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net: Remove redundant NAPI functions
[deliverable/linux.git] / drivers / net / 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/mlx4/qp.h>
36 #include <linux/skbuff.h>
37 #include <linux/if_ether.h>
38 #include <linux/if_vlan.h>
39 #include <linux/vmalloc.h>
40
41 #include "mlx4_en.h"
42
43 static void *get_wqe(struct mlx4_en_rx_ring *ring, int n)
44 {
45 int offset = n << ring->srq.wqe_shift;
46 return ring->buf + offset;
47 }
48
49 static void mlx4_en_srq_event(struct mlx4_srq *srq, enum mlx4_event type)
50 {
51 return;
52 }
53
54 static int mlx4_en_get_frag_header(struct skb_frag_struct *frags, void **mac_hdr,
55 void **ip_hdr, void **tcpudp_hdr,
56 u64 *hdr_flags, void *priv)
57 {
58 *mac_hdr = page_address(frags->page) + frags->page_offset;
59 *ip_hdr = *mac_hdr + ETH_HLEN;
60 *tcpudp_hdr = (struct tcphdr *)(*ip_hdr + sizeof(struct iphdr));
61 *hdr_flags = LRO_IPV4 | LRO_TCP;
62
63 return 0;
64 }
65
66 static int mlx4_en_alloc_frag(struct mlx4_en_priv *priv,
67 struct mlx4_en_rx_desc *rx_desc,
68 struct skb_frag_struct *skb_frags,
69 struct mlx4_en_rx_alloc *ring_alloc,
70 int i)
71 {
72 struct mlx4_en_dev *mdev = priv->mdev;
73 struct mlx4_en_frag_info *frag_info = &priv->frag_info[i];
74 struct mlx4_en_rx_alloc *page_alloc = &ring_alloc[i];
75 struct page *page;
76 dma_addr_t dma;
77
78 if (page_alloc->offset == frag_info->last_offset) {
79 /* Allocate new page */
80 page = alloc_pages(GFP_ATOMIC | __GFP_COMP, MLX4_EN_ALLOC_ORDER);
81 if (!page)
82 return -ENOMEM;
83
84 skb_frags[i].page = page_alloc->page;
85 skb_frags[i].page_offset = page_alloc->offset;
86 page_alloc->page = page;
87 page_alloc->offset = frag_info->frag_align;
88 } else {
89 page = page_alloc->page;
90 get_page(page);
91
92 skb_frags[i].page = page;
93 skb_frags[i].page_offset = page_alloc->offset;
94 page_alloc->offset += frag_info->frag_stride;
95 }
96 dma = pci_map_single(mdev->pdev, page_address(skb_frags[i].page) +
97 skb_frags[i].page_offset, frag_info->frag_size,
98 PCI_DMA_FROMDEVICE);
99 rx_desc->data[i].addr = cpu_to_be64(dma);
100 return 0;
101 }
102
103 static int mlx4_en_init_allocator(struct mlx4_en_priv *priv,
104 struct mlx4_en_rx_ring *ring)
105 {
106 struct mlx4_en_rx_alloc *page_alloc;
107 int i;
108
109 for (i = 0; i < priv->num_frags; i++) {
110 page_alloc = &ring->page_alloc[i];
111 page_alloc->page = alloc_pages(GFP_ATOMIC | __GFP_COMP,
112 MLX4_EN_ALLOC_ORDER);
113 if (!page_alloc->page)
114 goto out;
115
116 page_alloc->offset = priv->frag_info[i].frag_align;
117 mlx4_dbg(DRV, priv, "Initialized allocator:%d with page:%p\n",
118 i, page_alloc->page);
119 }
120 return 0;
121
122 out:
123 while (i--) {
124 page_alloc = &ring->page_alloc[i];
125 put_page(page_alloc->page);
126 page_alloc->page = NULL;
127 }
128 return -ENOMEM;
129 }
130
131 static void mlx4_en_destroy_allocator(struct mlx4_en_priv *priv,
132 struct mlx4_en_rx_ring *ring)
133 {
134 struct mlx4_en_rx_alloc *page_alloc;
135 int i;
136
137 for (i = 0; i < priv->num_frags; i++) {
138 page_alloc = &ring->page_alloc[i];
139 mlx4_dbg(DRV, priv, "Freeing allocator:%d count:%d\n",
140 i, page_count(page_alloc->page));
141
142 put_page(page_alloc->page);
143 page_alloc->page = NULL;
144 }
145 }
146
147
148 static void mlx4_en_init_rx_desc(struct mlx4_en_priv *priv,
149 struct mlx4_en_rx_ring *ring, int index)
150 {
151 struct mlx4_en_rx_desc *rx_desc = ring->buf + ring->stride * index;
152 struct skb_frag_struct *skb_frags = ring->rx_info +
153 (index << priv->log_rx_info);
154 int possible_frags;
155 int i;
156
157 /* Pre-link descriptor */
158 rx_desc->next.next_wqe_index = cpu_to_be16((index + 1) & ring->size_mask);
159
160 /* Set size and memtype fields */
161 for (i = 0; i < priv->num_frags; i++) {
162 skb_frags[i].size = priv->frag_info[i].frag_size;
163 rx_desc->data[i].byte_count =
164 cpu_to_be32(priv->frag_info[i].frag_size);
165 rx_desc->data[i].lkey = cpu_to_be32(priv->mdev->mr.key);
