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{NET,IB}/mlx4: Add rmap support to mlx4_assign_eq
[deliverable/linux.git] / drivers / net / ethernet / mellanox / mlx4 / en_rx.c
1 /*
2 * Copyright (c) 2007 Mellanox Technologies. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 *
32 */
33
34 #include <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>
41
42 #include "mlx4_en.h"
43
44
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,
49 int i)
50 {
51 struct mlx4_en_frag_info *frag_info = &priv->frag_info[i];
52 struct mlx4_en_rx_alloc *page_alloc = &ring_alloc[i];
53 struct page *page;
54 dma_addr_t dma;
55
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);
59 if (!page)
60 return -ENOMEM;
61
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;
66 } else {
67 page = page_alloc->page;
68 get_page(page);
69
70 skb_frags[i].page = page;
71 skb_frags[i].offset = page_alloc->offset;
72 page_alloc->offset += frag_info->frag_stride;
73 }
74 dma = dma_map_single(priv->ddev, page_address(skb_frags[i].page) +
75 skb_frags[i].offset, frag_info->frag_size,
76 PCI_DMA_FROMDEVICE);
77 rx_desc->data[i].addr = cpu_to_be64(dma);
78 return 0;
79 }
80
81 static int mlx4_en_init_allocator(struct mlx4_en_priv *priv,
82 struct mlx4_en_rx_ring *ring)
83 {
84 struct mlx4_en_rx_alloc *page_alloc;
85 int i;
86
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,
90 MLX4_EN_ALLOC_ORDER);
91 if (!page_alloc->page)
92 goto out;
93
94 page_alloc->offset = priv->frag_info[i].frag_align;
95 en_dbg(DRV, priv, "Initialized allocator:%d with page:%p\n",
96 i, page_alloc->page);
97 }
98 return 0;
99
100 out:
101 while (i--) {
102 page_alloc = &ring->page_alloc[i];
103 put_page(page_alloc->page);
104 page_alloc->page = NULL;
105 }
106 return -ENOMEM;
107 }
108
109 static void mlx4_en_destroy_allocator(struct mlx4_en_priv *priv,
110 struct mlx4_en_rx_ring *ring)
111 {
112 struct mlx4_en_rx_alloc *page_alloc;
113 int i;
114
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));
119
120 put_page(page_alloc->page);
121 page_alloc->page = NULL;
122 }
123 }
124
125
126 static void mlx4_en_init_rx_desc(struct mlx4_en_priv *priv,
127 struct mlx4_en_rx_ring *ring, int index)
128 {
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);
132 int possible_frags;
133 int i;
134
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);
141 }
142
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;
151 }
152 }
153
154
155 static int mlx4_en_prepare_rx_desc(struct mlx4_en_priv *priv,
156 struct mlx4_en_rx_ring *ring, int index)
157 {
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);
161 int i;
162
163 for (i = 0; i < priv->num_frags; i++)
164 if (mlx4_en_alloc_frag(priv, rx_desc, skb_frags, ring->page_alloc, i))
165 goto err;
166
167 return 0;
168
169 err:
170 while (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,
173 PCI_DMA_FROMDEVICE);
174 put_page(skb_frags[i].page);
175 }
176 return -ENOMEM;
177 }
178
179 static inline void mlx4_en_update_rx_prod_db(struct mlx4_en_rx_ring *ring)
180 {
181 *ring->wqres.db.db = cpu_to_be32(ring->prod & 0xffff);
182 }
183
184 static void mlx4_en_free_rx_desc(struct mlx4_en_priv *priv,
185 struct mlx4_en_rx_ring *ring,
186 int index)
187 {
188 struct page_frag *skb_frags;
189 struct mlx4_en_rx_desc *rx_desc = ring->buf + (index << ring->log_stride);
190 dma_addr_t dma;
191 int nr;
192
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);
197
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,
200 PCI_DMA_FROMDEVICE);
201 put_page(skb_frags[nr].page);
202 }
203 }
204
205 static int mlx4_en_fill_rx_buffers(struct mlx4_en_priv *priv)
206 {
207 struct mlx4_en_rx_ring *ring;
208 int ring_ind;
209 int buf_ind;
210 int new_size;
211
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];
215
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");
221 return -ENOMEM;
