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/prefetch.h>
  41 #include <linux/vmalloc.h>
  42 #include <linux/tcp.h>
  43 #include <linux/ip.h>
  44 #include <linux/moduleparam.h>
  45
  46 #include "mlx4_en.h"
  47
  48 int mlx4_en_create_tx_ring(struct mlx4_en_priv *priv,
  49                            struct mlx4_en_tx_ring **pring, u32 size,
  50                            u16 stride, int node, int queue_index)
  51 {
  52         struct mlx4_en_dev *mdev = priv->mdev;
  53         struct mlx4_en_tx_ring *ring;
  54         int tmp;
  55         int err;
  56
  57         ring = kzalloc_node(sizeof(*ring), GFP_KERNEL, node);
  58         if (!ring) {
  59                 ring = kzalloc(sizeof(*ring), GFP_KERNEL);
  60                 if (!ring) {
  61                         en_err(priv, "Failed allocating TX ring\n");
  62                         return -ENOMEM;
  63                 }
  64         }
  65
  66         ring->size = size;
  67         ring->size_mask = size - 1;
  68         ring->stride = stride;
  69         ring->full_size = ring->size - HEADROOM - MAX_DESC_TXBBS;
  70
  71         tmp = size * sizeof(struct mlx4_en_tx_info);
  72         ring->tx_info = kmalloc_node(tmp, GFP_KERNEL | __GFP_NOWARN, node);
  73         if (!ring->tx_info) {
  74                 ring->tx_info = vmalloc(tmp);
  75                 if (!ring->tx_info) {
  76                         err = -ENOMEM;
  77                         goto err_ring;
  78                 }
  79         }
  80
  81         en_dbg(DRV, priv, "Allocated tx_info ring at addr:%p size:%d\n",
  82                  ring->tx_info, tmp);
  83
  84         ring->bounce_buf = kmalloc_node(MAX_DESC_SIZE, GFP_KERNEL, node);
  85         if (!ring->bounce_buf) {
  86                 ring->bounce_buf = kmalloc(MAX_DESC_SIZE, GFP_KERNEL);
  87                 if (!ring->bounce_buf) {
  88                         err = -ENOMEM;
  89                         goto err_info;
  90                 }
  91         }
  92         ring->buf_size = ALIGN(size * ring->stride, MLX4_EN_PAGE_SIZE);
  93
  94         /* Allocate HW buffers on provided NUMA node */
  95         set_dev_node(&mdev->dev->persist->pdev->dev, node);
  96         err = mlx4_alloc_hwq_res(mdev->dev, &ring->wqres, ring->buf_size,
  97                                  2 * PAGE_SIZE);
  98         set_dev_node(&mdev->dev->persist->pdev->dev, mdev->dev->numa_node);
  99         if (err) {
 100                 en_err(priv, "Failed allocating hwq resources\n");
 101                 goto err_bounce;
 102         }
 103
 104         err = mlx4_en_map_buffer(&ring->wqres.buf);
 105         if (err) {
 106                 en_err(priv, "Failed to map TX buffer\n");
 107                 goto err_hwq_res;
 108         }
 109
 110         ring->buf = ring->wqres.buf.direct.buf;
 111
 112         en_dbg(DRV, priv, "Allocated TX ring (addr:%p) - buf:%p size:%d buf_size:%d dma:%llx\n",
 113                ring, ring->buf, ring->size, ring->buf_size,
 114                (unsigned long long) ring->wqres.buf.direct.map);
 115
 116         err = mlx4_qp_reserve_range(mdev->dev, 1, 1, &ring->qpn,
 117                                     MLX4_RESERVE_ETH_BF_QP);
 118         if (err) {
 119                 en_err(priv, "failed reserving qp for TX ring\n");
 120                 goto err_map;
 121         }
 122
 123         err = mlx4_qp_alloc(mdev->dev, ring->qpn, &ring->qp, GFP_KERNEL);
 124         if (err) {
 125                 en_err(priv, "Failed allocating qp %d\n", ring->qpn);
 126                 goto err_reserve;
 127         }
 128         ring->qp.event = mlx4_en_sqp_event;
 129
 130         err = mlx4_bf_alloc(mdev->dev, &ring->bf, node);
 131         if (err) {
 132                 en_dbg(DRV, priv, "working without blueflame (%d)\n", err);
 133                 ring->bf.uar = &mdev->priv_uar;
 134                 ring->bf.uar->map = mdev->uar_map;
 135                 ring->bf_enabled = false;
 136                 ring->bf_alloced = false;
 137                 priv->pflags &= ~MLX4_EN_PRIV_FLAGS_BLUEFLAME;
 138         } else {
 139                 ring->bf_alloced = true;
 140                 ring->bf_enabled = !!(priv->pflags &
 141                                       MLX4_EN_PRIV_FLAGS_BLUEFLAME);
 142         }
 143
 144         ring->hwtstamp_tx_type = priv->hwtstamp_config.tx_type;
 145         ring->queue_index = queue_index;
 146
 147         if (queue_index < priv->num_tx_rings_p_up)
 148                 cpumask_set_cpu(cpumask_local_spread(queue_index,
 149                                                      priv->mdev->dev->numa_node),
 150                                 &ring->affinity_mask);
 151
 152         *pring = ring;
 153         return 0;
 154
 155 err_reserve:
 156         mlx4_qp_release_range(mdev->dev, ring->qpn, 1);
 157 err_map:
 158         mlx4_en_unmap_buffer(&ring->wqres.buf);
 159 err_hwq_res:
 160         mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size);
 161 err_bounce:
 162         kfree(ring->bounce_buf);
 163         ring->bounce_buf = NULL;
 164 err_info:
 165         kvfree(ring->tx_info);
 166         ring->tx_info = NULL;
 167 err_ring:
 168         kfree(ring);
 169         *pring = NULL;
 170         return err;
 171 }
 172
 173 void mlx4_en_destroy_tx_ring(struct mlx4_en_priv *priv,
 174                              struct mlx4_en_tx_ring **pring)
 175 {
 176         struct mlx4_en_dev *mdev = priv->mdev;
 177         struct mlx4_en_tx_ring *ring = *pring;
