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 #include <linux/netdevice.h> 37 38 #include <rdma/ib_cache.h> 39 #include <rdma/ib_pack.h> 40 #include <rdma/ib_addr.h> 41 42 #include <linux/mlx4/qp.h> 43 44 #include "mlx4_ib.h" 45 #include "user.h" 46 47 enum { 48 MLX4_IB_ACK_REQ_FREQ = 8, 49 }; 50 51 enum { 52 MLX4_IB_DEFAULT_SCHED_QUEUE = 0x83, 53 MLX4_IB_DEFAULT_QP0_SCHED_QUEUE = 0x3f, 54 MLX4_IB_LINK_TYPE_IB = 0, 55 MLX4_IB_LINK_TYPE_ETH = 1 56 }; 57 58 enum { 59 /* 60 * Largest possible UD header: send with GRH and immediate 61 * data plus 18 bytes for an Ethernet header with VLAN/802.1Q 62 * tag. (LRH would only use 8 bytes, so Ethernet is the 63 * biggest case) 64 */ 65 MLX4_IB_UD_HEADER_SIZE = 82, 66 MLX4_IB_LSO_HEADER_SPARE = 128, 67 }; 68 69 enum { 70 MLX4_IB_IBOE_ETHERTYPE = 0x8915 71 }; 72 73 struct mlx4_ib_sqp { 74 struct mlx4_ib_qp qp; 75 int pkey_index; 76 u32 qkey; 77 u32 send_psn; 78 struct ib_ud_header ud_header; 79 u8 header_buf[MLX4_IB_UD_HEADER_SIZE]; 80 }; 81 82 enum { 83 MLX4_IB_MIN_SQ_STRIDE = 6, 84 MLX4_IB_CACHE_LINE_SIZE = 64, 85 }; 86 87 static const __be32 mlx4_ib_opcode[] = { 88 [IB_WR_SEND] = cpu_to_be32(MLX4_OPCODE_SEND), 89 [IB_WR_LSO] = cpu_to_be32(MLX4_OPCODE_LSO), 90 [IB_WR_SEND_WITH_IMM] = cpu_to_be32(MLX4_OPCODE_SEND_IMM), 91 [IB_WR_RDMA_WRITE] = cpu_to_be32(MLX4_OPCODE_RDMA_WRITE), 92 [IB_WR_RDMA_WRITE_WITH_IMM] = cpu_to_be32(MLX4_OPCODE_RDMA_WRITE_IMM), 93 [IB_WR_RDMA_READ] = cpu_to_be32(MLX4_OPCODE_RDMA_READ), 94 [IB_WR_ATOMIC_CMP_AND_SWP] = cpu_to_be32(MLX4_OPCODE_ATOMIC_CS), 95 [IB_WR_ATOMIC_FETCH_AND_ADD] = cpu_to_be32(MLX4_OPCODE_ATOMIC_FA), 96 [IB_WR_SEND_WITH_INV] = cpu_to_be32(MLX4_OPCODE_SEND_INVAL), 97 [IB_WR_LOCAL_INV] = cpu_to_be32(MLX4_OPCODE_LOCAL_INVAL), 98 [IB_WR_FAST_REG_MR] = cpu_to_be32(MLX4_OPCODE_FMR), 99 [IB_WR_MASKED_ATOMIC_CMP_AND_SWP] = cpu_to_be32(MLX4_OPCODE_MASKED_ATOMIC_CS), 100 [IB_WR_MASKED_ATOMIC_FETCH_AND_ADD] = cpu_to_be32(MLX4_OPCODE_MASKED_ATOMIC_FA), 101 }; 102 103 static struct mlx4_ib_sqp *to_msqp(struct mlx4_ib_qp *mqp) 104 { 105 return container_of(mqp, struct mlx4_ib_sqp, qp); 106 } 107 108 static int is_sqp(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp) 109 { 110 return qp->mqp.qpn >= dev->dev->caps.sqp_start && 111 qp->mqp.qpn <= dev->dev->caps.sqp_start + 3; 112 } 113 114 static int is_qp0(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp) 115 { 116 return qp->mqp.qpn >= dev->dev->caps.sqp_start && 117 qp->mqp.qpn <= dev->dev->caps.sqp_start + 1; 118 } 119 120 static void *get_wqe(struct mlx4_ib_qp *qp, int offset) 121 { 122 return mlx4_buf_offset(&qp->buf, offset); 123 } 124 125 static void *get_recv_wqe(struct mlx4_ib_qp *qp, int n) 126 { 127 return get_wqe(qp, qp->rq.offset + (n << qp->rq.wqe_shift)); 128 } 129 130 static void *get_send_wqe(struct mlx4_ib_qp *qp, int n) 131 { 132 return get_wqe(qp, qp->sq.offset + (n << qp->sq.wqe_shift)); 133 } 134 135 /* 136 * Stamp a SQ WQE so that it is invalid if prefetched by marking the 137 * first four bytes of every 64 byte chunk with 138 * 0x7FFFFFF | (invalid_ownership_value << 31). 139 * 140 * When the max work request size is less than or equal to the WQE 141 * basic block size, as an optimization, we can stamp all WQEs with 142 * 0xffffffff, and skip the very first chunk of each WQE. 143 */ 144 static void stamp_send_wqe(struct mlx4_ib_qp *qp, int n, int size) 145 { 146 __be32 *wqe; 147 int i; 148 int s; 149 int ind; 150 void *buf; 151 __be32 stamp; 152 struct mlx4_wqe_ctrl_seg *ctrl; 153 154 if (qp->sq_max_wqes_per_wr > 1) { 155 s = roundup(size, 1U << qp->sq.wqe_shift); 156 for (i = 0; i < s; i += 64) { 157 ind = (i >> qp->sq.wqe_shift) + n; 158 stamp = ind & qp->sq.wqe_cnt ? cpu_to_be32(0x7fffffff) : 159 cpu_to_be32(0xffffffff); 160 buf = get_send_wqe(qp, ind & (qp->sq.wqe_cnt - 1)); 161 wqe = buf + (i & ((1 << qp->sq.wqe_shift) - 1)); 162 *wqe = stamp; 163 } 164 } else { 165 ctrl = buf = get_send_wqe(qp, n & (qp->sq.wqe_cnt - 1)); 166 s = (ctrl->fence_size & 0x3f) << 4; 167 for (i = 64; i < s; i += 64) { 168 wqe = buf + i; 169 *wqe = cpu_to_be32(0xffffffff); 170 } 171 } 172 } 173 174 static void post_nop_wqe(struct mlx4_ib_qp *qp, int n, int size) 175 { 176 struct mlx4_wqe_ctrl_seg *ctrl; 177 struct mlx4_wqe_inline_seg *inl; 178 void *wqe; 179 int s; 180 181 ctrl = wqe = get_send_wqe(qp, n & (qp->sq.wqe_cnt - 1)); 182 s = sizeof(struct mlx4_wqe_ctrl_seg); 183 184 if (qp->ibqp.qp_type == IB_QPT_UD) { 185 struct mlx4_wqe_datagram_seg *dgram = wqe + sizeof *ctrl; 186 struct mlx4_av *av = (struct mlx4_av *)dgram->av; 187 memset(dgram, 0, sizeof *dgram); 188 av->port_pd = cpu_to_be32((qp->port << 24) | to_mpd(qp->ibqp.pd)->pdn); 189 s += sizeof(struct mlx4_wqe_datagram_seg); 190 } 191 192 /* Pad the remainder of the WQE with an inline data segment. */ 193 if (size > s) { 194 inl = wqe + s; 195 inl->byte_count = cpu_to_be32(1 << 31 | (size - s - sizeof *inl)); 196 } 197 ctrl->srcrb_flags = 0; 198 ctrl->fence_size = size / 16; 199 /* 200 * Make sure descriptor is fully written before setting ownership bit 201 * (because HW can start executing as soon as we do). 202 */ 203 wmb(); 204 205 ctrl->owner_opcode = cpu_to_be32(MLX4_OPCODE_NOP | MLX4_WQE_CTRL_NEC) | 206 (n & qp->sq.wqe_cnt ? cpu_to_be32(1 << 31) : 0); 207 208 stamp_send_wqe(qp, n + qp->sq_spare_wqes, size); 209 } 210 211 /* Post NOP WQE to prevent wrap-around in the middle of WR */ 212 static inline unsigned pad_wraparound(struct mlx4_ib_qp *qp, int ind) 213 { 214 unsigned s = qp->sq.wqe_cnt - (ind & (qp->sq.wqe_cnt - 1)); 215 if (unlikely(s < qp->sq_max_wqes_per_wr)) { 216 post_nop_wqe(qp, ind, s << qp->sq.wqe_shift); 217 ind += s; 218 } 219 return ind; 220 } 221 222 static void mlx4_ib_qp_event(struct mlx4_qp *qp, enum mlx4_event type) 223 { 224 struct ib_event event; 225 struct ib_qp *ibqp = &to_mibqp(qp)->ibqp; 226 227 if (type == MLX4_EVENT_TYPE_PATH_MIG) 228 to_mibqp(qp)->port = to_mibqp(qp)->alt_port; 229 230 if (ibqp->event_handler) { 231 event.device = ibqp->device; 232 event.element.qp = ibqp; 233 switch (type) { 234 case MLX4_EVENT_TYPE_PATH_MIG: 235 event.event = IB_EVENT_PATH_MIG; 236 break; 237 case MLX4_EVENT_TYPE_COMM_EST: 238 event.event = IB_EVENT_COMM_EST; 239 break; 240 case MLX4_EVENT_TYPE_SQ_DRAINED: 241 event.event = IB_EVENT_SQ_DRAINED; 242 break; 243 case MLX4_EVENT_TYPE_SRQ_QP_LAST_WQE: 244 event.event = IB_EVENT_QP_LAST_WQE_REACHED; 245 break; 246 case MLX4_EVENT_TYPE_WQ_CATAS_ERROR: 247 event.event = IB_EVENT_QP_FATAL; 248 break; 249 case MLX4_EVENT_TYPE_PATH_MIG_FAILED: 250 event.event = IB_EVENT_PATH_MIG_ERR; 251 break; 252 case MLX4_EVENT_TYPE_WQ_INVAL_REQ_ERROR: 253 event.event = IB_EVENT_QP_REQ_ERR; 254 break; 255 case MLX4_EVENT_TYPE_WQ_ACCESS_ERROR: 256 event.event = IB_EVENT_QP_ACCESS_ERR; 257 break; 258 default: 259 printk(KERN_WARNING "mlx4_ib: Unexpected event type %d " 260 "on QP %06x\n", type, qp->qpn); 261 return; 262 } 263 264 ibqp->event_handler(&event, ibqp->qp_context); 265 } 266 } 267 268 static int send_wqe_overhead(enum ib_qp_type type, u32 flags) 269 { 270 /* 271 * UD WQEs must have a datagram segment. 272 * RC and UC WQEs might have a remote address segment. 273 * MLX WQEs need two extra inline data segments (for the UD 274 * header and space for the ICRC). 