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

   1 /*******************************************************************************
   2
   3   Intel 10 Gigabit PCI Express Linux driver
   4   Copyright(c) 1999 - 2014 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   Linux NICS <linux.nics@intel.com>
  24   e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  25   Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  26
  27 *******************************************************************************/
  28
  29 #include "ixgbe.h"
  30 #include <linux/if_ether.h>
  31 #include <linux/gfp.h>
  32 #include <linux/if_vlan.h>
  33 #include <scsi/scsi_cmnd.h>
  34 #include <scsi/scsi_device.h>
  35 #include <scsi/fc/fc_fs.h>
  36 #include <scsi/fc/fc_fcoe.h>
  37 #include <scsi/libfc.h>
  38 #include <scsi/libfcoe.h>
  39
  40 /**
  41  * ixgbe_fcoe_clear_ddp - clear the given ddp context
  42  * @ddp: ptr to the ixgbe_fcoe_ddp
  43  *
  44  * Returns : none
  45  *
  46  */
  47 static inline void ixgbe_fcoe_clear_ddp(struct ixgbe_fcoe_ddp *ddp)
  48 {
  49         ddp->len = 0;
  50         ddp->err = 1;
  51         ddp->udl = NULL;
  52         ddp->udp = 0UL;
  53         ddp->sgl = NULL;
  54         ddp->sgc = 0;
  55 }
  56
  57 /**
  58  * ixgbe_fcoe_ddp_put - free the ddp context for a given xid
  59  * @netdev: the corresponding net_device
  60  * @xid: the xid that corresponding ddp will be freed
  61  *
  62  * This is the implementation of net_device_ops.ndo_fcoe_ddp_done
  63  * and it is expected to be called by ULD, i.e., FCP layer of libfc
  64  * to release the corresponding ddp context when the I/O is done.
  65  *
  66  * Returns : data length already ddp-ed in bytes
  67  */
  68 int ixgbe_fcoe_ddp_put(struct net_device *netdev, u16 xid)
  69 {
  70         int len;
  71         struct ixgbe_fcoe *fcoe;
  72         struct ixgbe_adapter *adapter;
  73         struct ixgbe_fcoe_ddp *ddp;
  74         struct ixgbe_hw *hw;
  75         u32 fcbuff;
  76
  77         if (!netdev)
  78                 return 0;
  79
  80         if (xid >= netdev->fcoe_ddp_xid)
  81                 return 0;
  82
  83         adapter = netdev_priv(netdev);
  84         fcoe = &adapter->fcoe;
  85         ddp = &fcoe->ddp[xid];
  86         if (!ddp->udl)
  87                 return 0;
  88
  89         hw = &adapter->hw;
  90         len = ddp->len;
  91         /* if no error then skip ddp context invalidation */
  92         if (!ddp->err)
  93                 goto skip_ddpinv;
  94
  95         if (hw->mac.type == ixgbe_mac_X550) {
  96                 /* X550 does not require DDP FCoE lock */
  97
  98                 IXGBE_WRITE_REG(hw, IXGBE_FCDFC(0, xid), 0);
  99                 IXGBE_WRITE_REG(hw, IXGBE_FCDFC(3, xid),
 100                                 (xid | IXGBE_FCFLTRW_WE));
 101
 102                 /* program FCBUFF */
 103                 IXGBE_WRITE_REG(hw, IXGBE_FCDDC(2, xid), 0);
 104
 105                 /* program FCDMARW */
 106                 IXGBE_WRITE_REG(hw, IXGBE_FCDDC(3, xid),
 107                                 (xid | IXGBE_FCDMARW_WE));
 108
 109                 /* read FCBUFF to check context invalidated */
 110                 IXGBE_WRITE_REG(hw, IXGBE_FCDDC(3, xid),
 111                                 (xid | IXGBE_FCDMARW_RE));
 112                 fcbuff = IXGBE_READ_REG(hw, IXGBE_FCDDC(2, xid));
 113         } else {
 114                 /* other hardware requires DDP FCoE lock */
 115                 spin_lock_bh(&fcoe->lock);
 116                 IXGBE_WRITE_REG(hw, IXGBE_FCFLT, 0);
 117                 IXGBE_WRITE_REG(hw, IXGBE_FCFLTRW,
 118                                 (xid | IXGBE_FCFLTRW_WE));
 119                 IXGBE_WRITE_REG(hw, IXGBE_FCBUFF, 0);
 120                 IXGBE_WRITE_REG(hw, IXGBE_FCDMARW,
 121                                 (xid | IXGBE_FCDMARW_WE));
 122
 123                 /* guaranteed to be invalidated after 100us */
 124                 IXGBE_WRITE_REG(hw, IXGBE_FCDMARW,
 125                                 (xid | IXGBE_FCDMARW_RE));
 126                 fcbuff = IXGBE_READ_REG(hw, IXGBE_FCBUFF);
 127                 spin_unlock_bh(&fcoe->lock);
 128                 }
 129
 130         if (fcbuff & IXGBE_FCBUFF_VALID)
 131                 usleep_range(100, 150);
 132
 133 skip_ddpinv:
 134         if (ddp->sgl)
 135                 dma_unmap_sg(&adapter->pdev->dev, ddp->sgl, ddp->sgc,
 136                              DMA_FROM_DEVICE);
 137         if (ddp->pool) {
 138                 dma_pool_free(ddp->pool, ddp->udl, ddp->udp);
 139                 ddp->pool = NULL;
 140         }
 141
 142         ixgbe_fcoe_clear_ddp(ddp);
 143
 144         return len;
 145 }
 146
 147 /**
 148  * ixgbe_fcoe_ddp_setup - called to set up ddp context
 149  * @netdev: the corresponding net_device
 150  * @xid: the exchange id requesting ddp
 151  * @sgl: the scatter-gather list for this request
