sys/dev/mlx5/mlx5_ib/mlx5_ib_srq.c

   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_create_srq_mbox_in **in,
  72                            struct ib_udata *udata, int buf_size, int *inlen,
  73                            int type)
  74 {
  75         struct mlx5_ib_dev *dev = to_mdev(pd->device);
  76         struct mlx5_ib_create_srq ucmd = {};
  77         size_t ucmdlen;
  78         int err;
  79         int npages;
  80         int page_shift;
  81         int ncont;
  82         u32 offset;
  83         u32 uidx = MLX5_IB_DEFAULT_UIDX;
  84
  85         ucmdlen = min(udata->inlen, sizeof(ucmd));
  86
  87         if (ib_copy_from_udata(&ucmd, udata, ucmdlen)) {
  88                 mlx5_ib_dbg(dev, "failed copy udata\n");
  89                 return -EFAULT;
  90         }
  91
  92         if (ucmd.reserved0 || ucmd.reserved1)
  93                 return -EINVAL;
  94
  95         if (udata->inlen > sizeof(ucmd) &&
  96             !ib_is_udata_cleared(udata, sizeof(ucmd),
  97                                  udata->inlen - sizeof(ucmd)))
  98                 return -EINVAL;
  99
 100         if (type == IB_SRQT_XRC) {
 101                 err = get_srq_user_index(to_mucontext(pd->uobject->context),
 102                                          &ucmd, udata->inlen, &uidx);
 103                 if (err)
 104                         return err;
 105         }
 106
 107         srq->wq_sig = !!(ucmd.flags & MLX5_SRQ_FLAG_SIGNATURE);
 108
 109         srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr, buf_size,
 110                                 0, 0);
 111         if (IS_ERR(srq->umem)) {
 112                 mlx5_ib_dbg(dev, "failed umem get, size %d\n", buf_size);
 113                 err = PTR_ERR(srq->umem);
 114                 return err;
 115         }
 116
 117         mlx5_ib_cont_pages(srq->umem, ucmd.buf_addr, &npages,
 118                            &page_shift, &ncont, NULL);
 119         err = mlx5_ib_get_buf_offset(ucmd.buf_addr, page_shift,
 120                                      &offset);
 121         if (err) {
 122                 mlx5_ib_warn(dev, "bad offset\n");
 123                 goto err_umem;
 124         }
 125
 126         *inlen = sizeof(**in) + sizeof(*(*in)->pas) * ncont;
 127         *in = mlx5_vzalloc(*inlen);
 128         if (!(*in)) {
 129                 err = -ENOMEM;
 130                 goto err_umem;
 131         }
 132
 133         mlx5_ib_populate_pas(dev, srq->umem, page_shift, (*in)->pas, 0);
 134
 135         err = mlx5_ib_db_map_user(to_mucontext(pd->uobject->context),
 136                                   ucmd.db_addr, &srq->db);
 137         if (err) {
 138                 mlx5_ib_dbg(dev, "map doorbell failed\n");
 139                 goto err_in;
 140         }
 141
 142         (*in)->ctx.log_pg_sz = page_shift - MLX5_ADAPTER_PAGE_SHIFT;
 143         (*in)->ctx.pgoff_cqn = cpu_to_be32(offset << 26);
 144
 145         if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 &&
 146             type == IB_SRQT_XRC) {
 147                 void *xsrqc = MLX5_ADDR_OF(create_xrc_srq_in, *in,
 148                                            xrc_srq_context_entry);
 149                 MLX5_SET(xrc_srqc, xsrqc, user_index, uidx);
 150         }
 151
 152         return 0;
 153
 154 err_in:
 155         kvfree(*in);
 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_create_srq_mbox_in **in, int buf_size,
 165                              int *inlen, int type)
 166 {
 167         int err;
 168         int i;
 169         struct mlx5_wqe_srq_next_seg *next;
 170         int page_shift;
 171         int npages;
 172
 173         err = mlx5_db_alloc(dev->mdev, &srq->db);
 174         if (err) {
 175                 mlx5_ib_warn(dev, "alloc dbell rec failed\n");
 176                 return err;
 177         }
 178
 179         if (mlx5_buf_alloc(dev->mdev, buf_size, 2 * PAGE_SIZE, &srq->buf)) {
 180                 mlx5_ib_dbg(dev, "buf alloc failed\n");
 181                 err = -ENOMEM;
 182                 goto err_db;
 183         }
 184         page_shift = srq->buf.page_shift;
