drivers/net/ethernet/mellanox/mlx4/en_tx.c

   1 /*
   2  * Copyright (c) 2007 Mellanox Technologies. All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  *
  32  */
  33
  34 #include <asm/page.h>
  35 #include <linux/mlx4/cq.h>
  36 #include <linux/slab.h>
  37 #include <linux/mlx4/qp.h>
  38 #include <linux/skbuff.h>
  39 #include <linux/if_vlan.h>
  40 #include <linux/vmalloc.h>
  41 #include <linux/tcp.h>
  42 #include <linux/moduleparam.h>
  43
  44 #include "mlx4_en.h"
  45
  46 enum {
  47         MAX_INLINE = 104, /* 128 - 16 - 4 - 4 */
  48         MAX_BF = 256,
  49 };
  50
  51 static int inline_thold __read_mostly = MAX_INLINE;
  52
  53 module_param_named(inline_thold, inline_thold, int, 0444);
  54 MODULE_PARM_DESC(inline_thold, "threshold for using inline data");
  55
  56 int mlx4_en_create_tx_ring(struct mlx4_en_priv *priv,
  57                            struct mlx4_en_tx_ring **pring, int qpn, u32 size,
  58                            u16 stride, int node)
  59 {
  60         struct mlx4_en_dev *mdev = priv->mdev;
  61         struct mlx4_en_tx_ring *ring;
  62         int tmp;
  63         int err;
  64
  65         ring = kzalloc_node(sizeof(*ring), GFP_KERNEL, node);
  66         if (!ring) {
  67                 ring = kzalloc(sizeof(*ring), GFP_KERNEL);
  68                 if (!ring) {
  69                         en_err(priv, "Failed allocating TX ring\n");
  70                         return -ENOMEM;
  71                 }
  72         }
  73
  74         ring->size = size;
  75         ring->size_mask = size - 1;
  76         ring->stride = stride;
  77
  78         inline_thold = min(inline_thold, MAX_INLINE);
  79
  80         tmp = size * sizeof(struct mlx4_en_tx_info);
  81         ring->tx_info = vmalloc_node(tmp, node);
  82         if (!ring->tx_info) {
  83                 ring->tx_info = vmalloc(tmp);
  84                 if (!ring->tx_info) {
  85                         err = -ENOMEM;
  86                         goto err_ring;
  87                 }
  88         }
  89
  90         en_dbg(DRV, priv, "Allocated tx_info ring at addr:%p size:%d\n",
  91                  ring->tx_info, tmp);
  92
  93         ring->bounce_buf = kmalloc_node(MAX_DESC_SIZE, GFP_KERNEL, node);
  94         if (!ring->bounce_buf) {
  95                 ring->bounce_buf = kmalloc(MAX_DESC_SIZE, GFP_KERNEL);
  96                 if (!ring->bounce_buf) {
  97                         err = -ENOMEM;
  98                         goto err_info;
  99                 }
 100         }
 101         ring->buf_size = ALIGN(size * ring->stride, MLX4_EN_PAGE_SIZE);
 102
 103         /* Allocate HW buffers on provided NUMA node */
 104         set_dev_node(&mdev->dev->pdev->dev, node);
 105         err = mlx4_alloc_hwq_res(mdev->dev, &ring->wqres, ring->buf_size,
 106                                  2 * PAGE_SIZE);
 107         set_dev_node(&mdev->dev->pdev->dev, mdev->dev->numa_node);
 108         if (err) {
 109                 en_err(priv, "Failed allocating hwq resources\n");
 110                 goto err_bounce;
 111         }
 112
 113         err = mlx4_en_map_buffer(&ring->wqres.buf);
 114         if (err) {
 115                 en_err(priv, "Failed to map TX buffer\n");
 116                 goto err_hwq_res;
 117         }
 118
 119         ring->buf = ring->wqres.buf.direct.buf;
 120
 121         en_dbg(DRV, priv, "Allocated TX ring (addr:%p) - buf:%p size:%d "
 122                "buf_size:%d dma:%llx\n", ring, ring->buf, ring->size,
 123                ring->buf_size, (unsigned long long) ring->wqres.buf.direct.map);
 124
 125         ring->qpn = qpn;
 126         err = mlx4_qp_alloc(mdev->dev, ring->qpn, &ring->qp);
 127         if (err) {
 128                 en_err(priv, "Failed allocating qp %d\n", ring->qpn);
 129                 goto err_map;
 130         }
 131         ring->qp.event = mlx4_en_sqp_event;
 132
 133         err = mlx4_bf_alloc(mdev->dev, &ring->bf, node);
 134         if (err) {
 135                 en_dbg(DRV, priv, "working without blueflame (%d)", err);
 136                 ring->bf.uar = &mdev->priv_uar;
 137                 ring->bf.uar->map = mdev->uar_map;
 138                 ring->bf_enabled = false;
