1 /*
2 * Copyright (c) 2004, 2005 Topspin Communications. All rights reserved.
3 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
4 * Copyright (c) 2005 Cisco Systems, Inc. All rights reserved.
5 * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
6 * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
7 * Copyright (c) 2005 Open Grid Computing, Inc. All rights reserved.
8 *
9 * This software is available to you under a choice of one of two
10 * licenses. You may choose to be licensed under the terms of the GNU
11 * General Public License (GPL) Version 2, available from the file
12 * COPYING in the main directory of this source tree, or the
13 * OpenIB.org BSD license below:
14 *
15 * Redistribution and use in source and binary forms, with or
16 * without modification, are permitted provided that the following
17 * conditions are met:
18 *
19 * - Redistributions of source code must retain the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer.
22 *
23 * - Redistributions in binary form must reproduce the above
24 * copyright notice, this list of conditions and the following
25 * disclaimer in the documentation and/or other materials
26 * provided with the distribution.
27 *
28 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
29 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
30 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
31 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
32 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
33 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
34 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
35 * SOFTWARE.
36 *
37 */
38 #include "c2.h"
39 #include "c2_vq.h"
40 #include "c2_status.h"
41
42 #define C2_CQ_MSG_SIZE ((sizeof(struct c2wr_ce) + 32-1) & ~(32-1))
43
44 static struct c2_cq *c2_cq_get(struct c2_dev *c2dev, int cqn)
45 {
46 struct c2_cq *cq;
47 unsigned long flags;
48
49 spin_lock_irqsave(&c2dev->lock, flags);
50 cq = c2dev->qptr_array[cqn];
51 if (!cq) {
52 spin_unlock_irqrestore(&c2dev->lock, flags);
53 return NULL;
54 }
55 atomic_inc(&cq->refcount);
56 spin_unlock_irqrestore(&c2dev->lock, flags);
57 return cq;
58 }
59
60 static void c2_cq_put(struct c2_cq *cq)
61 {
62 if (atomic_dec_and_test(&cq->refcount))
63 wake_up(&cq->wait);
64 }
65
66 void c2_cq_event(struct c2_dev *c2dev, u32 mq_index)
67 {
68 struct c2_cq *cq;
69
70 cq = c2_cq_get(c2dev, mq_index);
71 if (!cq) {
72 printk("discarding events on destroyed CQN=%d\n", mq_index);
73 return;
74 }
75
76 (*cq->ibcq.comp_handler) (&cq->ibcq, cq->ibcq.cq_context);
77 c2_cq_put(cq);
78 }
79
80 void c2_cq_clean(struct c2_dev *c2dev, struct c2_qp *qp, u32 mq_index)
81 {
82 struct c2_cq *cq;
83 struct c2_mq *q;
84
85 cq = c2_cq_get(c2dev, mq_index);
86 if (!cq)
87 return;
88
89 spin_lock_irq(&cq->lock);
90 q = &cq->mq;
91 if (q && !c2_mq_empty(q)) {
92 u16 priv = q->priv;
93 struct c2wr_ce *msg;
94
95 while (priv != be16_to_cpu(*q->shared)) {
96 msg = (struct c2wr_ce *)
97 (q->msg_pool.host + priv * q->msg_size);
98 if (msg->qp_user_context == (u64) (unsigned long) qp) {
99 msg->qp_user_context = (u64) 0;
100 }
101 priv = (priv + 1) % q->q_size;
102 }
103 }
104 spin_unlock_irq(&cq->lock);
105 c2_cq_put(cq);
106 }
107
108 static inline enum ib_wc_status c2_cqe_status_to_openib(u8 status)
109 {
110 switch (status) {
111 case C2_OK:
112 return IB_WC_SUCCESS;
113 case CCERR_FLUSHED:
114 return IB_WC_WR_FLUSH_ERR;
115 case CCERR_BASE_AND_BOUNDS_VIOLATION:
116 return IB_WC_LOC_PROT_ERR;
117 case CCERR_ACCESS_VIOLATION:
118 return IB_WC_LOC_ACCESS_ERR;
119 case CCERR_TOTAL_LENGTH_TOO_BIG:
120 return IB_WC_LOC_LEN_ERR;
121 case CCERR_INVALID_WINDOW:
122 return IB_WC_MW_BIND_ERR;
123 default:
124 return IB_WC_GENERAL_ERR;
125 }
126 }
127
128
129 static inline int c2_poll_one(struct c2_dev *c2dev,
130 struct c2_cq *cq, struct ib_wc *entry)
131 {
132 struct c2wr_ce *ce;
133 struct c2_qp *qp;
134 int is_recv = 0;
135
136 ce = c2_mq_consume(&cq->mq);
137 if (!ce) {
138 return -EAGAIN;
139 }
140
141 /*
142 * if the qp returned is null then this qp has already
143 * been freed and we are unable process the completion.
