2 * Copyright (c) 2007 Mellanox Technologies. All rights reserved.
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:
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
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.
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
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>
44 #include <linux/ipv6.h>
45 #include <linux/moduleparam.h>
49 int mlx4_en_create_tx_ring(struct mlx4_en_priv *priv,
50 struct mlx4_en_tx_ring **pring, u32 size,
51 u16 stride, int node, int queue_index)
53 struct mlx4_en_dev *mdev = priv->mdev;
54 struct mlx4_en_tx_ring *ring;
58 ring = kzalloc_node(sizeof(*ring), GFP_KERNEL, node);
60 ring = kzalloc(sizeof(*ring), GFP_KERNEL);
62 en_err(priv, "Failed allocating TX ring\n");
68 ring->size_mask = size - 1;
69 ring->sp_stride = stride;
70 ring->full_size = ring->size - HEADROOM - MAX_DESC_TXBBS;
72 tmp = size * sizeof(struct mlx4_en_tx_info);
73 ring->tx_info = kvmalloc_node(tmp, GFP_KERNEL, node);
79 en_dbg(DRV, priv, "Allocated tx_info ring at addr:%p size:%d\n",
82 ring->bounce_buf = kmalloc_node(MAX_DESC_SIZE, GFP_KERNEL, node);
83 if (!ring->bounce_buf) {
84 ring->bounce_buf = kmalloc(MAX_DESC_SIZE, GFP_KERNEL);
85 if (!ring->bounce_buf) {
90 ring->buf_size = ALIGN(size * ring->sp_stride, MLX4_EN_PAGE_SIZE);
92 /* Allocate HW buffers on provided NUMA node */
93 set_dev_node(&mdev->dev->persist->pdev->dev, node);
94 err = mlx4_alloc_hwq_res(mdev->dev, &ring->sp_wqres, ring->buf_size);
95 set_dev_node(&mdev->dev->persist->pdev->dev, mdev->dev->numa_node);
97 en_err(priv, "Failed allocating hwq resources\n");
101 ring->buf = ring->sp_wqres.buf.direct.buf;
103 en_dbg(DRV, priv, "Allocated TX ring (addr:%p) - buf:%p size:%d buf_size:%d dma:%llx\n",
104 ring, ring->buf, ring->size, ring->buf_size,
105 (unsigned long long) ring->sp_wqres.buf.direct.map);
107 err = mlx4_qp_reserve_range(mdev->dev, 1, 1, &ring->qpn,
108 MLX4_RESERVE_ETH_BF_QP,
109 MLX4_RES_USAGE_DRIVER);
111 en_err(priv, "failed reserving qp for TX ring\n");
115 err = mlx4_qp_alloc(mdev->dev, ring->qpn, &ring->sp_qp);
117 en_err(priv, "Failed allocating qp %d\n", ring->qpn);
120 ring->sp_qp.event = mlx4_en_sqp_event;
122 err = mlx4_bf_alloc(mdev->dev, &ring->bf, node);
124 en_dbg(DRV, priv, "working without blueflame (%d)\n", err);
125 ring->bf.uar = &mdev->priv_uar;
126 ring->bf.uar->map = mdev->uar_map;
127 ring->bf_enabled = false;
128 ring->bf_alloced = false;
129 priv->pflags &= ~MLX4_EN_PRIV_FLAGS_BLUEFLAME;
131 ring->bf_alloced = true;
132 ring->bf_enabled = !!(priv->pflags &
133 MLX4_EN_PRIV_FLAGS_BLUEFLAME);
136 ring->hwtstamp_tx_type = priv->hwtstamp_config.tx_type;
137 ring->queue_index = queue_index;
139 if (queue_index < priv->num_tx_rings_p_up)
140 cpumask_set_cpu(cpumask_local_spread(queue_index,
141 priv->mdev->dev->numa_node),
142 &ring->sp_affinity_mask);
148 mlx4_qp_release_range(mdev->dev, ring->qpn, 1);
150 mlx4_free_hwq_res(mdev->dev, &ring->sp_wqres, ring->buf_size);
152 kfree(ring->bounce_buf);
153 ring->bounce_buf = NULL;
155 kvfree(ring->tx_info);
156 ring->tx_info = NULL;
163 void mlx4_en_destroy_tx_ring(struct mlx4_en_priv *priv,
164 struct mlx4_en_tx_ring **pring)
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);
170 if (ring->bf_alloced)
171 mlx4_bf_free(mdev->dev, &ring->bf);
172 mlx4_qp_remove(mdev->dev, &ring->sp_qp);
173 mlx4_qp_free(mdev->dev, &ring->sp_qp);
174 mlx4_qp_release_range(priv->mdev->dev, ring->qpn, 1);
175 mlx4_free_hwq_res(mdev->dev, &ring->sp_wqres, ring->buf_size);
176 kfree(ring->bounce_buf);
177 ring->bounce_buf = NULL;
178 kvfree(ring->tx_info);
179 ring->tx_info = NULL;
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)
