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ec34a922 RD |
1 | /* |
2 | * Copyright (c) 2005 Cisco Systems. All rights reserved. | |
3 | * | |
4 | * This software is available to you under a choice of one of two | |
5 | * licenses. You may choose to be licensed under the terms of the GNU | |
6 | * General Public License (GPL) Version 2, available from the file | |
7 | * COPYING in the main directory of this source tree, or the | |
8 | * OpenIB.org BSD license below: | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or | |
11 | * without modification, are permitted provided that the following | |
12 | * conditions are met: | |
13 | * | |
14 | * - Redistributions of source code must retain the above | |
15 | * copyright notice, this list of conditions and the following | |
16 | * disclaimer. | |
17 | * | |
18 | * - Redistributions in binary form must reproduce the above | |
19 | * copyright notice, this list of conditions and the following | |
20 | * disclaimer in the documentation and/or other materials | |
21 | * provided with the distribution. | |
22 | * | |
23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
24 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
25 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
26 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
27 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
28 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
29 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
30 | * SOFTWARE. | |
31 | * | |
32 | * $Id: mthca_srq.c 3047 2005-08-10 03:59:35Z roland $ | |
33 | */ | |
34 | ||
8c65b4a6 TS |
35 | #include <linux/slab.h> |
36 | #include <linux/string.h> | |
37 | ||
1f5c23e2 AK |
38 | #include <asm/io.h> |
39 | ||
ec34a922 RD |
40 | #include "mthca_dev.h" |
41 | #include "mthca_cmd.h" | |
42 | #include "mthca_memfree.h" | |
43 | #include "mthca_wqe.h" | |
44 | ||
45 | enum { | |
46 | MTHCA_MAX_DIRECT_SRQ_SIZE = 4 * PAGE_SIZE | |
47 | }; | |
48 | ||
49 | struct mthca_tavor_srq_context { | |
50 | __be64 wqe_base_ds; /* low 6 bits is descriptor size */ | |
51 | __be32 state_pd; | |
52 | __be32 lkey; | |
53 | __be32 uar; | |
fd02e803 EC |
54 | __be16 limit_watermark; |
55 | __be16 wqe_cnt; | |
ec34a922 RD |
56 | u32 reserved[2]; |
57 | }; | |
58 | ||
59 | struct mthca_arbel_srq_context { | |
60 | __be32 state_logsize_srqn; | |
61 | __be32 lkey; | |
62 | __be32 db_index; | |
63 | __be32 logstride_usrpage; | |
64 | __be64 wqe_base; | |
65 | __be32 eq_pd; | |
66 | __be16 limit_watermark; | |
67 | __be16 wqe_cnt; | |
68 | u16 reserved1; | |
69 | __be16 wqe_counter; | |
70 | u32 reserved2[3]; | |
71 | }; | |
72 | ||
73 | static void *get_wqe(struct mthca_srq *srq, int n) | |
74 | { | |
75 | if (srq->is_direct) | |
76 | return srq->queue.direct.buf + (n << srq->wqe_shift); | |
77 | else | |
78 | return srq->queue.page_list[(n << srq->wqe_shift) >> PAGE_SHIFT].buf + | |
79 | ((n << srq->wqe_shift) & (PAGE_SIZE - 1)); | |
80 | } | |
81 | ||
82 | /* | |
83 | * Return a pointer to the location within a WQE that we're using as a | |
e5b251a2 RD |
84 | * link when the WQE is in the free list. We use the imm field |
85 | * because in the Tavor case, posting a WQE may overwrite the next | |
