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c27a02cd YP |
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> | |
5a0e3ad6 | 35 | #include <linux/slab.h> |
c27a02cd YP |
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 | ||
c27a02cd | 44 | |
c27a02cd YP |
45 | static int mlx4_en_alloc_frag(struct mlx4_en_priv *priv, |
46 | struct mlx4_en_rx_desc *rx_desc, | |
47 | struct skb_frag_struct *skb_frags, | |
48 | struct mlx4_en_rx_alloc *ring_alloc, | |
49 | int i) | |
50 | { | |
51 | struct mlx4_en_dev *mdev = priv->mdev; | |
52 | struct mlx4_en_frag_info *frag_info = &priv->frag_info[i]; | |
53 | struct mlx4_en_rx_alloc *page_alloc = &ring_alloc[i]; | |
54 | struct page *page; | |
55 | dma_addr_t dma; | |
56 | ||
57 | if (page_alloc->offset == frag_info->last_offset) { | |
58 | /* Allocate new page */ | |
59 | page = alloc_pages(GFP_ATOMIC | __GFP_COMP, MLX4_EN_ALLOC_ORDER); | |
60 | if (!page) | |
61 | return -ENOMEM; | |
62 | ||
63 | skb_frags[i].page = page_alloc->page; | |
64 | skb_frags[i].page_offset = page_alloc->offset; | |
65 | page_alloc->page = page; | |
66 | page_alloc->offset = frag_info->frag_align; | |
67 | } else { | |
68 | page = page_alloc->page; | |
69 | get_page(page); | |
70 | ||
71 | skb_frags[i].page = page; | |
72 | skb_frags[i].page_offset = page_alloc->offset; | |
73 | page_alloc->offset += frag_info->frag_stride; | |
74 | } | |
75 | dma = pci_map_single(mdev->pdev, page_address(skb_frags[i].page) + | |
76 | skb_frags[i].page_offset, frag_info->frag_size, | |
77 | PCI_DMA_FROMDEVICE); | |
78 | rx_desc->data[i].addr = cpu_to_be64(dma); | |
79 | return 0; | |
80 | } | |
81 | ||
82 | static int mlx4_en_init_allocator(struct mlx4_en_priv *priv, | |
83 | struct mlx4_en_rx_ring *ring) | |
84 | { | |
85 | struct mlx4_en_rx_alloc *page_alloc; | |
86 | int i; | |
87 | ||
88 | for (i = 0; i < priv->num_frags; i++) { | |
89 | page_alloc = &ring->page_alloc[i]; | |
90 | page_alloc->page = alloc_pages(GFP_ATOMIC | __GFP_COMP, | |
91 | MLX4_EN_ALLOC_ORDER); | |
92 | if (!page_alloc->page) | |
93 | goto out; | |
94 | ||
95 | page_alloc->offset = priv->frag_info[i].frag_align; | |
453a6082 YP |
96 | en_dbg(DRV, priv, "Initialized allocator:%d with page:%p\n", |
97 | i, page_alloc->page); | |
c27a02cd YP |
98 | } |
99 | return 0; | |
100 | ||
101 | out: | |
102 | while (i--) { | |
103 | page_alloc = &ring->page_alloc[i]; | |
104 | put_page(page_alloc->page); | |
105 | page_alloc->page = NULL; | |
106 | } | |
107 | return -ENOMEM; | |
108 | } | |
109 | ||
110 | static void mlx4_en_destroy_allocator(struct mlx4_en_priv *priv, | |
111 | struct mlx4_en_rx_ring *ring) | |
112 | { | |
113 | struct mlx4_en_rx_alloc *page_alloc; | |
114 | int i; | |
115 | ||
116 | for (i = 0; i < priv->num_frags; i++) { | |
117 | page_alloc = &ring->page_alloc[i]; | |
453a6082 YP |
118 | en_dbg(DRV, priv, "Freeing allocator:%d count:%d\n", |
119 | i, page_count(page_alloc->page)); | |
c27a02cd YP |
120 | |
121 | put_page(page_alloc->page); | |
122 | page_alloc->page = NULL; | |
123 | } | |
124 | } | |
125 | ||
126 | ||
127 | static void mlx4_en_init_rx_desc(struct mlx4_en_priv *priv, | |
128 | struct mlx4_en_rx_ring *ring, int index) | |
129 | { | |
130 | struct mlx4_en_rx_desc *rx_desc = ring->buf + ring->stride * index; | |
131 | struct skb_frag_struct *skb_frags = ring->rx_info + | |
132 | (index << priv->log_rx_info); | |
133 | int possible_frags; | |
134 | int i; | |
135 | ||
c27a02cd YP |
136 | /* Set size and memtype fields */ |
137 | for (i = 0; i < priv->num_frags; i++) { | |
138 | skb_frags[i].size = priv->frag_info[i].frag_size; | |
139 | rx_desc->data[i].byte_count = | |
140 | cpu_to_be32(priv->frag_info[i].frag_size); | |
141 | rx_desc->data[i].lkey = cpu_to_be32(priv->mdev->mr.key); | |
142 | } | |
143 | ||
144 | /* If the number of used fragments does not fill up the ring stride, | |
145 | * remaining (unused) fragments must be padded with null address/size | |
146 | * and a special memory key */ | |
147 | possible_frags = (ring->stride - sizeof(struct mlx4_en_rx_desc)) / DS_SIZE; | |
148 | for (i = priv->num_frags; i < possible_frags; i++) { | |
