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 <linux/vmalloc.h>
  35 #include "rxe.h"
  36 #include "rxe_loc.h"
  37 #include "rxe_queue.h"
  38
  39 int rxe_srq_chk_attr(struct rxe_dev *rxe, struct rxe_srq *srq,
  40                      struct ib_srq_attr *attr, enum ib_srq_attr_mask mask)
  41 {
  42         if (srq && srq->error) {
  43                 pr_warn("srq in error state\n");
  44                 goto err1;
  45         }
  46
  47         if (mask & IB_SRQ_MAX_WR) {
  48                 if (attr->max_wr > rxe->attr.max_srq_wr) {
  49                         pr_warn("max_wr(%d) > max_srq_wr(%d)\n",
  50                                 attr->max_wr, rxe->attr.max_srq_wr);
  51                         goto err1;
  52                 }
  53
  54                 if (attr->max_wr <= 0) {
  55                         pr_warn("max_wr(%d) <= 0\n", attr->max_wr);
  56                         goto err1;
  57                 }
  58
  59                 if (srq && srq->limit && (attr->max_wr < srq->limit)) {
  60                         pr_warn("max_wr (%d) < srq->limit (%d)\n",
  61                                 attr->max_wr, srq->limit);
  62                         goto err1;
  63                 }
  64
  65                 if (attr->max_wr < RXE_MIN_SRQ_WR)
  66                         attr->max_wr = RXE_MIN_SRQ_WR;
  67         }
  68
  69         if (mask & IB_SRQ_LIMIT) {
  70                 if (attr->srq_limit > rxe->attr.max_srq_wr) {
  71                         pr_warn("srq_limit(%d) > max_srq_wr(%d)\n",
  72                                 attr->srq_limit, rxe->attr.max_srq_wr);
  73                         goto err1;
  74                 }
  75
  76                 if (srq && (attr->srq_limit > srq->rq.queue->buf->index_mask)) {
  77                         pr_warn("srq_limit (%d) > cur limit(%d)\n",
  78                                 attr->srq_limit,
  79                                  srq->rq.queue->buf->index_mask);
  80                         goto err1;
  81                 }
  82         }
  83
  84         if (mask == IB_SRQ_INIT_MASK) {
  85                 if (attr->max_sge > rxe->attr.max_srq_sge) {
  86                         pr_warn("max_sge(%d) > max_srq_sge(%d)\n",
  87                                 attr->max_sge, rxe->attr.max_srq_sge);
  88                         goto err1;
  89                 }
  90
  91                 if (attr->max_sge < RXE_MIN_SRQ_SGE)
  92                         attr->max_sge = RXE_MIN_SRQ_SGE;
  93         }
  94
  95         return 0;
  96
  97 err1:
  98         return -EINVAL;
  99 }
 100
 101 int rxe_srq_from_init(struct rxe_dev *rxe, struct rxe_srq *srq,
 102                       struct ib_srq_init_attr *init,
 103                       struct ib_ucontext *context,
 104                       struct rxe_create_srq_resp __user *uresp)
 105 {
 106         int err;
 107         int srq_wqe_size;
 108         struct rxe_queue *q;
 109
 110         srq->ibsrq.event_handler        = init->event_handler;
 111         srq->ibsrq.srq_context          = init->srq_context;
 112         srq->limit              = init->attr.srq_limit;
 113         srq->srq_num            = srq->pelem.index;
 114         srq->rq.max_wr          = init->attr.max_wr;
 115         srq->rq.max_sge         = init->attr.max_sge;
 116
 117         srq_wqe_size            = rcv_wqe_size(srq->rq.max_sge);
 118
 119         spin_lock_init(&srq->rq.producer_lock);
 120         spin_lock_init(&srq->rq.consumer_lock);
 121
 122         q = rxe_queue_init(rxe, &srq->rq.max_wr,
 123                            srq_wqe_size);
 124         if (!q) {
 125                 pr_warn("unable to allocate queue for srq\n");
 126                 return -ENOMEM;
 127         }
 128
 129         srq->rq.queue = q;
 130
 131         err = do_mmap_info(rxe, uresp ? &uresp->mi : NULL, context, q->buf,
 132                            q->buf_size, &q->ip);
 133         if (err) {
 134                 vfree(q->buf);
 135                 kfree(q);
 136                 return err;
 137         }
 138
 139         if (uresp) {
 140                 if (copy_to_user(&uresp->srq_num, &srq->srq_num,
 141                                  sizeof(uresp->srq_num))) {
 142                         rxe_queue_cleanup(q);
 143                         return -EFAULT;
 144                 }
 145         }
 146
 147         return 0;
 148 }
 149
 150 int rxe_srq_from_attr(struct rxe_dev *rxe, struct rxe_srq *srq,
 151                       struct ib_srq_attr *attr, enum ib_srq_attr_mask mask,
 152                       struct rxe_modify_srq_cmd *ucmd)
 153 {
 154         int err;
 155         struct rxe_queue *q = srq->rq.queue;
 156         struct mminfo __user *mi = NULL;
 157
 158         if (mask & IB_SRQ_MAX_WR) {
 159                 /*
 160                  * This is completely screwed up, the response is supposed to
 161                  * be in the outbuf not like this.
 162                  */
 163                 mi = u64_to_user_ptr(ucmd->mmap_info_addr);
 164
 165                 err = rxe_queue_resize(q, &attr->max_wr,
 166                                        rcv_wqe_size(srq->rq.max_sge),
 167                                        srq->rq.queue->ip ?
 168                                                 srq->rq.queue->ip->context :
 169                                                 NULL,
 170                                        mi, &srq->rq.producer_lock,
 171                                        &srq->rq.consumer_lock);
 172                 if (err)
 173                         goto err2;
 174         }
 175
 176         if (mask & IB_SRQ_LIMIT)
 177                 srq->limit = attr->srq_limit;
 178
 179         return 0;
 180
 181 err2:
 182         rxe_queue_cleanup(q);
 183         srq->rq.queue = NULL;
 184         return err;
 185 }