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/sysmacros.h> 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/hermon/hermon.h> 43 44 static void hermon_srq_sgl_to_logwqesz(hermon_state_t *state, uint_t num_sgl, 45 hermon_qp_wq_type_t wq_type, uint_t *logwqesz, uint_t *max_sgl); 46 47 /* 48 * hermon_srq_alloc() 49 * Context: Can be called only from user or kernel context. 50 */ 51 int 52 hermon_srq_alloc(hermon_state_t *state, hermon_srq_info_t *srqinfo, 53 uint_t sleepflag) 54 { 55 ibt_srq_hdl_t ibt_srqhdl; 56 hermon_pdhdl_t pd; 57 ibt_srq_sizes_t *sizes; 58 ibt_srq_sizes_t *real_sizes; 59 hermon_srqhdl_t *srqhdl; 60 ibt_srq_flags_t flags; 61 hermon_rsrc_t *srqc, *rsrc; 62 hermon_hw_srqc_t srqc_entry; 63 uint32_t *buf; 64 hermon_srqhdl_t srq; 65 hermon_umap_db_entry_t *umapdb; 66 ibt_mr_attr_t mr_attr; 67 hermon_mr_options_t mr_op; 68 hermon_mrhdl_t mr; 69 uint64_t value, srq_desc_off; 70 uint32_t log_srq_size; 71 uint32_t uarpg; 72 uint_t srq_is_umap; 73 int flag, status; 74 uint_t max_sgl; 75 uint_t wqesz; 76 uint_t srq_wr_sz; 77 _NOTE(NOW_INVISIBLE_TO_OTHER_THREADS(*sizes)) 78 79 /* 80 * options-->wq_location used to be for location, now explicitly 81 * LOCATION_NORMAL 82 */ 83 84 /* 85 * Extract the necessary info from the hermon_srq_info_t structure 86 */ 87 real_sizes = srqinfo->srqi_real_sizes; 88 sizes = srqinfo->srqi_sizes; 89 pd = srqinfo->srqi_pd; 90 ibt_srqhdl = srqinfo->srqi_ibt_srqhdl; 91 flags = srqinfo->srqi_flags; 92 srqhdl = srqinfo->srqi_srqhdl; 93 94 /* 95 * Determine whether SRQ is being allocated for userland access or 96 * whether it is being allocated for kernel access. If the SRQ is 97 * being allocated for userland access, then lookup the UAR doorbell 98 * page number for the current process. Note: If this is not found 99 * (e.g. if the process has not previously open()'d the Hermon driver), 100 * then an error is returned. 101 */ 102 srq_is_umap = (flags & IBT_SRQ_USER_MAP) ? 1 : 0; 103 if (srq_is_umap) { 104 status = hermon_umap_db_find(state->hs_instance, ddi_get_pid(), 105 MLNX_UMAP_UARPG_RSRC, &value, 0, NULL); 106 if (status != DDI_SUCCESS) { 107 status = IBT_INVALID_PARAM; 108 goto srqalloc_fail3; 109 } 110 uarpg = ((hermon_rsrc_t *)(uintptr_t)value)->hr_indx; 111 } else { 112 uarpg = state->hs_kernel_uar_index; 113 } 114 115 /* Increase PD refcnt */ 116 hermon_pd_refcnt_inc(pd); 117 118 /* Allocate an SRQ context entry */ 119 status = hermon_rsrc_alloc(state, HERMON_SRQC, 1, sleepflag, &srqc); 120 if (status != DDI_SUCCESS) { 121 status = IBT_INSUFF_RESOURCE; 122 goto srqalloc_fail1; 123 } 124 125 /* Allocate the SRQ Handle entry */ 126 status = hermon_rsrc_alloc(state, HERMON_SRQHDL, 1, sleepflag, &rsrc); 127 if (status != DDI_SUCCESS) { 128 status = IBT_INSUFF_RESOURCE; 129 goto srqalloc_fail2; 130 } 131 132 srq = (hermon_srqhdl_t)rsrc->hr_addr; 133 _NOTE(NOW_INVISIBLE_TO_OTHER_THREADS(*srq)) 134 135 bzero(srq, sizeof (struct hermon_sw_srq_s)); 136 /* Calculate the SRQ number */ 137 138 /* just use the index, implicit in Hermon */ 139 srq->srq_srqnum = srqc->hr_indx; 140 141 /* 142 * If this will be a user-mappable SRQ, then allocate an entry for 143 * the "userland resources database". This will later be added to 144 * the database (after all further SRQ operations are successful). 145 * If we fail here, we must undo the reference counts and the 146 * previous resource allocation. 147 */ 148 if (srq_is_umap) { 149 umapdb = hermon_umap_db_alloc(state->hs_instance, 150 srq->srq_srqnum, MLNX_UMAP_SRQMEM_RSRC, 151 (uint64_t)(uintptr_t)rsrc); 152 if (umapdb == NULL) { 153 status = IBT_INSUFF_RESOURCE; 154 goto srqalloc_fail3; 155 } 156 } 157 158 /* 159 * Allocate the doorbell record. Hermon just needs one for the 160 * SRQ, and use uarpg (above) as the uar index 161 */ 162 163 status = hermon_dbr_alloc(state, uarpg, &srq->srq_wq_dbr_acchdl, 164 &srq->srq_wq_vdbr, &srq->srq_wq_pdbr, &srq->srq_rdbr_mapoffset); 165 if (status != DDI_SUCCESS) { 166 status = IBT_INSUFF_RESOURCE; 167 goto srqalloc_fail4; 168 } 169 170 /* 171 * Calculate