linux/drivers/net/ethernet/intel/ixgbe/ixgbe_fcoe.c
<<
>>
Prefs
   1// SPDX-License-Identifier: GPL-2.0
   2/* Copyright(c) 1999 - 2018 Intel Corporation. */
   3
   4#include "ixgbe.h"
   5#include <linux/if_ether.h>
   6#include <linux/gfp.h>
   7#include <linux/if_vlan.h>
   8#include <scsi/scsi_cmnd.h>
   9#include <scsi/scsi_device.h>
  10#include <scsi/fc/fc_fs.h>
  11#include <scsi/fc/fc_fcoe.h>
  12#include <scsi/libfc.h>
  13#include <scsi/libfcoe.h>
  14
  15/**
  16 * ixgbe_fcoe_clear_ddp - clear the given ddp context
  17 * @ddp: ptr to the ixgbe_fcoe_ddp
  18 *
  19 * Returns : none
  20 *
  21 */
  22static inline void ixgbe_fcoe_clear_ddp(struct ixgbe_fcoe_ddp *ddp)
  23{
  24        ddp->len = 0;
  25        ddp->err = 1;
  26        ddp->udl = NULL;
  27        ddp->udp = 0UL;
  28        ddp->sgl = NULL;
  29        ddp->sgc = 0;
  30}
  31
  32/**
  33 * ixgbe_fcoe_ddp_put - free the ddp context for a given xid
  34 * @netdev: the corresponding net_device
  35 * @xid: the xid that corresponding ddp will be freed
  36 *
  37 * This is the implementation of net_device_ops.ndo_fcoe_ddp_done
  38 * and it is expected to be called by ULD, i.e., FCP layer of libfc
  39 * to release the corresponding ddp context when the I/O is done.
  40 *
  41 * Returns : data length already ddp-ed in bytes
  42 */
  43int ixgbe_fcoe_ddp_put(struct net_device *netdev, u16 xid)
  44{
  45        int len;
  46        struct ixgbe_fcoe *fcoe;
  47        struct ixgbe_adapter *adapter;
  48        struct ixgbe_fcoe_ddp *ddp;
  49        struct ixgbe_hw *hw;
  50        u32 fcbuff;
  51
  52        if (!netdev)
  53                return 0;
  54
  55        if (xid >= netdev->fcoe_ddp_xid)
  56                return 0;
  57
  58        adapter = netdev_priv(netdev);
  59        fcoe = &adapter->fcoe;
  60        ddp = &fcoe->ddp[xid];
  61        if (!ddp->udl)
  62                return 0;
  63
  64        hw = &adapter->hw;
  65        len = ddp->len;
  66        /* if no error then skip ddp context invalidation */
  67        if (!ddp->err)
  68                goto skip_ddpinv;
  69
  70        if (hw->mac.type == ixgbe_mac_X550) {
  71                /* X550 does not require DDP FCoE lock */
  72
  73                IXGBE_WRITE_REG(hw, IXGBE_FCDFC(0, xid), 0);
  74                IXGBE_WRITE_REG(hw, IXGBE_FCDFC(3, xid),
  75                                (xid | IXGBE_FCFLTRW_WE));
  76
  77                /* program FCBUFF */
  78                IXGBE_WRITE_REG(hw, IXGBE_FCDDC(2, xid), 0);
  79
  80                /* program FCDMARW */
  81                IXGBE_WRITE_REG(hw, IXGBE_FCDDC(3, xid),
  82                                (xid | IXGBE_FCDMARW_WE));
  83
  84                /* read FCBUFF to check context invalidated */
  85                IXGBE_WRITE_REG(hw, IXGBE_FCDDC(3, xid),
  86                                (xid | IXGBE_FCDMARW_RE));
  87                fcbuff = IXGBE_READ_REG(hw, IXGBE_FCDDC(2, xid));
  88        } else {
  89                /* other hardware requires DDP FCoE lock */
  90                spin_lock_bh(&fcoe->lock);
  91                IXGBE_WRITE_REG(hw, IXGBE_FCFLT, 0);
  92                IXGBE_WRITE_REG(hw, IXGBE_FCFLTRW,
  93                                (xid | IXGBE_FCFLTRW_WE));
  94                IXGBE_WRITE_REG(hw, IXGBE_FCBUFF, 0);
  95                IXGBE_WRITE_REG(hw, IXGBE_FCDMARW,
  96                                (xid | IXGBE_FCDMARW_WE));
  97
  98                /* guaranteed to be invalidated after 100us */
  99                IXGBE_WRITE_REG(hw, IXGBE_FCDMARW,
 100                                (xid | IXGBE_FCDMARW_RE));
 101                fcbuff = IXGBE_READ_REG(hw, IXGBE_FCBUFF);
 102                spin_unlock_bh(&fcoe->lock);
 103                }
 104
 105        if (fcbuff & IXGBE_FCBUFF_VALID)
 106                usleep_range(100, 150);
 107
 108skip_ddpinv:
 109        if (ddp->sgl)
 110                dma_unmap_sg(&adapter->pdev->dev, ddp->sgl, ddp->sgc,
 111                             DMA_FROM_DEVICE);
 112        if (ddp->pool) {
 113                dma_pool_free(ddp->pool, ddp->udl, ddp->udp);
 114                ddp->pool = NULL;
 115        }
 116
 117        ixgbe_fcoe_clear_ddp(ddp);
 118
 119        return len;
 120}
 121
 122/**
 123 * ixgbe_fcoe_ddp_setup - called to set up ddp context
 124 * @netdev: the corresponding net_device
 125 * @xid: the exchange id requesting ddp
 126 * @sgl: the scatter-gather list for this request
 127 * @sgc: the number of scatter-gather items
 128 * @target_mode: 1 to setup target mode, 0 to setup initiator mode
 129 *
 130 * Returns : 1 for success and 0 for no ddp
 131 */
 132static int ixgbe_fcoe_ddp_setup(struct net_device *netdev, u16 xid,