275 */ 276 switch (type) { 277 case IB_QPT_UD: 278 return sizeof (struct mlx4_wqe_ctrl_seg) + 279 sizeof (struct mlx4_wqe_datagram_seg) + 280 ((flags & MLX4_IB_QP_LSO) ? MLX4_IB_LSO_HEADER_SPARE : 0); 281 case IB_QPT_UC: 282 return sizeof (struct mlx4_wqe_ctrl_seg) + 283 sizeof (struct mlx4_wqe_raddr_seg); 284 case IB_QPT_RC: 285 return sizeof (struct mlx4_wqe_ctrl_seg) + 286 sizeof (struct mlx4_wqe_atomic_seg) + 287 sizeof (struct mlx4_wqe_raddr_seg); 288 case IB_QPT_SMI: 289 case IB_QPT_GSI: 290 return sizeof (struct mlx4_wqe_ctrl_seg) + 291 ALIGN(MLX4_IB_UD_HEADER_SIZE + 292 DIV_ROUND_UP(MLX4_IB_UD_HEADER_SIZE, 293 MLX4_INLINE_ALIGN) * 294 sizeof (struct mlx4_wqe_inline_seg), 295 sizeof (struct mlx4_wqe_data_seg)) + 296 ALIGN(4 + 297 sizeof (struct mlx4_wqe_inline_seg), 298 sizeof (struct mlx4_wqe_data_seg)); 299 default: 300 return sizeof (struct mlx4_wqe_ctrl_seg); 301 } 302 } 303 304 static int set_rq_size(struct mlx4_ib_dev *dev, struct ib_qp_cap *cap, 305 int is_user, int has_srq, struct mlx4_ib_qp *qp) 306 { 307 /* Sanity check RQ size before proceeding */ 308 if (cap->max_recv_wr > dev->dev->caps.max_wqes || 309 cap->max_recv_sge > dev->dev->caps.max_rq_sg) 310 return -EINVAL; 311 312 if (has_srq) { 313 /* QPs attached to an SRQ should have no RQ */ 314 if (cap->max_recv_wr) 315 return -EINVAL; 316 317 qp->rq.wqe_cnt = qp->rq.max_gs = 0; 318 } else { 319 /* HW requires >= 1 RQ entry with >= 1 gather entry */ 320 if (is_user && (!cap->max_recv_wr || !cap->max_recv_sge)) 321 return -EINVAL; 322 323 qp->rq.wqe_cnt = roundup_pow_of_two(max(1U, cap->max_recv_wr)); 324 qp->rq.max_gs = roundup_pow_of_two(max(1U, cap->max_recv_sge)); 325 qp->rq.wqe_shift = ilog2(qp->rq.max_gs * sizeof (struct mlx4_wqe_data_seg)); 326 } 327 328 cap->max_recv_wr = qp->rq.max_post = qp->rq.wqe_cnt; 329 cap->max_recv_sge = qp->rq.max_gs; 330 331 return 0; 332 } 333 334 static int set_kernel_sq_size(struct mlx4_ib_dev *dev, struct ib_qp_cap *cap, 335 enum ib_qp_type type, struct mlx4_ib_qp *qp) 336 { 337 int s; 338 339 /* Sanity check SQ size before proceeding */ 340 if (cap->max_send_wr > dev->dev->caps.max_wqes || 341 cap->max_send_sge > dev->dev->caps.max_sq_sg || 342 cap->max_inline_data + send_wqe_overhead(type, qp->flags) + 343 sizeof (struct mlx4_wqe_inline_seg) > dev->dev->caps.max_sq_desc_sz) 344 return -EINVAL; 345 346 /* 347 * For MLX transport we need 2 extra S/G entries: 348 * one for the header and one for the checksum at the end 349 */ 350 if ((type == IB_QPT_SMI || type == IB_QPT_GSI) && 351 cap->max_send_sge + 2 > dev->dev->caps.max_sq_sg) 352 return -EINVAL; 353 354 s = max(cap->max_send_sge * sizeof (struct mlx4_wqe_data_seg), 355 cap->max_inline_data + sizeof (struct mlx4_wqe_inline_seg)) + 356 send_wqe_overhead(type, qp->flags); 357 358 if (s > dev->dev->caps.max_sq_desc_sz) 359 return -EINVAL; 360 361 /* 362 * Hermon supports shrinking WQEs, such that a single work 363 * request can include multiple units of 1 << wqe_shift. This 364 * way, work requests can differ in size, and do not have to 365 * be a power of 2 in size, saving memory and speeding up send 366 * WR posting. Unfortunately, if we do this then the 367 * wqe_index field in CQEs can't be used to look up the WR ID 368 * anymore, so we do this only if selective signaling is off. 369 * 370 * Further, on 32-bit platforms, we can't use vmap() to make 371 * the QP buffer virtually contiguous. Thus we have to use 372 * constant-sized WRs to make sure a WR is always fully within 373 * a single page-sized chunk. 374 * 375 * Finally, we use NOP work requests to pad the end of the 376 * work queue, to avoid wrap-around in the middle of WR. We 377 * set NEC bit to avoid getting completions with error for 378 * these NOP WRs, but since NEC is only supported starting 379 * with firmware 2.2.232, we use constant-sized WRs for older 380 * firmware. 381 * 382 * And, since MLX QPs only support SEND, we use constant-sized 383 * WRs in this case. 384 * 385 * We look for the smallest value of wqe_shift such that the 386 * resulting number of wqes does not exceed device 387 * capabilities. 388 * 389 * We set WQE size to at least 64 bytes, this way stamping 390 * invalidates each WQE. 391 */ 392 if (dev->dev->caps.fw_ver >= MLX4_FW_VER_WQE_CTRL_NEC && 393 qp->sq_signal_bits && BITS_PER_LONG == 64 && 394 type != IB_QPT_SMI && type != IB_QPT_GSI) 395 qp->sq.wqe_shift = ilog2(64); 396 else 397 qp->sq.wqe_shift = ilog2(roundup_pow_of_two(s)); 398 399 for (;;) { 400 qp->sq_max_wqes_per_wr = DIV_ROUND_UP(s, 1U << qp->sq.wqe_shift); 401 402 /* 403 * We need to leave 2 KB + 1 WR of headroom in the SQ to 404 * allow HW to prefetch. 405 */ 406 qp->sq_spare_wqes = (2048 >> qp->sq.wqe_shift) + qp->sq_max_wqes_per_wr; 407 qp->sq.wqe_cnt = roundup_pow_of_two(cap->max_send_wr * 408 qp->sq_max_wqes_per_wr + 409 qp->sq_spare_wqes); 410 411 if (qp->sq.wqe_cnt <= dev->dev->caps.max_wqes) 412 break; 413 414 if (qp->sq_max_wqes_per_wr <= 1) 415 return -EINVAL; 416 417 ++qp->sq.wqe_shift; 418 } 419 420 qp->sq.max_gs = (min(dev->dev->caps.max_sq_desc_sz, 421 (qp->sq_max_wqes_per_wr << qp->sq.wqe_shift)) - 422 send_wqe_overhead(type, qp->flags)) / 423 sizeof (struct mlx4_wqe_data_seg); 424 425 qp->buf_size = (qp->rq.wqe_cnt << qp->rq.wqe_shift) + 426 (qp->sq.wqe_cnt << qp->sq.wqe_shift); 427 if (qp->rq.wqe_shift > qp->sq.wqe_shift) { 428 qp->rq.offset = 0; 429 qp->sq.offset = qp->rq.wqe_cnt << qp->rq.wqe_shift; 430 } else { 431 qp->rq.offset = qp->sq.wqe_cnt << qp->sq.wqe_shift; 432 qp->sq.offset = 0; 433 } 434 435 cap->max_send_wr = qp->sq.max_post = 436 (qp->sq.wqe_cnt - qp->sq_spare_wqes) / qp->sq_max_wqes_per_wr; 437 cap->max_send_sge = min(qp->sq.max_gs, 438 min(dev->dev->caps.max_sq_sg, 439 dev->dev->caps.max_rq_sg)); 440 /* We don't support inline sends for kernel QPs (yet) */ 441 cap->max_inline_data = 0; 442 443 return 0; 444 } 445 446 static int set_user_sq_size(struct mlx4_ib_dev *dev, 447 struct mlx4_ib_qp *qp, 448 struct mlx4_ib_create_qp *ucmd) 449 { 450 /* Sanity check SQ size before proceeding */ 451 if ((1 << ucmd->log_sq_bb_count) > dev->dev->caps.max_wqes || 452 ucmd->log_sq_stride > 453 ilog2(roundup_pow_of_two(dev->dev->caps.max_sq_desc_sz)) || 454 ucmd->log_sq_stride < MLX4_IB_MIN_SQ_STRIDE) 455 return -EINVAL; 456 457 qp->sq.wqe_cnt = 1 << ucmd->log_sq_bb_count; 458 qp->sq.wqe_shift = ucmd->log_sq_stride; 459 460 qp->buf_size = (qp->rq.wqe_cnt << qp->rq.wqe_shift) + 461 (qp->sq.wqe_cnt << qp->sq.wqe_shift); 462 463 return 0; 464 } 465 466 static int create_qp_common(struct mlx4_ib_dev *dev, struct ib_pd *pd, 467 struct ib_qp_init_attr *init_attr, 468 struct ib_udata *udata, int sqpn, struct mlx4_ib_qp *qp) 469 { 470 int qpn; 471 int err; 472 473 mutex_init(&qp->mutex); 474 spin_lock_init(&qp->sq.lock); 475 spin_lock_init(&qp->rq.lock); 476 INIT_LIST_HEAD(&qp->gid_list); 477 478 qp->state = IB_QPS_RESET; 479 if (init_attr->sq_sig_type == IB_SIGNAL_ALL_WR) 480 qp->sq_signal_bits = cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE); 481 482 err = set_rq_size(dev, &init_attr->cap, !!pd->uobject, !!init_attr->srq, qp); 483 if (err) 484 goto err; 485 486 if (pd->uobject) { 487 struct mlx4_ib_create_qp ucmd; 488 489 if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) { 490 err = -EFAULT; 491 goto err; 492 } 493 494 qp->sq_no_prefetch = ucmd.sq_no_prefetch; 495 496 err = set_user_sq_size(dev, qp, &ucmd); 497 if (err) 498 goto err; 499 500 qp->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr, 501 qp->buf_size, 0, 0); 502 if (IS_ERR(qp->umem)) { 503 err = PTR_ERR(qp->umem); 504 goto err; 505 } 506 507 err = mlx4_mtt_init(dev->dev, ib_umem_page_count(qp->umem), 508 ilog2(qp->umem->page_size), &qp->mtt); 509 if (err) 510 goto err_buf; 511 512 err = mlx4_ib_umem_write_mtt(dev, &qp->mtt, qp->umem); 513 if (err) 514 goto err_mtt; 515 516 if (!init_attr->srq) { 517 err = mlx4_ib_db_map_user(to_mucontext(pd->uobject->context), 518 ucmd.db_addr, &qp->db); 519 if (err) 520 goto err_mtt; 521 } 522 } else { 523 qp->sq_no_prefetch = 0; 524 525 if (init_attr->create_flags & IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK) 526 qp->flags |= MLX4_IB_QP_BLOCK_MULTICAST_LOOPBACK; 527 528 if (init_attr->create_flags & IB_QP_CREATE_IPOIB_UD_LSO) 529 qp->flags |= MLX4_IB_QP_LSO; 530 531 err = set_kernel_sq_size(dev, &init_attr->cap, init_attr->qp_type, qp); 532 if (err) 533 goto err; 534 535 if (!init_attr->srq) { 536 err = mlx4_db_alloc(dev->dev, &qp->db, 0); 537 if (err) 538 goto err; 539 540 *qp->db.db = 0; 541 } 542 543 if (mlx4_buf_alloc(dev->dev, qp->buf_size, PAGE_SIZE * 2, &qp->buf)) { 544 err = -ENOMEM; 545 goto err_db; 546 } 547 548 err = mlx4_mtt_init(dev->dev, qp->buf.npages, qp->buf.page_shift, 549 &qp->mtt); 550 if (err) 551 goto err_buf; 552 553 err = mlx4_buf_write_mtt(dev->dev, &qp->mtt, &qp->buf); 554 if (err) 555 goto err_mtt; 556 557 qp->sq.wrid = kmalloc(qp->sq.wqe_cnt * sizeof (u64), GFP_KERNEL); 558 qp->rq.wrid = kmalloc(qp->rq.wqe_cnt * sizeof (u64), GFP_KERNEL); 559 560 if (!qp->sq.wrid || !qp->rq.wrid) { 561 err = -ENOMEM; 562 goto err_wrid; 563 } 564 } 565 566 if (sqpn) { 567 qpn = sqpn; 568 } else { 569 err = mlx4_qp_reserve_range(dev->dev, 1, 1, &qpn); 570 if (err) 571 goto err_wrid; 572 } 573 574 err = mlx4_qp_alloc(dev->dev, qpn, &qp->mqp); 575 if (err) 576 goto err_qpn; 577 578 /* 579 * Hardware wants QPN written in big-endian order (after 580 * shifting) for send doorbell. Precompute this value to save 581 * a little bit when posting sends. 