1 /* 2 * Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved. 3 * 4 * This software is available to you under a choice of one of two 5 * licenses. You may choose to be licensed under the terms of the GNU 6 * General Public License (GPL) Version 2, available from the file 7 * COPYING in the main directory of this source tree, or the 8 * OpenIB.org BSD license below: 9 * 10 * Redistribution and use in source and binary forms, with or 11 * without modification, are permitted provided that the following 12 * conditions are met: 13 * 14 * - Redistributions of source code must retain the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer. 17 * 18 * - Redistributions in binary form must reproduce the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer in the documentation and/or other materials 21 * provided with the distribution. 22 * 23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 30 * SOFTWARE. 31 */ 32 33 #include <linux/module.h> 34 #include <linux/mlx5/qp.h> 35 #include <linux/mlx5/srq.h> 36 #include <linux/slab.h> 37 #include <rdma/ib_umem.h> 38 #include <rdma/ib_user_verbs.h> 39 40 #include "mlx5_ib.h" 41 42 /* not supported currently */ 43 static int srq_signature; 44 45 static void *get_wqe(struct mlx5_ib_srq *srq, int n) 46 { 47 return mlx5_buf_offset(&srq->buf, n << srq->msrq.wqe_shift); 48 } 49 50 static void mlx5_ib_srq_event(struct mlx5_core_srq *srq, enum mlx5_event type) 51 { 52 struct ib_event event; 53 struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq; 54 55 if (ibsrq->event_handler) { 56 event.device = ibsrq->device; 57 event.element.srq = ibsrq; 58 switch (type) { 59 case MLX5_EVENT_TYPE_SRQ_RQ_LIMIT: 60 event.event = IB_EVENT_SRQ_LIMIT_REACHED; 61 break; 62 case MLX5_EVENT_TYPE_SRQ_CATAS_ERROR: 63 event.event = IB_EVENT_SRQ_ERR; 64 break; 65 default: 66 pr_warn("mlx5_ib: Unexpected event type %d on SRQ %06x\n", 67 type, srq->srqn); 68 return; 69 } 70 71 ibsrq->event_handler(&event, ibsrq->srq_context); 72 } 73 } 74 75 static int create_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq, 76 struct mlx5_srq_attr *in, 77 struct ib_udata *udata, int buf_size) 78 { 79 struct mlx5_ib_dev *dev = to_mdev(pd->device); 80 struct mlx5_ib_create_srq ucmd = {}; 81 size_t ucmdlen; 82 int err; 83 int npages; 84 int page_shift; 85 int ncont; 86 u32 offset; 87 u32 uidx = MLX5_IB_DEFAULT_UIDX; 88 89 ucmdlen = min(udata->inlen, sizeof(ucmd)); 90 91 if (ib_copy_from_udata(&ucmd, udata, ucmdlen)) { 92 mlx5_ib_dbg(dev, "failed copy udata\n"); 93 return -EFAULT; 94 } 95 96 if (ucmd.reserved0 || ucmd.reserved1) 97 return -EINVAL; 98 99 if (udata->inlen > sizeof(ucmd) && 100 !ib_is_udata_cleared(udata, sizeof(ucmd), 101 udata->inlen - sizeof(ucmd))) 102 return -EINVAL; 103 104 if (in->type != IB_SRQT_BASIC) { 105 err = get_srq_user_index(to_mucontext(pd->uobject->context), 106 &ucmd, udata->inlen, &uidx); 107 if (err) 108 return err; 109 } 110 111 srq->wq_sig = !!