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8ceee660 BH |
1 | /**************************************************************************** |
2 | * Driver for Solarflare Solarstorm network controllers and boards | |
3 | * Copyright 2005-2006 Fen Systems Ltd. | |
4 | * Copyright 2005-2008 Solarflare Communications Inc. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License version 2 as published | |
8 | * by the Free Software Foundation, incorporated herein by reference. | |
9 | */ | |
10 | ||
11 | #include <linux/socket.h> | |
12 | #include <linux/in.h> | |
13 | #include <linux/ip.h> | |
14 | #include <linux/tcp.h> | |
15 | #include <linux/udp.h> | |
16 | #include <net/ip.h> | |
17 | #include <net/checksum.h> | |
18 | #include "net_driver.h" | |
19 | #include "rx.h" | |
20 | #include "efx.h" | |
21 | #include "falcon.h" | |
3273c2e8 | 22 | #include "selftest.h" |
8ceee660 BH |
23 | #include "workarounds.h" |
24 | ||
25 | /* Number of RX descriptors pushed at once. */ | |
26 | #define EFX_RX_BATCH 8 | |
27 | ||
28 | /* Size of buffer allocated for skb header area. */ | |
29 | #define EFX_SKB_HEADERS 64u | |
30 | ||
31 | /* | |
32 | * rx_alloc_method - RX buffer allocation method | |
33 | * | |
34 | * This driver supports two methods for allocating and using RX buffers: | |
35 | * each RX buffer may be backed by an skb or by an order-n page. | |
36 | * | |
37 | * When LRO is in use then the second method has a lower overhead, | |
38 | * since we don't have to allocate then free skbs on reassembled frames. | |
39 | * | |
40 | * Values: | |
41 | * - RX_ALLOC_METHOD_AUTO = 0 | |
42 | * - RX_ALLOC_METHOD_SKB = 1 | |
43 | * - RX_ALLOC_METHOD_PAGE = 2 | |
44 | * | |
45 | * The heuristic for %RX_ALLOC_METHOD_AUTO is a simple hysteresis count | |
46 | * controlled by the parameters below. | |
47 | * | |
48 | * - Since pushing and popping descriptors are separated by the rx_queue | |
49 | * size, so the watermarks should be ~rxd_size. | |
50 | * - The performance win by using page-based allocation for LRO is less | |
51 | * than the performance hit of using page-based allocation of non-LRO, | |
52 | * so the watermarks should reflect this. | |
53 | * | |
54 | * Per channel we maintain a single variable, updated by each channel: | |
55 | * | |
56 | * rx_alloc_level += (lro_performed ? RX_ALLOC_FACTOR_LRO : | |
57 | * RX_ALLOC_FACTOR_SKB) | |
58 | * Per NAPI poll interval, we constrain rx_alloc_level to 0..MAX (which | |
59 | * limits the hysteresis), and update the allocation strategy: | |
60 | * | |
61 | * rx_alloc_method = (rx_alloc_level > RX_ALLOC_LEVEL_LRO ? | |
62 | * RX_ALLOC_METHOD_PAGE : RX_ALLOC_METHOD_SKB) | |
63 | */ | |
64 | static int rx_alloc_method = RX_ALLOC_METHOD_PAGE; | |
65 | ||
66 | #define RX_ALLOC_LEVEL_LRO 0x2000 | |
67 | #define RX_ALLOC_LEVEL_MAX 0x3000 | |
68 | #define RX_ALLOC_FACTOR_LRO 1 | |
69 | #define RX_ALLOC_FACTOR_SKB (-2) | |
70 | ||
71 | /* This is the percentage fill level below which new RX descriptors | |
72 | * will be added to the RX descriptor ring. | |
73 | */ | |
74 | static unsigned int rx_refill_threshold = 90; | |
75 | ||
76 | /* This is the percentage fill level to which an RX queue will be refilled | |
77 | * when the "RX refill threshold" is reached. | |
78 | */ | |
79 | static unsigned int rx_refill_limit = 95; | |
80 | ||
81 | /* | |
82 | * RX maximum head room required. | |
83 | * | |
