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7f12ad74 GR |
1 | /******************************************************************************* |
2 | * | |
3 | * Intel Ethernet Controller XL710 Family Linux Virtual Function Driver | |
af1a2a9c | 4 | * Copyright(c) 2013 - 2014 Intel Corporation. |
7f12ad74 GR |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms and conditions of the GNU General Public License, | |
8 | * version 2, as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope it will be useful, but WITHOUT | |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
14 | * | |
b831607d JB |
15 | * You should have received a copy of the GNU General Public License along |
16 | * with this program. If not, see <http://www.gnu.org/licenses/>. | |
17 | * | |
7f12ad74 GR |
18 | * The full GNU General Public License is included in this distribution in |
19 | * the file called "COPYING". | |
20 | * | |
21 | * Contact Information: | |
22 | * e1000-devel Mailing List <e1000-devel@lists.sourceforge.net> | |
23 | * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 | |
24 | * | |
25 | ******************************************************************************/ | |
26 | ||
7ed3f5f0 PG |
27 | #include <linux/prefetch.h> |
28 | ||
7f12ad74 | 29 | #include "i40evf.h" |
206812b5 | 30 | #include "i40e_prototype.h" |
7f12ad74 GR |
31 | |
32 | static inline __le64 build_ctob(u32 td_cmd, u32 td_offset, unsigned int size, | |
33 | u32 td_tag) | |
34 | { | |
35 | return cpu_to_le64(I40E_TX_DESC_DTYPE_DATA | | |
36 | ((u64)td_cmd << I40E_TXD_QW1_CMD_SHIFT) | | |
37 | ((u64)td_offset << I40E_TXD_QW1_OFFSET_SHIFT) | | |
38 | ((u64)size << I40E_TXD_QW1_TX_BUF_SZ_SHIFT) | | |
39 | ((u64)td_tag << I40E_TXD_QW1_L2TAG1_SHIFT)); | |
40 | } | |
41 | ||
42 | #define I40E_TXD_CMD (I40E_TX_DESC_CMD_EOP | I40E_TX_DESC_CMD_RS) | |
43 | ||
44 | /** | |
45 | * i40e_unmap_and_free_tx_resource - Release a Tx buffer | |
46 | * @ring: the ring that owns the buffer | |
47 | * @tx_buffer: the buffer to free | |
48 | **/ | |
49 | static void i40e_unmap_and_free_tx_resource(struct i40e_ring *ring, | |
50 | struct i40e_tx_buffer *tx_buffer) | |
51 | { | |
52 | if (tx_buffer->skb) { | |
53 | dev_kfree_skb_any(tx_buffer->skb); | |
54 | if (dma_unmap_len(tx_buffer, len)) | |
55 | dma_unmap_single(ring->dev, | |
56 | dma_unmap_addr(tx_buffer, dma), | |
57 | dma_unmap_len(tx_buffer, len), | |
58 | DMA_TO_DEVICE); | |
59 | } else if (dma_unmap_len(tx_buffer, len)) { | |
60 | dma_unmap_page(ring->dev, | |
61 | dma_unmap_addr(tx_buffer, dma), | |
62 | dma_unmap_len(tx_buffer, len), | |
63 | DMA_TO_DEVICE); | |
64 | } | |
65 | tx_buffer->next_to_watch = NULL; | |
66 | tx_buffer->skb = NULL; | |
67 | dma_unmap_len_set(tx_buffer, len, 0); | |
68 | /* tx_buffer must be completely set up in the transmit path */ | |
69 | } | |
70 | ||
71 | /** | |
72 | * i40evf_clean_tx_ring - Free any empty Tx buffers | |
73 | * @tx_ring: ring to be cleaned | |
74 | **/ | |
75 | void i40evf_clean_tx_ring(struct i40e_ring *tx_ring) | |
76 | { | |
77 | unsigned long bi_size; | |
78 | u16 i; | |
79 | ||
80 | /* ring already cleared, nothing to do */ | |
81 | if (!tx_ring->tx_bi) | |
82 | return; | |
83 | ||
84 | /* Free all the Tx ring sk_buffs */ | |
85 | for (i = 0; i < tx_ring->count; i++) | |
86 | i40e_unmap_and_free_tx_resource(tx_ring, &tx_ring->tx_bi[i]); | |
87 | ||
88 | bi_size = sizeof(struct i40e_tx_buffer) * tx_ring->count; | |
89 | memset(tx_ring->tx_bi, 0, bi_size); | |
90 | ||
91 | /* Zero out the descriptor ring */ | |
92 | memset(tx_ring->desc, 0, tx_ring->size); | |
93 | ||
94 | tx_ring->next_to_use = 0; | |
95 | tx_ring->next_to_clean = 0; | |
96 | ||
97 | if (!tx_ring->netdev) | |
98 | return; | |
99 | ||
100 | /* cleanup Tx queue statistics */ | |
101 | netdev_tx_reset_queue(netdev_get_tx_queue(tx_ring->netdev, | |
102 | tx_ring->queue_index)); | |
103 | } | |
104 | ||
105 | /** | |
106 | * i40evf_free_tx_resources - Free Tx resources per queue | |
107 | * @tx_ring: Tx descriptor ring for a specific queue | |
108 | * | |
109 | * Free all transmit software resources | |
110 | **/ | |
111 | void i40evf_free_tx_resources(struct i40e_ring *tx_ring) | |
112 | { | |
113 | i40evf_clean_tx_ring(tx_ring); | |
114 | kfree(tx_ring->tx_bi); | |
115 | tx_ring->tx_bi = NULL; | |
116 | ||
117 | if (tx_ring->desc) { | |
118 | dma_free_coherent(tx_ring->dev, tx_ring->size, | |
119 | tx_ring->desc, tx_ring->dma); | |
120 | tx_ring->desc = NULL; | |
121 | } | |
122 | } | |
123 | ||
124 | /** | |
125 | * i40e_get_tx_pending - how many tx descriptors not processed | |
126 | * @tx_ring: the ring of descriptors | |
127 | * | |
128 | * Since there is no access to the ring head register | |
129 | * in XL710, we need to use our local copies | |
130 | **/ | |
131 | static u32 i40e_get_tx_pending(struct i40e_ring *ring) | |
132 | { | |
133 | u32 ntu = ((ring->next_to_clean <= ring->next_to_use) | |
134 | ? ring->next_to_use | |
135 | : ring->next_to_use + ring->count); | |
136 | return ntu - ring->next_to_clean; | |
137 | } | |
138 | ||
139 | /** | |
140 | * i40e_check_tx_hang - Is there a hang in the Tx queue | |
141 | * @tx_ring: the ring of descriptors | |
142 | **/ | |
143 | static bool i40e_check_tx_hang(struct i40e_ring *tx_ring) | |
144 | { | |
145 | u32 tx_pending = i40e_get_tx_pending(tx_ring); | |
146 | bool ret = false; | |
147 | ||
148 | clear_check_for_tx_hang(tx_ring); | |
149 | ||
150 | /* Check for a hung queue, but be thorough. This verifies | |
151 | * that a transmit has been completed since the previous | |
152 | * check AND there is at least one packet pending. The | |
153 | * ARMED bit is set to indicate a potential hang. The | |
154 | * bit is cleared if a pause frame is received to remove | |
155 | * false hang detection due to PFC or 802.3x frames. By | |
156 | * requiring this to fail twice we avoid races with | |
157 | * PFC clearing the ARMED bit and conditions where we | |
158 | * run the check_tx_hang logic with a transmit completion | |
159 | * pending but without time to complete it yet. | |
160 | */ | |
161 | if ((tx_ring->tx_stats.tx_done_old == tx_ring->stats.packets) && | |
162 | tx_pending) { | |
163 | /* make sure it is true for two checks in a row */ | |
164 | ret = test_and_set_bit(__I40E_HANG_CHECK_ARMED, | |
165 | &tx_ring->state); | |
166 | } else { | |
167 | /* update completed stats and disarm the hang check */ | |
168 | tx_ring->tx_stats.tx_done_old = tx_ring->stats.packets; | |
169 | clear_bit(__I40E_HANG_CHECK_ARMED, &tx_ring->state); | |
170 | } | |
171 | ||
172 | return ret; | |
173 | } | |
174 | ||
1943d8ba JB |
175 | /** |
176 | * i40e_get_head - Retrieve head from head writeback | |
177 | * @tx_ring: tx ring to fetch head of | |
178 | * | |
179 | * Returns value of Tx ring head based on value stored | |
180 | * in head write-back location | |
181 | **/ | |
182 | static inline u32 i40e_get_head(struct i40e_ring *tx_ring) | |
183 | { | |
184 | void *head = (struct i40e_tx_desc *)tx_ring->desc + tx_ring->count; | |
185 | ||
186 | return le32_to_cpu(*(volatile __le32 *)head); | |
187 | } | |
188 | ||
7f12ad74 GR |
189 | /** |
190 | * i40e_clean_tx_irq - Reclaim resources after transmit completes | |
191 | * @tx_ring: tx ring to clean | |
192 | * @budget: how many cleans we're allowed | |
193 | * | |
194 | * Returns true if there's any budget left (e.g. the clean is finished) | |
195 | **/ | |
