1 /* 2 * Copyright (c) 2009-2010 Chelsio, Inc. All rights reserved. 3 * 4 * This software is available to you under a choice of one of two 5 * licenses. You may choose to be licensed under the terms of the GNU 6 * General Public License (GPL) Version 2, available from the file 7 * COPYING in the main directory of this source tree, or the 8 * OpenIB.org BSD license below: 9 * 10 * Redistribution and use in source and binary forms, with or 11 * without modification, are permitted provided that the following 12 * conditions are met: 13 * 14 * - Redistributions of source code must retain the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer. 17 * 18 * - Redistributions in binary form must reproduce the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer in the documentation and/or other materials 21 * provided with the distribution. 22 * 23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 30 * SOFTWARE. 31 */ 32 33 #include "iw_cxgb4.h" 34 35 static int destroy_cq(struct c4iw_rdev *rdev, struct t4_cq *cq, 36 struct c4iw_dev_ucontext *uctx) 37 { 38 struct fw_ri_res_wr *res_wr; 39 struct fw_ri_res *res; 40 int wr_len; 41 struct c4iw_wr_wait wr_wait; 42 struct sk_buff *skb; 43 int ret; 44 45 wr_len = sizeof *res_wr + sizeof *res; 46 skb = alloc_skb(wr_len, GFP_KERNEL); 47 if (!skb) 48 return -ENOMEM; 49 set_wr_txq(skb, CPL_PRIORITY_CONTROL, 0); 50 51 res_wr = (struct fw_ri_res_wr *)__skb_put(skb, wr_len); 52 memset(res_wr, 0, wr_len); 53 res_wr->op_nres = cpu_to_be32( 54 FW_WR_OP(FW_RI_RES_WR) | 55 V_FW_RI_RES_WR_NRES(1) | 56 FW_WR_COMPL(1)); 57 res_wr->len16_pkd = cpu_to_be32(DIV_ROUND_UP(wr_len, 16)); 58 res_wr->cookie = (unsigned long) &wr_wait; 59 res = res_wr->res; 60 res->u.cq.restype = FW_RI_RES_TYPE_CQ; 61 res->u.cq.op = FW_RI_RES_OP_RESET; 62 res->u.cq.iqid = cpu_to_be32(cq->cqid); 63 64 c4iw_init_wr_wait(&wr_wait); 65 ret = c4iw_ofld_send(rdev, skb); 66 if (!ret) { 67 ret = c4iw_wait_for_reply(rdev, &wr_wait, 0, 0, __func__); 68 } 69 70 kfree(cq->sw_queue); 71 dma_free_coherent(&(rdev->lldi.pdev->dev), 72 cq->memsize, cq->queue, 73 dma_unmap_addr(cq, mapping)); 74 c4iw_put_cqid(rdev, cq->cqid, uctx); 75 return ret; 76 } 77 78 static int create_cq(struct c4iw_rdev *rdev, struct t4_cq *cq, 79 struct c4iw_dev_ucontext *uctx) 80 { 81 struct fw_ri_res_wr *res_wr; 82 struct fw_ri_res *res; 83 int wr_len; 84 int user = (uctx != &rdev->uctx); 85 struct c4iw_wr_wait wr_wait; 86 int ret; 87 struct sk_buff *skb; 88 89 cq->cqid = c4iw_get_cqid(rdev, uctx); 90 if (!cq->cqid) { 91 ret = -ENOMEM; 92 goto err1; 93 } 94 95 if (!user) { 96 cq->sw_queue = kzalloc(cq->memsize, GFP_KERNEL); 97 if (!cq->sw_queue) { 98 ret = -ENOMEM; 99 goto err2; 100 } 101 } 102 cq->queue = dma_alloc_coherent(&rdev->lldi.pdev->dev, cq->memsize, 103 &cq->dma_addr, GFP_KERNEL); 104 if (!cq->queue) { 105 ret = -ENOMEM; 106 goto err3; 107 } 108 dma_unmap_addr_set(cq, mapping, cq->dma_addr); 109 memset(cq->queue, 0, cq->memsize); 110 111 /* build fw_ri_res_wr */ 112 wr_len = sizeof *res_wr + sizeof *res; 113 114 skb = alloc_skb(wr_len, GFP_KERNEL); 115 if (!skb) { 116 ret = -ENOMEM; 117 goto err4; 118 } 119 set_wr_txq(skb, CPL_PRIORITY_CONTROL, 0); 120 121 res_wr = (struct fw_ri_res_wr *)__skb_put(skb, wr_len); 122 memset(res_wr, 0, wr_len); 123 res_wr->op_nres = cpu_to_be32( 124 FW_WR_OP(FW_RI_RES_WR) | 125 V_FW_RI_RES_WR_NRES(1) | 