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34#include <linux/mlx4/qp.h>
35#include <linux/mlx4/srq.h>
36#include <linux/slab.h>
37#include <linux/vmalloc.h>
38
39#include "mlx4_ib.h"
40#include <rdma/mlx4-abi.h>
41
42static void *get_wqe(struct mlx4_ib_srq *srq, int n)
43{
44 return mlx4_buf_offset(&srq->buf, n << srq->msrq.wqe_shift);
45}
46
47static void mlx4_ib_srq_event(struct mlx4_srq *srq, enum mlx4_event type)
48{
49 struct ib_event event;
50 struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq;
51
52 if (ibsrq->event_handler) {
53 event.device = ibsrq->device;
54 event.element.srq = ibsrq;
55 switch (type) {
56 case MLX4_EVENT_TYPE_SRQ_LIMIT:
57 event.event = IB_EVENT_SRQ_LIMIT_REACHED;
58 break;
59 case MLX4_EVENT_TYPE_SRQ_CATAS_ERROR:
60 event.event = IB_EVENT_SRQ_ERR;
61 break;
62 default:
63 pr_warn("Unexpected event type %d "
64 "on SRQ %06x\n", type, srq->srqn);
65 return;
66 }
67
68 ibsrq->event_handler(&event, ibsrq->srq_context);
69 }
70}
71
72struct ib_srq *mlx4_ib_create_srq(struct ib_pd *pd,
73 struct ib_srq_init_attr *init_attr,
74 struct ib_udata *udata)
75{
76 struct mlx4_ib_dev *dev = to_mdev(pd->device);
77 struct mlx4_ib_srq *srq;
78 struct mlx4_wqe_srq_next_seg *next;
79 struct mlx4_wqe_data_seg *scatter;
80 u32 cqn;
81 u16 xrcdn;
82 int desc_size;
83 int buf_size;
84 int err;
85 int i;
86
87
88 if (init_attr->attr.max_wr >= dev->dev->caps.max_srq_wqes ||
89 init_attr->attr.max_sge > dev->dev->caps.max_srq_sge)
90 return ERR_PTR(-EINVAL);
91
92 srq = kmalloc(sizeof *srq, GFP_KERNEL);
93 if (!srq)
94 return ERR_PTR(-ENOMEM);
95
96 mutex_init(&srq->mutex);
97 spin_lock_init(&srq->lock);
98 srq->msrq.max = roundup_pow_of_two(init_attr->attr.max_wr + 1);
99 srq->msrq.max_gs = init_attr->attr.max_sge;
100
101 desc_size = max(32UL,
102 roundup_pow_of_two(sizeof (struct mlx4_wqe_srq_next_seg) +
103 srq->msrq.max_gs *
104 sizeof (struct mlx4_wqe_data_seg)));
105 srq->msrq.wqe_shift = ilog2(desc_size);
106
107 buf_size = srq->msrq.max * desc_size;
108
109 if (pd->uobject) {
110 struct mlx4_ib_create_srq ucmd;
111
112 if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
113 err = -EFAULT;
114 goto err_srq;
115 }
116
117 srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr,
118 buf_size, 0, 0);
119 if (IS_ERR(srq->umem)) {
120 err = PTR_ERR(srq->umem);
121 goto err_srq;
122 }
123
124 err = mlx4_mtt_init(dev->dev, ib_umem_page_count(srq->umem),
125 ilog2(srq->umem->page_size), &srq->mtt);
126 if (err)
127 goto err_buf;
128
129 err = mlx4_ib_umem_write_mtt(dev, &srq->mtt, srq->umem);
130 if (err)
131 goto err_mtt;
132
133 err = mlx4_ib_db_map_user(to_mucontext(pd->uobject->context),
134 ucmd.db_addr, &srq->db);
135 if (err)
136 goto err_mtt;
137 } else {
138 err = mlx4_db_alloc(dev->dev, &srq->db, 0, GFP_KERNEL);
139 if (err)
140 goto err_srq;
141
142 *srq->db.db = 0;
143
