5255 uts shouldn't open-code ISP2
1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
24 */
25
26 /*
27 * hermon_srq.c
28 * Hermon Shared Receive Queue Processing Routines
29 *
30 * Implements all the routines necessary for allocating, freeing, querying,
31 * modifying and posting shared receive queues.
32 */
33
34 #include <sys/types.h>
35 #include <sys/conf.h>
36 #include <sys/ddi.h>
37 #include <sys/sunddi.h>
38 #include <sys/modctl.h>
39 #include <sys/bitmap.h>
40
41 #include <sys/ib/adapters/hermon/hermon.h>
42
43 static void hermon_srq_sgl_to_logwqesz(hermon_state_t *state, uint_t num_sgl,
44 hermon_qp_wq_type_t wq_type, uint_t *logwqesz, uint_t *max_sgl);
45
46 /*
47 * hermon_srq_alloc()
48 * Context: Can be called only from user or kernel context.
49 */
50 int
51 hermon_srq_alloc(hermon_state_t *state, hermon_srq_info_t *srqinfo,
52 uint_t sleepflag)
53 {
54 ibt_srq_hdl_t ibt_srqhdl;
55 hermon_pdhdl_t pd;
56 ibt_srq_sizes_t *sizes;
57 ibt_srq_sizes_t *real_sizes;
58 hermon_srqhdl_t *srqhdl;
59 ibt_srq_flags_t flags;
60 hermon_rsrc_t *srqc, *rsrc;
61 hermon_hw_srqc_t srqc_entry;
62 uint32_t *buf;
63 hermon_srqhdl_t srq;
64 hermon_umap_db_entry_t *umapdb;
65 ibt_mr_attr_t mr_attr;
66 hermon_mr_options_t mr_op;
67 hermon_mrhdl_t mr;
68 uint64_t value, srq_desc_off;
69 uint32_t log_srq_size;
70 uint32_t uarpg;
71 uint_t srq_is_umap;
72 int flag, status;
73 uint_t max_sgl;
74 uint_t wqesz;
75 uint_t srq_wr_sz;
76 _NOTE(NOW_INVISIBLE_TO_OTHER_THREADS(*sizes))
77
78 /*
79 * options-->wq_location used to be for location, now explicitly
80 * LOCATION_NORMAL
81 */
82
83 /*
84 * Extract the necessary info from the hermon_srq_info_t structure
85 */
86 real_sizes = srqinfo->srqi_real_sizes;
87 sizes = srqinfo->srqi_sizes;
88 pd = srqinfo->srqi_pd;
89 ibt_srqhdl = srqinfo->srqi_ibt_srqhdl;
90 flags = srqinfo->srqi_flags;
91 srqhdl = srqinfo->srqi_srqhdl;
92
93 /*
94 * Determine whether SRQ is being allocated for userland access or
95 * whether it is being allocated for kernel access. If the SRQ is
96 * being allocated for userland access, then lookup the UAR doorbell
97 * page number for the current process. Note: If this is not found
98 * (e.g. if the process has not previously open()'d the Hermon driver),
99 * then an error is returned.
100 */
101 srq_is_umap = (flags & IBT_SRQ_USER_MAP) ? 1 : 0;
102 if (srq_is_umap) {
103 status = hermon_umap_db_find(state->hs_instance, ddi_get_pid(),
104 MLNX_UMAP_UARPG_RSRC, &value, 0, NULL);
105 if (status != DDI_SUCCESS) {
106 status = IBT_INVALID_PARAM;
107 goto srqalloc_fail3;
108 }
109 uarpg = ((hermon_rsrc_t *)(uintptr_t)value)->hr_indx;
110 } else {
111 uarpg = state->hs_kernel_uar_index;
112 }
113
114 /* Increase PD refcnt */
115 hermon_pd_refcnt_inc(pd);
116
117 /* Allocate an SRQ context entry */
118 status = hermon_rsrc_alloc(state, HERMON_SRQC, 1, sleepflag, &srqc);
119 if (status != DDI_SUCCESS) {
120 status = IBT_INSUFF_RESOURCE;
121 goto srqalloc_fail1;
122 }
123
124 /* Allocate the SRQ Handle entry */
125 status = hermon_rsrc_alloc(state, HERMON_SRQHDL, 1, sleepflag, &rsrc);
126 if (status != DDI_SUCCESS) {
127 status = IBT_INSUFF_RESOURCE;
128 goto srqalloc_fail2;
129 }
130
131 srq = (hermon_srqhdl_t)rsrc->hr_addr;
132 _NOTE(NOW_INVISIBLE_TO_OTHER_THREADS(*srq))
133
134 bzero(srq, sizeof (struct hermon_sw_srq_s));
135 /* Calculate the SRQ number */
136
137 /* just use the index, implicit in Hermon */
138 srq->srq_srqnum = srqc->hr_indx;
139
140 /*
141 * If this will be a user-mappable SRQ, then allocate an entry for
142 * the "userland resources database". This will later be added to
143 * the database (after all further SRQ operations are successful).
144 * If we fail here, we must undo the reference counts and the
145 * previous resource allocation.