 133                                struct scatterlist *sgl, unsigned int sgc,
 134                                int target_mode)
 135{
 136        struct ixgbe_adapter *adapter;
 137        struct ixgbe_hw *hw;
 138        struct ixgbe_fcoe *fcoe;
 139        struct ixgbe_fcoe_ddp *ddp;
 140        struct ixgbe_fcoe_ddp_pool *ddp_pool;
 141        struct scatterlist *sg;
 142        unsigned int i, j, dmacount;
 143        unsigned int len;
 144        static const unsigned int bufflen = IXGBE_FCBUFF_MIN;
 145        unsigned int firstoff = 0;
 146        unsigned int lastsize;
 147        unsigned int thisoff = 0;
 148        unsigned int thislen = 0;
 149        u32 fcbuff, fcdmarw, fcfltrw, fcrxctl;
 150        dma_addr_t addr = 0;
 151
 152        if (!netdev || !sgl)
 153                return 0;
 154
 155        adapter = netdev_priv(netdev);
 156        if (xid >= netdev->fcoe_ddp_xid) {
 157                e_warn(drv, "xid=0x%x out-of-range\n", xid);
 158                return 0;
 159        }
 160
 161        /* no DDP if we are already down or resetting */
 162        if (test_bit(__IXGBE_DOWN, &adapter->state) ||
 163            test_bit(__IXGBE_RESETTING, &adapter->state))
 164                return 0;
 165
 166        fcoe = &adapter->fcoe;
 167        ddp = &fcoe->ddp[xid];
 168        if (ddp->sgl) {
 169                e_err(drv, "xid 0x%x w/ non-null sgl=%p nents=%d\n",
 170                      xid, ddp->sgl, ddp->sgc);
 171                return 0;
 172        }
 173        ixgbe_fcoe_clear_ddp(ddp);
 174
 175
 176        if (!fcoe->ddp_pool) {
 177                e_warn(drv, "No ddp_pool resources allocated\n");
 178                return 0;
 179        }
 180
 181        ddp_pool = per_cpu_ptr(fcoe->ddp_pool, get_cpu());
 182        if (!ddp_pool->pool) {
 183                e_warn(drv, "xid=0x%x no ddp pool for fcoe\n", xid);
 184                goto out_noddp;
 185        }
 186
 187        /* setup dma from scsi command sgl */
 188        dmacount = dma_map_sg(&adapter->pdev->dev, sgl, sgc, DMA_FROM_DEVICE);
 189        if (dmacount == 0) {
 190                e_err(drv, "xid 0x%x DMA map error\n", xid);
 191                goto out_noddp;
 192        }
 193
 194        /* alloc the udl from per cpu ddp pool */
 195        ddp->udl = dma_pool_alloc(ddp_pool->pool, GFP_KERNEL, &ddp->udp);
 196        if (!ddp->udl) {
 197                e_err(drv, "failed allocated ddp context\n");
 198                goto out_noddp_unmap;
 199        }
 200        ddp->pool = ddp_pool->pool;
 201        ddp->sgl = sgl;
 202        ddp->sgc = sgc;
 203
 204        j = 0;
 205        for_each_sg(sgl, sg, dmacount, i) {
 206                addr = sg_dma_address(sg);
 207                len = sg_dma_len(sg);
 208                while (len) {
 209                        /* max number of buffers allowed in one DDP context */
 210                        if (j >= IXGBE_BUFFCNT_MAX) {
 211                                ddp_pool->noddp++;
 212                                goto out_noddp_free;
 213                        }
 214
 215                        /* get the offset of length of current buffer */
 216                        thisoff = addr & ((dma_addr_t)bufflen - 1);
 217                        thislen = min((bufflen - thisoff), len);
 218                        /*
 219                         * all but the 1st buffer (j == 0)
 220                         * must be aligned on bufflen
 221                         */
 222                        if ((j != 0) && (thisoff))
 223                                goto out_noddp_free;
 224                        /*
 225                         * all but the last buffer
 226                         * ((i == (dmacount - 1)) && (thislen == len))
 227                         * must end at bufflen
 228                         */
 229                        if (((i != (dmacount - 1)) || (thislen != len))
 230                            && ((thislen + thisoff) != bufflen))
 231                                goto out_noddp_free;
 232
 233                        ddp->udl[j] = (u64)(addr - thisoff);
 234                        /* only the first buffer may have none-zero offset */
 235                        if (j == 0)
 236                                firstoff = thisoff;
 237                        len -= thislen;
 238                        addr += thislen;
 239                        j++;
 240                }
 241        }
 242        /* only the last buffer may have non-full bufflen */
 243        lastsize = thisoff + thislen;
 244
 245        /*
 246         * lastsize can not be buffer len.
 247         * If it is then adding another buffer with lastsize = 1.
