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 <linux/mlx4/cq.h>
35 #include <linux/slab.h>
36 #include <linux/mlx4/qp.h>
37 #include <linux/skbuff.h>
38 #include <linux/if_ether.h>
39 #include <linux/if_vlan.h>
40 #include <linux/vmalloc.h>
45 static int mlx4_en_alloc_frag(struct mlx4_en_priv *priv,
46 struct mlx4_en_rx_desc *rx_desc,
47 struct page_frag *skb_frags,
48 struct mlx4_en_rx_alloc *ring_alloc,
51 struct mlx4_en_frag_info *frag_info = &priv->frag_info[i];
52 struct mlx4_en_rx_alloc *page_alloc = &ring_alloc[i];
56 if (page_alloc->offset == frag_info->last_offset) {
57 /* Allocate new page */
58 page = alloc_pages(GFP_ATOMIC | __GFP_COMP, MLX4_EN_ALLOC_ORDER);
62 skb_frags[i].page = page_alloc->page;
63 skb_frags[i].offset = page_alloc->offset;
64 page_alloc->page = page;
65 page_alloc->offset = frag_info->frag_align;
67 page = page_alloc->page;
70 skb_frags[i].page = page;
71 skb_frags[i].offset = page_alloc->offset;
72 page_alloc->offset += frag_info->frag_stride;
74 dma = dma_map_single(priv->ddev, page_address(skb_frags[i].page) +
75 skb_frags[i].offset, frag_info->frag_size,
77 rx_desc->data[i].addr = cpu_to_be64(dma);
81 static int mlx4_en_init_allocator(struct mlx4_en_priv *priv,
82 struct mlx4_en_rx_ring *ring)
84 struct mlx4_en_rx_alloc *page_alloc;
87 for (i = 0; i < priv->num_frags; i++) {
88 page_alloc = &ring->page_alloc[i];
89 page_alloc->page = alloc_pages(GFP_ATOMIC | __GFP_COMP,
91 if (!page_alloc->page)
94 page_alloc->offset = priv->frag_info[i].frag_align;
95 en_dbg(DRV, priv, "Initialized allocator:%d with page:%p\n",
102 page_alloc = &ring->page_alloc[i];
103 put_page(page_alloc->page);
104 page_alloc->page = NULL;
109 static void mlx4_en_destroy_allocator(struct mlx4_en_priv *priv,
110 struct mlx4_en_rx_ring *ring)
112 struct mlx4_en_rx_alloc *page_alloc;
115 for (i = 0; i < priv->num_frags; i++) {
116 page_alloc = &ring->page_alloc[i];
117 en_dbg(DRV, priv, "Freeing allocator:%d count:%d\n",
118 i, page_count(page_alloc->page));
120 put_page(page_alloc->page);
121 page_alloc->page = NULL;
126 static void mlx4_en_init_rx_desc(struct mlx4_en_priv *priv,
127 struct mlx4_en_rx_ring *ring, int index)
129 struct mlx4_en_rx_desc *rx_desc = ring->buf + ring->stride * index;
130 struct skb_frag_struct *skb_frags = ring->rx_info +
131 (index << priv->log_rx_info);
135 /* Set size and memtype fields */
136 for (i = 0; i < priv->num_frags; i++) {
137 skb_frag_size_set(&skb_frags[i], priv->frag_info[i].frag_size);
138 rx_desc->data[i].byte_count =
139 cpu_to_be32(priv->frag_info[i].frag_size);
140 rx_desc->data[i].lkey = cpu_to_be32(priv->mdev->mr.key);
143 /* If the number of used fragments does not fill up the ring stride,
144 * remaining (unused) fragments must be padded with null address/size
145 * and a special memory key */
146 possible_frags = (ring->stride - sizeof(struct mlx4_en_rx_desc)) / DS_SIZE;
147 for (i = priv->num_frags; i < possible_frags; i++) {
148 rx_desc->data[i].byte_count = 0;
149 rx_desc->data[i].lkey = cpu_to_be32(MLX4_EN_MEMTYPE_PAD);
150 rx_desc->data[i].addr = 0;
155 static int mlx4_en_prepare_rx_desc(struct mlx4_en_priv *priv,
156 struct mlx4_en_rx_ring *ring, int index)
158 struct mlx4_en_rx_desc *rx_desc = ring->buf + (index * ring->stride);
159 struct page_frag *skb_frags = ring->rx_info +
160 (index << priv->log_rx_info);
163 for (i = 0; i < priv->num_frags; i++)
