1 /* 2 * Copyright (c) 2004, 2005 Topspin Communications. All rights reserved. 3 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved. 4 * Copyright (c) 2005, 2006 Cisco Systems, Inc. All rights reserved. 5 * Copyright (c) 2005 Mellanox Technologies. All rights reserved. 6 * Copyright (c) 2004 Voltaire, Inc. All rights reserved. 7 * 8 * This software is available to you under a choice of one of two 9 * licenses. You may choose to be licensed under the terms of the GNU 10 * General Public License (GPL) Version 2, available from the file 11 * COPYING in the main directory of this source tree, or the 12 * OpenIB.org BSD license below: 13 * 14 * Redistribution and use in source and binary forms, with or 15 * without modification, are permitted provided that the following 16 * conditions are met: 17 * 18 * - Redistributions of source code must retain the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer. 21 * 22 * - Redistributions in binary form must reproduce the above 23 * copyright notice, this list of conditions and the following 24 * disclaimer in the documentation and/or other materials 25 * provided with the distribution. 26 * 27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 28 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 29 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 30 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 31 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 32 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 33 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 34 * SOFTWARE. 35 */ 36 37 #include <linux/gfp.h> 38 #include <linux/hardirq.h> 39 #include <linux/sched.h> 40 41 #include <asm/io.h> 42 43 #include <rdma/ib_pack.h> 44 45 #include "mthca_dev.h" 46 #include "mthca_cmd.h" 47 #include "mthca_memfree.h" 48 49 enum { 50 MTHCA_MAX_DIRECT_CQ_SIZE = 4 * PAGE_SIZE 51 }; 52 53 enum { 54 MTHCA_CQ_ENTRY_SIZE = 0x20 55 }; 56 57 enum { 58 MTHCA_ATOMIC_BYTE_LEN = 8 59 }; 60 61 /* 62 * Must be packed because start is 64 bits but only aligned to 32 bits. 63 */ 64 struct mthca_cq_context { 65 __be32 flags; 66 __be64 start; 67 __be32 logsize_usrpage; 68 __be32 error_eqn; /* Tavor only */ 69 __be32 comp_eqn; 70 __be32 pd; 71 __be32 lkey; 72 __be32 last_notified_index; 73 __be32 solicit_producer_index; 74 __be32 consumer_index; 75 __be32 producer_index; 76 __be32 cqn; 77 __be32 ci_db; /* Arbel only */ 78 __be32 state_db; /* Arbel only */ 79 u32 reserved; 80 } __packed; 81 82 #define MTHCA_CQ_STATUS_OK ( 0 << 28) 83 #define MTHCA_CQ_STATUS_OVERFLOW ( 9 << 28) 84 #define MTHCA_CQ_STATUS_WRITE_FAIL (10 << 28) 85 #define MTHCA_CQ_FLAG_TR ( 1 << 18) 86 #define MTHCA_CQ_FLAG_OI ( 1 << 17) 87 #define MTHCA_CQ_STATE_DISARMED ( 0 << 8) 88 #define MTHCA_CQ_STATE_ARMED ( 1 << 8) 89 #define MTHCA_CQ_STATE_ARMED_SOL ( 4 << 8) 90 #define MTHCA_EQ_STATE_FIRED (10 << 8) 91 92 enum { 93 MTHCA_ERROR_CQE_OPCODE_MASK = 0xfe 94 }; 95 96 enum { 97 SYNDROME_LOCAL_LENGTH_ERR = 0x01, 98 SYNDROME_LOCAL_QP_OP_ERR = 0x02, 99 SYNDROME_LOCAL_EEC_OP_ERR = 0x03, 100 SYNDROME_LOCAL_PROT_ERR = 0x04, 101 SYNDROME_WR_FLUSH_ERR = 0x05, 102 SYNDROME_MW_BIND_ERR = 0x06, 103 SYNDROME_BAD_RESP_ERR = 0x10, 104 SYNDROME_LOCAL_ACCESS_ERR = 0x11, 105 SYNDROME_REMOTE_INVAL_REQ_ERR = 0x12, 106 SYNDROME_REMOTE_ACCESS_ERR = 0x13, 107 SYNDROME_REMOTE_OP_ERR = 0x14, 108 SYNDROME_RETRY_EXC_ERR = 0x15, 109 SYNDROME_RNR_RETRY_EXC_ERR = 0x16, 110 SYNDROME_LOCAL_RDD_VIOL_ERR = 0x20, 111 