196 | static bool i40e_clean_tx_irq(struct i40e_ring *tx_ring, int budget) | |
197 | { | |
198 | u16 i = tx_ring->next_to_clean; | |
199 | struct i40e_tx_buffer *tx_buf; | |
1943d8ba | 200 | struct i40e_tx_desc *tx_head; |
7f12ad74 GR |
201 | struct i40e_tx_desc *tx_desc; |
202 | unsigned int total_packets = 0; | |
203 | unsigned int total_bytes = 0; | |
204 | ||
205 | tx_buf = &tx_ring->tx_bi[i]; | |
206 | tx_desc = I40E_TX_DESC(tx_ring, i); | |
207 | i -= tx_ring->count; | |
208 | ||
1943d8ba JB |
209 | tx_head = I40E_TX_DESC(tx_ring, i40e_get_head(tx_ring)); |
210 | ||
7f12ad74 GR |
211 | do { |
212 | struct i40e_tx_desc *eop_desc = tx_buf->next_to_watch; | |
213 | ||
214 | /* if next_to_watch is not set then there is no work pending */ | |
215 | if (!eop_desc) | |
216 | break; | |
217 | ||
218 | /* prevent any other reads prior to eop_desc */ | |
219 | read_barrier_depends(); | |
220 | ||
1943d8ba JB |
221 | /* we have caught up to head, no work left to do */ |
222 | if (tx_head == tx_desc) | |
7f12ad74 GR |
223 | break; |
224 | ||
225 | /* clear next_to_watch to prevent false hangs */ | |
226 | tx_buf->next_to_watch = NULL; | |
227 | ||
228 | /* update the statistics for this packet */ | |
229 | total_bytes += tx_buf->bytecount; | |
230 | total_packets += tx_buf->gso_segs; | |
231 | ||
232 | /* free the skb */ | |
233 | dev_kfree_skb_any(tx_buf->skb); | |
234 | ||
235 | /* unmap skb header data */ | |
236 | dma_unmap_single(tx_ring->dev, | |
237 | dma_unmap_addr(tx_buf, dma), | |
238 | dma_unmap_len(tx_buf, len), | |
239 | DMA_TO_DEVICE); | |
240 | ||
241 | /* clear tx_buffer data */ | |
242 | tx_buf->skb = NULL; | |
243 | dma_unmap_len_set(tx_buf, len, 0); | |
244 | ||
245 | /* unmap remaining buffers */ | |
246 | while (tx_desc != eop_desc) { | |
247 | ||
248 | tx_buf++; | |
249 | tx_desc++; | |
250 | i++; | |
251 | if (unlikely(!i)) { | |
252 | i -= tx_ring->count; | |
253 | tx_buf = tx_ring->tx_bi; | |
254 | tx_desc = I40E_TX_DESC(tx_ring, 0); | |
255 | } | |
256 | ||
257 | /* unmap any remaining paged data */ | |
258 | if (dma_unmap_len(tx_buf, len)) { | |
259 | dma_unmap_page(tx_ring->dev, | |
260 | dma_unmap_addr(tx_buf, dma), | |
261 | dma_unmap_len(tx_buf, len), | |
262 | DMA_TO_DEVICE); | |
263 | dma_unmap_len_set(tx_buf, len, 0); | |
264 | } | |
265 | } | |
266 | ||
267 | /* move us one more past the eop_desc for start of next pkt */ | |
268 | tx_buf++; | |
269 | tx_desc++; | |
270 | i++; | |
271 | if (unlikely(!i)) { | |
272 | i -= tx_ring->count; | |
273 | tx_buf = tx_ring->tx_bi; | |
274 | tx_desc = I40E_TX_DESC(tx_ring, 0); | |
275 | } | |
276 | ||
277 | /* update budget accounting */ | |
278 | budget--; | |
279 | } while (likely(budget)); | |
280 | ||
281 | i += tx_ring->count; | |
282 | tx_ring->next_to_clean = i; | |
283 | u64_stats_update_begin(&tx_ring->syncp); | |
284 | tx_ring->stats.bytes += total_bytes; | |
285 | tx_ring->stats.packets += total_packets; | |
286 | u64_stats_update_end(&tx_ring->syncp); | |
287 | tx_ring->q_vector->tx.total_bytes += total_bytes; | |
288 | tx_ring->q_vector->tx.total_packets += total_packets; | |
289 | ||
290 | if (check_for_tx_hang(tx_ring) && i40e_check_tx_hang(tx_ring)) { | |
291 | /* schedule immediate reset if we believe we hung */ | |
292 | dev_info(tx_ring->dev, "Detected Tx Unit Hang\n" | |
293 | " VSI <%d>\n" | |
294 | " Tx Queue <%d>\n" | |
295 | " next_to_use <%x>\n" | |
296 | " next_to_clean <%x>\n", | |
297 | tx_ring->vsi->seid, | |
298 | tx_ring->queue_index, | |
299 | tx_ring->next_to_use, i); | |
300 | dev_info(tx_ring->dev, "tx_bi[next_to_clean]\n" | |
301 | " time_stamp <%lx>\n" | |
302 | " jiffies <%lx>\n", | |
303 | tx_ring->tx_bi[i].time_stamp, jiffies); | |
304 | ||
305 | netif_stop_subqueue(tx_ring->netdev, tx_ring->queue_index); | |
306 | ||
307 | dev_info(tx_ring->dev, | |
308 | "tx hang detected on queue %d, resetting adapter\n", | |
309 | tx_ring->queue_index); | |
310 | ||
311 | tx_ring->netdev->netdev_ops->ndo_tx_timeout(tx_ring->netdev); | |
312 | ||
313 | /* the adapter is about to reset, no point in enabling stuff */ | |
314 | return true; | |
315 | } | |
316 | ||
317 | netdev_tx_completed_queue(netdev_get_tx_queue(tx_ring->netdev, | |
318 | tx_ring->queue_index), | |
319 | total_packets, total_bytes); | |
320 | ||
321 | #define TX_WAKE_THRESHOLD (DESC_NEEDED * 2) | |
322 | if (unlikely(total_packets && netif_carrier_ok(tx_ring->netdev) && | |
323 | (I40E_DESC_UNUSED(tx_ring) >= TX_WAKE_THRESHOLD))) { | |
324 | /* Make sure that anybody stopping the queue after this | |
325 | * sees the new next_to_clean. | |
326 | */ | |
327 | smp_mb(); | |
328 | if (__netif_subqueue_stopped(tx_ring->netdev, | |
329 | tx_ring->queue_index) && | |
330 | !test_bit(__I40E_DOWN, &tx_ring->vsi->state)) { | |
331 | netif_wake_subqueue(tx_ring->netdev, | |
332 | tx_ring->queue_index); | |
333 | ++tx_ring->tx_stats.restart_queue; | |
334 | } | |
335 | } | |
336 | ||
337 | return budget > 0; | |
338 | } | |
339 | ||
340 | /** | |
341 | * i40e_set_new_dynamic_itr - Find new ITR level | |
342 | * @rc: structure containing ring performance data | |
343 | * | |
344 | * Stores a new ITR value based on packets and byte counts during | |
345 | * the last interrupt. The advantage of per interrupt computation | |
346 | * is faster updates and more accurate ITR for the current traffic | |
347 | * pattern. Constants in this function were computed based on | |
348 | * theoretical maximum wire speed and thresholds were set based on | |
349 | * testing data as well as attempting to minimize response time | |
350 | * while increasing bulk throughput. | |
351 | **/ | |
352 | static void i40e_set_new_dynamic_itr(struct i40e_ring_container *rc) | |
353 | { | |
354 | enum i40e_latency_range new_latency_range = rc->latency_range; | |
355 | u32 new_itr = rc->itr; | |
356 | int bytes_per_int; | |
357 | ||
358 | if (rc->total_packets == 0 || !rc->itr) | |
359 | return; | |
360 | ||
361 | /* simple throttlerate management | |
362 | * 0-10MB/s lowest (100000 ints/s) | |
363 | * 10-20MB/s low (20000 ints/s) | |
364 | * 20-1249MB/s bulk (8000 ints/s) | |
365 | */ | |
366 | bytes_per_int = rc->total_bytes / rc->itr; | |
367 | switch (rc->itr) { | |
368 | case I40E_LOWEST_LATENCY: | |
369 | if (bytes_per_int > 10) | |
370 | new_latency_range = I40E_LOW_LATENCY; | |
371 | break; | |
372 | case I40E_LOW_LATENCY: | |
373 | if (bytes_per_int > 20) | |
374 | new_latency_range = I40E_BULK_LATENCY; | |
375 | else if (bytes_per_int <= 10) | |
376 | new_latency_range = I40E_LOWEST_LATENCY; | |
377 | break; | |
378 | case I40E_BULK_LATENCY: | |
379 | if (bytes_per_int <= 20) | |
380 | rc->latency_range = I40E_LOW_LATENCY; | |
381 | break; | |
382 | } | |
383 | ||
384 | switch (new_latency_range) { | |
385 | case I40E_LOWEST_LATENCY: | |
386 | new_itr = I40E_ITR_100K; | |
387 | break; | |
388 | case I40E_LOW_LATENCY: | |
389 | new_itr = I40E_ITR_20K; | |
390 | break; | |
391 | case I40E_BULK_LATENCY: | |
392 | new_itr = I40E_ITR_8K; | |
393 | break; | |
394 | default: | |
395 | break; | |
396 | } | |
397 | ||
398 | if (new_itr != rc->itr) { | |
399 | /* do an exponential smoothing */ | |
400 | new_itr = (10 * new_itr * rc->itr) / | |
401 | ((9 * new_itr) + rc->itr); | |
402 | rc->itr = new_itr & I40E_MAX_ITR; | |
403 | } | |
404 | ||
405 | rc->total_bytes = 0; | |
406 | rc->total_packets = 0; | |
407 | } | |
408 | ||
409 | /** | |