86 | * segment of the previous WQE, but a receive WQE will never touch the | |
87 | * imm field. This avoids corrupting our free list if the previous | |
88 | * WQE has already completed and been put on the free list when we | |
89 | * post the next WQE. | |
ec34a922 RD |
90 | */ |
91 | static inline int *wqe_to_link(void *wqe) | |
92 | { | |
e5b251a2 | 93 | return (int *) (wqe + offsetof(struct mthca_next_seg, imm)); |
ec34a922 RD |
94 | } |
95 | ||
96 | static void mthca_tavor_init_srq_context(struct mthca_dev *dev, | |
97 | struct mthca_pd *pd, | |
98 | struct mthca_srq *srq, | |
99 | struct mthca_tavor_srq_context *context) | |
100 | { | |
101 | memset(context, 0, sizeof *context); | |
102 | ||
103 | context->wqe_base_ds = cpu_to_be64(1 << (srq->wqe_shift - 4)); | |
104 | context->state_pd = cpu_to_be32(pd->pd_num); | |
105 | context->lkey = cpu_to_be32(srq->mr.ibmr.lkey); | |
106 | ||
107 | if (pd->ibpd.uobject) | |
108 | context->uar = | |
109 | cpu_to_be32(to_mucontext(pd->ibpd.uobject->context)->uar.index); | |
110 | else | |
111 | context->uar = cpu_to_be32(dev->driver_uar.index); | |
112 | } | |
113 | ||
114 | static void mthca_arbel_init_srq_context(struct mthca_dev *dev, | |
115 | struct mthca_pd *pd, | |
116 | struct mthca_srq *srq, | |
117 | struct mthca_arbel_srq_context *context) | |
118 | { | |
119 | int logsize; | |
120 | ||
121 | memset(context, 0, sizeof *context); | |
122 | ||
7013696a | 123 | logsize = long_log2(srq->max); |
ec34a922 RD |
124 | context->state_logsize_srqn = cpu_to_be32(logsize << 24 | srq->srqn); |
125 | context->lkey = cpu_to_be32(srq->mr.ibmr.lkey); | |
126 | context->db_index = cpu_to_be32(srq->db_index); | |
127 | context->logstride_usrpage = cpu_to_be32((srq->wqe_shift - 4) << 29); | |
128 | if (pd->ibpd.uobject) | |
129 | context->logstride_usrpage |= | |
130 | cpu_to_be32(to_mucontext(pd->ibpd.uobject->context)->uar.index); | |
131 | else | |
132 | context->logstride_usrpage |= cpu_to_be32(dev->driver_uar.index); | |
133 | context->eq_pd = cpu_to_be32(MTHCA_EQ_ASYNC << 24 | pd->pd_num); | |
134 | } | |
135 | ||
136 | static void mthca_free_srq_buf(struct mthca_dev *dev, struct mthca_srq *srq) | |
137 | { | |
138 | mthca_buf_free(dev, srq->max << srq->wqe_shift, &srq->queue, | |
139 | srq->is_direct, &srq->mr); | |
140 | kfree(srq->wrid); | |
141 | } | |
142 | ||
143 | static int mthca_alloc_srq_buf(struct mthca_dev *dev, struct mthca_pd *pd, | |
144 | struct mthca_srq *srq) | |
145 | { | |
146 | struct mthca_data_seg *scatter; | |
147 | void *wqe; | |
148 | int err; | |
149 | int i; | |
150 | ||
151 | if (pd->ibpd.uobject) | |
152 | return 0; | |
153 | ||
154 | srq->wrid = kmalloc(srq->max * sizeof (u64), GFP_KERNEL); | |
155 | if (!srq->wrid) | |
156 | return -ENOMEM; | |
157 | ||
158 | err = mthca_buf_alloc(dev, srq->max << srq->wqe_shift, | |
159 | MTHCA_MAX_DIRECT_SRQ_SIZE, | |
160 | &srq->queue, &srq->is_direct, pd, 1, &srq->mr); | |
161 | if (err) { | |
162 | kfree(srq->wrid); | |
163 | return err; | |
164 | } | |
165 | ||
166 | /* | |
167 | * Now initialize the SRQ buffer so that all of the WQEs are | |
168 | * linked into the list of free WQEs. In addition, set the | |