582 */ 583 qp->doorbell_qpn = swab32(qp->mqp.qpn << 8); 584 585 qp->mqp.event = mlx4_ib_qp_event; 586 587 return 0; 588 589 err_qpn: 590 if (!sqpn) 591 mlx4_qp_release_range(dev->dev, qpn, 1); 592 593 err_wrid: 594 if (pd->uobject) { 595 if (!init_attr->srq) 596 mlx4_ib_db_unmap_user(to_mucontext(pd->uobject->context), 597 &qp->db); 598 } else { 599 kfree(qp->sq.wrid); 600 kfree(qp->rq.wrid); 601 } 602 603 err_mtt: 604 mlx4_mtt_cleanup(dev->dev, &qp->mtt); 605 606 err_buf: 607 if (pd->uobject) 608 ib_umem_release(qp->umem); 609 else 610 mlx4_buf_free(dev->dev, qp->buf_size, &qp->buf); 611 612 err_db: 613 if (!pd->uobject && !init_attr->srq) 614 mlx4_db_free(dev->dev, &qp->db); 615 616 err: 617 return err; 618 } 619 620 static enum mlx4_qp_state to_mlx4_state(enum ib_qp_state state) 621 { 622 switch (state) { 623 case IB_QPS_RESET: return MLX4_QP_STATE_RST; 624 case IB_QPS_INIT: return MLX4_QP_STATE_INIT; 625 case IB_QPS_RTR: return MLX4_QP_STATE_RTR; 626 case IB_QPS_RTS: return MLX4_QP_STATE_RTS; 627 case IB_QPS_SQD: return MLX4_QP_STATE_SQD; 628 case IB_QPS_SQE: return MLX4_QP_STATE_SQER; 629 case IB_QPS_ERR: return MLX4_QP_STATE_ERR; 630 default: return -1; 631 } 632 } 633 634 static void mlx4_ib_lock_cqs(struct mlx4_ib_cq *send_cq, struct mlx4_ib_cq *recv_cq) 635 __acquires(&send_cq->lock) __acquires(&recv_cq->lock) 636 { 637 if (send_cq == recv_cq) { 638 spin_lock_irq(&send_cq->lock); 639 __acquire(&recv_cq->lock); 640 } else if (send_cq->mcq.cqn < recv_cq->mcq.cqn) { 641 spin_lock_irq(&send_cq->lock); 642 spin_lock_nested(&recv_cq->lock, SINGLE_DEPTH_NESTING); 643 } else { 644 spin_lock_irq(&recv_cq->lock); 645 spin_lock_nested(&send_cq->lock, SINGLE_DEPTH_NESTING); 646 } 647 } 648 649 static void mlx4_ib_unlock_cqs(struct mlx4_ib_cq *send_cq, struct mlx4_ib_cq *recv_cq) 650 __releases(&send_cq->lock) __releases(&recv_cq->lock) 651 { 652 if (send_cq == recv_cq) { 653 __release(&recv_cq->lock); 654 spin_unlock_irq(&send_cq->lock); 655 } else if (send_cq->mcq.cqn < recv_cq->mcq.cqn) { 656 spin_unlock(&recv_cq->lock); 657 spin_unlock_irq(&send_cq->lock); 658 } else { 659 spin_unlock(&send_cq->lock); 660 spin_unlock_irq(&recv_cq->lock); 661 } 662 } 663 664 static void del_gid_entries(struct mlx4_ib_qp *qp) 665 { 666 struct mlx4_ib_gid_entry *ge, *tmp; 667 668 list_for_each_entry_safe(ge, tmp, &qp->gid_list, list) { 669 list_del(&ge->list); 670 kfree(ge); 671 } 672 } 673 674 static void destroy_qp_common(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp, 675 int is_user) 676 { 677 struct mlx4_ib_cq *send_cq, *recv_cq; 678 679 if (qp->state != IB_QPS_RESET) 680 if (mlx4_qp_modify(dev->dev, NULL, to_mlx4_state(qp->state), 681 MLX4_QP_STATE_RST, NULL, 0, 0, &qp->mqp)) 682 printk(KERN_WARNING "mlx4_ib: modify QP %06x to RESET failed.\n", 683 qp->mqp.qpn); 684 685 send_cq = to_mcq(qp->ibqp.send_cq); 686 recv_cq = to_mcq(qp->ibqp.recv_cq); 687 688 mlx4_ib_lock_cqs(send_cq, recv_cq); 689 690 if (!is_user) { 691 __mlx4_ib_cq_clean(recv_cq, qp->mqp.qpn, 692 qp->ibqp.srq ? to_msrq(qp->ibqp.srq): NULL); 693 if (send_cq != recv_cq) 694 __mlx4_ib_cq_clean(send_cq, qp->mqp.qpn, NULL); 695 } 696 697 mlx4_qp_remove(dev->dev, &qp->mqp); 698 699 mlx4_ib_unlock_cqs(send_cq, recv_cq); 700 701 mlx4_qp_free(dev->dev, &qp->mqp); 702 703 if (!is_sqp(dev, qp)) 704 mlx4_qp_release_range(dev->dev, qp->mqp.qpn, 1); 705 706 mlx4_mtt_cleanup(dev->dev, &qp->mtt); 707 708 if (is_user) { 709 if (!qp->ibqp.srq) 710 mlx4_ib_db_unmap_user(to_mucontext(qp->ibqp.uobject->context), 711 &qp->db); 712 ib_umem_release(qp->umem); 713 } else { 714 kfree(qp->sq.wrid); 715 kfree(qp->rq.wrid); 716 mlx4_buf_free(dev->dev, qp->buf_size, &qp->buf); 717 if (!qp->ibqp.srq) 718 mlx4_db_free(dev->dev, &qp->db); 719 } 720 721 del_gid_entries(qp); 722 } 723 724 struct ib_qp *mlx4_ib_create_qp(struct ib_pd *pd, 725 struct ib_qp_init_attr *init_attr, 726 struct ib_udata *udata) 727 { 728 struct mlx4_ib_dev *dev = to_mdev(pd->device); 729 struct mlx4_ib_sqp *sqp; 730 struct mlx4_ib_qp *qp; 731 int err; 732 733 /* 734 * We only support LSO and multicast loopback blocking, and 735 * only for kernel UD QPs. 736 */ 737 if (init_attr->create_flags & ~(IB_QP_CREATE_IPOIB_UD_LSO | 738 IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK)) 739 return ERR_PTR(-EINVAL); 740 741 if (init_attr->create_flags && 742 (pd->uobject || init_attr->qp_type != IB_QPT_UD)) 743 return ERR_PTR(-EINVAL); 744 745 switch (init_attr->qp_type) { 746 case IB_QPT_RC: 747 case IB_QPT_UC: 748 case IB_QPT_UD: 749 { 750 qp = kzalloc(sizeof *qp, GFP_KERNEL); 751 if (!qp) 752 return ERR_PTR(-ENOMEM); 753 754 err = create_qp_common(dev, pd, init_attr, udata, 0, qp); 755 if (err) { 756 kfree(qp); 757 return ERR_PTR(err); 758 } 759 760 qp->ibqp.qp_num = qp->mqp.qpn; 761 762 break; 763 } 764 case IB_QPT_SMI: 765 case IB_QPT_GSI: 766 { 767 /* Userspace is not allowed to create special QPs: */ 768 if (pd->uobject) 769 return ERR_PTR(-EINVAL); 770 771 sqp = kzalloc(sizeof *sqp, GFP_KERNEL); 772 if (!sqp) 773 return ERR_PTR(-ENOMEM); 774 775 qp = &sqp->qp; 776 777 err = create_qp_common(dev, pd, init_attr, udata, 778 dev->dev->caps.sqp_start + 779 (init_attr->qp_type == IB_QPT_SMI ? 0 : 2) + 780 init_attr->port_num - 1, 781 qp); 782 if (err) { 783 kfree(sqp); 784 return ERR_PTR(err); 785 } 786 787 qp->port = init_attr->port_num; 788 qp->ibqp.qp_num = init_attr->qp_type == IB_QPT_SMI ? 0 : 1; 789 790 break; 791 } 792 default: 793 /* Don't support raw QPs */ 794 return ERR_PTR(-EINVAL); 795 } 796 797 return &qp->ibqp; 798 } 799 800 int mlx4_ib_destroy_qp(struct ib_qp *qp) 801 { 802 struct mlx4_ib_dev *dev = to_mdev(qp->device); 803 struct mlx4_ib_qp *mqp = to_mqp(qp); 804 805 if (is_qp0(dev, mqp)) 806 mlx4_CLOSE_PORT(dev->dev, mqp->port); 807 808 destroy_qp_common(dev, mqp, !!qp->pd->uobject); 809 810 if (is_sqp(dev, mqp)) 811 kfree(to_msqp(mqp)); 812 else 813 kfree(mqp); 814 815 return 0; 816 } 817 818 static int to_mlx4_st(enum ib_qp_type type) 819 { 820 switch (type) { 821 case IB_QPT_RC: return MLX4_QP_ST_RC; 822 case IB_QPT_UC: return MLX4_QP_ST_UC; 823 case IB_QPT_UD: return MLX4_QP_ST_UD; 824 case IB_QPT_SMI: 825 case IB_QPT_GSI: return MLX4_QP_ST_MLX; 826 default: return -1; 827 } 828 } 829 830 static __be32 to_mlx4_access_flags(struct mlx4_ib_qp *qp, const struct ib_qp_attr *attr, 831 int attr_mask) 832 { 833 u8 dest_rd_atomic; 834 u32 access_flags; 835 u32 hw_access_flags = 0; 836 837 if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC) 838 dest_rd_atomic = attr->max_dest_rd_atomic; 839 else 840 dest_rd_atomic = qp->resp_depth; 841 842 if (attr_mask & IB_QP_ACCESS_FLAGS) 843 access_flags = attr->qp_access_flags; 844 else 845 access_flags = qp->atomic_rd_en; 846 847 if (!dest_rd_atomic) 848 access_flags &= IB_ACCESS_REMOTE_WRITE; 849 850 if (access_flags & IB_ACCESS_REMOTE_READ) 851 hw_access_flags |= MLX4_QP_BIT_RRE; 852 if (access_flags & IB_ACCESS_REMOTE_ATOMIC) 853 hw_access_flags |= MLX4_QP_BIT_RAE; 854 if (access_flags & IB_ACCESS_REMOTE_WRITE) 855 hw_access_flags |= MLX4_QP_BIT_RWE; 856 857 return cpu_to_be32(hw_access_flags); 858 } 859 860 static void store_sqp_attrs(struct mlx4_ib_sqp *sqp, const struct ib_qp_attr *attr, 861 int attr_mask) 862 { 863 if (attr_mask & IB_QP_PKEY_INDEX) 864 sqp->pkey_index = attr->pkey_index; 865 if (attr_mask & IB_QP_QKEY) 866 sqp->qkey = attr->qkey; 867 if (attr_mask & IB_QP_SQ_PSN) 868 sqp->send_psn = attr->sq_psn; 869 } 870 871 static void mlx4_set_sched(struct mlx4_qp_path *path, u8 port) 872 { 873 path->sched_queue = (path->sched_queue & 0xbf) | ((port - 1) << 6); 874 } 875 876 static int mlx4_set_path(struct mlx4_ib_dev *dev, const struct ib_ah_attr *ah, 877 struct mlx4_qp_path *path, u8 port) 878 { 879 int err; 880 int is_eth = rdma_port_get_link_layer(&dev->ib_dev, port) == 881 IB_LINK_LAYER_ETHERNET; 882 u8 mac[6]; 883 int is_mcast; 884 u16 vlan_tag; 885 int vidx; 886 887 path->grh_mylmc = ah->src_path_bits & 0x7f; 888 path->rlid = cpu_to_be16(ah->dlid); 889 if (ah->static_rate) { 890 path->static_rate = ah->static_rate + MLX4_STAT_RATE_OFFSET; 891 while (path->static_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET && 892 !