222 } else {
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);
227 goto reduce_rings;
228 }
229 }
230 ring->actual_size++;
231 ring->prod++;
232 }
233 }
234 return 0;
235
236 reduce_rings:
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) {
240 ring->actual_size--;
241 ring->prod--;
242 mlx4_en_free_rx_desc(priv, ring, ring->actual_size);
243 }
244 }
245
246 return 0;
247 }
248
249 static void mlx4_en_free_rx_buf(struct mlx4_en_priv *priv,
250 struct mlx4_en_rx_ring *ring)
251 {
252 int index;
253
254 en_dbg(DRV, priv, "Freeing Rx buf - cons:%d prod:%d\n",
255 ring->cons, ring->prod);
256
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);
263 ++ring->cons;
264 }
265 }
266
267 int mlx4_en_create_rx_ring(struct mlx4_en_priv *priv,
268 struct mlx4_en_rx_ring *ring, u32 size, u16 stride)
269 {
270 struct mlx4_en_dev *mdev = priv->mdev;
271 int err;
272 int tmp;
273
274
275 ring->prod = 0;
276 ring->cons = 0;
277 ring->size = size;
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;
282
283 tmp = size * roundup_pow_of_two(MLX4_EN_MAX_RX_FRAGS *
284 sizeof(struct skb_frag_struct));
285 ring->rx_info = vmalloc(tmp);
286 if (!ring->rx_info)
287 return -ENOMEM;
288
289 en_dbg(DRV, priv, "Allocated rx_info ring at addr:%p size:%d\n",
290 ring->rx_info, tmp);
291
292 err = mlx4_alloc_hwq_res(mdev->dev, &ring->wqres,
293 ring->buf_size, 2 * PAGE_SIZE);
294 if (err)
295 goto err_ring;
296
297 err = mlx4_en_map_buffer(&ring->wqres.buf);
298 if (err) {
299 en_err(priv, "Failed to map RX buffer\n");
300 goto err_hwq;
301 }
302 ring->buf = ring->wqres.buf.direct.buf;
303
304 return 0;
305
306 err_hwq:
307 mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size);
308 err_ring:
309 vfree(ring->rx_info);
310 ring->rx_info = NULL;
311 return err;
312 }
313
314 int mlx4_en_activate_rx_rings(struct mlx4_en_priv *priv)
315 {
316 struct mlx4_en_rx_ring *ring;
317 int i;
318 int ring_ind;
319 int err;
320 int stride = roundup_pow_of_two(sizeof(struct mlx4_en_rx_desc) +
321 DS_SIZE * priv->num_frags);
322
323 for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
324 ring = &priv->rx_ring[ring_ind];
325
326 ring->prod = 0;
327 ring->cons = 0;
328 ring->actual_size = 0;
329 ring->cqn = priv->rx_cq[ring_ind].mcq.cqn;
330
331 ring->stride = stride;
332 if (ring->stride <= TXBB_SIZE)
333 ring->buf += TXBB_SIZE;
334
335 ring->log_stride = ffs(ring->stride) - 1;
336 ring->buf_size = ring->size * ring->stride;
337
338 memset(ring->buf, 0, ring->buf_size);
339 mlx4_en_update_rx_prod_db(ring);
340
341 /* Initailize all descriptors */
342 for (i = 0; i < ring->size; i++)
343 mlx4_en_init_rx_desc(priv, ring, i);
344
345 /* Initialize page allocators */
346 err = mlx4_en_init_allocator(priv, ring);
347 if (err) {
348 en_err(priv, "Failed initializing ring allocator\n");
349 if (ring->stride <= TXBB_SIZE)
350 ring->buf -= TXBB_SIZE;
351 ring_ind--;
352 goto err_allocator;
353 }
354 }
355 err = mlx4_en_fill_rx_buffers(priv);
356 if (err)
357 goto err_buffers;
358
359 for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
360 ring = &priv->rx_ring[ring_ind];
361
362 ring->size_mask = ring->actual_size - 1;
363 mlx4_en_update_rx_prod_db(ring);
364 }
365
366 return 0;
367
368 err_buffers:
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]);
371
372 ring_ind = priv->rx_ring_num - 1;
373 err_allocator:
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]);
378 ring_ind--;
379 }
380 return err;
381 }
382
383 void mlx4_en_destroy_rx_ring(struct mlx4_en_priv *priv,
384 struct mlx4_en_rx_ring *ring, u32 size, u16 stride)
385 {
386 struct mlx4_en_dev *mdev = priv->mdev;
387
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;
392 }
393
394 void mlx4_en_deactivate_rx_ring(struct mlx4_en_priv *priv,
395 struct mlx4_en_rx_ring *ring)
396 {
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);
401 }