144 if (mlx4_buf_alloc(dev->dev, buf_size, PAGE_SIZE * 2, &srq->buf,
145 GFP_KERNEL)) {
146 err = -ENOMEM;
147 goto err_db;
148 }
149
150 srq->head = 0;
151 srq->tail = srq->msrq.max - 1;
152 srq->wqe_ctr = 0;
153
154 for (i = 0; i < srq->msrq.max; ++i) {
155 next = get_wqe(srq, i);
156 next->next_wqe_index =
157 cpu_to_be16((i + 1) & (srq->msrq.max - 1));
158
159 for (scatter = (void *) (next + 1);
160 (void *) scatter < (void *) next + desc_size;
161 ++scatter)
162 scatter->lkey = cpu_to_be32(MLX4_INVALID_LKEY);
163 }
164
165 err = mlx4_mtt_init(dev->dev, srq->buf.npages, srq->buf.page_shift,
166 &srq->mtt);
167 if (err)
168 goto err_buf;
169
170 err = mlx4_buf_write_mtt(dev->dev, &srq->mtt, &srq->buf, GFP_KERNEL);
171 if (err)
172 goto err_mtt;
173
174 srq->wrid = kmalloc_array(srq->msrq.max, sizeof(u64),
175 GFP_KERNEL | __GFP_NOWARN);
176 if (!srq->wrid) {
177 srq->wrid = __vmalloc(srq->msrq.max * sizeof(u64),
178 GFP_KERNEL, PAGE_KERNEL);
179 if (!srq->wrid) {
180 err = -ENOMEM;
181 goto err_mtt;
182 }
183 }
184 }
185
186 cqn = (init_attr->srq_type == IB_SRQT_XRC) ?
187 to_mcq(init_attr->ext.xrc.cq)->mcq.cqn : 0;
188 xrcdn = (init_attr->srq_type == IB_SRQT_XRC) ?
189 to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn :
190 (u16) dev->dev->caps.reserved_xrcds;
191 err = mlx4_srq_alloc(dev->dev, to_mpd(pd)->pdn, cqn, xrcdn, &srq->mtt,
192 srq->db.dma, &srq->msrq);
193 if (err)
194 goto err_wrid;
195
196 srq->msrq.event = mlx4_ib_srq_event;
197 srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn;
198
199 if (pd->uobject)
200 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
201 err = -EFAULT;
202 goto err_wrid;
203 }
204
205 init_attr->attr.max_wr = srq->msrq.max - 1;
206
207 return &srq->ibsrq;
208
209err_wrid:
210 if (pd->uobject)
211 mlx4_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db);
212 else
213 kvfree(srq->wrid);
214
215err_mtt:
216 mlx4_mtt_cleanup(dev->dev, &srq->mtt);
217
218err_buf:
219 if (pd->uobject)
220 ib_umem_release(srq->umem);
221 else
222 mlx4_buf_free(dev->dev, buf_size, &srq->buf);
223
224err_db:
225 if (!pd->uobject)
226 mlx4_db_free(dev->dev, &srq->db);
227
228err_srq:
229 kfree(srq);
230
231 return ERR_PTR(err);
232}
233
234int mlx4_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
235 enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
236{
237 struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
238 struct mlx4_ib_srq *srq = to_msrq(ibsrq);
239 int ret;
240
241
242 if (attr_mask & IB_SRQ_MAX_WR)
243 return -EINVAL;
244
245 if (attr_mask & IB_SRQ_LIMIT) {
246 if (attr->srq_limit >= srq->msrq.max)
247 return -EINVAL;
248
249 mutex_lock(&srq->mutex);
250 ret = mlx4_srq_arm(dev->dev, &srq->msrq, attr->srq_limit);
251 mutex_unlock(&srq->mutex);
252
253 if (ret)
254 return ret;
255 }
256
257 return 0;
258}
259
260int mlx4_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
261{
