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 2009 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /*
28 * tavor_srq.c
29 * Tavor Shared Receive Queue Processing Routines
30 *
31 * Implements all the routines necessary for allocating, freeing, querying,
32 * modifying and posting shared receive queues.
33 */
34
35 #include <sys/types.h>
36 #include <sys/conf.h>
37 #include <sys/ddi.h>
38 #include <sys/sunddi.h>
39 #include <sys/modctl.h>
40 #include <sys/bitmap.h>
41
42 #include <sys/ib/adapters/tavor/tavor.h>
43
44 static void tavor_srq_sgl_to_logwqesz(tavor_state_t *state, uint_t num_sgl,
45 tavor_qp_wq_type_t wq_type, uint_t *logwqesz, uint_t *max_sgl);
46
47 /*
48 * tavor_srq_alloc()
49 * Context: Can be called only from user or kernel context.
50 */
51 int
52 tavor_srq_alloc(tavor_state_t *state, tavor_srq_info_t *srqinfo,
53 uint_t sleepflag, tavor_srq_options_t *op)
54 {
55 ibt_srq_hdl_t ibt_srqhdl;
56 tavor_pdhdl_t pd;
57 ibt_srq_sizes_t *sizes;
58 ibt_srq_sizes_t *real_sizes;
59 tavor_srqhdl_t *srqhdl;
60 ibt_srq_flags_t flags;
61 tavor_rsrc_t *srqc, *rsrc;
62 tavor_hw_srqc_t srqc_entry;
63 uint32_t *buf;
64 tavor_srqhdl_t srq;
65 tavor_umap_db_entry_t *umapdb;
66 ibt_mr_attr_t mr_attr;
67 tavor_mr_options_t mr_op;
68 tavor_mrhdl_t mr;
69 uint64_t addr;
70 uint64_t value, srq_desc_off;
71 uint32_t lkey;
72 uint32_t log_srq_size;
73 uint32_t uarpg;
74 uint_t wq_location, dma_xfer_mode, srq_is_umap;
75 int flag, status;
76 char *errormsg;
77 uint_t max_sgl;
78 uint_t wqesz;
79
80 _NOTE(NOW_INVISIBLE_TO_OTHER_THREADS(*sizes))
81
82 TAVOR_TNF_ENTER(tavor_srq_alloc);
83
84 /*
85 * Check the "options" flag. Currently this flag tells the driver
86 * whether or not the SRQ's work queues should be come from normal
87 * system memory or whether they should be allocated from DDR memory.
88 */
89 if (op == NULL) {
90 wq_location = TAVOR_QUEUE_LOCATION_NORMAL;
91 } else {
92 wq_location = op->srqo_wq_loc;
93 }
94
95 /*
96 * Extract the necessary info from the tavor_srq_info_t structure
97 */
98 real_sizes = srqinfo->srqi_real_sizes;
99 sizes = srqinfo->srqi_sizes;
100 pd = srqinfo->srqi_pd;
101 ibt_srqhdl = srqinfo->srqi_ibt_srqhdl;
102 flags = srqinfo->srqi_flags;
103 srqhdl = srqinfo->srqi_srqhdl;
104
105 /*
106 * Determine whether SRQ is being allocated for userland access or
107 * whether it is being allocated for kernel access. If the SRQ is
108 * being allocated for userland access, then lookup the UAR doorbell
109 * page number for the current process. Note: If this is not found
110 * (e.g. if the process has not previously open()'d the Tavor driver),
111 * then an error is returned.
112 */
113 srq_is_umap = (flags & IBT_SRQ_USER_MAP) ? 1 : 0;
114 if (srq_is_umap) {
115 status = tavor_umap_db_find(state->ts_instance, ddi_get_pid(),
116 MLNX_UMAP_UARPG_RSRC, &value, 0, NULL);
117 if (status != DDI_SUCCESS) {
118 /* Set "status" and "errormsg" and goto failure */
119 TAVOR_TNF_FAIL(IBT_INVALID_PARAM, "failed UAR page");
120 goto srqalloc_fail3;
121 }
122 uarpg = ((tavor_rsrc_t *)(uintptr_t)value)->tr_indx;
123 }
124
125 /* Increase PD refcnt */
126 tavor_pd_refcnt_inc(pd);
127
128 /* Allocate an SRQ context entry */
129 status = tavor_rsrc_alloc(state, TAVOR_SRQC, 1, sleepflag, &srqc);
130 if (status != DDI_SUCCESS) {
131 /* Set "status" and "errormsg" and goto failure */
132 TAVOR_TNF_FAIL(IBT_INSUFF_RESOURCE, "failed SRQ context");
133 goto srqalloc_fail1;
134 }
135
136 /* Allocate the SRQ Handle entry */
137 status = tavor_rsrc_alloc(state, TAVOR_SRQHDL, 1, sleepflag, &rsrc);
138 if (status != DDI_SUCCESS) {
139 /* Set "status" and "errormsg" and goto failure */
140 TAVOR_TNF_FAIL(IBT_INSUFF_RESOURCE, "failed SRQ handle");
141 goto srqalloc_fail2;
142 }
143
144 srq = (tavor_srqhdl_t)rsrc->tr_addr;
145 _NOTE(NOW_INVISIBLE_TO_OTHER_THREADS(*srq))
146
147 srq->srq_srqnum = srqc->tr_indx; /* just use index */
148
149 /*
150 * If this will be a user-mappable SRQ, then allocate an entry for
151 * the "userland resources database". This will later be added to
152 * the database (after all further SRQ operations are successful).
153 * If we fail here, we must undo the reference counts and the
154 * previous resource allocation.
155 */
156 if (srq_is_umap) {
157 umapdb = tavor_umap_db_alloc(state->ts_instance,
158 srq->srq_srqnum, MLNX_UMAP_SRQMEM_RSRC,
159 (uint64_t)(uintptr_t)rsrc);
160 if (umapdb == NULL) {
161 /* Set "status" and "errormsg" and goto failure */
162 TAVOR_TNF_FAIL(IBT_INSUFF_RESOURCE, "failed umap add");
163 goto srqalloc_fail3;
164 }
165 }
166
167 /*
168 * Calculate the appropriate size for the SRQ.