126 FW_WR_COMPL(1)); 127 res_wr->len16_pkd = cpu_to_be32(DIV_ROUND_UP(wr_len, 16)); 128 res_wr->cookie = (unsigned long) &wr_wait; 129 res = res_wr->res; 130 res->u.cq.restype = FW_RI_RES_TYPE_CQ; 131 res->u.cq.op = FW_RI_RES_OP_WRITE; 132 res->u.cq.iqid = cpu_to_be32(cq->cqid); 133 res->u.cq.iqandst_to_iqandstindex = cpu_to_be32( 134 V_FW_RI_RES_WR_IQANUS(0) | 135 V_FW_RI_RES_WR_IQANUD(1) | 136 F_FW_RI_RES_WR_IQANDST | 137 V_FW_RI_RES_WR_IQANDSTINDEX( 138 rdev->lldi.ciq_ids[cq->vector])); 139 res->u.cq.iqdroprss_to_iqesize = cpu_to_be16( 140 F_FW_RI_RES_WR_IQDROPRSS | 141 V_FW_RI_RES_WR_IQPCIECH(2) | 142 V_FW_RI_RES_WR_IQINTCNTTHRESH(0) | 143 F_FW_RI_RES_WR_IQO | 144 V_FW_RI_RES_WR_IQESIZE(1)); 145 res->u.cq.iqsize = cpu_to_be16(cq->size); 146 res->u.cq.iqaddr = cpu_to_be64(cq->dma_addr); 147 148 c4iw_init_wr_wait(&wr_wait); 149 150 ret = c4iw_ofld_send(rdev, skb); 151 if (ret) 152 goto err4; 153 PDBG("%s wait_event wr_wait %p\n", __func__, &wr_wait); 154 ret = c4iw_wait_for_reply(rdev, &wr_wait, 0, 0, __func__); 155 if (ret) 156 goto err4; 157 158 cq->gen = 1; 159 cq->gts = rdev->lldi.gts_reg; 160 cq->rdev = rdev; 161 if (user) { 162 cq->ugts = (u64)pci_resource_start(rdev->lldi.pdev, 2) + 163 (cq->cqid << rdev->cqshift); 164 cq->ugts &= PAGE_MASK; 165 } 166 return 0; 167 err4: 168 dma_free_coherent(&rdev->lldi.pdev->dev, cq->memsize, cq->queue, 169 dma_unmap_addr(cq, mapping)); 170 err3: 171 kfree(cq->sw_queue); 172 err2: 173 c4iw_put_cqid(rdev, cq->cqid, uctx); 174 err1: 175 return ret; 176 } 177 178 static void insert_recv_cqe(struct t4_wq *wq, struct t4_cq *cq) 179 { 180 struct t4_cqe cqe; 181 182 PDBG("%s wq %p cq %p sw_cidx %u sw_pidx %u\n", __func__, 183 wq, cq, cq->sw_cidx, cq->sw_pidx); 184 memset(&cqe, 0, sizeof(cqe)); 185 cqe.header = cpu_to_be32(V_CQE_STATUS(T4_ERR_SWFLUSH) | 186 V_CQE_OPCODE(FW_RI_SEND) | 187 V_CQE_TYPE(0) | 188 V_CQE_SWCQE(1) | 189 V_CQE_QPID(wq->sq.qid)); 190 cqe.bits_type_ts = cpu_to_be64(V_CQE_GENBIT((u64)cq->gen)); 191 cq->sw_queue[cq->sw_pidx] = cqe; 192 t4_swcq_produce(cq); 193 } 194 195 int c4iw_flush_rq(struct t4_wq *wq, struct t4_cq *cq, int count) 196 { 197 int flushed = 0; 198 int in_use = wq->rq.in_use - count; 199 200 BUG_ON(in_use < 0); 201 PDBG("%s wq %p cq %p rq.in_use %u skip count %u\n", __func__, 202 wq, cq, wq->rq.in_use, count); 203 while (in_use--) { 204 insert_recv_cqe(wq, cq); 205 flushed++; 206 } 207 return flushed; 208 } 209 210 static void insert_sq_cqe(struct t4_wq *wq, struct t4_cq *cq, 211 struct t4_swsqe *swcqe) 212 { 213 struct t4_cqe cqe; 214 215 PDBG("%s wq %p cq %p sw_cidx %u sw_pidx %u\n", __func__, 216 wq, cq, cq->sw_cidx, cq->sw_pidx); 217 memset(&cqe, 0, sizeof(cqe)); 218 cqe.header = cpu_to_be32(V_CQE_STATUS(T4_ERR_SWFLUSH) | 219 V_CQE_OPCODE(swcqe->opcode) | 220 V_CQE_TYPE(1) | 221 V_CQE_SWCQE(1) | 222 V_CQE_QPID(wq->sq.qid)); 223 CQE_WRID_SQ_IDX(&cqe) = swcqe->idx; 224 cqe.bits_type_ts = cpu_to_be64(V_CQE_GENBIT((u64)cq->gen)); 225 cq->sw_queue[cq->sw_pidx] = cqe; 226 t4_swcq_produce(cq); 227 } 228 229 static void advance_oldest_read(struct t4_wq *wq); 230 231 int c4iw_flush_sq(struct c4iw_qp *qhp) 232 { 233 int flushed = 0; 234 struct t4_wq *wq = &qhp->wq; 235 struct c4iw_cq *chp = to_c4iw_cq(qhp->ibqp.send_cq); 236 struct t4_cq *cq = &chp->cq; 237 int idx; 238 struct t4_swsqe *swsqe; 239 240 if (wq->sq.flush_cidx == -1) 241 wq->sq.flush_cidx = wq->sq.cidx; 242 idx = wq->sq.flush_cidx; 243 BUG_ON(idx >= wq->sq.size); 244 while (idx != wq->sq.pidx) { 245 swsqe = &wq->sq.sw_sq[idx]; 246 BUG_ON(swsqe->flushed); 247 swsqe->flushed = 1; 248 insert_sq_cqe(wq, cq, swsqe); 249 if (wq->sq.oldest_read == swsqe) { 250 BUG_ON(swsqe->opcode != FW_RI_READ_REQ); 251 advance_oldest_read(wq); 252 } 253 flushed++; 254 if (++idx == wq->sq.size) 255 idx = 0; 256 } 257 wq->sq.flush_cidx += flushed; 258 if (wq->sq.flush_cidx >= wq->sq.size) 259 wq->sq.flush_cidx -= wq->sq.size; 260 return flushed; 261 } 262 263 static void flush_completed_wrs(struct t4_wq *wq, struct t4_cq *cq) 264 { 265 struct t4_swsqe *swsqe; 266 int cidx; 267 268 if (wq->sq.flush_cidx == -1) 269 wq->sq.flush_cidx = wq->sq.cidx; 270 cidx = wq->sq.flush_cidx; 271 BUG_ON(cidx > wq->sq.size); 272 273 while (cidx != wq->sq.pidx) { 274 swsqe = &wq->sq.sw_sq[cidx]; 275 if (!swsqe->signaled) { 276 if (++cidx == wq->sq.size) 277 cidx = 0; 278 } else if (swsqe->complete) { 279 280 BUG_ON(swsqe->flushed); 281 282 /* 283 * Insert this completed cqe into the swcq. 284 */ 285 PDBG("%s moving cqe into swcq sq idx %u cq idx %u\n", 286 __func__, cidx, cq->sw_pidx); 287 swsqe->cqe.header |= htonl(V_CQE_SWCQE(1)); 288 cq->sw_queue[cq->sw_pidx] = swsqe->cqe; 289 t4_swcq_produce(cq); 290 swsqe->flushed = 1; 291 if (++cidx == wq->sq.size) 292 cidx = 0; 293 wq->sq.flush_cidx = cidx; 294 } else 295 break; 296 } 297 } 298 299 static void create_read_req_cqe(struct t4_wq *wq, struct t4_cqe *hw_cqe, 300 struct t4_cqe *read_cqe) 301 { 302 read_cqe->u.scqe.cidx = wq->sq.oldest_read->idx; 303 read_cqe->len = htonl(wq->sq.oldest_read->read_len); 304 read_cqe->header = htonl(V_CQE_QPID(CQE_QPID(hw_cqe)) | 305 V_CQE_SWCQE(SW_CQE(hw_cqe)) | 306 V_CQE_OPCODE(FW_RI_READ_REQ) | 307 V_CQE_TYPE(1)); 308 read_cqe->bits_type_ts = hw_cqe->bits_type_ts; 309 } 310 311 static void advance_oldest_read(struct t4_wq *wq) 312 { 313 314 u32 rptr = wq->sq.oldest_read - wq->sq.sw_sq + 1; 315 316 if (rptr == wq->sq.size) 317 rptr = 0; 318 while (rptr != wq->sq.pidx) { 319 wq->sq.oldest_read = &wq->sq.sw_sq[rptr]; 320 321 if (wq->sq.oldest_read->opcode == FW_RI_READ_REQ) 322 return; 323 if (++rptr == wq->sq.size) 324 rptr = 0; 325 } 326 wq->sq.oldest_read = NULL; 327 } 328 329 /* 330 * Move all CQEs from the HWCQ into the SWCQ. 331 * Deal with out-of-order and/or completions that complete 332 * prior unsignalled WRs. 333 */ 334 void c4iw_flush_hw_cq(struct c4iw_cq *chp) 335 { 336 struct t4_cqe *hw_cqe, *swcqe, read_cqe; 337 struct c4iw_qp *qhp; 338 struct t4_swsqe *swsqe; 339 int ret; 340 341 PDBG("%s cqid 0x%x\n", __func__, chp->cq.cqid); 342 ret = t4_next_hw_cqe(&chp->cq, &hw_cqe); 343 344 /* 345 * This logic is similar to poll_cq(), but not quite the same 346 * unfortunately. Need to move pertinent HW CQEs to the SW CQ but 347 * also do any translation magic that poll_cq() normally does. 348 */ 349 while (!ret) { 350 qhp = get_qhp(chp->rhp, CQE_QPID(hw_cqe)); 351 352 /* 353 * drop CQEs with no associated QP 354 */ 355 if (qhp == NULL) 356 goto next_cqe; 357 358 if (CQE_OPCODE(hw_cqe) == FW_RI_TERMINATE) 359 goto next_cqe; 360 361 if (CQE_OPCODE(hw_cqe) == FW_RI_READ_RESP) { 362 363 /* If we have reached here because of async 364 * event or other error, and have egress error 365 * then drop 366 */ 367 if (CQE_TYPE(hw_cqe) == 1) 368 goto next_cqe; 369 370 /* drop peer2peer RTR reads. 