164 if (mlx4_en_alloc_frag(priv, rx_desc, skb_frags, ring->page_alloc, i))
171 dma_addr_t dma = be64_to_cpu(rx_desc->data[i].addr);
172 pci_unmap_single(priv->mdev->pdev, dma, skb_frags[i].size,
174 put_page(skb_frags[i].page);
179 static inline void mlx4_en_update_rx_prod_db(struct mlx4_en_rx_ring *ring)
181 *ring->wqres.db.db = cpu_to_be32(ring->prod & 0xffff);
184 static void mlx4_en_free_rx_desc(struct mlx4_en_priv *priv,
185 struct mlx4_en_rx_ring *ring,
188 struct page_frag *skb_frags;
189 struct mlx4_en_rx_desc *rx_desc = ring->buf + (index << ring->log_stride);
193 skb_frags = ring->rx_info + (index << priv->log_rx_info);
194 for (nr = 0; nr < priv->num_frags; nr++) {
195 en_dbg(DRV, priv, "Freeing fragment:%d\n", nr);
196 dma = be64_to_cpu(rx_desc->data[nr].addr);
198 en_dbg(DRV, priv, "Unmapping buffer at dma:0x%llx\n", (u64) dma);
199 dma_unmap_single(priv->ddev, dma, skb_frags[nr].size,
201 put_page(skb_frags[nr].page);
205 static int mlx4_en_fill_rx_buffers(struct mlx4_en_priv *priv)
207 struct mlx4_en_rx_ring *ring;
212 for (buf_ind = 0; buf_ind < priv->prof->rx_ring_size; buf_ind++) {
213 for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
214 ring = &priv->rx_ring[ring_ind];
216 if (mlx4_en_prepare_rx_desc(priv, ring,
217 ring->actual_size)) {
218 if (ring->actual_size < MLX4_EN_MIN_RX_SIZE) {
219 en_err(priv, "Failed to allocate "
220 "enough rx buffers\n");
223 new_size = rounddown_pow_of_two(ring->actual_size);
224 en_warn(priv, "Only %d buffers allocated "
225 "reducing ring size to %d",
226 ring->actual_size, new_size);
237 for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
238 ring = &priv->rx_ring[ring_ind];
239 while (ring->actual_size > new_size) {
242 mlx4_en_free_rx_desc(priv, ring, ring->actual_size);
249 static void mlx4_en_free_rx_buf(struct mlx4_en_priv *priv,
250 struct mlx4_en_rx_ring *ring)
254 en_dbg(DRV, priv, "Freeing Rx buf - cons:%d prod:%d\n",
255 ring->cons, ring->prod);
257 /* Unmap and free Rx buffers */
258 BUG_ON((u32) (ring->prod - ring->cons) > ring->actual_size);
259 while (ring->cons != ring->prod) {
260 index = ring->cons & ring->size_mask;
261 en_dbg(DRV, priv, "Processing descriptor:%d\n", index);
262 mlx4_en_free_rx_desc(priv, ring, index);
267 int mlx4_en_create_rx_ring(struct mlx4_en_priv *priv,
268 struct mlx4_en_rx_ring *ring, u32 size, u16 stride)
270 struct mlx4_en_dev *mdev = priv->mdev;
278 ring->size_mask = size - 1;
279 ring->stride = stride;
280 ring->log_stride = ffs(ring->stride) - 1;
281 ring->buf_size = ring->size * ring->stride + TXBB_SIZE;
283 tmp = size * roundup_pow_of_two(MLX4_EN_MAX_RX_FRAGS *
284 sizeof(struct skb_frag_struct));
285 ring->rx_info = vmalloc(tmp);
289 en_dbg(DRV, priv, "Allocated rx_info ring at addr:%p size:%d\n",
292 err = mlx4_alloc_hwq_res(mdev->dev, &ring->wqres,
293 ring->buf_size, 2 * PAGE_SIZE);
297 err = mlx4_en_map_buffer(&ring->wqres.buf);
299 en_err(priv, "Failed to map RX buffer\n");
302 ring->buf = ring->wqres.buf.direct.buf;
307 mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size);
309 vfree(ring->rx_info);
310 ring->rx_info = NULL;
314 int mlx4_en_activate_rx_rings(struct mlx4_en_priv *priv)
316 struct mlx4_en_rx_ring *ring;
320 int stride = roundup_pow_of_two(sizeof(struct mlx4_en_rx_desc) +
321 DS_SIZE * priv->num_frags);
323 for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
