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>
44 static int mlx4_en_alloc_frags(struct mlx4_en_priv *priv,
45 struct mlx4_en_rx_desc *rx_desc,
46 struct mlx4_en_rx_alloc *frags,
47 struct mlx4_en_rx_alloc *ring_alloc)
49 struct mlx4_en_rx_alloc page_alloc[MLX4_EN_MAX_RX_FRAGS];
50 struct mlx4_en_frag_info *frag_info;
55 for (i = 0; i < priv->num_frags; i++) {
56 frag_info = &priv->frag_info[i];
57 if (ring_alloc[i].offset == frag_info->last_offset) {
58 page = alloc_pages(GFP_ATOMIC | __GFP_COMP,
62 dma = dma_map_page(priv->ddev, page, 0,
63 MLX4_EN_ALLOC_SIZE, PCI_DMA_FROMDEVICE);
64 if (dma_mapping_error(priv->ddev, dma)) {
68 page_alloc[i].page = page;
69 page_alloc[i].dma = dma;
70 page_alloc[i].offset = frag_info->frag_align;
72 page_alloc[i].page = ring_alloc[i].page;
73 get_page(ring_alloc[i].page);
74 page_alloc[i].dma = ring_alloc[i].dma;
75 page_alloc[i].offset = ring_alloc[i].offset +
76 frag_info->frag_stride;
80 for (i = 0; i < priv->num_frags; i++) {
81 frags[i] = ring_alloc[i];
82 dma = ring_alloc[i].dma + ring_alloc[i].offset;
83 ring_alloc[i] = page_alloc[i];
84 rx_desc->data[i].addr = cpu_to_be64(dma);
92 frag_info = &priv->frag_info[i];
93 if (ring_alloc[i].offset == frag_info->last_offset)
94 dma_unmap_page(priv->ddev, page_alloc[i].dma,
95 MLX4_EN_ALLOC_SIZE, PCI_DMA_FROMDEVICE);
96 put_page(page_alloc[i].page);
101 static void mlx4_en_free_frag(struct mlx4_en_priv *priv,
102 struct mlx4_en_rx_alloc *frags,
105 struct mlx4_en_frag_info *frag_info = &priv->frag_info[i];
107 if (frags[i].offset == frag_info->last_offset) {
108 dma_unmap_page(priv->ddev, frags[i].dma, MLX4_EN_ALLOC_SIZE,
112 put_page(frags[i].page);
115 static int mlx4_en_init_allocator(struct mlx4_en_priv *priv,
116 struct mlx4_en_rx_ring *ring)
118 struct mlx4_en_rx_alloc *page_alloc;
121 for (i = 0; i < priv->num_frags; i++) {
122 page_alloc = &ring->page_alloc[i];
123 page_alloc->page = alloc_pages(GFP_ATOMIC | __GFP_COMP,
124 MLX4_EN_ALLOC_ORDER);
125 if (!page_alloc->page)
128 page_alloc->dma = dma_map_page(priv->ddev, page_alloc->page, 0,
129 MLX4_EN_ALLOC_SIZE, PCI_DMA_FROMDEVICE);
130 if (dma_mapping_error(priv->ddev, page_alloc->dma)) {
131 put_page(page_alloc->page);
132 page_alloc->page = NULL;
135 page_alloc->offset = priv->frag_info[i].frag_align;
136 en_dbg(DRV, priv, "Initialized allocator:%d with page:%p\n",
137 i, page_alloc->page);
143 page_alloc = &ring->page_alloc[i];
144 dma_unmap_page(priv->ddev, page_alloc->dma,
145 MLX4_EN_ALLOC_SIZE, PCI_DMA_FROMDEVICE);
146 put_page(page_alloc->page);
147 page_alloc->page = NULL;
152 static void mlx4_en_destroy_allocator(struct mlx4_en_priv *priv,
153 struct mlx4_en_rx_ring *ring)
155 struct mlx4_en_rx_alloc *page_alloc;
158 for (i = 0; i < priv->num_frags; i++) {
159 page_alloc = &ring->page_alloc[i];
160 en_dbg(DRV, priv, "Freeing allocator:%d count:%d\n",
161 i, page_count(page_alloc->page));
163 dma_unmap_page(priv->ddev, page_alloc->dma,