 139         } else
 140                 ring->bf_enabled = true;
 141
 142         ring->hwtstamp_tx_type = priv->hwtstamp_config.tx_type;
 143
 144         *pring = ring;
 145         return 0;
 146
 147 err_map:
 148         mlx4_en_unmap_buffer(&ring->wqres.buf);
 149 err_hwq_res:
 150         mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size);
 151 err_bounce:
 152         kfree(ring->bounce_buf);
 153         ring->bounce_buf = NULL;
 154 err_info:
 155         vfree(ring->tx_info);
 156         ring->tx_info = NULL;
 157 err_ring:
 158         kfree(ring);
 159         *pring = NULL;
 160         return err;
 161 }
 162
 163 void mlx4_en_destroy_tx_ring(struct mlx4_en_priv *priv,
 164                              struct mlx4_en_tx_ring **pring)
 165 {
 166         struct mlx4_en_dev *mdev = priv->mdev;
 167         struct mlx4_en_tx_ring *ring = *pring;
 168         en_dbg(DRV, priv, "Destroying tx ring, qpn: %d\n", ring->qpn);
 169
 170         if (ring->bf_enabled)
 171                 mlx4_bf_free(mdev->dev, &ring->bf);
 172         mlx4_qp_remove(mdev->dev, &ring->qp);
 173         mlx4_qp_free(mdev->dev, &ring->qp);
 174         mlx4_en_unmap_buffer(&ring->wqres.buf);
 175         mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size);
 176         kfree(ring->bounce_buf);
 177         ring->bounce_buf = NULL;
 178         vfree(ring->tx_info);
 179         ring->tx_info = NULL;
 180         kfree(ring);
 181         *pring = NULL;
 182 }
 183
 184 int mlx4_en_activate_tx_ring(struct mlx4_en_priv *priv,
 185                              struct mlx4_en_tx_ring *ring,
 186                              int cq, int user_prio)
 187 {
 188         struct mlx4_en_dev *mdev = priv->mdev;
 189         int err;
 190
 191         ring->cqn = cq;
 192         ring->prod = 0;
 193         ring->cons = 0xffffffff;
 194         ring->last_nr_txbb = 1;
 195         ring->poll_cnt = 0;
 196         memset(ring->tx_info, 0, ring->size * sizeof(struct mlx4_en_tx_info));
 197         memset(ring->buf, 0, ring->buf_size);
 198
 199         ring->qp_state = MLX4_QP_STATE_RST;
 200         ring->doorbell_qpn = ring->qp.qpn << 8;
 201
 202         mlx4_en_fill_qp_context(priv, ring->size, ring->stride, 1, 0, ring->qpn,
 203                                 ring->cqn, user_prio, &ring->context);
 204         if (ring->bf_enabled)
 205                 ring->context.usr_page = cpu_to_be32(ring->bf.uar->index);
 206
 207         err = mlx4_qp_to_ready(mdev->dev, &ring->wqres.mtt, &ring->context,
 208                                &ring->qp, &ring->qp_state);
 209
 210         return err;
 211 }
 212
 213 void mlx4_en_deactivate_tx_ring(struct mlx4_en_priv *priv,
 214                                 struct mlx4_en_tx_ring *ring)
 215 {
 216         struct mlx4_en_dev *mdev = priv->mdev;
 217
 218         mlx4_qp_modify(mdev->dev, NULL, ring->qp_state,
 219                        MLX4_QP_STATE_RST, NULL, 0, 0, &ring->qp);
 220 }
 221
 222 static void mlx4_en_stamp_wqe(struct mlx4_en_priv *priv,
 223                               struct mlx4_en_tx_ring *ring, int index,
 224                               u8 owner)
 225 {
 226         __be32 stamp = cpu_to_be32(STAMP_VAL | (!!owner << STAMP_SHIFT));
 227         struct mlx4_en_tx_desc *tx_desc = ring->buf + index * TXBB_SIZE;
 228         struct mlx4_en_tx_info *tx_info = &ring->tx_info[index];
 229         void *end = ring->buf + ring->buf_size;
 230         __be32 *ptr = (__be32 *)tx_desc;
 231         int i;
 232
 233         /* Optimize the common case when there are no wraparounds */
 234         if (likely((void *)tx_desc + tx_info->nr_txbb * TXBB_SIZE <= end)) {
 235                 /* Stamp the freed descriptor */
 236                 for (i = 0; i < tx_info->nr_txbb * TXBB_SIZE;
 237                      i += STAMP_STRIDE) {
 238                         *ptr = stamp;
 239                         ptr += STAMP_DWORDS;
 240                 }
 241         } else {
 242                 /* Stamp the freed descriptor */
 243                 for (i = 0; i < tx_info->nr_txbb * TXBB_SIZE;
 244                      i += STAMP_STRIDE) {
 245                         *ptr = stamp;