 152  * @sgc: the number of scatter-gather items
 153  *
 154  * Returns : 1 for success and 0 for no ddp
 155  */
 156 static int ixgbe_fcoe_ddp_setup(struct net_device *netdev, u16 xid,
 157                                 struct scatterlist *sgl, unsigned int sgc,
 158                                 int target_mode)
 159 {
 160         struct ixgbe_adapter *adapter;
 161         struct ixgbe_hw *hw;
 162         struct ixgbe_fcoe *fcoe;
 163         struct ixgbe_fcoe_ddp *ddp;
 164         struct ixgbe_fcoe_ddp_pool *ddp_pool;
 165         struct scatterlist *sg;
 166         unsigned int i, j, dmacount;
 167         unsigned int len;
 168         static const unsigned int bufflen = IXGBE_FCBUFF_MIN;
 169         unsigned int firstoff = 0;
 170         unsigned int lastsize;
 171         unsigned int thisoff = 0;
 172         unsigned int thislen = 0;
 173         u32 fcbuff, fcdmarw, fcfltrw, fcrxctl;
 174         dma_addr_t addr = 0;
 175
 176         if (!netdev || !sgl)
 177                 return 0;
 178
 179         adapter = netdev_priv(netdev);
 180         if (xid >= netdev->fcoe_ddp_xid) {
 181                 e_warn(drv, "xid=0x%x out-of-range\n", xid);
 182                 return 0;
 183         }
 184
 185         /* no DDP if we are already down or resetting */
 186         if (test_bit(__IXGBE_DOWN, &adapter->state) ||
 187             test_bit(__IXGBE_RESETTING, &adapter->state))
 188                 return 0;
 189
 190         fcoe = &adapter->fcoe;
 191         ddp = &fcoe->ddp[xid];
 192         if (ddp->sgl) {
 193                 e_err(drv, "xid 0x%x w/ non-null sgl=%p nents=%d\n",
 194                       xid, ddp->sgl, ddp->sgc);
 195                 return 0;
 196         }
 197         ixgbe_fcoe_clear_ddp(ddp);
 198
 199
 200         if (!fcoe->ddp_pool) {
 201                 e_warn(drv, "No ddp_pool resources allocated\n");
 202                 return 0;
 203         }
 204
 205         ddp_pool = per_cpu_ptr(fcoe->ddp_pool, get_cpu());
 206         if (!ddp_pool->pool) {
 207                 e_warn(drv, "xid=0x%x no ddp pool for fcoe\n", xid);
 208                 goto out_noddp;
 209         }
 210
 211         /* setup dma from scsi command sgl */
 212         dmacount = dma_map_sg(&adapter->pdev->dev, sgl, sgc, DMA_FROM_DEVICE);
 213         if (dmacount == 0) {
 214                 e_err(drv, "xid 0x%x DMA map error\n", xid);
 215                 goto out_noddp;
 216         }
 217
 218         /* alloc the udl from per cpu ddp pool */
 219         ddp->udl = dma_pool_alloc(ddp_pool->pool, GFP_ATOMIC, &ddp->udp);
 220         if (!ddp->udl) {
 221                 e_err(drv, "failed allocated ddp context\n");
 222                 goto out_noddp_unmap;
 223         }
 224         ddp->pool = ddp_pool->pool;
 225         ddp->sgl = sgl;
 226         ddp->sgc = sgc;
 227
 228         j = 0;
 229         for_each_sg(sgl, sg, dmacount, i) {
 230                 addr = sg_dma_address(sg);
 231                 len = sg_dma_len(sg);
 232                 while (len) {
 233                         /* max number of buffers allowed in one DDP context */
 234                         if (j >= IXGBE_BUFFCNT_MAX) {
 235                                 ddp_pool->noddp++;
 236                                 goto out_noddp_free;
 237                         }
 238
 239                         /* get the offset of length of current buffer */
 240                         thisoff = addr & ((dma_addr_t)bufflen - 1);
 241                         thislen = min((bufflen - thisoff), len);
 242                         /*
 243                          * all but the 1st buffer (j == 0)
 244                          * must be aligned on bufflen
 245                          */
 246                         if ((j != 0) && (thisoff))
 247                                 goto out_noddp_free;
 248                         /*
 249                          * all but the last buffer
 250                          * ((i == (dmacount - 1)) && (thislen == len))
 251                          * must end at bufflen
 252                          */
 253                         if (((i != (dmacount - 1)) || (thislen != len))
 254                             && ((thislen + thisoff) != bufflen))
 255                                 goto out_noddp_free;
 256
 257                         ddp->udl[j] = (u64)(addr - thisoff);
 258                         /* only the first buffer may have none-zero offset */
 259                         if (j == 0)
 260                                 firstoff = thisoff;
 261                         len -= thislen;
 262                         addr += thislen;
 263                         j++;
 264                 }
 265         }
 266         /* only the last buffer may have non-full bufflen */
 267         lastsize = thisoff + thislen;
 268
 269         /*
 270          * lastsize can not be buffer len.
 271          * If it is then adding another buffer with lastsize = 1.