164 MLX4_EN_ALLOC_SIZE, PCI_DMA_FROMDEVICE);
165 put_page(page_alloc->page);
166 page_alloc->page = NULL;
170 static void mlx4_en_init_rx_desc(struct mlx4_en_priv *priv,
171 struct mlx4_en_rx_ring *ring, int index)
173 struct mlx4_en_rx_desc *rx_desc = ring->buf + ring->stride * index;
177 /* Set size and memtype fields */
178 for (i = 0; i < priv->num_frags; i++) {
179 rx_desc->data[i].byte_count =
180 cpu_to_be32(priv->frag_info[i].frag_size);
181 rx_desc->data[i].lkey = cpu_to_be32(priv->mdev->mr.key);
184 /* If the number of used fragments does not fill up the ring stride,
185 * remaining (unused) fragments must be padded with null address/size
186 * and a special memory key */
187 possible_frags = (ring->stride - sizeof(struct mlx4_en_rx_desc)) / DS_SIZE;
188 for (i = priv->num_frags; i < possible_frags; i++) {
189 rx_desc->data[i].byte_count = 0;
190 rx_desc->data[i].lkey = cpu_to_be32(MLX4_EN_MEMTYPE_PAD);
191 rx_desc->data[i].addr = 0;
195 static int mlx4_en_prepare_rx_desc(struct mlx4_en_priv *priv,
196 struct mlx4_en_rx_ring *ring, int index)
198 struct mlx4_en_rx_desc *rx_desc = ring->buf + (index * ring->stride);
199 struct mlx4_en_rx_alloc *frags = ring->rx_info +
200 (index << priv->log_rx_info);
202 return mlx4_en_alloc_frags(priv, rx_desc, frags, ring->page_alloc);
205 static inline void mlx4_en_update_rx_prod_db(struct mlx4_en_rx_ring *ring)
207 *ring->wqres.db.db = cpu_to_be32(ring->prod & 0xffff);
210 static void mlx4_en_free_rx_desc(struct mlx4_en_priv *priv,
211 struct mlx4_en_rx_ring *ring,
214 struct mlx4_en_rx_alloc *frags;
217 frags = ring->rx_info + (index << priv->log_rx_info);
218 for (nr = 0; nr < priv->num_frags; nr++) {
219 en_dbg(DRV, priv, "Freeing fragment:%d\n", nr);
220 mlx4_en_free_frag(priv, frags, nr);
224 static int mlx4_en_fill_rx_buffers(struct mlx4_en_priv *priv)
226 struct mlx4_en_rx_ring *ring;
231 for (buf_ind = 0; buf_ind < priv->prof->rx_ring_size; buf_ind++) {
232 for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
233 ring = &priv->rx_ring[ring_ind];
235 if (mlx4_en_prepare_rx_desc(priv, ring,
236 ring->actual_size)) {
237 if (ring->actual_size < MLX4_EN_MIN_RX_SIZE) {
238 en_err(priv, "Failed to allocate "
239 "enough rx buffers\n");
242 new_size = rounddown_pow_of_two(ring->actual_size);
243 en_warn(priv, "Only %d buffers allocated "
244 "reducing ring size to %d",
245 ring->actual_size, new_size);
256 for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
257 ring = &priv->rx_ring[ring_ind];
258 while (ring->actual_size > new_size) {
261 mlx4_en_free_rx_desc(priv, ring, ring->actual_size);
268 static void mlx4_en_free_rx_buf(struct mlx4_en_priv *priv,
269 struct mlx4_en_rx_ring *ring)
273 en_dbg(DRV, priv, "Freeing Rx buf - cons:%d prod:%d\n",
274 ring->cons, ring->prod);
276 /* Unmap and free Rx buffers */
277 BUG_ON((u32) (ring->prod - ring->cons) > ring->actual_size);
278 while (ring->cons != ring->prod) {
279 index = ring->cons & ring->size_mask;
