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#include <linux/slab.h> 36 37#include <rdma/ib_cache.h> 38#include <rdma/ib_pack.h> 39 40#include <linux/mlx4/qp.h> 41 42#include "mlx4_ib.h" 43#include "user.h" 44 45enum { 46 MLX4_IB_ACK_REQ_FREQ = 8, 47}; 48 49enum { 50 MLX4_IB_DEFAULT_SCHED_QUEUE = 0x83, 51 MLX4_IB_DEFAULT_QP0_SCHED_QUEUE = 0x3f 52}; 53 54enum { 55 /* 56 * Largest possible UD header: send with GRH and immediate data. 57 */ 58 MLX4_IB_UD_HEADER_SIZE = 72, 59 MLX4_IB_LSO_HEADER_SPARE = 128, 60}; 61 62struct mlx4_ib_sqp { 63 struct mlx4_ib_qp qp; 64 int pkey_index; 65 u32 qkey; 66 u32 send_psn; 67 struct ib_ud_header ud_header; 68 u8 header_buf[MLX4_IB_UD_HEADER_SIZE]; 69}; 70 71enum { 72 MLX4_IB_MIN_SQ_STRIDE = 6, 73 MLX4_IB_CACHE_LINE_SIZE = 64, 74}; 75 76static const __be32 mlx4_ib_opcode[] = { 77 [IB_WR_SEND] = cpu_to_be32(MLX4_OPCODE_SEND), 78 [IB_WR_LSO] = cpu_to_be32(MLX4_OPCODE_LSO), 79 [IB_WR_SEND_WITH_IMM] = cpu_to_be32(MLX4_OPCODE_SEND_IMM), 80 [IB_WR_RDMA_WRITE] = cpu_to_be32(MLX4_OPCODE_RDMA_WRITE), 81 [IB_WR_RDMA_WRITE_WITH_IMM] = cpu_to_be32(MLX4_OPCODE_RDMA_WRITE_IMM), 82 [IB_WR_RDMA_READ] = cpu_to_be32(MLX4_OPCODE_RDMA_READ), 83 [IB_WR_ATOMIC_CMP_AND_SWP] = cpu_to_be32(MLX4_OPCODE_ATOMIC_CS), 84 [IB_WR_ATOMIC_FETCH_AND_ADD] = cpu_to_be32(MLX4_OPCODE_ATOMIC_FA), 85 [IB_WR_SEND_WITH_INV] = cpu_to_be32(MLX4_OPCODE_SEND_INVAL), 86 [IB_WR_LOCAL_INV] = cpu_to_be32(MLX4_OPCODE_LOCAL_INVAL), 87 [IB_WR_FAST_REG_MR] = cpu_to_be32(MLX4_OPCODE_FMR), 88 [IB_WR_MASKED_ATOMIC_CMP_AND_SWP] = cpu_to_be32(MLX4_OPCODE_MASKED_ATOMIC_CS), 89 [IB_WR_MASKED_ATOMIC_FETCH_AND_ADD] = cpu_to_be32(MLX4_OPCODE_MASKED_ATOMIC_FA), 90}; 91 92static struct mlx4_ib_sqp *to_msqp(struct mlx4_ib_qp *mqp) 93{ 94 return container_of(mqp, struct mlx4_ib_sqp, qp); 95} 96 97static int is_sqp(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp) 98{ 99 return qp->mqp.qpn >= dev->dev->caps.sqp_start && 100 qp->mqp.qpn <= dev->dev->caps.sqp_start + 3; 101} 102 103static int is_qp0(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp) 104{ 105 return qp->mqp.qpn >= dev->dev->caps.sqp_start && 106 qp->mqp.qpn <= dev->dev->caps.sqp_start + 1; 107} 108 109static void *get_wqe(struct mlx4_ib_qp *qp, int offset) 110{ 111 return mlx4_buf_offset(&qp->buf, offset); 112} 113 114static void *get_recv_wqe(struct mlx4_ib_qp *qp, int n) 115{ 116 return get_wqe(qp, qp->rq.offset + (n << qp->rq.wqe_shift)); 117} 118 119static void *get_send_wqe(struct mlx4_ib_qp *qp, int n) 120{ 121 return get_wqe(qp, qp->sq.offset + (n << qp->sq.wqe_shift)); 122} 123 124/* 125 * Stamp a SQ WQE so that it is invalid if prefetched by marking the 126 * first four bytes of every 64 byte chunk with 127 * 0x7FFFFFF | (invalid_ownership_value << 31). 128 * 129 * When the max work request size is less than or equal to the WQE 130 * basic block size, as an optimization, we can stamp all WQEs with 131 * 0xffffffff, and skip the very first chunk of each WQE. 132 */ 133static void stamp_send_wqe(struct mlx4_ib_qp *qp, int n, int size) 134{ 135 __be32 *wqe; 136 int i; 137 int s; 138 int ind; 139 void *buf; 140 __be32 stamp; 141 struct mlx4_wqe_ctrl_seg *ctrl; 142 143 if (qp->sq_max_wqes_per_wr > 1) { 144 s = roundup(size, 1U << qp->sq.wqe_shift); 145 for (i = 0; i < s; i += 64) { 146 ind = (i >> qp->sq.wqe_shift) + n; 147 stamp = ind & qp->sq.wqe_cnt ? cpu_to_be32(0x7fffffff) : 148 cpu_to_be32(0xffffffff); 149 buf = get_send_wqe(qp, ind & (qp->sq.wqe_cnt - 1)); 150 wqe = buf + (i & ((1 << qp->sq.wqe_shift) - 1)); 151 *wqe = stamp; 152 } 153 } else { 154 ctrl = buf = get_send_wqe(qp, n & (qp->sq.wqe_cnt - 1)); 155 s = (ctrl->fence_size & 0x3f) << 4; 156 for (i = 64; i < s; i += 64) { 157 wqe = buf + i; 158 *wqe = cpu_to_be32(0xffffffff); 159 } 160 } 161} 162 163static void post_nop_wqe(struct mlx4_ib_qp *qp, int n, int size) 164{ 165 struct mlx4_wqe_ctrl_seg *ctrl; 166 struct mlx4_wqe_inline_seg *inl; 167 void *wqe; 168 int s; 169 170 ctrl = wqe = get_send_wqe(qp, n & (qp->sq.wqe_cnt - 1)); 171 s = sizeof(struct mlx4_wqe_ctrl_seg); 172 173 if (qp->ibqp.qp_type == IB_QPT_UD) { 174 struct mlx4_wqe_datagram_seg *dgram = wqe + sizeof *ctrl; 175 struct mlx4_av *av = (struct mlx4_av *)dgram->av; 176 memset(dgram, 0, sizeof *dgram); 177 av->port_pd = cpu_to_be32((qp->port << 24) | to_mpd(qp->ibqp.pd)->pdn); 178 s += sizeof(struct mlx4_wqe_datagram_seg); 179 } 180 181 /* Pad the remainder of the WQE with an inline data segment. */ 182 if (size > s) { 183 inl = wqe + s; 184 inl->byte_count = cpu_to_be32(1 << 31 | (size - s - sizeof *inl)); 185 } 186 ctrl->srcrb_flags = 0; 187 ctrl->fence_size = size / 16; 188 /* 189 * Make sure descriptor is fully written before setting ownership bit 190 * (because HW can start executing as soon as we do). 191 */ 192 wmb(); 193 194 ctrl->owner_opcode = cpu_to_be32(MLX4_OPCODE_NOP | MLX4_WQE_CTRL_NEC) | 195 (n & qp->sq.wqe_cnt ? cpu_to_be32(1 << 31) : 0); 196 197 stamp_send_wqe(qp, n + qp->sq_spare_wqes, size); 198} 199 200/* Post NOP WQE to prevent wrap-around in the middle of WR */ 201static inline unsigned pad_wraparound(struct mlx4_ib_qp *qp, int ind) 202{ 203 unsigned s = qp->sq.wqe_cnt - (ind & (qp->sq.wqe_cnt - 1)); 204 if (unlikely(s < qp->sq_max_wqes_per_wr)) { 205 post_nop_wqe(qp, ind, s << qp->sq.wqe_shift); 206 ind += s; 207 } 208 return ind; 209} 210 211static void mlx4_ib_qp_event(struct mlx4_qp *qp, enum mlx4_event type) 212{ 213 struct ib_event event; 214 struct ib_qp *ibqp = &to_mibqp(qp)->ibqp; 215 216 if (type == MLX4_EVENT_TYPE_PATH_MIG) 217 to_mibqp(qp)->port = to_mibqp(qp)->alt_port; 218 219 if (ibqp->event_handler) { 220 event.device = ibqp->device; 221 event.element.qp = ibqp; 222 switch (type) { 223 case MLX4_EVENT_TYPE_PATH_MIG: 224 event.event = IB_EVENT_PATH_MIG; 225 break; 226 case MLX4_EVENT_TYPE_COMM_EST: 227 event.event = IB_EVENT_COMM_EST; 228 break; 229 case MLX4_EVENT_TYPE_SQ_DRAINED: 230 event.event = IB_EVENT_SQ_DRAINED; 231 break; 232 case MLX4_EVENT_TYPE_SRQ_QP_LAST_WQE: 233 event.event = IB_EVENT_QP_LAST_WQE_REACHED; 234 break; 235 case MLX4_EVENT_TYPE_WQ_CATAS_ERROR: 236 event.event = IB_EVENT_QP_FATAL; 237 break; 238 case MLX4_EVENT_TYPE_PATH_MIG_FAILED: 239 event.event = IB_EVENT_PATH_MIG_ERR; 240 break; 241 case MLX4_EVENT_TYPE_WQ_INVAL_REQ_ERROR: 242 event.event = IB_EVENT_QP_REQ_ERR; 243 break; 244 case MLX4_EVENT_TYPE_WQ_ACCESS_ERROR: 245 event.event = IB_EVENT_QP_ACCESS_ERR; 246 break; 247 default: 248 printk(KERN_WARNING "mlx4_ib: Unexpected event type %d " 249 "on QP %06x\n", type, qp->qpn); 250 return; 251 } 252 253 ibqp->event_handler(&event, ibqp->qp_context); 254 } 255} 256 257static int send_wqe_overhead(enum ib_qp_type type, u32 flags) 258{ 259 /* 260 * UD WQEs must have a datagram segment. 261 * RC and UC WQEs might have a remote address segment. 262 * MLX WQEs need two extra inline data segments (for the UD 263 * header and space for the ICRC). 