the appropriate size for the SRQ. 172 * Note: All Hermon SRQs must be a power-of-2 in size. Also 173 * they may not be any smaller than HERMON_SRQ_MIN_SIZE. This step 174 * is to round the requested size up to the next highest power-of-2 175 */ 176 srq_wr_sz = max(sizes->srq_wr_sz + 1, HERMON_SRQ_MIN_SIZE); 177 log_srq_size = highbit(srq_wr_sz); 178 if (ISP2(srq_wr_sz)) { 179 log_srq_size = log_srq_size - 1; 180 } 181 182 /* 183 * Next we verify that the rounded-up size is valid (i.e. consistent 184 * with the device limits and/or software-configured limits). If not, 185 * then obviously we have a lot of cleanup to do before returning. 186 */ 187 if (log_srq_size > state->hs_cfg_profile->cp_log_max_srq_sz) { 188 status = IBT_HCA_WR_EXCEEDED; 189 goto srqalloc_fail4a; 190 } 191 192 /* 193 * Next we verify that the requested number of SGL is valid (i.e. 194 * consistent with the device limits and/or software-configured 195 * limits). If not, then obviously the same cleanup needs to be done. 196 */ 197 max_sgl = state->hs_ibtfinfo.hca_attr->hca_max_srq_sgl; 198 if (sizes->srq_sgl_sz > max_sgl) { 199 status = IBT_HCA_SGL_EXCEEDED; 200 goto srqalloc_fail4a; 201 } 202 203 /* 204 * Determine the SRQ's WQE sizes. This depends on the requested 205 * number of SGLs. Note: This also has the side-effect of 206 * calculating the real number of SGLs (for the calculated WQE size) 207 */ 208 hermon_srq_sgl_to_logwqesz(state, sizes->srq_sgl_sz, 209 HERMON_QP_WQ_TYPE_RECVQ, &srq->srq_wq_log_wqesz, 210 &srq->srq_wq_sgl); 211 212 /* 213 * Allocate the memory for SRQ work queues. Note: The location from 214 * which we will allocate these work queues is always 215 * QUEUE_LOCATION_NORMAL. Since Hermon work queues are not 216 * allowed to cross a 32-bit (4GB) boundary, the alignment of the work 217 * queue memory is very important. We used to allocate work queues 218 * (the combined receive and send queues) so that they would be aligned 219 * on their combined size. That alignment guaranteed that they would 220 * never cross the 4GB boundary (Hermon work queues are on the order of 221 * MBs at maximum). Now we are able to relax this alignment constraint 222 * by ensuring that the IB address assigned to the queue memory (as a 223 * result of the hermon_mr_register() call) is offset from zero. 224 * Previously, we had wanted to use the ddi_dma_mem_alloc() routine to 225 * guarantee the alignment, but when attempting to use IOMMU bypass 226 * mode we found that we were not allowed to specify any alignment that 227 * was more restrictive than the system page size. So we avoided this 228 * constraint by passing two alignment values, one for the memory 229 * allocation itself and the other for the DMA handle (for later bind). 230 * This used to cause more memory than necessary to be allocated (in 231 * order to guarantee the more restrictive alignment contraint). But 232 * be guaranteeing the zero-based IB virtual address for the queue, we 233 * are able to conserve this memory. 234 * 235 * Note: If SRQ is not user-mappable, then it may come from either 236 * kernel system memory or from HCA-attached local DDR memory. 237 * 238 * Note2: We align this queue on a pagesize boundary. This is required 239 * to make sure that all the resulting IB addresses will start at 0, for 240 * a zero-based queue. By making sure we are aligned on at least a 241 * page, any offset we use into our queue will be the same as when we 242 * perform hermon_srq_modify() operations later. 