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RDMA/cxgb4: Add support for iWARP Port Mapper user space service
[deliverable/linux.git] / drivers / infiniband / hw / cxgb4 / device.c
1 /*
2 * Copyright (c) 2009-2010 Chelsio, Inc. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 */
32 #include <linux/module.h>
33 #include <linux/moduleparam.h>
34 #include <linux/debugfs.h>
35 #include <linux/vmalloc.h>
36
37 #include <rdma/ib_verbs.h>
38
39 #include "iw_cxgb4.h"
40
41 #define DRV_VERSION "0.1"
42
43 MODULE_AUTHOR("Steve Wise");
44 MODULE_DESCRIPTION("Chelsio T4/T5 RDMA Driver");
45 MODULE_LICENSE("Dual BSD/GPL");
46 MODULE_VERSION(DRV_VERSION);
47
48 static int allow_db_fc_on_t5;
49 module_param(allow_db_fc_on_t5, int, 0644);
50 MODULE_PARM_DESC(allow_db_fc_on_t5,
51 "Allow DB Flow Control on T5 (default = 0)");
52
53 static int allow_db_coalescing_on_t5;
54 module_param(allow_db_coalescing_on_t5, int, 0644);
55 MODULE_PARM_DESC(allow_db_coalescing_on_t5,
56 "Allow DB Coalescing on T5 (default = 0)");
57
58 struct uld_ctx {
59 struct list_head entry;
60 struct cxgb4_lld_info lldi;
61 struct c4iw_dev *dev;
62 };
63
64 static LIST_HEAD(uld_ctx_list);
65 static DEFINE_MUTEX(dev_mutex);
66
67 #define DB_FC_RESUME_SIZE 64
68 #define DB_FC_RESUME_DELAY 1
69 #define DB_FC_DRAIN_THRESH 0
70
71 static struct dentry *c4iw_debugfs_root;
72
73 struct c4iw_debugfs_data {
74 struct c4iw_dev *devp;
75 char *buf;
76 int bufsize;
77 int pos;
78 };
79
80 /* registered cxgb4 netlink callbacks */
81 static struct ibnl_client_cbs c4iw_nl_cb_table[] = {
82 [RDMA_NL_IWPM_REG_PID] = {.dump = iwpm_register_pid_cb},
83 [RDMA_NL_IWPM_ADD_MAPPING] = {.dump = iwpm_add_mapping_cb},
84 [RDMA_NL_IWPM_QUERY_MAPPING] = {.dump = iwpm_add_and_query_mapping_cb},
85 [RDMA_NL_IWPM_HANDLE_ERR] = {.dump = iwpm_mapping_error_cb},
86 [RDMA_NL_IWPM_MAPINFO] = {.dump = iwpm_mapping_info_cb},
87 [RDMA_NL_IWPM_MAPINFO_NUM] = {.dump = iwpm_ack_mapping_info_cb}
88 };
89
90 static int count_idrs(int id, void *p, void *data)
91 {
92 int *countp = data;
93
94 *countp = *countp + 1;
95 return 0;
96 }
97
98 static ssize_t debugfs_read(struct file *file, char __user *buf, size_t count,
99 loff_t *ppos)
100 {
101 struct c4iw_debugfs_data *d = file->private_data;
102
103 return simple_read_from_buffer(buf, count, ppos, d->buf, d->pos);
104 }
105
106 static int dump_qp(int id, void *p, void *data)
107 {
108 struct c4iw_qp *qp = p;
109 struct c4iw_debugfs_data *qpd = data;
110 int space;
111 int cc;
112
113 if (id != qp->wq.sq.qid)
114 return 0;
115
116 space = qpd->bufsize - qpd->pos - 1;
117 if (space == 0)
118 return 1;
119
120 if (qp->ep) {
121 if (qp->ep->com.local_addr.ss_family == AF_INET) {
122 struct sockaddr_in *lsin = (struct sockaddr_in *)
123 &qp->ep->com.local_addr;
124 struct sockaddr_in *rsin = (struct sockaddr_in *)
125 &qp->ep->com.remote_addr;
126 struct sockaddr_in *mapped_lsin = (struct sockaddr_in *)
127 &qp->ep->com.mapped_local_addr;
128 struct sockaddr_in *mapped_rsin = (struct sockaddr_in *)