SYNDROME_REMOTE_INVAL_RD_REQ_ERR = 0x21, 112 SYNDROME_REMOTE_ABORTED_ERR = 0x22, 113 SYNDROME_INVAL_EECN_ERR = 0x23, 114 SYNDROME_INVAL_EEC_STATE_ERR = 0x24 115 }; 116 117 struct mthca_cqe { 118 __be32 my_qpn; 119 __be32 my_ee; 120 __be32 rqpn; 121 u8 sl_ipok; 122 u8 g_mlpath; 123 __be16 rlid; 124 __be32 imm_etype_pkey_eec; 125 __be32 byte_cnt; 126 __be32 wqe; 127 u8 opcode; 128 u8 is_send; 129 u8 reserved; 130 u8 owner; 131 }; 132 133 struct mthca_err_cqe { 134 __be32 my_qpn; 135 u32 reserved1[3]; 136 u8 syndrome; 137 u8 vendor_err; 138 __be16 db_cnt; 139 u32 reserved2; 140 __be32 wqe; 141 u8 opcode; 142 u8 reserved3[2]; 143 u8 owner; 144 }; 145 146 #define MTHCA_CQ_ENTRY_OWNER_SW (0 << 7) 147 #define MTHCA_CQ_ENTRY_OWNER_HW (1 << 7) 148 149 #define MTHCA_TAVOR_CQ_DB_INC_CI (1 << 24) 150 #define MTHCA_TAVOR_CQ_DB_REQ_NOT (2 << 24) 151 #define MTHCA_TAVOR_CQ_DB_REQ_NOT_SOL (3 << 24) 152 #define MTHCA_TAVOR_CQ_DB_SET_CI (4 << 24) 153 #define MTHCA_TAVOR_CQ_DB_REQ_NOT_MULT (5 << 24) 154 155 #define MTHCA_ARBEL_CQ_DB_REQ_NOT_SOL (1 << 24) 156 #define MTHCA_ARBEL_CQ_DB_REQ_NOT (2 << 24) 157 #define MTHCA_ARBEL_CQ_DB_REQ_NOT_MULT (3 << 24) 158 159 static inline struct mthca_cqe *get_cqe_from_buf(struct mthca_cq_buf *buf, 160 int entry) 161 { 162 if (buf->is_direct) 163 return buf->queue.direct.buf + (entry * MTHCA_CQ_ENTRY_SIZE); 164 else 165 return buf->queue.page_list[entry * MTHCA_CQ_ENTRY_SIZE / PAGE_SIZE].buf 166 + (entry * MTHCA_CQ_ENTRY_SIZE) % PAGE_SIZE; 167 } 168 169 static inline struct mthca_cqe *get_cqe(struct mthca_cq *cq, int entry) 170 { 171 return get_cqe_from_buf(&cq->buf, entry); 172 } 173 174 static inline struct mthca_cqe *cqe_sw(struct mthca_cqe *cqe) 175 { 176 return MTHCA_CQ_ENTRY_OWNER_HW & cqe->owner ? NULL : cqe; 177 } 178 179 static inline struct mthca_cqe *next_cqe_sw(struct mthca_cq *cq) 180 { 181 return cqe_sw(get_cqe(cq, cq->cons_index & cq->ibcq.cqe)); 182 } 183 184 static inline void set_cqe_hw(struct mthca_cqe *cqe) 185 { 186 cqe->owner = MTHCA_CQ_ENTRY_OWNER_HW; 187 } 188 189 static void dump_cqe(struct mthca_dev *dev, void *cqe_ptr) 190 { 191 __be32 *cqe = cqe_ptr; 192 193 (void) cqe; /* avoid warning if mthca_dbg compiled away... */ 194 mthca_dbg(dev, "CQE contents %08x %08x %08x %08x %08x %08x %08x %08x\n", 195 be32_to_cpu(cqe[0]), be32_to_cpu(cqe[1]), be32_to_cpu(cqe[2]), 196 be32_to_cpu(cqe[3]), be32_to_cpu(cqe[4]), be32_to_cpu(cqe[5]), 197 be32_to_cpu(cqe[6]), be32_to_cpu(cqe[7])); 198 } 199 200 /* 201 * incr is ignored in native Arbel (mem-free) mode, so cq->cons_index 202 * should be correct before calling update_cons_index(). 203 */ 204 static inline void update_cons_index(struct mthca_dev *dev, struct mthca_cq *cq, 205 int incr) 206 { 207 if (mthca_is_memfree(dev)) { 208 *cq->set_ci_db = cpu_to_be32(cq->cons_index); 209 wmb(); 210 } else { 211 mthca_write64(MTHCA_TAVOR_CQ_DB_INC_CI | cq->cqn, incr - 1, 212 dev->kar + MTHCA_CQ_DOORBELL, 213 MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock)); 214 } 215 } 216 217 void mthca_cq_completion(struct mthca_dev *dev, u32 cqn) 218 { 219 struct mthca_cq *cq; 220 221 cq = mthca_array_get(&dev->cq_table.cq, cqn & (dev->limits.num_cqs - 1)); 222 223 if (!cq) { 224 mthca_warn(dev, "Completion event for bogus CQ %08x\n", cqn); 225 return; 226 } 227 228 ++cq->arm_sn; 229 230 cq->ibcq.comp_handler(&cq->ibcq, cq->ibcq.cq_context); 231 } 232 233 void mthca_cq_event(struct mthca_dev *dev, u32 cqn, 234 enum ib_event_type