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: stable/10/sys/dev/mlx5/mlx5_ib/mlx5_ib_srq.c 322810 2017-08-23 12:09:37Z hselasky $ 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#include "user.h" 37 38/* not supported currently */ 39static int srq_signature; 40 41static void *get_wqe(struct mlx5_ib_srq *srq, int n) 42{ 43 return mlx5_buf_offset(&srq->buf, n << srq->msrq.wqe_shift); 44} 45 46static void mlx5_ib_srq_event(struct mlx5_core_srq *srq, int type) 47{ 48 struct ib_event event; 49 struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq; 50 51 if (ibsrq->event_handler) { 52 event.device = ibsrq->device; 53 event.element.srq = ibsrq; 54 switch (type) { 55 case MLX5_EVENT_TYPE_SRQ_RQ_LIMIT: 56 event.event = IB_EVENT_SRQ_LIMIT_REACHED; 57 break; 58 case MLX5_EVENT_TYPE_SRQ_CATAS_ERROR: 59 event.event = IB_EVENT_SRQ_ERR; 60 break; 61 default: 62 printf("mlx5_ib: WARN: ""mlx5_ib: Unexpected event type %d on SRQ %06x\n", type, srq->srqn); 63 return; 64 } 65 66 ibsrq->event_handler(&event, ibsrq->srq_context); 67 } 68} 69 70static int create_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq, 71 struct mlx5_create_srq_mbox_in **in, 72 struct ib_udata *udata, int buf_size, int *inlen) 73{ 74 struct mlx5_ib_dev *dev = to_mdev(pd->device); 75 struct mlx5_ib_create_srq ucmd; 76 size_t ucmdlen; 77 void *xsrqc; 78 int err; 79 int npages; 80 int page_shift; 81 int ncont; 82 int drv_data = udata->inlen - sizeof(struct ib_uverbs_cmd_hdr); 83 u32 offset; 84 85 ucmdlen = (drv_data < sizeof(ucmd)) ? 86 drv_data : sizeof(ucmd); 87 88 if (ib_copy_from_udata(&ucmd, udata, ucmdlen)) { 89 mlx5_ib_err(dev, "failed copy udata\n"); 90 return -EFAULT; 91 } 92 93 if (ucmdlen == sizeof(ucmd) && 94 ucmd.reserved1 != 0) { 95 mlx5_ib_warn(dev, "corrupted ucmd\n"); 96 return -EINVAL; 97 } 98 99 srq->wq_sig = !!(ucmd.flags & MLX5_SRQ_FLAG_SIGNATURE); 100 101 srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr, buf_size, 102 0, 0); 103 if (IS_ERR(srq->umem)) { 104 mlx5_ib_warn(dev, "failed umem get, size %d\n", buf_size); 105 err = PTR_ERR(srq->umem); 106 return err; 107 } 108 109 mlx5_ib_cont_pages(srq->umem, ucmd.buf_addr, &npages, 110 &page_shift, &ncont, NULL); 111 err = mlx5_ib_get_buf_offset(ucmd.buf_addr, page_shift, 112 &offset); 113 if (err) { 114 mlx5_ib_warn(dev, "bad offset\n"); 115 goto err_umem; 116 } 117 118 *inlen = sizeof(**in) + sizeof(*(*in)->pas) * ncont; 119 *in = mlx5_vzalloc(*inlen); 120 if (!(*in)) { 121 mlx5_ib_err(dev, "failed allocate mbox\n"); 122 err = -ENOMEM; 123 goto err_umem; 124 } 125 126 mlx5_ib_populate_pas(dev, srq->umem, page_shift, (*in)->pas, 0); 127 128 err = mlx5_ib_db_map_user(to_mucontext(pd->uobject->context), 129 ucmd.db_addr, &srq->db); 130 if (err) { 131 mlx5_ib_warn(dev, "map doorbell failed\n"); 132 goto err_in; 133 } 134 135 (*in)->ctx.log_pg_sz = page_shift - MLX5_ADAPTER_PAGE_SHIFT; 136 (*in)->ctx.pgoff_cqn = cpu_to_be32(offset << 26); 137 138 if (MLX5_CAP_GEN(dev->mdev, cqe_version)) { 139 xsrqc = MLX5_ADDR_OF(create_xrc_srq_in, *in, 140 xrc_srq_context_entry); 141 /* 0xffffff means we ask to work with cqe