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
34 #include <net/busy_poll.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/rculist.h>
40 #include <linux/if_ether.h>
41 #include <linux/if_vlan.h>
42 #include <linux/vmalloc.h>
43 #include <linux/irq.h>
45 #if IS_ENABLED(CONFIG_IPV6)
46 #include <net/ip6_checksum.h>
51 static int mlx4_alloc_pages(struct mlx4_en_priv *priv,
52 struct mlx4_en_rx_alloc *page_alloc,
53 const struct mlx4_en_frag_info *frag_info,
60 for (order = MLX4_EN_ALLOC_PREFER_ORDER; ;) {
64 gfp |= __GFP_COMP | __GFP_NOWARN;
65 page = alloc_pages(gfp, order);
69 ((PAGE_SIZE << order) < frag_info->frag_size))
72 dma = dma_map_page(priv->ddev, page, 0, PAGE_SIZE << order,
74 if (dma_mapping_error(priv->ddev, dma)) {
78 page_alloc->page_size = PAGE_SIZE << order;
79 page_alloc->page = page;
80 page_alloc->dma = dma;
81 page_alloc->page_offset = 0;
82 /* Not doing get_page() for each frag is a big win
83 * on asymetric workloads. Note we can not use atomic_set().
85 atomic_add(page_alloc->page_size / frag_info->frag_stride - 1,
90 static int mlx4_en_alloc_frags(struct mlx4_en_priv *priv,
91 struct mlx4_en_rx_desc *rx_desc,
92 struct mlx4_en_rx_alloc *frags,
93 struct mlx4_en_rx_alloc *ring_alloc,
96 struct mlx4_en_rx_alloc page_alloc[MLX4_EN_MAX_RX_FRAGS];
97 const struct mlx4_en_frag_info *frag_info;
102 for (i = 0; i < priv->num_frags; i++) {
103 frag_info = &priv->frag_info[i];
104 page_alloc[i] = ring_alloc[i];
105 page_alloc[i].page_offset += frag_info->frag_stride;
107 if (page_alloc[i].page_offset + frag_info->frag_stride <=
108 ring_alloc[i].page_size)
111 if (mlx4_alloc_pages(priv, &page_alloc[i], frag_info, gfp))
115 for (i = 0; i < priv->num_frags; i++) {
116 frags[i] = ring_alloc[i];
117 dma = ring_alloc[i].dma + ring_alloc[i].page_offset;
118 ring_alloc[i] = page_alloc[i];
119 rx_desc->data[i].addr = cpu_to_be64(dma);
126 if (page_alloc[i].page != ring_alloc[i].page) {
127 dma_unmap_page(priv->ddev, page_alloc[i].dma,
128 page_alloc[i].page_size, PCI_DMA_FROMDEVICE);
129 page = page_alloc[i].page;
130 atomic_set(&page->_count, 1);
137 static void mlx4_en_free_frag(struct mlx4_en_priv *priv,
138 struct mlx4_en_rx_alloc *frags,
141 const struct mlx4_en_frag_info *frag_info = &priv->frag_info[i];
142 u32 next_frag_end = frags[i].page_offset + 2 * frag_info->frag_stride;
145 if (next_frag_end > frags[i].page_size)
146 dma_unmap_page(priv->ddev, frags[i].dma, frags[i].page_size,
150 put_page(frags[i].page);
153 static int mlx4_en_init_allocator(struct mlx4_en_priv *priv,
154 struct mlx4_en_rx_ring *ring)
157 struct mlx4_en_rx_alloc *page_alloc;
159 for (i = 0; i < priv->num_frags; i++) {
160 const struct mlx4_en_frag_info *frag_info = &priv->frag_info[i];
162 if (mlx4_alloc_pages(priv, &ring->page_alloc[i],
163 frag_info, GFP_KERNEL | __GFP_COLD))
166 en_dbg(DRV, priv, " frag %d allocator: - size:%d frags:%d\n",
167 i, ring->page_alloc[i].page_size,
168 atomic_read(&ring->page_alloc[i].page->_count));
176 page_alloc = &ring->page_alloc[i];
177 dma_unmap_page(priv->ddev, page_alloc->dma,
178 page_alloc->page_size, PCI_DMA_FROMDEVICE);
179 page = page_alloc->page;
180 atomic_set(&page->_count, 1);
182 page_alloc->page = NULL;
187 static void mlx4_en_destroy_allocator(struct mlx4_en_priv *priv,
188 struct mlx4_en_rx_ring *ring)
190 struct mlx4_en_rx_alloc *page_alloc;
193 for (i = 0; i < priv->num_frags; i++) {
194 const struct mlx4_en_frag_info *frag_info = &priv->frag_info[i];
196 page_alloc = &ring->page_alloc[i];
197 en_dbg(DRV, priv, "Freeing allocator:%d count:%d\n",
198 i, page_count(page_alloc->page));
200 dma_unmap_page(priv->ddev, page_alloc->dma,
201 page_alloc->page_size, PCI_DMA_FROMDEVICE);
202 while (page_alloc->page_offset + frag_info->frag_stride <
203 page_alloc->page_size) {
204 put_page(page_alloc->page);
205 page_alloc->page_offset += frag_info->frag_stride;
