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4d22de3e | 1 | /* |
1d68e93d | 2 | * Copyright (c) 2005-2007 Chelsio, Inc. All rights reserved. |
4d22de3e | 3 | * |
1d68e93d DLR |
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: | |
4d22de3e | 9 | * |
1d68e93d DLR |
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. | |
4d22de3e | 31 | */ |
4d22de3e DLR |
32 | #include <linux/skbuff.h> |
33 | #include <linux/netdevice.h> | |
34 | #include <linux/etherdevice.h> | |
35 | #include <linux/if_vlan.h> | |
36 | #include <linux/ip.h> | |
37 | #include <linux/tcp.h> | |
38 | #include <linux/dma-mapping.h> | |
39 | #include "common.h" | |
40 | #include "regs.h" | |
41 | #include "sge_defs.h" | |
42 | #include "t3_cpl.h" | |
43 | #include "firmware_exports.h" | |
44 | ||
45 | #define USE_GTS 0 | |
46 | ||
47 | #define SGE_RX_SM_BUF_SIZE 1536 | |
e0994eb1 | 48 | |
4d22de3e | 49 | #define SGE_RX_COPY_THRES 256 |
cf992af5 | 50 | #define SGE_RX_PULL_LEN 128 |
4d22de3e | 51 | |
e0994eb1 | 52 | /* |
cf992af5 DLR |
53 | * Page chunk size for FL0 buffers if FL0 is to be populated with page chunks. |
54 | * It must be a divisor of PAGE_SIZE. If set to 0 FL0 will use sk_buffs | |
55 | * directly. | |
e0994eb1 | 56 | */ |
cf992af5 DLR |
57 | #define FL0_PG_CHUNK_SIZE 2048 |
58 | ||
e0994eb1 | 59 | #define SGE_RX_DROP_THRES 16 |
4d22de3e DLR |
60 | |
61 | /* | |
62 | * Period of the Tx buffer reclaim timer. This timer does not need to run | |
63 | * frequently as Tx buffers are usually reclaimed by new Tx packets. | |
64 | */ | |
65 | #define TX_RECLAIM_PERIOD (HZ / 4) | |
66 | ||
67 | /* WR size in bytes */ | |
68 | #define WR_LEN (WR_FLITS * 8) | |
69 | ||
70 | /* | |
71 | * Types of Tx queues in each queue set. Order here matters, do not change. | |
72 | */ | |
73 | enum { TXQ_ETH, TXQ_OFLD, TXQ_CTRL }; | |
74 | ||
75 | /* Values for sge_txq.flags */ | |
76 | enum { | |
77 | TXQ_RUNNING = 1 << 0, /* fetch engine is running */ | |
78 | TXQ_LAST_PKT_DB = 1 << 1, /* last packet rang the doorbell */ | |
79 | }; | |
80 | ||
81 | struct tx_desc { | |
fb8e4444 | 82 | __be64 flit[TX_DESC_FLITS]; |
4d22de3e DLR |
83 | }; |
84 | ||
85 | struct rx_desc { | |
86 | __be32 addr_lo; | |
87 | __be32 len_gen; | |
88 | __be32 gen2; | |
89 | __be32 addr_hi; | |
90 | }; | |
91 | ||
92 | struct tx_sw_desc { /* SW state per Tx descriptor */ | |
93 | struct sk_buff *skb; | |
23561c94 DLR |
94 | u8 eop; /* set if last descriptor for packet */ |
95 | u8 addr_idx; /* buffer index of first SGL entry in descriptor */ | |
96 | u8 fragidx; /* first page fragment associated with descriptor */ | |
97 | s8 sflit; /* start flit of first SGL entry in descriptor */ | |
4d22de3e DLR |
98 | }; |
99 | ||
cf992af5 | 100 | struct rx_sw_desc { /* SW state per Rx descriptor */ |
e0994eb1 DLR |
101 | union { |
102 | struct sk_buff *skb; | |
cf992af5 DLR |
103 | struct fl_pg_chunk pg_chunk; |
104 | }; | |
105 | DECLARE_PCI_UNMAP_ADDR(dma_addr); | |
4d22de3e DLR |
106 | }; |
107 | ||
108 | struct rsp_desc { /* response queue descriptor */ | |
109 | struct rss_header rss_hdr; | |
110 | __be32 flags; | |
111 | __be32 len_cq; | |
112 | u8 imm_data[47]; | |
113 | u8 intr_gen; | |
114 | }; | |
115 | ||
99d7cf30 DLR |
116 | /* |
117 | * Holds unmapping information for Tx packets that need deferred unmapping. | |
118 | * This structure lives at skb->head and must be allocated by callers. | |
119 | */ | |
120 | struct deferred_unmap_info { | |
121 | struct pci_dev *pdev; | |
122 | dma_addr_t addr[MAX_SKB_FRAGS + 1]; | |
123 | }; | |
124 | ||
4d22de3e DLR |
125 | /* |
126 | * Maps a number of flits to the number of Tx descriptors that can hold them. | |
127 | * The formula is | |
128 | * | |
129 | * desc = 1 + (flits - 2) / (WR_FLITS - 1). | |
130 | * | |
131 | * HW allows up to 4 descriptors to be combined into a WR. | |
132 | */ | |
133 | static u8 flit_desc_map[] = { | |
134 | 0, | |
135 | #if SGE_NUM_GENBITS == 1 | |
136 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, | |
137 | 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, | |
138 | 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, | |
139 | 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4 | |
140 | #elif SGE_NUM_GENBITS == 2 | |
141 | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, | |
142 | 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, | |
143 | 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, | |
144 | 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, | |
145 | #else | |
146 | # error "SGE_NUM_GENBITS must be 1 or 2" | |
147 | #endif | |
148 | }; | |
149 | ||
150 | static inline struct sge_qset *fl_to_qset(const struct sge_fl *q, int qidx) | |
151 | { | |
152 | return container_of(q, struct sge_qset, fl[qidx]); | |
153 | } | |
154 | ||
155 | static inline struct sge_qset *rspq_to_qset(const struct sge_rspq *q) | |
156 | { | |
157 | return container_of(q, struct sge_qset, rspq); | |
158 | } | |
159 | ||
160 | static inline struct sge_qset *txq_to_qset(const struct sge_txq *q, int qidx) | |
161 | { | |
162 | return container_of(q, struct sge_qset, txq[qidx]); | |
163 | } | |
164 | ||
165 | /** | |
166 | * refill_rspq - replenish an SGE response queue | |
167 | * @adapter: the adapter | |
168 | * @q: the response queue to replenish | |
169 | * @credits: how many new responses to make available | |
170 | * | |
171 | * Replenishes a response queue by making the supplied number of responses | |
172 | * available to HW. | |
173 | */ | |
174 | static inline void refill_rspq(struct adapter *adapter, | |
175 | const struct sge_rspq *q, unsigned int credits) | |
176 | { | |
afefce66 | 177 | rmb(); |
4d22de3e DLR |
178 | t3_write_reg(adapter, A_SG_RSPQ_CREDIT_RETURN, |
179 | V_RSPQ(q->cntxt_id) | V_CREDITS(credits)); | |
180 | } | |
181 | ||
182 | /** | |
183 | * need_skb_unmap - does the platform need unmapping of sk_buffs? | |
184 | * | |
185 | * Returns true if the platfrom needs sk_buff unmapping. The compiler | |
186 | * optimizes away unecessary code if this returns true. | |
187 | */ | |
188 | static inline int need_skb_unmap(void) | |
189 | { | |
190 | /* | |
191 | * This structure is used to tell if the platfrom needs buffer | |
192 | * unmapping by checking if DECLARE_PCI_UNMAP_ADDR defines anything. | |
193 | */ | |
194 | struct dummy { | |
195 | DECLARE_PCI_UNMAP_ADDR(addr); | |
196 | }; | |
197 | ||
198 | return sizeof(struct dummy) != 0; | |
199 | } | |
200 | ||
201 | /** | |
202 | * unmap_skb - unmap a packet main body and its page fragments | |
203 | * @skb: the packet | |
204 | * @q: the Tx queue containing Tx descriptors for the packet | |
205 | * @cidx: index of Tx descriptor | |
206 | * @pdev: the PCI device | |
207 | * | |
208 | * Unmap the main body of an sk_buff and its page fragments, if any. | |
209 | * Because of the fairly complicated structure of our SGLs and the desire | |
23561c94 DLR |
210 | * to conserve space for metadata, the information necessary to unmap an |
211 | * sk_buff is spread across the sk_buff itself (buffer lengths), the HW Tx | |
212 | * descriptors (the physical addresses of the various data buffers), and | |
213 | * the SW descriptor state (assorted indices). The send functions | |
214 | * initialize the indices for the first packet descriptor so we can unmap | |
215 | * the buffers held in the first Tx descriptor here, and we have enough | |
216 | * information at this point to set the state for the next Tx descriptor. | |
217 | * | |
218 | * Note that it is possible to clean up the first descriptor of a packet | |
219 | * before the send routines have written the next descriptors, but this | |
220 | * race does not cause any problem. We just end up writing the unmapping | |
221 | * info for the descriptor first. | |
4d22de3e DLR |
222 | */ |
223 | static inline void unmap_skb(struct sk_buff *skb, struct sge_txq *q, | |
224 | unsigned int cidx, struct pci_dev *pdev) | |
225 | { | |
226 | const struct sg_ent *sgp; | |
23561c94 DLR |
227 | struct tx_sw_desc *d = &q->sdesc[cidx]; |
228 | int nfrags, frag_idx, curflit, j = d->addr_idx; | |
4d22de3e | 229 | |
23561c94 DLR |
230 | sgp = (struct sg_ent *)&q->desc[cidx].flit[d->sflit]; |
231 | frag_idx = d->fragidx; | |
4d22de3e | 232 | |
23561c94 DLR |
233 | if (frag_idx == 0 && skb_headlen(skb)) { |
234 | pci_unmap_single(pdev, be64_to_cpu(sgp->addr[0]), | |
235 | skb_headlen(skb), PCI_DMA_TODEVICE); | |
4d22de3e DLR |
236 | j = 1; |
237 | } | |
238 | ||
23561c94 | 239 | curflit = d->sflit + 1 + j; |
4d22de3e DLR |
240 | nfrags = skb_shinfo(skb)->nr_frags; |
241 | ||
242 | while (frag_idx < nfrags && curflit < WR_FLITS) { | |
243 | pci_unmap_page(pdev, be64_to_cpu(sgp->addr[j]), | |
244 | skb_shinfo(skb)->frags[frag_idx].size, | |
245 | PCI_DMA_TODEVICE); | |
246 | j ^= 1; | |
247 | if (j == 0) { | |
248 | sgp++; | |
249 | curflit++; | |
250 | } | |
251 | curflit++; | |
252 | frag_idx++; | |
253 | } | |
254 | ||
23561c94 DLR |
255 | if (frag_idx < nfrags) { /* SGL continues into next Tx descriptor */ |
256 | d = cidx + 1 == q->size ? q->sdesc : d + 1; | |
257 | d->fragidx = frag_idx; | |
258 | d->addr_idx = j; | |
259 | d->sflit = curflit - WR_FLITS - j; /* sflit can be -1 */ | |
4d22de3e DLR |
260 | } |
261 | } | |
262 | ||
263 | /** | |
264 | * free_tx_desc - reclaims Tx descriptors and their buffers | |
265 | * @adapter: the adapter | |
266 | * @q: the Tx queue to reclaim descriptors from | |
267 | * @n: the number of descriptors to reclaim | |
268 | * | |
269 | * Reclaims Tx descriptors from an SGE Tx queue and frees the associated | |
270 | * Tx buffers. Called with the Tx queue lock held. | |
271 | */ | |
272 | static void free_tx_desc(struct adapter *adapter, struct sge_txq *q, | |
273 | unsigned int n) | |
274 | { | |
275 | struct tx_sw_desc *d; | |
276 | struct pci_dev *pdev = adapter->pdev; | |
277 | unsigned int cidx = q->cidx; | |
278 | ||
99d7cf30 DLR |
279 | const int need_unmap = need_skb_unmap() && |
280 | q->cntxt_id >= FW_TUNNEL_SGEEC_START; | |
281 | ||
4d22de3e DLR |
282 | d = &q->sdesc[cidx]; |
283 | while (n--) { | |
284 | if (d->skb) { /* an SGL is present */ | |
99d7cf30 | 285 | if (need_unmap) |
4d22de3e | 286 | unmap_skb(d->skb, q, cidx, pdev); |
23561c94 | 287 | if (d->eop) |
4d22de3e DLR |
288 | kfree_skb(d->skb); |
289 | } | |
290 | ++d; | |
291 | if (++cidx == q->size) { | |
292 | cidx = 0; | |
293 | d = q->sdesc; | |
294 | } | |
295 | } | |
296 | q->cidx = cidx; | |
297 | } | |
298 | ||
299 | /** | |
300 | * reclaim_completed_tx - reclaims completed Tx descriptors | |
301 | * @adapter: the adapter | |
302 | * @q: the Tx queue to reclaim completed descriptors from | |
303 | * | |
304 | * Reclaims Tx descriptors that the SGE has indicated it has processed, | |
305 | * and frees the associated buffers if possible. Called with the Tx | |
306 | * queue's lock held. | |
307 | */ | |
308 | static inline void reclaim_completed_tx(struct adapter *adapter, | |
309 | struct sge_txq *q) | |
310 | { | |
311 | unsigned int reclaim = q->processed - q->cleaned; | |
312 | ||
313 | if (reclaim) { | |
314 | free_tx_desc(adapter, q, reclaim); | |
315 | q->cleaned += reclaim; | |
316 | q->in_use -= reclaim; | |
317 | } | |
318 | } | |
319 | ||
320 | /** | |
321 | * should_restart_tx - are there enough resources to restart a Tx queue? | |
322 | * @q: the Tx queue | |
323 | * | |
324 | * Checks if there are enough descriptors to restart a suspended Tx queue. | |
325 | */ | |
326 | static inline int should_restart_tx(const struct sge_txq *q) | |
327 | { | |
328 | unsigned int r = q->processed - q->cleaned; | |
329 | ||
330 | return q->in_use - r < (q->size >> 1); | |
331 | } | |
332 | ||
333 | /** | |
334 | * free_rx_bufs - free the Rx buffers on an SGE free list | |
335 | * @pdev: the PCI device associated with the adapter | |
336 | * @rxq: the SGE free list to clean up | |
337 | * | |
338 | * Release the buffers on an SGE free-buffer Rx queue. HW fetching from | |
339 | * this queue should be stopped before calling this function. | |
340 | */ | |
341 | static void free_rx_bufs(struct pci_dev *pdev, struct sge_fl *q) | |
342 | { | |
343 | unsigned int cidx = q->cidx; | |
344 | ||
345 | while (q->credits--) { | |
346 | struct rx_sw_desc *d = &q->sdesc[cidx]; | |
347 | ||
348 | pci_unmap_single(pdev, pci_unmap_addr(d, dma_addr), | |
349 | q->buf_size, PCI_DMA_FROMDEVICE); | |
cf992af5 DLR |
350 | if (q->use_pages) { |
351 | put_page(d->pg_chunk.page); | |
352 | d->pg_chunk.page = NULL; | |
e0994eb1 | 353 | } else { |
cf992af5 DLR |
354 | kfree_skb(d->skb); |
355 | d->skb = NULL; | |
e0994eb1 | 356 | } |
4d22de3e DLR |
357 | if (++cidx == q->size) |
358 | cidx = 0; | |
359 | } | |
e0994eb1 | 360 | |
cf992af5 DLR |
361 | if (q->pg_chunk.page) { |
362 | __free_page(q->pg_chunk.page); | |
363 | q->pg_chunk.page = NULL; | |
364 | } | |
4d22de3e DLR |
365 | } |
366 | ||
367 | /** | |
368 | * add_one_rx_buf - add a packet buffer to a free-buffer list | |
cf992af5 | 369 | * @va: buffer start VA |
4d22de3e DLR |
370 | * @len: the buffer length |
371 | * @d: the HW Rx descriptor to write | |
372 | * @sd: the SW Rx descriptor to write | |
373 | * @gen: the generation bit value | |
374 | * @pdev: the PCI device associated with the adapter | |
375 | * | |
376 | * Add a buffer of the given length to the supplied HW and SW Rx | |
377 | * descriptors. | |
378 | */ | |
cf992af5 | 379 | static inline void add_one_rx_buf(void *va, unsigned int len, |
4d22de3e DLR |
380 | struct rx_desc *d, struct rx_sw_desc *sd, |
381 | unsigned int gen, struct pci_dev *pdev) | |
382 | { | |
383 | dma_addr_t mapping; | |
384 | ||
e0994eb1 | 385 | mapping = pci_map_single(pdev, va, len, PCI_DMA_FROMDEVICE); |
4d22de3e DLR |
386 | pci_unmap_addr_set(sd, dma_addr, mapping); |
387 | ||
388 | d->addr_lo = cpu_to_be32(mapping); | |
389 | d->addr_hi = cpu_to_be32((u64) mapping >> 32); | |
390 | wmb(); | |
391 | d->len_gen = cpu_to_be32(V_FLD_GEN1(gen)); | |
392 | d->gen2 = cpu_to_be32(V_FLD_GEN2(gen)); | |
393 | } | |
394 | ||
cf992af5 DLR |
395 | static int alloc_pg_chunk(struct sge_fl *q, struct rx_sw_desc *sd, gfp_t gfp) |
396 | { | |