169 * Note: All Tavor SRQs must be a power-of-2 in size. Also
170 * they may not be any smaller than TAVOR_SRQ_MIN_SIZE. This step
171 * is to round the requested size up to the next highest power-of-2
172 */
173 sizes->srq_wr_sz = max(sizes->srq_wr_sz, TAVOR_SRQ_MIN_SIZE);
174 log_srq_size = highbit(sizes->srq_wr_sz);
175 if ((sizes->srq_wr_sz & (sizes->srq_wr_sz - 1)) == 0) {
176 log_srq_size = log_srq_size - 1;
177 }
178
179 /*
180 * Next we verify that the rounded-up size is valid (i.e. consistent
181 * with the device limits and/or software-configured limits). If not,
182 * then obviously we have a lot of cleanup to do before returning.
183 */
184 if (log_srq_size > state->ts_cfg_profile->cp_log_max_srq_sz) {
185 /* Set "status" and "errormsg" and goto failure */
186 TAVOR_TNF_FAIL(IBT_HCA_WR_EXCEEDED, "max SRQ size");
187 goto srqalloc_fail4;
188 }
189
190 /*
191 * Next we verify that the requested number of SGL is valid (i.e.
192 * consistent with the device limits and/or software-configured
193 * limits). If not, then obviously the same cleanup needs to be done.
194 */
195 max_sgl = state->ts_cfg_profile->cp_srq_max_sgl;
196 if (sizes->srq_sgl_sz > max_sgl) {
197 /* Set "status" and "errormsg" and goto failure */
198 TAVOR_TNF_FAIL(IBT_HCA_SGL_EXCEEDED, "max SRQ SGL");
199 goto srqalloc_fail4;
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 tavor_srq_sgl_to_logwqesz(state, sizes->srq_sgl_sz,
208 TAVOR_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 has been passed in through
214 * the tavor_qp_options_t structure. Since Tavor 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 (Tavor 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 tavor_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 tavor_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 = TAVOR_QUEUE_LOCATION_USERLAND;
249 } else {
250 srq->srq_wqinfo.qa_location = wq_location;
251 }
252 status = tavor_queue_alloc(state, &srq->srq_wqinfo, sleepflag);
253 if (status != DDI_SUCCESS) {
254 /* Set "status" and "errormsg" and goto failure */
255 TAVOR_TNF_FAIL(IBT_INSUFF_RESOURCE, "failed srq");
256 goto srqalloc_fail4;
257 }
258 buf = (uint32_t *)srq->srq_wqinfo.qa_buf_aligned;
259 _NOTE(NOW_INVISIBLE_TO_OTHER_THREADS(*buf))
260
261 /*
262 * Register the memory for the SRQ work queues. The memory for the SRQ
263 * must be registered in the Tavor TPT tables. This gives us the LKey
264 * to specify in the SRQ context later. Note: If the work queue is to
265 * be allocated from DDR memory, then only a "bypass" mapping is
266 * appropriate. And if the SRQ memory is user-mappable, then we force
267 * DDI_DMA_CONSISTENT mapping. Also, in order to meet the alignment
268 * restriction, we pass the "mro_bind_override_addr" flag in the call
269 * to tavor_mr_register(). This guarantees that the resulting IB vaddr
270 * will be zero-based (modulo the offset into the first page). If we
271 * fail here, we still have the bunch of resource and reference count
272 * cleanup to do.
273 */
274 flag = (sleepflag == TAVOR_SLEEP) ? IBT_MR_SLEEP :
275 IBT_MR_NOSLEEP;
276 mr_attr.mr_vaddr = (uint64_t)(uintptr_t)buf;
277 mr_attr.mr_len = srq->srq_wqinfo.qa_size;
278 mr_attr.mr_as = NULL;
279 mr_attr.mr_flags = flag | IBT_MR_ENABLE_LOCAL_WRITE;
280 if (srq_is_umap) {
281 mr_op.mro_bind_type = state->ts_cfg_profile->cp_iommu_bypass;
282 } else {
283 if (wq_location == TAVOR_QUEUE_LOCATION_NORMAL) {
284 mr_op.mro_bind_type =
285 state->ts_cfg_profile->cp_iommu_bypass;
286 dma_xfer_mode =
287 state->ts_cfg_profile->cp_streaming_consistent;
288 if (dma_xfer_mode == DDI_DMA_STREAMING) {
289 mr_attr.mr_flags |= IBT_MR_NONCOHERENT;
290 }
291 } else {
292 mr_op.mro_bind_type = TAVOR_BINDMEM_BYPASS;
293 }
294 }
295 mr_op.mro_bind_dmahdl = srq->srq_wqinfo.qa_dmahdl;
296 mr_op.mro_bind_override_addr = 1;
297 status = tavor_mr_register(state, pd, &mr_attr, &mr, &mr_op);
298 if (status != DDI_SUCCESS) {
299 /* Set "status" and "errormsg" and goto failure */
300 TAVOR_TNF_FAIL(IBT_INSUFF_RESOURCE, "failed register mr");
301 goto srqalloc_fail5;
302 }
303 _NOTE(NOW_INVISIBLE_TO_OTHER_THREADS(*mr))
304 addr = mr->mr_bindinfo.bi_addr;
305 lkey = mr->mr_lkey;
306
307 /*
308 * Calculate the offset between the kernel virtual address space
309 * and the IB virtual address space. This will be used when
310 * posting work requests to properly initialize each WQE.