84 | * This must be at least 1 to prevent overflow and at least 2 to allow | |
85 | * pipelined receives. | |
86 | */ | |
87 | #define EFX_RXD_HEAD_ROOM 2 | |
88 | ||
55668611 BH |
89 | static inline unsigned int efx_rx_buf_offset(struct efx_rx_buffer *buf) |
90 | { | |
91 | /* Offset is always within one page, so we don't need to consider | |
92 | * the page order. | |
93 | */ | |
184be0c2 | 94 | return (__force unsigned long) buf->data & (PAGE_SIZE - 1); |
55668611 BH |
95 | } |
96 | static inline unsigned int efx_rx_buf_size(struct efx_nic *efx) | |
97 | { | |
98 | return PAGE_SIZE << efx->rx_buffer_order; | |
99 | } | |
8ceee660 BH |
100 | |
101 | ||
8ceee660 BH |
102 | /** |
103 | * efx_init_rx_buffer_skb - create new RX buffer using skb-based allocation | |
104 | * | |
105 | * @rx_queue: Efx RX queue | |
106 | * @rx_buf: RX buffer structure to populate | |
107 | * | |
108 | * This allocates memory for a new receive buffer, maps it for DMA, | |
109 | * and populates a struct efx_rx_buffer with the relevant | |
110 | * information. Return a negative error code or 0 on success. | |
111 | */ | |
4d566063 BH |
112 | static int efx_init_rx_buffer_skb(struct efx_rx_queue *rx_queue, |
113 | struct efx_rx_buffer *rx_buf) | |
8ceee660 BH |
114 | { |
115 | struct efx_nic *efx = rx_queue->efx; | |
116 | struct net_device *net_dev = efx->net_dev; | |
117 | int skb_len = efx->rx_buffer_len; | |
118 | ||
119 | rx_buf->skb = netdev_alloc_skb(net_dev, skb_len); | |
120 | if (unlikely(!rx_buf->skb)) | |
121 | return -ENOMEM; | |
122 | ||
123 | /* Adjust the SKB for padding and checksum */ | |
124 | skb_reserve(rx_buf->skb, NET_IP_ALIGN); | |
125 | rx_buf->len = skb_len - NET_IP_ALIGN; | |
126 | rx_buf->data = (char *)rx_buf->skb->data; | |
127 | rx_buf->skb->ip_summed = CHECKSUM_UNNECESSARY; | |
128 | ||
129 | rx_buf->dma_addr = pci_map_single(efx->pci_dev, | |
130 | rx_buf->data, rx_buf->len, | |
131 | PCI_DMA_FROMDEVICE); | |
132 | ||
8d8bb39b | 133 | if (unlikely(pci_dma_mapping_error(efx->pci_dev, rx_buf->dma_addr))) { |
8ceee660 BH |
134 | dev_kfree_skb_any(rx_buf->skb); |
135 | rx_buf->skb = NULL; | |
136 | return -EIO; | |
137 | } | |
138 | ||
139 | return 0; | |
140 | } | |
141 | ||
142 | /** | |
143 | * efx_init_rx_buffer_page - create new RX buffer using page-based allocation | |
144 | * | |
145 | * @rx_queue: Efx RX queue | |
146 | * @rx_buf: RX buffer structure to populate | |
147 | * | |
148 | * This allocates memory for a new receive buffer, maps it for DMA, | |
149 | * and populates a struct efx_rx_buffer with the relevant | |
150 | * information. Return a negative error code or 0 on success. | |
151 | */ | |
4d566063 BH |
152 | static int efx_init_rx_buffer_page(struct efx_rx_queue *rx_queue, |
153 | struct efx_rx_buffer *rx_buf) | |
8ceee660 BH |
154 | { |
155 | struct efx_nic *efx = rx_queue->efx; | |
156 | int bytes, space, offset; | |
157 | ||
158 | bytes = efx->rx_buffer_len - EFX_PAGE_IP_ALIGN; | |
159 | ||
160 | /* If there is space left in the previously allocated page, | |
161 | * then use it. Otherwise allocate a new one */ | |
162 | rx_buf->page = rx_queue->buf_page; | |
163 | if (rx_buf->page == NULL) { | |
164 | dma_addr_t dma_addr; | |
165 | ||
166 | rx_buf->page = alloc_pages(__GFP_COLD | __GFP_COMP | GFP_ATOMIC, | |
167 | efx->rx_buffer_order); | |
168 | if (unlikely(rx_buf->page == NULL)) | |
169 | return -ENOMEM; | |
170 | ||
171 | dma_addr = pci_map_page(efx->pci_dev, rx_buf->page, | |