 248         */
 249        if (lastsize == bufflen) {
 250                if (j >= IXGBE_BUFFCNT_MAX) {
 251                        ddp_pool->noddp_ext_buff++;
 252                        goto out_noddp_free;
 253                }
 254
 255                ddp->udl[j] = (u64)(fcoe->extra_ddp_buffer_dma);
 256                j++;
 257                lastsize = 1;
 258        }
 259        put_cpu();
 260
 261        fcbuff = (IXGBE_FCBUFF_4KB << IXGBE_FCBUFF_BUFFSIZE_SHIFT);
 262        fcbuff |= ((j & 0xff) << IXGBE_FCBUFF_BUFFCNT_SHIFT);
 263        fcbuff |= (firstoff << IXGBE_FCBUFF_OFFSET_SHIFT);
 264        /* Set WRCONTX bit to allow DDP for target */
 265        if (target_mode)
 266                fcbuff |= (IXGBE_FCBUFF_WRCONTX);
 267        fcbuff |= (IXGBE_FCBUFF_VALID);
 268
 269        fcdmarw = xid;
 270        fcdmarw |= IXGBE_FCDMARW_WE;
 271        fcdmarw |= (lastsize << IXGBE_FCDMARW_LASTSIZE_SHIFT);
 272
 273        fcfltrw = xid;
 274        fcfltrw |= IXGBE_FCFLTRW_WE;
 275
 276        /* program DMA context */
 277        hw = &adapter->hw;
 278
 279        /* turn on last frame indication for target mode as FCP_RSPtarget is
 280         * supposed to send FCP_RSP when it is done. */
 281        if (target_mode && !test_bit(__IXGBE_FCOE_TARGET, &fcoe->mode)) {
 282                set_bit(__IXGBE_FCOE_TARGET, &fcoe->mode);
 283                fcrxctl = IXGBE_READ_REG(hw, IXGBE_FCRXCTRL);
 284                fcrxctl |= IXGBE_FCRXCTRL_LASTSEQH;
 285                IXGBE_WRITE_REG(hw, IXGBE_FCRXCTRL, fcrxctl);
 286        }
 287
 288        if (hw->mac.type == ixgbe_mac_X550) {
 289                /* X550 does not require DDP lock */
 290
 291                IXGBE_WRITE_REG(hw, IXGBE_FCDDC(0, xid),
 292                                ddp->udp & DMA_BIT_MASK(32));
 293                IXGBE_WRITE_REG(hw, IXGBE_FCDDC(1, xid), (u64)ddp->udp >> 32);
 294                IXGBE_WRITE_REG(hw, IXGBE_FCDDC(2, xid), fcbuff);
 295                IXGBE_WRITE_REG(hw, IXGBE_FCDDC(3, xid), fcdmarw);
 296                /* program filter context */
 297                IXGBE_WRITE_REG(hw, IXGBE_FCDFC(0, xid), IXGBE_FCFLT_VALID);
 298                IXGBE_WRITE_REG(hw, IXGBE_FCDFC(1, xid), 0);
 299                IXGBE_WRITE_REG(hw, IXGBE_FCDFC(3, xid), fcfltrw);
 300        } else {
 301                /* DDP lock for indirect DDP context access */
 302                spin_lock_bh(&fcoe->lock);
 303
 304                IXGBE_WRITE_REG(hw, IXGBE_FCPTRL, ddp->udp & DMA_BIT_MASK(32));
 305                IXGBE_WRITE_REG(hw, IXGBE_FCPTRH, (u64)ddp->udp >> 32);
 306                IXGBE_WRITE_REG(hw, IXGBE_FCBUFF, fcbuff);
 307                IXGBE_WRITE_REG(hw, IXGBE_FCDMARW, fcdmarw);
 308                /* program filter context */
 309                IXGBE_WRITE_REG(hw, IXGBE_FCPARAM, 0);
 310                IXGBE_WRITE_REG(hw, IXGBE_FCFLT, IXGBE_FCFLT_VALID);
 311                IXGBE_WRITE_REG(hw, IXGBE_FCFLTRW, fcfltrw);
 312
 313                spin_unlock_bh(&fcoe->lock);
 314        }
 315
 316        return 1;
 317
 318out_noddp_free:
 319        dma_pool_free(ddp->pool, ddp->udl, ddp->udp);
 320        ixgbe_fcoe_clear_ddp(ddp);
 321
 322out_noddp_unmap:
 323        dma_unmap_sg(&adapter->pdev->dev, sgl, sgc, DMA_FROM_DEVICE);
 324out_noddp:
 325        put_cpu();
 326        return 0;
 327}
 328
 329/**
 330 * ixgbe_fcoe_ddp_get - called to set up ddp context in initiator mode
 331 * @netdev: the corresponding net_device
 332 * @xid: the exchange id requesting ddp
 333 * @sgl: the scatter-gather list for this request
 334 * @sgc: the number of scatter-gather items
 335 *
 336 * This is the implementation of net_device_ops.ndo_fcoe_ddp_setup
 337 * and is expected to be called from ULD, e.g., FCP layer of libfc
 338 * to set up ddp for the corresponding xid of the given sglist for
 339 * the corresponding I/O.
 340 *
 341 * Returns : 1 for success and 0 for no ddp
 342 */
 343int ixgbe_fcoe_ddp_get(struct net_device *netdev, u16 xid,
 344                       struct scatterlist *sgl, unsigned int sgc)
 345{
 346        return ixgbe_fcoe_ddp_setup(netdev, xid, sgl, sgc, 0);
 347}
 348
 349/**
 350 * ixgbe_fcoe_ddp_target - called to set up ddp context in target mode
 351 * @netdev: the corresponding net_device
 352 * @xid: the exchange id requesting ddp
 353 * @sgl: the scatter-gather list for this request
 354 * @sgc: the number of scatter-gather items
 355 *
 356 * This is the implementation of net_device_ops.ndo_fcoe_ddp_target
 357 * and is expected to be called from ULD, e.g., FCP layer of libfc
 358 * to set up ddp for the corresponding xid of the given sglist for
 359 * the corresponding I/O. The DDP in target mode is a write I/O request
 360 * from the initiator.
 361 *
 362 * Returns : 1 for success and 0 for no ddp
 363 */
 364int ixgbe_fcoe_ddp_target(struct net_device *netdev, u16 xid,
 365                            struct scatterlist *sgl, unsigned int sgc)
 366{
 367        return ixgbe_fcoe_ddp_setup(netdev, xid, sgl, sgc, 1);
 368}
 369
 370/**
 371 * ixgbe_fcoe_ddp - check ddp status and mark it done
 372 * @adapter: ixgbe adapter
 373 * @rx_desc: advanced rx descriptor
 374 * @skb: the skb holding the received data
 375 *
 376 * This checks ddp status.
 377 *
 378 * Returns : < 0 indicates an error or not a FCiE ddp, 0 indicates
 379 * not passing the skb to ULD, > 0 indicates is the length of data
 380 * being ddped.