243 */ 244 wqesz = (1 << srq->srq_wq_log_wqesz); 245 srq->srq_wqinfo.qa_size = (1 << log_srq_size) * wqesz; 246 srq->srq_wqinfo.qa_alloc_align = PAGESIZE; 247 srq->srq_wqinfo.qa_bind_align = PAGESIZE; 248 if (srq_is_umap) { 249 srq->srq_wqinfo.qa_location = HERMON_QUEUE_LOCATION_USERLAND; 250 } else { 251 srq->srq_wqinfo.qa_location = HERMON_QUEUE_LOCATION_NORMAL; 252 } 253 status = hermon_queue_alloc(state, &srq->srq_wqinfo, sleepflag); 254 if (status != DDI_SUCCESS) { 255 status = IBT_INSUFF_RESOURCE; 256 goto srqalloc_fail4a; 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 Hermon cMPT 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 hermon_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 == HERMON_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 mr_op.mro_bind_type = state->hs_cfg_profile->cp_iommu_bypass; 281 mr_op.mro_bind_dmahdl = srq->srq_wqinfo.qa_dmahdl; 282 mr_op.mro_bind_override_addr = 1; 283 status = hermon_mr_register(state, pd, &mr_attr, &mr, 284 &mr_op, HERMON_SRQ_CMPT); 285 if (status != DDI_SUCCESS) { 286 status = IBT_INSUFF_RESOURCE; 287 goto srqalloc_fail5; 288 } 289 _NOTE(NOW_INVISIBLE_TO_OTHER_THREADS(*mr)) 290 291 /* 292 * Calculate the offset between the kernel virtual address space 293 * and the IB virtual address space. This will be used when 294 * posting work requests to properly initialize each WQE. 295 */ 296 srq_desc_off = (uint64_t)(uintptr_t)srq->srq_wqinfo.qa_buf_aligned - 297 (uint64_t)mr->mr_bindinfo.bi_addr; 298 299 srq->srq_wq_wqhdr = hermon_wrid_wqhdr_create(1 << log_srq_size); 300 301 /* 302 * Fill in all the return arguments (if necessary). This includes 303 * real queue size and real SGLs. 304 */ 305 if (real_sizes != NULL) { 306 real_sizes->srq_wr_sz = (1 << log_srq_size) - 1; 307 real_sizes->srq_sgl_sz = srq->srq_wq_sgl; 308 } 309 310 /* 311 * Fill in the SRQC entry. This is the final step before passing 312 * ownership of the SRQC entry to the Hermon hardware. We use all of 313 * the information collected/calculated above to fill in the 314 * requisite portions of the SRQC. Note: If this SRQ is going to be 315 * used for userland access, then we need to set the UAR page number 316 * appropriately (otherwise it's a "don't care") 317 */ 318 bzero(&srqc_entry, sizeof (hermon_hw_srqc_t)); 319 srqc_entry.state = HERMON_SRQ_STATE_HW_OWNER; 320 srqc_entry.log_srq_size = log_srq_size; 321 srqc_entry.srqn = srq->srq_srqnum; 322 srqc_entry.log_rq_stride = srq->srq_wq_log_wqesz - 4; 323 /* 16-byte chunks */ 324 325 srqc_entry.page_offs = srq->srq_wqinfo.qa_pgoffs >> 6; 326 srqc_entry.log2_pgsz = mr->mr_log2_pgsz; 327 srqc_entry.mtt_base_addrh = (uint32_t)((mr->mr_mttaddr >> 32) & 0xFF); 328 srqc_entry.mtt_base_addrl = mr->mr_mttaddr >> 3; 329 srqc_entry.pd = pd->pd_pdnum; 330 srqc_entry.dbr_addrh = (uint32_t)((uint64_t)srq->srq_wq_pdbr >> 32); 331 srqc_entry.dbr_addrl = (uint32_t)((uint64_t)srq->srq_wq_pdbr >> 2); 332 333 /* 334 * all others - specifically, xrcd, cqn_xrc, lwm, wqe_cnt, and wqe_cntr 335 * are zero thanks to the bzero of the structure 336 */ 337 338 /* 339 * Write the SRQC entry to hardware. Lastly, we pass ownership of 340 * the entry to the hardware (using the Hermon SW2HW_SRQ firmware 341 * command). Note: In general, this operation shouldn't fail. But 342 * if it does, we have to undo everything we've done above before 343 * returning error. 344 */ 345 status = hermon_cmn_ownership_cmd_post(state, SW2HW_SRQ, &srqc_entry, 346 sizeof (hermon_hw_srqc_t), srq->srq_srqnum, 347 sleepflag); 348 if (status != HERMON_CMD_SUCCESS) { 349 cmn_err(CE_CONT, "Hermon: SW2HW_SRQ command failed: %08x\n", 350 status); 351 if (status == HERMON_CMD_INVALID_STATUS) { 352 hermon_fm_ereport(state, HCA_SYS_ERR, HCA_ERR_SRV_LOST); 353 } 354 status = ibc_get_ci_failure(0); 355 goto srqalloc_fail8; 356 } 357 358 /* 359 * Fill in the rest of the Hermon SRQ handle. We can update 360 * the following fields for use in further operations on the SRQ. 361 */ 362 srq->srq_srqcrsrcp = srqc; 363 srq->srq_rsrcp = rsrc; 364 srq->srq_mrhdl = mr; 365 srq->srq_refcnt = 0; 366 srq->srq_is_umap = srq_is_umap; 367 srq->srq_uarpg = uarpg; 368 srq->srq_umap_dhp = (devmap_cookie_t)NULL; 369 srq->srq_pdhdl = pd; 370 srq->srq_wq_bufsz = (1 << log_srq_size); 371 srq->srq_wq_buf = buf; 372 srq->srq_desc_off = srq_desc_off; 373 srq->srq_hdlrarg = (void *)ibt_srqhdl; 374 srq->srq_state = 0; 375 srq->srq_real_sizes.srq_wr_sz = (1 << log_srq_size); 376 srq->srq_real_sizes.srq_sgl_sz = srq->srq_wq_sgl; 377 378 /* 379 * Put SRQ handle in Hermon SRQNum-to-SRQhdl list. Then fill in the 380 * "srqhdl" and return success 381 */ 382 hermon_icm_set_num_to_hdl(state, HERMON_SRQC, srqc->hr_indx, srq); 383 384 /* 385 * If this is a user-mappable SRQ, then we need to insert the 386 * previously allocated entry into the "userland resources database". 