166 }
167
168 /* If the number of used fragments does not fill up the ring stride,
169 * remaining (unused) fragments must be padded with null address/size
170 * and a special memory key */
171 possible_frags = (ring->stride - sizeof(struct mlx4_en_rx_desc)) / DS_SIZE;
172 for (i = priv->num_frags; i < possible_frags; i++) {
173 rx_desc->data[i].byte_count = 0;
174 rx_desc->data[i].lkey = cpu_to_be32(MLX4_EN_MEMTYPE_PAD);
175 rx_desc->data[i].addr = 0;
176 }
177 }
178
179
180 static int mlx4_en_prepare_rx_desc(struct mlx4_en_priv *priv,
181 struct mlx4_en_rx_ring *ring, int index)
182 {
183 struct mlx4_en_rx_desc *rx_desc = ring->buf + (index * ring->stride);
184 struct skb_frag_struct *skb_frags = ring->rx_info +
185 (index << priv->log_rx_info);
186 int i;
187
188 for (i = 0; i < priv->num_frags; i++)
189 if (mlx4_en_alloc_frag(priv, rx_desc, skb_frags, ring->page_alloc, i))
190 goto err;
191
192 return 0;
193
194 err:
195 while (i--)
196 put_page(skb_frags[i].page);
197 return -ENOMEM;
198 }
199
200 static inline void mlx4_en_update_rx_prod_db(struct mlx4_en_rx_ring *ring)
201 {
202 *ring->wqres.db.db = cpu_to_be32(ring->prod & 0xffff);
203 }
204
205 static int mlx4_en_fill_rx_buffers(struct mlx4_en_priv *priv)
206 {
207 struct mlx4_en_dev *mdev = priv->mdev;
208 struct mlx4_en_rx_ring *ring;
209 int ring_ind;
210 int buf_ind;
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 mlx4_err(mdev, "Failed to allocate "
220 "enough rx buffers\n");
221 return -ENOMEM;
222 } else {
223 if (netif_msg_rx_err(priv))
224 mlx4_warn(mdev,
225 "Only %d buffers allocated\n",
226 ring->actual_size);
227 goto out;
228 }
229 }
230 ring->actual_size++;
231 ring->prod++;
232 }
233 }
234 out:
235 return 0;
236 }
237
238 static int mlx4_en_fill_rx_buf(struct net_device *dev,
239 struct mlx4_en_rx_ring *ring)
240 {
241 struct mlx4_en_priv *priv = netdev_priv(dev);
242 int num = 0;
243 int err;
244
245 while ((u32) (ring->prod - ring->cons) < ring->actual_size) {
246 err = mlx4_en_prepare_rx_desc(priv, ring, ring->prod &
247 ring->size_mask);
248 if (err) {
249 if (netif_msg_rx_err(priv))
250 mlx4_warn(priv->mdev,
251 "Failed preparing rx descriptor\n");
252 priv->port_stats.rx_alloc_failed++;
253 break;
254 }
255 ++num;
256 ++ring->prod;
257 }
258 if ((u32) (ring->prod - ring->cons) == ring->size)
259 ring->full = 1;
260
261 return num;
262 }
263
264 static void mlx4_en_free_rx_buf(struct mlx4_en_priv *priv,
265 struct mlx4_en_rx_ring *ring)
266 {
267 struct mlx4_en_dev *mdev = priv->mdev;
268 struct skb_frag_struct *skb_frags;
269 struct mlx4_en_rx_desc *rx_desc;
270 dma_addr_t dma;
271 int index;
272 int nr;
273
274 mlx4_dbg(DRV, priv, "Freeing Rx buf - cons:%d prod:%d\n",
275 ring->cons, ring->prod);
276
277 /* Unmap and free Rx buffers */
278 BUG_ON((u32) (ring->prod - ring->cons) > ring->size);
279 while (ring->cons != ring->prod) {
280 index = ring->cons & ring->size_mask;
281 rx_desc = ring->buf + (index << ring->log_stride);
282 skb_frags = ring->rx_info + (index << priv->log_rx_info);
283 mlx4_dbg(DRV, priv, "Processing descriptor:%d\n", index);
284
285 for (nr = 0; nr < priv->num_frags; nr++) {
286 mlx4_dbg(DRV, priv, "Freeing fragment:%d\n", nr);
287 dma = be64_to_cpu(rx_desc->data[nr].addr);
288
289 mlx4_dbg(DRV, priv, "Unmaping buffer at dma:0x%llx\n", (u64) dma);
290 pci_unmap_single(mdev->pdev, dma, skb_frags[nr].size,
291 PCI_DMA_FROMDEVICE);
292 put_page(skb_frags[nr].page);
293 }
294 ++ring->cons;
295 }
296 }
297
298
299 void mlx4_en_rx_refill(struct work_struct *work)
300 {
301 struct delayed_work *delay = container_of(work, struct delayed_work, work);
302 struct mlx4_en_priv *priv = container_of(delay, struct mlx4_en_priv,
303 refill_task);
304 struct mlx4_en_dev *mdev = priv->mdev;
305 struct net_device *dev = priv->dev;
306 struct mlx4_en_rx_ring *ring;
307 int need_refill = 0;
308 int i;
309
310 mutex_lock(&mdev->state_lock);
311 if (!mdev->device_up || !priv->port_up)
312 goto out;