280 en_dbg(DRV, priv, "Processing descriptor:%d\n", index);
281 mlx4_en_free_rx_desc(priv, ring, index);
286 int mlx4_en_create_rx_ring(struct mlx4_en_priv *priv,
287 struct mlx4_en_rx_ring *ring, u32 size, u16 stride)
289 struct mlx4_en_dev *mdev = priv->mdev;
296 ring->size_mask = size - 1;
297 ring->stride = stride;
298 ring->log_stride = ffs(ring->stride) - 1;
299 ring->buf_size = ring->size * ring->stride + TXBB_SIZE;
301 tmp = size * roundup_pow_of_two(MLX4_EN_MAX_RX_FRAGS *
302 sizeof(struct mlx4_en_rx_alloc));
303 ring->rx_info = vmalloc(tmp);
307 en_dbg(DRV, priv, "Allocated rx_info ring at addr:%p size:%d\n",
310 err = mlx4_alloc_hwq_res(mdev->dev, &ring->wqres,
311 ring->buf_size, 2 * PAGE_SIZE);
315 err = mlx4_en_map_buffer(&ring->wqres.buf);
317 en_err(priv, "Failed to map RX buffer\n");
320 ring->buf = ring->wqres.buf.direct.buf;
325 mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size);
327 vfree(ring->rx_info);
328 ring->rx_info = NULL;
332 int mlx4_en_activate_rx_rings(struct mlx4_en_priv *priv)
334 struct mlx4_en_rx_ring *ring;
338 int stride = roundup_pow_of_two(sizeof(struct mlx4_en_rx_desc) +
339 DS_SIZE * priv->num_frags);
341 for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
342 ring = &priv->rx_ring[ring_ind];
346 ring->actual_size = 0;
347 ring->cqn = priv->rx_cq[ring_ind].mcq.cqn;
349 ring->stride = stride;
350 if (ring->stride <= TXBB_SIZE)
351 ring->buf += TXBB_SIZE;
353 ring->log_stride = ffs(ring->stride) - 1;
354 ring->buf_size = ring->size * ring->stride;
356 memset(ring->buf, 0, ring->buf_size);
357 mlx4_en_update_rx_prod_db(ring);
359 /* Initialize all descriptors */
360 for (i = 0; i < ring->size; i++)
361 mlx4_en_init_rx_desc(priv, ring, i);
363 /* Initialize page allocators */
364 err = mlx4_en_init_allocator(priv, ring);
366 en_err(priv, "Failed initializing ring allocator\n");
367 if (ring->stride <= TXBB_SIZE)
368 ring->buf -= TXBB_SIZE;
373 err = mlx4_en_fill_rx_buffers(priv);
377 for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
378 ring = &priv->rx_ring[ring_ind];
380 ring->size_mask = ring->actual_size - 1;
381 mlx4_en_update_rx_prod_db(ring);
387 for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++)
388 mlx4_en_free_rx_buf(priv, &priv->rx_ring[ring_ind]);
390 ring_ind = priv->rx_ring_num - 1;
392 while (ring_ind >= 0) {
393 if (priv->rx_ring[ring_ind].stride <= TXBB_SIZE)
394 priv->rx_ring[ring_ind].buf -= TXBB_SIZE;
395 mlx4_en_destroy_allocator(priv, &priv->rx_ring[ring_ind]);
401 void mlx4_en_destroy_rx_ring(struct mlx4_en_priv *priv,
402 struct mlx4_en_rx_ring *ring, u32 size, u16 stride)
404 struct mlx4_en_dev *mdev = priv->mdev;
406 mlx4_en_unmap_buffer(&ring->wqres.buf);
407 mlx4_free_hwq_res(mdev->dev, &ring->wqres, size * stride + TXBB_SIZE);
408 vfree(ring->rx_info);
409 ring->rx_info = NULL;
410 #ifdef CONFIG_RFS_ACCEL
411 mlx4_en_cleanup_filters(priv, ring);
415 void mlx4_en_deactivate_rx_ring(struct mlx4_en_priv *priv,
