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34#include <linux/mlx4/qp.h>
35#include <linux/mlx4/srq.h>
36
37#include "mlx4_ib.h"
38#include "user.h"
39
40static void *get_wqe(struct mlx4_ib_srq *srq, int n)
41{
42 return mlx4_buf_offset(&srq->buf, n << srq->msrq.wqe_shift);
43}
44
45static void mlx4_ib_srq_event(struct mlx4_srq *srq, enum mlx4_event type)
46{
47 struct ib_event event;
48 struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq;
49
50 if (ibsrq->event_handler) {
51 event.device = ibsrq->device;
52 event.element.srq = ibsrq;
53 switch (type) {
54 case MLX4_EVENT_TYPE_SRQ_LIMIT:
55 event.event = IB_EVENT_SRQ_LIMIT_REACHED;
56 break;
57 case MLX4_EVENT_TYPE_SRQ_CATAS_ERROR:
58 event.event = IB_EVENT_SRQ_ERR;
59 break;
60 default:
61 printk(KERN_WARNING "mlx4_ib: Unexpected event type %d "
62 "on SRQ %06x\n", type, srq->srqn);
63 return;
64 }
65
66 ibsrq->event_handler(&event, ibsrq->srq_context);
67 }
68}
69
70struct ib_srq *mlx4_ib_create_srq(struct ib_pd *pd,
71 struct ib_srq_init_attr *init_attr,
72 struct ib_udata *udata)
73{
74 struct mlx4_ib_dev *dev = to_mdev(pd->device);
75 struct mlx4_ib_srq *srq;
76 struct mlx4_wqe_srq_next_seg *next;
77 int desc_size;
78 int buf_size;
79 int err;
80 int i;
81
82
83 if (init_attr->attr.max_wr >= dev->dev->caps.max_srq_wqes ||
84 init_attr->attr.max_sge > dev->dev->caps.max_srq_sge)
85 return ERR_PTR(-EINVAL);
86
87 srq = kmalloc(sizeof *srq, GFP_KERNEL);
88 if (!srq)
89 return ERR_PTR(-ENOMEM);
90
91 mutex_init(&srq->mutex);
92 spin_lock_init(&srq->lock);
93 srq->msrq.max = roundup_pow_of_two(init_attr->attr.max_wr + 1);
94 srq->msrq.max_gs = init_attr->attr.max_sge;
95
96 desc_size = max(32UL,
97 roundup_pow_of_two(sizeof (struct mlx4_wqe_srq_next_seg) +
98 srq->msrq.max_gs *
99 sizeof (struct mlx4_wqe_data_seg)));
100 srq->msrq.wqe_shift = ilog2(desc_size);
101
102 buf_size = srq->msrq.max * desc_size;
103
104 if (pd->uobject) {
105 struct mlx4_ib_create_srq ucmd;
106
107 if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
108 err = -EFAULT;
109 goto err_srq;
110 }
111
112 srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr,
113 buf_size, 0, 0);
114 if (IS_ERR(srq->umem)) {
115 err = PTR_ERR(srq->umem);
116 goto err_srq;
117 }
118
119 err = mlx4_mtt_init(dev->dev, ib_umem_page_count(srq->umem),
120 ilog2(srq->umem->page_size), &srq->mtt);
121 if (err)
122 goto err_buf;
123
124 err = mlx4_ib_umem_write_mtt(dev, &srq->mtt, srq->umem);
125 if (err)
126 goto err_mtt;
127
128 err = mlx4_ib_db_map_user(to_mucontext(pd->uobject->context),
129 ucmd.db_addr, &srq->db);
130 if (err)
131 goto err_mtt;
132 } else {
133 err = mlx4_db_alloc(dev->dev, &srq->db, 0);
134 if (err)
135 goto err_srq;
136
137 *srq->db.db = 0;
138
139 if (mlx4_buf_alloc(dev->dev, buf_size, PAGE_SIZE * 2, &srq->buf)) {
140 err = -ENOMEM;
141 goto err_db;
142 }
143
144 srq->head = 0;
145 srq->tail = srq->msrq.max - 1;
146 srq->wqe_ctr = 0;
147
148 for (i = 0; i < srq->msrq.max; ++i) {
149 next = get_wqe(srq, i);
150 next->next_wqe_index =
151 cpu_to_be16((i + 1) & (srq->msrq.max - 1));
152 }
153
154 err = mlx4_mtt_init(dev->dev, srq->buf.npages, srq->buf.page_shift,
155 &srq->mtt);
156 if (err)
157 goto err_buf;
158
159 err = mlx4_buf_write_mtt(dev->dev, &srq->mtt, &srq->buf);
160 if (err)
161 goto err_mtt;
162
163 srq->wrid = kmalloc(srq->msrq.max * sizeof (u64), GFP_KERNEL);
164 if (!srq->wrid) {
165 err = -ENOMEM;
166 goto err_mtt;
167 }
168 }
169
170 err = mlx4_srq_alloc(dev->dev, to_mpd(pd)->pdn, &srq->mtt,
171 srq->db.dma, &srq->msrq);
172 if (err)
173 goto err_wrid;
174
175 srq->msrq.event = mlx4_ib_srq_event;
176
177 if (pd->uobject)
178 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
179 err = -EFAULT;
180 goto err_wrid;
181 }
182
183 init_attr->attr.max_wr = srq->msrq.max - 1;
184
185 return &srq->ibsrq;