311 */
312 srq_desc_off = (uint64_t)(uintptr_t)srq->srq_wqinfo.qa_buf_aligned -
313 (uint64_t)mr->mr_bindinfo.bi_addr;
314
315 /*
316 * Create WQL and Wridlist for use by this SRQ
317 */
318 srq->srq_wrid_wql = tavor_wrid_wql_create(state);
319 if (srq->srq_wrid_wql == NULL) {
320 /* Set "status" and "errormsg" and goto failure */
321 TAVOR_TNF_FAIL(IBT_INSUFF_RESOURCE, "failed wql create");
322 goto srqalloc_fail6;
323 }
324 _NOTE(NOW_INVISIBLE_TO_OTHER_THREADS(*(srq->srq_wrid_wql)))
325
326 srq->srq_wridlist = tavor_wrid_get_list(1 << log_srq_size);
327 if (srq->srq_wridlist == NULL) {
328 /* Set "status" and "errormsg" and goto failure */
329 TAVOR_TNF_FAIL(IBT_INSUFF_RESOURCE, "failed wridlist create");
330 goto srqalloc_fail7;
331 }
332 _NOTE(NOW_INVISIBLE_TO_OTHER_THREADS(*(srq->srq_wridlist)))
333
334 srq->srq_wridlist->wl_srq_en = 1;
335 srq->srq_wridlist->wl_free_list_indx = -1;
336
337 /*
338 * Fill in all the return arguments (if necessary). This includes
339 * real queue size and real SGLs.
340 */
341 if (real_sizes != NULL) {
342 real_sizes->srq_wr_sz = (1 << log_srq_size);
343 real_sizes->srq_sgl_sz = srq->srq_wq_sgl;
344 }
345
346 /*
347 * Fill in the SRQC entry. This is the final step before passing
348 * ownership of the SRQC entry to the Tavor hardware. We use all of
349 * the information collected/calculated above to fill in the
350 * requisite portions of the SRQC. Note: If this SRQ is going to be
351 * used for userland access, then we need to set the UAR page number
352 * appropriately (otherwise it's a "don't care")
353 */
354 bzero(&srqc_entry, sizeof (tavor_hw_srqc_t));
355 srqc_entry.wqe_addr_h = (addr >> 32);
356 srqc_entry.next_wqe_addr_l = 0;
357 srqc_entry.ds = (wqesz >> 4);
358 srqc_entry.state = TAVOR_SRQ_STATE_HW_OWNER;
359 srqc_entry.pd = pd->pd_pdnum;
360 srqc_entry.lkey = lkey;
361 srqc_entry.wqe_cnt = 0;
362 if (srq_is_umap) {
363 srqc_entry.uar = uarpg;
364 } else {
365 srqc_entry.uar = 0;
366 }
367
368 /*
369 * Write the SRQC entry to hardware. Lastly, we pass ownership of
370 * the entry to the hardware (using the Tavor SW2HW_SRQ firmware
371 * command). Note: In general, this operation shouldn't fail. But
372 * if it does, we have to undo everything we've done above before
373 * returning error.
374 */
375 status = tavor_cmn_ownership_cmd_post(state, SW2HW_SRQ, &srqc_entry,
376 sizeof (tavor_hw_srqc_t), srq->srq_srqnum,
377 sleepflag);
378 if (status != TAVOR_CMD_SUCCESS) {
379 cmn_err(CE_CONT, "Tavor: SW2HW_SRQ command failed: %08x\n",
380 status);
381 TNF_PROBE_1(tavor_srq_alloc_sw2hw_srq_cmd_fail,
382 TAVOR_TNF_ERROR, "", tnf_uint, status, status);
383 /* Set "status" and "errormsg" and goto failure */
384 TAVOR_TNF_FAIL(IBT_FAILURE, "tavor SW2HW_SRQ command");
385 goto srqalloc_fail8;
386 }
387
388 /*
389 * Fill in the rest of the Tavor SRQ handle. We can update
390 * the following fields for use in further operations on the SRQ.
391 */
392 srq->srq_srqcrsrcp = srqc;
393 srq->srq_rsrcp = rsrc;
394 srq->srq_mrhdl = mr;
395 srq->srq_refcnt = 0;
396 srq->srq_is_umap = srq_is_umap;
397 srq->srq_uarpg = (srq->srq_is_umap) ? uarpg : 0;
398 srq->srq_umap_dhp = (devmap_cookie_t)NULL;
399 srq->srq_pdhdl = pd;
400 srq->srq_wq_lastwqeindx = -1;
401 srq->srq_wq_bufsz = (1 << log_srq_size);
402 srq->srq_wq_buf = buf;
403 srq->srq_desc_off = srq_desc_off;
404 srq->srq_hdlrarg = (void *)ibt_srqhdl;
405 srq->srq_state = 0;
406 srq->srq_real_sizes.srq_wr_sz = (1 << log_srq_size);
407 srq->srq_real_sizes.srq_sgl_sz = srq->srq_wq_sgl;
408
409 /* Determine if later ddi_dma_sync will be necessary */
410 srq->srq_sync = TAVOR_SRQ_IS_SYNC_REQ(state, srq->srq_wqinfo);
411
412 /*
413 * Put SRQ handle in Tavor SRQNum-to-SRQhdl list. Then fill in the
414 * "srqhdl" and return success
415 */
416 ASSERT(state->ts_srqhdl[srqc->tr_indx] == NULL);
417 state->ts_srqhdl[srqc->tr_indx] = srq;
418
419 /*
420 * If this is a user-mappable SRQ, then we need to insert the
421 * previously allocated entry into the "userland resources database".
422 * This will allow for later lookup during devmap() (i.e. mmap())
423 * calls.
424 */
425 if (srq->srq_is_umap) {
426 tavor_umap_db_add(umapdb);
427 } else {
428 mutex_enter(&srq->srq_wrid_wql->wql_lock);
429 tavor_wrid_list_srq_init(srq->srq_wridlist, srq, 0);
430 mutex_exit(&srq->srq_wrid_wql->wql_lock);
431 }
432
433 *srqhdl = srq;
434
435 TAVOR_TNF_EXIT(tavor_srq_alloc);
436 return (status);
437
438 /*
439 * The following is cleanup for all possible failure cases in this routine
440 */
441 srqalloc_fail8:
442 kmem_free(srq->srq_wridlist->wl_wre, srq->srq_wridlist->wl_size *
443 sizeof (tavor_wrid_entry_t));
444 kmem_free(srq->srq_wridlist, sizeof (tavor_wrid_list_hdr_t));
445 srqalloc_fail7:
446 tavor_wql_refcnt_dec(srq->srq_wrid_wql);
447 srqalloc_fail6:
448 if (tavor_mr_deregister(state, &mr, TAVOR_MR_DEREG_ALL,
449 TAVOR_SLEEPFLAG_FOR_CONTEXT()) != DDI_SUCCESS) {
450 TAVOR_WARNING(state, "failed to deregister SRQ memory");
451 }
452 srqalloc_fail5:
453 tavor_queue_free(state, &srq->srq_wqinfo);
454 srqalloc_fail4:
455 if (srq_is_umap) {
456 tavor_umap_db_free(umapdb);
457 }
458 srqalloc_fail3:
459 tavor_rsrc_free(state, &rsrc);
460 srqalloc_fail2:
461 tavor_rsrc_free(state, &srqc);
462 srqalloc_fail1:
463 tavor_pd_refcnt_dec(pd);
464 srqalloc_fail:
465 TNF_PROBE_1(tavor_srq_alloc_fail, TAVOR_TNF_ERROR, "",
466 tnf_string, msg, errormsg);
467 TAVOR_TNF_EXIT(tavor_srq_alloc);
468 return (status);
469 }
470
471
472 /*
473 * tavor_srq_free()
474 * Context: Can be called only from user or kernel context.