416 struct mlx4_en_rx_ring *ring)
418 mlx4_en_free_rx_buf(priv, ring);
419 if (ring->stride <= TXBB_SIZE)
420 ring->buf -= TXBB_SIZE;
421 mlx4_en_destroy_allocator(priv, ring);
425 static int mlx4_en_complete_rx_desc(struct mlx4_en_priv *priv,
426 struct mlx4_en_rx_desc *rx_desc,
427 struct mlx4_en_rx_alloc *frags,
431 struct skb_frag_struct *skb_frags_rx = skb_shinfo(skb)->frags;
432 struct mlx4_en_frag_info *frag_info;
436 /* Collect used fragments while replacing them in the HW descriptors */
437 for (nr = 0; nr < priv->num_frags; nr++) {
438 frag_info = &priv->frag_info[nr];
439 if (length <= frag_info->frag_prefix_size)
444 dma = be64_to_cpu(rx_desc->data[nr].addr);
445 dma_sync_single_for_cpu(priv->ddev, dma, frag_info->frag_size,
448 /* Save page reference in skb */
449 get_page(frags[nr].page);
450 __skb_frag_set_page(&skb_frags_rx[nr], frags[nr].page);
451 skb_frag_size_set(&skb_frags_rx[nr], frag_info->frag_size);
452 skb_frags_rx[nr].page_offset = frags[nr].offset;
453 skb->truesize += frag_info->frag_stride;
455 /* Adjust size of last fragment to match actual length */
457 skb_frag_size_set(&skb_frags_rx[nr - 1],
458 length - priv->frag_info[nr - 1].frag_prefix_size);
464 __skb_frag_unref(&skb_frags_rx[nr]);
470 static struct sk_buff *mlx4_en_rx_skb(struct mlx4_en_priv *priv,
471 struct mlx4_en_rx_desc *rx_desc,
472 struct mlx4_en_rx_alloc *frags,
480 skb = netdev_alloc_skb(priv->dev, SMALL_PACKET_SIZE + NET_IP_ALIGN);
482 en_dbg(RX_ERR, priv, "Failed allocating skb\n");
485 skb_reserve(skb, NET_IP_ALIGN);
488 /* Get pointer to first fragment so we could copy the headers into the
489 * (linear part of the) skb */
490 va = page_address(frags[0].page) + frags[0].offset;
492 if (length <= SMALL_PACKET_SIZE) {
493 /* We are copying all relevant data to the skb - temporarily
494 * sync buffers for the copy */
495 dma = be64_to_cpu(rx_desc->data[0].addr);
496 dma_sync_single_for_cpu(priv->ddev, dma, length,
498 skb_copy_to_linear_data(skb, va, length);
501 /* Move relevant fragments to skb */
502 used_frags = mlx4_en_complete_rx_desc(priv, rx_desc, frags,
504 if (unlikely(!used_frags)) {
508 skb_shinfo(skb)->nr_frags = used_frags;
510 /* Copy headers into the skb linear buffer */
511 memcpy(skb->data, va, HEADER_COPY_SIZE);
512 skb->tail += HEADER_COPY_SIZE;
514 /* Skip headers in first fragment */
515 skb_shinfo(skb)->frags[0].page_offset += HEADER_COPY_SIZE;
517 /* Adjust size of first fragment */
518 skb_frag_size_sub(&skb_shinfo(skb)->frags[0], HEADER_COPY_SIZE);
519 skb->data_len = length - HEADER_COPY_SIZE;
524 static void validate_loopback(struct mlx4_en_priv *priv, struct sk_buff *skb)
527 int offset = ETH_HLEN;
529 for (i = 0; i < MLX4_LOOPBACK_TEST_PAYLOAD; i++, offset++) {
530 if (*(skb->data + offset) != (unsigned char) (i & 0xff))
534 priv->loopback_ok = 1;
537 dev_kfree_skb_any(skb);
540 static void mlx4_en_refill_rx_buffers(struct mlx4_en_priv *priv,