 381 */
 382int ixgbe_fcoe_ddp(struct ixgbe_adapter *adapter,
 383                   union ixgbe_adv_rx_desc *rx_desc,
 384                   struct sk_buff *skb)
 385{
 386        int rc = -EINVAL;
 387        struct ixgbe_fcoe *fcoe;
 388        struct ixgbe_fcoe_ddp *ddp;
 389        struct fc_frame_header *fh;
 390        struct fcoe_crc_eof *crc;
 391        __le32 fcerr = ixgbe_test_staterr(rx_desc, IXGBE_RXDADV_ERR_FCERR);
 392        __le32 ddp_err;
 393        int ddp_max;
 394        u32 fctl;
 395        u16 xid;
 396
 397        if (fcerr == cpu_to_le32(IXGBE_FCERR_BADCRC))
 398                skb->ip_summed = CHECKSUM_NONE;
 399        else
 400                skb->ip_summed = CHECKSUM_UNNECESSARY;
 401
 402        if (eth_hdr(skb)->h_proto == htons(ETH_P_8021Q))
 403                fh = (struct fc_frame_header *)(skb->data +
 404                        sizeof(struct vlan_hdr) + sizeof(struct fcoe_hdr));
 405        else
 406                fh = (struct fc_frame_header *)(skb->data +
 407                        sizeof(struct fcoe_hdr));
 408
 409        fctl = ntoh24(fh->fh_f_ctl);
 410        if (fctl & FC_FC_EX_CTX)
 411                xid =  be16_to_cpu(fh->fh_ox_id);
 412        else
 413                xid =  be16_to_cpu(fh->fh_rx_id);
 414
 415        ddp_max = IXGBE_FCOE_DDP_MAX;
 416        /* X550 has different DDP Max limit */
 417        if (adapter->hw.mac.type == ixgbe_mac_X550)
 418                ddp_max = IXGBE_FCOE_DDP_MAX_X550;
 419        if (xid >= ddp_max)
 420                return -EINVAL;
 421
 422        fcoe = &adapter->fcoe;
 423        ddp = &fcoe->ddp[xid];
 424        if (!ddp->udl)
 425                return -EINVAL;
 426
 427        ddp_err = ixgbe_test_staterr(rx_desc, IXGBE_RXDADV_ERR_FCEOFE |
 428                                              IXGBE_RXDADV_ERR_FCERR);
 429        if (ddp_err)
 430                return -EINVAL;
 431
 432        switch (ixgbe_test_staterr(rx_desc, IXGBE_RXDADV_STAT_FCSTAT)) {
 433        /* return 0 to bypass going to ULD for DDPed data */
 434        case cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_DDP):
 435                /* update length of DDPed data */
 436                ddp->len = le32_to_cpu(rx_desc->wb.lower.hi_dword.rss);
 437                rc = 0;
 438                break;
 439        /* unmap the sg list when FCPRSP is received */
 440        case cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_FCPRSP):
 441                dma_unmap_sg(&adapter->pdev->dev, ddp->sgl,
 442                             ddp->sgc, DMA_FROM_DEVICE);
 443                ddp->err = (__force u32)ddp_err;
 444                ddp->sgl = NULL;
 445                ddp->sgc = 0;
 446                /* fall through */
 447        /* if DDP length is present pass it through to ULD */
 448        case cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_NODDP):
 449                /* update length of DDPed data */
 450                ddp->len = le32_to_cpu(rx_desc->wb.lower.hi_dword.rss);
 451                if (ddp->len)
 452                        rc = ddp->len;
 453                break;
 454        /* no match will return as an error */
 455        case cpu_to_le32(IXGBE_RXDADV_STAT_FCSTAT_NOMTCH):
 456        default:
 457                break;
 458        }
 459
 460        /* In target mode, check the last data frame of the sequence.
 461         * For DDP in target mode, data is already DDPed but the header
 462         * indication of the last data frame ould allow is to tell if we
 463         * got all the data and the ULP can send FCP_RSP back, as this is
 464         * not a full fcoe frame, we fill the trailer here so it won't be
 465         * dropped by the ULP stack.
 466         */
 467        if ((fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA) &&
 468            (fctl & FC_FC_END_SEQ)) {
 469                skb_linearize(skb);
 470                crc = skb_put(skb, sizeof(*crc));
 471                crc->fcoe_eof = FC_EOF_T;
 472        }
 473
 474        return rc;
 475}
 476
 477/**
 478 * ixgbe_fso - ixgbe FCoE Sequence Offload (FSO)
 479 * @tx_ring: tx desc ring
 480 * @first: first tx_buffer structure containing skb, tx_flags, and protocol
 481 * @hdr_len: hdr_len to be returned
 482 *
 483 * This sets up large send offload for FCoE
 484 *
 485 * Returns : 0 indicates success, < 0 for error
 486 */
 487int ixgbe_fso(struct ixgbe_ring *tx_ring,
 488              struct ixgbe_tx_buffer *first,
 489              u8 *hdr_len)
 490{
 491        struct sk_buff *skb = first->skb;
 492        struct fc_frame_header *fh;
 493        u32 vlan_macip_lens;
 494        u32 fcoe_sof_eof = 0;
 495        u32 mss_l4len_idx;
 496        u32 type_tucmd = IXGBE_ADVTXT_TUCMD_FCOE;
 497        u8 sof, eof;
 498
 499        if (skb_is_gso(skb) && (skb_shinfo(skb)->gso_type != SKB_GSO_FCOE)) {