207 page_alloc->page = NULL;
211 static void mlx4_en_init_rx_desc(struct mlx4_en_priv *priv,
212 struct mlx4_en_rx_ring *ring, int index)
214 struct mlx4_en_rx_desc *rx_desc = ring->buf + ring->stride * index;
218 /* Set size and memtype fields */
219 for (i = 0; i < priv->num_frags; i++) {
220 rx_desc->data[i].byte_count =
221 cpu_to_be32(priv->frag_info[i].frag_size);
222 rx_desc->data[i].lkey = cpu_to_be32(priv->mdev->mr.key);
225 /* If the number of used fragments does not fill up the ring stride,
226 * remaining (unused) fragments must be padded with null address/size
227 * and a special memory key */
228 possible_frags = (ring->stride - sizeof(struct mlx4_en_rx_desc)) / DS_SIZE;
229 for (i = priv->num_frags; i < possible_frags; i++) {
230 rx_desc->data[i].byte_count = 0;
231 rx_desc->data[i].lkey = cpu_to_be32(MLX4_EN_MEMTYPE_PAD);
232 rx_desc->data[i].addr = 0;
236 static int mlx4_en_prepare_rx_desc(struct mlx4_en_priv *priv,
237 struct mlx4_en_rx_ring *ring, int index,
240 struct mlx4_en_rx_desc *rx_desc = ring->buf + (index * ring->stride);
241 struct mlx4_en_rx_alloc *frags = ring->rx_info +
242 (index << priv->log_rx_info);
244 return mlx4_en_alloc_frags(priv, rx_desc, frags, ring->page_alloc, gfp);
247 static inline bool mlx4_en_is_ring_empty(struct mlx4_en_rx_ring *ring)
249 return ring->prod == ring->cons;
252 static inline void mlx4_en_update_rx_prod_db(struct mlx4_en_rx_ring *ring)
254 *ring->wqres.db.db = cpu_to_be32(ring->prod & 0xffff);
257 static void mlx4_en_free_rx_desc(struct mlx4_en_priv *priv,
258 struct mlx4_en_rx_ring *ring,
261 struct mlx4_en_rx_alloc *frags;
264 frags = ring->rx_info + (index << priv->log_rx_info);
265 for (nr = 0; nr < priv->num_frags; nr++) {
266 en_dbg(DRV, priv, "Freeing fragment:%d\n", nr);
267 mlx4_en_free_frag(priv, frags, nr);
271 static int mlx4_en_fill_rx_buffers(struct mlx4_en_priv *priv)
273 struct mlx4_en_rx_ring *ring;
278 for (buf_ind = 0; buf_ind < priv->prof->rx_ring_size; buf_ind++) {
279 for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
280 ring = priv->rx_ring[ring_ind];
282 if (mlx4_en_prepare_rx_desc(priv, ring,
284 GFP_KERNEL | __GFP_COLD)) {
285 if (ring->actual_size < MLX4_EN_MIN_RX_SIZE) {
286 en_err(priv, "Failed to allocate enough rx buffers\n");
289 new_size = rounddown_pow_of_two(ring->actual_size);
290 en_warn(priv, "Only %d buffers allocated reducing ring size to %d\n",
291 ring->actual_size, new_size);
302 for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
303 ring = priv->rx_ring[ring_ind];
304 while (ring->actual_size > new_size) {
307 mlx4_en_free_rx_desc(priv, ring, ring->actual_size);
314 static void mlx4_en_free_rx_buf(struct mlx4_en_priv *priv,
315 struct mlx4_en_rx_ring *ring)
319 en_dbg(DRV, priv, "Freeing Rx buf - cons:%d prod:%d\n",
320 ring->cons, ring->prod);
322 /* Unmap and free Rx buffers */
323 while (!mlx4_en_is_ring_empty(ring)) {
324 index = ring->cons & ring->size_mask;
325 en_dbg(DRV, priv, "Processing descriptor:%d\n", index);
326 mlx4_en_free_rx_desc(priv, ring, index);
331 void mlx4_en_set_num_rx_rings(struct mlx4_en_dev *mdev)
336 struct mlx4_dev *dev = mdev->dev;
338 mlx4_foreach_port(i, dev, MLX4_PORT_TYPE_ETH) {
339 num_of_eqs = max_t(int, MIN_RX_RINGS,
341 mlx4_get_eqs_per_port(mdev->dev, i),
344 num_rx_rings = mlx4_low_memory_profile() ? MIN_RX_RINGS :
345 min_t(int, num_of_eqs,
346 netif_get_num_default_rss_queues());
347 mdev->profile.prof[i].rx_ring_num =
348 rounddown_pow_of_two(num_rx_rings);
352 int mlx4_en_create_rx_ring(struct mlx4_en_priv *priv,
353 struct mlx4_en_rx_ring **pring,
354 u32 size, u16 stride, int node)
356 struct mlx4_en_dev *mdev = priv->mdev;
357 struct mlx4_en_rx_ring *ring;
361 ring = kzalloc_node(sizeof(*ring), GFP_KERNEL, node);
363 ring = kzalloc(sizeof(*ring), GFP_KERNEL);
365 en_err(priv, "Failed to allocate RX ring structure\n");
373 ring->size_mask = size - 1;