188 struct mlx4_en_dev *mdev = priv->mdev;
193 ring->cons = 0xffffffff;
194 ring->last_nr_txbb = 1;
195 memset(ring->tx_info, 0, ring->size * sizeof(struct mlx4_en_tx_info));
196 memset(ring->buf, 0, ring->buf_size);
197 ring->free_tx_desc = mlx4_en_free_tx_desc;
199 ring->sp_qp_state = MLX4_QP_STATE_RST;
200 ring->doorbell_qpn = cpu_to_be32(ring->sp_qp.qpn << 8);
201 ring->mr_key = cpu_to_be32(mdev->mr.key);
203 mlx4_en_fill_qp_context(priv, ring->size, ring->sp_stride, 1, 0, ring->qpn,
204 ring->sp_cqn, user_prio, &ring->sp_context);
205 if (ring->bf_alloced)
206 ring->sp_context.usr_page =
207 cpu_to_be32(mlx4_to_hw_uar_index(mdev->dev,
208 ring->bf.uar->index));
210 err = mlx4_qp_to_ready(mdev->dev, &ring->sp_wqres.mtt, &ring->sp_context,
211 &ring->sp_qp, &ring->sp_qp_state);
212 if (!cpumask_empty(&ring->sp_affinity_mask))
213 netif_set_xps_queue(priv->dev, &ring->sp_affinity_mask,
219 void mlx4_en_deactivate_tx_ring(struct mlx4_en_priv *priv,
220 struct mlx4_en_tx_ring *ring)
222 struct mlx4_en_dev *mdev = priv->mdev;
224 mlx4_qp_modify(mdev->dev, NULL, ring->sp_qp_state,
225 MLX4_QP_STATE_RST, NULL, 0, 0, &ring->sp_qp);
228 static inline bool mlx4_en_is_tx_ring_full(struct mlx4_en_tx_ring *ring)
230 return ring->prod - ring->cons > ring->full_size;
233 static void mlx4_en_stamp_wqe(struct mlx4_en_priv *priv,
234 struct mlx4_en_tx_ring *ring, int index,
237 __be32 stamp = cpu_to_be32(STAMP_VAL | (!!owner << STAMP_SHIFT));
238 struct mlx4_en_tx_desc *tx_desc = ring->buf + (index << LOG_TXBB_SIZE);
239 struct mlx4_en_tx_info *tx_info = &ring->tx_info[index];
240 void *end = ring->buf + ring->buf_size;
241 __be32 *ptr = (__be32 *)tx_desc;
244 /* Optimize the common case when there are no wraparounds */
245 if (likely((void *)tx_desc +
246 (tx_info->nr_txbb << LOG_TXBB_SIZE) <= end)) {
247 /* Stamp the freed descriptor */
248 for (i = 0; i < tx_info->nr_txbb << LOG_TXBB_SIZE;
254 /* Stamp the freed descriptor */
255 for (i = 0; i < tx_info->nr_txbb << LOG_TXBB_SIZE;
259 if ((void *)ptr >= end) {
261 stamp ^= cpu_to_be32(0x80000000);
268 u32 mlx4_en_free_tx_desc(struct mlx4_en_priv *priv,
269 struct mlx4_en_tx_ring *ring,
270 int index, u64 timestamp,
273 struct mlx4_en_tx_info *tx_info = &ring->tx_info[index];
274 struct mlx4_en_tx_desc *tx_desc = ring->buf + (index << LOG_TXBB_SIZE);
275 struct mlx4_wqe_data_seg *data = (void *) tx_desc + tx_info->data_offset;
276 void *end = ring->buf + ring->buf_size;
277 struct sk_buff *skb = tx_info->skb;
278 int nr_maps = tx_info->nr_maps;
281 /* We do not touch skb here, so prefetch skb->users location
282 * to speedup consume_skb()
284 prefetchw(&skb->users);
286 if (unlikely(timestamp)) {
287 struct skb_shared_hwtstamps hwts;
289 mlx4_en_fill_hwtstamps(priv->mdev, &hwts, timestamp);
290 skb_tstamp_tx(skb, &hwts);
295 dma_unmap_single(priv->ddev,
297 tx_info->map0_byte_count,
300 dma_unmap_page(priv->ddev,
302 tx_info->map0_byte_count,
304 /* Optimize the common case when there are no wraparounds */
305 if (likely((void *)tx_desc +
306 (tx_info->nr_txbb << LOG_TXBB_SIZE) <= end)) {
307 for (i = 1; i < nr_maps; i++) {
309 dma_unmap_page(priv->ddev,
310 (dma_addr_t)be64_to_cpu(data->addr),
311 be32_to_cpu(data->byte_count),
315 if ((void *)data >= end)
316 data = ring->buf + ((void *)data - end);
318 for (i = 1; i < nr_maps; i++) {
320 /* Check for wraparound before unmapping */
321 if ((void *) data >= end)
323 dma_unmap_page(priv->ddev,
324 (dma_addr_t)be64_to_cpu(data->addr),
325 be32_to_cpu(data->byte_count),
330 napi_consume_skb(skb, napi_mode);
332 return tx_info->nr_txbb;
335 u32 mlx4_en_recycle_tx_desc(struct mlx4_en_priv *priv,
336 struct mlx4_en_tx_ring *ring,