event_type) 235 { 236 struct mthca_cq *cq; 237 struct ib_event event; 238 239 spin_lock(&dev->cq_table.lock); 240 241 cq = mthca_array_get(&dev->cq_table.cq, cqn & (dev->limits.num_cqs - 1)); 242 if (cq) 243 ++cq->refcount; 244 245 spin_unlock(&dev->cq_table.lock); 246 247 if (!cq) { 248 mthca_warn(dev, "Async event for bogus CQ %08x\n", cqn); 249 return; 250 } 251 252 event.device = &dev->ib_dev; 253 event.event = event_type; 254 event.element.cq = &cq->ibcq; 255 if (cq->ibcq.event_handler) 256 cq->ibcq.event_handler(&event, cq->ibcq.cq_context); 257 258 spin_lock(&dev->cq_table.lock); 259 if (!--cq->refcount) 260 wake_up(&cq->wait); 261 spin_unlock(&dev->cq_table.lock); 262 } 263 264 static inline int is_recv_cqe(struct mthca_cqe *cqe) 265 { 266 if ((cqe->opcode & MTHCA_ERROR_CQE_OPCODE_MASK) == 267 MTHCA_ERROR_CQE_OPCODE_MASK) 268 return !(cqe->opcode & 0x01); 269 else 270 return !(cqe->is_send & 0x80); 271 } 272 273 void mthca_cq_clean(struct mthca_dev *dev, struct mthca_cq *cq, u32 qpn, 274 struct mthca_srq *srq) 275 { 276 struct mthca_cqe *cqe; 277 u32 prod_index; 278 int i, nfreed = 0; 279 280 spin_lock_irq(&cq->lock); 281 282 /* 283 * First we need to find the current producer index, so we 284 * know where to start cleaning from. It doesn't matter if HW 285 * adds new entries after this loop -- the QP we're worried 286 * about is already in RESET, so the new entries won't come 287 * from our QP and therefore don't need to be checked. 288 */ 289 for (prod_index = cq->cons_index; 290 cqe_sw(get_cqe(cq, prod_index & cq->ibcq.cqe)); 291 ++prod_index) 292 if (prod_index == cq->cons_index + cq->ibcq.cqe) 293 break; 294 295 if (0) 296 mthca_dbg(dev, "Cleaning QPN %06x from CQN %06x; ci %d, pi %d\n", 297 qpn, cq->cqn, cq->cons_index, prod_index); 298 299 /* 300 * Now sweep backwards through the CQ, removing CQ entries 301 * that match our QP by copying older entries on top of them. 302 */ 303 while ((int) --prod_index - (int) cq->cons_index >= 0) { 304 cqe = get_cqe(cq, prod_index & cq->ibcq.cqe); 305 if (cqe->my_qpn == cpu_to_be32(qpn)) { 306 if (srq && is_recv_cqe(cqe)) 307 mthca_free_srq_wqe(srq, be32_to_cpu(cqe->wqe)); 308 ++nfreed; 309 } else if (nfreed) 310 memcpy(get_cqe(cq, (prod_index + nfreed) & cq->ibcq.cqe), 311 cqe, MTHCA_CQ_ENTRY_SIZE); 312 } 313 314 if (nfreed) { 315 for (i = 0; i < nfreed; ++i) 316 set_cqe_hw(get_cqe(cq, (cq->cons_index + i) & cq->ibcq.cqe)); 317 wmb(); 318 cq->cons_index += nfreed; 319 update_cons_index(dev, cq, nfreed); 320 } 321 322 spin_unlock_irq(&cq->lock); 323 } 324 325 void mthca_cq_resize_copy_cqes(struct mthca_cq *cq) 326 { 327 int i; 328 329 /* 330 * In Tavor mode, the hardware keeps the consumer and producer 331 * indices mod the CQ size. Since we might be making the CQ 332 * bigger, we need to deal with the case where the producer 333 * index wrapped around before the CQ was resized. 334 */ 335 if (!mthca_is_memfree(to_mdev(cq->ibcq.device)) && 336 cq->ibcq.cqe < cq->resize_buf->cqe) { 337 cq->cons_index &= cq->ibcq.cqe; 338 if (cqe_sw(get_cqe(cq, cq->ibcq.cqe))) 339 cq->cons_index -= cq->ibcq.cqe + 1; 340 } 341 342 for (i = cq->cons_index; cqe_sw(get_cqe(cq, i & cq->ibcq.cqe)); ++i) 343 memcpy(get_cqe_from_buf(&cq->resize_buf->buf, 344 i & cq->resize_buf->cqe), 345 get_cqe(cq, i & cq->ibcq.cqe), MTHCA_CQ_ENTRY_SIZE); 346 } 347 348 int mthca_alloc_cq_buf(struct mthca_dev *dev, struct mthca_cq_buf *buf, int nent) 349 { 350 int ret; 351 int i; 352 353 ret = mthca_buf_alloc(dev, nent * MTHCA_CQ_ENTRY_SIZE, 354 MTHCA_MAX_DIRECT_CQ_SIZE, 355 &buf->queue, &buf->is_direct, 356 &dev->driver_pd, 1, &buf->mr); 357 if (ret) 358 return ret; 359 360 for (i = 0; i < nent; ++i) 361 set_cqe_hw(get_cqe_from_buf(buf, i)); 362 363 return 0; 364 } 365 366 void mthca_free_cq_buf(struct mthca_dev *dev, struct mthca_cq_buf *buf, int cqe) 367 { 368 mthca_buf_free(dev, (cqe + 1) * MTHCA_CQ_ENTRY_SIZE, &buf->queue, 369 buf->is_direct, &buf->mr); 370 } 371 372 static void handle_error_cqe(struct mthca_dev *dev, struct mthca_cq *cq, 373 struct mthca_qp *qp, int wqe_index, int is_send, 374 struct mthca_err_cqe *cqe, 375 struct ib_wc *entry, int *free_cqe) 376 { 377 int dbd; 378 __be32 new_wqe; 379 380 if (cqe->syndrome == SYNDROME_LOCAL_QP_OP_ERR) { 381 mthca_dbg(dev, "local QP operation err " 382 "(QPN %06x, WQE @ %08x, CQN %06x, index %d)\n", 383 be32_to_cpu(cqe->my_qpn), be32_to_cpu(cqe->wqe), 384 cq->cqn, cq->cons_index); 385 dump_cqe(dev, cqe); 386 } 387 388 /* 389 * For completions in error, only work request ID, status, vendor error 390 * (and freed resource count for RD) have to be set. 391 */ 392 switch (cqe->syndrome) { 393 case SYNDROME_LOCAL_LENGTH_ERR: 394 entry->status = IB_WC_LOC_LEN_ERR; 395 break; 396 case SYNDROME_LOCAL_QP_OP_ERR: 397 entry->status = IB_WC_LOC_QP_OP_ERR; 398 break; 399 case SYNDROME_LOCAL_EEC_OP_ERR: 400 entry->status = IB_WC_LOC_EEC_OP_ERR; 401 break; 402 case SYNDROME_LOCAL_PROT_ERR: 403 entry->status = IB_WC_LOC_PROT_ERR; 404 break; 405 case SYNDROME_WR_FLUSH_ERR: 406 entry->status = IB_WC_WR_FLUSH_ERR; 407 break; 408 case SYNDROME_MW_BIND_ERR: 409 entry->status = IB_WC_MW_BIND_ERR; 410 break; 411 case SYNDROME_BAD_RESP_ERR: 412 entry->status = IB_WC_BAD_RESP_ERR; 413 break; 414 case SYNDROME_LOCAL_ACCESS_ERR: 415 entry->status = IB_WC_LOC_ACCESS_ERR; 416 break; 417 case SYNDROME_REMOTE_INVAL_REQ_ERR: 418 entry->status = IB_WC_REM_INV_REQ_ERR; 419 break; 420 case SYNDROME_REMOTE_ACCESS_ERR: 421 entry->status = IB_WC_REM_ACCESS_ERR; 422 break; 423 case SYNDROME_REMOTE_OP_ERR: 424 entry->status = IB_WC_REM_OP_ERR; 425 break; 426 case SYNDROME_RETRY_EXC_ERR: 427 entry->status = IB_WC_RETRY_EXC_ERR; 428 break; 429 case SYNDROME_RNR_RETRY_EXC_ERR: 430 entry->status = IB_WC_RNR_RETRY_EXC_ERR; 431 break; 432 case SYNDROME_LOCAL_RDD_VIOL_ERR: 433 entry->status = IB_WC_LOC_RDD_VIOL_ERR; 434 break; 435 case SYNDROME_REMOTE_INVAL_RD_REQ_ERR: 436 entry->status = IB_WC_REM_INV_RD_REQ_ERR; 437 break; 438 case SYNDROME_REMOTE_ABORTED_ERR: 439 entry->status = IB_WC_REM_ABORT_ERR; 440 break; 441 case SYNDROME_INVAL_EECN_ERR: 442 entry->status = IB_WC_INV_EECN_ERR; 443 break; 444 case SYNDROME_INVAL_EEC_STATE_ERR: 445 entry->status = IB_WC_INV_EEC_STATE_ERR; 446 break; 447 default: 448 entry->status = IB_WC_GENERAL_ERR; 449 break; 450 } 451 452 entry->vendor_err = cqe->vendor_err; 453 454 /* 455 * Mem-free HCAs always generate one CQE per WQE, even in the 456 * error case, so we don't have to check the doorbell count, etc. 457 */ 458 if (mthca_is_memfree(dev)) 459 return; 460 461 mthca_free_err_wqe(dev, qp, is_send, wqe_index, &dbd, &new_wqe); 462 463 /* 464 * If we're at the end of the WQE chain, or we've used up our 465 * doorbell count, free the CQE. Otherwise just update it for 466 * the next poll operation. 467 */ 468 if (!