149 | rx_desc->data[i].byte_count = 0; | |
150 | rx_desc->data[i].lkey = cpu_to_be32(MLX4_EN_MEMTYPE_PAD); | |
151 | rx_desc->data[i].addr = 0; | |
152 | } | |
153 | } | |
154 | ||
155 | ||
156 | static int mlx4_en_prepare_rx_desc(struct mlx4_en_priv *priv, | |
157 | struct mlx4_en_rx_ring *ring, int index) | |
158 | { | |
159 | struct mlx4_en_rx_desc *rx_desc = ring->buf + (index * ring->stride); | |
160 | struct skb_frag_struct *skb_frags = ring->rx_info + | |
161 | (index << priv->log_rx_info); | |
162 | int i; | |
163 | ||
164 | for (i = 0; i < priv->num_frags; i++) | |
165 | if (mlx4_en_alloc_frag(priv, rx_desc, skb_frags, ring->page_alloc, i)) | |
166 | goto err; | |
167 | ||
168 | return 0; | |
169 | ||
170 | err: | |
171 | while (i--) | |
172 | put_page(skb_frags[i].page); | |
173 | return -ENOMEM; | |
174 | } | |
175 | ||
176 | static inline void mlx4_en_update_rx_prod_db(struct mlx4_en_rx_ring *ring) | |
177 | { | |
178 | *ring->wqres.db.db = cpu_to_be32(ring->prod & 0xffff); | |
179 | } | |
180 | ||
38aab07c YP |
181 | static void mlx4_en_free_rx_desc(struct mlx4_en_priv *priv, |
182 | struct mlx4_en_rx_ring *ring, | |
183 | int index) | |
184 | { | |
185 | struct mlx4_en_dev *mdev = priv->mdev; | |
186 | struct skb_frag_struct *skb_frags; | |
187 | struct mlx4_en_rx_desc *rx_desc = ring->buf + (index << ring->log_stride); | |
188 | dma_addr_t dma; | |
189 | int nr; | |
190 | ||
191 | skb_frags = ring->rx_info + (index << priv->log_rx_info); | |
192 | for (nr = 0; nr < priv->num_frags; nr++) { | |
453a6082 | 193 | en_dbg(DRV, priv, "Freeing fragment:%d\n", nr); |
38aab07c YP |
194 | dma = be64_to_cpu(rx_desc->data[nr].addr); |
195 | ||
af901ca1 | 196 | en_dbg(DRV, priv, "Unmapping buffer at dma:0x%llx\n", (u64) dma); |
38aab07c YP |
197 | pci_unmap_single(mdev->pdev, dma, skb_frags[nr].size, |
198 | PCI_DMA_FROMDEVICE); | |
199 | put_page(skb_frags[nr].page); | |
200 | } | |
201 | } | |
202 | ||
c27a02cd YP |
203 | static int mlx4_en_fill_rx_buffers(struct mlx4_en_priv *priv) |
204 | { | |
c27a02cd YP |
205 | struct mlx4_en_rx_ring *ring; |
206 | int ring_ind; | |
207 | int buf_ind; | |
38aab07c | 208 | int new_size; |
c27a02cd YP |
209 | |
210 | for (buf_ind = 0; buf_ind < priv->prof->rx_ring_size; buf_ind++) { | |
211 | for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) { | |
212 | ring = &priv->rx_ring[ring_ind]; | |
213 | ||
214 | if (mlx4_en_prepare_rx_desc(priv, ring, | |
215 | ring->actual_size)) { | |
216 | if (ring->actual_size < MLX4_EN_MIN_RX_SIZE) { | |
453a6082 YP |
217 | en_err(priv, "Failed to allocate " |
218 | "enough rx buffers\n"); | |
c27a02cd YP |
219 | return -ENOMEM; |
220 | } else { | |
38aab07c | 221 | new_size = rounddown_pow_of_two(ring->actual_size); |
453a6082 YP |
222 | en_warn(priv, "Only %d buffers allocated " |
223 | "reducing ring size to %d", | |
224 | ring->actual_size, new_size); | |
38aab07c | 225 | goto reduce_rings; |
c27a02cd YP |
226 | } |
227 | } | |
228 | ring->actual_size++; | |
229 | ring->prod++; | |
230 | } | |
231 | } | |
38aab07c YP |
232 | return 0; |
233 | ||
234 | reduce_rings: | |
235 | for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) { | |
236 | ring = &priv->rx_ring[ring_ind]; | |
237 | while (ring->actual_size > new_size) { | |
238 | ring->actual_size--; | |
239 | ring->prod--; | |
240 | mlx4_en_free_rx_desc(priv, ring, ring->actual_size); | |
241 | } | |
38aab07c YP |
242 | } |
243 | ||
c27a02cd YP |
244 | return 0; |
245 | } | |
246 | ||
c27a02cd YP |
247 | static void mlx4_en_free_rx_buf(struct mlx4_en_priv *priv, |
248 | struct mlx4_en_rx_ring *ring) | |
249 | { | |
c27a02cd | 250 | int index; |
c27a02cd | 251 | |
453a6082 YP |
252 | en_dbg(DRV, priv, "Freeing Rx buf - cons:%d prod:%d\n", |
253 | ring->cons, ring->prod); | |
c27a02cd YP |
254 | |
255 | /* Unmap and free Rx buffers */ | |
38aab07c | 256 | BUG_ON((u32) (ring->prod - ring->cons) > ring->actual_size); |
c27a02cd YP |
257 | while (ring->cons != ring->prod) { |
258 | index = ring->cons & ring->size_mask; | |
453a6082 | 259 | en_dbg(DRV, priv, "Processing descriptor:%d\n", index); |