410 | * i40e_update_dynamic_itr - Adjust ITR based on bytes per int | |
411 | * @q_vector: the vector to adjust | |
412 | **/ | |
413 | static void i40e_update_dynamic_itr(struct i40e_q_vector *q_vector) | |
414 | { | |
415 | u16 vector = q_vector->vsi->base_vector + q_vector->v_idx; | |
416 | struct i40e_hw *hw = &q_vector->vsi->back->hw; | |
417 | u32 reg_addr; | |
418 | u16 old_itr; | |
419 | ||
420 | reg_addr = I40E_VFINT_ITRN1(I40E_RX_ITR, vector - 1); | |
421 | old_itr = q_vector->rx.itr; | |
422 | i40e_set_new_dynamic_itr(&q_vector->rx); | |
423 | if (old_itr != q_vector->rx.itr) | |
424 | wr32(hw, reg_addr, q_vector->rx.itr); | |
425 | ||
426 | reg_addr = I40E_VFINT_ITRN1(I40E_TX_ITR, vector - 1); | |
427 | old_itr = q_vector->tx.itr; | |
428 | i40e_set_new_dynamic_itr(&q_vector->tx); | |
429 | if (old_itr != q_vector->tx.itr) | |
430 | wr32(hw, reg_addr, q_vector->tx.itr); | |
431 | } | |
432 | ||
433 | /** | |
434 | * i40evf_setup_tx_descriptors - Allocate the Tx descriptors | |
435 | * @tx_ring: the tx ring to set up | |
436 | * | |
437 | * Return 0 on success, negative on error | |
438 | **/ | |
439 | int i40evf_setup_tx_descriptors(struct i40e_ring *tx_ring) | |
440 | { | |
441 | struct device *dev = tx_ring->dev; | |
442 | int bi_size; | |
443 | ||
444 | if (!dev) | |
445 | return -ENOMEM; | |
446 | ||
447 | bi_size = sizeof(struct i40e_tx_buffer) * tx_ring->count; | |
448 | tx_ring->tx_bi = kzalloc(bi_size, GFP_KERNEL); | |
449 | if (!tx_ring->tx_bi) | |
450 | goto err; | |
451 | ||
452 | /* round up to nearest 4K */ | |
453 | tx_ring->size = tx_ring->count * sizeof(struct i40e_tx_desc); | |
1943d8ba JB |
454 | /* add u32 for head writeback, align after this takes care of |
455 | * guaranteeing this is at least one cache line in size | |
456 | */ | |
457 | tx_ring->size += sizeof(u32); | |
7f12ad74 GR |
458 | tx_ring->size = ALIGN(tx_ring->size, 4096); |
459 | tx_ring->desc = dma_alloc_coherent(dev, tx_ring->size, | |
460 | &tx_ring->dma, GFP_KERNEL); | |
461 | if (!tx_ring->desc) { | |
462 | dev_info(dev, "Unable to allocate memory for the Tx descriptor ring, size=%d\n", | |
463 | tx_ring->size); | |
464 | goto err; | |
465 | } | |
466 | ||
467 | tx_ring->next_to_use = 0; | |
468 | tx_ring->next_to_clean = 0; | |
469 | return 0; | |
470 | ||
471 | err: | |
472 | kfree(tx_ring->tx_bi); | |
473 | tx_ring->tx_bi = NULL; | |
474 | return -ENOMEM; | |
475 | } | |
476 | ||
477 | /** | |
478 | * i40evf_clean_rx_ring - Free Rx buffers | |
479 | * @rx_ring: ring to be cleaned | |
480 | **/ | |
481 | void i40evf_clean_rx_ring(struct i40e_ring *rx_ring) | |
482 | { | |
483 | struct device *dev = rx_ring->dev; | |
484 | struct i40e_rx_buffer *rx_bi; | |
485 | unsigned long bi_size; | |
486 | u16 i; | |
487 | ||
488 | /* ring already cleared, nothing to do */ | |
489 | if (!rx_ring->rx_bi) | |
490 | return; | |
491 | ||
492 | /* Free all the Rx ring sk_buffs */ | |
493 | for (i = 0; i < rx_ring->count; i++) { | |
494 | rx_bi = &rx_ring->rx_bi[i]; | |
495 | if (rx_bi->dma) { | |
496 | dma_unmap_single(dev, | |
497 | rx_bi->dma, | |
498 | rx_ring->rx_buf_len, | |
499 | DMA_FROM_DEVICE); | |
500 | rx_bi->dma = 0; | |
501 | } | |
502 | if (rx_bi->skb) { | |
503 | dev_kfree_skb(rx_bi->skb); | |
504 | rx_bi->skb = NULL; | |
505 | } | |
506 | if (rx_bi->page) { | |
507 | if (rx_bi->page_dma) { | |
508 | dma_unmap_page(dev, | |
509 | rx_bi->page_dma, | |
510 | PAGE_SIZE / 2, | |
511 | DMA_FROM_DEVICE); | |
512 | rx_bi->page_dma = 0; | |
513 | } | |
514 | __free_page(rx_bi->page); | |
515 | rx_bi->page = NULL; | |
516 | rx_bi->page_offset = 0; | |
517 | } | |
518 | } | |
519 | ||
520 | bi_size = sizeof(struct i40e_rx_buffer) * rx_ring->count; | |
521 | memset(rx_ring->rx_bi, 0, bi_size); | |
522 | ||
523 | /* Zero out the descriptor ring */ | |
524 | memset(rx_ring->desc, 0, rx_ring->size); | |
525 | ||
526 | rx_ring->next_to_clean = 0; | |
527 | rx_ring->next_to_use = 0; | |
528 | } | |
529 | ||
530 | /** | |
531 | * i40evf_free_rx_resources - Free Rx resources | |
532 | * @rx_ring: ring to clean the resources from | |
533 | * | |
534 | * Free all receive software resources | |
535 | **/ | |
536 | void i40evf_free_rx_resources(struct i40e_ring *rx_ring) | |
537 | { | |
538 | i40evf_clean_rx_ring(rx_ring); | |
539 | kfree(rx_ring->rx_bi); | |
540 | rx_ring->rx_bi = NULL; | |
541 | ||
542 | if (rx_ring->desc) { | |
543 | dma_free_coherent(rx_ring->dev, rx_ring->size, | |
544 | rx_ring->desc, rx_ring->dma); | |
545 | rx_ring->desc = NULL; | |
546 | } | |
547 | } | |
548 | ||
549 | /** | |
550 | * i40evf_setup_rx_descriptors - Allocate Rx descriptors | |
551 | * @rx_ring: Rx descriptor ring (for a specific queue) to setup | |
552 | * | |
553 | * Returns 0 on success, negative on failure | |
554 | **/ | |
555 | int i40evf_setup_rx_descriptors(struct i40e_ring *rx_ring) | |
556 | { | |
557 | struct device *dev = rx_ring->dev; | |
558 | int bi_size; | |
559 | ||
560 | bi_size = sizeof(struct i40e_rx_buffer) * rx_ring->count; | |
561 | rx_ring->rx_bi = kzalloc(bi_size, GFP_KERNEL); | |
562 | if (!rx_ring->rx_bi) | |
563 | goto err; | |
564 | ||
565 | /* Round up to nearest 4K */ | |
566 | rx_ring->size = ring_is_16byte_desc_enabled(rx_ring) | |
567 | ? rx_ring->count * sizeof(union i40e_16byte_rx_desc) | |
568 | : rx_ring->count * sizeof(union i40e_32byte_rx_desc); | |
569 | rx_ring->size = ALIGN(rx_ring->size, 4096); | |
570 | rx_ring->desc = dma_alloc_coherent(dev, rx_ring->size, | |
571 | &rx_ring->dma, GFP_KERNEL); | |
572 | ||
573 | if (!rx_ring->desc) { | |
574 | dev_info(dev, "Unable to allocate memory for the Rx descriptor ring, size=%d\n", | |
575 | rx_ring->size); | |
576 | goto err; | |
577 | } | |
578 | ||
579 | rx_ring->next_to_clean = 0; | |
580 | rx_ring->next_to_use = 0; | |
581 | ||
582 | return 0; | |
583 | err: | |
584 | kfree(rx_ring->rx_bi); | |
585 | rx_ring->rx_bi = NULL; | |
586 | return -ENOMEM; | |
587 | } | |
588 | ||
589 | /** | |
590 | * i40e_release_rx_desc - Store the new tail and head values | |
591 | * @rx_ring: ring to bump | |
592 | * @val: new head index | |
593 | **/ | |
594 | static inline void i40e_release_rx_desc(struct i40e_ring *rx_ring, u32 val) | |
595 | { | |
596 | rx_ring->next_to_use = val; | |
597 | /* Force memory writes to complete before letting h/w | |
598 | * know there are new descriptors to fetch. (Only | |
599 | * applicable for weak-ordered memory model archs, | |
600 | * such as IA-64). | |
601 | */ | |
602 | wmb(); | |
603 | writel(val, rx_ring->tail); | |
604 | } | |
605 | ||
606 | /** | |
607 | * i40evf_alloc_rx_buffers - Replace used receive buffers; packet split | |
608 | * @rx_ring: ring to place buffers on | |
609 | * @cleaned_count: number of buffers to replace | |
610 | **/ | |
611 | void i40evf_alloc_rx_buffers(struct i40e_ring *rx_ring, u16 cleaned_count) | |
612 | { | |
613 | u16 i = rx_ring->next_to_use; | |
614 | union i40e_rx_desc *rx_desc; | |
615 | struct i40e_rx_buffer *bi; | |
616 | struct sk_buff *skb; | |
617 | ||
618 | /* do nothing if no valid netdev defined */ | |
619 | if (!rx_ring->netdev || !cleaned_count) | |
620 | return; | |
621 | ||
622 | while (cleaned_count--) { | |
623 | rx_desc = I40E_RX_DESC(rx_ring, i); | |
624 | bi = &rx_ring->rx_bi[i]; | |
625 | skb = bi->skb; | |
626 | ||
627 | if (!skb) { | |
628 | skb = netdev_alloc_skb_ip_align(rx_ring->netdev, | |
629 | rx_ring->rx_buf_len); | |
630 | if (!skb) { | |
631 | rx_ring->rx_stats.alloc_buff_failed++; | |