129 &qp->ep->com.mapped_remote_addr;
130
131 cc = snprintf(qpd->buf + qpd->pos, space,
132 "rc qp sq id %u rq id %u state %u "
133 "onchip %u ep tid %u state %u "
134 "%pI4:%u/%u->%pI4:%u/%u\n",
135 qp->wq.sq.qid, qp->wq.rq.qid,
136 (int)qp->attr.state,
137 qp->wq.sq.flags & T4_SQ_ONCHIP,
138 qp->ep->hwtid, (int)qp->ep->com.state,
139 &lsin->sin_addr, ntohs(lsin->sin_port),
140 ntohs(mapped_lsin->sin_port),
141 &rsin->sin_addr, ntohs(rsin->sin_port),
142 ntohs(mapped_rsin->sin_port));
143 } else {
144 struct sockaddr_in6 *lsin6 = (struct sockaddr_in6 *)
145 &qp->ep->com.local_addr;
146 struct sockaddr_in6 *rsin6 = (struct sockaddr_in6 *)
147 &qp->ep->com.remote_addr;
148 struct sockaddr_in6 *mapped_lsin6 =
149 (struct sockaddr_in6 *)
150 &qp->ep->com.mapped_local_addr;
151 struct sockaddr_in6 *mapped_rsin6 =
152 (struct sockaddr_in6 *)
153 &qp->ep->com.mapped_remote_addr;
154
155 cc = snprintf(qpd->buf + qpd->pos, space,
156 "rc qp sq id %u rq id %u state %u "
157 "onchip %u ep tid %u state %u "
158 "%pI6:%u/%u->%pI6:%u/%u\n",
159 qp->wq.sq.qid, qp->wq.rq.qid,
160 (int)qp->attr.state,
161 qp->wq.sq.flags & T4_SQ_ONCHIP,
162 qp->ep->hwtid, (int)qp->ep->com.state,
163 &lsin6->sin6_addr,
164 ntohs(lsin6->sin6_port),
165 ntohs(mapped_lsin6->sin6_port),
166 &rsin6->sin6_addr,
167 ntohs(rsin6->sin6_port),
168 ntohs(mapped_rsin6->sin6_port));
169 }
170 } else
171 cc = snprintf(qpd->buf + qpd->pos, space,
172 "qp sq id %u rq id %u state %u onchip %u\n",
173 qp->wq.sq.qid, qp->wq.rq.qid,
174 (int)qp->attr.state,
175 qp->wq.sq.flags & T4_SQ_ONCHIP);
176 if (cc < space)
177 qpd->pos += cc;
178 return 0;
179 }
180
181 static int qp_release(struct inode *inode, struct file *file)
182 {
183 struct c4iw_debugfs_data *qpd = file->private_data;
184 if (!qpd) {
185 printk(KERN_INFO "%s null qpd?\n", __func__);
186 return 0;
187 }
188 vfree(qpd->buf);
189 kfree(qpd);
190 return 0;
191 }
192
193 static int qp_open(struct inode *inode, struct file *file)
194 {
195 struct c4iw_debugfs_data *qpd;
196 int ret = 0;
197 int count = 1;
198
199 qpd = kmalloc(sizeof *qpd, GFP_KERNEL);
200 if (!qpd) {
201 ret = -ENOMEM;
202 goto out;
203 }
204 qpd->devp = inode->i_private;
205 qpd->pos = 0;
206
207 spin_lock_irq(&qpd->devp->lock);
208 idr_for_each(&qpd->devp->qpidr, count_idrs, &count);
209 spin_unlock_irq(&qpd->devp->lock);
210
211 qpd->bufsize = count * 128;
212 qpd->buf = vmalloc(qpd->bufsize);
213 if (!qpd->buf) {
214 ret = -ENOMEM;
215 goto err1;
216 }
217
218 spin_lock_irq(&qpd->devp->lock);
219 idr_for_each(&qpd->devp->qpidr, dump_qp, qpd);
220 spin_unlock_irq(&qpd->devp->lock);
221
222 qpd->buf[qpd->pos++] = 0;
223 file->private_data = qpd;
224 goto out;
225 err1:
226 kfree(qpd);
227 out:
228 return ret;
229 }
230
231 static const struct file_operations qp_debugfs_fops = {
232 .owner = THIS_MODULE,
233 .open = qp_open,
234 .release = qp_release,
235 .read = debugfs_read,
236 .llseek = default_llseek,
237 };
238
239 static int dump_stag(int id, void *p, void *data)
240 {
241 struct c4iw_debugfs_data *stagd = data;
