1 /* 2 * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved. 3 * Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved. 4 * 5 * This software is available to you under a choice of one of two 6 * licenses. You may choose to be licensed under the terms of the GNU 7 * General Public License (GPL) Version 2, available from the file 8 * COPYING in the main directory of this source tree, or the 9 * OpenIB.org BSD license below: 10 * 11 * Redistribution and use in source and binary forms, with or 12 * without modification, are permitted provided that the following 13 * conditions are met: 14 * 15 * - Redistributions of source code must retain the above 16 * copyright notice, this list of conditions and the following 17 * disclaimer. 18 * 19 * - Redistributions in binary form must reproduce the above 20 * copyright notice, this list of conditions and the following 21 * disclaimer in the documentation and/or other materials 22 * provided with the distribution. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 31 * SOFTWARE. 32 */ 33 34 #include <linux/log2.h> 35 36 #include <rdma/ib_cache.h> 37 #include <rdma/ib_pack.h> 38 39 #include <linux/mlx4/qp.h> 40 41 #include "mlx4_ib.h" 42 #include "user.h" 43 44 enum { 45 MLX4_IB_ACK_REQ_FREQ = 8, 46 }; 47 48 enum { 49 MLX4_IB_DEFAULT_SCHED_QUEUE = 0x83, 50 MLX4_IB_DEFAULT_QP0_SCHED_QUEUE = 0x3f 51 }; 52 53 enum { 54 /* 55 * Largest possible UD header: send with GRH and immediate data. 56 */ 57 MLX4_IB_UD_HEADER_SIZE = 72 58 }; 59 60 struct mlx4_ib_sqp { 61 struct mlx4_ib_qp qp; 62 int pkey_index; 63 u32 qkey; 64 u32 send_psn; 65 struct ib_ud_header ud_header; 66 u8 header_buf[MLX4_IB_UD_HEADER_SIZE]; 67 }; 68 69 enum { 70 MLX4_IB_MIN_SQ_STRIDE = 6 71 }; 72 73 static const __be32 mlx4_ib_opcode[] = { 74 [IB_WR_SEND] = __constant_cpu_to_be32(MLX4_OPCODE_SEND), 75 [IB_WR_LSO] = __constant_cpu_to_be32(MLX4_OPCODE_LSO), 76 [IB_WR_SEND_WITH_IMM] = __constant_cpu_to_be32(MLX4_OPCODE_SEND_IMM), 77 [IB_WR_RDMA_WRITE] = __constant_cpu_to_be32(MLX4_OPCODE_RDMA_WRITE), 78 [IB_WR_RDMA_WRITE_WITH_IMM] = __constant_cpu_to_be32(MLX4_OPCODE_RDMA_WRITE_IMM), 79 [IB_WR_RDMA_READ] = __constant_cpu_to_be32(MLX4_OPCODE_RDMA_READ), 80 [IB_WR_ATOMIC_CMP_AND_SWP] = __constant_cpu_to_be32(MLX4_OPCODE_ATOMIC_CS), 81 [IB_WR_ATOMIC_FETCH_AND_ADD] = __constant_cpu_to_be32(MLX4_OPCODE_ATOMIC_FA), 82 [IB_WR_SEND_WITH_INV] = __constant_cpu_to_be32(MLX4_OPCODE_SEND_INVAL), 83 [IB_WR_LOCAL_INV] = __constant_cpu_to_be32(MLX4_OPCODE_LOCAL_INVAL), 84 [IB_WR_FAST_REG_MR] = __constant_cpu_to_be32(MLX4_OPCODE_FMR), 85 }; 86 87 static struct mlx4_ib_sqp *to_msqp(struct mlx4_ib_qp *mqp) 88 { 89 return container_of(mqp, struct mlx4_ib_sqp, qp); 90 } 91 92 static int is_sqp(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp) 93 { 94 return qp->mqp.qpn >= dev->dev->caps.sqp_start && 95 qp->mqp.qpn <= dev->dev->caps.sqp_start + 3; 96 } 97 98 static int is_qp0(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp) 99 { 100 return qp->mqp.qpn >= dev->dev->caps.sqp_start && 101 qp->mqp.qpn <= dev->dev->caps.sqp_start + 1; 102 } 103 104 static void *get_wqe(struct mlx4_ib_qp *qp, int offset) 105 { 106 return mlx4_buf_offset(&qp->buf, offset); 107 } 108 109 static void *get_recv_wqe(struct mlx4_ib_qp *qp, int n) 110 { 111 return get_wqe(qp, qp->rq.offset + (n << qp->rq.wqe_shift)); 112 } 113 114 static void *get_send_wqe(struct mlx4_ib_qp *qp, int n) 115 { 116 return get_wqe(qp, qp->sq.offset + (n << qp->sq.wqe_shift)); 117 } 118 119 /* 120 * Stamp a SQ WQE so that it is invalid if prefetched by marking the 121 * first four bytes of every 64 byte chunk with 122 * 0x7FFFFFF | (invalid_ownership_value << 31). 123 * 124 * When the max work request size is less than or equal to the WQE 125 * basic block size, as an optimization, we can stamp all WQEs with 126 * 0xffffffff, and skip the very first chunk of each WQE. 127 */ 128 static void stamp_send_wqe(struct mlx4_ib_qp *qp, int n, int size) 129 { 130 __be32 *wqe; 131 int i; 132 int s; 133 int ind; 134 void *buf; 135 __be32 stamp; 136 struct mlx4_wqe_ctrl_seg *ctrl; 137 138 if (qp->sq_max_wqes_per_wr > 1) { 139 s = roundup(size, 1U << qp->sq.wqe_shift); 140 for (i = 0; i < s; i += 64) { 141 ind = (i >> qp->sq.wqe_shift) + n; 142 stamp = ind & qp->sq.wqe_cnt ? cpu_to_be32(0x7fffffff) : 143 cpu_to_be32(0xffffffff); 144 buf = get_send_wqe(qp, ind & (qp->sq.wqe_cnt - 1)); 145 wqe = buf + (i & ((1 << qp->sq.wqe_shift) - 1)); 146 *wqe = stamp; 147 } 148 } else { 149 ctrl = buf = get_send_wqe(qp, n & (qp->sq.wqe_cnt - 1)); 150 s = (ctrl->fence_size & 0x3f) << 4; 151 for (i = 64; i < s; i += 64) { 152 wqe = buf + i; 153 *wqe = cpu_to_be32(0xffffffff); 154 } 155 } 156 } 157 158 static void post_nop_wqe(struct mlx4_ib_qp *qp, int n, int size) 159 { 160 struct mlx4_wqe_ctrl_seg *ctrl; 161 struct mlx4_wqe_inline_seg *inl; 162 void *wqe; 163 int s; 164 165 ctrl = wqe = get_send_wqe(qp, n & (qp->sq.wqe_cnt - 1)); 166 s = sizeof(struct mlx4_wqe_ctrl_seg); 167 168 if (qp->ibqp.qp_type == IB_QPT_UD) { 169 struct mlx4_wqe_datagram_seg *dgram = wqe + sizeof *ctrl; 170 struct mlx4_av *av = (struct mlx4_av *)dgram->av; 171 memset(dgram, 0, sizeof *dgram); 172 av->port_pd = cpu_to_be32((qp->port << 24) | to_mpd(qp->ibqp.pd)->pdn); 173 s += sizeof(struct mlx4_wqe_datagram_seg); 174 } 175 176 /* Pad the remainder of the WQE with an inline data segment. */ 177 if (size > s) { 178 inl = wqe + s; 179 inl->byte_count = cpu_to_be32(1 << 31 | (size - s - sizeof *inl)); 180 } 181 ctrl->srcrb_flags = 0; 182 ctrl->fence_size = size / 16; 183 /* 184 * Make sure descriptor is fully written before setting ownership bit 185 * (because HW can start executing as soon as we do). 186 */ 187 wmb(); 188 189 ctrl->owner_opcode = cpu_to_be32(MLX4_OPCODE_NOP | MLX4_WQE_CTRL_NEC) | 190 (n & qp->sq.wqe_cnt ? cpu_to_be32(1 << 31) : 0); 191 192 stamp_send_wqe(qp, n + qp->sq_spare_wqes, size); 193 } 194 195 /* Post NOP WQE to prevent wrap-around in the middle of WR */ 196 static inline unsigned pad_wraparound(struct mlx4_ib_qp *qp, int ind) 197 { 198 unsigned s = qp->sq.wqe_cnt - (ind & (qp->sq.wqe_cnt - 1)); 199 if (unlikely(s < qp->sq_max_wqes_per_wr)) { 200 post_nop_wqe(qp, ind, s << qp->sq.wqe_shift); 201 ind += s; 202 } 203 return ind; 204 } 205 206 static void mlx4_ib_qp_event(struct mlx4_qp *qp, enum mlx4_event type) 207 { 208 struct ib_event event; 209 struct ib_qp *ibqp = &to_mibqp(qp)->ibqp; 210 211 if (type == MLX4_EVENT_TYPE_PATH_MIG) 212 to_mibqp(qp)->port = to_mibqp(qp)->alt_port; 213 214 if (ibqp->event_handler) { 215 event.device = ibqp->device; 216 event.element.qp = ibqp; 217 switch (type) { 218 case MLX4_EVENT_TYPE_PATH_MIG: 219 event.event = IB_EVENT_PATH_MIG; 220 break; 221 case MLX4_EVENT_TYPE_COMM_EST: 222 event.event = IB_EVENT_COMM_EST; 223 break; 224 case MLX4_EVENT_TYPE_SQ_DRAINED: 225 event.event = IB_EVENT_SQ_DRAINED; 226 break; 227 case MLX4_EVENT_TYPE_SRQ_QP_LAST_WQE: 228 event.event = IB_EVENT_QP_LAST_WQE_REACHED; 229 break; 230 case MLX4_EVENT_TYPE_WQ_CATAS_ERROR: 231 event.event = IB_EVENT_QP_FATAL; 232 break; 233 case MLX4_EVENT_TYPE_PATH_MIG_FAILED: 234 event.event = IB_EVENT_PATH_MIG_ERR; 235 break; 236 case MLX4_EVENT_TYPE_WQ_INVAL_REQ_ERROR: 237 event.event = IB_EVENT_QP_REQ_ERR; 238 break; 239 case MLX4_EVENT_TYPE_WQ_ACCESS_ERROR: 240 event.event = IB_EVENT_QP_ACCESS_ERR; 241 break; 242 default: 243 printk(KERN_WARNING "mlx4_ib: Unexpected event type %d " 244 "on QP %06x\n", type, qp->qpn); 245 return; 246 } 247 248 ibqp->event_handler(&event, ibqp->qp_context); 249 } 250 } 251 252 static int send_wqe_overhead(enum ib_qp_type type, u32 flags) 253 { 254 /* 255 * UD WQEs must have a datagram segment. 