 272          */
 273         if (lastsize == bufflen) {
 274                 if (j >= IXGBE_BUFFCNT_MAX) {
 275                         ddp_pool->noddp_ext_buff++;
 276                         goto out_noddp_free;
 277                 }
 278
 279                 ddp->udl[j] = (u64)(fcoe->extra_ddp_buffer_dma);
 280                 j++;
 281                 lastsize = 1;
 282         }
 283         put_cpu();
 284
 285         fcbuff = (IXGBE_FCBUFF_4KB << IXGBE_FCBUFF_BUFFSIZE_SHIFT);
 286         fcbuff |= ((j & 0xff) << IXGBE_FCBUFF_BUFFCNT_SHIFT);
 287         fcbuff |= (firstoff << IXGBE_FCBUFF_OFFSET_SHIFT);
 288         /* Set WRCONTX bit to allow DDP for target */
 289         if (target_mode)
 290                 fcbuff |= (IXGBE_FCBUFF_WRCONTX);
 291         fcbuff |= (IXGBE_FCBUFF_VALID);
 292
 293         fcdmarw = xid;
 294         fcdmarw |= IXGBE_FCDMARW_WE;
 295         fcdmarw |= (lastsize << IXGBE_FCDMARW_LASTSIZE_SHIFT);
 296
 297         fcfltrw = xid;
 298         fcfltrw |= IXGBE_FCFLTRW_WE;
 299
 300         /* program DMA context */
 301         hw = &adapter->hw;
 302
 303         /* turn on last frame indication for target mode as FCP_RSPtarget is
 304          * supposed to send FCP_RSP when it is done. */
 305         if (target_mode && !test_bit(__IXGBE_FCOE_TARGET, &fcoe->mode)) {
 306                 set_bit(__IXGBE_FCOE_TARGET, &fcoe->mode);
 307                 fcrxctl = IXGBE_READ_REG(hw, IXGBE_FCRXCTRL);
 308                 fcrxctl |= IXGBE_FCRXCTRL_LASTSEQH;
 309                 IXGBE_WRITE_REG(hw, IXGBE_FCRXCTRL, fcrxctl);
 310         }
 311
 312         if (hw->mac.type == ixgbe_mac_X550) {
 313                 /* X550 does not require DDP lock */
 314
 315                 IXGBE_WRITE_REG(hw, IXGBE_FCDDC(0, xid),
 316                                 ddp->udp & DMA_BIT_MASK(32));
 317                 IXGBE_WRITE_REG(hw, IXGBE_FCDDC(1, xid), (u64)ddp->udp >> 32);
 318                 IXGBE_WRITE_REG(hw, IXGBE_FCDDC(2, xid), fcbuff);
 319                 IXGBE_WRITE_REG(hw, IXGBE_FCDDC(3, xid), fcdmarw);
 320                 /* program filter context */
 321                 IXGBE_WRITE_REG(hw, IXGBE_FCDFC(0, xid), IXGBE_FCFLT_VALID);
 322                 IXGBE_WRITE_REG(hw, IXGBE_FCDFC(1, xid), 0);
 323                 IXGBE_WRITE_REG(hw, IXGBE_FCDFC(3, xid), fcfltrw);
 324         } else {
 325                 /* DDP lock for indirect DDP context access */
 326                 spin_lock_bh(&fcoe->lock);
 327
 328                 IXGBE_WRITE_REG(hw, IXGBE_FCPTRL, ddp->udp & DMA_BIT_MASK(32));
 329                 IXGBE_WRITE_REG(hw, IXGBE_FCPTRH, (u64)ddp->udp >> 32);
 330                 IXGBE_WRITE_REG(hw, IXGBE_FCBUFF, fcbuff);
 331                 IXGBE_WRITE_REG(hw, IXGBE_FCDMARW, fcdmarw);
 332                 /* program filter context */
 333                 IXGBE_WRITE_REG(hw, IXGBE_FCPARAM, 0);
 334                 IXGBE_WRITE_REG(hw, IXGBE_FCFLT, IXGBE_FCFLT_VALID);
 335                 IXGBE_WRITE_REG(hw, IXGBE_FCFLTRW, fcfltrw);
 336
 337                 spin_unlock_bh(&fcoe->lock);
 338         }
 339
 340         return 1;
 341
 342 out_noddp_free:
 343         dma_pool_free(ddp->pool, ddp->udl, ddp->udp);
 344         ixgbe_fcoe_clear_ddp(ddp);
 345
 346 out_noddp_unmap:
 347         dma_unmap_sg(&adapter->pdev->dev, sgl, sgc, DMA_FROM_DEVICE);
 348 out_noddp:
 349         put_cpu();
 350         return 0;
 351 }
 352
 353 /**
 354  * ixgbe_fcoe_ddp_get - called to set up ddp context in initiator mode
 355  * @netdev: the corresponding net_device
 356  * @xid: the exchange id requesting ddp
 357  * @sgl: the scatter-gather list for this request
 358  * @sgc: the number of scatter-gather items
 359  *
 360  * This is the implementation of net_device_ops.ndo_fcoe_ddp_setup
 361  * and is expected to be called from ULD, e.g., FCP layer of libfc
 362  * to set up ddp for the corresponding xid of the given sglist for
 363  * the corresponding I/O.
 364  *
 365  * Returns : 1 for success and 0 for no ddp
 366  */
 367 int ixgbe_fcoe_ddp_get(struct net_device *netdev, u16 xid,
 368                        struct scatterlist *sgl, unsigned int sgc)
 369 {
 370         return ixgbe_fcoe_ddp_setup(netdev, xid, sgl, sgc, 0);
 371 }
 372
 373 /**
 374  * ixgbe_fcoe_ddp_target - called to set up ddp context in target mode
 375  * @netdev: the corresponding net_device
 376  * @xid: the exchange id requesting ddp
 377  * @sgl: the scatter-gather list for this request
 378  * @sgc: the number of scatter-gather items
 379  *
 380  * This is the implementation of net_device_ops.ndo_fcoe_ddp_target
 381  * and is expected to be called from ULD, e.g., FCP layer of libfc
 382  * to set up ddp for the corresponding xid of the given sglist for
 383  * the corresponding I/O. The DDP in target mode is a write I/O request
 384  * from the initiator.
 385  *
 386  * Returns : 1 for success and 0 for no ddp
 387  */
 388 int ixgbe_fcoe_ddp_target(struct net_device *netdev, u16 xid,
 389                             struct scatterlist *sgl, unsigned int sgc)
 390 {
 391         return ixgbe_fcoe_ddp_setup(netdev, xid, sgl, sgc, 1);
 392 }
 393
 394 /**
 395  * ixgbe_fcoe_ddp - check ddp status and mark it done
 396  * @adapter: ixgbe adapter
 397  * @rx_desc: advanced rx descriptor
 398  * @skb: the skb holding the received data
 399  *
 400  * This checks ddp status.
 401  *
 402  * Returns : < 0 indicates an error or not a FCiE ddp, 0 indicates
 403  * not passing the skb to ULD, > 0 indicates is the length of data
 404  * being ddped.