242 int space;
243 int cc;
244
245 space = stagd->bufsize - stagd->pos - 1;
246 if (space == 0)
247 return 1;
248
249 cc = snprintf(stagd->buf + stagd->pos, space, "0x%x\n", id<<8);
250 if (cc < space)
251 stagd->pos += cc;
252 return 0;
253 }
254
255 static int stag_release(struct inode *inode, struct file *file)
256 {
257 struct c4iw_debugfs_data *stagd = file->private_data;
258 if (!stagd) {
259 printk(KERN_INFO "%s null stagd?\n", __func__);
260 return 0;
261 }
262 kfree(stagd->buf);
263 kfree(stagd);
264 return 0;
265 }
266
267 static int stag_open(struct inode *inode, struct file *file)
268 {
269 struct c4iw_debugfs_data *stagd;
270 int ret = 0;
271 int count = 1;
272
273 stagd = kmalloc(sizeof *stagd, GFP_KERNEL);
274 if (!stagd) {
275 ret = -ENOMEM;
276 goto out;
277 }
278 stagd->devp = inode->i_private;
279 stagd->pos = 0;
280
281 spin_lock_irq(&stagd->devp->lock);
282 idr_for_each(&stagd->devp->mmidr, count_idrs, &count);
283 spin_unlock_irq(&stagd->devp->lock);
284
285 stagd->bufsize = count * sizeof("0x12345678\n");
286 stagd->buf = kmalloc(stagd->bufsize, GFP_KERNEL);
287 if (!stagd->buf) {
288 ret = -ENOMEM;
289 goto err1;
290 }
291
292 spin_lock_irq(&stagd->devp->lock);
293 idr_for_each(&stagd->devp->mmidr, dump_stag, stagd);
294 spin_unlock_irq(&stagd->devp->lock);
295
296 stagd->buf[stagd->pos++] = 0;
297 file->private_data = stagd;
298 goto out;
299 err1:
300 kfree(stagd);
301 out:
302 return ret;
303 }
304
305 static const struct file_operations stag_debugfs_fops = {
306 .owner = THIS_MODULE,
307 .open = stag_open,
308 .release = stag_release,
309 .read = debugfs_read,
310 .llseek = default_llseek,
311 };
312
313 static char *db_state_str[] = {"NORMAL", "FLOW_CONTROL", "RECOVERY", "STOPPED"};
314
315 static int stats_show(struct seq_file *seq, void *v)
316 {
317 struct c4iw_dev *dev = seq->private;
318
319 seq_printf(seq, " Object: %10s %10s %10s %10s\n", "Total", "Current",
320 "Max", "Fail");
321 seq_printf(seq, " PDID: %10llu %10llu %10llu %10llu\n",
322 dev->rdev.stats.pd.total, dev->rdev.stats.pd.cur,
323 dev->rdev.stats.pd.max, dev->rdev.stats.pd.fail);
324 seq_printf(seq, " QID: %10llu %10llu %10llu %10llu\n",
325 dev->rdev.stats.qid.total, dev->rdev.stats.qid.cur,
326 dev->rdev.stats.qid.max, dev->rdev.stats.qid.fail);
327 seq_printf(seq, " TPTMEM: %10llu %10llu %10llu %10llu\n",
328 dev->rdev.stats.stag.total, dev->rdev.stats.stag.cur,
329 dev->rdev.stats.stag.max, dev->rdev.stats.stag.fail);
330 seq_printf(seq, " PBLMEM: %10llu %10llu %10llu %10llu\n",
331 dev->rdev.stats.pbl.total, dev->rdev.stats.pbl.cur,
332 dev->rdev.stats.pbl.max, dev->rdev.stats.pbl.fail);
333 seq_printf(seq, " RQTMEM: %10llu %10llu %10llu %10llu\n",
334 dev->rdev.stats.rqt.total, dev->rdev.stats.rqt.cur,
335 dev->rdev.stats.rqt.max, dev->rdev.stats.rqt.fail);
336 seq_printf(seq, " OCQPMEM: %10llu %10llu %10llu %10llu\n",
337 dev->rdev.stats.ocqp.total, dev->rdev.stats.ocqp.cur,
338 dev->rdev.stats.ocqp.max, dev->rdev.stats.ocqp.fail);
339 seq_printf(seq, " DB FULL: %10llu\n", dev->rdev.stats.db_full);