374 ring->stride = stride;
375 ring->log_stride = ffs(ring->stride) - 1;
376 ring->buf_size = ring->size * ring->stride + TXBB_SIZE;
378 tmp = size * roundup_pow_of_two(MLX4_EN_MAX_RX_FRAGS *
379 sizeof(struct mlx4_en_rx_alloc));
380 ring->rx_info = vmalloc_node(tmp, node);
381 if (!ring->rx_info) {
382 ring->rx_info = vmalloc(tmp);
383 if (!ring->rx_info) {
389 en_dbg(DRV, priv, "Allocated rx_info ring at addr:%p size:%d\n",
392 /* Allocate HW buffers on provided NUMA node */
393 set_dev_node(&mdev->dev->persist->pdev->dev, node);
394 err = mlx4_alloc_hwq_res(mdev->dev, &ring->wqres,
395 ring->buf_size, 2 * PAGE_SIZE);
396 set_dev_node(&mdev->dev->persist->pdev->dev, mdev->dev->numa_node);
400 err = mlx4_en_map_buffer(&ring->wqres.buf);
402 en_err(priv, "Failed to map RX buffer\n");
405 ring->buf = ring->wqres.buf.direct.buf;
407 ring->hwtstamp_rx_filter = priv->hwtstamp_config.rx_filter;
413 mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size);
415 vfree(ring->rx_info);
416 ring->rx_info = NULL;
424 int mlx4_en_activate_rx_rings(struct mlx4_en_priv *priv)
426 struct mlx4_en_rx_ring *ring;
430 int stride = roundup_pow_of_two(sizeof(struct mlx4_en_rx_desc) +
431 DS_SIZE * priv->num_frags);
433 for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
434 ring = priv->rx_ring[ring_ind];
438 ring->actual_size = 0;
439 ring->cqn = priv->rx_cq[ring_ind]->mcq.cqn;
441 ring->stride = stride;
442 if (ring->stride <= TXBB_SIZE)
443 ring->buf += TXBB_SIZE;
445 ring->log_stride = ffs(ring->stride) - 1;
446 ring->buf_size = ring->size * ring->stride;
448 memset(ring->buf, 0, ring->buf_size);
449 mlx4_en_update_rx_prod_db(ring);
451 /* Initialize all descriptors */
452 for (i = 0; i < ring->size; i++)
453 mlx4_en_init_rx_desc(priv, ring, i);
455 /* Initialize page allocators */
456 err = mlx4_en_init_allocator(priv, ring);
458 en_err(priv, "Failed initializing ring allocator\n");
459 if (ring->stride <= TXBB_SIZE)
460 ring->buf -= TXBB_SIZE;
465 err = mlx4_en_fill_rx_buffers(priv);
469 for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
470 ring = priv->rx_ring[ring_ind];
472 ring->size_mask = ring->actual_size - 1;
473 mlx4_en_update_rx_prod_db(ring);
479 for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++)
480 mlx4_en_free_rx_buf(priv, priv->rx_ring[ring_ind]);
482 ring_ind = priv->rx_ring_num - 1;
484 while (ring_ind >= 0) {
485 if (priv->rx_ring[ring_ind]->stride <= TXBB_SIZE)
486 priv->rx_ring[ring_ind]->buf -= TXBB_SIZE;
487 mlx4_en_destroy_allocator(priv, priv->rx_ring[ring_ind]);
493 /* We recover from out of memory by scheduling our napi poll
494 * function (mlx4_en_process_cq), which tries to allocate
495 * all missing RX buffers (call to mlx4_en_refill_rx_buffers).
497 void mlx4_en_recover_from_oom(struct mlx4_en_priv *priv)
504 for (ring = 0; ring < priv->rx_ring_num; ring++) {
505 if (mlx4_en_is_ring_empty(priv->rx_ring[ring]))
506 napi_reschedule(&priv->rx_cq[ring]->napi);
510 void mlx4_en_destroy_rx_ring(struct mlx4_en_priv *priv,
511 struct mlx4_en_rx_ring **pring,
512 u32 size, u16 stride)
514 struct mlx4_en_dev *mdev = priv->mdev;
515 struct mlx4_en_rx_ring *ring = *pring;
517 mlx4_en_unmap_buffer(&ring->wqres.buf);
518 mlx4_free_hwq_res(mdev->dev, &ring->wqres, size * stride + TXBB_SIZE);
519 vfree(ring->rx_info);
520 ring->rx_info = NULL;
523 #ifdef CONFIG_RFS_ACCEL
524 mlx4_en_cleanup_filters(priv);
528 void mlx4_en_deactivate_rx_ring(struct mlx4_en_priv *priv,
529 struct mlx4_en_rx_ring *ring)
531 mlx4_en_free_rx_buf(priv, ring);
532 if (ring->stride <= TXBB_SIZE)
533 ring->buf -= TXBB_SIZE;
534 mlx4_en_destroy_allocator(priv, ring);
538 static int mlx4_en_complete_rx_desc(struct mlx4_en_priv *priv,
539 struct mlx4_en_rx_desc *rx_desc,
540 struct mlx4_en_rx_alloc *frags,
544 struct skb_frag_struct *skb_frags_rx = skb_shinfo(skb)->frags;
545 struct mlx4_en_frag_info *frag_info;