632 | goto no_buffers; | |
633 | } | |
634 | /* initialize queue mapping */ | |
635 | skb_record_rx_queue(skb, rx_ring->queue_index); | |
636 | bi->skb = skb; | |
637 | } | |
638 | ||
639 | if (!bi->dma) { | |
640 | bi->dma = dma_map_single(rx_ring->dev, | |
641 | skb->data, | |
642 | rx_ring->rx_buf_len, | |
643 | DMA_FROM_DEVICE); | |
644 | if (dma_mapping_error(rx_ring->dev, bi->dma)) { | |
645 | rx_ring->rx_stats.alloc_buff_failed++; | |
646 | bi->dma = 0; | |
647 | goto no_buffers; | |
648 | } | |
649 | } | |
650 | ||
651 | if (ring_is_ps_enabled(rx_ring)) { | |
652 | if (!bi->page) { | |
653 | bi->page = alloc_page(GFP_ATOMIC); | |
654 | if (!bi->page) { | |
655 | rx_ring->rx_stats.alloc_page_failed++; | |
656 | goto no_buffers; | |
657 | } | |
658 | } | |
659 | ||
660 | if (!bi->page_dma) { | |
661 | /* use a half page if we're re-using */ | |
662 | bi->page_offset ^= PAGE_SIZE / 2; | |
663 | bi->page_dma = dma_map_page(rx_ring->dev, | |
664 | bi->page, | |
665 | bi->page_offset, | |
666 | PAGE_SIZE / 2, | |
667 | DMA_FROM_DEVICE); | |
668 | if (dma_mapping_error(rx_ring->dev, | |
669 | bi->page_dma)) { | |
670 | rx_ring->rx_stats.alloc_page_failed++; | |
671 | bi->page_dma = 0; | |
672 | goto no_buffers; | |
673 | } | |
674 | } | |
675 | ||
676 | /* Refresh the desc even if buffer_addrs didn't change | |
677 | * because each write-back erases this info. | |
678 | */ | |
679 | rx_desc->read.pkt_addr = cpu_to_le64(bi->page_dma); | |
680 | rx_desc->read.hdr_addr = cpu_to_le64(bi->dma); | |
681 | } else { | |
682 | rx_desc->read.pkt_addr = cpu_to_le64(bi->dma); | |
683 | rx_desc->read.hdr_addr = 0; | |
684 | } | |
685 | i++; | |
686 | if (i == rx_ring->count) | |
687 | i = 0; | |
688 | } | |
689 | ||
690 | no_buffers: | |
691 | if (rx_ring->next_to_use != i) | |
692 | i40e_release_rx_desc(rx_ring, i); | |
693 | } | |
694 | ||
695 | /** | |
696 | * i40e_receive_skb - Send a completed packet up the stack | |
697 | * @rx_ring: rx ring in play | |
698 | * @skb: packet to send up | |
699 | * @vlan_tag: vlan tag for packet | |
700 | **/ | |
701 | static void i40e_receive_skb(struct i40e_ring *rx_ring, | |
702 | struct sk_buff *skb, u16 vlan_tag) | |
703 | { | |
704 | struct i40e_q_vector *q_vector = rx_ring->q_vector; | |
705 | struct i40e_vsi *vsi = rx_ring->vsi; | |
706 | u64 flags = vsi->back->flags; | |
707 | ||
708 | if (vlan_tag & VLAN_VID_MASK) | |
709 | __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tag); | |
710 | ||
711 | if (flags & I40E_FLAG_IN_NETPOLL) | |
712 | netif_rx(skb); | |
713 | else | |
714 | napi_gro_receive(&q_vector->napi, skb); | |
715 | } | |
716 | ||
717 | /** | |
718 | * i40e_rx_checksum - Indicate in skb if hw indicated a good cksum | |
719 | * @vsi: the VSI we care about | |
720 | * @skb: skb currently being received and modified | |
721 | * @rx_status: status value of last descriptor in packet | |
722 | * @rx_error: error value of last descriptor in packet | |
723 | * @rx_ptype: ptype value of last descriptor in packet | |
724 | **/ | |
725 | static inline void i40e_rx_checksum(struct i40e_vsi *vsi, | |
726 | struct sk_buff *skb, | |
727 | u32 rx_status, | |
728 | u32 rx_error, | |
729 | u16 rx_ptype) | |
730 | { | |
731 | bool ipv4_tunnel, ipv6_tunnel; | |
732 | __wsum rx_udp_csum; | |
733 | __sum16 csum; | |
734 | struct iphdr *iph; | |
735 | ||
736 | ipv4_tunnel = (rx_ptype > I40E_RX_PTYPE_GRENAT4_MAC_PAY3) && | |
737 | (rx_ptype < I40E_RX_PTYPE_GRENAT4_MACVLAN_IPV6_ICMP_PAY4); | |
738 | ipv6_tunnel = (rx_ptype > I40E_RX_PTYPE_GRENAT6_MAC_PAY3) && | |
739 | (rx_ptype < I40E_RX_PTYPE_GRENAT6_MACVLAN_IPV6_ICMP_PAY4); | |
740 | ||
741 | skb->encapsulation = ipv4_tunnel || ipv6_tunnel; | |
742 | skb->ip_summed = CHECKSUM_NONE; | |
743 | ||
744 | /* Rx csum enabled and ip headers found? */ | |
745 | if (!(vsi->netdev->features & NETIF_F_RXCSUM && | |
746 | rx_status & (1 << I40E_RX_DESC_STATUS_L3L4P_SHIFT))) | |
747 | return; | |
748 | ||
ddf1d0d7 | 749 | /* likely incorrect csum if alternate IP extension headers found */ |
7f12ad74 GR |
750 | if (rx_status & (1 << I40E_RX_DESC_STATUS_IPV6EXADD_SHIFT)) |
751 | return; | |
752 | ||
753 | /* IP or L4 or outmost IP checksum error */ | |
754 | if (rx_error & ((1 << I40E_RX_DESC_ERROR_IPE_SHIFT) | | |
755 | (1 << I40E_RX_DESC_ERROR_L4E_SHIFT) | | |
756 | (1 << I40E_RX_DESC_ERROR_EIPE_SHIFT))) { | |
757 | vsi->back->hw_csum_rx_error++; | |
758 | return; | |
759 | } | |
760 | ||
761 | if (ipv4_tunnel && | |
762 | !(rx_status & (1 << I40E_RX_DESC_STATUS_UDP_0_SHIFT))) { | |
763 | /* If VXLAN traffic has an outer UDPv4 checksum we need to check | |
764 | * it in the driver, hardware does not do it for us. | |
765 | * Since L3L4P bit was set we assume a valid IHL value (>=5) | |
766 | * so the total length of IPv4 header is IHL*4 bytes | |
767 | */ | |
768 | skb->transport_header = skb->mac_header + | |
769 | sizeof(struct ethhdr) + | |
770 | (ip_hdr(skb)->ihl * 4); | |
771 | ||
772 | /* Add 4 bytes for VLAN tagged packets */ | |
773 | skb->transport_header += (skb->protocol == htons(ETH_P_8021Q) || | |
774 | skb->protocol == htons(ETH_P_8021AD)) | |
775 | ? VLAN_HLEN : 0; | |
776 | ||
777 | rx_udp_csum = udp_csum(skb); | |
778 | iph = ip_hdr(skb); | |
779 | csum = csum_tcpudp_magic( | |
780 | iph->saddr, iph->daddr, | |
781 | (skb->len - skb_transport_offset(skb)), | |
782 | IPPROTO_UDP, rx_udp_csum); | |
783 | ||
784 | if (udp_hdr(skb)->check != csum) { | |
785 | vsi->back->hw_csum_rx_error++; | |
786 | return; | |
787 | } | |
788 | } | |
789 | ||
790 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
791 | } | |
792 | ||
793 | /** | |
794 | * i40e_rx_hash - returns the hash value from the Rx descriptor | |
795 | * @ring: descriptor ring | |
796 | * @rx_desc: specific descriptor | |
797 | **/ | |
798 | static inline u32 i40e_rx_hash(struct i40e_ring *ring, | |
799 | union i40e_rx_desc *rx_desc) | |
800 | { | |
801 | const __le64 rss_mask = | |
802 | cpu_to_le64((u64)I40E_RX_DESC_FLTSTAT_RSS_HASH << | |
803 | I40E_RX_DESC_STATUS_FLTSTAT_SHIFT); | |
804 | ||
805 | if ((ring->netdev->features & NETIF_F_RXHASH) && | |
806 | (rx_desc->wb.qword1.status_error_len & rss_mask) == rss_mask) | |
807 | return le32_to_cpu(rx_desc->wb.qword0.hi_dword.rss); | |
808 | else | |
809 | return 0; | |
810 | } | |
811 | ||
206812b5 JB |
812 | /** |
813 | * i40e_ptype_to_hash - get a hash type | |
814 | * @ptype: the ptype value from the descriptor | |
815 | * | |
816 | * Returns a hash type to be used by skb_set_hash | |
817 | **/ | |
818 | static inline enum pkt_hash_types i40e_ptype_to_hash(u8 ptype) | |
819 | { | |
820 | struct i40e_rx_ptype_decoded decoded = decode_rx_desc_ptype(ptype); | |
821 | ||
822 | if (!decoded.known) | |
823 | return PKT_HASH_TYPE_NONE; | |
824 | ||
825 | if (decoded.outer_ip == I40E_RX_PTYPE_OUTER_IP && | |
826 | decoded.payload_layer == I40E_RX_PTYPE_PAYLOAD_LAYER_PAY4) | |
827 | return PKT_HASH_TYPE_L4; | |
828 | else if (decoded.outer_ip == I40E_RX_PTYPE_OUTER_IP && | |
829 | decoded.payload_layer == I40E_RX_PTYPE_PAYLOAD_LAYER_PAY3) | |
830 | return PKT_HASH_TYPE_L3; | |
831 | else | |
832 | return PKT_HASH_TYPE_L2; | |
833 | } | |
834 | ||
7f12ad74 GR |
835 | /** |
836 | * i40e_clean_rx_irq - Reclaim resources after receive completes | |
837 | * @rx_ring: rx ring to clean | |
838 | * @budget: how many cleans we're allowed | |
839 | * | |