 178         en_dbg(DRV, priv, "Destroying tx ring, qpn: %d\n", ring->qpn);
 179
 180         if (ring->bf_alloced)
 181                 mlx4_bf_free(mdev->dev, &ring->bf);
 182         mlx4_qp_remove(mdev->dev, &ring->qp);
 183         mlx4_qp_free(mdev->dev, &ring->qp);
 184         mlx4_qp_release_range(priv->mdev->dev, ring->qpn, 1);
 185         mlx4_en_unmap_buffer(&ring->wqres.buf);
 186         mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size);
 187         kfree(ring->bounce_buf);
 188         ring->bounce_buf = NULL;
 189         kvfree(ring->tx_info);
 190         ring->tx_info = NULL;
 191         kfree(ring);
 192         *pring = NULL;
 193 }
 194
 195 int mlx4_en_activate_tx_ring(struct mlx4_en_priv *priv,
 196                              struct mlx4_en_tx_ring *ring,
 197                              int cq, int user_prio)
 198 {
 199         struct mlx4_en_dev *mdev = priv->mdev;
 200         int err;
 201
 202         ring->cqn = cq;
 203         ring->prod = 0;
 204         ring->cons = 0xffffffff;
 205         ring->last_nr_txbb = 1;
 206         memset(ring->tx_info, 0, ring->size * sizeof(struct mlx4_en_tx_info));
 207         memset(ring->buf, 0, ring->buf_size);
 208
 209         ring->qp_state = MLX4_QP_STATE_RST;
 210         ring->doorbell_qpn = cpu_to_be32(ring->qp.qpn << 8);
 211         ring->mr_key = cpu_to_be32(mdev->mr.key);
 212
 213         mlx4_en_fill_qp_context(priv, ring->size, ring->stride, 1, 0, ring->qpn,
 214                                 ring->cqn, user_prio, &ring->context);
 215         if (ring->bf_alloced)
 216                 ring->context.usr_page =
 217                         cpu_to_be32(mlx4_to_hw_uar_index(mdev->dev,
 218                                                          ring->bf.uar->index));
 219
 220         err = mlx4_qp_to_ready(mdev->dev, &ring->wqres.mtt, &ring->context,
 221                                &ring->qp, &ring->qp_state);
 222         if (!cpumask_empty(&ring->affinity_mask))
 223                 netif_set_xps_queue(priv->dev, &ring->affinity_mask,
 224                                     ring->queue_index);
 225
 226         return err;
 227 }
 228
 229 void mlx4_en_deactivate_tx_ring(struct mlx4_en_priv *priv,
 230                                 struct mlx4_en_tx_ring *ring)
 231 {
 232         struct mlx4_en_dev *mdev = priv->mdev;
 233
 234         mlx4_qp_modify(mdev->dev, NULL, ring->qp_state,
 235                        MLX4_QP_STATE_RST, NULL, 0, 0, &ring->qp);
 236 }
 237
 238 static inline bool mlx4_en_is_tx_ring_full(struct mlx4_en_tx_ring *ring)
 239 {
 240         return ring->prod - ring->cons > ring->full_size;
 241 }
 242
 243 static void mlx4_en_stamp_wqe(struct mlx4_en_priv *priv,
 244                               struct mlx4_en_tx_ring *ring, int index,
 245                               u8 owner)
 246 {
 247         __be32 stamp = cpu_to_be32(STAMP_VAL | (!!owner << STAMP_SHIFT));
 248         struct mlx4_en_tx_desc *tx_desc = ring->buf + index * TXBB_SIZE;
 249         struct mlx4_en_tx_info *tx_info = &ring->tx_info[index];
 250         void *end = ring->buf + ring->buf_size;
 251         __be32 *ptr = (__be32 *)tx_desc;
 252         int i;
 253
 254         /* Optimize the common case when there are no wraparounds */
 255         if (likely((void *)tx_desc + tx_info->nr_txbb * TXBB_SIZE <= end)) {
 256                 /* Stamp the freed descriptor */
 257                 for (i = 0; i < tx_info->nr_txbb * TXBB_SIZE;
 258                      i += STAMP_STRIDE) {
 259                         *ptr = stamp;
 260                         ptr += STAMP_DWORDS;
 261                 }
 262         } else {
 263                 /* Stamp the freed descriptor */
 264                 for (i = 0; i < tx_info->nr_txbb * TXBB_SIZE;
 265                      i += STAMP_STRIDE) {
 266                         *ptr = stamp;
 267                         ptr += STAMP_DWORDS;
 268                         if ((void *)ptr >= end) {
 269                                 ptr = ring->buf;
 270                                 stamp ^= cpu_to_be32(0x80000000);
 271                         }
 272                 }
 273         }
 274 }
 275
 276
 277 static u32 mlx4_en_free_tx_desc(struct mlx4_en_priv *priv,
 278                                 struct mlx4_en_tx_ring *ring,
 279                                 int index, u8 owner, u64 timestamp,
 280                                 int napi_mode)
 281 {
 282         struct mlx4_en_tx_info *tx_info = &ring->tx_info[index];
 283         struct mlx4_en_tx_desc *tx_desc = ring->buf + index * TXBB_SIZE;
 284         struct mlx4_wqe_data_seg *data = (void *) tx_desc + tx_info->data_offset;
 285         void *end = ring->buf + ring->buf_size;
 286         struct sk_buff *skb = tx_info->skb;
 287         int nr_maps = tx_info->nr_maps;
 288         int i;
 289
 290         /* We do not touch skb here, so prefetch skb->users location
 291          * to speedup consume_skb()
 292          */
 293         prefetchw(&skb->users);
 294
 295         if (unlikely(timestamp)) {
 296                 struct skb_shared_hwtstamps hwts;
 297
 298                 mlx4_en_fill_hwtstamps(priv->mdev, &hwts, timestamp);
 299                 skb_tstamp_tx(skb, &hwts);
 300         }
 301
 302         /* Optimize the common case when there are no wraparounds */
 303         if (likely((void *) tx_desc + tx_info->nr_txbb * TXBB_SIZE <= end)) {
 304                 if (!tx_info->inl) {