475 */
476 /* ARGSUSED */
477 int
478 tavor_srq_free(tavor_state_t *state, tavor_srqhdl_t *srqhdl, uint_t sleepflag)
479 {
480 tavor_rsrc_t *srqc, *rsrc;
481 tavor_umap_db_entry_t *umapdb;
482 uint64_t value;
483 tavor_srqhdl_t srq;
484 tavor_mrhdl_t mr;
485 tavor_pdhdl_t pd;
486 tavor_hw_srqc_t srqc_entry;
487 uint32_t srqnum;
488 uint32_t size;
489 uint_t maxprot;
490 int status;
491
492 TAVOR_TNF_ENTER(tavor_srq_free);
493
494 /*
495 * Pull all the necessary information from the Tavor Shared Receive
496 * Queue handle. This is necessary here because the resource for the
497 * SRQ handle is going to be freed up as part of this operation.
498 */
499 srq = *srqhdl;
500 mutex_enter(&srq->srq_lock);
501 srqc = srq->srq_srqcrsrcp;
502 rsrc = srq->srq_rsrcp;
503 pd = srq->srq_pdhdl;
504 mr = srq->srq_mrhdl;
505 srqnum = srq->srq_srqnum;
506
507 /*
508 * If there are work queues still associated with the SRQ, then return
509 * an error. Otherwise, we will be holding the SRQ lock.
510 */
511 if (srq->srq_refcnt != 0) {
512 mutex_exit(&srq->srq_lock);
513 TNF_PROBE_1(tavor_srq_free_refcnt_fail, TAVOR_TNF_ERROR, "",
514 tnf_int, refcnt, srq->srq_refcnt);
515 TAVOR_TNF_EXIT(tavor_srq_free);
516 return (IBT_SRQ_IN_USE);
517 }
518
519 /*
520 * If this was a user-mappable SRQ, then we need to remove its entry
521 * from the "userland resources database". If it is also currently
522 * mmap()'d out to a user process, then we need to call
523 * devmap_devmem_remap() to remap the SRQ memory to an invalid mapping.
524 * We also need to invalidate the SRQ tracking information for the
525 * user mapping.
526 */
527 if (srq->srq_is_umap) {
528 status = tavor_umap_db_find(state->ts_instance, srq->srq_srqnum,
529 MLNX_UMAP_SRQMEM_RSRC, &value, TAVOR_UMAP_DB_REMOVE,
530 &umapdb);
531 if (status != DDI_SUCCESS) {
532 mutex_exit(&srq->srq_lock);
533 TAVOR_WARNING(state, "failed to find in database");
534 TAVOR_TNF_EXIT(tavor_srq_free);
535 return (ibc_get_ci_failure(0));
536 }
537 tavor_umap_db_free(umapdb);
538 if (srq->srq_umap_dhp != NULL) {
539 maxprot = (PROT_READ | PROT_WRITE | PROT_USER);
540 status = devmap_devmem_remap(srq->srq_umap_dhp,
541 state->ts_dip, 0, 0, srq->srq_wqinfo.qa_size,
542 maxprot, DEVMAP_MAPPING_INVALID, NULL);
543 if (status != DDI_SUCCESS) {
544 mutex_exit(&srq->srq_lock);
545 TAVOR_WARNING(state, "failed in SRQ memory "
546 "devmap_devmem_remap()");
547 TAVOR_TNF_EXIT(tavor_srq_free);
548 return (ibc_get_ci_failure(0));
549 }
550 srq->srq_umap_dhp = (devmap_cookie_t)NULL;
551 }
552 }
553
554 /*
555 * Put NULL into the Tavor SRQNum-to-SRQHdl list. This will allow any
556 * in-progress events to detect that the SRQ corresponding to this
557 * number has been freed.
558 */
559 state->ts_srqhdl[srqc->tr_indx] = NULL;
560
561 mutex_exit(&srq->srq_lock);
562 _NOTE(NOW_INVISIBLE_TO_OTHER_THREADS(*srq));
563 _NOTE(NOW_INVISIBLE_TO_OTHER_THREADS(*srq->srq_wridlist));
564
565 /*
566 * Reclaim SRQC entry from hardware (using the Tavor HW2SW_SRQ
567 * firmware command). If the ownership transfer fails for any reason,
568 * then it is an indication that something (either in HW or SW) has
569 * gone seriously wrong.
570 */
571 status = tavor_cmn_ownership_cmd_post(state, HW2SW_SRQ, &srqc_entry,
572 sizeof (tavor_hw_srqc_t), srqnum, sleepflag);
573 if (status != TAVOR_CMD_SUCCESS) {
574 TAVOR_WARNING(state, "failed to reclaim SRQC ownership");
575 cmn_err(CE_CONT, "Tavor: HW2SW_SRQ command failed: %08x\n",
576 status);
577 TNF_PROBE_1(tavor_srq_free_hw2sw_srq_cmd_fail,
578 TAVOR_TNF_ERROR, "", tnf_uint, status, status);
579 TAVOR_TNF_EXIT(tavor_srq_free);
580 return (IBT_FAILURE);
581 }
582
583 /*
584 * Deregister the memory for the Shared Receive Queue. If this fails
585 * for any reason, then it is an indication that something (either
586 * in HW or SW) has gone seriously wrong. So we print a warning
587 * message and return.
