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/ipv6.h> 45 #include <linux/indirect_call_wrapper.h> 46 #include <net/ipv6.h> 47 48 #include "mlx4_en.h" 49 50 int mlx4_en_create_tx_ring(struct mlx4_en_priv *priv, 51 struct mlx4_en_tx_ring **pring, u32 size, 52 u16 stride, int node, int queue_index) 53 { 54 struct mlx4_en_dev *mdev = priv->mdev; 55 struct mlx4_en_tx_ring *ring; 56 int tmp; 57 int err; 58 59 ring = kzalloc_node(sizeof(*ring), GFP_KERNEL, node); 60 if (!ring) { 61 en_err(priv, "Failed allocating TX ring\n"); 62 return -ENOMEM; 63 } 64 65 ring->size = size; 66 ring->size_mask = size - 1; 67 ring->sp_stride = stride; 68 ring->full_size = ring->size - HEADROOM - MAX_DESC_TXBBS; 69 70 tmp = size * sizeof(struct mlx4_en_tx_info); 71 ring->tx_info = kvmalloc_node(tmp, GFP_KERNEL, node); 72 if (!ring->tx_info) { 73 err = -ENOMEM; 74 goto err_ring; 75 } 76 77 en_dbg(DRV, priv, "Allocated tx_info ring at addr:%p size:%d\n", 78 ring->tx_info, tmp); 79 80 ring->bounce_buf = kmalloc_node(MAX_DESC_SIZE, GFP_KERNEL, node); 81 if (!ring->bounce_buf) { 82 ring->bounce_buf = kmalloc(MAX_DESC_SIZE, GFP_KERNEL); 83 if (!ring->bounce_buf) { 84 err = -ENOMEM; 85 goto err_info; 86 } 87 } 88 ring->buf_size = ALIGN(size * ring->sp_stride, MLX4_EN_PAGE_SIZE); 89 90 /* Allocate HW buffers on provided NUMA node */ 91 set_dev_node(&mdev->dev->persist->pdev->dev, node); 92 err = mlx4_alloc_hwq_res(mdev->dev, &ring->sp_wqres, ring->buf_size); 93 set_dev_node(&mdev->dev->persist->pdev->dev, mdev->dev->numa_node); 94 if (err) { 95 en_err(priv, "Failed allocating hwq resources\n"); 96 goto err_bounce; 97 } 98 99 ring->buf = ring->sp_wqres.buf.direct.buf; 100 101 en_dbg(DRV, priv, "Allocated TX ring (addr:%p) - buf:%p size:%d buf_size:%d dma:%llx\n", 102 ring, ring->buf, ring->size, ring->buf_size, 103 (unsigned long long) ring->sp_wqres.buf.direct.map); 104 105 err = mlx4_qp_reserve_range(mdev->dev, 1, 1, &ring->qpn, 106 MLX4_RESERVE_ETH_BF_QP, 107 MLX4_RES_USAGE_DRIVER); 108 if (err) { 109 en_err(priv, "failed reserving qp for TX ring\n"); 110 goto err_hwq_res; 111 } 112 113 err = mlx4_qp_alloc(mdev->dev, ring->qpn, &ring->sp_qp); 114 if (err) { 115 en_err(priv, "Failed allocating qp %d\n", ring->qpn); 116 goto err_reserve; 117 } 118 ring->sp_qp.event = mlx4_en_sqp_event; 119 120 err = mlx4_bf_alloc(mdev->dev, &ring->bf, node); 121 if (err) { 122 en_dbg(DRV, priv, "working without blueflame (%d)\n", err); 123 ring->bf.uar = &mdev->priv_uar; 124 ring->bf.uar->map = mdev->uar_map; 125 ring->bf_enabled = false; 126 ring->bf_alloced = false; 127 priv->pflags &= ~MLX4_EN_PRIV_FLAGS_BLUEFLAME; 128 } else { 129 ring->bf_alloced = true; 130 ring->bf_enabled = !!(priv->pflags & 131 MLX4_EN_PRIV_FLAGS_BLUEFLAME); 132 } 133 ring->doorbell_address = ring->bf.uar->map + MLX4_SEND_DOORBELL; 134 135 ring->hwtstamp_tx_type = priv->hwtstamp_config.tx_type; 136 ring->queue_index = queue_index; 137 138 if (queue_index < priv->num_tx_rings_p_up) 139 cpumask_set_cpu(cpumask_local_spread(queue_index, 140 priv->mdev->dev->numa_node), 141 &ring->sp_affinity_mask); 142 143 *pring = ring; 144 return 0; 145 146 err_reserve: 147 mlx4_qp_release_range(mdev->dev, ring->qpn, 1); 148 err_hwq_res: 149 mlx4_free_hwq_res(mdev->dev, &ring->sp_wqres, ring->buf_size); 150 err_bounce: 151 kfree(ring->bounce_buf); 152 ring->bounce_buf = NULL; 153 err_info: 154 kvfree(ring->tx_info); 155 ring->tx_info = NULL; 156 err_ring: 157 kfree(ring); 158 *pring = NULL; 159 return err; 160 } 161 162 void mlx4_en_destroy_tx_ring(struct mlx4_en_priv *priv, 163 struct mlx4_en_tx_ring **pring) 164 { 165 struct mlx4_en_dev *mdev = priv->mdev; 166 struct mlx4_en_tx_ring *ring = *pring; 167 en_dbg(DRV, priv, "Destroying tx ring, qpn: %d\n", ring->qpn); 168 169 if (ring->bf_alloced) 170 mlx4_bf_free(mdev->dev, &ring->bf); 171 mlx4_qp_remove(mdev->dev, &ring->sp_qp); 172 mlx4_qp_free(mdev->dev, &ring->sp_qp); 173 mlx4_qp_release_range(priv->mdev->dev, ring->qpn, 1); 174 mlx4_free_hwq_res(mdev->dev, &ring->sp_wqres, ring->buf_size); 175 kfree(ring->bounce_buf); 176 ring->bounce_buf = NULL; 177 kvfree(ring->tx_info); 178 ring->tx_info = NULL; 179 kfree(ring); 180 *pring = NULL; 181 } 182 183 int mlx4_en_activate_tx_ring(struct mlx4_en_priv *priv, 184 struct mlx4_en_tx_ring *ring, 185 int cq, int user_prio) 186 { 187 struct mlx4_en_dev *mdev = priv->mdev; 188 int err; 189 