402
403
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,
408 struct sk_buff *skb,
409 struct mlx4_en_rx_alloc *page_alloc,
410 int length)
411 {
412 struct skb_frag_struct *skb_frags_rx = skb_shinfo(skb)->frags;
413 struct mlx4_en_frag_info *frag_info;
414 int nr;
415 dma_addr_t dma;
416
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)
421 break;
422
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);
429
430 /* Allocate a replacement page */
431 if (mlx4_en_alloc_frag(priv, rx_desc, skb_frags, page_alloc, nr))
432 goto fail;
433
434 /* Unmap buffer */
435 dma_unmap_single(priv->ddev, dma, skb_frag_size(&skb_frags_rx[nr]),
436 PCI_DMA_FROMDEVICE);
437 }
438 /* Adjust size of last fragment to match actual length */
439 if (nr > 0)
440 skb_frag_size_set(&skb_frags_rx[nr - 1],
441 length - priv->frag_info[nr - 1].frag_prefix_size);
442 return nr;
443
444 fail:
445 /* Drop all accumulated fragments (which have already been replaced in
446 * the descriptor) of this packet; remaining fragments are reused... */
447 while (nr > 0) {
448 nr--;
449 __skb_frag_unref(&skb_frags_rx[nr]);
450 }
451 return 0;
452 }
453
454
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,
459 unsigned int length)
460 {
461 struct sk_buff *skb;
462 void *va;
463 int used_frags;
464 dma_addr_t dma;
465
466 skb = netdev_alloc_skb(priv->dev, SMALL_PACKET_SIZE + NET_IP_ALIGN);
467 if (!skb) {
468 en_dbg(RX_ERR, priv, "Failed allocating skb\n");
469 return NULL;
470 }
471 skb_reserve(skb, NET_IP_ALIGN);
472 skb->len = length;
473
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;
477
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,
483 DMA_FROM_DEVICE);
484 skb_copy_to_linear_data(skb, va, length);
485 dma_sync_single_for_device(priv->ddev, dma, length,
486 DMA_FROM_DEVICE);
487 skb->tail += length;
488 } else {
489
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)) {
494 kfree_skb(skb);
495 return NULL;
496 }
497 skb_shinfo(skb)->nr_frags = used_frags;
498
499 /* Copy headers into the skb linear buffer */
500 memcpy(skb->data, va, HEADER_COPY_SIZE);
501 skb->tail += HEADER_COPY_SIZE;
502
503 /* Skip headers in first fragment */
504 skb_shinfo(skb)->frags[0].page_offset += HEADER_COPY_SIZE;
505
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;
509 }
510 return skb;
511 }
512
513 static void validate_loopback(struct mlx4_en_priv *priv, struct sk_buff *skb)
514 {
515 int i;
516 int offset = ETH_HLEN;
517
518 for (i = 0; i < MLX4_LOOPBACK_TEST_PAYLOAD; i++, offset++) {
519 if (*(skb->data + offset) != (unsigned char) (i & 0xff))
520 goto out_loopback;
521 }
522 /* Loopback found */
523 priv->loopback_ok = 1;
524
525 out_loopback:
526 dev_kfree_skb_any(skb);
527 }
528
529 int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int budget)
530 {
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;
536 struct sk_buff *skb;
537 int index;
538 int nr;
539 unsigned int length;
540 int polled = 0;
541 int ip_summed;
542 struct ethhdr *ethh;
543 u64 s_mac;
544
545 if (!priv->port_up)
546 return 0;
547
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];
553
554 /* Process all completed CQEs */
555 while (XNOR(cqe->owner_sr_opcode & MLX4_CQE_OWNER_MASK,
556 cq->mcq.cons_index & cq->size)) {
557
558 skb_frags = ring->rx_info + (index << priv->log_rx_info);
559 rx_desc = ring->buf + (index << ring->log_stride);
560
561 /*
562 * make sure we read the CQE after we read the ownership bit
563 */
564 rmb();
565
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);
573 goto next;
574 }
575 if (unlikely(cqe->badfcs_enc & MLX4_CQE_BAD_FCS)) {
576 en_dbg(RX_ERR, priv, "Accepted frame with bad FCS\n");
577 goto next;
578 }
579
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);
585
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))
591 goto next;
592
593 /*
594 * Packet is OK - process it.