 305                         if (tx_info->linear)
 306                                 dma_unmap_single(priv->ddev,
 307                                                 tx_info->map0_dma,
 308                                                 tx_info->map0_byte_count,
 309                                                 PCI_DMA_TODEVICE);
 310                         else
 311                                 dma_unmap_page(priv->ddev,
 312                                                tx_info->map0_dma,
 313                                                tx_info->map0_byte_count,
 314                                                PCI_DMA_TODEVICE);
 315                         for (i = 1; i < nr_maps; i++) {
 316                                 data++;
 317                                 dma_unmap_page(priv->ddev,
 318                                         (dma_addr_t)be64_to_cpu(data->addr),
 319                                         be32_to_cpu(data->byte_count),
 320                                         PCI_DMA_TODEVICE);
 321                         }
 322                 }
 323         } else {
 324                 if (!tx_info->inl) {
 325                         if ((void *) data >= end) {
 326                                 data = ring->buf + ((void *)data - end);
 327                         }
 328
 329                         if (tx_info->linear)
 330                                 dma_unmap_single(priv->ddev,
 331                                                 tx_info->map0_dma,
 332                                                 tx_info->map0_byte_count,
 333                                                 PCI_DMA_TODEVICE);
 334                         else
 335                                 dma_unmap_page(priv->ddev,
 336                                                tx_info->map0_dma,
 337                                                tx_info->map0_byte_count,
 338                                                PCI_DMA_TODEVICE);
 339                         for (i = 1; i < nr_maps; i++) {
 340                                 data++;
 341                                 /* Check for wraparound before unmapping */
 342                                 if ((void *) data >= end)
 343                                         data = ring->buf;
 344                                 dma_unmap_page(priv->ddev,
 345                                         (dma_addr_t)be64_to_cpu(data->addr),
 346                                         be32_to_cpu(data->byte_count),
 347                                         PCI_DMA_TODEVICE);
 348                         }
 349                 }
 350         }
 351         napi_consume_skb(skb, napi_mode);
 352
 353         return tx_info->nr_txbb;
 354 }
 355
 356
 357 int mlx4_en_free_tx_buf(struct net_device *dev, struct mlx4_en_tx_ring *ring)
 358 {
 359         struct mlx4_en_priv *priv = netdev_priv(dev);
 360         int cnt = 0;
 361
 362         /* Skip last polled descriptor */
 363         ring->cons += ring->last_nr_txbb;
 364         en_dbg(DRV, priv, "Freeing Tx buf - cons:0x%x prod:0x%x\n",
 365                  ring->cons, ring->prod);
 366
 367         if ((u32) (ring->prod - ring->cons) > ring->size) {
 368                 if (netif_msg_tx_err(priv))
 369                         en_warn(priv, "Tx consumer passed producer!\n");
 370                 return 0;
 371         }
 372
 373         while (ring->cons != ring->prod) {
 374                 ring->last_nr_txbb = mlx4_en_free_tx_desc(priv, ring,
 375                                                 ring->cons & ring->size_mask,
 376                                                 !!(ring->cons & ring->size), 0,
 377                                                 0 /* Non-NAPI caller */);
 378                 ring->cons += ring->last_nr_txbb;
 379                 cnt++;
 380         }
 381
 382         netdev_tx_reset_queue(ring->tx_queue);
 383
 384         if (cnt)
 385                 en_dbg(DRV, priv, "Freed %d uncompleted tx descriptors\n", cnt);
 386
 387         return cnt;
 388 }
 389
 390 static bool mlx4_en_process_tx_cq(struct net_device *dev,
 391                                   struct mlx4_en_cq *cq, int napi_budget)
 392 {
 393         struct mlx4_en_priv *priv = netdev_priv(dev);
 394         struct mlx4_cq *mcq = &cq->mcq;
 395         struct mlx4_en_tx_ring *ring = priv->tx_ring[cq->ring];
 396         struct mlx4_cqe *cqe;
 397         u16 index;
 398         u16 new_index, ring_index, stamp_index;
 399         u32 txbbs_skipped = 0;
 400         u32 txbbs_stamp = 0;
 401         u32 cons_index = mcq->cons_index;
 402         int size = cq->size;
 403         u32 size_mask = ring->size_mask;
 404         struct mlx4_cqe *buf = cq->buf;
 405         u32 packets = 0;
 406         u32 bytes = 0;
 407         int factor = priv->cqe_factor;
 408         u64 timestamp = 0;
 409         int done = 0;
 410         int budget = priv->tx_work_limit;
 411         u32 last_nr_txbb;
 412         u32 ring_cons;
 413
 414         if (!priv->port_up)
 415                 return true;
 416
 417         netdev_txq_bql_complete_prefetchw(ring->tx_queue);
 418
 419         index = cons_index & size_mask;
 420         cqe = mlx4_en_get_cqe(buf, index, priv->cqe_size) + factor;
 421         last_nr_txbb = ACCESS_ONCE(ring->last_nr_txbb);
 422         ring_cons = ACCESS_ONCE(ring->cons);
 423         ring_index = ring_cons & size_mask;
 424         stamp_index = ring_index;
 425