337 int index, u64 timestamp,
340 struct mlx4_en_tx_info *tx_info = &ring->tx_info[index];
341 struct mlx4_en_rx_alloc frame = {
342 .page = tx_info->page,
343 .dma = tx_info->map0_dma,
346 if (!mlx4_en_rx_recycle(ring->recycle_ring, &frame)) {
347 dma_unmap_page(priv->ddev, tx_info->map0_dma,
348 PAGE_SIZE, priv->dma_dir);
349 put_page(tx_info->page);
352 return tx_info->nr_txbb;
355 int mlx4_en_free_tx_buf(struct net_device *dev, struct mlx4_en_tx_ring *ring)
357 struct mlx4_en_priv *priv = netdev_priv(dev);
360 /* Skip last polled descriptor */
361 ring->cons += ring->last_nr_txbb;
362 en_dbg(DRV, priv, "Freeing Tx buf - cons:0x%x prod:0x%x\n",
363 ring->cons, ring->prod);
365 if ((u32) (ring->prod - ring->cons) > ring->size) {
366 if (netif_msg_tx_err(priv))
367 en_warn(priv, "Tx consumer passed producer!\n");
371 while (ring->cons != ring->prod) {
372 ring->last_nr_txbb = ring->free_tx_desc(priv, ring,
373 ring->cons & ring->size_mask,
374 0, 0 /* Non-NAPI caller */);
375 ring->cons += ring->last_nr_txbb;
380 netdev_tx_reset_queue(ring->tx_queue);
383 en_dbg(DRV, priv, "Freed %d uncompleted tx descriptors\n", cnt);
388 bool mlx4_en_process_tx_cq(struct net_device *dev,
389 struct mlx4_en_cq *cq, int napi_budget)
391 struct mlx4_en_priv *priv = netdev_priv(dev);
392 struct mlx4_cq *mcq = &cq->mcq;
393 struct mlx4_en_tx_ring *ring = priv->tx_ring[cq->type][cq->ring];
394 struct mlx4_cqe *cqe;
395 u16 index, ring_index, stamp_index;
396 u32 txbbs_skipped = 0;
398 u32 cons_index = mcq->cons_index;
400 u32 size_mask = ring->size_mask;
401 struct mlx4_cqe *buf = cq->buf;
404 int factor = priv->cqe_factor;
406 int budget = priv->tx_work_limit;
410 if (unlikely(!priv->port_up))
413 netdev_txq_bql_complete_prefetchw(ring->tx_queue);
415 index = cons_index & size_mask;
416 cqe = mlx4_en_get_cqe(buf, index, priv->cqe_size) + factor;
417 last_nr_txbb = READ_ONCE(ring->last_nr_txbb);
418 ring_cons = READ_ONCE(ring->cons);
419 ring_index = ring_cons & size_mask;
420 stamp_index = ring_index;
422 /* Process all completed CQEs */
423 while (XNOR(cqe->owner_sr_opcode & MLX4_CQE_OWNER_MASK,
424 cons_index & size) && (done < budget)) {
428 * make sure we read the CQE after we read the
433 if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) ==
434 MLX4_CQE_OPCODE_ERROR)) {
435 struct mlx4_err_cqe *cqe_err = (struct mlx4_err_cqe *)cqe;
437 en_err(priv, "CQE error - vendor syndrome: 0x%x syndrome: 0x%x\n",
438 cqe_err->vendor_err_syndrome,
442 /* Skip over last polled CQE */
443 new_index = be16_to_cpu(cqe->wqe_index) & size_mask;
448 txbbs_skipped += last_nr_txbb;
449 ring_index = (ring_index + last_nr_txbb) & size_mask;
451 if (unlikely(ring->tx_info[ring_index].ts_requested))
452 timestamp = mlx4_en_get_cqe_ts(cqe);
454 /* free next descriptor */
455 last_nr_txbb = ring->free_tx_desc(
456 priv, ring, ring_index,
457 timestamp, napi_budget);
459 mlx4_en_stamp_wqe(priv, ring, stamp_index,
460 !!((ring_cons + txbbs_stamp) &
462 stamp_index = ring_index;
463 txbbs_stamp = txbbs_skipped;
465 bytes += ring->tx_info[ring_index].nr_bytes;
466 } while ((++done < budget) && (ring_index != new_index));
469 index = cons_index & size_mask;
470 cqe = mlx4_en_get_cqe(buf, index, priv->cqe_size) + factor;
474 * To prevent CQ overflow we first update CQ consumer and only then
477 mcq->cons_index = cons_index;
481 /* we want to dirty this cache line once */
482 WRITE_ONCE(ring->last_nr_txbb, last_nr_txbb);
483 WRITE_ONCE(ring->cons, ring_cons + txbbs_skipped);
485 if (cq->type == TX_XDP)
486 return done < budget;
488 netdev_tx_completed_queue(ring->tx_queue, packets, bytes);
490 /* Wakeup Tx queue if this stopped, and ring is not full.