313
314 /* We only get here if there are no receive buffers, so we can't race
315 * with Rx interrupts while filling buffers */
316 for (i = 0; i < priv->rx_ring_num; i++) {
317 ring = &priv->rx_ring[i];
318 if (ring->need_refill) {
319 if (mlx4_en_fill_rx_buf(dev, ring)) {
320 ring->need_refill = 0;
321 mlx4_en_update_rx_prod_db(ring);
322 } else
323 need_refill = 1;
324 }
325 }
326 if (need_refill)
327 queue_delayed_work(mdev->workqueue, &priv->refill_task, HZ);
328
329 out:
330 mutex_unlock(&mdev->state_lock);
331 }
332
333
334 int mlx4_en_create_rx_ring(struct mlx4_en_priv *priv,
335 struct mlx4_en_rx_ring *ring, u32 size, u16 stride)
336 {
337 struct mlx4_en_dev *mdev = priv->mdev;
338 int err;
339 int tmp;
340
341 /* Sanity check SRQ size before proceeding */
342 if (size >= mdev->dev->caps.max_srq_wqes)
343 return -EINVAL;
344
345 ring->prod = 0;
346 ring->cons = 0;
347 ring->size = size;
348 ring->size_mask = size - 1;
349 ring->stride = stride;
350 ring->log_stride = ffs(ring->stride) - 1;
351 ring->buf_size = ring->size * ring->stride;
352
353 tmp = size * roundup_pow_of_two(MLX4_EN_MAX_RX_FRAGS *
354 sizeof(struct skb_frag_struct));
355 ring->rx_info = vmalloc(tmp);
356 if (!ring->rx_info) {
357 mlx4_err(mdev, "Failed allocating rx_info ring\n");
358 return -ENOMEM;
359 }
360 mlx4_dbg(DRV, priv, "Allocated rx_info ring at addr:%p size:%d\n",
361 ring->rx_info, tmp);
362
363 err = mlx4_alloc_hwq_res(mdev->dev, &ring->wqres,
364 ring->buf_size, 2 * PAGE_SIZE);
365 if (err)
366 goto err_ring;
367
368 err = mlx4_en_map_buffer(&ring->wqres.buf);
369 if (err) {
370 mlx4_err(mdev, "Failed to map RX buffer\n");
371 goto err_hwq;
372 }
373 ring->buf = ring->wqres.buf.direct.buf;
374
375 /* Configure lro mngr */
376 memset(&ring->lro, 0, sizeof(struct net_lro_mgr));
377 ring->lro.dev = priv->dev;
378 ring->lro.features = LRO_F_NAPI;
379 ring->lro.frag_align_pad = NET_IP_ALIGN;
380 ring->lro.ip_summed = CHECKSUM_UNNECESSARY;
381 ring->lro.ip_summed_aggr = CHECKSUM_UNNECESSARY;
382 ring->lro.max_desc = mdev->profile.num_lro;
383 ring->lro.max_aggr = MAX_SKB_FRAGS;
384 ring->lro.lro_arr = kzalloc(mdev->profile.num_lro *
385 sizeof(struct net_lro_desc),
386 GFP_KERNEL);
387 if (!ring->lro.lro_arr) {
388 mlx4_err(mdev, "Failed to allocate lro array\n");
389 goto err_map;
390 }
391 ring->lro.get_frag_header = mlx4_en_get_frag_header;
392
393 return 0;
394
395 err_map:
396 mlx4_en_unmap_buffer(&ring->wqres.buf);
397 err_hwq:
398 mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size);
399 err_ring:
400 vfree(ring->rx_info);
401 ring->rx_info = NULL;
402 return err;
403 }
404
405 int mlx4_en_activate_rx_rings(struct mlx4_en_priv *priv)
406 {
407 struct mlx4_en_dev *mdev = priv->mdev;
408 struct mlx4_wqe_srq_next_seg *next;
409 struct mlx4_en_rx_ring *ring;
410 int i;
411 int ring_ind;
412 int err;
413 int stride = roundup_pow_of_two(sizeof(struct mlx4_en_rx_desc) +
414 DS_SIZE * priv->num_frags);
415 int max_gs = (stride - sizeof(struct mlx4_wqe_srq_next_seg)) / DS_SIZE;
416
417 for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
418 ring = &priv->rx_ring[ring_ind];
419
420 ring->prod = 0;
421 ring->cons = 0;
422 ring->actual_size = 0;
423 ring->cqn = priv->rx_cq[ring_ind].mcq.cqn;
424
425 ring->stride = stride;
426 ring->log_stride = ffs(ring->stride) - 1;
427 ring->buf_size = ring->size * ring->stride;
428
429 memset(ring->buf, 0, ring->buf_size);
430 mlx4_en_update_rx_prod_db(ring);
431
432 /* Initailize all descriptors */
433 for (i = 0; i < ring->size; i++)
434 mlx4_en_init_rx_desc(priv, ring, i);
435
436 /* Initialize page allocators */
437 err = mlx4_en_init_allocator(priv, ring);
438 if (err) {
439 mlx4_err(mdev, "Failed initializing ring allocator\n");
440 goto err_allocator;
441 }
442
443 /* Fill Rx buffers */
444 ring->full = 0;
445 }
446 err = mlx4_en_fill_rx_buffers(priv);
447 if (err)
448 goto err_buffers;
449
450 for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) {