541 struct mlx4_en_rx_ring *ring)
543 int index = ring->prod & ring->size_mask;
545 while ((u32) (ring->prod - ring->cons) < ring->actual_size) {
546 if (mlx4_en_prepare_rx_desc(priv, ring, index))
549 index = ring->prod & ring->size_mask;
553 int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int budget)
555 struct mlx4_en_priv *priv = netdev_priv(dev);
556 struct mlx4_cqe *cqe;
557 struct mlx4_en_rx_ring *ring = &priv->rx_ring[cq->ring];
558 struct mlx4_en_rx_alloc *frags;
559 struct mlx4_en_rx_desc *rx_desc;
569 int factor = priv->cqe_factor;
574 /* We assume a 1:1 mapping between CQEs and Rx descriptors, so Rx
575 * descriptor offset can be deduced from the CQE index instead of
576 * reading 'cqe->index' */
577 index = cq->mcq.cons_index & ring->size_mask;
578 cqe = &cq->buf[(index << factor) + factor];
580 /* Process all completed CQEs */
581 while (XNOR(cqe->owner_sr_opcode & MLX4_CQE_OWNER_MASK,
582 cq->mcq.cons_index & cq->size)) {
584 frags = ring->rx_info + (index << priv->log_rx_info);
585 rx_desc = ring->buf + (index << ring->log_stride);
588 * make sure we read the CQE after we read the ownership bit
592 /* Drop packet on bad receive or bad checksum */
593 if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) ==
594 MLX4_CQE_OPCODE_ERROR)) {
595 en_err(priv, "CQE completed in error - vendor "
596 "syndrom:%d syndrom:%d\n",
597 ((struct mlx4_err_cqe *) cqe)->vendor_err_syndrome,
598 ((struct mlx4_err_cqe *) cqe)->syndrome);
601 if (unlikely(cqe->badfcs_enc & MLX4_CQE_BAD_FCS)) {
602 en_dbg(RX_ERR, priv, "Accepted frame with bad FCS\n");
606 /* Get pointer to first fragment since we haven't skb yet and
607 * cast it to ethhdr struct */
608 dma = be64_to_cpu(rx_desc->data[0].addr);
609 dma_sync_single_for_cpu(priv->ddev, dma, sizeof(*ethh),
611 ethh = (struct ethhdr *)(page_address(frags[0].page) +
613 s_mac = mlx4_en_mac_to_u64(ethh->h_source);
615 /* If source MAC is equal to our own MAC and not performing
616 * the selftest or flb disabled - drop the packet */
617 if (s_mac == priv->mac &&
618 !((dev->features & NETIF_F_LOOPBACK) ||
619 priv->validate_loopback))
623 * Packet is OK - process it.
625 length = be32_to_cpu(cqe->byte_cnt);
626 length -= ring->fcs_del;
627 ring->bytes += length;
630 if (likely(dev->features & NETIF_F_RXCSUM)) {
631 if ((cqe->status & cpu_to_be16(MLX4_CQE_STATUS_IPOK)) &&
632 (cqe->checksum == cpu_to_be16(0xffff))) {
634 /* This packet is eligible for GRO if it is:
635 * - DIX Ethernet (type interpretation)
637 * - without IP options
638 * - not an IP fragment */
639 if (dev->features & NETIF_F_GRO) {
640 struct sk_buff *gro_skb = napi_get_frags(&cq->napi);
644 nr = mlx4_en_complete_rx_desc(priv,
645 rx_desc, frags, gro_skb,
650 skb_shinfo(gro_skb)->nr_frags = nr;
651 gro_skb->len = length;
652 gro_skb->data_len = length;
653 gro_skb->ip_summed = CHECKSUM_UNNECESSARY;
655 if (cqe->vlan_my_qpn &
656 cpu_to_be32(MLX4_CQE_VLAN_PRESENT_MASK)) {
