1 /*
2 * Copyright (c) 2016-2017 VMware, Inc. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of EITHER the GNU General Public License
6 * version 2 as published by the Free Software Foundation or the BSD
7 * 2-Clause License. This program is distributed in the hope that it
8 * will be useful, but WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED
9 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
10 * See the GNU General Public License version 2 for more details at
11 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program available in the file COPYING in the main
15 * directory of this source tree.
16 *
17 * The BSD 2-Clause License
18 *
19 * Redistribution and use in source and binary forms, with or
20 * without modification, are permitted provided that the following
21 * conditions are met:
22 *
23 * - Redistributions of source code must retain the above
24 * copyright notice, this list of conditions and the following
25 * disclaimer.
26 *
27 * - Redistributions in binary form must reproduce the above
28 * copyright notice, this list of conditions and the following
29 * disclaimer in the documentation and/or other materials
30 * provided with the distribution.
31 *
32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
35 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
36 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
37 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
38 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
39 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
40 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
41 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
42 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
43 * OF THE POSSIBILITY OF SUCH DAMAGE.
44 */
45
46 #include <asm/page.h>
47 #include <linux/io.h>
48 #include <linux/wait.h>
49 #include <rdma/ib_addr.h>
50 #include <rdma/ib_smi.h>
51 #include <rdma/ib_user_verbs.h>
52
53 #include "pvrdma.h"
54
55 /**
56 * pvrdma_query_srq - query shared receive queue
57 * @ibsrq: the shared receive queue to query
58 * @srq_attr: attributes to query and return to client
59 *
60 * @return: 0 for success, otherwise returns an errno.
61 */
pvrdma_query_srq(struct ib_srq * ibsrq,struct ib_srq_attr * srq_attr)62 int pvrdma_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
63 {
64 struct pvrdma_dev *dev = to_vdev(ibsrq->device);
65 struct pvrdma_srq *srq = to_vsrq(ibsrq);
66 union pvrdma_cmd_req req;
67 union pvrdma_cmd_resp rsp;
68 struct pvrdma_cmd_query_srq *cmd = &req.query_srq;
69 struct pvrdma_cmd_query_srq_resp *resp = &rsp.query_srq_resp;
70 int ret;
71
72 memset(cmd, 0, sizeof(*cmd));
73 cmd->hdr.cmd = PVRDMA_CMD_QUERY_SRQ;
74 cmd->srq_handle = srq->srq_handle;
75
76 ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_QUERY_SRQ_RESP);
77 if (ret < 0) {
78 dev_warn(&dev->pdev->dev,
79 "could not query shared receive queue, error: %d\n",
80 ret);
81 return -EINVAL;
82 }
83
84 srq_attr->srq_limit = resp->attrs.srq_limit;
85 srq_attr->max_wr = resp->attrs.max_wr;
86 srq_attr->max_sge = resp->attrs.max_sge;
87
88 return 0;
89 }
90
91 /**
92 * pvrdma_create_srq - create shared receive queue
93 * @ibsrq: the IB shared receive queue
94 * @init_attr: shared receive queue attributes
95 * @udata: user data
96 *
97 * @return: 0 on success, otherwise returns an errno.