324 ring = &priv->rx_ring[ring_ind];
328 ring->actual_size = 0;
329 ring->cqn = priv->rx_cq[ring_ind].mcq.cqn;
331 ring->stride = stride;
332 if (ring->stride <= TXBB_SIZE)
333 ring->buf += TXBB_SIZE;
335 ring->log_stride = ffs(ring->stride) - 1;
336 ring->buf_size = ring->size * ring->stride;
338 memset(ring->buf, 0, ring->buf_size);
339 mlx4_en_update_rx_prod_db(ring);
341 /* Initailize all descriptors */
342 for (i = 0; i < ring->size; i++)
343 mlx4_en_init_rx_desc(priv, ring, i);
345 /* Initialize page allocators */
346 err = mlx4_en_init_allocator(priv, ring);
348 en_err(priv, "Failed initializing ring allocator\n");
349 if (ring->stride <= TXBB_SIZE)
350 ring->buf -= TXBB_SIZE;
355 err = mlx4_en_fill_rx_buffers(priv);
359 for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
360 ring = &priv->rx_ring[ring_ind];
362 ring->size_mask = ring->actual_size - 1;
363 mlx4_en_update_rx_prod_db(ring);
369 for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++)
370 mlx4_en_free_rx_buf(priv, &priv->rx_ring[ring_ind]);
372 ring_ind = priv->rx_ring_num - 1;
374 while (ring_ind >= 0) {
375 if (priv->rx_ring[ring_ind].stride <= TXBB_SIZE)
376 priv->rx_ring[ring_ind].buf -= TXBB_SIZE;
377 mlx4_en_destroy_allocator(priv, &priv->rx_ring[ring_ind]);
383 void mlx4_en_destroy_rx_ring(struct mlx4_en_priv *priv,
384 struct mlx4_en_rx_ring *ring, u32 size, u16 stride)
386 struct mlx4_en_dev *mdev = priv->mdev;
388 mlx4_en_unmap_buffer(&ring->wqres.buf);
389 mlx4_free_hwq_res(mdev->dev, &ring->wqres, size * stride + TXBB_SIZE);
390 vfree(ring->rx_info);
391 ring->rx_info = NULL;
394 void mlx4_en_deactivate_rx_ring(struct mlx4_en_priv *priv,
395 struct mlx4_en_rx_ring *ring)
397 mlx4_en_free_rx_buf(priv, ring);
398 if (ring->stride <= TXBB_SIZE)
399 ring->buf -= TXBB_SIZE;
400 mlx4_en_destroy_allocator(priv, ring);
404 /* Unmap a completed descriptor and free unused pages */
405 static int mlx4_en_complete_rx_desc(struct mlx4_en_priv *priv,
406 struct mlx4_en_rx_desc *rx_desc,
407 struct page_frag *skb_frags,
409 struct mlx4_en_rx_alloc *page_alloc,
412 struct skb_frag_struct *skb_frags_rx = skb_shinfo(skb)->frags;
413 struct mlx4_en_frag_info *frag_info;
417 /* Collect used fragments while replacing them in the HW descirptors */
418 for (nr = 0; nr < priv->num_frags; nr++) {
419 frag_info = &priv->frag_info[nr];
420 if (length <= frag_info->frag_prefix_size)
423 /* Save page reference in skb */
424 __skb_frag_set_page(&skb_frags_rx[nr], skb_frags[nr].page);
425 skb_frag_size_set(&skb_frags_rx[nr], skb_frags[nr].size);
426 skb_frags_rx[nr].page_offset = skb_frags[nr].offset;
427 skb->truesize += frag_info->frag_stride;
428 dma = be64_to_cpu(rx_desc->data[nr].addr);
430 /* Allocate a replacement page */
431 if (mlx4_en_alloc_frag(priv, rx_desc, skb_frags, page_alloc, nr))
435 dma_unmap_single(priv->ddev, dma, skb_frag_size(&skb_frags_rx[nr]),
438 /* Adjust size of last fragment to match actual length */
440 skb_frag_size_set(&skb_frags_rx[nr - 1],
441 length - priv->frag_info[nr - 1].frag_prefix_size);
445 /* Drop all accumulated fragments (which have already been replaced in
446 * the descriptor) of this packet; remaining fragments are reused... */
449 __skb_frag_unref(&skb_frags_rx[nr]);
455 static struct sk_buff *mlx4_en_rx_skb(struct mlx4_en_priv *priv,
456 struct mlx4_en_rx_desc *rx_desc,
457 struct page_frag *skb_frags,