190 ring->sp_cqn = cq; 191 ring->prod = 0; 192 ring->cons = 0xffffffff; 193 ring->last_nr_txbb = 1; 194 memset(ring->tx_info, 0, ring->size * sizeof(struct mlx4_en_tx_info)); 195 memset(ring->buf, 0, ring->buf_size); 196 ring->free_tx_desc = mlx4_en_free_tx_desc; 197 198 ring->sp_qp_state = MLX4_QP_STATE_RST; 199 ring->doorbell_qpn = cpu_to_be32(ring->sp_qp.qpn << 8); 200 ring->mr_key = cpu_to_be32(mdev->mr.key); 201 202 mlx4_en_fill_qp_context(priv, ring->size, ring->sp_stride, 1, 0, ring->qpn, 203 ring->sp_cqn, user_prio, &ring->sp_context); 204 if (ring->bf_alloced) 205 ring->sp_context.usr_page = 206 cpu_to_be32(mlx4_to_hw_uar_index(mdev->dev, 207 ring->bf.uar->index)); 208 209 err = mlx4_qp_to_ready(mdev->dev, &ring->sp_wqres.mtt, &ring->sp_context, 210 &ring->sp_qp, &ring->sp_qp_state); 211 if (!cpumask_empty(&ring->sp_affinity_mask)) 212 netif_set_xps_queue(priv->dev, &ring->sp_affinity_mask, 213 ring->queue_index); 214 215 return err; 216 } 217 218 void mlx4_en_deactivate_tx_ring(struct mlx4_en_priv *priv, 219 struct mlx4_en_tx_ring *ring) 220 { 221 struct mlx4_en_dev *mdev = priv->mdev; 222 223 mlx4_qp_modify(mdev->dev, NULL, ring->sp_qp_state, 224 MLX4_QP_STATE_RST, NULL, 0, 0, &ring->sp_qp); 225 } 226 227 static inline bool mlx4_en_is_tx_ring_full(struct mlx4_en_tx_ring *ring) 228 { 229 return ring->prod - ring->cons > ring->full_size; 230 } 231 232 static void mlx4_en_stamp_wqe(struct mlx4_en_priv *priv, 233 struct mlx4_en_tx_ring *ring, int index, 234 u8 owner) 235 { 236 __be32 stamp = cpu_to_be32(STAMP_VAL | (!!owner << STAMP_SHIFT)); 237 struct mlx4_en_tx_desc *tx_desc = ring->buf + (index << LOG_TXBB_SIZE); 238 struct mlx4_en_tx_info *tx_info = &ring->tx_info[index]; 239 void *end = ring->buf + ring->buf_size; 240 __be32 *ptr = (__be32 *)tx_desc; 241 int i; 242 243 /* Optimize the common case when there are no wraparounds */ 244 if (likely((void *)tx_desc + 245 (tx_info->nr_txbb << LOG_TXBB_SIZE) <= end)) { 246 /* Stamp the freed descriptor */ 247 for (i = 0; i < tx_info->nr_txbb << LOG_TXBB_SIZE; 248 i += STAMP_STRIDE) { 249 *ptr = stamp; 250 ptr += STAMP_DWORDS; 251 } 252 } else { 253 /* Stamp the freed descriptor */ 254 for (i = 0; i < tx_info->nr_txbb << LOG_TXBB_SIZE; 255 i += STAMP_STRIDE) { 256 *ptr = stamp; 257 ptr += STAMP_DWORDS; 258 if ((void *)ptr >= end) { 259 ptr = ring->buf; 260 stamp ^= cpu_to_be32(0x80000000); 261 } 262 } 263 } 264 } 265 266 INDIRECT_CALLABLE_DECLARE(u32 mlx4_en_free_tx_desc(struct mlx4_en_priv *priv, 267 struct mlx4_en_tx_ring *ring, 268 int index, u64 timestamp, 269 int napi_mode)); 270 271 u32 mlx4_en_free_tx_desc(struct mlx4_en_priv *priv, 272 struct mlx4_en_tx_ring *ring, 273 int index, u64 timestamp, 274 int napi_mode) 275 { 276 struct mlx4_en_tx_info *tx_info = &ring->tx_info[index]; 277 struct mlx4_en_tx_desc *tx_desc = ring->buf + (index << LOG_TXBB_SIZE); 278 struct mlx4_wqe_data_seg *data = (void *) tx_desc + tx_info->data_offset; 279 void *end = ring->buf + ring->buf_size; 280 struct sk_buff *skb = tx_info->skb; 281 int nr_maps = tx_info->nr_maps; 282 int i; 283 284 /* We do not touch skb here, so prefetch skb->users location 285 * to speedup consume_skb() 286 */ 287 prefetchw(&skb->users); 288 289 if (unlikely(timestamp)) { 290 struct skb_shared_hwtstamps hwts; 291 292 mlx4_en_fill_hwtstamps(priv->mdev, &hwts, timestamp); 293 skb_tstamp_tx(skb, &hwts); 294 } 295 296 if (!tx_info->inl) { 297 if (tx_info->linear) 298 dma_unmap_single(priv->ddev, 299 tx_info->map0_dma, 300 tx_info->map0_byte_count, 301 DMA_TO_DEVICE); 302 else 303 dma_unmap_page(priv->ddev, 304 tx_info->map0_dma, 305 tx_info->map0_byte_count, 306 DMA_TO_DEVICE); 307 /* Optimize the common case when there are no wraparounds */ 308 if (likely((void *)tx_desc + 309 (tx_info->nr_txbb << LOG_TXBB_SIZE) <= end)) { 310 for (i = 1; i < nr_maps; i++) { 311 data++; 312 dma_unmap_page(priv->ddev, 313 (dma_addr_t)be64_to_cpu(data->addr), 314 be32_to_cpu(data->byte_count), 315 DMA_TO_DEVICE); 316 } 317 } else { 318 if ((void *)data >= end) 319 data = ring->buf + ((void *)data - end); 320 321 for (i = 1; i < nr_maps; i++) { 322 data++; 323 /* Check for wraparound before unmapping */ 324 if ((void *) data >= end) 325 data = ring->buf; 326 dma_unmap_page(priv->ddev, 327 (dma_addr_t)be64_to_cpu(data->addr), 328 be32_to_cpu(data->byte_count), 329 DMA_TO_DEVICE); 330 } 331 } 332 } 333 