drivers/infiniband/hw/ipath/ipath_srq.c

   1 /*
   2  * Copyright (c) 2006 QLogic, Inc. All rights reserved.
   3  * Copyright (c) 2005, 2006 PathScale, 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/err.h>
  35 #include <linux/vmalloc.h>
  36
  37 #include "ipath_verbs.h"
  38
  39 /**
  40  * ipath_post_srq_receive - post a receive on a shared receive queue
  41  * @ibsrq: the SRQ to post the receive on
  42  * @wr: the list of work requests to post
  43  * @bad_wr: the first WR to cause a problem is put here
  44  *
  45  * This may be called from interrupt context.
  46  */
  47 int ipath_post_srq_receive(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
  48                            struct ib_recv_wr **bad_wr)
  49 {
  50         struct ipath_srq *srq = to_isrq(ibsrq);
  51         struct ipath_ibdev *dev = to_idev(ibsrq->device);
  52         unsigned long flags;
  53         int ret;
  54
  55         for (; wr; wr = wr->next) {
  56                 struct ipath_rwqe *wqe;
  57                 u32 next;
  58                 int i, j;
  59
  60                 if (wr->num_sge > srq->rq.max_sge) {
  61                         *bad_wr = wr;
  62                         ret = -ENOMEM;
  63                         goto bail;
  64                 }
  65
  66                 spin_lock_irqsave(&srq->rq.lock, flags);
  67                 next = srq->rq.head + 1;
  68                 if (next >= srq->rq.size)
  69                         next = 0;
  70                 if (next == srq->rq.tail) {
  71                         spin_unlock_irqrestore(&srq->rq.lock, flags);
  72                         *bad_wr = wr;
  73                         ret = -ENOMEM;
  74                         goto bail;
  75                 }
  76
  77                 wqe = get_rwqe_ptr(&srq->rq, srq->rq.head);
  78                 wqe->wr_id = wr->wr_id;
  79                 wqe->sg_list[0].mr = NULL;
  80                 wqe->sg_list[0].vaddr = NULL;
  81                 wqe->sg_list[0].length = 0;
  82                 wqe->sg_list[0].sge_length = 0;
  83                 wqe->length = 0;
  84                 for (i = 0, j = 0; i < wr->num_sge; i++) {
  85                         /* Check LKEY */
  86                         if (to_ipd(srq->ibsrq.pd)->user &&
  87                             wr->sg_list[i].lkey == 0) {
  88                                 spin_unlock_irqrestore(&srq->rq.lock,
  89                                                        flags);
  90                                 *bad_wr = wr;
  91                                 ret = -EINVAL;
  92                                 goto bail;
  93                         }
  94                         if (wr->sg_list[i].length == 0)
  95                                 continue;
  96                         if (!ipath_lkey_ok(&dev->lk_table,
  97                                            &wqe->sg_list[j],
  98                                            &wr->sg_list[i],
  99                                            IB_ACCESS_LOCAL_WRITE)) {
 100                                 spin_unlock_irqrestore(&srq->rq.lock,
 101                                                        flags);
 102                                 *bad_wr = wr;
 103                                 ret = -EINVAL;
 104                                 goto bail;
 105                         }
 106                         wqe->length += wr->sg_list[i].length;
 107                         j++;
 108                 }
 109                 wqe->num_sge = j;
 110                 srq->rq.head = next;
 111                 spin_unlock_irqrestore(&srq->rq.lock, flags);
 112         }
 113         ret = 0;
 114
 115 bail:
 116         return ret;
 117 }
 118
 119 /**
 120  * ipath_create_srq - create a shared receive queue
 121  * @ibpd: the protection domain of the SRQ to create
 122  * @attr: the attributes of the SRQ
 123  * @udata: not used by the InfiniPath verbs driver
 124  */
 125 struct ib_srq *ipath_create_srq(struct ib_pd *ibpd,
 126                                 struct ib_srq_init_attr *srq_init_attr,
 127                                 struct ib_udata *udata)
 128 {
 129         struct ipath_srq *srq;
 130         u32 sz;
 131         struct ib_srq *ret;
 132
 133         if (srq_init_attr->attr.max_sge < 1) {
 134                 ret = ERR_PTR(-EINVAL);
 135                 goto bail;
 136         }
 137
 138         srq = kmalloc(sizeof(*srq), GFP_KERNEL);
 139         if (!srq) {
 140                 ret = ERR_PTR(-ENOMEM);
 141                 goto bail;
 142         }
 143
 144         /*
 145          * Need to use vmalloc() if we want to support large #s of entries.