146 */
147 if (srq_is_umap) {
148 umapdb = hermon_umap_db_alloc(state->hs_instance,
149 srq->srq_srqnum, MLNX_UMAP_SRQMEM_RSRC,
150 (uint64_t)(uintptr_t)rsrc);
151 if (umapdb == NULL) {
152 status = IBT_INSUFF_RESOURCE;
153 goto srqalloc_fail3;
154 }
155 }
156
157 /*
158 * Allocate the doorbell record. Hermon just needs one for the
159 * SRQ, and use uarpg (above) as the uar index
160 */
161
162 status = hermon_dbr_alloc(state, uarpg, &srq->srq_wq_dbr_acchdl,
163 &srq->srq_wq_vdbr, &srq->srq_wq_pdbr, &srq->srq_rdbr_mapoffset);
164 if (status != DDI_SUCCESS) {
165 status = IBT_INSUFF_RESOURCE;
166 goto srqalloc_fail4;
167 }
168
169 /*
170 * Calculate the appropriate size for the SRQ.
171 * Note: All Hermon SRQs must be a power-of-2 in size. Also
172 * they may not be any smaller than HERMON_SRQ_MIN_SIZE. This step
173 * is to round the requested size up to the next highest power-of-2
174 */
175 srq_wr_sz = max(sizes->srq_wr_sz + 1, HERMON_SRQ_MIN_SIZE);
176 log_srq_size = highbit(srq_wr_sz);
177 if ((srq_wr_sz & (srq_wr_sz - 1)) == 0) {
178 log_srq_size = log_srq_size - 1;
179 }
180
181 /*
182 * Next we verify that the rounded-up size is valid (i.e. consistent
183 * with the device limits and/or software-configured limits). If not,
184 * then obviously we have a lot of cleanup to do before returning.
185 */
186 if (log_srq_size > state->hs_cfg_profile->cp_log_max_srq_sz) {
187 status = IBT_HCA_WR_EXCEEDED;
188 goto srqalloc_fail4a;
189 }
190
191 /*
192 * Next we verify that the requested number of SGL is valid (i.e.
193 * consistent with the device limits and/or software-configured
194 * limits). If not, then obviously the same cleanup needs to be done.
195 */
196 max_sgl = state->hs_ibtfinfo.hca_attr->hca_max_srq_sgl;
197 if (sizes->srq_sgl_sz > max_sgl) {
198 status = IBT_HCA_SGL_EXCEEDED;
199 goto srqalloc_fail4a;
200 }
201
202 /*
203 * Determine the SRQ's WQE sizes. This depends on the requested
204 * number of SGLs. Note: This also has the side-effect of
205 * calculating the real number of SGLs (for the calculated WQE size)
206 */
207 hermon_srq_sgl_to_logwqesz(state, sizes->srq_sgl_sz,
208 HERMON_QP_WQ_TYPE_RECVQ, &srq->srq_wq_log_wqesz,
209 &srq->srq_wq_sgl);
210
211 /*
212 * Allocate the memory for SRQ work queues. Note: The location from
213 * which we will allocate these work queues is always
214 * QUEUE_LOCATION_NORMAL. Since Hermon work queues are not
215 * allowed to cross a 32-bit (4GB) boundary, the alignment of the work
216 * queue memory is very important. We used to allocate work queues
217 * (the combined receive and send queues) so that they would be aligned
218 * on their combined size. That alignment guaranteed that they would
219 * never cross the 4GB boundary (Hermon work queues are on the order of
220 * MBs at maximum). Now we are able to relax this alignment constraint
221 * by ensuring that the IB address assigned to the queue memory (as a
222 * result of the hermon_mr_register() call) is offset from zero.
223 * Previously, we had wanted to use the ddi_dma_mem_alloc() routine to
224 * guarantee the alignment, but when attempting to use IOMMU bypass
225 * mode we found that we were not allowed to specify any alignment that
226 * was more restrictive than the system page size. So we avoided this
227 * constraint by passing two alignment values, one for the memory
228 * allocation itself and the other for the DMA handle (for later bind).
229 * This used to cause more memory than necessary to be allocated (in
230 * order to guarantee the more restrictive alignment contraint). But
231 * be guaranteeing the zero-based IB virtual address for the queue, we
232 * are able to conserve this memory.
233 *
234 * Note: If SRQ is not user-mappable, then it may come from either
235 * kernel system memory or from HCA-attached local DDR memory.
236 *
237 * Note2: We align this queue on a pagesize boundary. This is required
238 * to make sure that all the resulting IB addresses will start at 0, for
239 * a zero-based queue. By making sure we are aligned on at least a
240 * page, any offset we use into our queue will be the same as when we
241 * perform hermon_srq_modify() operations later.
242 */
243 wqesz = (1 << srq->srq_wq_log_wqesz);
244 srq->srq_wqinfo.qa_size = (1 << log_srq_size) * wqesz;
245 srq->srq_wqinfo.qa_alloc_align = PAGESIZE;
246 srq->srq_wqinfo.qa_bind_align = PAGESIZE;
247 if (srq_is_umap) {
248 srq->srq_wqinfo.qa_location = HERMON_QUEUE_LOCATION_USERLAND;
249 } else {
250 srq->srq_wqinfo.qa_location = HERMON_QUEUE_LOCATION_NORMAL;
251 }
252 status = hermon_queue_alloc(state, &srq->srq_wqinfo, sleepflag);
253 if (status != DDI_SUCCESS) {
254 status = IBT_INSUFF_RESOURCE;
255 goto srqalloc_fail4a;
256 }
257 buf = (uint32_t *)srq->srq_wqinfo.qa_buf_aligned;
258 _NOTE(NOW_INVISIBLE_TO_OTHER_THREADS(*buf))
259
260 /*
261 * Register the memory for the SRQ work queues. The memory for the SRQ
262 * must be registered in the Hermon cMPT tables. This gives us the LKey
263 * to specify in the SRQ context later. Note: If the work queue is to
264 * be allocated from DDR memory, then only a "bypass" mapping is
265 * appropriate. And if the SRQ memory is user-mappable, then we force
266 * DDI_DMA_CONSISTENT mapping. Also, in order to meet the alignment
267 * restriction, we pass the "mro_bind_override_addr" flag in the call
268 * to hermon_mr_register(). This guarantees that the resulting IB vaddr
269 * will be zero-based (modulo the offset into the first page). If we
270 * fail here, we still have the bunch of resource and reference count
271 * cleanup to do.