549 /* Collect used fragments while replacing them in the HW descriptors */
550 for (nr = 0; nr < priv->num_frags; nr++) {
551 frag_info = &priv->frag_info[nr];
552 if (length <= frag_info->frag_prefix_size)
557 dma = be64_to_cpu(rx_desc->data[nr].addr);
558 dma_sync_single_for_cpu(priv->ddev, dma, frag_info->frag_size,
561 /* Save page reference in skb */
562 __skb_frag_set_page(&skb_frags_rx[nr], frags[nr].page);
563 skb_frag_size_set(&skb_frags_rx[nr], frag_info->frag_size);
564 skb_frags_rx[nr].page_offset = frags[nr].page_offset;
565 skb->truesize += frag_info->frag_stride;
566 frags[nr].page = NULL;
568 /* Adjust size of last fragment to match actual length */
570 skb_frag_size_set(&skb_frags_rx[nr - 1],
571 length - priv->frag_info[nr - 1].frag_prefix_size);
577 __skb_frag_unref(&skb_frags_rx[nr]);
583 static struct sk_buff *mlx4_en_rx_skb(struct mlx4_en_priv *priv,
584 struct mlx4_en_rx_desc *rx_desc,
585 struct mlx4_en_rx_alloc *frags,
593 skb = netdev_alloc_skb(priv->dev, SMALL_PACKET_SIZE + NET_IP_ALIGN);
595 en_dbg(RX_ERR, priv, "Failed allocating skb\n");
598 skb_reserve(skb, NET_IP_ALIGN);
601 /* Get pointer to first fragment so we could copy the headers into the
602 * (linear part of the) skb */
603 va = page_address(frags[0].page) + frags[0].page_offset;
605 if (length <= SMALL_PACKET_SIZE) {
606 /* We are copying all relevant data to the skb - temporarily
607 * sync buffers for the copy */
608 dma = be64_to_cpu(rx_desc->data[0].addr);
609 dma_sync_single_for_cpu(priv->ddev, dma, length,
611 skb_copy_to_linear_data(skb, va, length);
614 unsigned int pull_len;
616 /* Move relevant fragments to skb */
617 used_frags = mlx4_en_complete_rx_desc(priv, rx_desc, frags,
619 if (unlikely(!used_frags)) {
623 skb_shinfo(skb)->nr_frags = used_frags;
625 pull_len = eth_get_headlen(va, SMALL_PACKET_SIZE);
626 /* Copy headers into the skb linear buffer */
627 memcpy(skb->data, va, pull_len);
628 skb->tail += pull_len;
630 /* Skip headers in first fragment */
631 skb_shinfo(skb)->frags[0].page_offset += pull_len;
633 /* Adjust size of first fragment */
634 skb_frag_size_sub(&skb_shinfo(skb)->frags[0], pull_len);
635 skb->data_len = length - pull_len;
640 static void validate_loopback(struct mlx4_en_priv *priv, struct sk_buff *skb)
643 int offset = ETH_HLEN;
645 for (i = 0; i < MLX4_LOOPBACK_TEST_PAYLOAD; i++, offset++) {
646 if (*(skb->data + offset) != (unsigned char) (i & 0xff))
650 priv->loopback_ok = 1;
653 dev_kfree_skb_any(skb);
656 static void mlx4_en_refill_rx_buffers(struct mlx4_en_priv *priv,
657 struct mlx4_en_rx_ring *ring)
659 int index = ring->prod & ring->size_mask;
661 while ((u32) (ring->prod - ring->cons) < ring->actual_size) {
662 if (mlx4_en_prepare_rx_desc(priv, ring, index,
663 GFP_ATOMIC | __GFP_COLD))
666 index = ring->prod & ring->size_mask;
670 /* When hardware doesn't strip the vlan, we need to calculate the checksum
671 * over it and add it to the hardware's checksum calculation
673 static inline __wsum get_fixed_vlan_csum(__wsum hw_checksum,
674 struct vlan_hdr *vlanh)
676 return csum_add(hw_checksum, *(__wsum *)vlanh);
679 /* Although the stack expects checksum which doesn't include the pseudo
680 * header, the HW adds it. To address that, we are subtracting the pseudo
681 * header checksum from the checksum value provided by the HW.
683 static void get_fixed_ipv4_csum(__wsum hw_checksum, struct sk_buff *skb,
686 __u16 length_for_csum = 0;
687 __wsum csum_pseudo_header = 0;
689 length_for_csum = (be16_to_cpu(iph->tot_len) - (iph->ihl << 2));
690 csum_pseudo_header = csum_tcpudp_nofold(iph->saddr, iph->daddr,
691 length_for_csum, iph->protocol, 0);
692 skb->csum = csum_sub(hw_checksum, csum_pseudo_header);
695 #if IS_ENABLED(CONFIG_IPV6)
696 /* In IPv6 packets, besides subtracting the pseudo header checksum,
697 * we also compute/add the IP header checksum which
698 * is not added by the HW.