169 | * scatter list L_Keys to the sentry value of 0x100. | |
170 | */ | |
171 | for (i = 0; i < srq->max; ++i) { | |
172 | wqe = get_wqe(srq, i); | |
173 | ||
174 | *wqe_to_link(wqe) = i < srq->max - 1 ? i + 1 : -1; | |
175 | ||
176 | for (scatter = wqe + sizeof (struct mthca_next_seg); | |
177 | (void *) scatter < wqe + (1 << srq->wqe_shift); | |
178 | ++scatter) | |
179 | scatter->lkey = cpu_to_be32(MTHCA_INVAL_LKEY); | |
180 | } | |
181 | ||
6577ae51 RD |
182 | srq->last = get_wqe(srq, srq->max - 1); |
183 | ||
ec34a922 RD |
184 | return 0; |
185 | } | |
186 | ||
187 | int mthca_alloc_srq(struct mthca_dev *dev, struct mthca_pd *pd, | |
188 | struct ib_srq_attr *attr, struct mthca_srq *srq) | |
189 | { | |
190 | struct mthca_mailbox *mailbox; | |
191 | u8 status; | |
192 | int ds; | |
193 | int err; | |
194 | ||
195 | /* Sanity check SRQ size before proceeding */ | |
efaae8f7 | 196 | if (attr->max_wr > dev->limits.max_srq_wqes || |
59fef3b1 | 197 | attr->max_sge > dev->limits.max_srq_sge) |
ec34a922 RD |
198 | return -EINVAL; |
199 | ||
200 | srq->max = attr->max_wr; | |
201 | srq->max_gs = attr->max_sge; | |
ec34a922 RD |
202 | srq->counter = 0; |
203 | ||
204 | if (mthca_is_memfree(dev)) | |
205 | srq->max = roundup_pow_of_two(srq->max + 1); | |
2cbe19d4 MT |
206 | else |
207 | srq->max = srq->max + 1; | |
ec34a922 | 208 | |
1d7d2f6f | 209 | ds = max(64UL, |
ec34a922 RD |
210 | roundup_pow_of_two(sizeof (struct mthca_next_seg) + |
211 | srq->max_gs * sizeof (struct mthca_data_seg))); | |
ded9ad72 | 212 | |
a07bacca | 213 | if (!mthca_is_memfree(dev) && (ds > dev->limits.max_desc_sz)) |
ded9ad72 JM |
214 | return -EINVAL; |
215 | ||
ec34a922 RD |
216 | srq->wqe_shift = long_log2(ds); |
217 | ||
218 | srq->srqn = mthca_alloc(&dev->srq_table.alloc); | |
219 | if (srq->srqn == -1) | |
220 | return -ENOMEM; | |
221 | ||
222 | if (mthca_is_memfree(dev)) { | |
223 | err = mthca_table_get(dev, dev->srq_table.table, srq->srqn); | |
224 | if (err) | |
225 | goto err_out; | |
226 | ||
227 | if (!pd->ibpd.uobject) { | |
228 | srq->db_index = mthca_alloc_db(dev, MTHCA_DB_TYPE_SRQ, | |
229 | srq->srqn, &srq->db); | |
230 | if (srq->db_index < 0) { | |
231 | err = -ENOMEM; | |
232 | goto err_out_icm; | |
233 | } | |
234 | } | |
235 | } | |
236 | ||
237 | mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL); | |
238 | if (IS_ERR(mailbox)) { | |
239 | err = PTR_ERR(mailbox); | |
240 | goto err_out_db; | |
241 | } | |
242 | ||
243 | err = mthca_alloc_srq_buf(dev, pd, srq); | |
244 | if (err) | |
245 | goto err_out_mailbox; | |
246 | ||
247 | spin_lock_init(&srq->lock); | |
a3285aa4 | 248 | srq->refcount = 1; |
ec34a922 | 249 | init_waitqueue_head(&srq->wait); |
c93b6fba | 250 | mutex_init(&srq->mutex); |
ec34a922 RD |
251 | |
252 | if (mthca_is_memfree(dev)) | |
253 | mthca_arbel_init_srq_context(dev, pd, srq, mailbox->buf); | |
254 | else | |
255 | mthca_tavor_init_srq_context(dev, pd, srq, mailbox->buf); | |
256 | ||
257 | err = mthca_SW2HW_SRQ(dev, mailbox, srq->srqn, &status); | |
258 | ||
259 | if (err) { | |
260 | mthca_warn(dev, "SW2HW_SRQ failed (%d)\n", err); | |
261 | goto err_out_free_buf; | |
262 | } | |
263 | if (status) { | |