371 */ 372 if (CQE_WRID_STAG(hw_cqe) == 1) 373 goto next_cqe; 374 375 /* 376 * Eat completions for unsignaled read WRs. 377 */ 378 if (!qhp->wq.sq.oldest_read->signaled) { 379 advance_oldest_read(&qhp->wq); 380 goto next_cqe; 381 } 382 383 /* 384 * Don't write to the HWCQ, create a new read req CQE 385 * in local memory and move it into the swcq. 386 */ 387 create_read_req_cqe(&qhp->wq, hw_cqe, &read_cqe); 388 hw_cqe = &read_cqe; 389 advance_oldest_read(&qhp->wq); 390 } 391 392 /* if its a SQ completion, then do the magic to move all the 393 * unsignaled and now in-order completions into the swcq. 394 */ 395 if (SQ_TYPE(hw_cqe)) { 396 swsqe = &qhp->wq.sq.sw_sq[CQE_WRID_SQ_IDX(hw_cqe)]; 397 swsqe->cqe = *hw_cqe; 398 swsqe->complete = 1; 399 flush_completed_wrs(&qhp->wq, &chp->cq); 400 } else { 401 swcqe = &chp->cq.sw_queue[chp->cq.sw_pidx]; 402 *swcqe = *hw_cqe; 403 swcqe->header |= cpu_to_be32(V_CQE_SWCQE(1)); 404 t4_swcq_produce(&chp->cq); 405 } 406 next_cqe: 407 t4_hwcq_consume(&chp->cq); 408 ret = t4_next_hw_cqe(&chp->cq, &hw_cqe); 409 } 410 } 411 412 static int cqe_completes_wr(struct t4_cqe *cqe, struct t4_wq *wq) 413 { 414 if (CQE_OPCODE(cqe) == FW_RI_TERMINATE) 415 return 0; 416 417 if ((CQE_OPCODE(cqe) == FW_RI_RDMA_WRITE) && RQ_TYPE(cqe)) 418 return 0; 419 420 if ((CQE_OPCODE(cqe) == FW_RI_READ_RESP) && SQ_TYPE(cqe)) 421 return 0; 422 423 if (CQE_SEND_OPCODE(cqe) && RQ_TYPE(cqe) && t4_rq_empty(wq)) 424 return 0; 425 return 1; 426 } 427 428 void c4iw_count_rcqes(struct t4_cq *cq, struct t4_wq *wq, int *count) 429 { 430 struct t4_cqe *cqe; 431 u32 ptr; 432 433 *count = 0; 434 PDBG("%s count zero %d\n", __func__, *count); 435 ptr = cq->sw_cidx; 436 while (ptr != cq->sw_pidx) { 437 cqe = &cq->sw_queue[ptr]; 438 if (RQ_TYPE(cqe) && (CQE_OPCODE(cqe) != FW_RI_READ_RESP) && 439 (CQE_QPID(cqe) == wq->sq.qid) && cqe_completes_wr(cqe, wq)) 440 (*count)++; 441 if (++ptr == cq->size) 442 ptr = 0; 443 } 444 PDBG("%s cq %p count %d\n", __func__, cq, *count); 445 } 446 447 /* 448 * poll_cq 449 * 450 * Caller must: 451 * check the validity of the first CQE, 452 * supply the wq assicated with the qpid. 453 * 454 * credit: cq credit to return to sge. 455 * cqe_flushed: 1 iff the CQE is flushed. 456 * cqe: copy of the polled CQE. 457 * 458 * return value: 459 * 0 CQE returned ok. 460 * -EAGAIN CQE skipped, try again. 461 * -EOVERFLOW CQ overflow detected. 462 */ 463 static int poll_cq(struct t4_wq *wq, struct t4_cq *cq, struct t4_cqe *cqe, 464 u8 *cqe_flushed, u64 *cookie, u32 *credit) 465 { 466 int ret = 0; 467 struct t4_cqe *hw_cqe, read_cqe; 468 469 *cqe_flushed = 0; 470 *credit = 0; 471 ret = t4_next_cqe(cq, &hw_cqe); 472 if (ret) 473 return ret; 474 475 PDBG("%s CQE OVF %u qpid 0x%0x genbit %u type %u status 0x%0x" 476 " opcode 0x%0x len 0x%0x wrid_hi_stag 0x%x wrid_low_msn 0x%x\n", 477 __func__, CQE_OVFBIT(hw_cqe), CQE_QPID(hw_cqe), 478 CQE_GENBIT(hw_cqe), CQE_TYPE(hw_cqe), CQE_STATUS(hw_cqe), 479 CQE_OPCODE(hw_cqe), CQE_LEN(hw_cqe), CQE_WRID_HI(hw_cqe), 480 CQE_WRID_LOW(hw_cqe)); 481 482 /* 483 * skip cqe's not affiliated with a QP. 484 */ 485 if (wq == NULL) { 486 ret = -EAGAIN; 487 goto skip_cqe; 488 } 489 490 /* 491 * skip hw cqe's if the wq is flushed. 