840 | * Returns true if there's any budget left (e.g. the clean is finished) | |
841 | **/ | |
842 | static int i40e_clean_rx_irq(struct i40e_ring *rx_ring, int budget) | |
843 | { | |
844 | unsigned int total_rx_bytes = 0, total_rx_packets = 0; | |
845 | u16 rx_packet_len, rx_header_len, rx_sph, rx_hbo; | |
846 | u16 cleaned_count = I40E_DESC_UNUSED(rx_ring); | |
847 | const int current_node = numa_node_id(); | |
848 | struct i40e_vsi *vsi = rx_ring->vsi; | |
849 | u16 i = rx_ring->next_to_clean; | |
850 | union i40e_rx_desc *rx_desc; | |
851 | u32 rx_error, rx_status; | |
206812b5 | 852 | u8 rx_ptype; |
7f12ad74 | 853 | u64 qword; |
7f12ad74 GR |
854 | |
855 | rx_desc = I40E_RX_DESC(rx_ring, i); | |
856 | qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len); | |
af1a2a9c JB |
857 | rx_status = (qword & I40E_RXD_QW1_STATUS_MASK) >> |
858 | I40E_RXD_QW1_STATUS_SHIFT; | |
7f12ad74 GR |
859 | |
860 | while (rx_status & (1 << I40E_RX_DESC_STATUS_DD_SHIFT)) { | |
861 | union i40e_rx_desc *next_rxd; | |
862 | struct i40e_rx_buffer *rx_bi; | |
863 | struct sk_buff *skb; | |
864 | u16 vlan_tag; | |
865 | rx_bi = &rx_ring->rx_bi[i]; | |
866 | skb = rx_bi->skb; | |
867 | prefetch(skb->data); | |
868 | ||
869 | rx_packet_len = (qword & I40E_RXD_QW1_LENGTH_PBUF_MASK) >> | |
870 | I40E_RXD_QW1_LENGTH_PBUF_SHIFT; | |
871 | rx_header_len = (qword & I40E_RXD_QW1_LENGTH_HBUF_MASK) >> | |
872 | I40E_RXD_QW1_LENGTH_HBUF_SHIFT; | |
873 | rx_sph = (qword & I40E_RXD_QW1_LENGTH_SPH_MASK) >> | |
874 | I40E_RXD_QW1_LENGTH_SPH_SHIFT; | |
875 | ||
876 | rx_error = (qword & I40E_RXD_QW1_ERROR_MASK) >> | |
877 | I40E_RXD_QW1_ERROR_SHIFT; | |
878 | rx_hbo = rx_error & (1 << I40E_RX_DESC_ERROR_HBO_SHIFT); | |
879 | rx_error &= ~(1 << I40E_RX_DESC_ERROR_HBO_SHIFT); | |
880 | ||
881 | rx_ptype = (qword & I40E_RXD_QW1_PTYPE_MASK) >> | |
882 | I40E_RXD_QW1_PTYPE_SHIFT; | |
883 | rx_bi->skb = NULL; | |
884 | ||
885 | /* This memory barrier is needed to keep us from reading | |
886 | * any other fields out of the rx_desc until we know the | |
887 | * STATUS_DD bit is set | |
888 | */ | |
889 | rmb(); | |
890 | ||
891 | /* Get the header and possibly the whole packet | |
892 | * If this is an skb from previous receive dma will be 0 | |
893 | */ | |
894 | if (rx_bi->dma) { | |
895 | u16 len; | |
896 | ||
897 | if (rx_hbo) | |
898 | len = I40E_RX_HDR_SIZE; | |
899 | else if (rx_sph) | |
900 | len = rx_header_len; | |
901 | else if (rx_packet_len) | |
902 | len = rx_packet_len; /* 1buf/no split found */ | |
903 | else | |
904 | len = rx_header_len; /* split always mode */ | |
905 | ||
906 | skb_put(skb, len); | |
907 | dma_unmap_single(rx_ring->dev, | |
908 | rx_bi->dma, | |
909 | rx_ring->rx_buf_len, | |
910 | DMA_FROM_DEVICE); | |
911 | rx_bi->dma = 0; | |
912 | } | |
913 | ||
914 | /* Get the rest of the data if this was a header split */ | |
915 | if (ring_is_ps_enabled(rx_ring) && rx_packet_len) { | |
916 | ||
917 | skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, | |
918 | rx_bi->page, | |
919 | rx_bi->page_offset, | |
920 | rx_packet_len); | |
921 | ||
922 | skb->len += rx_packet_len; | |
923 | skb->data_len += rx_packet_len; | |
924 | skb->truesize += rx_packet_len; | |
925 | ||
926 | if ((page_count(rx_bi->page) == 1) && | |
927 | (page_to_nid(rx_bi->page) == current_node)) | |
928 | get_page(rx_bi->page); | |
929 | else | |
930 | rx_bi->page = NULL; | |
931 | ||
932 | dma_unmap_page(rx_ring->dev, | |
933 | rx_bi->page_dma, | |
934 | PAGE_SIZE / 2, | |
935 | DMA_FROM_DEVICE); | |
936 | rx_bi->page_dma = 0; | |
937 | } | |
938 | I40E_RX_NEXT_DESC_PREFETCH(rx_ring, i, next_rxd); | |
939 | ||
940 | if (unlikely( | |
941 | !(rx_status & (1 << I40E_RX_DESC_STATUS_EOF_SHIFT)))) { | |
942 | struct i40e_rx_buffer *next_buffer; | |
943 | ||
944 | next_buffer = &rx_ring->rx_bi[i]; | |
945 | ||
946 | if (ring_is_ps_enabled(rx_ring)) { | |
947 | rx_bi->skb = next_buffer->skb; | |
948 | rx_bi->dma = next_buffer->dma; | |
949 | next_buffer->skb = skb; | |
950 | next_buffer->dma = 0; | |
951 | } | |
952 | rx_ring->rx_stats.non_eop_descs++; | |
953 | goto next_desc; | |
954 | } | |
955 | ||
956 | /* ERR_MASK will only have valid bits if EOP set */ | |
957 | if (unlikely(rx_error & (1 << I40E_RX_DESC_ERROR_RXE_SHIFT))) { | |
958 | dev_kfree_skb_any(skb); | |
959 | goto next_desc; | |
960 | } | |
961 | ||
206812b5 JB |
962 | skb_set_hash(skb, i40e_rx_hash(rx_ring, rx_desc), |
963 | i40e_ptype_to_hash(rx_ptype)); | |
7f12ad74 GR |
964 | /* probably a little skewed due to removing CRC */ |
965 | total_rx_bytes += skb->len; | |
966 | total_rx_packets++; | |
967 | ||
968 | skb->protocol = eth_type_trans(skb, rx_ring->netdev); | |
969 | ||
970 | i40e_rx_checksum(vsi, skb, rx_status, rx_error, rx_ptype); | |
971 | ||
972 | vlan_tag = rx_status & (1 << I40E_RX_DESC_STATUS_L2TAG1P_SHIFT) | |
973 | ? le16_to_cpu(rx_desc->wb.qword0.lo_dword.l2tag1) | |
974 | : 0; | |
975 | i40e_receive_skb(rx_ring, skb, vlan_tag); | |
976 | ||
977 | rx_ring->netdev->last_rx = jiffies; | |
978 | budget--; | |
979 | next_desc: | |
980 | rx_desc->wb.qword1.status_error_len = 0; | |
981 | if (!budget) | |
982 | break; | |
983 | ||
984 | cleaned_count++; | |
985 | /* return some buffers to hardware, one at a time is too slow */ | |
986 | if (cleaned_count >= I40E_RX_BUFFER_WRITE) { | |
987 | i40evf_alloc_rx_buffers(rx_ring, cleaned_count); | |
988 | cleaned_count = 0; | |
989 | } | |
990 | ||
991 | /* use prefetched values */ | |
992 | rx_desc = next_rxd; | |
993 | qword = le64_to_cpu(rx_desc->wb.qword1.status_error_len); | |
994 | rx_status = (qword & I40E_RXD_QW1_STATUS_MASK) >> | |
995 | I40E_RXD_QW1_STATUS_SHIFT; | |
996 | } | |
997 | ||
998 | rx_ring->next_to_clean = i; | |
999 | u64_stats_update_begin(&rx_ring->syncp); | |
1000 | rx_ring->stats.packets += total_rx_packets; | |
1001 | rx_ring->stats.bytes += total_rx_bytes; | |
1002 | u64_stats_update_end(&rx_ring->syncp); | |
1003 | rx_ring->q_vector->rx.total_packets += total_rx_packets; | |
1004 | rx_ring->q_vector->rx.total_bytes += total_rx_bytes; | |
1005 | ||
1006 | if (cleaned_count) | |
1007 | i40evf_alloc_rx_buffers(rx_ring, cleaned_count); | |
1008 | ||
1009 | return budget > 0; | |
1010 | } | |
1011 | ||
1012 | /** | |
1013 | * i40evf_napi_poll - NAPI polling Rx/Tx cleanup routine | |
1014 | * @napi: napi struct with our devices info in it | |
1015 | * @budget: amount of work driver is allowed to do this pass, in packets | |
1016 | * | |
1017 | * This function will clean all queues associated with a q_vector. | |
1018 | * | |
1019 | * Returns the amount of work done | |
1020 | **/ | |
1021 | int i40evf_napi_poll(struct napi_struct *napi, int budget) | |
1022 | { | |
1023 | struct i40e_q_vector *q_vector = | |
1024 | container_of(napi, struct i40e_q_vector, napi); | |
1025 | struct i40e_vsi *vsi = q_vector->vsi; | |
1026 | struct i40e_ring *ring; | |
1027 | bool clean_complete = true; | |
1028 | int budget_per_ring; | |
1029 | ||
1030 | if (test_bit(__I40E_DOWN, &vsi->state)) { | |
1031 | napi_complete(napi); | |
1032 | return 0; | |
1033 | } | |
1034 | ||
1035 | /* Since the actual Tx work is minimal, we can give the Tx a larger | |
1036 | * budget and be more aggressive about cleaning up the Tx descriptors. | |
1037 | */ | |
1038 | i40e_for_each_ring(ring, q_vector->tx) | |
1039 | clean_complete &= i40e_clean_tx_irq(ring, vsi->work_limit); | |
1040 | ||
1041 | /* We attempt to distribute budget to each Rx queue fairly, but don't | |