458 struct mlx4_en_rx_alloc *page_alloc,
466 skb = netdev_alloc_skb(priv->dev, SMALL_PACKET_SIZE + NET_IP_ALIGN);
468 en_dbg(RX_ERR, priv, "Failed allocating skb\n");
471 skb_reserve(skb, NET_IP_ALIGN);
474 /* Get pointer to first fragment so we could copy the headers into the
475 * (linear part of the) skb */
476 va = page_address(skb_frags[0].page) + skb_frags[0].offset;
478 if (length <= SMALL_PACKET_SIZE) {
479 /* We are copying all relevant data to the skb - temporarily
480 * synch buffers for the copy */
481 dma = be64_to_cpu(rx_desc->data[0].addr);
482 dma_sync_single_for_cpu(priv->ddev, dma, length,
484 skb_copy_to_linear_data(skb, va, length);
485 dma_sync_single_for_device(priv->ddev, dma, length,
490 /* Move relevant fragments to skb */
491 used_frags = mlx4_en_complete_rx_desc(priv, rx_desc, skb_frags,
492 skb, page_alloc, length);
493 if (unlikely(!used_frags)) {
497 skb_shinfo(skb)->nr_frags = used_frags;
499 /* Copy headers into the skb linear buffer */
500 memcpy(skb->data, va, HEADER_COPY_SIZE);
501 skb->tail += HEADER_COPY_SIZE;
503 /* Skip headers in first fragment */
504 skb_shinfo(skb)->frags[0].page_offset += HEADER_COPY_SIZE;
506 /* Adjust size of first fragment */
507 skb_frag_size_sub(&skb_shinfo(skb)->frags[0], HEADER_COPY_SIZE);
508 skb->data_len = length - HEADER_COPY_SIZE;
513 static void validate_loopback(struct mlx4_en_priv *priv, struct sk_buff *skb)
516 int offset = ETH_HLEN;
518 for (i = 0; i < MLX4_LOOPBACK_TEST_PAYLOAD; i++, offset++) {
519 if (*(skb->data + offset) != (unsigned char) (i & 0xff))
523 priv->loopback_ok = 1;
526 dev_kfree_skb_any(skb);
529 int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int budget)
531 struct mlx4_en_priv *priv = netdev_priv(dev);
532 struct mlx4_cqe *cqe;
533 struct mlx4_en_rx_ring *ring = &priv->rx_ring[cq->ring];
534 struct page_frag *skb_frags;
535 struct mlx4_en_rx_desc *rx_desc;
548 /* We assume a 1:1 mapping between CQEs and Rx descriptors, so Rx
549 * descriptor offset can be deduced from the CQE index instead of
550 * reading 'cqe->index' */
551 index = cq->mcq.cons_index & ring->size_mask;
552 cqe = &cq->buf[index];
554 /* Process all completed CQEs */
555 while (XNOR(cqe->owner_sr_opcode & MLX4_CQE_OWNER_MASK,
556 cq->mcq.cons_index & cq->size)) {
558 skb_frags = ring->rx_info + (index << priv->log_rx_info);
559 rx_desc = ring->buf + (index << ring->log_stride);
562 * make sure we read the CQE after we read the ownership bit
566 /* Drop packet on bad receive or bad checksum */
567 if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) ==
568 MLX4_CQE_OPCODE_ERROR)) {
569 en_err(priv, "CQE completed in error - vendor "
570 "syndrom:%d syndrom:%d\n",
571 ((struct mlx4_err_cqe *) cqe)->vendor_err_syndrome,
572 ((struct mlx4_err_cqe *) cqe)->syndrome);
575 if (unlikely(cqe->badfcs_enc & MLX4_CQE_BAD_FCS)) {
576 en_dbg(RX_ERR, priv, "Accepted frame with bad FCS\n");
580 /* Get pointer to first fragment since we haven't skb yet and
581 * cast it to ethhdr struct */
582 ethh = (struct ethhdr *)(page_address(skb_frags[0].page) +
583 skb_frags[0].offset);
584 s_mac = mlx4_en_mac_to_u64(ethh->h_source);
586 /* If source MAC is equal to our own MAC and not performing
587 * the selftest or flb disabled - drop the packet */
588 if (s_mac == priv->mac &&
589 (!(dev->features & NETIF_F_LOOPBACK) ||
590 !priv->validate_loopback))
594 * Packet is OK - process it.
