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 #include "user.h" 42 43 /* not supported currently */ 44 static int srq_signature; 45 46 static void *get_wqe(struct mlx5_ib_srq *srq, int n) 47 { 48 return mlx5_buf_offset(&srq->buf, n << srq->msrq.wqe_shift); 49 } 50 51 static void mlx5_ib_srq_event(struct mlx5_core_srq *srq, enum mlx5_event type) 52 { 53 struct ib_event event; 54 struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq; 55 56 if (ibsrq->event_handler) { 57 event.device = ibsrq->device; 58 event.element.srq = ibsrq; 59 switch (type) { 60 case MLX5_EVENT_TYPE_SRQ_RQ_LIMIT: 61 event.event = IB_EVENT_SRQ_LIMIT_REACHED; 62 break; 63 case MLX5_EVENT_TYPE_SRQ_CATAS_ERROR: 64 event.event = IB_EVENT_SRQ_ERR; 65 break; 66 default: 67 pr_warn("mlx5_ib: Unexpected event type %d on SRQ %06x\n", 68 type, srq->srqn); 69 return; 70 } 71 72 ibsrq->event_handler(&event, ibsrq->srq_context); 73 } 74 } 75 76 static int create_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq, 77 struct mlx5_srq_attr *in, 78 struct ib_udata *udata, int buf_size) 79 { 80 struct mlx5_ib_dev *dev = to_mdev(pd->device); 81 struct mlx5_ib_create_srq ucmd = {}; 82 size_t ucmdlen; 83 int err; 84 int npages; 85 int page_shift; 86 int ncont; 87 u32 offset; 88 u32 uidx = MLX5_IB_DEFAULT_UIDX; 89 90 ucmdlen = min(udata->inlen, sizeof(ucmd)); 91 92 if (ib_copy_from_udata(&ucmd, udata, ucmdlen)) { 93 mlx5_ib_dbg(dev, "failed copy udata\n"); 94 return -EFAULT; 95 } 96 97 if (ucmd.reserved0 || ucmd.reserved1) 98 return -EINVAL; 99 100 if (udata->inlen > sizeof(ucmd) && 101 !ib_is_udata_cleared(udata, sizeof(ucmd), 102 udata->inlen - sizeof(ucmd))) 103 return -EINVAL; 104 105 if (in->type == IB_SRQT_XRC) { 106 err = get_srq_user_index(to_mucontext(pd->uobject->context), 107 &ucmd, udata->inlen, &uidx); 108 if (err) 109 return err; 110 } 111 112 srq->wq_sig = !!(ucmd.flags & MLX5_SRQ_FLAG_SIGNATURE); 113 114 srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr, buf_size, 115 0, 0); 116 if (IS_ERR(srq->umem)) { 117 mlx5_ib_dbg(dev, "failed umem get, size %d\n", buf_size); 118 err = PTR_ERR(srq->umem); 119 return err; 120 } 121 122 mlx5_ib_cont_pages(srq->umem, ucmd.buf_addr, &npages, 123 &page_shift, &ncont, NULL); 124 err = mlx5_ib_get_buf_offset(ucmd.buf_addr, page_shift, 125 &offset); 126 if (err) { 127 mlx5_ib_warn(dev, "bad offset\n"); 128 goto err_umem; 129 } 130 131 in->pas = mlx5_vzalloc(sizeof(*in->pas) * ncont); 132 if (!in->pas) { 133 err = -ENOMEM; 134 goto err_umem; 135 } 136 137 mlx5_ib_populate_pas(dev, srq->umem, page_shift, in->pas, 0); 138 139 err = mlx5_ib_db_map_user(to_mucontext(pd->uobject->context), 140 ucmd.db_addr, &srq->db); 141 if (err) { 142 mlx5_ib_dbg(dev, "map doorbell failed\n"); 143 goto err_in; 144 } 145 146 in->log_page_size = page_shift - MLX5_ADAPTER_PAGE_SHIFT; 147 in->page_offset = offset; 148 if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 && 149 in->type == IB_SRQT_XRC) 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 