272 */
273 flag = (sleepflag == HERMON_SLEEP) ? IBT_MR_SLEEP :
274 IBT_MR_NOSLEEP;
275 mr_attr.mr_vaddr = (uint64_t)(uintptr_t)buf;
276 mr_attr.mr_len = srq->srq_wqinfo.qa_size;
277 mr_attr.mr_as = NULL;
278 mr_attr.mr_flags = flag | IBT_MR_ENABLE_LOCAL_WRITE;
279 mr_op.mro_bind_type = state->hs_cfg_profile->cp_iommu_bypass;
280 mr_op.mro_bind_dmahdl = srq->srq_wqinfo.qa_dmahdl;
281 mr_op.mro_bind_override_addr = 1;
282 status = hermon_mr_register(state, pd, &mr_attr, &mr,
283 &mr_op, HERMON_SRQ_CMPT);
284 if (status != DDI_SUCCESS) {
285 status = IBT_INSUFF_RESOURCE;
286 goto srqalloc_fail5;
287 }
288 _NOTE(NOW_INVISIBLE_TO_OTHER_THREADS(*mr))
289
290 /*
291 * Calculate the offset between the kernel virtual address space
292 * and the IB virtual address space. This will be used when
293 * posting work requests to properly initialize each WQE.
294 */
295 srq_desc_off = (uint64_t)(uintptr_t)srq->srq_wqinfo.qa_buf_aligned -
296 (uint64_t)mr->mr_bindinfo.bi_addr;
297
298 srq->srq_wq_wqhdr = hermon_wrid_wqhdr_create(1 << log_srq_size);
299
300 /*
301 * Fill in all the return arguments (if necessary). This includes
302 * real queue size and real SGLs.
303 */
304 if (real_sizes != NULL) {
305 real_sizes->srq_wr_sz = (1 << log_srq_size) - 1;
306 real_sizes->srq_sgl_sz = srq->srq_wq_sgl;
307 }
308
309 /*
310 * Fill in the SRQC entry. This is the final step before passing
311 * ownership of the SRQC entry to the Hermon hardware. We use all of
312 * the information collected/calculated above to fill in the
313 * requisite portions of the SRQC. Note: If this SRQ is going to be
314 * used for userland access, then we need to set the UAR page number
315 * appropriately (otherwise it's a "don't care")
316 */
317 bzero(&srqc_entry, sizeof (hermon_hw_srqc_t));
318 srqc_entry.state = HERMON_SRQ_STATE_HW_OWNER;
319 srqc_entry.log_srq_size = log_srq_size;
320 srqc_entry.srqn = srq->srq_srqnum;
321 srqc_entry.log_rq_stride = srq->srq_wq_log_wqesz - 4;
322 /* 16-byte chunks */
323
324 srqc_entry.page_offs = srq->srq_wqinfo.qa_pgoffs >> 6;
325 srqc_entry.log2_pgsz = mr->mr_log2_pgsz;
326 srqc_entry.mtt_base_addrh = (uint32_t)((mr->mr_mttaddr >> 32) & 0xFF);
327 srqc_entry.mtt_base_addrl = mr->mr_mttaddr >> 3;
328 srqc_entry.pd = pd->pd_pdnum;
329 srqc_entry.dbr_addrh = (uint32_t)((uint64_t)srq->srq_wq_pdbr >> 32);
330 srqc_entry.dbr_addrl = (uint32_t)((uint64_t)srq->srq_wq_pdbr >> 2);
331
332 /*
333 * all others - specifically, xrcd, cqn_xrc, lwm, wqe_cnt, and wqe_cntr
334 * are zero thanks to the bzero of the structure
335 */
336
337 /*
338 * Write the SRQC entry to hardware. Lastly, we pass ownership of
339 * the entry to the hardware (using the Hermon SW2HW_SRQ firmware
340 * command). Note: In general, this operation shouldn't fail. But
341 * if it does, we have to undo everything we've done above before
342 * returning error.
343 */
344 status = hermon_cmn_ownership_cmd_post(state, SW2HW_SRQ, &srqc_entry,
345 sizeof (hermon_hw_srqc_t), srq->srq_srqnum,
346 sleepflag);
347 if (status != HERMON_CMD_SUCCESS) {
348 cmn_err(CE_CONT, "Hermon: SW2HW_SRQ command failed: %08x\n",
349 status);
350 if (status == HERMON_CMD_INVALID_STATUS) {
351 hermon_fm_ereport(state, HCA_SYS_ERR, HCA_ERR_SRV_LOST);
352 }
353 status = ibc_get_ci_failure(0);
354 goto srqalloc_fail8;
355 }
356
357 /*
358 * Fill in the rest of the Hermon SRQ handle. We can update
359 * the following fields for use in further operations on the SRQ.