397 | if (!q->pg_chunk.page) { | |
398 | q->pg_chunk.page = alloc_page(gfp); | |
399 | if (unlikely(!q->pg_chunk.page)) | |
400 | return -ENOMEM; | |
401 | q->pg_chunk.va = page_address(q->pg_chunk.page); | |
402 | q->pg_chunk.offset = 0; | |
403 | } | |
404 | sd->pg_chunk = q->pg_chunk; | |
405 | ||
406 | q->pg_chunk.offset += q->buf_size; | |
407 | if (q->pg_chunk.offset == PAGE_SIZE) | |
408 | q->pg_chunk.page = NULL; | |
409 | else { | |
410 | q->pg_chunk.va += q->buf_size; | |
411 | get_page(q->pg_chunk.page); | |
412 | } | |
413 | return 0; | |
414 | } | |
415 | ||
4d22de3e DLR |
416 | /** |
417 | * refill_fl - refill an SGE free-buffer list | |
418 | * @adapter: the adapter | |
419 | * @q: the free-list to refill | |
420 | * @n: the number of new buffers to allocate | |
421 | * @gfp: the gfp flags for allocating new buffers | |
422 | * | |
423 | * (Re)populate an SGE free-buffer list with up to @n new packet buffers, | |
424 | * allocated with the supplied gfp flags. The caller must assure that | |
425 | * @n does not exceed the queue's capacity. | |
426 | */ | |
427 | static void refill_fl(struct adapter *adap, struct sge_fl *q, int n, gfp_t gfp) | |
428 | { | |
cf992af5 | 429 | void *buf_start; |
4d22de3e DLR |
430 | struct rx_sw_desc *sd = &q->sdesc[q->pidx]; |
431 | struct rx_desc *d = &q->desc[q->pidx]; | |
432 | ||
433 | while (n--) { | |
cf992af5 DLR |
434 | if (q->use_pages) { |
435 | if (unlikely(alloc_pg_chunk(q, sd, gfp))) { | |
436 | nomem: q->alloc_failed++; | |
e0994eb1 DLR |
437 | break; |
438 | } | |
cf992af5 | 439 | buf_start = sd->pg_chunk.va; |
e0994eb1 | 440 | } else { |
cf992af5 | 441 | struct sk_buff *skb = alloc_skb(q->buf_size, gfp); |
e0994eb1 | 442 | |
cf992af5 DLR |
443 | if (!skb) |
444 | goto nomem; | |
e0994eb1 | 445 | |
cf992af5 DLR |
446 | sd->skb = skb; |
447 | buf_start = skb->data; | |
e0994eb1 DLR |
448 | } |
449 | ||
cf992af5 DLR |
450 | add_one_rx_buf(buf_start, q->buf_size, d, sd, q->gen, |
451 | adap->pdev); | |
4d22de3e DLR |
452 | d++; |
453 | sd++; | |
454 | if (++q->pidx == q->size) { | |
455 | q->pidx = 0; | |
456 | q->gen ^= 1; | |
457 | sd = q->sdesc; | |
458 | d = q->desc; | |
459 | } | |
460 | q->credits++; | |
461 | } | |
afefce66 | 462 | wmb(); |
4d22de3e DLR |
463 | t3_write_reg(adap, A_SG_KDOORBELL, V_EGRCNTX(q->cntxt_id)); |
464 | } | |
465 | ||
466 | static inline void __refill_fl(struct adapter *adap, struct sge_fl *fl) | |
467 | { | |
468 | refill_fl(adap, fl, min(16U, fl->size - fl->credits), GFP_ATOMIC); | |
469 | } | |
470 | ||
471 | /** | |
472 | * recycle_rx_buf - recycle a receive buffer | |
473 | * @adapter: the adapter | |
474 | * @q: the SGE free list | |
475 | * @idx: index of buffer to recycle | |
476 | * | |
477 | * Recycles the specified buffer on the given free list by adding it at | |
478 | * the next available slot on the list. | |
479 | */ | |
480 | static void recycle_rx_buf(struct adapter *adap, struct sge_fl *q, | |
481 | unsigned int idx) | |
482 | { | |
483 | struct rx_desc *from = &q->desc[idx]; | |
484 | struct rx_desc *to = &q->desc[q->pidx]; | |
485 | ||
cf992af5 | 486 | q->sdesc[q->pidx] = q->sdesc[idx]; |
4d22de3e DLR |
487 | to->addr_lo = from->addr_lo; /* already big endian */ |
488 | to->addr_hi = from->addr_hi; /* likewise */ | |
489 | wmb(); | |
490 | to->len_gen = cpu_to_be32(V_FLD_GEN1(q->gen)); | |
491 | to->gen2 = cpu_to_be32(V_FLD_GEN2(q->gen)); | |
492 | q->credits++; | |
493 | ||
494 | if (++q->pidx == q->size) { | |
495 | q->pidx = 0; | |
496 | q->gen ^= 1; | |
497 | } | |
498 | t3_write_reg(adap, A_SG_KDOORBELL, V_EGRCNTX(q->cntxt_id)); | |
499 | } | |
500 | ||
501 | /** | |
502 | * alloc_ring - allocate resources for an SGE descriptor ring | |
503 | * @pdev: the PCI device | |
504 | * @nelem: the number of descriptors | |
505 | * @elem_size: the size of each descriptor | |
506 | * @sw_size: the size of the SW state associated with each ring element | |
507 | * @phys: the physical address of the allocated ring | |
508 | * @metadata: address of the array holding the SW state for the ring | |
509 | * | |
510 | * Allocates resources for an SGE descriptor ring, such as Tx queues, | |
511 | * free buffer lists, or response queues. Each SGE ring requires | |
512 | * space for its HW descriptors plus, optionally, space for the SW state | |
513 | * associated with each HW entry (the metadata). The function returns | |
514 | * three values: the virtual address for the HW ring (the return value | |
515 | * of the function), the physical address of the HW ring, and the address | |
516 | * of the SW ring. | |
517 | */ | |
518 | static void *alloc_ring(struct pci_dev *pdev, size_t nelem, size_t elem_size, | |
e0994eb1 | 519 | size_t sw_size, dma_addr_t * phys, void *metadata) |
4d22de3e DLR |
520 | { |
521 | size_t len = nelem * elem_size; | |
522 | void *s = NULL; | |
523 | void *p = dma_alloc_coherent(&pdev->dev, len, phys, GFP_KERNEL); | |
524 | ||
525 | if (!p) | |
526 | return NULL; | |
527 | if (sw_size) { | |
528 | s = kcalloc(nelem, sw_size, GFP_KERNEL); | |
529 | ||
530 | if (!s) { | |
531 | dma_free_coherent(&pdev->dev, len, p, *phys); | |
532 | return NULL; | |
533 | } | |
534 | } | |
535 | if (metadata) | |
536 | *(void **)metadata = s; | |
537 | memset(p, 0, len); | |
538 | return p; | |
539 | } | |
540 | ||
204e2f98 DLR |
541 | /** |
542 | * t3_reset_qset - reset a sge qset | |
543 | * @q: the queue set | |
544 | * | |
545 | * Reset the qset structure. | |
546 | * the NAPI structure is preserved in the event of | |
547 | * the qset's reincarnation, for example during EEH recovery. | |
548 | */ | |
549 | static void t3_reset_qset(struct sge_qset *q) | |
550 | { | |
551 | if (q->adap && | |
552 | !(q->adap->flags & NAPI_INIT)) { | |
553 | memset(q, 0, sizeof(*q)); | |
554 | return; | |
555 | } | |
556 | ||
557 | q->adap = NULL; | |
558 | memset(&q->rspq, 0, sizeof(q->rspq)); | |
559 | memset(q->fl, 0, sizeof(struct sge_fl) * SGE_RXQ_PER_SET); | |
560 | memset(q->txq, 0, sizeof(struct sge_txq) * SGE_TXQ_PER_SET); | |
561 | q->txq_stopped = 0; | |
562 | memset(&q->tx_reclaim_timer, 0, sizeof(q->tx_reclaim_timer)); | |
563 | } | |
564 | ||
565 | ||
4d22de3e DLR |
566 | /** |
567 | * free_qset - free the resources of an SGE queue set | |
568 | * @adapter: the adapter owning the queue set | |
569 | * @q: the queue set | |
570 | * | |
571 | * Release the HW and SW resources associated with an SGE queue set, such | |
572 | * as HW contexts, packet buffers, and descriptor rings. Traffic to the | |
573 | * queue set must be quiesced prior to calling this. | |
574 | */ | |
9265fabf | 575 | static void t3_free_qset(struct adapter *adapter, struct sge_qset *q) |
4d22de3e DLR |
576 | { |
577 | int i; | |
578 | struct pci_dev *pdev = adapter->pdev; | |
579 | ||
580 | if (q->tx_reclaim_timer.function) | |
581 | del_timer_sync(&q->tx_reclaim_timer); | |
582 | ||
583 | for (i = 0; i < SGE_RXQ_PER_SET; ++i) | |
584 | if (q->fl[i].desc) { | |
b1186dee | 585 | spin_lock_irq(&adapter->sge.reg_lock); |
4d22de3e | 586 | t3_sge_disable_fl(adapter, q->fl[i].cntxt_id); |
b1186dee | 587 | spin_unlock_irq(&adapter->sge.reg_lock); |
4d22de3e DLR |
588 | free_rx_bufs(pdev, &q->fl[i]); |
589 | kfree(q->fl[i].sdesc); | |
590 | dma_free_coherent(&pdev->dev, | |
591 | q->fl[i].size * | |
592 | sizeof(struct rx_desc), q->fl[i].desc, | |
593 | q->fl[i].phys_addr); | |
594 | } | |
595 | ||
596 | for (i = 0; i < SGE_TXQ_PER_SET; ++i) | |
597 | if (q->txq[i].desc) { | |
b1186dee | 598 | spin_lock_irq(&adapter->sge.reg_lock); |
4d22de3e | 599 | t3_sge_enable_ecntxt(adapter, q->txq[i].cntxt_id, 0); |
b1186dee | 600 | spin_unlock_irq(&adapter->sge.reg_lock); |
4d22de3e DLR |
601 | if (q->txq[i].sdesc) { |
602 | free_tx_desc(adapter, &q->txq[i], | |
603 | q->txq[i].in_use); | |
604 | kfree(q->txq[i].sdesc); | |
605 | } | |
606 | dma_free_coherent(&pdev->dev, | |
607 | q->txq[i].size * | |
608 | sizeof(struct tx_desc), | |
609 | q->txq[i].desc, q->txq[i].phys_addr); | |
610 | __skb_queue_purge(&q->txq[i].sendq); | |
611 | } | |
612 | ||
613 | if (q->rspq.desc) { | |
b1186dee | 614 | spin_lock_irq(&adapter->sge.reg_lock); |
4d22de3e | 615 | t3_sge_disable_rspcntxt(adapter, q->rspq.cntxt_id); |
b1186dee | 616 | spin_unlock_irq(&adapter->sge.reg_lock); |
4d22de3e DLR |
617 | dma_free_coherent(&pdev->dev, |
618 | q->rspq.size * sizeof(struct rsp_desc), | |
619 | q->rspq.desc, q->rspq.phys_addr); | |
620 | } | |
621 | ||
204e2f98 | 622 | t3_reset_qset(q); |
4d22de3e DLR |
623 | } |
624 | ||
625 | /** | |
626 | * init_qset_cntxt - initialize an SGE queue set context info | |
627 | * @qs: the queue set | |
628 | * @id: the queue set id | |
629 | * | |
630 | * Initializes the TIDs and context ids for the queues of a queue set. | |
631 | */ | |
632 | static void init_qset_cntxt(struct sge_qset *qs, unsigned int id) | |
633 | { | |
634 | qs->rspq.cntxt_id = id; | |
635 | qs->fl[0].cntxt_id = 2 * id; | |
636 | qs->fl[1].cntxt_id = 2 * id + 1; | |
637 | qs->txq[TXQ_ETH].cntxt_id = FW_TUNNEL_SGEEC_START + id; | |
638 | qs->txq[TXQ_ETH].token = FW_TUNNEL_TID_START + id; | |
639 | qs->txq[TXQ_OFLD].cntxt_id = FW_OFLD_SGEEC_START + id; | |
640 | qs->txq[TXQ_CTRL].cntxt_id = FW_CTRL_SGEEC_START + id; | |
641 | qs->txq[TXQ_CTRL].token = FW_CTRL_TID_START + id; | |
642 | } | |
643 | ||
644 | /** | |
645 | * sgl_len - calculates the size of an SGL of the given capacity | |
646 | * @n: the number of SGL entries | |
647 | * | |
648 | * Calculates the number of flits needed for a scatter/gather list that | |
649 | * can hold the given number of entries. | |
650 | */ | |
651 | static inline unsigned int sgl_len(unsigned int n) | |
652 | { | |
653 | /* alternatively: 3 * (n / 2) + 2 * (n & 1) */ | |
654 | return (3 * n) / 2 + (n & 1); | |
655 | } | |
656 | ||
657 | /** | |
658 | * flits_to_desc - returns the num of Tx descriptors for the given flits | |
659 | * @n: the number of flits | |
660 | * | |
661 | * Calculates the number of Tx descriptors needed for the supplied number | |
662 | * of flits. | |
663 | */ | |
664 | static inline unsigned int flits_to_desc(unsigned int n) | |
665 | { | |
666 | BUG_ON(n >= ARRAY_SIZE(flit_desc_map)); | |
667 | return flit_desc_map[n]; | |
668 | } | |
669 | ||
cf992af5 DLR |
670 | /** |
671 | * get_packet - return the next ingress packet buffer from a free list | |
672 | * @adap: the adapter that received the packet | |
673 | * @fl: the SGE free list holding the packet | |
674 | * @len: the packet length including any SGE padding | |
675 | * @drop_thres: # of remaining buffers before we start dropping packets | |
676 | * | |
677 | * Get the next packet from a free list and complete setup of the | |
678 | * sk_buff. If the packet is small we make a copy and recycle the | |
679 | * original buffer, otherwise we use the original buffer itself. If a | |
680 | * positive drop threshold is supplied packets are dropped and their | |
681 | * buffers recycled if (a) the number of remaining buffers is under the | |
682 | * threshold and the packet is too big to copy, or (b) the packet should | |
683 | * be copied but there is no memory for the copy. | |
684 | */ | |
685 | static struct sk_buff *get_packet(struct adapter *adap, struct sge_fl *fl, | |
686 | unsigned int len, unsigned int drop_thres) | |
687 | { | |
688 | struct sk_buff *skb = NULL; | |
689 | struct rx_sw_desc *sd = &fl->sdesc[fl->cidx]; | |
690 | ||
691 | prefetch(sd->skb->data); | |
692 | fl->credits--; | |
693 | ||
694 | if (len <= SGE_RX_COPY_THRES) { | |
695 | skb = alloc_skb(len, GFP_ATOMIC); | |
696 | if (likely(skb != NULL)) { | |
697 | __skb_put(skb, len); | |
698 | pci_dma_sync_single_for_cpu(adap->pdev, | |
699 | pci_unmap_addr(sd, dma_addr), len, | |
700 | PCI_DMA_FROMDEVICE); | |
701 | memcpy(skb->data, sd->skb->data, len); | |
702 | pci_dma_sync_single_for_device(adap->pdev, | |
703 | pci_unmap_addr(sd, dma_addr), len, | |
704 | PCI_DMA_FROMDEVICE); | |
705 | } else if (!drop_thres) | |
706 | goto use_orig_buf; | |
707 | recycle: | |
708 | recycle_rx_buf(adap, fl, fl->cidx); | |
709 | return skb; | |
710 | } | |
711 | ||
712 | if (unlikely(fl->credits < drop_thres)) | |
713 | goto recycle; | |
714 | ||
715 | use_orig_buf: | |
716 | pci_unmap_single(adap->pdev, pci_unmap_addr(sd, dma_addr), | |
717 | fl->buf_size, PCI_DMA_FROMDEVICE); | |
718 | skb = sd->skb; | |
719 | skb_put(skb, len); | |
720 | __refill_fl(adap, fl); | |
721 | return skb; | |
722 | } | |
723 | ||
724 | /** | |
725 | * get_packet_pg - return the next ingress packet buffer from a free list | |
726 | * @adap: the adapter that received the packet | |
727 | * @fl: the SGE free list holding the packet | |
728 | * @len: the packet length including any SGE padding | |
729 | * @drop_thres: # of remaining buffers before we start dropping packets | |
730 | * | |
731 | * Get the next packet from a free list populated with page chunks. | |
732 | * If the packet is small we make a copy and recycle the original buffer, | |
733 | * otherwise we attach the original buffer as a page fragment to a fresh | |
734 | * sk_buff. If a positive drop threshold is supplied packets are dropped | |
735 | * and their buffers recycled if (a) the number of remaining buffers is | |
736 | * under the threshold and the packet is too big to copy, or (b) there's | |
737 | * no system memory. | |
738 | * | |
739 | * Note: this function is similar to @get_packet but deals with Rx buffers | |
740 | * that are page chunks rather than sk_buffs. | |
741 | */ | |
742 | static struct sk_buff *get_packet_pg(struct adapter *adap, struct sge_fl *fl, | |
743 | unsigned int len, unsigned int drop_thres) | |
744 | { | |
745 | struct sk_buff *skb = NULL; | |
746 | struct rx_sw_desc *sd = &fl->sdesc[fl->cidx]; | |
747 | ||
748 | if (len <= SGE_RX_COPY_THRES) { | |
749 | skb = alloc_skb(len, GFP_ATOMIC); | |
750 | if (likely(skb != NULL)) { | |
751 | __skb_put(skb, len); | |
752 | pci_dma_sync_single_for_cpu(adap->pdev, | |
753 | pci_unmap_addr(sd, dma_addr), len, | |
754 | PCI_DMA_FROMDEVICE); | |
755 | memcpy(skb->data, sd->pg_chunk.va, len); | |
756 | pci_dma_sync_single_for_device(adap->pdev, | |