(1 << path->static_rate & dev->dev->caps.stat_rate_support)) 893 --path->static_rate; 894 } else 895 path->static_rate = 0; 896 897 if (ah->ah_flags & IB_AH_GRH) { 898 if (ah->grh.sgid_index >= dev->dev->caps.gid_table_len[port]) { 899 printk(KERN_ERR "sgid_index (%u) too large. max is %d\n", 900 ah->grh.sgid_index, dev->dev->caps.gid_table_len[port] - 1); 901 return -1; 902 } 903 904 path->grh_mylmc |= 1 << 7; 905 path->mgid_index = ah->grh.sgid_index; 906 path->hop_limit = ah->grh.hop_limit; 907 path->tclass_flowlabel = 908 cpu_to_be32((ah->grh.traffic_class << 20) | 909 (ah->grh.flow_label)); 910 memcpy(path->rgid, ah->grh.dgid.raw, 16); 911 } 912 913 if (is_eth) { 914 path->sched_queue = MLX4_IB_DEFAULT_SCHED_QUEUE | 915 ((port - 1) << 6) | ((ah->sl & 7) << 3) | ((ah->sl & 8) >> 1); 916 917 if (!(ah->ah_flags & IB_AH_GRH)) 918 return -1; 919 920 err = mlx4_ib_resolve_grh(dev, ah, mac, &is_mcast, port); 921 if (err) 922 return err; 923 924 memcpy(path->dmac, mac, 6); 925 path->ackto = MLX4_IB_LINK_TYPE_ETH; 926 /* use index 0 into MAC table for IBoE */ 927 path->grh_mylmc &= 0x80; 928 929 vlan_tag = rdma_get_vlan_id(&dev->iboe.gid_table[port - 1][ah->grh.sgid_index]); 930 if (vlan_tag < 0x1000) { 931 if (mlx4_find_cached_vlan(dev->dev, port, vlan_tag, &vidx)) 932 return -ENOENT; 933 934 path->vlan_index = vidx; 935 path->fl = 1 << 6; 936 } 937 } else 938 path->sched_queue = MLX4_IB_DEFAULT_SCHED_QUEUE | 939 ((port - 1) << 6) | ((ah->sl & 0xf) << 2); 940 941 return 0; 942 } 943 944 static void update_mcg_macs(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp) 945 { 946 struct mlx4_ib_gid_entry *ge, *tmp; 947 948 list_for_each_entry_safe(ge, tmp, &qp->gid_list, list) { 949 if (!ge->added && mlx4_ib_add_mc(dev, qp, &ge->gid)) { 950 ge->added = 1; 951 ge->port = qp->port; 952 } 953 } 954 } 955 956 static int __mlx4_ib_modify_qp(struct ib_qp *ibqp, 957 const struct ib_qp_attr *attr, int attr_mask, 958 enum ib_qp_state cur_state, enum ib_qp_state new_state) 959 { 960 struct mlx4_ib_dev *dev = to_mdev(ibqp->device); 961 struct mlx4_ib_qp *qp = to_mqp(ibqp); 962 struct mlx4_qp_context *context; 963 enum mlx4_qp_optpar optpar = 0; 964 int sqd_event; 965 int err = -EINVAL; 966 967 context = kzalloc(sizeof *context, GFP_KERNEL); 968 if (!context) 969 return -ENOMEM; 970 971 context->flags = cpu_to_be32((to_mlx4_state(new_state) << 28) | 972 (to_mlx4_st(ibqp->qp_type) << 16)); 973 974 if (!(attr_mask & IB_QP_PATH_MIG_STATE)) 975 context->flags |= cpu_to_be32(MLX4_QP_PM_MIGRATED << 11); 976 else { 977 optpar |= MLX4_QP_OPTPAR_PM_STATE; 978 switch (attr->path_mig_state) { 979 case IB_MIG_MIGRATED: 980 context->flags |= cpu_to_be32(MLX4_QP_PM_MIGRATED << 11); 981 break; 982 case IB_MIG_REARM: 983 context->flags |= cpu_to_be32(MLX4_QP_PM_REARM << 11); 984 break; 985 case IB_MIG_ARMED: 986 context->flags |= cpu_to_be32(MLX4_QP_PM_ARMED << 11); 987 break; 988 } 989 } 990 991 if (ibqp->qp_type == IB_QPT_GSI || ibqp->qp_type == IB_QPT_SMI) 992 context->mtu_msgmax = (IB_MTU_4096 << 5) | 11; 993 else if (ibqp->qp_type == IB_QPT_UD) { 994 if (qp->flags & MLX4_IB_QP_LSO) 995 context->mtu_msgmax = (IB_MTU_4096 << 5) | 996 ilog2(dev->dev->caps.max_gso_sz); 997 else 998 context->mtu_msgmax = (IB_MTU_4096 << 5) | 12; 999 } else if (attr_mask & IB_QP_PATH_MTU) { 1000 if (attr->path_mtu < IB_MTU_256 || attr->path_mtu > IB_MTU_4096) { 1001 printk(KERN_ERR "path MTU (%u) is invalid\n", 1002 attr->path_mtu); 1003 goto out; 1004 } 1005 context->mtu_msgmax = (attr->path_mtu << 5) | 1006 ilog2(dev->dev->caps.max_msg_sz); 1007 } 1008 1009 if (qp->rq.wqe_cnt) 1010 context->rq_size_stride = ilog2(qp->rq.wqe_cnt) << 3; 1011 context->rq_size_stride |= qp->rq.wqe_shift - 4; 1012 1013 if (qp->sq.wqe_cnt) 1014 context->sq_size_stride = ilog2(qp->sq.wqe_cnt) << 3; 1015 context->sq_size_stride |= qp->sq.wqe_shift - 4; 1016 1017 if (cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT) 1018 context->sq_size_stride |= !!qp->sq_no_prefetch << 7; 1019 1020 if (qp->ibqp.uobject) 1021 context->usr_page = cpu_to_be32(to_mucontext(ibqp->uobject->context)->uar.index); 1022 else 1023 context->usr_page = cpu_to_be32(dev->priv_uar.index); 1024 1025 if (attr_mask & IB_QP_DEST_QPN) 1026 context->remote_qpn = cpu_to_be32(attr->dest_qp_num); 1027 1028 if (attr_mask & IB_QP_PORT) { 1029 if (cur_state == IB_QPS_SQD && new_state == IB_QPS_SQD && 1030 !(attr_mask & IB_QP_AV)) { 1031 mlx4_set_sched(&context->pri_path, attr->port_num); 1032 optpar |= MLX4_QP_OPTPAR_SCHED_QUEUE; 1033 } 1034 } 1035 1036 if (cur_state == IB_QPS_INIT && new_state == IB_QPS_RTR) { 1037 if (dev->counters[qp->port - 1] != -1) { 1038 context->pri_path.counter_index = 1039 dev->counters[qp->port - 1]; 1040 optpar |= MLX4_QP_OPTPAR_COUNTER_INDEX; 1041 } else 1042 context->pri_path.counter_index = 0xff; 1043 } 1044 1045 if (attr_mask & IB_QP_PKEY_INDEX) { 1046 context->pri_path.pkey_index = attr->pkey_index; 1047 optpar |= MLX4_QP_OPTPAR_PKEY_INDEX; 1048 } 1049 1050 if (attr_mask & IB_QP_AV) { 1051 if (mlx4_set_path(dev, &attr->ah_attr, &context->pri_path, 1052 attr_mask & IB_QP_PORT ? attr->port_num : qp->port)) 1053 goto out; 1054 1055 optpar |= (MLX4_QP_OPTPAR_PRIMARY_ADDR_PATH | 1056 MLX4_QP_OPTPAR_SCHED_QUEUE); 1057 } 1058 1059 if (attr_mask & IB_QP_TIMEOUT) { 1060 context->pri_path.ackto |= attr->timeout << 3; 1061 optpar |= MLX4_QP_OPTPAR_ACK_TIMEOUT; 1062 } 1063 1064 if (attr_mask & IB_QP_ALT_PATH) { 1065 if (attr->alt_port_num == 0 || 1066 attr->alt_port_num > dev->dev->caps.num_ports) 1067 goto out; 1068 1069 if (attr->alt_pkey_index >= 1070 dev->dev->caps.pkey_table_len[attr->alt_port_num]) 1071 goto out; 1072 1073 if (mlx4_set_path(dev, &attr->alt_ah_attr, &context->alt_path, 1074 attr->alt_port_num)) 1075 goto out; 1076 1077 context->alt_path.pkey_index = attr->alt_pkey_index; 1078 context->alt_path.ackto = attr->alt_timeout << 3; 1079 optpar |= MLX4_QP_OPTPAR_ALT_ADDR_PATH; 1080 } 1081 1082 context->pd = cpu_to_be32(to_mpd(ibqp->pd)->pdn); 1083 context->params1 = cpu_to_be32(MLX4_IB_ACK_REQ_FREQ << 28); 1084 1085 /* Set "fast registration enabled" for all kernel QPs */ 1086 if (!qp->ibqp.uobject) 1087 context->params1 |= cpu_to_be32(1 << 11); 1088 1089 if (attr_mask & IB_QP_RNR_RETRY) { 1090 context->params1 |= cpu_to_be32(attr->rnr_retry << 13); 1091 optpar |= MLX4_QP_OPTPAR_RNR_RETRY; 1092 } 1093 1094 if (attr_mask & IB_QP_RETRY_CNT) { 1095 context->params1 |= cpu_to_be32(attr->retry_cnt << 16); 1096 optpar |= MLX4_QP_OPTPAR_RETRY_COUNT; 1097 } 1098 1099 if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC) { 1100 if (attr->max_rd_atomic) 1101 context->params1 |= 1102 cpu_to_be32(fls(attr->max_rd_atomic - 1) << 21); 1103 optpar |= MLX4_QP_OPTPAR_SRA_MAX; 1104 } 1105 1106 if (attr_mask & IB_QP_SQ_PSN) 1107 context->next_send_psn = cpu_to_be32(attr->sq_psn); 1108 1109 context->cqn_send = cpu_to_be32(to_mcq(ibqp->send_cq)->mcq.cqn); 1110 1111 if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC) { 1112 if (attr->max_dest_rd_atomic) 1113 context->params2 |= 1114 cpu_to_be32(fls(attr->max_dest_rd_atomic - 1) << 21); 1115 optpar |= MLX4_QP_OPTPAR_RRA_MAX; 1116 } 1117 1118 if (attr_mask & (IB_QP_ACCESS_FLAGS | IB_QP_MAX_DEST_RD_ATOMIC)) { 1119 context->params2 |= to_mlx4_access_flags(qp, attr, attr_mask); 1120 optpar |= MLX4_QP_OPTPAR_RWE | MLX4_QP_OPTPAR_RRE | MLX4_QP_OPTPAR_RAE; 1121 } 1122 1123 if (ibqp->srq) 1124 context->params2 |= cpu_to_be32(MLX4_QP_BIT_RIC); 1125 1126 if (attr_mask & IB_QP_MIN_RNR_TIMER) { 1127 context->rnr_nextrecvpsn |= cpu_to_be32(attr->min_rnr_timer << 24); 1128 optpar |= MLX4_QP_OPTPAR_RNR_TIMEOUT; 1129 } 1130 if (attr_mask & IB_QP_RQ_PSN) 1131 context->rnr_nextrecvpsn |= cpu_to_be32(attr->rq_psn); 1132 1133 context->cqn_recv = cpu_to_be32(to_mcq(ibqp->recv_cq)->mcq.cqn); 1134 1135 if (attr_mask & IB_QP_QKEY) { 1136 context->qkey = cpu_to_be32(attr->qkey); 1137 optpar |= MLX4_QP_OPTPAR_Q_KEY; 1138 } 1139 1140 if (ibqp->srq) 1141 context->srqn = cpu_to_be32(1 << 24 | to_msrq(ibqp->srq)->msrq.srqn); 1142 1143 if (!ibqp->srq && cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT) 1144 context->db_rec_addr = cpu_to_be64(qp->db.dma); 1145 1146 if (cur_state == IB_QPS_INIT && 1147 new_state == IB_QPS_RTR && 1148 (ibqp->qp_type == IB_QPT_GSI || ibqp->qp_type == IB_QPT_SMI || 1149 ibqp->qp_type == IB_QPT_UD)) { 1150 context->pri_path.sched_queue = (qp->port - 1) << 6; 1151 if (is_qp0(dev, qp)) 1152 context->pri_path.sched_queue |= MLX4_IB_DEFAULT_QP0_SCHED_QUEUE; 1153 else 1154 context->pri_path.sched_queue |= MLX4_IB_DEFAULT_SCHED_QUEUE; 1155 } 1156 1157 if (cur_state == IB_QPS_RTS && new_state == IB_QPS_SQD && 1158 attr_mask & IB_QP_EN_SQD_ASYNC_NOTIFY && attr->en_sqd_async_notify) 1159 sqd_event = 1; 1160 else 1161 sqd_event = 0; 1162 1163 if (!ibqp->uobject && cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT) 1164 context->rlkey |= (1 << 4); 1165 1166 /* 1167 * Before passing a kernel QP to the HW, make sure that the 1168 * ownership bits of the send queue are set and the SQ 1169 * headroom is stamped so that the hardware doesn't start 1170 * processing stale work requests. 1171 */ 1172 if (!ibqp->uobject && cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT) { 1173 struct mlx4_wqe_ctrl_seg *ctrl; 1174 int i; 1175 1176 for (i = 0; i < qp->sq.wqe_cnt; ++i) { 1177 ctrl = get_send_wqe(qp, i); 1178 ctrl->owner_opcode = cpu_to_be32(1 << 31); 1179 if (qp->sq_max_wqes_per_wr == 1) 1180 ctrl->fence_size = 1 << (qp->sq.wqe_shift - 4); 1181 1182 stamp_send_wqe(qp, i, 1 << qp->sq.wqe_shift); 1183 } 1184 } 1185 1186 err = mlx4_qp_modify(dev->dev, &qp->mtt, to_mlx4_state(cur_state), 1187 to_mlx4_state(new_state), context, optpar, 1188 sqd_event, &qp->mqp); 1189 if (err) 1190 goto out; 1191 1192 qp->state = new_state; 1193 1194 if (attr_mask & IB_QP_ACCESS_FLAGS) 1195 qp->atomic_rd_en = attr->qp_access_flags; 1196 if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC) 1197 qp->resp_depth = attr->max_dest_rd_atomic; 1198 if (attr_mask & IB_QP_PORT) { 1199 qp->port = attr->port_num; 1200 update_mcg_macs(dev, qp); 1201 } 1202 if (attr_mask & IB_QP_ALT_PATH) 1203 qp->alt_port = attr->alt_port_num; 1204 1205 if (is_sqp(dev, qp)) 1206 store_sqp_attrs(to_msqp(qp), attr, attr_mask); 1207 1208 /* 1209 * If we moved QP0 to RTR, bring the IB link up; if we moved 1210 * QP0 to RESET or ERROR, bring the link back down. 1211 */ 1212 if (is_qp0(dev, qp)) { 1213 if (cur_state != IB_QPS_RTR && new_state == IB_QPS_RTR) 1214 if (mlx4_INIT_PORT(dev->dev, qp->port)) 1215 printk(KERN_WARNING "INIT_PORT failed for port %d\n", 1216 qp->port); 1217 1218 if (cur_state != IB_QPS_RESET && cur_state != IB_QPS_ERR && 1219 (new_state == IB_QPS_RESET || new_state == IB_QPS_ERR)) 1220 mlx4_CLOSE_PORT(dev->dev, qp->port); 1221 } 1222 1223 /* 1224 * If we moved a kernel QP to RESET, clean up all old CQ 1225 * entries and reinitialize the QP. 1226 */ 1227 if (new_state == IB_QPS_RESET && !ibqp->uobject) { 1228 mlx4_ib_cq_clean(to_mcq(ibqp->recv_cq), qp->mqp.qpn, 1229 ibqp->srq ? to_msrq(ibqp->srq): NULL); 1230 if (ibqp->send_cq != ibqp->recv_cq) 1231 mlx4_ib_cq_clean(to_mcq(ibqp->send_cq), qp->mqp.qpn, NULL); 1232 1233 qp->rq.head = 0; 1234 qp->rq.tail = 0; 1235 qp->sq.head = 0; 1236 qp->sq.tail = 0; 1237 qp->sq_next_wqe = 0; 1238 if (!ibqp->srq) 1239 *qp->db.db = 0; 1240 } 1241 1242 out: 1243 kfree(context); 1244 return err; 1245 } 1246 1247 int mlx4_ib_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr, 1248 int attr_mask, struct ib_udata *udata) 1249 { 1250 struct mlx4_ib_dev *dev = to_mdev(ibqp->device); 1251 struct mlx4_ib_qp *qp = to_mqp(ibqp); 1252 enum ib_qp_state cur_state, new_state; 1253 int err = -EINVAL; 1254 1255 mutex_lock(&qp->mutex); 1256 1257 cur_state = attr_mask & IB_QP_CUR_STATE ? attr->cur_qp_state : qp->state; 1258 new_state = attr_mask & IB_QP_STATE ? attr->qp_state : cur_state; 1259 1260 if (!ib_modify_qp_is_ok(cur_state, new_state, ibqp->qp_type, attr_mask)) 1261 goto out; 1262 1263 if ((attr_mask & IB_QP_PORT) && 1264 (attr->port_num == 0 || attr->port_num > dev->dev->caps.num_ports)) { 1265 goto out; 1266 } 1267 1268 if (attr_mask & IB_QP_PKEY_INDEX) { 1269 int p = attr_mask & IB_QP_PORT ? attr->port_num : qp->port; 1270 if (attr->pkey_index >= dev->dev->caps.pkey_table_len[p]) 1271 goto out; 1272 } 1273 1274 if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC && 1275 attr->max_rd_atomic > dev->dev->caps.max_qp_init_rdma) { 1276 goto out; 1277 } 1278 1279 if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC && 1280 attr->max_dest_rd_atomic > dev->dev->caps.max_qp_dest_rdma) { 1281 goto out; 1282 } 1283 1284 if (cur_state == new_state && cur_state == IB_QPS_RESET) { 1285 err = 0; 1286 goto out; 1287 } 1288 1289 err = __mlx4_ib_modify_qp(ibqp, attr, attr_mask, cur_state, new_state); 1290 1291 out: 1292 mutex_unlock(&qp->mutex); 1293 return err; 1294 } 1295 1296 static int build_mlx_header(struct mlx4_ib_sqp *sqp, struct ib_send_wr *wr, 1297 void *wqe, unsigned *mlx_seg_len) 1298 { 1299 struct ib_device *ib_dev = sqp->qp.ibqp.device; 1300 struct mlx4_wqe_mlx_seg *mlx = wqe; 1301 struct mlx4_wqe_inline_seg *inl = wqe + sizeof *mlx; 1302 struct mlx4_ib_ah *ah = to_mah(wr->wr.ud.ah); 1303 union ib_gid sgid; 1304 u16 pkey; 1305 int send_size; 1306 int header_size; 1307 int spc; 1308 int i; 1309 int is_eth; 1310 int is_vlan = 0; 1311 int is_grh; 1312 u16 vlan; 1313 1314 send_size = 0; 1315 for (i = 0; i < wr->num_sge; ++i) 1316 send_size += wr->sg_list[i].length; 1317 1318 is_eth = rdma_port_get_link_layer(sqp->qp.ibqp.device, sqp->qp.port) == IB_LINK_LAYER_ETHERNET; 1319 is_grh = mlx4_ib_ah_grh_present(ah); 1320 if (is_eth) { 1321 ib_get_cached_gid(ib_dev, be32_to_cpu(ah->av.ib.port_pd) >> 24, 1322 ah->av.ib.gid_index, &sgid); 1323 vlan = rdma_get_vlan_id(&sgid); 1324 is_vlan = vlan < 0x1000; 1325 } 1326 ib_ud_header_init(send_size, !is_eth, is_eth, is_vlan, is_grh, 0, &sqp->ud_header); 1327 1328 if (!is_eth) { 1329 sqp->ud_header.lrh.service_level = 1330 be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 28; 1331 sqp->ud_header.lrh.destination_lid = ah->av.ib.dlid; 1332 sqp->ud_header.lrh.source_lid = cpu_to_be16(ah->av.ib.g_slid & 0x7f); 1333 } 1334 1335 if (is_grh) { 1336 sqp->ud_header.grh.traffic_class = 1337 (be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 20) & 0xff; 1338 sqp->ud_header.grh.flow_label = 1339 ah->av.ib.sl_tclass_flowlabel & cpu_to_be32(0xfffff); 1340 sqp->ud_header.grh.hop_limit = ah->av.ib.hop_limit; 1341 ib_get_cached_gid(ib_dev, be32_to_cpu(ah->av.ib.port_pd) >> 24, 1342 ah->av.ib.gid_index, &sqp->ud_header.grh.source_gid); 1343 memcpy(sqp->ud_header.grh.destination_gid.raw, 1344 ah->av.ib.dgid, 16); 1345 } 1346 1347 mlx->flags &= cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE); 1348 1349 if (!is_eth) { 1350 mlx->flags |= cpu_to_be32((!sqp->qp.ibqp.qp_num ? MLX4_WQE_MLX_VL15 : 0) | 1351 (sqp->ud_header.lrh.destination_lid == 1352 IB_LID_PERMISSIVE ? MLX4_WQE_MLX_SLR : 0) | 1353 (sqp->ud_header.lrh.service_level << 8)); 1354 mlx->rlid = sqp->ud_header.lrh.destination_lid; 1355 } 1356 1357 switch (wr->opcode) { 1358 case IB_WR_SEND: 1359 sqp->ud_header.bth.opcode = IB_OPCODE_UD_SEND_ONLY; 1360 sqp->ud_header.immediate_present = 0; 1361 break; 1362 case IB_WR_SEND_WITH_IMM: 1363 sqp->ud_header.bth.opcode = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE; 1364 sqp->ud_header.immediate_present = 1; 1365 sqp->ud_header.immediate_data = wr->ex.imm_data; 1366 break; 1367 default: 1368 return -EINVAL; 1369 } 1370 1371 if (is_eth) { 1372 u8 *smac; 1373 1374 memcpy(sqp->ud_header.eth.dmac_h, ah->av.eth.mac, 6); 1375 /* FIXME: cache smac value? */ 1376 smac = to_mdev(sqp->qp.ibqp.device)->iboe.netdevs[sqp->qp.port - 1]->dev_addr; 1377 memcpy(sqp->ud_header.eth.smac_h, smac, 6); 1378 if (!memcmp(sqp->ud_header.eth.smac_h, sqp->ud_header.eth.dmac_h, 6)) 1379 mlx->flags |= cpu_to_be32(MLX4_WQE_CTRL_FORCE_LOOPBACK); 1380 if (!is_vlan) { 1381 sqp->ud_header.eth.type = cpu_to_be16(MLX4_IB_IBOE_ETHERTYPE); 1382 } else { 1383 u16 pcp; 1384 1385 sqp->ud_header.vlan.type = cpu_to_be16(MLX4_IB_IBOE_ETHERTYPE); 1386 pcp = (be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 27 & 3) << 13; 1387 sqp->ud_header.vlan.tag = cpu_to_be16(vlan | pcp); 1388 } 1389 } else { 1390 sqp->ud_header.lrh.virtual_lane = !sqp->qp.ibqp.qp_num ? 