 246                         ptr += STAMP_DWORDS;
 247                         if ((void *)ptr >= end) {
 248                                 ptr = ring->buf;
 249                                 stamp ^= cpu_to_be32(0x80000000);
 250                         }
 251                 }
 252         }
 253 }
 254
 255
 256 static u32 mlx4_en_free_tx_desc(struct mlx4_en_priv *priv,
 257                                 struct mlx4_en_tx_ring *ring,
 258                                 int index, u8 owner, u64 timestamp)
 259 {
 260         struct mlx4_en_dev *mdev = priv->mdev;
 261         struct mlx4_en_tx_info *tx_info = &ring->tx_info[index];
 262         struct mlx4_en_tx_desc *tx_desc = ring->buf + index * TXBB_SIZE;
 263         struct mlx4_wqe_data_seg *data = (void *) tx_desc + tx_info->data_offset;
 264         struct sk_buff *skb = tx_info->skb;
 265         struct skb_frag_struct *frag;
 266         void *end = ring->buf + ring->buf_size;
 267         int frags = skb_shinfo(skb)->nr_frags;
 268         int i;
 269         struct skb_shared_hwtstamps hwts;
 270
 271         if (timestamp) {
 272                 mlx4_en_fill_hwtstamps(mdev, &hwts, timestamp);
 273                 skb_tstamp_tx(skb, &hwts);
 274         }
 275
 276         /* Optimize the common case when there are no wraparounds */
 277         if (likely((void *) tx_desc + tx_info->nr_txbb * TXBB_SIZE <= end)) {
 278                 if (!tx_info->inl) {
 279                         if (tx_info->linear) {
 280                                 dma_unmap_single(priv->ddev,
 281                                         (dma_addr_t) be64_to_cpu(data->addr),
 282                                          be32_to_cpu(data->byte_count),
 283                                          PCI_DMA_TODEVICE);
 284                                 ++data;
 285                         }
 286
 287                         for (i = 0; i < frags; i++) {
 288                                 frag = &skb_shinfo(skb)->frags[i];
 289                                 dma_unmap_page(priv->ddev,
 290                                         (dma_addr_t) be64_to_cpu(data[i].addr),
 291                                         skb_frag_size(frag), PCI_DMA_TODEVICE);
 292                         }
 293                 }
 294         } else {
 295                 if (!tx_info->inl) {
 296                         if ((void *) data >= end) {
 297                                 data = ring->buf + ((void *)data - end);
 298                         }
 299
 300                         if (tx_info->linear) {
 301                                 dma_unmap_single(priv->ddev,
 302                                         (dma_addr_t) be64_to_cpu(data->addr),
 303                                          be32_to_cpu(data->byte_count),
 304                                          PCI_DMA_TODEVICE);
 305                                 ++data;
 306                         }
 307
 308                         for (i = 0; i < frags; i++) {
 309                                 /* Check for wraparound before unmapping */
 310                                 if ((void *) data >= end)
 311                                         data = ring->buf;
 312                                 frag = &skb_shinfo(skb)->frags[i];
 313                                 dma_unmap_page(priv->ddev,
 314                                         (dma_addr_t) be64_to_cpu(data->addr),
 315                                          skb_frag_size(frag), PCI_DMA_TODEVICE);
 316                                 ++data;
 317                         }
 318                 }
 319         }
 320         dev_kfree_skb_any(skb);
 321         return tx_info->nr_txbb;
 322 }
 323
 324
 325 int mlx4_en_free_tx_buf(struct net_device *dev, struct mlx4_en_tx_ring *ring)
 326 {
 327         struct mlx4_en_priv *priv = netdev_priv(dev);
 328         int cnt = 0;
 329
 330         /* Skip last polled descriptor */
 331         ring->cons += ring->last_nr_txbb;
 332         en_dbg(DRV, priv, "Freeing Tx buf - cons:0x%x prod:0x%x\n",
 333                  ring->cons, ring->prod);
 334
 335         if ((u32) (ring->prod - ring->cons) > ring->size) {
 336                 if (netif_msg_tx_err(priv))