700 static int get_fixed_ipv6_csum(__wsum hw_checksum, struct sk_buff *skb,
701 struct ipv6hdr *ipv6h)
703 __wsum csum_pseudo_hdr = 0;
705 if (ipv6h->nexthdr == IPPROTO_FRAGMENT || ipv6h->nexthdr == IPPROTO_HOPOPTS)
707 hw_checksum = csum_add(hw_checksum, (__force __wsum)(ipv6h->nexthdr << 8));
709 csum_pseudo_hdr = csum_partial(&ipv6h->saddr,
710 sizeof(ipv6h->saddr) + sizeof(ipv6h->daddr), 0);
711 csum_pseudo_hdr = csum_add(csum_pseudo_hdr, (__force __wsum)ipv6h->payload_len);
712 csum_pseudo_hdr = csum_add(csum_pseudo_hdr, (__force __wsum)ntohs(ipv6h->nexthdr));
714 skb->csum = csum_sub(hw_checksum, csum_pseudo_hdr);
715 skb->csum = csum_add(skb->csum, csum_partial(ipv6h, sizeof(struct ipv6hdr), 0));
719 static int check_csum(struct mlx4_cqe *cqe, struct sk_buff *skb, void *va,
720 netdev_features_t dev_features)
722 __wsum hw_checksum = 0;
724 void *hdr = (u8 *)va + sizeof(struct ethhdr);
726 hw_checksum = csum_unfold((__force __sum16)cqe->checksum);
728 if (cqe->vlan_my_qpn & cpu_to_be32(MLX4_CQE_CVLAN_PRESENT_MASK) &&
729 !(dev_features & NETIF_F_HW_VLAN_CTAG_RX)) {
730 hw_checksum = get_fixed_vlan_csum(hw_checksum, hdr);
731 hdr += sizeof(struct vlan_hdr);
734 if (cqe->status & cpu_to_be16(MLX4_CQE_STATUS_IPV4))
735 get_fixed_ipv4_csum(hw_checksum, skb, hdr);
736 #if IS_ENABLED(CONFIG_IPV6)
737 else if (cqe->status & cpu_to_be16(MLX4_CQE_STATUS_IPV6))
738 if (get_fixed_ipv6_csum(hw_checksum, skb, hdr))
744 int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int budget)
746 struct mlx4_en_priv *priv = netdev_priv(dev);
747 struct mlx4_en_dev *mdev = priv->mdev;
748 struct mlx4_cqe *cqe;
749 struct mlx4_en_rx_ring *ring = priv->rx_ring[cq->ring];
750 struct mlx4_en_rx_alloc *frags;
751 struct mlx4_en_rx_desc *rx_desc;
758 int factor = priv->cqe_factor;
768 /* We assume a 1:1 mapping between CQEs and Rx descriptors, so Rx
769 * descriptor offset can be deduced from the CQE index instead of
770 * reading 'cqe->index' */
771 index = cq->mcq.cons_index & ring->size_mask;
772 cqe = mlx4_en_get_cqe(cq->buf, index, priv->cqe_size) + factor;
774 /* Process all completed CQEs */
775 while (XNOR(cqe->owner_sr_opcode & MLX4_CQE_OWNER_MASK,
776 cq->mcq.cons_index & cq->size)) {
778 frags = ring->rx_info + (index << priv->log_rx_info);
779 rx_desc = ring->buf + (index << ring->log_stride);
782 * make sure we read the CQE after we read the ownership bit
786 /* Drop packet on bad receive or bad checksum */
787 if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) ==
788 MLX4_CQE_OPCODE_ERROR)) {
789 en_err(priv, "CQE completed in error - vendor syndrom:%d syndrom:%d\n",
790 ((struct mlx4_err_cqe *)cqe)->vendor_err_syndrome,
791 ((struct mlx4_err_cqe *)cqe)->syndrome);
794 if (unlikely(cqe->badfcs_enc & MLX4_CQE_BAD_FCS)) {
795 en_dbg(RX_ERR, priv, "Accepted frame with bad FCS\n");
799 /* Check if we need to drop the packet if SRIOV is not enabled
800 * and not performing the selftest or flb disabled
802 if (priv->flags & MLX4_EN_FLAG_RX_FILTER_NEEDED) {
805 /* Get pointer to first fragment since we haven't
806 * skb yet and cast it to ethhdr struct
808 dma = be64_to_cpu(rx_desc->data[0].addr);
809 dma_sync_single_for_cpu(priv->ddev, dma, sizeof(*ethh),
811 ethh = (struct ethhdr *)(page_address(frags[0].page) +
812 frags[0].page_offset);
814 if (is_multicast_ether_addr(ethh->h_dest)) {
815 struct mlx4_mac_entry *entry;
816 struct hlist_head *bucket;
817 unsigned int mac_hash;
819 /* Drop the packet, since HW loopback-ed it */
820 mac_hash = ethh->h_source[MLX4_EN_MAC_HASH_IDX];
821 bucket = &priv->mac_hash[mac_hash];
823 hlist_for_each_entry_rcu(entry, bucket, hlist) {
824 if (ether_addr_equal_64bits(entry->mac,
835 * Packet is OK - process it.
