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225c7b1f RD |
1 | /* |
2 | * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved. | |
51a379d0 | 3 | * Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved. |
225c7b1f RD |
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/mlx4/qp.h> | |
35 | #include <linux/mlx4/srq.h> | |
5a0e3ad6 | 36 | #include <linux/slab.h> |
225c7b1f RD |
37 | |
38 | #include "mlx4_ib.h" | |
39 | #include "user.h" | |
40 | ||
41 | static void *get_wqe(struct mlx4_ib_srq *srq, int n) | |
42 | { | |
1c69fc2a | 43 | return mlx4_buf_offset(&srq->buf, n << srq->msrq.wqe_shift); |
225c7b1f RD |
44 | } |
45 | ||
46 | static void mlx4_ib_srq_event(struct mlx4_srq *srq, enum mlx4_event type) | |
47 | { | |
48 | struct ib_event event; | |
49 | struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq; | |
50 | ||
51 | if (ibsrq->event_handler) { | |
52 | event.device = ibsrq->device; | |
53 | event.element.srq = ibsrq; | |
54 | switch (type) { | |
55 | case MLX4_EVENT_TYPE_SRQ_LIMIT: | |
56 | event.event = IB_EVENT_SRQ_LIMIT_REACHED; | |
57 | break; | |
58 | case MLX4_EVENT_TYPE_SRQ_CATAS_ERROR: | |
59 | event.event = IB_EVENT_SRQ_ERR; | |
60 | break; | |
61 | default: | |
987c8f8f | 62 | pr_warn("Unexpected event type %d " |
225c7b1f RD |
63 | "on SRQ %06x\n", type, srq->srqn); |
64 | return; | |
65 | } | |
66 | ||
67 | ibsrq->event_handler(&event, ibsrq->srq_context); | |
68 | } | |
69 | } | |
70 | ||
71 | struct ib_srq *mlx4_ib_create_srq(struct ib_pd *pd, | |
72 | struct ib_srq_init_attr *init_attr, | |
73 | struct ib_udata *udata) | |
74 | { | |
75 | struct mlx4_ib_dev *dev = to_mdev(pd->device); | |
76 | struct mlx4_ib_srq *srq; | |
77 | struct mlx4_wqe_srq_next_seg *next; | |
4c425588 | 78 | struct mlx4_wqe_data_seg *scatter; |
18abd5ea SH |
79 | u32 cqn; |
80 | u16 xrcdn; | |
225c7b1f RD |
81 | int desc_size; |
82 | int buf_size; | |
83 | int err; | |
84 | int i; | |
85 | ||
86 | /* Sanity check SRQ size before proceeding */ | |
87 | if (init_attr->attr.max_wr >= dev->dev->caps.max_srq_wqes || | |
88 | init_attr->attr.max_sge > dev->dev->caps.max_srq_sge) | |
89 | return ERR_PTR(-EINVAL); | |
90 | ||
91 | srq = kmalloc(sizeof *srq, GFP_KERNEL); | |
92 | if (!srq) | |
93 | return ERR_PTR(-ENOMEM); | |
94 | ||
95 | mutex_init(&srq->mutex); | |
96 | spin_lock_init(&srq->lock); | |
97 | srq->msrq.max = roundup_pow_of_two(init_attr->attr.max_wr + 1); | |
98 | srq->msrq.max_gs = init_attr->attr.max_sge; | |
99 | ||
100 | desc_size = max(32UL, | |
101 | roundup_pow_of_two(sizeof (struct mlx4_wqe_srq_next_seg) + | |
102 | srq->msrq.max_gs * | |
103 | sizeof (struct mlx4_wqe_data_seg))); | |
104 | srq->msrq.wqe_shift = ilog2(desc_size); | |
105 | ||
106 | buf_size = srq->msrq.max * desc_size; | |
107 | ||
108 | if (pd->uobject) { | |
109 | struct mlx4_ib_create_srq ucmd; | |
110 | ||
111 | if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) { | |
112 | err = -EFAULT; | |
113 | goto err_srq; | |
114 | } | |
115 | ||
116 | srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr, | |
cb9fbc5c | 117 | buf_size, 0, 0); |
225c7b1f RD |
118 | if (IS_ERR(srq->umem)) { |
119 | err = PTR_ERR(srq->umem); | |
120 | goto err_srq; | |
121 | } | |
122 | ||
123 | err = mlx4_mtt_init(dev->dev, ib_umem_page_count(srq->umem), | |
124 | ilog2(srq->umem->page_size), &srq->mtt); | |
125 | if (err) | |
126 | goto err_buf; | |
127 | ||
128 | err = mlx4_ib_umem_write_mtt(dev, &srq->mtt, srq->umem); | |
129 | if (err) | |
130 | goto err_mtt; | |
131 | ||
132 | err = mlx4_ib_db_map_user(to_mucontext(pd->uobject->context), | |
133 | ucmd.db_addr, &srq->db); | |
134 | if (err) | |