 185
 186         srq->head    = 0;
 187         srq->tail    = srq->msrq.max - 1;
 188         srq->wqe_ctr = 0;
 189
 190         for (i = 0; i < srq->msrq.max; i++) {
 191                 next = get_wqe(srq, i);
 192                 next->next_wqe_index =
 193                         cpu_to_be16((i + 1) & (srq->msrq.max - 1));
 194         }
 195
 196         npages = DIV_ROUND_UP(srq->buf.npages, 1 << (page_shift - PAGE_SHIFT));
 197         mlx5_ib_dbg(dev, "buf_size %d, page_shift %d, npages %d, calc npages %d\n",
 198                     buf_size, page_shift, srq->buf.npages, npages);
 199         *inlen = sizeof(**in) + sizeof(*(*in)->pas) * npages;
 200         *in = mlx5_vzalloc(*inlen);
 201         if (!*in) {
 202                 err = -ENOMEM;
 203                 goto err_buf;
 204         }
 205         mlx5_fill_page_array(&srq->buf, (*in)->pas);
 206
 207         srq->wrid = kmalloc(srq->msrq.max * sizeof(u64), GFP_KERNEL);
 208         if (!srq->wrid) {
 209                 mlx5_ib_dbg(dev, "kmalloc failed %lu\n",
 210                             (unsigned long)(srq->msrq.max * sizeof(u64)));
 211                 err = -ENOMEM;
 212                 goto err_in;
 213         }
 214         srq->wq_sig = !!srq_signature;
 215
 216         (*in)->ctx.log_pg_sz = page_shift - MLX5_ADAPTER_PAGE_SHIFT;
 217
 218         if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 &&
 219             type == IB_SRQT_XRC) {
 220                 void *xsrqc = MLX5_ADDR_OF(create_xrc_srq_in, *in,
 221                                            xrc_srq_context_entry);
 222                 MLX5_SET(xrc_srqc, xsrqc, user_index, MLX5_IB_DEFAULT_UIDX);
 223         }
 224
 225         return 0;
 226
 227 err_in:
 228         kvfree(*in);
 229
 230 err_buf:
 231         mlx5_buf_free(dev->mdev, &srq->buf);
 232
 233 err_db:
 234         mlx5_db_free(dev->mdev, &srq->db);
 235         return err;
 236 }
 237
 238 static void destroy_srq_user(struct ib_pd *pd, struct mlx5_ib_srq *srq)
 239 {
 240         mlx5_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db);
 241         ib_umem_release(srq->umem);
 242 }
 243
 244
 245 static void destroy_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq)
 246 {
 247         kfree(srq->wrid);
 248         mlx5_buf_free(dev->mdev, &srq->buf);
 249         mlx5_db_free(dev->mdev, &srq->db);
 250 }
 251
 252 struct ib_srq *mlx5_ib_create_srq(struct ib_pd *pd,
 253                                   struct ib_srq_init_attr *init_attr,
 254                                   struct ib_udata *udata)
 255 {
 256         struct mlx5_ib_dev *dev = to_mdev(pd->device);
 257         struct mlx5_ib_srq *srq;
 258         int desc_size;
 259         int buf_size;
 260         int err;
 261         struct mlx5_create_srq_mbox_in *uninitialized_var(in);
 262         int uninitialized_var(inlen);
 263         int is_xrc;
 264         u32 flgs, xrcdn;
 265         __u32 max_srq_wqes = 1 << MLX5_CAP_GEN(dev->mdev, log_max_srq_sz);
 266
 267         /* Sanity check SRQ size before proceeding */
 268         if (init_attr->attr.max_wr >= max_srq_wqes) {
 269                 mlx5_ib_dbg(dev, "max_wr %d, cap %d\n",
 270                             init_attr->attr.max_wr,
 271                             max_srq_wqes);
 272                 return ERR_PTR(-EINVAL);
 273         }
 274
 275         srq = kmalloc(sizeof(*srq), GFP_KERNEL);
 276         if (!srq)
 277                 return ERR_PTR(-ENOMEM);
 278
 279         mutex_init(&srq->mutex);
 280         spin_lock_init(&srq->lock);
 281         srq->msrq.max    = roundup_pow_of_two(init_attr->attr.max_wr + 1);
 282         srq->msrq.max_gs = init_attr->attr.max_sge;
 283
 284         desc_size = sizeof(struct mlx5_wqe_srq_next_seg) +
 285                     srq->msrq.max_gs * sizeof(struct mlx5_wqe_data_seg);
 286         desc_size = roundup_pow_of_two(desc_size);
 287         desc_size = max_t(int, 32, desc_size);
 288         srq->msrq.max_avail_gather = (desc_size - sizeof(struct mlx5_wqe_srq_next_seg)) /
 289                 sizeof(struct mlx5_wqe_data_seg);