version 0 */ 142 if (drv_data > offsetof(struct mlx5_ib_create_srq, uidx)) 143 MLX5_SET(xrc_srqc, xsrqc, user_index, ucmd.uidx); 144 else 145 MLX5_SET(xrc_srqc, xsrqc, user_index, 0xffffff); 146 } 147 148 return 0; 149 150err_in: 151 kvfree(*in); 152 153err_umem: 154 ib_umem_release(srq->umem); 155 156 return err; 157} 158 159static int create_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq, 160 struct mlx5_create_srq_mbox_in **in, int buf_size, 161 int *inlen) 162{ 163 int err; 164 int i; 165 struct mlx5_wqe_srq_next_seg *next; 166 int page_shift; 167 void *xsrqc; 168 169 err = mlx5_db_alloc(dev->mdev, &srq->db); 170 if (err) { 171 mlx5_ib_warn(dev, "alloc dbell rec failed\n"); 172 return err; 173 } 174 175 if (mlx5_buf_alloc(dev->mdev, buf_size, PAGE_SIZE * 2, &srq->buf)) { 176 mlx5_ib_err(dev, "buf alloc failed\n"); 177 err = -ENOMEM; 178 goto err_db; 179 } 180 page_shift = srq->buf.page_shift; 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 *inlen = sizeof(**in) + sizeof(*(*in)->pas) * srq->buf.npages; 193 *in = mlx5_vzalloc(*inlen); 194 if (!*in) { 195 mlx5_ib_err(dev, "failed allocate mbox\n"); 196 err = -ENOMEM; 197 goto err_buf; 198 } 199 mlx5_fill_page_array(&srq->buf, (*in)->pas); 200 201 srq->wrid = kmalloc(srq->msrq.max * sizeof(u64), GFP_KERNEL); 202 if (!srq->wrid) { 203 err = -ENOMEM; 204 goto err_in; 205 } 206 srq->wq_sig = !!srq_signature; 207 208 (*in)->ctx.log_pg_sz = page_shift - MLX5_ADAPTER_PAGE_SHIFT; 209 210 if (MLX5_CAP_GEN(dev->mdev, cqe_version)) { 211 xsrqc = MLX5_ADDR_OF(create_xrc_srq_in, *in, 212 xrc_srq_context_entry); 213 /* 0xffffff means we ask to work with cqe version 0 */ 214 MLX5_SET(xrc_srqc, xsrqc, user_index, 0xffffff); 215 } 216 217 return 0; 218 219err_in: 220 kvfree(*in); 221 222err_buf: 223 mlx5_buf_free(dev->mdev, &srq->buf); 224 225err_db: 226 mlx5_db_free(dev->mdev, &srq->db); 227 return err; 228} 229 230static void destroy_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq) 231{ 232 mlx5_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db); 233 ib_umem_release(srq->umem); 234} 235 236 237static void destroy_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq) 238{ 239 kfree(srq->wrid); 240 mlx5_buf_free(dev->mdev, &srq->buf); 241 mlx5_db_free(dev->mdev, &srq->db); 242} 243 244struct ib_srq *mlx5_ib_create_srq(struct ib_pd *pd, 245 struct ib_srq_init_attr *init_attr, 246 struct ib_udata *udata) 247{ 248 struct mlx5_ib_dev *dev = to_mdev(pd->device); 249 struct mlx5_ib_srq *srq; 250 int desc_size; 251 int buf_size; 252 int err; 253 struct mlx5_create_srq_mbox_in *uninitialized_var(in); 254 int uninitialized_var(inlen); 255 int is_xrc; 256 u32 flgs, xrcdn; 257 __u32 max_srq_wqes = 1 << MLX5_CAP_GEN(dev->mdev, log_max_srq_sz); 258 259 /* Sanity check SRQ size before proceeding */ 260 if (init_attr->attr.max_wr >= max_srq_wqes) { 261 mlx5_ib_warn(dev, "max_wr %d, cap %d\n", 262 init_attr->attr.max_wr, 263 max_srq_wqes); 264 return ERR_PTR(-EINVAL); 265 } 266 267 srq = kmalloc(sizeof(*srq), GFP_KERNEL); 268 if (!srq) 269 return ERR_PTR(-ENOMEM); 270 271 mutex_init(&srq->mutex); 272 