98 */
pvrdma_create_srq(struct ib_srq * ibsrq,struct ib_srq_init_attr * init_attr,struct ib_udata * udata)99 int pvrdma_create_srq(struct ib_srq *ibsrq, struct ib_srq_init_attr *init_attr,
100 struct ib_udata *udata)
101 {
102 struct pvrdma_srq *srq = to_vsrq(ibsrq);
103 struct pvrdma_dev *dev = to_vdev(ibsrq->device);
104 union pvrdma_cmd_req req;
105 union pvrdma_cmd_resp rsp;
106 struct pvrdma_cmd_create_srq *cmd = &req.create_srq;
107 struct pvrdma_cmd_create_srq_resp *resp = &rsp.create_srq_resp;
108 struct pvrdma_create_srq_resp srq_resp = {};
109 struct pvrdma_create_srq ucmd;
110 unsigned long flags;
111 int ret;
112
113 if (!udata) {
114 /* No support for kernel clients. */
115 dev_warn(&dev->pdev->dev,
116 "no shared receive queue support for kernel client\n");
117 return -EOPNOTSUPP;
118 }
119
120 if (init_attr->srq_type != IB_SRQT_BASIC) {
121 dev_warn(&dev->pdev->dev,
122 "shared receive queue type %d not supported\n",
123 init_attr->srq_type);
124 return -EOPNOTSUPP;
125 }
126
127 if (init_attr->attr.max_wr > dev->dsr->caps.max_srq_wr ||
128 init_attr->attr.max_sge > dev->dsr->caps.max_srq_sge) {
129 dev_warn(&dev->pdev->dev,
130 "shared receive queue size invalid\n");
131 return -EINVAL;
132 }
133
134 if (!atomic_add_unless(&dev->num_srqs, 1, dev->dsr->caps.max_srq))
135 return -ENOMEM;
136
137 spin_lock_init(&srq->lock);
138 refcount_set(&srq->refcnt, 1);
139 init_completion(&srq->free);
140
141 dev_dbg(&dev->pdev->dev,
142 "create shared receive queue from user space\n");
143
144 if (ib_copy_from_udata(&ucmd, udata, sizeof(ucmd))) {
145 ret = -EFAULT;
146 goto err_srq;
147 }
148
149 srq->umem = ib_umem_get(ibsrq->device, ucmd.buf_addr, ucmd.buf_size, 0);
150 if (IS_ERR(srq->umem)) {
151 ret = PTR_ERR(srq->umem);
152 goto err_srq;
153 }
154
155 srq->npages = ib_umem_num_dma_blocks(srq->umem, PAGE_SIZE);
156
157 if (srq->npages < 0 || srq->npages > PVRDMA_PAGE_DIR_MAX_PAGES) {
158 dev_warn(&dev->pdev->dev,
159 "overflow pages in shared receive queue\n");
160 ret = -EINVAL;
161 goto err_umem;
162 }
163
164 ret = pvrdma_page_dir_init(dev, &srq->pdir, srq->npages, false);
165 if (ret) {
166 dev_warn(&dev->pdev->dev,
167 "could not allocate page directory\n");
168 goto err_umem;
169 }
170
171 pvrdma_page_dir_insert_umem(&srq->pdir, srq->umem, 0);
172
173 memset(cmd, 0, sizeof(*cmd));
174 cmd->hdr.cmd = PVRDMA_CMD_CREATE_SRQ;
175 cmd->srq_type = init_attr->srq_type;
176 cmd->nchunks = srq->npages;
177 cmd->pd_handle = to_vpd(ibsrq->pd)->pd_handle;
178 cmd->attrs.max_wr = init_attr->attr.max_wr;
179 cmd->attrs.max_sge = init_attr->attr.max_sge;
180 cmd->attrs.srq_limit = init_attr->attr.srq_limit;
181 cmd->pdir_dma = srq->pdir.dir_dma;
182
183 ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_SRQ_RESP);
184 if (ret < 0) {
185 dev_warn(&dev->pdev->dev,
186 "could not create shared receive queue, error: %d\n",
187 ret);
188 goto err_page_dir;
189 }
190
191 srq->srq_handle = resp->srqn;
192 srq_resp.srqn = resp->srqn;
193 spin_lock_irqsave(&dev->srq_tbl_lock, flags);
194 dev->srq_tbl[srq->srq_handle % dev->dsr->caps.max_srq] = srq;
195 spin_unlock_irqrestore(&dev->srq_tbl_lock, flags);
196
197 /* Copy udata back. */