55668611 | 172 | 0, efx_rx_buf_size(efx), |
8ceee660 BH |
173 | PCI_DMA_FROMDEVICE); |
174 | ||
8d8bb39b | 175 | if (unlikely(pci_dma_mapping_error(efx->pci_dev, dma_addr))) { |
8ceee660 BH |
176 | __free_pages(rx_buf->page, efx->rx_buffer_order); |
177 | rx_buf->page = NULL; | |
178 | return -EIO; | |
179 | } | |
180 | ||
181 | rx_queue->buf_page = rx_buf->page; | |
182 | rx_queue->buf_dma_addr = dma_addr; | |
d3208b5e | 183 | rx_queue->buf_data = (page_address(rx_buf->page) + |
8ceee660 BH |
184 | EFX_PAGE_IP_ALIGN); |
185 | } | |
186 | ||
8ceee660 | 187 | rx_buf->len = bytes; |
8ceee660 | 188 | rx_buf->data = rx_queue->buf_data; |
184be0c2 BH |
189 | offset = efx_rx_buf_offset(rx_buf); |
190 | rx_buf->dma_addr = rx_queue->buf_dma_addr + offset; | |
8ceee660 BH |
191 | |
192 | /* Try to pack multiple buffers per page */ | |
193 | if (efx->rx_buffer_order == 0) { | |
194 | /* The next buffer starts on the next 512 byte boundary */ | |
195 | rx_queue->buf_data += ((bytes + 0x1ff) & ~0x1ff); | |
196 | offset += ((bytes + 0x1ff) & ~0x1ff); | |
197 | ||
55668611 | 198 | space = efx_rx_buf_size(efx) - offset; |
8ceee660 BH |
199 | if (space >= bytes) { |
200 | /* Refs dropped on kernel releasing each skb */ | |
201 | get_page(rx_queue->buf_page); | |
202 | goto out; | |
203 | } | |
204 | } | |
205 | ||
206 | /* This is the final RX buffer for this page, so mark it for | |
207 | * unmapping */ | |
208 | rx_queue->buf_page = NULL; | |
209 | rx_buf->unmap_addr = rx_queue->buf_dma_addr; | |
210 | ||
211 | out: | |
212 | return 0; | |
213 | } | |
214 | ||
215 | /* This allocates memory for a new receive buffer, maps it for DMA, | |
216 | * and populates a struct efx_rx_buffer with the relevant | |
217 | * information. | |
218 | */ | |
4d566063 BH |
219 | static int efx_init_rx_buffer(struct efx_rx_queue *rx_queue, |
220 | struct efx_rx_buffer *new_rx_buf) | |
8ceee660 BH |
221 | { |
222 | int rc = 0; | |
223 | ||
224 | if (rx_queue->channel->rx_alloc_push_pages) { | |
225 | new_rx_buf->skb = NULL; | |
226 | rc = efx_init_rx_buffer_page(rx_queue, new_rx_buf); | |
227 | rx_queue->alloc_page_count++; | |
228 | } else { | |
229 | new_rx_buf->page = NULL; | |
230 | rc = efx_init_rx_buffer_skb(rx_queue, new_rx_buf); | |
231 | rx_queue->alloc_skb_count++; | |
232 | } | |
233 | ||
234 | if (unlikely(rc < 0)) | |
235 | EFX_LOG_RL(rx_queue->efx, "%s RXQ[%d] =%d\n", __func__, | |
236 | rx_queue->queue, rc); | |
237 | return rc; | |
238 | } | |
239 | ||
4d566063 BH |
240 | static void efx_unmap_rx_buffer(struct efx_nic *efx, |
241 | struct efx_rx_buffer *rx_buf) | |
8ceee660 BH |
242 | { |
243 | if (rx_buf->page) { | |
244 | EFX_BUG_ON_PARANOID(rx_buf->skb); | |
245 | if (rx_buf->unmap_addr) { | |
246 | pci_unmap_page(efx->pci_dev, rx_buf->unmap_addr, | |
55668611 BH |
247 | efx_rx_buf_size(efx), |
248 | PCI_DMA_FROMDEVICE); | |
8ceee660 BH |
249 | rx_buf->unmap_addr = 0; |
250 | } | |
251 | } else if (likely(rx_buf->skb)) { | |
252 | pci_unmap_single(efx->pci_dev, rx_buf->dma_addr, | |
253 | rx_buf->len, PCI_DMA_FROMDEVICE); | |
254 | } | |
255 | } | |
256 | ||
4d566063 BH |
257 | static void efx_free_rx_buffer(struct efx_nic *efx, |
258 | struct efx_rx_buffer *rx_buf) | |
8ceee660 BH |
259 | { |
260 | if (rx_buf->page) { | |
261 | __free_pages(rx_buf->page, efx->rx_buffer_order); | |
262 | rx_buf->page = NULL; | |
263 | } else if (likely(rx_buf->skb)) { | |