napi_consume_skb(skb, napi_mode); 334 335 return tx_info->nr_txbb; 336 } 337 338 INDIRECT_CALLABLE_DECLARE(u32 mlx4_en_recycle_tx_desc(struct mlx4_en_priv *priv, 339 struct mlx4_en_tx_ring *ring, 340 int index, u64 timestamp, 341 int napi_mode)); 342 343 u32 mlx4_en_recycle_tx_desc(struct mlx4_en_priv *priv, 344 struct mlx4_en_tx_ring *ring, 345 int index, u64 timestamp, 346 int napi_mode) 347 { 348 struct mlx4_en_tx_info *tx_info = &ring->tx_info[index]; 349 struct mlx4_en_rx_alloc frame = { 350 .page = tx_info->page, 351 .dma = tx_info->map0_dma, 352 }; 353 354 if (!napi_mode || !mlx4_en_rx_recycle(ring->recycle_ring, &frame)) { 355 dma_unmap_page(priv->ddev, tx_info->map0_dma, 356 PAGE_SIZE, priv->dma_dir); 357 put_page(tx_info->page); 358 } 359 360 return tx_info->nr_txbb; 361 } 362 363 int mlx4_en_free_tx_buf(struct net_device *dev, struct mlx4_en_tx_ring *ring) 364 { 365 struct mlx4_en_priv *priv = netdev_priv(dev); 366 int cnt = 0; 367 368 /* Skip last polled descriptor */ 369 ring->cons += ring->last_nr_txbb; 370 en_dbg(DRV, priv, "Freeing Tx buf - cons:0x%x prod:0x%x\n", 371 ring->cons, ring->prod); 372 373 if ((u32) (ring->prod - ring->cons) > ring->size) { 374 if (netif_msg_tx_err(priv)) 375 en_warn(priv, "Tx consumer passed producer!\n"); 376 return 0; 377 } 378 379 while (ring->cons != ring->prod) { 380 ring->last_nr_txbb = ring->free_tx_desc(priv, ring, 381 ring->cons & ring->size_mask, 382 0, 0 /* Non-NAPI caller */); 383 ring->cons += ring->last_nr_txbb; 384 cnt++; 385 } 386 387 if (ring->tx_queue) 388 netdev_tx_reset_queue(ring->tx_queue); 389 390 if (cnt) 391 en_dbg(DRV, priv, "Freed %d uncompleted tx descriptors\n", cnt); 392 393 return cnt; 394 } 395 396 static void mlx4_en_handle_err_cqe(struct mlx4_en_priv *priv, struct mlx4_err_cqe *err_cqe, 397 u16 cqe_index, struct mlx4_en_tx_ring *ring) 398 { 399 struct mlx4_en_dev *mdev = priv->mdev; 400 struct mlx4_en_tx_info *tx_info; 401 struct mlx4_en_tx_desc *tx_desc; 402 u16 wqe_index; 403 int desc_size; 404 405 en_err(priv, "CQE error - cqn 0x%x, ci 0x%x, vendor syndrome: 0x%x syndrome: 0x%x\n", 406 ring->sp_cqn, cqe_index, err_cqe->vendor_err_syndrome, err_cqe->syndrome); 407 print_hex_dump(KERN_WARNING, "", DUMP_PREFIX_OFFSET, 16, 1, err_cqe, sizeof(*err_cqe), 408 false); 409 410 wqe_index = be16_to_cpu(err_cqe->wqe_index) & ring->size_mask; 411 tx_info = &ring->tx_info[wqe_index]; 412 desc_size = tx_info->nr_txbb << LOG_TXBB_SIZE; 413 en_err(priv, "Related WQE - qpn 0x%x, wqe index 0x%x, wqe size 0x%x\n", ring->qpn, 414 wqe_index, desc_size); 415 tx_desc = ring->buf + (wqe_index << LOG_TXBB_SIZE); 416 print_hex_dump(KERN_WARNING, "", DUMP_PREFIX_OFFSET, 16, 1, tx_desc, desc_size, false); 417 418 if (test_and_set_bit(MLX4_EN_STATE_FLAG_RESTARTING, &priv->state)) 419 return; 420 421 en_err(priv, "Scheduling port restart\n"); 422 queue_work(mdev->workqueue, &priv->restart_task); 423 } 424 425 int mlx4_en_process_tx_cq(struct net_device *dev, 426 struct mlx4_en_cq *cq, int napi_budget) 427 { 428 struct mlx4_en_priv *priv = netdev_priv(dev); 429 struct mlx4_cq *mcq = &cq->mcq; 430 struct mlx4_en_tx_ring *ring = priv->tx_ring[cq->type][cq->ring]; 431 struct mlx4_cqe *cqe; 432 u16 index, ring_index, stamp_index; 433 u32 txbbs_skipped = 0; 434 u32 txbbs_stamp = 0; 435 u32 cons_index = mcq->cons_index; 436 int size = cq->size; 437 u32 size_mask = ring->size_mask; 438 struct mlx4_cqe *buf = cq->buf; 439 u32 packets = 0; 440 u32 bytes = 0; 441 int factor = priv->cqe_factor; 442 int done = 0; 443 int budget = priv->tx_work_limit; 444 u32 last_nr_txbb; 445 u32 ring_cons; 446 447 if (unlikely(!priv->port_up)) 448 return 0; 449 450 netdev_txq_bql_complete_prefetchw(ring->tx_queue); 451 452 index = cons_index & size_mask; 453 cqe = mlx4_en_get_cqe(buf, index, priv->cqe_size) + factor; 454 last_nr_txbb = READ_ONCE(ring->last_nr_txbb); 455 ring_cons = READ_ONCE(ring->cons); 456 ring_index = ring_cons & size_mask; 457 stamp_index = ring_index; 458 459 /* Process all completed CQEs */ 460 while (XNOR(cqe->owner_sr_opcode & MLX4_CQE_OWNER_MASK, 461 cons_index & size) && (done < budget)) { 462 u16 new_index; 463 464 /* 465 * make sure we read the CQE after we read the 466 * ownership bit 467 */ 468 dma_rmb(); 469 470 if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) == 471 MLX4_CQE_OPCODE_ERROR)) 472 if (!test_and_set_bit(MLX4_EN_TX_RING_STATE_RECOVERING, &ring->state)) 