657 u16 vid = be16_to_cpu(cqe->sl_vid);
659 __vlan_hwaccel_put_tag(gro_skb, vid);
662 if (dev->features & NETIF_F_RXHASH)
663 gro_skb->rxhash = be32_to_cpu(cqe->immed_rss_invalid);
665 skb_record_rx_queue(gro_skb, cq->ring);
666 napi_gro_frags(&cq->napi);
671 /* GRO not possible, complete processing here */
672 ip_summed = CHECKSUM_UNNECESSARY;
674 ip_summed = CHECKSUM_NONE;
678 ip_summed = CHECKSUM_NONE;
682 skb = mlx4_en_rx_skb(priv, rx_desc, frags, length);
684 priv->stats.rx_dropped++;
688 if (unlikely(priv->validate_loopback)) {
689 validate_loopback(priv, skb);
693 skb->ip_summed = ip_summed;
694 skb->protocol = eth_type_trans(skb, dev);
695 skb_record_rx_queue(skb, cq->ring);
697 if (dev->features & NETIF_F_RXHASH)
698 skb->rxhash = be32_to_cpu(cqe->immed_rss_invalid);
700 if (be32_to_cpu(cqe->vlan_my_qpn) &
701 MLX4_CQE_VLAN_PRESENT_MASK)
702 __vlan_hwaccel_put_tag(skb, be16_to_cpu(cqe->sl_vid));
704 /* Push it up the stack */
705 netif_receive_skb(skb);
708 for (nr = 0; nr < priv->num_frags; nr++)
709 mlx4_en_free_frag(priv, frags, nr);
711 ++cq->mcq.cons_index;
712 index = (cq->mcq.cons_index) & ring->size_mask;
713 cqe = &cq->buf[(index << factor) + factor];
714 if (++polled == budget)
719 AVG_PERF_COUNTER(priv->pstats.rx_coal_avg, polled);
720 mlx4_cq_set_ci(&cq->mcq);
721 wmb(); /* ensure HW sees CQ consumer before we post new buffers */
722 ring->cons = cq->mcq.cons_index;
723 mlx4_en_refill_rx_buffers(priv, ring);
724 mlx4_en_update_rx_prod_db(ring);
729 void mlx4_en_rx_irq(struct mlx4_cq *mcq)
731 struct mlx4_en_cq *cq = container_of(mcq, struct mlx4_en_cq, mcq);
732 struct mlx4_en_priv *priv = netdev_priv(cq->dev);
735 napi_schedule(&cq->napi);
737 mlx4_en_arm_cq(priv, cq);
740 /* Rx CQ polling - called by NAPI */
741 int mlx4_en_poll_rx_cq(struct napi_struct *napi, int budget)
743 struct mlx4_en_cq *cq = container_of(napi, struct mlx4_en_cq, napi);
744 struct net_device *dev = cq->dev;
745 struct mlx4_en_priv *priv = netdev_priv(dev);
748 done = mlx4_en_process_rx_cq(dev, cq, budget);
750 /* If we used up all the quota - we're probably not done yet... */
752 INC_PERF_COUNTER(priv->pstats.napi_quota);
756 mlx4_en_arm_cq(priv, cq);
762 /* Calculate the last offset position that accommodates a full fragment
763 * (assuming fagment size = stride-align) */
764 static int mlx4_en_last_alloc_offset(struct mlx4_en_priv *priv, u16 stride, u16 align)
766 u16 res = MLX4_EN_ALLOC_SIZE % stride;
767 u16 offset = MLX4_EN_ALLOC_SIZE - stride - res + align;
769 en_dbg(DRV, priv, "Calculated last offset for stride:%d align:%d "
770 "res:%d offset:%d\n", stride, align, res, offset);
775 static int frag_sizes[] = {
782 void mlx4_en_calc_rx_buf(struct net_device *dev)
784 struct mlx4_en_priv *priv = netdev_priv(dev);
785 int eff_mtu = dev->mtu + ETH_HLEN + VLAN_HLEN + ETH_LLC_SNAP_SIZE;
789 while (buf_size < eff_mtu) {
790 priv->frag_info[i].frag_size =
791 (eff_mtu > buf_size + frag_sizes[i]) ?
