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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
57
58
59
60
61
62int 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
93
94
95
96
97
98
99int 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
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 -EINVAL;
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(udata, ucmd.buf_addr, ucmd.buf_size, 0, 0);
150 if (IS_ERR(srq->umem)) {
151 ret = PTR_ERR(srq->umem);
152 goto err_srq;
153 }
154
155 srq->npages = ib_umem_page_count(srq->umem);
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
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
206err_page_dir:
207 pvrdma_page_dir_cleanup(dev, &srq->pdir);
208err_umem:
209 ib_umem_release(srq->umem);
210err_srq:
211 atomic_dec(&dev->num_srqs);
212
213 return ret;
214}
215
216static 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
229 ib_umem_release(srq->umem);
230
231 pvrdma_page_dir_cleanup(dev, &srq->pdir);
232
233 kfree(srq);
234
235 atomic_dec(&dev->num_srqs);
236}
237
238
239
240
241
242
243
244
245void pvrdma_destroy_srq(struct ib_srq *srq, struct ib_udata *udata)
246{
247 struct pvrdma_srq *vsrq = to_vsrq(srq);
248 union pvrdma_cmd_req req;
249 struct pvrdma_cmd_destroy_srq *cmd = &req.destroy_srq;
250 struct pvrdma_dev *dev = to_vdev(srq->device);
251 int ret;
252
253 memset(cmd, 0, sizeof(*cmd));
254 cmd->hdr.cmd = PVRDMA_CMD_DESTROY_SRQ;
255 cmd->srq_handle = vsrq->srq_handle;
256
257 ret = pvrdma_cmd_post(dev, &req, NULL, 0);
258 if (ret < 0)
259 dev_warn(&dev->pdev->dev,
260 "destroy shared receive queue failed, error: %d\n",
261 ret);
262
263 pvrdma_free_srq(dev, vsrq);
264}
265
266
267
268
269
270
271
272
273
274
275int pvrdma_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
276 enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
277{
278 struct pvrdma_srq *vsrq = to_vsrq(ibsrq);
279 union pvrdma_cmd_req req;
280 struct pvrdma_cmd_modify_srq *cmd = &req.modify_srq;
281 struct pvrdma_dev *dev = to_vdev(ibsrq->device);
282 int ret;
283
284
285 if (!(attr_mask & IB_SRQ_LIMIT))
286 return -EINVAL;
287
288 memset(cmd, 0, sizeof(*cmd));
289 cmd->hdr.cmd = PVRDMA_CMD_MODIFY_SRQ;
290 cmd->srq_handle = vsrq->srq_handle;
291 cmd->attrs.srq_limit = attr->srq_limit;
292 cmd->attr_mask = attr_mask;
293
294 ret = pvrdma_cmd_post(dev, &req, NULL, 0);
295 if (ret < 0) {
296 dev_warn(&dev->pdev->dev,
297 "could not modify shared receive queue, error: %d\n",
298 ret);
299
300 return -EINVAL;
301 }
302
303 return ret;
304}
305