757 | pci_unmap_addr(sd, dma_addr), len, | |
758 | PCI_DMA_FROMDEVICE); | |
759 | } else if (!drop_thres) | |
760 | return NULL; | |
761 | recycle: | |
762 | fl->credits--; | |
763 | recycle_rx_buf(adap, fl, fl->cidx); | |
764 | return skb; | |
765 | } | |
766 | ||
767 | if (unlikely(fl->credits <= drop_thres)) | |
768 | goto recycle; | |
769 | ||
770 | skb = alloc_skb(SGE_RX_PULL_LEN, GFP_ATOMIC); | |
771 | if (unlikely(!skb)) { | |
772 | if (!drop_thres) | |
773 | return NULL; | |
774 | goto recycle; | |
775 | } | |
776 | ||
777 | pci_unmap_single(adap->pdev, pci_unmap_addr(sd, dma_addr), | |
778 | fl->buf_size, PCI_DMA_FROMDEVICE); | |
779 | __skb_put(skb, SGE_RX_PULL_LEN); | |
780 | memcpy(skb->data, sd->pg_chunk.va, SGE_RX_PULL_LEN); | |
781 | skb_fill_page_desc(skb, 0, sd->pg_chunk.page, | |
782 | sd->pg_chunk.offset + SGE_RX_PULL_LEN, | |
783 | len - SGE_RX_PULL_LEN); | |
784 | skb->len = len; | |
785 | skb->data_len = len - SGE_RX_PULL_LEN; | |
786 | skb->truesize += skb->data_len; | |
787 | ||
788 | fl->credits--; | |
789 | /* | |
790 | * We do not refill FLs here, we let the caller do it to overlap a | |
791 | * prefetch. | |
792 | */ | |
793 | return skb; | |
794 | } | |
795 | ||
4d22de3e DLR |
796 | /** |
797 | * get_imm_packet - return the next ingress packet buffer from a response | |
798 | * @resp: the response descriptor containing the packet data | |
799 | * | |
800 | * Return a packet containing the immediate data of the given response. | |
801 | */ | |
802 | static inline struct sk_buff *get_imm_packet(const struct rsp_desc *resp) | |
803 | { | |
804 | struct sk_buff *skb = alloc_skb(IMMED_PKT_SIZE, GFP_ATOMIC); | |
805 | ||
806 | if (skb) { | |
807 | __skb_put(skb, IMMED_PKT_SIZE); | |
27d7ff46 | 808 | skb_copy_to_linear_data(skb, resp->imm_data, IMMED_PKT_SIZE); |
4d22de3e DLR |
809 | } |
810 | return skb; | |
811 | } | |
812 | ||
813 | /** | |
814 | * calc_tx_descs - calculate the number of Tx descriptors for a packet | |
815 | * @skb: the packet | |
816 | * | |
817 | * Returns the number of Tx descriptors needed for the given Ethernet | |
818 | * packet. Ethernet packets require addition of WR and CPL headers. | |
819 | */ | |
820 | static inline unsigned int calc_tx_descs(const struct sk_buff *skb) | |
821 | { | |
822 | unsigned int flits; | |
823 | ||
824 | if (skb->len <= WR_LEN - sizeof(struct cpl_tx_pkt)) | |
825 | return 1; | |
826 | ||
827 | flits = sgl_len(skb_shinfo(skb)->nr_frags + 1) + 2; | |
828 | if (skb_shinfo(skb)->gso_size) | |
829 | flits++; | |
830 | return flits_to_desc(flits); | |
831 | } | |
832 | ||
833 | /** | |
834 | * make_sgl - populate a scatter/gather list for a packet | |
835 | * @skb: the packet | |
836 | * @sgp: the SGL to populate | |
837 | * @start: start address of skb main body data to include in the SGL | |
838 | * @len: length of skb main body data to include in the SGL | |
839 | * @pdev: the PCI device | |
840 | * | |
841 | * Generates a scatter/gather list for the buffers that make up a packet | |
842 | * and returns the SGL size in 8-byte words. The caller must size the SGL | |
843 | * appropriately. | |
844 | */ | |
845 | static inline unsigned int make_sgl(const struct sk_buff *skb, | |
846 | struct sg_ent *sgp, unsigned char *start, | |
847 | unsigned int len, struct pci_dev *pdev) | |
848 | { | |
849 | dma_addr_t mapping; | |
850 | unsigned int i, j = 0, nfrags; | |
851 | ||
852 | if (len) { | |
853 | mapping = pci_map_single(pdev, start, len, PCI_DMA_TODEVICE); | |
854 | sgp->len[0] = cpu_to_be32(len); | |
855 | sgp->addr[0] = cpu_to_be64(mapping); | |
856 | j = 1; | |
857 | } | |
858 | ||
859 | nfrags = skb_shinfo(skb)->nr_frags; | |
860 | for (i = 0; i < nfrags; i++) { | |
861 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; | |
862 | ||
863 | mapping = pci_map_page(pdev, frag->page, frag->page_offset, | |
864 | frag->size, PCI_DMA_TODEVICE); | |
865 | sgp->len[j] = cpu_to_be32(frag->size); | |
866 | sgp->addr[j] = cpu_to_be64(mapping); | |
867 | j ^= 1; | |
868 | if (j == 0) | |
869 | ++sgp; | |
870 | } | |
871 | if (j) | |
872 | sgp->len[j] = 0; | |
873 | return ((nfrags + (len != 0)) * 3) / 2 + j; | |
874 | } | |
875 | ||
876 | /** | |
877 | * check_ring_tx_db - check and potentially ring a Tx queue's doorbell | |
878 | * @adap: the adapter | |
879 | * @q: the Tx queue | |
880 | * | |
881 | * Ring the doorbel if a Tx queue is asleep. There is a natural race, | |
882 | * where the HW is going to sleep just after we checked, however, | |
883 | * then the interrupt handler will detect the outstanding TX packet | |
884 | * and ring the doorbell for us. | |
885 | * | |
886 | * When GTS is disabled we unconditionally ring the doorbell. | |
887 | */ | |
888 | static inline void check_ring_tx_db(struct adapter *adap, struct sge_txq *q) | |
889 | { | |
890 | #if USE_GTS | |
891 | clear_bit(TXQ_LAST_PKT_DB, &q->flags); | |
892 | if (test_and_set_bit(TXQ_RUNNING, &q->flags) == 0) { | |
893 | set_bit(TXQ_LAST_PKT_DB, &q->flags); | |
894 | t3_write_reg(adap, A_SG_KDOORBELL, | |
895 | F_SELEGRCNTX | V_EGRCNTX(q->cntxt_id)); | |
896 | } | |
897 | #else | |
898 | wmb(); /* write descriptors before telling HW */ | |
899 | t3_write_reg(adap, A_SG_KDOORBELL, | |
900 | F_SELEGRCNTX | V_EGRCNTX(q->cntxt_id)); | |
901 | #endif | |
902 | } | |
903 | ||
904 | static inline void wr_gen2(struct tx_desc *d, unsigned int gen) | |
905 | { | |
906 | #if SGE_NUM_GENBITS == 2 | |
907 | d->flit[TX_DESC_FLITS - 1] = cpu_to_be64(gen); | |
908 | #endif | |
909 | } | |
910 | ||
911 | /** | |
912 | * write_wr_hdr_sgl - write a WR header and, optionally, SGL | |
913 | * @ndesc: number of Tx descriptors spanned by the SGL | |
914 | * @skb: the packet corresponding to the WR | |
915 | * @d: first Tx descriptor to be written | |
916 | * @pidx: index of above descriptors | |
917 | * @q: the SGE Tx queue | |
918 | * @sgl: the SGL | |
919 | * @flits: number of flits to the start of the SGL in the first descriptor | |
920 | * @sgl_flits: the SGL size in flits | |
921 | * @gen: the Tx descriptor generation | |
922 | * @wr_hi: top 32 bits of WR header based on WR type (big endian) | |
923 | * @wr_lo: low 32 bits of WR header based on WR type (big endian) | |
924 | * | |
925 | * Write a work request header and an associated SGL. If the SGL is | |
926 | * small enough to fit into one Tx descriptor it has already been written | |
927 | * and we just need to write the WR header. Otherwise we distribute the | |
928 | * SGL across the number of descriptors it spans. | |
929 | */ | |
930 | static void write_wr_hdr_sgl(unsigned int ndesc, struct sk_buff *skb, | |
931 | struct tx_desc *d, unsigned int pidx, | |
932 | const struct sge_txq *q, | |
933 | const struct sg_ent *sgl, | |
934 | unsigned int flits, unsigned int sgl_flits, | |
fb8e4444 AV |
935 | unsigned int gen, __be32 wr_hi, |
936 | __be32 wr_lo) | |
4d22de3e DLR |
937 | { |
938 | struct work_request_hdr *wrp = (struct work_request_hdr *)d; | |
939 | struct tx_sw_desc *sd = &q->sdesc[pidx]; | |
940 | ||
941 | sd->skb = skb; | |
942 | if (need_skb_unmap()) { | |
23561c94 DLR |
943 | sd->fragidx = 0; |
944 | sd->addr_idx = 0; | |
945 | sd->sflit = flits; | |
4d22de3e DLR |
946 | } |
947 | ||
948 | if (likely(ndesc == 1)) { | |
23561c94 | 949 | sd->eop = 1; |
4d22de3e DLR |
950 | wrp->wr_hi = htonl(F_WR_SOP | F_WR_EOP | V_WR_DATATYPE(1) | |
951 | V_WR_SGLSFLT(flits)) | wr_hi; | |
952 | wmb(); | |
953 | wrp->wr_lo = htonl(V_WR_LEN(flits + sgl_flits) | | |
954 | V_WR_GEN(gen)) | wr_lo; | |
955 | wr_gen2(d, gen); | |
956 | } else { | |
957 | unsigned int ogen = gen; | |
958 | const u64 *fp = (const u64 *)sgl; | |
959 | struct work_request_hdr *wp = wrp; | |
960 | ||
961 | wrp->wr_hi = htonl(F_WR_SOP | V_WR_DATATYPE(1) | | |
962 | V_WR_SGLSFLT(flits)) | wr_hi; | |
963 | ||
964 | while (sgl_flits) { | |
965 | unsigned int avail = WR_FLITS - flits; | |
966 | ||
967 | if (avail > sgl_flits) | |
968 | avail = sgl_flits; | |
969 | memcpy(&d->flit[flits], fp, avail * sizeof(*fp)); | |
970 | sgl_flits -= avail; | |
971 | ndesc--; | |
972 | if (!sgl_flits) | |
973 | break; | |
974 | ||
975 | fp += avail; | |
976 | d++; | |
23561c94 | 977 | sd->eop = 0; |
4d22de3e DLR |
978 | sd++; |
979 | if (++pidx == q->size) { | |
980 | pidx = 0; | |
981 | gen ^= 1; | |
982 | d = q->desc; | |
983 | sd = q->sdesc; | |
984 | } | |
985 | ||
986 | sd->skb = skb; | |
987 | wrp = (struct work_request_hdr *)d; | |
988 | wrp->wr_hi = htonl(V_WR_DATATYPE(1) | | |
989 | V_WR_SGLSFLT(1)) | wr_hi; | |
990 | wrp->wr_lo = htonl(V_WR_LEN(min(WR_FLITS, | |
991 | sgl_flits + 1)) | | |
992 | V_WR_GEN(gen)) | wr_lo; | |
993 | wr_gen2(d, gen); | |
994 | flits = 1; | |
995 | } | |
23561c94 | 996 | sd->eop = 1; |
4d22de3e DLR |
997 | wrp->wr_hi |= htonl(F_WR_EOP); |
998 | wmb(); | |
999 | wp->wr_lo = htonl(V_WR_LEN(WR_FLITS) | V_WR_GEN(ogen)) | wr_lo; | |
1000 | wr_gen2((struct tx_desc *)wp, ogen); | |
1001 | WARN_ON(ndesc != 0); | |
1002 | } | |
1003 | } | |
1004 | ||
1005 | /** | |
1006 | * write_tx_pkt_wr - write a TX_PKT work request | |
1007 | * @adap: the adapter | |
1008 | * @skb: the packet to send | |
1009 | * @pi: the egress interface | |
1010 | * @pidx: index of the first Tx descriptor to write | |
1011 | * @gen: the generation value to use | |
1012 | * @q: the Tx queue | |
1013 | * @ndesc: number of descriptors the packet will occupy | |
1014 | * @compl: the value of the COMPL bit to use | |
1015 | * | |
1016 | * Generate a TX_PKT work request to send the supplied packet. | |
1017 | */ | |
1018 | static void write_tx_pkt_wr(struct adapter *adap, struct sk_buff *skb, | |
1019 | const struct port_info *pi, | |
1020 | unsigned int pidx, unsigned int gen, | |
1021 | struct sge_txq *q, unsigned int ndesc, | |
1022 | unsigned int compl) | |
1023 | { | |
1024 | unsigned int flits, sgl_flits, cntrl, tso_info; | |
1025 | struct sg_ent *sgp, sgl[MAX_SKB_FRAGS / 2 + 1]; | |
1026 | struct tx_desc *d = &q->desc[pidx]; | |
1027 | struct cpl_tx_pkt *cpl = (struct cpl_tx_pkt *)d; | |
1028 | ||
1029 | cpl->len = htonl(skb->len | 0x80000000); | |
1030 | cntrl = V_TXPKT_INTF(pi->port_id); | |
1031 | ||
1032 | if (vlan_tx_tag_present(skb) && pi->vlan_grp) | |
1033 | cntrl |= F_TXPKT_VLAN_VLD | V_TXPKT_VLAN(vlan_tx_tag_get(skb)); | |
1034 | ||
1035 | tso_info = V_LSO_MSS(skb_shinfo(skb)->gso_size); | |
1036 | if (tso_info) { | |
1037 | int eth_type; | |
1038 | struct cpl_tx_pkt_lso *hdr = (struct cpl_tx_pkt_lso *)cpl; | |
1039 | ||
1040 | d->flit[2] = 0; | |
1041 | cntrl |= V_TXPKT_OPCODE(CPL_TX_PKT_LSO); | |
1042 | hdr->cntrl = htonl(cntrl); | |
bbe735e4 | 1043 | eth_type = skb_network_offset(skb) == ETH_HLEN ? |
4d22de3e DLR |
1044 | CPL_ETH_II : CPL_ETH_II_VLAN; |
1045 | tso_info |= V_LSO_ETH_TYPE(eth_type) | | |
eddc9ec5 | 1046 | V_LSO_IPHDR_WORDS(ip_hdr(skb)->ihl) | |
aa8223c7 | 1047 | V_LSO_TCPHDR_WORDS(tcp_hdr(skb)->doff); |
4d22de3e DLR |
1048 | hdr->lso_info = htonl(tso_info); |
1049 | flits = 3; | |
1050 | } else { | |
1051 | cntrl |= V_TXPKT_OPCODE(CPL_TX_PKT); | |
1052 | cntrl |= F_TXPKT_IPCSUM_DIS; /* SW calculates IP csum */ | |
1053 | cntrl |= V_TXPKT_L4CSUM_DIS(skb->ip_summed != CHECKSUM_PARTIAL); | |
1054 | cpl->cntrl = htonl(cntrl); | |
1055 | ||
1056 | if (skb->len <= WR_LEN - sizeof(*cpl)) { | |
1057 | q->sdesc[pidx].skb = NULL; | |
1058 | if (!skb->data_len) | |
d626f62b ACM |
1059 | skb_copy_from_linear_data(skb, &d->flit[2], |
1060 | skb->len); | |
4d22de3e DLR |
1061 | else |
1062 | skb_copy_bits(skb, 0, &d->flit[2], skb->len); | |
1063 | ||
1064 | flits = (skb->len + 7) / 8 + 2; | |
1065 | cpl->wr.wr_hi = htonl(V_WR_BCNTLFLT(skb->len & 7) | | |
1066 | V_WR_OP(FW_WROPCODE_TUNNEL_TX_PKT) | |
1067 | | F_WR_SOP | F_WR_EOP | compl); | |
1068 | wmb(); | |
1069 | cpl->wr.wr_lo = htonl(V_WR_LEN(flits) | V_WR_GEN(gen) | | |
1070 | V_WR_TID(q->token)); | |
1071 | wr_gen2(d, gen); | |
1072 | kfree_skb(skb); | |
1073 | return; | |
1074 | } | |
1075 | ||
1076 | flits = 2; | |
1077 | } | |
1078 | ||
1079 | sgp = ndesc == 1 ? (struct sg_ent *)&d->flit[flits] : sgl; | |
1080 | sgl_flits = make_sgl(skb, sgp, skb->data, skb_headlen(skb), adap->pdev); | |
4d22de3e DLR |
1081 | |
1082 | write_wr_hdr_sgl(ndesc, skb, d, pidx, q, sgl, flits, sgl_flits, gen, | |
1083 | htonl(V_WR_OP(FW_WROPCODE_TUNNEL_TX_PKT) | compl), | |
1084 | htonl(V_WR_TID(q->token))); | |
1085 | } | |
1086 | ||
a8cc21f6 KK |
1087 | static inline void t3_stop_queue(struct net_device *dev, struct sge_qset *qs, |
1088 | struct sge_txq *q) | |
1089 | { | |
1090 | netif_stop_queue(dev); | |
1091 | set_bit(TXQ_ETH, &qs->txq_stopped); | |
1092 | q->stops++; | |
1093 | } | |
1094 | ||
4d22de3e DLR |
1095 | /** |
1096 | * eth_xmit - add a packet to the Ethernet Tx queue | |
1097 | * @skb: the packet | |
1098 | * @dev: the egress net device | |
1099 | * | |
1100 | * Add a packet to an SGE Tx queue. Runs with softirqs disabled. | |
1101 | */ | |
1102 | int t3_eth_xmit(struct sk_buff *skb, struct net_device *dev) | |
1103 | { | |
1104 | unsigned int ndesc, pidx, credits, gen, compl; | |
1105 | const struct port_info *pi = netdev_priv(dev); | |
5fbf816f | 1106 | struct adapter *adap = pi->adapter; |
bea3348e | 1107 | struct sge_qset *qs = pi->qs; |
4d22de3e DLR |
1108 | struct sge_txq *q = &qs->txq[TXQ_ETH]; |
1109 | ||
1110 | /* | |
1111 | * The chip min packet length is 9 octets but play safe and reject | |
1112 | * anything shorter than an Ethernet header. | |
1113 | */ | |
1114 | if (unlikely(skb->len < ETH_HLEN)) { | |
1115 | dev_kfree_skb(skb); | |
1116 | return NETDEV_TX_OK; | |
1117 | } | |
1118 | ||
1119 | spin_lock(&q->lock); | |
1120 | reclaim_completed_tx(adap, q); | |
1121 | ||
1122 | credits = q->size - q->in_use; | |
1123 | ndesc = calc_tx_descs(skb); | |
1124 | ||
1125 | if (unlikely(credits < ndesc)) { | |
a8cc21f6 KK |
1126 | t3_stop_queue(dev, qs, q); |
1127 | dev_err(&adap->pdev->dev, | |
1128 | "%s: Tx ring %u full while queue awake!\n", | |
1129 | dev->name, q->cntxt_id & 7); | |
4d22de3e DLR |
1130 | spin_unlock(&q->lock); |
1131 | return NETDEV_TX_BUSY; | |
1132 | } | |
1133 | ||
1134 | q->in_use += ndesc; | |
cd7e9034 DLR |