198 if (ib_copy_to_udata(udata, &srq_resp, sizeof(srq_resp))) {
199 dev_warn(&dev->pdev->dev, "failed to copy back udata\n");
200 pvrdma_destroy_srq(&srq->ibsrq, udata);
201 return -EINVAL;
202 }
203
204 return 0;
205
206 err_page_dir:
207 pvrdma_page_dir_cleanup(dev, &srq->pdir);
208 err_umem:
209 ib_umem_release(srq->umem);
210 err_srq:
211 atomic_dec(&dev->num_srqs);
212
213 return ret;
214 }
215
pvrdma_free_srq(struct pvrdma_dev * dev,struct pvrdma_srq * srq)216 static void pvrdma_free_srq(struct pvrdma_dev *dev, struct pvrdma_srq *srq)
217 {
218 unsigned long flags;
219
220 spin_lock_irqsave(&dev->srq_tbl_lock, flags);
221 dev->srq_tbl[srq->srq_handle] = NULL;
222 spin_unlock_irqrestore(&dev->srq_tbl_lock, flags);
223
224 if (refcount_dec_and_test(&srq->refcnt))
225 complete(&srq->free);
226 wait_for_completion(&srq->free);
227
228 /* There is no support for kernel clients, so this is safe. */
229 ib_umem_release(srq->umem);
230
231 pvrdma_page_dir_cleanup(dev, &srq->pdir);
232
233 atomic_dec(&dev->num_srqs);
234 }
235
236 /**
237 * pvrdma_destroy_srq - destroy shared receive queue
238 * @srq: the shared receive queue to destroy
239 * @udata: user data or null for kernel object
240 *
241 * @return: 0 for success.
242 */
pvrdma_destroy_srq(struct ib_srq * srq,struct ib_udata * udata)243 int pvrdma_destroy_srq(struct ib_srq *srq, struct ib_udata *udata)
244 {
245 struct pvrdma_srq *vsrq = to_vsrq(srq);
246 union pvrdma_cmd_req req;
247 struct pvrdma_cmd_destroy_srq *cmd = &req.destroy_srq;
248 struct pvrdma_dev *dev = to_vdev(srq->device);
249 int ret;
250
251 memset(cmd, 0, sizeof(*cmd));
252 cmd->hdr.cmd = PVRDMA_CMD_DESTROY_SRQ;
253 cmd->srq_handle = vsrq->srq_handle;
254
255 ret = pvrdma_cmd_post(dev, &req, NULL, 0);
256 if (ret < 0)
257 dev_warn(&dev->pdev->dev,
258 "destroy shared receive queue failed, error: %d\n",
259 ret);
260
261 pvrdma_free_srq(dev, vsrq);
262 return 0;
263 }
264
265 /**
266 * pvrdma_modify_srq - modify shared receive queue attributes
267 * @ibsrq: the shared receive queue to modify
268 * @attr: the shared receive queue's new attributes
269 * @attr_mask: attributes mask
270 * @udata: user data
271 *
272 * @returns 0 on success, otherwise returns an errno.
273 */
pvrdma_modify_srq(struct ib_srq * ibsrq,struct ib_srq_attr * attr,enum ib_srq_attr_mask attr_mask,struct ib_udata * udata)274 int pvrdma_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
275 enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
276 {
277 struct pvrdma_srq *vsrq = to_vsrq(ibsrq);
278 union pvrdma_cmd_req req;
279 struct pvrdma_cmd_modify_srq *cmd = &req.modify_srq;
280 struct pvrdma_dev *dev = to_vdev(ibsrq->device);
281 int ret;
282
283 /* Only support SRQ limit. */
284 if (!(attr_mask & IB_SRQ_LIMIT))
285 return -EINVAL;
286
287 memset(cmd, 0, sizeof(*cmd));
288 cmd->hdr.cmd = PVRDMA_CMD_MODIFY_SRQ;
289 cmd->srq_handle = vsrq->srq_handle;
290 cmd->attrs.srq_limit = attr->srq_limit;
291 cmd->attr_mask = attr_mask;
292
293 ret = pvrdma_cmd_post(dev, &req, NULL, 0);
294 if (ret < 0) {
295 dev_warn(&dev->pdev->dev,
296 "could not modify shared receive queue, error: %d\n",
297 ret);
298
299 return -EINVAL;
300 }
301
302 return ret;
303 }
304