 337                         en_warn(priv, "Tx consumer passed producer!\n");
 338                 return 0;
 339         }
 340
 341         while (ring->cons != ring->prod) {
 342                 ring->last_nr_txbb = mlx4_en_free_tx_desc(priv, ring,
 343                                                 ring->cons & ring->size_mask,
 344                                                 !!(ring->cons & ring->size), 0);
 345                 ring->cons += ring->last_nr_txbb;
 346                 cnt++;
 347         }
 348
 349         netdev_tx_reset_queue(ring->tx_queue);
 350
 351         if (cnt)
 352                 en_dbg(DRV, priv, "Freed %d uncompleted tx descriptors\n", cnt);
 353
 354         return cnt;
 355 }
 356
 357 static void mlx4_en_process_tx_cq(struct net_device *dev, struct mlx4_en_cq *cq)
 358 {
 359         struct mlx4_en_priv *priv = netdev_priv(dev);
 360         struct mlx4_cq *mcq = &cq->mcq;
 361         struct mlx4_en_tx_ring *ring = priv->tx_ring[cq->ring];
 362         struct mlx4_cqe *cqe;
 363         u16 index;
 364         u16 new_index, ring_index, stamp_index;
 365         u32 txbbs_skipped = 0;
 366         u32 txbbs_stamp = 0;
 367         u32 cons_index = mcq->cons_index;
 368         int size = cq->size;
 369         u32 size_mask = ring->size_mask;
 370         struct mlx4_cqe *buf = cq->buf;
 371         u32 packets = 0;
 372         u32 bytes = 0;
 373         int factor = priv->cqe_factor;
 374         u64 timestamp = 0;
 375
 376         if (!priv->port_up)
 377                 return;
 378
 379         index = cons_index & size_mask;
 380         cqe = &buf[(index << factor) + factor];
 381         ring_index = ring->cons & size_mask;
 382         stamp_index = ring_index;
 383
 384         /* Process all completed CQEs */
 385         while (XNOR(cqe->owner_sr_opcode & MLX4_CQE_OWNER_MASK,
 386                         cons_index & size)) {
 387                 /*
 388                  * make sure we read the CQE after we read the
 389                  * ownership bit
 390                  */
 391                 rmb();
 392
 393                 if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) ==
 394                              MLX4_CQE_OPCODE_ERROR)) {
 395                         struct mlx4_err_cqe *cqe_err = (struct mlx4_err_cqe *)cqe;
 396
 397                         en_err(priv, "CQE error - vendor syndrome: 0x%x syndrome: 0x%x\n",
 398                                cqe_err->vendor_err_syndrome,
 399                                cqe_err->syndrome);
 400                 }
 401
 402                 /* Skip over last polled CQE */
 403                 new_index = be16_to_cpu(cqe->wqe_index) & size_mask;
 404
 405                 do {
 406                         txbbs_skipped += ring->last_nr_txbb;
 407                         ring_index = (ring_index + ring->last_nr_txbb) & size_mask;
 408                         if (ring->tx_info[ring_index].ts_requested)
 409                                 timestamp = mlx4_en_get_cqe_ts(cqe);
 410
 411                         /* free next descriptor */
 412                         ring->last_nr_txbb = mlx4_en_free_tx_desc(
 413                                         priv, ring, ring_index,
 414                                         !!((ring->cons + txbbs_skipped) &
 415                                         ring->size), timestamp);
 416
 417                         mlx4_en_stamp_wqe(priv, ring, stamp_index,
 418                                           !!((ring->cons + txbbs_stamp) &
 419                                                 ring->size));
 420                         stamp_index = ring_index;
 421                         txbbs_stamp = txbbs_skipped;
 422                         packets++;
 423                         bytes += ring->tx_info[ring_index].nr_bytes;
 424                 } while (ring_index != new_index);
 425
 426                 ++cons_index;
 427                 index = cons_index & size_mask;
 428                 cqe = &buf[(index << factor) + factor];
 429         }
 430
 431
 432         /*
 433          * To prevent CQ overflow we first update CQ consumer and only then
 434          * the ring consumer.