 500                dev_err(tx_ring->dev, "Wrong gso type %d:expecting SKB_GSO_FCOE\n",
 501                        skb_shinfo(skb)->gso_type);
 502                return -EINVAL;
 503        }
 504
 505        /* resets the header to point fcoe/fc */
 506        skb_set_network_header(skb, skb->mac_len);
 507        skb_set_transport_header(skb, skb->mac_len +
 508                                 sizeof(struct fcoe_hdr));
 509
 510        /* sets up SOF and ORIS */
 511        sof = ((struct fcoe_hdr *)skb_network_header(skb))->fcoe_sof;
 512        switch (sof) {
 513        case FC_SOF_I2:
 514                fcoe_sof_eof = IXGBE_ADVTXD_FCOEF_ORIS;
 515                break;
 516        case FC_SOF_I3:
 517                fcoe_sof_eof = IXGBE_ADVTXD_FCOEF_SOF |
 518                               IXGBE_ADVTXD_FCOEF_ORIS;
 519                break;
 520        case FC_SOF_N2:
 521                break;
 522        case FC_SOF_N3:
 523                fcoe_sof_eof = IXGBE_ADVTXD_FCOEF_SOF;
 524                break;
 525        default:
 526                dev_warn(tx_ring->dev, "unknown sof = 0x%x\n", sof);
 527                return -EINVAL;
 528        }
 529
 530        /* the first byte of the last dword is EOF */
 531        skb_copy_bits(skb, skb->len - 4, &eof, 1);
 532        /* sets up EOF and ORIE */
 533        switch (eof) {
 534        case FC_EOF_N:
 535                fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_N;
 536                break;
 537        case FC_EOF_T:
 538                /* lso needs ORIE */
 539                if (skb_is_gso(skb))
 540                        fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_N |
 541                                        IXGBE_ADVTXD_FCOEF_ORIE;
 542                else
 543                        fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_T;
 544                break;
 545        case FC_EOF_NI:
 546                fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_NI;
 547                break;
 548        case FC_EOF_A:
 549                fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_EOF_A;
 550                break;
 551        default:
 552                dev_warn(tx_ring->dev, "unknown eof = 0x%x\n", eof);
 553                return -EINVAL;
 554        }
 555
 556        /* sets up PARINC indicating data offset */
 557        fh = (struct fc_frame_header *)skb_transport_header(skb);
 558        if (fh->fh_f_ctl[2] & FC_FC_REL_OFF)
 559                fcoe_sof_eof |= IXGBE_ADVTXD_FCOEF_PARINC;
 560
 561        /* include trailer in headlen as it is replicated per frame */
 562        *hdr_len = sizeof(struct fcoe_crc_eof);
 563
 564        /* hdr_len includes fc_hdr if FCoE LSO is enabled */
 565        if (skb_is_gso(skb)) {
 566                *hdr_len += skb_transport_offset(skb) +
 567                            sizeof(struct fc_frame_header);
 568                /* update gso_segs and bytecount */
 569                first->gso_segs = DIV_ROUND_UP(skb->len - *hdr_len,
 570                                               skb_shinfo(skb)->gso_size);
 571                first->bytecount += (first->gso_segs - 1) * *hdr_len;
 572                first->tx_flags |= IXGBE_TX_FLAGS_TSO;
 573                /* Hardware expects L4T to be RSV for FCoE TSO */
 574                type_tucmd |= IXGBE_ADVTXD_TUCMD_L4T_RSV;
 575        }
 576
 577        /* set flag indicating FCOE to ixgbe_tx_map call */
 578        first->tx_flags |= IXGBE_TX_FLAGS_FCOE | IXGBE_TX_FLAGS_CC;
 579
 580        /* mss_l4len_id: use 0 for FSO as TSO, no need for L4LEN */
 581        mss_l4len_idx = skb_shinfo(skb)->gso_size << IXGBE_ADVTXD_MSS_SHIFT;
 582
 583        /* vlan_macip_lens: HEADLEN, MACLEN, VLAN tag */
 584        vlan_macip_lens = skb_transport_offset(skb) +
 585                          sizeof(struct fc_frame_header);
 586        vlan_macip_lens |= (skb_transport_offset(skb) - 4)
 587                           << IXGBE_ADVTXD_MACLEN_SHIFT;
 588        vlan_macip_lens |= first->tx_flags & IXGBE_TX_FLAGS_VLAN_MASK;
 589
 590        /* write context desc */
 591        ixgbe_tx_ctxtdesc(tx_ring, vlan_macip_lens, fcoe_sof_eof,
 592                          type_tucmd, mss_l4len_idx);
 593
 594        return 0;
 595}
 596
 597static void ixgbe_fcoe_dma_pool_free(struct ixgbe_fcoe *fcoe, unsigned int cpu)
 598{
 599        struct ixgbe_fcoe_ddp_pool *ddp_pool;
 600
 601        ddp_pool = per_cpu_ptr(fcoe->ddp_pool, cpu);
 602        dma_pool_destroy(ddp_pool->pool);
 603        ddp_pool->pool = NULL;
 604}
 605
 606static int ixgbe_fcoe_dma_pool_alloc(struct ixgbe_fcoe *fcoe,
 607                                     struct device *dev,
 608                                     unsigned int cpu)
 609{
 610        struct ixgbe_fcoe_ddp_pool *ddp_pool;
 611        struct dma_pool *pool;