264 | mthca_warn(dev, "SW2HW_SRQ returned status 0x%02x\n", | |
265 | status); | |
266 | err = -EINVAL; | |
267 | goto err_out_free_buf; | |
268 | } | |
269 | ||
270 | spin_lock_irq(&dev->srq_table.lock); | |
271 | if (mthca_array_set(&dev->srq_table.srq, | |
272 | srq->srqn & (dev->limits.num_srqs - 1), | |
273 | srq)) { | |
274 | spin_unlock_irq(&dev->srq_table.lock); | |
275 | goto err_out_free_srq; | |
276 | } | |
277 | spin_unlock_irq(&dev->srq_table.lock); | |
278 | ||
279 | mthca_free_mailbox(dev, mailbox); | |
280 | ||
281 | srq->first_free = 0; | |
282 | srq->last_free = srq->max - 1; | |
283 | ||
2cbe19d4 | 284 | attr->max_wr = srq->max - 1; |
abb6e9ba DB |
285 | attr->max_sge = srq->max_gs; |
286 | ||
ec34a922 RD |
287 | return 0; |
288 | ||
289 | err_out_free_srq: | |
290 | err = mthca_HW2SW_SRQ(dev, mailbox, srq->srqn, &status); | |
291 | if (err) | |
292 | mthca_warn(dev, "HW2SW_SRQ failed (%d)\n", err); | |
293 | else if (status) | |
294 | mthca_warn(dev, "HW2SW_SRQ returned status 0x%02x\n", status); | |
295 | ||
296 | err_out_free_buf: | |
297 | if (!pd->ibpd.uobject) | |
298 | mthca_free_srq_buf(dev, srq); | |
299 | ||
300 | err_out_mailbox: | |
301 | mthca_free_mailbox(dev, mailbox); | |
302 | ||
303 | err_out_db: | |
304 | if (!pd->ibpd.uobject && mthca_is_memfree(dev)) | |
305 | mthca_free_db(dev, MTHCA_DB_TYPE_SRQ, srq->db_index); | |
306 | ||
307 | err_out_icm: | |
308 | mthca_table_put(dev, dev->srq_table.table, srq->srqn); | |
309 | ||
310 | err_out: | |
311 | mthca_free(&dev->srq_table.alloc, srq->srqn); | |
312 | ||
313 | return err; | |
314 | } | |
315 | ||
a3285aa4 RD |
316 | static inline int get_srq_refcount(struct mthca_dev *dev, struct mthca_srq *srq) |
317 | { | |
318 | int c; | |
319 | ||
320 | spin_lock_irq(&dev->srq_table.lock); | |
321 | c = srq->refcount; | |
322 | spin_unlock_irq(&dev->srq_table.lock); | |
323 | ||
324 | return c; | |
325 | } | |
326 | ||
ec34a922 RD |
327 | void mthca_free_srq(struct mthca_dev *dev, struct mthca_srq *srq) |
328 | { | |
329 | struct mthca_mailbox *mailbox; | |
330 | int err; | |
331 | u8 status; | |
332 | ||
333 | mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL); | |
334 | if (IS_ERR(mailbox)) { | |
335 | mthca_warn(dev, "No memory for mailbox to free SRQ.\n"); | |
336 | return; | |
337 | } | |
338 | ||
339 | err = mthca_HW2SW_SRQ(dev, mailbox, srq->srqn, &status); | |
340 | if (err) | |
341 | mthca_warn(dev, "HW2SW_SRQ failed (%d)\n", err); | |
342 | else if (status) | |
343 | mthca_warn(dev, "HW2SW_SRQ returned status 0x%02x\n", status); | |
344 | ||
345 | spin_lock_irq(&dev->srq_table.lock); | |
346 | mthca_array_clear(&dev->srq_table.srq, | |
347 | srq->srqn & (dev->limits.num_srqs - 1)); | |
a3285aa4 | 348 | --srq->refcount; |
ec34a922 RD |
349 | spin_unlock_irq(&dev->srq_table.lock); |
350 | ||
a3285aa4 | 351 | wait_event(srq->wait, !get_srq_refcount(dev, srq)); |
ec34a922 RD |
352 | |
353 | if (!srq->ibsrq.uobject) { | |
354 | mthca_free_srq_buf(dev, srq); | |
355 | if (mthca_is_memfree(dev)) | |
356 | mthca_free_db(dev, MTHCA_DB_TYPE_SRQ, srq->db_index); | |
357 | } | |
358 | ||
359 | mthca_table_put(dev, dev->srq_table.table, srq->srqn); | |