38aab07c | 260 | mlx4_en_free_rx_desc(priv, ring, index); |
c27a02cd YP |
261 | ++ring->cons; |
262 | } | |
263 | } | |
264 | ||
c27a02cd YP |
265 | int mlx4_en_create_rx_ring(struct mlx4_en_priv *priv, |
266 | struct mlx4_en_rx_ring *ring, u32 size, u16 stride) | |
267 | { | |
268 | struct mlx4_en_dev *mdev = priv->mdev; | |
269 | int err; | |
270 | int tmp; | |
271 | ||
c27a02cd YP |
272 | |
273 | ring->prod = 0; | |
274 | ring->cons = 0; | |
275 | ring->size = size; | |
276 | ring->size_mask = size - 1; | |
277 | ring->stride = stride; | |
278 | ring->log_stride = ffs(ring->stride) - 1; | |
9f519f68 | 279 | ring->buf_size = ring->size * ring->stride + TXBB_SIZE; |
c27a02cd YP |
280 | |
281 | tmp = size * roundup_pow_of_two(MLX4_EN_MAX_RX_FRAGS * | |
282 | sizeof(struct skb_frag_struct)); | |
283 | ring->rx_info = vmalloc(tmp); | |
284 | if (!ring->rx_info) { | |
453a6082 | 285 | en_err(priv, "Failed allocating rx_info ring\n"); |
c27a02cd YP |
286 | return -ENOMEM; |
287 | } | |
453a6082 | 288 | en_dbg(DRV, priv, "Allocated rx_info ring at addr:%p size:%d\n", |
c27a02cd YP |
289 | ring->rx_info, tmp); |
290 | ||
291 | err = mlx4_alloc_hwq_res(mdev->dev, &ring->wqres, | |
292 | ring->buf_size, 2 * PAGE_SIZE); | |
293 | if (err) | |
294 | goto err_ring; | |
295 | ||
296 | err = mlx4_en_map_buffer(&ring->wqres.buf); | |
297 | if (err) { | |
453a6082 | 298 | en_err(priv, "Failed to map RX buffer\n"); |
c27a02cd YP |
299 | goto err_hwq; |
300 | } | |
301 | ring->buf = ring->wqres.buf.direct.buf; | |
302 | ||
c27a02cd YP |
303 | return 0; |
304 | ||
c27a02cd YP |
305 | err_hwq: |
306 | mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size); | |
307 | err_ring: | |
308 | vfree(ring->rx_info); | |
309 | ring->rx_info = NULL; | |
310 | return err; | |
311 | } | |
312 | ||
313 | int mlx4_en_activate_rx_rings(struct mlx4_en_priv *priv) | |
314 | { | |
c27a02cd YP |
315 | struct mlx4_en_rx_ring *ring; |
316 | int i; | |
317 | int ring_ind; | |
318 | int err; | |
319 | int stride = roundup_pow_of_two(sizeof(struct mlx4_en_rx_desc) + | |
320 | DS_SIZE * priv->num_frags); | |
c27a02cd YP |
321 | |
322 | for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) { | |
323 | ring = &priv->rx_ring[ring_ind]; | |
324 | ||
325 | ring->prod = 0; | |
326 | ring->cons = 0; | |
327 | ring->actual_size = 0; | |
328 | ring->cqn = priv->rx_cq[ring_ind].mcq.cqn; | |
329 | ||
330 | ring->stride = stride; | |
9f519f68 YP |
331 | if (ring->stride <= TXBB_SIZE) |
332 | ring->buf += TXBB_SIZE; | |
333 | ||
c27a02cd YP |
334 | ring->log_stride = ffs(ring->stride) - 1; |
335 | ring->buf_size = ring->size * ring->stride; | |
336 | ||
337 | memset(ring->buf, 0, ring->buf_size); | |
338 | mlx4_en_update_rx_prod_db(ring); | |
339 | ||
340 | /* Initailize all descriptors */ | |
341 | for (i = 0; i < ring->size; i++) | |
342 | mlx4_en_init_rx_desc(priv, ring, i); | |
343 | ||
344 | /* Initialize page allocators */ | |
345 | err = mlx4_en_init_allocator(priv, ring); | |
346 | if (err) { | |
453a6082 | 347 | en_err(priv, "Failed initializing ring allocator\n"); |
9a4f92a6 YP |
348 | ring_ind--; |
349 | goto err_allocator; | |
c27a02cd | 350 | } |
c27a02cd | 351 | } |
b58515be IM |
352 | err = mlx4_en_fill_rx_buffers(priv); |
353 | if (err) | |
c27a02cd YP |
354 | goto err_buffers; |
355 | ||
356 | for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) { | |
357 | ring = &priv->rx_ring[ring_ind]; | |
358 | ||
00d7d7bc | 359 | ring->size_mask = ring->actual_size - 1; |
c27a02cd | 360 | mlx4_en_update_rx_prod_db(ring); |
c27a02cd YP |
361 | } |
362 | ||
363 | return 0; | |
364 | ||
c27a02cd YP |
365 | err_buffers: |
366 | for (ring_ind = 0; ring_ind < priv->rx_ring_num; ring_ind++) | |
367 | mlx4_en_free_rx_buf(priv, &priv->rx_ring[ring_ind]); | |
368 | ||
369 | ring_ind = priv->rx_ring_num - 1; | |
370 | err_allocator: | |
371 | while (ring_ind >= 0) { | |
372 | mlx4_en_destroy_allocator(priv, &priv->rx_ring[ring_ind]); | |
373 | ring_ind--; | |
374 | } | |
375 | return err; | |
376 | } | |
377 | ||
378 | void mlx4_en_destroy_rx_ring(struct mlx4_en_priv *priv, | |
379 | struct mlx4_en_rx_ring *ring) | |