 612        char pool_name[32];
 613
 614        snprintf(pool_name, 32, "ixgbe_fcoe_ddp_%u", cpu);
 615
 616        pool = dma_pool_create(pool_name, dev, IXGBE_FCPTR_MAX,
 617                               IXGBE_FCPTR_ALIGN, PAGE_SIZE);
 618        if (!pool)
 619                return -ENOMEM;
 620
 621        ddp_pool = per_cpu_ptr(fcoe->ddp_pool, cpu);
 622        ddp_pool->pool = pool;
 623        ddp_pool->noddp = 0;
 624        ddp_pool->noddp_ext_buff = 0;
 625
 626        return 0;
 627}
 628
 629/**
 630 * ixgbe_configure_fcoe - configures registers for fcoe at start
 631 * @adapter: ptr to ixgbe adapter
 632 *
 633 * This sets up FCoE related registers
 634 *
 635 * Returns : none
 636 */
 637void ixgbe_configure_fcoe(struct ixgbe_adapter *adapter)
 638{
 639        struct ixgbe_ring_feature *fcoe = &adapter->ring_feature[RING_F_FCOE];
 640        struct ixgbe_hw *hw = &adapter->hw;
 641        int i, fcoe_q, fcoe_i, fcoe_q_h = 0;
 642        int fcreta_size;
 643        u32 etqf;
 644
 645        /* Minimal functionality for FCoE requires at least CRC offloads */
 646        if (!(adapter->netdev->features & NETIF_F_FCOE_CRC))
 647                return;
 648
 649        /* Enable L2 EtherType filter for FCoE, needed for FCoE CRC and DDP */
 650        etqf = ETH_P_FCOE | IXGBE_ETQF_FCOE | IXGBE_ETQF_FILTER_EN;
 651        if (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED) {
 652                etqf |= IXGBE_ETQF_POOL_ENABLE;
 653                etqf |= VMDQ_P(0) << IXGBE_ETQF_POOL_SHIFT;
 654        }
 655        IXGBE_WRITE_REG(hw, IXGBE_ETQF(IXGBE_ETQF_FILTER_FCOE), etqf);
 656        IXGBE_WRITE_REG(hw, IXGBE_ETQS(IXGBE_ETQF_FILTER_FCOE), 0);
 657
 658        /* leave registers un-configured if FCoE is disabled */
 659        if (!(adapter->flags & IXGBE_FLAG_FCOE_ENABLED))
 660                return;
 661
 662        /* Use one or more Rx queues for FCoE by redirection table */
 663        fcreta_size = IXGBE_FCRETA_SIZE;
 664        if (adapter->hw.mac.type == ixgbe_mac_X550)
 665                fcreta_size = IXGBE_FCRETA_SIZE_X550;
 666
 667        for (i = 0; i < fcreta_size; i++) {
 668                if (adapter->hw.mac.type == ixgbe_mac_X550) {
 669                        int fcoe_i_h = fcoe->offset + ((i + fcreta_size) %
 670                                                        fcoe->indices);
 671                        fcoe_q_h = adapter->rx_ring[fcoe_i_h]->reg_idx;
 672                        fcoe_q_h = (fcoe_q_h << IXGBE_FCRETA_ENTRY_HIGH_SHIFT) &
 673                                   IXGBE_FCRETA_ENTRY_HIGH_MASK;
 674                }
 675
 676                fcoe_i = fcoe->offset + (i % fcoe->indices);
 677                fcoe_i &= IXGBE_FCRETA_ENTRY_MASK;
 678                fcoe_q = adapter->rx_ring[fcoe_i]->reg_idx;
 679                fcoe_q |= fcoe_q_h;
 680                IXGBE_WRITE_REG(hw, IXGBE_FCRETA(i), fcoe_q);
 681        }
 682        IXGBE_WRITE_REG(hw, IXGBE_FCRECTL, IXGBE_FCRECTL_ENA);
 683
 684        /* Enable L2 EtherType filter for FIP */
 685        etqf = ETH_P_FIP | IXGBE_ETQF_FILTER_EN;
 686        if (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED) {
 687                etqf |= IXGBE_ETQF_POOL_ENABLE;
 688                etqf |= VMDQ_P(0) << IXGBE_ETQF_POOL_SHIFT;
 689        }
 690        IXGBE_WRITE_REG(hw, IXGBE_ETQF(IXGBE_ETQF_FILTER_FIP), etqf);
 691
 692        /* Send FIP frames to the first FCoE queue */
 693        fcoe_q = adapter->rx_ring[fcoe->offset]->reg_idx;
 694        IXGBE_WRITE_REG(hw, IXGBE_ETQS(IXGBE_ETQF_FILTER_FIP),
 695                        IXGBE_ETQS_QUEUE_EN |
 696                        (fcoe_q << IXGBE_ETQS_RX_QUEUE_SHIFT));
 697
 698        /* Configure FCoE Rx control */
 699        IXGBE_WRITE_REG(hw, IXGBE_FCRXCTRL,
 700                        IXGBE_FCRXCTRL_FCCRCBO |
 701                        (FC_FCOE_VER << IXGBE_FCRXCTRL_FCOEVER_SHIFT));
 702}
 703
 704/**
 705 * ixgbe_free_fcoe_ddp_resources - release all fcoe ddp context resources
 706 * @adapter : ixgbe adapter
 707 *
 708 * Cleans up outstanding ddp context resources
 709 *
 710 * Returns : none
 711 */
 712void ixgbe_free_fcoe_ddp_resources(struct ixgbe_adapter *adapter)
 713{
 714        struct ixgbe_fcoe *fcoe = &adapter->fcoe;
 715        int cpu, i, ddp_max;
 716
 717        /* do nothing if no DDP pools were allocated */
 718        if (!fcoe->ddp_pool)
 719                return;
 720
 721        ddp_max = IXGBE_FCOE_DDP_MAX;
 722        /* X550 has different DDP Max limit */
 723        if (adapter->hw.mac.type == ixgbe_mac_X550)
 724                ddp_max = IXGBE_FCOE_DDP_MAX_X550;
 725
 726        for (i = 0; i < ddp_max; i++)
 727                ixgbe_fcoe_ddp_put(adapter->netdev, i);
 728
 729        for_each_possible_cpu(cpu)
 730                ixgbe_fcoe_dma_pool_free(fcoe, cpu);
 731