(ucmd.flags & MLX5_SRQ_FLAG_SIGNATURE); 112 113 srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr, buf_size, 114 0, 0); 115 if (IS_ERR(srq->umem)) { 116 mlx5_ib_dbg(dev, "failed umem get, size %d\n", buf_size); 117 err = PTR_ERR(srq->umem); 118 return err; 119 } 120 121 mlx5_ib_cont_pages(srq->umem, ucmd.buf_addr, 0, &npages, 122 &page_shift, &ncont, NULL); 123 err = mlx5_ib_get_buf_offset(ucmd.buf_addr, page_shift, 124 &offset); 125 if (err) { 126 mlx5_ib_warn(dev, "bad offset\n"); 127 goto err_umem; 128 } 129 130 in->pas = kvcalloc(ncont, sizeof(*in->pas), GFP_KERNEL); 131 if (!in->pas) { 132 err = -ENOMEM; 133 goto err_umem; 134 } 135 136 mlx5_ib_populate_pas(dev, srq->umem, page_shift, in->pas, 0); 137 138 err = mlx5_ib_db_map_user(to_mucontext(pd->uobject->context), 139 ucmd.db_addr, &srq->db); 140 if (err) { 141 mlx5_ib_dbg(dev, "map doorbell failed\n"); 142 goto err_in; 143 } 144 145 in->log_page_size = page_shift - MLX5_ADAPTER_PAGE_SHIFT; 146 in->page_offset = offset; 147 in->uid = to_mpd(pd)->uid; 148 if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 && 149 in->type != IB_SRQT_BASIC) 150 in->user_index = uidx; 151 152 return 0; 153 154 err_in: 155 kvfree(in->pas); 156 157 err_umem: 158 ib_umem_release(srq->umem); 159 160 return err; 161 } 162 163 static int create_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq, 164 struct mlx5_srq_attr *in, int buf_size) 165 { 166 int err; 167 int i; 168 struct mlx5_wqe_srq_next_seg *next; 169 170 err = mlx5_db_alloc(dev->mdev, &srq->db); 171 if (err) { 172 mlx5_ib_warn(dev, "alloc dbell rec failed\n"); 173 return err; 174 } 175 176 if (mlx5_buf_alloc(dev->mdev, buf_size, &srq->buf)) { 177 mlx5_ib_dbg(dev, "buf alloc failed\n"); 178 err = -ENOMEM; 179 goto err_db; 180 } 181 182 srq->head = 0; 183 srq->tail = srq->msrq.max - 1; 184 srq->wqe_ctr = 0; 185 186 for (i = 0; i < srq->msrq.max; i++) { 187 next = get_wqe(srq, i); 188 next->next_wqe_index = 189 cpu_to_be16((i + 1) & (srq->msrq.max - 1)); 190 } 191 192 mlx5_ib_dbg(dev, "srq->buf.page_shift = %d\n", srq->buf.page_shift); 193 in->pas = kvcalloc(srq->buf.npages, sizeof(*in->pas), GFP_KERNEL); 194 if (!in->pas) { 195 err = -ENOMEM; 196 goto err_buf; 197 } 198 mlx5_fill_page_array(&srq->buf, in->pas); 199 200 srq->wrid = kvmalloc_array(srq->msrq.max, sizeof(u64), GFP_KERNEL); 201 if (!srq->wrid) { 202 err = -ENOMEM; 203 goto err_in; 204 } 205 srq->wq_sig = !!srq_signature; 206 207 in->log_page_size = srq->buf.page_shift - MLX5_ADAPTER_PAGE_SHIFT; 208 if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 && 209 in->type != IB_SRQT_BASIC) 210 in->user_index = MLX5_IB_DEFAULT_UIDX; 211 212 return 0; 213 214 err_in: 215 kvfree(in->pas); 216 217 err_buf: 218 mlx5_buf_free(dev->mdev, &srq->buf); 219 220 err_db: 221 mlx5_db_free(dev->mdev, &srq->db); 222 return err; 223 } 224 225 static void destroy_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq) 226 { 227 mlx5_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db); 228 ib_umem_release(srq->umem); 229 } 230 231 232 static void destroy_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq) 233 { 234 kvfree(srq->wrid); 235 mlx5_buf_free(dev->mdev, &srq->buf); 236 mlx5_db_free(dev->mdev, &srq->db); 237 } 238 239 struct ib_srq *mlx5_ib_create_srq(struct ib_pd *pd, 240 struct ib_srq_init_attr *init_attr, 241 struct ib_udata *udata) 242 { 243 struct mlx5_ib_dev *dev = to_mdev(pd->device); 244 struct mlx5_ib_srq *srq; 245 size_t desc_size; 246 size_t buf_size; 247 int err; 248 struct mlx5_srq_attr in = {0}; 249 __u32 max_srq_wqes = 1 << MLX5_CAP_GEN(dev->mdev, log_max_srq_sz); 250 251 /* Sanity check SRQ size before proceeding */ 252 if (init_attr->attr.max_wr >= max_srq_wqes) { 253 mlx5_ib_dbg(dev, "max_wr %d, cap %d\n", 254 init_attr->attr.max_wr, 255 max_srq_wqes); 256 return ERR_PTR(-EINVAL); 257 } 258 259 srq = kmalloc(sizeof(*srq), GFP_KERNEL); 260 if (!srq) 261 return ERR_PTR(-ENOMEM); 262 263 mutex_init(&srq->mutex); 264 spin_lock_init(&srq->lock); 265 srq->msrq.max = roundup_pow_of_two(init_attr->attr.max_wr + 1); 266 srq->msrq.max_gs = init_attr->attr.max_sge; 267 268 desc_size = sizeof(struct mlx5_wqe_srq_next_seg) + 269 srq->msrq.max_gs * sizeof(struct mlx5_wqe_data_seg); 270 if (desc_size == 0 || srq->msrq.max_gs > desc_size) { 271 err = -EINVAL; 272 goto err_srq; 273 } 274 desc_size = roundup_pow_of_two(desc_size); 275 desc_size = max_t(size_t, 32, desc_size); 276 if (desc_size < sizeof(struct mlx5_wqe_srq_next_seg)) { 277 err = -EINVAL; 278 goto err_srq; 279 } 280 srq->msrq.max_avail_gather = (desc_size - sizeof(struct mlx5_wqe_srq_next_seg)) / 281 sizeof(struct mlx5_wqe_data_seg); 282 srq->msrq.wqe_shift = ilog2(desc_size); 283 buf_size = srq->msrq.max * desc_size; 284 if (buf_size < desc_size) { 285 err = -EINVAL; 286 goto err_srq; 287 } 288 in.type = init_attr->srq_type; 289 290 if (pd->uobject) 291 err = create_srq_user(pd, srq, &in, udata, buf_size); 292 else 293 err = create_srq_kernel(dev, srq, &in, buf_size); 294 295 if (err) { 296 mlx5_ib_warn(dev, "create srq %s failed, err %d\n", 297 pd->uobject ? "user" : "kernel", err); 298 goto err_srq; 299 } 300 301 in.log_size = ilog2(srq->msrq.max); 302 in.wqe_shift = srq->msrq.wqe_shift - 4; 303 if (srq->wq_sig) 304 in.flags |= MLX5_SRQ_FLAG_WQ_SIG; 305 306 if (init_attr->srq_type == IB_SRQT_XRC) 307 in.xrcd = to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn; 308 else 309 in.xrcd = to_mxrcd(dev->devr.x0)->xrcdn; 310 311 if (init_attr->srq_type == IB_SRQT_TM) { 312 in.tm_log_list_size = 313 ilog2(init_attr->ext.tag_matching.max_num_tags) + 1; 314 if (in.tm_log_list_size > 315 MLX5_CAP_GEN(dev->mdev, log_tag_matching_list_sz)) { 316 mlx5_ib_dbg(dev, "TM SRQ max_num_tags exceeding limit\n"); 317 err = -EINVAL; 318 goto err_usr_kern_srq; 319 } 320 in.flags |= MLX5_SRQ_FLAG_RNDV; 321 } 322 323 if (ib_srq_has_cq(init_attr->srq_type)) 324 in.cqn = to_mcq(init_attr->ext.cq)->mcq.cqn; 325 else 326 in.cqn = to_mcq(dev->devr.c0)->mcq.cqn; 327 328 in.pd = to_mpd(pd)->pdn; 329 in.db_record = srq->db.dma; 330 err = mlx5_core_create_srq(dev->mdev, &srq->msrq, &in); 331 kvfree(in.pas); 332 if (err) { 333 mlx5_ib_dbg(dev, "create SRQ failed, err %d\n", err); 334 goto err_usr_kern_srq; 335 } 336 337 mlx5_ib_dbg(dev, "create SRQ with srqn 0x%x\n", srq->msrq.srqn); 338 339 srq->msrq.event = mlx5_ib_srq_event; 340 srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn; 341 342 if (pd->uobject) 343 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof(__u32))) { 344 mlx5_ib_dbg(dev, "copy to user failed\n"); 345 err = -EFAULT; 346 goto err_core; 347 } 348 349 init_attr->attr.max_wr = srq->msrq.max - 1; 350 351 return &srq->ibsrq; 352 353 err_core: 354 mlx5_core_destroy_srq(dev->mdev, &srq->msrq); 355 356 err_usr_kern_srq: 357 if (pd->uobject) 358 destroy_srq_user(pd, srq); 359 else 360 destroy_srq_kernel(dev, srq); 361 362 err_srq: 363 kfree(srq); 364 365 return ERR_PTR(err); 366 } 367 368 int mlx5_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr, 369 enum ib_srq_attr_mask attr_mask, struct ib_udata *udata) 370 { 371 struct mlx5_ib_dev *dev = to_mdev(ibsrq->device); 372 struct mlx5_ib_srq *srq = to_msrq(ibsrq); 373 int ret; 374 375 /* We don't support resizing SRQs yet */ 376 if (attr_mask & IB_SRQ_MAX_WR) 