1042 | * allow the budget to go below 1 because that would exit polling early. | |
1043 | */ | |
1044 | budget_per_ring = max(budget/q_vector->num_ringpairs, 1); | |
1045 | ||
1046 | i40e_for_each_ring(ring, q_vector->rx) | |
1047 | clean_complete &= i40e_clean_rx_irq(ring, budget_per_ring); | |
1048 | ||
1049 | /* If work not completed, return budget and polling will return */ | |
1050 | if (!clean_complete) | |
1051 | return budget; | |
1052 | ||
1053 | /* Work is done so exit the polling mode and re-enable the interrupt */ | |
1054 | napi_complete(napi); | |
1055 | if (ITR_IS_DYNAMIC(vsi->rx_itr_setting) || | |
1056 | ITR_IS_DYNAMIC(vsi->tx_itr_setting)) | |
1057 | i40e_update_dynamic_itr(q_vector); | |
1058 | ||
1059 | if (!test_bit(__I40E_DOWN, &vsi->state)) | |
1060 | i40evf_irq_enable_queues(vsi->back, 1 << q_vector->v_idx); | |
1061 | ||
1062 | return 0; | |
1063 | } | |
1064 | ||
1065 | /** | |
1066 | * i40e_tx_prepare_vlan_flags - prepare generic TX VLAN tagging flags for HW | |
1067 | * @skb: send buffer | |
1068 | * @tx_ring: ring to send buffer on | |
1069 | * @flags: the tx flags to be set | |
1070 | * | |
1071 | * Checks the skb and set up correspondingly several generic transmit flags | |
1072 | * related to VLAN tagging for the HW, such as VLAN, DCB, etc. | |
1073 | * | |
1074 | * Returns error code indicate the frame should be dropped upon error and the | |
1075 | * otherwise returns 0 to indicate the flags has been set properly. | |
1076 | **/ | |
1077 | static int i40e_tx_prepare_vlan_flags(struct sk_buff *skb, | |
1078 | struct i40e_ring *tx_ring, | |
1079 | u32 *flags) | |
1080 | { | |
1081 | __be16 protocol = skb->protocol; | |
1082 | u32 tx_flags = 0; | |
1083 | ||
1084 | /* if we have a HW VLAN tag being added, default to the HW one */ | |
1085 | if (vlan_tx_tag_present(skb)) { | |
1086 | tx_flags |= vlan_tx_tag_get(skb) << I40E_TX_FLAGS_VLAN_SHIFT; | |
1087 | tx_flags |= I40E_TX_FLAGS_HW_VLAN; | |
1088 | /* else if it is a SW VLAN, check the next protocol and store the tag */ | |
1089 | } else if (protocol == htons(ETH_P_8021Q)) { | |
1090 | struct vlan_hdr *vhdr, _vhdr; | |
1091 | vhdr = skb_header_pointer(skb, ETH_HLEN, sizeof(_vhdr), &_vhdr); | |
1092 | if (!vhdr) | |
1093 | return -EINVAL; | |
1094 | ||
1095 | protocol = vhdr->h_vlan_encapsulated_proto; | |
1096 | tx_flags |= ntohs(vhdr->h_vlan_TCI) << I40E_TX_FLAGS_VLAN_SHIFT; | |
1097 | tx_flags |= I40E_TX_FLAGS_SW_VLAN; | |
1098 | } | |
1099 | ||
1100 | *flags = tx_flags; | |
1101 | return 0; | |
1102 | } | |
1103 | ||
1104 | /** | |
1105 | * i40e_tso - set up the tso context descriptor | |
1106 | * @tx_ring: ptr to the ring to send | |
1107 | * @skb: ptr to the skb we're sending | |
1108 | * @tx_flags: the collected send information | |
1109 | * @protocol: the send protocol | |
1110 | * @hdr_len: ptr to the size of the packet header | |
1111 | * @cd_tunneling: ptr to context descriptor bits | |
1112 | * | |
1113 | * Returns 0 if no TSO can happen, 1 if tso is going, or error | |
1114 | **/ | |
1115 | static int i40e_tso(struct i40e_ring *tx_ring, struct sk_buff *skb, | |
1116 | u32 tx_flags, __be16 protocol, u8 *hdr_len, | |
1117 | u64 *cd_type_cmd_tso_mss, u32 *cd_tunneling) | |
1118 | { | |
1119 | u32 cd_cmd, cd_tso_len, cd_mss; | |
fe6d4aa4 | 1120 | struct ipv6hdr *ipv6h; |
7f12ad74 GR |
1121 | struct tcphdr *tcph; |
1122 | struct iphdr *iph; | |
1123 | u32 l4len; | |
1124 | int err; | |
7f12ad74 GR |
1125 | |
1126 | if (!skb_is_gso(skb)) | |
1127 | return 0; | |
1128 | ||
fe6d4aa4 FR |
1129 | err = skb_cow_head(skb, 0); |
1130 | if (err < 0) | |
1131 | return err; | |
7f12ad74 GR |
1132 | |
1133 | if (protocol == htons(ETH_P_IP)) { | |
1134 | iph = skb->encapsulation ? inner_ip_hdr(skb) : ip_hdr(skb); | |
1135 | tcph = skb->encapsulation ? inner_tcp_hdr(skb) : tcp_hdr(skb); | |
1136 | iph->tot_len = 0; | |
1137 | iph->check = 0; | |
1138 | tcph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, | |
1139 | 0, IPPROTO_TCP, 0); | |
1140 | } else if (skb_is_gso_v6(skb)) { | |
1141 | ||
1142 | ipv6h = skb->encapsulation ? inner_ipv6_hdr(skb) | |
1143 | : ipv6_hdr(skb); | |
1144 | tcph = skb->encapsulation ? inner_tcp_hdr(skb) : tcp_hdr(skb); | |
1145 | ipv6h->payload_len = 0; | |
1146 | tcph->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, | |
1147 | 0, IPPROTO_TCP, 0); | |
1148 | } | |
1149 | ||
1150 | l4len = skb->encapsulation ? inner_tcp_hdrlen(skb) : tcp_hdrlen(skb); | |
1151 | *hdr_len = (skb->encapsulation | |
1152 | ? (skb_inner_transport_header(skb) - skb->data) | |
1153 | : skb_transport_offset(skb)) + l4len; | |
1154 | ||
1155 | /* find the field values */ | |
1156 | cd_cmd = I40E_TX_CTX_DESC_TSO; | |
1157 | cd_tso_len = skb->len - *hdr_len; | |
1158 | cd_mss = skb_shinfo(skb)->gso_size; | |
1159 | *cd_type_cmd_tso_mss |= ((u64)cd_cmd << I40E_TXD_CTX_QW1_CMD_SHIFT) | | |
1160 | ((u64)cd_tso_len << | |
1161 | I40E_TXD_CTX_QW1_TSO_LEN_SHIFT) | | |
1162 | ((u64)cd_mss << I40E_TXD_CTX_QW1_MSS_SHIFT); | |
1163 | return 1; | |
1164 | } | |
1165 | ||
1166 | /** | |
1167 | * i40e_tx_enable_csum - Enable Tx checksum offloads | |
1168 | * @skb: send buffer | |
1169 | * @tx_flags: Tx flags currently set | |
1170 | * @td_cmd: Tx descriptor command bits to set | |
1171 | * @td_offset: Tx descriptor header offsets to set | |
1172 | * @cd_tunneling: ptr to context desc bits | |
1173 | **/ | |
1174 | static void i40e_tx_enable_csum(struct sk_buff *skb, u32 tx_flags, | |
1175 | u32 *td_cmd, u32 *td_offset, | |
1176 | struct i40e_ring *tx_ring, | |
1177 | u32 *cd_tunneling) | |
1178 | { | |
1179 | struct ipv6hdr *this_ipv6_hdr; | |
1180 | unsigned int this_tcp_hdrlen; | |
1181 | struct iphdr *this_ip_hdr; | |
1182 | u32 network_hdr_len; | |
1183 | u8 l4_hdr = 0; | |
1184 | ||
1185 | if (skb->encapsulation) { | |
1186 | network_hdr_len = skb_inner_network_header_len(skb); | |
1187 | this_ip_hdr = inner_ip_hdr(skb); | |
1188 | this_ipv6_hdr = inner_ipv6_hdr(skb); | |
1189 | this_tcp_hdrlen = inner_tcp_hdrlen(skb); | |
1190 | ||
1191 | if (tx_flags & I40E_TX_FLAGS_IPV4) { | |
1192 | ||
1193 | if (tx_flags & I40E_TX_FLAGS_TSO) { | |
1194 | *cd_tunneling |= I40E_TX_CTX_EXT_IP_IPV4; | |
1195 | ip_hdr(skb)->check = 0; | |
1196 | } else { | |
1197 | *cd_tunneling |= | |
1198 | I40E_TX_CTX_EXT_IP_IPV4_NO_CSUM; | |
1199 | } | |
1200 | } else if (tx_flags & I40E_TX_FLAGS_IPV6) { | |
1201 | if (tx_flags & I40E_TX_FLAGS_TSO) { | |
1202 | *cd_tunneling |= I40E_TX_CTX_EXT_IP_IPV6; | |
1203 | ip_hdr(skb)->check = 0; | |
1204 | } else { | |
1205 | *cd_tunneling |= | |
1206 | I40E_TX_CTX_EXT_IP_IPV4_NO_CSUM; | |
1207 | } | |
1208 | } | |
1209 | ||
1210 | /* Now set the ctx descriptor fields */ | |
1211 | *cd_tunneling |= (skb_network_header_len(skb) >> 2) << | |
1212 | I40E_TXD_CTX_QW0_EXT_IPLEN_SHIFT | | |
1213 | I40E_TXD_CTX_UDP_TUNNELING | | |
1214 | ((skb_inner_network_offset(skb) - | |
1215 | skb_transport_offset(skb)) >> 1) << | |
1216 | I40E_TXD_CTX_QW0_NATLEN_SHIFT; | |
1217 | ||
1218 | } else { | |
1219 | network_hdr_len = skb_network_header_len(skb); | |
1220 | this_ip_hdr = ip_hdr(skb); | |
1221 | this_ipv6_hdr = ipv6_hdr(skb); | |
1222 | this_tcp_hdrlen = tcp_hdrlen(skb); | |
1223 | } | |
1224 | ||
1225 | /* Enable IP checksum offloads */ | |
1226 | if (tx_flags & I40E_TX_FLAGS_IPV4) { | |
1227 | l4_hdr = this_ip_hdr->protocol; | |
1228 | /* the stack computes the IP header already, the only time we | |