837 length = be32_to_cpu(cqe->byte_cnt);
838 length -= ring->fcs_del;
839 ring->bytes += length;
841 l2_tunnel = (dev->hw_enc_features & NETIF_F_RXCSUM) &&
842 (cqe->vlan_my_qpn & cpu_to_be32(MLX4_CQE_L2_TUNNEL));
844 if (likely(dev->features & NETIF_F_RXCSUM)) {
845 if (cqe->status & cpu_to_be16(MLX4_CQE_STATUS_TCP |
846 MLX4_CQE_STATUS_UDP)) {
847 if ((cqe->status & cpu_to_be16(MLX4_CQE_STATUS_IPOK)) &&
848 cqe->checksum == cpu_to_be16(0xffff)) {
849 ip_summed = CHECKSUM_UNNECESSARY;
852 ip_summed = CHECKSUM_NONE;
856 if (priv->flags & MLX4_EN_FLAG_RX_CSUM_NON_TCP_UDP &&
857 (cqe->status & cpu_to_be16(MLX4_CQE_STATUS_IPV4 |
858 MLX4_CQE_STATUS_IPV6))) {
859 ip_summed = CHECKSUM_COMPLETE;
860 ring->csum_complete++;
862 ip_summed = CHECKSUM_NONE;
867 ip_summed = CHECKSUM_NONE;
871 /* This packet is eligible for GRO if it is:
872 * - DIX Ethernet (type interpretation)
874 * - without IP options
875 * - not an IP fragment
876 * - no LLS polling in progress
878 if (!mlx4_en_cq_busy_polling(cq) &&
879 (dev->features & NETIF_F_GRO)) {
880 struct sk_buff *gro_skb = napi_get_frags(&cq->napi);
884 nr = mlx4_en_complete_rx_desc(priv,
885 rx_desc, frags, gro_skb,
890 if (ip_summed == CHECKSUM_COMPLETE) {
891 void *va = skb_frag_address(skb_shinfo(gro_skb)->frags);
892 if (check_csum(cqe, gro_skb, va,
894 ip_summed = CHECKSUM_NONE;
896 ring->csum_complete--;
900 skb_shinfo(gro_skb)->nr_frags = nr;
901 gro_skb->len = length;
902 gro_skb->data_len = length;
903 gro_skb->ip_summed = ip_summed;
905 if (l2_tunnel && ip_summed == CHECKSUM_UNNECESSARY)
906 gro_skb->csum_level = 1;
908 if ((cqe->vlan_my_qpn &
909 cpu_to_be32(MLX4_CQE_CVLAN_PRESENT_MASK)) &&
910 (dev->features & NETIF_F_HW_VLAN_CTAG_RX)) {
911 u16 vid = be16_to_cpu(cqe->sl_vid);
913 __vlan_hwaccel_put_tag(gro_skb, htons(ETH_P_8021Q), vid);
914 } else if ((be32_to_cpu(cqe->vlan_my_qpn) &
915 MLX4_CQE_SVLAN_PRESENT_MASK) &&
916 (dev->features & NETIF_F_HW_VLAN_STAG_RX)) {
917 __vlan_hwaccel_put_tag(gro_skb,
919 be16_to_cpu(cqe->sl_vid));
922 if (dev->features & NETIF_F_RXHASH)
923 skb_set_hash(gro_skb,
924 be32_to_cpu(cqe->immed_rss_invalid),
925 (ip_summed == CHECKSUM_UNNECESSARY) ?
929 skb_record_rx_queue(gro_skb, cq->ring);
930 skb_mark_napi_id(gro_skb, &cq->napi);
932 if (ring->hwtstamp_rx_filter == HWTSTAMP_FILTER_ALL) {
933 timestamp = mlx4_en_get_cqe_ts(cqe);
934 mlx4_en_fill_hwtstamps(mdev,
935 skb_hwtstamps(gro_skb),
939 napi_gro_frags(&cq->napi);
943 /* GRO not possible, complete processing here */
944 skb = mlx4_en_rx_skb(priv, rx_desc, frags, length);
946 priv->stats.rx_dropped++;
950 if (unlikely(priv->validate_loopback)) {
951 validate_loopback(priv, skb);
955 if (ip_summed == CHECKSUM_COMPLETE) {
956 if (check_csum(cqe, skb, skb->data, dev->features)) {
957 ip_summed = CHECKSUM_NONE;
958 ring->csum_complete--;
963 skb->ip_summed = ip_summed;
964 skb->protocol = eth_type_trans(skb, dev);
965 skb_record_rx_queue(skb, cq->ring);
967 if (l2_tunnel && ip_summed == CHECKSUM_UNNECESSARY)
970 if (dev->features & NETIF_F_RXHASH)
972 be32_to_cpu(cqe->immed_rss_invalid),
973 (ip_summed == CHECKSUM_UNNECESSARY) ?
977 if ((be32_to_cpu(cqe->vlan_my_qpn) &
978 MLX4_CQE_CVLAN_PRESENT_MASK) &&
979 (dev->features & NETIF_F_HW_VLAN_CTAG_RX))
980 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), be16_to_cpu(cqe->sl_vid));
981 else if ((be32_to_cpu(cqe->vlan_my_qpn) &
982 MLX4_CQE_SVLAN_PRESENT_MASK) &&
983 (dev->features & NETIF_F_HW_VLAN_STAG_RX))
984 __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021AD),
985 be16_to_cpu(cqe->sl_vid));
987 if (ring->hwtstamp_rx_filter == HWTSTAMP_FILTER_ALL) {
988 timestamp = mlx4_en_get_cqe_ts(cqe);
989 mlx4_en_fill_hwtstamps(mdev, skb_hwtstamps(skb),
993 skb_mark_napi_id(skb, &cq->napi);
995 if (!mlx4_en_cq_busy_polling(cq))
996 napi_gro_receive(&cq->napi, skb);
998 netif_receive_skb(skb);
1001 for (nr = 0; nr < priv->num_frags; nr++)
1002 mlx4_en_free_frag(priv, frags, nr);
1004 ++cq->mcq.cons_index;
1005 index = (cq->mcq.cons_index) & ring->size_mask;
1006 cqe = mlx4_en_get_cqe(cq->buf, index, priv->cqe_size) + factor;