588 */
589 status = tavor_mr_deregister(state, &mr, TAVOR_MR_DEREG_ALL,
590 sleepflag);
591 if (status != DDI_SUCCESS) {
592 TAVOR_WARNING(state, "failed to deregister SRQ memory");
593 TNF_PROBE_0(tavor_srq_free_dereg_mr_fail, TAVOR_TNF_ERROR, "");
594 TAVOR_TNF_EXIT(tavor_srq_free);
595 return (IBT_FAILURE);
596 }
597
598 /* Calculate the size and free the wridlist container */
599 if (srq->srq_wridlist != NULL) {
600 size = (srq->srq_wridlist->wl_size *
601 sizeof (tavor_wrid_entry_t));
602 kmem_free(srq->srq_wridlist->wl_wre, size);
603 kmem_free(srq->srq_wridlist, sizeof (tavor_wrid_list_hdr_t));
604
605 /*
606 * Release reference to WQL; If this is the last reference,
607 * this call also has the side effect of freeing up the
608 * 'srq_wrid_wql' memory.
609 */
610 tavor_wql_refcnt_dec(srq->srq_wrid_wql);
611 }
612
613 /* Free the memory for the SRQ */
614 tavor_queue_free(state, &srq->srq_wqinfo);
615
616 /* Free the Tavor SRQ Handle */
617 tavor_rsrc_free(state, &rsrc);
618
619 /* Free the SRQC entry resource */
620 tavor_rsrc_free(state, &srqc);
621
622 /* Decrement the reference count on the protection domain (PD) */
623 tavor_pd_refcnt_dec(pd);
624
625 /* Set the srqhdl pointer to NULL and return success */
626 *srqhdl = NULL;
627
628 TAVOR_TNF_EXIT(tavor_srq_free);
629 return (DDI_SUCCESS);
630 }
631
632
633 /*
634 * tavor_srq_modify()
635 * Context: Can be called only from user or kernel context.
636 */
637 int
638 tavor_srq_modify(tavor_state_t *state, tavor_srqhdl_t srq, uint_t size,
639 uint_t *real_size, uint_t sleepflag)
640 {
641 tavor_qalloc_info_t new_srqinfo, old_srqinfo;
642 tavor_rsrc_t *mtt, *mpt, *old_mtt;
643 tavor_bind_info_t bind;
644 tavor_bind_info_t old_bind;
645 tavor_rsrc_pool_info_t *rsrc_pool;
646 tavor_mrhdl_t mr;
647 tavor_hw_mpt_t mpt_entry;
648 tavor_wrid_entry_t *wre_new, *wre_old;
649 uint64_t mtt_ddrbaseaddr, mtt_addr;
650 uint64_t srq_desc_off;
651 uint32_t *buf, srq_old_bufsz;
652 uint32_t wqesz;
653 uint_t max_srq_size;
654 uint_t dma_xfer_mode, mtt_pgsize_bits;
655 uint_t srq_sync, log_srq_size, maxprot;
656 uint_t wq_location;
657 int status;
658 char *errormsg;
659
660 TAVOR_TNF_ENTER(tavor_srq_modify);
661
662 /*
663 * Check the "inddr" flag. This flag tells the driver whether or not
664 * the SRQ's work queues should be come from normal system memory or
665 * whether they should be allocated from DDR memory.
666 */
667 wq_location = state->ts_cfg_profile->cp_srq_wq_inddr;
668
669 /*
670 * If size requested is larger than device capability, return
671 * Insufficient Resources
672 */
673 max_srq_size = (1 << state->ts_cfg_profile->cp_log_max_srq_sz);
674 if (size > max_srq_size) {
675 TNF_PROBE_0(tavor_srq_modify_size_larger_than_maxsize,
676 TAVOR_TNF_ERROR, "");
677 TAVOR_TNF_EXIT(tavor_srq_modify);
678 return (IBT_HCA_WR_EXCEEDED);
679 }
680
681 /*
682 * Calculate the appropriate size for the SRQ.
683 * Note: All Tavor SRQs must be a power-of-2 in size. Also
684 * they may not be any smaller than TAVOR_SRQ_MIN_SIZE. This step
685 * is to round the requested size up to the next highest power-of-2
686 */
687 size = max(size, TAVOR_SRQ_MIN_SIZE);
688 log_srq_size = highbit(size);
689 if ((size & (size - 1)) == 0) {
690 log_srq_size = log_srq_size - 1;
691 }
692
693 /*
694 * Next we verify that the rounded-up size is valid (i.e. consistent
695 * with the device limits and/or software-configured limits).
696 */
697 if (log_srq_size > state->ts_cfg_profile->cp_log_max_srq_sz) {
698 /* Set "status" and "errormsg" and goto failure */
699 TAVOR_TNF_FAIL(IBT_HCA_WR_EXCEEDED, "max SRQ size");
700 goto srqmodify_fail;
701 }
702
703 /*
704 * Allocate the memory for newly resized Shared Receive Queue.
705 *
706 * Note: If SRQ is not user-mappable, then it may come from either
707 * kernel system memory or from HCA-attached local DDR memory.
708 *
709 * Note2: We align this queue on a pagesize boundary. This is required
710 * to make sure that all the resulting IB addresses will start at 0,
711 * for a zero-based queue. By making sure we are aligned on at least a
712 * page, any offset we use into our queue will be the same as it was
713 * when we allocated it at tavor_srq_alloc() time.