360 */
361 srq->srq_srqcrsrcp = srqc;
362 srq->srq_rsrcp = rsrc;
363 srq->srq_mrhdl = mr;
364 srq->srq_refcnt = 0;
365 srq->srq_is_umap = srq_is_umap;
366 srq->srq_uarpg = uarpg;
367 srq->srq_umap_dhp = (devmap_cookie_t)NULL;
368 srq->srq_pdhdl = pd;
369 srq->srq_wq_bufsz = (1 << log_srq_size);
370 srq->srq_wq_buf = buf;
371 srq->srq_desc_off = srq_desc_off;
372 srq->srq_hdlrarg = (void *)ibt_srqhdl;
373 srq->srq_state = 0;
374 srq->srq_real_sizes.srq_wr_sz = (1 << log_srq_size);
375 srq->srq_real_sizes.srq_sgl_sz = srq->srq_wq_sgl;
376
377 /*
378 * Put SRQ handle in Hermon SRQNum-to-SRQhdl list. Then fill in the
379 * "srqhdl" and return success
380 */
381 hermon_icm_set_num_to_hdl(state, HERMON_SRQC, srqc->hr_indx, srq);
382
383 /*
384 * If this is a user-mappable SRQ, then we need to insert the
385 * previously allocated entry into the "userland resources database".
386 * This will allow for later lookup during devmap() (i.e. mmap())
387 * calls.
388 */
389 if (srq->srq_is_umap) {
390 hermon_umap_db_add(umapdb);
391 } else { /* initialize work queue for kernel SRQs */
392 int i, len, last;
393 uint16_t *desc;
394
395 desc = (uint16_t *)buf;
396 len = wqesz / sizeof (*desc);
397 last = srq->srq_wq_bufsz - 1;
398 for (i = 0; i < last; i++) {
399 desc[1] = htons(i + 1);
400 desc += len;
401 }
402 srq->srq_wq_wqhdr->wq_tail = last;
403 srq->srq_wq_wqhdr->wq_head = 0;
404 }
405
406 *srqhdl = srq;
407
408 return (status);
409
410 /*
411 * The following is cleanup for all possible failure cases in this routine
412 */
413 srqalloc_fail8:
414 hermon_wrid_wqhdr_destroy(srq->srq_wq_wqhdr);
415 srqalloc_fail7:
416 if (hermon_mr_deregister(state, &mr, HERMON_MR_DEREG_ALL,
417 HERMON_SLEEPFLAG_FOR_CONTEXT()) != DDI_SUCCESS) {
418 HERMON_WARNING(state, "failed to deregister SRQ memory");
419 }
420 srqalloc_fail5:
421 hermon_queue_free(&srq->srq_wqinfo);
422 srqalloc_fail4a:
423 hermon_dbr_free(state, uarpg, srq->srq_wq_vdbr);
424 srqalloc_fail4:
425 if (srq_is_umap) {
426 hermon_umap_db_free(umapdb);
427 }
428 srqalloc_fail3:
429 hermon_rsrc_free(state, &rsrc);
430 srqalloc_fail2:
431 hermon_rsrc_free(state, &srqc);
432 srqalloc_fail1:
433 hermon_pd_refcnt_dec(pd);
434 srqalloc_fail:
435 return (status);
436 }
437
438
439 /*
440 * hermon_srq_free()
441 * Context: Can be called only from user or kernel context.
442 */
443 /* ARGSUSED */
444 int
445 hermon_srq_free(hermon_state_t *state, hermon_srqhdl_t *srqhdl,
446 uint_t sleepflag)
447 {
448 hermon_rsrc_t *srqc, *rsrc;
449 hermon_umap_db_entry_t *umapdb;
450 uint64_t value;
451 hermon_srqhdl_t srq;
452 hermon_mrhdl_t mr;
453 hermon_pdhdl_t pd;
454 hermon_hw_srqc_t srqc_entry;
455 uint32_t srqnum;
456 uint_t maxprot;
457 int status;
458
459 /*
460 * Pull all the necessary information from the Hermon Shared Receive
461 * Queue handle. This is necessary here because the resource for the
462 * SRQ handle is going to be freed up as part of this operation.
463 */
464 srq = *srqhdl;
465 mutex_enter(&srq->srq_lock);
466 srqc = srq->srq_srqcrsrcp;
467 rsrc = srq->srq_rsrcp;
468 pd = srq->srq_pdhdl;
469 mr = srq->srq_mrhdl;
470 srqnum = srq->srq_srqnum;
471
472 /*
473 * If there are work queues still associated with the SRQ, then return
474 * an error. Otherwise, we will be holding the SRQ lock.
475 */
476 if (srq->srq_refcnt != 0) {
477 mutex_exit(&srq->srq_lock);
478 return (IBT_SRQ_IN_USE);
479 }
480
481 /*
482 * If this was a user-mappable SRQ, then we need to remove its entry
483 * from the "userland resources database". If it is also currently
484 * mmap()'d out to a user process, then we need to call
485 * devmap_devmem_remap() to remap the SRQ memory to an invalid mapping.
486 * We also need to invalidate the SRQ tracking information for the
487 * user mapping.