451 ring = &priv->rx_ring[ring_ind];
452
453 mlx4_en_update_rx_prod_db(ring);
454
455 /* Configure SRQ representing the ring */
456 ring->srq.max = ring->size;
457 ring->srq.max_gs = max_gs;
458 ring->srq.wqe_shift = ilog2(ring->stride);
459
460 for (i = 0; i < ring->srq.max; ++i) {
461 next = get_wqe(ring, i);
462 next->next_wqe_index =
463 cpu_to_be16((i + 1) & (ring->srq.max - 1));
464 }
465
466 err = mlx4_srq_alloc(mdev->dev, mdev->priv_pdn, &ring->wqres.mtt,
467 ring->wqres.db.dma, &ring->srq);
468 if (err){
469 mlx4_err(mdev, "Failed to allocate srq\n");
470 goto err_srq;
471 }
472 ring->srq.event = mlx4_en_srq_event;
473 }
474
475 return 0;
476
477 err_srq:
478 while (ring_ind >= 0) {
479 ring = &priv->rx_ring[ring_ind];
480 mlx4_srq_free(mdev->dev, &ring->srq);
481 ring_ind--;
482 }
483
484 err_buffers:
485 for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++)
486 mlx4_en_free_rx_buf(priv, &priv->rx_ring[ring_ind]);
487
488 ring_ind = priv->rx_ring_num - 1;
489 err_allocator:
490 while (ring_ind >= 0) {
491 mlx4_en_destroy_allocator(priv, &priv->rx_ring[ring_ind]);
492 ring_ind--;
493 }
494 return err;
495 }
496
497 void mlx4_en_destroy_rx_ring(struct mlx4_en_priv *priv,
498 struct mlx4_en_rx_ring *ring)
499 {
500 struct mlx4_en_dev *mdev = priv->mdev;
501
502 kfree(ring->lro.lro_arr);
503 mlx4_en_unmap_buffer(&ring->wqres.buf);
504 mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size);
505 vfree(ring->rx_info);
506 ring->rx_info = NULL;
507 }
508
509 void mlx4_en_deactivate_rx_ring(struct mlx4_en_priv *priv,
510 struct mlx4_en_rx_ring *ring)
511 {
512 struct mlx4_en_dev *mdev = priv->mdev;
513
514 mlx4_srq_free(mdev->dev, &ring->srq);
515 mlx4_en_free_rx_buf(priv, ring);
516 mlx4_en_destroy_allocator(priv, ring);
517 }
518
519
520 /* Unmap a completed descriptor and free unused pages */
521 static int mlx4_en_complete_rx_desc(struct mlx4_en_priv *priv,
522 struct mlx4_en_rx_desc *rx_desc,
523 struct skb_frag_struct *skb_frags,
524 struct skb_frag_struct *skb_frags_rx,
525 struct mlx4_en_rx_alloc *page_alloc,
526 int length)
527 {
528 struct mlx4_en_dev *mdev = priv->mdev;
529 struct mlx4_en_frag_info *frag_info;
530 int nr;
531 dma_addr_t dma;
532
533 /* Collect used fragments while replacing them in the HW descirptors */
534 for (nr = 0; nr < priv->num_frags; nr++) {
535 frag_info = &priv->frag_info[nr];
536 if (length <= frag_info->frag_prefix_size)
537 break;
538
539 /* Save page reference in skb */
540 skb_frags_rx[nr].page = skb_frags[nr].page;
541 skb_frags_rx[nr].size = skb_frags[nr].size;
542 skb_frags_rx[nr].page_offset = skb_frags[nr].page_offset;
543 dma = be64_to_cpu(rx_desc->data[nr].addr);
544
545 /* Allocate a replacement page */
546 if (mlx4_en_alloc_frag(priv, rx_desc, skb_frags, page_alloc, nr))
547 goto fail;
548
549 /* Unmap buffer */
550 pci_unmap_single(mdev->pdev, dma, skb_frags[nr].size,
551 PCI_DMA_FROMDEVICE);
552 }
553 /* Adjust size of last fragment to match actual length */
554 skb_frags_rx[nr - 1].size = length -
555 priv->frag_info[nr - 1].frag_prefix_size;
556 return nr;
557
558 fail:
559 /* Drop all accumulated fragments (which have already been replaced in
560 * the descriptor) of this packet; remaining fragments are reused... */
561 while (nr > 0) {
562 nr--;
563 put_page(skb_frags_rx[nr].page);
564 }
565 return 0;
566 }
567
568
569 static struct sk_buff *mlx4_en_rx_skb(struct mlx4_en_priv *priv,
570 struct mlx4_en_rx_desc *rx_desc,
571 struct skb_frag_struct *skb_frags,
572 struct mlx4_en_rx_alloc *page_alloc,
573 unsigned int length)
574 {
575 struct mlx4_en_dev *mdev = priv->mdev;
576 struct sk_buff *skb;
577 void *va;
578 int used_frags;
579 dma_addr_t dma;
580
581 skb = dev_alloc_skb(SMALL_PACKET_SIZE + NET_IP_ALIGN);
582 if (!skb) {
583 mlx4_dbg(RX_ERR, priv, "Failed allocating skb\n");
584 return NULL;
585 }
586 skb->dev = priv->dev;
587 skb_reserve(skb, NET_IP_ALIGN);
588 skb->len = length;
589 skb->truesize = length + sizeof(struct sk_buff);