int page_shift; 170 int npages; 171 172 err = mlx5_db_alloc(dev->mdev, &srq->db); 173 if (err) { 174 mlx5_ib_warn(dev, "alloc dbell rec failed\n"); 175 return err; 176 } 177 178 if (mlx5_buf_alloc(dev->mdev, buf_size, &srq->buf)) { 179 mlx5_ib_dbg(dev, "buf alloc failed\n"); 180 err = -ENOMEM; 181 goto err_db; 182 } 183 page_shift = srq->buf.page_shift; 184 185 srq->head = 0; 186 srq->tail = srq->msrq.max - 1; 187 srq->wqe_ctr = 0; 188 189 for (i = 0; i < srq->msrq.max; i++) { 190 next = get_wqe(srq, i); 191 next->next_wqe_index = 192 cpu_to_be16((i + 1) & (srq->msrq.max - 1)); 193 } 194 195 npages = DIV_ROUND_UP(srq->buf.npages, 1 << (page_shift - PAGE_SHIFT)); 196 mlx5_ib_dbg(dev, "buf_size %d, page_shift %d, npages %d, calc npages %d\n", 197 buf_size, page_shift, srq->buf.npages, npages); 198 in->pas = mlx5_vzalloc(sizeof(*in->pas) * npages); 199 if (!in->pas) { 200 err = -ENOMEM; 201 goto err_buf; 202 } 203 mlx5_fill_page_array(&srq->buf, in->pas); 204 205 srq->wrid = kmalloc(srq->msrq.max * sizeof(u64), GFP_KERNEL); 206 if (!srq->wrid) { 207 mlx5_ib_dbg(dev, "kmalloc failed %lu\n", 208 (unsigned long)(srq->msrq.max * sizeof(u64))); 209 err = -ENOMEM; 210 goto err_in; 211 } 212 srq->wq_sig = !!srq_signature; 213 214 in->log_page_size = page_shift - MLX5_ADAPTER_PAGE_SHIFT; 215 if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 && 216 in->type == IB_SRQT_XRC) 217 in->user_index = MLX5_IB_DEFAULT_UIDX; 218 219 return 0; 220 221 err_in: 222 kvfree(in->pas); 223 224 err_buf: 225 mlx5_buf_free(dev->mdev, &srq->buf); 226 227 err_db: 228 mlx5_db_free(dev->mdev, &srq->db); 229 return err; 230 } 231 232 static void destroy_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq) 233 { 234 mlx5_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db); 235 ib_umem_release(srq->umem); 236 } 237 238 239 static void destroy_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq) 240 { 241 kfree(srq->wrid); 242 mlx5_buf_free(dev->mdev, &srq->buf); 243 mlx5_db_free(dev->mdev, &srq->db); 244 } 245 246 struct ib_srq *mlx5_ib_create_srq(struct ib_pd *pd, 247 struct ib_srq_init_attr *init_attr, 248 struct ib_udata *udata) 249 { 250 struct mlx5_ib_dev *dev = to_mdev(pd->device); 251 struct mlx5_ib_srq *srq; 252 int desc_size; 253 int buf_size; 254 int err; 255 struct mlx5_srq_attr in = {0}; 256 __u32 max_srq_wqes = 1 << MLX5_CAP_GEN(dev->mdev, log_max_srq_sz); 257 258 /* Sanity check SRQ size before proceeding */ 259 if (init_attr->attr.max_wr >= max_srq_wqes) { 260 mlx5_ib_dbg(dev, "max_wr %d, cap %d\n", 261 init_attr->attr.max_wr, 262 max_srq_wqes); 263 return ERR_PTR(-EINVAL); 264 } 265 266 srq = kmalloc(sizeof(*srq), GFP_KERNEL); 267 if (!srq) 268 return ERR_PTR(-ENOMEM); 269 270 mutex_init(&srq->mutex); 271 spin_lock_init(&srq->lock); 272 srq->msrq.max = roundup_pow_of_two(init_attr->attr.max_wr + 1); 273 srq->msrq.max_gs = init_attr->attr.max_sge; 274 275 desc_size = sizeof(struct mlx5_wqe_srq_next_seg) + 276 srq->msrq.max_gs * sizeof(struct