1229 | * need the hardware to recompute it is in the case of TSO. | |
1230 | */ | |
1231 | if (tx_flags & I40E_TX_FLAGS_TSO) { | |
1232 | *td_cmd |= I40E_TX_DESC_CMD_IIPT_IPV4_CSUM; | |
1233 | this_ip_hdr->check = 0; | |
1234 | } else { | |
1235 | *td_cmd |= I40E_TX_DESC_CMD_IIPT_IPV4; | |
1236 | } | |
1237 | /* Now set the td_offset for IP header length */ | |
1238 | *td_offset = (network_hdr_len >> 2) << | |
1239 | I40E_TX_DESC_LENGTH_IPLEN_SHIFT; | |
1240 | } else if (tx_flags & I40E_TX_FLAGS_IPV6) { | |
1241 | l4_hdr = this_ipv6_hdr->nexthdr; | |
1242 | *td_cmd |= I40E_TX_DESC_CMD_IIPT_IPV6; | |
1243 | /* Now set the td_offset for IP header length */ | |
1244 | *td_offset = (network_hdr_len >> 2) << | |
1245 | I40E_TX_DESC_LENGTH_IPLEN_SHIFT; | |
1246 | } | |
1247 | /* words in MACLEN + dwords in IPLEN + dwords in L4Len */ | |
1248 | *td_offset |= (skb_network_offset(skb) >> 1) << | |
1249 | I40E_TX_DESC_LENGTH_MACLEN_SHIFT; | |
1250 | ||
1251 | /* Enable L4 checksum offloads */ | |
1252 | switch (l4_hdr) { | |
1253 | case IPPROTO_TCP: | |
1254 | /* enable checksum offloads */ | |
1255 | *td_cmd |= I40E_TX_DESC_CMD_L4T_EOFT_TCP; | |
1256 | *td_offset |= (this_tcp_hdrlen >> 2) << | |
1257 | I40E_TX_DESC_LENGTH_L4_FC_LEN_SHIFT; | |
1258 | break; | |
1259 | case IPPROTO_SCTP: | |
1260 | /* enable SCTP checksum offload */ | |
1261 | *td_cmd |= I40E_TX_DESC_CMD_L4T_EOFT_SCTP; | |
1262 | *td_offset |= (sizeof(struct sctphdr) >> 2) << | |
1263 | I40E_TX_DESC_LENGTH_L4_FC_LEN_SHIFT; | |
1264 | break; | |
1265 | case IPPROTO_UDP: | |
1266 | /* enable UDP checksum offload */ | |
1267 | *td_cmd |= I40E_TX_DESC_CMD_L4T_EOFT_UDP; | |
1268 | *td_offset |= (sizeof(struct udphdr) >> 2) << | |
1269 | I40E_TX_DESC_LENGTH_L4_FC_LEN_SHIFT; | |
1270 | break; | |
1271 | default: | |
1272 | break; | |
1273 | } | |
1274 | } | |
1275 | ||
1276 | /** | |
1277 | * i40e_create_tx_ctx Build the Tx context descriptor | |
1278 | * @tx_ring: ring to create the descriptor on | |
1279 | * @cd_type_cmd_tso_mss: Quad Word 1 | |
1280 | * @cd_tunneling: Quad Word 0 - bits 0-31 | |
1281 | * @cd_l2tag2: Quad Word 0 - bits 32-63 | |
1282 | **/ | |
1283 | static void i40e_create_tx_ctx(struct i40e_ring *tx_ring, | |
1284 | const u64 cd_type_cmd_tso_mss, | |
1285 | const u32 cd_tunneling, const u32 cd_l2tag2) | |
1286 | { | |
1287 | struct i40e_tx_context_desc *context_desc; | |
1288 | int i = tx_ring->next_to_use; | |
1289 | ||
ff40dd5d JB |
1290 | if ((cd_type_cmd_tso_mss == I40E_TX_DESC_DTYPE_CONTEXT) && |
1291 | !cd_tunneling && !cd_l2tag2) | |
7f12ad74 GR |
1292 | return; |
1293 | ||
1294 | /* grab the next descriptor */ | |
1295 | context_desc = I40E_TX_CTXTDESC(tx_ring, i); | |
1296 | ||
1297 | i++; | |
1298 | tx_ring->next_to_use = (i < tx_ring->count) ? i : 0; | |
1299 | ||
1300 | /* cpu_to_le32 and assign to struct fields */ | |
1301 | context_desc->tunneling_params = cpu_to_le32(cd_tunneling); | |
1302 | context_desc->l2tag2 = cpu_to_le16(cd_l2tag2); | |
1303 | context_desc->type_cmd_tso_mss = cpu_to_le64(cd_type_cmd_tso_mss); | |
1304 | } | |
1305 | ||
1306 | /** | |
1307 | * i40e_tx_map - Build the Tx descriptor | |
1308 | * @tx_ring: ring to send buffer on | |
1309 | * @skb: send buffer | |
1310 | * @first: first buffer info buffer to use | |
1311 | * @tx_flags: collected send information | |
1312 | * @hdr_len: size of the packet header | |
1313 | * @td_cmd: the command field in the descriptor | |
1314 | * @td_offset: offset for checksum or crc | |
1315 | **/ | |
1316 | static void i40e_tx_map(struct i40e_ring *tx_ring, struct sk_buff *skb, | |
1317 | struct i40e_tx_buffer *first, u32 tx_flags, | |
1318 | const u8 hdr_len, u32 td_cmd, u32 td_offset) | |
1319 | { | |
1320 | unsigned int data_len = skb->data_len; | |
1321 | unsigned int size = skb_headlen(skb); | |
1322 | struct skb_frag_struct *frag; | |
1323 | struct i40e_tx_buffer *tx_bi; | |
1324 | struct i40e_tx_desc *tx_desc; | |
1325 | u16 i = tx_ring->next_to_use; | |
1326 | u32 td_tag = 0; | |
1327 | dma_addr_t dma; | |
1328 | u16 gso_segs; | |
1329 | ||
1330 | if (tx_flags & I40E_TX_FLAGS_HW_VLAN) { | |
1331 | td_cmd |= I40E_TX_DESC_CMD_IL2TAG1; | |
1332 | td_tag = (tx_flags & I40E_TX_FLAGS_VLAN_MASK) >> | |
1333 | I40E_TX_FLAGS_VLAN_SHIFT; | |
1334 | } | |
1335 | ||
1336 | if (tx_flags & (I40E_TX_FLAGS_TSO | I40E_TX_FLAGS_FSO)) | |
1337 | gso_segs = skb_shinfo(skb)->gso_segs; | |
1338 | else | |
1339 | gso_segs = 1; | |
1340 | ||
1341 | /* multiply data chunks by size of headers */ | |
1342 | first->bytecount = skb->len - hdr_len + (gso_segs * hdr_len); | |
1343 | first->gso_segs = gso_segs; | |
1344 | first->skb = skb; | |
1345 | first->tx_flags = tx_flags; | |
1346 | ||
1347 | dma = dma_map_single(tx_ring->dev, skb->data, size, DMA_TO_DEVICE); | |
1348 | ||
1349 | tx_desc = I40E_TX_DESC(tx_ring, i); | |
1350 | tx_bi = first; | |
1351 | ||
1352 | for (frag = &skb_shinfo(skb)->frags[0];; frag++) { | |
1353 | if (dma_mapping_error(tx_ring->dev, dma)) | |
1354 | goto dma_error; | |
1355 | ||
1356 | /* record length, and DMA address */ | |
1357 | dma_unmap_len_set(tx_bi, len, size); | |
1358 | dma_unmap_addr_set(tx_bi, dma, dma); | |
1359 | ||
1360 | tx_desc->buffer_addr = cpu_to_le64(dma); | |
1361 | ||
1362 | while (unlikely(size > I40E_MAX_DATA_PER_TXD)) { | |
1363 | tx_desc->cmd_type_offset_bsz = | |
1364 | build_ctob(td_cmd, td_offset, | |
1365 | I40E_MAX_DATA_PER_TXD, td_tag); | |
1366 | ||
1367 | tx_desc++; | |
1368 | i++; | |
1369 | if (i == tx_ring->count) { | |
1370 | tx_desc = I40E_TX_DESC(tx_ring, 0); | |
1371 | i = 0; | |
1372 | } | |
1373 | ||
1374 | dma += I40E_MAX_DATA_PER_TXD; | |
1375 | size -= I40E_MAX_DATA_PER_TXD; | |
1376 | ||
1377 | tx_desc->buffer_addr = cpu_to_le64(dma); | |
1378 | } | |
1379 | ||
1380 | if (likely(!data_len)) | |
1381 | break; | |
1382 | ||
1383 | tx_desc->cmd_type_offset_bsz = build_ctob(td_cmd, td_offset, | |
1384 | size, td_tag); | |
1385 | ||
1386 | tx_desc++; | |
1387 | i++; | |
1388 | if (i == tx_ring->count) { | |
1389 | tx_desc = I40E_TX_DESC(tx_ring, 0); | |
1390 | i = 0; | |
1391 | } | |
1392 | ||
1393 | size = skb_frag_size(frag); | |
1394 | data_len -= size; | |
1395 | ||
1396 | dma = skb_frag_dma_map(tx_ring->dev, frag, 0, size, | |
1397 | DMA_TO_DEVICE); | |
1398 | ||
1399 | tx_bi = &tx_ring->tx_bi[i]; | |
1400 | } | |
1401 | ||
1943d8ba JB |
1402 | /* Place RS bit on last descriptor of any packet that spans across the |
1403 | * 4th descriptor (WB_STRIDE aka 0x3) in a 64B cacheline. | |
1404 | */ | |
1405 | #define WB_STRIDE 0x3 | |
1406 | if (((i & WB_STRIDE) != WB_STRIDE) && | |
1407 | (first <= &tx_ring->tx_bi[i]) && | |
1408 | (first >= &tx_ring->tx_bi[i & ~WB_STRIDE])) { | |
1409 | tx_desc->cmd_type_offset_bsz = | |
1410 | build_ctob(td_cmd, td_offset, size, td_tag) | | |
1411 | cpu_to_le64((u64)I40E_TX_DESC_CMD_EOP << | |
1412 | I40E_TXD_QW1_CMD_SHIFT); | |
1413 | } else { | |
1414 | tx_desc->cmd_type_offset_bsz = | |
1415 | build_ctob(td_cmd, td_offset, size, td_tag) | | |
1416 | cpu_to_le64((u64)I40E_TXD_CMD << | |
1417 | I40E_TXD_QW1_CMD_SHIFT); | |
1418 | } | |
7f12ad74 GR |
1419 | |
1420 | netdev_tx_sent_queue(netdev_get_tx_queue(tx_ring->netdev, | |
1421 | tx_ring->queue_index), | |
1422 | first->bytecount); | |
1423 | ||
1424 | /* set the timestamp */ | |
1425 | first->time_stamp = jiffies; | |
1426 | ||
1427 | /* Force memory writes to complete before letting h/w | |