590
591 /* Get pointer to first fragment so we could copy the headers into the
592 * (linear part of the) skb */
593 va = page_address(skb_frags[0].page) + skb_frags[0].page_offset;
594
595 if (length <= SMALL_PACKET_SIZE) {
596 /* We are copying all relevant data to the skb - temporarily
597 * synch buffers for the copy */
598 dma = be64_to_cpu(rx_desc->data[0].addr);
599 dma_sync_single_range_for_cpu(&mdev->pdev->dev, dma, 0,
600 length, DMA_FROM_DEVICE);
601 skb_copy_to_linear_data(skb, va, length);
602 dma_sync_single_range_for_device(&mdev->pdev->dev, dma, 0,
603 length, DMA_FROM_DEVICE);
604 skb->tail += length;
605 } else {
606
607 /* Move relevant fragments to skb */
608 used_frags = mlx4_en_complete_rx_desc(priv, rx_desc, skb_frags,
609 skb_shinfo(skb)->frags,
610 page_alloc, length);
611 skb_shinfo(skb)->nr_frags = used_frags;
612
613 /* Copy headers into the skb linear buffer */
614 memcpy(skb->data, va, HEADER_COPY_SIZE);
615 skb->tail += HEADER_COPY_SIZE;
616
617 /* Skip headers in first fragment */
618 skb_shinfo(skb)->frags[0].page_offset += HEADER_COPY_SIZE;
619
620 /* Adjust size of first fragment */
621 skb_shinfo(skb)->frags[0].size -= HEADER_COPY_SIZE;
622 skb->data_len = length - HEADER_COPY_SIZE;
623 }
624 return skb;
625 }
626
627 static void mlx4_en_copy_desc(struct mlx4_en_priv *priv,
628 struct mlx4_en_rx_ring *ring,
629 int from, int to, int num)
630 {
631 struct skb_frag_struct *skb_frags_from;
632 struct skb_frag_struct *skb_frags_to;
633 struct mlx4_en_rx_desc *rx_desc_from;
634 struct mlx4_en_rx_desc *rx_desc_to;
635 int from_index, to_index;
636 int nr, i;
637
638 for (i = 0; i < num; i++) {
639 from_index = (from + i) & ring->size_mask;
640 to_index = (to + i) & ring->size_mask;
641 skb_frags_from = ring->rx_info + (from_index << priv->log_rx_info);
642 skb_frags_to = ring->rx_info + (to_index << priv->log_rx_info);
643 rx_desc_from = ring->buf + (from_index << ring->log_stride);
644 rx_desc_to = ring->buf + (to_index << ring->log_stride);
645
646 for (nr = 0; nr < priv->num_frags; nr++) {
647 skb_frags_to[nr].page = skb_frags_from[nr].page;
648 skb_frags_to[nr].page_offset = skb_frags_from[nr].page_offset;
649 rx_desc_to->data[nr].addr = rx_desc_from->data[nr].addr;
650 }
651 }
652 }
653
654
655 int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int budget)
656 {
657 struct mlx4_en_priv *priv = netdev_priv(dev);
658 struct mlx4_en_dev *mdev = priv->mdev;
659 struct mlx4_cqe *cqe;
660 struct mlx4_en_rx_ring *ring = &priv->rx_ring[cq->ring];
661 struct skb_frag_struct *skb_frags;
662 struct skb_frag_struct lro_frags[MLX4_EN_MAX_RX_FRAGS];
663 struct mlx4_en_rx_desc *rx_desc;
664 struct sk_buff *skb;
665 int index;
666 int nr;
667 unsigned int length;
668 int polled = 0;
669 int ip_summed;
670
671 if (!priv->port_up)
672 return 0;
673
674 /* We assume a 1:1 mapping between CQEs and Rx descriptors, so Rx
675 * descriptor offset can be deduced from the CQE index instead of
676 * reading 'cqe->index' */
677 index = cq->mcq.cons_index & ring->size_mask;
678 cqe = &cq->buf[index];
679
680 /* Process all completed CQEs */
681 while (XNOR(cqe->owner_sr_opcode & MLX4_CQE_OWNER_MASK,
682 cq->mcq.cons_index & cq->size)) {
683
684 skb_frags = ring->rx_info + (index << priv->log_rx_info);
685 rx_desc = ring->buf + (index << ring->log_stride);
686
687 /*
688 * make sure we read the CQE after we read the ownership bit
689 */
690 rmb();
691
692 /* Drop packet on bad receive or bad checksum */
693 if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) ==
694 MLX4_CQE_OPCODE_ERROR)) {
695 mlx4_err(mdev, "CQE completed in error - vendor "
696 "syndrom:%d syndrom:%d\n",
697 ((struct mlx4_err_cqe *) cqe)->vendor_err_syndrome,
698 ((struct mlx4_err_cqe *) cqe)->syndrome);
699 goto next;
700 }
701 if (unlikely(cqe->badfcs_enc & MLX4_CQE_BAD_FCS)) {
702 mlx4_dbg(RX_ERR, priv, "Accepted frame with bad FCS\n");
703 goto next;
704 }
705
706 /*
707 * Packet is OK - process it.