spin_lock_init(&srq->lock); 273 srq->msrq.max = roundup_pow_of_two(init_attr->attr.max_wr + 1); 274 srq->msrq.max_gs = init_attr->attr.max_sge; 275 276 desc_size = sizeof(struct mlx5_wqe_srq_next_seg) + 277 srq->msrq.max_gs * sizeof(struct mlx5_wqe_data_seg); 278 desc_size = roundup_pow_of_two(desc_size); 279 desc_size = max_t(int, 32, desc_size); 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 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", 285 desc_size, init_attr->attr.max_wr, srq->msrq.max, srq->msrq.max_gs, 286 srq->msrq.max_avail_gather); 287 288 if (pd->uobject) 289 err = create_srq_user(pd, srq, &in, udata, buf_size, &inlen); 290 else 291 err = create_srq_kernel(dev, srq, &in, buf_size, &inlen); 292 293 if (err) { 294 mlx5_ib_warn(dev, "create srq %s failed, err %d\n", 295 pd->uobject ? "user" : "kernel", err); 296 goto err_srq; 297 } 298 299 is_xrc = (init_attr->srq_type == IB_SRQT_XRC); 300 in->ctx.state_log_sz = ilog2(srq->msrq.max); 301 flgs = ((srq->msrq.wqe_shift - 4) | (is_xrc << 5) | (srq->wq_sig << 7)) << 24; 302 xrcdn = 0; 303 if (is_xrc) { 304 xrcdn = to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn; 305 in->ctx.pgoff_cqn |= cpu_to_be32(to_mcq(init_attr->ext.xrc.cq)->mcq.cqn); 306 } else if (init_attr->srq_type == IB_SRQT_BASIC) { 307 xrcdn = to_mxrcd(dev->devr.x0)->xrcdn; 308 in->ctx.pgoff_cqn |= cpu_to_be32(to_mcq(dev->devr.c0)->mcq.cqn); 309 } 310 311 in->ctx.flags_xrcd = cpu_to_be32((flgs & 0xFF000000) | (xrcdn & 0xFFFFFF)); 312 313 in->ctx.pd = cpu_to_be32(to_mpd(pd)->pdn); 314 in->ctx.db_record = cpu_to_be64(srq->db.dma); 315 err = mlx5_core_create_srq(dev->mdev, &srq->msrq, in, inlen, is_xrc); 316 kvfree(in); 317 if (err) { 318 mlx5_ib_warn(dev, "create SRQ failed, err %d\n", err); 319 goto err_usr_kern_srq; 320 } 321 322 mlx5_ib_dbg(dev, "create SRQ with srqn 0x%x\n", srq->msrq.srqn); 323 324 srq->msrq.event = mlx5_ib_srq_event; 325 srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn; 326 327 if (pd->uobject) 328 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof(__u32))) { 329 mlx5_ib_err(dev, "copy to user failed\n"); 330 err = -EFAULT; 331 goto err_core; 332 } 333 334 init_attr->attr.max_wr = srq->msrq.max - 1; 335 336 return &srq->ibsrq; 337 338err_core: 339 mlx5_core_destroy_srq(dev->mdev, &srq->msrq); 340 341err_usr_kern_srq: 342 if (pd->uobject) 343 destroy_srq_user(pd, srq); 344 else 345 destroy_srq_kernel(dev, srq); 346 347err_srq: 348 kfree(srq); 349 350 return ERR_PTR(err); 351} 352 353int mlx5_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr, 354 enum ib_srq_attr_mask attr_mask, struct ib_udata *udata) 355{ 356 struct mlx5_ib_dev *dev = to_mdev(ibsrq->device); 357 struct mlx5_ib_srq *srq = to_msrq(ibsrq); 358 int ret; 359 360 /* We don't support resizing SRQs yet */ 361 if (attr_mask & IB_SRQ_MAX_WR) 362 return -EINVAL; 363 364 if (attr_mask & IB_SRQ_LIMIT) { 365 if (attr->srq_limit >= srq->msrq.max) 366 return -EINVAL; 367 368 mutex_lock(&srq->mutex); 369 ret = mlx5_core_arm_srq(dev->mdev, &srq->msrq, attr->srq_limit, 1); 370 mutex_unlock(&srq->mutex); 371 372 if (ret) 373 return ret; 374 } 375 376 return 0; 377} 378 379int mlx5_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr) 380{ 381 struct mlx5_ib_dev *dev = to_mdev(ibsrq->device); 382 struct mlx5_ib_srq *srq = to_msrq(ibsrq); 383 int ret; 384 struct mlx5_query_srq_mbox_out *out; 385 386 out = kzalloc(sizeof(*out), GFP_KERNEL); 387 if (!out) 388 return -ENOMEM; 389 390 ret = mlx5_core_query_srq(dev->mdev, &srq->msrq, out); 391 if (ret) 392 goto out_box; 393 394 srq_attr->srq_limit = be16_to_cpu(out->ctx.lwm); 395 srq_attr->max_wr = srq->msrq.max - 1; 396 srq_attr->max_sge = srq->msrq.max_gs; 397 398out_box: 399 kfree(out); 400 return ret; 401} 402 403int mlx5_ib_destroy_srq(struct ib_srq *srq) 404{ 405 struct mlx5_ib_dev *dev = to_mdev(srq->device); 406 struct mlx5_ib_srq *msrq = to_msrq(srq); 407 408 mlx5_core_destroy_srq(dev->mdev, &msrq->msrq); 409 410 if (srq->uobject) { 411 mlx5_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db); 412 ib_umem_release(msrq->umem); 413 } else { 414 destroy_srq_kernel(dev, msrq); 415 } 416 417 kfree(srq); 418 return 0; 419} 420 421void mlx5_ib_free_srq_wqe(struct mlx5_ib_srq *srq, int wqe_index) 422{ 423 struct mlx5_wqe_srq_next_seg *next; 424 425 /* always called with interrupts disabled. */ 426 spin_lock(&srq->lock); 427 428 next = get_wqe(srq, srq->tail); 429 next->next_wqe_index = cpu_to_be16(wqe_index); 430 srq->tail = wqe_index; 431 432 spin_unlock(&srq->lock); 433} 434 435int mlx5_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr, 436 struct ib_recv_wr **bad_wr) 437{ 438 struct mlx5_ib_srq *srq = to_msrq(ibsrq); 439 struct mlx5_wqe_srq_next_seg *next; 440 struct mlx5_wqe_data_seg *scat; 441 struct mlx5_ib_dev *dev = to_mdev(ibsrq->device); 442 struct mlx5_core_dev *mdev = dev->mdev; 443 unsigned long flags; 444 int err = 0; 445 int nreq; 446 int i; 447 448 spin_lock_irqsave(&srq->lock, flags); 449 450 if (mdev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR) { 451 err = -EIO; 452 *bad_wr = wr; 453 nreq = 0; 454 goto out; 455 } 456 457 for (nreq = 0; wr; nreq++, wr = wr->next) { 458 if (unlikely(wr->num_sge > srq->msrq.max_gs)) { 459 err = -EINVAL; 460 *bad_wr = wr; 461 break; 462 } 463 464 if (unlikely(srq->head == srq->tail)) { 465 err = -ENOMEM; 466 *bad_wr = wr; 467 break; 468 } 469 470 srq->wrid[srq->head] = wr->wr_id; 471 472 next = get_wqe(srq, srq->head); 473 srq->head = be16_to_cpu(next->next_wqe_index); 474 scat = (struct mlx5_wqe_data_seg *)(next + 1); 475 476 for (i = 0; i < wr->num_sge; i++) { 477 scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length); 478 scat[i].lkey = cpu_to_be32(wr->sg_list[i].lkey); 479 scat[i].addr = cpu_to_be64(wr->sg_list[i].addr); 480 } 481 482 if (i < srq->msrq.max_avail_gather) { 483 scat[i].byte_count = 0; 484 scat[i].lkey = cpu_to_be32(MLX5_INVALID_LKEY); 485 scat[i].addr = 0; 486 } 487 } 488 489 if (likely(nreq)) { 490 srq->wqe_ctr += nreq; 491 492 /* Make sure that descriptors are written before 493 * doorbell record. 494 */ 495 wmb(); 496 497 *srq->db.db = cpu_to_be32(srq->wqe_ctr); 498 } 499out: 500 spin_unlock_irqrestore(&srq->lock, flags); 501 502 return err; 503} 504