mlx5_wqe_data_seg); 277 desc_size = roundup_pow_of_two(desc_size); 278 desc_size = max_t(int, 32, desc_size); 279 srq->msrq.max_avail_gather = (desc_size - sizeof(struct mlx5_wqe_srq_next_seg)) / 280 sizeof(struct mlx5_wqe_data_seg); 281 srq->msrq.wqe_shift = ilog2(desc_size); 282 buf_size = srq->msrq.max * desc_size; 283 mlx5_ib_dbg(dev, "desc_size 0x%x, req wr 0x%x, srq size 0x%x, max_gs 0x%x, max_avail_gather 0x%x\n", 284 desc_size, init_attr->attr.max_wr, srq->msrq.max, srq->msrq.max_gs, 285 srq->msrq.max_avail_gather); 286 287 if (pd->uobject) 288 err = create_srq_user(pd, srq, &in, udata, buf_size); 289 else 290 err = create_srq_kernel(dev, srq, &in, buf_size); 291 292 if (err) { 293 mlx5_ib_warn(dev, "create srq %s failed, err %d\n", 294 pd->uobject ? "user" : "kernel", err); 295 goto err_srq; 296 } 297 298 in.type = init_attr->srq_type; 299 in.log_size = ilog2(srq->msrq.max); 300 in.wqe_shift = srq->msrq.wqe_shift - 4; 301 if (srq->wq_sig) 302 in.flags |= MLX5_SRQ_FLAG_WQ_SIG; 303 if (init_attr->srq_type == IB_SRQT_XRC) { 304 in.xrcd = to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn; 305 in.cqn = to_mcq(init_attr->ext.xrc.cq)->mcq.cqn; 306 } else if (init_attr->srq_type == IB_SRQT_BASIC) { 307 in.xrcd = to_mxrcd(dev->devr.x0)->xrcdn; 308 in.cqn = to_mcq(dev->devr.c0)->mcq.cqn; 309 } 310 311 in.pd = to_mpd(pd)->pdn; 312 in.db_record = srq->db.dma; 313 err = mlx5_core_create_srq(dev->mdev, &srq->msrq, &in); 314 kvfree(in.pas); 315 if (err) { 316 mlx5_ib_dbg(dev, "create SRQ failed, err %d\n", err); 317 goto err_usr_kern_srq; 318 } 319 320 mlx5_ib_dbg(dev, "create SRQ with srqn 0x%x\n", srq->msrq.srqn); 321 322 srq->msrq.event = mlx5_ib_srq_event; 323 srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn; 324 325 if (pd->uobject) 326 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof(__u32))) { 327 mlx5_ib_dbg(dev, "copy to user failed\n"); 328 err = -EFAULT; 329 goto err_core; 330 } 331 332 init_attr->attr.max_wr = srq->msrq.max - 1; 333 334 return &srq->ibsrq; 335 336 err_core: 337 mlx5_core_destroy_srq(dev->mdev, &srq->msrq); 338 339 err_usr_kern_srq: 340 if (pd->uobject) 341 destroy_srq_user(pd, srq); 342 else 343 destroy_srq_kernel(dev, srq); 344 345 err_srq: 346 kfree(srq); 347 348 return ERR_PTR(err); 349 } 350 351 int mlx5_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr, 352 enum ib_srq_attr_mask attr_mask, struct ib_udata *udata) 353 { 354 struct mlx5_ib_dev *dev = to_mdev(ibsrq->device); 355 struct mlx5_ib_srq *srq = to_msrq(ibsrq); 356 int ret; 357 358 /* We don't support resizing SRQs yet */ 359 if (attr_mask & IB_SRQ_MAX_WR) 360 return -EINVAL; 361 362 if (attr_mask & IB_SRQ_LIMIT) { 363 if (attr->srq_limit >= srq->msrq.max) 364 return -EINVAL; 365 366 mutex_lock(&srq->mutex); 367 ret = mlx5_core_arm_srq(dev->mdev, &srq->msrq, attr->srq_limit, 1); 368 mutex_unlock(&srq->mutex); 369 370 if (ret) 371 return ret; 372 } 373 374 return 0; 375 } 376 377 int mlx5_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr) 