 405  */
 406 int ixgbe_fcoe_ddp(struct ixgbe_adapter *adapter,
 407                    union ixgbe_adv_rx_desc *rx_desc,
 408                    struct sk_buff *skb)
 409 {
 410         int rc = -EINVAL;
 411         struct ixgbe_fcoe *fcoe;
 412         struct ixgbe_fcoe_ddp *ddp;
 413         struct fc_frame_header *fh;
 414         struct fcoe_crc_eof *crc;
 415         __le32 fcerr = ixgbe_test_staterr(rx_desc, IXGBE_RXDADV_ERR_FCERR);
 416         __le32 ddp_err;
 417         int ddp_max;
 418         u32 fctl;
 419         u16 xid;
 420
 421         if (fcerr == cpu_to_le32(IXGBE_FCERR_BADCRC))
 422                 skb->ip_summed = CHECKSUM_NONE;
 423         else
 424                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 425
 426         if (eth_hdr(skb)->h_proto == htons(ETH_P_8021Q))
 427                 fh = (struct fc_frame_header *)(skb->data +
 428                         sizeof(struct vlan_hdr) + sizeof(struct fcoe_hdr));
 429         else
 430                 fh = (struct fc_frame_header *)(skb->data +
 431                         sizeof(struct fcoe_hdr));
 432
 433         fctl = ntoh24(fh->fh_f_ctl);
 434         if (fctl & FC_FC_EX_CTX)
 435                 xid =  be16_to_cpu(fh->fh_ox_id);
 436         else
 437                 xid =  be16_to_cpu(fh->fh_rx_id);
 438
 439         ddp_max = IXGBE_FCOE_DDP_MAX;
 440         /* X550 has different DDP Max limit */
 441         if (adapter->hw.mac.type == ixgbe_mac_X550)
 442                 ddp_max = IXGBE_FCOE_DDP_MAX_X550;
 443         if (xid >= ddp_max)
 444                 return -EINVAL;
 445
 446         fcoe = &adapter->fcoe;
 447         ddp = &fcoe->ddp[xid];
 448         if (!ddp->udl)
 449                 return -EINVAL;
 450
 451         ddp_err = ixgbe_test_staterr(rx_desc, IXGBE_RXDADV_ERR_FCEOFE |
 452                                               IXGBE_RXDADV_ERR_FCERR);
 453         if (ddp_err)
 454                 return -EINVAL;
 455
 456         switch (ixgbe_test_staterr(rx_desc, IXGBE_RXDADV_STAT_FCSTAT)) {
 457         /* return 0 to bypass going to ULD for DDPed data */
 458         case cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_DDP):
 459                 /* update length of DDPed data */
 460                 ddp->len = le32_to_cpu(rx_desc->wb.lower.hi_dword.rss);
 461                 rc = 0;
 462                 break;
 463         /* unmap the sg list when FCPRSP is received */
 464         case cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_FCPRSP):
 465                 dma_unmap_sg(&adapter->pdev->dev, ddp->sgl,
 466                              ddp->sgc, DMA_FROM_DEVICE);
 467                 ddp->err = ddp_err;
 468                 ddp->sgl = NULL;
 469                 ddp->sgc = 0;
 470                 /* fall through */
 471         /* if DDP length is present pass it through to ULD */
 472         case cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_NODDP):
 473                 /* update length of DDPed data */
 474                 ddp->len = le32_to_cpu(rx_desc->wb.lower.hi_dword.rss);
 475                 if (ddp->len)
 476                         rc = ddp->len;
 477                 break;
 478         /* no match will return as an error */
 479         case cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_NOMTCH):
 480         default:
 481                 break;
 482         }
 483
 484         /* In target mode, check the last data frame of the sequence.
 485          * For DDP in target mode, data is already DDPed but the header
 486          * indication of the last data frame ould allow is to tell if we
 487          * got all the data and the ULP can send FCP_RSP back, as this is
 488          * not a full fcoe frame, we fill the trailer here so it won't be
 489          * dropped by the ULP stack.
 490          */
 491         if ((fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA) &&
 492             (fctl & FC_FC_END_SEQ)) {
 493                 skb_linearize(skb);
 494                 crc = (struct fcoe_crc_eof *)skb_put(skb, sizeof(*crc));
 495                 crc->fcoe_eof = FC_EOF_T;
 496         }
 497
 498         return rc;
 499 }
 500
 501 /**
 502  * ixgbe_fso - ixgbe FCoE Sequence Offload (FSO)
 503  * @tx_ring: tx desc ring
 504  * @first: first tx_buffer structure containing skb, tx_flags, and protocol
 505  * @hdr_len: hdr_len to be returned
 506  *
 507  * This sets up large send offload for FCoE
 508  *
 509  * Returns : 0 indicates success, < 0 for error
 510  */
 511 int ixgbe_fso(struct ixgbe_ring *tx_ring,
 512               struct ixgbe_tx_buffer *first,
 513               u8 *hdr_len)
 514 {
 515         struct sk_buff *skb = first->skb;
 516         struct fc_frame_header *fh;
 517         u32 vlan_macip_lens;
 518         u32 fcoe_sof_eof = 0;
 519         u32 mss_l4len_idx;
 520         u32 type_tucmd = IXGBE_ADVTXT_TUCMD_FCOE;
 521         u8 sof, eof;
 522
 523         if (skb_is_gso(skb) && (skb_shinfo(skb)->gso_type != SKB_GSO_FCOE)) {
 524                 dev_err(tx_ring->dev, "Wrong gso type %d:expecting SKB_GSO_FCOE\n",
 525                         skb_shinfo(skb)->gso_type);
 526                 return -EINVAL;
 527         }
 528
 529         /* resets the header to point fcoe/fc */
 530         skb_set_network_header(skb, skb->mac_len);
 531         skb_set_transport_header(skb, skb->mac_len +