595 */
596 length = be32_to_cpu(cqe->byte_cnt);
597 length -= ring->fcs_del;
598 ring->bytes += length;
599 ring->packets++;
600
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))) {
604 ring->csum_ok++;
605 /* This packet is eligible for LRO if it is:
606 * - DIX Ethernet (type interpretation)
607 * - TCP/IP (v4)
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);
612 if (!gro_skb)
613 goto next;
614
615 nr = mlx4_en_complete_rx_desc(
616 priv, rx_desc,
617 skb_frags, gro_skb,
618 ring->page_alloc, length);
619 if (!nr)
620 goto next;
621
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;
626
627 if (cqe->vlan_my_qpn &
628 cpu_to_be32(MLX4_CQE_VLAN_PRESENT_MASK)) {
629 u16 vid = be16_to_cpu(cqe->sl_vid);
630
631 __vlan_hwaccel_put_tag(gro_skb, vid);
632 }
633
634 if (dev->features & NETIF_F_RXHASH)
635 gro_skb->rxhash = be32_to_cpu(cqe->immed_rss_invalid);
636
637 skb_record_rx_queue(gro_skb, cq->ring);
638 napi_gro_frags(&cq->napi);
639
640 goto next;
641 }
642
643 /* LRO not possible, complete processing here */
644 ip_summed = CHECKSUM_UNNECESSARY;
645 } else {
646 ip_summed = CHECKSUM_NONE;
647 ring->csum_none++;
648 }
649 } else {
650 ip_summed = CHECKSUM_NONE;
651 ring->csum_none++;
652 }
653
654 skb = mlx4_en_rx_skb(priv, rx_desc, skb_frags,
655 ring->page_alloc, length);
656 if (!skb) {
657 priv->stats.rx_dropped++;
658 goto next;
659 }
660
661 if (unlikely(priv->validate_loopback)) {
662 validate_loopback(priv, skb);
663 goto next;
664 }
665
666 skb->ip_summed = ip_summed;
667 skb->protocol = eth_type_trans(skb, dev);
668 skb_record_rx_queue(skb, cq->ring);
669
670 if (dev->features & NETIF_F_RXHASH)
671 skb->rxhash = be32_to_cpu(cqe->immed_rss_invalid);
672
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));
676
677 /* Push it up the stack */
678 netif_receive_skb(skb);
679
680 next:
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 */
687 goto out;
688 }
689 }
690
691 out:
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);
698 return polled;
699 }
700
701
702 void mlx4_en_rx_irq(struct mlx4_cq *mcq)
703 {
704 struct mlx4_en_cq *cq = container_of(mcq, struct mlx4_en_cq, mcq);
705 struct mlx4_en_priv *priv = netdev_priv(cq->dev);
706
707 if (priv->port_up)
708 napi_schedule(&cq->napi);
709 else
710 mlx4_en_arm_cq(priv, cq);
711 }
712
713 /* Rx CQ polling - called by NAPI */
714 int mlx4_en_poll_rx_cq(struct napi_struct *napi, int budget)
715 {
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);
719 int done;
720
721 done = mlx4_en_process_rx_cq(dev, cq, budget);
722
723 /* If we used up all the quota - we're probably not done yet... */
724 if (done == budget)
725 INC_PERF_COUNTER(priv->pstats.napi_quota);
726 else {
727 /* Done for now */
728 napi_complete(napi);
729 mlx4_en_arm_cq(priv, cq);
730 }
731 return done;
732 }
733
734
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)
738 {
739 u16 res = MLX4_EN_ALLOC_SIZE % stride;
740 u16 offset = MLX4_EN_ALLOC_SIZE - stride - res + align;
741
742 en_dbg(DRV, priv, "Calculated last offset for stride:%d align:%d "
743 "res:%d offset:%d\n", stride, align, res, offset);
744 return offset;
745 }
746
747
748 static int frag_sizes[] = {
749 FRAG_SZ0,
750 FRAG_SZ1,
751 FRAG_SZ2,
752 FRAG_SZ3
753 };
754
755 void mlx4_en_calc_rx_buf(struct net_device *dev)
756 {