144 * try pulling the next message
145 */
146 while ((qp =
147 (struct c2_qp *) (unsigned long) ce->qp_user_context) == NULL) {
148 c2_mq_free(&cq->mq);
149 ce = c2_mq_consume(&cq->mq);
150 if (!ce)
151 return -EAGAIN;
152 }
153
154 entry->status = c2_cqe_status_to_openib(c2_wr_get_result(ce));
155 entry->wr_id = ce->hdr.context;
156 entry->qp = &qp->ibqp;
157 entry->wc_flags = 0;
158 entry->slid = 0;
159 entry->sl = 0;
160 entry->src_qp = 0;
161 entry->dlid_path_bits = 0;
162 entry->pkey_index = 0;
163
164 switch (c2_wr_get_id(ce)) {
165 case C2_WR_TYPE_SEND:
166 entry->opcode = IB_WC_SEND;
167 break;
168 case C2_WR_TYPE_RDMA_WRITE:
169 entry->opcode = IB_WC_RDMA_WRITE;
170 break;
171 case C2_WR_TYPE_RDMA_READ:
172 entry->opcode = IB_WC_RDMA_READ;
173 break;
174 case C2_WR_TYPE_BIND_MW:
175 entry->opcode = IB_WC_BIND_MW;
176 break;
177 case C2_WR_TYPE_RECV:
178 entry->byte_len = be32_to_cpu(ce->bytes_rcvd);
179 entry->opcode = IB_WC_RECV;
180 is_recv = 1;
181 break;
182 default:
183 break;
184 }
185
186 /* consume the WQEs */
187 if (is_recv)
188 c2_mq_lconsume(&qp->rq_mq, 1);
189 else
190 c2_mq_lconsume(&qp->sq_mq,
191 be32_to_cpu(c2_wr_get_wqe_count(ce)) + 1);
192
193 /* free the message */
194 c2_mq_free(&cq->mq);
195
196 return 0;
197 }
198
199 int c2_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *entry)
200 {
201 struct c2_dev *c2dev = to_c2dev(ibcq->device);
202 struct c2_cq *cq = to_c2cq(ibcq);
203 unsigned long flags;
204 int npolled, err;
205
206 spin_lock_irqsave(&cq->lock, flags);
207
208 for (npolled = 0; npolled < num_entries; ++npolled) {
209
210 err = c2_poll_one(c2dev, cq, entry + npolled);
211 if (err)
212 break;
213 }
214
215 spin_unlock_irqrestore(&cq->lock, flags);
216
217 return npolled;
218 }
219
220 int c2_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags notify_flags)
221 {
222 struct c2_mq_shared __iomem *shared;
223 struct c2_cq *cq;
224 unsigned long flags;
225 int ret = 0;
226
227 cq = to_c2cq(ibcq);
228 shared = cq->mq.peer;
229
230 if ((notify_flags & IB_CQ_SOLICITED_MASK) == IB_CQ_NEXT_COMP)
231 writeb(C2_CQ_NOTIFICATION_TYPE_NEXT, &shared->notification_type);
232 else if ((notify_flags & IB_CQ_SOLICITED_MASK) == IB_CQ_SOLICITED)
233 writeb(C2_CQ_NOTIFICATION_TYPE_NEXT_SE, &shared->notification_type);
234 else
235 return -EINVAL;
236
237 writeb(CQ_WAIT_FOR_DMA | CQ_ARMED, &shared->armed);
238
239 /*
240 * Now read back shared->armed to make the PCI
241 * write synchronous. This is necessary for
242 * correct cq notification semantics.
243 */
244 readb(&shared->armed);
245
246 if (notify_flags & IB_CQ_REPORT_MISSED_EVENTS) {
247 spin_lock_irqsave(&cq->lock, flags);
248 ret = !c2_mq_empty(&cq->mq);
249 spin_unlock_irqrestore(&cq->lock, flags);
250 }
251
252 return ret;
253 }
254
255 static void c2_free_cq_buf(struct c2_dev *c2dev, struct c2_mq *mq)
256 {
257 dma_free_coherent(&c2dev->pcidev->dev, mq->q_size * mq->msg_size,
258 mq->msg_pool.host, pci_unmap_addr(mq, mapping));
259 }
260
261 static int c2_alloc_cq_buf(struct c2_dev *c2dev, struct c2_mq *mq, int q_size,
262 int msg_size)
263 {
264 u8 *pool_start;
265
266 pool_start = dma_alloc_coherent(&c2dev->pcidev->dev, q_size * msg_size,
267 &mq->host_dma, GFP_KERNEL);
268 if (!pool_start)
269 return -ENOMEM;
270
271 c2_mq_rep_init(mq,
272 0, /* index (currently unknown) */
273 q_size,
274 msg_size,
275 pool_start,
276 NULL, /* peer (currently unknown) */
277 C2_MQ_HOST_TARGET);
278
279 pci_unmap_addr_set(mq, mapping, mq->host_dma);
280
281 return 0;
282 }
283
284 int c2_init_cq(struct c2_dev *c2dev, int entries,
285 struct c2_ucontext *ctx, struct c2_cq *cq)
286 {