714 */
715 wqesz = (1 << srq->srq_wq_log_wqesz);
716 new_srqinfo.qa_size = (1 << log_srq_size) * wqesz;
717 new_srqinfo.qa_alloc_align = PAGESIZE;
718 new_srqinfo.qa_bind_align = PAGESIZE;
719 if (srq->srq_is_umap) {
720 new_srqinfo.qa_location = TAVOR_QUEUE_LOCATION_USERLAND;
721 } else {
722 new_srqinfo.qa_location = wq_location;
723 }
724 status = tavor_queue_alloc(state, &new_srqinfo, sleepflag);
725 if (status != DDI_SUCCESS) {
726 /* Set "status" and "errormsg" and goto failure */
727 TAVOR_TNF_FAIL(IBT_INSUFF_RESOURCE, "failed srq");
728 goto srqmodify_fail;
729 }
730 buf = (uint32_t *)new_srqinfo.qa_buf_aligned;
731 _NOTE(NOW_INVISIBLE_TO_OTHER_THREADS(*buf))
732
733 /*
734 * Allocate the memory for the new WRE list. This will be used later
735 * when we resize the wridlist based on the new SRQ size.
736 */
737 wre_new = (tavor_wrid_entry_t *)kmem_zalloc((1 << log_srq_size) *
738 sizeof (tavor_wrid_entry_t), sleepflag);
739 if (wre_new == NULL) {
740 /* Set "status" and "errormsg" and goto failure */
741 TAVOR_TNF_FAIL(IBT_INSUFF_RESOURCE,
742 "failed wre_new alloc");
743 goto srqmodify_fail;
744 }
745
746 /*
747 * Fill in the "bind" struct. This struct provides the majority
748 * of the information that will be used to distinguish between an
749 * "addr" binding (as is the case here) and a "buf" binding (see
750 * below). The "bind" struct is later passed to tavor_mr_mem_bind()
751 * which does most of the "heavy lifting" for the Tavor memory
752 * registration routines.
753 */
754 _NOTE(NOW_INVISIBLE_TO_OTHER_THREADS(bind))
755 bzero(&bind, sizeof (tavor_bind_info_t));
756 bind.bi_type = TAVOR_BINDHDL_VADDR;
757 bind.bi_addr = (uint64_t)(uintptr_t)buf;
758 bind.bi_len = new_srqinfo.qa_size;
759 bind.bi_as = NULL;
760 bind.bi_flags = sleepflag == TAVOR_SLEEP ? IBT_MR_SLEEP :
761 IBT_MR_NOSLEEP | IBT_MR_ENABLE_LOCAL_WRITE;
762 if (srq->srq_is_umap) {
763 bind.bi_bypass = state->ts_cfg_profile->cp_iommu_bypass;
764 } else {
765 if (wq_location == TAVOR_QUEUE_LOCATION_NORMAL) {
766 bind.bi_bypass =
767 state->ts_cfg_profile->cp_iommu_bypass;
768 dma_xfer_mode =
769 state->ts_cfg_profile->cp_streaming_consistent;
770 if (dma_xfer_mode == DDI_DMA_STREAMING) {
771 bind.bi_flags |= IBT_MR_NONCOHERENT;
772 }
773 } else {
774 bind.bi_bypass = TAVOR_BINDMEM_BYPASS;
775 }
776 }
777 status = tavor_mr_mtt_bind(state, &bind, new_srqinfo.qa_dmahdl, &mtt,
778 &mtt_pgsize_bits);
779 if (status != DDI_SUCCESS) {
780 /* Set "status" and "errormsg" and goto failure */
781 TAVOR_TNF_FAIL(status, "failed mtt bind");
782 kmem_free(wre_new, srq->srq_wq_bufsz *
783 sizeof (tavor_wrid_entry_t));
784 tavor_queue_free(state, &new_srqinfo);
785 goto srqmodify_fail;
786 }
787
788 /*
789 * Calculate the offset between the kernel virtual address space
790 * and the IB virtual address space. This will be used when
791 * posting work requests to properly initialize each WQE.
792 *
793 * Note: bind addr is zero-based (from alloc) so we calculate the
794 * correct new offset here.
795 */
796 bind.bi_addr = bind.bi_addr & ((1 << mtt_pgsize_bits) - 1);
797 srq_desc_off = (uint64_t)(uintptr_t)new_srqinfo.qa_buf_aligned -
798 (uint64_t)bind.bi_addr;
799
800 /*
801 * Get the base address for the MTT table. This will be necessary
802 * below when we are modifying the MPT entry.
803 */
804 rsrc_pool = &state->ts_rsrc_hdl[TAVOR_MTT];
805 mtt_ddrbaseaddr = (uint64_t)(uintptr_t)rsrc_pool->rsrc_ddr_offset;
806
807 /*
808 * Fill in the MPT entry. This is the final step before passing
809 * ownership of the MPT entry to the Tavor hardware. We use all of
810 * the information collected/calculated above to fill in the
811 * requisite portions of the MPT.
812 */
813 bzero(&mpt_entry, sizeof (tavor_hw_mpt_t));
814 mpt_entry.reg_win_len = bind.bi_len;
815 mtt_addr = mtt_ddrbaseaddr + (mtt->tr_indx << TAVOR_MTT_SIZE_SHIFT);
816 mpt_entry.mttseg_addr_h = mtt_addr >> 32;
817 mpt_entry.mttseg_addr_l = mtt_addr >> 6;
818
819 /*
820 * Now we grab the SRQ lock. Since we will be updating the actual
821 * SRQ location and the producer/consumer indexes, we should hold
822 * the lock.
823 *
824 * We do a TAVOR_NOSLEEP here (and below), though, because we are
825 * holding the "srq_lock" and if we got raised to interrupt level
826 * by priority inversion, we would not want to block in this routine
827 * waiting for success.
828 */
829 mutex_enter(&srq->srq_lock);
830
831 /*
832 * Copy old entries to new buffer
833 */
834 srq_old_bufsz = srq->srq_wq_bufsz;
835 bcopy(srq->srq_wq_buf, buf, srq_old_bufsz * wqesz);
836
837 /* Determine if later ddi_dma_sync will be necessary */
838 srq_sync = TAVOR_SRQ_IS_SYNC_REQ(state, srq->srq_wqinfo);
839
840 /* Sync entire "new" SRQ for use by hardware (if necessary) */
841 if (srq_sync) {
842 (void) ddi_dma_sync(bind.bi_dmahdl, 0,
843 new_srqinfo.qa_size, DDI_DMA_SYNC_FORDEV);
844 }
845
846 /*
847 * Setup MPT information for use in the MODIFY_MPT command
848 */
849 mr = srq->srq_mrhdl;
850 mutex_enter(&mr->mr_lock);
851 mpt = srq->srq_mrhdl->mr_mptrsrcp;
852
853 /*
854 * MODIFY_MPT
855 *
856 * If this fails for any reason, then it is an indication that
857 * something (either in HW or SW) has gone seriously wrong. So we
858 * print a warning message and return.