340 seq_printf(seq, " DB EMPTY: %10llu\n", dev->rdev.stats.db_empty);
341 seq_printf(seq, " DB DROP: %10llu\n", dev->rdev.stats.db_drop);
342 seq_printf(seq, " DB State: %s Transitions %llu FC Interruptions %llu\n",
343 db_state_str[dev->db_state],
344 dev->rdev.stats.db_state_transitions,
345 dev->rdev.stats.db_fc_interruptions);
346 seq_printf(seq, "TCAM_FULL: %10llu\n", dev->rdev.stats.tcam_full);
347 seq_printf(seq, "ACT_OFLD_CONN_FAILS: %10llu\n",
348 dev->rdev.stats.act_ofld_conn_fails);
349 seq_printf(seq, "PAS_OFLD_CONN_FAILS: %10llu\n",
350 dev->rdev.stats.pas_ofld_conn_fails);
351 return 0;
352 }
353
354 static int stats_open(struct inode *inode, struct file *file)
355 {
356 return single_open(file, stats_show, inode->i_private);
357 }
358
359 static ssize_t stats_clear(struct file *file, const char __user *buf,
360 size_t count, loff_t *pos)
361 {
362 struct c4iw_dev *dev = ((struct seq_file *)file->private_data)->private;
363
364 mutex_lock(&dev->rdev.stats.lock);
365 dev->rdev.stats.pd.max = 0;
366 dev->rdev.stats.pd.fail = 0;
367 dev->rdev.stats.qid.max = 0;
368 dev->rdev.stats.qid.fail = 0;
369 dev->rdev.stats.stag.max = 0;
370 dev->rdev.stats.stag.fail = 0;
371 dev->rdev.stats.pbl.max = 0;
372 dev->rdev.stats.pbl.fail = 0;
373 dev->rdev.stats.rqt.max = 0;
374 dev->rdev.stats.rqt.fail = 0;
375 dev->rdev.stats.ocqp.max = 0;
376 dev->rdev.stats.ocqp.fail = 0;
377 dev->rdev.stats.db_full = 0;
378 dev->rdev.stats.db_empty = 0;
379 dev->rdev.stats.db_drop = 0;
380 dev->rdev.stats.db_state_transitions = 0;
381 dev->rdev.stats.tcam_full = 0;
382 dev->rdev.stats.act_ofld_conn_fails = 0;
383 dev->rdev.stats.pas_ofld_conn_fails = 0;
384 mutex_unlock(&dev->rdev.stats.lock);
385 return count;
386 }
387
388 static const struct file_operations stats_debugfs_fops = {
389 .owner = THIS_MODULE,
390 .open = stats_open,
391 .release = single_release,
392 .read = seq_read,
393 .llseek = seq_lseek,
394 .write = stats_clear,
395 };
396
397 static int dump_ep(int id, void *p, void *data)
398 {
399 struct c4iw_ep *ep = p;
400 struct c4iw_debugfs_data *epd = data;
401 int space;
402 int cc;
403
404 space = epd->bufsize - epd->pos - 1;
405 if (space == 0)
406 return 1;
407
408 if (ep->com.local_addr.ss_family == AF_INET) {
409 struct sockaddr_in *lsin = (struct sockaddr_in *)
410 &ep->com.local_addr;
411 struct sockaddr_in *rsin = (struct sockaddr_in *)
412 &ep->com.remote_addr;
413 struct sockaddr_in *mapped_lsin = (struct sockaddr_in *)
414 &ep->com.mapped_local_addr;
415 struct sockaddr_in *mapped_rsin = (struct sockaddr_in *)
416 &ep->com.mapped_remote_addr;
417
418 cc = snprintf(epd->buf + epd->pos, space,
419 "ep %p cm_id %p qp %p state %d flags 0x%lx "
420 "history 0x%lx hwtid %d atid %d "
421 "%pI4:%d/%d <-> %pI4:%d/%d\n",
422 ep, ep->com.cm_id, ep->com.qp,
423 (int)ep->com.state, ep->com.flags,
424 ep->com.history, ep->hwtid, ep->atid,
425 &lsin->sin_addr, ntohs(lsin->sin_port),
426 ntohs(mapped_lsin->sin_port),
427 &rsin->sin_addr, ntohs(rsin->sin_port),