264 */ 265 switch (type) { 266 case IB_QPT_UD: 267 return sizeof (struct mlx4_wqe_ctrl_seg) + 268 sizeof (struct mlx4_wqe_datagram_seg) + 269 ((flags & MLX4_IB_QP_LSO) ? MLX4_IB_LSO_HEADER_SPARE : 0); 270 case IB_QPT_UC: 271 return sizeof (struct mlx4_wqe_ctrl_seg) + 272 sizeof (struct mlx4_wqe_raddr_seg); 273 case IB_QPT_RC: 274 return sizeof (struct mlx4_wqe_ctrl_seg) + 275 sizeof (struct mlx4_wqe_atomic_seg) + 276 sizeof (struct mlx4_wqe_raddr_seg); 277 case IB_QPT_SMI: 278 case IB_QPT_GSI: 279 return sizeof (struct mlx4_wqe_ctrl_seg) + 280 ALIGN(MLX4_IB_UD_HEADER_SIZE + 281 DIV_ROUND_UP(MLX4_IB_UD_HEADER_SIZE, 282 MLX4_INLINE_ALIGN) * 283 sizeof (struct mlx4_wqe_inline_seg), 284 sizeof (struct mlx4_wqe_data_seg)) + 285 ALIGN(4 + 286 sizeof (struct mlx4_wqe_inline_seg), 287 sizeof (struct mlx4_wqe_data_seg)); 288 default: 289 return sizeof (struct mlx4_wqe_ctrl_seg); 290 } 291} 292 293static int set_rq_size(struct mlx4_ib_dev *dev, struct ib_qp_cap *cap, 294 int is_user, int has_srq, struct mlx4_ib_qp *qp) 295{ 296 /* Sanity check RQ size before proceeding */ 297 if (cap->max_recv_wr > dev->dev->caps.max_wqes || 298 cap->max_recv_sge > dev->dev->caps.max_rq_sg) 299 return -EINVAL; 300 301 if (has_srq) { 302 /* QPs attached to an SRQ should have no RQ */ 303 if (cap->max_recv_wr) 304 return -EINVAL; 305 306 qp->rq.wqe_cnt = qp->rq.max_gs = 0; 307 } else { 308 /* HW requires >= 1 RQ entry with >= 1 gather entry */ 309 if (is_user && (!cap->max_recv_wr || !cap->max_recv_sge)) 310 return -EINVAL; 311 312 qp->rq.wqe_cnt = roundup_pow_of_two(max(1U, cap->max_recv_wr)); 313 qp->rq.max_gs = roundup_pow_of_two(max(1U, cap->max_recv_sge)); 314 qp->rq.wqe_shift = ilog2(qp->rq.max_gs * sizeof (struct mlx4_wqe_data_seg)); 315 } 316 317 cap->max_recv_wr = qp->rq.max_post = qp->rq.wqe_cnt; 318 cap->max_recv_sge = qp->rq.max_gs; 319 320 return 0; 321} 322 323static int set_kernel_sq_size(struct mlx4_ib_dev *dev, struct ib_qp_cap *cap, 324 enum ib_qp_type type, struct mlx4_ib_qp *qp) 325{ 326 int s; 327 328 /* Sanity check SQ size before proceeding */ 329 if (cap->max_send_wr > dev->dev->caps.max_wqes || 330 cap->max_send_sge > dev->dev->caps.max_sq_sg || 331 cap->max_inline_data + send_wqe_overhead(type, qp->flags) + 332 sizeof (struct mlx4_wqe_inline_seg) > dev->dev->caps.max_sq_desc_sz) 333 return -EINVAL; 334 335 /* 336 * For MLX transport we need 2 extra S/G entries: 337 * one for the header and one for the checksum at the end 338 */ 339 if ((type == IB_QPT_SMI || type == IB_QPT_GSI) && 340 cap->max_send_sge + 2 > dev->dev->caps.max_sq_sg) 341 return -EINVAL; 342 343 s = max(cap->max_send_sge * sizeof (struct mlx4_wqe_data_seg), 344 cap->max_inline_data + sizeof (struct mlx4_wqe_inline_seg)) + 345 send_wqe_overhead(type, qp->flags); 346 347 if (s > dev->dev->caps.max_sq_desc_sz) 348 return -EINVAL; 349 350 /* 351 * Hermon supports shrinking WQEs, such that a single work 352 * request can include multiple units of 1 << wqe_shift. This 353 * way, work requests can differ in size, and do not have to 354 * be a power of 2 in size, saving memory and speeding up send 355 * WR posting. Unfortunately, if we do this then the 356 * wqe_index field in CQEs can't be used to look up the WR ID 357 * anymore, so we do this only if selective signaling is off. 358 * 359 * Further, on 32-bit platforms, we can't use vmap() to make 360 * the QP buffer virtually contiguous. Thus we have to use 361 * constant-sized WRs to make sure a WR is always fully within 362 * a single page-sized chunk. 363 * 364 * Finally, we use NOP work requests to pad the end of the 365 * work queue, to avoid wrap-around in the middle of WR. We 366 * set NEC bit to avoid getting completions with error for 367 * these NOP WRs, but since NEC is only supported starting 368 * with firmware 2.2.232, we use constant-sized WRs for older 369 * firmware. 370 * 371 * And, since MLX QPs only support SEND, we use constant-sized 372 * WRs in this case. 373 * 374 * We look for the smallest value of wqe_shift such that the 375 * resulting number of wqes does not exceed device 376 * capabilities. 377 * 378 * We set WQE size to at least 64 bytes, this way stamping 379 * invalidates each WQE. 380 */ 381 if (dev->dev->caps.fw_ver >= MLX4_FW_VER_WQE_CTRL_NEC && 382 qp->sq_signal_bits && BITS_PER_LONG == 64 && 383 type != IB_QPT_SMI && type != IB_QPT_GSI) 384 qp->sq.wqe_shift = ilog2(64); 385 else 386 qp->sq.wqe_shift = ilog2(roundup_pow_of_two(s)); 387 388 for (;;) { 389 qp->sq_max_wqes_per_wr = DIV_ROUND_UP(s, 1U << qp->sq.wqe_shift); 390 391 /* 392 * We need to leave 2 KB + 1 WR of headroom in the SQ to 393 * allow HW to prefetch. 394 */ 395 qp->sq_spare_wqes = (2048 >> qp->sq.wqe_shift) + qp->sq_max_wqes_per_wr; 396 qp->sq.wqe_cnt = roundup_pow_of_two(cap->max_send_wr * 397 qp->sq_max_wqes_per_wr + 398 qp->sq_spare_wqes); 399 400 if (qp->sq.wqe_cnt <= dev->dev->caps.max_wqes) 401 break; 402 403 if (qp->sq_max_wqes_per_wr <= 1) 404 return -EINVAL; 405 406 ++qp->sq.wqe_shift; 407 } 408 409 qp->sq.max_gs = (min(dev->dev->caps.max_sq_desc_sz, 410 (qp->sq_max_wqes_per_wr << qp->sq.wqe_shift)) - 411 send_wqe_overhead(type, qp->flags)) / 412 sizeof (struct mlx4_wqe_data_seg); 413 414 qp->buf_size = (qp->rq.wqe_cnt << qp->rq.wqe_shift) + 415 (qp->sq.wqe_cnt << qp->sq.wqe_shift); 416 if (qp->rq.wqe_shift > qp->sq.wqe_shift) { 417 qp->rq.offset = 0; 418 qp->sq.offset = qp->rq.wqe_cnt << qp->rq.wqe_shift; 419 } else { 420 qp->rq.offset = qp->sq.wqe_cnt << qp->sq.wqe_shift; 421 qp->sq.offset = 0; 422 } 423 424 cap->max_send_wr = qp->sq.max_post = 425 (qp->sq.wqe_cnt - qp->sq_spare_wqes) / qp->sq_max_wqes_per_wr; 426 cap->max_send_sge = min(qp->sq.max_gs, 427 min(dev->dev->caps.max_sq_sg, 428 dev->dev->caps.max_rq_sg)); 429 /* We don't support inline sends for kernel QPs (yet) */ 430 cap->max_inline_data = 0; 431 432 return 0; 433} 434 435static int set_user_sq_size(struct mlx4_ib_dev *dev, 436 struct mlx4_ib_qp *qp, 437 struct mlx4_ib_create_qp *ucmd) 438{ 439 /* Sanity check SQ size before proceeding */ 440 if ((1 << ucmd->log_sq_bb_count) > dev->dev->caps.max_wqes || 441 ucmd->log_sq_stride > 442 ilog2(roundup_pow_of_two(dev->dev->caps.max_sq_desc_sz)) || 443 ucmd->log_sq_stride < MLX4_IB_MIN_SQ_STRIDE) 444 return -EINVAL; 445 446 qp->sq.wqe_cnt = 1 << ucmd->log_sq_bb_count; 447 qp->sq.wqe_shift = ucmd->log_sq_stride; 448 449 qp->buf_size = (qp->rq.wqe_cnt << qp->rq.wqe_shift) + 450 (qp->sq.wqe_cnt << qp->sq.wqe_shift); 451 452 return 0; 453} 454 455static int create_qp_common(struct mlx4_ib_dev *dev, struct ib_pd *pd, 456 struct ib_qp_init_attr *init_attr, 457 struct ib_udata *udata, int sqpn, struct mlx4_ib_qp *qp) 458{ 459 int qpn; 460 int err; 461 462 mutex_init(&qp->mutex); 463 spin_lock_init(&qp->sq.lock); 464 spin_lock_init(&qp->rq.lock); 465 466 qp->state = IB_QPS_RESET; 467 if (init_attr->sq_sig_type == IB_SIGNAL_ALL_WR) 468 qp->sq_signal_bits = cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE); 469 470 err = set_rq_size(dev, &init_attr->cap, !!pd->uobject, !!init_attr->srq, qp); 471 if (err) 472 goto err; 473 474 if (pd->uobject) { 475 struct mlx4_ib_create_qp ucmd; 476 477 if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) { 478 err = -EFAULT; 479 goto err; 480 } 481 482 qp->sq_no_prefetch = ucmd.sq_no_prefetch; 483 484 err = set_user_sq_size(dev, qp, &ucmd); 485 if (err) 486 goto err; 487 488 qp->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr, 489 qp->buf_size, 0, 0); 490 if (IS_ERR(qp->umem)) { 491 err = PTR_ERR(qp->umem); 492 goto err; 493 } 494 495 err = mlx4_mtt_init(dev->dev, ib_umem_page_count(qp->umem), 496 ilog2(qp->umem->page_size), &qp->mtt); 497 if (err) 498 goto err_buf; 499 500 err = mlx4_ib_umem_write_mtt(dev, &qp->mtt, qp->umem); 501 if (err) 502 goto err_mtt; 503 504 if (!init_attr->srq) { 505 err = mlx4_ib_db_map_user(to_mucontext(pd->uobject->context), 506 ucmd.db_addr, &qp->db); 507 if (err) 508 goto err_mtt; 509 } 510 } else { 511 qp->sq_no_prefetch = 0; 512 513 if (init_attr->create_flags & IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK) 514 qp->flags |= MLX4_IB_QP_BLOCK_MULTICAST_LOOPBACK; 515 516 if (init_attr->create_flags & IB_QP_CREATE_IPOIB_UD_LSO) 517 qp->flags |= MLX4_IB_QP_LSO; 518 519 err = set_kernel_sq_size(dev, &init_attr->cap, init_attr->qp_type, qp); 520 if (err) 521 goto err; 522 523 if (!init_attr->srq) { 524 err = mlx4_db_alloc(dev->dev, &qp->db, 0); 525 if (err) 526 goto err; 527 528 *qp->db.db = 0; 529 } 530 531 if (mlx4_buf_alloc(dev->dev, qp->buf_size, PAGE_SIZE * 2, &qp->buf)) { 532 err = -ENOMEM; 533 goto err_db; 534 } 535 536 err = mlx4_mtt_init(dev->dev, qp->buf.npages, qp->buf.page_shift, 537 &qp->mtt); 538 if (err) 539 goto err_buf; 540 541 err = mlx4_buf_write_mtt(dev->dev, &qp->mtt, &qp->buf); 542 if (err) 543 goto err_mtt; 544 545 qp->sq.wrid = kmalloc(qp->sq.wqe_cnt * sizeof (u64), GFP_KERNEL); 546 qp->rq.wrid = kmalloc(qp->rq.wqe_cnt * sizeof (u64), GFP_KERNEL); 547 548 if (!qp->sq.wrid || !qp->rq.wrid) { 549 err = -ENOMEM; 550 goto err_wrid; 551 } 552 } 553 554 if (sqpn) { 555 qpn = sqpn; 556 } else { 557 err = mlx4_qp_reserve_range(dev->dev, 1, 1, &qpn); 558 if (err) 559 goto err_wrid; 560 } 561 562 err = mlx4_qp_alloc(dev->dev, qpn, &qp->mqp); 563 if (err) 564 goto err_qpn; 565 566 /* 567 * Hardware wants QPN written in big-endian order (after 568 * shifting) for send doorbell. Precompute this value to save 569 * a little bit when posting sends. 570 */ 571 qp->doorbell_qpn = swab32(qp->mqp.qpn << 8); 572 573 qp->mqp.event = mlx4_ib_qp_event; 574 575 return 0; 576 577err_qpn: 578 if (!sqpn) 579 mlx4_qp_release_range(dev->dev, qpn, 1); 580 581err_wrid: 582 if (pd->uobject) { 583 if (!init_attr->srq) 584 mlx4_ib_db_unmap_user(to_mucontext(pd->uobject->context), 585 &qp->db); 586 } else { 587 kfree(qp->sq.wrid); 588 kfree(qp->rq.wrid); 589 } 590 591err_mtt: 592 mlx4_mtt_cleanup(dev->dev, &qp->mtt); 593 594err_buf: 595 if (pd->uobject) 596 ib_umem_release(qp->umem); 597 else 598 mlx4_buf_free(dev->dev, qp->buf_size, &qp->buf); 599 600err_db: 601 if (!pd->uobject && !init_attr->srq) 602 mlx4_db_free(dev->dev, &qp->db); 603 604err: 605 return err; 606} 607 608static enum mlx4_qp_state to_mlx4_state(enum ib_qp_state state) 609{ 610 switch (state) { 611 case IB_QPS_RESET: return MLX4_QP_STATE_RST; 612 case IB_QPS_INIT: return MLX4_QP_STATE_INIT; 613 case IB_QPS_RTR: return MLX4_QP_STATE_RTR; 614 case IB_QPS_RTS: return MLX4_QP_STATE_RTS; 615 case IB_QPS_SQD: return MLX4_QP_STATE_SQD; 616 case IB_QPS_SQE: return MLX4_QP_STATE_SQER; 617 case IB_QPS_ERR: return MLX4_QP_STATE_ERR; 618 default: return -1; 619 } 620} 621 622static void mlx4_ib_lock_cqs(struct mlx4_ib_cq *send_cq, struct mlx4_ib_cq *recv_cq) 623 __acquires(&send_cq->lock) __acquires(&recv_cq->lock) 624{ 625 if (send_cq == recv_cq) { 626 spin_lock_irq(&send_cq->lock); 627 __acquire(&recv_cq->lock); 628 } else if (send_cq->mcq.cqn < recv_cq->mcq.cqn) { 629 spin_lock_irq(&send_cq->lock); 630 spin_lock_nested(&recv_cq->lock, SINGLE_DEPTH_NESTING); 631 } else { 632 spin_lock_irq(&recv_cq->lock); 633 spin_lock_nested(&send_cq->lock, SINGLE_DEPTH_NESTING); 634 } 635} 636 637static void mlx4_ib_unlock_cqs(struct mlx4_ib_cq *send_cq, struct mlx4_ib_cq *recv_cq) 638 __releases(&send_cq->lock) __releases(&recv_cq->lock) 639{ 640 if (send_cq == recv_cq) { 641 __release(&recv_cq->lock); 642 spin_unlock_irq(&send_cq->lock); 643 } else if (send_cq->mcq.cqn < recv_cq->mcq.cqn) { 644 spin_unlock(&recv_cq->lock); 645 spin_unlock_irq(&send_cq->lock); 646 } else { 647 spin_unlock(&send_cq->lock); 648 spin_unlock_irq(&recv_cq->lock); 649 } 650} 651 652static void destroy_qp_common(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp, 653 int is_user) 654{ 655 struct mlx4_ib_cq *send_cq, *recv_cq; 656 657 if (qp->state != IB_QPS_RESET) 658 if (mlx4_qp_modify(dev->dev, NULL, to_mlx4_state(qp->state), 659 MLX4_QP_STATE_RST, NULL, 0, 0, &qp->mqp)) 660 printk(KERN_WARNING "mlx4_ib: modify QP %06x to RESET failed.\n", 661 qp->mqp.qpn); 662 663 send_cq = to_mcq(qp->ibqp.send_cq); 664 recv_cq = to_mcq(qp->ibqp.recv_cq); 665 666 mlx4_ib_lock_cqs(send_cq, recv_cq); 667 668 if (!is_user) { 669 __mlx4_ib_cq_clean(recv_cq, qp->mqp.qpn, 670 qp->ibqp.srq ? to_msrq(qp->ibqp.srq): NULL); 671 if (send_cq != recv_cq) 672 __mlx4_ib_cq_clean(send_cq, qp->mqp.qpn, NULL); 673 } 674 675 mlx4_qp_remove(dev->dev, &qp->mqp); 676 677 mlx4_ib_unlock_cqs(send_cq, recv_cq); 678 679 mlx4_qp_free(dev->dev, &qp->mqp); 680 681 if (!is_sqp(dev, qp)) 682 mlx4_qp_release_range(dev->dev, qp->mqp.qpn, 1); 683 684 mlx4_mtt_cleanup(dev->dev, &qp->mtt); 685 686 if (is_user) { 687 if (!qp->ibqp.srq) 688 mlx4_ib_db_unmap_user(to_mucontext(qp->ibqp.uobject->context), 689 &qp->db); 690 ib_umem_release(qp->umem); 691 } else { 692 kfree(qp->sq.wrid); 693 kfree(qp->rq.wrid); 694 mlx4_buf_free(dev->dev, qp->buf_size, &qp->buf); 695 if (!qp->ibqp.srq) 696 mlx4_db_free(dev->dev, &qp->db); 697 } 698} 699 700struct ib_qp *mlx4_ib_create_qp(struct ib_pd *pd, 701 struct ib_qp_init_attr *init_attr, 702 struct ib_udata *udata) 703{ 704 struct mlx4_ib_dev *dev = to_mdev(pd->device); 705 struct mlx4_ib_sqp *sqp; 706 struct mlx4_ib_qp *qp; 707 int err; 708 709 /* 710 * We only support LSO and multicast loopback blocking, and 711 * only for kernel UD QPs. 712 */ 713 if (init_attr->create_flags & ~(IB_QP_CREATE_IPOIB_UD_LSO | 714 IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK)) 715 return ERR_PTR(-EINVAL); 716 717 if (init_attr->create_flags && 718 (pd->uobject || init_attr->qp_type != IB_QPT_UD)) 719 return ERR_PTR(-EINVAL); 720 721 switch (init_attr->qp_type) { 722 case IB_QPT_RC: 723 case IB_QPT_UC: 724 case IB_QPT_UD: 725 { 726 qp = kzalloc(sizeof *qp, GFP_KERNEL); 727 if (!qp) 728 return ERR_PTR(-ENOMEM); 729 730 err = create_qp_common(dev, pd, init_attr, udata, 0, qp); 731 if (err) { 732 kfree(qp); 733 return ERR_PTR(err); 734 } 735 736 qp->ibqp.qp_num = qp->mqp.qpn; 737 738 break; 739 } 740 case IB_QPT_SMI: 741 case IB_QPT_GSI: 742 { 743 /* Userspace is not allowed to create special QPs: */ 744 if (pd->uobject) 745 return ERR_PTR(-EINVAL); 746 747 sqp = kzalloc(sizeof *sqp, GFP_KERNEL); 748 if (!sqp) 749 return ERR_PTR(-ENOMEM); 750 751 qp = &sqp->qp; 752 753 err = create_qp_common(dev, pd, init_attr, udata, 754 dev->dev->caps.sqp_start + 755 (init_attr->qp_type == IB_QPT_SMI ? 0 : 2) + 756 init_attr->port_num - 1, 757 qp); 758 if (err) { 759 kfree(sqp); 760 return ERR_PTR(err); 761 } 762 763 qp->port = init_attr->port_num; 764 qp->ibqp.qp_num = init_attr->qp_type == IB_QPT_SMI ? 