378 { 379 struct mlx5_ib_dev *dev = to_mdev(ibsrq->device); 380 struct mlx5_ib_srq *srq = to_msrq(ibsrq); 381 int ret; 382 struct mlx5_srq_attr *out; 383 384 out = kzalloc(sizeof(*out), GFP_KERNEL); 385 if (!out) 386 return -ENOMEM; 387 388 ret = mlx5_core_query_srq(dev->mdev, &srq->msrq, out); 389 if (ret) 390 goto out_box; 391 392 srq_attr->srq_limit = out->lwm; 393 srq_attr->max_wr = srq->msrq.max - 1; 394 srq_attr->max_sge = srq->msrq.max_gs; 395 396 out_box: 397 kfree(out); 398 return ret; 399 } 400 401 int mlx5_ib_destroy_srq(struct ib_srq *srq) 402 { 403 struct mlx5_ib_dev *dev = to_mdev(srq->device); 404 struct mlx5_ib_srq *msrq = to_msrq(srq); 405 406 mlx5_core_destroy_srq(dev->mdev, &msrq->msrq); 407 408 if (srq->uobject) { 409 mlx5_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db); 410 ib_umem_release(msrq->umem); 411 } else { 412 destroy_srq_kernel(dev, msrq); 413 } 414 415 kfree(srq); 416 return 0; 417 } 418 419 void mlx5_ib_free_srq_wqe(struct mlx5_ib_srq *srq, int wqe_index) 420 { 421 struct mlx5_wqe_srq_next_seg *next; 422 423 /* always called with interrupts disabled. */ 424 spin_lock(&srq->lock); 425 426 next = get_wqe(srq, srq->tail); 427 next->next_wqe_index = cpu_to_be16(wqe_index); 428 srq->tail = wqe_index; 429 430 spin_unlock(&srq->lock); 431 } 432 433 int mlx5_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr, 434 struct ib_recv_wr **bad_wr) 435 { 436 struct mlx5_ib_srq *srq = to_msrq(ibsrq); 437 struct mlx5_wqe_srq_next_seg *next; 438 struct mlx5_wqe_data_seg *scat; 439 struct mlx5_ib_dev *dev = to_mdev(ibsrq->device); 440 struct mlx5_core_dev *mdev = dev->mdev; 441 unsigned long flags; 442 int err = 0; 443 int nreq; 444 int i; 445 446 spin_lock_irqsave(&srq->lock, flags); 447 448 if (mdev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR) { 449 err = -EIO; 450 *bad_wr = wr; 451 goto out; 452 } 453 454 for (nreq = 0; wr; nreq++, wr = wr->next) { 455 if (unlikely(wr->num_sge > srq->msrq.max_gs)) { 456 err = -EINVAL; 457 *bad_wr = wr; 458 break; 459 } 460 461 if (unlikely(srq->head == srq->tail)) { 462 err = -ENOMEM; 463 *bad_wr = wr; 464 break; 465 } 466 467 srq->wrid[srq->head] = wr->wr_id; 468 469 next = get_wqe(srq, srq->head); 470 srq->head = be16_to_cpu(next->next_wqe_index); 471 scat = (struct mlx5_wqe_data_seg *)(next + 1); 472 473 for (i = 0; i < wr->num_sge; i++) { 474 scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length); 475 scat[i].lkey = cpu_to_be32(wr->sg_list[i].lkey); 476 scat[i].addr = cpu_to_be64(wr->sg_list[i].addr); 477 } 478 479 if (i < srq->msrq.max_avail_gather) { 480 scat[i].byte_count = 0; 481 scat[i].lkey = cpu_to_be32(MLX5_INVALID_LKEY); 482 scat[i].addr = 0; 483 } 484 } 485 486 if (likely(nreq)) { 487 srq->wqe_ctr += nreq; 488 489 /* Make sure that descriptors are written before 490 * doorbell record. 491 */ 492 wmb(); 493 494 *srq->db.db = cpu_to_be32(srq->wqe_ctr); 495 } 496 out: 497 spin_unlock_irqrestore(&srq->lock, flags); 498 499 return err; 500 } 501