256 * RC and UC WQEs might have a remote address segment. 257 * MLX WQEs need two extra inline data segments (for the UD 258 * header and space for the ICRC). 259 */ 260 switch (type) { 261 case IB_QPT_UD: 262 return sizeof (struct mlx4_wqe_ctrl_seg) + 263 sizeof (struct mlx4_wqe_datagram_seg) + 264 ((flags & MLX4_IB_QP_LSO) ? 64 : 0); 265 case IB_QPT_UC: 266 return sizeof (struct mlx4_wqe_ctrl_seg) + 267 sizeof (struct mlx4_wqe_raddr_seg); 268 case IB_QPT_RC: 269 return sizeof (struct mlx4_wqe_ctrl_seg) + 270 sizeof (struct mlx4_wqe_atomic_seg) + 271 sizeof (struct mlx4_wqe_raddr_seg); 272 case IB_QPT_SMI: 273 case IB_QPT_GSI: 274 return sizeof (struct mlx4_wqe_ctrl_seg) + 275 ALIGN(MLX4_IB_UD_HEADER_SIZE + 276 DIV_ROUND_UP(MLX4_IB_UD_HEADER_SIZE, 277 MLX4_INLINE_ALIGN) * 278 sizeof (struct mlx4_wqe_inline_seg), 279 sizeof (struct mlx4_wqe_data_seg)) + 280 ALIGN(4 + 281 sizeof (struct mlx4_wqe_inline_seg), 282 sizeof (struct mlx4_wqe_data_seg)); 283 default: 284 return sizeof (struct mlx4_wqe_ctrl_seg); 285 } 286 } 287 288 static int set_rq_size(struct mlx4_ib_dev *dev, struct ib_qp_cap *cap, 289 int is_user, int has_srq, struct mlx4_ib_qp *qp) 290 { 291 /* Sanity check RQ size before proceeding */ 292 if (cap->max_recv_wr > dev->dev->caps.max_wqes || 293 cap->max_recv_sge > dev->dev->caps.max_rq_sg) 294 return -EINVAL; 295 296 if (has_srq) { 297 /* QPs attached to an SRQ should have no RQ */ 298 if (cap->max_recv_wr) 299 return -EINVAL; 300 301 qp->rq.wqe_cnt = qp->rq.max_gs = 0; 302 } else { 303 /* HW requires >= 1 RQ entry with >= 1 gather entry */ 304 if (is_user && (!cap->max_recv_wr || !cap->max_recv_sge)) 305 return -EINVAL; 306 307 qp->rq.wqe_cnt = roundup_pow_of_two(max(1U, cap->max_recv_wr)); 308 qp->rq.max_gs = roundup_pow_of_two(max(1U, cap->max_recv_sge)); 309 qp->rq.wqe_shift = ilog2(qp->rq.max_gs * sizeof (struct mlx4_wqe_data_seg)); 310 } 311 312 cap->max_recv_wr = qp->rq.max_post = qp->rq.wqe_cnt; 313 cap->max_recv_sge = qp->rq.max_gs; 314 315 return 0; 316 } 317 318 static int set_kernel_sq_size(struct mlx4_ib_dev *dev, struct ib_qp_cap *cap, 319 enum ib_qp_type type, struct mlx4_ib_qp *qp) 320 { 321 int s; 322 323 /* Sanity check SQ size before proceeding */ 324 if (cap->max_send_wr > dev->dev->caps.max_wqes || 325 cap->max_send_sge > dev->dev->caps.max_sq_sg || 326 cap->max_inline_data + send_wqe_overhead(type, qp->flags) + 327 sizeof (struct mlx4_wqe_inline_seg) > dev->dev->caps.max_sq_desc_sz) 328 return -EINVAL; 329 330 /* 331 * For MLX transport we need 2 extra S/G entries: 332 * one for the header and one for the checksum at the end 333 */ 334 if ((type == IB_QPT_SMI || type == IB_QPT_GSI) && 335 cap->max_send_sge + 2 > dev->dev->caps.max_sq_sg) 336 return -EINVAL; 337 338 s = max(cap->max_send_sge * sizeof (struct mlx4_wqe_data_seg), 339 cap->max_inline_data + sizeof (struct mlx4_wqe_inline_seg)) + 340 send_wqe_overhead(type, qp->flags); 341 342 if (s > dev->dev->caps.max_sq_desc_sz) 343 return -EINVAL; 344 345 /* 346 * Hermon supports shrinking WQEs, such that a single work 347 * request can include multiple units of 1 << wqe_shift. This 348 * way, work requests can differ in size, and do not have to 349 * be a power of 2 in size, saving memory and speeding up send 350 * WR posting. Unfortunately, if we do this then the 351 * wqe_index field in CQEs can't be used to look up the WR ID 352 * anymore, so we do this only if selective signaling is off. 353 * 354 * Further, on 32-bit platforms, we can't use vmap() to make 355 * the QP buffer virtually contigious. Thus we have to use 356 * constant-sized WRs to make sure a WR is always fully within 357 * a single page-sized chunk. 358 * 359 * Finally, we use NOP work requests to pad the end of the 360 * work queue, to avoid wrap-around in the middle of WR. We 361 * set NEC bit to avoid getting completions with error for 362 * these NOP WRs, but since NEC is only supported starting 363 * with firmware 2.2.232, we use constant-sized WRs for older 364 * firmware. 365 * 366 * And, since MLX QPs only support SEND, we use constant-sized 367 * WRs in this case. 368 * 369 * We look for the smallest value of wqe_shift such that the 370 * resulting number of wqes does not exceed device 371 * capabilities. 372 * 373 * We set WQE size to at least 64 bytes, this way stamping 374 * invalidates each WQE. 375 */ 376 if (dev->dev->caps.fw_ver >= MLX4_FW_VER_WQE_CTRL_NEC && 377 qp->sq_signal_bits && BITS_PER_LONG == 64 && 378 type != IB_QPT_SMI && type != IB_QPT_GSI) 379 qp->sq.wqe_shift = ilog2(64); 380 else 381 qp->sq.wqe_shift = ilog2(roundup_pow_of_two(s)); 382 383 for (;;) { 384 qp->sq_max_wqes_per_wr = DIV_ROUND_UP(s, 1U << qp->sq.wqe_shift); 385 386 /* 387 * We need to leave 2 KB + 1 WR of headroom in the SQ to 388 * allow HW to prefetch. 389 */ 390 qp->sq_spare_wqes = (2048 >> qp->sq.wqe_shift) + qp->sq_max_wqes_per_wr; 391 qp->sq.wqe_cnt = roundup_pow_of_two(cap->max_send_wr * 392 qp->sq_max_wqes_per_wr + 393 qp->sq_spare_wqes); 394 395 if (qp->sq.wqe_cnt <= dev->dev->caps.max_wqes) 396 break; 397 398 if (qp->sq_max_wqes_per_wr <= 1) 399 return -EINVAL; 400 401 ++qp->sq.wqe_shift; 402 } 403 404 qp->sq.max_gs = (min(dev->dev->caps.max_sq_desc_sz, 405 (qp->sq_max_wqes_per_wr << qp->sq.wqe_shift)) - 406 send_wqe_overhead(type, qp->flags)) / 407 sizeof (struct mlx4_wqe_data_seg); 408 409 qp->buf_size = (qp->rq.wqe_cnt << qp->rq.wqe_shift) + 410 (qp->sq.wqe_cnt << qp->sq.wqe_shift); 411 if (qp->rq.wqe_shift > qp->sq.wqe_shift) { 412 qp->rq.offset = 0; 413 qp->sq.offset = qp->rq.wqe_cnt << qp->rq.wqe_shift; 414 } else { 415 qp->rq.offset = qp->sq.wqe_cnt << qp->sq.wqe_shift; 416 qp->sq.offset = 0; 417 } 418 419 cap->max_send_wr = qp->sq.max_post = 420 (qp->sq.wqe_cnt - qp->sq_spare_wqes) / qp->sq_max_wqes_per_wr; 421 cap->max_send_sge = min(qp->sq.max_gs, 422 min(dev->dev->caps.max_sq_sg, 423 dev->dev->caps.max_rq_sg)); 424 /* We don't support inline sends for kernel QPs (yet) */ 425 cap->max_inline_data = 0; 426 427 return 0; 428 } 429 430 static int set_user_sq_size(struct mlx4_ib_dev *dev, 431 struct mlx4_ib_qp *qp, 432 struct mlx4_ib_create_qp *ucmd) 433 { 434 /* Sanity check SQ size before proceeding */ 435 if ((1 << ucmd->log_sq_bb_count) > dev->dev->caps.max_wqes || 436 ucmd->log_sq_stride > 437 ilog2(roundup_pow_of_two(dev->dev->caps.max_sq_desc_sz)) || 438 ucmd->log_sq_stride < MLX4_IB_MIN_SQ_STRIDE) 439 return -EINVAL; 440 441 qp->sq.wqe_cnt = 1 << ucmd->log_sq_bb_count; 442 qp->sq.wqe_shift = ucmd->log_sq_stride; 443 444 qp->buf_size = (qp->rq.wqe_cnt << qp->rq.wqe_shift) + 445 (qp->sq.wqe_cnt << qp->sq.wqe_shift); 446 447 return 0; 448 } 449 450 static int create_qp_common(struct mlx4_ib_dev *dev, struct ib_pd *pd, 451 struct ib_qp_init_attr *init_attr, 452 struct ib_udata *udata, int sqpn, struct mlx4_ib_qp *qp) 453 { 454 int err; 455 456 mutex_init(&qp->mutex); 457 spin_lock_init(&qp->sq.lock); 458 spin_lock_init(&qp->rq.lock); 459 460 qp->state = IB_QPS_RESET; 461 if (init_attr->sq_sig_type == IB_SIGNAL_ALL_WR) 462 qp->sq_signal_bits = cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE); 463 464 err = set_rq_size(dev, &init_attr->cap, !!pd->uobject, !!init_attr->srq, qp); 465 if (err) 466 goto err; 467 468 if (pd->uobject) { 469 struct mlx4_ib_create_qp ucmd; 470 471 if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) { 472 err = -EFAULT; 473 goto err; 474 } 475 476 qp->sq_no_prefetch = ucmd.sq_no_prefetch; 477 478 err = set_user_sq_size(dev, qp, &ucmd); 479 if (err) 480 goto err; 481 482 qp->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr, 483 qp->buf_size, 0, 0); 484 if (IS_ERR(qp->umem)) { 485 err = PTR_ERR(qp->umem); 486 goto err; 487 } 488 489 err = mlx4_mtt_init(dev->dev, ib_umem_page_count(qp->umem), 490 ilog2(qp->umem->page_size), &qp->mtt); 491 if (err) 492 goto err_buf; 493 494 err = mlx4_ib_umem_write_mtt(dev, &qp->mtt, qp->umem); 495 if (err) 496 goto err_mtt; 497 498 if (!init_attr->srq) { 499 err = mlx4_ib_db_map_user(to_mucontext(pd->uobject->context), 500 ucmd.db_addr, &qp->db); 501 if (err) 502 goto err_mtt; 503 } 504 } else { 505 qp->sq_no_prefetch = 0; 506 507 if (init_attr->create_flags & IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK) 508 qp->flags |= MLX4_IB_QP_BLOCK_MULTICAST_LOOPBACK; 509 510 if (init_attr->create_flags & IB_QP_CREATE_IPOIB_UD_LSO) 511 qp->flags |= MLX4_IB_QP_LSO; 512 513 err = set_kernel_sq_size(dev, &init_attr->cap, init_attr->qp_type, qp); 514 if (err) 515 goto err; 516 517 if (!init_attr->srq) { 518 err = mlx4_db_alloc(dev->dev, &qp->db, 0); 519 if (err) 520 goto err; 521 522 *qp->db.db = 0; 523 } 524 525 if (mlx4_buf_alloc(dev->dev, qp->buf_size, PAGE_SIZE * 2, &qp->buf)) { 526 err = -ENOMEM; 527 goto err_db; 528 } 529 530 err = mlx4_mtt_init(dev->dev, qp->buf.npages, qp->buf.page_shift, 531 &qp->mtt); 532 if (err) 533 goto err_buf; 534 535 err = mlx4_buf_write_mtt(dev->dev, &qp->mtt, &qp->buf); 536 if (err) 537 goto err_mtt; 538 539 qp->sq.wrid = kmalloc(qp->sq.wqe_cnt * sizeof (u64), GFP_KERNEL); 540 qp->rq.wrid = kmalloc(qp->rq.wqe_cnt * sizeof (u64), GFP_KERNEL); 541 542 if (!qp->sq.wrid || !qp->rq.wrid) { 543 err = -ENOMEM; 544 goto err_wrid; 545 } 546 } 547 548 err = mlx4_qp_alloc(dev->dev, sqpn, &qp->mqp); 549 if (err) 550 goto err_wrid; 551 552 /* 553 * Hardware wants QPN written in big-endian order (after 554 * shifting) for send doorbell. Precompute this value to save 555 * a little bit when posting sends. 556 */ 557 qp->doorbell_qpn = swab32(qp->mqp.qpn << 8); 558 559 qp->mqp.event = mlx4_ib_qp_event; 560 561 return 0; 562 563 err_wrid: 564 if (pd->uobject) { 565 if (!init_attr->srq) 566 mlx4_ib_db_unmap_user(to_mucontext(pd->uobject->context), 567 &qp->db); 568 } else { 569 kfree(qp->sq.wrid); 570 kfree(qp->rq.wrid); 571 } 572 573 err_mtt: 574 mlx4_mtt_cleanup(dev->dev, &qp->mtt); 575 576 err_buf: 577 if (pd->uobject) 578 ib_umem_release(qp->umem); 579 else 580 mlx4_buf_free(dev->dev, qp->buf_size, &qp->buf); 581 582 err_db: 583 if (!pd->uobject && !init_attr->srq) 584 mlx4_db_free(dev->dev, &qp->db); 585 586 err: 587 return err; 588 } 589 590 static enum mlx4_qp_state to_mlx4_state(enum ib_qp_state state) 591 { 592 switch (state) { 593 case IB_QPS_RESET: return MLX4_QP_STATE_RST; 594 case IB_QPS_INIT: return MLX4_QP_STATE_INIT; 595 case IB_QPS_RTR: return MLX4_QP_STATE_RTR; 596 case IB_QPS_RTS: return MLX4_QP_STATE_RTS; 597 case IB_QPS_SQD: return MLX4_QP_STATE_SQD; 598 case IB_QPS_SQE: return MLX4_QP_STATE_SQER; 599 case IB_QPS_ERR: return MLX4_QP_STATE_ERR; 600 default: return -1; 601 } 602 } 603 604 static void mlx4_ib_lock_cqs(struct mlx4_ib_cq *send_cq, struct mlx4_ib_cq *recv_cq) 605 { 606 if (send_cq == recv_cq) 607 spin_lock_irq(&send_cq->lock); 608 else if (send_cq->mcq.cqn < recv_cq->mcq.cqn) { 609 spin_lock_irq(&send_cq->lock); 610 spin_lock_nested(&recv_cq->lock, SINGLE_DEPTH_NESTING); 611 } else { 612 spin_lock_irq(&recv_cq->lock); 613 spin_lock_nested(&send_cq->lock, SINGLE_DEPTH_NESTING); 614 } 615 } 616 617 static void mlx4_ib_unlock_cqs(struct mlx4_ib_cq *send_cq, struct mlx4_ib_cq *recv_cq) 618 { 619 if (send_cq == recv_cq) 620 spin_unlock_irq(&send_cq->lock); 621 else if (send_cq->mcq.cqn < recv_cq->mcq.cqn) { 622 spin_unlock(&recv_cq->lock); 623 spin_unlock_irq(&send_cq->lock); 624 } else { 625 spin_unlock(&send_cq->lock); 626 spin_unlock_irq(&recv_cq->lock); 627 } 628 } 629 630 static void destroy_qp_common(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp, 631 int is_user) 632 { 633 struct mlx4_ib_cq *send_cq, *recv_cq; 634 635 if (qp->state != IB_QPS_RESET) 636 if (mlx4_qp_modify(dev->dev, NULL, to_mlx4_state(qp->state), 637 MLX4_QP_STATE_RST, NULL, 0, 0, &qp->mqp)) 638 printk(KERN_WARNING "mlx4_ib: modify QP %06x to RESET failed.\n", 639 qp->mqp.qpn); 640 641 send_cq = to_mcq(qp->ibqp.send_cq); 642 recv_cq = to_mcq(qp->ibqp.recv_cq); 643 644 mlx4_ib_lock_cqs(send_cq, recv_cq); 645 646 if (!is_user) { 647 __mlx4_ib_cq_clean(recv_cq, qp->mqp.qpn, 648 qp->ibqp.srq ? to_msrq(qp->ibqp.srq): NULL); 649 if (send_cq != recv_cq) 650 __mlx4_ib_cq_clean(send_cq, qp->mqp.qpn, NULL); 651 } 652 653 mlx4_qp_remove(dev->dev, &qp->mqp); 654 655 mlx4_ib_unlock_cqs(send_cq, recv_cq); 656 657 mlx4_qp_free(dev->dev, &qp->mqp); 658 mlx4_mtt_cleanup(dev->dev, &qp->mtt); 659 660 if (is_user) { 661 if (!qp->ibqp.srq) 662 mlx4_ib_db_unmap_user(to_mucontext(qp->ibqp.uobject->context), 663 &qp->db); 664 ib_umem_release(qp->umem); 665 } else { 666 kfree(qp->sq.wrid); 667 kfree(qp->rq.wrid); 668 mlx4_buf_free(dev->dev, qp->buf_size, &qp->buf); 669 if (!qp->ibqp.srq) 670 mlx4_db_free(dev->dev, &qp->db); 671 } 672 } 673 674 struct ib_qp *mlx4_ib_create_qp(struct ib_pd *pd, 675 struct ib_qp_init_attr *init_attr, 676 struct ib_udata *udata) 677 { 678 struct mlx4_ib_dev *dev = to_mdev(pd->device); 679 struct mlx4_ib_sqp *sqp; 680 struct mlx4_ib_qp *qp; 681 int err; 682 683 /* 684 * We only support LSO and multicast loopback blocking, and 685 * only for kernel UD QPs. 686 */ 687 if (init_attr->create_flags & ~(IB_QP_CREATE_IPOIB_UD_LSO | 688 IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK)) 689 return ERR_PTR(-EINVAL); 690 691 if (init_attr->create_flags && 692 (pd->uobject || init_attr->qp_type != IB_QPT_UD)) 693 return ERR_PTR(-EINVAL); 694 695 switch (init_attr->qp_type) { 696 case IB_QPT_RC: 697 case IB_QPT_UC: 698 case IB_QPT_UD: 699 { 700 qp = kzalloc(sizeof *qp, GFP_KERNEL); 701 if (!qp) 702 return ERR_PTR(-ENOMEM); 703 704 err = create_qp_common(dev, pd, init_attr, udata, 0, qp); 705 if (err) { 706 kfree(qp); 707 return ERR_PTR(err); 708 } 709 710 qp->ibqp.qp_num = qp->mqp.qpn; 711 712 break; 713 } 714 case IB_QPT_SMI: 715 case IB_QPT_GSI: 716 { 717 /* Userspace is not allowed to create special QPs: */ 718 if (pd->uobject) 719 return ERR_PTR(-EINVAL); 720 721 sqp = kzalloc(sizeof *sqp, GFP_KERNEL); 722 if (!sqp) 723 return ERR_PTR(-ENOMEM); 724 725 qp = &sqp->qp; 726 727 err = create_qp_common(dev, pd, init_attr, udata, 728 dev->dev->caps.sqp_start + 729 (init_attr->qp_type == IB_QPT_SMI ? 0 : 2) + 730 init_attr->port_num - 1, 731 qp); 732 if (err) { 733 kfree(sqp); 734 return ERR_PTR(err); 735 } 736 737 qp->port = init_attr->port_num; 738 qp->ibqp.qp_num = init_attr->qp_type == IB_QPT_SMI ? 