 426         /* Process all completed CQEs */
 427         while (XNOR(cqe->owner_sr_opcode & MLX4_CQE_OWNER_MASK,
 428                         cons_index & size) && (done < budget)) {
 429                 /*
 430                  * make sure we read the CQE after we read the
 431                  * ownership bit
 432                  */
 433                 dma_rmb();
 434
 435                 if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) ==
 436                              MLX4_CQE_OPCODE_ERROR)) {
 437                         struct mlx4_err_cqe *cqe_err = (struct mlx4_err_cqe *)cqe;
 438
 439                         en_err(priv, "CQE error - vendor syndrome: 0x%x syndrome: 0x%x\n",
 440                                cqe_err->vendor_err_syndrome,
 441                                cqe_err->syndrome);
 442                 }
 443
 444                 /* Skip over last polled CQE */
 445                 new_index = be16_to_cpu(cqe->wqe_index) & size_mask;
 446
 447                 do {
 448                         txbbs_skipped += last_nr_txbb;
 449                         ring_index = (ring_index + last_nr_txbb) & size_mask;
 450                         if (ring->tx_info[ring_index].ts_requested)
 451                                 timestamp = mlx4_en_get_cqe_ts(cqe);
 452
 453                         /* free next descriptor */
 454                         last_nr_txbb = mlx4_en_free_tx_desc(
 455                                         priv, ring, ring_index,
 456                                         !!((ring_cons + txbbs_skipped) &
 457                                         ring->size), timestamp, napi_budget);
 458
 459                         mlx4_en_stamp_wqe(priv, ring, stamp_index,
 460                                           !!((ring_cons + txbbs_stamp) &
 461                                                 ring->size));
 462                         stamp_index = ring_index;
 463                         txbbs_stamp = txbbs_skipped;
 464                         packets++;
 465                         bytes += ring->tx_info[ring_index].nr_bytes;
 466                 } while ((++done < budget) && (ring_index != new_index));
 467
 468                 ++cons_index;
 469                 index = cons_index & size_mask;
 470                 cqe = mlx4_en_get_cqe(buf, index, priv->cqe_size) + factor;
 471         }
 472
 473
 474         /*
 475          * To prevent CQ overflow we first update CQ consumer and only then
 476          * the ring consumer.
 477          */
 478         mcq->cons_index = cons_index;
 479         mlx4_cq_set_ci(mcq);
 480         wmb();
 481
 482         /* we want to dirty this cache line once */
 483         ACCESS_ONCE(ring->last_nr_txbb) = last_nr_txbb;
 484         ACCESS_ONCE(ring->cons) = ring_cons + txbbs_skipped;
 485
 486         netdev_tx_completed_queue(ring->tx_queue, packets, bytes);
 487
 488         /* Wakeup Tx queue if this stopped, and ring is not full.
 489          */
 490         if (netif_tx_queue_stopped(ring->tx_queue) &&
 491             !mlx4_en_is_tx_ring_full(ring)) {
 492                 netif_tx_wake_queue(ring->tx_queue);
 493                 ring->wake_queue++;
 494         }
 495         return done < budget;
 496 }
 497
 498 void mlx4_en_tx_irq(struct mlx4_cq *mcq)
 499 {
 500         struct mlx4_en_cq *cq = container_of(mcq, struct mlx4_en_cq, mcq);
 501         struct mlx4_en_priv *priv = netdev_priv(cq->dev);
 502
 503         if (likely(priv->port_up))
 504                 napi_schedule_irqoff(&cq->napi);
 505         else
 506                 mlx4_en_arm_cq(priv, cq);
 507 }
 508
 509 /* TX CQ polling - called by NAPI */
 510 int mlx4_en_poll_tx_cq(struct napi_struct *napi, int budget)
 511 {
 512         struct mlx4_en_cq *cq = container_of(napi, struct mlx4_en_cq, napi);
 513         struct net_device *dev = cq->dev;
 514         struct mlx4_en_priv *priv = netdev_priv(dev);
 515         int clean_complete;
 516
 517         clean_complete = mlx4_en_process_tx_cq(dev, cq, budget);
 518         if (!clean_complete)
 519                 return budget;
 520
 521         napi_complete(napi);
 522         mlx4_en_arm_cq(priv, cq);
 523
 524         return 0;
 525 }
 526
 527 static struct mlx4_en_tx_desc *mlx4_en_bounce_to_desc(struct mlx4_en_priv *priv,
 528                                                       struct mlx4_en_tx_ring *ring,
 529                                                       u32 index,
 530                                                       unsigned int desc_size)
 531 {
 532         u32 copy = (ring->size - index) * TXBB_SIZE;
 533         int i;
 534
 535         for (i = desc_size - copy - 4; i >= 0; i -= 4) {
 536                 if ((i & (TXBB_SIZE - 1)) == 0)
 537                         wmb();
 538
 539                 *((u32 *) (ring->buf + i)) =
 540                         *((u32 *) (ring->bounce_buf + copy + i));
 541         }
 542
 543         for (i = copy - 4; i >= 4 ; i -= 4) {
 544                 if ((i & (TXBB_SIZE - 1)) == 0)
 545                         wmb();
 546
 547                 *((u32 *) (ring->buf + index * TXBB_SIZE + i)) =
 548                         *((u32 *) (ring->bounce_buf + i));
 549         }
 550
 551         /* Return real descriptor location */
 552         return ring->buf + index * TXBB_SIZE;
 553 }
 554
 555 /* Decide if skb can be inlined in tx descriptor to avoid dma mapping
 556  *
 557  * It seems strange we do not simply use skb_copy_bits().