360 | mthca_free(&dev->srq_table.alloc, srq->srqn); | |
361 | mthca_free_mailbox(dev, mailbox); | |
362 | } | |
363 | ||
90f104da | 364 | int mthca_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr, |
9bc57e2d | 365 | enum ib_srq_attr_mask attr_mask, struct ib_udata *udata) |
2fa5e2eb | 366 | { |
90f104da RD |
367 | struct mthca_dev *dev = to_mdev(ibsrq->device); |
368 | struct mthca_srq *srq = to_msrq(ibsrq); | |
369 | int ret; | |
370 | u8 status; | |
371 | ||
372 | /* We don't support resizing SRQs (yet?) */ | |
373 | if (attr_mask & IB_SRQ_MAX_WR) | |
374 | return -EINVAL; | |
375 | ||
376 | if (attr_mask & IB_SRQ_LIMIT) { | |
1252c517 DB |
377 | u32 max_wr = mthca_is_memfree(dev) ? srq->max - 1 : srq->max; |
378 | if (attr->srq_limit > max_wr) | |
d4301e2c | 379 | return -EINVAL; |
c93b6fba RD |
380 | |
381 | mutex_lock(&srq->mutex); | |
90f104da | 382 | ret = mthca_ARM_SRQ(dev, srq->srqn, attr->srq_limit, &status); |
c93b6fba RD |
383 | mutex_unlock(&srq->mutex); |
384 | ||
90f104da RD |
385 | if (ret) |
386 | return ret; | |
387 | if (status) | |
388 | return -EINVAL; | |
389 | } | |
390 | ||
391 | return 0; | |
392 | } | |
393 | ||
8ebe5077 EC |
394 | int mthca_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr) |
395 | { | |
396 | struct mthca_dev *dev = to_mdev(ibsrq->device); | |
397 | struct mthca_srq *srq = to_msrq(ibsrq); | |
398 | struct mthca_mailbox *mailbox; | |
399 | struct mthca_arbel_srq_context *arbel_ctx; | |
fd02e803 | 400 | struct mthca_tavor_srq_context *tavor_ctx; |
8ebe5077 EC |
401 | u8 status; |
402 | int err; | |
403 | ||
404 | mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL); | |
405 | if (IS_ERR(mailbox)) | |
406 | return PTR_ERR(mailbox); | |
407 | ||
408 | err = mthca_QUERY_SRQ(dev, srq->srqn, mailbox, &status); | |
409 | if (err) | |
410 | goto out; | |
411 | ||
412 | if (mthca_is_memfree(dev)) { | |
413 | arbel_ctx = mailbox->buf; | |
fd02e803 EC |
414 | srq_attr->srq_limit = be16_to_cpu(arbel_ctx->limit_watermark); |
415 | } else { | |
416 | tavor_ctx = mailbox->buf; | |
417 | srq_attr->srq_limit = be16_to_cpu(tavor_ctx->limit_watermark); | |
418 | } | |
8ebe5077 | 419 | |
2cbe19d4 | 420 | srq_attr->max_wr = srq->max - 1; |
8ebe5077 EC |
421 | srq_attr->max_sge = srq->max_gs; |
422 | ||
423 | out: | |
424 | mthca_free_mailbox(dev, mailbox); | |
425 | ||
426 | return err; | |
427 | } | |
428 | ||
ec34a922 RD |
429 | void mthca_srq_event(struct mthca_dev *dev, u32 srqn, |
430 | enum ib_event_type event_type) | |
431 | { | |
432 | struct mthca_srq *srq; | |
433 | struct ib_event event; | |
434 | ||
435 | spin_lock(&dev->srq_table.lock); | |
436 | srq = mthca_array_get(&dev->srq_table.srq, srqn & (dev->limits.num_srqs - 1)); | |
437 | if (srq) | |
a3285aa4 | 438 | ++srq->refcount; |
ec34a922 RD |
439 | spin_unlock(&dev->srq_table.lock); |
440 | ||
441 | if (!srq) { | |
442 | mthca_warn(dev, "Async event for bogus SRQ %08x\n", srqn); | |
443 | return; | |
444 | } | |
445 | ||
446 | if (!srq->ibsrq.event_handler) | |
447 | goto out; | |
448 | ||
449 | event.device = &dev->ib_dev; | |
450 | event.event = event_type; | |
90f104da | 451 | event.element.srq = &srq->ibsrq; |
ec34a922 RD |
452 | srq->ibsrq.event_handler(&event, srq->ibsrq.srq_context); |
