kernel/drivers/infiniband/hw/mlx5/srq.c

   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_create_srq_mbox_in **in,
  78                            struct ib_udata *udata, int buf_size, int *inlen)
  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
  89         ucmdlen =
  90                 (udata->inlen - sizeof(struct ib_uverbs_cmd_hdr) <
  91                  sizeof(ucmd)) ? (sizeof(ucmd) -
  92                                   sizeof(ucmd.reserved)) : sizeof(ucmd);
  93
  94         if (ib_copy_from_udata(&ucmd, udata, ucmdlen)) {
  95                 mlx5_ib_dbg(dev, "failed copy udata\n");
  96                 return -EFAULT;
  97         }
  98
  99         if (ucmdlen == sizeof(ucmd) &&
 100             ucmd.reserved != 0)
 101                 return -EINVAL;
 102
 103         srq->wq_sig = !!(ucmd.flags & MLX5_SRQ_FLAG_SIGNATURE);
 104
 105         srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr, buf_size,
 106                                 0, 0);
 107         if (IS_ERR(srq->umem)) {
 108                 mlx5_ib_dbg(dev, "failed umem get, size %d\n", buf_size);
 109                 err = PTR_ERR(srq->umem);
 110                 return err;
 111         }
 112
 113         mlx5_ib_cont_pages(srq->umem, ucmd.buf_addr, &npages,
 114                            &page_shift, &ncont, NULL);
 115         err = mlx5_ib_get_buf_offset(ucmd.buf_addr, page_shift,
 116                                      &offset);
 117         if (err) {
 118                 mlx5_ib_warn(dev, "bad offset\n");
 119                 goto err_umem;
 120         }
 121
 122         *inlen = sizeof(**in) + sizeof(*(*in)->pas) * ncont;
 123         *in = mlx5_vzalloc(*inlen);
 124         if (!(*in)) {
 125                 err = -ENOMEM;
 126                 goto err_umem;
 127         }
 128
 129         mlx5_ib_populate_pas(dev, srq->umem, page_shift, (*in)->pas, 0);
 130
 131         err = mlx5_ib_db_map_user(to_mucontext(pd->uobject->context),
 132                                   ucmd.db_addr, &srq->db);
 133         if (err) {
 134                 mlx5_ib_dbg(dev, "map doorbell failed\n");
 135                 goto err_in;
 136         }
 137
 138         (*in)->ctx.log_pg_sz = page_shift - MLX5_ADAPTER_PAGE_SHIFT;
 139         (*in)->ctx.pgoff_cqn = cpu_to_be32(offset << 26);
 140
 141         return 0;
 142
 143 err_in:
 144         kvfree(*in);
 145
 146 err_umem:
 147         ib_umem_release(srq->umem);
 148
 149         return err;
 150 }
 151
 152 static int create_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq,
 153                              struct mlx5_create_srq_mbox_in **in, int buf_size,
 154                              int *inlen)
 155 {
 156         int err;
 157         int i;
 158         struct mlx5_wqe_srq_next_seg *next;
 159         int page_shift;
 160         int npages;
 161
 162         err = mlx5_db_alloc(dev->mdev, &srq->db);
 163         if (err) {
 164                 mlx5_ib_warn(dev, "alloc dbell rec failed\n");
 165                 return err;
 166         }
 167
 168         if (mlx5_buf_alloc(dev->mdev, buf_size, &srq->buf)) {
 169                 mlx5_ib_dbg(dev, "buf alloc failed\n");
 170                 err = -ENOMEM;
 171                 goto err_db;
 172         }
 173         page_shift = srq->buf.page_shift;
 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         npages = DIV_ROUND_UP(srq->buf.npages, 1 << (page_shift - PAGE_SHIFT));
 186         mlx5_ib_dbg(dev, "buf_size %d, page_shift %d, npages %d, calc npages %d\n",
 187                     buf_size, page_shift, srq->buf.npages, npages);
 188         *inlen = sizeof(**in) + sizeof(*(*in)->pas) * npages;
 189         *in = mlx5_vzalloc(*inlen);
 190         if (!*in) {
 191                 err = -ENOMEM;
 192                 goto err_buf;
 193         }
 194         mlx5_fill_page_array(&srq->buf, (*in)->pas);
 195
 196         srq->wrid = kmalloc(srq->msrq.max * sizeof(u64), GFP_KERNEL);
 197         if (!srq->wrid) {
 198                 mlx5_ib_dbg(dev, "kmalloc failed %lu\n",
 199                             (unsigned long)(srq->msrq.max * sizeof(u64)));
 200                 err = -ENOMEM;
 201                 goto err_in;
 202         }
 203         srq->wq_sig = !!srq_signature;
 204
 205         (*in)->ctx.log_pg_sz = page_shift - MLX5_ADAPTER_PAGE_SHIFT;
 206
 207         return 0;
 208
 209 err_in:
 210         kvfree(*in);
 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         int desc_size;
 241         int buf_size;
 242         int err;