380 | { | |
381 | struct mlx4_en_dev *mdev = priv->mdev; | |
382 | ||
c27a02cd | 383 | mlx4_en_unmap_buffer(&ring->wqres.buf); |
9f519f68 | 384 | mlx4_free_hwq_res(mdev->dev, &ring->wqres, ring->buf_size + TXBB_SIZE); |
c27a02cd YP |
385 | vfree(ring->rx_info); |
386 | ring->rx_info = NULL; | |
387 | } | |
388 | ||
389 | void mlx4_en_deactivate_rx_ring(struct mlx4_en_priv *priv, | |
390 | struct mlx4_en_rx_ring *ring) | |
391 | { | |
c27a02cd | 392 | mlx4_en_free_rx_buf(priv, ring); |
9f519f68 YP |
393 | if (ring->stride <= TXBB_SIZE) |
394 | ring->buf -= TXBB_SIZE; | |
c27a02cd YP |
395 | mlx4_en_destroy_allocator(priv, ring); |
396 | } | |
397 | ||
398 | ||
399 | /* Unmap a completed descriptor and free unused pages */ | |
400 | static int mlx4_en_complete_rx_desc(struct mlx4_en_priv *priv, | |
401 | struct mlx4_en_rx_desc *rx_desc, | |
402 | struct skb_frag_struct *skb_frags, | |
403 | struct skb_frag_struct *skb_frags_rx, | |
404 | struct mlx4_en_rx_alloc *page_alloc, | |
405 | int length) | |
406 | { | |
407 | struct mlx4_en_dev *mdev = priv->mdev; | |
408 | struct mlx4_en_frag_info *frag_info; | |
409 | int nr; | |
410 | dma_addr_t dma; | |
411 | ||
412 | /* Collect used fragments while replacing them in the HW descirptors */ | |
413 | for (nr = 0; nr < priv->num_frags; nr++) { | |
414 | frag_info = &priv->frag_info[nr]; | |
415 | if (length <= frag_info->frag_prefix_size) | |
416 | break; | |
417 | ||
418 | /* Save page reference in skb */ | |
419 | skb_frags_rx[nr].page = skb_frags[nr].page; | |
420 | skb_frags_rx[nr].size = skb_frags[nr].size; | |
421 | skb_frags_rx[nr].page_offset = skb_frags[nr].page_offset; | |
422 | dma = be64_to_cpu(rx_desc->data[nr].addr); | |
423 | ||
424 | /* Allocate a replacement page */ | |
425 | if (mlx4_en_alloc_frag(priv, rx_desc, skb_frags, page_alloc, nr)) | |
426 | goto fail; | |
427 | ||
428 | /* Unmap buffer */ | |
69351a29 | 429 | pci_unmap_single(mdev->pdev, dma, skb_frags_rx[nr].size, |
c27a02cd YP |
430 | PCI_DMA_FROMDEVICE); |
431 | } | |
432 | /* Adjust size of last fragment to match actual length */ | |
973507cb | 433 | if (nr > 0) |
434 | skb_frags_rx[nr - 1].size = length - | |
435 | priv->frag_info[nr - 1].frag_prefix_size; | |
c27a02cd YP |
436 | return nr; |
437 | ||
438 | fail: | |
439 | /* Drop all accumulated fragments (which have already been replaced in | |
440 | * the descriptor) of this packet; remaining fragments are reused... */ | |
441 | while (nr > 0) { | |
442 | nr--; | |
443 | put_page(skb_frags_rx[nr].page); | |
444 | } | |
445 | return 0; | |
446 | } | |
447 | ||
448 | ||
449 | static struct sk_buff *mlx4_en_rx_skb(struct mlx4_en_priv *priv, | |
450 | struct mlx4_en_rx_desc *rx_desc, | |
451 | struct skb_frag_struct *skb_frags, | |
452 | struct mlx4_en_rx_alloc *page_alloc, | |
453 | unsigned int length) | |
454 | { | |
455 | struct mlx4_en_dev *mdev = priv->mdev; | |
456 | struct sk_buff *skb; | |
457 | void *va; | |
458 | int used_frags; | |
459 | dma_addr_t dma; | |
460 | ||
461 | skb = dev_alloc_skb(SMALL_PACKET_SIZE + NET_IP_ALIGN); | |
462 | if (!skb) { | |
453a6082 | 463 | en_dbg(RX_ERR, priv, "Failed allocating skb\n"); |
c27a02cd YP |
464 | return NULL; |
465 | } | |
466 | skb->dev = priv->dev; | |
467 | skb_reserve(skb, NET_IP_ALIGN); | |
468 | skb->len = length; | |
469 | skb->truesize = length + sizeof(struct sk_buff); | |
470 | ||
471 | /* Get pointer to first fragment so we could copy the headers into the | |
472 | * (linear part of the) skb */ | |
473 | va = page_address(skb_frags[0].page) + skb_frags[0].page_offset; | |
474 | ||
475 | if (length <= SMALL_PACKET_SIZE) { | |
476 | /* We are copying all relevant data to the skb - temporarily | |
477 | * synch buffers for the copy */ | |
478 | dma = be64_to_cpu(rx_desc->data[0].addr); | |
e4fc8560 FT |
479 | dma_sync_single_for_cpu(&mdev->pdev->dev, dma, length, |
480 | DMA_FROM_DEVICE); | |
c27a02cd | 481 | skb_copy_to_linear_data(skb, va, length); |
e4fc8560 FT |
482 | dma_sync_single_for_device(&mdev->pdev->dev, dma, length, |
483 | DMA_FROM_DEVICE); | |
c27a02cd YP |
484 | skb->tail += length; |
485 | } else { | |