492 if (netif_tx_queue_stopped(ring->tx_queue) &&
493 !mlx4_en_is_tx_ring_full(ring)) {
494 netif_tx_wake_queue(ring->tx_queue);
498 return done < budget;
501 void mlx4_en_tx_irq(struct mlx4_cq *mcq)
503 struct mlx4_en_cq *cq = container_of(mcq, struct mlx4_en_cq, mcq);
504 struct mlx4_en_priv *priv = netdev_priv(cq->dev);
506 if (likely(priv->port_up))
507 napi_schedule_irqoff(&cq->napi);
509 mlx4_en_arm_cq(priv, cq);
512 /* TX CQ polling - called by NAPI */
513 int mlx4_en_poll_tx_cq(struct napi_struct *napi, int budget)
515 struct mlx4_en_cq *cq = container_of(napi, struct mlx4_en_cq, napi);
516 struct net_device *dev = cq->dev;
517 struct mlx4_en_priv *priv = netdev_priv(dev);
520 clean_complete = mlx4_en_process_tx_cq(dev, cq, budget);
525 mlx4_en_arm_cq(priv, cq);
530 static struct mlx4_en_tx_desc *mlx4_en_bounce_to_desc(struct mlx4_en_priv *priv,
531 struct mlx4_en_tx_ring *ring,
533 unsigned int desc_size)
535 u32 copy = (ring->size - index) << LOG_TXBB_SIZE;
538 for (i = desc_size - copy - 4; i >= 0; i -= 4) {
539 if ((i & (TXBB_SIZE - 1)) == 0)
542 *((u32 *) (ring->buf + i)) =
543 *((u32 *) (ring->bounce_buf + copy + i));
546 for (i = copy - 4; i >= 4 ; i -= 4) {
547 if ((i & (TXBB_SIZE - 1)) == 0)
550 *((u32 *)(ring->buf + (index << LOG_TXBB_SIZE) + i)) =
551 *((u32 *) (ring->bounce_buf + i));
554 /* Return real descriptor location */
555 return ring->buf + (index << LOG_TXBB_SIZE);
558 /* Decide if skb can be inlined in tx descriptor to avoid dma mapping
560 * It seems strange we do not simply use skb_copy_bits().
561 * This would allow to inline all skbs iff skb->len <= inline_thold
563 * Note that caller already checked skb was not a gso packet
565 static bool is_inline(int inline_thold, const struct sk_buff *skb,
566 const struct skb_shared_info *shinfo,
571 if (skb->len > inline_thold || !inline_thold)
574 if (shinfo->nr_frags == 1) {
575 ptr = skb_frag_address_safe(&shinfo->frags[0]);
581 if (shinfo->nr_frags)
586 static int inline_size(const struct sk_buff *skb)
588 if (skb->len + CTRL_SIZE + sizeof(struct mlx4_wqe_inline_seg)
589 <= MLX4_INLINE_ALIGN)
590 return ALIGN(skb->len + CTRL_SIZE +
591 sizeof(struct mlx4_wqe_inline_seg), 16);
593 return ALIGN(skb->len + CTRL_SIZE + 2 *
594 sizeof(struct mlx4_wqe_inline_seg), 16);
597 static int get_real_size(const struct sk_buff *skb,
598 const struct skb_shared_info *shinfo,
599 struct net_device *dev,
600 int *lso_header_size,
604 struct mlx4_en_priv *priv = netdev_priv(dev);
607 if (shinfo->gso_size) {
609 if (skb->encapsulation)
610 *lso_header_size = (skb_inner_transport_header(skb) - skb->data) + inner_tcp_hdrlen(skb);
612 *lso_header_size = skb_transport_offset(skb) + tcp_hdrlen(skb);
613 real_size = CTRL_SIZE + shinfo->nr_frags * DS_SIZE +
614 ALIGN(*lso_header_size + 4, DS_SIZE);
615 if (unlikely(*lso_header_size != skb_headlen(skb))) {
616 /* We add a segment for the skb linear buffer only if
617 * it contains data */
618 if (*lso_header_size < skb_headlen(skb))
619 real_size += DS_SIZE;
621 if (netif_msg_tx_err(priv))
622 en_warn(priv, "Non-linear headers\n");
627 *lso_header_size = 0;
628 *inline_ok = is_inline(priv->prof->inline_thold, skb,
632 real_size = inline_size(skb);
634 real_size = CTRL_SIZE +
635 (shinfo->nr_frags + 1) * DS_SIZE;
641 static void build_inline_wqe(struct mlx4_en_tx_desc *tx_desc,
642 const struct sk_buff *skb,