0 : 1; 739 740 break; 741 } 742 default: 743 /* Don't support raw QPs */ 744 return ERR_PTR(-EINVAL); 745 } 746 747 return &qp->ibqp; 748 } 749 750 int mlx4_ib_destroy_qp(struct ib_qp *qp) 751 { 752 struct mlx4_ib_dev *dev = to_mdev(qp->device); 753 struct mlx4_ib_qp *mqp = to_mqp(qp); 754 755 if (is_qp0(dev, mqp)) 756 mlx4_CLOSE_PORT(dev->dev, mqp->port); 757 758 destroy_qp_common(dev, mqp, !!qp->pd->uobject); 759 760 if (is_sqp(dev, mqp)) 761 kfree(to_msqp(mqp)); 762 else 763 kfree(mqp); 764 765 return 0; 766 } 767 768 static int to_mlx4_st(enum ib_qp_type type) 769 { 770 switch (type) { 771 case IB_QPT_RC: return MLX4_QP_ST_RC; 772 case IB_QPT_UC: return MLX4_QP_ST_UC; 773 case IB_QPT_UD: return MLX4_QP_ST_UD; 774 case IB_QPT_SMI: 775 case IB_QPT_GSI: return MLX4_QP_ST_MLX; 776 default: return -1; 777 } 778 } 779 780 static __be32 to_mlx4_access_flags(struct mlx4_ib_qp *qp, const struct ib_qp_attr *attr, 781 int attr_mask) 782 { 783 u8 dest_rd_atomic; 784 u32 access_flags; 785 u32 hw_access_flags = 0; 786 787 if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC) 788 dest_rd_atomic = attr->max_dest_rd_atomic; 789 else 790 dest_rd_atomic = qp->resp_depth; 791 792 if (attr_mask & IB_QP_ACCESS_FLAGS) 793 access_flags = attr->qp_access_flags; 794 else 795 access_flags = qp->atomic_rd_en; 796 797 if (!dest_rd_atomic) 798 access_flags &= IB_ACCESS_REMOTE_WRITE; 799 800 if (access_flags & IB_ACCESS_REMOTE_READ) 801 hw_access_flags |= MLX4_QP_BIT_RRE; 802 if (access_flags & IB_ACCESS_REMOTE_ATOMIC) 803 hw_access_flags |= MLX4_QP_BIT_RAE; 804 if (access_flags & IB_ACCESS_REMOTE_WRITE) 805 hw_access_flags |= MLX4_QP_BIT_RWE; 806 807 return cpu_to_be32(hw_access_flags); 808 } 809 810 static void store_sqp_attrs(struct mlx4_ib_sqp *sqp, const struct ib_qp_attr *attr, 811 int attr_mask) 812 { 813 if (attr_mask & IB_QP_PKEY_INDEX) 814 sqp->pkey_index = attr->pkey_index; 815 if (attr_mask & IB_QP_QKEY) 816 sqp->qkey = attr->qkey; 817 if (attr_mask & IB_QP_SQ_PSN) 818 sqp->send_psn = attr->sq_psn; 819 } 820 821 static void mlx4_set_sched(struct mlx4_qp_path *path, u8 port) 822 { 823 path->sched_queue = (path->sched_queue & 0xbf) | ((port - 1) << 6); 824 } 825 826 static int mlx4_set_path(struct mlx4_ib_dev *dev, const struct ib_ah_attr *ah, 827 struct mlx4_qp_path *path, u8 port) 828 { 829 path->grh_mylmc = ah->src_path_bits & 0x7f; 830 path->rlid = cpu_to_be16(ah->dlid); 831 if (ah->static_rate) { 832 path->static_rate = ah->static_rate + MLX4_STAT_RATE_OFFSET; 833 while (path->static_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET && 834 !(1 << path->static_rate & dev->dev->caps.stat_rate_support)) 835 --path->static_rate; 836 } else 837 path->static_rate = 0; 838 path->counter_index = 0xff; 839 840 if (ah->ah_flags & IB_AH_GRH) { 841 if (ah->grh.sgid_index >= dev->dev->caps.gid_table_len[port]) { 842 printk(KERN_ERR "sgid_index (%u) too large. max is %d\n", 843 ah->grh.sgid_index, dev->dev->caps.gid_table_len[port] - 1); 844 return -1; 845 } 846 847 path->grh_mylmc |= 1 << 7; 848 path->mgid_index = ah->grh.sgid_index; 849 path->hop_limit = ah->grh.hop_limit; 850 path->tclass_flowlabel = 851 cpu_to_be32((ah->grh.traffic_class << 20) | 852 (ah->grh.flow_label)); 853 memcpy(path->rgid, ah->grh.dgid.raw, 16); 854 } 855 856 path->sched_queue = MLX4_IB_DEFAULT_SCHED_QUEUE | 857 ((port - 1) << 6) | ((ah->sl & 0xf) << 2); 858 859 return 0; 860 } 861 862 static int __mlx4_ib_modify_qp(struct ib_qp *ibqp, 863 const struct ib_qp_attr *attr, int attr_mask, 864 enum ib_qp_state cur_state, enum ib_qp_state new_state) 865 { 866 struct mlx4_ib_dev *dev = to_mdev(ibqp->device); 867 struct mlx4_ib_qp *qp = to_mqp(ibqp); 868 struct mlx4_qp_context *context; 869 enum mlx4_qp_optpar optpar = 0; 870 int sqd_event; 871 int err = -EINVAL; 872 873 context = kzalloc(sizeof *context, GFP_KERNEL); 874 if (!context) 875 return -ENOMEM; 876 877 context->flags = cpu_to_be32((to_mlx4_state(new_state) << 28) | 878 (to_mlx4_st(ibqp->qp_type) << 16)); 879 context->flags |= cpu_to_be32(1 << 8); /* DE? */ 880 881 if (!(attr_mask & IB_QP_PATH_MIG_STATE)) 882 context->flags |= cpu_to_be32(MLX4_QP_PM_MIGRATED << 11); 883 else { 884 optpar |= MLX4_QP_OPTPAR_PM_STATE; 885 switch (attr->path_mig_state) { 886 case IB_MIG_MIGRATED: 887 context->flags |= cpu_to_be32(MLX4_QP_PM_MIGRATED << 11); 888 break; 889 case IB_MIG_REARM: 890 context->flags |= cpu_to_be32(MLX4_QP_PM_REARM << 11); 891 break; 892 case IB_MIG_ARMED: 893 context->flags |= cpu_to_be32(MLX4_QP_PM_ARMED << 11); 894 break; 895 } 896 } 897 898 if (ibqp->qp_type == IB_QPT_GSI || ibqp->qp_type == IB_QPT_SMI) 899 context->mtu_msgmax = (IB_MTU_4096 << 5) | 11; 900 else if (ibqp->qp_type == IB_QPT_UD) { 901 if (qp->flags & MLX4_IB_QP_LSO) 902 context->mtu_msgmax = (IB_MTU_4096 << 5) | 903 ilog2(dev->dev->caps.max_gso_sz); 904 else 905 context->mtu_msgmax = (IB_MTU_4096 << 5) | 12; 906 } else if (attr_mask & IB_QP_PATH_MTU) { 907 if (attr->path_mtu < IB_MTU_256 || attr->path_mtu > IB_MTU_4096) { 908 printk(KERN_ERR "path MTU (%u) is invalid\n", 909 attr->path_mtu); 910 goto out; 911 } 912 context->mtu_msgmax = (attr->path_mtu << 5) | 913 ilog2(dev->dev->caps.max_msg_sz); 914 } 915 916 if (qp->rq.wqe_cnt) 917 context->rq_size_stride = ilog2(qp->rq.wqe_cnt) << 3; 918 context->rq_size_stride |= qp->rq.wqe_shift - 4; 919 920 if (qp->sq.wqe_cnt) 921 context->sq_size_stride = ilog2(qp->sq.wqe_cnt) << 3; 922 context->sq_size_stride |= qp->sq.wqe_shift - 4; 923 924 if (cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT) 925 context->sq_size_stride |= !!qp->sq_no_prefetch << 7; 926 927 if (qp->ibqp.uobject) 928 context->usr_page = cpu_to_be32(to_mucontext(ibqp->uobject->context)->uar.index); 929 else 930 context->usr_page = cpu_to_be32(dev->priv_uar.index); 931 932 if (attr_mask & IB_QP_DEST_QPN) 933 context->remote_qpn = cpu_to_be32(attr->dest_qp_num); 934 935 if (attr_mask & IB_QP_PORT) { 936 if (cur_state == IB_QPS_SQD && new_state == IB_QPS_SQD && 937 !(attr_mask & IB_QP_AV)) { 938 mlx4_set_sched(&context->pri_path, attr->port_num); 939 optpar |= MLX4_QP_OPTPAR_SCHED_QUEUE; 940 } 941 } 942 943 if (attr_mask & IB_QP_PKEY_INDEX) { 944 context->pri_path.pkey_index = attr->pkey_index; 945 optpar |= MLX4_QP_OPTPAR_PKEY_INDEX; 946 } 947 948 if (attr_mask & IB_QP_AV) { 949 if (mlx4_set_path(dev, &attr->ah_attr, &context->pri_path, 950 attr_mask & IB_QP_PORT ? attr->port_num : qp->port)) 951 goto out; 952 953 optpar |= (MLX4_QP_OPTPAR_PRIMARY_ADDR_PATH | 954 MLX4_QP_OPTPAR_SCHED_QUEUE); 955 } 956 957 if (attr_mask & IB_QP_TIMEOUT) { 958 context->pri_path.ackto = attr->timeout << 3; 959 optpar |= MLX4_QP_OPTPAR_ACK_TIMEOUT; 960 } 961 962 if (attr_mask & IB_QP_ALT_PATH) { 963 if (attr->alt_port_num == 0 || 964 attr->alt_port_num > dev->dev->caps.num_ports) 965 goto out; 966 967 if (attr->alt_pkey_index >= 968 dev->dev->caps.pkey_table_len[attr->alt_port_num]) 969 goto out; 970 971 if (mlx4_set_path(dev, &attr->alt_ah_attr, &context->alt_path, 972 attr->alt_port_num)) 973 goto out; 974 975 context->alt_path.pkey_index = attr->alt_pkey_index; 976 context->alt_path.ackto = attr->alt_timeout << 3; 977 optpar |= MLX4_QP_OPTPAR_ALT_ADDR_PATH; 978 } 979 980 context->pd = cpu_to_be32(to_mpd(ibqp->pd)->pdn); 981 context->params1 = cpu_to_be32(MLX4_IB_ACK_REQ_FREQ << 28); 982 983 /* Set "fast registration enabled" for all kernel QPs */ 984 if (!qp->ibqp.uobject) 985 context->params1 |= cpu_to_be32(1 << 11); 986 987 if (attr_mask & IB_QP_RNR_RETRY) { 988 context->params1 |= cpu_to_be32(attr->rnr_retry << 13); 989 optpar |= MLX4_QP_OPTPAR_RNR_RETRY; 990 } 991 992 if (attr_mask & IB_QP_RETRY_CNT) { 993 context->params1 |= cpu_to_be32(attr->retry_cnt << 