492 */ 493 if (wq->flushed && !SW_CQE(hw_cqe)) { 494 ret = -EAGAIN; 495 goto skip_cqe; 496 } 497 498 /* 499 * skip TERMINATE cqes... 500 */ 501 if (CQE_OPCODE(hw_cqe) == FW_RI_TERMINATE) { 502 ret = -EAGAIN; 503 goto skip_cqe; 504 } 505 506 /* 507 * Gotta tweak READ completions: 508 * 1) the cqe doesn't contain the sq_wptr from the wr. 509 * 2) opcode not reflected from the wr. 510 * 3) read_len not reflected from the wr. 511 * 4) cq_type is RQ_TYPE not SQ_TYPE. 512 */ 513 if (RQ_TYPE(hw_cqe) && (CQE_OPCODE(hw_cqe) == FW_RI_READ_RESP)) { 514 515 /* If we have reached here because of async 516 * event or other error, and have egress error 517 * then drop 518 */ 519 if (CQE_TYPE(hw_cqe) == 1) { 520 if (CQE_STATUS(hw_cqe)) 521 t4_set_wq_in_error(wq); 522 ret = -EAGAIN; 523 goto skip_cqe; 524 } 525 526 /* If this is an unsolicited read response, then the read 527 * was generated by the kernel driver as part of peer-2-peer 528 * connection setup. So ignore the completion. 529 */ 530 if (CQE_WRID_STAG(hw_cqe) == 1) { 531 if (CQE_STATUS(hw_cqe)) 532 t4_set_wq_in_error(wq); 533 ret = -EAGAIN; 534 goto skip_cqe; 535 } 536 537 /* 538 * Eat completions for unsignaled read WRs. 539 */ 540 if (!wq->sq.oldest_read->signaled) { 541 advance_oldest_read(wq); 542 ret = -EAGAIN; 543 goto skip_cqe; 544 } 545 546 /* 547 * Don't write to the HWCQ, so create a new read req CQE 548 * in local memory. 549 */ 550 create_read_req_cqe(wq, hw_cqe, &read_cqe); 551 hw_cqe = &read_cqe; 552 advance_oldest_read(wq); 553 } 554 555 if (CQE_STATUS(hw_cqe) || t4_wq_in_error(wq)) { 556 *cqe_flushed = (CQE_STATUS(hw_cqe) == T4_ERR_SWFLUSH); 557 t4_set_wq_in_error(wq); 558 } 559 560 /* 561 * RECV completion. 562 */ 563 if (RQ_TYPE(hw_cqe)) { 564 565 /* 566 * HW only validates 4 bits of MSN. So we must validate that 567 * the MSN in the SEND is the next expected MSN. If its not, 568 * then we complete this with T4_ERR_MSN and mark the wq in 569 * error. 570 */ 571 572 if (t4_rq_empty(wq)) { 573 t4_set_wq_in_error(wq); 574 ret = -EAGAIN; 575 goto skip_cqe; 576 } 577 if (unlikely((CQE_WRID_MSN(hw_cqe) != (wq->rq.msn)))) { 578 t4_set_wq_in_error(wq); 579 hw_cqe->header |= htonl(V_CQE_STATUS(T4_ERR_MSN)); 580 goto proc_cqe; 581 } 582 goto proc_cqe; 583 } 584 585 /* 586 * If we get here its a send completion. 587 * 588 * Handle out of order completion. These get stuffed 589 * in the SW SQ. Then the SW SQ is walked to move any 590 * now in-order completions into the SW CQ. This handles 591 * 2 cases: 592 * 1) reaping unsignaled WRs when the first subsequent 593 * signaled WR is completed. 594 * 2) out of order read completions. 595 */ 596 if (!SW_CQE(hw_cqe) && (CQE_WRID_SQ_IDX(hw_cqe) != wq->sq.cidx)) { 597 struct t4_swsqe *swsqe; 598 599 PDBG("%s out of order completion going in sw_sq at idx %u\n", 600 __func__, CQE_WRID_SQ_IDX(hw_cqe)); 601 swsqe = &wq->sq.sw_sq[CQE_WRID_SQ_IDX(hw_cqe)]; 602 swsqe->cqe = *hw_cqe; 603 swsqe->complete = 1; 604 ret = -EAGAIN; 605 goto flush_wq; 606 } 607 608 proc_cqe: 609 *cqe = *hw_cqe; 610 611 /* 612 * Reap the associated WR(s) that are freed up with this 613 * completion. 614 */ 615 if (SQ_TYPE(hw_cqe)) { 616 int idx = CQE_WRID_SQ_IDX(hw_cqe); 617 BUG_ON(idx >= wq->sq.size); 618 619 /* 620 * Account for any unsignaled completions completed by 621 * this signaled completion. In this case, cidx points 622 * to the first unsignaled one, and idx points to the 623 * signaled one. So adjust in_use based on this delta. 