1 /*- 2 * Copyright (c) 2013-2015, Mellanox Technologies, Ltd. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS `AS IS' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 * 25 * $FreeBSD$ 26 */ 27 28 #include <linux/module.h> 29 #include <dev/mlx5/qp.h> 30 #include <dev/mlx5/srq.h> 31 #include <linux/slab.h> 32 #include <rdma/ib_umem.h> 33 #include <rdma/ib_user_verbs.h> 34 35 #include "mlx5_ib.h" 36 37 /* not supported currently */ 38 static int srq_signature; 39 40 static void *get_wqe(struct mlx5_ib_srq *srq, int n) 41 { 42 return mlx5_buf_offset(&srq->buf, n << srq->msrq.wqe_shift); 43 } 44 45 static void mlx5_ib_srq_event(struct mlx5_core_srq *srq, int type) 46 { 47 struct ib_event event; 48 struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq; 49 50 if (ibsrq->event_handler) { 51 event.device = ibsrq->device; 52 event.element.srq = ibsrq; 53 switch (type) { 54 case MLX5_EVENT_TYPE_SRQ_RQ_LIMIT: 55 event.event = IB_EVENT_SRQ_LIMIT_REACHED; 56 break; 57 case MLX5_EVENT_TYPE_SRQ_CATAS_ERROR: 58 event.event = IB_EVENT_SRQ_ERR; 59 break; 60 default: 61 pr_warn("mlx5_ib: Unexpected event type %d on SRQ %06x\n", 62 type, srq->srqn); 63 return; 64 } 65 66 ibsrq->event_handler(&event, ibsrq->srq_context); 67 } 68 } 69 70 static int create_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq, 71 struct mlx5_srq_attr *in, 72 struct ib_udata *udata, int buf_size) 73 { 74 struct mlx5_ib_dev *dev = to_mdev(pd->device); 75 struct mlx5_ib_create_srq ucmd = {}; 76 size_t ucmdlen; 77 int err; 78 int npages; 79 int page_shift; 80 int ncont; 81 u32 offset; 82 u32 uidx = MLX5_IB_DEFAULT_UIDX; 83 84 ucmdlen = min(udata->inlen, sizeof(ucmd)); 85 86 if (ib_copy_from_udata(&ucmd, udata, ucmdlen)) { 87 mlx5_ib_dbg(dev, "failed copy udata\n"); 88 return -EFAULT; 89 } 90 91 if (ucmd.reserved0 || ucmd.reserved1) 92 return -EINVAL; 93 94 if (udata->inlen > sizeof(ucmd) && 95 !ib_is_udata_cleared(udata, sizeof(ucmd), 96 udata->inlen - sizeof(ucmd))) 97 return -EINVAL; 98 99 if (in->type == IB_SRQT_XRC) { 100 err = get_srq_user_index(to_mucontext(pd->uobject->context), 101 &ucmd, udata->inlen, &uidx); 102 if (err) 103 return err; 104 } 105 106 srq->wq_sig = !!(ucmd.flags & MLX5_SRQ_FLAG_SIGNATURE); 107 108 srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr, buf_size, 109 0, 0); 110 if (IS_ERR(srq->umem)) { 111 mlx5_ib_dbg(dev, "failed umem get, size %d\n", buf_size); 112 err = PTR_ERR(srq->umem); 113 return err; 114 } 115 116 mlx5_ib_cont_pages(srq->umem, ucmd.buf_addr, &npages, 117 &page_shift, &ncont, NULL); 118 err = mlx5_ib_get_buf_offset(ucmd.buf_addr, page_shift, 119 &offset); 120 if (err) { 121 mlx5_ib_warn(dev, "bad offset\n"); 122 goto err_umem; 123 } 124 125 in->pas = mlx5_vzalloc(sizeof(*in->pas) * ncont); 126 if (!in->pas) { 127 err = -ENOMEM; 128 goto err_umem; 129 } 130 131 mlx5_ib_populate_pas(dev, srq->umem, page_shift, in->pas, 0); 132 133 err = mlx5_ib_db_map_user(to_mucontext(pd->uobject->context), 134 ucmd.db_addr, &srq->db); 135 if (err) { 136 mlx5_ib_dbg(dev, "map doorbell failed\n"); 137 goto err_in; 138 } 139 140 in->log_page_size = page_shift - MLX5_ADAPTER_PAGE_SHIFT; 141 in->page_offset = offset; 142 if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 && 143 in->type == IB_SRQT_XRC) 144 in->user_index = uidx; 145 return 0; 146 147 err_in: 148 kvfree(in->pas); 149 150 err_umem: 151 ib_umem_release(srq->umem); 152 153 return err; 154 } 155 156 static int create_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq, 157 struct mlx5_srq_attr *in, int buf_size) 158 { 159 int err; 160 int i; 161 struct mlx5_wqe_srq_next_seg *next; 162 163 err = mlx5_db_alloc(dev->mdev, &srq->db); 164 if (err) { 165 mlx5_ib_warn(dev, "alloc dbell rec failed\n"); 166 return err; 167 } 168 169 if (mlx5_buf_alloc(dev->mdev, buf_size, 2 * PAGE_SIZE, &srq->buf)) { 170 mlx5_ib_dbg(dev, "buf alloc failed\n"); 171 err = -ENOMEM; 172 goto err_db; 173 } 174 175 srq->head = 0; 176 srq->tail = srq->msrq.max - 1; 177 srq->wqe_ctr = 0; 178 179 for (i = 0; i < srq->msrq.max; i++) { 180 next = get_wqe(srq, i); 181 next->next_wqe_index = 182 cpu_to_be16((i + 1) & (srq->msrq.max - 1)); 183 } 184 185 mlx5_ib_dbg(dev, "srq->buf.page_shift = %d\n", srq->buf.page_shift); 186 in->pas = mlx5_vzalloc(sizeof(*in->pas) * srq->buf.npages); 187 if (!in->pas) { 188 err = -ENOMEM; 189 goto err_buf; 190 } 191 mlx5_fill_page_array(&srq->buf, in->pas); 192 193 srq->wrid = kmalloc(srq->msrq.max * sizeof(u64), GFP_KERNEL); 194 if (!srq->wrid) { 195 mlx5_ib_dbg(dev, "kmalloc failed %lu\n", 196 (unsigned long)(srq->msrq.max * sizeof(u64))); 197 err = -ENOMEM; 198 goto err_in; 199 } 200 srq->wq_sig = !!srq_signature; 201 202 in->log_page_size = srq->buf.page_shift - MLX5_ADAPTER_PAGE_SHIFT; 203 if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 && 204 in->type == IB_SRQT_XRC) 205 in->user_index = MLX5_IB_DEFAULT_UIDX; 206 207 return 0; 208 209 err_in: 210 kvfree(in->pas); 211 212 err_buf: 213 mlx5_buf_free(dev->mdev, &srq->buf); 214 215 err_db: 216 mlx5_db_free(dev->mdev, &srq->db); 217 return err; 218 } 219 220 static void destroy_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq) 221 { 222 mlx5_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db); 223 ib_umem_release(srq->umem); 224 } 225 226 227 static void destroy_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq) 228 { 229 kfree(srq->wrid); 230 mlx5_buf_free(dev->mdev, &srq->buf); 231 mlx5_db_free(dev->mdev, &srq->db); 232 } 233 234 struct ib_srq *mlx5_ib_create_srq(struct ib_pd *pd, 235 struct ib_srq_init_attr *init_attr, 236 struct ib_udata *udata) 237 { 238 struct mlx5_ib_dev *dev = to_mdev(pd->device); 239 struct mlx5_ib_srq *srq; 240 size_t desc_size; 241 size_t buf_size; 242 int err; 243 struct mlx5_srq_attr in = {0}; 244 __u32 max_srq_wqes = 1 << MLX5_CAP_GEN(dev->mdev, log_max_srq_sz); 245 246 /* Sanity check SRQ size before proceeding */ 247 if (init_attr->attr.max_wr >= max_srq_wqes) { 248 mlx5_ib_dbg(dev, "max_wr %d, cap %d\n", 249 init_attr->attr.max_wr, 250 max_srq_wqes); 251 return ERR_PTR(-EINVAL); 252 } 253 254 srq = kmalloc(sizeof(*srq), GFP_KERNEL); 255 if (!srq) 256 return ERR_PTR(-ENOMEM); 257 258 mutex_init(&srq->mutex); 259 spin_lock_init(&srq->lock); 260 srq->msrq.max = roundup_pow_of_two(init_attr->attr.max_wr + 1); 261 srq->msrq.max_gs = init_attr->attr.max_sge; 262 263 desc_size = sizeof(struct mlx5_wqe_srq_next_seg) + 264 srq->msrq.max_gs * sizeof(struct mlx5_wqe_data_seg); 265 if (desc_size == 0 || srq->msrq.max_gs > desc_size) { 266 err = -EINVAL; 267 goto err_srq; 268 } 269 desc_size = roundup_pow_of_two(desc_size); 270 desc_size = max_t(size_t, 32, desc_size); 271 if (desc_size < sizeof(struct mlx5_wqe_srq_next_seg)) { 272 err = -EINVAL; 273 goto err_srq; 274 } 275 srq->msrq.max_avail_gather = (desc_size - sizeof(struct mlx5_wqe_srq_next_seg)) / 276 sizeof(struct mlx5_wqe_data_seg); 277 srq->msrq.wqe_shift = ilog2(desc_size); 278 buf_size = srq->msrq.max * desc_size; 279 if (buf_size < desc_size) { 280 err = -EINVAL; 281 goto err_srq; 282 } 283 in.type = init_attr->srq_type; 284 285 if (pd->uobject) 286 err = create_srq_user(pd, srq, &in, udata, buf_size); 287 else 288 err = create_srq_kernel(dev, srq, &in, buf_size); 289 290 if (err || !in.pas) { 291 mlx5_ib_warn(dev, "create srq %s failed, err %d\n", 292 pd->uobject ? "user" : "kernel", err); 293 goto err_srq; 294 } 295 296 in.log_size = ilog2(srq->msrq.max); 297 in.wqe_shift = srq->msrq.wqe_shift - 4; 298 if (srq->wq_sig) 299 in.flags |= MLX5_SRQ_FLAG_WQ_SIG; 300 if (init_attr->srq_type == IB_SRQT_XRC) { 301 in.xrcd = to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn; 302 in.cqn = to_mcq(init_attr->ext.xrc.cq)->mcq.cqn; 303 } else if (init_attr->srq_type == IB_SRQT_BASIC) { 304 in.xrcd = to_mxrcd(dev->devr.x0)->xrcdn; 305 in.cqn = to_mcq(dev->devr.c0)->mcq.cqn; 306 } 307 308 in.pd = to_mpd(pd)->pdn; 309 in.db_record = srq->db.dma; 310 err = mlx5_core_create_srq(dev->mdev, &srq->msrq, &in); 311 kvfree(in.pas); 312 if (err) { 313 mlx5_ib_dbg(dev, "create SRQ failed, err %d\n", err); 314 goto err_usr_kern_srq; 315 } 316 317 mlx5_ib_dbg(dev, "create SRQ with srqn 0x%x\n", srq->msrq.srqn); 318 319 srq->msrq.event = mlx5_ib_srq_event; 320 srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn; 321 322 if (pd->uobject) 323 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof(__u32))) { 324 mlx5_ib_dbg(dev, "copy to user failed\n"); 325 err = -EFAULT; 326 goto err_core; 327 } 328 329 init_attr->attr.max_wr = srq->msrq.max - 1; 330 331 return &srq->ibsrq; 332 333 err_core: 334 mlx5_core_destroy_srq(dev->mdev, &srq->msrq); 335 336 err_usr_kern_srq: 337 if (pd->uobject) 338 destroy_srq_user(pd, srq); 339 else 340 destroy_srq_kernel(dev, srq); 341 342 err_srq: 343 kfree(srq); 344 345 return ERR_PTR(err); 346 } 347 348 int mlx5_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr, 349 enum ib_srq_attr_mask attr_mask, struct ib_udata *udata) 350 { 351 struct mlx5_ib_dev *dev = to_mdev(ibsrq->device); 352 struct mlx5_ib_srq *srq = to_msrq(ibsrq); 353 int ret; 354 355 /* We don't support resizing SRQs yet */ 356 if (attr_mask & IB_SRQ_MAX_WR) 357 return -EINVAL; 358 359 if (attr_mask & IB_SRQ_LIMIT) { 360 if (attr->srq_limit >= srq->msrq.max) 361 return -EINVAL; 362 363 mutex_lock(&srq->mutex); 364 ret = mlx5_core_arm_srq(dev->mdev, &srq->msrq, attr->srq_limit, 1); 365 mutex_unlock(&srq->mutex); 