643 const struct skb_shared_info *shinfo,
646 struct mlx4_wqe_inline_seg *inl = &tx_desc->inl;
647 int spc = MLX4_INLINE_ALIGN - CTRL_SIZE - sizeof(*inl);
648 unsigned int hlen = skb_headlen(skb);
650 if (skb->len <= spc) {
651 if (likely(skb->len >= MIN_PKT_LEN)) {
652 inl->byte_count = cpu_to_be32(1 << 31 | skb->len);
654 inl->byte_count = cpu_to_be32(1 << 31 | MIN_PKT_LEN);
655 memset(((void *)(inl + 1)) + skb->len, 0,
656 MIN_PKT_LEN - skb->len);
658 skb_copy_from_linear_data(skb, inl + 1, hlen);
659 if (shinfo->nr_frags)
660 memcpy(((void *)(inl + 1)) + hlen, fragptr,
661 skb_frag_size(&shinfo->frags[0]));
664 inl->byte_count = cpu_to_be32(1 << 31 | spc);
666 skb_copy_from_linear_data(skb, inl + 1, hlen);
668 memcpy(((void *)(inl + 1)) + hlen,
669 fragptr, spc - hlen);
670 fragptr += spc - hlen;
672 inl = (void *) (inl + 1) + spc;
673 memcpy(((void *)(inl + 1)), fragptr, skb->len - spc);
675 skb_copy_from_linear_data(skb, inl + 1, spc);
676 inl = (void *) (inl + 1) + spc;
677 skb_copy_from_linear_data_offset(skb, spc, inl + 1,
679 if (shinfo->nr_frags)
680 memcpy(((void *)(inl + 1)) + hlen - spc,
682 skb_frag_size(&shinfo->frags[0]));
686 inl->byte_count = cpu_to_be32(1 << 31 | (skb->len - spc));
690 u16 mlx4_en_select_queue(struct net_device *dev, struct sk_buff *skb,
691 struct net_device *sb_dev,
692 select_queue_fallback_t fallback)
694 struct mlx4_en_priv *priv = netdev_priv(dev);
695 u16 rings_p_up = priv->num_tx_rings_p_up;
697 if (netdev_get_num_tc(dev))
698 return fallback(dev, skb, NULL);
700 return fallback(dev, skb, NULL) % rings_p_up;
703 static void mlx4_bf_copy(void __iomem *dst, const void *src,
704 unsigned int bytecnt)
706 __iowrite64_copy(dst, src, bytecnt / 8);
709 void mlx4_en_xmit_doorbell(struct mlx4_en_tx_ring *ring)
712 /* Since there is no iowrite*_native() that writes the
713 * value as is, without byteswapping - using the one
714 * the doesn't do byteswapping in the relevant arch
717 #if defined(__LITTLE_ENDIAN)
722 (__force u32)ring->doorbell_qpn,
723 ring->bf.uar->map + MLX4_SEND_DOORBELL);
726 static void mlx4_en_tx_write_desc(struct mlx4_en_tx_ring *ring,
727 struct mlx4_en_tx_desc *tx_desc,
728 union mlx4_wqe_qpn_vlan qpn_vlan,
729 int desc_size, int bf_index,
730 __be32 op_own, bool bf_ok,
733 tx_desc->ctrl.qpn_vlan = qpn_vlan;
736 op_own |= htonl((bf_index & 0xffff) << 8);
737 /* Ensure new descriptor hits memory
738 * before setting ownership of this descriptor to HW
741 tx_desc->ctrl.owner_opcode = op_own;
745 mlx4_bf_copy(ring->bf.reg + ring->bf.offset, &tx_desc->ctrl,
750 ring->bf.offset ^= ring->bf.buf_size;
752 /* Ensure new descriptor hits memory
753 * before setting ownership of this descriptor to HW
756 tx_desc->ctrl.owner_opcode = op_own;
758 mlx4_en_xmit_doorbell(ring);
764 static bool mlx4_en_build_dma_wqe(struct mlx4_en_priv *priv,
765 struct skb_shared_info *shinfo,
766 struct mlx4_wqe_data_seg *data,
770 struct mlx4_en_tx_info *tx_info)
772 struct device *ddev = priv->ddev;
777 /* Map fragments if any */
778 for (i_frag = shinfo->nr_frags - 1; i_frag >= 0; i_frag--) {
779 const struct skb_frag_struct *frag;
781 frag = &shinfo->frags[i_frag];
782 byte_count = skb_frag_size(frag);
783 dma = skb_frag_dma_map(ddev, frag,
786 if (dma_mapping_error(ddev, dma))
789 data->addr = cpu_to_be64(dma);
792 data->byte_count = cpu_to_be32(byte_count);
796 /* Map linear part if needed */