473 mlx4_en_handle_err_cqe(priv, (struct mlx4_err_cqe *)cqe, index, 474 ring); 475 476 /* Skip over last polled CQE */ 477 new_index = be16_to_cpu(cqe->wqe_index) & size_mask; 478 479 do { 480 u64 timestamp = 0; 481 482 txbbs_skipped += last_nr_txbb; 483 ring_index = (ring_index + last_nr_txbb) & size_mask; 484 485 if (unlikely(ring->tx_info[ring_index].ts_requested)) 486 timestamp = mlx4_en_get_cqe_ts(cqe); 487 488 /* free next descriptor */ 489 last_nr_txbb = INDIRECT_CALL_2(ring->free_tx_desc, 490 mlx4_en_free_tx_desc, 491 mlx4_en_recycle_tx_desc, 492 priv, ring, ring_index, 493 timestamp, napi_budget); 494 495 mlx4_en_stamp_wqe(priv, ring, stamp_index, 496 !!((ring_cons + txbbs_stamp) & 497 ring->size)); 498 stamp_index = ring_index; 499 txbbs_stamp = txbbs_skipped; 500 packets++; 501 bytes += ring->tx_info[ring_index].nr_bytes; 502 } while ((++done < budget) && (ring_index != new_index)); 503 504 ++cons_index; 505 index = cons_index & size_mask; 506 cqe = mlx4_en_get_cqe(buf, index, priv->cqe_size) + factor; 507 } 508 509 /* 510 * To prevent CQ overflow we first update CQ consumer and only then 511 * the ring consumer. 512 */ 513 mcq->cons_index = cons_index; 514 mlx4_cq_set_ci(mcq); 515 wmb(); 516 517 /* we want to dirty this cache line once */ 518 WRITE_ONCE(ring->last_nr_txbb, last_nr_txbb); 519 WRITE_ONCE(ring->cons, ring_cons + txbbs_skipped); 520 521 if (cq->type == TX_XDP) 522 return done; 523 524 netdev_tx_completed_queue(ring->tx_queue, packets, bytes); 525 526 /* Wakeup Tx queue if this stopped, and ring is not full. 527 */ 528 if (netif_tx_queue_stopped(ring->tx_queue) && 529 !mlx4_en_is_tx_ring_full(ring)) { 530 netif_tx_wake_queue(ring->tx_queue); 531 ring->wake_queue++; 532 } 533 534 return done; 535 } 536 537 void mlx4_en_tx_irq(struct mlx4_cq *mcq) 538 { 539 struct mlx4_en_cq *cq = container_of(mcq, struct mlx4_en_cq, mcq); 540 struct mlx4_en_priv *priv = netdev_priv(cq->dev); 541 542 if (likely(priv->port_up)) 543 napi_schedule_irqoff(&cq->napi); 544 else 545 mlx4_en_arm_cq(priv, cq); 546 } 547 548 /* TX CQ polling - called by NAPI */ 549 int mlx4_en_poll_tx_cq(struct napi_struct *napi, int budget) 550 { 551 struct mlx4_en_cq *cq = container_of(napi, struct mlx4_en_cq, napi); 552 struct net_device *dev = cq->dev; 553 struct mlx4_en_priv *priv = netdev_priv(dev); 554 int work_done; 555 556 work_done = mlx4_en_process_tx_cq(dev, cq, budget); 557 if (work_done >= budget) 558 return budget; 559 560 if (napi_complete_done(napi, work_done)) 561 mlx4_en_arm_cq(priv, cq); 562 563 return 0; 564 } 565 566 static struct mlx4_en_tx_desc *mlx4_en_bounce_to_desc(struct mlx4_en_priv *priv, 567 struct mlx4_en_tx_ring *ring, 568 u32 index, 569 unsigned int desc_size) 570 { 571 u32 copy = (ring->size - index) << LOG_TXBB_SIZE; 572 int i; 573 574 for (i = desc_size - copy - 4; i >= 0; i -= 4) { 575 if ((i & (TXBB_SIZE - 1)) == 0) 576 wmb(); 577 578 *((u32 *) (ring->buf + i)) = 579 *((u32 *) (ring->bounce_buf + copy + i)); 580 } 581 582 for (i = copy - 4; i >= 4 ; i -= 4) { 583 if ((i & (TXBB_SIZE - 1)) == 0) 584 wmb(); 585 586 *((u32 *)(ring->buf + (index << LOG_TXBB_SIZE) + i)) = 587 *((u32 *) (ring->bounce_buf + i)); 588 } 589 590 /* Return real descriptor location */ 591 return ring->buf + (index << LOG_TXBB_SIZE); 592 } 593 594 /* Decide if skb can be inlined in tx descriptor to avoid dma mapping 595 * 596 * It seems strange we do not simply use skb_copy_bits(). 597 * This would allow to inline all skbs iff skb->len <= inline_thold 598 * 599 * Note that caller already checked skb was not a gso packet 600 */ 601 static bool is_inline(int inline_thold, const struct sk_buff *skb, 602 const struct skb_shared_info *shinfo, 603 void **pfrag) 604 { 605 void *ptr; 606 607 if (skb->len > inline_thold || !inline_thold) 608 return false; 609 610 if (shinfo->nr_frags == 1) { 611 ptr = skb_frag_address_safe(&shinfo->frags[0]); 612 if (unlikely(!ptr)) 613 return false; 614 *pfrag = ptr; 615 return true; 616 } 617 if (shinfo->nr_frags) 618 return false; 619 return true; 620 } 621 622 static int inline_size(const struct sk_buff *skb) 623 { 624 if (skb->len + CTRL_SIZE + sizeof(struct mlx4_wqe_inline_seg) 625 <= MLX4_INLINE_ALIGN) 626 return ALIGN(skb->len + CTRL_SIZE + 627 sizeof(struct mlx4_wqe_inline_seg), 16); 628 else 629 return ALIGN(skb->len + CTRL_SIZE + 2 * 630 sizeof(struct