387 * This will allow for later lookup during devmap() (i.e. mmap()) 388 * calls. 389 */ 390 if (srq->srq_is_umap) { 391 hermon_umap_db_add(umapdb); 392 } else { /* initialize work queue for kernel SRQs */ 393 int i, len, last; 394 uint16_t *desc; 395 396 desc = (uint16_t *)buf; 397 len = wqesz / sizeof (*desc); 398 last = srq->srq_wq_bufsz - 1; 399 for (i = 0; i < last; i++) { 400 desc[1] = htons(i + 1); 401 desc += len; 402 } 403 srq->srq_wq_wqhdr->wq_tail = last; 404 srq->srq_wq_wqhdr->wq_head = 0; 405 } 406 407 *srqhdl = srq; 408 409 return (status); 410 411 /* 412 * The following is cleanup for all possible failure cases in this routine 413 */ 414 srqalloc_fail8: 415 hermon_wrid_wqhdr_destroy(srq->srq_wq_wqhdr); 416 srqalloc_fail7: 417 if (hermon_mr_deregister(state, &mr, HERMON_MR_DEREG_ALL, 418 HERMON_SLEEPFLAG_FOR_CONTEXT()) != DDI_SUCCESS) { 419 HERMON_WARNING(state, "failed to deregister SRQ memory"); 420 } 421 srqalloc_fail5: 422 hermon_queue_free(&srq->srq_wqinfo); 423 srqalloc_fail4a: 424 hermon_dbr_free(state, uarpg, srq->srq_wq_vdbr); 425 srqalloc_fail4: 426 if (srq_is_umap) { 427 hermon_umap_db_free(umapdb); 428 } 429 srqalloc_fail3: 430 hermon_rsrc_free(state, &rsrc); 431 srqalloc_fail2: 432 hermon_rsrc_free(state, &srqc); 433 srqalloc_fail1: 434 hermon_pd_refcnt_dec(pd); 435 srqalloc_fail: 436 return (status); 437 } 438 439 440 /* 441 * hermon_srq_free() 442 * Context: Can be called only from user or kernel context. 443 */ 444 /* ARGSUSED */ 445 int 446 hermon_srq_free(hermon_state_t *state, hermon_srqhdl_t *srqhdl, 447 uint_t sleepflag) 448 { 449 hermon_rsrc_t *srqc, *rsrc; 450 hermon_umap_db_entry_t *umapdb; 451 uint64_t value; 452 hermon_srqhdl_t srq; 453 hermon_mrhdl_t mr; 454 hermon_pdhdl_t pd; 455 hermon_hw_srqc_t srqc_entry; 456 uint32_t srqnum; 457 uint_t maxprot; 458 int status; 459 460 /* 461 * Pull all the necessary information from the Hermon Shared Receive 462 * Queue handle. This is necessary here because the resource for the 463 * SRQ handle is going to be freed up as part of this operation. 464 */ 465 srq = *srqhdl; 466 mutex_enter(&srq->srq_lock); 467 srqc = srq->srq_srqcrsrcp; 468 rsrc = srq->srq_rsrcp; 469 pd = srq->srq_pdhdl; 470 mr = srq->srq_mrhdl; 471 srqnum = srq->srq_srqnum; 472 473 /* 474 * If there are work queues still associated with the SRQ, then return 475 * an error. Otherwise, we will be holding the SRQ lock. 476 */ 477 if (srq->srq_refcnt != 0) { 478 mutex_exit(&srq->srq_lock); 479 return (IBT_SRQ_IN_USE); 480 } 481 482 /* 483 * If this was a user-mappable SRQ, then we need to remove its entry 484 * from the "userland resources database". If it is also currently 485 * mmap()'d out to a user process, then we need to call 486 * devmap_devmem_remap() to remap the SRQ memory to an invalid mapping. 487 * We also need to invalidate the SRQ tracking information for the 488 * user mapping. 489 */ 490 if (srq->srq_is_umap) { 491 status = hermon_umap_db_find(state->hs_instance, 492 srq->srq_srqnum, MLNX_UMAP_SRQMEM_RSRC, &value, 493 HERMON_UMAP_DB_REMOVE, &umapdb); 494 if (status != DDI_SUCCESS) { 495 mutex_exit(&srq->srq_lock); 496 HERMON_WARNING(state, "failed to find in database"); 497 return (ibc_get_ci_failure(0)); 498 } 499 hermon_umap_db_free(umapdb); 500 if (srq->srq_umap_dhp != NULL) { 501 maxprot = (PROT_READ | PROT_WRITE | PROT_USER); 502 status = devmap_devmem_remap(srq->srq_umap_dhp, 503 state->hs_dip, 0, 0, srq->srq_wqinfo.qa_size, 504 maxprot, DEVMAP_MAPPING_INVALID, NULL); 505 if (status != DDI_SUCCESS) { 506 mutex_exit(&srq->srq_lock); 507 HERMON_WARNING(state, "failed in SRQ memory " 508 "devmap_devmem_remap()"); 509 return (ibc_get_ci_failure(0)); 510 } 511 srq->srq_umap_dhp = (devmap_cookie_t)NULL; 512 } 513 } 514 515 /* 516 * Put NULL into the Hermon SRQNum-to-SRQHdl list. This will allow any 517 * in-progress events to detect that the SRQ corresponding to this 518 * number has been freed. 