 435          */
 436         mcq->cons_index = cons_index;
 437         mlx4_cq_set_ci(mcq);
 438         wmb();
 439         ring->cons += txbbs_skipped;
 440         netdev_tx_completed_queue(ring->tx_queue, packets, bytes);
 441
 442         /*
 443          * Wakeup Tx queue if this stopped, and at least 1 packet
 444          * was completed
 445          */
 446         if (netif_tx_queue_stopped(ring->tx_queue) && txbbs_skipped > 0) {
 447                 netif_tx_wake_queue(ring->tx_queue);
 448                 priv->port_stats.wake_queue++;
 449         }
 450 }
 451
 452 void mlx4_en_tx_irq(struct mlx4_cq *mcq)
 453 {
 454         struct mlx4_en_cq *cq = container_of(mcq, struct mlx4_en_cq, mcq);
 455         struct mlx4_en_priv *priv = netdev_priv(cq->dev);
 456
 457         mlx4_en_process_tx_cq(cq->dev, cq);
 458         mlx4_en_arm_cq(priv, cq);
 459 }
 460
 461
 462 static struct mlx4_en_tx_desc *mlx4_en_bounce_to_desc(struct mlx4_en_priv *priv,
 463                                                       struct mlx4_en_tx_ring *ring,
 464                                                       u32 index,
 465                                                       unsigned int desc_size)
 466 {
 467         u32 copy = (ring->size - index) * TXBB_SIZE;
 468         int i;
 469
 470         for (i = desc_size - copy - 4; i >= 0; i -= 4) {
 471                 if ((i & (TXBB_SIZE - 1)) == 0)
 472                         wmb();
 473
 474                 *((u32 *) (ring->buf + i)) =
 475                         *((u32 *) (ring->bounce_buf + copy + i));
 476         }
 477
 478         for (i = copy - 4; i >= 4 ; i -= 4) {
 479                 if ((i & (TXBB_SIZE - 1)) == 0)
 480                         wmb();
 481
 482                 *((u32 *) (ring->buf + index * TXBB_SIZE + i)) =
 483                         *((u32 *) (ring->bounce_buf + i));
 484         }
 485
 486         /* Return real descriptor location */
 487         return ring->buf + index * TXBB_SIZE;
 488 }
 489
 490 static int is_inline(struct sk_buff *skb, void **pfrag)
 491 {
 492         void *ptr;
 493
 494         if (inline_thold && !skb_is_gso(skb) && skb->len <= inline_thold) {
 495                 if (skb_shinfo(skb)->nr_frags == 1) {
 496                         ptr = skb_frag_address_safe(&skb_shinfo(skb)->frags[0]);
 497                         if (unlikely(!ptr))
 498                                 return 0;
 499
 500                         if (pfrag)
 501                                 *pfrag = ptr;
 502
 503                         return 1;
 504                 } else if (unlikely(skb_shinfo(skb)->nr_frags))
 505                         return 0;
 506                 else
 507                         return 1;
 508         }
 509
 510         return 0;
 511 }
 512
 513 static int inline_size(struct sk_buff *skb)
 514 {
 515         if (skb->len + CTRL_SIZE + sizeof(struct mlx4_wqe_inline_seg)
 516             <= MLX4_INLINE_ALIGN)
 517                 return ALIGN(skb->len + CTRL_SIZE +
 518                              sizeof(struct mlx4_wqe_inline_seg), 16);
 519         else
 520                 return ALIGN(skb->len + CTRL_SIZE + 2 *
 521                              sizeof(struct mlx4_wqe_inline_seg), 16);
 522 }
 523
 524 static int get_real_size(struct sk_buff *skb, struct net_device *dev,
 525                          int *lso_header_size)
 526 {
 527         struct mlx4_en_priv *priv = netdev_priv(dev);
 528         int real_size;
 529
 530         if (skb_is_gso(skb)) {
 531                 *lso_header_size = skb_transport_offset(skb) + tcp_hdrlen(skb);
 532                 real_size = CTRL_SIZE + skb_shinfo(skb)->nr_frags * DS_SIZE +
 533                         ALIGN(*lso_header_size + 4, DS_SIZE);
 534                 if (unlikely(*lso_header_size != skb_headlen(skb))) {
 535                         /* We add a segment for the skb linear buffer only if
 536                          * it contains data */
 537                         if (*lso_header_size < skb_headlen(skb))
 538                                 real_size += DS_SIZE;
 539                         else {
 540                                 if (netif_msg_tx_err(priv))
 541                                         en_warn(priv, "Non-linear headers\n");
 542                                 return 0;
 543                         }
 544                 }
 545         } else {
 546                 *lso_header_size = 0;
 547                 if (!is_inline(skb, NULL))
 548                         real_size = CTRL_SIZE + (skb_shinfo(skb)->nr_frags + 1) * DS_SIZE;
 549                 else
 550                         real_size = inline_size(skb);
 551         }
 552
 553         return real_size;
 554 }
 555
 556 static void build_inline_wqe(struct mlx4_en_tx_desc *tx_desc, struct sk_buff *skb,
 557                              int real_size, u16 *vlan_tag, int tx_ind, void *fragptr)