1135 | if (unlikely(credits - ndesc < q->stop_thres)) { |
1136 | t3_stop_queue(dev, qs, q); | |
1137 | ||
1138 | if (should_restart_tx(q) && | |
1139 | test_and_clear_bit(TXQ_ETH, &qs->txq_stopped)) { | |
1140 | q->restarts++; | |
1141 | netif_wake_queue(dev); | |
1142 | } | |
1143 | } | |
4d22de3e DLR |
1144 | |
1145 | gen = q->gen; | |
1146 | q->unacked += ndesc; | |
1147 | compl = (q->unacked & 8) << (S_WR_COMPL - 3); | |
1148 | q->unacked &= 7; | |
1149 | pidx = q->pidx; | |
1150 | q->pidx += ndesc; | |
1151 | if (q->pidx >= q->size) { | |
1152 | q->pidx -= q->size; | |
1153 | q->gen ^= 1; | |
1154 | } | |
1155 | ||
1156 | /* update port statistics */ | |
1157 | if (skb->ip_summed == CHECKSUM_COMPLETE) | |
1158 | qs->port_stats[SGE_PSTAT_TX_CSUM]++; | |
1159 | if (skb_shinfo(skb)->gso_size) | |
1160 | qs->port_stats[SGE_PSTAT_TSO]++; | |
1161 | if (vlan_tx_tag_present(skb) && pi->vlan_grp) | |
1162 | qs->port_stats[SGE_PSTAT_VLANINS]++; | |
1163 | ||
1164 | dev->trans_start = jiffies; | |
1165 | spin_unlock(&q->lock); | |
1166 | ||
1167 | /* | |
1168 | * We do not use Tx completion interrupts to free DMAd Tx packets. | |
1169 | * This is good for performamce but means that we rely on new Tx | |
1170 | * packets arriving to run the destructors of completed packets, | |
1171 | * which open up space in their sockets' send queues. Sometimes | |
1172 | * we do not get such new packets causing Tx to stall. A single | |
1173 | * UDP transmitter is a good example of this situation. We have | |
1174 | * a clean up timer that periodically reclaims completed packets | |
1175 | * but it doesn't run often enough (nor do we want it to) to prevent | |
1176 | * lengthy stalls. A solution to this problem is to run the | |
1177 | * destructor early, after the packet is queued but before it's DMAd. | |
1178 | * A cons is that we lie to socket memory accounting, but the amount | |
1179 | * of extra memory is reasonable (limited by the number of Tx | |
1180 | * descriptors), the packets do actually get freed quickly by new | |
1181 | * packets almost always, and for protocols like TCP that wait for | |
1182 | * acks to really free up the data the extra memory is even less. | |
1183 | * On the positive side we run the destructors on the sending CPU | |
1184 | * rather than on a potentially different completing CPU, usually a | |
1185 | * good thing. We also run them without holding our Tx queue lock, | |
1186 | * unlike what reclaim_completed_tx() would otherwise do. | |
1187 | * | |
1188 | * Run the destructor before telling the DMA engine about the packet | |
1189 | * to make sure it doesn't complete and get freed prematurely. | |
1190 | */ | |
1191 | if (likely(!skb_shared(skb))) | |
1192 | skb_orphan(skb); | |
1193 | ||
1194 | write_tx_pkt_wr(adap, skb, pi, pidx, gen, q, ndesc, compl); | |
1195 | check_ring_tx_db(adap, q); | |
1196 | return NETDEV_TX_OK; | |
1197 | } | |
1198 | ||
1199 | /** | |
1200 | * write_imm - write a packet into a Tx descriptor as immediate data | |
1201 | * @d: the Tx descriptor to write | |
1202 | * @skb: the packet | |
1203 | * @len: the length of packet data to write as immediate data | |
1204 | * @gen: the generation bit value to write | |
1205 | * | |
1206 | * Writes a packet as immediate data into a Tx descriptor. The packet | |
1207 | * contains a work request at its beginning. We must write the packet | |
27186dc3 DLR |
1208 | * carefully so the SGE doesn't read it accidentally before it's written |
1209 | * in its entirety. | |
4d22de3e DLR |
1210 | */ |
1211 | static inline void write_imm(struct tx_desc *d, struct sk_buff *skb, | |
1212 | unsigned int len, unsigned int gen) | |
1213 | { | |
1214 | struct work_request_hdr *from = (struct work_request_hdr *)skb->data; | |
1215 | struct work_request_hdr *to = (struct work_request_hdr *)d; | |
1216 | ||
27186dc3 DLR |
1217 | if (likely(!skb->data_len)) |
1218 | memcpy(&to[1], &from[1], len - sizeof(*from)); | |
1219 | else | |
1220 | skb_copy_bits(skb, sizeof(*from), &to[1], len - sizeof(*from)); | |
1221 | ||
4d22de3e DLR |
1222 | to->wr_hi = from->wr_hi | htonl(F_WR_SOP | F_WR_EOP | |
1223 | V_WR_BCNTLFLT(len & 7)); | |
1224 | wmb(); | |
1225 | to->wr_lo = from->wr_lo | htonl(V_WR_GEN(gen) | | |
1226 | V_WR_LEN((len + 7) / 8)); | |
1227 | wr_gen2(d, gen); | |
1228 | kfree_skb(skb); | |
1229 | } | |
1230 | ||
1231 | /** | |
1232 | * check_desc_avail - check descriptor availability on a send queue | |
1233 | * @adap: the adapter | |
1234 | * @q: the send queue | |
1235 | * @skb: the packet needing the descriptors | |
1236 | * @ndesc: the number of Tx descriptors needed | |
1237 | * @qid: the Tx queue number in its queue set (TXQ_OFLD or TXQ_CTRL) | |
1238 | * | |
1239 | * Checks if the requested number of Tx descriptors is available on an | |
1240 | * SGE send queue. If the queue is already suspended or not enough | |
1241 | * descriptors are available the packet is queued for later transmission. | |
1242 | * Must be called with the Tx queue locked. | |
1243 | * | |
1244 | * Returns 0 if enough descriptors are available, 1 if there aren't | |
1245 | * enough descriptors and the packet has been queued, and 2 if the caller | |
1246 | * needs to retry because there weren't enough descriptors at the | |
1247 | * beginning of the call but some freed up in the mean time. | |
1248 | */ | |
1249 | static inline int check_desc_avail(struct adapter *adap, struct sge_txq *q, | |
1250 | struct sk_buff *skb, unsigned int ndesc, | |
1251 | unsigned int qid) | |
1252 | { | |
1253 | if (unlikely(!skb_queue_empty(&q->sendq))) { | |
1254 | addq_exit:__skb_queue_tail(&q->sendq, skb); | |
1255 | return 1; | |
1256 | } | |
1257 | if (unlikely(q->size - q->in_use < ndesc)) { | |
1258 | struct sge_qset *qs = txq_to_qset(q, qid); | |
1259 | ||
1260 | set_bit(qid, &qs->txq_stopped); | |
1261 | smp_mb__after_clear_bit(); | |
1262 | ||
1263 | if (should_restart_tx(q) && | |
1264 | test_and_clear_bit(qid, &qs->txq_stopped)) | |
1265 | return 2; | |
1266 | ||
1267 | q->stops++; | |
1268 | goto addq_exit; | |
1269 | } | |
1270 | return 0; | |
1271 | } | |
1272 | ||
1273 | /** | |
1274 | * reclaim_completed_tx_imm - reclaim completed control-queue Tx descs | |
1275 | * @q: the SGE control Tx queue | |
1276 | * | |
1277 | * This is a variant of reclaim_completed_tx() that is used for Tx queues | |
1278 | * that send only immediate data (presently just the control queues) and | |
1279 | * thus do not have any sk_buffs to release. | |
1280 | */ | |
1281 | static inline void reclaim_completed_tx_imm(struct sge_txq *q) | |
1282 | { | |
1283 | unsigned int reclaim = q->processed - q->cleaned; | |
1284 | ||
1285 | q->in_use -= reclaim; | |
1286 | q->cleaned += reclaim; | |
1287 | } | |
1288 | ||
1289 | static inline int immediate(const struct sk_buff *skb) | |
1290 | { | |
27186dc3 | 1291 | return skb->len <= WR_LEN; |
4d22de3e DLR |
1292 | } |
1293 | ||
1294 | /** | |
1295 | * ctrl_xmit - send a packet through an SGE control Tx queue | |
1296 | * @adap: the adapter | |
1297 | * @q: the control queue | |
1298 | * @skb: the packet | |
1299 | * | |
1300 | * Send a packet through an SGE control Tx queue. Packets sent through | |
1301 | * a control queue must fit entirely as immediate data in a single Tx | |
1302 | * descriptor and have no page fragments. | |
1303 | */ | |
1304 | static int ctrl_xmit(struct adapter *adap, struct sge_txq *q, | |
1305 | struct sk_buff *skb) | |
1306 | { | |
1307 | int ret; | |
1308 | struct work_request_hdr *wrp = (struct work_request_hdr *)skb->data; | |
1309 | ||
1310 | if (unlikely(!immediate(skb))) { | |
1311 | WARN_ON(1); | |
1312 | dev_kfree_skb(skb); | |
1313 | return NET_XMIT_SUCCESS; | |
1314 | } | |
1315 | ||
1316 | wrp->wr_hi |= htonl(F_WR_SOP | F_WR_EOP); | |
1317 | wrp->wr_lo = htonl(V_WR_TID(q->token)); | |
1318 | ||
1319 | spin_lock(&q->lock); | |
1320 | again:reclaim_completed_tx_imm(q); | |
1321 | ||
1322 | ret = check_desc_avail(adap, q, skb, 1, TXQ_CTRL); | |
1323 | if (unlikely(ret)) { | |
1324 | if (ret == 1) { | |
1325 | spin_unlock(&q->lock); | |
1326 | return NET_XMIT_CN; | |
1327 | } | |
1328 | goto again; | |
1329 | } | |
1330 | ||
1331 | write_imm(&q->desc[q->pidx], skb, skb->len, q->gen); | |
1332 | ||
1333 | q->in_use++; | |
1334 | if (++q->pidx >= q->size) { | |
1335 | q->pidx = 0; | |
1336 | q->gen ^= 1; | |
1337 | } | |
1338 | spin_unlock(&q->lock); | |
1339 | wmb(); | |
1340 | t3_write_reg(adap, A_SG_KDOORBELL, | |
1341 | F_SELEGRCNTX | V_EGRCNTX(q->cntxt_id)); | |
1342 | return NET_XMIT_SUCCESS; | |
1343 | } | |
1344 | ||
1345 | /** | |
1346 | * restart_ctrlq - restart a suspended control queue | |
1347 | * @qs: the queue set cotaining the control queue | |
1348 | * | |
1349 | * Resumes transmission on a suspended Tx control queue. | |
1350 | */ | |
1351 | static void restart_ctrlq(unsigned long data) | |
1352 | { | |
1353 | struct sk_buff *skb; | |
1354 | struct sge_qset *qs = (struct sge_qset *)data; | |
1355 | struct sge_txq *q = &qs->txq[TXQ_CTRL]; | |
4d22de3e DLR |
1356 | |
1357 | spin_lock(&q->lock); | |
1358 | again:reclaim_completed_tx_imm(q); | |
1359 | ||
bea3348e SH |
1360 | while (q->in_use < q->size && |
1361 | (skb = __skb_dequeue(&q->sendq)) != NULL) { | |
4d22de3e DLR |
1362 | |
1363 | write_imm(&q->desc[q->pidx], skb, skb->len, q->gen); | |
1364 | ||
1365 | if (++q->pidx >= q->size) { | |
1366 | q->pidx = 0; | |
1367 | q->gen ^= 1; | |
1368 | } | |
1369 | q->in_use++; | |
1370 | } | |
1371 | ||
1372 | if (!skb_queue_empty(&q->sendq)) { | |
1373 | set_bit(TXQ_CTRL, &qs->txq_stopped); | |
1374 | smp_mb__after_clear_bit(); | |
1375 | ||
1376 | if (should_restart_tx(q) && | |
1377 | test_and_clear_bit(TXQ_CTRL, &qs->txq_stopped)) | |
1378 | goto again; | |
1379 | q->stops++; | |
1380 | } | |
1381 | ||
1382 | spin_unlock(&q->lock); | |
afefce66 | 1383 | wmb(); |
bea3348e | 1384 | t3_write_reg(qs->adap, A_SG_KDOORBELL, |
4d22de3e DLR |
1385 | F_SELEGRCNTX | V_EGRCNTX(q->cntxt_id)); |
1386 | } | |
1387 | ||
14ab9892 DLR |
1388 | /* |
1389 | * Send a management message through control queue 0 | |
1390 | */ | |
1391 | int t3_mgmt_tx(struct adapter *adap, struct sk_buff *skb) | |
1392 | { | |
204e2f98 | 1393 | int ret; |
bc4b6b52 DLR |
1394 | local_bh_disable(); |
1395 | ret = ctrl_xmit(adap, &adap->sge.qs[0].txq[TXQ_CTRL], skb); | |
1396 | local_bh_enable(); | |
1397 | ||
1398 | return ret; | |
14ab9892 DLR |
1399 | } |
1400 | ||
99d7cf30 DLR |
1401 | /** |
1402 | * deferred_unmap_destructor - unmap a packet when it is freed | |
1403 | * @skb: the packet | |
1404 | * | |
1405 | * This is the packet destructor used for Tx packets that need to remain | |
1406 | * mapped until they are freed rather than until their Tx descriptors are | |
1407 | * freed. | |
1408 | */ | |
1409 | static void deferred_unmap_destructor(struct sk_buff *skb) | |
1410 | { | |
1411 | int i; | |
1412 | const dma_addr_t *p; | |
1413 | const struct skb_shared_info *si; | |
1414 | const struct deferred_unmap_info *dui; | |
99d7cf30 DLR |
1415 | |
1416 | dui = (struct deferred_unmap_info *)skb->head; | |
1417 | p = dui->addr; | |
1418 | ||
23561c94 DLR |
1419 | if (skb->tail - skb->transport_header) |
1420 | pci_unmap_single(dui->pdev, *p++, | |
1421 | skb->tail - skb->transport_header, | |
1422 | PCI_DMA_TODEVICE); | |
99d7cf30 DLR |
1423 | |
1424 | si = skb_shinfo(skb); | |
1425 | for (i = 0; i < si->nr_frags; i++) | |
1426 | pci_unmap_page(dui->pdev, *p++, si->frags[i].size, | |
1427 | PCI_DMA_TODEVICE); | |
1428 | } | |
1429 | ||
1430 | static void setup_deferred_unmapping(struct sk_buff *skb, struct pci_dev *pdev, | |
1431 | const struct sg_ent *sgl, int sgl_flits) | |
1432 | { | |
1433 | dma_addr_t *p; | |
1434 | struct deferred_unmap_info *dui; | |
1435 | ||
1436 | dui = (struct deferred_unmap_info *)skb->head; | |
1437 | dui->pdev = pdev; | |
1438 | for (p = dui->addr; sgl_flits >= 3; sgl++, sgl_flits -= 3) { | |
1439 | *p++ = be64_to_cpu(sgl->addr[0]); | |
1440 | *p++ = be64_to_cpu(sgl->addr[1]); | |
1441 | } | |
1442 | if (sgl_flits) | |
1443 | *p = be64_to_cpu(sgl->addr[0]); | |
1444 | } | |
1445 | ||
4d22de3e DLR |
1446 | /** |
1447 | * write_ofld_wr - write an offload work request | |
1448 | * @adap: the adapter | |
1449 | * @skb: the packet to send | |
1450 | * @q: the Tx queue | |
1451 | * @pidx: index of the first Tx descriptor to write | |
1452 | * @gen: the generation value to use | |
1453 | * @ndesc: number of descriptors the packet will occupy | |
1454 | * | |
1455 | * Write an offload work request to send the supplied packet. The packet | |
1456 | * data already carry the work request with most fields populated. | |
1457 | */ | |
1458 | static void write_ofld_wr(struct adapter *adap, struct sk_buff *skb, | |
1459 | struct sge_txq *q, unsigned int pidx, | |
1460 | unsigned int gen, unsigned int ndesc) | |
1461 | { | |
1462 | unsigned int sgl_flits, flits; | |
1463 | struct work_request_hdr *from; | |
1464 | struct sg_ent *sgp, sgl[MAX_SKB_FRAGS / 2 + 1]; | |
1465 | struct tx_desc *d = &q->desc[pidx]; | |
1466 | ||
1467 | if (immediate(skb)) { | |
1468 | q->sdesc[pidx].skb = NULL; | |
1469 | write_imm(d, skb, skb->len, gen); | |
1470 | return; | |
1471 | } | |
1472 | ||
1473 | /* Only TX_DATA builds SGLs */ | |
1474 | ||
1475 | from = (struct work_request_hdr *)skb->data; | |
ea2ae17d ACM |
1476 | memcpy(&d->flit[1], &from[1], |
1477 | skb_transport_offset(skb) - sizeof(*from)); | |
4d22de3e | 1478 | |
ea2ae17d | 1479 | flits = skb_transport_offset(skb) / 8; |
4d22de3e | 1480 | sgp = ndesc == 1 ? (struct sg_ent *)&d->flit[flits] : sgl; |
9c70220b | 1481 | sgl_flits = make_sgl(skb, sgp, skb_transport_header(skb), |
27a884dc | 1482 | skb->tail - skb->transport_header, |
4d22de3e | 1483 | adap->pdev); |
99d7cf30 DLR |
1484 | if (need_skb_unmap()) { |
1485 | setup_deferred_unmapping(skb, adap->pdev, sgp, sgl_flits); | |
1486 | skb->destructor = deferred_unmap_destructor; | |
99d7cf30 | 1487 | } |
4d22de3e DLR |
1488 | |
1489 | write_wr_hdr_sgl(ndesc, skb, d, pidx, q, sgl, flits, sgl_flits, | |
1490 | gen, from->wr_hi, from->wr_lo); | |
1491 | } | |
1492 | ||