mlx4_wqe_inline_seg), 16); 631 } 632 633 static int get_real_size(const struct sk_buff *skb, 634 const struct skb_shared_info *shinfo, 635 struct net_device *dev, 636 int *lso_header_size, 637 bool *inline_ok, 638 void **pfrag, 639 int *hopbyhop) 640 { 641 struct mlx4_en_priv *priv = netdev_priv(dev); 642 int real_size; 643 644 if (shinfo->gso_size) { 645 *inline_ok = false; 646 *hopbyhop = 0; 647 if (skb->encapsulation) { 648 *lso_header_size = skb_inner_tcp_all_headers(skb); 649 } else { 650 /* Detects large IPV6 TCP packets and prepares for removal of 651 * HBH header that has been pushed by ip6_xmit(), 652 * mainly so that tcpdump can dissect them. 653 */ 654 if (ipv6_has_hopopt_jumbo(skb)) 655 *hopbyhop = sizeof(struct hop_jumbo_hdr); 656 *lso_header_size = skb_tcp_all_headers(skb); 657 } 658 real_size = CTRL_SIZE + shinfo->nr_frags * DS_SIZE + 659 ALIGN(*lso_header_size - *hopbyhop + 4, DS_SIZE); 660 if (unlikely(*lso_header_size != skb_headlen(skb))) { 661 /* We add a segment for the skb linear buffer only if 662 * it contains data */ 663 if (*lso_header_size < skb_headlen(skb)) 664 real_size += DS_SIZE; 665 else { 666 if (netif_msg_tx_err(priv)) 667 en_warn(priv, "Non-linear headers\n"); 668 return 0; 669 } 670 } 671 } else { 672 *lso_header_size = 0; 673 *inline_ok = is_inline(priv->prof->inline_thold, skb, 674 shinfo, pfrag); 675 676 if (*inline_ok) 677 real_size = inline_size(skb); 678 else 679 real_size = CTRL_SIZE + 680 (shinfo->nr_frags + 1) * DS_SIZE; 681 } 682 683 return real_size; 684 } 685 686 static void build_inline_wqe(struct mlx4_en_tx_desc *tx_desc, 687 const struct sk_buff *skb, 688 const struct skb_shared_info *shinfo, 689 void *fragptr) 690 { 691 struct mlx4_wqe_inline_seg *inl = &tx_desc->inl; 692 int spc = MLX4_INLINE_ALIGN - CTRL_SIZE - sizeof(*inl); 693 unsigned int hlen = skb_headlen(skb); 694 695 if (skb->len <= spc) { 696 if (likely(skb->len >= MIN_PKT_LEN)) { 697 inl->byte_count = cpu_to_be32(1 << 31 | skb->len); 698 } else { 699 inl->byte_count = cpu_to_be32(1 << 31 | MIN_PKT_LEN); 700 memset(((void *)(inl + 1)) + skb->len, 0, 701 MIN_PKT_LEN - skb->len); 702 } 703 skb_copy_from_linear_data(skb, inl + 1, hlen); 704 if (shinfo->nr_frags) 705 memcpy(((void *)(inl + 1)) + hlen, fragptr, 706 skb_frag_size(&shinfo->frags[0])); 707 708 } else { 709 inl->byte_count = cpu_to_be32(1 << 31 | spc); 710 if (hlen <= spc) { 711 skb_copy_from_linear_data(skb, inl + 1, hlen); 712 if (hlen < spc) { 713 memcpy(((void *)(inl + 1)) + hlen, 714 fragptr, spc - hlen); 715 fragptr += spc - hlen; 716 } 717 inl = (void *) (inl + 1) + spc; 718 memcpy(((void *)(inl + 1)), fragptr, skb->len - spc); 719 } else { 720 skb_copy_from_linear_data(skb, inl + 1, spc); 721 inl = (void *) (inl + 1) + spc; 722 skb_copy_from_linear_data_offset(skb, spc, inl + 1, 723 hlen - spc); 724 if (shinfo->nr_frags) 725 memcpy(((void *)(inl + 1)) + hlen - spc, 726 fragptr, 727 skb_frag_size(&shinfo->frags[0])); 728 } 729 730 dma_wmb(); 731 inl->byte_count = cpu_to_be32(1 << 31 | (skb->len - spc)); 732 } 733 } 734 735 u16 mlx4_en_select_queue(struct net_device *dev, struct sk_buff *skb, 736 struct net_device *sb_dev) 737 { 738 struct mlx4_en_priv *priv = netdev_priv(dev); 739 u16 rings_p_up = priv->num_tx_rings_p_up; 740 741 if (netdev_get_num_tc(dev)) 742 return netdev_pick_tx(dev, skb, NULL); 743 744 return netdev_pick_tx(dev, skb, NULL) % rings_p_up; 745 } 746 747 static void mlx4_bf_copy(void __iomem *dst, const void *src, 748 unsigned int bytecnt) 749 { 750 __iowrite64_copy(dst, src, bytecnt / 8); 751 } 752 753 void mlx4_en_xmit_doorbell(struct mlx4_en_tx_ring *ring) 754 { 755 wmb(); 756 /* Since there is no iowrite*_native() that writes the 757 * value as is, without byteswapping - using the one 758 * the doesn't do byteswapping in the relevant arch 759 * endianness. 