708 */
709 length = be32_to_cpu(cqe->byte_cnt);
710 ring->bytes += length;
711 ring->packets++;
712
713 if (likely(priv->rx_csum)) {
714 if ((cqe->status & cpu_to_be16(MLX4_CQE_STATUS_IPOK)) &&
715 (cqe->checksum == cpu_to_be16(0xffff))) {
716 priv->port_stats.rx_chksum_good++;
717 /* This packet is eligible for LRO if it is:
718 * - DIX Ethernet (type interpretation)
719 * - TCP/IP (v4)
720 * - without IP options
721 * - not an IP fragment */
722 if (mlx4_en_can_lro(cqe->status) &&
723 dev->features & NETIF_F_LRO) {
724
725 nr = mlx4_en_complete_rx_desc(
726 priv, rx_desc,
727 skb_frags, lro_frags,
728 ring->page_alloc, length);
729 if (!nr)
730 goto next;
731
732 if (priv->vlgrp && (cqe->vlan_my_qpn &
733 cpu_to_be32(MLX4_CQE_VLAN_PRESENT_MASK))) {
734 lro_vlan_hwaccel_receive_frags(
735 &ring->lro, lro_frags,
736 length, length,
737 priv->vlgrp,
738 be16_to_cpu(cqe->sl_vid),
739 NULL, 0);
740 } else
741 lro_receive_frags(&ring->lro,
742 lro_frags,
743 length,
744 length,
745 NULL, 0);
746
747 goto next;
748 }
749
750 /* LRO not possible, complete processing here */
751 ip_summed = CHECKSUM_UNNECESSARY;
752 INC_PERF_COUNTER(priv->pstats.lro_misses);
753 } else {
754 ip_summed = CHECKSUM_NONE;
755 priv->port_stats.rx_chksum_none++;
756 }
757 } else {
758 ip_summed = CHECKSUM_NONE;
759 priv->port_stats.rx_chksum_none++;
760 }
761
762 skb = mlx4_en_rx_skb(priv, rx_desc, skb_frags,
763 ring->page_alloc, length);
764 if (!skb) {
765 priv->stats.rx_dropped++;
766 goto next;
767 }
768
769 skb->ip_summed = ip_summed;
770 skb->protocol = eth_type_trans(skb, dev);
771
772 /* Push it up the stack */
773 if (priv->vlgrp && (be32_to_cpu(cqe->vlan_my_qpn) &
774 MLX4_CQE_VLAN_PRESENT_MASK)) {
775 vlan_hwaccel_receive_skb(skb, priv->vlgrp,
776 be16_to_cpu(cqe->sl_vid));
777 } else
778 netif_receive_skb(skb);
779
780 next:
781 ++cq->mcq.cons_index;
782 index = (cq->mcq.cons_index) & ring->size_mask;
783 cqe = &cq->buf[index];
784 if (++polled == budget) {
785 /* We are here because we reached the NAPI budget -
786 * flush only pending LRO sessions */
787 lro_flush_all(&ring->lro);
788 goto out;
789 }
790 }
791
792 /* If CQ is empty flush all LRO sessions unconditionally */
793 lro_flush_all(&ring->lro);
794
795 out:
796 AVG_PERF_COUNTER(priv->pstats.rx_coal_avg, polled);
797 mlx4_cq_set_ci(&cq->mcq);
798 wmb(); /* ensure HW sees CQ consumer before we post new buffers */
799 ring->cons = cq->mcq.cons_index;
800 ring->prod += polled; /* Polled descriptors were realocated in place */
801 if (unlikely(!ring->full)) {
802 mlx4_en_copy_desc(priv, ring, ring->cons - polled,
803 ring->prod - polled, polled);
804 mlx4_en_fill_rx_buf(dev, ring);
805 }
806 mlx4_en_update_rx_prod_db(ring);
807 return polled;
808 }
809
810
811 void mlx4_en_rx_irq(struct mlx4_cq *mcq)
812 {
813 struct mlx4_en_cq *cq = container_of(mcq, struct mlx4_en_cq, mcq);
814 struct mlx4_en_priv *priv = netdev_priv(cq->dev);
815
816 if (priv->port_up)
817 napi_schedule(&cq->napi);
818 else
819 mlx4_en_arm_cq(priv, cq);
820 }
821
822 /* Rx CQ polling - called by NAPI */
823 int mlx4_en_poll_rx_cq(struct napi_struct *napi, int budget)
824 {
825 struct mlx4_en_cq *cq = container_of(napi, struct mlx4_en_cq, napi);
826 struct net_device *dev = cq->dev;
827 struct mlx4_en_priv *priv = netdev_priv(dev);
828 int done;
829
830 done = mlx4_en_process_rx_cq(dev, cq, budget);
831
832 /* If we used up all the quota - we're probably not done yet... */
833 if (done == budget)
834 INC_PERF_COUNTER(priv->pstats.napi_quota);
835 else {
836 /* Done for now */
837 napi_complete(napi);
838 mlx4_en_arm_cq(priv, cq);
839 }
840 return done;
841 }
842
843
844 /* Calculate the last offset position that accomodates a full fragment
845 * (assuming fagment size = stride-align) */
846 static int mlx4_en_last_alloc_offset(struct mlx4_en_priv *priv, u16 stride, u16 align)
847 {
848 u16 res = MLX4_EN_ALLOC_SIZE % stride;
849 u16 offset = MLX4_EN_ALLOC_SIZE - stride - res + align;
850
851 mlx4_dbg(DRV, priv, "Calculated last offset for stride:%d align:%d "
852 "res:%d offset:%d\n", stride, align, res, offset);
853 return offset;
854 }
855
856
857 static int frag_sizes[] = {
858 FRAG_SZ0,
859 FRAG_SZ1,
860 FRAG_SZ2,
861 FRAG_SZ3
862 };
863
864 void mlx4_en_calc_rx_buf(struct net_device *dev)
865 {
866 struct mlx4_en_priv *priv = netdev_priv(dev);
867 int eff_mtu = dev->mtu + ETH_HLEN + VLAN_HLEN + ETH_LLC_SNAP_SIZE;
868 int buf_size = 0;
869 int i = 0;
870
871 while (buf_size < eff_mtu) {
872 priv->frag_info[i].frag_size =
873 (eff_mtu > buf_size + frag_sizes[i]) ?