797 if (tx_info->linear) {
798 byte_count = skb_headlen(skb) - lso_header_size;
800 dma = dma_map_single(ddev, skb->data +
801 lso_header_size, byte_count,
803 if (dma_mapping_error(ddev, dma))
806 data->addr = cpu_to_be64(dma);
809 data->byte_count = cpu_to_be32(byte_count);
811 /* tx completion can avoid cache line miss for common cases */
812 tx_info->map0_dma = dma;
813 tx_info->map0_byte_count = byte_count;
818 en_err(priv, "DMA mapping error\n");
820 while (++i_frag < shinfo->nr_frags) {
822 dma_unmap_page(ddev, (dma_addr_t)be64_to_cpu(data->addr),
823 be32_to_cpu(data->byte_count),
830 netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
832 struct skb_shared_info *shinfo = skb_shinfo(skb);
833 struct mlx4_en_priv *priv = netdev_priv(dev);
834 union mlx4_wqe_qpn_vlan qpn_vlan = {};
835 struct mlx4_en_tx_ring *ring;
836 struct mlx4_en_tx_desc *tx_desc;
837 struct mlx4_wqe_data_seg *data;
838 struct mlx4_en_tx_info *tx_info;
846 void *fragptr = NULL;
855 tx_ind = skb_get_queue_mapping(skb);
856 ring = priv->tx_ring[TX][tx_ind];
858 if (unlikely(!priv->port_up))
861 /* fetch ring->cons far ahead before needing it to avoid stall */
862 ring_cons = READ_ONCE(ring->cons);
864 real_size = get_real_size(skb, shinfo, dev, &lso_header_size,
865 &inline_ok, &fragptr);
866 if (unlikely(!real_size))
869 /* Align descriptor to TXBB size */
870 desc_size = ALIGN(real_size, TXBB_SIZE);
871 nr_txbb = desc_size >> LOG_TXBB_SIZE;
872 if (unlikely(nr_txbb > MAX_DESC_TXBBS)) {
873 if (netif_msg_tx_err(priv))
874 en_warn(priv, "Oversized header or SG list\n");
878 bf_ok = ring->bf_enabled;
879 if (skb_vlan_tag_present(skb)) {
882 qpn_vlan.vlan_tag = cpu_to_be16(skb_vlan_tag_get(skb));
883 vlan_proto = be16_to_cpu(skb->vlan_proto);
884 if (vlan_proto == ETH_P_8021AD)
885 qpn_vlan.ins_vlan = MLX4_WQE_CTRL_INS_SVLAN;
886 else if (vlan_proto == ETH_P_8021Q)
887 qpn_vlan.ins_vlan = MLX4_WQE_CTRL_INS_CVLAN;
889 qpn_vlan.ins_vlan = 0;
893 netdev_txq_bql_enqueue_prefetchw(ring->tx_queue);
895 /* Track current inflight packets for performance analysis */
896 AVG_PERF_COUNTER(priv->pstats.inflight_avg,
897 (u32)(ring->prod - ring_cons - 1));
899 /* Packet is good - grab an index and transmit it */
900 index = ring->prod & ring->size_mask;
901 bf_index = ring->prod;
903 /* See if we have enough space for whole descriptor TXBB for setting
904 * SW ownership on next descriptor; if not, use a bounce buffer. */
905 if (likely(index + nr_txbb <= ring->size))
906 tx_desc = ring->buf + (index << LOG_TXBB_SIZE);
908 tx_desc = (struct mlx4_en_tx_desc *) ring->bounce_buf;
913 /* Save skb in tx_info ring */
914 tx_info = &ring->tx_info[index];
916 tx_info->nr_txbb = nr_txbb;
918 if (!lso_header_size) {
919 data = &tx_desc->data;
920 data_offset = offsetof(struct mlx4_en_tx_desc, data);
922 int lso_align = ALIGN(lso_header_size + 4, DS_SIZE);
924 data = (void *)&tx_desc->lso + lso_align;
925 data_offset = offsetof(struct mlx4_en_tx_desc, lso) + lso_align;
928 /* valid only for none inline segments */
929 tx_info->data_offset = data_offset;
931 tx_info->inl = inline_ok;
933 tx_info->linear = lso_header_size < skb_headlen(skb) && !inline_ok;
935 tx_info->nr_maps = shinfo->nr_frags + tx_info->linear;
936 data += tx_info->nr_maps - 1;
939 if (!mlx4_en_build_dma_wqe(priv, shinfo, data, skb,
940 lso_header_size, ring->mr_key,