16); 994 optpar |= MLX4_QP_OPTPAR_RETRY_COUNT; 995 } 996 997 if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC) { 998 if (attr->max_rd_atomic) 999 context->params1 |= 1000 cpu_to_be32(fls(attr->max_rd_atomic - 1) << 21); 1001 optpar |= MLX4_QP_OPTPAR_SRA_MAX; 1002 } 1003 1004 if (attr_mask & IB_QP_SQ_PSN) 1005 context->next_send_psn = cpu_to_be32(attr->sq_psn); 1006 1007 context->cqn_send = cpu_to_be32(to_mcq(ibqp->send_cq)->mcq.cqn); 1008 1009 if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC) { 1010 if (attr->max_dest_rd_atomic) 1011 context->params2 |= 1012 cpu_to_be32(fls(attr->max_dest_rd_atomic - 1) << 21); 1013 optpar |= MLX4_QP_OPTPAR_RRA_MAX; 1014 } 1015 1016 if (attr_mask & (IB_QP_ACCESS_FLAGS | IB_QP_MAX_DEST_RD_ATOMIC)) { 1017 context->params2 |= to_mlx4_access_flags(qp, attr, attr_mask); 1018 optpar |= MLX4_QP_OPTPAR_RWE | MLX4_QP_OPTPAR_RRE | MLX4_QP_OPTPAR_RAE; 1019 } 1020 1021 if (ibqp->srq) 1022 context->params2 |= cpu_to_be32(MLX4_QP_BIT_RIC); 1023 1024 if (attr_mask & IB_QP_MIN_RNR_TIMER) { 1025 context->rnr_nextrecvpsn |= cpu_to_be32(attr->min_rnr_timer << 24); 1026 optpar |= MLX4_QP_OPTPAR_RNR_TIMEOUT; 1027 } 1028 if (attr_mask & IB_QP_RQ_PSN) 1029 context->rnr_nextrecvpsn |= cpu_to_be32(attr->rq_psn); 1030 1031 context->cqn_recv = cpu_to_be32(to_mcq(ibqp->recv_cq)->mcq.cqn); 1032 1033 if (attr_mask & IB_QP_QKEY) { 1034 context->qkey = cpu_to_be32(attr->qkey); 1035 optpar |= MLX4_QP_OPTPAR_Q_KEY; 1036 } 1037 1038 if (ibqp->srq) 1039 context->srqn = cpu_to_be32(1 << 24 | to_msrq(ibqp->srq)->msrq.srqn); 1040 1041 if (!ibqp->srq && cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT) 1042 context->db_rec_addr = cpu_to_be64(qp->db.dma); 1043 1044 if (cur_state == IB_QPS_INIT && 1045 new_state == IB_QPS_RTR && 1046 (ibqp->qp_type == IB_QPT_GSI || ibqp->qp_type == IB_QPT_SMI || 1047 ibqp->qp_type == IB_QPT_UD)) { 1048 context->pri_path.sched_queue = (qp->port - 1) << 6; 1049 if (is_qp0(dev, qp)) 1050 context->pri_path.sched_queue |= MLX4_IB_DEFAULT_QP0_SCHED_QUEUE; 1051 else 1052 context->pri_path.sched_queue |= MLX4_IB_DEFAULT_SCHED_QUEUE; 1053 } 1054 1055 if (cur_state == IB_QPS_RTS && new_state == IB_QPS_SQD && 1056 attr_mask & IB_QP_EN_SQD_ASYNC_NOTIFY && attr->en_sqd_async_notify) 1057 sqd_event = 1; 1058 else 1059 sqd_event = 0; 1060 1061 if (!ibqp->uobject && cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT) 1062 context->rlkey |= (1 << 4); 1063 1064 /* 1065 * Before passing a kernel QP to the HW, make sure that the 1066 * ownership bits of the send queue are set and the SQ 1067 * headroom is stamped so that the hardware doesn't start 1068 * processing stale work requests. 1069 */ 1070 if (!ibqp->uobject && cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT) { 1071 struct mlx4_wqe_ctrl_seg *ctrl; 1072 int i; 1073 1074 for (i = 0; i < qp->sq.wqe_cnt; ++i) { 1075 ctrl = get_send_wqe(qp, i); 1076 ctrl->owner_opcode = cpu_to_be32(1 << 31); 1077 if (qp->sq_max_wqes_per_wr == 1) 1078 ctrl->fence_size = 1 << (qp->sq.wqe_shift - 4); 1079 1080 stamp_send_wqe(qp, i, 1 << qp->sq.wqe_shift); 1081 } 1082 } 1083 1084 err = mlx4_qp_modify(dev->dev, &qp->mtt, to_mlx4_state(cur_state), 1085 to_mlx4_state(new_state), context, optpar, 1086 sqd_event, &qp->mqp); 1087 if (err) 1088 goto out; 1089 1090 qp->state = new_state; 1091 1092 if (attr_mask & IB_QP_ACCESS_FLAGS) 1093 qp->atomic_rd_en = attr->qp_access_flags; 1094 if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC) 1095 qp->resp_depth = attr->max_dest_rd_atomic; 1096 if (attr_mask & IB_QP_PORT) 1097 qp->port = attr->port_num; 1098 if (attr_mask & IB_QP_ALT_PATH) 1099 qp->alt_port = attr->alt_port_num; 1100 1101 if (is_sqp(dev, qp)) 1102 store_sqp_attrs(to_msqp(qp), attr, attr_mask); 1103 1104 /* 1105 * If we moved QP0 to RTR, bring the IB link up; if we moved 1106 * QP0 to RESET or ERROR, bring the link back down. 1107 */ 1108 if (is_qp0(dev, qp)) { 1109 if (cur_state != IB_QPS_RTR && new_state == IB_QPS_RTR) 1110 if (mlx4_INIT_PORT(dev->dev, qp->port)) 1111 printk(KERN_WARNING "INIT_PORT failed for port %d\n", 1112 qp->port); 1113 1114 if (cur_state != IB_QPS_RESET && cur_state != IB_QPS_ERR && 1115 (new_state == IB_QPS_RESET || new_state == IB_QPS_ERR)) 1116 mlx4_CLOSE_PORT(dev->dev, qp->port); 1117 } 1118 1119 /* 1120 * If we moved a kernel QP to RESET, clean up all old CQ 1121 * entries and reinitialize the QP. 1122 */ 1123 if (new_state == IB_QPS_RESET && !ibqp->uobject) { 1124 mlx4_ib_cq_clean(to_mcq(ibqp->recv_cq), qp->mqp.qpn, 1125 ibqp->srq ? to_msrq(ibqp->srq): NULL); 1126 if (ibqp->send_cq != ibqp->recv_cq) 1127 mlx4_ib_cq_clean(to_mcq(ibqp->send_cq), qp->mqp.qpn, NULL); 1128 1129 qp->rq.head = 0; 1130 qp->rq.tail = 0; 1131 qp->sq.head = 0; 1132 qp->sq.tail = 0; 1133 qp->sq_next_wqe = 0; 1134 if (!ibqp->srq) 1135 *qp->db.db = 0; 1136 } 1137 1138 out: 1139 kfree(context); 1140 return err; 1141 } 1142 1143 int mlx4_ib_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr, 1144 int attr_mask, struct ib_udata *udata) 1145 { 1146 struct mlx4_ib_dev *dev = to_mdev(ibqp->device); 1147 struct mlx4_ib_qp *qp = to_mqp(ibqp); 1148 enum ib_qp_state cur_state, new_state; 1149 int err = -EINVAL; 1150 1151 mutex_lock(&qp->mutex); 1152 1153 cur_state = attr_mask & IB_QP_CUR_STATE ? attr->cur_qp_state : qp->state; 1154 new_state = attr_mask & IB_QP_STATE ? attr->qp_state : cur_state; 1155 1156 if (!ib_modify_qp_is_ok(cur_state, new_state, ibqp->qp_type, attr_mask)) 1157 goto out; 1158 1159 if ((attr_mask & IB_QP_PORT) && 1160 (attr->port_num == 0 || attr->port_num > dev->dev->caps.num_ports)) { 1161 goto out; 1162 } 1163 1164 if (attr_mask & IB_QP_PKEY_INDEX) { 1165 int p = attr_mask & IB_QP_PORT ? attr->port_num : qp->port; 1166 if (attr->pkey_index >= dev->dev->caps.pkey_table_len[p]) 1167 goto out; 1168 } 1169 1170 if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC && 1171 attr->max_rd_atomic > dev->dev->caps.max_qp_init_rdma) { 1172 goto out; 1173 } 1174 1175 if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC && 1176 attr->max_dest_rd_atomic > dev->dev->caps.max_qp_dest_rdma) { 1177 goto out; 1178 } 1179 1180 if (cur_state == new_state && cur_state == IB_QPS_RESET) { 1181 err = 0; 1182 goto out; 1183 } 1184 1185 err = __mlx4_ib_modify_qp(ibqp, attr, attr_mask, cur_state, new_state); 1186 1187 out: 1188 mutex_unlock(&qp->mutex); 1189 return err; 1190 } 1191 1192 static int build_mlx_header(struct mlx4_ib_sqp *sqp, struct ib_send_wr *wr, 1193 void *wqe, unsigned *mlx_seg_len) 1194 { 1195 struct ib_device *ib_dev = &to_mdev(sqp->qp.ibqp.device)->ib_dev; 1196 struct mlx4_wqe_mlx_seg *mlx = wqe; 1197 struct mlx4_wqe_inline_seg *inl = wqe + sizeof *mlx; 1198 struct mlx4_ib_ah *ah = to_mah(wr->wr.ud.ah); 1199 u16 pkey; 1200 int send_size; 1201 int header_size; 1202 int spc; 1203 int i; 1204 1205 send_size = 0; 1206 for (i = 0; i < wr->num_sge; ++i) 1207 send_size += wr->sg_list[i].length; 1208 1209 ib_ud_header_init(send_size, mlx4_ib_ah_grh_present(ah), &sqp->ud_header); 1210 1211 sqp->ud_header.lrh.service_level = 1212 be32_to_cpu(ah->av.sl_tclass_flowlabel) >> 28; 1213 sqp->ud_header.lrh.destination_lid = ah->av.dlid; 1214 sqp->ud_header.lrh.source_lid = cpu_to_be16(ah->av.g_slid & 0x7f); 1215 if (mlx4_ib_ah_grh_present(ah)) { 1216 sqp->ud_header.grh.traffic_class = 1217 (be32_to_cpu(ah->av.sl_tclass_flowlabel) >> 20) & 0xff; 1218 sqp->ud_header.grh.flow_label = 