 532                                  sizeof(struct fcoe_hdr));
 533
 534         /* sets up SOF and ORIS */
 535         sof = ((struct fcoe_hdr *)skb_network_header(skb))->fcoe_sof;
 536         switch (sof) {
 537         case FC_SOF_I2:
 538                 fcoe_sof_eof = IXGBE_ADVTXD_FCOEF_ORIS;
 539                 break;
 540         case FC_SOF_I3:
 541                 fcoe_sof_eof = IXGBE_ADVTXD_FCOEF_SOF |
 542                                IXGBE_ADVTXD_FCOEF_ORIS;
 543                 break;
 544         case FC_SOF_N2:
 545                 break;
 546         case FC_SOF_N3:
 547                 fcoe_sof_eof = IXGBE_ADVTXD_FCOEF_SOF;
 548                 break;
 549         default:
 550                 dev_warn(tx_ring->dev, "unknown sof = 0x%x\n", sof);
 551                 return -EINVAL;
 552         }
 553
 554         /* the first byte of the last dword is EOF */
 555         skb_copy_bits(skb, skb->len - 4, &eof, 1);
 556         /* sets up EOF and ORIE */
 557         switch (eof) {
 558         case FC_EOF_N:
 559                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_N;
 560                 break;
 561         case FC_EOF_T:
 562                 /* lso needs ORIE */
 563                 if (skb_is_gso(skb))
 564                         fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_N |
 565                                         IXGBE_ADVTXD_FCOEF_ORIE;
 566                 else
 567                         fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_T;
 568                 break;
 569         case FC_EOF_NI:
 570                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_NI;
 571                 break;
 572         case FC_EOF_A:
 573                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_A;
 574                 break;
 575         default:
 576                 dev_warn(tx_ring->dev, "unknown eof = 0x%x\n", eof);
 577                 return -EINVAL;
 578         }
 579
 580         /* sets up PARINC indicating data offset */
 581         fh = (struct fc_frame_header *)skb_transport_header(skb);
 582         if (fh->fh_f_ctl[2] & FC_FC_REL_OFF)
 583                 fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_PARINC;
 584
 585         /* include trailer in headlen as it is replicated per frame */
 586         *hdr_len = sizeof(struct fcoe_crc_eof);
 587
 588         /* hdr_len includes fc_hdr if FCoE LSO is enabled */
 589         if (skb_is_gso(skb)) {
 590                 *hdr_len += skb_transport_offset(skb) +
 591                             sizeof(struct fc_frame_header);
 592                 /* update gso_segs and bytecount */
 593                 first->gso_segs = DIV_ROUND_UP(skb->len - *hdr_len,
 594                                                skb_shinfo(skb)->gso_size);
 595                 first->bytecount += (first->gso_segs - 1) * *hdr_len;
 596                 first->tx_flags |= IXGBE_TX_FLAGS_TSO;
 597                 /* Hardware expects L4T to be RSV for FCoE TSO */
 598                 type_tucmd |= IXGBE_ADVTXD_TUCMD_L4T_RSV;
 599         }
 600
 601         /* set flag indicating FCOE to ixgbe_tx_map call */
 602         first->tx_flags |= IXGBE_TX_FLAGS_FCOE | IXGBE_TX_FLAGS_CC;
 603
 604         /* mss_l4len_id: use 0 for FSO as TSO, no need for L4LEN */
 605         mss_l4len_idx = skb_shinfo(skb)->gso_size << IXGBE_ADVTXD_MSS_SHIFT;
 606
 607         /* vlan_macip_lens: HEADLEN, MACLEN, VLAN tag */
 608         vlan_macip_lens = skb_transport_offset(skb) +
 609                           sizeof(struct fc_frame_header);
 610         vlan_macip_lens |= (skb_transport_offset(skb) - 4)
 611                            << IXGBE_ADVTXD_MACLEN_SHIFT;
 612         vlan_macip_lens |= first->tx_flags & IXGBE_TX_FLAGS_VLAN_MASK;
 613
 614         /* write context desc */
 615         ixgbe_tx_ctxtdesc(tx_ring, vlan_macip_lens, fcoe_sof_eof,
 616                           type_tucmd, mss_l4len_idx);
 617
 618         return 0;
 619 }
 620
 621 static void ixgbe_fcoe_dma_pool_free(struct ixgbe_fcoe *fcoe, unsigned int cpu)
 622 {
 623         struct ixgbe_fcoe_ddp_pool *ddp_pool;
 624
 625         ddp_pool = per_cpu_ptr(fcoe->ddp_pool, cpu);
 626         dma_pool_destroy(ddp_pool->pool);
 627         ddp_pool->pool = NULL;
 628 }
 629
 630 static int ixgbe_fcoe_dma_pool_alloc(struct ixgbe_fcoe *fcoe,
 631                                      struct device *dev,
 632                                      unsigned int cpu)
 633 {
 634         struct ixgbe_fcoe_ddp_pool *ddp_pool;
 635         struct dma_pool *pool;
 636         char pool_name[32];
 637
 638         snprintf(pool_name, 32, "ixgbe_fcoe_ddp_%u", cpu);
 639
 640         pool = dma_pool_create(pool_name, dev, IXGBE_FCPTR_MAX,
 641                                IXGBE_FCPTR_ALIGN, PAGE_SIZE);
 642         if (!pool)
 643                 return -ENOMEM;
 644
 645         ddp_pool = per_cpu_ptr(fcoe->ddp_pool, cpu);
 646         ddp_pool->pool = pool;
 647         ddp_pool->noddp = 0;
 648         ddp_pool->noddp_ext_buff = 0;
 649
 650         return 0;
 651 }
 652
 653 /**
 654  * ixgbe_configure_fcoe - configures registers for fcoe at start
 655  * @adapter: ptr to ixgbe adapter
 656  *
 657  * This sets up FCoE related registers
 658  *
 659  * Returns : none
 660  */
 661 void ixgbe_configure_fcoe(struct ixgbe_adapter *adapter)
 662 {