264 | dev_kfree_skb_any(rx_buf->skb); | |
265 | rx_buf->skb = NULL; | |
266 | } | |
267 | } | |
268 | ||
4d566063 BH |
269 | static void efx_fini_rx_buffer(struct efx_rx_queue *rx_queue, |
270 | struct efx_rx_buffer *rx_buf) | |
8ceee660 BH |
271 | { |
272 | efx_unmap_rx_buffer(rx_queue->efx, rx_buf); | |
273 | efx_free_rx_buffer(rx_queue->efx, rx_buf); | |
274 | } | |
275 | ||
276 | /** | |
277 | * efx_fast_push_rx_descriptors - push new RX descriptors quickly | |
278 | * @rx_queue: RX descriptor queue | |
279 | * @retry: Recheck the fill level | |
280 | * This will aim to fill the RX descriptor queue up to | |
281 | * @rx_queue->@fast_fill_limit. If there is insufficient atomic | |
282 | * memory to do so, the caller should retry. | |
283 | */ | |
284 | static int __efx_fast_push_rx_descriptors(struct efx_rx_queue *rx_queue, | |
285 | int retry) | |
286 | { | |
287 | struct efx_rx_buffer *rx_buf; | |
288 | unsigned fill_level, index; | |
289 | int i, space, rc = 0; | |
290 | ||
291 | /* Calculate current fill level. Do this outside the lock, | |
292 | * because most of the time we'll end up not wanting to do the | |
293 | * fill anyway. | |
294 | */ | |
295 | fill_level = (rx_queue->added_count - rx_queue->removed_count); | |
296 | EFX_BUG_ON_PARANOID(fill_level > | |
297 | rx_queue->efx->type->rxd_ring_mask + 1); | |
298 | ||
299 | /* Don't fill if we don't need to */ | |
300 | if (fill_level >= rx_queue->fast_fill_trigger) | |
301 | return 0; | |
302 | ||
303 | /* Record minimum fill level */ | |
b3475645 | 304 | if (unlikely(fill_level < rx_queue->min_fill)) { |
8ceee660 BH |
305 | if (fill_level) |
306 | rx_queue->min_fill = fill_level; | |
b3475645 | 307 | } |
8ceee660 BH |
308 | |
309 | /* Acquire RX add lock. If this lock is contended, then a fast | |
310 | * fill must already be in progress (e.g. in the refill | |
311 | * tasklet), so we don't need to do anything | |
312 | */ | |
313 | if (!spin_trylock_bh(&rx_queue->add_lock)) | |
314 | return -1; | |
315 | ||
316 | retry: | |
317 | /* Recalculate current fill level now that we have the lock */ | |
318 | fill_level = (rx_queue->added_count - rx_queue->removed_count); | |
319 | EFX_BUG_ON_PARANOID(fill_level > | |
320 | rx_queue->efx->type->rxd_ring_mask + 1); | |
321 | space = rx_queue->fast_fill_limit - fill_level; | |
322 | if (space < EFX_RX_BATCH) | |
323 | goto out_unlock; | |
324 | ||
325 | EFX_TRACE(rx_queue->efx, "RX queue %d fast-filling descriptor ring from" | |
326 | " level %d to level %d using %s allocation\n", | |
327 | rx_queue->queue, fill_level, rx_queue->fast_fill_limit, | |
328 | rx_queue->channel->rx_alloc_push_pages ? "page" : "skb"); | |
329 | ||
330 | do { | |
331 | for (i = 0; i < EFX_RX_BATCH; ++i) { | |
332 | index = (rx_queue->added_count & | |
333 | rx_queue->efx->type->rxd_ring_mask); | |
334 | rx_buf = efx_rx_buffer(rx_queue, index); | |
335 | rc = efx_init_rx_buffer(rx_queue, rx_buf); | |
336 | if (unlikely(rc)) | |
337 | goto out; | |
338 | ++rx_queue->added_count; | |
339 | } | |
340 | } while ((space -= EFX_RX_BATCH) >= EFX_RX_BATCH); | |
341 | ||
342 | EFX_TRACE(rx_queue->efx, "RX queue %d fast-filled descriptor ring " | |
343 | "to level %d\n", rx_queue->queue, | |
344 | rx_queue->added_count - rx_queue->removed_count); | |
345 | ||
346 | out: | |
347 | /* Send write pointer to card. */ | |
348 | falcon_notify_rx_desc(rx_queue); | |
349 | ||
350 | /* If the fast fill is running inside from the refill tasklet, then | |