945 * For timestamping add flag to skb_shinfo and
946 * set flag for further reference
948 tx_info->ts_requested = 0;
949 if (unlikely(ring->hwtstamp_tx_type == HWTSTAMP_TX_ON &&
950 shinfo->tx_flags & SKBTX_HW_TSTAMP)) {
951 shinfo->tx_flags |= SKBTX_IN_PROGRESS;
952 tx_info->ts_requested = 1;
955 /* Prepare ctrl segement apart opcode+ownership, which depends on
956 * whether LSO is used */
957 tx_desc->ctrl.srcrb_flags = priv->ctrl_flags;
958 if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
959 if (!skb->encapsulation)
960 tx_desc->ctrl.srcrb_flags |= cpu_to_be32(MLX4_WQE_CTRL_IP_CSUM |
961 MLX4_WQE_CTRL_TCP_UDP_CSUM);
963 tx_desc->ctrl.srcrb_flags |= cpu_to_be32(MLX4_WQE_CTRL_IP_CSUM);
967 if (priv->flags & MLX4_EN_FLAG_ENABLE_HW_LOOPBACK) {
970 /* Copy dst mac address to wqe. This allows loopback in eSwitch,
971 * so that VFs and PF can communicate with each other
973 ethh = (struct ethhdr *)skb->data;
974 tx_desc->ctrl.srcrb_flags16[0] = get_unaligned((__be16 *)ethh->h_dest);
975 tx_desc->ctrl.imm = get_unaligned((__be32 *)(ethh->h_dest + 2));
978 /* Handle LSO (TSO) packets */
979 if (lso_header_size) {
982 /* Mark opcode as LSO */
983 op_own = cpu_to_be32(MLX4_OPCODE_LSO | (1 << 6)) |
984 ((ring->prod & ring->size) ?
985 cpu_to_be32(MLX4_EN_BIT_DESC_OWN) : 0);
987 /* Fill in the LSO prefix */
988 tx_desc->lso.mss_hdr_size = cpu_to_be32(
989 shinfo->gso_size << 16 | lso_header_size);
992 * note that we already verified that it is linear */
993 memcpy(tx_desc->lso.header, skb->data, lso_header_size);
997 i = shinfo->gso_segs;
998 tx_info->nr_bytes = skb->len + (i - 1) * lso_header_size;
1001 /* Normal (Non LSO) packet */
1002 op_own = cpu_to_be32(MLX4_OPCODE_SEND) |
1003 ((ring->prod & ring->size) ?
1004 cpu_to_be32(MLX4_EN_BIT_DESC_OWN) : 0);
1005 tx_info->nr_bytes = max_t(unsigned int, skb->len, ETH_ZLEN);
1008 ring->bytes += tx_info->nr_bytes;
1009 netdev_tx_sent_queue(ring->tx_queue, tx_info->nr_bytes);
1010 AVG_PERF_COUNTER(priv->pstats.tx_pktsz_avg, skb->len);
1013 build_inline_wqe(tx_desc, skb, shinfo, fragptr);
1015 if (skb->encapsulation) {
1023 ip.hdr = skb_inner_network_header(skb);
1024 proto = (ip.v4->version == 4) ? ip.v4->protocol :
1027 if (proto == IPPROTO_TCP || proto == IPPROTO_UDP)
1028 op_own |= cpu_to_be32(MLX4_WQE_CTRL_IIP | MLX4_WQE_CTRL_ILP);
1030 op_own |= cpu_to_be32(MLX4_WQE_CTRL_IIP);
1033 ring->prod += nr_txbb;
1035 /* If we used a bounce buffer then copy descriptor back into place */
1036 if (unlikely(bounce))
1037 tx_desc = mlx4_en_bounce_to_desc(priv, ring, index, desc_size);
1039 skb_tx_timestamp(skb);
1041 /* Check available TXBBs And 2K spare for prefetch */
1042 stop_queue = mlx4_en_is_tx_ring_full(ring);
1043 if (unlikely(stop_queue)) {
1044 netif_tx_stop_queue(ring->tx_queue);
1045 ring->queue_stopped++;
1047 send_doorbell = !skb->xmit_more || netif_xmit_stopped(ring->tx_queue);
1049 real_size = (real_size / 16) & 0x3f;
1051 bf_ok &= desc_size <= MAX_BF && send_doorbell;
1054 qpn_vlan.bf_qpn = ring->doorbell_qpn | cpu_to_be32(real_size);
1056 qpn_vlan.fence_size = real_size;
1058 mlx4_en_tx_write_desc(ring, tx_desc, qpn_vlan, desc_size, bf_index,
1059 op_own, bf_ok, send_doorbell);
1061 if (unlikely(stop_queue)) {
1062 /* If queue was emptied after the if (stop_queue) , and before
1063 * the netif_tx_stop_queue() - need to wake the queue,
1064 * or else it will remain stopped forever.