1219 ah->av.sl_tclass_flowlabel & cpu_to_be32(0xfffff); 1220 sqp->ud_header.grh.hop_limit = ah->av.hop_limit; 1221 ib_get_cached_gid(ib_dev, be32_to_cpu(ah->av.port_pd) >> 24, 1222 ah->av.gid_index, &sqp->ud_header.grh.source_gid); 1223 memcpy(sqp->ud_header.grh.destination_gid.raw, 1224 ah->av.dgid, 16); 1225 } 1226 1227 mlx->flags &= cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE); 1228 mlx->flags |= cpu_to_be32((!sqp->qp.ibqp.qp_num ? MLX4_WQE_MLX_VL15 : 0) | 1229 (sqp->ud_header.lrh.destination_lid == 1230 IB_LID_PERMISSIVE ? MLX4_WQE_MLX_SLR : 0) | 1231 (sqp->ud_header.lrh.service_level << 8)); 1232 mlx->rlid = sqp->ud_header.lrh.destination_lid; 1233 1234 switch (wr->opcode) { 1235 case IB_WR_SEND: 1236 sqp->ud_header.bth.opcode = IB_OPCODE_UD_SEND_ONLY; 1237 sqp->ud_header.immediate_present = 0; 1238 break; 1239 case IB_WR_SEND_WITH_IMM: 1240 sqp->ud_header.bth.opcode = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE; 1241 sqp->ud_header.immediate_present = 1; 1242 sqp->ud_header.immediate_data = wr->ex.imm_data; 1243 break; 1244 default: 1245 return -EINVAL; 1246 } 1247 1248 sqp->ud_header.lrh.virtual_lane = !sqp->qp.ibqp.qp_num ? 15 : 0; 1249 if (sqp->ud_header.lrh.destination_lid == IB_LID_PERMISSIVE) 1250 sqp->ud_header.lrh.source_lid = IB_LID_PERMISSIVE; 1251 sqp->ud_header.bth.solicited_event = !!(wr->send_flags & IB_SEND_SOLICITED); 1252 if (!sqp->qp.ibqp.qp_num) 1253 ib_get_cached_pkey(ib_dev, sqp->qp.port, sqp->pkey_index, &pkey); 1254 else 1255 ib_get_cached_pkey(ib_dev, sqp->qp.port, wr->wr.ud.pkey_index, &pkey); 1256 sqp->ud_header.bth.pkey = cpu_to_be16(pkey); 1257 sqp->ud_header.bth.destination_qpn = cpu_to_be32(wr->wr.ud.remote_qpn); 1258 sqp->ud_header.bth.psn = cpu_to_be32((sqp->send_psn++) & ((1 << 24) - 1)); 1259 sqp->ud_header.deth.qkey = cpu_to_be32(wr->wr.ud.remote_qkey & 0x80000000 ? 1260 sqp->qkey : wr->wr.ud.remote_qkey); 1261 sqp->ud_header.deth.source_qpn = cpu_to_be32(sqp->qp.ibqp.qp_num); 1262 1263 header_size = ib_ud_header_pack(&sqp->ud_header, sqp->header_buf); 1264 1265 if (0) { 1266 printk(KERN_ERR "built UD header of size %d:\n", header_size); 1267 for (i = 0; i < header_size / 4; ++i) { 1268 if (i % 8 == 0) 1269 printk(" [%02x] ", i * 4); 1270 printk(" %08x", 1271 be32_to_cpu(((__be32 *) sqp->header_buf)[i])); 1272 if ((i + 1) % 8 == 0) 1273 printk("\n"); 1274 } 1275 printk("\n"); 1276 } 1277 1278 /* 1279 * Inline data segments may not cross a 64 byte boundary. If 1280 * our UD header is bigger than the space available up to the 1281 * next 64 byte boundary in the WQE, use two inline data 1282 * segments to hold the UD header. 1283 */ 1284 spc = MLX4_INLINE_ALIGN - 1285 ((unsigned long) (inl + 1) & (MLX4_INLINE_ALIGN - 1)); 1286 if (header_size <= spc) { 1287 inl->byte_count = cpu_to_be32(1 << 31 | header_size); 1288 memcpy(inl + 1, sqp->header_buf, header_size); 1289 i = 1; 1290 } else { 1291 inl->byte_count = cpu_to_be32(1 << 31 | spc); 1292 memcpy(inl + 1, sqp->header_buf, spc); 1293 1294 inl = (void *) (inl + 1) + spc; 1295 memcpy(inl + 1, sqp->header_buf + spc, header_size - spc); 1296 /* 1297 * Need a barrier here to make sure all the data is 1298 * visible before the byte_count field is set. 1299 * Otherwise the HCA prefetcher could grab the 64-byte 1300 * chunk with this inline segment and get a valid (!= 1301 * 0xffffffff) byte count but stale data, and end up 1302 * generating a packet with bad headers. 1303 * 1304 * The first inline segment's byte_count field doesn't 1305 * need a barrier, because it comes after a 1306 * control/MLX segment and therefore is at an offset 1307 * of 16 mod 64. 1308 */ 1309 wmb(); 1310 inl->byte_count = cpu_to_be32(1 << 31 | (header_size - spc)); 1311 i = 2; 1312 } 1313 1314 *mlx_seg_len = 1315 ALIGN(i * sizeof (struct mlx4_wqe_inline_seg) + header_size, 16); 1316 return 0; 1317 } 1318 1319 static int mlx4_wq_overflow(struct mlx4_ib_wq *wq, int nreq, struct ib_cq *ib_cq) 1320 { 1321 unsigned cur; 1322 struct mlx4_ib_cq *cq; 1323 1324 cur = wq->head - wq->tail; 1325 if (likely(cur + nreq < wq->max_post)) 1326 return 0; 1327 1328 cq = to_mcq(ib_cq); 1329 spin_lock(&cq->lock); 1330 cur = wq->head - wq->tail; 1331 spin_unlock(&cq->lock); 1332 1333 return cur + nreq >= wq->max_post; 1334 } 1335 1336 static __be32 convert_access(int acc) 1337 { 1338 return (acc & IB_ACCESS_REMOTE_ATOMIC ? cpu_to_be32(MLX4_WQE_FMR_PERM_ATOMIC) : 0) | 1339 (acc & IB_ACCESS_REMOTE_WRITE ? cpu_to_be32(MLX4_WQE_FMR_PERM_REMOTE_WRITE) : 0) | 1340 (acc & IB_ACCESS_REMOTE_READ ? cpu_to_be32(MLX4_WQE_FMR_PERM_REMOTE_READ) : 0) | 1341 (acc & IB_ACCESS_LOCAL_WRITE ? cpu_to_be32(MLX4_WQE_FMR_PERM_LOCAL_WRITE) : 0) | 1342 cpu_to_be32(MLX4_WQE_FMR_PERM_LOCAL_READ); 1343 } 1344 1345 static void set_fmr_seg(struct mlx4_wqe_fmr_seg *fseg, struct ib_send_wr *wr) 1346 { 1347 struct mlx4_ib_fast_reg_page_list *mfrpl = to_mfrpl(wr->wr.fast_reg.page_list); 1348 int i; 1349 1350 for (i = 0; i < wr->wr.fast_reg.page_list_len; ++i) 1351 wr->wr.fast_reg.page_list->page_list[i] = 1352 cpu_to_be64(wr->wr.fast_reg.page_list->page_list[i] | 1353 MLX4_MTT_FLAG_PRESENT); 1354 1355 fseg->flags = convert_access(wr->wr.fast_reg.access_flags); 1356 fseg->mem_key = cpu_to_be32(wr->wr.fast_reg.rkey); 1357 fseg->buf_list = cpu_to_be64(mfrpl->map); 1358 fseg->start_addr = cpu_to_be64(wr->wr.fast_reg.iova_start); 1359 fseg->reg_len = cpu_to_be64(wr->wr.fast_reg.length); 1360 fseg->offset = 0; /* XXX -- is this just for ZBVA? */ 1361 fseg->page_size = cpu_to_be32(wr->wr.fast_reg.page_shift); 1362 fseg->reserved[0] = 0; 1363 fseg->reserved[1] = 0; 1364 } 1365 1366 static void set_local_inv_seg(struct mlx4_wqe_local_inval_seg *iseg, u32 rkey) 1367 { 1368 iseg->flags = 0; 1369 iseg->mem_key = cpu_to_be32(rkey); 1370 iseg->guest_id = 0; 1371 iseg->pa = 0; 1372 } 1373 1374 static __always_inline void set_raddr_seg(struct mlx4_wqe_raddr_seg *rseg, 1375 u64 remote_addr, u32 rkey) 1376 { 1377 rseg->raddr = cpu_to_be64(remote_addr); 1378 rseg->rkey = cpu_to_be32(rkey); 1379 rseg->reserved = 0; 1380 } 1381 1382 static void set_atomic_seg(struct mlx4_wqe_atomic_seg *aseg, struct ib_send_wr *wr) 1383 { 1384 if (wr->opcode == IB_WR_ATOMIC_CMP_AND_SWP) { 1385 aseg->swap_add = cpu_to_be64(wr->wr.atomic.swap); 1386 aseg->compare = cpu_to_be64(wr->wr.atomic.compare_add); 1387 } else { 1388 aseg->swap_add = cpu_to_be64(wr->wr.atomic.compare_add); 1389 aseg->compare = 0; 1390 } 1391 1392 } 1393 1394 static void set_datagram_seg(struct mlx4_wqe_datagram_seg *dseg, 1395 struct ib_send_wr *wr) 1396 { 1397 memcpy(dseg->av, &to_mah(wr->wr.ud.ah)->av, sizeof (struct mlx4_av)); 1398 dseg->dqpn = cpu_to_be32(wr->wr.ud.remote_qpn); 1399 dseg->qkey = cpu_to_be32(wr->wr.ud.remote_qkey); 1400 } 1401 1402 static void set_mlx_icrc_seg(void *dseg) 1403 { 1404 u32 *t = dseg; 1405 struct mlx4_wqe_inline_seg *iseg = dseg; 1406 1407 t[1] = 0; 1408 1409 /* 1410 * Need a barrier here before writing the byte_count field to 1411 * make sure that all the data is visible before the 1412 * byte_count field is set. Otherwise, if the segment begins 1413 * a new cacheline, the HCA prefetcher could grab the 64-byte 1414 * chunk and get a valid (!