 290         srq->msrq.wqe_shift = ilog2(desc_size);
 291         buf_size = srq->msrq.max * desc_size;
 292         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",
 293                     desc_size, init_attr->attr.max_wr, srq->msrq.max, srq->msrq.max_gs,
 294                     srq->msrq.max_avail_gather);
 295
 296         if (pd->uobject)
 297                 err = create_srq_user(pd, srq, &in, udata, buf_size, &inlen, init_attr->srq_type);
 298         else
 299                 err = create_srq_kernel(dev, srq, &in, buf_size, &inlen, init_attr->srq_type);
 300
 301         if (err) {
 302                 mlx5_ib_warn(dev, "create srq %s failed, err %d\n",
 303                              pd->uobject ? "user" : "kernel", err);
 304                 goto err_srq;
 305         }
 306
 307         is_xrc = (init_attr->srq_type == IB_SRQT_XRC);
 308         in->ctx.state_log_sz = ilog2(srq->msrq.max);
 309         flgs = ((srq->msrq.wqe_shift - 4) | (is_xrc << 5) | (srq->wq_sig << 7)) << 24;
 310         xrcdn = 0;
 311         if (is_xrc) {
 312                 xrcdn = to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn;
 313                 in->ctx.pgoff_cqn |= cpu_to_be32(to_mcq(init_attr->ext.xrc.cq)->mcq.cqn);
 314         } else if (init_attr->srq_type == IB_SRQT_BASIC) {
 315                 xrcdn = to_mxrcd(dev->devr.x0)->xrcdn;
 316                 in->ctx.pgoff_cqn |= cpu_to_be32(to_mcq(dev->devr.c0)->mcq.cqn);
 317         }
 318
 319         in->ctx.flags_xrcd = cpu_to_be32((flgs & 0xFF000000) | (xrcdn & 0xFFFFFF));
 320
 321         in->ctx.pd = cpu_to_be32(to_mpd(pd)->pdn);
 322         in->ctx.db_record = cpu_to_be64(srq->db.dma);
 323         err = mlx5_core_create_srq(dev->mdev, &srq->msrq, in, inlen, is_xrc);
 324         kvfree(in);
 325         if (err) {
 326                 mlx5_ib_dbg(dev, "create SRQ failed, err %d\n", err);
 327                 goto err_usr_kern_srq;
 328         }
 329
 330         mlx5_ib_dbg(dev, "create SRQ with srqn 0x%x\n", srq->msrq.srqn);
 331
 332         srq->msrq.event = mlx5_ib_srq_event;
 333         srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn;
 334
 335         if (pd->uobject)
 336                 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof(__u32))) {
 337                         mlx5_ib_dbg(dev, "copy to user failed\n");
 338                         err = -EFAULT;
 339                         goto err_core;
 340                 }
 341
 342         init_attr->attr.max_wr = srq->msrq.max - 1;
 343
 344         return &srq->ibsrq;
 345
 346 err_core:
 347         mlx5_core_destroy_srq(dev->mdev, &srq->msrq);
 348
 349 err_usr_kern_srq:
 350         if (pd->uobject)
 351                 destroy_srq_user(pd, srq);
 352         else
 353                 destroy_srq_kernel(dev, srq);
 354
 355 err_srq:
 356         kfree(srq);
 357
 358         return ERR_PTR(err);
 359 }
 360
 361 int mlx5_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
 362                        enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
 363 {
 364         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
 365         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 366         int ret;
 367
 368         /* We don't support resizing SRQs yet */
 369         if (attr_mask & IB_SRQ_MAX_WR)
 370                 return -EINVAL;
 371
 372         if (attr_mask & IB_SRQ_LIMIT) {
 373                 if (attr->srq_limit >= srq->msrq.max)
 374                         return -EINVAL;
 375
 376                 mutex_lock(&srq->mutex);
 377                 ret = mlx5_core_arm_srq(dev->mdev, &srq->msrq, attr->srq_limit, 1);
 378                 mutex_unlock(&srq->mutex);
 379
 380                 if (ret)
 381                         return ret;
 382         }
 383
 384         return 0;
 385 }
 386
 387 int mlx5_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
 388 {
 389         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
 390         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 391         int ret;
 392         struct mlx5_query_srq_mbox_out *out;