453 | ||
454 | out: | |
a3285aa4 RD |
455 | spin_lock(&dev->srq_table.lock); |
456 | if (!--srq->refcount) | |
ec34a922 | 457 | wake_up(&srq->wait); |
a3285aa4 | 458 | spin_unlock(&dev->srq_table.lock); |
ec34a922 RD |
459 | } |
460 | ||
461 | /* | |
462 | * This function must be called with IRQs disabled. | |
463 | */ | |
464 | void mthca_free_srq_wqe(struct mthca_srq *srq, u32 wqe_addr) | |
465 | { | |
466 | int ind; | |
467 | ||
468 | ind = wqe_addr >> srq->wqe_shift; | |
469 | ||
470 | spin_lock(&srq->lock); | |
471 | ||
472 | if (likely(srq->first_free >= 0)) | |
473 | *wqe_to_link(get_wqe(srq, srq->last_free)) = ind; | |
474 | else | |
475 | srq->first_free = ind; | |
476 | ||
477 | *wqe_to_link(get_wqe(srq, ind)) = -1; | |
478 | srq->last_free = ind; | |
479 | ||
480 | spin_unlock(&srq->lock); | |
481 | } | |
482 | ||
483 | int mthca_tavor_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr, | |
484 | struct ib_recv_wr **bad_wr) | |
485 | { | |
486 | struct mthca_dev *dev = to_mdev(ibsrq->device); | |
487 | struct mthca_srq *srq = to_msrq(ibsrq); | |
ae57e24a | 488 | __be32 doorbell[2]; |
ec34a922 RD |
489 | unsigned long flags; |
490 | int err = 0; | |
491 | int first_ind; | |
492 | int ind; | |
493 | int next_ind; | |
494 | int nreq; | |
495 | int i; | |
496 | void *wqe; | |
497 | void *prev_wqe; | |
498 | ||
499 | spin_lock_irqsave(&srq->lock, flags); | |
500 | ||
501 | first_ind = srq->first_free; | |
502 | ||
ab28b171 | 503 | for (nreq = 0; wr; wr = wr->next) { |
ec34a922 RD |
504 | ind = srq->first_free; |
505 | ||
506 | if (ind < 0) { | |
507 | mthca_err(dev, "SRQ %06x full\n", srq->srqn); | |
508 | err = -ENOMEM; | |
509 | *bad_wr = wr; | |
3853194c | 510 | break; |
ec34a922 RD |
511 | } |
512 | ||
513 | wqe = get_wqe(srq, ind); | |
514 | next_ind = *wqe_to_link(wqe); | |
e23d6d2b RD |
515 | |
516 | if (next_ind < 0) { | |
517 | mthca_err(dev, "SRQ %06x full\n", srq->srqn); | |
518 | err = -ENOMEM; | |
519 | *bad_wr = wr; | |
520 | break; | |
521 | } | |
522 | ||
ec34a922 RD |
523 | prev_wqe = srq->last; |
524 | srq->last = wqe; | |
525 | ||
526 | ((struct mthca_next_seg *) wqe)->nda_op = 0; | |
527 | ((struct mthca_next_seg *) wqe)->ee_nds = 0; | |
528 | /* flags field will always remain 0 */ | |
529 | ||
530 | wqe += sizeof (struct mthca_next_seg); | |
531 | ||
532 | if (unlikely(wr->num_sge > srq->max_gs)) { | |
533 | err = -EINVAL; | |
534 | *bad_wr = wr; | |
535 | srq->last = prev_wqe; | |
3853194c | 536 | break; |
ec34a922 RD |
537 | } |
538 | ||
539 | for (i = 0; i < wr->num_sge; ++i) { | |
540 | ((struct mthca_data_seg *) wqe)->byte_count = | |
541 | cpu_to_be32(wr->sg_list[i].length); | |
542 | ((struct mthca_data_seg *) wqe)->lkey = | |
543 | cpu_to_be32(wr->sg_list[i].lkey); | |
544 | ((struct mthca_data_seg *) wqe)->addr = | |
545 | cpu_to_be64(wr->sg_list[i].addr); | |
546 | wqe += sizeof (struct mthca_data_seg); | |
547 | } | |
548 | ||
549 | if (i < srq->max_gs) { | |
550 | ((struct mthca_data_seg *) wqe)->byte_count = 0; | |
551 | ((struct mthca_data_seg *) wqe)->lkey = cpu_to_be32(MTHCA_INVAL_LKEY); | |
552 | ((struct mthca_data_seg *) wqe)->addr = 0; | |
553 | } | |
554 | ||
d6cff021 RD |