 663         struct ixgbe_ring_feature *fcoe = &adapter->ring_feature[RING_F_FCOE];
 664         struct ixgbe_hw *hw = &adapter->hw;
 665         int i, fcoe_q, fcoe_i, fcoe_q_h = 0;
 666         int fcreta_size;
 667         u32 etqf;
 668
 669         /* Minimal functionality for FCoE requires at least CRC offloads */
 670         if (!(adapter->netdev->features & NETIF_F_FCOE_CRC))
 671                 return;
 672
 673         /* Enable L2 EtherType filter for FCoE, needed for FCoE CRC and DDP */
 674         etqf = ETH_P_FCOE | IXGBE_ETQF_FCOE | IXGBE_ETQF_FILTER_EN;
 675         if (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED) {
 676                 etqf |= IXGBE_ETQF_POOL_ENABLE;
 677                 etqf |= VMDQ_P(0) << IXGBE_ETQF_POOL_SHIFT;
 678         }
 679         IXGBE_WRITE_REG(hw, IXGBE_ETQF(IXGBE_ETQF_FILTER_FCOE), etqf);
 680         IXGBE_WRITE_REG(hw, IXGBE_ETQS(IXGBE_ETQF_FILTER_FCOE), 0);
 681
 682         /* leave registers un-configured if FCoE is disabled */
 683         if (!(adapter->flags & IXGBE_FLAG_FCOE_ENABLED))
 684                 return;
 685
 686         /* Use one or more Rx queues for FCoE by redirection table */
 687         fcreta_size = IXGBE_FCRETA_SIZE;
 688         if (adapter->hw.mac.type == ixgbe_mac_X550)
 689                 fcreta_size = IXGBE_FCRETA_SIZE_X550;
 690
 691         for (i = 0; i < fcreta_size; i++) {
 692                 if (adapter->hw.mac.type == ixgbe_mac_X550) {
 693                         int fcoe_i_h = fcoe->offset + ((i + fcreta_size) %
 694                                                         fcoe->indices);
 695                         fcoe_q_h = adapter->rx_ring[fcoe_i_h]->reg_idx;
 696                         fcoe_q_h = (fcoe_q_h << IXGBE_FCRETA_ENTRY_HIGH_SHIFT) &
 697                                    IXGBE_FCRETA_ENTRY_HIGH_MASK;
 698                 }
 699
 700                 fcoe_i = fcoe->offset + (i % fcoe->indices);
 701                 fcoe_i &= IXGBE_FCRETA_ENTRY_MASK;
 702                 fcoe_q = adapter->rx_ring[fcoe_i]->reg_idx;
 703                 fcoe_q |= fcoe_q_h;
 704                 IXGBE_WRITE_REG(hw, IXGBE_FCRETA(i), fcoe_q);
 705         }
 706         IXGBE_WRITE_REG(hw, IXGBE_FCRECTL, IXGBE_FCRECTL_ENA);
 707
 708         /* Enable L2 EtherType filter for FIP */
 709         etqf = ETH_P_FIP | IXGBE_ETQF_FILTER_EN;
 710         if (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED) {
 711                 etqf |= IXGBE_ETQF_POOL_ENABLE;
 712                 etqf |= VMDQ_P(0) << IXGBE_ETQF_POOL_SHIFT;
 713         }
 714         IXGBE_WRITE_REG(hw, IXGBE_ETQF(IXGBE_ETQF_FILTER_FIP), etqf);
 715
 716         /* Send FIP frames to the first FCoE queue */
 717         fcoe_q = adapter->rx_ring[fcoe->offset]->reg_idx;
 718         IXGBE_WRITE_REG(hw, IXGBE_ETQS(IXGBE_ETQF_FILTER_FIP),
 719                         IXGBE_ETQS_QUEUE_EN |
 720                         (fcoe_q << IXGBE_ETQS_RX_QUEUE_SHIFT));
 721
 722         /* Configure FCoE Rx control */
 723         IXGBE_WRITE_REG(hw, IXGBE_FCRXCTRL,
 724                         IXGBE_FCRXCTRL_FCCRCBO |
 725                         (FC_FCOE_VER << IXGBE_FCRXCTRL_FCOEVER_SHIFT));
 726 }
 727
 728 /**
 729  * ixgbe_free_fcoe_ddp_resources - release all fcoe ddp context resources
 730  * @adapter : ixgbe adapter
 731  *
 732  * Cleans up outstanding ddp context resources
 733  *
 734  * Returns : none
 735  */
 736 void ixgbe_free_fcoe_ddp_resources(struct ixgbe_adapter *adapter)
 737 {
 738         struct ixgbe_fcoe *fcoe = &adapter->fcoe;
 739         int cpu, i, ddp_max;
 740
 741         /* do nothing if no DDP pools were allocated */
 742         if (!fcoe->ddp_pool)
 743                 return;
 744
 745         ddp_max = IXGBE_FCOE_DDP_MAX;
 746         /* X550 has different DDP Max limit */
 747         if (adapter->hw.mac.type == ixgbe_mac_X550)
 748                 ddp_max = IXGBE_FCOE_DDP_MAX_X550;
 749
 750         for (i = 0; i < ddp_max; i++)
 751                 ixgbe_fcoe_ddp_put(adapter->netdev, i);
 752
 753         for_each_possible_cpu(cpu)
 754                 ixgbe_fcoe_dma_pool_free(fcoe, cpu);
 755
 756         dma_unmap_single(&adapter->pdev->dev,
 757                          fcoe->extra_ddp_buffer_dma,
 758                          IXGBE_FCBUFF_MIN,
 759                          DMA_FROM_DEVICE);
 760         kfree(fcoe->extra_ddp_buffer);
 761
 762         fcoe->extra_ddp_buffer = NULL;
 763         fcoe->extra_ddp_buffer_dma = 0;
 764 }
 765
 766 /**
 767  * ixgbe_setup_fcoe_ddp_resources - setup all fcoe ddp context resources
 768  * @adapter: ixgbe adapter
 769  *
 770  * Sets up ddp context resouces
 771  *
 772  * Returns : 0 indicates success or -EINVAL on failure
 773  */
 774 int ixgbe_setup_fcoe_ddp_resources(struct ixgbe_adapter *adapter)
 775 {
 776         struct ixgbe_fcoe *fcoe = &adapter->fcoe;
 777         struct device *dev = &adapter->pdev->dev;
 778         void *buffer;
 779         dma_addr_t dma;
 780         unsigned int cpu;
 781
 782         /* do nothing if no DDP pools were allocated */
 783         if (!fcoe->ddp_pool)
 784                 return 0;
 785
 786         /* Extra buffer to be shared by all DDPs for HW work around */
 787         buffer = kmalloc(IXGBE_FCBUFF_MIN, GFP_ATOMIC);
 788         if (!buffer)
 789                 return -ENOMEM;
 790
 791         dma = dma_map_single(dev, buffer, IXGBE_FCBUFF_MIN, DMA_FROM_DEVICE);