859 */
860 status = tavor_modify_mpt_cmd_post(state, &mpt_entry, mpt->tr_indx,
861 TAVOR_CMD_MODIFY_MPT_RESIZESRQ, sleepflag);
862 if (status != TAVOR_CMD_SUCCESS) {
863 cmn_err(CE_CONT, "Tavor: MODIFY_MPT command failed: %08x\n",
864 status);
865 TNF_PROBE_1(tavor_mr_common_reg_sw2hw_mpt_cmd_fail,
866 TAVOR_TNF_ERROR, "", tnf_uint, status, status);
867 TAVOR_TNF_FAIL(status, "MODIFY_MPT command failed");
868 (void) tavor_mr_mtt_unbind(state, &srq->srq_mrhdl->mr_bindinfo,
869 srq->srq_mrhdl->mr_mttrsrcp);
870 kmem_free(wre_new, srq->srq_wq_bufsz *
871 sizeof (tavor_wrid_entry_t));
872 tavor_queue_free(state, &new_srqinfo);
873 mutex_exit(&mr->mr_lock);
874 mutex_exit(&srq->srq_lock);
875 return (ibc_get_ci_failure(0));
876 }
877
878 /*
879 * Update the Tavor Shared Receive Queue handle with all the new
880 * information. At the same time, save away all the necessary
881 * information for freeing up the old resources
882 */
883 old_srqinfo = srq->srq_wqinfo;
884 old_mtt = srq->srq_mrhdl->mr_mttrsrcp;
885 bcopy(&srq->srq_mrhdl->mr_bindinfo, &old_bind,
886 sizeof (tavor_bind_info_t));
887
888 /* Now set the new info */
889 srq->srq_wqinfo = new_srqinfo;
890 srq->srq_wq_buf = buf;
891 srq->srq_wq_bufsz = (1 << log_srq_size);
892 bcopy(&bind, &srq->srq_mrhdl->mr_bindinfo, sizeof (tavor_bind_info_t));
893 srq->srq_mrhdl->mr_mttrsrcp = mtt;
894 srq->srq_desc_off = srq_desc_off;
895 srq->srq_real_sizes.srq_wr_sz = (1 << log_srq_size);
896
897 /* Update MR mtt pagesize */
898 mr->mr_logmttpgsz = mtt_pgsize_bits;
899 mutex_exit(&mr->mr_lock);
900
901 #ifdef __lock_lint
902 mutex_enter(&srq->srq_wrid_wql->wql_lock);
903 #else
904 if (srq->srq_wrid_wql != NULL) {
905 mutex_enter(&srq->srq_wrid_wql->wql_lock);
906 }
907 #endif
908
909 /*
910 * Initialize new wridlist, if needed.
911 *
912 * If a wridlist already is setup on an SRQ (the QP associated with an
913 * SRQ has moved "from_reset") then we must update this wridlist based
914 * on the new SRQ size. We allocate the new size of Work Request ID
915 * Entries, copy over the old entries to the new list, and
916 * re-initialize the srq wridlist in non-umap case
917 */
918 wre_old = NULL;
919 if (srq->srq_wridlist != NULL) {
920 wre_old = srq->srq_wridlist->wl_wre;
921
922 bcopy(wre_old, wre_new, srq_old_bufsz *
923 sizeof (tavor_wrid_entry_t));
924
925 /* Setup new sizes in wre */
926 srq->srq_wridlist->wl_wre = wre_new;
927 srq->srq_wridlist->wl_size = srq->srq_wq_bufsz;
928
929 if (!srq->srq_is_umap) {
930 tavor_wrid_list_srq_init(srq->srq_wridlist, srq,
931 srq_old_bufsz);
932 }
933 }
934
935 #ifdef __lock_lint
936 mutex_exit(&srq->srq_wrid_wql->wql_lock);
937 #else
938 if (srq->srq_wrid_wql != NULL) {
939 mutex_exit(&srq->srq_wrid_wql->wql_lock);
940 }
941 #endif
942
943 /*
944 * If "old" SRQ was a user-mappable SRQ that is currently mmap()'d out
945 * to a user process, then we need to call devmap_devmem_remap() to
946 * invalidate the mapping to the SRQ memory. We also need to
947 * invalidate the SRQ tracking information for the user mapping.
948 *
949 * Note: On failure, the remap really shouldn't ever happen. So, if it
950 * does, it is an indication that something has gone seriously wrong.
951 * So we print a warning message and return error (knowing, of course,
952 * that the "old" SRQ memory will be leaked)
953 */
954 if ((srq->srq_is_umap) && (srq->srq_umap_dhp != NULL)) {
955 maxprot = (PROT_READ | PROT_WRITE | PROT_USER);
956 status = devmap_devmem_remap(srq->srq_umap_dhp,
957 state->ts_dip, 0, 0, srq->srq_wqinfo.qa_size, maxprot,
958 DEVMAP_MAPPING_INVALID, NULL);
959 if (status != DDI_SUCCESS) {
960 mutex_exit(&srq->srq_lock);
961 TAVOR_WARNING(state, "failed in SRQ memory "
962 "devmap_devmem_remap()");
963 /* We can, however, free the memory for old wre */
964 if (wre_old != NULL) {
965 kmem_free(wre_old, srq_old_bufsz *
966 sizeof (tavor_wrid_entry_t));
967 }
968 TAVOR_TNF_EXIT(tavor_srq_modify);
969 return (ibc_get_ci_failure(0));
970 }
971 srq->srq_umap_dhp = (devmap_cookie_t)NULL;
972 }
973
974 /*
975 * Drop the SRQ lock now. The only thing left to do is to free up
976 * the old resources.
977 */
978 mutex_exit(&srq->srq_lock);
979
980 /*
981 * Unbind the MTT entries.