 558  * This would allow to inline all skbs iff skb->len <= inline_thold
 559  *
 560  * Note that caller already checked skb was not a gso packet
 561  */
 562 static bool is_inline(int inline_thold, const struct sk_buff *skb,
 563                       const struct skb_shared_info *shinfo,
 564                       void **pfrag)
 565 {
 566         void *ptr;
 567
 568         if (skb->len > inline_thold || !inline_thold)
 569                 return false;
 570
 571         if (shinfo->nr_frags == 1) {
 572                 ptr = skb_frag_address_safe(&shinfo->frags[0]);
 573                 if (unlikely(!ptr))
 574                         return false;
 575                 *pfrag = ptr;
 576                 return true;
 577         }
 578         if (shinfo->nr_frags)
 579                 return false;
 580         return true;
 581 }
 582
 583 static int inline_size(const struct sk_buff *skb)
 584 {
 585         if (skb->len + CTRL_SIZE + sizeof(struct mlx4_wqe_inline_seg)
 586             <= MLX4_INLINE_ALIGN)
 587                 return ALIGN(skb->len + CTRL_SIZE +
 588                              sizeof(struct mlx4_wqe_inline_seg), 16);
 589         else
 590                 return ALIGN(skb->len + CTRL_SIZE + 2 *
 591                              sizeof(struct mlx4_wqe_inline_seg), 16);
 592 }
 593
 594 static int get_real_size(const struct sk_buff *skb,
 595                          const struct skb_shared_info *shinfo,
 596                          struct net_device *dev,
 597                          int *lso_header_size,
 598                          bool *inline_ok,
 599                          void **pfrag)
 600 {
 601         struct mlx4_en_priv *priv = netdev_priv(dev);
 602         int real_size;
 603
 604         if (shinfo->gso_size) {
 605                 *inline_ok = false;
 606                 if (skb->encapsulation)
 607                         *lso_header_size = (skb_inner_transport_header(skb) - skb->data) + inner_tcp_hdrlen(skb);
 608                 else
 609                         *lso_header_size = skb_transport_offset(skb) + tcp_hdrlen(skb);
 610                 real_size = CTRL_SIZE + shinfo->nr_frags * DS_SIZE +
 611                         ALIGN(*lso_header_size + 4, DS_SIZE);
 612                 if (unlikely(*lso_header_size != skb_headlen(skb))) {
 613                         /* We add a segment for the skb linear buffer only if
 614                          * it contains data */
 615                         if (*lso_header_size < skb_headlen(skb))
 616                                 real_size += DS_SIZE;
 617                         else {
 618                                 if (netif_msg_tx_err(priv))
 619                                         en_warn(priv, "Non-linear headers\n");
 620                                 return 0;
 621                         }
 622                 }
 623         } else {
 624                 *lso_header_size = 0;
 625                 *inline_ok = is_inline(priv->prof->inline_thold, skb,
 626                                        shinfo, pfrag);
 627
 628                 if (*inline_ok)
 629                         real_size = inline_size(skb);
 630                 else
 631                         real_size = CTRL_SIZE +
 632                                     (shinfo->nr_frags + 1) * DS_SIZE;
 633         }
 634
 635         return real_size;
 636 }
 637
 638 static void build_inline_wqe(struct mlx4_en_tx_desc *tx_desc,
 639                              const struct sk_buff *skb,
 640                              const struct skb_shared_info *shinfo,
 641                              int real_size, u16 *vlan_tag,
 642                              int tx_ind, void *fragptr)
 643 {
 644         struct mlx4_wqe_inline_seg *inl = &tx_desc->inl;
 645         int spc = MLX4_INLINE_ALIGN - CTRL_SIZE - sizeof *inl;
 646         unsigned int hlen = skb_headlen(skb);
 647
 648         if (skb->len <= spc) {
 649                 if (likely(skb->len >= MIN_PKT_LEN)) {
 650                         inl->byte_count = cpu_to_be32(1 << 31 | skb->len);
 651                 } else {
 652                         inl->byte_count = cpu_to_be32(1 << 31 | MIN_PKT_LEN);
 653                         memset(((void *)(inl + 1)) + skb->len, 0,
 654                                MIN_PKT_LEN - skb->len);
 655                 }
 656                 skb_copy_from_linear_data(skb, inl + 1, hlen);
 657                 if (shinfo->nr_frags)
 658                         memcpy(((void *)(inl + 1)) + hlen, fragptr,
 659                                skb_frag_size(&shinfo->frags[0]));
 660
 661         } else {
 662                 inl->byte_count = cpu_to_be32(1 << 31 | spc);
 663                 if (hlen <= spc) {
 664                         skb_copy_from_linear_data(skb, inl + 1, hlen);
 665                         if (hlen < spc) {
 666                                 memcpy(((void *)(inl + 1)) + hlen,
 667                                        fragptr, spc - hlen);
 668                                 fragptr +=  spc - hlen;
 669                         }
 670                         inl = (void *) (inl + 1) + spc;