1065 * Need a memory barrier to make sure ring->cons was not
1066 * updated before queue was stopped.
1070 ring_cons = READ_ONCE(ring->cons);
1071 if (unlikely(!mlx4_en_is_tx_ring_full(ring))) {
1072 netif_tx_wake_queue(ring->tx_queue);
1076 return NETDEV_TX_OK;
1081 dev_kfree_skb_any(skb);
1082 return NETDEV_TX_OK;
1085 #define MLX4_EN_XDP_TX_NRTXBB 1
1086 #define MLX4_EN_XDP_TX_REAL_SZ (((CTRL_SIZE + MLX4_EN_XDP_TX_NRTXBB * DS_SIZE) \
1089 void mlx4_en_init_tx_xdp_ring_descs(struct mlx4_en_priv *priv,
1090 struct mlx4_en_tx_ring *ring)
1094 for (i = 0; i < ring->size; i++) {
1095 struct mlx4_en_tx_info *tx_info = &ring->tx_info[i];
1096 struct mlx4_en_tx_desc *tx_desc = ring->buf +
1097 (i << LOG_TXBB_SIZE);
1099 tx_info->map0_byte_count = PAGE_SIZE;
1100 tx_info->nr_txbb = MLX4_EN_XDP_TX_NRTXBB;
1101 tx_info->data_offset = offsetof(struct mlx4_en_tx_desc, data);
1102 tx_info->ts_requested = 0;
1103 tx_info->nr_maps = 1;
1104 tx_info->linear = 1;
1107 tx_desc->data.lkey = ring->mr_key;
1108 tx_desc->ctrl.qpn_vlan.fence_size = MLX4_EN_XDP_TX_REAL_SZ;
1109 tx_desc->ctrl.srcrb_flags = priv->ctrl_flags;
1113 netdev_tx_t mlx4_en_xmit_frame(struct mlx4_en_rx_ring *rx_ring,
1114 struct mlx4_en_rx_alloc *frame,
1115 struct mlx4_en_priv *priv, unsigned int length,
1116 int tx_ind, bool *doorbell_pending)
1118 struct mlx4_en_tx_desc *tx_desc;
1119 struct mlx4_en_tx_info *tx_info;
1120 struct mlx4_wqe_data_seg *data;
1121 struct mlx4_en_tx_ring *ring;
1126 if (unlikely(!priv->port_up))
1129 ring = priv->tx_ring[TX_XDP][tx_ind];
1131 if (unlikely(mlx4_en_is_tx_ring_full(ring)))
1134 index = ring->prod & ring->size_mask;
1135 tx_info = &ring->tx_info[index];
1137 /* Track current inflight packets for performance analysis */
1138 AVG_PERF_COUNTER(priv->pstats.inflight_avg,
1139 (u32)(ring->prod - READ_ONCE(ring->cons) - 1));
1141 tx_desc = ring->buf + (index << LOG_TXBB_SIZE);
1142 data = &tx_desc->data;
1146 tx_info->page = frame->page;
1148 tx_info->map0_dma = dma;
1149 tx_info->nr_bytes = max_t(unsigned int, length, ETH_ZLEN);
1151 dma_sync_single_range_for_device(priv->ddev, dma, frame->page_offset,
1152 length, PCI_DMA_TODEVICE);
1154 data->addr = cpu_to_be64(dma + frame->page_offset);
1156 data->byte_count = cpu_to_be32(length);
1158 /* tx completion can avoid cache line miss for common cases */
1160 op_own = cpu_to_be32(MLX4_OPCODE_SEND) |
1161 ((ring->prod & ring->size) ?
1162 cpu_to_be32(MLX4_EN_BIT_DESC_OWN) : 0);
1165 AVG_PERF_COUNTER(priv->pstats.tx_pktsz_avg, length);
1167 ring->prod += MLX4_EN_XDP_TX_NRTXBB;
1169 /* Ensure new descriptor hits memory
1170 * before setting ownership of this descriptor to HW
1173 tx_desc->ctrl.owner_opcode = op_own;
1176 *doorbell_pending = true;
1178 return NETDEV_TX_OK;
1181 rx_ring->xdp_tx_full++;
1182 *doorbell_pending = true;
1184 return NETDEV_TX_BUSY;