624 * if this is not completing any unsigned wrs, then the 625 * delta will be 0. Handle wrapping also! 626 */ 627 if (idx < wq->sq.cidx) 628 wq->sq.in_use -= wq->sq.size + idx - wq->sq.cidx; 629 else 630 wq->sq.in_use -= idx - wq->sq.cidx; 631 BUG_ON(wq->sq.in_use <= 0 && wq->sq.in_use >= wq->sq.size); 632 633 wq->sq.cidx = (uint16_t)idx; 634 PDBG("%s completing sq idx %u\n", __func__, wq->sq.cidx); 635 *cookie = wq->sq.sw_sq[wq->sq.cidx].wr_id; 636 if (c4iw_wr_log) 637 c4iw_log_wr_stats(wq, hw_cqe); 638 t4_sq_consume(wq); 639 } else { 640 PDBG("%s completing rq idx %u\n", __func__, wq->rq.cidx); 641 *cookie = wq->rq.sw_rq[wq->rq.cidx].wr_id; 642 BUG_ON(t4_rq_empty(wq)); 643 if (c4iw_wr_log) 644 c4iw_log_wr_stats(wq, hw_cqe); 645 t4_rq_consume(wq); 646 goto skip_cqe; 647 } 648 649 flush_wq: 650 /* 651 * Flush any completed cqes that are now in-order. 652 */ 653 flush_completed_wrs(wq, cq); 654 655 skip_cqe: 656 if (SW_CQE(hw_cqe)) { 657 PDBG("%s cq %p cqid 0x%x skip sw cqe cidx %u\n", 658 __func__, cq, cq->cqid, cq->sw_cidx); 659 t4_swcq_consume(cq); 660 } else { 661 PDBG("%s cq %p cqid 0x%x skip hw cqe cidx %u\n", 662 __func__, cq, cq->cqid, cq->cidx); 663 t4_hwcq_consume(cq); 664 } 665 return ret; 666 } 667 668 /* 669 * Get one cq entry from c4iw and map it to openib. 670 * 671 * Returns: 672 * 0 cqe returned 673 * -ENODATA EMPTY; 674 * -EAGAIN caller must try again 675 * any other -errno fatal error 676 */ 677 static int c4iw_poll_cq_one(struct c4iw_cq *chp, struct ib_wc *wc) 678 { 679 struct c4iw_qp *qhp = NULL; 680 struct t4_cqe uninitialized_var(cqe), *rd_cqe; 681 struct t4_wq *wq; 682 u32 credit = 0; 683 u8 cqe_flushed; 684 u64 cookie = 0; 685 int ret; 686 687 ret = t4_next_cqe(&chp->cq, &rd_cqe); 688 689 if (ret) 690 return ret; 691 692 qhp = get_qhp(chp->rhp, CQE_QPID(rd_cqe)); 693 if (!qhp) 694 wq = NULL; 695 else { 696 spin_lock(&qhp->lock); 697 wq = &(qhp->wq); 698 } 699 ret = poll_cq(wq, &(chp->cq), &cqe, &cqe_flushed, &cookie, &credit); 700 if (ret) 701 goto out; 702 703 wc->wr_id = cookie; 704 wc->qp = &qhp->ibqp; 705 wc->vendor_err = CQE_STATUS(&cqe); 706 wc->wc_flags = 0; 707 708 PDBG("%s qpid 0x%x type %d opcode %d status 0x%x len %u wrid hi 0x%x " 709 "lo 0x%x cookie 0x%llx\n", __func__, CQE_QPID(&cqe), 710 CQE_TYPE(&cqe), CQE_OPCODE(&cqe), CQE_STATUS(&cqe), CQE_LEN(&cqe), 711 CQE_WRID_HI(&cqe), CQE_WRID_LOW(&cqe), (unsigned long long)cookie); 712 713 if (CQE_TYPE(&cqe) == 0) { 714 if (!CQE_STATUS(&cqe)) 715 wc->byte_len = CQE_LEN(&cqe); 716 else 717 wc->byte_len = 0; 718 wc->opcode = IB_WC_RECV; 719 if (CQE_OPCODE(&cqe) == FW_RI_SEND_WITH_INV || 720 CQE_OPCODE(&cqe) == FW_RI_SEND_WITH_SE_INV) { 721 wc->ex.invalidate_rkey = CQE_WRID_STAG(&cqe); 722 wc->wc_flags |= IB_WC_WITH_INVALIDATE; 723 } 724 } else { 725 switch (CQE_OPCODE(&cqe)) { 726 case FW_RI_RDMA_WRITE: 727 wc->opcode = IB_WC_RDMA_WRITE; 728 break; 729 case FW_RI_READ_REQ: 730 wc->opcode = IB_WC_RDMA_READ; 731 wc->byte_len = CQE_LEN(&cqe); 732 break; 733 case FW_RI_SEND_WITH_INV: 734 case FW_RI_SEND_WITH_SE_INV: 735 wc->opcode = IB_WC_SEND; 736 wc->wc_flags |= IB_WC_WITH_INVALIDATE; 737 break; 738 case FW_RI_SEND: 739 case FW_RI_SEND_WITH_SE: 740 wc->opcode = IB_WC_SEND; 741 break; 742 case FW_RI_BIND_MW: 743 wc->opcode = IB_WC_BIND_MW; 744 break; 745 746 case FW_RI_LOCAL_INV: 747 