982 */
983 status = tavor_mr_mtt_unbind(state, &old_bind, old_mtt);
984 if (status != DDI_SUCCESS) {
985 TAVOR_WARNING(state, "failed to unbind old SRQ memory");
986 /* Set "status" and "errormsg" and goto failure */
987 TAVOR_TNF_FAIL(ibc_get_ci_failure(0),
988 "failed to unbind (old)");
989 goto srqmodify_fail;
990 }
991
992 /* Free the memory for old wre */
993 if (wre_old != NULL) {
994 kmem_free(wre_old, srq_old_bufsz *
995 sizeof (tavor_wrid_entry_t));
996 }
997
998 /* Free the memory for the old SRQ */
999 tavor_queue_free(state, &old_srqinfo);
1000
1001 /*
1002 * Fill in the return arguments (if necessary). This includes the
1003 * real new completion queue size.
1004 */
1005 if (real_size != NULL) {
1006 *real_size = (1 << log_srq_size);
1007 }
1008
1009 TAVOR_TNF_EXIT(tavor_srq_modify);
1010 return (DDI_SUCCESS);
1011
1012 srqmodify_fail:
1013 TNF_PROBE_1(tavor_srq_modify_fail, TAVOR_TNF_ERROR, "",
1014 tnf_string, msg, errormsg);
1015 TAVOR_TNF_EXIT(tavor_srq_modify);
1016 return (status);
1017 }
1018
1019
1020 /*
1021 * tavor_srq_refcnt_inc()
1022 * Context: Can be called from interrupt or base context.
1023 */
1024 void
1025 tavor_srq_refcnt_inc(tavor_srqhdl_t srq)
1026 {
1027 mutex_enter(&srq->srq_lock);
1028 TNF_PROBE_1_DEBUG(tavor_srq_refcnt_inc, TAVOR_TNF_TRACE, "",
1029 tnf_uint, refcnt, srq->srq_refcnt);
1030 srq->srq_refcnt++;
1031 mutex_exit(&srq->srq_lock);
1032 }
1033
1034
1035 /*
1036 * tavor_srq_refcnt_dec()
1037 * Context: Can be called from interrupt or base context.
1038 */
1039 void
1040 tavor_srq_refcnt_dec(tavor_srqhdl_t srq)
1041 {
1042 mutex_enter(&srq->srq_lock);
1043 srq->srq_refcnt--;
1044 TNF_PROBE_1_DEBUG(tavor_srq_refcnt_dec, TAVOR_TNF_TRACE, "",
1045 tnf_uint, refcnt, srq->srq_refcnt);
1046 mutex_exit(&srq->srq_lock);
1047 }
1048
1049
1050 /*
1051 * tavor_srqhdl_from_srqnum()
1052 * Context: Can be called from interrupt or base context.
1053 *
1054 * This routine is important because changing the unconstrained
1055 * portion of the SRQ number is critical to the detection of a
1056 * potential race condition in the SRQ handler code (i.e. the case
1057 * where a SRQ is freed and alloc'd again before an event for the
1058 * "old" SRQ can be handled).
1059 *
1060 * While this is not a perfect solution (not sure that one exists)
1061 * it does help to mitigate the chance that this race condition will
1062 * cause us to deliver a "stale" event to the new SRQ owner. Note:
1063 * this solution does not scale well because the number of constrained
1064 * bits increases (and, hence, the number of unconstrained bits
1065 * decreases) as the number of supported SRQ grows. For small and
1066 * intermediate values, it should hopefully provide sufficient
1067 * protection.
1068 */
1069 tavor_srqhdl_t
1070 tavor_srqhdl_from_srqnum(tavor_state_t *state, uint_t srqnum)
1071 {
1072 uint_t srqindx, srqmask;
1073
1074 /* Calculate the SRQ table index from the srqnum */
1075 srqmask = (1 << state->ts_cfg_profile->cp_log_num_srq) - 1;
1076 srqindx = srqnum & srqmask;
1077 return (state->ts_srqhdl[srqindx]);
1078 }
1079
1080
1081 /*
1082 * tavor_srq_sgl_to_logwqesz()
1083 * Context: Can be called from interrupt or base context.
1084 */
1085 static void
1086 tavor_srq_sgl_to_logwqesz(tavor_state_t *state, uint_t num_sgl,
1087 tavor_qp_wq_type_t wq_type, uint_t *logwqesz, uint_t *max_sgl)
1088 {
1089 uint_t max_size, log2, actual_sgl;
1090
1091 TAVOR_TNF_ENTER(tavor_srq_sgl_to_logwqesz);
1092
1093 switch (wq_type) {
1094 case TAVOR_QP_WQ_TYPE_RECVQ:
1095 /*
1096 * Use requested maximum SGL to calculate max descriptor size
1097 * (while guaranteeing that the descriptor size is a
1098 * power-of-2 cachelines).
1099 */
1100 max_size = (TAVOR_QP_WQE_MLX_RCV_HDRS + (num_sgl << 4));
1101 log2 = highbit(max_size);
1102 if ((max_size & (max_size - 1)) == 0) {
1103 log2 = log2 - 1;
1104 }
1105
1106 /* Make sure descriptor is at least the minimum size */
1107 log2 = max(log2, TAVOR_QP_WQE_LOG_MINIMUM);
1108
1109 /* Calculate actual number of SGL (given WQE size) */
1110 actual_sgl = ((1 << log2) - TAVOR_QP_WQE_MLX_RCV_HDRS) >> 4;
1111 break;
1112
1113 default:
1114 TAVOR_WARNING(state, "unexpected work queue type");
1115 TNF_PROBE_0(tavor_srq_sgl_to_logwqesz_inv_wqtype_fail,
1116 TAVOR_TNF_ERROR, "");
1117 break;
1118 }
1119
1120 /* Fill in the return values */
1121 *logwqesz = log2;
1122 *max_sgl = min(state->ts_cfg_profile->cp_srq_max_sgl, actual_sgl);
1123
1124 TAVOR_TNF_EXIT(tavor_qp_sgl_to_logwqesz);
1125 }
--- EOF ---