1493 | /** | |
1494 | * calc_tx_descs_ofld - calculate # of Tx descriptors for an offload packet | |
1495 | * @skb: the packet | |
1496 | * | |
1497 | * Returns the number of Tx descriptors needed for the given offload | |
1498 | * packet. These packets are already fully constructed. | |
1499 | */ | |
1500 | static inline unsigned int calc_tx_descs_ofld(const struct sk_buff *skb) | |
1501 | { | |
27186dc3 | 1502 | unsigned int flits, cnt; |
4d22de3e | 1503 | |
27186dc3 | 1504 | if (skb->len <= WR_LEN) |
4d22de3e DLR |
1505 | return 1; /* packet fits as immediate data */ |
1506 | ||
ea2ae17d | 1507 | flits = skb_transport_offset(skb) / 8; /* headers */ |
27186dc3 | 1508 | cnt = skb_shinfo(skb)->nr_frags; |
27a884dc | 1509 | if (skb->tail != skb->transport_header) |
4d22de3e DLR |
1510 | cnt++; |
1511 | return flits_to_desc(flits + sgl_len(cnt)); | |
1512 | } | |
1513 | ||
1514 | /** | |
1515 | * ofld_xmit - send a packet through an offload queue | |
1516 | * @adap: the adapter | |
1517 | * @q: the Tx offload queue | |
1518 | * @skb: the packet | |
1519 | * | |
1520 | * Send an offload packet through an SGE offload queue. | |
1521 | */ | |
1522 | static int ofld_xmit(struct adapter *adap, struct sge_txq *q, | |
1523 | struct sk_buff *skb) | |
1524 | { | |
1525 | int ret; | |
1526 | unsigned int ndesc = calc_tx_descs_ofld(skb), pidx, gen; | |
1527 | ||
1528 | spin_lock(&q->lock); | |
1529 | again:reclaim_completed_tx(adap, q); | |
1530 | ||
1531 | ret = check_desc_avail(adap, q, skb, ndesc, TXQ_OFLD); | |
1532 | if (unlikely(ret)) { | |
1533 | if (ret == 1) { | |
1534 | skb->priority = ndesc; /* save for restart */ | |
1535 | spin_unlock(&q->lock); | |
1536 | return NET_XMIT_CN; | |
1537 | } | |
1538 | goto again; | |
1539 | } | |
1540 | ||
1541 | gen = q->gen; | |
1542 | q->in_use += ndesc; | |
1543 | pidx = q->pidx; | |
1544 | q->pidx += ndesc; | |
1545 | if (q->pidx >= q->size) { | |
1546 | q->pidx -= q->size; | |
1547 | q->gen ^= 1; | |
1548 | } | |
1549 | spin_unlock(&q->lock); | |
1550 | ||
1551 | write_ofld_wr(adap, skb, q, pidx, gen, ndesc); | |
1552 | check_ring_tx_db(adap, q); | |
1553 | return NET_XMIT_SUCCESS; | |
1554 | } | |
1555 | ||
1556 | /** | |
1557 | * restart_offloadq - restart a suspended offload queue | |
1558 | * @qs: the queue set cotaining the offload queue | |
1559 | * | |
1560 | * Resumes transmission on a suspended Tx offload queue. | |
1561 | */ | |
1562 | static void restart_offloadq(unsigned long data) | |
1563 | { | |
1564 | struct sk_buff *skb; | |
1565 | struct sge_qset *qs = (struct sge_qset *)data; | |
1566 | struct sge_txq *q = &qs->txq[TXQ_OFLD]; | |
5fbf816f DLR |
1567 | const struct port_info *pi = netdev_priv(qs->netdev); |
1568 | struct adapter *adap = pi->adapter; | |
4d22de3e DLR |
1569 | |
1570 | spin_lock(&q->lock); | |
1571 | again:reclaim_completed_tx(adap, q); | |
1572 | ||
1573 | while ((skb = skb_peek(&q->sendq)) != NULL) { | |
1574 | unsigned int gen, pidx; | |
1575 | unsigned int ndesc = skb->priority; | |
1576 | ||
1577 | if (unlikely(q->size - q->in_use < ndesc)) { | |
1578 | set_bit(TXQ_OFLD, &qs->txq_stopped); | |
1579 | smp_mb__after_clear_bit(); | |
1580 | ||
1581 | if (should_restart_tx(q) && | |
1582 | test_and_clear_bit(TXQ_OFLD, &qs->txq_stopped)) | |
1583 | goto again; | |
1584 | q->stops++; | |
1585 | break; | |
1586 | } | |
1587 | ||
1588 | gen = q->gen; | |
1589 | q->in_use += ndesc; | |
1590 | pidx = q->pidx; | |
1591 | q->pidx += ndesc; | |
1592 | if (q->pidx >= q->size) { | |
1593 | q->pidx -= q->size; | |
1594 | q->gen ^= 1; | |
1595 | } | |
1596 | __skb_unlink(skb, &q->sendq); | |
1597 | spin_unlock(&q->lock); | |
1598 | ||
1599 | write_ofld_wr(adap, skb, q, pidx, gen, ndesc); | |
1600 | spin_lock(&q->lock); | |
1601 | } | |
1602 | spin_unlock(&q->lock); | |
1603 | ||
1604 | #if USE_GTS | |
1605 | set_bit(TXQ_RUNNING, &q->flags); | |
1606 | set_bit(TXQ_LAST_PKT_DB, &q->flags); | |
1607 | #endif | |
afefce66 | 1608 | wmb(); |
4d22de3e DLR |
1609 | t3_write_reg(adap, A_SG_KDOORBELL, |
1610 | F_SELEGRCNTX | V_EGRCNTX(q->cntxt_id)); | |
1611 | } | |
1612 | ||
1613 | /** | |
1614 | * queue_set - return the queue set a packet should use | |
1615 | * @skb: the packet | |
1616 | * | |
1617 | * Maps a packet to the SGE queue set it should use. The desired queue | |
1618 | * set is carried in bits 1-3 in the packet's priority. | |
1619 | */ | |
1620 | static inline int queue_set(const struct sk_buff *skb) | |
1621 | { | |
1622 | return skb->priority >> 1; | |
1623 | } | |
1624 | ||
1625 | /** | |
1626 | * is_ctrl_pkt - return whether an offload packet is a control packet | |
1627 | * @skb: the packet | |
1628 | * | |
1629 | * Determines whether an offload packet should use an OFLD or a CTRL | |
1630 | * Tx queue. This is indicated by bit 0 in the packet's priority. | |
1631 | */ | |
1632 | static inline int is_ctrl_pkt(const struct sk_buff *skb) | |
1633 | { | |
1634 | return skb->priority & 1; | |
1635 | } | |
1636 | ||
1637 | /** | |
1638 | * t3_offload_tx - send an offload packet | |
1639 | * @tdev: the offload device to send to | |
1640 | * @skb: the packet | |
1641 | * | |
1642 | * Sends an offload packet. We use the packet priority to select the | |
1643 | * appropriate Tx queue as follows: bit 0 indicates whether the packet | |
1644 | * should be sent as regular or control, bits 1-3 select the queue set. | |
1645 | */ | |
1646 | int t3_offload_tx(struct t3cdev *tdev, struct sk_buff *skb) | |
1647 | { | |
1648 | struct adapter *adap = tdev2adap(tdev); | |
1649 | struct sge_qset *qs = &adap->sge.qs[queue_set(skb)]; | |
1650 | ||
1651 | if (unlikely(is_ctrl_pkt(skb))) | |
1652 | return ctrl_xmit(adap, &qs->txq[TXQ_CTRL], skb); | |
1653 | ||
1654 | return ofld_xmit(adap, &qs->txq[TXQ_OFLD], skb); | |
1655 | } | |
1656 | ||
1657 | /** | |
1658 | * offload_enqueue - add an offload packet to an SGE offload receive queue | |
1659 | * @q: the SGE response queue | |
1660 | * @skb: the packet | |
1661 | * | |
1662 | * Add a new offload packet to an SGE response queue's offload packet | |
1663 | * queue. If the packet is the first on the queue it schedules the RX | |
1664 | * softirq to process the queue. | |
1665 | */ | |
1666 | static inline void offload_enqueue(struct sge_rspq *q, struct sk_buff *skb) | |
1667 | { | |
1668 | skb->next = skb->prev = NULL; | |
1669 | if (q->rx_tail) | |
1670 | q->rx_tail->next = skb; | |
1671 | else { | |
1672 | struct sge_qset *qs = rspq_to_qset(q); | |
1673 | ||
bea3348e | 1674 | napi_schedule(&qs->napi); |
4d22de3e DLR |
1675 | q->rx_head = skb; |
1676 | } | |
1677 | q->rx_tail = skb; | |
1678 | } | |
1679 | ||
1680 | /** | |
1681 | * deliver_partial_bundle - deliver a (partial) bundle of Rx offload pkts | |
1682 | * @tdev: the offload device that will be receiving the packets | |
1683 | * @q: the SGE response queue that assembled the bundle | |
1684 | * @skbs: the partial bundle | |
1685 | * @n: the number of packets in the bundle | |
1686 | * | |
1687 | * Delivers a (partial) bundle of Rx offload packets to an offload device. | |
1688 | */ | |
1689 | static inline void deliver_partial_bundle(struct t3cdev *tdev, | |
1690 | struct sge_rspq *q, | |
1691 | struct sk_buff *skbs[], int n) | |
1692 | { | |
1693 | if (n) { | |
1694 | q->offload_bundles++; | |
1695 | tdev->recv(tdev, skbs, n); | |
1696 | } | |
1697 | } | |
1698 | ||
1699 | /** | |
1700 | * ofld_poll - NAPI handler for offload packets in interrupt mode | |
1701 | * @dev: the network device doing the polling | |
1702 | * @budget: polling budget | |
1703 | * | |
1704 | * The NAPI handler for offload packets when a response queue is serviced | |
1705 | * by the hard interrupt handler, i.e., when it's operating in non-polling | |
1706 | * mode. Creates small packet batches and sends them through the offload | |
1707 | * receive handler. Batches need to be of modest size as we do prefetches | |
1708 | * on the packets in each. | |
1709 | */ | |
bea3348e | 1710 | static int ofld_poll(struct napi_struct *napi, int budget) |
4d22de3e | 1711 | { |
bea3348e | 1712 | struct sge_qset *qs = container_of(napi, struct sge_qset, napi); |
4d22de3e | 1713 | struct sge_rspq *q = &qs->rspq; |
bea3348e SH |
1714 | struct adapter *adapter = qs->adap; |
1715 | int work_done = 0; | |
4d22de3e | 1716 | |
bea3348e | 1717 | while (work_done < budget) { |
4d22de3e DLR |
1718 | struct sk_buff *head, *tail, *skbs[RX_BUNDLE_SIZE]; |
1719 | int ngathered; | |
1720 | ||
1721 | spin_lock_irq(&q->lock); | |
1722 | head = q->rx_head; | |
1723 | if (!head) { | |
bea3348e | 1724 | napi_complete(napi); |
4d22de3e | 1725 | spin_unlock_irq(&q->lock); |
bea3348e | 1726 | return work_done; |
4d22de3e DLR |
1727 | } |
1728 | ||
1729 | tail = q->rx_tail; | |
1730 | q->rx_head = q->rx_tail = NULL; | |
1731 | spin_unlock_irq(&q->lock); | |
1732 | ||
bea3348e | 1733 | for (ngathered = 0; work_done < budget && head; work_done++) { |
4d22de3e DLR |
1734 | prefetch(head->data); |
1735 | skbs[ngathered] = head; | |
1736 | head = head->next; | |
1737 | skbs[ngathered]->next = NULL; | |
1738 | if (++ngathered == RX_BUNDLE_SIZE) { | |
1739 | q->offload_bundles++; | |
1740 | adapter->tdev.recv(&adapter->tdev, skbs, | |
1741 | ngathered); | |
1742 | ngathered = 0; | |
1743 | } | |
1744 | } | |
1745 | if (head) { /* splice remaining packets back onto Rx queue */ | |
1746 | spin_lock_irq(&q->lock); | |
1747 | tail->next = q->rx_head; | |
1748 | if (!q->rx_head) | |
1749 | q->rx_tail = tail; | |
1750 | q->rx_head = head; | |
1751 | spin_unlock_irq(&q->lock); | |
1752 | } | |
1753 | deliver_partial_bundle(&adapter->tdev, q, skbs, ngathered); | |
1754 | } | |
bea3348e SH |
1755 | |
1756 | return work_done; | |
4d22de3e DLR |
1757 | } |
1758 | ||
1759 | /** | |
1760 | * rx_offload - process a received offload packet | |
1761 | * @tdev: the offload device receiving the packet | |
1762 | * @rq: the response queue that received the packet | |
1763 | * @skb: the packet | |
1764 | * @rx_gather: a gather list of packets if we are building a bundle | |
1765 | * @gather_idx: index of the next available slot in the bundle | |
1766 | * | |
1767 | * Process an ingress offload pakcet and add it to the offload ingress | |
1768 | * queue. Returns the index of the next available slot in the bundle. | |
1769 | */ | |
1770 | static inline int rx_offload(struct t3cdev *tdev, struct sge_rspq *rq, | |
1771 | struct sk_buff *skb, struct sk_buff *rx_gather[], | |
1772 | unsigned int gather_idx) | |
1773 | { | |
459a98ed | 1774 | skb_reset_mac_header(skb); |
c1d2bbe1 | 1775 | skb_reset_network_header(skb); |
badff6d0 | 1776 | skb_reset_transport_header(skb); |
4d22de3e DLR |
1777 | |
1778 | if (rq->polling) { | |
1779 | rx_gather[gather_idx++] = skb; | |
1780 | if (gather_idx == RX_BUNDLE_SIZE) { | |
1781 | tdev->recv(tdev, rx_gather, RX_BUNDLE_SIZE); | |
1782 | gather_idx = 0; | |
1783 | rq->offload_bundles++; | |
1784 | } | |
1785 | } else | |
1786 | offload_enqueue(rq, skb); | |
1787 | ||
1788 | return gather_idx; | |
1789 | } | |
1790 | ||
4d22de3e DLR |
1791 | /** |
1792 | * restart_tx - check whether to restart suspended Tx queues | |
1793 | * @qs: the queue set to resume | |
1794 | * | |
1795 | * Restarts suspended Tx queues of an SGE queue set if they have enough | |
1796 | * free resources to resume operation. | |
1797 | */ | |
1798 | static void restart_tx(struct sge_qset *qs) | |
1799 | { | |
1800 | if (test_bit(TXQ_ETH, &qs->txq_stopped) && | |
1801 | should_restart_tx(&qs->txq[TXQ_ETH]) && | |
1802 | test_and_clear_bit(TXQ_ETH, &qs->txq_stopped)) { | |
1803 | qs->txq[TXQ_ETH].restarts++; | |
1804 | if (netif_running(qs->netdev)) | |
1805 | netif_wake_queue(qs->netdev); | |
1806 | } | |
1807 | ||
1808 | if (test_bit(TXQ_OFLD, &qs->txq_stopped) && | |
1809 | should_restart_tx(&qs->txq[TXQ_OFLD]) && | |
1810 | test_and_clear_bit(TXQ_OFLD, &qs->txq_stopped)) { | |
1811 | qs->txq[TXQ_OFLD].restarts++; | |
1812 | tasklet_schedule(&qs->txq[TXQ_OFLD].qresume_tsk); | |
1813 | } | |
1814 | if (test_bit(TXQ_CTRL, &qs->txq_stopped) && | |
1815 | should_restart_tx(&qs->txq[TXQ_CTRL]) && | |
1816 | test_and_clear_bit(TXQ_CTRL, &qs->txq_stopped)) { | |
1817 | qs->txq[TXQ_CTRL].restarts++; | |
1818 | tasklet_schedule(&qs->txq[TXQ_CTRL].qresume_tsk); | |
1819 | } | |
1820 | } | |
1821 | ||
1822 | /** | |
1823 | * rx_eth - process an ingress ethernet packet | |
1824 | * @adap: the adapter | |
1825 | * @rq: the response queue that received the packet | |
1826 | * @skb: the packet | |
1827 | * @pad: amount of padding at the start of the buffer | |
1828 | * | |
1829 | * Process an ingress ethernet pakcet and deliver it to the stack. | |
1830 | * The padding is 2 if the packet was delivered in an Rx buffer and 0 | |
1831 | * if it was immediate data in a response. | |
1832 | */ | |
1833 | static void rx_eth(struct adapter *adap, struct sge_rspq *rq, | |
1834 | struct sk_buff *skb, int pad) | |
1835 | { | |
1836 | struct cpl_rx_pkt *p = (struct cpl_rx_pkt *)(skb->data + pad); | |
1837 | struct port_info *pi; | |
1838 | ||
4d22de3e | 1839 | skb_pull(skb, sizeof(*p) + pad); |
4c13eb66 | 1840 | skb->protocol = eth_type_trans(skb, adap->port[p->iff]); |
e360b562 | 1841 | skb->dev->last_rx = jiffies; |
4d22de3e | 1842 | pi = netdev_priv(skb->dev); |
05e5c116 | 1843 | if (pi->rx_csum_offload && p->csum_valid && p->csum == htons(0xffff) && |
4d22de3e DLR |
1844 | !p->fragment) { |
1845 | rspq_to_qset(rq)->port_stats[SGE_PSTAT_RX_CSUM_GOOD]++; | |
1846 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1847 | } else | |
1848 | skb->ip_summed = CHECKSUM_NONE; | |
1849 | ||
1850 | if (unlikely(p->vlan_valid)) { | |
1851 | struct vlan_group *grp = pi->vlan_grp; | |
1852 | ||
1853 | rspq_to_qset(rq)->port_stats[SGE_PSTAT_VLANEX]++; | |
1854 | if (likely(grp)) | |
1855 | __vlan_hwaccel_rx(skb, grp, ntohs(p->vlan), | |
1856 | rq->polling); | |
1857 | else | |
1858 | dev_kfree_skb_any(skb); | |
1859 | } else if (rq->polling) | |
1860 | netif_receive_skb(skb); | |
1861 | else | |
1862 | netif_rx(skb); | |
1863 | } | |
1864 | ||
1865 | /** | |
1866 | * handle_rsp_cntrl_info - handles control information in a response | |