(new_wqe & cpu_to_be32(0x3f)) || (!cqe->db_cnt && dbd)) 469 return; 470 471 be16_add_cpu(&cqe->db_cnt, -dbd); 472 cqe->wqe = new_wqe; 473 cqe->syndrome = SYNDROME_WR_FLUSH_ERR; 474 475 *free_cqe = 0; 476 } 477 478 static inline int mthca_poll_one(struct mthca_dev *dev, 479 struct mthca_cq *cq, 480 struct mthca_qp **cur_qp, 481 int *freed, 482 struct ib_wc *entry) 483 { 484 struct mthca_wq *wq; 485 struct mthca_cqe *cqe; 486 int wqe_index; 487 int is_error; 488 int is_send; 489 int free_cqe = 1; 490 int err = 0; 491 u16 checksum; 492 493 cqe = next_cqe_sw(cq); 494 if (!cqe) 495 return -EAGAIN; 496 497 /* 498 * Make sure we read CQ entry contents after we've checked the 499 * ownership bit. 500 */ 501 rmb(); 502 503 if (0) { 504 mthca_dbg(dev, "%x/%d: CQE -> QPN %06x, WQE @ %08x\n", 505 cq->cqn, cq->cons_index, be32_to_cpu(cqe->my_qpn), 506 be32_to_cpu(cqe->wqe)); 507 dump_cqe(dev, cqe); 508 } 509 510 is_error = (cqe->opcode & MTHCA_ERROR_CQE_OPCODE_MASK) == 511 MTHCA_ERROR_CQE_OPCODE_MASK; 512 is_send = is_error ? cqe->opcode & 0x01 : cqe->is_send & 0x80; 513 514 if (!*cur_qp || be32_to_cpu(cqe->my_qpn) != (*cur_qp)->qpn) { 515 /* 516 * We do not have to take the QP table lock here, 517 * because CQs will be locked while QPs are removed 518 * from the table. 519 */ 520 *cur_qp = mthca_array_get(&dev->qp_table.qp, 521 be32_to_cpu(cqe->my_qpn) & 522 (dev->limits.num_qps - 1)); 523 if (!*cur_qp) { 524 mthca_warn(dev, "CQ entry for unknown QP %06x\n", 525 be32_to_cpu(cqe->my_qpn) & 0xffffff); 526 err = -EINVAL; 527 goto out; 528 } 529 } 530 531 entry->qp = &(*cur_qp)->ibqp; 532 533 if (is_send) { 534 wq = &(*cur_qp)->sq; 535 wqe_index = ((be32_to_cpu(cqe->wqe) - (*cur_qp)->send_wqe_offset) 536 >> wq->wqe_shift); 537 entry->wr_id = (*cur_qp)->wrid[wqe_index + 538 (*cur_qp)->rq.max]; 539 } else if ((*cur_qp)->ibqp.srq) { 540 struct mthca_srq *srq = to_msrq((*cur_qp)->ibqp.srq); 541 u32 wqe = be32_to_cpu(cqe->wqe); 542 wq = NULL; 543 wqe_index = wqe >> srq->wqe_shift; 544 entry->wr_id = srq->wrid[wqe_index]; 545 mthca_free_srq_wqe(srq, wqe); 546 } else { 547 s32 wqe; 548 wq = &(*cur_qp)->rq; 549 wqe = be32_to_cpu(cqe->wqe); 550 wqe_index = wqe >> wq->wqe_shift; 551 /* 552 * WQE addr == base - 1 might be reported in receive completion 553 * with error instead of (rq size - 1) by Sinai FW 1.0.800 and 554 * Arbel FW 5.1.400. This bug should be fixed in later FW revs. 555 */ 556 if (unlikely(wqe_index < 0)) 557 wqe_index = wq->max - 1; 558 entry->wr_id = (*cur_qp)->wrid[wqe_index]; 559 } 560 561 if (wq) { 562 if (wq->last_comp < wqe_index) 563 wq->tail += wqe_index - wq->last_comp; 564 else 565 wq->tail += wqe_index + wq->max - wq->last_comp; 566 567 wq->last_comp = wqe_index; 568 } 569 570 if (is_error) { 571 handle_error_cqe(dev, cq, *cur_qp, wqe_index, is_send, 572 (struct mthca_err_cqe *) cqe, 573 entry, &free_cqe); 574 goto out; 575 } 576 577 if (is_send) { 578 entry->wc_flags = 0; 579 switch (cqe->opcode) { 580 case MTHCA_OPCODE_RDMA_WRITE: 581 entry->opcode = IB_WC_RDMA_WRITE; 582 break; 583 case MTHCA_OPCODE_RDMA_WRITE_IMM: 584 entry->opcode = IB_WC_RDMA_WRITE; 585 entry->wc_flags |= IB_WC_WITH_IMM; 586 break; 587 case MTHCA_OPCODE_SEND: 588 entry->opcode = IB_WC_SEND; 589 break; 590 case MTHCA_OPCODE_SEND_IMM: 591 entry->opcode = IB_WC_SEND; 592 entry->wc_flags |= IB_WC_WITH_IMM; 593 break; 594 case MTHCA_OPCODE_RDMA_READ: 595 entry->opcode = IB_WC_RDMA_READ; 596 entry->byte_len = be32_to_cpu(cqe->byte_cnt); 597 break; 598 case MTHCA_OPCODE_ATOMIC_CS: 599 entry->opcode = IB_WC_COMP_SWAP; 600 entry->byte_len = MTHCA_ATOMIC_BYTE_LEN; 