 393
 394         out = kzalloc(sizeof(*out), GFP_KERNEL);
 395         if (!out)
 396                 return -ENOMEM;
 397
 398         ret = mlx5_core_query_srq(dev->mdev, &srq->msrq, out);
 399         if (ret)
 400                 goto out_box;
 401
 402         srq_attr->srq_limit = be16_to_cpu(out->ctx.lwm);
 403         srq_attr->max_wr    = srq->msrq.max - 1;
 404         srq_attr->max_sge   = srq->msrq.max_gs;
 405
 406 out_box:
 407         kfree(out);
 408         return ret;
 409 }
 410
 411 int mlx5_ib_destroy_srq(struct ib_srq *srq)
 412 {
 413         struct mlx5_ib_dev *dev = to_mdev(srq->device);
 414         struct mlx5_ib_srq *msrq = to_msrq(srq);
 415
 416         mlx5_core_destroy_srq(dev->mdev, &msrq->msrq);
 417
 418         if (srq->uobject) {
 419                 mlx5_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db);
 420                 ib_umem_release(msrq->umem);
 421         } else {
 422                 destroy_srq_kernel(dev, msrq);
 423         }
 424
 425         kfree(srq);
 426         return 0;
 427 }
 428
 429 void mlx5_ib_free_srq_wqe(struct mlx5_ib_srq *srq, int wqe_index)
 430 {
 431         struct mlx5_wqe_srq_next_seg *next;
 432
 433         /* always called with interrupts disabled. */
 434         spin_lock(&srq->lock);
 435
 436         next = get_wqe(srq, srq->tail);
 437         next->next_wqe_index = cpu_to_be16(wqe_index);
 438         srq->tail = wqe_index;
 439
 440         spin_unlock(&srq->lock);
 441 }
 442
 443 int mlx5_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
 444                           struct ib_recv_wr **bad_wr)
 445 {
 446         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 447         struct mlx5_wqe_srq_next_seg *next;
 448         struct mlx5_wqe_data_seg *scat;
 449         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
 450         struct mlx5_core_dev *mdev = dev->mdev;
 451         unsigned long flags;
 452         int err = 0;
 453         int nreq;
 454         int i;
 455
 456         spin_lock_irqsave(&srq->lock, flags);
 457
 458         if (mdev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR) {
 459                 err = -EIO;
 460                 *bad_wr = wr;
 461                 goto out;
 462         }
 463
 464         for (nreq = 0; wr; nreq++, wr = wr->next) {
 465                 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
 466                         err = -EINVAL;
 467                         *bad_wr = wr;
 468                         break;
 469                 }
 470
 471                 if (unlikely(srq->head == srq->tail)) {
 472                         err = -ENOMEM;
 473                         *bad_wr = wr;
 474                         break;
 475                 }
 476
 477                 srq->wrid[srq->head] = wr->wr_id;
 478
 479                 next      = get_wqe(srq, srq->head);
 480                 srq->head = be16_to_cpu(next->next_wqe_index);
 481                 scat      = (struct mlx5_wqe_data_seg *)(next + 1);
 482
 483                 for (i = 0; i < wr->num_sge; i++) {
 484                         scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
 485                         scat[i].lkey       = cpu_to_be32(wr->sg_list[i].lkey);
 486                         scat[i].addr       = cpu_to_be64(wr->sg_list[i].addr);
 487                 }
 488
 489                 if (i < srq->msrq.max_avail_gather) {
 490                         scat[i].byte_count = 0;
 491                         scat[i].lkey       = cpu_to_be32(MLX5_INVALID_LKEY);
 492                         scat[i].addr       = 0;
 493                 }
 494         }
 495
 496         if (likely(nreq)) {
 497                 srq->wqe_ctr += nreq;
 498
 499                 /* Make sure that descriptors are written before
 500                  * doorbell record.
 501                  */
 502                 wmb();
 503
 504                 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
 505         }
 506 out:
 507         spin_unlock_irqrestore(&srq->lock, flags);
 508
 509         return err;
 510 }