351 | * for SMP systems it may be running on a different CPU to | |
352 | * RX event processing, which means that the fill level may now be | |
353 | * out of date. */ | |
354 | if (unlikely(retry && (rc == 0))) | |
355 | goto retry; | |
356 | ||
357 | out_unlock: | |
358 | spin_unlock_bh(&rx_queue->add_lock); | |
359 | ||
360 | return rc; | |
361 | } | |
362 | ||
363 | /** | |
364 | * efx_fast_push_rx_descriptors - push new RX descriptors quickly | |
365 | * @rx_queue: RX descriptor queue | |
366 | * | |
367 | * This will aim to fill the RX descriptor queue up to | |
368 | * @rx_queue->@fast_fill_limit. If there is insufficient memory to do so, | |
369 | * it will schedule a work item to immediately continue the fast fill | |
370 | */ | |
371 | void efx_fast_push_rx_descriptors(struct efx_rx_queue *rx_queue) | |
372 | { | |
373 | int rc; | |
374 | ||
375 | rc = __efx_fast_push_rx_descriptors(rx_queue, 0); | |
376 | if (unlikely(rc)) { | |
377 | /* Schedule the work item to run immediately. The hope is | |
378 | * that work is immediately pending to free some memory | |
379 | * (e.g. an RX event or TX completion) | |
380 | */ | |
381 | efx_schedule_slow_fill(rx_queue, 0); | |
382 | } | |
383 | } | |
384 | ||
385 | void efx_rx_work(struct work_struct *data) | |
386 | { | |
387 | struct efx_rx_queue *rx_queue; | |
388 | int rc; | |
389 | ||
390 | rx_queue = container_of(data, struct efx_rx_queue, work.work); | |
391 | ||
392 | if (unlikely(!rx_queue->channel->enabled)) | |
393 | return; | |
394 | ||
395 | EFX_TRACE(rx_queue->efx, "RX queue %d worker thread executing on CPU " | |
396 | "%d\n", rx_queue->queue, raw_smp_processor_id()); | |
397 | ||
398 | ++rx_queue->slow_fill_count; | |
399 | /* Push new RX descriptors, allowing at least 1 jiffy for | |
400 | * the kernel to free some more memory. */ | |
401 | rc = __efx_fast_push_rx_descriptors(rx_queue, 1); | |
402 | if (rc) | |
403 | efx_schedule_slow_fill(rx_queue, 1); | |
404 | } | |
405 | ||
4d566063 BH |
406 | static void efx_rx_packet__check_len(struct efx_rx_queue *rx_queue, |
407 | struct efx_rx_buffer *rx_buf, | |
408 | int len, bool *discard, | |
409 | bool *leak_packet) | |
8ceee660 BH |
410 | { |
411 | struct efx_nic *efx = rx_queue->efx; | |
412 | unsigned max_len = rx_buf->len - efx->type->rx_buffer_padding; | |
413 | ||
414 | if (likely(len <= max_len)) | |
415 | return; | |
416 | ||
417 | /* The packet must be discarded, but this is only a fatal error | |
418 | * if the caller indicated it was | |
419 | */ | |
dc8cfa55 | 420 | *discard = true; |
8ceee660 BH |
421 | |
422 | if ((len > rx_buf->len) && EFX_WORKAROUND_8071(efx)) { | |
423 | EFX_ERR_RL(efx, " RX queue %d seriously overlength " | |
424 | "RX event (0x%x > 0x%x+0x%x). Leaking\n", | |
425 | rx_queue->queue, len, max_len, | |
426 | efx->type->rx_buffer_padding); | |
427 | /* If this buffer was skb-allocated, then the meta | |
428 | * data at the end of the skb will be trashed. So | |
429 | * we have no choice but to leak the fragment. | |
430 | */ | |
431 | *leak_packet = (rx_buf->skb != NULL); | |
432 | efx_schedule_reset(efx, RESET_TYPE_RX_RECOVERY); | |
433 | } else { | |
434 | EFX_ERR_RL(efx, " RX queue %d overlength RX event " | |
435 | "(0x%x > 0x%x)\n", rx_queue->queue, len, max_len); | |
436 | } | |
437 | ||
438 | rx_queue->channel->n_rx_overlength++; | |
439 | } | |
440 | ||