601 break; 602 case MTHCA_OPCODE_ATOMIC_FA: 603 entry->opcode = IB_WC_FETCH_ADD; 604 entry->byte_len = MTHCA_ATOMIC_BYTE_LEN; 605 break; 606 default: 607 entry->opcode = 0xFF; 608 break; 609 } 610 } else { 611 entry->byte_len = be32_to_cpu(cqe->byte_cnt); 612 switch (cqe->opcode & 0x1f) { 613 case IB_OPCODE_SEND_LAST_WITH_IMMEDIATE: 614 case IB_OPCODE_SEND_ONLY_WITH_IMMEDIATE: 615 entry->wc_flags = IB_WC_WITH_IMM; 616 entry->ex.imm_data = cqe->imm_etype_pkey_eec; 617 entry->opcode = IB_WC_RECV; 618 break; 619 case IB_OPCODE_RDMA_WRITE_LAST_WITH_IMMEDIATE: 620 case IB_OPCODE_RDMA_WRITE_ONLY_WITH_IMMEDIATE: 621 entry->wc_flags = IB_WC_WITH_IMM; 622 entry->ex.imm_data = cqe->imm_etype_pkey_eec; 623 entry->opcode = IB_WC_RECV_RDMA_WITH_IMM; 624 break; 625 default: 626 entry->wc_flags = 0; 627 entry->opcode = IB_WC_RECV; 628 break; 629 } 630 entry->slid = be16_to_cpu(cqe->rlid); 631 entry->sl = cqe->sl_ipok >> 4; 632 entry->src_qp = be32_to_cpu(cqe->rqpn) & 0xffffff; 633 entry->dlid_path_bits = cqe->g_mlpath & 0x7f; 634 entry->pkey_index = be32_to_cpu(cqe->imm_etype_pkey_eec) >> 16; 635 entry->wc_flags |= cqe->g_mlpath & 0x80 ? IB_WC_GRH : 0; 636 checksum = (be32_to_cpu(cqe->rqpn) >> 24) | 637 ((be32_to_cpu(cqe->my_ee) >> 16) & 0xff00); 638 entry->wc_flags |= (cqe->sl_ipok & 1 && checksum == 0xffff) ? 639 IB_WC_IP_CSUM_OK : 0; 640 } 641 642 entry->status = IB_WC_SUCCESS; 643 644 out: 645 if (likely(free_cqe)) { 646 set_cqe_hw(cqe); 647 ++(*freed); 648 ++cq->cons_index; 649 } 650 651 return err; 652 } 653 654 int mthca_poll_cq(struct ib_cq *ibcq, int num_entries, 655 struct ib_wc *entry) 656 { 657 struct mthca_dev *dev = to_mdev(ibcq->device); 658 struct mthca_cq *cq = to_mcq(ibcq); 659 struct mthca_qp *qp = NULL; 660 unsigned long flags; 661 int err = 0; 662 int freed = 0; 663 int npolled; 664 665 spin_lock_irqsave(&cq->lock, flags); 666 667 npolled = 0; 668 repoll: 669 while (npolled < num_entries) { 670 err = mthca_poll_one(dev, cq, &qp, 671 &freed, entry + npolled); 672 if (err) 673 break; 674 ++npolled; 675 } 676 677 if (freed) { 678 wmb(); 679 update_cons_index(dev, cq, freed); 680 } 681 682 /* 683 * If a CQ resize is in progress and we discovered that the 684 * old buffer is empty, then peek in the new buffer, and if 685 * it's not empty, switch to the new buffer and continue 686 * polling there. 687 */ 688 if (unlikely(err == -EAGAIN && cq->resize_buf && 689 cq->resize_buf->state == CQ_RESIZE_READY)) { 690 /* 691 * In Tavor mode, the hardware keeps the producer 692 * index modulo the CQ size. Since we might be making 693 * the CQ bigger, we need to mask our consumer index 694 * using the size of the old CQ buffer before looking 695 * in the new CQ buffer. 696 */ 697 if (!mthca_is_memfree(dev)) 698 cq->cons_index &= cq->ibcq.cqe; 699 700 if (cqe_sw(get_cqe_from_buf(&cq->resize_buf->buf, 701 cq->cons_index & cq->resize_buf->cqe))) { 702 struct mthca_cq_buf tbuf; 703 int tcqe; 704 705 tbuf = cq->buf; 706 tcqe = cq->ibcq.cqe; 707 cq->buf = cq->resize_buf->buf; 708 cq->ibcq.cqe = cq->resize_buf->cqe; 709 710 cq->resize_buf->buf = tbuf; 711 cq->resize_buf->cqe = tcqe; 712 cq->resize_buf->state = CQ_RESIZE_SWAPPED; 713 714 goto repoll; 715 } 716 } 717 718 spin_unlock_irqrestore(&cq->lock, flags); 719 720 return err == 0 || err == -EAGAIN ? npolled : err; 721 } 722 723 int mthca_tavor_arm_cq(struct ib_cq *cq, enum ib_cq_notify_flags flags) 724 { 725 u32 dbhi = ((flags & IB_CQ_SOLICITED_MASK) == IB_CQ_SOLICITED ? 