760 */ 761 #if defined(__LITTLE_ENDIAN) 762 iowrite32( 763 #else 764 iowrite32be( 765 #endif 766 (__force u32)ring->doorbell_qpn, ring->doorbell_address); 767 } 768 769 static void mlx4_en_tx_write_desc(struct mlx4_en_tx_ring *ring, 770 struct mlx4_en_tx_desc *tx_desc, 771 union mlx4_wqe_qpn_vlan qpn_vlan, 772 int desc_size, int bf_index, 773 __be32 op_own, bool bf_ok, 774 bool send_doorbell) 775 { 776 tx_desc->ctrl.qpn_vlan = qpn_vlan; 777 778 if (bf_ok) { 779 op_own |= htonl((bf_index & 0xffff) << 8); 780 /* Ensure new descriptor hits memory 781 * before setting ownership of this descriptor to HW 782 */ 783 dma_wmb(); 784 tx_desc->ctrl.owner_opcode = op_own; 785 786 wmb(); 787 788 mlx4_bf_copy(ring->bf.reg + ring->bf.offset, &tx_desc->ctrl, 789 desc_size); 790 791 wmb(); 792 793 ring->bf.offset ^= ring->bf.buf_size; 794 } else { 795 /* Ensure new descriptor hits memory 796 * before setting ownership of this descriptor to HW 797 */ 798 dma_wmb(); 799 tx_desc->ctrl.owner_opcode = op_own; 800 if (send_doorbell) 801 mlx4_en_xmit_doorbell(ring); 802 else 803 ring->xmit_more++; 804 } 805 } 806 807 static bool mlx4_en_build_dma_wqe(struct mlx4_en_priv *priv, 808 struct skb_shared_info *shinfo, 809 struct mlx4_wqe_data_seg *data, 810 struct sk_buff *skb, 811 int lso_header_size, 812 __be32 mr_key, 813 struct mlx4_en_tx_info *tx_info) 814 { 815 struct device *ddev = priv->ddev; 816 dma_addr_t dma = 0; 817 u32 byte_count = 0; 818 int i_frag; 819 820 /* Map fragments if any */ 821 for (i_frag = shinfo->nr_frags - 1; i_frag >= 0; i_frag--) { 822 const skb_frag_t *frag = &shinfo->frags[i_frag]; 823 byte_count = skb_frag_size(frag); 824 dma = skb_frag_dma_map(ddev, frag, 825 0, byte_count, 826 DMA_TO_DEVICE); 827 if (dma_mapping_error(ddev, dma)) 828 goto tx_drop_unmap; 829 830 data->addr = cpu_to_be64(dma); 831 data->lkey = mr_key; 832 dma_wmb(); 833 data->byte_count = cpu_to_be32(byte_count); 834 --data; 835 } 836 837 /* Map linear part if needed */ 838 if (tx_info->linear) { 839 byte_count = skb_headlen(skb) - lso_header_size; 840 841 dma = dma_map_single(ddev, skb->data + 842 lso_header_size, byte_count, 843 DMA_TO_DEVICE); 844 if (dma_mapping_error(ddev, dma)) 845 goto tx_drop_unmap; 846 847 data->addr = cpu_to_be64(dma); 848 data->lkey = mr_key; 849 dma_wmb(); 850 data->byte_count = cpu_to_be32(byte_count); 851 } 852 /* tx completion can avoid cache line miss for common cases */ 853 tx_info->map0_dma = dma; 854 tx_info->map0_byte_count = byte_count; 855 856 return true; 857 858 tx_drop_unmap: 859 en_err(priv, "DMA mapping error\n"); 860 861 while (++i_frag < shinfo->nr_frags) { 862 ++data; 863 dma_unmap_page(ddev, (dma_addr_t)be64_to_cpu(data->addr), 864 be32_to_cpu(data->byte_count), 865 DMA_TO_DEVICE); 866 } 867 868 return false; 869 } 870 871 netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev) 872 { 873 struct skb_shared_info *shinfo = skb_shinfo(skb); 874 struct mlx4_en_priv *priv = netdev_priv(dev); 875 union mlx4_wqe_qpn_vlan qpn_vlan = {}; 876 struct mlx4_en_tx_ring *ring; 877 struct mlx4_en_tx_desc *tx_desc; 878 struct mlx4_wqe_data_seg *data; 879 struct mlx4_en_tx_info *tx_info; 880 u32 __maybe_unused ring_cons; 881 int tx_ind; 882 int nr_txbb; 883 int desc_size; 884 int real_size; 885 u32 index, bf_index; 886 struct ipv6hdr *h6; 887 __be32 op_own; 888 int lso_header_size; 889 void *fragptr = NULL; 890 bool bounce = false; 891 bool send_doorbell; 892 bool stop_queue; 893 bool inline_ok; 894 u8 data_offset; 895 int hopbyhop; 896 bool bf_ok; 897 898 tx_ind = skb_get_queue_mapping(skb); 899 ring = priv->tx_ring[TX][tx_ind]; 900 901 if (unlikely(!priv->port_up)) 902 goto tx_drop; 903 904 real_size = get_real_size(skb, shinfo, dev, &lso_header_size, 905 &inline_ok, &fragptr, &hopbyhop); 906 if (unlikely(!real_size)) 907 goto tx_drop_count; 908 909 /* Align descriptor to TXBB size */ 910 desc_size = ALIGN(real_size, TXBB_SIZE); 911 nr_txbb = desc_size >> LOG_TXBB_SIZE; 912 if (unlikely(nr_txbb > MAX_DESC_TXBBS)) { 913 if (netif_msg_tx_err(priv)) 914 en_warn(priv, "Oversized header or SG list\n"); 915 goto tx_drop_count; 916 } 917 918 bf_ok = ring->bf_enabled; 919 if (skb_vlan_tag_present(skb)) { 920 u16 vlan_proto; 921 922 qpn_vlan.vlan_tag = cpu_to_be16(skb_vlan_tag_get(skb)); 923 vlan_proto = be16_to_cpu(skb->vlan_proto); 924 if (vlan_proto == ETH_P_8021AD) 925 qpn_vlan.ins_vlan = MLX4_WQE_CTRL_INS_SVLAN; 926 else if (vlan_proto == ETH_P_8021Q) 927 qpn_vlan.ins_vlan = MLX4_WQE_CTRL_INS_CVLAN; 928 else 929 qpn_vlan.ins_vlan = 0; 930 bf_ok = false; 931 } 932 933 netdev_txq_bql_enqueue_prefetchw(ring->tx_queue); 934 935 /* Packet is good - grab an index and transmit it */ 936 index = ring->prod & ring->size_mask; 937 bf_index = ring->prod; 938 939 /* See if we have enough space for whole descriptor TXBB for setting 940 * SW ownership on next descriptor; if not, use a bounce buffer. */ 941 if (likely(index + nr_txbb <= ring->size)) 