186
187err_wrid:
188 if (pd->uobject)
189 mlx4_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db);
190 else
191 kfree(srq->wrid);
192
193err_mtt:
194 mlx4_mtt_cleanup(dev->dev, &srq->mtt);
195
196err_buf:
197 if (pd->uobject)
198 ib_umem_release(srq->umem);
199 else
200 mlx4_buf_free(dev->dev, buf_size, &srq->buf);
201
202err_db:
203 if (!pd->uobject)
204 mlx4_db_free(dev->dev, &srq->db);
205
206err_srq:
207 kfree(srq);
208
209 return ERR_PTR(err);
210}
211
212int mlx4_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
213 enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
214{
215 struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
216 struct mlx4_ib_srq *srq = to_msrq(ibsrq);
217 int ret;
218
219
220 if (attr_mask & IB_SRQ_MAX_WR)
221 return -EINVAL;
222
223 if (attr_mask & IB_SRQ_LIMIT) {
224 if (attr->srq_limit >= srq->msrq.max)
225 return -EINVAL;
226
227 mutex_lock(&srq->mutex);
228 ret = mlx4_srq_arm(dev->dev, &srq->msrq, attr->srq_limit);
229 mutex_unlock(&srq->mutex);
230
231 if (ret)
232 return ret;
233 }
234
235 return 0;
236}
237
238int mlx4_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
239{
240 struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
241 struct mlx4_ib_srq *srq = to_msrq(ibsrq);
242 int ret;
243 int limit_watermark;
244
245 ret = mlx4_srq_query(dev->dev, &srq->msrq, &limit_watermark);
246 if (ret)
247 return ret;
248
249 srq_attr->srq_limit = limit_watermark;
250 srq_attr->max_wr = srq->msrq.max - 1;
251 srq_attr->max_sge = srq->msrq.max_gs;
252
253 return 0;
254}
255
256int mlx4_ib_destroy_srq(struct ib_srq *srq)
257{
258 struct mlx4_ib_dev *dev = to_mdev(srq->device);
259 struct mlx4_ib_srq *msrq = to_msrq(srq);
260
261 mlx4_srq_free(dev->dev, &msrq->msrq);
262 mlx4_mtt_cleanup(dev->dev, &msrq->mtt);
263
264 if (srq->uobject) {
265 mlx4_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db);
266 ib_umem_release(msrq->umem);
267 } else {
268 kfree(msrq->wrid);
269 mlx4_buf_free(dev->dev, msrq->msrq.max << msrq->msrq.wqe_shift,
270 &msrq->buf);
271 mlx4_db_free(dev->dev, &msrq->db);
272 }
273
274 kfree(msrq);
275
276 return 0;
277}
278
279void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index)
280{
281 struct mlx4_wqe_srq_next_seg *next;
282
283
284 spin_lock(&srq->lock);
285
286 next = get_wqe(srq, srq->tail);
287 next->next_wqe_index = cpu_to_be16(wqe_index);
288 srq->tail = wqe_index;
289
290 spin_unlock(&srq->lock);
291}
292
293int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
294 struct ib_recv_wr **bad_wr)
295{
296 struct mlx4_ib_srq *srq = to_msrq(ibsrq);
297 struct mlx4_wqe_srq_next_seg *next;
298 struct mlx4_wqe_data_seg *scat;
299 unsigned long flags;
300 int err = 0;
301 int nreq;
302 int i;
303
304 spin_lock_irqsave(&srq->lock, flags);
305
306 for (nreq = 0; wr; ++nreq, wr = wr->next) {
307 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
308 err = -EINVAL;
309 *bad_wr = wr;
310 break;
311 }
312
313 if (unlikely(srq->head == srq->tail)) {
314 err = -ENOMEM;
315 *bad_wr = wr;
316 break;
317 }
318
319 srq->wrid[srq->head] = wr->wr_id;
320
321 next = get_wqe(srq, srq->head);
322 srq->head = be16_to_cpu(next->next_wqe_index);
323 scat = (struct mlx4_wqe_data_seg *) (next + 1);
324
325 for (i = 0; i < wr->num_sge; ++i) {
326 scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
327 scat[i].lkey = cpu_to_be32(wr->sg_list[i].lkey);
328 scat[i].addr = cpu_to_be64(wr->sg_list[i].addr);
329 }
330
331 if (i < srq->msrq.max_gs) {
332 scat[i].byte_count = 0;
333 scat[i].lkey = cpu_to_be32(MLX4_INVALID_LKEY);
334 scat[i].addr = 0;
335 }
336 }
337
338 if (likely(nreq)) {
339 srq->wqe_ctr += nreq;
340
341
342
343
344
345 wmb();
346
347 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
348 }
349
350 spin_unlock_irqrestore(&srq->lock, flags);
351
352 return err;
353}
354