 732        dma_unmap_single(&adapter->pdev->dev,
 733                         fcoe->extra_ddp_buffer_dma,
 734                         IXGBE_FCBUFF_MIN,
 735                         DMA_FROM_DEVICE);
 736        kfree(fcoe->extra_ddp_buffer);
 737
 738        fcoe->extra_ddp_buffer = NULL;
 739        fcoe->extra_ddp_buffer_dma = 0;
 740}
 741
 742/**
 743 * ixgbe_setup_fcoe_ddp_resources - setup all fcoe ddp context resources
 744 * @adapter: ixgbe adapter
 745 *
 746 * Sets up ddp context resouces
 747 *
 748 * Returns : 0 indicates success or -EINVAL on failure
 749 */
 750int ixgbe_setup_fcoe_ddp_resources(struct ixgbe_adapter *adapter)
 751{
 752        struct ixgbe_fcoe *fcoe = &adapter->fcoe;
 753        struct device *dev = &adapter->pdev->dev;
 754        void *buffer;
 755        dma_addr_t dma;
 756        unsigned int cpu;
 757
 758        /* do nothing if no DDP pools were allocated */
 759        if (!fcoe->ddp_pool)
 760                return 0;
 761
 762        /* Extra buffer to be shared by all DDPs for HW work around */
 763        buffer = kmalloc(IXGBE_FCBUFF_MIN, GFP_KERNEL);
 764        if (!buffer)
 765                return -ENOMEM;
 766
 767        dma = dma_map_single(dev, buffer, IXGBE_FCBUFF_MIN, DMA_FROM_DEVICE);
 768        if (dma_mapping_error(dev, dma)) {
 769                e_err(drv, "failed to map extra DDP buffer\n");
 770                kfree(buffer);
 771                return -ENOMEM;
 772        }
 773
 774        fcoe->extra_ddp_buffer = buffer;
 775        fcoe->extra_ddp_buffer_dma = dma;
 776
 777        /* allocate pci pool for each cpu */
 778        for_each_possible_cpu(cpu) {
 779                int err = ixgbe_fcoe_dma_pool_alloc(fcoe, dev, cpu);
 780                if (!err)
 781                        continue;
 782
 783                e_err(drv, "failed to alloc DDP pool on cpu:%d\n", cpu);
 784                ixgbe_free_fcoe_ddp_resources(adapter);
 785                return -ENOMEM;
 786        }
 787
 788        return 0;
 789}
 790
 791static int ixgbe_fcoe_ddp_enable(struct ixgbe_adapter *adapter)
 792{
 793        struct ixgbe_fcoe *fcoe = &adapter->fcoe;
 794
 795        if (!(adapter->flags & IXGBE_FLAG_FCOE_CAPABLE))
 796                return -EINVAL;
 797
 798        fcoe->ddp_pool = alloc_percpu(struct ixgbe_fcoe_ddp_pool);
 799
 800        if (!fcoe->ddp_pool) {
 801                e_err(drv, "failed to allocate percpu DDP resources\n");
 802                return -ENOMEM;
 803        }
 804
 805        adapter->netdev->fcoe_ddp_xid = IXGBE_FCOE_DDP_MAX - 1;
 806        /* X550 has different DDP Max limit */
 807        if (adapter->hw.mac.type == ixgbe_mac_X550)
 808                adapter->netdev->fcoe_ddp_xid = IXGBE_FCOE_DDP_MAX_X550 - 1;
 809
 810        return 0;
 811}
 812
 813static void ixgbe_fcoe_ddp_disable(struct ixgbe_adapter *adapter)
 814{
 815        struct ixgbe_fcoe *fcoe = &adapter->fcoe;
 816
 817        adapter->netdev->fcoe_ddp_xid = 0;
 818
 819        if (!fcoe->ddp_pool)
 820                return;
 821
 822        free_percpu(fcoe->ddp_pool);
 823        fcoe->ddp_pool = NULL;
 824}
 825
 826/**
 827 * ixgbe_fcoe_enable - turn on FCoE offload feature
 828 * @netdev: the corresponding netdev
 829 *
 830 * Turns on FCoE offload feature in 82599.
 831 *
 832 * Returns : 0 indicates success or -EINVAL on failure
 833 */
 834int ixgbe_fcoe_enable(struct net_device *netdev)
 835{
 836        struct ixgbe_adapter *adapter = netdev_priv(netdev);
 837        struct ixgbe_fcoe *fcoe = &adapter->fcoe;
 838
 839        atomic_inc(&fcoe->refcnt);
 840
 841        if (!(adapter->flags & IXGBE_FLAG_FCOE_CAPABLE))
 842                return -EINVAL;
 843
 844        if (adapter->flags & IXGBE_FLAG_FCOE_ENABLED)
 845                return -EINVAL;
 846
 847        e_info(drv, "Enabling FCoE offload features.\n");
 848
 849        if (adapter->flags & IXGBE_FLAG_SRIOV_ENABLED)
 850                e_warn(probe, "Enabling FCoE on PF will disable legacy VFs\n");
 851
 852        if (netif_running(netdev))
 853                netdev->netdev_ops->ndo_stop(netdev);
 854
 855        /* Allocate per CPU memory to track DDP pools */
 856        ixgbe_fcoe_ddp_enable(adapter);
 857
 858        /* enable FCoE and notify stack */
 859        adapter->flags |= IXGBE_FLAG_FCOE_ENABLED;
 860        netdev->features |= NETIF_F_FCOE_MTU;
 861        netdev_features_change(netdev);
 862
 863        /* release existing queues and reallocate them */
 864        ixgbe_clear_interrupt_scheme(adapter);
 865        ixgbe_init_interrupt_scheme(adapter);
 866
 867        if (netif_running(netdev))
 868                netdev->netdev_ops->ndo_open(netdev);
 869
 870        return 0;
 871}
 872
 873/**
 874 * ixgbe_fcoe_disable - turn off FCoE offload feature
 875 * @netdev: the corresponding netdev
 876 *
 877 * Turns off FCoE offload feature in 82599.
