF_F_FSO;
 729         netdev->features &= ~NETIF_F_FCOE_MTU;
 730         netdev->fcoe_ddp_xid = 0;
 731         netdev_features_change(netdev);
 732
 733         if (netif_running(netdev))
 734                 netdev->netdev_ops->ndo_stop(netdev);
 735
 736         ixgbe_clear_interrupt_scheme(adapter);
 737         adapter->flags &= ~IXGBE_FLAG_FCOE_ENABLED;
 738         adapter->ring_feature[RING_F_FCOE].indices = 0;
 739         ixgbe_cleanup_fcoe(adapter);
 740         ixgbe_init_interrupt_scheme(adapter);
 741
 742         if (netif_running(netdev))
 743                 netdev->netdev_ops->ndo_open(netdev);
 744         rc = 0;
 745
 746 out_disable:
 747         return rc;
 748 }
 749
 750 #ifdef CONFIG_IXGBE_DCB
 751 /**
 752  * ixgbe_fcoe_getapp - retrieves current user priority bitmap for FCoE
 753  * @adapter : ixgbe adapter
 754  *
 755  * Finds out the corresponding user priority bitmap from the current
 756  * traffic class that FCoE belongs to. Returns 0 as the invalid user
 757  * priority bitmap to indicate an error.
 758  *
 759  * Returns : 802.1p user priority bitmap for FCoE
 760  */
 761 u8 ixgbe_fcoe_getapp(struct ixgbe_adapter *adapter)
 762 {
 763         return 1 << adapter->fcoe.up;
 764 }
 765
 766 /**
 767  * ixgbe_fcoe_setapp - sets the user priority bitmap for FCoE
 768  * @adapter : ixgbe adapter
 769  * @up : 802.1p user priority bitmap
 770  *
 771  * Finds out the traffic class from the input user priority
 772  * bitmap for FCoE.
 773  *
 774  * Returns : 0 on success otherwise returns 1 on error
 775  */
 776 u8 ixgbe_fcoe_setapp(struct ixgbe_adapter *adapter, u8 up)
 777 {
 778         int i;
 779         u32 up2tc;
 780
 781         /* valid user priority bitmap must not be 0 */
 782         if (up) {
 783                 /* from user priority to the corresponding traffic class */
 784                 up2tc = IXGBE_READ_REG(&adapter->hw, IXGBE_RTTUP2TC);
 785                 for (i = 0; i < MAX_USER_PRIORITY; i++) {
 786                         if (up & (1 << i)) {
 787                                 up2tc >>= (i * IXGBE_RTTUP2TC_UP_SHIFT);
 788                                 up2tc &= (MAX_TRAFFIC_CLASS - 1);
 789                                 adapter->fcoe.tc = (u8)up2tc;
 790                                 adapter->fcoe.up = i;
 791                                 return 0;
 792                         }
 793                 }
 794         }
 795
 796         return 1;
 797 }
 798 #endif /* CONFIG_IXGBE_DCB */
 799
 800 /**
 801  * ixgbe_fcoe_get_wwn - get world wide name for the node or the port
 802  * @netdev : ixgbe adapter
 803  * @wwn : the world wide name
 804  * @type: the type of world wide name
 805  *
 806  * Returns the node or port world wide name if both the prefix and the san
 807  * mac address are valid, then the wwn is formed based on the NAA-2 for
 808  * IEEE Extended name identifier (ref. to T10 FC-LS Spec., Sec. 15.3).
 809  *
 810  * Returns : 0 on success
 811  */
 812 int ixgbe_fcoe_get_wwn(struct net_device *netdev, u64 *wwn, int type)
 813 {
 814         int rc = -EINVAL;
 815         u16 prefix = 0xffff;
 816         struct ixgbe_adapter *adapter = netdev_priv(netdev);
 817         struct ixgbe_mac_info *mac = &adapter->hw.mac;
 818
 819         switch (type) {
 820         case NETDEV_FCOE_WWNN:
 821                 prefix = mac->wwnn_prefix;
 822                 break;
 823         case NETDEV_FCOE_WWPN:
 824                 prefix = mac->wwpn_prefix;
 825                 break;
 826         default:
 827                 break;
 828         }
 829
 830         if ((prefix != 0xffff) &&
 831             is_valid_ether_addr(mac->san_addr)) {
 832                 *wwn = ((u64) prefix << 48) |
 833                        ((u64) mac->san_addr[0] << 40) |
 834                        ((u64) mac->san_addr[1] << 32) |
 835                        ((u64) mac->san_addr[2] << 24) |
 836                        ((u64) mac->san_addr[3] << 16) |
 837                        ((u64) mac->san_addr[4] << 8)  |
 838                        ((u64) mac->san_addr[5]);
 839                 rc = 0;
 840         }
 841         return rc;
 842 }
 843
 844