 671                         memcpy(((void *)(inl + 1)), fragptr, skb->len - spc);
 672                 } else {
 673                         skb_copy_from_linear_data(skb, inl + 1, spc);
 674                         inl = (void *) (inl + 1) + spc;
 675                         skb_copy_from_linear_data_offset(skb, spc, inl + 1,
 676                                                          hlen - spc);
 677                         if (shinfo->nr_frags)
 678                                 memcpy(((void *)(inl + 1)) + hlen - spc,
 679                                        fragptr,
 680                                        skb_frag_size(&shinfo->frags[0]));
 681                 }
 682
 683                 dma_wmb();
 684                 inl->byte_count = cpu_to_be32(1 << 31 | (skb->len - spc));
 685         }
 686 }
 687
 688 u16 mlx4_en_select_queue(struct net_device *dev, struct sk_buff *skb,
 689                          void *accel_priv, select_queue_fallback_t fallback)
 690 {
 691         struct mlx4_en_priv *priv = netdev_priv(dev);
 692         u16 rings_p_up = priv->num_tx_rings_p_up;
 693         u8 up = 0;
 694
 695         if (dev->num_tc)
 696                 return skb_tx_hash(dev, skb);
 697
 698         if (skb_vlan_tag_present(skb))
 699                 up = skb_vlan_tag_get(skb) >> VLAN_PRIO_SHIFT;
 700
 701         return fallback(dev, skb) % rings_p_up + up * rings_p_up;
 702 }
 703
 704 static void mlx4_bf_copy(void __iomem *dst, const void *src,
 705                          unsigned int bytecnt)
 706 {
 707         __iowrite64_copy(dst, src, bytecnt / 8);
 708 }
 709
 710 netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
 711 {
 712         struct skb_shared_info *shinfo = skb_shinfo(skb);
 713         struct mlx4_en_priv *priv = netdev_priv(dev);
 714         struct device *ddev = priv->ddev;
 715         struct mlx4_en_tx_ring *ring;
 716         struct mlx4_en_tx_desc *tx_desc;
 717         struct mlx4_wqe_data_seg *data;
 718         struct mlx4_en_tx_info *tx_info;
 719         int tx_ind = 0;
 720         int nr_txbb;
 721         int desc_size;
 722         int real_size;
 723         u32 index, bf_index;
 724         __be32 op_own;
 725         u16 vlan_tag = 0;
 726         u16 vlan_proto = 0;
 727         int i_frag;
 728         int lso_header_size;
 729         void *fragptr = NULL;
 730         bool bounce = false;
 731         bool send_doorbell;
 732         bool stop_queue;
 733         bool inline_ok;
 734         u32 ring_cons;
 735
 736         if (!priv->port_up)
 737                 goto tx_drop;
 738
 739         tx_ind = skb_get_queue_mapping(skb);
 740         ring = priv->tx_ring[tx_ind];
 741
 742         /* fetch ring->cons far ahead before needing it to avoid stall */
 743         ring_cons = ACCESS_ONCE(ring->cons);
 744
 745         real_size = get_real_size(skb, shinfo, dev, &lso_header_size,
 746                                   &inline_ok, &fragptr);
 747         if (unlikely(!real_size))
 748                 goto tx_drop;
 749
 750         /* Align descriptor to TXBB size */
 751         desc_size = ALIGN(real_size, TXBB_SIZE);
 752         nr_txbb = desc_size / TXBB_SIZE;
 753         if (unlikely(nr_txbb > MAX_DESC_TXBBS)) {
 754                 if (netif_msg_tx_err(priv))
 755                         en_warn(priv, "Oversized header or SG list\n");
 756                 goto tx_drop;
 757         }
 758
 759         if (skb_vlan_tag_present(skb)) {
 760                 vlan_tag = skb_vlan_tag_get(skb);
 761                 vlan_proto = be16_to_cpu(skb->vlan_proto);
 762         }
 763
 764         netdev_txq_bql_enqueue_prefetchw(ring->tx_queue);
 765
 766         /* Track current inflight packets for performance analysis */
 767         AVG_PERF_COUNTER(priv->pstats.inflight_avg,
 768                          (u32)(ring->prod - ring_cons - 1));
 769
 770         /* Packet is good - grab an index and transmit it */
 771         index = ring->prod & ring->size_mask;
 772         bf_index = ring->prod;
 773
 774         /* See if we have enough space for whole descriptor TXBB for setting
 775          * SW ownership on next descriptor; if not, use a bounce buffer. */
 776         if (likely(index + nr_txbb <= ring->size))
 777                 tx_desc = ring->buf + index * TXBB_SIZE;
 778         else {
 779                 tx_desc = (struct mlx4_en_tx_desc *) ring->bounce_buf;
 780                 bounce = true;
 781         }
 782
 783         /* Save skb in tx_info ring */
 784         tx_info = &ring->tx_info[index];
 785         tx_info->skb = skb;
 786         tx_info->nr_txbb = nr_txbb;
 787
 788         data = &tx_desc->data;
 789         if (lso_header_size)
 790                 data = ((void *)&tx_desc->lso + ALIGN(lso_header_size + 4,
 791                                                       DS_SIZE));
 792
 793         /* valid only for none inline segments */
 794         tx_info->data_offset = (void *)data - (void *)tx_desc;
 795
 796         tx_info->inl = inline_ok;
 797
 798         tx_info->linear = (lso_header_size < skb_headlen(skb) &&