726 MTHCA_TAVOR_CQ_DB_REQ_NOT_SOL : 727 MTHCA_TAVOR_CQ_DB_REQ_NOT) | 728 to_mcq(cq)->cqn; 729 730 mthca_write64(dbhi, 0xffffffff, to_mdev(cq->device)->kar + MTHCA_CQ_DOORBELL, 731 MTHCA_GET_DOORBELL_LOCK(&to_mdev(cq->device)->doorbell_lock)); 732 733 return 0; 734 } 735 736 int mthca_arbel_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags flags) 737 { 738 struct mthca_cq *cq = to_mcq(ibcq); 739 __be32 db_rec[2]; 740 u32 dbhi; 741 u32 sn = cq->arm_sn & 3; 742 743 db_rec[0] = cpu_to_be32(cq->cons_index); 744 db_rec[1] = cpu_to_be32((cq->cqn << 8) | (2 << 5) | (sn << 3) | 745 ((flags & IB_CQ_SOLICITED_MASK) == 746 IB_CQ_SOLICITED ? 1 : 2)); 747 748 mthca_write_db_rec(db_rec, cq->arm_db); 749 750 /* 751 * Make sure that the doorbell record in host memory is 752 * written before ringing the doorbell via PCI MMIO. 753 */ 754 wmb(); 755 756 dbhi = (sn << 28) | 757 ((flags & IB_CQ_SOLICITED_MASK) == IB_CQ_SOLICITED ? 758 MTHCA_ARBEL_CQ_DB_REQ_NOT_SOL : 759 MTHCA_ARBEL_CQ_DB_REQ_NOT) | cq->cqn; 760 761 mthca_write64(dbhi, cq->cons_index, 762 to_mdev(ibcq->device)->kar + MTHCA_CQ_DOORBELL, 763 MTHCA_GET_DOORBELL_LOCK(&to_mdev(ibcq->device)->doorbell_lock)); 764 765 return 0; 766 } 767 768 int mthca_init_cq(struct mthca_dev *dev, int nent, 769 struct mthca_ucontext *ctx, u32 pdn, 770 struct mthca_cq *cq) 771 { 772 struct mthca_mailbox *mailbox; 773 struct mthca_cq_context *cq_context; 774 int err = -ENOMEM; 775 776 cq->ibcq.cqe = nent - 1; 777 cq->is_kernel = !ctx; 778 779 cq->cqn = mthca_alloc(&dev->cq_table.alloc); 780 if (cq->cqn == -1) 781 return -ENOMEM; 782 783 if (mthca_is_memfree(dev)) { 784 err = mthca_table_get(dev, dev->cq_table.table, cq->cqn); 785 if (err) 786 goto err_out; 787 788 if (cq->is_kernel) { 789 cq->arm_sn = 1; 790 791 err = -ENOMEM; 792 793 cq->set_ci_db_index = mthca_alloc_db(dev, MTHCA_DB_TYPE_CQ_SET_CI, 794 cq->cqn, &cq->set_ci_db); 795 if (cq->set_ci_db_index < 0) 796 goto err_out_icm; 797 798 cq->arm_db_index = mthca_alloc_db(dev, MTHCA_DB_TYPE_CQ_ARM, 799 cq->cqn, &cq->arm_db); 800 if (cq->arm_db_index < 0) 801 goto err_out_ci; 802 } 803 } 804 805 mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL); 806 if (IS_ERR(mailbox)) { 807 err = PTR_ERR(mailbox); 808 goto err_out_arm; 809 } 810 811 cq_context = mailbox->buf; 812 813 if (cq->is_kernel) { 814 err = mthca_alloc_cq_buf(dev, &cq->buf, nent); 815 if (err) 816 goto err_out_mailbox; 817 } 818 819 spin_lock_init(&cq->lock); 820 cq->refcount = 1; 821 init_waitqueue_head(&cq->wait); 822 mutex_init(&cq->mutex); 823 824 memset(cq_context, 0, sizeof *cq_context); 825 cq_context->flags = cpu_to_be32(MTHCA_CQ_STATUS_OK | 826 MTHCA_CQ_STATE_DISARMED | 827 MTHCA_CQ_FLAG_TR); 828 cq_context->logsize_usrpage = cpu_to_be32((ffs(nent) - 1) << 24); 829 if (ctx) 830 cq_context->logsize_usrpage |= cpu_to_be32(ctx->uar.index); 831 else 832 cq_context->logsize_usrpage |= cpu_to_be32(dev->driver_uar.index); 833 cq_context->error_eqn = cpu_to_be32(dev->eq_table.eq[MTHCA_EQ_ASYNC].eqn); 834 cq_context->comp_eqn = cpu_to_be32(dev->eq_table.eq[MTHCA_EQ_COMP].eqn); 835 cq_context->pd = cpu_to_be32(pdn); 836 cq_context->lkey = cpu_to_be32(cq->buf.mr.ibmr.lkey); 837 cq_context->cqn = cpu_to_be32(cq->cqn); 838 839 if (mthca_is_memfree(dev)) { 840 cq_context->ci_db = cpu_to_be32(cq->set_ci_db_index); 841 cq_context->state_db = cpu_to_be32(cq->arm_db_index); 842 } 843 844 err = mthca_SW2HW_CQ(dev, mailbox, cq->cqn); 