1867 | * @qs: the queue set corresponding to the response | |
1868 | * @flags: the response control flags | |
4d22de3e DLR |
1869 | * |
1870 | * Handles the control information of an SGE response, such as GTS | |
1871 | * indications and completion credits for the queue set's Tx queues. | |
6195c71d | 1872 | * HW coalesces credits, we don't do any extra SW coalescing. |
4d22de3e | 1873 | */ |
6195c71d | 1874 | static inline void handle_rsp_cntrl_info(struct sge_qset *qs, u32 flags) |
4d22de3e DLR |
1875 | { |
1876 | unsigned int credits; | |
1877 | ||
1878 | #if USE_GTS | |
1879 | if (flags & F_RSPD_TXQ0_GTS) | |
1880 | clear_bit(TXQ_RUNNING, &qs->txq[TXQ_ETH].flags); | |
1881 | #endif | |
1882 | ||
4d22de3e DLR |
1883 | credits = G_RSPD_TXQ0_CR(flags); |
1884 | if (credits) | |
1885 | qs->txq[TXQ_ETH].processed += credits; | |
1886 | ||
6195c71d DLR |
1887 | credits = G_RSPD_TXQ2_CR(flags); |
1888 | if (credits) | |
1889 | qs->txq[TXQ_CTRL].processed += credits; | |
1890 | ||
4d22de3e DLR |
1891 | # if USE_GTS |
1892 | if (flags & F_RSPD_TXQ1_GTS) | |
1893 | clear_bit(TXQ_RUNNING, &qs->txq[TXQ_OFLD].flags); | |
1894 | # endif | |
6195c71d DLR |
1895 | credits = G_RSPD_TXQ1_CR(flags); |
1896 | if (credits) | |
1897 | qs->txq[TXQ_OFLD].processed += credits; | |
4d22de3e DLR |
1898 | } |
1899 | ||
1900 | /** | |
1901 | * check_ring_db - check if we need to ring any doorbells | |
1902 | * @adapter: the adapter | |
1903 | * @qs: the queue set whose Tx queues are to be examined | |
1904 | * @sleeping: indicates which Tx queue sent GTS | |
1905 | * | |
1906 | * Checks if some of a queue set's Tx queues need to ring their doorbells | |
1907 | * to resume transmission after idling while they still have unprocessed | |
1908 | * descriptors. | |
1909 | */ | |
1910 | static void check_ring_db(struct adapter *adap, struct sge_qset *qs, | |
1911 | unsigned int sleeping) | |
1912 | { | |
1913 | if (sleeping & F_RSPD_TXQ0_GTS) { | |
1914 | struct sge_txq *txq = &qs->txq[TXQ_ETH]; | |
1915 | ||
1916 | if (txq->cleaned + txq->in_use != txq->processed && | |
1917 | !test_and_set_bit(TXQ_LAST_PKT_DB, &txq->flags)) { | |
1918 | set_bit(TXQ_RUNNING, &txq->flags); | |
1919 | t3_write_reg(adap, A_SG_KDOORBELL, F_SELEGRCNTX | | |
1920 | V_EGRCNTX(txq->cntxt_id)); | |
1921 | } | |
1922 | } | |
1923 | ||
1924 | if (sleeping & F_RSPD_TXQ1_GTS) { | |
1925 | struct sge_txq *txq = &qs->txq[TXQ_OFLD]; | |
1926 | ||
1927 | if (txq->cleaned + txq->in_use != txq->processed && | |
1928 | !test_and_set_bit(TXQ_LAST_PKT_DB, &txq->flags)) { | |
1929 | set_bit(TXQ_RUNNING, &txq->flags); | |
1930 | t3_write_reg(adap, A_SG_KDOORBELL, F_SELEGRCNTX | | |
1931 | V_EGRCNTX(txq->cntxt_id)); | |
1932 | } | |
1933 | } | |
1934 | } | |
1935 | ||
1936 | /** | |
1937 | * is_new_response - check if a response is newly written | |
1938 | * @r: the response descriptor | |
1939 | * @q: the response queue | |
1940 | * | |
1941 | * Returns true if a response descriptor contains a yet unprocessed | |
1942 | * response. | |
1943 | */ | |
1944 | static inline int is_new_response(const struct rsp_desc *r, | |
1945 | const struct sge_rspq *q) | |
1946 | { | |
1947 | return (r->intr_gen & F_RSPD_GEN2) == q->gen; | |
1948 | } | |
1949 | ||
1950 | #define RSPD_GTS_MASK (F_RSPD_TXQ0_GTS | F_RSPD_TXQ1_GTS) | |
1951 | #define RSPD_CTRL_MASK (RSPD_GTS_MASK | \ | |
1952 | V_RSPD_TXQ0_CR(M_RSPD_TXQ0_CR) | \ | |
1953 | V_RSPD_TXQ1_CR(M_RSPD_TXQ1_CR) | \ | |
1954 | V_RSPD_TXQ2_CR(M_RSPD_TXQ2_CR)) | |
1955 | ||
1956 | /* How long to delay the next interrupt in case of memory shortage, in 0.1us. */ | |
1957 | #define NOMEM_INTR_DELAY 2500 | |
1958 | ||
1959 | /** | |
1960 | * process_responses - process responses from an SGE response queue | |
1961 | * @adap: the adapter | |
1962 | * @qs: the queue set to which the response queue belongs | |
1963 | * @budget: how many responses can be processed in this round | |
1964 | * | |
1965 | * Process responses from an SGE response queue up to the supplied budget. | |
1966 | * Responses include received packets as well as credits and other events | |
1967 | * for the queues that belong to the response queue's queue set. | |
1968 | * A negative budget is effectively unlimited. | |
1969 | * | |
1970 | * Additionally choose the interrupt holdoff time for the next interrupt | |
1971 | * on this queue. If the system is under memory shortage use a fairly | |
1972 | * long delay to help recovery. | |
1973 | */ | |
1974 | static int process_responses(struct adapter *adap, struct sge_qset *qs, | |
1975 | int budget) | |
1976 | { | |
1977 | struct sge_rspq *q = &qs->rspq; | |
1978 | struct rsp_desc *r = &q->desc[q->cidx]; | |
1979 | int budget_left = budget; | |
6195c71d | 1980 | unsigned int sleeping = 0; |
4d22de3e DLR |
1981 | struct sk_buff *offload_skbs[RX_BUNDLE_SIZE]; |
1982 | int ngathered = 0; | |
1983 | ||
1984 | q->next_holdoff = q->holdoff_tmr; | |
1985 | ||
1986 | while (likely(budget_left && is_new_response(r, q))) { | |
e0994eb1 | 1987 | int eth, ethpad = 2; |
4d22de3e DLR |
1988 | struct sk_buff *skb = NULL; |
1989 | u32 len, flags = ntohl(r->flags); | |
05e5c116 | 1990 | __be32 rss_hi = *(const __be32 *)r, rss_lo = r->rss_hdr.rss_hash_val; |
4d22de3e DLR |
1991 | |
1992 | eth = r->rss_hdr.opcode == CPL_RX_PKT; | |
1993 | ||
1994 | if (unlikely(flags & F_RSPD_ASYNC_NOTIF)) { | |
1995 | skb = alloc_skb(AN_PKT_SIZE, GFP_ATOMIC); | |
1996 | if (!skb) | |
1997 | goto no_mem; | |
1998 | ||
1999 | memcpy(__skb_put(skb, AN_PKT_SIZE), r, AN_PKT_SIZE); | |
2000 | skb->data[0] = CPL_ASYNC_NOTIF; | |
2001 | rss_hi = htonl(CPL_ASYNC_NOTIF << 24); | |
2002 | q->async_notif++; | |
2003 | } else if (flags & F_RSPD_IMM_DATA_VALID) { | |
2004 | skb = get_imm_packet(r); | |
2005 | if (unlikely(!skb)) { | |
cf992af5 | 2006 | no_mem: |
4d22de3e DLR |
2007 | q->next_holdoff = NOMEM_INTR_DELAY; |
2008 | q->nomem++; | |
2009 | /* consume one credit since we tried */ | |
2010 | budget_left--; | |
2011 | break; | |
2012 | } | |
2013 | q->imm_data++; | |
e0994eb1 | 2014 | ethpad = 0; |
4d22de3e | 2015 | } else if ((len = ntohl(r->len_cq)) != 0) { |
cf992af5 | 2016 | struct sge_fl *fl; |
e0994eb1 | 2017 | |
cf992af5 DLR |
2018 | fl = (len & F_RSPD_FLQ) ? &qs->fl[1] : &qs->fl[0]; |
2019 | if (fl->use_pages) { | |
2020 | void *addr = fl->sdesc[fl->cidx].pg_chunk.va; | |
e0994eb1 | 2021 | |
cf992af5 DLR |
2022 | prefetch(addr); |
2023 | #if L1_CACHE_BYTES < 128 | |
2024 | prefetch(addr + L1_CACHE_BYTES); | |
2025 | #endif | |
e0994eb1 DLR |
2026 | __refill_fl(adap, fl); |
2027 | ||
cf992af5 DLR |
2028 | skb = get_packet_pg(adap, fl, G_RSPD_LEN(len), |
2029 | eth ? SGE_RX_DROP_THRES : 0); | |
2030 | } else | |
e0994eb1 DLR |
2031 | skb = get_packet(adap, fl, G_RSPD_LEN(len), |
2032 | eth ? SGE_RX_DROP_THRES : 0); | |
cf992af5 DLR |
2033 | if (unlikely(!skb)) { |
2034 | if (!eth) | |
2035 | goto no_mem; | |
2036 | q->rx_drops++; | |
2037 | } else if (unlikely(r->rss_hdr.opcode == CPL_TRACE_PKT)) | |
2038 | __skb_pull(skb, 2); | |
4d22de3e | 2039 | |
4d22de3e DLR |
2040 | if (++fl->cidx == fl->size) |
2041 | fl->cidx = 0; | |
2042 | } else | |
2043 | q->pure_rsps++; | |
2044 | ||
2045 | if (flags & RSPD_CTRL_MASK) { | |
2046 | sleeping |= flags & RSPD_GTS_MASK; | |
6195c71d | 2047 | handle_rsp_cntrl_info(qs, flags); |
4d22de3e DLR |
2048 | } |
2049 | ||
2050 | r++; | |
2051 | if (unlikely(++q->cidx == q->size)) { | |
2052 | q->cidx = 0; | |
2053 | q->gen ^= 1; | |
2054 | r = q->desc; | |
2055 | } | |
2056 | prefetch(r); | |
2057 | ||
2058 | if (++q->credits >= (q->size / 4)) { | |
2059 | refill_rspq(adap, q, q->credits); | |
2060 | q->credits = 0; | |
2061 | } | |
2062 | ||
cf992af5 | 2063 | if (likely(skb != NULL)) { |
4d22de3e DLR |
2064 | if (eth) |
2065 | rx_eth(adap, q, skb, ethpad); | |
2066 | else { | |
afefce66 | 2067 | q->offload_pkts++; |
cf992af5 DLR |
2068 | /* Preserve the RSS info in csum & priority */ |
2069 | skb->csum = rss_hi; | |
2070 | skb->priority = rss_lo; | |
2071 | ngathered = rx_offload(&adap->tdev, q, skb, | |
2072 | offload_skbs, | |
e0994eb1 | 2073 | ngathered); |
4d22de3e DLR |
2074 | } |
2075 | } | |
4d22de3e DLR |
2076 | --budget_left; |
2077 | } | |
2078 | ||
4d22de3e DLR |
2079 | deliver_partial_bundle(&adap->tdev, q, offload_skbs, ngathered); |
2080 | if (sleeping) | |
2081 | check_ring_db(adap, qs, sleeping); | |
2082 | ||
2083 | smp_mb(); /* commit Tx queue .processed updates */ | |
2084 | if (unlikely(qs->txq_stopped != 0)) | |
2085 | restart_tx(qs); | |
2086 | ||
2087 | budget -= budget_left; | |
2088 | return budget; | |
2089 | } | |
2090 | ||
2091 | static inline int is_pure_response(const struct rsp_desc *r) | |
2092 | { | |
2093 | u32 n = ntohl(r->flags) & (F_RSPD_ASYNC_NOTIF | F_RSPD_IMM_DATA_VALID); | |
2094 | ||
2095 | return (n | r->len_cq) == 0; | |
2096 | } | |
2097 | ||
2098 | /** | |
2099 | * napi_rx_handler - the NAPI handler for Rx processing | |
bea3348e | 2100 | * @napi: the napi instance |
4d22de3e DLR |
2101 | * @budget: how many packets we can process in this round |
2102 | * | |
2103 | * Handler for new data events when using NAPI. | |
2104 | */ | |
bea3348e | 2105 | static int napi_rx_handler(struct napi_struct *napi, int budget) |
4d22de3e | 2106 | { |
bea3348e SH |
2107 | struct sge_qset *qs = container_of(napi, struct sge_qset, napi); |
2108 | struct adapter *adap = qs->adap; | |
2109 | int work_done = process_responses(adap, qs, budget); | |
4d22de3e | 2110 | |
bea3348e SH |
2111 | if (likely(work_done < budget)) { |
2112 | napi_complete(napi); | |
4d22de3e | 2113 | |
bea3348e SH |
2114 | /* |
2115 | * Because we don't atomically flush the following | |
2116 | * write it is possible that in very rare cases it can | |
2117 | * reach the device in a way that races with a new | |
2118 | * response being written plus an error interrupt | |
2119 | * causing the NAPI interrupt handler below to return | |
2120 | * unhandled status to the OS. To protect against | |
2121 | * this would require flushing the write and doing | |
2122 | * both the write and the flush with interrupts off. | |
2123 | * Way too expensive and unjustifiable given the | |
2124 | * rarity of the race. | |
2125 | * | |
2126 | * The race cannot happen at all with MSI-X. | |
2127 | */ | |
2128 | t3_write_reg(adap, A_SG_GTS, V_RSPQ(qs->rspq.cntxt_id) | | |
2129 | V_NEWTIMER(qs->rspq.next_holdoff) | | |
2130 | V_NEWINDEX(qs->rspq.cidx)); | |
2131 | } | |
2132 | return work_done; | |
4d22de3e DLR |
2133 | } |
2134 | ||
2135 | /* | |
2136 | * Returns true if the device is already scheduled for polling. | |
2137 | */ | |
bea3348e | 2138 | static inline int napi_is_scheduled(struct napi_struct *napi) |
4d22de3e | 2139 | { |
bea3348e | 2140 | return test_bit(NAPI_STATE_SCHED, &napi->state); |
4d22de3e DLR |
2141 | } |
2142 | ||
2143 | /** | |
2144 | * process_pure_responses - process pure responses from a response queue | |
2145 | * @adap: the adapter | |
2146 | * @qs: the queue set owning the response queue | |
2147 | * @r: the first pure response to process | |
2148 | * | |
2149 | * A simpler version of process_responses() that handles only pure (i.e., | |
2150 | * non data-carrying) responses. Such respones are too light-weight to | |
2151 | * justify calling a softirq under NAPI, so we handle them specially in | |
2152 | * the interrupt handler. The function is called with a pointer to a | |
2153 | * response, which the caller must ensure is a valid pure response. | |
2154 | * | |
2155 | * Returns 1 if it encounters a valid data-carrying response, 0 otherwise. | |
2156 | */ | |
2157 | static int process_pure_responses(struct adapter *adap, struct sge_qset *qs, | |
2158 | struct rsp_desc *r) | |
2159 | { | |
2160 | struct sge_rspq *q = &qs->rspq; | |
6195c71d | 2161 | unsigned int sleeping = 0; |
4d22de3e DLR |
2162 | |
2163 | do { | |
2164 | u32 flags = ntohl(r->flags); | |
2165 | ||
2166 | r++; | |
2167 | if (unlikely(++q->cidx == q->size)) { | |
2168 | q->cidx = 0; | |
2169 | q->gen ^= 1; | |
2170 | r = q->desc; | |
2171 | } | |
2172 | prefetch(r); | |
2173 | ||
2174 | if (flags & RSPD_CTRL_MASK) { | |
2175 | sleeping |= flags & RSPD_GTS_MASK; | |
6195c71d | 2176 | handle_rsp_cntrl_info(qs, flags); |
4d22de3e DLR |
2177 | } |
2178 | ||
2179 | q->pure_rsps++; | |
2180 | if (++q->credits >= (q->size / 4)) { | |
2181 | refill_rspq(adap, q, q->credits); | |
2182 | q->credits = 0; | |
2183 | } | |
2184 | } while (is_new_response(r, q) && is_pure_response(r)); | |
2185 | ||
4d22de3e DLR |
2186 | if (sleeping) |
2187 | check_ring_db(adap, qs, sleeping); | |
2188 | ||
2189 | smp_mb(); /* commit Tx queue .processed updates */ | |
2190 | if (unlikely(qs->txq_stopped != 0)) | |
2191 | restart_tx(qs); | |
2192 | ||
2193 | return is_new_response(r, q); | |
2194 | } | |
2195 | ||
2196 | /** | |
2197 | * handle_responses - decide what to do with new responses in NAPI mode | |
2198 | * @adap: the adapter | |
2199 | * @q: the response queue | |
2200 | * | |
2201 | * This is used by the NAPI interrupt handlers to decide what to do with | |
2202 | * new SGE responses. If there are no new responses it returns -1. If | |
2203 | * there are new responses and they are pure (i.e., non-data carrying) | |
2204 | * it handles them straight in hard interrupt context as they are very | |
2205 | * cheap and don't deliver any packets. Finally, if there are any data | |
2206 | * signaling responses it schedules the NAPI handler. Returns 1 if it | |
2207 | * schedules NAPI, 0 if all new responses were pure. | |
2208 | * | |
2209 | * The caller must ascertain NAPI is not already running. | |
2210 | */ | |
2211 | static inline int handle_responses(struct adapter *adap, struct sge_rspq *q) | |
2212 | { | |
2213 | struct sge_qset *qs = rspq_to_qset(q); | |
2214 | struct rsp_desc *r = &q->desc[q->cidx]; | |
2215 | ||
2216 | if (!is_new_response(r, q)) | |
2217 | return -1; | |
2218 | if (is_pure_response(r) && process_pure_responses(adap, qs, r) == 0) { | |
2219 | t3_write_reg(adap, A_SG_GTS, V_RSPQ(q->cntxt_id) | | |
2220 | V_NEWTIMER(q->holdoff_tmr) | V_NEWINDEX(q->cidx)); | |
2221 | return 0; | |