 799                            !inline_ok) ? 1 : 0;
 800
 801         tx_info->nr_maps = shinfo->nr_frags + tx_info->linear;
 802         data += tx_info->nr_maps - 1;
 803
 804         if (!tx_info->inl) {
 805                 dma_addr_t dma = 0;
 806                 u32 byte_count = 0;
 807
 808                 /* Map fragments if any */
 809                 for (i_frag = shinfo->nr_frags - 1; i_frag >= 0; i_frag--) {
 810                         const struct skb_frag_struct *frag;
 811
 812                         frag = &shinfo->frags[i_frag];
 813                         byte_count = skb_frag_size(frag);
 814                         dma = skb_frag_dma_map(ddev, frag,
 815                                                0, byte_count,
 816                                                DMA_TO_DEVICE);
 817                         if (dma_mapping_error(ddev, dma))
 818                                 goto tx_drop_unmap;
 819
 820                         data->addr = cpu_to_be64(dma);
 821                         data->lkey = ring->mr_key;
 822                         dma_wmb();
 823                         data->byte_count = cpu_to_be32(byte_count);
 824                         --data;
 825                 }
 826
 827                 /* Map linear part if needed */
 828                 if (tx_info->linear) {
 829                         byte_count = skb_headlen(skb) - lso_header_size;
 830
 831                         dma = dma_map_single(ddev, skb->data +
 832                                              lso_header_size, byte_count,
 833                                              PCI_DMA_TODEVICE);
 834                         if (dma_mapping_error(ddev, dma))
 835                                 goto tx_drop_unmap;
 836
 837                         data->addr = cpu_to_be64(dma);
 838                         data->lkey = ring->mr_key;
 839                         dma_wmb();
 840                         data->byte_count = cpu_to_be32(byte_count);
 841                 }
 842                 /* tx completion can avoid cache line miss for common cases */
 843                 tx_info->map0_dma = dma;
 844                 tx_info->map0_byte_count = byte_count;
 845         }
 846
 847         /*
 848          * For timestamping add flag to skb_shinfo and
 849          * set flag for further reference
 850          */
 851         tx_info->ts_requested = 0;
 852         if (unlikely(ring->hwtstamp_tx_type == HWTSTAMP_TX_ON &&
 853                      shinfo->tx_flags & SKBTX_HW_TSTAMP)) {
 854                 shinfo->tx_flags |= SKBTX_IN_PROGRESS;
 855                 tx_info->ts_requested = 1;
 856         }
 857
 858         /* Prepare ctrl segement apart opcode+ownership, which depends on
 859          * whether LSO is used */
 860         tx_desc->ctrl.srcrb_flags = priv->ctrl_flags;
 861         if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
 862                 if (!skb->encapsulation)
 863                         tx_desc->ctrl.srcrb_flags |= cpu_to_be32(MLX4_WQE_CTRL_IP_CSUM |
 864                                                                  MLX4_WQE_CTRL_TCP_UDP_CSUM);
 865                 else
 866                         tx_desc->ctrl.srcrb_flags |= cpu_to_be32(MLX4_WQE_CTRL_IP_CSUM);
 867                 ring->tx_csum++;
 868         }
 869
 870         if (priv->flags & MLX4_EN_FLAG_ENABLE_HW_LOOPBACK) {
 871                 struct ethhdr *ethh;
 872
 873                 /* Copy dst mac address to wqe. This allows loopback in eSwitch,
 874                  * so that VFs and PF can communicate with each other
 875                  */
 876                 ethh = (struct ethhdr *)skb->data;
 877                 tx_desc->ctrl.srcrb_flags16[0] = get_unaligned((__be16 *)ethh->h_dest);
 878                 tx_desc->ctrl.imm = get_unaligned((__be32 *)(ethh->h_dest + 2));
 879         }
 880
 881         /* Handle LSO (TSO) packets */
 882         if (lso_header_size) {
 883                 int i;
 884
 885                 /* Mark opcode as LSO */
 886                 op_own = cpu_to_be32(MLX4_OPCODE_LSO | (1 << 6)) |
 887                         ((ring->prod & ring->size) ?
 888                                 cpu_to_be32(MLX4_EN_BIT_DESC_OWN) : 0);
 889
 890                 /* Fill in the LSO prefix */
 891                 tx_desc->lso.mss_hdr_size = cpu_to_be32(
 892                         shinfo->gso_size << 16 | lso_header_size);
 893
 894                 /* Copy headers;
 895                  * note that we already verified that it is linear */
 896                 memcpy(tx_desc->lso.header, skb->data, lso_header_size);
 897
 898                 ring->tso_packets++;
 899
 900                 i = ((skb->len - lso_header_size) / shinfo->gso_size) +
 901                         !!((skb->len - lso_header_size) % shinfo->gso_size);
 902                 tx_info->nr_bytes = skb->len + (i - 1) * lso_header_size;
 903                 ring->packets += i;
 904         } else {
 905                 /* Normal (Non LSO) packet */
 906                 op_own = cpu_to_be32(MLX4_OPCODE_SEND) |
 907                         ((ring->prod & ring->size) ?