1007 if (++polled == budget)
1012 AVG_PERF_COUNTER(priv->pstats.rx_coal_avg, polled);
1013 mlx4_cq_set_ci(&cq->mcq);
1014 wmb(); /* ensure HW sees CQ consumer before we post new buffers */
1015 ring->cons = cq->mcq.cons_index;
1016 mlx4_en_refill_rx_buffers(priv, ring);
1017 mlx4_en_update_rx_prod_db(ring);
1022 void mlx4_en_rx_irq(struct mlx4_cq *mcq)
1024 struct mlx4_en_cq *cq = container_of(mcq, struct mlx4_en_cq, mcq);
1025 struct mlx4_en_priv *priv = netdev_priv(cq->dev);
1027 if (likely(priv->port_up))
1028 napi_schedule_irqoff(&cq->napi);
1030 mlx4_en_arm_cq(priv, cq);
1033 /* Rx CQ polling - called by NAPI */
1034 int mlx4_en_poll_rx_cq(struct napi_struct *napi, int budget)
1036 struct mlx4_en_cq *cq = container_of(napi, struct mlx4_en_cq, napi);
1037 struct net_device *dev = cq->dev;
1038 struct mlx4_en_priv *priv = netdev_priv(dev);
1041 if (!mlx4_en_cq_lock_napi(cq))
1044 done = mlx4_en_process_rx_cq(dev, cq, budget);
1046 mlx4_en_cq_unlock_napi(cq);
1048 /* If we used up all the quota - we're probably not done yet... */
1049 if (done == budget) {
1050 const struct cpumask *aff;
1051 struct irq_data *idata;
1054 INC_PERF_COUNTER(priv->pstats.napi_quota);
1056 cpu_curr = smp_processor_id();
1057 idata = irq_desc_get_irq_data(cq->irq_desc);
1058 aff = irq_data_get_affinity_mask(idata);
1060 if (likely(cpumask_test_cpu(cpu_curr, aff)))
1063 /* Current cpu is not according to smp_irq_affinity -
1064 * probably affinity changed. need to stop this NAPI
1065 * poll, and restart it on the right CPU
1070 napi_complete_done(napi, done);
1071 mlx4_en_arm_cq(priv, cq);
1075 static const int frag_sizes[] = {
1082 void mlx4_en_calc_rx_buf(struct net_device *dev)
1084 struct mlx4_en_priv *priv = netdev_priv(dev);
1085 /* VLAN_HLEN is added twice,to support skb vlan tagged with multiple
1086 * headers. (For example: ETH_P_8021Q and ETH_P_8021AD).
1088 int eff_mtu = dev->mtu + ETH_HLEN + (2 * VLAN_HLEN);
1092 while (buf_size < eff_mtu) {
1093 priv->frag_info[i].frag_size =
1094 (eff_mtu > buf_size + frag_sizes[i]) ?
1095 frag_sizes[i] : eff_mtu - buf_size;
1096 priv->frag_info[i].frag_prefix_size = buf_size;
1097 priv->frag_info[i].frag_stride =
1098 ALIGN(priv->frag_info[i].frag_size,
1100 buf_size += priv->frag_info[i].frag_size;
1104 priv->num_frags = i;
1105 priv->rx_skb_size = eff_mtu;
1106 priv->log_rx_info = ROUNDUP_LOG2(i * sizeof(struct mlx4_en_rx_alloc));
1108 en_dbg(DRV, priv, "Rx buffer scatter-list (effective-mtu:%d num_frags:%d):\n",
1109 eff_mtu, priv->num_frags);
1110 for (i = 0; i < priv->num_frags; i++) {
1112 " frag:%d - size:%d prefix:%d stride:%d\n",
1114 priv->frag_info[i].frag_size,
1115 priv->frag_info[i].frag_prefix_size,
1116 priv->frag_info[i].frag_stride);
1120 /* RSS related functions */
1122 static int mlx4_en_config_rss_qp(struct mlx4_en_priv *priv, int qpn,
1123 struct mlx4_en_rx_ring *ring,
1124 enum mlx4_qp_state *state,
1127 struct mlx4_en_dev *mdev = priv->mdev;
1128 struct mlx4_qp_context *context;
1131 context = kmalloc(sizeof(*context), GFP_KERNEL);
1135 err = mlx4_qp_alloc(mdev->dev, qpn, qp, GFP_KERNEL);
1137 en_err(priv, "Failed to allocate qp #%x\n", qpn);
1140 qp->event = mlx4_en_sqp_event;
1142 memset(context, 0, sizeof *context);
1143 mlx4_en_fill_qp_context(priv, ring->actual_size, ring->stride, 0, 0,
1144 qpn, ring->cqn, -1, context);
1145 context->db_rec_addr = cpu_to_be64(ring->wqres.db.dma);
1147 /* Cancel FCS removal if FW allows */
1148 if (mdev->dev->caps.flags & MLX4_DEV_CAP_FLAG_FCS_KEEP) {
1149 context->param3 |= cpu_to_be32(1 << 29);
1150 if (priv->dev->features & NETIF_F_RXFCS)
1153 ring->fcs_del = ETH_FCS_LEN;
1157 err = mlx4_qp_to_ready(mdev->dev, &ring->wqres.mtt, context, qp, state);
1159 mlx4_qp_remove(mdev->dev, qp);
1160 mlx4_qp_free(mdev->dev, qp);
1162 mlx4_en_update_rx_prod_db(ring);
1168 int mlx4_en_create_drop_qp(struct mlx4_en_priv *priv)
1173 err = mlx4_qp_reserve_range(priv->mdev->dev, 1, 1, &qpn,
1174 MLX4_RESERVE_A0_QP);
1176 en_err(priv, "Failed reserving drop qpn\n");
1179 err = mlx4_qp_alloc(priv->mdev->dev, qpn, &priv->drop_qp, GFP_KERNEL);