441 | /* Pass a received packet up through the generic LRO stack | |
442 | * | |
443 | * Handles driverlink veto, and passes the fragment up via | |
444 | * the appropriate LRO method | |
445 | */ | |
4d566063 BH |
446 | static void efx_rx_packet_lro(struct efx_channel *channel, |
447 | struct efx_rx_buffer *rx_buf) | |
8ceee660 | 448 | { |
da3bc071 | 449 | struct napi_struct *napi = &channel->napi_str; |
8ceee660 BH |
450 | |
451 | /* Pass the skb/page into the LRO engine */ | |
452 | if (rx_buf->page) { | |
76620aaf | 453 | struct sk_buff *skb = napi_get_frags(napi); |
8ceee660 | 454 | |
76620aaf HX |
455 | if (!skb) { |
456 | put_page(rx_buf->page); | |
457 | goto out; | |
458 | } | |
459 | ||
460 | skb_shinfo(skb)->frags[0].page = rx_buf->page; | |
461 | skb_shinfo(skb)->frags[0].page_offset = | |
462 | efx_rx_buf_offset(rx_buf); | |
463 | skb_shinfo(skb)->frags[0].size = rx_buf->len; | |
464 | skb_shinfo(skb)->nr_frags = 1; | |
465 | ||
466 | skb->len = rx_buf->len; | |
467 | skb->data_len = rx_buf->len; | |
468 | skb->truesize += rx_buf->len; | |
469 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
8ceee660 | 470 | |
76620aaf | 471 | napi_gro_frags(napi); |
8ceee660 | 472 | |
76620aaf | 473 | out: |
8ceee660 BH |
474 | EFX_BUG_ON_PARANOID(rx_buf->skb); |
475 | rx_buf->page = NULL; | |
476 | } else { | |
477 | EFX_BUG_ON_PARANOID(!rx_buf->skb); | |
478 | ||
da3bc071 | 479 | napi_gro_receive(napi, rx_buf->skb); |
8ceee660 BH |
480 | rx_buf->skb = NULL; |
481 | } | |
482 | } | |
483 | ||
8ceee660 | 484 | void efx_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index, |
dc8cfa55 | 485 | unsigned int len, bool checksummed, bool discard) |
8ceee660 BH |
486 | { |
487 | struct efx_nic *efx = rx_queue->efx; | |
488 | struct efx_rx_buffer *rx_buf; | |
dc8cfa55 | 489 | bool leak_packet = false; |
8ceee660 BH |
490 | |
491 | rx_buf = efx_rx_buffer(rx_queue, index); | |
492 | EFX_BUG_ON_PARANOID(!rx_buf->data); | |
493 | EFX_BUG_ON_PARANOID(rx_buf->skb && rx_buf->page); | |
494 | EFX_BUG_ON_PARANOID(!(rx_buf->skb || rx_buf->page)); | |
495 | ||
496 | /* This allows the refill path to post another buffer. | |
497 | * EFX_RXD_HEAD_ROOM ensures that the slot we are using | |
498 | * isn't overwritten yet. | |
499 | */ | |
500 | rx_queue->removed_count++; | |
501 | ||
502 | /* Validate the length encoded in the event vs the descriptor pushed */ | |
503 | efx_rx_packet__check_len(rx_queue, rx_buf, len, | |
504 | &discard, &leak_packet); | |
505 | ||
506 | EFX_TRACE(efx, "RX queue %d received id %x at %llx+%x %s%s\n", | |
507 | rx_queue->queue, index, | |
508 | (unsigned long long)rx_buf->dma_addr, len, | |
509 | (checksummed ? " [SUMMED]" : ""), | |
510 | (discard ? " [DISCARD]" : "")); | |
511 | ||
512 | /* Discard packet, if instructed to do so */ | |
513 | if (unlikely(discard)) { | |
514 | if (unlikely(leak_packet)) | |
515 | rx_queue->channel->n_skbuff_leaks++; | |
516 | else | |
517 | /* We haven't called efx_unmap_rx_buffer yet, | |
518 | * so fini the entire rx_buffer here */ | |
519 | efx_fini_rx_buffer(rx_queue, rx_buf); | |
520 | return; | |
521 | } | |
522 | ||
523 | /* Release card resources - assumes all RX buffers consumed in-order | |
524 | * per RX queue | |
525 | */ | |
526 | efx_unmap_rx_buffer(efx, rx_buf); | |
527 | ||
528 | /* Prefetch nice and early so data will (hopefully) be in cache by | |
529 | * the time we look at it. | |
530 | */ | |
531 | prefetch(rx_buf->data); | |