135 | goto err_mtt; | |
136 | } else { | |
40f2287b | 137 | err = mlx4_db_alloc(dev->dev, &srq->db, 0, GFP_KERNEL); |
225c7b1f RD |
138 | if (err) |
139 | goto err_srq; | |
140 | ||
141 | *srq->db.db = 0; | |
142 | ||
40f2287b JK |
143 | if (mlx4_buf_alloc(dev->dev, buf_size, PAGE_SIZE * 2, &srq->buf, |
144 | GFP_KERNEL)) { | |
225c7b1f RD |
145 | err = -ENOMEM; |
146 | goto err_db; | |
147 | } | |
148 | ||
149 | srq->head = 0; | |
150 | srq->tail = srq->msrq.max - 1; | |
151 | srq->wqe_ctr = 0; | |
152 | ||
153 | for (i = 0; i < srq->msrq.max; ++i) { | |
154 | next = get_wqe(srq, i); | |
155 | next->next_wqe_index = | |
156 | cpu_to_be16((i + 1) & (srq->msrq.max - 1)); | |
4c425588 JM |
157 | |
158 | for (scatter = (void *) (next + 1); | |
159 | (void *) scatter < (void *) next + desc_size; | |
160 | ++scatter) | |
161 | scatter->lkey = cpu_to_be32(MLX4_INVALID_LKEY); | |
225c7b1f RD |
162 | } |
163 | ||
164 | err = mlx4_mtt_init(dev->dev, srq->buf.npages, srq->buf.page_shift, | |
165 | &srq->mtt); | |
166 | if (err) | |
167 | goto err_buf; | |
168 | ||
40f2287b | 169 | err = mlx4_buf_write_mtt(dev->dev, &srq->mtt, &srq->buf, GFP_KERNEL); |
225c7b1f RD |
170 | if (err) |
171 | goto err_mtt; | |
172 | ||
173 | srq->wrid = kmalloc(srq->msrq.max * sizeof (u64), GFP_KERNEL); | |
174 | if (!srq->wrid) { | |
175 | err = -ENOMEM; | |
176 | goto err_mtt; | |
177 | } | |
178 | } | |
179 | ||
18abd5ea SH |
180 | cqn = (init_attr->srq_type == IB_SRQT_XRC) ? |
181 | to_mcq(init_attr->ext.xrc.cq)->mcq.cqn : 0; | |
182 | xrcdn = (init_attr->srq_type == IB_SRQT_XRC) ? | |
183 | to_mxrcd(init_attr->ext.xrc.xrcd)->xrcdn : | |
184 | (u16) dev->dev->caps.reserved_xrcds; | |
185 | err = mlx4_srq_alloc(dev->dev, to_mpd(pd)->pdn, cqn, xrcdn, &srq->mtt, | |
225c7b1f RD |
186 | srq->db.dma, &srq->msrq); |
187 | if (err) | |
188 | goto err_wrid; | |
189 | ||
190 | srq->msrq.event = mlx4_ib_srq_event; | |
18abd5ea | 191 | srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn; |
225c7b1f RD |
192 | |
193 | if (pd->uobject) | |
194 | if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) { | |
195 | err = -EFAULT; | |
196 | goto err_wrid; | |
197 | } | |
198 | ||
199 | init_attr->attr.max_wr = srq->msrq.max - 1; | |
200 | ||
201 | return &srq->ibsrq; | |
202 | ||
203 | err_wrid: | |
204 | if (pd->uobject) | |
205 | mlx4_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db); | |
206 | else | |
207 | kfree(srq->wrid); | |
208 | ||
209 | err_mtt: | |
210 | mlx4_mtt_cleanup(dev->dev, &srq->mtt); | |
211 | ||
212 | err_buf: | |
213 | if (pd->uobject) | |
214 | ib_umem_release(srq->umem); | |
215 | else | |
216 | mlx4_buf_free(dev->dev, buf_size, &srq->buf); | |
217 | ||
218 | err_db: | |
219 | if (!pd->uobject) | |
6296883c | 220 | mlx4_db_free(dev->dev, &srq->db); |
225c7b1f RD |
221 | |
222 | err_srq: | |
223 | kfree(srq); | |
224 | ||
225 | return ERR_PTR(err); | |
226 | } | |
227 | ||
228 | int mlx4_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr, | |
229 | enum ib_srq_attr_mask attr_mask, struct ib_udata *udata) | |
230 | { | |
231 | struct mlx4_ib_dev *dev = to_mdev(ibsrq->device); | |
232 | struct mlx4_ib_srq *srq = to_msrq(ibsrq); | |
233 | int ret; | |
234 | ||
235 | /* We don't support resizing SRQs (yet?) */ | |
236 | if (attr_mask & IB_SRQ_MAX_WR) | |
237 | return -EINVAL; | |
238 | ||
239 | if (attr_mask & IB_SRQ_LIMIT) { | |
240 | if (attr->srq_limit >= srq->msrq.max) | |
241 | return -EINVAL; | |
242 | ||
243 | mutex_lock(&srq->mutex); | |
244 | ret = mlx4_srq_arm(dev->dev, &srq->msrq, attr->srq_limit); | |
245 | mutex_unlock(&srq->mutex); | |
246 | ||
247 | if (ret) | |
248 | return ret; | |
249 | } | |