519 */ 520 hermon_icm_set_num_to_hdl(state, HERMON_SRQC, srqc->hr_indx, NULL); 521 522 mutex_exit(&srq->srq_lock); 523 _NOTE(NOW_INVISIBLE_TO_OTHER_THREADS(*srq)); 524 525 /* 526 * Reclaim SRQC entry from hardware (using the Hermon HW2SW_SRQ 527 * firmware command). If the ownership transfer fails for any reason, 528 * then it is an indication that something (either in HW or SW) has 529 * gone seriously wrong. 530 */ 531 status = hermon_cmn_ownership_cmd_post(state, HW2SW_SRQ, &srqc_entry, 532 sizeof (hermon_hw_srqc_t), srqnum, sleepflag); 533 if (status != HERMON_CMD_SUCCESS) { 534 HERMON_WARNING(state, "failed to reclaim SRQC ownership"); 535 cmn_err(CE_CONT, "Hermon: HW2SW_SRQ command failed: %08x\n", 536 status); 537 if (status == HERMON_CMD_INVALID_STATUS) { 538 hermon_fm_ereport(state, HCA_SYS_ERR, HCA_ERR_SRV_LOST); 539 } 540 return (ibc_get_ci_failure(0)); 541 } 542 543 /* 544 * Deregister the memory for the Shared Receive Queue. If this fails 545 * for any reason, then it is an indication that something (either 546 * in HW or SW) has gone seriously wrong. So we print a warning 547 * message and return. 548 */ 549 status = hermon_mr_deregister(state, &mr, HERMON_MR_DEREG_ALL, 550 sleepflag); 551 if (status != DDI_SUCCESS) { 552 HERMON_WARNING(state, "failed to deregister SRQ memory"); 553 return (IBT_FAILURE); 554 } 555 556 hermon_wrid_wqhdr_destroy(srq->srq_wq_wqhdr); 557 558 /* Free the memory for the SRQ */ 559 hermon_queue_free(&srq->srq_wqinfo); 560 561 /* Free the dbr */ 562 hermon_dbr_free(state, srq->srq_uarpg, srq->srq_wq_vdbr); 563 564 /* Free the Hermon SRQ Handle */ 565 hermon_rsrc_free(state, &rsrc); 566 567 /* Free the SRQC entry resource */ 568 hermon_rsrc_free(state, &srqc); 569 570 /* Decrement the reference count on the protection domain (PD) */ 571 hermon_pd_refcnt_dec(pd); 572 573 /* Set the srqhdl pointer to NULL and return success */ 574 *srqhdl = NULL; 575 576 return (DDI_SUCCESS); 577 } 578 579 580 /* 581 * hermon_srq_modify() 582 * Context: Can be called only from user or kernel context. 583 */ 584 int 585 hermon_srq_modify(hermon_state_t *state, hermon_srqhdl_t srq, uint_t size, 586 uint_t *real_size, uint_t sleepflag) 587 { 588 hermon_qalloc_info_t new_srqinfo, old_srqinfo; 589 hermon_rsrc_t *mtt, *old_mtt; 590 hermon_bind_info_t bind; 591 hermon_bind_info_t old_bind; 592 hermon_mrhdl_t mr; 593 hermon_hw_srqc_t srqc_entry; 594 hermon_hw_dmpt_t mpt_entry; 595 uint64_t *wre_new, *wre_old; 596 uint64_t mtt_addr; 597 uint64_t srq_pgoffs; 598 uint64_t srq_desc_off; 599 uint32_t *buf, srq_old_bufsz; 600 uint32_t wqesz; 601 uint_t max_srq_size; 602 uint_t mtt_pgsize_bits; 603 uint_t log_srq_size, maxprot; 604 int status; 605 606 if ((state->hs_devlim.mod_wr_srq == 0) || 607 (state->hs_cfg_profile->cp_srq_resize_enabled == 0)) 608 return (IBT_NOT_SUPPORTED); 609 610 /* 611 * If size requested is larger than device capability, return 612 * Insufficient Resources 613 */ 614 max_srq_size = (1 << state->hs_cfg_profile->cp_log_max_srq_sz); 615 if (size > max_srq_size) { 616 return (IBT_HCA_WR_EXCEEDED); 617 } 618 619 /* 620 * Calculate the appropriate size for the SRQ. 621 * Note: All Hermon SRQs must be a power-of-2 in size. Also 622 * they may not be any smaller than HERMON_SRQ_MIN_SIZE. This step 623 * is to round the requested size up to the next highest power-of-2 624 */ 625 size = max(size, HERMON_SRQ_MIN_SIZE); 626 log_srq_size = highbit(size); 627 if (ISP2(size)) { 628 log_srq_size = log_srq_size - 1; 629 } 630 631 /* 632 * Next we verify that the rounded-up size is valid (i.e. consistent 633 * with the device limits and/or software-configured limits). 634 */ 635 if (log_srq_size > state->hs_cfg_profile->cp_log_max_srq_sz) { 636 status = IBT_HCA_WR_EXCEEDED; 637 goto srqmodify_fail; 638 } 639 640 /* 641 * Allocate the memory for newly resized Shared Receive Queue. 