486 | ||
487 | /* Move relevant fragments to skb */ | |
488 | used_frags = mlx4_en_complete_rx_desc(priv, rx_desc, skb_frags, | |
489 | skb_shinfo(skb)->frags, | |
490 | page_alloc, length); | |
785a0982 YP |
491 | if (unlikely(!used_frags)) { |
492 | kfree_skb(skb); | |
493 | return NULL; | |
494 | } | |
c27a02cd YP |
495 | skb_shinfo(skb)->nr_frags = used_frags; |
496 | ||
497 | /* Copy headers into the skb linear buffer */ | |
498 | memcpy(skb->data, va, HEADER_COPY_SIZE); | |
499 | skb->tail += HEADER_COPY_SIZE; | |
500 | ||
501 | /* Skip headers in first fragment */ | |
502 | skb_shinfo(skb)->frags[0].page_offset += HEADER_COPY_SIZE; | |
503 | ||
504 | /* Adjust size of first fragment */ | |
505 | skb_shinfo(skb)->frags[0].size -= HEADER_COPY_SIZE; | |
506 | skb->data_len = length - HEADER_COPY_SIZE; | |
507 | } | |
508 | return skb; | |
509 | } | |
510 | ||
e7c1c2c4 YP |
511 | static void validate_loopback(struct mlx4_en_priv *priv, struct sk_buff *skb) |
512 | { | |
513 | int i; | |
514 | int offset = ETH_HLEN; | |
515 | ||
516 | for (i = 0; i < MLX4_LOOPBACK_TEST_PAYLOAD; i++, offset++) { | |
517 | if (*(skb->data + offset) != (unsigned char) (i & 0xff)) | |
518 | goto out_loopback; | |
519 | } | |
520 | /* Loopback found */ | |
521 | priv->loopback_ok = 1; | |
522 | ||
523 | out_loopback: | |
524 | dev_kfree_skb_any(skb); | |
525 | } | |
c27a02cd YP |
526 | |
527 | int mlx4_en_process_rx_cq(struct net_device *dev, struct mlx4_en_cq *cq, int budget) | |
528 | { | |
529 | struct mlx4_en_priv *priv = netdev_priv(dev); | |
c27a02cd YP |
530 | struct mlx4_cqe *cqe; |
531 | struct mlx4_en_rx_ring *ring = &priv->rx_ring[cq->ring]; | |
532 | struct skb_frag_struct *skb_frags; | |
c27a02cd YP |
533 | struct mlx4_en_rx_desc *rx_desc; |
534 | struct sk_buff *skb; | |
535 | int index; | |
536 | int nr; | |
537 | unsigned int length; | |
538 | int polled = 0; | |
539 | int ip_summed; | |
540 | ||
541 | if (!priv->port_up) | |
542 | return 0; | |
543 | ||
544 | /* We assume a 1:1 mapping between CQEs and Rx descriptors, so Rx | |
545 | * descriptor offset can be deduced from the CQE index instead of | |
546 | * reading 'cqe->index' */ | |
547 | index = cq->mcq.cons_index & ring->size_mask; | |
548 | cqe = &cq->buf[index]; | |
549 | ||
550 | /* Process all completed CQEs */ | |
551 | while (XNOR(cqe->owner_sr_opcode & MLX4_CQE_OWNER_MASK, | |
552 | cq->mcq.cons_index & cq->size)) { | |
553 | ||
554 | skb_frags = ring->rx_info + (index << priv->log_rx_info); | |
555 | rx_desc = ring->buf + (index << ring->log_stride); | |
556 | ||
557 | /* | |
558 | * make sure we read the CQE after we read the ownership bit | |
559 | */ | |
560 | rmb(); | |
561 | ||
562 | /* Drop packet on bad receive or bad checksum */ | |
563 | if (unlikely((cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) == | |
564 | MLX4_CQE_OPCODE_ERROR)) { | |
453a6082 | 565 | en_err(priv, "CQE completed in error - vendor " |
c27a02cd YP |
566 | "syndrom:%d syndrom:%d\n", |
567 | ((struct mlx4_err_cqe *) cqe)->vendor_err_syndrome, | |
568 | ((struct mlx4_err_cqe *) cqe)->syndrome); | |
569 | goto next; | |
570 | } | |
571 | if (unlikely(cqe->badfcs_enc & MLX4_CQE_BAD_FCS)) { | |
453a6082 | 572 | en_dbg(RX_ERR, priv, "Accepted frame with bad FCS\n"); |
c27a02cd YP |
573 | goto next; |
574 | } | |
575 | ||
576 | /* | |
577 | * Packet is OK - process it. | |
578 | */ | |
579 | length = be32_to_cpu(cqe->byte_cnt); | |
580 | ring->bytes += length; | |
581 | ring->packets++; | |
582 | ||
583 | if (likely(priv->rx_csum)) { | |
584 | if ((cqe->status & cpu_to_be16(MLX4_CQE_STATUS_IPOK)) && | |
585 | (cqe->checksum == cpu_to_be16(0xffff))) { | |
586 | priv->port_stats.rx_chksum_good++; | |
587 | /* This packet is eligible for LRO if it is: | |
588 | * - DIX Ethernet (type interpretation) | |
589 | * - TCP/IP (v4) | |
590 | * - without IP options | |
591 | * - not an IP fragment */ | |
fa37a958 YP |
592 | if (dev->features & NETIF_F_GRO) { |
593 | struct sk_buff *gro_skb = napi_get_frags(&cq->napi); | |
ebc872c7 YP |
594 | if (!gro_skb) |
595 | goto next; | |
c27a02cd YP |
596 | |