 908                          cpu_to_be32(MLX4_EN_BIT_DESC_OWN) : 0);
 909                 tx_info->nr_bytes = max_t(unsigned int, skb->len, ETH_ZLEN);
 910                 ring->packets++;
 911         }
 912         ring->bytes += tx_info->nr_bytes;
 913         netdev_tx_sent_queue(ring->tx_queue, tx_info->nr_bytes);
 914         AVG_PERF_COUNTER(priv->pstats.tx_pktsz_avg, skb->len);
 915
 916         if (tx_info->inl)
 917                 build_inline_wqe(tx_desc, skb, shinfo, real_size, &vlan_tag,
 918                                  tx_ind, fragptr);
 919
 920         if (skb->encapsulation) {
 921                 struct iphdr *ipv4 = (struct iphdr *)skb_inner_network_header(skb);
 922                 if (ipv4->protocol == IPPROTO_TCP || ipv4->protocol == IPPROTO_UDP)
 923                         op_own |= cpu_to_be32(MLX4_WQE_CTRL_IIP | MLX4_WQE_CTRL_ILP);
 924                 else
 925                         op_own |= cpu_to_be32(MLX4_WQE_CTRL_IIP);
 926         }
 927
 928         ring->prod += nr_txbb;
 929
 930         /* If we used a bounce buffer then copy descriptor back into place */
 931         if (unlikely(bounce))
 932                 tx_desc = mlx4_en_bounce_to_desc(priv, ring, index, desc_size);
 933
 934         skb_tx_timestamp(skb);
 935
 936         /* Check available TXBBs And 2K spare for prefetch */
 937         stop_queue = mlx4_en_is_tx_ring_full(ring);
 938         if (unlikely(stop_queue)) {
 939                 netif_tx_stop_queue(ring->tx_queue);
 940                 ring->queue_stopped++;
 941         }
 942         send_doorbell = !skb->xmit_more || netif_xmit_stopped(ring->tx_queue);
 943
 944         real_size = (real_size / 16) & 0x3f;
 945
 946         if (ring->bf_enabled && desc_size <= MAX_BF && !bounce &&
 947             !skb_vlan_tag_present(skb) && send_doorbell) {
 948                 tx_desc->ctrl.bf_qpn = ring->doorbell_qpn |
 949                                        cpu_to_be32(real_size);
 950
 951                 op_own |= htonl((bf_index & 0xffff) << 8);
 952                 /* Ensure new descriptor hits memory
 953                  * before setting ownership of this descriptor to HW
 954                  */
 955                 dma_wmb();
 956                 tx_desc->ctrl.owner_opcode = op_own;
 957
 958                 wmb();
 959
 960                 mlx4_bf_copy(ring->bf.reg + ring->bf.offset, &tx_desc->ctrl,
 961                              desc_size);
 962
 963                 wmb();
 964
 965                 ring->bf.offset ^= ring->bf.buf_size;
 966         } else {
 967                 tx_desc->ctrl.vlan_tag = cpu_to_be16(vlan_tag);
 968                 if (vlan_proto == ETH_P_8021AD)
 969                         tx_desc->ctrl.ins_vlan = MLX4_WQE_CTRL_INS_SVLAN;
 970                 else if (vlan_proto == ETH_P_8021Q)
 971                         tx_desc->ctrl.ins_vlan = MLX4_WQE_CTRL_INS_CVLAN;
 972                 else
 973                         tx_desc->ctrl.ins_vlan = 0;
 974
 975                 tx_desc->ctrl.fence_size = real_size;
 976
 977                 /* Ensure new descriptor hits memory
 978                  * before setting ownership of this descriptor to HW
 979                  */
 980                 dma_wmb();
 981                 tx_desc->ctrl.owner_opcode = op_own;
 982                 if (send_doorbell) {
 983                         wmb();
 984                         /* Since there is no iowrite*_native() that writes the
 985                          * value as is, without byteswapping - using the one
 986                          * the doesn't do byteswapping in the relevant arch
 987                          * endianness.
 988                          */
 989 #if defined(__LITTLE_ENDIAN)
 990                         iowrite32(
 991 #else
 992                         iowrite32be(
 993 #endif
 994                                   ring->doorbell_qpn,
 995                                   ring->bf.uar->map + MLX4_SEND_DOORBELL);
 996                 } else {
 997                         ring->xmit_more++;
 998                 }
 999         }
1000
1001         if (unlikely(stop_queue)) {
1002                 /* If queue was emptied after the if (stop_queue) , and before
1003                  * the netif_tx_stop_queue() - need to wake the queue,
1004                  * or else it will remain stopped forever.
1005                  * Need a memory barrier to make sure ring->cons was not
1006                  * updated before queue was stopped.
1007                  */
1008                 smp_rmb();
1009
1010                 ring_cons = ACCESS_ONCE(ring->cons);
1011                 if (unlikely(!mlx4_en_is_tx_ring_full(ring))) {
1012                         netif_tx_wake_queue(ring->tx_queue);
1013                         ring->wake_queue++;
1014                 }
1015         }
1016         return NETDEV_TX_OK;
1017
1018 tx_drop_unmap:
1019         en_err(priv, "DMA mapping error\n");
1020
1021         while (++i_frag < shinfo->nr_frags) {
1022                 ++data;
1023                 dma_unmap_page(ddev, (dma_addr_t) be64_to_cpu(data->addr),
1024                                be32_to_cpu(data->byte_count),
1025                                PCI_DMA_TODEVICE);
1026         }
1027
1028 tx_drop:
1029         dev_kfree_skb_any(skb);
1030         priv->stats.tx_dropped++;
1031         return NETDEV_TX_OK;
1032 }
1033