488 */
489 if (srq->srq_is_umap) {
490 status = hermon_umap_db_find(state->hs_instance,
491 srq->srq_srqnum, MLNX_UMAP_SRQMEM_RSRC, &value,
492 HERMON_UMAP_DB_REMOVE, &umapdb);
493 if (status != DDI_SUCCESS) {
494 mutex_exit(&srq->srq_lock);
495 HERMON_WARNING(state, "failed to find in database");
496 return (ibc_get_ci_failure(0));
497 }
498 hermon_umap_db_free(umapdb);
499 if (srq->srq_umap_dhp != NULL) {
500 maxprot = (PROT_READ | PROT_WRITE | PROT_USER);
501 status = devmap_devmem_remap(srq->srq_umap_dhp,
502 state->hs_dip, 0, 0, srq->srq_wqinfo.qa_size,
503 maxprot, DEVMAP_MAPPING_INVALID, NULL);
504 if (status != DDI_SUCCESS) {
505 mutex_exit(&srq->srq_lock);
506 HERMON_WARNING(state, "failed in SRQ memory "
507 "devmap_devmem_remap()");
508 return (ibc_get_ci_failure(0));
509 }
510 srq->srq_umap_dhp = (devmap_cookie_t)NULL;
511 }
512 }
513
514 /*
515 * Put NULL into the Hermon SRQNum-to-SRQHdl list. This will allow any
516 * in-progress events to detect that the SRQ corresponding to this
517 * number has been freed.
518 */
519 hermon_icm_set_num_to_hdl(state, HERMON_SRQC, srqc->hr_indx, NULL);
520
521 mutex_exit(&srq->srq_lock);
522 _NOTE(NOW_INVISIBLE_TO_OTHER_THREADS(*srq));
523
524 /*
525 * Reclaim SRQC entry from hardware (using the Hermon HW2SW_SRQ
526 * firmware command). If the ownership transfer fails for any reason,
527 * then it is an indication that something (either in HW or SW) has
528 * gone seriously wrong.
529 */
530 status = hermon_cmn_ownership_cmd_post(state, HW2SW_SRQ, &srqc_entry,
531 sizeof (hermon_hw_srqc_t), srqnum, sleepflag);
532 if (status != HERMON_CMD_SUCCESS) {
533 HERMON_WARNING(state, "failed to reclaim SRQC ownership");
534 cmn_err(CE_CONT, "Hermon: HW2SW_SRQ command failed: %08x\n",
535 status);
536 if (status == HERMON_CMD_INVALID_STATUS) {
537 hermon_fm_ereport(state, HCA_SYS_ERR, HCA_ERR_SRV_LOST);
538 }
539 return (ibc_get_ci_failure(0));
540 }
541
542 /*
543 * Deregister the memory for the Shared Receive Queue. If this fails
544 * for any reason, then it is an indication that something (either
545 * in HW or SW) has gone seriously wrong. So we print a warning
546 * message and return.
547 */
548 status = hermon_mr_deregister(state, &mr, HERMON_MR_DEREG_ALL,
549 sleepflag);
550 if (status != DDI_SUCCESS) {
551 HERMON_WARNING(state, "failed to deregister SRQ memory");
552 return (IBT_FAILURE);
553 }
554
555 hermon_wrid_wqhdr_destroy(srq->srq_wq_wqhdr);
556
557 /* Free the memory for the SRQ */
558 hermon_queue_free(&srq->srq_wqinfo);
559
560 /* Free the dbr */
561 hermon_dbr_free(state, srq->srq_uarpg, srq->srq_wq_vdbr);
562
563 /* Free the Hermon SRQ Handle */
564 hermon_rsrc_free(state, &rsrc);
565
566 /* Free the SRQC entry resource */
567 hermon_rsrc_free(state, &srqc);
568
569 /* Decrement the reference count on the protection domain (PD) */
570 hermon_pd_refcnt_dec(pd);
571
572 /* Set the srqhdl pointer to NULL and return success */
573 *srqhdl = NULL;
574
575 return (DDI_SUCCESS);
576 }
577
578
579 /*
580 * hermon_srq_modify()
581 * Context: Can be called only from user or kernel context.
582 */
583 int
584 hermon_srq_modify(hermon_state_t *state, hermon_srqhdl_t srq, uint_t size,
585 uint_t *real_size, uint_t sleepflag)
586 {
587 hermon_qalloc_info_t new_srqinfo, old_srqinfo;
588 hermon_rsrc_t *mtt, *old_mtt;
589 hermon_bind_info_t bind;
590 hermon_bind_info_t old_bind;
591 hermon_mrhdl_t mr;
592 hermon_hw_srqc_t srqc_entry;
593 hermon_hw_dmpt_t mpt_entry;
594 uint64_t *wre_new, *wre_old;
595 uint64_t mtt_addr;
596 uint64_t srq_pgoffs;
597 uint64_t srq_desc_off;
598 uint32_t *buf, srq_old_bufsz;
599 uint32_t wqesz;
600 uint_t max_srq_size;
601 uint_t mtt_pgsize_bits;
602 uint_t log_srq_size, maxprot;
603 int status;
604
605 if ((state->hs_devlim.mod_wr_srq == 0) ||
606 (state->hs_cfg_profile->cp_srq_resize_enabled == 0))
607 return (IBT_NOT_SUPPORTED);
608
609 /*
610 * If size requested is larger than device capability, return
611 * Insufficient Resources
612 */
613 max_srq_size = (1 << state->hs_cfg_profile->cp_log_max_srq_sz);
614 if (size > max_srq_size) {
615 return (IBT_HCA_WR_EXCEEDED);
616 }
617
618 /*
619 * Calculate the appropriate size for the SRQ.