597 | nr = mlx4_en_complete_rx_desc( | |
598 | priv, rx_desc, | |
fa37a958 | 599 | skb_frags, skb_shinfo(gro_skb)->frags, |
c27a02cd YP |
600 | ring->page_alloc, length); |
601 | if (!nr) | |
602 | goto next; | |
603 | ||
fa37a958 YP |
604 | skb_shinfo(gro_skb)->nr_frags = nr; |
605 | gro_skb->len = length; | |
606 | gro_skb->data_len = length; | |
607 | gro_skb->truesize += length; | |
608 | gro_skb->ip_summed = CHECKSUM_UNNECESSARY; | |
609 | ||
c27a02cd | 610 | if (priv->vlgrp && (cqe->vlan_my_qpn & |
fa37a958 YP |
611 | cpu_to_be32(MLX4_CQE_VLAN_PRESENT_MASK))) |
612 | vlan_gro_frags(&cq->napi, priv->vlgrp, be16_to_cpu(cqe->sl_vid)); | |
613 | else | |
614 | napi_gro_frags(&cq->napi); | |
c27a02cd YP |
615 | |
616 | goto next; | |
617 | } | |
618 | ||
619 | /* LRO not possible, complete processing here */ | |
620 | ip_summed = CHECKSUM_UNNECESSARY; | |
c27a02cd YP |
621 | } else { |
622 | ip_summed = CHECKSUM_NONE; | |
623 | priv->port_stats.rx_chksum_none++; | |
624 | } | |
625 | } else { | |
626 | ip_summed = CHECKSUM_NONE; | |
627 | priv->port_stats.rx_chksum_none++; | |
628 | } | |
629 | ||
630 | skb = mlx4_en_rx_skb(priv, rx_desc, skb_frags, | |
631 | ring->page_alloc, length); | |
632 | if (!skb) { | |
633 | priv->stats.rx_dropped++; | |
634 | goto next; | |
635 | } | |
636 | ||
e7c1c2c4 YP |
637 | if (unlikely(priv->validate_loopback)) { |
638 | validate_loopback(priv, skb); | |
639 | goto next; | |
640 | } | |
641 | ||
c27a02cd YP |
642 | skb->ip_summed = ip_summed; |
643 | skb->protocol = eth_type_trans(skb, dev); | |
0c8dfc83 | 644 | skb_record_rx_queue(skb, cq->ring); |
c27a02cd YP |
645 | |
646 | /* Push it up the stack */ | |
647 | if (priv->vlgrp && (be32_to_cpu(cqe->vlan_my_qpn) & | |
648 | MLX4_CQE_VLAN_PRESENT_MASK)) { | |
649 | vlan_hwaccel_receive_skb(skb, priv->vlgrp, | |
650 | be16_to_cpu(cqe->sl_vid)); | |
651 | } else | |
652 | netif_receive_skb(skb); | |
653 | ||
c27a02cd YP |
654 | next: |
655 | ++cq->mcq.cons_index; | |
656 | index = (cq->mcq.cons_index) & ring->size_mask; | |
657 | cqe = &cq->buf[index]; | |
658 | if (++polled == budget) { | |
659 | /* We are here because we reached the NAPI budget - | |
660 | * flush only pending LRO sessions */ | |
c27a02cd YP |
661 | goto out; |
662 | } | |
663 | } | |
664 | ||
c27a02cd YP |
665 | out: |
666 | AVG_PERF_COUNTER(priv->pstats.rx_coal_avg, polled); | |
667 | mlx4_cq_set_ci(&cq->mcq); | |
668 | wmb(); /* ensure HW sees CQ consumer before we post new buffers */ | |
669 | ring->cons = cq->mcq.cons_index; | |
670 | ring->prod += polled; /* Polled descriptors were realocated in place */ | |
c27a02cd YP |
671 | mlx4_en_update_rx_prod_db(ring); |
672 | return polled; | |
673 | } | |
674 | ||
675 | ||
676 | void mlx4_en_rx_irq(struct mlx4_cq *mcq) | |
677 | { | |
678 | struct mlx4_en_cq *cq = container_of(mcq, struct mlx4_en_cq, mcq); | |
679 | struct mlx4_en_priv *priv = netdev_priv(cq->dev); | |
680 | ||
681 | if (priv->port_up) | |
288379f0 | 682 | napi_schedule(&cq->napi); |
c27a02cd YP |
683 | else |
684 | mlx4_en_arm_cq(priv, cq); | |
685 | } | |
686 | ||
687 | /* Rx CQ polling - called by NAPI */ | |
688 | int mlx4_en_poll_rx_cq(struct napi_struct *napi, int budget) | |
689 | { | |
690 | struct mlx4_en_cq *cq = container_of(napi, struct mlx4_en_cq, napi); | |
691 | struct net_device *dev = cq->dev; | |
692 | struct mlx4_en_priv *priv = netdev_priv(dev); | |
693 | int done; | |
694 | ||
695 | done = mlx4_en_process_rx_cq(dev, cq, budget); | |
696 | ||
697 | /* If we used up all the quota - we're probably not done yet... */ | |
698 | if (done == budget) | |
699 | INC_PERF_COUNTER(priv->pstats.napi_quota); | |
700 | else { | |
701 | /* Done for now */ | |
288379f0 | 702 | napi_complete(napi); |
c27a02cd YP |
703 | mlx4_en_arm_cq(priv, cq); |
704 | } | |
705 | return done; | |
706 | } | |
707 | ||
708 | ||
709 | /* Calculate the last offset position that accomodates a full fragment | |
710 | * (assuming fagment size = stride-align) */ | |
711 | static int mlx4_en_last_alloc_offset(struct mlx4_en_priv *priv, u16 stride, u16 align) | |
712 | { | |
713 | u16 res = MLX4_EN_ALLOC_SIZE % stride; | |