2222 | } | |
bea3348e | 2223 | napi_schedule(&qs->napi); |
4d22de3e DLR |
2224 | return 1; |
2225 | } | |
2226 | ||
2227 | /* | |
2228 | * The MSI-X interrupt handler for an SGE response queue for the non-NAPI case | |
2229 | * (i.e., response queue serviced in hard interrupt). | |
2230 | */ | |
2231 | irqreturn_t t3_sge_intr_msix(int irq, void *cookie) | |
2232 | { | |
2233 | struct sge_qset *qs = cookie; | |
bea3348e | 2234 | struct adapter *adap = qs->adap; |
4d22de3e DLR |
2235 | struct sge_rspq *q = &qs->rspq; |
2236 | ||
2237 | spin_lock(&q->lock); | |
2238 | if (process_responses(adap, qs, -1) == 0) | |
2239 | q->unhandled_irqs++; | |
2240 | t3_write_reg(adap, A_SG_GTS, V_RSPQ(q->cntxt_id) | | |
2241 | V_NEWTIMER(q->next_holdoff) | V_NEWINDEX(q->cidx)); | |
2242 | spin_unlock(&q->lock); | |
2243 | return IRQ_HANDLED; | |
2244 | } | |
2245 | ||
2246 | /* | |
2247 | * The MSI-X interrupt handler for an SGE response queue for the NAPI case | |
2248 | * (i.e., response queue serviced by NAPI polling). | |
2249 | */ | |
9265fabf | 2250 | static irqreturn_t t3_sge_intr_msix_napi(int irq, void *cookie) |
4d22de3e DLR |
2251 | { |
2252 | struct sge_qset *qs = cookie; | |
4d22de3e DLR |
2253 | struct sge_rspq *q = &qs->rspq; |
2254 | ||
2255 | spin_lock(&q->lock); | |
4d22de3e | 2256 | |
bea3348e | 2257 | if (handle_responses(qs->adap, q) < 0) |
4d22de3e DLR |
2258 | q->unhandled_irqs++; |
2259 | spin_unlock(&q->lock); | |
2260 | return IRQ_HANDLED; | |
2261 | } | |
2262 | ||
2263 | /* | |
2264 | * The non-NAPI MSI interrupt handler. This needs to handle data events from | |
2265 | * SGE response queues as well as error and other async events as they all use | |
2266 | * the same MSI vector. We use one SGE response queue per port in this mode | |
2267 | * and protect all response queues with queue 0's lock. | |
2268 | */ | |
2269 | static irqreturn_t t3_intr_msi(int irq, void *cookie) | |
2270 | { | |
2271 | int new_packets = 0; | |
2272 | struct adapter *adap = cookie; | |
2273 | struct sge_rspq *q = &adap->sge.qs[0].rspq; | |
2274 | ||
2275 | spin_lock(&q->lock); | |
2276 | ||
2277 | if (process_responses(adap, &adap->sge.qs[0], -1)) { | |
2278 | t3_write_reg(adap, A_SG_GTS, V_RSPQ(q->cntxt_id) | | |
2279 | V_NEWTIMER(q->next_holdoff) | V_NEWINDEX(q->cidx)); | |
2280 | new_packets = 1; | |
2281 | } | |
2282 | ||
2283 | if (adap->params.nports == 2 && | |
2284 | process_responses(adap, &adap->sge.qs[1], -1)) { | |
2285 | struct sge_rspq *q1 = &adap->sge.qs[1].rspq; | |
2286 | ||
2287 | t3_write_reg(adap, A_SG_GTS, V_RSPQ(q1->cntxt_id) | | |
2288 | V_NEWTIMER(q1->next_holdoff) | | |
2289 | V_NEWINDEX(q1->cidx)); | |
2290 | new_packets = 1; | |
2291 | } | |
2292 | ||
2293 | if (!new_packets && t3_slow_intr_handler(adap) == 0) | |
2294 | q->unhandled_irqs++; | |
2295 | ||
2296 | spin_unlock(&q->lock); | |
2297 | return IRQ_HANDLED; | |
2298 | } | |
2299 | ||
bea3348e | 2300 | static int rspq_check_napi(struct sge_qset *qs) |
4d22de3e | 2301 | { |
bea3348e SH |
2302 | struct sge_rspq *q = &qs->rspq; |
2303 | ||
2304 | if (!napi_is_scheduled(&qs->napi) && | |
2305 | is_new_response(&q->desc[q->cidx], q)) { | |
2306 | napi_schedule(&qs->napi); | |
4d22de3e DLR |
2307 | return 1; |
2308 | } | |
2309 | return 0; | |
2310 | } | |
2311 | ||
2312 | /* | |
2313 | * The MSI interrupt handler for the NAPI case (i.e., response queues serviced | |
2314 | * by NAPI polling). Handles data events from SGE response queues as well as | |
2315 | * error and other async events as they all use the same MSI vector. We use | |
2316 | * one SGE response queue per port in this mode and protect all response | |
2317 | * queues with queue 0's lock. | |
2318 | */ | |
9265fabf | 2319 | static irqreturn_t t3_intr_msi_napi(int irq, void *cookie) |
4d22de3e DLR |
2320 | { |
2321 | int new_packets; | |
2322 | struct adapter *adap = cookie; | |
2323 | struct sge_rspq *q = &adap->sge.qs[0].rspq; | |
2324 | ||
2325 | spin_lock(&q->lock); | |
2326 | ||
bea3348e | 2327 | new_packets = rspq_check_napi(&adap->sge.qs[0]); |
4d22de3e | 2328 | if (adap->params.nports == 2) |
bea3348e | 2329 | new_packets += rspq_check_napi(&adap->sge.qs[1]); |
4d22de3e DLR |
2330 | if (!new_packets && t3_slow_intr_handler(adap) == 0) |
2331 | q->unhandled_irqs++; | |
2332 | ||
2333 | spin_unlock(&q->lock); | |
2334 | return IRQ_HANDLED; | |
2335 | } | |
2336 | ||
2337 | /* | |
2338 | * A helper function that processes responses and issues GTS. | |
2339 | */ | |
2340 | static inline int process_responses_gts(struct adapter *adap, | |
2341 | struct sge_rspq *rq) | |
2342 | { | |
2343 | int work; | |
2344 | ||
2345 | work = process_responses(adap, rspq_to_qset(rq), -1); | |
2346 | t3_write_reg(adap, A_SG_GTS, V_RSPQ(rq->cntxt_id) | | |
2347 | V_NEWTIMER(rq->next_holdoff) | V_NEWINDEX(rq->cidx)); | |
2348 | return work; | |
2349 | } | |
2350 | ||
2351 | /* | |
2352 | * The legacy INTx interrupt handler. This needs to handle data events from | |
2353 | * SGE response queues as well as error and other async events as they all use | |
2354 | * the same interrupt pin. We use one SGE response queue per port in this mode | |
2355 | * and protect all response queues with queue 0's lock. | |
2356 | */ | |
2357 | static irqreturn_t t3_intr(int irq, void *cookie) | |
2358 | { | |
2359 | int work_done, w0, w1; | |
2360 | struct adapter *adap = cookie; | |
2361 | struct sge_rspq *q0 = &adap->sge.qs[0].rspq; | |
2362 | struct sge_rspq *q1 = &adap->sge.qs[1].rspq; | |
2363 | ||
2364 | spin_lock(&q0->lock); | |
2365 | ||
2366 | w0 = is_new_response(&q0->desc[q0->cidx], q0); | |
2367 | w1 = adap->params.nports == 2 && | |
2368 | is_new_response(&q1->desc[q1->cidx], q1); | |
2369 | ||
2370 | if (likely(w0 | w1)) { | |
2371 | t3_write_reg(adap, A_PL_CLI, 0); | |
2372 | t3_read_reg(adap, A_PL_CLI); /* flush */ | |
2373 | ||
2374 | if (likely(w0)) | |
2375 | process_responses_gts(adap, q0); | |
2376 | ||
2377 | if (w1) | |
2378 | process_responses_gts(adap, q1); | |
2379 | ||
2380 | work_done = w0 | w1; | |
2381 | } else | |
2382 | work_done = t3_slow_intr_handler(adap); | |
2383 | ||
2384 | spin_unlock(&q0->lock); | |
2385 | return IRQ_RETVAL(work_done != 0); | |
2386 | } | |
2387 | ||
2388 | /* | |
2389 | * Interrupt handler for legacy INTx interrupts for T3B-based cards. | |
2390 | * Handles data events from SGE response queues as well as error and other | |
2391 | * async events as they all use the same interrupt pin. We use one SGE | |
2392 | * response queue per port in this mode and protect all response queues with | |
2393 | * queue 0's lock. | |
2394 | */ | |
2395 | static irqreturn_t t3b_intr(int irq, void *cookie) | |
2396 | { | |
2397 | u32 map; | |
2398 | struct adapter *adap = cookie; | |
2399 | struct sge_rspq *q0 = &adap->sge.qs[0].rspq; | |
2400 | ||
2401 | t3_write_reg(adap, A_PL_CLI, 0); | |
2402 | map = t3_read_reg(adap, A_SG_DATA_INTR); | |
2403 | ||
2404 | if (unlikely(!map)) /* shared interrupt, most likely */ | |
2405 | return IRQ_NONE; | |
2406 | ||
2407 | spin_lock(&q0->lock); | |
2408 | ||
2409 | if (unlikely(map & F_ERRINTR)) | |
2410 | t3_slow_intr_handler(adap); | |
2411 | ||
2412 | if (likely(map & 1)) | |
2413 | process_responses_gts(adap, q0); | |
2414 | ||
2415 | if (map & 2) | |
2416 | process_responses_gts(adap, &adap->sge.qs[1].rspq); | |
2417 | ||
2418 | spin_unlock(&q0->lock); | |
2419 | return IRQ_HANDLED; | |
2420 | } | |
2421 | ||
2422 | /* | |
2423 | * NAPI interrupt handler for legacy INTx interrupts for T3B-based cards. | |
2424 | * Handles data events from SGE response queues as well as error and other | |
2425 | * async events as they all use the same interrupt pin. We use one SGE | |
2426 | * response queue per port in this mode and protect all response queues with | |
2427 | * queue 0's lock. | |
2428 | */ | |
2429 | static irqreturn_t t3b_intr_napi(int irq, void *cookie) | |
2430 | { | |
2431 | u32 map; | |
4d22de3e | 2432 | struct adapter *adap = cookie; |
bea3348e SH |
2433 | struct sge_qset *qs0 = &adap->sge.qs[0]; |
2434 | struct sge_rspq *q0 = &qs0->rspq; | |
4d22de3e DLR |
2435 | |
2436 | t3_write_reg(adap, A_PL_CLI, 0); | |
2437 | map = t3_read_reg(adap, A_SG_DATA_INTR); | |
2438 | ||
2439 | if (unlikely(!map)) /* shared interrupt, most likely */ | |
2440 | return IRQ_NONE; | |
2441 | ||
2442 | spin_lock(&q0->lock); | |
2443 | ||
2444 | if (unlikely(map & F_ERRINTR)) | |
2445 | t3_slow_intr_handler(adap); | |
2446 | ||
bea3348e SH |
2447 | if (likely(map & 1)) |
2448 | napi_schedule(&qs0->napi); | |
4d22de3e | 2449 | |
bea3348e SH |
2450 | if (map & 2) |
2451 | napi_schedule(&adap->sge.qs[1].napi); | |
4d22de3e DLR |
2452 | |
2453 | spin_unlock(&q0->lock); | |
2454 | return IRQ_HANDLED; | |
2455 | } | |
2456 | ||
2457 | /** | |
2458 | * t3_intr_handler - select the top-level interrupt handler | |
2459 | * @adap: the adapter | |
2460 | * @polling: whether using NAPI to service response queues | |
2461 | * | |
2462 | * Selects the top-level interrupt handler based on the type of interrupts | |
2463 | * (MSI-X, MSI, or legacy) and whether NAPI will be used to service the | |
2464 | * response queues. | |
2465 | */ | |
7c239975 | 2466 | irq_handler_t t3_intr_handler(struct adapter *adap, int polling) |
4d22de3e DLR |
2467 | { |
2468 | if (adap->flags & USING_MSIX) | |
2469 | return polling ? t3_sge_intr_msix_napi : t3_sge_intr_msix; | |
2470 | if (adap->flags & USING_MSI) | |
2471 | return polling ? t3_intr_msi_napi : t3_intr_msi; | |
2472 | if (adap->params.rev > 0) | |
2473 | return polling ? t3b_intr_napi : t3b_intr; | |
2474 | return t3_intr; | |
2475 | } | |
2476 | ||
b881955b DLR |
2477 | #define SGE_PARERR (F_CPPARITYERROR | F_OCPARITYERROR | F_RCPARITYERROR | \ |
2478 | F_IRPARITYERROR | V_ITPARITYERROR(M_ITPARITYERROR) | \ | |
2479 | V_FLPARITYERROR(M_FLPARITYERROR) | F_LODRBPARITYERROR | \ | |
2480 | F_HIDRBPARITYERROR | F_LORCQPARITYERROR | \ | |
2481 | F_HIRCQPARITYERROR) | |
2482 | #define SGE_FRAMINGERR (F_UC_REQ_FRAMINGERROR | F_R_REQ_FRAMINGERROR) | |
2483 | #define SGE_FATALERR (SGE_PARERR | SGE_FRAMINGERR | F_RSPQCREDITOVERFOW | \ | |
2484 | F_RSPQDISABLED) | |
2485 | ||
4d22de3e DLR |
2486 | /** |
2487 | * t3_sge_err_intr_handler - SGE async event interrupt handler | |
2488 | * @adapter: the adapter | |
2489 | * | |
2490 | * Interrupt handler for SGE asynchronous (non-data) events. | |
2491 | */ | |
2492 | void t3_sge_err_intr_handler(struct adapter *adapter) | |
2493 | { | |
2494 | unsigned int v, status = t3_read_reg(adapter, A_SG_INT_CAUSE); | |
2495 | ||
b881955b DLR |
2496 | if (status & SGE_PARERR) |
2497 | CH_ALERT(adapter, "SGE parity error (0x%x)\n", | |
2498 | status & SGE_PARERR); | |
2499 | if (status & SGE_FRAMINGERR) | |
2500 | CH_ALERT(adapter, "SGE framing error (0x%x)\n", | |
2501 | status & SGE_FRAMINGERR); | |
2502 | ||
4d22de3e DLR |
2503 | if (status & F_RSPQCREDITOVERFOW) |
2504 | CH_ALERT(adapter, "SGE response queue credit overflow\n"); | |
2505 | ||
2506 | if (status & F_RSPQDISABLED) { | |
2507 | v = t3_read_reg(adapter, A_SG_RSPQ_FL_STATUS); | |
2508 | ||
2509 | CH_ALERT(adapter, | |
2510 | "packet delivered to disabled response queue " | |
2511 | "(0x%x)\n", (v >> S_RSPQ0DISABLED) & 0xff); | |
2512 | } | |
2513 | ||
6e3f03b7 DLR |
2514 | if (status & (F_HIPIODRBDROPERR | F_LOPIODRBDROPERR)) |
2515 | CH_ALERT(adapter, "SGE dropped %s priority doorbell\n", | |
2516 | status & F_HIPIODRBDROPERR ? "high" : "lo"); | |
2517 | ||
4d22de3e | 2518 | t3_write_reg(adapter, A_SG_INT_CAUSE, status); |
b881955b | 2519 | if (status & SGE_FATALERR) |
4d22de3e DLR |
2520 | t3_fatal_err(adapter); |
2521 | } | |
2522 | ||
2523 | /** | |
2524 | * sge_timer_cb - perform periodic maintenance of an SGE qset | |
2525 | * @data: the SGE queue set to maintain | |
2526 | * | |
2527 | * Runs periodically from a timer to perform maintenance of an SGE queue | |
2528 | * set. It performs two tasks: | |
2529 | * | |
2530 | * a) Cleans up any completed Tx descriptors that may still be pending. | |
2531 | * Normal descriptor cleanup happens when new packets are added to a Tx | |
2532 | * queue so this timer is relatively infrequent and does any cleanup only | |
2533 | * if the Tx queue has not seen any new packets in a while. We make a | |
2534 | * best effort attempt to reclaim descriptors, in that we don't wait | |
2535 | * around if we cannot get a queue's lock (which most likely is because | |
2536 | * someone else is queueing new packets and so will also handle the clean | |
2537 | * up). Since control queues use immediate data exclusively we don't | |
2538 | * bother cleaning them up here. | |
2539 | * | |
2540 | * b) Replenishes Rx queues that have run out due to memory shortage. | |
2541 | * Normally new Rx buffers are added when existing ones are consumed but | |
2542 | * when out of memory a queue can become empty. We try to add only a few | |
2543 | * buffers here, the queue will be replenished fully as these new buffers | |
2544 | * are used up if memory shortage has subsided. | |
2545 | */ | |
2546 | static void sge_timer_cb(unsigned long data) | |
2547 | { | |
2548 | spinlock_t *lock; | |
2549 | struct sge_qset *qs = (struct sge_qset *)data; | |
bea3348e | 2550 | struct adapter *adap = qs->adap; |
4d22de3e DLR |
2551 | |
2552 | if (spin_trylock(&qs->txq[TXQ_ETH].lock)) { | |
2553 | reclaim_completed_tx(adap, &qs->txq[TXQ_ETH]); | |
2554 | spin_unlock(&qs->txq[TXQ_ETH].lock); | |
2555 | } | |
2556 | if (spin_trylock(&qs->txq[TXQ_OFLD].lock)) { | |
2557 | reclaim_completed_tx(adap, &qs->txq[TXQ_OFLD]); | |
2558 | spin_unlock(&qs->txq[TXQ_OFLD].lock); | |
2559 | } | |
2560 | lock = (adap->flags & USING_MSIX) ? &qs->rspq.lock : | |
bea3348e | 2561 | &adap->sge.qs[0].rspq.lock; |
4d22de3e | 2562 | if (spin_trylock_irq(lock)) { |
bea3348e | 2563 | if (!napi_is_scheduled(&qs->napi)) { |
bae73f44 DLR |
2564 | u32 status = t3_read_reg(adap, A_SG_RSPQ_FL_STATUS); |
2565 | ||
4d22de3e DLR |
2566 | if (qs->fl[0].credits < qs->fl[0].size) |
2567 | __refill_fl(adap, &qs->fl[0]); | |
2568 | if (qs->fl[1].credits < qs->fl[1].size) | |
2569 | __refill_fl(adap, &qs->fl[1]); | |