874 frag_sizes[i] : eff_mtu - buf_size;
875 priv->frag_info[i].frag_prefix_size = buf_size;
876 if (!i) {
877 priv->frag_info[i].frag_align = NET_IP_ALIGN;
878 priv->frag_info[i].frag_stride =
879 ALIGN(frag_sizes[i] + NET_IP_ALIGN, SMP_CACHE_BYTES);
880 } else {
881 priv->frag_info[i].frag_align = 0;
882 priv->frag_info[i].frag_stride =
883 ALIGN(frag_sizes[i], SMP_CACHE_BYTES);
884 }
885 priv->frag_info[i].last_offset = mlx4_en_last_alloc_offset(
886 priv, priv->frag_info[i].frag_stride,
887 priv->frag_info[i].frag_align);
888 buf_size += priv->frag_info[i].frag_size;
889 i++;
890 }
891
892 priv->num_frags = i;
893 priv->rx_skb_size = eff_mtu;
894 priv->log_rx_info = ROUNDUP_LOG2(i * sizeof(struct skb_frag_struct));
895
896 mlx4_dbg(DRV, priv, "Rx buffer scatter-list (effective-mtu:%d "
897 "num_frags:%d):\n", eff_mtu, priv->num_frags);
898 for (i = 0; i < priv->num_frags; i++) {
899 mlx4_dbg(DRV, priv, " frag:%d - size:%d prefix:%d align:%d "
900 "stride:%d last_offset:%d\n", i,
901 priv->frag_info[i].frag_size,
902 priv->frag_info[i].frag_prefix_size,
903 priv->frag_info[i].frag_align,
904 priv->frag_info[i].frag_stride,
905 priv->frag_info[i].last_offset);
906 }
907 }
908
909 /* RSS related functions */
910
911 /* Calculate rss size and map each entry in rss table to rx ring */
912 void mlx4_en_set_default_rss_map(struct mlx4_en_priv *priv,
913 struct mlx4_en_rss_map *rss_map,
914 int num_entries, int num_rings)
915 {
916 int i;
917
918 rss_map->size = roundup_pow_of_two(num_entries);
919 mlx4_dbg(DRV, priv, "Setting default RSS map of %d entires\n",
920 rss_map->size);
921
922 for (i = 0; i < rss_map->size; i++) {
923 rss_map->map[i] = i % num_rings;
924 mlx4_dbg(DRV, priv, "Entry %d ---> ring %d\n", i, rss_map->map[i]);
925 }
926 }
927
928 static void mlx4_en_sqp_event(struct mlx4_qp *qp, enum mlx4_event event)
929 {
930 return;
931 }
932
933
934 static int mlx4_en_config_rss_qp(struct mlx4_en_priv *priv,
935 int qpn, int srqn, int cqn,
936 enum mlx4_qp_state *state,
937 struct mlx4_qp *qp)
938 {
939 struct mlx4_en_dev *mdev = priv->mdev;
940 struct mlx4_qp_context *context;
941 int err = 0;
942
943 context = kmalloc(sizeof *context , GFP_KERNEL);
944 if (!context) {
945 mlx4_err(mdev, "Failed to allocate qp context\n");
946 return -ENOMEM;
947 }
948
949 err = mlx4_qp_alloc(mdev->dev, qpn, qp);
950 if (err) {
951 mlx4_err(mdev, "Failed to allocate qp #%d\n", qpn);
952 goto out;
953 return err;
954 }
955 qp->event = mlx4_en_sqp_event;
956
957 memset(context, 0, sizeof *context);
958 mlx4_en_fill_qp_context(priv, 0, 0, 0, 0, qpn, cqn, srqn, context);
959
960 err = mlx4_qp_to_ready(mdev->dev, &priv->res.mtt, context, qp, state);
961 if (err) {
962 mlx4_qp_remove(mdev->dev, qp);
963 mlx4_qp_free(mdev->dev, qp);
964 }
965 out:
966 kfree(context);
967 return err;
968 }
969
970 /* Allocate rx qp's and configure them according to rss map */
971 int mlx4_en_config_rss_steer(struct mlx4_en_priv *priv)
972 {
973 struct mlx4_en_dev *mdev = priv->mdev;
974 struct mlx4_en_rss_map *rss_map = &priv->rss_map;
975 struct mlx4_qp_context context;
976 struct mlx4_en_rss_context *rss_context;
977 void *ptr;
978 int rss_xor = mdev->profile.rss_xor;
979 u8 rss_mask = mdev->profile.rss_mask;
980 int i, srqn, qpn, cqn;
981 int err = 0;
982 int good_qps = 0;
983
984 mlx4_dbg(DRV, priv, "Configuring rss steering for port %u\n", priv->port);