wc->opcode = IB_WC_LOCAL_INV; 748 break; 749 case FW_RI_FAST_REGISTER: 750 wc->opcode = IB_WC_FAST_REG_MR; 751 break; 752 default: 753 printk(KERN_ERR MOD "Unexpected opcode %d " 754 "in the CQE received for QPID=0x%0x\n", 755 CQE_OPCODE(&cqe), CQE_QPID(&cqe)); 756 ret = -EINVAL; 757 goto out; 758 } 759 } 760 761 if (cqe_flushed) 762 wc->status = IB_WC_WR_FLUSH_ERR; 763 else { 764 765 switch (CQE_STATUS(&cqe)) { 766 case T4_ERR_SUCCESS: 767 wc->status = IB_WC_SUCCESS; 768 break; 769 case T4_ERR_STAG: 770 wc->status = IB_WC_LOC_ACCESS_ERR; 771 break; 772 case T4_ERR_PDID: 773 wc->status = IB_WC_LOC_PROT_ERR; 774 break; 775 case T4_ERR_QPID: 776 case T4_ERR_ACCESS: 777 wc->status = IB_WC_LOC_ACCESS_ERR; 778 break; 779 case T4_ERR_WRAP: 780 wc->status = IB_WC_GENERAL_ERR; 781 break; 782 case T4_ERR_BOUND: 783 wc->status = IB_WC_LOC_LEN_ERR; 784 break; 785 case T4_ERR_INVALIDATE_SHARED_MR: 786 case T4_ERR_INVALIDATE_MR_WITH_MW_BOUND: 787 wc->status = IB_WC_MW_BIND_ERR; 788 break; 789 case T4_ERR_CRC: 790 case T4_ERR_MARKER: 791 case T4_ERR_PDU_LEN_ERR: 792 case T4_ERR_OUT_OF_RQE: 793 case T4_ERR_DDP_VERSION: 794 case T4_ERR_RDMA_VERSION: 795 case T4_ERR_DDP_QUEUE_NUM: 796 case T4_ERR_MSN: 797 case T4_ERR_TBIT: 798 case T4_ERR_MO: 799 case T4_ERR_MSN_RANGE: 800 case T4_ERR_IRD_OVERFLOW: 801 case T4_ERR_OPCODE: 802 case T4_ERR_INTERNAL_ERR: 803 wc->status = IB_WC_FATAL_ERR; 804 break; 805 case T4_ERR_SWFLUSH: 806 wc->status = IB_WC_WR_FLUSH_ERR; 807 break; 808 default: 809 printk(KERN_ERR MOD 810 "Unexpected cqe_status 0x%x for QPID=0x%0x\n", 811 CQE_STATUS(&cqe), CQE_QPID(&cqe)); 812 ret = -EINVAL; 813 } 814 } 815 out: 816 if (wq) 817 spin_unlock(&qhp->lock); 818 return ret; 819 } 820 821 int c4iw_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc) 822 { 823 struct c4iw_cq *chp; 824 unsigned long flags; 825 int npolled; 826 int err = 0; 827 828 chp = to_c4iw_cq(ibcq); 829 830 spin_lock_irqsave(&chp->lock, flags); 831 for (npolled = 0; npolled < num_entries; ++npolled) { 832 do { 833 err = c4iw_poll_cq_one(chp, wc + npolled); 834 } while (err == -EAGAIN); 835 if (err) 836 break; 837 } 838 spin_unlock_irqrestore(&chp->lock, flags); 839 return !err || err == -ENODATA ? npolled : err; 840 } 841 842 int c4iw_destroy_cq(struct ib_cq *ib_cq) 843 { 844 struct c4iw_cq *chp; 845 struct c4iw_ucontext *ucontext; 846 847 PDBG("%s ib_cq %p\n", __func__, ib_cq); 848 chp = to_c4iw_cq(ib_cq); 849 850 remove_handle(chp->rhp, &chp->rhp->cqidr, chp->cq.cqid); 851 atomic_dec(&chp->refcnt); 852 wait_event(chp->wait, !atomic_read(&chp->refcnt)); 853 854 ucontext = ib_cq->uobject ? to_c4iw_ucontext(ib_cq->uobject->context) 855 : NULL; 856 destroy_cq(&chp->rhp->rdev, &chp->cq, 857 ucontext ? &ucontext->uctx : &chp->cq.rdev->uctx); 858 kfree(chp); 859 return 0; 860 } 861 862 struct ib_cq *c4iw_create_cq(struct ib_device *ibdev, int entries, 863 int vector, struct ib_ucontext *ib_context, 864 struct ib_udata *udata) 865 { 866 struct c4iw_dev *rhp; 867 struct c4iw_cq *chp; 868 struct c4iw_create_cq_resp uresp; 869 struct c4iw_ucontext *ucontext = NULL; 870 int ret; 871 size_t memsize, hwentries; 872 struct c4iw_mm_entry *mm, *mm2; 873 874 PDBG("%s ib_dev %p entries %d\n", __func__, ibdev, entries); 875 876 rhp = to_c4iw_dev(ibdev); 877 878 if (vector >= rhp->rdev.lldi.nciq) 879 return ERR_PTR(-EINVAL); 880 881 chp = kzalloc(sizeof(*chp), GFP_KERNEL); 882 if (!chp) 883 return ERR_PTR(-ENOMEM); 884 885 if (ib_context) 886 ucontext = to_c4iw_ucontext(ib_context); 887 888 /* account for the status page. */ 889 entries++; 890 891 /* IQ needs one extra entry to differentiate full vs empty. */ 892 entries++; 893 894 /* 895 * entries must be multiple of 16 for HW. 896 */ 897 entries = roundup(entries, 16); 898 899 /* 900 * Make actual HW queue 2x to avoid cdix_inc overflows. 