366 367 if (ret) 368 return ret; 369 } 370 371 return 0; 372 } 373 374 int mlx5_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr) 375 { 376 struct mlx5_ib_dev *dev = to_mdev(ibsrq->device); 377 struct mlx5_ib_srq *srq = to_msrq(ibsrq); 378 int ret; 379 struct mlx5_srq_attr *out; 380 381 out = kzalloc(sizeof(*out), GFP_KERNEL); 382 if (!out) 383 return -ENOMEM; 384 385 ret = mlx5_core_query_srq(dev->mdev, &srq->msrq, out); 386 if (ret) 387 goto out_box; 388 389 srq_attr->srq_limit = out->lwm; 390 srq_attr->max_wr = srq->msrq.max - 1; 391 srq_attr->max_sge = srq->msrq.max_gs; 392 393 out_box: 394 kfree(out); 395 return ret; 396 } 397 398 int mlx5_ib_destroy_srq(struct ib_srq *srq) 399 { 400 struct mlx5_ib_dev *dev = to_mdev(srq->device); 401 struct mlx5_ib_srq *msrq = to_msrq(srq); 402 403 mlx5_core_destroy_srq(dev->mdev, &msrq->msrq); 404 405 if (srq->uobject) { 406 mlx5_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db); 407 ib_umem_release(msrq->umem); 408 } else { 409 destroy_srq_kernel(dev, msrq); 410 } 411 412 kfree(srq); 413 return 0; 414 } 415 416 void mlx5_ib_free_srq_wqe(struct mlx5_ib_srq *srq, int wqe_index) 417 { 418 struct mlx5_wqe_srq_next_seg *next; 419 420 /* always called with interrupts disabled. */ 421 spin_lock(&srq->lock); 422 423 next = get_wqe(srq, srq->tail); 424 next->next_wqe_index = cpu_to_be16(wqe_index); 425 srq->tail = wqe_index; 426 427 spin_unlock(&srq->lock); 428 } 429 430 int mlx5_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr, 431 struct ib_recv_wr **bad_wr) 432 { 433 struct mlx5_ib_srq *srq = to_msrq(ibsrq); 434 struct mlx5_wqe_srq_next_seg *next; 435 struct mlx5_wqe_data_seg *scat; 436 struct mlx5_ib_dev *dev = to_mdev(ibsrq->device); 437 struct mlx5_core_dev *mdev = dev->mdev; 438 unsigned long flags; 439 int err = 0; 440 int nreq; 441 int i; 442 443 spin_lock_irqsave(&srq->lock, flags); 444 445 if (mdev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR) { 446 err = -EIO; 447 *bad_wr = wr; 448 goto out; 449 } 450 451 for (nreq = 0; wr; nreq++, wr = wr->next) { 452 if (unlikely(wr->num_sge > srq->msrq.max_gs)) { 453 err = -EINVAL; 454 *bad_wr = wr; 455 break; 456 } 457 458 if (unlikely(srq->head == srq->tail)) { 459 err = -ENOMEM; 460 *bad_wr = wr; 461 break; 462 } 463 464 srq->wrid[srq->head] = wr->wr_id; 465 466 next = get_wqe(srq, srq->head); 467 srq->head = be16_to_cpu(next->next_wqe_index); 468 scat = (struct mlx5_wqe_data_seg *)(next + 1); 469 470 for (i = 0; i < wr->num_sge; i++) { 471 scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length); 472 scat[i].lkey = cpu_to_be32(wr->sg_list[i].lkey); 473 scat[i].addr = cpu_to_be64(wr->sg_list[i].addr); 474 } 475 476 if (i < srq->msrq.max_avail_gather) { 477 scat[i].byte_count = 0; 478 scat[i].lkey = cpu_to_be32(MLX5_INVALID_LKEY); 479 scat[i].addr = 0; 480 } 481 } 482 483 if (likely(nreq)) { 484 srq->wqe_ctr += nreq; 485 486 /* Make sure that descriptors are written before 487 * doorbell record. 488 */ 489 wmb(); 490 491 *srq->db.db = cpu_to_be32(srq->wqe_ctr); 492 } 493 out: 494 spin_unlock_irqrestore(&srq->lock, flags); 495 496 return err; 497 } 498