 243         struct mlx5_create_srq_mbox_in *uninitialized_var(in);
 244         int uninitialized_var(inlen);
 245         int is_xrc;
 246         u32 flgs, xrcdn;
 247         __u32 max_srq_wqes = 1 << MLX5_CAP_GEN(dev->mdev, log_max_srq_sz);
 248
 249         /* Sanity check SRQ size before proceeding */
 250         if (init_attr->attr.max_wr >= max_srq_wqes) {
 251                 mlx5_ib_dbg(dev, "max_wr %d, cap %d\n",
 252                             init_attr->attr.max_wr,
 253                             max_srq_wqes);
 254                 return ERR_PTR(-EINVAL);
 255         }
 256
 257         srq = kmalloc(sizeof(*srq), GFP_KERNEL);
 258         if (!srq)
 259                 return ERR_PTR(-ENOMEM);
 260
 261         mutex_init(&srq->mutex);
 262         spin_lock_init(&srq->lock);
 263         srq->msrq.max    = roundup_pow_of_two(init_attr->attr.max_wr + 1);
 264         srq->msrq.max_gs = init_attr->attr.max_sge;
 265
 266         desc_size = sizeof(struct mlx5_wqe_srq_next_seg) +
 267                     srq->msrq.max_gs * sizeof(struct mlx5_wqe_data_seg);
 268         desc_size = roundup_pow_of_two(desc_size);
 269         desc_size = max_t(int, 32, desc_size);
 270         srq->msrq.max_avail_gather = (desc_size - sizeof(struct mlx5_wqe_srq_next_seg)) /
 271                 sizeof(struct mlx5_wqe_data_seg);
 272         srq->msrq.wqe_shift = ilog2(desc_size);
 273         buf_size = srq->msrq.max * desc_size;
 274         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",
 275                     desc_size, init_attr->attr.max_wr, srq->msrq.max, srq->msrq.max_gs,
 276                     srq->msrq.max_avail_gather);
 277
 278         if (pd->uobject)
 279                 err = create_srq_user(pd, srq, &in, udata, buf_size, &inlen);
 280         else
 281                 err = create_srq_kernel(dev, srq, &in, buf_size, &inlen);
 282
 283         if (err) {
 284                 mlx5_ib_warn(dev, "create srq %s failed, err %d\n",
 285                              pd->uobject ? "user" : "kernel", err);
 286                 goto err_srq;
 287         }
 288
 289         is_xrc = (init_attr->srq_type == IB_SRQT_XRC);
 290         in->ctx.state_log_sz = ilog2(srq->msrq.max);
 291         flgs = ((srq->msrq.wqe_shift - 4) | (is_xrc << 5) | (srq->wq_sig << 7)) << 24;
 292         xrcdn = 0;
 293         if (is_xrc) {
 294                 xrcdn = to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn;
 295                 in->ctx.pgoff_cqn |= cpu_to_be32(to_mcq(init_attr->ext.xrc.cq)->mcq.cqn);
 296         } else if (init_attr->srq_type == IB_SRQT_BASIC) {
 297                 xrcdn = to_mxrcd(dev->devr.x0)->xrcdn;
 298                 in->ctx.pgoff_cqn |= cpu_to_be32(to_mcq(dev->devr.c0)->mcq.cqn);
 299         }
 300
 301         in->ctx.flags_xrcd = cpu_to_be32((flgs & 0xFF000000) | (xrcdn & 0xFFFFFF));
 302
 303         in->ctx.pd = cpu_to_be32(to_mpd(pd)->pdn);
 304         in->ctx.db_record = cpu_to_be64(srq->db.dma);
 305         err = mlx5_core_create_srq(dev->mdev, &srq->msrq, in, inlen, is_xrc);
 306         kvfree(in);
 307         if (err) {
 308                 mlx5_ib_dbg(dev, "create SRQ failed, err %d\n", err);
 309                 goto err_usr_kern_srq;
 310         }
 311
 312         mlx5_ib_dbg(dev, "create SRQ with srqn 0x%x\n", srq->msrq.srqn);
 313
 314         srq->msrq.event = mlx5_ib_srq_event;
 315         srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn;
 316
 317         if (pd->uobject)
 318                 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof(__u32))) {
 319                         mlx5_ib_dbg(dev, "copy to user failed\n");
 320                         err = -EFAULT;
 321                         goto err_core;
 322                 }
 323
 324         init_attr->attr.max_wr = srq->msrq.max - 1;
 325
 326         return &srq->ibsrq;
 327
 328 err_core:
 329         mlx5_core_destroy_srq(dev->mdev, &srq->msrq);
 330
 331 err_usr_kern_srq:
 332         if (pd->uobject)
 333                 destroy_srq_user(pd, srq);
 334         else
 335                 destroy_srq_kernel(dev, srq);
 336
 337 err_srq:
 338         kfree(srq);
 339
 340         return ERR_PTR(err);
 341 }
 342
 343 int mlx5_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
 344                        enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
 345 {
 346         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
 347         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 348         int ret;
 349
 350         /* We don't support resizing SRQs yet */