1181 en_err(priv, "Failed allocating drop qp\n");
1182 mlx4_qp_release_range(priv->mdev->dev, qpn, 1);
1189 void mlx4_en_destroy_drop_qp(struct mlx4_en_priv *priv)
1193 qpn = priv->drop_qp.qpn;
1194 mlx4_qp_remove(priv->mdev->dev, &priv->drop_qp);
1195 mlx4_qp_free(priv->mdev->dev, &priv->drop_qp);
1196 mlx4_qp_release_range(priv->mdev->dev, qpn, 1);
1199 /* Allocate rx qp's and configure them according to rss map */
1200 int mlx4_en_config_rss_steer(struct mlx4_en_priv *priv)
1202 struct mlx4_en_dev *mdev = priv->mdev;
1203 struct mlx4_en_rss_map *rss_map = &priv->rss_map;
1204 struct mlx4_qp_context context;
1205 struct mlx4_rss_context *rss_context;
1208 u8 rss_mask = (MLX4_RSS_IPV4 | MLX4_RSS_TCP_IPV4 | MLX4_RSS_IPV6 |
1214 en_dbg(DRV, priv, "Configuring rss steering\n");
1215 err = mlx4_qp_reserve_range(mdev->dev, priv->rx_ring_num,
1217 &rss_map->base_qpn, 0);
1219 en_err(priv, "Failed reserving %d qps\n", priv->rx_ring_num);
1223 for (i = 0; i < priv->rx_ring_num; i++) {
1224 qpn = rss_map->base_qpn + i;
1225 err = mlx4_en_config_rss_qp(priv, qpn, priv->rx_ring[i],
1234 /* Configure RSS indirection qp */
1235 err = mlx4_qp_alloc(mdev->dev, priv->base_qpn, &rss_map->indir_qp, GFP_KERNEL);
1237 en_err(priv, "Failed to allocate RSS indirection QP\n");
1240 rss_map->indir_qp.event = mlx4_en_sqp_event;
1241 mlx4_en_fill_qp_context(priv, 0, 0, 0, 1, priv->base_qpn,
1242 priv->rx_ring[0]->cqn, -1, &context);
1244 if (!priv->prof->rss_rings || priv->prof->rss_rings > priv->rx_ring_num)
1245 rss_rings = priv->rx_ring_num;
1247 rss_rings = priv->prof->rss_rings;
1249 ptr = ((void *) &context) + offsetof(struct mlx4_qp_context, pri_path)
1250 + MLX4_RSS_OFFSET_IN_QPC_PRI_PATH;
1252 rss_context->base_qpn = cpu_to_be32(ilog2(rss_rings) << 24 |
1253 (rss_map->base_qpn));
1254 rss_context->default_qpn = cpu_to_be32(rss_map->base_qpn);
1255 if (priv->mdev->profile.udp_rss) {
1256 rss_mask |= MLX4_RSS_UDP_IPV4 | MLX4_RSS_UDP_IPV6;
1257 rss_context->base_qpn_udp = rss_context->default_qpn;
1260 if (mdev->dev->caps.tunnel_offload_mode == MLX4_TUNNEL_OFFLOAD_MODE_VXLAN) {
1261 en_info(priv, "Setting RSS context tunnel type to RSS on inner headers\n");
1262 rss_mask |= MLX4_RSS_BY_INNER_HEADERS;
1265 rss_context->flags = rss_mask;
1266 rss_context->hash_fn = MLX4_RSS_HASH_TOP;
1267 if (priv->rss_hash_fn == ETH_RSS_HASH_XOR) {
1268 rss_context->hash_fn = MLX4_RSS_HASH_XOR;
1269 } else if (priv->rss_hash_fn == ETH_RSS_HASH_TOP) {
1270 rss_context->hash_fn = MLX4_RSS_HASH_TOP;
1271 memcpy(rss_context->rss_key, priv->rss_key,
1272 MLX4_EN_RSS_KEY_SIZE);
1274 en_err(priv, "Unknown RSS hash function requested\n");
1278 err = mlx4_qp_to_ready(mdev->dev, &priv->res.mtt, &context,
1279 &rss_map->indir_qp, &rss_map->indir_state);
1286 mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
1287 MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->indir_qp);
1288 mlx4_qp_remove(mdev->dev, &rss_map->indir_qp);
1289 mlx4_qp_free(mdev->dev, &rss_map->indir_qp);
1291 for (i = 0; i < good_qps; i++) {
1292 mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i],
1293 MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->qps[i]);
1294 mlx4_qp_remove(mdev->dev, &rss_map->qps[i]);
1295 mlx4_qp_free(mdev->dev, &rss_map->qps[i]);
1297 mlx4_qp_release_range(mdev->dev, rss_map->base_qpn, priv->rx_ring_num);
1301 void mlx4_en_release_rss_steer(struct mlx4_en_priv *priv)
1303 struct mlx4_en_dev *mdev = priv->mdev;
1304 struct mlx4_en_rss_map *rss_map = &priv->rss_map;
1307 mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
1308 MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->indir_qp);
1309 mlx4_qp_remove(mdev->dev, &rss_map->indir_qp);
1310 mlx4_qp_free(mdev->dev, &rss_map->indir_qp);
1312 for (i = 0; i < priv->rx_ring_num; i++) {
1313 mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i],
1314 MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->qps[i]);
1315 mlx4_qp_remove(mdev->dev, &rss_map->qps[i]);
1316 mlx4_qp_free(mdev->dev, &rss_map->qps[i]);
1318 mlx4_qp_release_range(mdev->dev, rss_map->base_qpn, priv->rx_ring_num);