0 : 1; 765 766 break; 767 } 768 default: 769 /* Don't support raw QPs */ 770 return ERR_PTR(-EINVAL); 771 } 772 773 return &qp->ibqp; 774} 775 776int mlx4_ib_destroy_qp(struct ib_qp *qp) 777{ 778 struct mlx4_ib_dev *dev = to_mdev(qp->device); 779 struct mlx4_ib_qp *mqp = to_mqp(qp); 780 781 if (is_qp0(dev, mqp)) 782 mlx4_CLOSE_PORT(dev->dev, mqp->port); 783 784 destroy_qp_common(dev, mqp, !!qp->pd->uobject); 785 786 if (is_sqp(dev, mqp)) 787 kfree(to_msqp(mqp)); 788 else 789 kfree(mqp); 790 791 return 0; 792} 793 794static int to_mlx4_st(enum ib_qp_type type) 795{ 796 switch (type) { 797 case IB_QPT_RC: return MLX4_QP_ST_RC; 798 case IB_QPT_UC: return MLX4_QP_ST_UC; 799 case IB_QPT_UD: return MLX4_QP_ST_UD; 800 case IB_QPT_SMI: 801 case IB_QPT_GSI: return MLX4_QP_ST_MLX; 802 default: return -1; 803 } 804} 805 806static __be32 to_mlx4_access_flags(struct mlx4_ib_qp *qp, const struct ib_qp_attr *attr, 807 int attr_mask) 808{ 809 u8 dest_rd_atomic; 810 u32 access_flags; 811 u32 hw_access_flags = 0; 812 813 if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC) 814 dest_rd_atomic = attr->max_dest_rd_atomic; 815 else 816 dest_rd_atomic = qp->resp_depth; 817 818 if (attr_mask & IB_QP_ACCESS_FLAGS) 819 access_flags = attr->qp_access_flags; 820 else 821 access_flags = qp->atomic_rd_en; 822 823 if (!dest_rd_atomic) 824 access_flags &= IB_ACCESS_REMOTE_WRITE; 825 826 if (access_flags & IB_ACCESS_REMOTE_READ) 827 hw_access_flags |= MLX4_QP_BIT_RRE; 828 if (access_flags & IB_ACCESS_REMOTE_ATOMIC) 829 hw_access_flags |= MLX4_QP_BIT_RAE; 830 if (access_flags & IB_ACCESS_REMOTE_WRITE) 831 hw_access_flags |= MLX4_QP_BIT_RWE; 832 833 return cpu_to_be32(hw_access_flags); 834} 835 836static void store_sqp_attrs(struct mlx4_ib_sqp *sqp, const struct ib_qp_attr *attr, 837 int attr_mask) 838{ 839 if (attr_mask & IB_QP_PKEY_INDEX) 840 sqp->pkey_index = attr->pkey_index; 841 if (attr_mask & IB_QP_QKEY) 842 sqp->qkey = attr->qkey; 843 if (attr_mask & IB_QP_SQ_PSN) 844 sqp->send_psn = attr->sq_psn; 845} 846 847static void mlx4_set_sched(struct mlx4_qp_path *path, u8 port) 848{ 849 path->sched_queue = (path->sched_queue & 0xbf) | ((port - 1) << 6); 850} 851 852static int mlx4_set_path(struct mlx4_ib_dev *dev, const struct ib_ah_attr *ah, 853 struct mlx4_qp_path *path, u8 port) 854{ 855 path->grh_mylmc = ah->src_path_bits & 0x7f; 856 path->rlid = cpu_to_be16(ah->dlid); 857 if (ah->static_rate) { 858 path->static_rate = ah->static_rate + MLX4_STAT_RATE_OFFSET; 859 while (path->static_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET && 860 !(1 << path->static_rate & dev->dev->caps.stat_rate_support)) 861 --path->static_rate; 862 } else 863 path->static_rate = 0; 864 path->counter_index = 0xff; 865 866 if (ah->ah_flags & IB_AH_GRH) { 867 if (ah->grh.sgid_index >= dev->dev->caps.gid_table_len[port]) { 868 printk(KERN_ERR "sgid_index (%u) too large. max is %d\n", 869 ah->grh.sgid_index, dev->dev->caps.gid_table_len[port] - 1); 870 return -1; 871 } 872 873 path->grh_mylmc |= 1 << 7; 874 path->mgid_index = ah->grh.sgid_index; 875 path->hop_limit = ah->grh.hop_limit; 876 path->tclass_flowlabel = 877 cpu_to_be32((ah->grh.traffic_class << 20) | 878 (ah->grh.flow_label)); 879 memcpy(path->rgid, ah->grh.dgid.raw, 16); 880 } 881 882 path->sched_queue = MLX4_IB_DEFAULT_SCHED_QUEUE | 883 ((port - 1) << 6) | ((ah->sl & 0xf) << 2); 884 885 return 0; 886} 887 888static int __mlx4_ib_modify_qp(struct ib_qp *ibqp, 889 const struct ib_qp_attr *attr, int attr_mask, 890 enum ib_qp_state cur_state, enum ib_qp_state new_state) 891{ 892 struct mlx4_ib_dev *dev = to_mdev(ibqp->device); 893 struct mlx4_ib_qp *qp = to_mqp(ibqp); 894 struct mlx4_qp_context *context; 895 enum mlx4_qp_optpar optpar = 0; 896 int sqd_event; 897 int err = -EINVAL; 898 899 context = kzalloc(sizeof *context, GFP_KERNEL); 900 if (!context) 901 return -ENOMEM; 902 903 context->flags = cpu_to_be32((to_mlx4_state(new_state) << 28) | 904 (to_mlx4_st(ibqp->qp_type) << 16)); 905 906 if (!(attr_mask & IB_QP_PATH_MIG_STATE)) 907 context->flags |= cpu_to_be32(MLX4_QP_PM_MIGRATED << 11); 908 else { 909 optpar |= MLX4_QP_OPTPAR_PM_STATE; 910 switch (attr->path_mig_state) { 911 case IB_MIG_MIGRATED: 912 context->flags |= cpu_to_be32(MLX4_QP_PM_MIGRATED << 11); 913 break; 914 case IB_MIG_REARM: 915 context->flags |= cpu_to_be32(MLX4_QP_PM_REARM << 11); 916 break; 917 case IB_MIG_ARMED: 918 context->flags |= cpu_to_be32(MLX4_QP_PM_ARMED << 11); 919 break; 920 } 921 } 922 923 if (ibqp->qp_type == IB_QPT_GSI || ibqp->qp_type == IB_QPT_SMI) 924 context->mtu_msgmax = (IB_MTU_4096 << 5) | 11; 925 else if (ibqp->qp_type == IB_QPT_UD) { 926 if (qp->flags & MLX4_IB_QP_LSO) 927 context->mtu_msgmax = (IB_MTU_4096 << 5) | 928 ilog2(dev->dev->caps.max_gso_sz); 929 else 930 context->mtu_msgmax = (IB_MTU_4096 << 5) | 12; 931 } else if (attr_mask & IB_QP_PATH_MTU) { 932 if (attr->path_mtu < IB_MTU_256 || attr->path_mtu > IB_MTU_4096) { 933 printk(KERN_ERR "path MTU (%u) is invalid\n", 934 attr->path_mtu); 935 goto out; 936 } 937 context->mtu_msgmax = (attr->path_mtu << 5) | 938 ilog2(dev->dev->caps.max_msg_sz); 939 } 940 941 if (qp->rq.wqe_cnt) 942 context->rq_size_stride = ilog2(qp->rq.wqe_cnt) << 3; 943 context->rq_size_stride |= qp->rq.wqe_shift - 4; 944 945 if (qp->sq.wqe_cnt) 946 context->sq_size_stride = ilog2(qp->sq.wqe_cnt) << 3; 947 context->sq_size_stride |= qp->sq.wqe_shift - 4; 948 949 if (cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT) 950 context->sq_size_stride |= !!qp->sq_no_prefetch << 7; 951 952 if (qp->ibqp.uobject) 953 context->usr_page = cpu_to_be32(to_mucontext(ibqp->uobject->context)->uar.index); 954 else 955 context->usr_page = cpu_to_be32(dev->priv_uar.index); 956 957 if (attr_mask & IB_QP_DEST_QPN) 958 context->remote_qpn = cpu_to_be32(attr->dest_qp_num); 959 960 if (attr_mask & IB_QP_PORT) { 961 if (cur_state == IB_QPS_SQD && new_state == IB_QPS_SQD && 962 !(attr_mask & IB_QP_AV)) { 963 mlx4_set_sched(&context->pri_path, attr->port_num); 964 optpar |= MLX4_QP_OPTPAR_SCHED_QUEUE; 965 } 966 } 967 968 if (attr_mask & IB_QP_PKEY_INDEX) { 969 context->pri_path.pkey_index = attr->pkey_index; 970 optpar |= MLX4_QP_OPTPAR_PKEY_INDEX; 971 } 972 973 if (attr_mask & IB_QP_AV) { 974 if (mlx4_set_path(dev, &attr->ah_attr, &context->pri_path, 975 attr_mask & IB_QP_PORT ? attr->port_num : qp->port)) 976 goto out; 977 978 optpar |= (MLX4_QP_OPTPAR_PRIMARY_ADDR_PATH | 979 MLX4_QP_OPTPAR_SCHED_QUEUE); 980 } 981 982 if (attr_mask & IB_QP_TIMEOUT) { 983 context->pri_path.ackto = attr->timeout << 3; 984 optpar |= MLX4_QP_OPTPAR_ACK_TIMEOUT; 985 } 986 987 if (attr_mask & IB_QP_ALT_PATH) { 988 if (attr->alt_port_num == 0 || 989 attr->alt_port_num > dev->dev->caps.num_ports) 990 goto out; 991 992 if (attr->alt_pkey_index >= 993 dev->dev->caps.pkey_table_len[attr->alt_port_num]) 994 goto out; 995 996 if (mlx4_set_path(dev, &attr->alt_ah_attr, &context->alt_path, 997 attr->alt_port_num)) 998 goto out; 999 1000 context->alt_path.pkey_index = attr->alt_pkey_index; 1001 context->alt_path.ackto = attr->alt_timeout << 3; 1002 optpar |= MLX4_QP_OPTPAR_ALT_ADDR_PATH; 1003 } 1004 1005 context->pd = cpu_to_be32(to_mpd(ibqp->pd)->pdn); 1006 context->params1 = cpu_to_be32(MLX4_IB_ACK_REQ_FREQ << 28); 1007 1008 /* Set "fast registration enabled" for all kernel QPs */ 1009 if (!qp->ibqp.uobject) 1010 context->params1 |= cpu_to_be32(1 << 11); 1011 1012 if (attr_mask & IB_QP_RNR_RETRY) { 1013 context->params1 |= cpu_to_be32(attr->rnr_retry << 13); 1014 optpar |= MLX4_QP_OPTPAR_RNR_RETRY; 1015 } 1016 1017 if (attr_mask & IB_QP_RETRY_CNT) { 1018 context->params1 |= cpu_to_be32(attr->retry_cnt << 16); 1019 optpar |= MLX4_QP_OPTPAR_RETRY_COUNT; 1020 } 1021 1022 if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC) { 1023 if (attr->max_rd_atomic) 1024 context->params1 |= 1025 cpu_to_be32(fls(attr->max_rd_atomic - 1) << 21); 1026 optpar |= MLX4_QP_OPTPAR_SRA_MAX; 1027 } 1028 1029 if (attr_mask & IB_QP_SQ_PSN) 1030 context->next_send_psn = cpu_to_be32(attr->sq_psn); 1031 1032 context->cqn_send = cpu_to_be32(to_mcq(ibqp->send_cq)->mcq.cqn); 1033 1034 if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC) { 1035 if (attr->max_dest_rd_atomic) 1036 context->params2 |= 1037 cpu_to_be32(fls(attr->max_dest_rd_atomic - 1) << 21); 1038 optpar |= MLX4_QP_OPTPAR_RRA_MAX; 1039 } 1040 1041 if (attr_mask & (IB_QP_ACCESS_FLAGS | IB_QP_MAX_DEST_RD_ATOMIC)) { 1042 context->params2 |= to_mlx4_access_flags(qp, attr, attr_mask); 1043 optpar |= MLX4_QP_OPTPAR_RWE | MLX4_QP_OPTPAR_RRE | MLX4_QP_OPTPAR_RAE; 1044 } 1045 1046 if (ibqp->srq) 1047 context->params2 |= cpu_to_be32(MLX4_QP_BIT_RIC); 1048 1049 if (attr_mask & IB_QP_MIN_RNR_TIMER) { 1050 context->rnr_nextrecvpsn |= cpu_to_be32(attr->min_rnr_timer << 24); 1051 optpar |= MLX4_QP_OPTPAR_RNR_TIMEOUT; 1052 } 1053 if (attr_mask & IB_QP_RQ_PSN) 1054 context->rnr_nextrecvpsn |= cpu_to_be32(attr->rq_psn); 1055 1056 context->cqn_recv = cpu_to_be32(to_mcq(ibqp->recv_cq)->mcq.cqn); 1057 1058 if (attr_mask & IB_QP_QKEY) { 1059 context->qkey = cpu_to_be32(attr->qkey); 1060 optpar |= MLX4_QP_OPTPAR_Q_KEY; 1061 } 1062 1063 if (ibqp->srq) 1064 context->srqn = cpu_to_be32(1 << 24 | to_msrq(ibqp->srq)->msrq.srqn); 1065 1066 if (!ibqp->srq && cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT) 1067 context->db_rec_addr = cpu_to_be64(qp->db.dma); 1068 1069 if (cur_state == IB_QPS_INIT && 1070 new_state == IB_QPS_RTR && 1071 (ibqp->qp_type == IB_QPT_GSI || ibqp->qp_type == IB_QPT_SMI || 1072 ibqp->qp_type == IB_QPT_UD)) { 1073 context->pri_path.sched_queue = (qp->port - 1) << 6; 1074 if (is_qp0(dev, qp)) 1075 context->pri_path.sched_queue |= MLX4_IB_DEFAULT_QP0_SCHED_QUEUE; 1076 else 1077 context->pri_path.sched_queue |= MLX4_IB_DEFAULT_SCHED_QUEUE; 1078 } 1079 1080 if (cur_state == IB_QPS_RTS && new_state == IB_QPS_SQD && 1081 attr_mask & IB_QP_EN_SQD_ASYNC_NOTIFY && attr->en_sqd_async_notify) 1082 sqd_event = 1; 1083 else 1084 sqd_event = 0; 1085 1086 if (!ibqp->uobject && cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT) 1087 context->rlkey |= (1 << 4); 1088 1089 /* 1090 * Before passing a kernel QP to the HW, make sure that the 1091 * ownership bits of the send queue are set and the SQ 1092 * headroom is stamped so that the hardware doesn't start 1093 * processing stale work requests. 1094 */ 1095 if (!ibqp->uobject && cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT) { 1096 struct mlx4_wqe_ctrl_seg *ctrl; 1097 int i; 1098 1099 for (i = 0; i < qp->sq.wqe_cnt; ++i) { 1100 ctrl = get_send_wqe(qp, i); 1101 ctrl->owner_opcode = cpu_to_be32(1 << 31); 1102 if (qp->sq_max_wqes_per_wr == 1) 1103 ctrl->fence_size = 1 << (qp->sq.wqe_shift - 4); 1104 1105 stamp_send_wqe(qp, i, 1 << qp->sq.wqe_shift); 1106 } 1107 } 1108 1109 err = mlx4_qp_modify(dev->dev, &qp->mtt, to_mlx4_state(cur_state), 1110 to_mlx4_state(new_state), context, optpar, 1111 sqd_event, &qp->mqp); 1112 if (err) 1113 goto out; 1114 1115 qp->state = new_state; 1116 1117 if (attr_mask & IB_QP_ACCESS_FLAGS) 1118 qp->atomic_rd_en = attr->qp_access_flags; 1119 if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC) 1120 qp->resp_depth = attr->max_dest_rd_atomic; 1121 if (attr_mask & IB_QP_PORT) 1122 qp->port = attr->port_num; 1123 if (attr_mask & IB_QP_ALT_PATH) 1124 qp->alt_port = attr->alt_port_num; 1125 1126 if (is_sqp(dev, qp)) 1127 store_sqp_attrs(to_msqp(qp), attr, attr_mask); 1128 1129 /* 1130 * If we moved QP0 to RTR, bring the IB link up; if we moved 1131 * QP0 to RESET or ERROR, bring the link back down. 1132 */ 1133 if (is_qp0(dev, qp)) { 1134 if (cur_state != IB_QPS_RTR && new_state == IB_QPS_RTR) 1135 if (mlx4_INIT_PORT(dev->dev, qp->port)) 1136 printk(KERN_WARNING "INIT_PORT failed for port %d\n", 1137 qp->port); 1138 1139 if (cur_state != IB_QPS_RESET && cur_state != IB_QPS_ERR && 1140 (new_state == IB_QPS_RESET || new_state == IB_QPS_ERR)) 1141 mlx4_CLOSE_PORT(dev->dev, qp->port); 1142 } 1143 1144 /* 1145 * If we moved a kernel QP to RESET, clean up all old CQ 1146 * entries and reinitialize the QP. 1147 */ 1148 if (new_state == IB_QPS_RESET && !ibqp->uobject) { 1149 mlx4_ib_cq_clean(to_mcq(ibqp->recv_cq), qp->mqp.qpn, 1150 ibqp->srq ? to_msrq(ibqp->srq): NULL); 1151 if (ibqp->send_cq != ibqp->recv_cq) 1152 mlx4_ib_cq_clean(to_mcq(ibqp->send_cq), qp->mqp.qpn, NULL); 1153 1154 qp->rq.head = 0; 1155 qp->rq.tail = 0; 1156 qp->sq.head = 0; 1157 qp->sq.tail = 0; 1158 qp->sq_next_wqe = 0; 1159 if (!ibqp->srq) 1160 *qp->db.db = 0; 1161 } 1162 1163out: 1164 kfree(context); 1165 return err; 1166} 1167 1168int mlx4_ib_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr, 1169 int attr_mask, struct ib_udata *udata) 1170{ 1171 struct mlx4_ib_dev *dev = to_mdev(ibqp->device); 1172 struct mlx4_ib_qp *qp = to_mqp(ibqp); 1173 enum ib_qp_state cur_state, new_state; 1174 int err = -EINVAL; 1175 1176 mutex_lock(&qp->mutex); 1177 1178 cur_state = attr_mask & IB_QP_CUR_STATE ? attr->cur_qp_state : qp->state; 1179 new_state = attr_mask & IB_QP_STATE ? attr->qp_state : cur_state; 1180 1181 if (!ib_modify_qp_is_ok(cur_state, new_state, ibqp->qp_type, attr_mask)) 1182 goto out; 1183 1184 if ((attr_mask & IB_QP_PORT) && 1185 (attr->port_num == 0 || attr->port_num > dev->dev->caps.num_ports)) { 1186 goto out; 1187 } 1188 1189 if (attr_mask & IB_QP_PKEY_INDEX) { 1190 int p = attr_mask & IB_QP_PORT ? attr->port_num : qp->port; 1191 if (attr->pkey_index >= dev->dev->caps.pkey_table_len[p]) 1192 goto out; 1193 } 1194 1195 if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC && 1196 attr->max_rd_atomic > dev->dev->caps.max_qp_init_rdma) { 1197 goto out; 1198 } 1199 1200 if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC && 1201 attr->max_dest_rd_atomic > dev->dev->caps.max_qp_dest_rdma) { 1202 goto out; 1203 } 1204 1205 if (cur_state == new_state && cur_state == IB_QPS_RESET) { 1206 err = 0; 1207 goto out; 1208 } 1209 1210 err = __mlx4_ib_modify_qp(ibqp, attr, attr_mask, cur_state, new_state); 1211 1212out: 1213 mutex_unlock(&qp->mutex); 1214 return err; 1215} 1216 1217static int build_mlx_header(struct mlx4_ib_sqp *sqp, struct ib_send_wr *wr, 1218 void *wqe, unsigned *mlx_seg_len) 1219{ 1220 struct ib_device *ib_dev = sqp->qp.ibqp.device; 1221 struct mlx4_wqe_mlx_seg *mlx = wqe; 1222 struct mlx4_wqe_inline_seg *inl = wqe + sizeof *mlx; 1223 struct mlx4_ib_ah *ah = to_mah(wr->wr.ud.ah); 1224 u16 pkey; 1225 int send_size; 1226 int header_size; 1227 int spc; 1228 int i; 1229 1230 send_size = 0; 1231 for (i = 0; i < wr->num_sge; ++i) 1232 send_size += wr->sg_list[i].length; 1233 1234 ib_ud_header_init(send_size, mlx4_ib_ah_grh_present(ah), 0, &sqp->ud_header); 1235 1236 sqp->ud_header.lrh.service_level = 1237 be32_to_cpu(ah->av.sl_tclass_flowlabel) >> 28; 1238 sqp->ud_header.lrh.destination_lid = ah->av.dlid; 1239 sqp->ud_header.lrh.source_lid = cpu_to_be16(ah->av.g_slid & 0x7f); 1240 if (mlx4_ib_ah_grh_present(ah)) { 1241 sqp->ud_header.grh.traffic_class = 1242 (be32_to_cpu(ah->av.sl_tclass_flowlabel) >> 20) & 0xff; 1243 sqp->ud_header.grh.flow_label = 1244 ah->av.sl_tclass_flowlabel & cpu_to_be32(0xfffff); 1245 sqp->ud_header.grh.hop_limit = ah->av.hop_limit; 1246 ib_get_cached_gid(ib_dev, be32_to_cpu(ah->av.port_pd) >> 24, 1247 ah->av.gid_index, &sqp->ud_header.grh.source_gid); 1248 memcpy(sqp->ud_header.grh.destination_gid.raw, 1249 ah->av.dgid, 16); 1250 } 1251 1252 mlx->flags &= cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE); 1253 mlx->flags |= cpu_to_be32((!sqp->qp.ibqp.qp_num ? MLX4_WQE_MLX_VL15 : 0) | 1254 (sqp->ud_header.lrh.destination_lid == 1255 IB_LID_PERMISSIVE ? MLX4_WQE_MLX_SLR : 0) | 1256 (sqp->ud_header.lrh.service_level << 8)); 1257 mlx->rlid = sqp->ud_header.lrh.destination_lid; 1258 1259 switch (wr->opcode) { 1260 case IB_WR_SEND: 1261 sqp->ud_header.bth.opcode = IB_OPCODE_UD_SEND_ONLY; 1262 sqp->ud_header.immediate_present = 0; 1263 break; 1264 case IB_WR_SEND_WITH_IMM: 1265 sqp->ud_header.bth.opcode = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE; 1266 sqp->ud_header.immediate_present = 1; 1267 sqp->ud_header.immediate_data = wr->ex.imm_data; 1268 break; 1269 default: 1270 return -EINVAL; 1271 } 1272 1273 sqp->ud_header.lrh.virtual_lane = !sqp->qp.ibqp.qp_num ? 