901 */ 902 hwentries = min(entries * 2, rhp->rdev.hw_queue.t4_max_iq_size); 903 904 /* 905 * Make HW queue at least 64 entries so GTS updates aren't too 906 * frequent. 907 */ 908 if (hwentries < 64) 909 hwentries = 64; 910 911 memsize = hwentries * sizeof *chp->cq.queue; 912 913 /* 914 * memsize must be a multiple of the page size if its a user cq. 915 */ 916 if (ucontext) 917 memsize = roundup(memsize, PAGE_SIZE); 918 chp->cq.size = hwentries; 919 chp->cq.memsize = memsize; 920 chp->cq.vector = vector; 921 922 ret = create_cq(&rhp->rdev, &chp->cq, 923 ucontext ? &ucontext->uctx : &rhp->rdev.uctx); 924 if (ret) 925 goto err1; 926 927 chp->rhp = rhp; 928 chp->cq.size--; /* status page */ 929 chp->ibcq.cqe = entries - 2; 930 spin_lock_init(&chp->lock); 931 spin_lock_init(&chp->comp_handler_lock); 932 atomic_set(&chp->refcnt, 1); 933 init_waitqueue_head(&chp->wait); 934 ret = insert_handle(rhp, &rhp->cqidr, chp, chp->cq.cqid); 935 if (ret) 936 goto err2; 937 938 if (ucontext) { 939 mm = kmalloc(sizeof *mm, GFP_KERNEL); 940 if (!mm) 941 goto err3; 942 mm2 = kmalloc(sizeof *mm2, GFP_KERNEL); 943 if (!mm2) 944 goto err4; 945 946 uresp.qid_mask = rhp->rdev.cqmask; 947 uresp.cqid = chp->cq.cqid; 948 uresp.size = chp->cq.size; 949 uresp.memsize = chp->cq.memsize; 950 spin_lock(&ucontext->mmap_lock); 951 uresp.key = ucontext->key; 952 ucontext->key += PAGE_SIZE; 953 uresp.gts_key = ucontext->key; 954 ucontext->key += PAGE_SIZE; 955 spin_unlock(&ucontext->mmap_lock); 956 ret = ib_copy_to_udata(udata, &uresp, 957 sizeof(uresp) - sizeof(uresp.reserved)); 958 if (ret) 959 goto err5; 960 961 mm->key = uresp.key; 962 mm->addr = virt_to_phys(chp->cq.queue); 963 mm->len = chp->cq.memsize; 964 insert_mmap(ucontext, mm); 965 966 mm2->key = uresp.gts_key; 967 mm2->addr = chp->cq.ugts; 968 mm2->len = PAGE_SIZE; 969 insert_mmap(ucontext, mm2); 970 } 971 PDBG("%s cqid 0x%0x chp %p size %u memsize %zu, dma_addr 0x%0llx\n", 972 __func__, chp->cq.cqid, chp, chp->cq.size, 973 chp->cq.memsize, 974 (unsigned long long) chp->cq.dma_addr); 975 return &chp->ibcq; 976 err5: 977 kfree(mm2); 978 err4: 979 kfree(mm); 980 err3: 981 remove_handle(rhp, &rhp->cqidr, chp->cq.cqid); 982 err2: 983 destroy_cq(&chp->rhp->rdev, &chp->cq, 984 ucontext ? &ucontext->uctx : &rhp->rdev.uctx); 985 err1: 986 kfree(chp); 987 return ERR_PTR(ret); 988 } 989 990 int c4iw_resize_cq(struct ib_cq *cq, int cqe, struct ib_udata *udata) 991 { 992 return -ENOSYS; 993 } 994 995 int c4iw_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags flags) 996 { 997 struct c4iw_cq *chp; 998 int ret; 999 unsigned long flag; 1000 1001 chp = to_c4iw_cq(ibcq); 1002 spin_lock_irqsave(&chp->lock, flag); 1003 ret = t4_arm_cq(&chp->cq, 1004 (flags & IB_CQ_SOLICITED_MASK) == IB_CQ_SOLICITED); 1005 spin_unlock_irqrestore(&chp->lock, flag); 1006 if (ret && !(flags & IB_CQ_REPORT_MISSED_EVENTS)) 1007 ret = 0; 1008 return ret; 1009 } 1010