596 length = be32_to_cpu(cqe->byte_cnt);
597 length -= ring->fcs_del;
598 ring->bytes += length;
601 if (likely(dev->features & NETIF_F_RXCSUM)) {
602 if ((cqe->status & cpu_to_be16(MLX4_CQE_STATUS_IPOK)) &&
603 (cqe->checksum == cpu_to_be16(0xffff))) {
605 /* This packet is eligible for LRO if it is:
606 * - DIX Ethernet (type interpretation)
608 * - without IP options
609 * - not an IP fragment */
610 if (dev->features & NETIF_F_GRO) {
611 struct sk_buff *gro_skb = napi_get_frags(&cq->napi);
615 nr = mlx4_en_complete_rx_desc(
618 ring->page_alloc, length);
622 skb_shinfo(gro_skb)->nr_frags = nr;
623 gro_skb->len = length;
624 gro_skb->data_len = length;
625 gro_skb->ip_summed = CHECKSUM_UNNECESSARY;
627 if (cqe->vlan_my_qpn &
628 cpu_to_be32(MLX4_CQE_VLAN_PRESENT_MASK)) {
629 u16 vid = be16_to_cpu(cqe->sl_vid);
631 __vlan_hwaccel_put_tag(gro_skb, vid);
634 if (dev->features & NETIF_F_RXHASH)
635 gro_skb->rxhash = be32_to_cpu(cqe->immed_rss_invalid);
637 skb_record_rx_queue(gro_skb, cq->ring);
638 napi_gro_frags(&cq->napi);
643 /* LRO not possible, complete processing here */
644 ip_summed = CHECKSUM_UNNECESSARY;
646 ip_summed = CHECKSUM_NONE;
650 ip_summed = CHECKSUM_NONE;
654 skb = mlx4_en_rx_skb(priv, rx_desc, skb_frags,
655 ring->page_alloc, length);
657 priv->stats.rx_dropped++;
661 if (unlikely(priv->validate_loopback)) {
662 validate_loopback(priv, skb);
666 skb->ip_summed = ip_summed;
667 skb->protocol = eth_type_trans(skb, dev);
668 skb_record_rx_queue(skb, cq->ring);
670 if (dev->features & NETIF_F_RXHASH)
671 skb->rxhash = be32_to_cpu(cqe->immed_rss_invalid);
673 if (be32_to_cpu(cqe->vlan_my_qpn) &
674 MLX4_CQE_VLAN_PRESENT_MASK)
675 __vlan_hwaccel_put_tag(skb, be16_to_cpu(cqe->sl_vid));
677 /* Push it up the stack */
678 netif_receive_skb(skb);
681 ++cq->mcq.cons_index;
682 index = (cq->mcq.cons_index) & ring->size_mask;
683 cqe = &cq->buf[index];
684 if (++polled == budget) {
685 /* We are here because we reached the NAPI budget -
686 * flush only pending LRO sessions */
692 AVG_PERF_COUNTER(priv->pstats.rx_coal_avg, polled);
693 mlx4_cq_set_ci(&cq->mcq);
694 wmb(); /* ensure HW sees CQ consumer before we post new buffers */
695 ring->cons = cq->mcq.cons_index;
696 ring->prod += polled; /* Polled descriptors were realocated in place */
697 mlx4_en_update_rx_prod_db(ring);
702 void mlx4_en_rx_irq(struct mlx4_cq *mcq)
704 struct mlx4_en_cq *cq = container_of(mcq, struct mlx4_en_cq, mcq);
705 struct mlx4_en_priv *priv = netdev_priv(cq->dev);
708 napi_schedule(&cq->napi);
710 mlx4_en_arm_cq(priv, cq);
713 /* Rx CQ polling - called by NAPI */
714 int mlx4_en_poll_rx_cq(struct napi_struct *napi, int budget)
716 struct mlx4_en_cq *cq = container_of(napi, struct mlx4_en_cq, napi);
717 struct net_device *dev = cq->dev;
718 struct mlx4_en_priv *priv = netdev_priv(dev);
721 done = mlx4_en_process_rx_cq(dev, cq, budget);
723 /* If we used up all the quota - we're probably not done yet... */
725 INC_PERF_COUNTER(priv->pstats.napi_quota);
729 mlx4_en_arm_cq(priv, cq);
735 /* Calculate the last offset position that accommodates a full fragment
736 * (assuming fagment size = stride-align) */
737 static int mlx4_en_last_alloc_offset(struct mlx4_en_priv *priv, u16 stride, u16 align)
739 u16 res = MLX4_EN_ALLOC_SIZE % stride;
740 u16 offset = MLX4_EN_ALLOC_SIZE - stride - res + align;
742 en_dbg(DRV, priv, "Calculated last offset for stride:%d align:%d "
743 "res:%d offset:%d\n", stride, align, res, offset);
748 static int frag_sizes[] = {
755 void mlx4_en_calc_rx_buf(struct net_device *dev)
757 struct mlx4_en_priv *priv = netdev_priv(dev);
758 int eff_mtu = dev->mtu + ETH_HLEN + VLAN_HLEN + ETH_LLC_SNAP_SIZE;
762 while (buf_size < eff_mtu) {
763 priv->frag_info[i].frag_size =
764 (eff_mtu > buf_size + frag_sizes[i]) ?