250 | ||
251 | return 0; | |
252 | } | |
253 | ||
65541cb7 JM |
254 | int mlx4_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr) |
255 | { | |
256 | struct mlx4_ib_dev *dev = to_mdev(ibsrq->device); | |
257 | struct mlx4_ib_srq *srq = to_msrq(ibsrq); | |
258 | int ret; | |
259 | int limit_watermark; | |
260 | ||
261 | ret = mlx4_srq_query(dev->dev, &srq->msrq, &limit_watermark); | |
262 | if (ret) | |
263 | return ret; | |
264 | ||
d7dc3ccb | 265 | srq_attr->srq_limit = limit_watermark; |
65541cb7 JM |
266 | srq_attr->max_wr = srq->msrq.max - 1; |
267 | srq_attr->max_sge = srq->msrq.max_gs; | |
268 | ||
269 | return 0; | |
270 | } | |
271 | ||
225c7b1f RD |
272 | int mlx4_ib_destroy_srq(struct ib_srq *srq) |
273 | { | |
274 | struct mlx4_ib_dev *dev = to_mdev(srq->device); | |
275 | struct mlx4_ib_srq *msrq = to_msrq(srq); | |
276 | ||
277 | mlx4_srq_free(dev->dev, &msrq->msrq); | |
278 | mlx4_mtt_cleanup(dev->dev, &msrq->mtt); | |
279 | ||
280 | if (srq->uobject) { | |
281 | mlx4_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db); | |
282 | ib_umem_release(msrq->umem); | |
283 | } else { | |
284 | kfree(msrq->wrid); | |
285 | mlx4_buf_free(dev->dev, msrq->msrq.max << msrq->msrq.wqe_shift, | |
286 | &msrq->buf); | |
6296883c | 287 | mlx4_db_free(dev->dev, &msrq->db); |
225c7b1f RD |
288 | } |
289 | ||
290 | kfree(msrq); | |
291 | ||
292 | return 0; | |
293 | } | |
294 | ||
295 | void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index) | |
296 | { | |
297 | struct mlx4_wqe_srq_next_seg *next; | |
298 | ||
299 | /* always called with interrupts disabled. */ | |
300 | spin_lock(&srq->lock); | |
301 | ||
302 | next = get_wqe(srq, srq->tail); | |
303 | next->next_wqe_index = cpu_to_be16(wqe_index); | |
304 | srq->tail = wqe_index; | |
305 | ||
306 | spin_unlock(&srq->lock); | |
307 | } | |
308 | ||
309 | int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr, | |
310 | struct ib_recv_wr **bad_wr) | |
311 | { | |
312 | struct mlx4_ib_srq *srq = to_msrq(ibsrq); | |
313 | struct mlx4_wqe_srq_next_seg *next; | |
314 | struct mlx4_wqe_data_seg *scat; | |
315 | unsigned long flags; | |
316 | int err = 0; | |
317 | int nreq; | |
318 | int i; | |
319 | ||
320 | spin_lock_irqsave(&srq->lock, flags); | |
321 | ||
322 | for (nreq = 0; wr; ++nreq, wr = wr->next) { | |
323 | if (unlikely(wr->num_sge > srq->msrq.max_gs)) { | |
324 | err = -EINVAL; | |
325 | *bad_wr = wr; | |
326 | break; | |
327 | } | |
328 | ||
56a8c8b6 RD |
329 | if (unlikely(srq->head == srq->tail)) { |
330 | err = -ENOMEM; | |
331 | *bad_wr = wr; | |
332 | break; | |
333 | } | |
334 | ||
225c7b1f RD |
335 | srq->wrid[srq->head] = wr->wr_id; |
336 | ||
337 | next = get_wqe(srq, srq->head); | |
338 | srq->head = be16_to_cpu(next->next_wqe_index); | |
339 | scat = (struct mlx4_wqe_data_seg *) (next + 1); | |
340 | ||
341 | for (i = 0; i < wr->num_sge; ++i) { | |
342 | scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length); | |
343 | scat[i].lkey = cpu_to_be32(wr->sg_list[i].lkey); | |
344 | scat[i].addr = cpu_to_be64(wr->sg_list[i].addr); | |
345 | } | |
346 | ||
347 | if (i < srq->msrq.max_gs) { | |
348 | scat[i].byte_count = 0; | |
349 | scat[i].lkey = cpu_to_be32(MLX4_INVALID_LKEY); | |
350 | scat[i].addr = 0; | |
351 | } | |
352 | } | |
353 | ||
354 | if (likely(nreq)) { | |
355 | srq->wqe_ctr += nreq; | |
356 | ||
357 | /* | |
358 | * Make sure that descriptors are written before | |
359 | * doorbell record. | |
360 | */ | |
361 | wmb(); | |
362 | ||
363 | *srq->db.db = cpu_to_be32(srq->wqe_ctr); | |
364 | } | |
365 | ||
366 | spin_unlock_irqrestore(&srq->lock, flags); | |
367 | ||
368 | return err; | |
369 | } |