 558 {
 559         struct mlx4_wqe_inline_seg *inl = &tx_desc->inl;
 560         int spc = MLX4_INLINE_ALIGN - CTRL_SIZE - sizeof *inl;
 561
 562         if (skb->len <= spc) {
 563                 inl->byte_count = cpu_to_be32(1 << 31 | skb->len);
 564                 skb_copy_from_linear_data(skb, inl + 1, skb_headlen(skb));
 565                 if (skb_shinfo(skb)->nr_frags)
 566                         memcpy(((void *)(inl + 1)) + skb_headlen(skb), fragptr,
 567                                skb_frag_size(&skb_shinfo(skb)->frags[0]));
 568
 569         } else {
 570                 inl->byte_count = cpu_to_be32(1 << 31 | spc);
 571                 if (skb_headlen(skb) <= spc) {
 572                         skb_copy_from_linear_data(skb, inl + 1, skb_headlen(skb));
 573                         if (skb_headlen(skb) < spc) {
 574                                 memcpy(((void *)(inl + 1)) + skb_headlen(skb),
 575                                         fragptr, spc - skb_headlen(skb));
 576                                 fragptr +=  spc - skb_headlen(skb);
 577                         }
 578                         inl = (void *) (inl + 1) + spc;
 579                         memcpy(((void *)(inl + 1)), fragptr, skb->len - spc);
 580                 } else {
 581                         skb_copy_from_linear_data(skb, inl + 1, spc);
 582                         inl = (void *) (inl + 1) + spc;
 583                         skb_copy_from_linear_data_offset(skb, spc, inl + 1,
 584                                         skb_headlen(skb) - spc);
 585                         if (skb_shinfo(skb)->nr_frags)
 586                                 memcpy(((void *)(inl + 1)) + skb_headlen(skb) - spc,
 587                                         fragptr, skb_frag_size(&skb_shinfo(skb)->frags[0]));
 588                 }
 589
 590                 wmb();
 591                 inl->byte_count = cpu_to_be32(1 << 31 | (skb->len - spc));
 592         }
 593 }
 594
 595 u16 mlx4_en_select_queue(struct net_device *dev, struct sk_buff *skb)
 596 {
 597         struct mlx4_en_priv *priv = netdev_priv(dev);
 598         u16 rings_p_up = priv->num_tx_rings_p_up;
 599         u8 up = 0;
 600
 601         if (dev->num_tc)
 602                 return skb_tx_hash(dev, skb);
 603
 604         if (vlan_tx_tag_present(skb))
 605                 up = vlan_tx_tag_get(skb) >> VLAN_PRIO_SHIFT;
 606
 607         return __netdev_pick_tx(dev, skb) % rings_p_up + up * rings_p_up;
 608 }
 609
 610 static void mlx4_bf_copy(void __iomem *dst, unsigned long *src, unsigned bytecnt)
 611 {
 612         __iowrite64_copy(dst, src, bytecnt / 8);
 613 }
 614
 615 netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
 616 {
 617         struct mlx4_en_priv *priv = netdev_priv(dev);
 618         struct mlx4_en_dev *mdev = priv->mdev;
 619         struct device *ddev = priv->ddev;
 620         struct mlx4_en_tx_ring *ring;
 621         struct mlx4_en_tx_desc *tx_desc;
 622         struct mlx4_wqe_data_seg *data;
 623         struct mlx4_en_tx_info *tx_info;
 624         int tx_ind = 0;
 625         int nr_txbb;
 626         int desc_size;
 627         int real_size;
 628         u32 index, bf_index;
 629         __be32 op_own;
 630         u16 vlan_tag = 0;
 631         int i;
 632         int lso_header_size;
 633         void *fragptr;
 634         bool bounce = false;
 635
 636         if (!priv->port_up)
 637                 goto tx_drop;
 638
 639         real_size = get_real_size(skb, dev, &lso_header_size);
 640         if (unlikely(!real_size))
 641                 goto tx_drop;
 642
 643         /* Align descriptor to TXBB size */
 644         desc_size = ALIGN(real_size, TXBB_SIZE);
 645         nr_txbb = desc_size / TXBB_SIZE;
 646         if (unlikely(nr_txbb > MAX_DESC_TXBBS)) {
 647                 if (netif_msg_tx_err(priv))
 648                         en_warn(priv, "Oversized header or SG list\n");
 649                 goto tx_drop;
 650         }
 651
 652         tx_ind = skb->queue_mapping;
 653         ring = priv->tx_ring[tx_ind];
 654         if (vlan_tx_tag_present(skb))
 655                 vlan_tag = vlan_tx_tag_get(skb);
 656
 657         /* Check available TXBBs And 2K spare for prefetch */
 658         if (unlikely(((int)(ring->prod - ring->cons)) >
 659                      ring->size - HEADROOM - MAX_DESC_TXBBS)) {
 660                 /* every full Tx ring stops queue */
 661                 netif_tx_stop_queue(ring->tx_queue);
 662                 priv->port_stats.queue_stopped++;
 663
 664                 /* If queue was emptied after the if, and before the
 665                  * stop_queue - need to wake the queue, or else it will remain
 666                  * stopped forever.
 667                  * Need a memory barrier to make sure ring->cons was not
 668                  * updated before queue was stopped.