 351         if (attr_mask & IB_SRQ_MAX_WR)
 352                 return -EINVAL;
 353
 354         if (attr_mask & IB_SRQ_LIMIT) {
 355                 if (attr->srq_limit >= srq->msrq.max)
 356                         return -EINVAL;
 357
 358                 mutex_lock(&srq->mutex);
 359                 ret = mlx5_core_arm_srq(dev->mdev, &srq->msrq, attr->srq_limit, 1);
 360                 mutex_unlock(&srq->mutex);
 361
 362                 if (ret)
 363                         return ret;
 364         }
 365
 366         return 0;
 367 }
 368
 369 int mlx5_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
 370 {
 371         struct mlx5_ib_dev *dev = to_mdev(ibsrq->device);
 372         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 373         int ret;
 374         struct mlx5_query_srq_mbox_out *out;
 375
 376         out = kzalloc(sizeof(*out), GFP_KERNEL);
 377         if (!out)
 378                 return -ENOMEM;
 379
 380         ret = mlx5_core_query_srq(dev->mdev, &srq->msrq, out);
 381         if (ret)
 382                 goto out_box;
 383
 384         srq_attr->srq_limit = be16_to_cpu(out->ctx.lwm);
 385         srq_attr->max_wr    = srq->msrq.max - 1;
 386         srq_attr->max_sge   = srq->msrq.max_gs;
 387
 388 out_box:
 389         kfree(out);
 390         return ret;
 391 }
 392
 393 int mlx5_ib_destroy_srq(struct ib_srq *srq)
 394 {
 395         struct mlx5_ib_dev *dev = to_mdev(srq->device);
 396         struct mlx5_ib_srq *msrq = to_msrq(srq);
 397
 398         mlx5_core_destroy_srq(dev->mdev, &msrq->msrq);
 399
 400         if (srq->uobject) {
 401                 mlx5_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db);
 402                 ib_umem_release(msrq->umem);
 403         } else {
 404                 destroy_srq_kernel(dev, msrq);
 405         }
 406
 407         kfree(srq);
 408         return 0;
 409 }
 410
 411 void mlx5_ib_free_srq_wqe(struct mlx5_ib_srq *srq, int wqe_index)
 412 {
 413         struct mlx5_wqe_srq_next_seg *next;
 414
 415         /* always called with interrupts disabled. */
 416         spin_lock(&srq->lock);
 417
 418         next = get_wqe(srq, srq->tail);
 419         next->next_wqe_index = cpu_to_be16(wqe_index);
 420         srq->tail = wqe_index;
 421
 422         spin_unlock(&srq->lock);
 423 }
 424
 425 int mlx5_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
 426                           struct ib_recv_wr **bad_wr)
 427 {
 428         struct mlx5_ib_srq *srq = to_msrq(ibsrq);
 429         struct mlx5_wqe_srq_next_seg *next;
 430         struct mlx5_wqe_data_seg *scat;
 431         unsigned long flags;
 432         int err = 0;
 433         int nreq;
 434         int i;
 435
 436         spin_lock_irqsave(&srq->lock, flags);
 437
 438         for (nreq = 0; wr; nreq++, wr = wr->next) {
 439                 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
 440                         err = -EINVAL;
 441                         *bad_wr = wr;
 442                         break;
 443                 }
 444
 445                 if (unlikely(srq->head == srq->tail)) {
 446                         err = -ENOMEM;
 447                         *bad_wr = wr;
 448                         break;
 449                 }
 450
 451                 srq->wrid[srq->head] = wr->wr_id;
 452
 453                 next      = get_wqe(srq, srq->head);
 454                 srq->head = be16_to_cpu(next->next_wqe_index);
 455                 scat      = (struct mlx5_wqe_data_seg *)(next + 1);
 456
 457                 for (i = 0; i < wr->num_sge; i++) {
 458                         scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
 459                         scat[i].lkey       = cpu_to_be32(wr->sg_list[i].lkey);
 460                         scat[i].addr       = cpu_to_be64(wr->sg_list[i].addr);
 461                 }
 462
 463                 if (i < srq->msrq.max_avail_gather) {
 464                         scat[i].byte_count = 0;
 465                         scat[i].lkey       = cpu_to_be32(MLX5_INVALID_LKEY);
 466                         scat[i].addr       = 0;
 467                 }
 468         }
 469
 470         if (likely(nreq)) {
 471                 srq->wqe_ctr += nreq;
 472
 473                 /* Make sure that descriptors are written before
 474                  * doorbell record.
 475                  */
 476                 wmb();
 477
 478                 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
 479         }
 480
 481         spin_unlock_irqrestore(&srq->lock, flags);
 482
 483         return err;
 484 }