757 struct mlx4_en_priv *priv = netdev_priv(dev);
758 int eff_mtu = dev->mtu + ETH_HLEN + VLAN_HLEN + ETH_LLC_SNAP_SIZE;
759 int buf_size = 0;
760 int i = 0;
761
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;
767 if (!i) {
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);
771 } else {
772 priv->frag_info[i].frag_align = 0;
773 priv->frag_info[i].frag_stride =
774 ALIGN(frag_sizes[i], SMP_CACHE_BYTES);
775 }
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;
780 i++;
781 }
782
783 priv->num_frags = i;
784 priv->rx_skb_size = eff_mtu;
785 priv->log_rx_info = ROUNDUP_LOG2(i * sizeof(struct skb_frag_struct));
786
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);
797 }
798 }
799
800 /* RSS related functions */
801
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,
805 struct mlx4_qp *qp)
806 {
807 struct mlx4_en_dev *mdev = priv->mdev;
808 struct mlx4_qp_context *context;
809 int err = 0;
810
811 context = kmalloc(sizeof *context , GFP_KERNEL);
812 if (!context) {
813 en_err(priv, "Failed to allocate qp context\n");
814 return -ENOMEM;
815 }
816
817 err = mlx4_qp_alloc(mdev->dev, qpn, qp);
818 if (err) {
819 en_err(priv, "Failed to allocate qp #%x\n", qpn);
820 goto out;
821 }
822 qp->event = mlx4_en_sqp_event;
823
824 memset(context, 0, sizeof *context);
825 mlx4_en_fill_qp_context(priv, ring->actual_size, ring->stride, 0, 0,
826 qpn, ring->cqn, -1, context);
827 context->db_rec_addr = cpu_to_be64(ring->wqres.db.dma);
828
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;
833 } else
834 ring->fcs_del = 0;
835
836 err = mlx4_qp_to_ready(mdev->dev, &ring->wqres.mtt, context, qp, state);
837 if (err) {
838 mlx4_qp_remove(mdev->dev, qp);
839 mlx4_qp_free(mdev->dev, qp);
840 }
841 mlx4_en_update_rx_prod_db(ring);
842 out:
843 kfree(context);
844 return err;
845 }
846
847 int mlx4_en_create_drop_qp(struct mlx4_en_priv *priv)
848 {
849 int err;
850 u32 qpn;
851
852 err = mlx4_qp_reserve_range(priv->mdev->dev, 1, 1, &qpn);
853 if (err) {
854 en_err(priv, "Failed reserving drop qpn\n");
855 return err;
856 }
857 err = mlx4_qp_alloc(priv->mdev->dev, qpn, &priv->drop_qp);
858 if (err) {
859 en_err(priv, "Failed allocating drop qp\n");
860 mlx4_qp_release_range(priv->mdev->dev, qpn, 1);
861 return err;
862 }
863
864 return 0;
865 }
866
867 void mlx4_en_destroy_drop_qp(struct mlx4_en_priv *priv)
868 {
869 u32 qpn;
870
871 qpn = priv->drop_qp.qpn;
872 mlx4_qp_remove(priv->mdev->dev, &priv->drop_qp);
873 mlx4_qp_free(priv->mdev->dev, &priv->drop_qp);
874 mlx4_qp_release_range(priv->mdev->dev, qpn, 1);
875 }
876
877 /* Allocate rx qp's and configure them according to rss map */
878 int mlx4_en_config_rss_steer(struct mlx4_en_priv *priv)
879 {
880 struct mlx4_en_dev *mdev = priv->mdev;
881 struct mlx4_en_rss_map *rss_map = &priv->rss_map;
882 struct mlx4_qp_context context;
883 struct mlx4_rss_context *rss_context;
884 int rss_rings;
885 void *ptr;
886 u8 rss_mask = (MLX4_RSS_IPV4 | MLX4_RSS_TCP_IPV4 | MLX4_RSS_IPV6 |
887 MLX4_RSS_TCP_IPV6);
888 int i, qpn;
889 int err = 0;
890 int good_qps = 0;
891 static const u32 rsskey[10] = { 0xD181C62C, 0xF7F4DB5B, 0x1983A2FC,
892 0x943E1ADB, 0xD9389E6B, 0xD1039C2C, 0xA74499AD,
893 0x593D56D9, 0xF3253C06, 0x2ADC1FFC};
894
895 en_dbg(DRV, priv, "Configuring rss steering\n");