 669                  */
 670                 wmb();
 671
 672                 if (unlikely(((int)(ring->prod - ring->cons)) <=
 673                              ring->size - HEADROOM - MAX_DESC_TXBBS)) {
 674                         netif_tx_wake_queue(ring->tx_queue);
 675                         priv->port_stats.wake_queue++;
 676                 } else {
 677                         return NETDEV_TX_BUSY;
 678                 }
 679         }
 680
 681         /* Track current inflight packets for performance analysis */
 682         AVG_PERF_COUNTER(priv->pstats.inflight_avg,
 683                          (u32) (ring->prod - ring->cons - 1));
 684
 685         /* Packet is good - grab an index and transmit it */
 686         index = ring->prod & ring->size_mask;
 687         bf_index = ring->prod;
 688
 689         /* See if we have enough space for whole descriptor TXBB for setting
 690          * SW ownership on next descriptor; if not, use a bounce buffer. */
 691         if (likely(index + nr_txbb <= ring->size))
 692                 tx_desc = ring->buf + index * TXBB_SIZE;
 693         else {
 694                 tx_desc = (struct mlx4_en_tx_desc *) ring->bounce_buf;
 695                 bounce = true;
 696         }
 697
 698         /* Save skb in tx_info ring */
 699         tx_info = &ring->tx_info[index];
 700         tx_info->skb = skb;
 701         tx_info->nr_txbb = nr_txbb;
 702
 703         if (lso_header_size)
 704                 data = ((void *)&tx_desc->lso + ALIGN(lso_header_size + 4,
 705                                                       DS_SIZE));
 706         else
 707                 data = &tx_desc->data;
 708
 709         /* valid only for none inline segments */
 710         tx_info->data_offset = (void *)data - (void *)tx_desc;
 711
 712         tx_info->linear = (lso_header_size < skb_headlen(skb) &&
 713                            !is_inline(skb, NULL)) ? 1 : 0;
 714
 715         data += skb_shinfo(skb)->nr_frags + tx_info->linear - 1;
 716
 717         if (is_inline(skb, &fragptr)) {
 718                 tx_info->inl = 1;
 719         } else {
 720                 /* Map fragments */
 721                 for (i = skb_shinfo(skb)->nr_frags - 1; i >= 0; i--) {
 722                         struct skb_frag_struct *frag;
 723                         dma_addr_t dma;
 724
 725                         frag = &skb_shinfo(skb)->frags[i];
 726                         dma = skb_frag_dma_map(ddev, frag,
 727                                                0, skb_frag_size(frag),
 728                                                DMA_TO_DEVICE);
 729                         if (dma_mapping_error(ddev, dma))
 730                                 goto tx_drop_unmap;
 731
 732                         data->addr = cpu_to_be64(dma);
 733                         data->lkey = cpu_to_be32(mdev->mr.key);
 734                         wmb();
 735                         data->byte_count = cpu_to_be32(skb_frag_size(frag));
 736                         --data;
 737                 }
 738
 739                 /* Map linear part */
 740                 if (tx_info->linear) {
 741                         u32 byte_count = skb_headlen(skb) - lso_header_size;
 742                         dma_addr_t dma;
 743
 744                         dma = dma_map_single(ddev, skb->data +
 745                                              lso_header_size, byte_count,
 746                                              PCI_DMA_TODEVICE);
 747                         if (dma_mapping_error(ddev, dma))
 748                                 goto tx_drop_unmap;
 749
 750                         data->addr = cpu_to_be64(dma);
 751                         data->lkey = cpu_to_be32(mdev->mr.key);
 752                         wmb();
 753                         data->byte_count = cpu_to_be32(byte_count);
 754                 }
 755                 tx_info->inl = 0;
 756         }
 757
 758         /*
 759          * For timestamping add flag to skb_shinfo and
 760          * set flag for further reference
 761          */
 762         if (ring->hwtstamp_tx_type == HWTSTAMP_TX_ON &&
 763             skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) {
 764                 skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
 765                 tx_info->ts_requested = 1;
 766         }
 767
 768         /* Prepare ctrl segement apart opcode+ownership, which depends on
 769          * whether LSO is used */
 770         tx_desc->ctrl.vlan_tag = cpu_to_be16(vlan_tag);
 771         tx_desc->ctrl.ins_vlan = MLX4_WQE_CTRL_INS_VLAN *
 772                 !!vlan_tx_tag_present(skb);
 773         tx_desc->ctrl.fence_size = (real_size / 16) & 0x3f;
 774         tx_desc->ctrl.srcrb_flags = priv->ctrl_flags;
 775         if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
 776                 tx_desc->ctrl.srcrb_flags |= cpu_to_be32(MLX4_WQE_CTRL_IP_CSUM |
 777                                                          MLX4_WQE_CTRL_TCP_UDP_CSUM);
 778                 ring->tx_csum++;
 779         }
 780
 781         if (priv->flags & MLX4_EN_FLAG_ENABLE_HW_LOOPBACK) {
 782                 struct ethhdr *ethh;
 783
 784                 /* Copy dst mac address to wqe. This allows loopback in eSwitch,
 785                  * so that VFs and PF can communicate with each other
 786                  */
 787                 ethh = (struct ethhdr *)skb->data;
 788                 tx_desc->ctrl.srcrb_flags16[0] = get_unaligned((__be16 *)ethh->h_dest);
 789                 tx_desc->ctrl.imm = get_unaligned((__be32 *)(ethh->h_dest + 2));
 790         }
 791
 792         /* Handle LSO (TSO) packets */
 793         if (lso_header_size) {
 794                 /* Mark opcode as LSO */
 795                 op_own = cpu_to_be32(MLX4_OPCODE_LSO | (1 << 6)) |
 796                         ((ring->prod & ring->size) ?