555 | ((struct mthca_next_seg *) prev_wqe)->nda_op = |
556 | cpu_to_be32((ind << srq->wqe_shift) | 1); | |
557 | wmb(); | |
558 | ((struct mthca_next_seg *) prev_wqe)->ee_nds = | |
559 | cpu_to_be32(MTHCA_NEXT_DBD); | |
ec34a922 RD |
560 | |
561 | srq->wrid[ind] = wr->wr_id; | |
562 | srq->first_free = next_ind; | |
ab28b171 MT |
563 | |
564 | ++nreq; | |
565 | if (unlikely(nreq == MTHCA_TAVOR_MAX_WQES_PER_RECV_DB)) { | |
566 | nreq = 0; | |
567 | ||
568 | doorbell[0] = cpu_to_be32(first_ind << srq->wqe_shift); | |
569 | doorbell[1] = cpu_to_be32(srq->srqn << 8); | |
570 | ||
571 | /* | |
572 | * Make sure that descriptors are written | |
573 | * before doorbell is rung. | |
574 | */ | |
575 | wmb(); | |
576 | ||
577 | mthca_write64(doorbell, | |
578 | dev->kar + MTHCA_RECEIVE_DOORBELL, | |
579 | MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock)); | |
580 | ||
581 | first_ind = srq->first_free; | |
582 | } | |
ec34a922 RD |
583 | } |
584 | ||
ec34a922 | 585 | if (likely(nreq)) { |
ec34a922 RD |
586 | doorbell[0] = cpu_to_be32(first_ind << srq->wqe_shift); |
587 | doorbell[1] = cpu_to_be32((srq->srqn << 8) | nreq); | |
588 | ||
589 | /* | |
590 | * Make sure that descriptors are written before | |
591 | * doorbell is rung. | |
592 | */ | |
593 | wmb(); | |
594 | ||
595 | mthca_write64(doorbell, | |
596 | dev->kar + MTHCA_RECEIVE_DOORBELL, | |
597 | MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock)); | |
598 | } | |
599 | ||
1f5c23e2 AK |
600 | /* |
601 | * Make sure doorbells don't leak out of SRQ spinlock and | |
602 | * reach the HCA out of order: | |
603 | */ | |
604 | mmiowb(); | |
605 | ||
ec34a922 RD |
606 | spin_unlock_irqrestore(&srq->lock, flags); |
607 | return err; | |
608 | } | |
609 | ||
610 | int mthca_arbel_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr, | |
611 | struct ib_recv_wr **bad_wr) | |
612 | { | |
613 | struct mthca_dev *dev = to_mdev(ibsrq->device); | |
614 | struct mthca_srq *srq = to_msrq(ibsrq); | |
615 | unsigned long flags; | |
616 | int err = 0; | |
617 | int ind; | |
618 | int next_ind; | |
619 | int nreq; | |
620 | int i; | |
621 | void *wqe; | |
622 | ||
623 | spin_lock_irqsave(&srq->lock, flags); | |
624 | ||
625 | for (nreq = 0; wr; ++nreq, wr = wr->next) { | |
626 | ind = srq->first_free; | |
627 | ||
628 | if (ind < 0) { | |
629 | mthca_err(dev, "SRQ %06x full\n", srq->srqn); | |
630 | err = -ENOMEM; | |
631 | *bad_wr = wr; | |
3853194c | 632 | break; |
ec34a922 RD |
633 | } |
634 | ||
635 | wqe = get_wqe(srq, ind); | |
636 | next_ind = *wqe_to_link(wqe); | |
637 | ||
e23d6d2b RD |
638 | if (next_ind < 0) { |
639 | mthca_err(dev, "SRQ %06x full\n", srq->srqn); | |
640 | err = -ENOMEM; | |
641 | *bad_wr = wr; | |
642 | break; | |
643 | } | |
644 | ||
ec34a922 RD |
645 | ((struct mthca_next_seg *) wqe)->nda_op = |
646 | cpu_to_be32((next_ind << srq->wqe_shift) | 1); | |
647 | ((struct mthca_next_seg *) wqe)->ee_nds = 0; | |
648 | /* flags field will always remain 0 */ | |
649 | ||
650 | wqe += sizeof (struct mthca_next_seg); | |
651 | ||
652 | if (unlikely(wr->num_sge > srq->max_gs)) { | |
653 | err = -EINVAL; | |
654 | *bad_wr = wr; | |
3853194c | 655 | break; |
ec34a922 RD |