= * 0xffffffff) byte count but 1415 * stale data, and end up sending the wrong data. 1416 */ 1417 wmb(); 1418 1419 iseg->byte_count = cpu_to_be32((1 << 31) | 4); 1420 } 1421 1422 static void set_data_seg(struct mlx4_wqe_data_seg *dseg, struct ib_sge *sg) 1423 { 1424 dseg->lkey = cpu_to_be32(sg->lkey); 1425 dseg->addr = cpu_to_be64(sg->addr); 1426 1427 /* 1428 * Need a barrier here before writing the byte_count field to 1429 * make sure that all the data is visible before the 1430 * byte_count field is set. Otherwise, if the segment begins 1431 * a new cacheline, the HCA prefetcher could grab the 64-byte 1432 * chunk and get a valid (!= * 0xffffffff) byte count but 1433 * stale data, and end up sending the wrong data. 1434 */ 1435 wmb(); 1436 1437 dseg->byte_count = cpu_to_be32(sg->length); 1438 } 1439 1440 static void __set_data_seg(struct mlx4_wqe_data_seg *dseg, struct ib_sge *sg) 1441 { 1442 dseg->byte_count = cpu_to_be32(sg->length); 1443 dseg->lkey = cpu_to_be32(sg->lkey); 1444 dseg->addr = cpu_to_be64(sg->addr); 1445 } 1446 1447 static int build_lso_seg(struct mlx4_wqe_lso_seg *wqe, struct ib_send_wr *wr, 1448 struct mlx4_ib_qp *qp, unsigned *lso_seg_len) 1449 { 1450 unsigned halign = ALIGN(sizeof *wqe + wr->wr.ud.hlen, 16); 1451 1452 /* 1453 * This is a temporary limitation and will be removed in 1454 * a forthcoming FW release: 1455 */ 1456 if (unlikely(halign > 64)) 1457 return -EINVAL; 1458 1459 if (unlikely(!(qp->flags & MLX4_IB_QP_LSO) && 1460 wr->num_sge > qp->sq.max_gs - (halign >> 4))) 1461 return -EINVAL; 1462 1463 memcpy(wqe->header, wr->wr.ud.header, wr->wr.ud.hlen); 1464 1465 /* make sure LSO header is written before overwriting stamping */ 1466 wmb(); 1467 1468 wqe->mss_hdr_size = cpu_to_be32((wr->wr.ud.mss - wr->wr.ud.hlen) << 16 | 1469 wr->wr.ud.hlen); 1470 1471 *lso_seg_len = halign; 1472 return 0; 1473 } 1474 1475 static __be32 send_ieth(struct ib_send_wr *wr) 1476 { 1477 switch (wr->opcode) { 1478 case IB_WR_SEND_WITH_IMM: 1479 case IB_WR_RDMA_WRITE_WITH_IMM: 1480 return wr->ex.imm_data; 1481 1482 case IB_WR_SEND_WITH_INV: 1483 return cpu_to_be32(wr->ex.invalidate_rkey); 1484 1485 default: 1486 return 0; 1487 } 1488 } 1489 1490 int mlx4_ib_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr, 1491 struct ib_send_wr **bad_wr) 1492 { 1493 struct mlx4_ib_qp *qp = to_mqp(ibqp); 1494 void *wqe; 1495 struct mlx4_wqe_ctrl_seg *ctrl; 1496 struct mlx4_wqe_data_seg *dseg; 1497 unsigned long flags; 1498 int nreq; 1499 int err = 0; 1500 unsigned ind; 1501 int uninitialized_var(stamp); 1502 int uninitialized_var(size); 1503 unsigned uninitialized_var(seglen); 1504 int i; 1505 1506 spin_lock_irqsave(&qp->sq.lock, flags); 1507 1508 ind = qp->sq_next_wqe; 1509 1510 for (nreq = 0; wr; ++nreq, wr = wr->next) { 1511 if (mlx4_wq_overflow(&qp->sq, nreq, qp->ibqp.send_cq)) { 1512 err = -ENOMEM; 1513 *bad_wr = wr; 1514 goto out; 1515 } 1516 1517 if (unlikely(wr->num_sge > qp->sq.max_gs)) { 1518 err = -EINVAL; 1519 *bad_wr = wr; 1520 goto out; 1521 } 1522 1523 ctrl = wqe = get_send_wqe(qp, ind & (qp->sq.wqe_cnt - 1)); 1524 qp->sq.wrid[(qp->sq.head + nreq) & (qp->sq.wqe_cnt - 1)] = wr->wr_id; 1525 1526 ctrl->srcrb_flags = 1527 (wr->send_flags & IB_SEND_SIGNALED ? 1528 cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE) : 0) | 1529 (wr->send_flags & IB_SEND_SOLICITED ? 1530 cpu_to_be32(MLX4_WQE_CTRL_SOLICITED) : 0) | 1531 ((wr->send_flags & IB_SEND_IP_CSUM) ? 1532 cpu_to_be32(MLX4_WQE_CTRL_IP_CSUM | 1533 MLX4_WQE_CTRL_TCP_UDP_CSUM) : 0) | 1534 qp->sq_signal_bits; 1535 1536 ctrl->imm = send_ieth(wr); 1537 1538 wqe += sizeof *ctrl; 1539 size = sizeof *ctrl / 16; 1540 1541 switch (ibqp->qp_type) { 1542 case IB_QPT_RC: 1543 case IB_QPT_UC: 1544 switch (wr->opcode) { 1545 case IB_WR_ATOMIC_CMP_AND_SWP: 1546 case IB_WR_ATOMIC_FETCH_AND_ADD: 1547 set_raddr_seg(wqe, wr->wr.atomic.remote_addr, 1548 wr->wr.atomic.rkey); 1549 wqe += sizeof (struct mlx4_wqe_raddr_seg); 1550 1551 set_atomic_seg(wqe, wr); 1552 wqe += sizeof (struct mlx4_wqe_atomic_seg); 1553 1554 size += (sizeof (struct mlx4_wqe_raddr_seg) + 1555 sizeof (struct mlx4_wqe_atomic_seg)) / 16; 1556 1557 break; 1558 1559 case IB_WR_RDMA_READ: 1560 case IB_WR_RDMA_WRITE: 1561 case IB_WR_RDMA_WRITE_WITH_IMM: 1562 set_raddr_seg(wqe, wr->wr.rdma.remote_addr, 1563 wr->wr.rdma.rkey); 1564 wqe += sizeof (struct mlx4_wqe_raddr_seg); 1565 size += sizeof (struct mlx4_wqe_raddr_seg) / 16; 1566 break; 1567 1568 case IB_WR_LOCAL_INV: 1569 set_local_inv_seg(wqe, wr->ex.invalidate_rkey); 1570 wqe += sizeof (struct mlx4_wqe_local_inval_seg); 1571 size += sizeof (struct mlx4_wqe_local_inval_seg) / 16; 1572 break; 1573 1574 case IB_WR_FAST_REG_MR: 1575 set_fmr_seg(wqe, wr); 1576 wqe += sizeof (struct mlx4_wqe_fmr_seg); 1577 size += sizeof (struct mlx4_wqe_fmr_seg) / 16; 1578 break; 1579 1580 default: 1581 /* No extra segments required for sends */ 1582 break; 1583 } 1584 break; 1585 1586 case IB_QPT_UD: 1587 set_datagram_seg(wqe, wr); 1588 wqe += sizeof (struct mlx4_wqe_datagram_seg); 1589 size += sizeof (struct mlx4_wqe_datagram_seg) / 16; 1590 1591 if (wr->opcode == IB_WR_LSO) { 1592 err = build_lso_seg(wqe, wr, qp, &seglen); 1593 if (unlikely(err)) { 1594 *bad_wr = wr; 1595 goto out; 1596 } 1597 wqe += seglen; 1598 size += seglen / 16; 1599 } 1600 break; 1601 1602 case IB_QPT_SMI: 1603 case IB_QPT_GSI: 1604 err = build_mlx_header(to_msqp(qp), wr, ctrl, &seglen); 1605 if (unlikely(err)) { 1606 *bad_wr = wr; 1607 goto out; 1608 } 1609 wqe += seglen; 1610 size += seglen / 16; 1611 break; 1612 1613 default: 1614 break; 1615 } 1616 1617 /* 1618 * Write data segments in reverse order, so as to 1619 * overwrite cacheline stamp last within each 1620 * cacheline. This avoids issues with WQE 1621 * prefetching. 1622 */ 1623 1624 dseg = wqe; 1625 dseg += wr->num_sge - 1; 1626 size += wr->num_sge * (sizeof (struct mlx4_wqe_data_seg) / 16); 1627 1628 /* Add one more inline data segment for ICRC for MLX sends */ 1629 if (unlikely(qp->ibqp.qp_type == IB_QPT_SMI || 1630 qp->ibqp.qp_type == IB_QPT_GSI)) { 1631 set_mlx_icrc_seg(dseg + 1); 1632 size += sizeof (struct mlx4_wqe_data_seg) / 16; 1633 } 1634 1635 for (i = wr->num_sge - 1; i >= 0; --i, --dseg) 1636 set_data_seg(dseg, wr->sg_list + i); 1637 1638 ctrl->fence_size = (wr->send_flags & IB_SEND_FENCE ? 1639 MLX4_WQE_CTRL_FENCE : 0) | size; 1640 1641 /* 1642 * Make sure descriptor is fully written before 1643 * setting ownership bit (because HW can start 1644 * executing as soon as we do). 1645 */ 1646 wmb(); 1647 1648 if (wr->opcode < 0 || wr->opcode >= ARRAY_SIZE(mlx4_ib_opcode)) { 1649 err = -EINVAL; 1650 goto out; 1651 } 1652 1653 ctrl->owner_opcode = mlx4_ib_opcode[wr->opcode] | 1654 (ind & qp->sq.wqe_cnt ? cpu_to_be32(1 << 31) : 0); 1655 1656 stamp = ind + qp->sq_spare_wqes; 1657 ind += DIV_ROUND_UP(size * 16, 1U << qp->sq.wqe_shift); 1658 1659 /* 1660 * We can improve latency by not stamping the last 1661 * send queue WQE until after ringing the doorbell, so 1662 * only stamp here if there are still more WQEs to post. 1663 * 1664 * Same optimization applies to padding with NOP wqe 1665 * in case of WQE shrinking (used to prevent wrap-around 1666 * in the middle of WR). 1667 */ 1668 if (wr->next) { 1669 stamp_send_wqe(qp, stamp, size * 16); 1670 ind = pad_wraparound(qp, ind); 1671 } 1672 1673 } 1674 1675 out: 1676 if (likely(nreq)) { 1677 qp->sq.head += nreq; 1678 1679 /* 1680 * Make sure that descriptors are written before 1681 * doorbell record. 1682 */ 1683 wmb(); 1684 1685 writel(qp->doorbell_qpn, 1686 to_mdev(ibqp->device)->uar_map + MLX4_SEND_DOORBELL); 1687 1688 /* 1689 * Make sure doorbells don't leak out of SQ spinlock 1690 * and reach the HCA out of order. 