985 err = mlx4_qp_reserve_range(mdev->dev, rss_map->size,
986 rss_map->size, &rss_map->base_qpn);
987 if (err) {
988 mlx4_err(mdev, "Failed reserving %d qps for port %u\n",
989 rss_map->size, priv->port);
990 return err;
991 }
992
993 for (i = 0; i < rss_map->size; i++) {
994 cqn = priv->rx_ring[rss_map->map[i]].cqn;
995 srqn = priv->rx_ring[rss_map->map[i]].srq.srqn;
996 qpn = rss_map->base_qpn + i;
997 err = mlx4_en_config_rss_qp(priv, qpn, srqn, cqn,
998 &rss_map->state[i],
999 &rss_map->qps[i]);
1000 if (err)
1001 goto rss_err;
1002
1003 ++good_qps;
1004 }
1005
1006 /* Configure RSS indirection qp */
1007 err = mlx4_qp_reserve_range(mdev->dev, 1, 1, &priv->base_qpn);
1008 if (err) {
1009 mlx4_err(mdev, "Failed to reserve range for RSS "
1010 "indirection qp\n");
1011 goto rss_err;
1012 }
1013 err = mlx4_qp_alloc(mdev->dev, priv->base_qpn, &rss_map->indir_qp);
1014 if (err) {
1015 mlx4_err(mdev, "Failed to allocate RSS indirection QP\n");
1016 goto reserve_err;
1017 }
1018 rss_map->indir_qp.event = mlx4_en_sqp_event;
1019 mlx4_en_fill_qp_context(priv, 0, 0, 0, 1, priv->base_qpn,
1020 priv->rx_ring[0].cqn, 0, &context);
1021
1022 ptr = ((void *) &context) + 0x3c;
1023 rss_context = (struct mlx4_en_rss_context *) ptr;
1024 rss_context->base_qpn = cpu_to_be32(ilog2(rss_map->size) << 24 |
1025 (rss_map->base_qpn));
1026 rss_context->default_qpn = cpu_to_be32(rss_map->base_qpn);
1027 rss_context->hash_fn = rss_xor & 0x3;
1028 rss_context->flags = rss_mask << 2;
1029
1030 err = mlx4_qp_to_ready(mdev->dev, &priv->res.mtt, &context,
1031 &rss_map->indir_qp, &rss_map->indir_state);
1032 if (err)
1033 goto indir_err;
1034
1035 return 0;
1036
1037 indir_err:
1038 mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
1039 MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->indir_qp);
1040 mlx4_qp_remove(mdev->dev, &rss_map->indir_qp);
1041 mlx4_qp_free(mdev->dev, &rss_map->indir_qp);
1042 reserve_err:
1043 mlx4_qp_release_range(mdev->dev, priv->base_qpn, 1);
1044 rss_err:
1045 for (i = 0; i < good_qps; i++) {
1046 mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i],
1047 MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->qps[i]);
1048 mlx4_qp_remove(mdev->dev, &rss_map->qps[i]);
1049 mlx4_qp_free(mdev->dev, &rss_map->qps[i]);
1050 }
1051 mlx4_qp_release_range(mdev->dev, rss_map->base_qpn, rss_map->size);
1052 return err;
1053 }
1054
1055 void mlx4_en_release_rss_steer(struct mlx4_en_priv *priv)
1056 {
1057 struct mlx4_en_dev *mdev = priv->mdev;
1058 struct mlx4_en_rss_map *rss_map = &priv->rss_map;
1059 int i;
1060
1061 mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state,
1062 MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->indir_qp);
1063 mlx4_qp_remove(mdev->dev, &rss_map->indir_qp);
1064 mlx4_qp_free(mdev->dev, &rss_map->indir_qp);
1065 mlx4_qp_release_range(mdev->dev, priv->base_qpn, 1);
1066
1067 for (i = 0; i < rss_map->size; i++) {
1068 mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i],
1069 MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->qps[i]);
1070 mlx4_qp_remove(mdev->dev, &rss_map->qps[i]);
1071 mlx4_qp_free(mdev->dev, &rss_map->qps[i]);
1072 }
1073 mlx4_qp_release_range(mdev->dev, rss_map->base_qpn, rss_map->size);
1074 }
1075
1076
1077
1078
1079
Linux kernel - Deliverables
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