 878 *
 879 * Returns : 0 indicates success or -EINVAL on failure
 880 */
 881int ixgbe_fcoe_disable(struct net_device *netdev)
 882{
 883        struct ixgbe_adapter *adapter = netdev_priv(netdev);
 884
 885        if (!atomic_dec_and_test(&adapter->fcoe.refcnt))
 886                return -EINVAL;
 887
 888        if (!(adapter->flags & IXGBE_FLAG_FCOE_ENABLED))
 889                return -EINVAL;
 890
 891        e_info(drv, "Disabling FCoE offload features.\n");
 892        if (netif_running(netdev))
 893                netdev->netdev_ops->ndo_stop(netdev);
 894
 895        /* Free per CPU memory to track DDP pools */
 896        ixgbe_fcoe_ddp_disable(adapter);
 897
 898        /* disable FCoE and notify stack */
 899        adapter->flags &= ~IXGBE_FLAG_FCOE_ENABLED;
 900        netdev->features &= ~NETIF_F_FCOE_MTU;
 901
 902        netdev_features_change(netdev);
 903
 904        /* release existing queues and reallocate them */
 905        ixgbe_clear_interrupt_scheme(adapter);
 906        ixgbe_init_interrupt_scheme(adapter);
 907
 908        if (netif_running(netdev))
 909                netdev->netdev_ops->ndo_open(netdev);
 910
 911        return 0;
 912}
 913
 914/**
 915 * ixgbe_fcoe_get_wwn - get world wide name for the node or the port
 916 * @netdev : ixgbe adapter
 917 * @wwn : the world wide name
 918 * @type: the type of world wide name
 919 *
 920 * Returns the node or port world wide name if both the prefix and the san
 921 * mac address are valid, then the wwn is formed based on the NAA-2 for
 922 * IEEE Extended name identifier (ref. to T10 FC-LS Spec., Sec. 15.3).
 923 *
 924 * Returns : 0 on success
 925 */
 926int ixgbe_fcoe_get_wwn(struct net_device *netdev, u64 *wwn, int type)
 927{
 928        u16 prefix = 0xffff;
 929        struct ixgbe_adapter *adapter = netdev_priv(netdev);
 930        struct ixgbe_mac_info *mac = &adapter->hw.mac;
 931
 932        switch (type) {
 933        case NETDEV_FCOE_WWNN:
 934                prefix = mac->wwnn_prefix;
 935                break;
 936        case NETDEV_FCOE_WWPN:
 937                prefix = mac->wwpn_prefix;
 938                break;
 939        default:
 940                break;
 941        }
 942
 943        if ((prefix != 0xffff) &&
 944            is_valid_ether_addr(mac->san_addr)) {
 945                *wwn = ((u64) prefix << 48) |
 946                       ((u64) mac->san_addr[0] << 40) |
 947                       ((u64) mac->san_addr[1] << 32) |
 948                       ((u64) mac->san_addr[2] << 24) |
 949                       ((u64) mac->san_addr[3] << 16) |
 950                       ((u64) mac->san_addr[4] << 8)  |
 951                       ((u64) mac->san_addr[5]);
 952                return 0;
 953        }
 954        return -EINVAL;
 955}
 956
 957/**
 958 * ixgbe_fcoe_get_hbainfo - get FCoE HBA information
 959 * @netdev : ixgbe adapter
 960 * @info : HBA information
 961 *
 962 * Returns ixgbe HBA information
 963 *
 964 * Returns : 0 on success
 965 */
 966int ixgbe_fcoe_get_hbainfo(struct net_device *netdev,
 967                           struct netdev_fcoe_hbainfo *info)
 968{
 969        struct ixgbe_adapter *adapter = netdev_priv(netdev);
 970        struct ixgbe_hw *hw = &adapter->hw;
 971        int i, pos;
 972        u8 buf[8];
 973
 974        if (!info)
 975                return -EINVAL;
 976
 977        /* Don't return information on unsupported devices */
 978        if (!(adapter->flags & IXGBE_FLAG_FCOE_ENABLED))
 979                return -EINVAL;
 980
 981        /* Manufacturer */
 982        snprintf(info->manufacturer, sizeof(info->manufacturer),
 983                 "Intel Corporation");
 984
 985        /* Serial Number */
 986
 987        /* Get the PCI-e Device Serial Number Capability */
 988        pos = pci_find_ext_capability(adapter->pdev, PCI_EXT_CAP_ID_DSN);
 989        if (pos) {
 990                pos += 4;
 991                for (i = 0; i < 8; i++)
 992                        pci_read_config_byte(adapter->pdev, pos + i, &buf[i]);
 993
 994                snprintf(info->serial_number, sizeof(info->serial_number),
 995                         "%02X%02X%02X%02X%02X%02X%02X%02X",
 996                         buf[7], buf[6], buf[5], buf[4],
 997                         buf[3], buf[2], buf[1], buf[0]);
 998        } else
 999                snprintf(info->serial_number, sizeof(info->serial_number),
1000                         "Unknown");
1001
1002        /* Hardware Version */
1003        snprintf(info->hardware_version,
1004                 sizeof(info->hardware_version),
1005                 "Rev %d", hw->revision_id);
1006        /* Driver Name/Version */
1007        snprintf(info->driver_version,
1008                 sizeof(info->driver_version),
1009                 "%s v%s",
1010                 ixgbe_driver_name,
1011                 ixgbe_driver_version);
1012        /* Firmware Version */
1013        strlcpy(info->firmware_version, adapter->eeprom_id,
1014                sizeof(info->firmware_version));
1015
1016        /* Model */
1017        if (hw->mac.type == ixgbe_mac_82599EB) {
1018                snprintf(info->model,
1019                         sizeof(info->model),
1020                         "Intel 82599");
1021        } else if (hw->mac.type == ixgbe_mac_X550) {
1022                snprintf(info->model,
1023                         sizeof(info->model),
1024                         "Intel X550");
1025        } else {
1026                snprintf(info->model,
1027                         sizeof(info->model),
1028                         "Intel X540");
1029        }
1030
1031        /* Model Description */
1032        snprintf(info->model_description,
1033                 sizeof(info->model_description),
1034                 "%s",
1035                 ixgbe_default_device_descr);
1036
1037        return 0;
1038}
1039
1040/**
1041 * ixgbe_fcoe_get_tc - get the current TC that fcoe is mapped to
1042 * @adapter: pointer to the device adapter structure
1043 *
1044 * Return : TC that FCoE is mapped to
1045 */
1046u8 ixgbe_fcoe_get_tc(struct ixgbe_adapter *adapter)
1047{
1048#ifdef CONFIG_IXGBE_DCB
1049        return netdev_get_prio_tc_map(adapter->netdev, adapter->fcoe.up);
1050#else
1051        return 0;
1052#endif
1053}
1054