532 | ||
533 | /* Pipeline receives so that we give time for packet headers to be | |
534 | * prefetched into cache. | |
535 | */ | |
536 | rx_buf->len = len; | |
537 | if (rx_queue->channel->rx_pkt) | |
538 | __efx_rx_packet(rx_queue->channel, | |
539 | rx_queue->channel->rx_pkt, | |
540 | rx_queue->channel->rx_pkt_csummed); | |
541 | rx_queue->channel->rx_pkt = rx_buf; | |
542 | rx_queue->channel->rx_pkt_csummed = checksummed; | |
543 | } | |
544 | ||
545 | /* Handle a received packet. Second half: Touches packet payload. */ | |
546 | void __efx_rx_packet(struct efx_channel *channel, | |
dc8cfa55 | 547 | struct efx_rx_buffer *rx_buf, bool checksummed) |
8ceee660 BH |
548 | { |
549 | struct efx_nic *efx = channel->efx; | |
550 | struct sk_buff *skb; | |
8ceee660 | 551 | |
3273c2e8 BH |
552 | /* If we're in loopback test, then pass the packet directly to the |
553 | * loopback layer, and free the rx_buf here | |
554 | */ | |
555 | if (unlikely(efx->loopback_selftest)) { | |
556 | efx_loopback_rx_packet(efx, rx_buf->data, rx_buf->len); | |
557 | efx_free_rx_buffer(efx, rx_buf); | |
558 | goto done; | |
559 | } | |
560 | ||
8ceee660 BH |
561 | if (rx_buf->skb) { |
562 | prefetch(skb_shinfo(rx_buf->skb)); | |
563 | ||
564 | skb_put(rx_buf->skb, rx_buf->len); | |
565 | ||
566 | /* Move past the ethernet header. rx_buf->data still points | |
567 | * at the ethernet header */ | |
568 | rx_buf->skb->protocol = eth_type_trans(rx_buf->skb, | |
569 | efx->net_dev); | |
570 | } | |
571 | ||
da3bc071 | 572 | if (likely(checksummed || rx_buf->page)) { |
8ceee660 BH |
573 | efx_rx_packet_lro(channel, rx_buf); |
574 | goto done; | |
575 | } | |
576 | ||
da3bc071 HX |
577 | /* We now own the SKB */ |
578 | skb = rx_buf->skb; | |
579 | rx_buf->skb = NULL; | |
8ceee660 BH |
580 | |
581 | EFX_BUG_ON_PARANOID(rx_buf->page); | |
582 | EFX_BUG_ON_PARANOID(rx_buf->skb); | |
583 | EFX_BUG_ON_PARANOID(!skb); | |
584 | ||
585 | /* Set the SKB flags */ | |
da3bc071 | 586 | skb->ip_summed = CHECKSUM_NONE; |
8ceee660 | 587 | |
0c8dfc83 DM |
588 | skb_record_rx_queue(skb, channel->channel); |
589 | ||
8ceee660 BH |
590 | /* Pass the packet up */ |
591 | netif_receive_skb(skb); | |
592 | ||
593 | /* Update allocation strategy method */ | |
594 | channel->rx_alloc_level += RX_ALLOC_FACTOR_SKB; | |
595 | ||
8ceee660 | 596 | done: |
babcda74 | 597 | ; |
8ceee660 BH |
598 | } |
599 | ||
600 | void efx_rx_strategy(struct efx_channel *channel) | |
601 | { | |
602 | enum efx_rx_alloc_method method = rx_alloc_method; | |
603 | ||
604 | /* Only makes sense to use page based allocation if LRO is enabled */ | |
da3bc071 | 605 | if (!(channel->efx->net_dev->features & NETIF_F_GRO)) { |
8ceee660 BH |
606 | method = RX_ALLOC_METHOD_SKB; |
607 | } else if (method == RX_ALLOC_METHOD_AUTO) { | |
608 | /* Constrain the rx_alloc_level */ | |
609 | if (channel->rx_alloc_level < 0) | |
610 | channel->rx_alloc_level = 0; | |
611 | else if (channel->rx_alloc_level > RX_ALLOC_LEVEL_MAX) | |
612 | channel->rx_alloc_level = RX_ALLOC_LEVEL_MAX; | |
613 | ||
614 | /* Decide on the allocation method */ | |
615 | method = ((channel->rx_alloc_level > RX_ALLOC_LEVEL_LRO) ? | |
616 | RX_ALLOC_METHOD_PAGE : RX_ALLOC_METHOD_SKB); | |
617 | } | |
618 | ||
619 | /* Push the option */ | |
620 | channel->rx_alloc_push_pages = (method == RX_ALLOC_METHOD_PAGE); | |
621 | } | |
622 | ||
623 | int efx_probe_rx_queue(struct efx_rx_queue *rx_queue) | |