15 : 0; 1274 if (sqp->ud_header.lrh.destination_lid == IB_LID_PERMISSIVE) 1275 sqp->ud_header.lrh.source_lid = IB_LID_PERMISSIVE; 1276 sqp->ud_header.bth.solicited_event = !!(wr->send_flags & IB_SEND_SOLICITED); 1277 if (!sqp->qp.ibqp.qp_num) 1278 ib_get_cached_pkey(ib_dev, sqp->qp.port, sqp->pkey_index, &pkey); 1279 else 1280 ib_get_cached_pkey(ib_dev, sqp->qp.port, wr->wr.ud.pkey_index, &pkey); 1281 sqp->ud_header.bth.pkey = cpu_to_be16(pkey); 1282 sqp->ud_header.bth.destination_qpn = cpu_to_be32(wr->wr.ud.remote_qpn); 1283 sqp->ud_header.bth.psn = cpu_to_be32((sqp->send_psn++) & ((1 << 24) - 1)); 1284 sqp->ud_header.deth.qkey = cpu_to_be32(wr->wr.ud.remote_qkey & 0x80000000 ? 1285 sqp->qkey : wr->wr.ud.remote_qkey); 1286 sqp->ud_header.deth.source_qpn = cpu_to_be32(sqp->qp.ibqp.qp_num); 1287 1288 header_size = ib_ud_header_pack(&sqp->ud_header, sqp->header_buf); 1289 1290 if (0) { 1291 printk(KERN_ERR "built UD header of size %d:\n", header_size); 1292 for (i = 0; i < header_size / 4; ++i) { 1293 if (i % 8 == 0) 1294 printk(" [%02x] ", i * 4); 1295 printk(" %08x", 1296 be32_to_cpu(((__be32 *) sqp->header_buf)[i])); 1297 if ((i + 1) % 8 == 0) 1298 printk("\n"); 1299 } 1300 printk("\n"); 1301 } 1302 1303 /* 1304 * Inline data segments may not cross a 64 byte boundary. If 1305 * our UD header is bigger than the space available up to the 1306 * next 64 byte boundary in the WQE, use two inline data 1307 * segments to hold the UD header. 1308 */ 1309 spc = MLX4_INLINE_ALIGN - 1310 ((unsigned long) (inl + 1) & (MLX4_INLINE_ALIGN - 1)); 1311 if (header_size <= spc) { 1312 inl->byte_count = cpu_to_be32(1 << 31 | header_size); 1313 memcpy(inl + 1, sqp->header_buf, header_size); 1314 i = 1; 1315 } else { 1316 inl->byte_count = cpu_to_be32(1 << 31 | spc); 1317 memcpy(inl + 1, sqp->header_buf, spc); 1318 1319 inl = (void *) (inl + 1) + spc; 1320 memcpy(inl + 1, sqp->header_buf + spc, header_size - spc); 1321 /* 1322 * Need a barrier here to make sure all the data is 1323 * visible before the byte_count field is set. 1324 * Otherwise the HCA prefetcher could grab the 64-byte 1325 * chunk with this inline segment and get a valid (!= 1326 * 0xffffffff) byte count but stale data, and end up 1327 * generating a packet with bad headers. 1328 * 1329 * The first inline segment's byte_count field doesn't 1330 * need a barrier, because it comes after a 1331 * control/MLX segment and therefore is at an offset 1332 * of 16 mod 64. 1333 */ 1334 wmb(); 1335 inl->byte_count = cpu_to_be32(1 << 31 | (header_size - spc)); 1336 i = 2; 1337 } 1338 1339 *mlx_seg_len = 1340 ALIGN(i * sizeof (struct mlx4_wqe_inline_seg) + header_size, 16); 1341 return 0; 1342} 1343 1344static int mlx4_wq_overflow(struct mlx4_ib_wq *wq, int nreq, struct ib_cq *ib_cq) 1345{ 1346 unsigned cur; 1347 struct mlx4_ib_cq *cq; 1348 1349 cur = wq->head - wq->tail; 1350 if (likely(cur + nreq < wq->max_post)) 1351 return 0; 1352 1353 cq = to_mcq(ib_cq); 1354 spin_lock(&cq->lock); 1355 cur = wq->head - wq->tail; 1356 spin_unlock(&cq->lock); 1357 1358 return cur + nreq >= wq->max_post; 1359} 1360 1361static __be32 convert_access(int acc) 1362{ 1363 return (acc & IB_ACCESS_REMOTE_ATOMIC ? cpu_to_be32(MLX4_WQE_FMR_PERM_ATOMIC) : 0) | 1364 (acc & IB_ACCESS_REMOTE_WRITE ? cpu_to_be32(MLX4_WQE_FMR_PERM_REMOTE_WRITE) : 0) | 1365 (acc & IB_ACCESS_REMOTE_READ ? cpu_to_be32(MLX4_WQE_FMR_PERM_REMOTE_READ) : 0) | 1366 (acc & IB_ACCESS_LOCAL_WRITE ? cpu_to_be32(MLX4_WQE_FMR_PERM_LOCAL_WRITE) : 0) | 1367 cpu_to_be32(MLX4_WQE_FMR_PERM_LOCAL_READ); 1368} 1369 1370static void set_fmr_seg(struct mlx4_wqe_fmr_seg *fseg, struct ib_send_wr *wr) 1371{ 1372 struct mlx4_ib_fast_reg_page_list *mfrpl = to_mfrpl(wr->wr.fast_reg.page_list); 1373 int i; 1374 1375 for (i = 0; i < wr->wr.fast_reg.page_list_len; ++i) 1376 mfrpl->mapped_page_list[i] = 1377 cpu_to_be64(wr->wr.fast_reg.page_list->page_list[i] | 1378 MLX4_MTT_FLAG_PRESENT); 1379 1380 fseg->flags = convert_access(wr->wr.fast_reg.access_flags); 1381 fseg->mem_key = cpu_to_be32(wr->wr.fast_reg.rkey); 1382 fseg->buf_list = cpu_to_be64(mfrpl->map); 1383 fseg->start_addr = cpu_to_be64(wr->wr.fast_reg.iova_start); 1384 fseg->reg_len = cpu_to_be64(wr->wr.fast_reg.length); 1385 fseg->offset = 0; 1386 fseg->page_size = cpu_to_be32(wr->wr.fast_reg.page_shift); 1387 fseg->reserved[0] = 0; 1388 fseg->reserved[1] = 0; 1389} 1390 1391static void set_local_inv_seg(struct mlx4_wqe_local_inval_seg *iseg, u32 rkey) 1392{ 1393 iseg->flags = 0; 1394 iseg->mem_key = cpu_to_be32(rkey); 1395 iseg->guest_id = 0; 1396 iseg->pa = 0; 1397} 1398 1399static __always_inline void set_raddr_seg(struct mlx4_wqe_raddr_seg *rseg, 1400 u64 remote_addr, u32 rkey) 1401{ 1402 rseg->raddr = cpu_to_be64(remote_addr); 1403 rseg->rkey = cpu_to_be32(rkey); 1404 rseg->reserved = 0; 1405} 1406 1407static void set_atomic_seg(struct mlx4_wqe_atomic_seg *aseg, struct ib_send_wr *wr) 1408{ 1409 if (wr->opcode == IB_WR_ATOMIC_CMP_AND_SWP) { 1410 aseg->swap_add = cpu_to_be64(wr->wr.atomic.swap); 1411 aseg->compare = cpu_to_be64(wr->wr.atomic.compare_add); 1412 } else if (wr->opcode == IB_WR_MASKED_ATOMIC_FETCH_AND_ADD) { 1413 aseg->swap_add = cpu_to_be64(wr->wr.atomic.compare_add); 1414 aseg->compare = cpu_to_be64(wr->wr.atomic.compare_add_mask); 1415 } else { 1416 aseg->swap_add = cpu_to_be64(wr->wr.atomic.compare_add); 1417 aseg->compare = 0; 1418 } 1419 1420} 1421 1422static void set_masked_atomic_seg(struct mlx4_wqe_masked_atomic_seg *aseg, 1423 struct ib_send_wr *wr) 1424{ 1425 aseg->swap_add = cpu_to_be64(wr->wr.atomic.swap); 1426 aseg->swap_add_mask = cpu_to_be64(wr->wr.atomic.swap_mask); 1427 aseg->compare = cpu_to_be64(wr->wr.atomic.compare_add); 1428 aseg->compare_mask = cpu_to_be64(wr->wr.atomic.compare_add_mask); 1429} 1430 1431static void set_datagram_seg(struct mlx4_wqe_datagram_seg *dseg, 1432 struct ib_send_wr *wr) 1433{ 1434 memcpy(dseg->av, &to_mah(wr->wr.ud.ah)->av, sizeof (struct mlx4_av)); 1435 dseg->dqpn = cpu_to_be32(wr->wr.ud.remote_qpn); 1436 dseg->qkey = cpu_to_be32(wr->wr.ud.remote_qkey); 1437} 1438 1439static void set_mlx_icrc_seg(void *dseg) 1440{ 1441 u32 *t = dseg; 1442 struct mlx4_wqe_inline_seg *iseg = dseg; 1443 1444 t[1] = 0; 1445 1446 /* 1447 * Need a barrier here before writing the byte_count field to 1448 * make sure that all the data is visible before the 1449 * byte_count field is set. Otherwise, if the segment begins 1450 * a new cacheline, the HCA prefetcher could grab the 64-byte 1451 * chunk and get a valid (!= * 0xffffffff) byte count but 1452 * stale data, and end up sending the wrong data. 1453 */ 1454 wmb(); 1455 1456 iseg->byte_count = cpu_to_be32((1 << 31) | 4); 1457} 1458 1459static void set_data_seg(struct mlx4_wqe_data_seg *dseg, struct ib_sge *sg) 1460{ 1461 dseg->lkey = cpu_to_be32(sg->lkey); 1462 dseg->addr = cpu_to_be64(sg->addr); 1463 1464 /* 1465 * Need a barrier here before writing the byte_count field to 1466 * make sure that all the data is visible before the 1467 * byte_count field is set. Otherwise, if the segment begins 1468 * a new cacheline, the HCA prefetcher could grab the 64-byte 1469 * chunk and get a valid (!