1428 | * know there are new descriptors to fetch. (Only | |
1429 | * applicable for weak-ordered memory model archs, | |
1430 | * such as IA-64). | |
1431 | */ | |
1432 | wmb(); | |
1433 | ||
1434 | /* set next_to_watch value indicating a packet is present */ | |
1435 | first->next_to_watch = tx_desc; | |
1436 | ||
1437 | i++; | |
1438 | if (i == tx_ring->count) | |
1439 | i = 0; | |
1440 | ||
1441 | tx_ring->next_to_use = i; | |
1442 | ||
1443 | /* notify HW of packet */ | |
1444 | writel(i, tx_ring->tail); | |
1445 | ||
1446 | return; | |
1447 | ||
1448 | dma_error: | |
1449 | dev_info(tx_ring->dev, "TX DMA map failed\n"); | |
1450 | ||
1451 | /* clear dma mappings for failed tx_bi map */ | |
1452 | for (;;) { | |
1453 | tx_bi = &tx_ring->tx_bi[i]; | |
1454 | i40e_unmap_and_free_tx_resource(tx_ring, tx_bi); | |
1455 | if (tx_bi == first) | |
1456 | break; | |
1457 | if (i == 0) | |
1458 | i = tx_ring->count; | |
1459 | i--; | |
1460 | } | |
1461 | ||
1462 | tx_ring->next_to_use = i; | |
1463 | } | |
1464 | ||
1465 | /** | |
1466 | * __i40e_maybe_stop_tx - 2nd level check for tx stop conditions | |
1467 | * @tx_ring: the ring to be checked | |
1468 | * @size: the size buffer we want to assure is available | |
1469 | * | |
1470 | * Returns -EBUSY if a stop is needed, else 0 | |
1471 | **/ | |
1472 | static inline int __i40e_maybe_stop_tx(struct i40e_ring *tx_ring, int size) | |
1473 | { | |
1474 | netif_stop_subqueue(tx_ring->netdev, tx_ring->queue_index); | |
1475 | /* Memory barrier before checking head and tail */ | |
1476 | smp_mb(); | |
1477 | ||
1478 | /* Check again in a case another CPU has just made room available. */ | |
1479 | if (likely(I40E_DESC_UNUSED(tx_ring) < size)) | |
1480 | return -EBUSY; | |
1481 | ||
1482 | /* A reprieve! - use start_queue because it doesn't call schedule */ | |
1483 | netif_start_subqueue(tx_ring->netdev, tx_ring->queue_index); | |
1484 | ++tx_ring->tx_stats.restart_queue; | |
1485 | return 0; | |
1486 | } | |
1487 | ||
1488 | /** | |
1489 | * i40e_maybe_stop_tx - 1st level check for tx stop conditions | |
1490 | * @tx_ring: the ring to be checked | |
1491 | * @size: the size buffer we want to assure is available | |
1492 | * | |
1493 | * Returns 0 if stop is not needed | |
1494 | **/ | |
1495 | static int i40e_maybe_stop_tx(struct i40e_ring *tx_ring, int size) | |
1496 | { | |
1497 | if (likely(I40E_DESC_UNUSED(tx_ring) >= size)) | |
1498 | return 0; | |
1499 | return __i40e_maybe_stop_tx(tx_ring, size); | |
1500 | } | |
1501 | ||
1502 | /** | |
1503 | * i40e_xmit_descriptor_count - calculate number of tx descriptors needed | |
1504 | * @skb: send buffer | |
1505 | * @tx_ring: ring to send buffer on | |
1506 | * | |
1507 | * Returns number of data descriptors needed for this skb. Returns 0 to indicate | |
1508 | * there is not enough descriptors available in this ring since we need at least | |
1509 | * one descriptor. | |
1510 | **/ | |
1511 | static int i40e_xmit_descriptor_count(struct sk_buff *skb, | |
1512 | struct i40e_ring *tx_ring) | |
1513 | { | |
7f12ad74 | 1514 | unsigned int f; |
7f12ad74 GR |
1515 | int count = 0; |
1516 | ||
1517 | /* need: 1 descriptor per page * PAGE_SIZE/I40E_MAX_DATA_PER_TXD, | |
1518 | * + 1 desc for skb_head_len/I40E_MAX_DATA_PER_TXD, | |
be560521 | 1519 | * + 4 desc gap to avoid the cache line where head is, |
7f12ad74 GR |
1520 | * + 1 desc for context descriptor, |
1521 | * otherwise try next time | |
1522 | */ | |
7f12ad74 GR |
1523 | for (f = 0; f < skb_shinfo(skb)->nr_frags; f++) |
1524 | count += TXD_USE_COUNT(skb_shinfo(skb)->frags[f].size); | |
980093eb | 1525 | |
7f12ad74 | 1526 | count += TXD_USE_COUNT(skb_headlen(skb)); |
be560521 | 1527 | if (i40e_maybe_stop_tx(tx_ring, count + 4 + 1)) { |
7f12ad74 GR |
1528 | tx_ring->tx_stats.tx_busy++; |
1529 | return 0; | |
1530 | } | |
1531 | return count; | |
1532 | } | |
1533 | ||
1534 | /** | |
1535 | * i40e_xmit_frame_ring - Sends buffer on Tx ring | |
1536 | * @skb: send buffer | |
1537 | * @tx_ring: ring to send buffer on | |
1538 | * | |
1539 | * Returns NETDEV_TX_OK if sent, else an error code | |
1540 | **/ | |
1541 | static netdev_tx_t i40e_xmit_frame_ring(struct sk_buff *skb, | |
1542 | struct i40e_ring *tx_ring) | |
1543 | { | |
1544 | u64 cd_type_cmd_tso_mss = I40E_TX_DESC_DTYPE_CONTEXT; | |
1545 | u32 cd_tunneling = 0, cd_l2tag2 = 0; | |
1546 | struct i40e_tx_buffer *first; | |
1547 | u32 td_offset = 0; | |
1548 | u32 tx_flags = 0; | |
1549 | __be16 protocol; | |
1550 | u32 td_cmd = 0; | |
1551 | u8 hdr_len = 0; | |
1552 | int tso; | |
1553 | if (0 == i40e_xmit_descriptor_count(skb, tx_ring)) | |
1554 | return NETDEV_TX_BUSY; | |
1555 | ||
1556 | /* prepare the xmit flags */ | |
1557 | if (i40e_tx_prepare_vlan_flags(skb, tx_ring, &tx_flags)) | |
1558 | goto out_drop; | |
1559 | ||
1560 | /* obtain protocol of skb */ | |
1561 | protocol = skb->protocol; | |
1562 | ||
1563 | /* record the location of the first descriptor for this packet */ | |
1564 | first = &tx_ring->tx_bi[tx_ring->next_to_use]; | |
1565 | ||
1566 | /* setup IPv4/IPv6 offloads */ | |
1567 | if (protocol == htons(ETH_P_IP)) | |
1568 | tx_flags |= I40E_TX_FLAGS_IPV4; | |
1569 | else if (protocol == htons(ETH_P_IPV6)) | |
1570 | tx_flags |= I40E_TX_FLAGS_IPV6; | |
1571 | ||
1572 | tso = i40e_tso(tx_ring, skb, tx_flags, protocol, &hdr_len, | |
1573 | &cd_type_cmd_tso_mss, &cd_tunneling); | |
1574 | ||
1575 | if (tso < 0) | |
1576 | goto out_drop; | |
1577 | else if (tso) | |
1578 | tx_flags |= I40E_TX_FLAGS_TSO; | |
1579 | ||
1580 | skb_tx_timestamp(skb); | |
1581 | ||
1582 | /* always enable CRC insertion offload */ | |
1583 | td_cmd |= I40E_TX_DESC_CMD_ICRC; | |
1584 | ||
1585 | /* Always offload the checksum, since it's in the data descriptor */ | |
1586 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
1587 | tx_flags |= I40E_TX_FLAGS_CSUM; | |
1588 | ||
1589 | i40e_tx_enable_csum(skb, tx_flags, &td_cmd, &td_offset, | |
1590 | tx_ring, &cd_tunneling); | |
1591 | } | |
1592 | ||
1593 | i40e_create_tx_ctx(tx_ring, cd_type_cmd_tso_mss, | |
1594 | cd_tunneling, cd_l2tag2); | |
1595 | ||
1596 | i40e_tx_map(tx_ring, skb, first, tx_flags, hdr_len, | |
1597 | td_cmd, td_offset); | |
1598 | ||
1599 | i40e_maybe_stop_tx(tx_ring, DESC_NEEDED); | |
1600 | ||
1601 | return NETDEV_TX_OK; | |
1602 | ||
1603 | out_drop: | |
1604 | dev_kfree_skb_any(skb); | |
1605 | return NETDEV_TX_OK; | |
1606 | } | |
1607 | ||
1608 | /** | |
1609 | * i40evf_xmit_frame - Selects the correct VSI and Tx queue to send buffer | |
1610 | * @skb: send buffer | |
1611 | * @netdev: network interface device structure | |
1612 | * | |
1613 | * Returns NETDEV_TX_OK if sent, else an error code | |
1614 | **/ | |
1615 | netdev_tx_t i40evf_xmit_frame(struct sk_buff *skb, struct net_device *netdev) | |
1616 | { | |
1617 | struct i40evf_adapter *adapter = netdev_priv(netdev); | |
1618 | struct i40e_ring *tx_ring = adapter->tx_rings[skb->queue_mapping]; | |
1619 | ||
1620 | /* hardware can't handle really short frames, hardware padding works | |
1621 | * beyond this point | |
1622 | */ | |
1623 | if (unlikely(skb->len < I40E_MIN_TX_LEN)) { | |
1624 | if (skb_pad(skb, I40E_MIN_TX_LEN - skb->len)) | |
1625 | return NETDEV_TX_OK; | |
1626 | skb->len = I40E_MIN_TX_LEN; | |
1627 | skb_set_tail_pointer(skb, I40E_MIN_TX_LEN); | |
1628 | } | |
1629 | ||
1630 | return i40e_xmit_frame_ring(skb, tx_ring); | |
1631 | } |