 797                                 cpu_to_be32(MLX4_EN_BIT_DESC_OWN) : 0);
 798
 799                 /* Fill in the LSO prefix */
 800                 tx_desc->lso.mss_hdr_size = cpu_to_be32(
 801                         skb_shinfo(skb)->gso_size << 16 | lso_header_size);
 802
 803                 /* Copy headers;
 804                  * note that we already verified that it is linear */
 805                 memcpy(tx_desc->lso.header, skb->data, lso_header_size);
 806
 807                 priv->port_stats.tso_packets++;
 808                 i = ((skb->len - lso_header_size) / skb_shinfo(skb)->gso_size) +
 809                         !!((skb->len - lso_header_size) % skb_shinfo(skb)->gso_size);
 810                 tx_info->nr_bytes = skb->len + (i - 1) * lso_header_size;
 811                 ring->packets += i;
 812         } else {
 813                 /* Normal (Non LSO) packet */
 814                 op_own = cpu_to_be32(MLX4_OPCODE_SEND) |
 815                         ((ring->prod & ring->size) ?
 816                          cpu_to_be32(MLX4_EN_BIT_DESC_OWN) : 0);
 817                 tx_info->nr_bytes = max_t(unsigned int, skb->len, ETH_ZLEN);
 818                 ring->packets++;
 819
 820         }
 821         ring->bytes += tx_info->nr_bytes;
 822         netdev_tx_sent_queue(ring->tx_queue, tx_info->nr_bytes);
 823         AVG_PERF_COUNTER(priv->pstats.tx_pktsz_avg, skb->len);
 824
 825         if (tx_info->inl) {
 826                 build_inline_wqe(tx_desc, skb, real_size, &vlan_tag, tx_ind, fragptr);
 827                 tx_info->inl = 1;
 828         }
 829
 830         ring->prod += nr_txbb;
 831
 832         /* If we used a bounce buffer then copy descriptor back into place */
 833         if (bounce)
 834                 tx_desc = mlx4_en_bounce_to_desc(priv, ring, index, desc_size);
 835
 836         skb_tx_timestamp(skb);
 837
 838         if (ring->bf_enabled && desc_size <= MAX_BF && !bounce && !vlan_tx_tag_present(skb)) {
 839                 *(__be32 *) (&tx_desc->ctrl.vlan_tag) |= cpu_to_be32(ring->doorbell_qpn);
 840                 op_own |= htonl((bf_index & 0xffff) << 8);
 841                 /* Ensure new descirptor hits memory
 842                 * before setting ownership of this descriptor to HW */
 843                 wmb();
 844                 tx_desc->ctrl.owner_opcode = op_own;
 845
 846                 wmb();
 847
 848                 mlx4_bf_copy(ring->bf.reg + ring->bf.offset, (unsigned long *) &tx_desc->ctrl,
 849                      desc_size);
 850
 851                 wmb();
 852
 853                 ring->bf.offset ^= ring->bf.buf_size;
 854         } else {
 855                 /* Ensure new descirptor hits memory
 856                 * before setting ownership of this descriptor to HW */
 857                 wmb();
 858                 tx_desc->ctrl.owner_opcode = op_own;
 859                 wmb();
 860                 iowrite32be(ring->doorbell_qpn, ring->bf.uar->map + MLX4_SEND_DOORBELL);
 861         }
 862
 863         return NETDEV_TX_OK;
 864
 865 tx_drop_unmap:
 866         en_err(priv, "DMA mapping error\n");
 867
 868         for (i++; i < skb_shinfo(skb)->nr_frags; i++) {
 869                 data++;
 870                 dma_unmap_page(ddev, (dma_addr_t) be64_to_cpu(data->addr),
 871                                be32_to_cpu(data->byte_count),
 872                                PCI_DMA_TODEVICE);
 873         }
 874
 875 tx_drop:
 876         dev_kfree_skb_any(skb);
 877         priv->stats.tx_dropped++;
 878         return NETDEV_TX_OK;
 879 }
 880