377 return -EINVAL; 378 379 if (attr_mask & IB_SRQ_LIMIT) { 380 if (attr->srq_limit >= srq->msrq.max) 381 return -EINVAL; 382 383 mutex_lock(&srq->mutex); 384 ret = mlx5_core_arm_srq(dev->mdev, &srq->msrq, attr->srq_limit, 1); 385 mutex_unlock(&srq->mutex); 386 387 if (ret) 388 return ret; 389 } 390 391 return 0; 392 } 393 394 int mlx5_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr) 395 { 396 struct mlx5_ib_dev *dev = to_mdev(ibsrq->device); 397 struct mlx5_ib_srq *srq = to_msrq(ibsrq); 398 int ret; 399 struct mlx5_srq_attr *out; 400 401 out = kzalloc(sizeof(*out), GFP_KERNEL); 402 if (!out) 403 return -ENOMEM; 404 405 ret = mlx5_core_query_srq(dev->mdev, &srq->msrq, out); 406 if (ret) 407 goto out_box; 408 409 srq_attr->srq_limit = out->lwm; 410 srq_attr->max_wr = srq->msrq.max - 1; 411 srq_attr->max_sge = srq->msrq.max_gs; 412 413 out_box: 414 kfree(out); 415 return ret; 416 } 417 418 int mlx5_ib_destroy_srq(struct ib_srq *srq) 419 { 420 struct mlx5_ib_dev *dev = to_mdev(srq->device); 421 struct mlx5_ib_srq *msrq = to_msrq(srq); 422 423 mlx5_core_destroy_srq(dev->mdev, &msrq->msrq); 424 425 if (srq->uobject) { 426 mlx5_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db); 427 ib_umem_release(msrq->umem); 428 } else { 429 destroy_srq_kernel(dev, msrq); 430 } 431 432 kfree(srq); 433 return 0; 434 } 435 436 void mlx5_ib_free_srq_wqe(struct mlx5_ib_srq *srq, int wqe_index) 437 { 438 struct mlx5_wqe_srq_next_seg *next; 439 440 /* always called with interrupts disabled. */ 441 spin_lock(&srq->lock); 442 443 next = get_wqe(srq, srq->tail); 444 next->next_wqe_index = cpu_to_be16(wqe_index); 445 srq->tail = wqe_index; 446 447 spin_unlock(&srq->lock); 448 } 449 450 int mlx5_ib_post_srq_recv(struct ib_srq *ibsrq, const struct ib_recv_wr *wr, 451 const struct ib_recv_wr **bad_wr) 452 { 453 struct mlx5_ib_srq *srq = to_msrq(ibsrq); 454 struct mlx5_wqe_srq_next_seg *next; 455 struct mlx5_wqe_data_seg *scat; 456 struct mlx5_ib_dev *dev = to_mdev(ibsrq->device); 457 struct mlx5_core_dev *mdev = dev->mdev; 458 unsigned long flags; 459 int err = 0; 460 int nreq; 461 int i; 462 463 spin_lock_irqsave(&srq->lock, flags); 464 465 if (mdev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR) { 466 err = -EIO; 467 *bad_wr = wr; 468 goto out; 469 } 470 471 for (nreq = 0; wr; nreq++, wr = wr->next) { 472 if (unlikely(wr->num_sge > srq->msrq.max_gs)) { 473 err = -EINVAL; 474 *bad_wr = wr; 475 break; 476 } 477 478 if (unlikely(srq->head == srq->tail)) { 479 err = -ENOMEM; 480 *bad_wr = wr; 481 break; 482 } 483 484 srq->wrid[srq->head] = wr->wr_id; 485 486 next = get_wqe(srq, srq->head); 487 srq->head = be16_to_cpu(next->next_wqe_index); 488 scat = (struct mlx5_wqe_data_seg *)(next + 1); 489 490 for (i = 0; i < wr->num_sge; i++) { 491 scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length); 492 scat[i].lkey = cpu_to_be32(wr->sg_list[i].lkey); 493 scat[i].addr = cpu_to_be64(wr->sg_list[i].addr); 494 } 495 496 if (i < srq->msrq.max_avail_gather) { 497 scat[i].byte_count = 0; 498 scat[i].lkey = cpu_to_be32(MLX5_INVALID_LKEY); 499 scat[i].addr = 0; 500 } 501 } 502 503 if (likely(nreq)) { 504 srq->wqe_ctr += nreq; 505 506 /* Make sure that descriptors are written before 507 * doorbell record. 508 */ 509 wmb(); 510 511 *srq->db.db = cpu_to_be32(srq->wqe_ctr); 512 } 513 out: 514 spin_unlock_irqrestore(&srq->lock, flags); 515 516 return err; 517 } 518