bae73f44 DLR |
2570 | |
2571 | if (status & (1 << qs->rspq.cntxt_id)) { | |
2572 | qs->rspq.starved++; | |
2573 | if (qs->rspq.credits) { | |
2574 | refill_rspq(adap, &qs->rspq, 1); | |
2575 | qs->rspq.credits--; | |
2576 | qs->rspq.restarted++; | |
e0994eb1 | 2577 | t3_write_reg(adap, A_SG_RSPQ_FL_STATUS, |
bae73f44 DLR |
2578 | 1 << qs->rspq.cntxt_id); |
2579 | } | |
2580 | } | |
4d22de3e DLR |
2581 | } |
2582 | spin_unlock_irq(lock); | |
2583 | } | |
2584 | mod_timer(&qs->tx_reclaim_timer, jiffies + TX_RECLAIM_PERIOD); | |
2585 | } | |
2586 | ||
2587 | /** | |
2588 | * t3_update_qset_coalesce - update coalescing settings for a queue set | |
2589 | * @qs: the SGE queue set | |
2590 | * @p: new queue set parameters | |
2591 | * | |
2592 | * Update the coalescing settings for an SGE queue set. Nothing is done | |
2593 | * if the queue set is not initialized yet. | |
2594 | */ | |
2595 | void t3_update_qset_coalesce(struct sge_qset *qs, const struct qset_params *p) | |
2596 | { | |
4d22de3e DLR |
2597 | qs->rspq.holdoff_tmr = max(p->coalesce_usecs * 10, 1U);/* can't be 0 */ |
2598 | qs->rspq.polling = p->polling; | |
bea3348e | 2599 | qs->napi.poll = p->polling ? napi_rx_handler : ofld_poll; |
4d22de3e DLR |
2600 | } |
2601 | ||
2602 | /** | |
2603 | * t3_sge_alloc_qset - initialize an SGE queue set | |
2604 | * @adapter: the adapter | |
2605 | * @id: the queue set id | |
2606 | * @nports: how many Ethernet ports will be using this queue set | |
2607 | * @irq_vec_idx: the IRQ vector index for response queue interrupts | |
2608 | * @p: configuration parameters for this queue set | |
2609 | * @ntxq: number of Tx queues for the queue set | |
2610 | * @netdev: net device associated with this queue set | |
2611 | * | |
2612 | * Allocate resources and initialize an SGE queue set. A queue set | |
2613 | * comprises a response queue, two Rx free-buffer queues, and up to 3 | |
2614 | * Tx queues. The Tx queues are assigned roles in the order Ethernet | |
2615 | * queue, offload queue, and control queue. | |
2616 | */ | |
2617 | int t3_sge_alloc_qset(struct adapter *adapter, unsigned int id, int nports, | |
2618 | int irq_vec_idx, const struct qset_params *p, | |
bea3348e | 2619 | int ntxq, struct net_device *dev) |
4d22de3e DLR |
2620 | { |
2621 | int i, ret = -ENOMEM; | |
2622 | struct sge_qset *q = &adapter->sge.qs[id]; | |
2623 | ||
2624 | init_qset_cntxt(q, id); | |
2625 | init_timer(&q->tx_reclaim_timer); | |
2626 | q->tx_reclaim_timer.data = (unsigned long)q; | |
2627 | q->tx_reclaim_timer.function = sge_timer_cb; | |
2628 | ||
2629 | q->fl[0].desc = alloc_ring(adapter->pdev, p->fl_size, | |
2630 | sizeof(struct rx_desc), | |
2631 | sizeof(struct rx_sw_desc), | |
2632 | &q->fl[0].phys_addr, &q->fl[0].sdesc); | |
2633 | if (!q->fl[0].desc) | |
2634 | goto err; | |
2635 | ||
2636 | q->fl[1].desc = alloc_ring(adapter->pdev, p->jumbo_size, | |
2637 | sizeof(struct rx_desc), | |
2638 | sizeof(struct rx_sw_desc), | |
2639 | &q->fl[1].phys_addr, &q->fl[1].sdesc); | |
2640 | if (!q->fl[1].desc) | |
2641 | goto err; | |
2642 | ||
2643 | q->rspq.desc = alloc_ring(adapter->pdev, p->rspq_size, | |
2644 | sizeof(struct rsp_desc), 0, | |
2645 | &q->rspq.phys_addr, NULL); | |
2646 | if (!q->rspq.desc) | |
2647 | goto err; | |
2648 | ||
2649 | for (i = 0; i < ntxq; ++i) { | |
2650 | /* | |
2651 | * The control queue always uses immediate data so does not | |
2652 | * need to keep track of any sk_buffs. | |
2653 | */ | |
2654 | size_t sz = i == TXQ_CTRL ? 0 : sizeof(struct tx_sw_desc); | |
2655 | ||
2656 | q->txq[i].desc = alloc_ring(adapter->pdev, p->txq_size[i], | |
2657 | sizeof(struct tx_desc), sz, | |
2658 | &q->txq[i].phys_addr, | |
2659 | &q->txq[i].sdesc); | |
2660 | if (!q->txq[i].desc) | |
2661 | goto err; | |
2662 | ||
2663 | q->txq[i].gen = 1; | |
2664 | q->txq[i].size = p->txq_size[i]; | |
2665 | spin_lock_init(&q->txq[i].lock); | |
2666 | skb_queue_head_init(&q->txq[i].sendq); | |
2667 | } | |
2668 | ||
2669 | tasklet_init(&q->txq[TXQ_OFLD].qresume_tsk, restart_offloadq, | |
2670 | (unsigned long)q); | |
2671 | tasklet_init(&q->txq[TXQ_CTRL].qresume_tsk, restart_ctrlq, | |
2672 | (unsigned long)q); | |
2673 | ||
2674 | q->fl[0].gen = q->fl[1].gen = 1; | |
2675 | q->fl[0].size = p->fl_size; | |
2676 | q->fl[1].size = p->jumbo_size; | |
2677 | ||
2678 | q->rspq.gen = 1; | |
2679 | q->rspq.size = p->rspq_size; | |
2680 | spin_lock_init(&q->rspq.lock); | |
2681 | ||
2682 | q->txq[TXQ_ETH].stop_thres = nports * | |
2683 | flits_to_desc(sgl_len(MAX_SKB_FRAGS + 1) + 3); | |
2684 | ||
cf992af5 DLR |
2685 | #if FL0_PG_CHUNK_SIZE > 0 |
2686 | q->fl[0].buf_size = FL0_PG_CHUNK_SIZE; | |
e0994eb1 | 2687 | #else |
cf992af5 | 2688 | q->fl[0].buf_size = SGE_RX_SM_BUF_SIZE + sizeof(struct cpl_rx_data); |
e0994eb1 | 2689 | #endif |
cf992af5 DLR |
2690 | q->fl[0].use_pages = FL0_PG_CHUNK_SIZE > 0; |
2691 | q->fl[1].buf_size = is_offload(adapter) ? | |
2692 | (16 * 1024) - SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) : | |
2693 | MAX_FRAME_SIZE + 2 + sizeof(struct cpl_rx_pkt); | |
4d22de3e | 2694 | |
b1186dee | 2695 | spin_lock_irq(&adapter->sge.reg_lock); |
4d22de3e DLR |
2696 | |
2697 | /* FL threshold comparison uses < */ | |
2698 | ret = t3_sge_init_rspcntxt(adapter, q->rspq.cntxt_id, irq_vec_idx, | |
2699 | q->rspq.phys_addr, q->rspq.size, | |
2700 | q->fl[0].buf_size, 1, 0); | |
2701 | if (ret) | |
2702 | goto err_unlock; | |
2703 | ||
2704 | for (i = 0; i < SGE_RXQ_PER_SET; ++i) { | |
2705 | ret = t3_sge_init_flcntxt(adapter, q->fl[i].cntxt_id, 0, | |
2706 | q->fl[i].phys_addr, q->fl[i].size, | |
2707 | q->fl[i].buf_size, p->cong_thres, 1, | |
2708 | 0); | |
2709 | if (ret) | |
2710 | goto err_unlock; | |
2711 | } | |
2712 | ||
2713 | ret = t3_sge_init_ecntxt(adapter, q->txq[TXQ_ETH].cntxt_id, USE_GTS, | |
2714 | SGE_CNTXT_ETH, id, q->txq[TXQ_ETH].phys_addr, | |
2715 | q->txq[TXQ_ETH].size, q->txq[TXQ_ETH].token, | |
2716 | 1, 0); | |
2717 | if (ret) | |
2718 | goto err_unlock; | |
2719 | ||
2720 | if (ntxq > 1) { | |
2721 | ret = t3_sge_init_ecntxt(adapter, q->txq[TXQ_OFLD].cntxt_id, | |
2722 | USE_GTS, SGE_CNTXT_OFLD, id, | |
2723 | q->txq[TXQ_OFLD].phys_addr, | |
2724 | q->txq[TXQ_OFLD].size, 0, 1, 0); | |
2725 | if (ret) | |
2726 | goto err_unlock; | |
2727 | } | |
2728 | ||
2729 | if (ntxq > 2) { | |
2730 | ret = t3_sge_init_ecntxt(adapter, q->txq[TXQ_CTRL].cntxt_id, 0, | |
2731 | SGE_CNTXT_CTRL, id, | |
2732 | q->txq[TXQ_CTRL].phys_addr, | |
2733 | q->txq[TXQ_CTRL].size, | |
2734 | q->txq[TXQ_CTRL].token, 1, 0); | |
2735 | if (ret) | |
2736 | goto err_unlock; | |
2737 | } | |
2738 | ||
b1186dee | 2739 | spin_unlock_irq(&adapter->sge.reg_lock); |
4d22de3e | 2740 | |
bea3348e SH |
2741 | q->adap = adapter; |
2742 | q->netdev = dev; | |
2743 | t3_update_qset_coalesce(q, p); | |
4d22de3e DLR |
2744 | |
2745 | refill_fl(adapter, &q->fl[0], q->fl[0].size, GFP_KERNEL); | |
2746 | refill_fl(adapter, &q->fl[1], q->fl[1].size, GFP_KERNEL); | |
2747 | refill_rspq(adapter, &q->rspq, q->rspq.size - 1); | |
2748 | ||
2749 | t3_write_reg(adapter, A_SG_GTS, V_RSPQ(q->rspq.cntxt_id) | | |
2750 | V_NEWTIMER(q->rspq.holdoff_tmr)); | |
2751 | ||
2752 | mod_timer(&q->tx_reclaim_timer, jiffies + TX_RECLAIM_PERIOD); | |
2753 | return 0; | |
2754 | ||
2755 | err_unlock: | |
b1186dee | 2756 | spin_unlock_irq(&adapter->sge.reg_lock); |
4d22de3e DLR |
2757 | err: |
2758 | t3_free_qset(adapter, q); | |
2759 | return ret; | |
2760 | } | |
2761 | ||
2762 | /** | |
2763 | * t3_free_sge_resources - free SGE resources | |
2764 | * @adap: the adapter | |
2765 | * | |
2766 | * Frees resources used by the SGE queue sets. | |
2767 | */ | |
2768 | void t3_free_sge_resources(struct adapter *adap) | |
2769 | { | |
2770 | int i; | |
2771 | ||
2772 | for (i = 0; i < SGE_QSETS; ++i) | |
2773 | t3_free_qset(adap, &adap->sge.qs[i]); | |
2774 | } | |
2775 | ||
2776 | /** | |
2777 | * t3_sge_start - enable SGE | |
2778 | * @adap: the adapter | |
2779 | * | |
2780 | * Enables the SGE for DMAs. This is the last step in starting packet | |
2781 | * transfers. | |
2782 | */ | |
2783 | void t3_sge_start(struct adapter *adap) | |
2784 | { | |
2785 | t3_set_reg_field(adap, A_SG_CONTROL, F_GLOBALENABLE, F_GLOBALENABLE); | |
2786 | } | |
2787 | ||
2788 | /** | |
2789 | * t3_sge_stop - disable SGE operation | |
2790 | * @adap: the adapter | |
2791 | * | |
2792 | * Disables the DMA engine. This can be called in emeregencies (e.g., | |
2793 | * from error interrupts) or from normal process context. In the latter | |
2794 | * case it also disables any pending queue restart tasklets. Note that | |
2795 | * if it is called in interrupt context it cannot disable the restart | |
2796 | * tasklets as it cannot wait, however the tasklets will have no effect | |
2797 | * since the doorbells are disabled and the driver will call this again | |
2798 | * later from process context, at which time the tasklets will be stopped | |
2799 | * if they are still running. | |
2800 | */ | |
2801 | void t3_sge_stop(struct adapter *adap) | |
2802 | { | |
2803 | t3_set_reg_field(adap, A_SG_CONTROL, F_GLOBALENABLE, 0); | |
2804 | if (!in_interrupt()) { | |
2805 | int i; | |
2806 | ||
2807 | for (i = 0; i < SGE_QSETS; ++i) { | |
2808 | struct sge_qset *qs = &adap->sge.qs[i]; | |
2809 | ||
2810 | tasklet_kill(&qs->txq[TXQ_OFLD].qresume_tsk); | |
2811 | tasklet_kill(&qs->txq[TXQ_CTRL].qresume_tsk); | |
2812 | } | |
2813 | } | |
2814 | } | |
2815 | ||
2816 | /** | |
2817 | * t3_sge_init - initialize SGE | |
2818 | * @adap: the adapter | |
2819 | * @p: the SGE parameters | |
2820 | * | |
2821 | * Performs SGE initialization needed every time after a chip reset. | |
2822 | * We do not initialize any of the queue sets here, instead the driver | |
2823 | * top-level must request those individually. We also do not enable DMA | |
2824 | * here, that should be done after the queues have been set up. | |
2825 | */ | |
2826 | void t3_sge_init(struct adapter *adap, struct sge_params *p) | |
2827 | { | |
2828 | unsigned int ctrl, ups = ffs(pci_resource_len(adap->pdev, 2) >> 12); | |
2829 | ||
2830 | ctrl = F_DROPPKT | V_PKTSHIFT(2) | F_FLMODE | F_AVOIDCQOVFL | | |
b881955b | 2831 | F_CQCRDTCTRL | F_CONGMODE | F_TNLFLMODE | F_FATLPERREN | |
4d22de3e DLR |
2832 | V_HOSTPAGESIZE(PAGE_SHIFT - 11) | F_BIGENDIANINGRESS | |
2833 | V_USERSPACESIZE(ups ? ups - 1 : 0) | F_ISCSICOALESCING; | |
2834 | #if SGE_NUM_GENBITS == 1 | |
2835 | ctrl |= F_EGRGENCTRL; | |
2836 | #endif | |
2837 | if (adap->params.rev > 0) { | |
2838 | if (!(adap->flags & (USING_MSIX | USING_MSI))) | |
2839 | ctrl |= F_ONEINTMULTQ | F_OPTONEINTMULTQ; | |
4d22de3e DLR |
2840 | } |
2841 | t3_write_reg(adap, A_SG_CONTROL, ctrl); | |
2842 | t3_write_reg(adap, A_SG_EGR_RCQ_DRB_THRSH, V_HIRCQDRBTHRSH(512) | | |
2843 | V_LORCQDRBTHRSH(512)); | |
2844 | t3_write_reg(adap, A_SG_TIMER_TICK, core_ticks_per_usec(adap) / 10); | |
2845 | t3_write_reg(adap, A_SG_CMDQ_CREDIT_TH, V_THRESHOLD(32) | | |
6195c71d | 2846 | V_TIMEOUT(200 * core_ticks_per_usec(adap))); |
b881955b DLR |
2847 | t3_write_reg(adap, A_SG_HI_DRB_HI_THRSH, |
2848 | adap->params.rev < T3_REV_C ? 1000 : 500); | |
4d22de3e DLR |
2849 | t3_write_reg(adap, A_SG_HI_DRB_LO_THRSH, 256); |
2850 | t3_write_reg(adap, A_SG_LO_DRB_HI_THRSH, 1000); | |
2851 | t3_write_reg(adap, A_SG_LO_DRB_LO_THRSH, 256); | |
2852 | t3_write_reg(adap, A_SG_OCO_BASE, V_BASE1(0xfff)); | |
2853 | t3_write_reg(adap, A_SG_DRB_PRI_THRESH, 63 * 1024); | |
2854 | } | |
2855 | ||
2856 | /** | |
2857 | * t3_sge_prep - one-time SGE initialization | |
2858 | * @adap: the associated adapter | |
2859 | * @p: SGE parameters | |
2860 | * | |
2861 | * Performs one-time initialization of SGE SW state. Includes determining | |
2862 | * defaults for the assorted SGE parameters, which admins can change until | |
2863 | * they are used to initialize the SGE. | |
2864 | */ | |
7b9b0943 | 2865 | void t3_sge_prep(struct adapter *adap, struct sge_params *p) |
4d22de3e DLR |
2866 | { |
2867 | int i; | |
2868 | ||
2869 | p->max_pkt_size = (16 * 1024) - sizeof(struct cpl_rx_data) - | |
2870 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); | |
2871 | ||
2872 | for (i = 0; i < SGE_QSETS; ++i) { | |
2873 | struct qset_params *q = p->qset + i; | |
2874 | ||
2875 | q->polling = adap->params.rev > 0; | |
2876 | q->coalesce_usecs = 5; | |
2877 | q->rspq_size = 1024; | |
e0994eb1 | 2878 | q->fl_size = 1024; |
4d22de3e DLR |
2879 | q->jumbo_size = 512; |
2880 | q->txq_size[TXQ_ETH] = 1024; | |
2881 | q->txq_size[TXQ_OFLD] = 1024; | |
2882 | q->txq_size[TXQ_CTRL] = 256; | |
2883 | q->cong_thres = 0; | |
2884 | } | |
2885 | ||
2886 | spin_lock_init(&adap->sge.reg_lock); | |
2887 | } | |
2888 | ||
2889 | /** | |
2890 | * t3_get_desc - dump an SGE descriptor for debugging purposes | |
2891 | * @qs: the queue set | |
2892 | * @qnum: identifies the specific queue (0..2: Tx, 3:response, 4..5: Rx) | |
2893 | * @idx: the descriptor index in the queue | |
2894 | * @data: where to dump the descriptor contents | |
2895 | * | |
2896 | * Dumps the contents of a HW descriptor of an SGE queue. Returns the | |
2897 | * size of the descriptor. | |
2898 | */ | |
2899 | int t3_get_desc(const struct sge_qset *qs, unsigned int qnum, unsigned int idx, | |
2900 | unsigned char *data) | |
2901 | { | |
2902 | if (qnum >= 6) | |
2903 | return -EINVAL; | |
2904 | ||
2905 | if (qnum < 3) { | |
2906 | if (!qs->txq[qnum].desc || idx >= qs->txq[qnum].size) | |
2907 | return -EINVAL; | |
2908 | memcpy(data, &qs->txq[qnum].desc[idx], sizeof(struct tx_desc)); | |
2909 | return sizeof(struct tx_desc); | |
2910 | } | |
2911 | ||
2912 | if (qnum == 3) { | |
2913 | if (!qs->rspq.desc || idx >= qs->rspq.size) | |
2914 | return -EINVAL; | |
2915 | memcpy(data, &qs->rspq.desc[idx], sizeof(struct rsp_desc)); | |
2916 | return sizeof(struct rsp_desc); | |
2917 | } | |
2918 | ||
2919 | qnum -= 4; | |
2920 | if (!qs->fl[qnum].desc || idx >= qs->fl[qnum].size) | |
2921 | return -EINVAL; | |
2922 | memcpy(data, &qs->fl[qnum].desc[idx], sizeof(struct rx_desc)); | |
2923 | return sizeof(struct rx_desc); | |
2924 | } |