620 * Note: All Hermon SRQs must be a power-of-2 in size. Also
621 * they may not be any smaller than HERMON_SRQ_MIN_SIZE. This step
622 * is to round the requested size up to the next highest power-of-2
623 */
624 size = max(size, HERMON_SRQ_MIN_SIZE);
625 log_srq_size = highbit(size);
626 if ((size & (size - 1)) == 0) {
627 log_srq_size = log_srq_size - 1;
628 }
629
630 /*
631 * Next we verify that the rounded-up size is valid (i.e. consistent
632 * with the device limits and/or software-configured limits).
633 */
634 if (log_srq_size > state->hs_cfg_profile->cp_log_max_srq_sz) {
635 status = IBT_HCA_WR_EXCEEDED;
636 goto srqmodify_fail;
637 }
638
639 /*
640 * Allocate the memory for newly resized Shared Receive Queue.
641 *
642 * Note: If SRQ is not user-mappable, then it may come from either
643 * kernel system memory or from HCA-attached local DDR memory.
644 *
645 * Note2: We align this queue on a pagesize boundary. This is required
646 * to make sure that all the resulting IB addresses will start at 0,
647 * for a zero-based queue. By making sure we are aligned on at least a
648 * page, any offset we use into our queue will be the same as it was
649 * when we allocated it at hermon_srq_alloc() time.
650 */
651 wqesz = (1 << srq->srq_wq_log_wqesz);
652 new_srqinfo.qa_size = (1 << log_srq_size) * wqesz;
653 new_srqinfo.qa_alloc_align = PAGESIZE;
654 new_srqinfo.qa_bind_align = PAGESIZE;
655 if (srq->srq_is_umap) {
656 new_srqinfo.qa_location = HERMON_QUEUE_LOCATION_USERLAND;
657 } else {
658 new_srqinfo.qa_location = HERMON_QUEUE_LOCATION_NORMAL;
659 }
660 status = hermon_queue_alloc(state, &new_srqinfo, sleepflag);
661 if (status != DDI_SUCCESS) {
662 status = IBT_INSUFF_RESOURCE;
663 goto srqmodify_fail;
664 }
665 buf = (uint32_t *)new_srqinfo.qa_buf_aligned;
666 _NOTE(NOW_INVISIBLE_TO_OTHER_THREADS(*buf))
667
668 /*
669 * Allocate the memory for the new WRE list. This will be used later
670 * when we resize the wridlist based on the new SRQ size.
671 */
672 wre_new = kmem_zalloc((1 << log_srq_size) * sizeof (uint64_t),
673 sleepflag);
674 if (wre_new == NULL) {
675 status = IBT_INSUFF_RESOURCE;
676 goto srqmodify_fail;
677 }
678
679 /*
680 * Fill in the "bind" struct. This struct provides the majority
681 * of the information that will be used to distinguish between an
682 * "addr" binding (as is the case here) and a "buf" binding (see
683 * below). The "bind" struct is later passed to hermon_mr_mem_bind()
684 * which does most of the "heavy lifting" for the Hermon memory
685 * registration routines.
686 */
687 _NOTE(NOW_INVISIBLE_TO_OTHER_THREADS(bind))
688 bzero(&bind, sizeof (hermon_bind_info_t));
689 bind.bi_type = HERMON_BINDHDL_VADDR;
690 bind.bi_addr = (uint64_t)(uintptr_t)buf;
691 bind.bi_len = new_srqinfo.qa_size;
692 bind.bi_as = NULL;
693 bind.bi_flags = sleepflag == HERMON_SLEEP ? IBT_MR_SLEEP :
694 IBT_MR_NOSLEEP | IBT_MR_ENABLE_LOCAL_WRITE;
695 bind.bi_bypass = state->hs_cfg_profile->cp_iommu_bypass;
696
697 status = hermon_mr_mtt_bind(state, &bind, new_srqinfo.qa_dmahdl, &mtt,
698 &mtt_pgsize_bits, 0); /* no relaxed ordering */
699 if (status != DDI_SUCCESS) {
700 status = status;
701 kmem_free(wre_new, (1 << log_srq_size) *
702 sizeof (uint64_t));
703 hermon_queue_free(&new_srqinfo);
704 goto srqmodify_fail;
705 }
706
707 /*
708 * Calculate the offset between the kernel virtual address space
709 * and the IB virtual address space. This will be used when
710 * posting work requests to properly initialize each WQE.
711 *
712 * Note: bind addr is zero-based (from alloc) so we calculate the
713 * correct new offset here.
714 */
715 bind.bi_addr = bind.bi_addr & ((1 << mtt_pgsize_bits) - 1);
716 srq_desc_off = (uint64_t)(uintptr_t)new_srqinfo.qa_buf_aligned -
717 (uint64_t)bind.bi_addr;
718 srq_pgoffs = (uint_t)
719 ((uintptr_t)new_srqinfo.qa_buf_aligned & HERMON_PAGEOFFSET);
720
721 /*
722 * Fill in the MPT entry. This is the final step before passing
723 * ownership of the MPT entry to the Hermon hardware. We use all of
724 * the information collected/calculated above to fill in the
725 * requisite portions of the MPT.