642 * 643 * Note: If SRQ is not user-mappable, then it may come from either 644 * kernel system memory or from HCA-attached local DDR memory. 645 * 646 * Note2: We align this queue on a pagesize boundary. This is required 647 * to make sure that all the resulting IB addresses will start at 0, 648 * for a zero-based queue. By making sure we are aligned on at least a 649 * page, any offset we use into our queue will be the same as it was 650 * when we allocated it at hermon_srq_alloc() time. 651 */ 652 wqesz = (1 << srq->srq_wq_log_wqesz); 653 new_srqinfo.qa_size = (1 << log_srq_size) * wqesz; 654 new_srqinfo.qa_alloc_align = PAGESIZE; 655 new_srqinfo.qa_bind_align = PAGESIZE; 656 if (srq->srq_is_umap) { 657 new_srqinfo.qa_location = HERMON_QUEUE_LOCATION_USERLAND; 658 } else { 659 new_srqinfo.qa_location = HERMON_QUEUE_LOCATION_NORMAL; 660 } 661 status = hermon_queue_alloc(state, &new_srqinfo, sleepflag); 662 if (status != DDI_SUCCESS) { 663 status = IBT_INSUFF_RESOURCE; 664 goto srqmodify_fail; 665 } 666 buf = (uint32_t *)new_srqinfo.qa_buf_aligned; 667 _NOTE(NOW_INVISIBLE_TO_OTHER_THREADS(*buf)) 668 669 /* 670 * Allocate the memory for the new WRE list. This will be used later 671 * when we resize the wridlist based on the new SRQ size. 672 */ 673 wre_new = kmem_zalloc((1 << log_srq_size) * sizeof (uint64_t), 674 sleepflag); 675 if (wre_new == NULL) { 676 status = IBT_INSUFF_RESOURCE; 677 goto srqmodify_fail; 678 } 679 680 /* 681 * Fill in the "bind" struct. This struct provides the majority 682 * of the information that will be used to distinguish between an 683 * "addr" binding (as is the case here) and a "buf" binding (see 684 * below). The "bind" struct is later passed to hermon_mr_mem_bind() 685 * which does most of the "heavy lifting" for the Hermon memory 686 * registration routines. 687 */ 688 _NOTE(NOW_INVISIBLE_TO_OTHER_THREADS(bind)) 689 bzero(&bind, sizeof (hermon_bind_info_t)); 690 bind.bi_type = HERMON_BINDHDL_VADDR; 691 bind.bi_addr = (uint64_t)(uintptr_t)buf; 692 bind.bi_len = new_srqinfo.qa_size; 693 bind.bi_as = NULL; 694 bind.bi_flags = sleepflag == HERMON_SLEEP ? IBT_MR_SLEEP : 695 IBT_MR_NOSLEEP | IBT_MR_ENABLE_LOCAL_WRITE; 696 bind.bi_bypass = state->hs_cfg_profile->cp_iommu_bypass; 697 698 status = hermon_mr_mtt_bind(state, &bind, new_srqinfo.qa_dmahdl, &mtt, 699 &mtt_pgsize_bits, 0); /* no relaxed ordering */ 700 if (status != DDI_SUCCESS) { 701 status = status; 702 kmem_free(wre_new, (1 << log_srq_size) * 703 sizeof (uint64_t)); 704 hermon_queue_free(&new_srqinfo); 705 goto srqmodify_fail; 706 } 707 708 /* 709 * Calculate the offset between the kernel virtual address space 710 * and the IB virtual address space. This will be used when 711 * posting work requests to properly initialize each WQE. 712 * 713 * Note: bind addr is zero-based (from alloc) so we calculate the 714 * correct new offset here. 715 */ 716 bind.bi_addr = bind.bi_addr & ((1 << mtt_pgsize_bits) - 1); 717 srq_desc_off = (uint64_t)(uintptr_t)new_srqinfo.qa_buf_aligned - 718 (uint64_t)bind.bi_addr; 719 srq_pgoffs = (uint_t) 720 ((uintptr_t)new_srqinfo.qa_buf_aligned & HERMON_PAGEOFFSET); 721 722 /* 723 * Fill in the MPT entry. This is the final step before passing 724 * ownership of the MPT entry to the Hermon hardware. We use all of 725 * the information collected/calculated above to fill in the 726 * requisite portions of the MPT. 727 */ 728 bzero(&mpt_entry, sizeof (hermon_hw_dmpt_t)); 729 mpt_entry.reg_win_len = bind.bi_len; 730 mtt_addr = (mtt->hr_indx << HERMON_MTT_SIZE_SHIFT); 731 mpt_entry.mtt_addr_h = mtt_addr >> 32; 732 mpt_entry.mtt_addr_l = mtt_addr >> 3; 733 734 /* 735 * for hermon we build up a new srqc and pass that (partially filled 736 * to resize SRQ instead of modifying the (d)mpt directly 737 */ 738 739 740 741 /* 742 * Now we grab the SRQ lock. Since we will be updating the actual 743 * SRQ location and the producer/consumer indexes, we should hold 744 * the lock. 745 * 746 * We do a HERMON_NOSLEEP here (and below), though, because we are 747 * holding the "srq_lock" and if we got raised to interrupt level 748 * by priority inversion, we would not want to block in this routine 749 * waiting for success. 