624 | { | |
625 | struct efx_nic *efx = rx_queue->efx; | |
626 | unsigned int rxq_size; | |
627 | int rc; | |
628 | ||
629 | EFX_LOG(efx, "creating RX queue %d\n", rx_queue->queue); | |
630 | ||
631 | /* Allocate RX buffers */ | |
632 | rxq_size = (efx->type->rxd_ring_mask + 1) * sizeof(*rx_queue->buffer); | |
633 | rx_queue->buffer = kzalloc(rxq_size, GFP_KERNEL); | |
8831da7b BH |
634 | if (!rx_queue->buffer) |
635 | return -ENOMEM; | |
8ceee660 BH |
636 | |
637 | rc = falcon_probe_rx(rx_queue); | |
8831da7b BH |
638 | if (rc) { |
639 | kfree(rx_queue->buffer); | |
640 | rx_queue->buffer = NULL; | |
641 | } | |
8ceee660 BH |
642 | return rc; |
643 | } | |
644 | ||
bc3c90a2 | 645 | void efx_init_rx_queue(struct efx_rx_queue *rx_queue) |
8ceee660 BH |
646 | { |
647 | struct efx_nic *efx = rx_queue->efx; | |
648 | unsigned int max_fill, trigger, limit; | |
649 | ||
650 | EFX_LOG(rx_queue->efx, "initialising RX queue %d\n", rx_queue->queue); | |
651 | ||
652 | /* Initialise ptr fields */ | |
653 | rx_queue->added_count = 0; | |
654 | rx_queue->notified_count = 0; | |
655 | rx_queue->removed_count = 0; | |
656 | rx_queue->min_fill = -1U; | |
657 | rx_queue->min_overfill = -1U; | |
658 | ||
659 | /* Initialise limit fields */ | |
660 | max_fill = efx->type->rxd_ring_mask + 1 - EFX_RXD_HEAD_ROOM; | |
661 | trigger = max_fill * min(rx_refill_threshold, 100U) / 100U; | |
662 | limit = max_fill * min(rx_refill_limit, 100U) / 100U; | |
663 | ||
664 | rx_queue->max_fill = max_fill; | |
665 | rx_queue->fast_fill_trigger = trigger; | |
666 | rx_queue->fast_fill_limit = limit; | |
667 | ||
668 | /* Set up RX descriptor ring */ | |
bc3c90a2 | 669 | falcon_init_rx(rx_queue); |
8ceee660 BH |
670 | } |
671 | ||
672 | void efx_fini_rx_queue(struct efx_rx_queue *rx_queue) | |
673 | { | |
674 | int i; | |
675 | struct efx_rx_buffer *rx_buf; | |
676 | ||
677 | EFX_LOG(rx_queue->efx, "shutting down RX queue %d\n", rx_queue->queue); | |
678 | ||
679 | falcon_fini_rx(rx_queue); | |
680 | ||
681 | /* Release RX buffers NB start at index 0 not current HW ptr */ | |
682 | if (rx_queue->buffer) { | |
683 | for (i = 0; i <= rx_queue->efx->type->rxd_ring_mask; i++) { | |
684 | rx_buf = efx_rx_buffer(rx_queue, i); | |
685 | efx_fini_rx_buffer(rx_queue, rx_buf); | |
686 | } | |
687 | } | |
688 | ||
689 | /* For a page that is part-way through splitting into RX buffers */ | |
690 | if (rx_queue->buf_page != NULL) { | |
691 | pci_unmap_page(rx_queue->efx->pci_dev, rx_queue->buf_dma_addr, | |
55668611 BH |
692 | efx_rx_buf_size(rx_queue->efx), |
693 | PCI_DMA_FROMDEVICE); | |
8ceee660 BH |
694 | __free_pages(rx_queue->buf_page, |
695 | rx_queue->efx->rx_buffer_order); | |
696 | rx_queue->buf_page = NULL; | |
697 | } | |
698 | } | |
699 | ||
700 | void efx_remove_rx_queue(struct efx_rx_queue *rx_queue) | |
701 | { | |
702 | EFX_LOG(rx_queue->efx, "destroying RX queue %d\n", rx_queue->queue); | |
703 | ||
704 | falcon_remove_rx(rx_queue); | |
705 | ||
706 | kfree(rx_queue->buffer); | |
707 | rx_queue->buffer = NULL; | |
8ceee660 BH |
708 | } |
709 | ||
8ceee660 BH |
710 | |
711 | module_param(rx_alloc_method, int, 0644); | |
712 | MODULE_PARM_DESC(rx_alloc_method, "Allocation method used for RX buffers"); | |
713 | ||
714 | module_param(rx_refill_threshold, uint, 0444); | |
715 | MODULE_PARM_DESC(rx_refill_threshold, | |
716 | "RX descriptor ring fast/slow fill threshold (%)"); | |
717 |