15 : 0; 1391 if (sqp->ud_header.lrh.destination_lid == IB_LID_PERMISSIVE) 1392 sqp->ud_header.lrh.source_lid = IB_LID_PERMISSIVE; 1393 } 1394 sqp->ud_header.bth.solicited_event = !!(wr->send_flags & IB_SEND_SOLICITED); 1395 if (!sqp->qp.ibqp.qp_num) 1396 ib_get_cached_pkey(ib_dev, sqp->qp.port, sqp->pkey_index, &pkey); 1397 else 1398 ib_get_cached_pkey(ib_dev, sqp->qp.port, wr->wr.ud.pkey_index, &pkey); 1399 sqp->ud_header.bth.pkey = cpu_to_be16(pkey); 1400 sqp->ud_header.bth.destination_qpn = cpu_to_be32(wr->wr.ud.remote_qpn); 1401 sqp->ud_header.bth.psn = cpu_to_be32((sqp->send_psn++) & ((1 << 24) - 1)); 1402 sqp->ud_header.deth.qkey = cpu_to_be32(wr->wr.ud.remote_qkey & 0x80000000 ? 1403 sqp->qkey : wr->wr.ud.remote_qkey); 1404 sqp->ud_header.deth.source_qpn = cpu_to_be32(sqp->qp.ibqp.qp_num); 1405 1406 header_size = ib_ud_header_pack(&sqp->ud_header, sqp->header_buf); 1407 1408 if (0) { 1409 printk(KERN_ERR "built UD header of size %d:\n", header_size); 1410 for (i = 0; i < header_size / 4; ++i) { 1411 if (i % 8 == 0) 1412 printk(" [%02x] ", i * 4); 1413 printk(" %08x", 1414 be32_to_cpu(((__be32 *) sqp->header_buf)[i])); 1415 if ((i + 1) % 8 == 0) 1416 printk("\n"); 1417 } 1418 printk("\n"); 1419 } 1420 1421 /* 1422 * Inline data segments may not cross a 64 byte boundary. If 1423 * our UD header is bigger than the space available up to the 1424 * next 64 byte boundary in the WQE, use two inline data 1425 * segments to hold the UD header. 1426 */ 1427 spc = MLX4_INLINE_ALIGN - 1428 ((unsigned long) (inl + 1) & (MLX4_INLINE_ALIGN - 1)); 1429 if (header_size <= spc) { 1430 inl->byte_count = cpu_to_be32(1 << 31 | header_size); 1431 memcpy(inl + 1, sqp->header_buf, header_size); 1432 i = 1; 1433 } else { 1434 inl->byte_count = cpu_to_be32(1 << 31 | spc); 1435 memcpy(inl + 1, sqp->header_buf, spc); 1436 1437 inl = (void *) (inl + 1) + spc; 1438 memcpy(inl + 1, sqp->header_buf + spc, header_size - spc); 1439 /* 1440 * Need a barrier here to make sure all the data is 1441 * visible before the byte_count field is set. 1442 * Otherwise the HCA prefetcher could grab the 64-byte 1443 * chunk with this inline segment and get a valid (!= 1444 * 0xffffffff) byte count but stale data, and end up 1445 * generating a packet with bad headers. 1446 * 1447 * The first inline segment's byte_count field doesn't 1448 * need a barrier, because it comes after a 1449 * control/MLX segment and therefore is at an offset 1450 * of 16 mod 64. 1451 */ 1452 wmb(); 1453 inl->byte_count = cpu_to_be32(1 << 31 | (header_size - spc)); 1454 i = 2; 1455 } 1456 1457 *mlx_seg_len = 1458 ALIGN(i * sizeof (struct mlx4_wqe_inline_seg) + header_size, 16); 1459 return 0; 1460 } 1461 1462 static int mlx4_wq_overflow(struct mlx4_ib_wq *wq, int nreq, struct ib_cq *ib_cq) 1463 { 1464 unsigned cur; 1465 struct mlx4_ib_cq *cq; 1466 1467 cur = wq->head - wq->tail; 1468 if (likely(cur + nreq < wq->max_post)) 1469 return 0; 1470 1471 cq = to_mcq(ib_cq); 1472 spin_lock(&cq->lock); 1473 cur = wq->head - wq->tail; 1474 spin_unlock(&cq->lock); 1475 1476 return cur + nreq >= wq->max_post; 1477 } 1478 1479 static __be32 convert_access(int acc) 1480 { 1481 return (acc & IB_ACCESS_REMOTE_ATOMIC ? cpu_to_be32(MLX4_WQE_FMR_PERM_ATOMIC) : 0) | 1482 (acc & IB_ACCESS_REMOTE_WRITE ? cpu_to_be32(MLX4_WQE_FMR_PERM_REMOTE_WRITE) : 0) | 1483 (acc & IB_ACCESS_REMOTE_READ ? cpu_to_be32(MLX4_WQE_FMR_PERM_REMOTE_READ) : 0) | 1484 (acc & IB_ACCESS_LOCAL_WRITE ? cpu_to_be32(MLX4_WQE_FMR_PERM_LOCAL_WRITE) : 0) | 1485 cpu_to_be32(MLX4_WQE_FMR_PERM_LOCAL_READ); 1486 } 1487 1488 static void set_fmr_seg(struct mlx4_wqe_fmr_seg *fseg, struct ib_send_wr *wr) 1489 { 1490 struct mlx4_ib_fast_reg_page_list *mfrpl = to_mfrpl(wr->wr.fast_reg.page_list); 1491 int i; 1492 1493 for (i = 0; i < wr->wr.fast_reg.page_list_len; ++i) 1494 mfrpl->mapped_page_list[i] = 1495 cpu_to_be64(wr->wr.fast_reg.page_list->page_list[i] | 1496 MLX4_MTT_FLAG_PRESENT); 1497 1498 fseg->flags = convert_access(wr->wr.fast_reg.access_flags); 1499 fseg->mem_key = cpu_to_be32(wr->wr.fast_reg.rkey); 1500 fseg->buf_list = cpu_to_be64(mfrpl->map); 1501 fseg->start_addr = cpu_to_be64(wr->wr.fast_reg.iova_start); 1502 fseg->reg_len = cpu_to_be64(wr->wr.fast_reg.length); 1503 fseg->offset = 0; /* XXX -- is this just for ZBVA? */ 1504 fseg->page_size = cpu_to_be32(wr->wr.fast_reg.page_shift); 1505 fseg->reserved[0] = 0; 1506 fseg->reserved[1] = 0; 1507 } 1508 1509 static void set_local_inv_seg(struct mlx4_wqe_local_inval_seg *iseg, u32 rkey) 1510 { 1511 iseg->flags = 0; 1512 iseg->mem_key = cpu_to_be32(rkey); 1513 iseg->guest_id = 0; 1514 iseg->pa = 0; 1515 } 1516 1517 static __always_inline void set_raddr_seg(struct mlx4_wqe_raddr_seg *rseg, 1518 u64 remote_addr, u32 rkey) 1519 { 1520 rseg->raddr = cpu_to_be64(remote_addr); 1521 rseg->rkey = cpu_to_be32(rkey); 1522 rseg->reserved = 0; 1523 } 1524 1525 static void set_atomic_seg(struct mlx4_wqe_atomic_seg *aseg, struct ib_send_wr *wr) 1526 { 1527 if (wr->opcode == IB_WR_ATOMIC_CMP_AND_SWP) { 1528 aseg->swap_add = cpu_to_be64(wr->wr.atomic.swap); 1529 aseg->compare = cpu_to_be64(wr->wr.atomic.compare_add); 1530 } else if (wr->opcode == IB_WR_MASKED_ATOMIC_FETCH_AND_ADD) { 1531 aseg->swap_add = cpu_to_be64(wr->wr.atomic.compare_add); 1532 aseg->compare = cpu_to_be64(wr->wr.atomic.compare_add_mask); 1533 } else { 1534 aseg->swap_add = cpu_to_be64(wr->wr.atomic.compare_add); 1535 aseg->compare = 0; 1536 } 1537 1538 } 1539 1540 static void set_masked_atomic_seg(struct mlx4_wqe_masked_atomic_seg *aseg, 1541 struct ib_send_wr *wr) 1542 { 1543 aseg->swap_add = cpu_to_be64(wr->wr.atomic.swap); 1544 aseg->swap_add_mask = cpu_to_be64(wr->wr.atomic.swap_mask); 1545 aseg->compare = cpu_to_be64(wr->wr.atomic.compare_add); 1546 aseg->compare_mask = cpu_to_be64(wr->wr.atomic.compare_add_mask); 1547 } 1548 1549 static void set_datagram_seg(struct mlx4_wqe_datagram_seg *dseg, 1550 struct ib_send_wr *wr, __be16 *vlan) 1551 { 1552 memcpy(dseg->av, &to_mah(wr->wr.ud.ah)->av, sizeof (struct mlx4_av)); 1553 dseg->dqpn = cpu_to_be32(wr->wr.ud.remote_qpn); 1554 dseg->qkey = cpu_to_be32(wr->wr.ud.remote_qkey); 1555 dseg->vlan = to_mah(wr->wr.ud.ah)->av.eth.vlan; 1556 memcpy(dseg->mac, to_mah(wr->wr.ud.ah)->av.eth.mac, 6); 1557 *vlan = dseg->vlan; 1558 } 1559 1560 static void set_mlx_icrc_seg(void *dseg) 1561 { 1562 u32 *t = dseg; 1563 struct mlx4_wqe_inline_seg *iseg = dseg; 1564 1565 t[1] = 0; 1566 1567 /* 1568 * Need a barrier here before writing the byte_count field to 1569 * make sure that all the data is visible before the 1570 * byte_count field is set. Otherwise, if the segment begins 1571 * a new cacheline, the HCA prefetcher could grab the 64-byte 1572 * chunk and get a valid (!