 792         if (dma_mapping_error(dev, dma)) {
 793                 e_err(drv, "failed to map extra DDP buffer\n");
 794                 kfree(buffer);
 795                 return -ENOMEM;
 796         }
 797
 798         fcoe->extra_ddp_buffer = buffer;
 799         fcoe->extra_ddp_buffer_dma = dma;
 800
 801         /* allocate pci pool for each cpu */
 802         for_each_possible_cpu(cpu) {
 803                 int err = ixgbe_fcoe_dma_pool_alloc(fcoe, dev, cpu);
 804                 if (!err)
 805                         continue;
 806
 807                 e_err(drv, "failed to alloc DDP pool on cpu:%d\n", cpu);
 808                 ixgbe_free_fcoe_ddp_resources(adapter);
 809                 return -ENOMEM;
 810         }
 811
 812         return 0;
 813 }
 814
 815 static int ixgbe_fcoe_ddp_enable(struct ixgbe_adapter *adapter)
 816 {
 817         struct ixgbe_fcoe *fcoe = &adapter->fcoe;
 818
 819         if (!(adapter->flags & IXGBE_FLAG_FCOE_CAPABLE))
 820                 return -EINVAL;
 821
 822         fcoe->ddp_pool = alloc_percpu(struct ixgbe_fcoe_ddp_pool);
 823
 824         if (!fcoe->ddp_pool) {
 825                 e_err(drv, "failed to allocate percpu DDP resources\n");
 826                 return -ENOMEM;
 827         }
 828
 829         adapter->netdev->fcoe_ddp_xid = IXGBE_FCOE_DDP_MAX - 1;
 830         /* X550 has different DDP Max limit */
 831         if (adapter->hw.mac.type == ixgbe_mac_X550)
 832                 adapter->netdev->fcoe_ddp_xid = IXGBE_FCOE_DDP_MAX_X550 - 1;
 833
 834         return 0;
 835 }
 836
 837 static void ixgbe_fcoe_ddp_disable(struct ixgbe_adapter *adapter)
 838 {
 839         struct ixgbe_fcoe *fcoe = &adapter->fcoe;
 840
 841         adapter->netdev->fcoe_ddp_xid = 0;
 842
 843         if (!fcoe->ddp_pool)
 844                 return;
 845
 846         free_percpu(fcoe->ddp_pool);
 847         fcoe->ddp_pool = NULL;
 848 }
 849
 850 /**
 851  * ixgbe_fcoe_enable - turn on FCoE offload feature
 852  * @netdev: the corresponding netdev
 853  *
 854  * Turns on FCoE offload feature in 82599.
 855  *
 856  * Returns : 0 indicates success or -EINVAL on failure
 857  */
 858 int ixgbe_fcoe_enable(struct net_device *netdev)
 859 {
 860         struct ixgbe_adapter *adapter = netdev_priv(netdev);
 861         struct ixgbe_fcoe *fcoe = &adapter->fcoe;
 862
 863         atomic_inc(&fcoe->refcnt);
 864
 865         if (!(adapter->flags & IXGBE_FLAG_FCOE_CAPABLE))
 866                 return -EINVAL;
 867
 868         if (adapter->flags & IXGBE_FLAG_FCOE_ENABLED)
 869                 return -EINVAL;
 870
 871         e_info(drv, "Enabling FCoE offload features.\n");
 872
 873         if (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED)
 874                 e_warn(probe, "Enabling FCoE on PF will disable legacy VFs\n");
 875
 876         if (netif_running(netdev))
 877                 netdev->netdev_ops->ndo_stop(netdev);
 878
 879         /* Allocate per CPU memory to track DDP pools */
 880         ixgbe_fcoe_ddp_enable(adapter);
 881
 882         /* enable FCoE and notify stack */
 883         adapter->flags |= IXGBE_FLAG_FCOE_ENABLED;
 884         netdev->features |= NETIF_F_FCOE_MTU;
 885         netdev_features_change(netdev);
 886
 887         /* release existing queues and reallocate them */
 888         ixgbe_clear_interrupt_scheme(adapter);
 889         ixgbe_init_interrupt_scheme(adapter);
 890
 891         if (netif_running(netdev))
 892                 netdev->netdev_ops->ndo_open(netdev);
 893
 894         return 0;
 895 }
 896
 897 /**
 898  * ixgbe_fcoe_disable - turn off FCoE offload feature
 899  * @netdev: the corresponding netdev
 900  *
 901  * Turns off FCoE offload feature in 82599.
 902  *
 903  * Returns : 0 indicates success or -EINVAL on failure
 904  */
 905 int ixgbe_fcoe_disable(struct net_device *netdev)
 906 {
 907         struct ixgbe_adapter *adapter = netdev_priv(netdev);
 908
 909         if (!atomic_dec_and_test(&adapter->fcoe.refcnt))
 910                 return -EINVAL;
 911
 912         if (!(adapter->flags & IXGBE_FLAG_FCOE_ENABLED))
 913                 return -EINVAL;
 914
 915         e_info(drv, "Disabling FCoE offload features.\n");
 916         if (netif_running(netdev))
 917                 netdev->netdev_ops->ndo_stop(netdev);
 918
 919         /* Free per CPU memory to track DDP pools */
 920         ixgbe_fcoe_ddp_disable(adapter);
 921
 922         /* disable FCoE and notify stack */
 923         adapter->flags &= ~IXGBE_FLAG_FCOE_ENABLED;
 924         netdev->features &= ~NETIF_F_FCOE_MTU;
 925
 926         netdev_features_change(netdev);
 927
 928         /* release existing queues and reallocate them */
 929         ixgbe_clear_interrupt_scheme(adapter);
 930         ixgbe_init_interrupt_scheme(adapter);
 931
 932         if (netif_running(netdev))
 933                 netdev->netdev_ops->ndo_open(netdev);
 934
 935         return 0;
 936 }
 937
 938 /**
 939  * ixgbe_fcoe_get_wwn - get world wide name for the node or the port
 940  * @netdev : ixgbe adapter
 941  * @wwn : the world wide name
 942  * @type: the type of world wide name
 943  *
 944  * Returns the node or port world wide name if both the prefix and the san
 945  * mac address are valid, then the wwn is formed based on the NAA-2 for
 946  * IEEE Extended name identifier (ref. to T10 FC-LS Spec., Sec. 15.3).