765 frag_sizes[i] : eff_mtu - buf_size;
766 priv->frag_info[i].frag_prefix_size = buf_size;
768 priv->frag_info[i].frag_align = NET_IP_ALIGN;
769 priv->frag_info[i].frag_stride =
770 ALIGN(frag_sizes[i] + NET_IP_ALIGN, SMP_CACHE_BYTES);
772 priv->frag_info[i].frag_align = 0;
773 priv->frag_info[i].frag_stride =
774 ALIGN(frag_sizes[i], SMP_CACHE_BYTES);
776 priv->frag_info[i].last_offset = mlx4_en_last_alloc_offset(
777 priv, priv->frag_info[i].frag_stride,
778 priv->frag_info[i].frag_align);
779 buf_size += priv->frag_info[i].frag_size;
784 priv->rx_skb_size = eff_mtu;
785 priv->log_rx_info = ROUNDUP_LOG2(i * sizeof(struct skb_frag_struct));
787 en_dbg(DRV, priv, "Rx buffer scatter-list (effective-mtu:%d "
788 "num_frags:%d):\n", eff_mtu, priv->num_frags);
789 for (i = 0; i < priv->num_frags; i++) {
790 en_dbg(DRV, priv, " frag:%d - size:%d prefix:%d align:%d "
791 "stride:%d last_offset:%d\n", i,
792 priv->frag_info[i].frag_size,
793 priv->frag_info[i].frag_prefix_size,
794 priv->frag_info[i].frag_align,
795 priv->frag_info[i].frag_stride,
796 priv->frag_info[i].last_offset);
800 /* RSS related functions */
802 static int mlx4_en_config_rss_qp(struct mlx4_en_priv *priv, int qpn,
803 struct mlx4_en_rx_ring *ring,
804 enum mlx4_qp_state *state,
807 struct mlx4_en_dev *mdev = priv->mdev;
808 struct mlx4_qp_context *context;
811 context = kmalloc(sizeof *context , GFP_KERNEL);
813 en_err(priv, "Failed to allocate qp context\n");
817 err = mlx4_qp_alloc(mdev->dev, qpn, qp);
819 en_err(priv, "Failed to allocate qp #%x\n", qpn);
822 qp->event = mlx4_en_sqp_event;
824 memset(context, 0, sizeof *context);
825 mlx4_en_fill_qp_context(priv, ring->actual_size, ring->stride, 0, 0,
826 qpn, ring->cqn, context);
827 context->db_rec_addr = cpu_to_be64(ring->wqres.db.dma);
829 /* Cancel FCS removal if FW allows */
830 if (mdev->dev->caps.flags & MLX4_DEV_CAP_FLAG_FCS_KEEP) {
831 context->param3 |= cpu_to_be32(1 << 29);
832 ring->fcs_del = ETH_FCS_LEN;
836 err = mlx4_qp_to_ready(mdev->dev, &ring->wqres.mtt, context, qp, state);
838 mlx4_qp_remove(mdev->dev, qp);
839 mlx4_qp_free(mdev->dev, qp);
841 mlx4_en_update_rx_prod_db(ring);
847 /* Allocate rx qp's and configure them according to rss map */
848 int mlx4_en_config_rss_steer(struct mlx4_en_priv *priv)
850 struct mlx4_en_dev *mdev = priv->mdev;
851 struct mlx4_en_rss_map *rss_map = &priv->rss_map;
852 struct mlx4_qp_context context;
853 struct mlx4_rss_context *rss_context;
856 u8 rss_mask = (MLX4_RSS_IPV4 | MLX4_RSS_TCP_IPV4 | MLX4_RSS_IPV6 |
861 static const u32 rsskey[10] = { 0xD181C62C, 0xF7F4DB5B, 0x1983A2FC,
862 0x943E1ADB, 0xD9389E6B, 0xD1039C2C, 0xA74499AD,
863 0x593D56D9, 0xF3253C06, 0x2ADC1FFC};
865 en_dbg(DRV, priv, "Configuring rss steering\n");