 146          */
 147         srq->rq.size = srq_init_attr->attr.max_wr + 1;
 148         sz = sizeof(struct ipath_sge) * srq_init_attr->attr.max_sge +
 149                 sizeof(struct ipath_rwqe);
 150         srq->rq.wq = vmalloc(srq->rq.size * sz);
 151         if (!srq->rq.wq) {
 152                 kfree(srq);
 153                 ret = ERR_PTR(-ENOMEM);
 154                 goto bail;
 155         }
 156
 157         /*
 158          * ib_create_srq() will initialize srq->ibsrq.
 159          */
 160         spin_lock_init(&srq->rq.lock);
 161         srq->rq.head = 0;
 162         srq->rq.tail = 0;
 163         srq->rq.max_sge = srq_init_attr->attr.max_sge;
 164         srq->limit = srq_init_attr->attr.srq_limit;
 165
 166         ret = &srq->ibsrq;
 167
 168 bail:
 169         return ret;
 170 }
 171
 172 /**
 173  * ipath_modify_srq - modify a shared receive queue
 174  * @ibsrq: the SRQ to modify
 175  * @attr: the new attributes of the SRQ
 176  * @attr_mask: indicates which attributes to modify
 177  */
 178 int ipath_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
 179                      enum ib_srq_attr_mask attr_mask)
 180 {
 181         struct ipath_srq *srq = to_isrq(ibsrq);
 182         unsigned long flags;
 183         int ret;
 184
 185         if (attr_mask & IB_SRQ_LIMIT) {
 186                 spin_lock_irqsave(&srq->rq.lock, flags);
 187                 srq->limit = attr->srq_limit;
 188                 spin_unlock_irqrestore(&srq->rq.lock, flags);
 189         }
 190         if (attr_mask & IB_SRQ_MAX_WR) {
 191                 u32 size = attr->max_wr + 1;
 192                 struct ipath_rwqe *wq, *p;
 193                 u32 n;
 194                 u32 sz;
 195
 196                 if (attr->max_sge < srq->rq.max_sge) {
 197                         ret = -EINVAL;
 198                         goto bail;
 199                 }
 200
 201                 sz = sizeof(struct ipath_rwqe) +
 202                         attr->max_sge * sizeof(struct ipath_sge);
 203                 wq = vmalloc(size * sz);
 204                 if (!wq) {
 205                         ret = -ENOMEM;
 206                         goto bail;
 207                 }
 208
 209                 spin_lock_irqsave(&srq->rq.lock, flags);
 210                 if (srq->rq.head < srq->rq.tail)
 211                         n = srq->rq.size + srq->rq.head - srq->rq.tail;
 212                 else
 213                         n = srq->rq.head - srq->rq.tail;
 214                 if (size <= n || size <= srq->limit) {
 215                         spin_unlock_irqrestore(&srq->rq.lock, flags);
 216                         vfree(wq);
 217                         ret = -EINVAL;
 218                         goto bail;
 219                 }
 220                 n = 0;
 221                 p = wq;
 222                 while (srq->rq.tail != srq->rq.head) {
 223                         struct ipath_rwqe *wqe;
 224                         int i;
 225
 226                         wqe = get_rwqe_ptr(&srq->rq, srq->rq.tail);
 227                         p->wr_id = wqe->wr_id;
 228                         p->length = wqe->length;
 229                         p->num_sge = wqe->num_sge;
 230                         for (i = 0; i < wqe->num_sge; i++)
 231                                 p->sg_list[i] = wqe->sg_list[i];
 232                         n++;
 233                         p = (struct ipath_rwqe *)((char *) p + sz);
 234                         if (++srq->rq.tail >= srq->rq.size)
 235                                 srq->rq.tail = 0;
 236                 }
 237                 vfree(srq->rq.wq);
 238                 srq->rq.wq = wq;
 239                 srq->rq.size = size;
 240                 srq->rq.head = n;
 241                 srq->rq.tail = 0;
 242                 srq->rq.max_sge = attr->max_sge;
 243                 spin_unlock_irqrestore(&srq->rq.lock, flags);
 244         }
 245
 246         ret = 0;
 247
 248 bail:
 249         return ret;
 250 }
 251
 252 int ipath_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr)
 253 {
 254         struct ipath_srq *srq = to_isrq(ibsrq);
 255
 256         attr->max_wr = srq->rq.size - 1;
 257         attr->max_sge = srq->rq.max_sge;
 258         attr->srq_limit = srq->limit;
 259         return 0;
 260 }
 261
 262 /**
 263  * ipath_destroy_srq - destroy a shared receive queue
 264  * @ibsrq: the SRQ to destroy
 265  */
 266 int ipath_destroy_srq(struct ib_srq *ibsrq)
 267 {
 268         struct ipath_srq *srq = to_isrq(ibsrq);
 269
 270         vfree(srq->rq.wq);
 271         kfree(srq);
 272
 273         return 0;
 274 }