 947  *
 948  * Returns : 0 on success
 949  */
 950 int ixgbe_fcoe_get_wwn(struct net_device *netdev, u64 *wwn, int type)
 951 {
 952         u16 prefix = 0xffff;
 953         struct ixgbe_adapter *adapter = netdev_priv(netdev);
 954         struct ixgbe_mac_info *mac = &adapter->hw.mac;
 955
 956         switch (type) {
 957         case NETDEV_FCOE_WWNN:
 958                 prefix = mac->wwnn_prefix;
 959                 break;
 960         case NETDEV_FCOE_WWPN:
 961                 prefix = mac->wwpn_prefix;
 962                 break;
 963         default:
 964                 break;
 965         }
 966
 967         if ((prefix != 0xffff) &&
 968             is_valid_ether_addr(mac->san_addr)) {
 969                 *wwn = ((u64) prefix << 48) |
 970                        ((u64) mac->san_addr[0] << 40) |
 971                        ((u64) mac->san_addr[1] << 32) |
 972                        ((u64) mac->san_addr[2] << 24) |
 973                        ((u64) mac->san_addr[3] << 16) |
 974                        ((u64) mac->san_addr[4] << 8)  |
 975                        ((u64) mac->san_addr[5]);
 976                 return 0;
 977         }
 978         return -EINVAL;
 979 }
 980
 981 /**
 982  * ixgbe_fcoe_get_hbainfo - get FCoE HBA information
 983  * @netdev : ixgbe adapter
 984  * @info : HBA information
 985  *
 986  * Returns ixgbe HBA information
 987  *
 988  * Returns : 0 on success
 989  */
 990 int ixgbe_fcoe_get_hbainfo(struct net_device *netdev,
 991                            struct netdev_fcoe_hbainfo *info)
 992 {
 993         struct ixgbe_adapter *adapter = netdev_priv(netdev);
 994         struct ixgbe_hw *hw = &adapter->hw;
 995         int i, pos;
 996         u8 buf[8];
 997
 998         if (!info)
 999                 return -EINVAL;
1000
1001         /* Don't return information on unsupported devices */
1002         if (!(adapter->flags & IXGBE_FLAG_FCOE_ENABLED))
1003                 return -EINVAL;
1004
1005         /* Manufacturer */
1006         snprintf(info->manufacturer, sizeof(info->manufacturer),
1007                  "Intel Corporation");
1008
1009         /* Serial Number */
1010
1011         /* Get the PCI-e Device Serial Number Capability */
1012         pos = pci_find_ext_capability(adapter->pdev, PCI_EXT_CAP_ID_DSN);
1013         if (pos) {
1014                 pos += 4;
1015                 for (i = 0; i < 8; i++)
1016                         pci_read_config_byte(adapter->pdev, pos + i, &buf[i]);
1017
1018                 snprintf(info->serial_number, sizeof(info->serial_number),
1019                          "%02X%02X%02X%02X%02X%02X%02X%02X",
1020                          buf[7], buf[6], buf[5], buf[4],
1021                          buf[3], buf[2], buf[1], buf[0]);
1022         } else
1023                 snprintf(info->serial_number, sizeof(info->serial_number),
1024                          "Unknown");
1025
1026         /* Hardware Version */
1027         snprintf(info->hardware_version,
1028                  sizeof(info->hardware_version),
1029                  "Rev %d", hw->revision_id);
1030         /* Driver Name/Version */
1031         snprintf(info->driver_version,
1032                  sizeof(info->driver_version),
1033                  "%s v%s",
1034                  ixgbe_driver_name,
1035                  ixgbe_driver_version);
1036         /* Firmware Version */
1037         snprintf(info->firmware_version,
1038                  sizeof(info->firmware_version),
1039                  "0x%08x",
1040                  (adapter->eeprom_verh << 16) |
1041                   adapter->eeprom_verl);
1042
1043         /* Model */
1044         if (hw->mac.type == ixgbe_mac_82599EB) {
1045                 snprintf(info->model,
1046                          sizeof(info->model),
1047                          "Intel 82599");
1048         } else if (hw->mac.type == ixgbe_mac_X550) {
1049                 snprintf(info->model,
1050                          sizeof(info->model),
1051                          "Intel X550");
1052         } else {
1053                 snprintf(info->model,
1054                          sizeof(info->model),
1055                          "Intel X540");
1056         }
1057
1058         /* Model Description */
1059         snprintf(info->model_description,
1060                  sizeof(info->model_description),
1061                  "%s",
1062                  ixgbe_default_device_descr);
1063
1064         return 0;
1065 }
1066
1067 /**
1068  * ixgbe_fcoe_get_tc - get the current TC that fcoe is mapped to
1069  * @adapter - pointer to the device adapter structure
1070  *
1071  * Return : TC that FCoE is mapped to
1072  */
1073 u8 ixgbe_fcoe_get_tc(struct ixgbe_adapter *adapter)
1074 {
1075 #ifdef CONFIG_IXGBE_DCB
1076         return netdev_get_prio_tc_map(adapter->netdev, adapter->fcoe.up);
1077 #else
1078         return 0;
1079 #endif
1080 }