792 frag_sizes[i] : eff_mtu - buf_size;
793 priv->frag_info[i].frag_prefix_size = buf_size;
795 priv->frag_info[i].frag_align = NET_IP_ALIGN;
796 priv->frag_info[i].frag_stride =
797 ALIGN(frag_sizes[i] + NET_IP_ALIGN, SMP_CACHE_BYTES);
799 priv->frag_info[i].frag_align = 0;
800 priv->frag_info[i].frag_stride =
801 ALIGN(frag_sizes[i], SMP_CACHE_BYTES);
803 priv->frag_info[i].last_offset = mlx4_en_last_alloc_offset(
804 priv, priv->frag_info[i].frag_stride,
805 priv->frag_info[i].frag_align);
806 buf_size += priv->frag_info[i].frag_size;
811 priv->rx_skb_size = eff_mtu;
812 priv->log_rx_info = ROUNDUP_LOG2(i * sizeof(struct mlx4_en_rx_alloc));
814 en_dbg(DRV, priv, "Rx buffer scatter-list (effective-mtu:%d "
815 "num_frags:%d):\n", eff_mtu, priv->num_frags);
816 for (i = 0; i < priv->num_frags; i++) {
817 en_dbg(DRV, priv, " frag:%d - size:%d prefix:%d align:%d "
818 "stride:%d last_offset:%d\n", i,
819 priv->frag_info[i].frag_size,
820 priv->frag_info[i].frag_prefix_size,
821 priv->frag_info[i].frag_align,
822 priv->frag_info[i].frag_stride,
823 priv->frag_info[i].last_offset);
827 /* RSS related functions */
829 static int mlx4_en_config_rss_qp(struct mlx4_en_priv *priv, int qpn,
830 struct mlx4_en_rx_ring *ring,
831 enum mlx4_qp_state *state,
834 struct mlx4_en_dev *mdev = priv->mdev;
835 struct mlx4_qp_context *context;
838 context = kmalloc(sizeof *context , GFP_KERNEL);
840 en_err(priv, "Failed to allocate qp context\n");
844 err = mlx4_qp_alloc(mdev->dev, qpn, qp);
846 en_err(priv, "Failed to allocate qp #%x\n", qpn);
849 qp->event = mlx4_en_sqp_event;
851 memset(context, 0, sizeof *context);
852 mlx4_en_fill_qp_context(priv, ring->actual_size, ring->stride, 0, 0,
853 qpn, ring->cqn, -1, context);
854 context->db_rec_addr = cpu_to_be64(ring->wqres.db.dma);
856 /* Cancel FCS removal if FW allows */
857 if (mdev->dev->caps.flags & MLX4_DEV_CAP_FLAG_FCS_KEEP) {
858 context->param3 |= cpu_to_be32(1 << 29);
859 ring->fcs_del = ETH_FCS_LEN;
863 err = mlx4_qp_to_ready(mdev->dev, &ring->wqres.mtt, context, qp, state);
865 mlx4_qp_remove(mdev->dev, qp);
866 mlx4_qp_free(mdev->dev, qp);
868 mlx4_en_update_rx_prod_db(ring);
874 int mlx4_en_create_drop_qp(struct mlx4_en_priv *priv)
879 err = mlx4_qp_reserve_range(priv->mdev->dev, 1, 1, &qpn);
881 en_err(priv, "Failed reserving drop qpn\n");
884 err = mlx4_qp_alloc(priv->mdev->dev, qpn, &priv->drop_qp);
886 en_err(priv, "Failed allocating drop qp\n");
887 mlx4_qp_release_range(priv->mdev->dev, qpn, 1);
894 void mlx4_en_destroy_drop_qp(struct mlx4_en_priv *priv)
898 qpn = priv->drop_qp.qpn;
899 mlx4_qp_remove(priv->mdev->dev, &priv->drop_qp);
900 mlx4_qp_free(priv->mdev->dev, &priv->drop_qp);
901 mlx4_qp_release_range(priv->mdev->dev, qpn, 1);
904 /* Allocate rx qp's and configure them according to rss map */
905 int mlx4_en_config_rss_steer(struct mlx4_en_priv *priv)
907 struct mlx4_en_dev *mdev = priv->mdev;
908 struct mlx4_en_rss_map *rss_map = &priv->rss_map;
909 struct mlx4_qp_context context;
910 struct mlx4_rss_context *rss_context;