= * 0xffffffff) byte count but 1573 * stale data, and end up sending the wrong data. 1574 */ 1575 wmb(); 1576 1577 iseg->byte_count = cpu_to_be32((1 << 31) | 4); 1578 } 1579 1580 static void set_data_seg(struct mlx4_wqe_data_seg *dseg, struct ib_sge *sg) 1581 { 1582 dseg->lkey = cpu_to_be32(sg->lkey); 1583 dseg->addr = cpu_to_be64(sg->addr); 1584 1585 /* 1586 * Need a barrier here before writing the byte_count field to 1587 * make sure that all the data is visible before the 1588 * byte_count field is set. Otherwise, if the segment begins 1589 * a new cacheline, the HCA prefetcher could grab the 64-byte 1590 * chunk and get a valid (!= * 0xffffffff) byte count but 1591 * stale data, and end up sending the wrong data. 1592 */ 1593 wmb(); 1594 1595 dseg->byte_count = cpu_to_be32(sg->length); 1596 } 1597 1598 static void __set_data_seg(struct mlx4_wqe_data_seg *dseg, struct ib_sge *sg) 1599 { 1600 dseg->byte_count = cpu_to_be32(sg->length); 1601 dseg->lkey = cpu_to_be32(sg->lkey); 1602 dseg->addr = cpu_to_be64(sg->addr); 1603 } 1604 1605 static int build_lso_seg(struct mlx4_wqe_lso_seg *wqe, struct ib_send_wr *wr, 1606 struct mlx4_ib_qp *qp, unsigned *lso_seg_len, 1607 __be32 *lso_hdr_sz, __be32 *blh) 1608 { 1609 unsigned halign = ALIGN(sizeof *wqe + wr->wr.ud.hlen, 16); 1610 1611 if (unlikely(halign > MLX4_IB_CACHE_LINE_SIZE)) 1612 *blh = cpu_to_be32(1 << 6); 1613 1614 if (unlikely(!(qp->flags & MLX4_IB_QP_LSO) && 1615 wr->num_sge > qp->sq.max_gs - (halign >> 4))) 1616 return -EINVAL; 1617 1618 memcpy(wqe->header, wr->wr.ud.header, wr->wr.ud.hlen); 1619 1620 *lso_hdr_sz = cpu_to_be32((wr->wr.ud.mss - wr->wr.ud.hlen) << 16 | 1621 wr->wr.ud.hlen); 1622 *lso_seg_len = halign; 1623 return 0; 1624 } 1625 1626 static __be32 send_ieth(struct ib_send_wr *wr) 1627 { 1628 switch (wr->opcode) { 1629 case IB_WR_SEND_WITH_IMM: 1630 case IB_WR_RDMA_WRITE_WITH_IMM: 1631 return wr->ex.imm_data; 1632 1633 case IB_WR_SEND_WITH_INV: 1634 return cpu_to_be32(wr->ex.invalidate_rkey); 1635 1636 default: 1637 return 0; 1638 } 1639 } 1640 1641 int mlx4_ib_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr, 1642 struct ib_send_wr **bad_wr) 1643 { 1644 struct mlx4_ib_qp *qp = to_mqp(ibqp); 1645 void *wqe; 1646 struct mlx4_wqe_ctrl_seg *ctrl; 1647 struct mlx4_wqe_data_seg *dseg; 1648 unsigned long flags; 1649 int nreq; 1650 int err = 0; 1651 unsigned ind; 1652 int uninitialized_var(stamp); 1653 int uninitialized_var(size); 1654 unsigned uninitialized_var(seglen); 1655 __be32 dummy; 1656 __be32 *lso_wqe; 1657 __be32 uninitialized_var(lso_hdr_sz); 1658 __be32 blh; 1659 int i; 1660 __be16 vlan = cpu_to_be16(0xffff); 1661 1662 spin_lock_irqsave(&qp->sq.lock, flags); 1663 1664 ind = qp->sq_next_wqe; 1665 1666 for (nreq = 0; wr; ++nreq, wr = wr->next) { 1667 lso_wqe = &dummy; 1668 blh = 0; 1669 1670 if (mlx4_wq_overflow(&qp->sq, nreq, qp->ibqp.send_cq)) { 1671 err = -ENOMEM; 1672 *bad_wr = wr; 1673 goto out; 1674 } 1675 1676 if (unlikely(wr->num_sge > qp->sq.max_gs)) { 1677 err = -EINVAL; 1678 *bad_wr = wr; 1679 goto out; 1680 } 1681 1682 ctrl = wqe = get_send_wqe(qp, ind & (qp->sq.wqe_cnt - 1)); 1683 qp->sq.wrid[(qp->sq.head + nreq) & (qp->sq.wqe_cnt - 1)] = wr->wr_id; 1684 1685 ctrl->srcrb_flags = 1686 (wr->send_flags & IB_SEND_SIGNALED ? 1687 cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE) : 0) | 1688 (wr->send_flags & IB_SEND_SOLICITED ? 1689 cpu_to_be32(MLX4_WQE_CTRL_SOLICITED) : 0) | 1690 ((wr->send_flags & IB_SEND_IP_CSUM) ? 1691 cpu_to_be32(MLX4_WQE_CTRL_IP_CSUM | 1692 MLX4_WQE_CTRL_TCP_UDP_CSUM) : 0) | 1693 qp->sq_signal_bits; 1694 1695 ctrl->imm = send_ieth(wr); 1696 1697 wqe += sizeof *ctrl; 1698 size = sizeof *ctrl / 16; 1699 1700 switch (ibqp->qp_type) { 1701 case IB_QPT_RC: 1702 case IB_QPT_UC: 1703 switch (wr->opcode) { 1704 case IB_WR_ATOMIC_CMP_AND_SWP: 1705 case IB_WR_ATOMIC_FETCH_AND_ADD: 1706 case IB_WR_MASKED_ATOMIC_FETCH_AND_ADD: 1707 set_raddr_seg(wqe, wr->wr.atomic.remote_addr, 1708 wr->wr.atomic.rkey); 1709 wqe += sizeof (struct mlx4_wqe_raddr_seg); 1710 1711 set_atomic_seg(wqe, wr); 1712 wqe += sizeof (struct mlx4_wqe_atomic_seg); 1713 1714 size += (sizeof (struct mlx4_wqe_raddr_seg) + 1715 sizeof (struct mlx4_wqe_atomic_seg)) / 16; 1716 1717 break; 1718 1719 case IB_WR_MASKED_ATOMIC_CMP_AND_SWP: 1720 set_raddr_seg(wqe, wr->wr.atomic.remote_addr, 1721 wr->wr.atomic.rkey); 1722 wqe += sizeof (struct mlx4_wqe_raddr_seg); 1723 1724 set_masked_atomic_seg(wqe, wr); 1725 wqe += sizeof (struct mlx4_wqe_masked_atomic_seg); 1726 1727 size += (sizeof (struct mlx4_wqe_raddr_seg) + 1728 sizeof (struct mlx4_wqe_masked_atomic_seg)) / 16; 1729 1730 break; 1731 1732 case IB_WR_RDMA_READ: 1733 case IB_WR_RDMA_WRITE: 1734 case IB_WR_RDMA_WRITE_WITH_IMM: 1735 set_raddr_seg(wqe, wr->wr.rdma.remote_addr, 1736 wr->wr.rdma.rkey); 1737 wqe += sizeof (struct mlx4_wqe_raddr_seg); 1738 size += sizeof (struct mlx4_wqe_raddr_seg) / 16; 1739 break; 1740 1741 case IB_WR_LOCAL_INV: 1742 ctrl->srcrb_flags |= 1743 cpu_to_be32(MLX4_WQE_CTRL_STRONG_ORDER); 1744 set_local_inv_seg(wqe, wr->ex.invalidate_rkey); 1745 wqe += sizeof (struct mlx4_wqe_local_inval_seg); 1746 size += sizeof (struct mlx4_wqe_local_inval_seg) / 16; 1747 break; 1748 1749 case IB_WR_FAST_REG_MR: 1750 ctrl->srcrb_flags |= 1751 cpu_to_be32(MLX4_WQE_CTRL_STRONG_ORDER); 1752 set_fmr_seg(wqe, wr); 1753 wqe += sizeof (struct mlx4_wqe_fmr_seg); 1754 size += sizeof (struct mlx4_wqe_fmr_seg) / 16; 1755 break; 1756 1757 default: 1758 /* No extra segments required for sends */ 1759 break; 1760 } 1761 break; 1762 1763 case IB_QPT_UD: 1764 set_datagram_seg(wqe, wr, &vlan); 1765 wqe += sizeof (struct mlx4_wqe_datagram_seg); 1766 size += sizeof (struct mlx4_wqe_datagram_seg) / 16; 1767 1768 if (wr->opcode == IB_WR_LSO) { 1769 err = build_lso_seg(wqe, wr, qp, &seglen, &lso_hdr_sz, &blh); 1770 if (unlikely(err)) { 1771 *bad_wr = wr; 1772 goto out; 1773 } 1774 lso_wqe = (__be32 *) wqe; 1775 wqe += seglen; 1776 size += seglen / 16; 1777 } 1778 break; 1779 1780 case IB_QPT_SMI: 1781 case IB_QPT_GSI: 1782 err = build_mlx_header(to_msqp(qp), wr, ctrl, &seglen); 1783 if (unlikely(err)) { 1784 *bad_wr = wr; 1785 goto out; 1786 } 1787 wqe += seglen; 1788 size += seglen / 16; 1789 break; 1790 1791 default: 1792 break; 1793 } 1794 1795 /* 1796 * Write data segments in reverse order, so as to 1797 * overwrite cacheline stamp last within each 1798 * cacheline. This avoids issues with WQE 1799 * prefetching. 1800 */ 1801 1802 dseg = wqe; 1803 dseg += wr->num_sge - 1; 1804 size += wr->num_sge * (sizeof (struct mlx4_wqe_data_seg) / 16); 1805 1806 /* Add one more inline data segment for ICRC for MLX sends */ 1807 if (unlikely(qp->ibqp.qp_type == IB_QPT_SMI || 1808 qp->ibqp.qp_type == IB_QPT_GSI)) { 1809 set_mlx_icrc_seg(dseg + 1); 1810 size += sizeof (struct mlx4_wqe_data_seg) / 16; 1811 } 1812 1813 for (i = wr->num_sge - 1; i >= 0; --i, --dseg) 1814 set_data_seg(dseg, wr->sg_list + i); 1815 1816 /* 1817 * Possibly overwrite stamping in cacheline with LSO 1818 * segment only after making sure all data segments 1819 * are written. 1820 */ 1821 wmb(); 1822 *lso_wqe = lso_hdr_sz; 1823 1824 ctrl->fence_size = (wr->send_flags & IB_SEND_FENCE ? 1825 MLX4_WQE_CTRL_FENCE : 0) | size; 1826 1827 if (be16_to_cpu(vlan) < 0x1000) { 1828 ctrl->ins_vlan = 1 << 6; 1829 ctrl->vlan_tag = vlan; 1830 } 1831 1832 /* 1833 * Make sure descriptor is fully written before 1834 * setting ownership bit (because HW can start 1835 * executing as soon as we do). 1836 */ 1837 wmb(); 1838 1839 if (wr->opcode < 0 || wr->opcode >= ARRAY_SIZE(mlx4_ib_opcode)) { 1840 err = -EINVAL; 1841 goto out; 1842 } 1843 1844 ctrl->owner_opcode = mlx4_ib_opcode[wr->opcode] | 1845 (ind & qp->sq.wqe_cnt ? cpu_to_be32(1 << 31) : 0) | blh; 1846 1847 stamp = ind + qp->sq_spare_wqes; 1848 ind += DIV_ROUND_UP(size * 16, 1U << qp->sq.wqe_shift); 1849 1850 /* 1851 * We can improve latency by not stamping the last 1852 * send queue WQE until after ringing the doorbell, so 1853 * only stamp here if there are still more WQEs to post. 1854 * 1855 * Same optimization applies to padding with NOP wqe 1856 * in case of WQE shrinking (used to prevent wrap-around 1857 * in the middle of WR). 