942 tx_desc = ring->buf + (index << LOG_TXBB_SIZE); 943 else { 944 tx_desc = (struct mlx4_en_tx_desc *) ring->bounce_buf; 945 bounce = true; 946 bf_ok = false; 947 } 948 949 /* Save skb in tx_info ring */ 950 tx_info = &ring->tx_info[index]; 951 tx_info->skb = skb; 952 tx_info->nr_txbb = nr_txbb; 953 954 if (!lso_header_size) { 955 data = &tx_desc->data; 956 data_offset = offsetof(struct mlx4_en_tx_desc, data); 957 } else { 958 int lso_align = ALIGN(lso_header_size - hopbyhop + 4, DS_SIZE); 959 960 data = (void *)&tx_desc->lso + lso_align; 961 data_offset = offsetof(struct mlx4_en_tx_desc, lso) + lso_align; 962 } 963 964 /* valid only for none inline segments */ 965 tx_info->data_offset = data_offset; 966 967 tx_info->inl = inline_ok; 968 969 tx_info->linear = lso_header_size < skb_headlen(skb) && !inline_ok; 970 971 tx_info->nr_maps = shinfo->nr_frags + tx_info->linear; 972 data += tx_info->nr_maps - 1; 973 974 if (!tx_info->inl) 975 if (!mlx4_en_build_dma_wqe(priv, shinfo, data, skb, 976 lso_header_size, ring->mr_key, 977 tx_info)) 978 goto tx_drop_count; 979 980 /* 981 * For timestamping add flag to skb_shinfo and 982 * set flag for further reference 983 */ 984 tx_info->ts_requested = 0; 985 if (unlikely(ring->hwtstamp_tx_type == HWTSTAMP_TX_ON && 986 shinfo->tx_flags & SKBTX_HW_TSTAMP)) { 987 shinfo->tx_flags |= SKBTX_IN_PROGRESS; 988 tx_info->ts_requested = 1; 989 } 990 991 /* Prepare ctrl segement apart opcode+ownership, which depends on 992 * whether LSO is used */ 993 tx_desc->ctrl.srcrb_flags = priv->ctrl_flags; 994 if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) { 995 if (!skb->encapsulation) 996 tx_desc->ctrl.srcrb_flags |= cpu_to_be32(MLX4_WQE_CTRL_IP_CSUM | 997 MLX4_WQE_CTRL_TCP_UDP_CSUM); 998 else 999 tx_desc->ctrl.srcrb_flags |= cpu_to_be32(MLX4_WQE_CTRL_IP_CSUM); 1000 ring->tx_csum++; 1001 } 1002 1003 if (priv->flags & MLX4_EN_FLAG_ENABLE_HW_LOOPBACK) { 1004 struct ethhdr *ethh; 1005 1006 /* Copy dst mac address to wqe. This allows loopback in eSwitch, 1007 * so that VFs and PF can communicate with each other 1008 */ 1009 ethh = (struct ethhdr *)skb->data; 1010 tx_desc->ctrl.srcrb_flags16[0] = get_unaligned((__be16 *)ethh->h_dest); 1011 tx_desc->ctrl.imm = get_unaligned((__be32 *)(ethh->h_dest + 2)); 1012 } 1013 1014 /* Handle LSO (TSO) packets */ 1015 if (lso_header_size) { 1016 int i; 1017 1018 /* Mark opcode as LSO */ 1019 op_own = cpu_to_be32(MLX4_OPCODE_LSO | (1 << 6)) | 1020 ((ring->prod & ring->size) ? 1021 cpu_to_be32(MLX4_EN_BIT_DESC_OWN) : 0); 1022 1023 lso_header_size -= hopbyhop; 1024 /* Fill in the LSO prefix */ 1025 tx_desc->lso.mss_hdr_size = cpu_to_be32( 1026 shinfo->gso_size << 16 | lso_header_size); 1027 1028 1029 if (unlikely(hopbyhop)) { 1030 /* remove the HBH header. 1031 * Layout: [Ethernet header][IPv6 header][HBH][TCP header] 1032 */ 1033 memcpy(tx_desc->lso.header, skb->data, ETH_HLEN + sizeof(*h6)); 1034 h6 = (struct ipv6hdr *)((char *)tx_desc->lso.header + ETH_HLEN); 1035 h6->nexthdr = IPPROTO_TCP; 1036 /* Copy the TCP header after the IPv6 one */ 1037 memcpy(h6 + 1, 1038 skb->data + ETH_HLEN + sizeof(*h6) + 1039 sizeof(struct hop_jumbo_hdr), 1040 tcp_hdrlen(skb)); 1041 /* Leave ipv6 payload_len set to 0, as LSO v2 specs request. */ 1042 } else { 1043 /* Copy headers; 1044 * note that we already verified that it is linear 1045 */ 1046 memcpy(tx_desc->lso.header, skb->data, lso_header_size); 1047 } 1048 ring->tso_packets++; 1049 1050 i = shinfo->gso_segs; 1051 tx_info->nr_bytes = skb->len + (i - 1) * lso_header_size; 1052 ring->packets += i; 1053 } else { 1054 /* Normal (Non LSO) packet */ 1055 op_own = cpu_to_be32(MLX4_OPCODE_SEND) | 1056 ((ring->prod & ring->size) ? 1057 cpu_to_be32(MLX4_EN_BIT_DESC_OWN) : 0); 1058 tx_info->nr_bytes = max_t(unsigned int, skb->len, ETH_ZLEN); 1059 ring->packets++; 1060 } 1061 ring->bytes += tx_info->nr_bytes; 1062 1063 if (tx_info->inl) 1064 build_inline_wqe(tx_desc, skb, shinfo, fragptr); 1065 1066 if (skb->encapsulation) { 1067 union { 1068 struct iphdr *v4; 1069 struct ipv6hdr *v6; 1070 unsigned char *hdr; 1071 } ip; 1072 u8 proto; 1073 1074 ip.hdr = skb_inner_network_header(skb); 1075 proto = (ip.v4->version == 4) ? ip.v4->protocol : 1076 ip.v6->nexthdr; 1077 1078 if (proto == IPPROTO_TCP || proto == IPPROTO_UDP) 1079 op_own |= cpu_to_be32(MLX4_WQE_CTRL_IIP | MLX4_WQE_CTRL_ILP); 1080 else 1081 op_own |= cpu_to_be32(MLX4_WQE_CTRL_IIP); 1082 } 1083 1084 ring->prod += nr_txbb; 1085 1086 /* If we used a bounce buffer then copy descriptor back into place */ 1087 if (unlikely(bounce)) 1088 tx_desc = mlx4_en_bounce_to_desc(priv, ring, index, desc_size); 1089 1090 skb_tx_timestamp(skb); 1091 1092 /* Check available TXBBs And 2K spare for prefetch */ 1093 stop_queue = mlx4_en_is_tx_ring_full(ring); 1094 if (unlikely(stop_queue)) { 1095 netif_tx_stop_queue(ring->tx_queue); 1096 ring->queue_stopped++; 1097 } 1098 1099 send_doorbell = __netdev_tx_sent_queue(ring->tx_queue, 1100 tx_info->nr_bytes, 1101 netdev_xmit_more()); 1102 1103 real_size = (real_size / 16) & 0x3f; 1104 1105 bf_ok &= desc_size <= MAX_BF && send_doorbell; 1106 1107 if (bf_ok) 1108 qpn_vlan.bf_qpn = ring->doorbell_qpn | cpu_to_be32(real_size); 1109 else 1110 qpn_vlan.fence_size = real_size; 1111 1112 mlx4_en_tx_write_desc(ring, tx_desc, qpn_vlan, desc_size, bf_index, 1113 op_own, bf_ok, send_doorbell); 1114 1115 if (unlikely(stop_queue)) { 1116 /* If queue was emptied after the if (stop_queue) , and before 1117 * the netif_tx_stop_queue() - need to wake the queue, 1118 * or else it will remain stopped forever. 1119 * Need a memory barrier to make sure ring->cons was not 1120 * updated before queue was stopped. 1121 */ 1122 smp_rmb(); 1123 1124 if (unlikely(!mlx4_en_is_tx_ring_full(ring))) { 1125 netif_tx_wake_queue(ring->tx_queue); 1126 ring->wake_queue++; 1127 } 1128 } 1129 return NETDEV_TX_OK; 1130 1131 tx_drop_count: 1132 ring->tx_dropped++; 1133 tx_drop: 1134 dev_kfree_skb_any(skb); 1135 return NETDEV_TX_OK; 1136 } 1137 1138 #define MLX4_EN_XDP_TX_NRTXBB 1 1139 #define MLX4_EN_XDP_TX_REAL_SZ (((CTRL_SIZE + MLX4_EN_XDP_TX_NRTXBB * DS_SIZE) \ 1140 / 16) & 0x3f) 1141 1142 void mlx4_en_init_tx_xdp_ring_descs(struct mlx4_en_priv *priv, 1143 struct mlx4_en_tx_ring *ring) 1144 { 1145 int i; 1146 1147 for (i = 0; i < ring->size; i++) { 1148 struct mlx4_en_tx_info *tx_info = &ring->tx_info[i]; 1149 struct mlx4_en_tx_desc *tx_desc = ring->buf + 1150 (i << LOG_TXBB_SIZE); 1151 1152 tx_info->map0_byte_count = PAGE_SIZE; 1153 tx_info->nr_txbb = MLX4_EN_XDP_TX_NRTXBB; 1154 tx_info->data_offset = offsetof(struct mlx4_en_tx_desc, data); 1155 tx_info->ts_requested = 0; 1156 tx_info->nr_maps = 1; 1157 tx_info->linear = 1; 1158 tx_info->inl = 0; 1159 1160 tx_desc->data.lkey = ring->mr_key; 1161 tx_desc->ctrl.qpn_vlan.fence_size = MLX4_EN_XDP_TX_REAL_SZ; 1162 tx_desc->ctrl.srcrb_flags = priv->ctrl_flags; 1163 } 1164 } 1165 1166 netdev_tx_t mlx4_en_xmit_frame(struct mlx4_en_rx_ring *rx_ring, 1167 struct mlx4_en_rx_alloc *frame, 1168 struct mlx4_en_priv *priv, unsigned int length, 1169 int tx_ind, bool *doorbell_pending) 1170 { 1171 struct mlx4_en_tx_desc *tx_desc; 1172 struct mlx4_en_tx_info *tx_info; 1173 struct mlx4_wqe_data_seg *data; 1174 struct mlx4_en_tx_ring *ring; 1175 dma_addr_t dma; 1176 __be32 op_own; 1177 int index; 1178 1179 if (unlikely(!priv->port_up)) 1180 goto tx_drop; 1181 1182 ring = priv->tx_ring[TX_XDP][tx_ind]; 1183 1184 if (unlikely(mlx4_en_is_tx_ring_full(ring))) 1185 goto tx_drop_count; 1186 1187 index = ring->prod & ring->size_mask; 1188 tx_info = &ring->tx_info[index]; 1189 1190 tx_desc = ring->buf + (index << LOG_TXBB_SIZE); 1191 data = &tx_desc->data; 1192 1193 dma = frame->dma; 1194 1195 tx_info->page = frame->page; 1196 frame->page = NULL; 1197 tx_info->map0_dma = dma; 1198 tx_info->nr_bytes = max_t(unsigned int, length, ETH_ZLEN); 1199 1200 dma_sync_single_range_for_device(priv->ddev, dma, frame->page_offset, 1201 length, DMA_TO_DEVICE); 1202 1203 data->addr = cpu_to_be64(dma + frame->page_offset); 1204 dma_wmb(); 1205 data->byte_count = cpu_to_be32(length); 1206 1207 /* tx completion can avoid cache line miss for common cases */ 1208 1209 op_own = cpu_to_be32(MLX4_OPCODE_SEND) | 1210 ((ring->prod & ring->size) ? 1211 cpu_to_be32(MLX4_EN_BIT_DESC_OWN) : 0); 1212 1213 rx_ring->xdp_tx++; 1214 1215 ring->prod += MLX4_EN_XDP_TX_NRTXBB; 1216 1217 /* Ensure new descriptor hits memory 1218 * before setting ownership of this descriptor to HW 1219 */ 1220 dma_wmb(); 1221 tx_desc->ctrl.owner_opcode = op_own; 1222 ring->xmit_more++; 1223 1224 *doorbell_pending = true; 1225 1226 return NETDEV_TX_OK; 1227 1228 tx_drop_count: 1229 rx_ring->xdp_tx_full++; 1230 *doorbell_pending = true; 1231 tx_drop: 1232 return NETDEV_TX_BUSY; 1233 } 1234