drivers/infiniband/sw/rxe/rxe_srq.c

   1 /*
   2  * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
   3  * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the
   9  * OpenIB.org BSD license below:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *        copyright notice, this list of conditions and the following
  17  *        disclaimer.
  18  *
  19  *      - Redistributions in binary form must reproduce the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer in the documentation and/or other materials
  22  *        provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33
  34 #include "rxe.h"
  35 #include "rxe_loc.h"
  36 #include "rxe_queue.h"
  37
  38 int rxe_srq_chk_attr(struct rxe_dev *rxe, struct rxe_srq *srq,
  39                      struct ib_srq_attr *attr, enum ib_srq_attr_mask mask)
  40 {
  41         if (srq && srq->error) {
  42                 pr_warn("srq in error state\n");
  43                 goto err1;
  44         }
  45
  46         if (mask & IB_SRQ_MAX_WR) {
  47                 if (attr->max_wr > rxe->attr.max_srq_wr) {
  48                         pr_warn("max_wr(%d) > max_srq_wr(%d)\n",
  49                                 attr->max_wr, rxe->attr.max_srq_wr);
  50                         goto err1;
  51                 }
  52
  53                 if (attr->max_wr <= 0) {
  54                         pr_warn("max_wr(%d) <= 0\n", attr->max_wr);
  55                         goto err1;
  56                 }
  57
  58                 if (srq && srq->limit && (attr->max_wr < srq->limit)) {
  59                         pr_warn("max_wr (%d) < srq->limit (%d)\n",
  60                                 attr->max_wr, srq->limit);
  61                         goto err1;
  62                 }
  63
  64                 if (attr->max_wr < RXE_MIN_SRQ_WR)
  65                         attr->max_wr = RXE_MIN_SRQ_WR;
  66         }
  67
  68         if (mask & IB_SRQ_LIMIT) {
  69                 if (attr->srq_limit > rxe->attr.max_srq_wr) {
  70                         pr_warn("srq_limit(%d) > max_srq_wr(%d)\n",
  71                                 attr->srq_limit, rxe->attr.max_srq_wr);
  72                         goto err1;
  73                 }
  74
  75                 if (srq && (attr->srq_limit > srq->rq.queue->buf->index_mask)) {
  76                         pr_warn("srq_limit (%d) > cur limit(%d)\n",
  77                                 attr->srq_limit,
  78                                  srq->rq.queue->buf->index_mask);
  79                         goto err1;
  80                 }
  81         }
  82
  83         if (mask == IB_SRQ_INIT_MASK) {
  84                 if (attr->max_sge > rxe->attr.max_srq_sge) {
  85                         pr_warn("max_sge(%d) > max_srq_sge(%d)\n",
  86                                 attr->max_sge, rxe->attr.max_srq_sge);
  87                         goto err1;
  88                 }
  89
  90                 if (attr->max_sge < RXE_MIN_SRQ_SGE)
  91                         attr->max_sge = RXE_MIN_SRQ_SGE;
  92         }
  93
  94         return 0;
  95
  96 err1:
  97         return -EINVAL;
  98 }
  99
 100 int rxe_srq_from_init(struct rxe_dev *rxe, struct rxe_srq *srq,
 101                       struct ib_srq_init_attr *init,
 102                       struct ib_ucontext *context, struct ib_udata *udata)
 103 {
 104         int err;
 105         int srq_wqe_size;
 106         struct rxe_queue *q;
 107
 108         srq->ibsrq.event_handler        = init->event_handler;
 109         srq->ibsrq.srq_context          = init->srq_context;
 110         srq->limit              = init->attr.srq_limit;
 111         srq->srq_num            = srq->pelem.index;
 112         srq->rq.max_wr          = init->attr.max_wr;
 113         srq->rq.max_sge         = init->attr.max_sge;
 114
 115         srq_wqe_size            = rcv_wqe_size(srq->rq.max_sge);
 116
 117         spin_lock_init(&srq->rq.producer_lock);
 118         spin_lock_init(&srq->rq.consumer_lock);
 119
 120         q = rxe_queue_init(rxe, &srq->rq.max_wr,
 121                            srq_wqe_size);
 122         if (!q) {
 123                 pr_warn("unable to allocate queue for srq\n");
 124                 return -ENOMEM;
 125         }
 126
 127         srq->rq.queue = q;
 128
 129         err = do_mmap_info(rxe, udata, false, context, q->buf,
 130                            q->buf_size, &q->ip);
 131         if (err)
 132                 return err;
 133
 134         if (udata && udata->outlen >= sizeof(struct mminfo) + sizeof(u32)) {
 135                 if (copy_to_user(udata->outbuf + sizeof(struct mminfo),
 136                                  &srq->srq_num, sizeof(u32)))
 137                         return -EFAULT;
 138         }
 139         return 0;
 140 }
 141
 142 int rxe_srq_from_attr(struct rxe_dev *rxe, struct rxe_srq *srq,
 143                       struct ib_srq_attr *attr, enum ib_srq_attr_mask mask,
 144                       struct ib_udata *udata)
 145 {
 146         int err;
 147         struct rxe_queue *q = srq->rq.queue;
 148         struct mminfo mi = { .offset = 1, .size = 0};
 149
 150         if (mask & IB_SRQ_MAX_WR) {
 151                 /* Check that we can write the mminfo struct to user space */
 152                 if (udata && udata->inlen >= sizeof(__u64)) {
 153                         __u64 mi_addr;
 154
 155                         /* Get address of user space mminfo struct */
 156                         err = ib_copy_from_udata(&mi_addr, udata,
 157                                                  sizeof(mi_addr));
 158                         if (err)
 159                                 goto err1;
 160
 161                         udata->outbuf = (void __user *)(unsigned long)mi_addr;
 162                         udata->outlen = sizeof(mi);
 163
 164                         if (!access_ok(VERIFY_WRITE,
 165                                        (void __user *)udata->outbuf,
 166                                         udata->outlen)) {
 167                                 err = -EFAULT;
 168                                 goto err1;
 169                         }
 170                 }
 171
 172                 err = rxe_queue_resize(q, &attr->max_wr,
 173                                        rcv_wqe_size(srq->rq.max_sge),
 174                                        srq->rq.queue->ip ?
 175                                                 srq->rq.queue->ip->context :
 176                                                 NULL,
 177                                        udata, &srq->rq.producer_lock,
 178                                        &srq->rq.consumer_lock);
 179                 if (err)
 180                         goto err2;
 181         }
 182
 183         if (mask & IB_SRQ_LIMIT)
 184                 srq->limit = attr->srq_limit;
 185
 186         return 0;
 187
 188 err2:
 189         rxe_queue_cleanup(q);
 190         srq->rq.queue = NULL;
 191 err1:
 192         return err;
 193 }