1858 */ 1859 if (wr->next) { 1860 stamp_send_wqe(qp, stamp, size * 16); 1861 ind = pad_wraparound(qp, ind); 1862 } 1863 } 1864 1865 out: 1866 if (likely(nreq)) { 1867 qp->sq.head += nreq; 1868 1869 /* 1870 * Make sure that descriptors are written before 1871 * doorbell record. 1872 */ 1873 wmb(); 1874 1875 writel(qp->doorbell_qpn, 1876 to_mdev(ibqp->device)->uar_map + MLX4_SEND_DOORBELL); 1877 1878 /* 1879 * Make sure doorbells don't leak out of SQ spinlock 1880 * and reach the HCA out of order. 1881 */ 1882 mmiowb(); 1883 1884 stamp_send_wqe(qp, stamp, size * 16); 1885 1886 ind = pad_wraparound(qp, ind); 1887 qp->sq_next_wqe = ind; 1888 } 1889 1890 spin_unlock_irqrestore(&qp->sq.lock, flags); 1891 1892 return err; 1893 } 1894 1895 int mlx4_ib_post_recv(struct ib_qp *ibqp, struct ib_recv_wr *wr, 1896 struct ib_recv_wr **bad_wr) 1897 { 1898 struct mlx4_ib_qp *qp = to_mqp(ibqp); 1899 struct mlx4_wqe_data_seg *scat; 1900 unsigned long flags; 1901 int err = 0; 1902 int nreq; 1903 int ind; 1904 int i; 1905 1906 spin_lock_irqsave(&qp->rq.lock, flags); 1907 1908 ind = qp->rq.head & (qp->rq.wqe_cnt - 1); 1909 1910 for (nreq = 0; wr; ++nreq, wr = wr->next) { 1911 if (mlx4_wq_overflow(&qp->rq, nreq, qp->ibqp.recv_cq)) { 1912 err = -ENOMEM; 1913 *bad_wr = wr; 1914 goto out; 1915 } 1916 1917 if (unlikely(wr->num_sge > qp->rq.max_gs)) { 1918 err = -EINVAL; 1919 *bad_wr = wr; 1920 goto out; 1921 } 1922 1923 scat = get_recv_wqe(qp, ind); 1924 1925 for (i = 0; i < wr->num_sge; ++i) 1926 __set_data_seg(scat + i, wr->sg_list + i); 1927 1928 if (i < qp->rq.max_gs) { 1929 scat[i].byte_count = 0; 1930 scat[i].lkey = cpu_to_be32(MLX4_INVALID_LKEY); 1931 scat[i].addr = 0; 1932 } 1933 1934 qp->rq.wrid[ind] = wr->wr_id; 1935 1936 ind = (ind + 1) & (qp->rq.wqe_cnt - 1); 1937 } 1938 1939 out: 1940 if (likely(nreq)) { 1941 qp->rq.head += nreq; 1942 1943 /* 1944 * Make sure that descriptors are written before 1945 * doorbell record. 1946 */ 1947 wmb(); 1948 1949 *qp->db.db = cpu_to_be32(qp->rq.head & 0xffff); 1950 } 1951 1952 spin_unlock_irqrestore(&qp->rq.lock, flags); 1953 1954 return err; 1955 } 1956 1957 static inline enum ib_qp_state to_ib_qp_state(enum mlx4_qp_state mlx4_state) 1958 { 1959 switch (mlx4_state) { 1960 case MLX4_QP_STATE_RST: return IB_QPS_RESET; 1961 case MLX4_QP_STATE_INIT: return IB_QPS_INIT; 1962 case MLX4_QP_STATE_RTR: return IB_QPS_RTR; 1963 case MLX4_QP_STATE_RTS: return IB_QPS_RTS; 1964 case MLX4_QP_STATE_SQ_DRAINING: 1965 case MLX4_QP_STATE_SQD: return IB_QPS_SQD; 1966 case MLX4_QP_STATE_SQER: return IB_QPS_SQE; 1967 case MLX4_QP_STATE_ERR: return IB_QPS_ERR; 1968 default: return -1; 1969 } 1970 } 1971 1972 static inline enum ib_mig_state to_ib_mig_state(int mlx4_mig_state) 1973 { 1974 switch (mlx4_mig_state) { 1975 case MLX4_QP_PM_ARMED: return IB_MIG_ARMED; 1976 case MLX4_QP_PM_REARM: return IB_MIG_REARM; 1977 case MLX4_QP_PM_MIGRATED: return IB_MIG_MIGRATED; 1978 default: return -1; 1979 } 1980 } 1981 1982 static int to_ib_qp_access_flags(int mlx4_flags) 1983 { 1984 int ib_flags = 0; 1985 1986 if (mlx4_flags & MLX4_QP_BIT_RRE) 1987 ib_flags |= IB_ACCESS_REMOTE_READ; 1988 if (mlx4_flags & MLX4_QP_BIT_RWE) 1989 ib_flags |= IB_ACCESS_REMOTE_WRITE; 1990 if (mlx4_flags & MLX4_QP_BIT_RAE) 1991 ib_flags |= IB_ACCESS_REMOTE_ATOMIC; 1992 1993 return ib_flags; 1994 } 1995 1996 static void to_ib_ah_attr(struct mlx4_ib_dev *ibdev, struct ib_ah_attr *ib_ah_attr, 1997 struct mlx4_qp_path *path) 1998 { 1999 struct mlx4_dev *dev = ibdev->dev; 2000 int is_eth; 2001 2002 memset(ib_ah_attr, 0, sizeof *ib_ah_attr); 2003 ib_ah_attr->port_num = path->sched_queue & 0x40 ? 2 : 1; 2004 2005 if (ib_ah_attr->port_num == 0 || ib_ah_attr->port_num > dev->caps.num_ports) 2006 return; 2007 2008 is_eth = rdma_port_get_link_layer(&ibdev->ib_dev, ib_ah_attr->port_num) == 2009 IB_LINK_LAYER_ETHERNET; 2010 if (is_eth) 2011 ib_ah_attr->sl = ((path->sched_queue >> 3) & 0x7) | 2012 ((path->sched_queue & 4) << 1); 2013 else 2014 ib_ah_attr->sl = (path->sched_queue >> 2) & 0xf; 2015 2016 ib_ah_attr->dlid = be16_to_cpu(path->rlid); 2017 ib_ah_attr->src_path_bits = path->grh_mylmc & 0x7f; 2018 ib_ah_attr->static_rate = path->static_rate ? path->static_rate - 5 : 0; 2019 ib_ah_attr->ah_flags = (path->grh_mylmc & (1 << 7)) ? IB_AH_GRH : 0; 2020 if (ib_ah_attr->ah_flags) { 2021 ib_ah_attr->grh.sgid_index = path->mgid_index; 2022 ib_ah_attr->grh.hop_limit = path->hop_limit; 2023 ib_ah_attr->grh.traffic_class = 2024 (be32_to_cpu(path->tclass_flowlabel) >> 20) & 0xff; 2025 ib_ah_attr->grh.flow_label = 2026 be32_to_cpu(path->tclass_flowlabel) & 0xfffff; 2027 memcpy(ib_ah_attr->grh.dgid.raw, 2028 path->rgid, sizeof ib_ah_attr->grh.dgid.raw); 2029 } 2030 } 2031 2032 int mlx4_ib_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *qp_attr, int qp_attr_mask, 2033 struct ib_qp_init_attr *qp_init_attr) 2034 { 2035 struct mlx4_ib_dev *dev = to_mdev(ibqp->device); 2036 struct mlx4_ib_qp *qp = to_mqp(ibqp); 2037 struct mlx4_qp_context context; 2038 int mlx4_state; 2039 int err = 0; 2040 2041 mutex_lock(&qp->mutex); 2042 2043 if (qp->state == IB_QPS_RESET) { 2044 qp_attr->qp_state = IB_QPS_RESET; 2045 goto done; 2046 } 2047 2048 err = mlx4_qp_query(dev->dev, &qp->mqp, &context); 2049 if (err) { 2050 err = -EINVAL; 2051 goto out; 2052 } 2053 2054 mlx4_state = be32_to_cpu(context.flags) >> 28; 2055 2056 qp->state = to_ib_qp_state(mlx4_state); 2057 qp_attr->qp_state = qp->state; 2058 qp_attr->path_mtu = context.mtu_msgmax >> 5; 2059 qp_attr->path_mig_state = 2060 to_ib_mig_state((be32_to_cpu(context.flags) >> 11) & 0x3); 2061 qp_attr->qkey = be32_to_cpu(context.qkey); 2062 qp_attr->rq_psn = be32_to_cpu(context.rnr_nextrecvpsn) & 0xffffff; 2063 qp_attr->sq_psn = be32_to_cpu(context.next_send_psn) & 0xffffff; 2064 qp_attr->dest_qp_num = be32_to_cpu(context.remote_qpn) & 0xffffff; 2065 qp_attr->qp_access_flags = 2066 to_ib_qp_access_flags(be32_to_cpu(context.params2)); 2067 2068 if (qp->ibqp.qp_type == IB_QPT_RC || qp->ibqp.qp_type == IB_QPT_UC) { 2069 to_ib_ah_attr(dev, &qp_attr->ah_attr, &context.pri_path); 2070 to_ib_ah_attr(dev, &qp_attr->alt_ah_attr, &context.alt_path); 2071 qp_attr->alt_pkey_index = context.alt_path.pkey_index & 0x7f; 2072 qp_attr->alt_port_num = qp_attr->alt_ah_attr.port_num; 2073 } 2074 2075 qp_attr->pkey_index = context.pri_path.pkey_index & 0x7f; 2076 if (qp_attr->qp_state == IB_QPS_INIT) 2077 qp_attr->port_num = qp->port; 2078 else 2079 qp_attr->port_num = context.pri_path.sched_queue & 0x40 ? 2 : 1; 2080 2081 /* qp_attr->en_sqd_async_notify is only applicable in modify qp */ 2082 qp_attr->sq_draining = mlx4_state == MLX4_QP_STATE_SQ_DRAINING; 2083 2084 qp_attr->max_rd_atomic = 1 << ((be32_to_cpu(context.params1) >> 21) & 0x7); 2085 2086 qp_attr->max_dest_rd_atomic = 2087 1 << ((be32_to_cpu(context.params2) >> 21) & 0x7); 2088 qp_attr->min_rnr_timer = 2089 (be32_to_cpu(context.rnr_nextrecvpsn) >> 24) & 0x1f; 2090 qp_attr->timeout = context.pri_path.ackto >> 3; 2091 qp_attr->retry_cnt = (be32_to_cpu(context.params1) >> 16) & 0x7; 2092 qp_attr->rnr_retry = (be32_to_cpu(context.params1) >> 13) & 0x7; 2093 qp_attr->alt_timeout = context.alt_path.ackto >> 3; 2094 2095 done: 2096 qp_attr->cur_qp_state = qp_attr->qp_state; 2097 qp_attr->cap.max_recv_wr = qp->rq.wqe_cnt; 2098 qp_attr->cap.max_recv_sge = qp->rq.max_gs; 2099 2100 if (!ibqp->uobject) { 2101 qp_attr->cap.max_send_wr = qp->sq.wqe_cnt; 2102 qp_attr->cap.max_send_sge = qp->sq.max_gs; 2103 } else { 2104 qp_attr->cap.max_send_wr = 0; 2105 qp_attr->cap.max_send_sge = 0; 2106 } 2107 2108 /* 2109 * We don't support inline sends for kernel QPs (yet), and we 2110 * don't know what userspace's value should be. 2111 */ 2112 qp_attr->cap.max_inline_data = 0; 2113 2114 qp_init_attr->cap = qp_attr->cap; 2115 2116 qp_init_attr->create_flags = 0; 2117 if (qp->flags & MLX4_IB_QP_BLOCK_MULTICAST_LOOPBACK) 2118 qp_init_attr->create_flags |= IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK; 2119 2120 if (qp->flags & MLX4_IB_QP_LSO) 2121 qp_init_attr->create_flags |= IB_QP_CREATE_IPOIB_UD_LSO; 2122 2123 out: 2124 mutex_unlock(&qp->mutex); 2125 return err; 2126 } 2127 2128