656 | } |
657 | ||
658 | for (i = 0; i < wr->num_sge; ++i) { | |
659 | ((struct mthca_data_seg *) wqe)->byte_count = | |
660 | cpu_to_be32(wr->sg_list[i].length); | |
661 | ((struct mthca_data_seg *) wqe)->lkey = | |
662 | cpu_to_be32(wr->sg_list[i].lkey); | |
663 | ((struct mthca_data_seg *) wqe)->addr = | |
664 | cpu_to_be64(wr->sg_list[i].addr); | |
665 | wqe += sizeof (struct mthca_data_seg); | |
666 | } | |
667 | ||
668 | if (i < srq->max_gs) { | |
669 | ((struct mthca_data_seg *) wqe)->byte_count = 0; | |
670 | ((struct mthca_data_seg *) wqe)->lkey = cpu_to_be32(MTHCA_INVAL_LKEY); | |
671 | ((struct mthca_data_seg *) wqe)->addr = 0; | |
672 | } | |
673 | ||
674 | srq->wrid[ind] = wr->wr_id; | |
675 | srq->first_free = next_ind; | |
676 | } | |
677 | ||
678 | if (likely(nreq)) { | |
679 | srq->counter += nreq; | |
680 | ||
681 | /* | |
682 | * Make sure that descriptors are written before | |
683 | * we write doorbell record. | |
684 | */ | |
685 | wmb(); | |
686 | *srq->db = cpu_to_be32(srq->counter); | |
687 | } | |
688 | ||
689 | spin_unlock_irqrestore(&srq->lock, flags); | |
690 | return err; | |
691 | } | |
692 | ||
59fef3b1 JM |
693 | int mthca_max_srq_sge(struct mthca_dev *dev) |
694 | { | |
695 | if (mthca_is_memfree(dev)) | |
696 | return dev->limits.max_sg; | |
697 | ||
698 | /* | |
699 | * SRQ allocations are based on powers of 2 for Tavor, | |
700 | * (although they only need to be multiples of 16 bytes). | |
701 | * | |
702 | * Therefore, we need to base the max number of sg entries on | |
703 | * the largest power of 2 descriptor size that is <= to the | |
704 | * actual max WQE descriptor size, rather than return the | |
705 | * max_sg value given by the firmware (which is based on WQE | |
706 | * sizes as multiples of 16, not powers of 2). | |
707 | * | |
708 | * If SRQ implementation is changed for Tavor to be based on | |
709 | * multiples of 16, the calculation below can be deleted and | |
710 | * the FW max_sg value returned. | |
711 | */ | |
712 | return min_t(int, dev->limits.max_sg, | |
713 | ((1 << (fls(dev->limits.max_desc_sz) - 1)) - | |
714 | sizeof (struct mthca_next_seg)) / | |
715 | sizeof (struct mthca_data_seg)); | |
716 | } | |
717 | ||
f4f3d0f0 | 718 | int mthca_init_srq_table(struct mthca_dev *dev) |
ec34a922 RD |
719 | { |
720 | int err; | |
721 | ||
722 | if (!(dev->mthca_flags & MTHCA_FLAG_SRQ)) | |
723 | return 0; | |
724 | ||
725 | spin_lock_init(&dev->srq_table.lock); | |
726 | ||
727 | err = mthca_alloc_init(&dev->srq_table.alloc, | |
728 | dev->limits.num_srqs, | |
729 | dev->limits.num_srqs - 1, | |
730 | dev->limits.reserved_srqs); | |
731 | if (err) | |
732 | return err; | |
733 | ||
734 | err = mthca_array_init(&dev->srq_table.srq, | |
735 | dev->limits.num_srqs); | |
736 | if (err) | |
737 | mthca_alloc_cleanup(&dev->srq_table.alloc); | |
738 | ||
739 | return err; | |
740 | } | |
741 | ||
e1f7868c | 742 | void mthca_cleanup_srq_table(struct mthca_dev *dev) |
ec34a922 RD |
743 | { |
744 | if (!(dev->mthca_flags & MTHCA_FLAG_SRQ)) | |
745 | return; | |
746 | ||
747 | mthca_array_cleanup(&dev->srq_table.srq, dev->limits.num_srqs); | |
748 | mthca_alloc_cleanup(&dev->srq_table.alloc); | |
749 | } |