866 err = mlx4_qp_reserve_range(mdev->dev, priv->rx_ring_num,
870 en_err(priv, "Failed reserving %d qps\n", priv->rx_ring_num);
874 for (i = 0; i < priv->rx_ring_num; i++) {
875 qpn = rss_map->base_qpn + i;
876 err = mlx4_en_config_rss_qp(priv, qpn, &priv->rx_ring[i],
885 /* Configure RSS indirection qp */
886 err = mlx4_qp_alloc(mdev->dev, priv->base_qpn, &rss_map->indir_qp);
888 en_err(priv, "Failed to allocate RSS indirection QP\n");
891 rss_map->indir_qp.event = mlx4_en_sqp_event;
892 mlx4_en_fill_qp_context(priv, 0, 0, 0, 1, priv->base_qpn,
893 priv->rx_ring[0].cqn, &context);
895 if (!priv->prof->rss_rings || priv->prof->rss_rings > priv->rx_ring_num)
896 rss_rings = priv->rx_ring_num;
898 rss_rings = priv->prof->rss_rings;
900 ptr = ((void *) &context) + offsetof(struct mlx4_qp_context, pri_path)
901 + MLX4_RSS_OFFSET_IN_QPC_PRI_PATH;
903 rss_context->base_qpn = cpu_to_be32(ilog2(rss_rings) << 24 |
904 (rss_map->base_qpn));
905 rss_context->default_qpn = cpu_to_be32(rss_map->base_qpn);
906 if (priv->mdev->profile.udp_rss) {
907 rss_mask |= MLX4_RSS_UDP_IPV4 | MLX4_RSS_UDP_IPV6;
908 rss_context->base_qpn_udp = rss_context->default_qpn;
910 rss_context->flags = rss_mask;
911 rss_context->hash_fn = MLX4_RSS_HASH_TOP;
912 for (i = 0; i < 10; i++)
913 rss_context->rss_key[i] = rsskey[i];
915 err = mlx4_qp_to_ready(mdev->dev, &priv->res.mtt, &context,
916 &rss_map->indir_qp, &rss_map->indir_state);
923 mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
924 MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->indir_qp);
925 mlx4_qp_remove(mdev->dev, &rss_map->indir_qp);
926 mlx4_qp_free(mdev->dev, &rss_map->indir_qp);
928 for (i = 0; i < good_qps; i++) {
929 mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i],
930 MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->qps[i]);
931 mlx4_qp_remove(mdev->dev, &rss_map->qps[i]);
932 mlx4_qp_free(mdev->dev, &rss_map->qps[i]);
934 mlx4_qp_release_range(mdev->dev, rss_map->base_qpn, priv->rx_ring_num);
938 void mlx4_en_release_rss_steer(struct mlx4_en_priv *priv)
940 struct mlx4_en_dev *mdev = priv->mdev;
941 struct mlx4_en_rss_map *rss_map = &priv->rss_map;
944 mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
945 MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->indir_qp);
946 mlx4_qp_remove(mdev->dev, &rss_map->indir_qp);
947 mlx4_qp_free(mdev->dev, &rss_map->indir_qp);
949 for (i = 0; i < priv->rx_ring_num; i++) {
950 mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i],
951 MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->qps[i]);
952 mlx4_qp_remove(mdev->dev, &rss_map->qps[i]);
953 mlx4_qp_free(mdev->dev, &rss_map->qps[i]);
955 mlx4_qp_release_range(mdev->dev, rss_map->base_qpn, priv->rx_ring_num);