750 */ 751 mutex_enter(&srq->srq_lock); 752 753 /* 754 * Copy old entries to new buffer 755 */ 756 srq_old_bufsz = srq->srq_wq_bufsz; 757 bcopy(srq->srq_wq_buf, buf, srq_old_bufsz * wqesz); 758 759 /* 760 * Setup MPT information for use in the MODIFY_MPT command 761 */ 762 mr = srq->srq_mrhdl; 763 mutex_enter(&mr->mr_lock); 764 765 /* 766 * now, setup the srqc information needed for resize - limit the 767 * values, but use the same structure as the srqc 768 */ 769 770 srqc_entry.log_srq_size = log_srq_size; 771 srqc_entry.page_offs = srq_pgoffs >> 6; 772 srqc_entry.log2_pgsz = mr->mr_log2_pgsz; 773 srqc_entry.mtt_base_addrl = (uint64_t)mtt_addr >> 32; 774 srqc_entry.mtt_base_addrh = mtt_addr >> 3; 775 776 /* 777 * RESIZE_SRQ 778 * 779 * If this fails for any reason, then it is an indication that 780 * something (either in HW or SW) has gone seriously wrong. So we 781 * print a warning message and return. 782 */ 783 status = hermon_resize_srq_cmd_post(state, &srqc_entry, 784 srq->srq_srqnum, sleepflag); 785 if (status != HERMON_CMD_SUCCESS) { 786 cmn_err(CE_CONT, "Hermon: RESIZE_SRQ command failed: %08x\n", 787 status); 788 if (status == HERMON_CMD_INVALID_STATUS) { 789 hermon_fm_ereport(state, HCA_SYS_ERR, HCA_ERR_SRV_LOST); 790 } 791 (void) hermon_mr_mtt_unbind(state, &bind, mtt); 792 kmem_free(wre_new, (1 << log_srq_size) * 793 sizeof (uint64_t)); 794 hermon_queue_free(&new_srqinfo); 795 mutex_exit(&mr->mr_lock); 796 mutex_exit(&srq->srq_lock); 797 return (ibc_get_ci_failure(0)); 798 } 799 /* 800 * Update the Hermon Shared Receive Queue handle with all the new 801 * information. At the same time, save away all the necessary 802 * information for freeing up the old resources 803 */ 804 old_srqinfo = srq->srq_wqinfo; 805 old_mtt = srq->srq_mrhdl->mr_mttrsrcp; 806 bcopy(&srq->srq_mrhdl->mr_bindinfo, &old_bind, 807 sizeof (hermon_bind_info_t)); 808 809 /* Now set the new info */ 810 srq->srq_wqinfo = new_srqinfo; 811 srq->srq_wq_buf = buf; 812 srq->srq_wq_bufsz = (1 << log_srq_size); 813 bcopy(&bind, &srq->srq_mrhdl->mr_bindinfo, sizeof (hermon_bind_info_t)); 814 srq->srq_mrhdl->mr_mttrsrcp = mtt; 815 srq->srq_desc_off = srq_desc_off; 816 srq->srq_real_sizes.srq_wr_sz = (1 << log_srq_size); 817 818 /* Update MR mtt pagesize */ 819 mr->mr_logmttpgsz = mtt_pgsize_bits; 820 mutex_exit(&mr->mr_lock); 821 822 /* 823 * Initialize new wridlist, if needed. 824 * 825 * If a wridlist already is setup on an SRQ (the QP associated with an 826 * SRQ has moved "from_reset") then we must update this wridlist based 827 * on the new SRQ size. We allocate the new size of Work Request ID 828 * Entries, copy over the old entries to the new list, and 829 * re-initialize the srq wridlist in non-umap case 830 */ 831 wre_old = srq->srq_wq_wqhdr->wq_wrid; 832 833 bcopy(wre_old, wre_new, srq_old_bufsz * sizeof (uint64_t)); 834 835 /* Setup new sizes in wre */ 836 srq->srq_wq_wqhdr->wq_wrid = wre_new; 837 838 /* 839 * If "old" SRQ was a user-mappable SRQ that is currently mmap()'d out 840 * to a user process, then we need to call devmap_devmem_remap() to 841 * invalidate the mapping to the SRQ memory. We also need to 842 * invalidate the SRQ tracking information for the user mapping. 843 * 844 * Note: On failure, the remap really shouldn't ever happen. So, if it 845 * does, it is an indication that something has gone seriously wrong. 846 * So we print a warning message and return error (knowing, of course, 847 * that the "old" SRQ memory will be leaked) 848 */ 849 if ((srq->srq_is_umap) && (srq->srq_umap_dhp != NULL)) { 850 maxprot = (PROT_READ | PROT_WRITE | PROT_USER); 851 status = devmap_devmem_remap(srq->srq_umap_dhp, 852 state->hs_dip, 0, 0, srq->srq_wqinfo.qa_size, maxprot, 853 DEVMAP_MAPPING_INVALID, NULL); 854 if (status != DDI_SUCCESS) { 855 mutex_exit(&srq->srq_lock); 856 HERMON_WARNING(state, "failed in SRQ memory " 857 "devmap_devmem_remap()"); 858 /* We can, however, free the memory for old wre */ 859 kmem_free(wre_old, srq_old_bufsz * sizeof (uint64_t)); 860 return (ibc_get_ci_failure(0)); 861 } 862 srq->srq_umap_dhp = (devmap_cookie_t)NULL; 863 } 864 865 /* 866 * Drop the SRQ lock now. The only thing left to do is to free up 867 * the old resources. 