913 u8 rss_mask = (MLX4_RSS_IPV4 | MLX4_RSS_TCP_IPV4 | MLX4_RSS_IPV6 |
918 static const u32 rsskey[10] = { 0xD181C62C, 0xF7F4DB5B, 0x1983A2FC,
919 0x943E1ADB, 0xD9389E6B, 0xD1039C2C, 0xA74499AD,
920 0x593D56D9, 0xF3253C06, 0x2ADC1FFC};
922 en_dbg(DRV, priv, "Configuring rss steering\n");
923 err = mlx4_qp_reserve_range(mdev->dev, priv->rx_ring_num,
927 en_err(priv, "Failed reserving %d qps\n", priv->rx_ring_num);
931 for (i = 0; i < priv->rx_ring_num; i++) {
932 qpn = rss_map->base_qpn + i;
933 err = mlx4_en_config_rss_qp(priv, qpn, &priv->rx_ring[i],
942 /* Configure RSS indirection qp */
943 err = mlx4_qp_alloc(mdev->dev, priv->base_qpn, &rss_map->indir_qp);
945 en_err(priv, "Failed to allocate RSS indirection QP\n");
948 rss_map->indir_qp.event = mlx4_en_sqp_event;
949 mlx4_en_fill_qp_context(priv, 0, 0, 0, 1, priv->base_qpn,
950 priv->rx_ring[0].cqn, -1, &context);
952 if (!priv->prof->rss_rings || priv->prof->rss_rings > priv->rx_ring_num)
953 rss_rings = priv->rx_ring_num;
955 rss_rings = priv->prof->rss_rings;
957 ptr = ((void *) &context) + offsetof(struct mlx4_qp_context, pri_path)
958 + MLX4_RSS_OFFSET_IN_QPC_PRI_PATH;
960 rss_context->base_qpn = cpu_to_be32(ilog2(rss_rings) << 24 |
961 (rss_map->base_qpn));
962 rss_context->default_qpn = cpu_to_be32(rss_map->base_qpn);
963 if (priv->mdev->profile.udp_rss) {
964 rss_mask |= MLX4_RSS_UDP_IPV4 | MLX4_RSS_UDP_IPV6;
965 rss_context->base_qpn_udp = rss_context->default_qpn;
967 rss_context->flags = rss_mask;
968 rss_context->hash_fn = MLX4_RSS_HASH_TOP;
969 for (i = 0; i < 10; i++)
970 rss_context->rss_key[i] = cpu_to_be32(rsskey[i]);
972 err = mlx4_qp_to_ready(mdev->dev, &priv->res.mtt, &context,
973 &rss_map->indir_qp, &rss_map->indir_state);
980 mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
981 MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->indir_qp);
982 mlx4_qp_remove(mdev->dev, &rss_map->indir_qp);
983 mlx4_qp_free(mdev->dev, &rss_map->indir_qp);
985 for (i = 0; i < good_qps; i++) {
986 mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i],
987 MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->qps[i]);
988 mlx4_qp_remove(mdev->dev, &rss_map->qps[i]);
989 mlx4_qp_free(mdev->dev, &rss_map->qps[i]);
991 mlx4_qp_release_range(mdev->dev, rss_map->base_qpn, priv->rx_ring_num);
995 void mlx4_en_release_rss_steer(struct mlx4_en_priv *priv)
997 struct mlx4_en_dev *mdev = priv->mdev;
998 struct mlx4_en_rss_map *rss_map = &priv->rss_map;
1001 mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
1002 MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->indir_qp);
1003 mlx4_qp_remove(mdev->dev, &rss_map->indir_qp);
1004 mlx4_qp_free(mdev->dev, &rss_map->indir_qp);
1006 for (i = 0; i < priv->rx_ring_num; i++) {
1007 mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i],
1008 MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->qps[i]);
1009 mlx4_qp_remove(mdev->dev, &rss_map->qps[i]);
1010 mlx4_qp_free(mdev->dev, &rss_map->qps[i]);
1012 mlx4_qp_release_range(mdev->dev, rss_map->base_qpn, priv->rx_ring_num);