896 err = mlx4_qp_reserve_range(mdev->dev, priv->rx_ring_num,
897 priv->rx_ring_num,
898 &rss_map->base_qpn);
899 if (err) {
900 en_err(priv, "Failed reserving %d qps\n", priv->rx_ring_num);
901 return err;
902 }
903
904 for (i = 0; i < priv->rx_ring_num; i++) {
905 qpn = rss_map->base_qpn + i;
906 err = mlx4_en_config_rss_qp(priv, qpn, &priv->rx_ring[i],
907 &rss_map->state[i],
908 &rss_map->qps[i]);
909 if (err)
910 goto rss_err;
911
912 ++good_qps;
913 }
914
915 /* Configure RSS indirection qp */
916 err = mlx4_qp_alloc(mdev->dev, priv->base_qpn, &rss_map->indir_qp);
917 if (err) {
918 en_err(priv, "Failed to allocate RSS indirection QP\n");
919 goto rss_err;
920 }
921 rss_map->indir_qp.event = mlx4_en_sqp_event;
922 mlx4_en_fill_qp_context(priv, 0, 0, 0, 1, priv->base_qpn,
923 priv->rx_ring[0].cqn, -1, &context);
924
925 if (!priv->prof->rss_rings || priv->prof->rss_rings > priv->rx_ring_num)
926 rss_rings = priv->rx_ring_num;
927 else
928 rss_rings = priv->prof->rss_rings;
929
930 ptr = ((void *) &context) + offsetof(struct mlx4_qp_context, pri_path)
931 + MLX4_RSS_OFFSET_IN_QPC_PRI_PATH;
932 rss_context = ptr;
933 rss_context->base_qpn = cpu_to_be32(ilog2(rss_rings) << 24 |
934 (rss_map->base_qpn));
935 rss_context->default_qpn = cpu_to_be32(rss_map->base_qpn);
936 if (priv->mdev->profile.udp_rss) {
937 rss_mask |= MLX4_RSS_UDP_IPV4 | MLX4_RSS_UDP_IPV6;
938 rss_context->base_qpn_udp = rss_context->default_qpn;
939 }
940 rss_context->flags = rss_mask;
941 rss_context->hash_fn = MLX4_RSS_HASH_TOP;
942 for (i = 0; i < 10; i++)
943 rss_context->rss_key[i] = cpu_to_be32(rsskey[i]);
944
945 err = mlx4_qp_to_ready(mdev->dev, &priv->res.mtt, &context,
946 &rss_map->indir_qp, &rss_map->indir_state);
947 if (err)
948 goto indir_err;
949
950 return 0;
951
952 indir_err:
953 mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
954 MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->indir_qp);
955 mlx4_qp_remove(mdev->dev, &rss_map->indir_qp);
956 mlx4_qp_free(mdev->dev, &rss_map->indir_qp);
957 rss_err:
958 for (i = 0; i < good_qps; i++) {
959 mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i],
960 MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->qps[i]);
961 mlx4_qp_remove(mdev->dev, &rss_map->qps[i]);
962 mlx4_qp_free(mdev->dev, &rss_map->qps[i]);
963 }
964 mlx4_qp_release_range(mdev->dev, rss_map->base_qpn, priv->rx_ring_num);
965 return err;
966 }
967
968 void mlx4_en_release_rss_steer(struct mlx4_en_priv *priv)
969 {
970 struct mlx4_en_dev *mdev = priv->mdev;
971 struct mlx4_en_rss_map *rss_map = &priv->rss_map;
972 int i;
973
974 mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
975 MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->indir_qp);
976 mlx4_qp_remove(mdev->dev, &rss_map->indir_qp);
977 mlx4_qp_free(mdev->dev, &rss_map->indir_qp);
978
979 for (i = 0; i < priv->rx_ring_num; i++) {
980 mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i],
981 MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->qps[i]);
982 mlx4_qp_remove(mdev->dev, &rss_map->qps[i]);
983 mlx4_qp_free(mdev->dev, &rss_map->qps[i]);
984 }
985 mlx4_qp_release_range(mdev->dev, rss_map->base_qpn, priv->rx_ring_num);
986 }
987
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Linux kernel - Deliverables
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