714 | u16 offset = MLX4_EN_ALLOC_SIZE - stride - res + align; | |
715 | ||
453a6082 | 716 | en_dbg(DRV, priv, "Calculated last offset for stride:%d align:%d " |
c27a02cd YP |
717 | "res:%d offset:%d\n", stride, align, res, offset); |
718 | return offset; | |
719 | } | |
720 | ||
721 | ||
722 | static int frag_sizes[] = { | |
723 | FRAG_SZ0, | |
724 | FRAG_SZ1, | |
725 | FRAG_SZ2, | |
726 | FRAG_SZ3 | |
727 | }; | |
728 | ||
729 | void mlx4_en_calc_rx_buf(struct net_device *dev) | |
730 | { | |
731 | struct mlx4_en_priv *priv = netdev_priv(dev); | |
732 | int eff_mtu = dev->mtu + ETH_HLEN + VLAN_HLEN + ETH_LLC_SNAP_SIZE; | |
733 | int buf_size = 0; | |
734 | int i = 0; | |
735 | ||
736 | while (buf_size < eff_mtu) { | |
737 | priv->frag_info[i].frag_size = | |
738 | (eff_mtu > buf_size + frag_sizes[i]) ? | |
739 | frag_sizes[i] : eff_mtu - buf_size; | |
740 | priv->frag_info[i].frag_prefix_size = buf_size; | |
741 | if (!i) { | |
742 | priv->frag_info[i].frag_align = NET_IP_ALIGN; | |
743 | priv->frag_info[i].frag_stride = | |
744 | ALIGN(frag_sizes[i] + NET_IP_ALIGN, SMP_CACHE_BYTES); | |
745 | } else { | |
746 | priv->frag_info[i].frag_align = 0; | |
747 | priv->frag_info[i].frag_stride = | |
748 | ALIGN(frag_sizes[i], SMP_CACHE_BYTES); | |
749 | } | |
750 | priv->frag_info[i].last_offset = mlx4_en_last_alloc_offset( | |
751 | priv, priv->frag_info[i].frag_stride, | |
752 | priv->frag_info[i].frag_align); | |
753 | buf_size += priv->frag_info[i].frag_size; | |
754 | i++; | |
755 | } | |
756 | ||
757 | priv->num_frags = i; | |
758 | priv->rx_skb_size = eff_mtu; | |
759 | priv->log_rx_info = ROUNDUP_LOG2(i * sizeof(struct skb_frag_struct)); | |
760 | ||
453a6082 | 761 | en_dbg(DRV, priv, "Rx buffer scatter-list (effective-mtu:%d " |
c27a02cd YP |
762 | "num_frags:%d):\n", eff_mtu, priv->num_frags); |
763 | for (i = 0; i < priv->num_frags; i++) { | |
453a6082 | 764 | en_dbg(DRV, priv, " frag:%d - size:%d prefix:%d align:%d " |
c27a02cd YP |
765 | "stride:%d last_offset:%d\n", i, |
766 | priv->frag_info[i].frag_size, | |
767 | priv->frag_info[i].frag_prefix_size, | |
768 | priv->frag_info[i].frag_align, | |
769 | priv->frag_info[i].frag_stride, | |
770 | priv->frag_info[i].last_offset); | |
771 | } | |
772 | } | |
773 | ||
774 | /* RSS related functions */ | |
775 | ||
9f519f68 YP |
776 | static int mlx4_en_config_rss_qp(struct mlx4_en_priv *priv, int qpn, |
777 | struct mlx4_en_rx_ring *ring, | |
c27a02cd YP |
778 | enum mlx4_qp_state *state, |
779 | struct mlx4_qp *qp) | |
780 | { | |
781 | struct mlx4_en_dev *mdev = priv->mdev; | |
782 | struct mlx4_qp_context *context; | |
783 | int err = 0; | |
784 | ||
785 | context = kmalloc(sizeof *context , GFP_KERNEL); | |
786 | if (!context) { | |
453a6082 | 787 | en_err(priv, "Failed to allocate qp context\n"); |
c27a02cd YP |
788 | return -ENOMEM; |
789 | } | |
790 | ||
791 | err = mlx4_qp_alloc(mdev->dev, qpn, qp); | |
792 | if (err) { | |
453a6082 | 793 | en_err(priv, "Failed to allocate qp #%x\n", qpn); |
c27a02cd | 794 | goto out; |
c27a02cd YP |
795 | } |
796 | qp->event = mlx4_en_sqp_event; | |
797 | ||
798 | memset(context, 0, sizeof *context); | |
00d7d7bc | 799 | mlx4_en_fill_qp_context(priv, ring->actual_size, ring->stride, 0, 0, |
9f519f68 YP |
800 | qpn, ring->cqn, context); |
801 | context->db_rec_addr = cpu_to_be64(ring->wqres.db.dma); | |
c27a02cd | 802 | |
9f519f68 | 803 | err = mlx4_qp_to_ready(mdev->dev, &ring->wqres.mtt, context, qp, state); |
c27a02cd YP |
804 | if (err) { |
805 | mlx4_qp_remove(mdev->dev, qp); | |
806 | mlx4_qp_free(mdev->dev, qp); | |
807 | } | |
9f519f68 | 808 | mlx4_en_update_rx_prod_db(ring); |
c27a02cd YP |
809 | out: |
810 | kfree(context); | |
811 | return err; | |
812 | } | |
813 | ||
814 | /* Allocate rx qp's and configure them according to rss map */ | |
815 | int mlx4_en_config_rss_steer(struct mlx4_en_priv *priv) | |
816 | { | |
817 | struct mlx4_en_dev *mdev = priv->mdev; | |
818 | struct mlx4_en_rss_map *rss_map = &priv->rss_map; | |
819 | struct mlx4_qp_context context; | |
820 | struct mlx4_en_rss_context *rss_context; | |
821 | void *ptr; | |