726 */
727 bzero(&mpt_entry, sizeof (hermon_hw_dmpt_t));
728 mpt_entry.reg_win_len = bind.bi_len;
729 mtt_addr = (mtt->hr_indx << HERMON_MTT_SIZE_SHIFT);
730 mpt_entry.mtt_addr_h = mtt_addr >> 32;
731 mpt_entry.mtt_addr_l = mtt_addr >> 3;
732
733 /*
734 * for hermon we build up a new srqc and pass that (partially filled
735 * to resize SRQ instead of modifying the (d)mpt directly
736 */
737
738
739
740 /*
741 * Now we grab the SRQ lock. Since we will be updating the actual
742 * SRQ location and the producer/consumer indexes, we should hold
743 * the lock.
744 *
745 * We do a HERMON_NOSLEEP here (and below), though, because we are
746 * holding the "srq_lock" and if we got raised to interrupt level
747 * by priority inversion, we would not want to block in this routine
748 * waiting for success.
749 */
750 mutex_enter(&srq->srq_lock);
751
752 /*
753 * Copy old entries to new buffer
754 */
755 srq_old_bufsz = srq->srq_wq_bufsz;
756 bcopy(srq->srq_wq_buf, buf, srq_old_bufsz * wqesz);
757
758 /*
759 * Setup MPT information for use in the MODIFY_MPT command
760 */
761 mr = srq->srq_mrhdl;
762 mutex_enter(&mr->mr_lock);
763
764 /*
765 * now, setup the srqc information needed for resize - limit the
766 * values, but use the same structure as the srqc
767 */
768
769 srqc_entry.log_srq_size = log_srq_size;
770 srqc_entry.page_offs = srq_pgoffs >> 6;
771 srqc_entry.log2_pgsz = mr->mr_log2_pgsz;
772 srqc_entry.mtt_base_addrl = (uint64_t)mtt_addr >> 32;
773 srqc_entry.mtt_base_addrh = mtt_addr >> 3;
774
775 /*
776 * RESIZE_SRQ
777 *
778 * If this fails for any reason, then it is an indication that
779 * something (either in HW or SW) has gone seriously wrong. So we
780 * print a warning message and return.
781 */
782 status = hermon_resize_srq_cmd_post(state, &srqc_entry,
783 srq->srq_srqnum, sleepflag);
784 if (status != HERMON_CMD_SUCCESS) {
785 cmn_err(CE_CONT, "Hermon: RESIZE_SRQ command failed: %08x\n",
786 status);
787 if (status == HERMON_CMD_INVALID_STATUS) {
788 hermon_fm_ereport(state, HCA_SYS_ERR, HCA_ERR_SRV_LOST);
789 }
790 (void) hermon_mr_mtt_unbind(state, &bind, mtt);
791 kmem_free(wre_new, (1 << log_srq_size) *
792 sizeof (uint64_t));
793 hermon_queue_free(&new_srqinfo);
794 mutex_exit(&mr->mr_lock);
795 mutex_exit(&srq->srq_lock);
796 return (ibc_get_ci_failure(0));
797 }
798 /*
799 * Update the Hermon Shared Receive Queue handle with all the new
800 * information. At the same time, save away all the necessary
801 * information for freeing up the old resources
802 */
803 old_srqinfo = srq->srq_wqinfo;
804 old_mtt = srq->srq_mrhdl->mr_mttrsrcp;
805 bcopy(&srq->srq_mrhdl->mr_bindinfo, &old_bind,
806 sizeof (hermon_bind_info_t));
807
808 /* Now set the new info */
809 srq->srq_wqinfo = new_srqinfo;
810 srq->srq_wq_buf = buf;
811 srq->srq_wq_bufsz = (1 << log_srq_size);
812 bcopy(&bind, &srq->srq_mrhdl->mr_bindinfo, sizeof (hermon_bind_info_t));
813 srq->srq_mrhdl->mr_mttrsrcp = mtt;
814 srq->srq_desc_off = srq_desc_off;
815 srq->srq_real_sizes.srq_wr_sz = (1 << log_srq_size);
816
817 /* Update MR mtt pagesize */
818 mr->mr_logmttpgsz = mtt_pgsize_bits;
819 mutex_exit(&mr->mr_lock);
820
821 /*
822 * Initialize new wridlist, if needed.
823 *
824 * If a wridlist already is setup on an SRQ (the QP associated with an
825 * SRQ has moved "from_reset") then we must update this wridlist based
826 * on the new SRQ size. We allocate the new size of Work Request ID
827 * Entries, copy over the old entries to the new list, and
828 * re-initialize the srq wridlist in non-umap case
829 */
830 wre_old = srq->srq_wq_wqhdr->wq_wrid;
831
832 bcopy(wre_old, wre_new, srq_old_bufsz * sizeof (uint64_t));
833
834 /* Setup new sizes in wre */
835 srq->srq_wq_wqhdr->wq_wrid = wre_new;
836
837 /*
838 * If "old" SRQ was a user-mappable SRQ that is currently mmap()'d out
839 * to a user process, then we need to call devmap_devmem_remap() to
840 * invalidate the mapping to the SRQ memory. We also need to
841 * invalidate the SRQ tracking information for the user mapping.
842 *
843 * Note: On failure, the remap really shouldn't ever happen. So, if it
844 * does, it is an indication that something has gone seriously wrong.