262 struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
263 struct mlx4_ib_srq *srq = to_msrq(ibsrq);
264 int ret;
265 int limit_watermark;
266
267 ret = mlx4_srq_query(dev->dev, &srq->msrq, &limit_watermark);
268 if (ret)
269 return ret;
270
271 srq_attr->srq_limit = limit_watermark;
272 srq_attr->max_wr = srq->msrq.max - 1;
273 srq_attr->max_sge = srq->msrq.max_gs;
274
275 return 0;
276}
277
278int mlx4_ib_destroy_srq(struct ib_srq *srq)
279{
280 struct mlx4_ib_dev *dev = to_mdev(srq->device);
281 struct mlx4_ib_srq *msrq = to_msrq(srq);
282
283 mlx4_srq_free(dev->dev, &msrq->msrq);
284 mlx4_mtt_cleanup(dev->dev, &msrq->mtt);
285
286 if (srq->uobject) {
287 mlx4_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db);
288 ib_umem_release(msrq->umem);
289 } else {
290 kvfree(msrq->wrid);
291 mlx4_buf_free(dev->dev, msrq->msrq.max << msrq->msrq.wqe_shift,
292 &msrq->buf);
293 mlx4_db_free(dev->dev, &msrq->db);
294 }
295
296 kfree(msrq);
297
298 return 0;
299}
300
301void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index)
302{
303 struct mlx4_wqe_srq_next_seg *next;
304
305
306 spin_lock(&srq->lock);
307
308 next = get_wqe(srq, srq->tail);
309 next->next_wqe_index = cpu_to_be16(wqe_index);
310 srq->tail = wqe_index;
311
312 spin_unlock(&srq->lock);
313}
314
315int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
316 struct ib_recv_wr **bad_wr)
317{
318 struct mlx4_ib_srq *srq = to_msrq(ibsrq);
319 struct mlx4_wqe_srq_next_seg *next;
320 struct mlx4_wqe_data_seg *scat;
321 unsigned long flags;
322 int err = 0;
323 int nreq;
324 int i;
325 struct mlx4_ib_dev *mdev = to_mdev(ibsrq->device);
326
327 spin_lock_irqsave(&srq->lock, flags);
328 if (mdev->dev->persist->state & MLX4_DEVICE_STATE_INTERNAL_ERROR) {
329 err = -EIO;
330 *bad_wr = wr;
331 nreq = 0;
332 goto out;
333 }
334
335 for (nreq = 0; wr; ++nreq, wr = wr->next) {
336 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
337 err = -EINVAL;
338 *bad_wr = wr;
339 break;
340 }
341
342 if (unlikely(srq->head == srq->tail)) {
343 err = -ENOMEM;
344 *bad_wr = wr;
345 break;
346 }
347
348 srq->wrid[srq->head] = wr->wr_id;
349
350 next = get_wqe(srq, srq->head);
351 srq->head = be16_to_cpu(next->next_wqe_index);
352 scat = (struct mlx4_wqe_data_seg *) (next + 1);
353
354 for (i = 0; i < wr->num_sge; ++i) {
355 scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
356 scat[i].lkey = cpu_to_be32(wr->sg_list[i].lkey);
357 scat[i].addr = cpu_to_be64(wr->sg_list[i].addr);
358 }
359
360 if (i < srq->msrq.max_gs) {
361 scat[i].byte_count = 0;
362 scat[i].lkey = cpu_to_be32(MLX4_INVALID_LKEY);
363 scat[i].addr = 0;
364 }
365 }
366
367 if (likely(nreq)) {
368 srq->wqe_ctr += nreq;
369
370
371
372
373
374 wmb();
375
376 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
377 }
378out:
379
380 spin_unlock_irqrestore(&srq->lock, flags);
381
382 return err;
383}
384