0533943c | 822 | u8 rss_mask = 0x3f; |
9f519f68 | 823 | int i, qpn; |
c27a02cd YP |
824 | int err = 0; |
825 | int good_qps = 0; | |
826 | ||
453a6082 | 827 | en_dbg(DRV, priv, "Configuring rss steering\n"); |
b6b912e0 YP |
828 | err = mlx4_qp_reserve_range(mdev->dev, priv->rx_ring_num, |
829 | priv->rx_ring_num, | |
830 | &rss_map->base_qpn); | |
c27a02cd | 831 | if (err) { |
b6b912e0 | 832 | en_err(priv, "Failed reserving %d qps\n", priv->rx_ring_num); |
c27a02cd YP |
833 | return err; |
834 | } | |
835 | ||
b6b912e0 | 836 | for (i = 0; i < priv->rx_ring_num; i++) { |
c27a02cd | 837 | qpn = rss_map->base_qpn + i; |
9f519f68 | 838 | err = mlx4_en_config_rss_qp(priv, qpn, &priv->rx_ring[i], |
c27a02cd YP |
839 | &rss_map->state[i], |
840 | &rss_map->qps[i]); | |
841 | if (err) | |
842 | goto rss_err; | |
843 | ||
844 | ++good_qps; | |
845 | } | |
846 | ||
847 | /* Configure RSS indirection qp */ | |
848 | err = mlx4_qp_reserve_range(mdev->dev, 1, 1, &priv->base_qpn); | |
849 | if (err) { | |
453a6082 YP |
850 | en_err(priv, "Failed to reserve range for RSS " |
851 | "indirection qp\n"); | |
c27a02cd YP |
852 | goto rss_err; |
853 | } | |
854 | err = mlx4_qp_alloc(mdev->dev, priv->base_qpn, &rss_map->indir_qp); | |
855 | if (err) { | |
453a6082 | 856 | en_err(priv, "Failed to allocate RSS indirection QP\n"); |
c27a02cd YP |
857 | goto reserve_err; |
858 | } | |
859 | rss_map->indir_qp.event = mlx4_en_sqp_event; | |
860 | mlx4_en_fill_qp_context(priv, 0, 0, 0, 1, priv->base_qpn, | |
9f519f68 | 861 | priv->rx_ring[0].cqn, &context); |
c27a02cd YP |
862 | |
863 | ptr = ((void *) &context) + 0x3c; | |
864 | rss_context = (struct mlx4_en_rss_context *) ptr; | |
b6b912e0 | 865 | rss_context->base_qpn = cpu_to_be32(ilog2(priv->rx_ring_num) << 24 | |
c27a02cd YP |
866 | (rss_map->base_qpn)); |
867 | rss_context->default_qpn = cpu_to_be32(rss_map->base_qpn); | |
0533943c | 868 | rss_context->flags = rss_mask; |
c27a02cd | 869 | |
0533943c YP |
870 | if (priv->mdev->profile.udp_rss) |
871 | rss_context->base_qpn_udp = rss_context->default_qpn; | |
c27a02cd YP |
872 | err = mlx4_qp_to_ready(mdev->dev, &priv->res.mtt, &context, |
873 | &rss_map->indir_qp, &rss_map->indir_state); | |
874 | if (err) | |
875 | goto indir_err; | |
876 | ||
877 | return 0; | |
878 | ||
879 | indir_err: | |
880 | mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state, | |
881 | MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->indir_qp); | |
882 | mlx4_qp_remove(mdev->dev, &rss_map->indir_qp); | |
883 | mlx4_qp_free(mdev->dev, &rss_map->indir_qp); | |
884 | reserve_err: | |
885 | mlx4_qp_release_range(mdev->dev, priv->base_qpn, 1); | |
886 | rss_err: | |
887 | for (i = 0; i < good_qps; i++) { | |
888 | mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i], | |
889 | MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->qps[i]); | |
890 | mlx4_qp_remove(mdev->dev, &rss_map->qps[i]); | |
891 | mlx4_qp_free(mdev->dev, &rss_map->qps[i]); | |
892 | } | |
b6b912e0 | 893 | mlx4_qp_release_range(mdev->dev, rss_map->base_qpn, priv->rx_ring_num); |
c27a02cd YP |
894 | return err; |
895 | } | |
896 | ||
897 | void mlx4_en_release_rss_steer(struct mlx4_en_priv *priv) | |
898 | { | |
899 | struct mlx4_en_dev *mdev = priv->mdev; | |
900 | struct mlx4_en_rss_map *rss_map = &priv->rss_map; | |
901 | int i; | |
902 | ||
903 | mlx4_qp_modify(mdev->dev, NULL, rss_map->indir_state, | |
904 | MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->indir_qp); | |
905 | mlx4_qp_remove(mdev->dev, &rss_map->indir_qp); | |
906 | mlx4_qp_free(mdev->dev, &rss_map->indir_qp); | |
907 | mlx4_qp_release_range(mdev->dev, priv->base_qpn, 1); | |
908 | ||
b6b912e0 | 909 | for (i = 0; i < priv->rx_ring_num; i++) { |
c27a02cd YP |
910 | mlx4_qp_modify(mdev->dev, NULL, rss_map->state[i], |
911 | MLX4_QP_STATE_RST, NULL, 0, 0, &rss_map->qps[i]); | |
912 | mlx4_qp_remove(mdev->dev, &rss_map->qps[i]); | |
913 | mlx4_qp_free(mdev->dev, &rss_map->qps[i]); | |
914 | } | |
b6b912e0 | 915 | mlx4_qp_release_range(mdev->dev, rss_map->base_qpn, priv->rx_ring_num); |
c27a02cd YP |
916 | } |
917 | ||
918 | ||
919 | ||
920 | ||
921 |