845 * So we print a warning message and return error (knowing, of course,
846 * that the "old" SRQ memory will be leaked)
847 */
848 if ((srq->srq_is_umap) && (srq->srq_umap_dhp != NULL)) {
849 maxprot = (PROT_READ | PROT_WRITE | PROT_USER);
850 status = devmap_devmem_remap(srq->srq_umap_dhp,
851 state->hs_dip, 0, 0, srq->srq_wqinfo.qa_size, maxprot,
852 DEVMAP_MAPPING_INVALID, NULL);
853 if (status != DDI_SUCCESS) {
854 mutex_exit(&srq->srq_lock);
855 HERMON_WARNING(state, "failed in SRQ memory "
856 "devmap_devmem_remap()");
857 /* We can, however, free the memory for old wre */
858 kmem_free(wre_old, srq_old_bufsz * sizeof (uint64_t));
859 return (ibc_get_ci_failure(0));
860 }
861 srq->srq_umap_dhp = (devmap_cookie_t)NULL;
862 }
863
864 /*
865 * Drop the SRQ lock now. The only thing left to do is to free up
866 * the old resources.
867 */
868 mutex_exit(&srq->srq_lock);
869
870 /*
871 * Unbind the MTT entries.
872 */
873 status = hermon_mr_mtt_unbind(state, &old_bind, old_mtt);
874 if (status != DDI_SUCCESS) {
875 HERMON_WARNING(state, "failed to unbind old SRQ memory");
876 status = ibc_get_ci_failure(0);
877 goto srqmodify_fail;
878 }
879
880 /* Free the memory for old wre */
881 kmem_free(wre_old, srq_old_bufsz * sizeof (uint64_t));
882
883 /* Free the memory for the old SRQ */
884 hermon_queue_free(&old_srqinfo);
885
886 /*
887 * Fill in the return arguments (if necessary). This includes the
888 * real new completion queue size.
889 */
890 if (real_size != NULL) {
891 *real_size = (1 << log_srq_size);
892 }
893
894 return (DDI_SUCCESS);
895
896 srqmodify_fail:
897 return (status);
898 }
899
900
901 /*
902 * hermon_srq_refcnt_inc()
903 * Context: Can be called from interrupt or base context.
904 */
905 void
906 hermon_srq_refcnt_inc(hermon_srqhdl_t srq)
907 {
908 mutex_enter(&srq->srq_lock);
909 srq->srq_refcnt++;
910 mutex_exit(&srq->srq_lock);
911 }
912
913
914 /*
915 * hermon_srq_refcnt_dec()
916 * Context: Can be called from interrupt or base context.
917 */
918 void
919 hermon_srq_refcnt_dec(hermon_srqhdl_t srq)
920 {
921 mutex_enter(&srq->srq_lock);
922 srq->srq_refcnt--;
923 mutex_exit(&srq->srq_lock);
924 }
925
926
927 /*
928 * hermon_srqhdl_from_srqnum()
929 * Context: Can be called from interrupt or base context.
930 *
931 * This routine is important because changing the unconstrained
932 * portion of the SRQ number is critical to the detection of a
933 * potential race condition in the SRQ handler code (i.e. the case
934 * where a SRQ is freed and alloc'd again before an event for the
935 * "old" SRQ can be handled).
936 *
937 * While this is not a perfect solution (not sure that one exists)
938 * it does help to mitigate the chance that this race condition will
939 * cause us to deliver a "stale" event to the new SRQ owner. Note:
940 * this solution does not scale well because the number of constrained
941 * bits increases (and, hence, the number of unconstrained bits
942 * decreases) as the number of supported SRQ grows. For small and
943 * intermediate values, it should hopefully provide sufficient
944 * protection.
945 */
946 hermon_srqhdl_t
947 hermon_srqhdl_from_srqnum(hermon_state_t *state, uint_t srqnum)
948 {
949 uint_t srqindx, srqmask;
950
951 /* Calculate the SRQ table index from the srqnum */
952 srqmask = (1 << state->hs_cfg_profile->cp_log_num_srq) - 1;
953 srqindx = srqnum & srqmask;
954 return (hermon_icm_num_to_hdl(state, HERMON_SRQC, srqindx));
955 }
956
957
958 /*
959 * hermon_srq_sgl_to_logwqesz()
960 * Context: Can be called from interrupt or base context.
961 */
962 static void
963 hermon_srq_sgl_to_logwqesz(hermon_state_t *state, uint_t num_sgl,
964 hermon_qp_wq_type_t wq_type, uint_t *logwqesz, uint_t *max_sgl)
965 {
966 uint_t max_size, log2, actual_sgl;
967
968 switch (wq_type) {
969 case HERMON_QP_WQ_TYPE_RECVQ:
970 /*
971 * Use requested maximum SGL to calculate max descriptor size
972 * (while guaranteeing that the descriptor size is a
973 * power-of-2 cachelines).
974 */
975 max_size = (HERMON_QP_WQE_MLX_SRQ_HDRS + (num_sgl << 4));
976 log2 = highbit(max_size);
977 if ((max_size & (max_size - 1)) == 0) {
978 log2 = log2 - 1;
979 }
980
981 /* Make sure descriptor is at least the minimum size */
982 log2 = max(log2, HERMON_QP_WQE_LOG_MINIMUM);
983
984 /* Calculate actual number of SGL (given WQE size) */
985 actual_sgl = ((1 << log2) - HERMON_QP_WQE_MLX_SRQ_HDRS) >> 4;
986 break;
987
988 default:
989 HERMON_WARNING(state, "unexpected work queue type");
990 break;
991 }
992
993 /* Fill in the return values */
994 *logwqesz = log2;
995 *max_sgl = min(state->hs_cfg_profile->cp_srq_max_sgl, actual_sgl);
996 }
--- EOF ---