= * 0xffffffff) byte count but 1470 * stale data, and end up sending the wrong data. 1471 */ 1472 wmb(); 1473 1474 dseg->byte_count = cpu_to_be32(sg->length); 1475} 1476 1477static void __set_data_seg(struct mlx4_wqe_data_seg *dseg, struct ib_sge *sg) 1478{ 1479 dseg->byte_count = cpu_to_be32(sg->length); 1480 dseg->lkey = cpu_to_be32(sg->lkey); 1481 dseg->addr = cpu_to_be64(sg->addr); 1482} 1483 1484static int build_lso_seg(struct mlx4_wqe_lso_seg *wqe, struct ib_send_wr *wr, 1485 struct mlx4_ib_qp *qp, unsigned *lso_seg_len, 1486 __be32 *lso_hdr_sz, __be32 *blh) 1487{ 1488 unsigned halign = ALIGN(sizeof *wqe + wr->wr.ud.hlen, 16); 1489 1490 if (unlikely(halign > MLX4_IB_CACHE_LINE_SIZE)) 1491 *blh = cpu_to_be32(1 << 6); 1492 1493 if (unlikely(!(qp->flags & MLX4_IB_QP_LSO) && 1494 wr->num_sge > qp->sq.max_gs - (halign >> 4))) 1495 return -EINVAL; 1496 1497 memcpy(wqe->header, wr->wr.ud.header, wr->wr.ud.hlen); 1498 1499 *lso_hdr_sz = cpu_to_be32((wr->wr.ud.mss - wr->wr.ud.hlen) << 16 | 1500 wr->wr.ud.hlen); 1501 *lso_seg_len = halign; 1502 return 0; 1503} 1504 1505static __be32 send_ieth(struct ib_send_wr *wr) 1506{ 1507 switch (wr->opcode) { 1508 case IB_WR_SEND_WITH_IMM: 1509 case IB_WR_RDMA_WRITE_WITH_IMM: 1510 return wr->ex.imm_data; 1511 1512 case IB_WR_SEND_WITH_INV: 1513 return cpu_to_be32(wr->ex.invalidate_rkey); 1514 1515 default: 1516 return 0; 1517 } 1518} 1519 1520int mlx4_ib_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr, 1521 struct ib_send_wr **bad_wr) 1522{ 1523 struct mlx4_ib_qp *qp = to_mqp(ibqp); 1524 void *wqe; 1525 struct mlx4_wqe_ctrl_seg *ctrl; 1526 struct mlx4_wqe_data_seg *dseg; 1527 unsigned long flags; 1528 int nreq; 1529 int err = 0; 1530 unsigned ind; 1531 int uninitialized_var(stamp); 1532 int uninitialized_var(size); 1533 unsigned uninitialized_var(seglen); 1534 __be32 dummy; 1535 __be32 *lso_wqe; 1536 __be32 uninitialized_var(lso_hdr_sz); 1537 __be32 blh; 1538 int i; 1539 1540 spin_lock_irqsave(&qp->sq.lock, flags); 1541 1542 ind = qp->sq_next_wqe; 1543 1544 for (nreq = 0; wr; ++nreq, wr = wr->next) { 1545 lso_wqe = &dummy; 1546 blh = 0; 1547 1548 if (mlx4_wq_overflow(&qp->sq, nreq, qp->ibqp.send_cq)) { 1549 err = -ENOMEM; 1550 *bad_wr = wr; 1551 goto out; 1552 } 1553 1554 if (unlikely(wr->num_sge > qp->sq.max_gs)) { 1555 err = -EINVAL; 1556 *bad_wr = wr; 1557 goto out; 1558 } 1559 1560 ctrl = wqe = get_send_wqe(qp, ind & (qp->sq.wqe_cnt - 1)); 1561 qp->sq.wrid[(qp->sq.head + nreq) & (qp->sq.wqe_cnt - 1)] = wr->wr_id; 1562 1563 ctrl->srcrb_flags = 1564 (wr->send_flags & IB_SEND_SIGNALED ? 1565 cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE) : 0) | 1566 (wr->send_flags & IB_SEND_SOLICITED ? 1567 cpu_to_be32(MLX4_WQE_CTRL_SOLICITED) : 0) | 1568 ((wr->send_flags & IB_SEND_IP_CSUM) ? 1569 cpu_to_be32(MLX4_WQE_CTRL_IP_CSUM | 1570 MLX4_WQE_CTRL_TCP_UDP_CSUM) : 0) | 1571 qp->sq_signal_bits; 1572 1573 ctrl->imm = send_ieth(wr); 1574 1575 wqe += sizeof *ctrl; 1576 size = sizeof *ctrl / 16; 1577 1578 switch (ibqp->qp_type) { 1579 case IB_QPT_RC: 1580 case IB_QPT_UC: 1581 switch (wr->opcode) { 1582 case IB_WR_ATOMIC_CMP_AND_SWP: 1583 case IB_WR_ATOMIC_FETCH_AND_ADD: 1584 case IB_WR_MASKED_ATOMIC_FETCH_AND_ADD: 1585 set_raddr_seg(wqe, wr->wr.atomic.remote_addr, 1586 wr->wr.atomic.rkey); 1587 wqe += sizeof (struct mlx4_wqe_raddr_seg); 1588 1589 set_atomic_seg(wqe, wr); 1590 wqe += sizeof (struct mlx4_wqe_atomic_seg); 1591 1592 size += (sizeof (struct mlx4_wqe_raddr_seg) + 1593 sizeof (struct mlx4_wqe_atomic_seg)) / 16; 1594 1595 break; 1596 1597 case IB_WR_MASKED_ATOMIC_CMP_AND_SWP: 1598 set_raddr_seg(wqe, wr->wr.atomic.remote_addr, 1599 wr->wr.atomic.rkey); 1600 wqe += sizeof (struct mlx4_wqe_raddr_seg); 1601 1602 set_masked_atomic_seg(wqe, wr); 1603 wqe += sizeof (struct mlx4_wqe_masked_atomic_seg); 1604 1605 size += (sizeof (struct mlx4_wqe_raddr_seg) + 1606 sizeof (struct mlx4_wqe_masked_atomic_seg)) / 16; 1607 1608 break; 1609 1610 case IB_WR_RDMA_READ: 1611 case IB_WR_RDMA_WRITE: 1612 case IB_WR_RDMA_WRITE_WITH_IMM: 1613 set_raddr_seg(wqe, wr->wr.rdma.remote_addr, 1614 wr->wr.rdma.rkey); 1615 wqe += sizeof (struct mlx4_wqe_raddr_seg); 1616 size += sizeof (struct mlx4_wqe_raddr_seg) / 16; 1617 break; 1618 1619 case IB_WR_LOCAL_INV: 1620 ctrl->srcrb_flags |= 1621 cpu_to_be32(MLX4_WQE_CTRL_STRONG_ORDER); 1622 set_local_inv_seg(wqe, wr->ex.invalidate_rkey); 1623 wqe += sizeof (struct mlx4_wqe_local_inval_seg); 1624 size += sizeof (struct mlx4_wqe_local_inval_seg) / 16; 1625 break; 1626 1627 case IB_WR_FAST_REG_MR: 1628 ctrl->srcrb_flags |= 1629 cpu_to_be32(MLX4_WQE_CTRL_STRONG_ORDER); 1630 set_fmr_seg(wqe, wr); 1631 wqe += sizeof (struct mlx4_wqe_fmr_seg); 1632 size += sizeof (struct mlx4_wqe_fmr_seg) / 16; 1633 break; 1634 1635 default: 1636 /* No extra segments required for sends */ 1637 break; 1638 } 1639 break; 1640 1641 case IB_QPT_UD: 1642 set_datagram_seg(wqe, wr); 1643 wqe += sizeof (struct mlx4_wqe_datagram_seg); 1644 size += sizeof (struct mlx4_wqe_datagram_seg) / 16; 1645 1646 if (wr->opcode == IB_WR_LSO) { 1647 err = build_lso_seg(wqe, wr, qp, &seglen, &lso_hdr_sz, &blh); 1648 if (unlikely(err)) { 1649 *bad_wr = wr; 1650 goto out; 1651 } 1652 lso_wqe = (__be32 *) wqe; 1653 wqe += seglen; 1654 size += seglen / 16; 1655 } 1656 break; 1657 1658 case IB_QPT_SMI: 1659 case IB_QPT_GSI: 1660 err = build_mlx_header(to_msqp(qp), wr, ctrl, &seglen); 1661 if (unlikely(err)) { 1662 *bad_wr = wr; 1663 goto out; 1664 } 1665 wqe += seglen; 1666 size += seglen / 16; 1667 break; 1668 1669 default: 1670 break; 1671 } 1672 1673 /* 1674 * Write data segments in reverse order, so as to 1675 * overwrite cacheline stamp last within each 1676 * cacheline. This avoids issues with WQE 1677 * prefetching. 1678 */ 1679 1680 dseg = wqe; 1681 dseg += wr->num_sge - 1; 1682 size += wr->num_sge * (sizeof (struct mlx4_wqe_data_seg) / 16); 1683 1684 /* Add one more inline data segment for ICRC for MLX sends */ 1685 if (unlikely(qp->ibqp.qp_type == IB_QPT_SMI || 1686 qp->ibqp.qp_type == IB_QPT_GSI)) { 1687 set_mlx_icrc_seg(dseg + 1); 1688 size += sizeof (struct mlx4_wqe_data_seg) / 16; 1689 } 1690 1691 for (i = wr->num_sge - 1; i >= 0; --i, --dseg) 1692 set_data_seg(dseg, wr->sg_list + i); 1693 1694 /* 1695 * Possibly overwrite stamping in cacheline with LSO 1696 * segment only after making sure all data segments 1697 * are written. 1698 */ 1699 wmb(); 1700 *lso_wqe = lso_hdr_sz; 1701 1702 ctrl->fence_size = (wr->send_flags & IB_SEND_FENCE ? 1703 MLX4_WQE_CTRL_FENCE : 0) | size; 1704 1705 /* 1706 * Make sure descriptor is fully written before 1707 * setting ownership bit (because HW can start 1708 * executing as soon as we do). 1709 */ 1710 wmb(); 1711 1712 if (wr->opcode < 0 || wr->opcode >= ARRAY_SIZE(mlx4_ib_opcode)) { 1713 err = -EINVAL; 1714 goto out; 1715 } 1716 1717 ctrl->owner_opcode = mlx4_ib_opcode[wr->opcode] | 1718 (ind & qp->sq.wqe_cnt ? cpu_to_be32(1 << 31) : 0) | blh; 1719 1720 stamp = ind + qp->sq_spare_wqes; 1721 ind += DIV_ROUND_UP(size * 16, 1U << qp->sq.wqe_shift); 1722 1723 /* 1724 * We can improve latency by not stamping the last 1725 * send queue WQE until after ringing the doorbell, so 1726 * only stamp here if there are still more WQEs to post. 1727 * 1728 * Same optimization applies to padding with NOP wqe 1729 * in case of WQE shrinking (used to prevent wrap-around 1730 * in the middle of WR). 1731 */ 1732 if (wr->next) { 1733 stamp_send_wqe(qp, stamp, size * 16); 1734 ind = pad_wraparound(qp, ind); 1735 } 1736 } 1737 1738out: 1739 if (likely(nreq)) { 1740 qp->sq.head += nreq; 1741 1742 /* 1743 * Make sure that descriptors are written before 1744 * doorbell record. 