287 struct c2wr_cq_create_req wr;
288 struct c2wr_cq_create_rep *reply;
289 unsigned long peer_pa;
290 struct c2_vq_req *vq_req;
291 int err;
292
293 might_sleep();
294
295 cq->ibcq.cqe = entries - 1;
296 cq->is_kernel = !ctx;
297
298 /* Allocate a shared pointer */
299 cq->mq.shared = c2_alloc_mqsp(c2dev, c2dev->kern_mqsp_pool,
300 &cq->mq.shared_dma, GFP_KERNEL);
301 if (!cq->mq.shared)
302 return -ENOMEM;
303
304 /* Allocate pages for the message pool */
305 err = c2_alloc_cq_buf(c2dev, &cq->mq, entries + 1, C2_CQ_MSG_SIZE);
306 if (err)
307 goto bail0;
308
309 vq_req = vq_req_alloc(c2dev);
310 if (!vq_req) {
311 err = -ENOMEM;
312 goto bail1;
313 }
314
315 memset(&wr, 0, sizeof(wr));
316 c2_wr_set_id(&wr, CCWR_CQ_CREATE);
317 wr.hdr.context = (unsigned long) vq_req;
318 wr.rnic_handle = c2dev->adapter_handle;
319 wr.msg_size = cpu_to_be32(cq->mq.msg_size);
320 wr.depth = cpu_to_be32(cq->mq.q_size);
321 wr.shared_ht = cpu_to_be64(cq->mq.shared_dma);
322 wr.msg_pool = cpu_to_be64(cq->mq.host_dma);
323 wr.user_context = (u64) (unsigned long) (cq);
324
325 vq_req_get(c2dev, vq_req);
326
327 err = vq_send_wr(c2dev, (union c2wr *) & wr);
328 if (err) {
329 vq_req_put(c2dev, vq_req);
330 goto bail2;
331 }
332
333 err = vq_wait_for_reply(c2dev, vq_req);
334 if (err)
335 goto bail2;
336
337 reply = (struct c2wr_cq_create_rep *) (unsigned long) (vq_req->reply_msg);
338 if (!reply) {
339 err = -ENOMEM;
340 goto bail2;
341 }
342
343 if ((err = c2_errno(reply)) != 0)
344 goto bail3;
345
346 cq->adapter_handle = reply->cq_handle;
347 cq->mq.index = be32_to_cpu(reply->mq_index);
348
349 peer_pa = c2dev->pa + be32_to_cpu(reply->adapter_shared);
350 cq->mq.peer = ioremap_nocache(peer_pa, PAGE_SIZE);
351 if (!cq->mq.peer) {
352 err = -ENOMEM;
353 goto bail3;
354 }
355
356 vq_repbuf_free(c2dev, reply);
357 vq_req_free(c2dev, vq_req);
358
359 spin_lock_init(&cq->lock);
360 atomic_set(&cq->refcount, 1);
361 init_waitqueue_head(&cq->wait);
362
363 /*
364 * Use the MQ index allocated by the adapter to
365 * store the CQ in the qptr_array
366 */
367 cq->cqn = cq->mq.index;
368 c2dev->qptr_array[cq->cqn] = cq;
369
370 return 0;
371
372 bail3:
373 vq_repbuf_free(c2dev, reply);
374 bail2:
375 vq_req_free(c2dev, vq_req);
376 bail1:
377 c2_free_cq_buf(c2dev, &cq->mq);
378 bail0:
379 c2_free_mqsp(cq->mq.shared);
380
381 return err;
382 }
383
384 void c2_free_cq(struct c2_dev *c2dev, struct c2_cq *cq)
385 {
386 int err;
387 struct c2_vq_req *vq_req;
388 struct c2wr_cq_destroy_req wr;
389 struct c2wr_cq_destroy_rep *reply;
390
391 might_sleep();
392
393 /* Clear CQ from the qptr array */
394 spin_lock_irq(&c2dev->lock);
395 c2dev->qptr_array[cq->mq.index] = NULL;
396 atomic_dec(&cq->refcount);
397 spin_unlock_irq(&c2dev->lock);
398
399 wait_event(cq->wait, !atomic_read(&cq->refcount));
400
401 vq_req = vq_req_alloc(c2dev);
402 if (!vq_req) {
403 goto bail0;
404 }
405
406 memset(&wr, 0, sizeof(wr));
407 c2_wr_set_id(&wr, CCWR_CQ_DESTROY);
408 wr.hdr.context = (unsigned long) vq_req;
409 wr.rnic_handle = c2dev->adapter_handle;
410 wr.cq_handle = cq->adapter_handle;
411
412 vq_req_get(c2dev, vq_req);
413
414 err = vq_send_wr(c2dev, (union c2wr *) & wr);
415 if (err) {
416 vq_req_put(c2dev, vq_req);
417 goto bail1;
418 }
419
420 err = vq_wait_for_reply(c2dev, vq_req);
421 if (err)
422 goto bail1;
423
424 reply = (struct c2wr_cq_destroy_rep *) (unsigned long) (vq_req->reply_msg);
425 if (reply)
426 vq_repbuf_free(c2dev, reply);
427 bail1:
428 vq_req_free(c2dev, vq_req);
429 bail0:
430 if (cq->is_kernel) {
431 c2_free_cq_buf(c2dev, &cq->mq);
432 }
433
434 return;
435 }
436
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