845 if (err) { 846 mthca_warn(dev, "SW2HW_CQ failed (%d)\n", err); 847 goto err_out_free_mr; 848 } 849 850 spin_lock_irq(&dev->cq_table.lock); 851 err = mthca_array_set(&dev->cq_table.cq, 852 cq->cqn & (dev->limits.num_cqs - 1), cq); 853 if (err) { 854 spin_unlock_irq(&dev->cq_table.lock); 855 goto err_out_free_mr; 856 } 857 spin_unlock_irq(&dev->cq_table.lock); 858 859 cq->cons_index = 0; 860 861 mthca_free_mailbox(dev, mailbox); 862 863 return 0; 864 865 err_out_free_mr: 866 if (cq->is_kernel) 867 mthca_free_cq_buf(dev, &cq->buf, cq->ibcq.cqe); 868 869 err_out_mailbox: 870 mthca_free_mailbox(dev, mailbox); 871 872 err_out_arm: 873 if (cq->is_kernel && mthca_is_memfree(dev)) 874 mthca_free_db(dev, MTHCA_DB_TYPE_CQ_ARM, cq->arm_db_index); 875 876 err_out_ci: 877 if (cq->is_kernel && mthca_is_memfree(dev)) 878 mthca_free_db(dev, MTHCA_DB_TYPE_CQ_SET_CI, cq->set_ci_db_index); 879 880 err_out_icm: 881 mthca_table_put(dev, dev->cq_table.table, cq->cqn); 882 883 err_out: 884 mthca_free(&dev->cq_table.alloc, cq->cqn); 885 886 return err; 887 } 888 889 static inline int get_cq_refcount(struct mthca_dev *dev, struct mthca_cq *cq) 890 { 891 int c; 892 893 spin_lock_irq(&dev->cq_table.lock); 894 c = cq->refcount; 895 spin_unlock_irq(&dev->cq_table.lock); 896 897 return c; 898 } 899 900 void mthca_free_cq(struct mthca_dev *dev, 901 struct mthca_cq *cq) 902 { 903 struct mthca_mailbox *mailbox; 904 int err; 905 906 mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL); 907 if (IS_ERR(mailbox)) { 908 mthca_warn(dev, "No memory for mailbox to free CQ.\n"); 909 return; 910 } 911 912 err = mthca_HW2SW_CQ(dev, mailbox, cq->cqn); 913 if (err) 914 mthca_warn(dev, "HW2SW_CQ failed (%d)\n", err); 915 916 if (0) { 917 __be32 *ctx = mailbox->buf; 918 int j; 919 920 printk(KERN_ERR "context for CQN %x (cons index %x, next sw %d)\n", 921 cq->cqn, cq->cons_index, 922 cq->is_kernel ? !!next_cqe_sw(cq) : 0); 923 for (j = 0; j < 16; ++j) 924 printk(KERN_ERR "[%2x] %08x\n", j * 4, be32_to_cpu(ctx[j])); 925 } 926 927 spin_lock_irq(&dev->cq_table.lock); 928 mthca_array_clear(&dev->cq_table.cq, 929 cq->cqn & (dev->limits.num_cqs - 1)); 930 --cq->refcount; 931 spin_unlock_irq(&dev->cq_table.lock); 932 933 if (dev->mthca_flags & MTHCA_FLAG_MSI_X) 934 synchronize_irq(dev->eq_table.eq[MTHCA_EQ_COMP].msi_x_vector); 935 else 936 synchronize_irq(dev->pdev->irq); 937 938 wait_event(cq->wait, !get_cq_refcount(dev, cq)); 939 940 if (cq->is_kernel) { 941 mthca_free_cq_buf(dev, &cq->buf, cq->ibcq.cqe); 942 if (mthca_is_memfree(dev)) { 943 mthca_free_db(dev, MTHCA_DB_TYPE_CQ_ARM, cq->arm_db_index); 944 mthca_free_db(dev, MTHCA_DB_TYPE_CQ_SET_CI, cq->set_ci_db_index); 945 } 946 } 947 948 mthca_table_put(dev, dev->cq_table.table, cq->cqn); 949 mthca_free(&dev->cq_table.alloc, cq->cqn); 950 mthca_free_mailbox(dev, mailbox); 951 } 952 953 int mthca_init_cq_table(struct mthca_dev *dev) 954 { 955 int err; 956 957 spin_lock_init(&dev->cq_table.lock); 958 959 err = mthca_alloc_init(&dev->cq_table.alloc, 960 dev->limits.num_cqs, 961 (1 << 24) - 1, 962 dev->limits.reserved_cqs); 963 if (err) 964 return err; 965 966 err = mthca_array_init(&dev->cq_table.cq, 967 dev->limits.num_cqs); 968 if (err) 969 mthca_alloc_cleanup(&dev->cq_table.alloc); 970 971 return err; 972 } 973 974 void mthca_cleanup_cq_table(struct mthca_dev *dev) 975 { 976 mthca_array_cleanup(&dev->cq_table.cq, dev->limits.num_cqs); 977 mthca_alloc_cleanup(&dev->cq_table.alloc); 978 } 979