1745 */ 1746 wmb(); 1747 1748 writel(qp->doorbell_qpn, 1749 to_mdev(ibqp->device)->uar_map + MLX4_SEND_DOORBELL); 1750 1751 /* 1752 * Make sure doorbells don't leak out of SQ spinlock 1753 * and reach the HCA out of order. 1754 */ 1755 mmiowb(); 1756 1757 stamp_send_wqe(qp, stamp, size * 16); 1758 1759 ind = pad_wraparound(qp, ind); 1760 qp->sq_next_wqe = ind; 1761 } 1762 1763 spin_unlock_irqrestore(&qp->sq.lock, flags); 1764 1765 return err; 1766} 1767 1768int mlx4_ib_post_recv(struct ib_qp *ibqp, struct ib_recv_wr *wr, 1769 struct ib_recv_wr **bad_wr) 1770{ 1771 struct mlx4_ib_qp *qp = to_mqp(ibqp); 1772 struct mlx4_wqe_data_seg *scat; 1773 unsigned long flags; 1774 int err = 0; 1775 int nreq; 1776 int ind; 1777 int i; 1778 1779 spin_lock_irqsave(&qp->rq.lock, flags); 1780 1781 ind = qp->rq.head & (qp->rq.wqe_cnt - 1); 1782 1783 for (nreq = 0; wr; ++nreq, wr = wr->next) { 1784 if (mlx4_wq_overflow(&qp->rq, nreq, qp->ibqp.recv_cq)) { 1785 err = -ENOMEM; 1786 *bad_wr = wr; 1787 goto out; 1788 } 1789 1790 if (unlikely(wr->num_sge > qp->rq.max_gs)) { 1791 err = -EINVAL; 1792 *bad_wr = wr; 1793 goto out; 1794 } 1795 1796 scat = get_recv_wqe(qp, ind); 1797 1798 for (i = 0; i < wr->num_sge; ++i) 1799 __set_data_seg(scat + i, wr->sg_list + i); 1800 1801 if (i < qp->rq.max_gs) { 1802 scat[i].byte_count = 0; 1803 scat[i].lkey = cpu_to_be32(MLX4_INVALID_LKEY); 1804 scat[i].addr = 0; 1805 } 1806 1807 qp->rq.wrid[ind] = wr->wr_id; 1808 1809 ind = (ind + 1) & (qp->rq.wqe_cnt - 1); 1810 } 1811 1812out: 1813 if (likely(nreq)) { 1814 qp->rq.head += nreq; 1815 1816 /* 1817 * Make sure that descriptors are written before 1818 * doorbell record. 1819 */ 1820 wmb(); 1821 1822 *qp->db.db = cpu_to_be32(qp->rq.head & 0xffff); 1823 } 1824 1825 spin_unlock_irqrestore(&qp->rq.lock, flags); 1826 1827 return err; 1828} 1829 1830static inline enum ib_qp_state to_ib_qp_state(enum mlx4_qp_state mlx4_state) 1831{ 1832 switch (mlx4_state) { 1833 case MLX4_QP_STATE_RST: return IB_QPS_RESET; 1834 case MLX4_QP_STATE_INIT: return IB_QPS_INIT; 1835 case MLX4_QP_STATE_RTR: return IB_QPS_RTR; 1836 case MLX4_QP_STATE_RTS: return IB_QPS_RTS; 1837 case MLX4_QP_STATE_SQ_DRAINING: 1838 case MLX4_QP_STATE_SQD: return IB_QPS_SQD; 1839 case MLX4_QP_STATE_SQER: return IB_QPS_SQE; 1840 case MLX4_QP_STATE_ERR: return IB_QPS_ERR; 1841 default: return -1; 1842 } 1843} 1844 1845static inline enum ib_mig_state to_ib_mig_state(int mlx4_mig_state) 1846{ 1847 switch (mlx4_mig_state) { 1848 case MLX4_QP_PM_ARMED: return IB_MIG_ARMED; 1849 case MLX4_QP_PM_REARM: return IB_MIG_REARM; 1850 case MLX4_QP_PM_MIGRATED: return IB_MIG_MIGRATED; 1851 default: return -1; 1852 } 1853} 1854 1855static int to_ib_qp_access_flags(int mlx4_flags) 1856{ 1857 int ib_flags = 0; 1858 1859 if (mlx4_flags & MLX4_QP_BIT_RRE) 1860 ib_flags |= IB_ACCESS_REMOTE_READ; 1861 if (mlx4_flags & MLX4_QP_BIT_RWE) 1862 ib_flags |= IB_ACCESS_REMOTE_WRITE; 1863 if (mlx4_flags & MLX4_QP_BIT_RAE) 1864 ib_flags |= IB_ACCESS_REMOTE_ATOMIC; 1865 1866 return ib_flags; 1867} 1868 1869static void to_ib_ah_attr(struct mlx4_dev *dev, struct ib_ah_attr *ib_ah_attr, 1870 struct mlx4_qp_path *path) 1871{ 1872 memset(ib_ah_attr, 0, sizeof *ib_ah_attr); 1873 ib_ah_attr->port_num = path->sched_queue & 0x40 ? 2 : 1; 1874 1875 if (ib_ah_attr->port_num == 0 || ib_ah_attr->port_num > dev->caps.num_ports) 1876 return; 1877 1878 ib_ah_attr->dlid = be16_to_cpu(path->rlid); 1879 ib_ah_attr->sl = (path->sched_queue >> 2) & 0xf; 1880 ib_ah_attr->src_path_bits = path->grh_mylmc & 0x7f; 1881 ib_ah_attr->static_rate = path->static_rate ? path->static_rate - 5 : 0; 1882 ib_ah_attr->ah_flags = (path->grh_mylmc & (1 << 7)) ? IB_AH_GRH : 0; 1883 if (ib_ah_attr->ah_flags) { 1884 ib_ah_attr->grh.sgid_index = path->mgid_index; 1885 ib_ah_attr->grh.hop_limit = path->hop_limit; 1886 ib_ah_attr->grh.traffic_class = 1887 (be32_to_cpu(path->tclass_flowlabel) >> 20) & 0xff; 1888 ib_ah_attr->grh.flow_label = 1889 be32_to_cpu(path->tclass_flowlabel) & 0xfffff; 1890 memcpy(ib_ah_attr->grh.dgid.raw, 1891 path->rgid, sizeof ib_ah_attr->grh.dgid.raw); 1892 } 1893} 1894 1895int mlx4_ib_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *qp_attr, int qp_attr_mask, 1896 struct ib_qp_init_attr *qp_init_attr) 1897{ 1898 struct mlx4_ib_dev *dev = to_mdev(ibqp->device); 1899 struct mlx4_ib_qp *qp = to_mqp(ibqp); 1900 struct mlx4_qp_context context; 1901 int mlx4_state; 1902 int err = 0; 1903 1904 mutex_lock(&qp->mutex); 1905 1906 if (qp->state == IB_QPS_RESET) { 1907 qp_attr->qp_state = IB_QPS_RESET; 1908 goto done; 1909 } 1910 1911 err = mlx4_qp_query(dev->dev, &qp->mqp, &context); 1912 if (err) { 1913 err = -EINVAL; 1914 goto out; 1915 } 1916 1917 mlx4_state = be32_to_cpu(context.flags) >> 28; 1918 1919 qp->state = to_ib_qp_state(mlx4_state); 1920 qp_attr->qp_state = qp->state; 1921 qp_attr->path_mtu = context.mtu_msgmax >> 5; 1922 qp_attr->path_mig_state = 1923 to_ib_mig_state((be32_to_cpu(context.flags) >> 11) & 0x3); 1924 qp_attr->qkey = be32_to_cpu(context.qkey); 1925 qp_attr->rq_psn = be32_to_cpu(context.rnr_nextrecvpsn) & 0xffffff; 1926 qp_attr->sq_psn = be32_to_cpu(context.next_send_psn) & 0xffffff; 1927 qp_attr->dest_qp_num = be32_to_cpu(context.remote_qpn) & 0xffffff; 1928 qp_attr->qp_access_flags = 1929 to_ib_qp_access_flags(be32_to_cpu(context.params2)); 1930 1931 if (qp->ibqp.qp_type == IB_QPT_RC || qp->ibqp.qp_type == IB_QPT_UC) { 1932 to_ib_ah_attr(dev->dev, &qp_attr->ah_attr, &context.pri_path); 1933 to_ib_ah_attr(dev->dev, &qp_attr->alt_ah_attr, &context.alt_path); 1934 qp_attr->alt_pkey_index = context.alt_path.pkey_index & 0x7f; 1935 qp_attr->alt_port_num = qp_attr->alt_ah_attr.port_num; 1936 } 1937 1938 qp_attr->pkey_index = context.pri_path.pkey_index & 0x7f; 1939 if (qp_attr->qp_state == IB_QPS_INIT) 1940 qp_attr->port_num = qp->port; 1941 else 1942 qp_attr->port_num = context.pri_path.sched_queue & 0x40 ? 2 : 1; 1943 1944 /* qp_attr->en_sqd_async_notify is only applicable in modify qp */ 1945 qp_attr->sq_draining = mlx4_state == MLX4_QP_STATE_SQ_DRAINING; 1946 1947 qp_attr->max_rd_atomic = 1 << ((be32_to_cpu(context.params1) >> 21) & 0x7); 1948 1949 qp_attr->max_dest_rd_atomic = 1950 1 << ((be32_to_cpu(context.params2) >> 21) & 0x7); 1951 qp_attr->min_rnr_timer = 1952 (be32_to_cpu(context.rnr_nextrecvpsn) >> 24) & 0x1f; 1953 qp_attr->timeout = context.pri_path.ackto >> 3; 1954 qp_attr->retry_cnt = (be32_to_cpu(context.params1) >> 16) & 0x7; 1955 qp_attr->rnr_retry = (be32_to_cpu(context.params1) >> 13) & 0x7; 1956 qp_attr->alt_timeout = context.alt_path.ackto >> 3; 1957 1958done: 1959 qp_attr->cur_qp_state = qp_attr->qp_state; 1960 qp_attr->cap.max_recv_wr = qp->rq.wqe_cnt; 1961 qp_attr->cap.max_recv_sge = qp->rq.max_gs; 1962 1963 if (!ibqp->uobject) { 1964 qp_attr->cap.max_send_wr = qp->sq.wqe_cnt; 1965 qp_attr->cap.max_send_sge = qp->sq.max_gs; 1966 } else { 1967 qp_attr->cap.max_send_wr = 0; 1968 qp_attr->cap.max_send_sge = 0; 1969 } 1970 1971 /* 1972 * We don't support inline sends for kernel QPs (yet), and we 1973 * don't know what userspace's value should be. 1974 */ 1975 qp_attr->cap.max_inline_data = 0; 1976 1977 qp_init_attr->cap = qp_attr->cap; 1978 1979 qp_init_attr->create_flags = 0; 1980 if (qp->flags & MLX4_IB_QP_BLOCK_MULTICAST_LOOPBACK) 1981 qp_init_attr->create_flags |= IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK; 1982 1983 if (qp->flags & MLX4_IB_QP_LSO) 1984 qp_init_attr->create_flags |= IB_QP_CREATE_IPOIB_UD_LSO; 1985 1986out: 1987 mutex_unlock(&qp->mutex); 1988 return err; 1989} 1990