868 */ 869 mutex_exit(&srq->srq_lock); 870 871 /* 872 * Unbind the MTT entries. 873 */ 874 status = hermon_mr_mtt_unbind(state, &old_bind, old_mtt); 875 if (status != DDI_SUCCESS) { 876 HERMON_WARNING(state, "failed to unbind old SRQ memory"); 877 status = ibc_get_ci_failure(0); 878 goto srqmodify_fail; 879 } 880 881 /* Free the memory for old wre */ 882 kmem_free(wre_old, srq_old_bufsz * sizeof (uint64_t)); 883 884 /* Free the memory for the old SRQ */ 885 hermon_queue_free(&old_srqinfo); 886 887 /* 888 * Fill in the return arguments (if necessary). This includes the 889 * real new completion queue size. 890 */ 891 if (real_size != NULL) { 892 *real_size = (1 << log_srq_size); 893 } 894 895 return (DDI_SUCCESS); 896 897 srqmodify_fail: 898 return (status); 899 } 900 901 902 /* 903 * hermon_srq_refcnt_inc() 904 * Context: Can be called from interrupt or base context. 905 */ 906 void 907 hermon_srq_refcnt_inc(hermon_srqhdl_t srq) 908 { 909 mutex_enter(&srq->srq_lock); 910 srq->srq_refcnt++; 911 mutex_exit(&srq->srq_lock); 912 } 913 914 915 /* 916 * hermon_srq_refcnt_dec() 917 * Context: Can be called from interrupt or base context. 918 */ 919 void 920 hermon_srq_refcnt_dec(hermon_srqhdl_t srq) 921 { 922 mutex_enter(&srq->srq_lock); 923 srq->srq_refcnt--; 924 mutex_exit(&srq->srq_lock); 925 } 926 927 928 /* 929 * hermon_srqhdl_from_srqnum() 930 * Context: Can be called from interrupt or base context. 931 * 932 * This routine is important because changing the unconstrained 933 * portion of the SRQ number is critical to the detection of a 934 * potential race condition in the SRQ handler code (i.e. the case 935 * where a SRQ is freed and alloc'd again before an event for the 936 * "old" SRQ can be handled). 937 * 938 * While this is not a perfect solution (not sure that one exists) 939 * it does help to mitigate the chance that this race condition will 940 * cause us to deliver a "stale" event to the new SRQ owner. Note: 941 * this solution does not scale well because the number of constrained 942 * bits increases (and, hence, the number of unconstrained bits 943 * decreases) as the number of supported SRQ grows. For small and 944 * intermediate values, it should hopefully provide sufficient 945 * protection. 946 */ 947 hermon_srqhdl_t 948 hermon_srqhdl_from_srqnum(hermon_state_t *state, uint_t srqnum) 949 { 950 uint_t srqindx, srqmask; 951 952 /* Calculate the SRQ table index from the srqnum */ 953 srqmask = (1 << state->hs_cfg_profile->cp_log_num_srq) - 1; 954 srqindx = srqnum & srqmask; 955 return (hermon_icm_num_to_hdl(state, HERMON_SRQC, srqindx)); 956 } 957 958 959 /* 960 * hermon_srq_sgl_to_logwqesz() 961 * Context: Can be called from interrupt or base context. 962 */ 963 static void 964 hermon_srq_sgl_to_logwqesz(hermon_state_t *state, uint_t num_sgl, 965 hermon_qp_wq_type_t wq_type, uint_t *logwqesz, uint_t *max_sgl) 966 { 967 uint_t max_size, log2, actual_sgl; 968 969 switch (wq_type) { 970 case HERMON_QP_WQ_TYPE_RECVQ: 971 /* 972 * Use requested maximum SGL to calculate max descriptor size 973 * (while guaranteeing that the descriptor size is a 974 * power-of-2 cachelines). 975 */ 976 max_size = (HERMON_QP_WQE_MLX_SRQ_HDRS + (num_sgl << 4)); 977 log2 = highbit(max_size); 978 if (ISP2(max_size)) { 979 log2 = log2 - 1; 980 } 981 982 /* Make sure descriptor is at least the minimum size */ 983 log2 = max(log2, HERMON_QP_WQE_LOG_MINIMUM); 984 985 /* Calculate actual number of SGL (given WQE size) */ 986 actual_sgl = ((1 << log2) - HERMON_QP_WQE_MLX_SRQ_HDRS) >> 4; 987 break; 988 989 default: 990 HERMON_WARNING(state, "unexpected work queue type"); 991 break; 992 } 993 994 /* Fill in the return values */ 995 *logwqesz = log2; 996 *max_sgl = min(state->hs_cfg_profile->cp_srq_max_sgl, actual_sgl); 997 } 998