1691 */ 1692 mmiowb(); 1693 1694 stamp_send_wqe(qp, stamp, size * 16); 1695 1696 ind = pad_wraparound(qp, ind); 1697 qp->sq_next_wqe = ind; 1698 } 1699 1700 spin_unlock_irqrestore(&qp->sq.lock, flags); 1701 1702 return err; 1703 } 1704 1705 int mlx4_ib_post_recv(struct ib_qp *ibqp, struct ib_recv_wr *wr, 1706 struct ib_recv_wr **bad_wr) 1707 { 1708 struct mlx4_ib_qp *qp = to_mqp(ibqp); 1709 struct mlx4_wqe_data_seg *scat; 1710 unsigned long flags; 1711 int err = 0; 1712 int nreq; 1713 int ind; 1714 int i; 1715 1716 spin_lock_irqsave(&qp->rq.lock, flags); 1717 1718 ind = qp->rq.head & (qp->rq.wqe_cnt - 1); 1719 1720 for (nreq = 0; wr; ++nreq, wr = wr->next) { 1721 if (mlx4_wq_overflow(&qp->rq, nreq, qp->ibqp.send_cq)) { 1722 err = -ENOMEM; 1723 *bad_wr = wr; 1724 goto out; 1725 } 1726 1727 if (unlikely(wr->num_sge > qp->rq.max_gs)) { 1728 err = -EINVAL; 1729 *bad_wr = wr; 1730 goto out; 1731 } 1732 1733 scat = get_recv_wqe(qp, ind); 1734 1735 for (i = 0; i < wr->num_sge; ++i) 1736 __set_data_seg(scat + i, wr->sg_list + i); 1737 1738 if (i < qp->rq.max_gs) { 1739 scat[i].byte_count = 0; 1740 scat[i].lkey = cpu_to_be32(MLX4_INVALID_LKEY); 1741 scat[i].addr = 0; 1742 } 1743 1744 qp->rq.wrid[ind] = wr->wr_id; 1745 1746 ind = (ind + 1) & (qp->rq.wqe_cnt - 1); 1747 } 1748 1749 out: 1750 if (likely(nreq)) { 1751 qp->rq.head += nreq; 1752 1753 /* 1754 * Make sure that descriptors are written before 1755 * doorbell record. 1756 */ 1757 wmb(); 1758 1759 *qp->db.db = cpu_to_be32(qp->rq.head & 0xffff); 1760 } 1761 1762 spin_unlock_irqrestore(&qp->rq.lock, flags); 1763 1764 return err; 1765 } 1766 1767 static inline enum ib_qp_state to_ib_qp_state(enum mlx4_qp_state mlx4_state) 1768 { 1769 switch (mlx4_state) { 1770 case MLX4_QP_STATE_RST: return IB_QPS_RESET; 1771 case MLX4_QP_STATE_INIT: return IB_QPS_INIT; 1772 case MLX4_QP_STATE_RTR: return IB_QPS_RTR; 1773 case MLX4_QP_STATE_RTS: return IB_QPS_RTS; 1774 case MLX4_QP_STATE_SQ_DRAINING: 1775 case MLX4_QP_STATE_SQD: return IB_QPS_SQD; 1776 case MLX4_QP_STATE_SQER: return IB_QPS_SQE; 1777 case MLX4_QP_STATE_ERR: return IB_QPS_ERR; 1778 default: return -1; 1779 } 1780 } 1781 1782 static inline enum ib_mig_state to_ib_mig_state(int mlx4_mig_state) 1783 { 1784 switch (mlx4_mig_state) { 1785 case MLX4_QP_PM_ARMED: return IB_MIG_ARMED; 1786 case MLX4_QP_PM_REARM: return IB_MIG_REARM; 1787 case MLX4_QP_PM_MIGRATED: return IB_MIG_MIGRATED; 1788 default: return -1; 1789 } 1790 } 1791 1792 static int to_ib_qp_access_flags(int mlx4_flags) 1793 { 1794 int ib_flags = 0; 1795 1796 if (mlx4_flags & MLX4_QP_BIT_RRE) 1797 ib_flags |= IB_ACCESS_REMOTE_READ; 1798 if (mlx4_flags & MLX4_QP_BIT_RWE) 1799 ib_flags |= IB_ACCESS_REMOTE_WRITE; 1800 if (mlx4_flags & MLX4_QP_BIT_RAE) 1801 ib_flags |= IB_ACCESS_REMOTE_ATOMIC; 1802 1803 return ib_flags; 1804 } 1805 1806 static void to_ib_ah_attr(struct mlx4_dev *dev, struct ib_ah_attr *ib_ah_attr, 1807 struct mlx4_qp_path *path) 1808 { 1809 memset(ib_ah_attr, 0, sizeof *ib_ah_attr); 1810 ib_ah_attr->port_num = path->sched_queue & 0x40 ? 2 : 1; 1811 1812 if (ib_ah_attr->port_num == 0 || ib_ah_attr->port_num > dev->caps.num_ports) 1813 return; 1814 1815 ib_ah_attr->dlid = be16_to_cpu(path->rlid); 1816 ib_ah_attr->sl = (path->sched_queue >> 2) & 0xf; 1817 ib_ah_attr->src_path_bits = path->grh_mylmc & 0x7f; 1818 ib_ah_attr->static_rate = path->static_rate ? path->static_rate - 5 : 0; 1819 ib_ah_attr->ah_flags = (path->grh_mylmc & (1 << 7)) ? IB_AH_GRH : 0; 1820 if (ib_ah_attr->ah_flags) { 1821 ib_ah_attr->grh.sgid_index = path->mgid_index; 1822 ib_ah_attr->grh.hop_limit = path->hop_limit; 1823 ib_ah_attr->grh.traffic_class = 1824 (be32_to_cpu(path->tclass_flowlabel) >> 20) & 0xff; 1825 ib_ah_attr->grh.flow_label = 1826 be32_to_cpu(path->tclass_flowlabel) & 0xfffff; 1827 memcpy(ib_ah_attr->grh.dgid.raw, 1828 path->rgid, sizeof ib_ah_attr->grh.dgid.raw); 1829 } 1830 } 1831 1832 int mlx4_ib_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *qp_attr, int qp_attr_mask, 1833 struct ib_qp_init_attr *qp_init_attr) 1834 { 1835 struct mlx4_ib_dev *dev = to_mdev(ibqp->device); 1836 struct mlx4_ib_qp *qp = to_mqp(ibqp); 1837 struct mlx4_qp_context context; 1838 int mlx4_state; 1839 int err = 0; 1840 1841 mutex_lock(&qp->mutex); 1842 1843 if (qp->state == IB_QPS_RESET) { 1844 qp_attr->qp_state = IB_QPS_RESET; 1845 goto done; 1846 } 1847 1848 err = mlx4_qp_query(dev->dev, &qp->mqp, &context); 1849 if (err) { 1850 err = -EINVAL; 1851 goto out; 1852 } 1853 1854 mlx4_state = be32_to_cpu(context.flags) >> 28; 1855 1856 qp->state = to_ib_qp_state(mlx4_state); 1857 qp_attr->qp_state = qp->state; 1858 qp_attr->path_mtu = context.mtu_msgmax >> 5; 1859 qp_attr->path_mig_state = 1860 to_ib_mig_state((be32_to_cpu(context.flags) >> 11) & 0x3); 1861 qp_attr->qkey = be32_to_cpu(context.qkey); 1862 qp_attr->rq_psn = be32_to_cpu(context.rnr_nextrecvpsn) & 0xffffff; 1863 qp_attr->sq_psn = be32_to_cpu(context.next_send_psn) & 0xffffff; 1864 qp_attr->dest_qp_num = be32_to_cpu(context.remote_qpn) & 0xffffff; 1865 qp_attr->qp_access_flags = 1866 to_ib_qp_access_flags(be32_to_cpu(context.params2)); 1867 1868 if (qp->ibqp.qp_type == IB_QPT_RC || qp->ibqp.qp_type == IB_QPT_UC) { 1869 to_ib_ah_attr(dev->dev, &qp_attr->ah_attr, &context.pri_path); 1870 to_ib_ah_attr(dev->dev, &qp_attr->alt_ah_attr, &context.alt_path); 1871 qp_attr->alt_pkey_index = context.alt_path.pkey_index & 0x7f; 1872 qp_attr->alt_port_num = qp_attr->alt_ah_attr.port_num; 1873 } 1874 1875 qp_attr->pkey_index = context.pri_path.pkey_index & 0x7f; 1876 if (qp_attr->qp_state == IB_QPS_INIT) 1877 qp_attr->port_num = qp->port; 1878 else 1879 qp_attr->port_num = context.pri_path.sched_queue & 0x40 ? 2 : 1; 1880 1881 /* qp_attr->en_sqd_async_notify is only applicable in modify qp */ 1882 qp_attr->sq_draining = mlx4_state == MLX4_QP_STATE_SQ_DRAINING; 1883 1884 qp_attr->max_rd_atomic = 1 << ((be32_to_cpu(context.params1) >> 21) & 0x7); 1885 1886 qp_attr->max_dest_rd_atomic = 1887 1 << ((be32_to_cpu(context.params2) >> 21) & 0x7); 1888 qp_attr->min_rnr_timer = 1889 (be32_to_cpu(context.rnr_nextrecvpsn) >> 24) & 0x1f; 1890 qp_attr->timeout = context.pri_path.ackto >> 3; 1891 qp_attr->retry_cnt = (be32_to_cpu(context.params1) >> 16) & 0x7; 1892 qp_attr->rnr_retry = (be32_to_cpu(context.params1) >> 13) & 0x7; 1893 qp_attr->alt_timeout = context.alt_path.ackto >> 3; 1894 1895 done: 1896 qp_attr->cur_qp_state = qp_attr->qp_state; 1897 qp_attr->cap.max_recv_wr = qp->rq.wqe_cnt; 1898 qp_attr->cap.max_recv_sge = qp->rq.max_gs; 1899 1900 if (!ibqp->uobject) { 1901 qp_attr->cap.max_send_wr = qp->sq.wqe_cnt; 1902 qp_attr->cap.max_send_sge = qp->sq.max_gs; 1903 } else { 1904 qp_attr->cap.max_send_wr = 0; 1905 qp_attr->cap.max_send_sge = 0; 1906 } 1907 1908 /* 1909 * We don't support inline sends for kernel QPs (yet), and we 1910 * don't know what userspace's value should be. 1911 */ 1912 qp_attr->cap.max_inline_data = 0; 1913 1914 qp_init_attr->cap = qp_attr->cap; 1915 1916 qp_init_attr->create_flags = 0; 1917 if (qp->flags & MLX4_IB_QP_BLOCK_MULTICAST_LOOPBACK) 1918 qp_init_attr->create_flags |= IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK; 1919 1920 if (qp->flags & MLX4_IB_QP_LSO) 1921 qp_init_attr->create_flags |= IB_QP_CREATE_IPOIB_UD_LSO; 1922 1923 out: 1924 mutex_unlock(&qp->mutex); 1925 return err; 1926 } 1927 1928