428 ntohs(mapped_rsin->sin_port));
429 } else {
430 struct sockaddr_in6 *lsin6 = (struct sockaddr_in6 *)
431 &ep->com.local_addr;
432 struct sockaddr_in6 *rsin6 = (struct sockaddr_in6 *)
433 &ep->com.remote_addr;
434 struct sockaddr_in6 *mapped_lsin6 = (struct sockaddr_in6 *)
435 &ep->com.mapped_local_addr;
436 struct sockaddr_in6 *mapped_rsin6 = (struct sockaddr_in6 *)
437 &ep->com.mapped_remote_addr;
438
439 cc = snprintf(epd->buf + epd->pos, space,
440 "ep %p cm_id %p qp %p state %d flags 0x%lx "
441 "history 0x%lx hwtid %d atid %d "
442 "%pI6:%d/%d <-> %pI6:%d/%d\n",
443 ep, ep->com.cm_id, ep->com.qp,
444 (int)ep->com.state, ep->com.flags,
445 ep->com.history, ep->hwtid, ep->atid,
446 &lsin6->sin6_addr, ntohs(lsin6->sin6_port),
447 ntohs(mapped_lsin6->sin6_port),
448 &rsin6->sin6_addr, ntohs(rsin6->sin6_port),
449 ntohs(mapped_rsin6->sin6_port));
450 }
451 if (cc < space)
452 epd->pos += cc;
453 return 0;
454 }
455
456 static int dump_listen_ep(int id, void *p, void *data)
457 {
458 struct c4iw_listen_ep *ep = p;
459 struct c4iw_debugfs_data *epd = data;
460 int space;
461 int cc;
462
463 space = epd->bufsize - epd->pos - 1;
464 if (space == 0)
465 return 1;
466
467 if (ep->com.local_addr.ss_family == AF_INET) {
468 struct sockaddr_in *lsin = (struct sockaddr_in *)
469 &ep->com.local_addr;
470 struct sockaddr_in *mapped_lsin = (struct sockaddr_in *)
471 &ep->com.mapped_local_addr;
472
473 cc = snprintf(epd->buf + epd->pos, space,
474 "ep %p cm_id %p state %d flags 0x%lx stid %d "
475 "backlog %d %pI4:%d/%d\n",
476 ep, ep->com.cm_id, (int)ep->com.state,
477 ep->com.flags, ep->stid, ep->backlog,
478 &lsin->sin_addr, ntohs(lsin->sin_port),
479 ntohs(mapped_lsin->sin_port));
480 } else {
481 struct sockaddr_in6 *lsin6 = (struct sockaddr_in6 *)
482 &ep->com.local_addr;
483 struct sockaddr_in6 *mapped_lsin6 = (struct sockaddr_in6 *)
484 &ep->com.mapped_local_addr;
485
486 cc = snprintf(epd->buf + epd->pos, space,
487 "ep %p cm_id %p state %d flags 0x%lx stid %d "
488 "backlog %d %pI6:%d/%d\n",
489 ep, ep->com.cm_id, (int)ep->com.state,
490 ep->com.flags, ep->stid, ep->backlog,
491 &lsin6->sin6_addr, ntohs(lsin6->sin6_port),
492 ntohs(mapped_lsin6->sin6_port));
493 }
494 if (cc < space)
495 epd->pos += cc;
496 return 0;
497 }
498
499 static int ep_release(struct inode *inode, struct file *file)
500 {
501 struct c4iw_debugfs_data *epd = file->private_data;
502 if (!epd) {
503 pr_info("%s null qpd?\n", __func__);
504 return 0;
505 }
506 vfree(epd->buf);
507 kfree(epd);
508 return 0;
509 }
510
511 static int ep_open(struct inode *inode, struct file *file)
512 {
513 struct c4iw_debugfs_data *epd;
514 int ret = 0;
515 int count = 1;
516
517 epd = kmalloc(sizeof(*epd), GFP_KERNEL);
518 if (!epd) {
519 ret = -ENOMEM;
520 goto out;
521 }
522 epd->devp = inode->i_private;
523 epd->pos = 0;
524
525 spin_lock_irq(&epd->devp->lock);
526 idr_for_each(&epd->devp->hwtid_idr, count_idrs, &count);
527 idr_for_each(&epd->devp->atid_idr, count_idrs, &count);
528 idr_for_each(&epd->devp->stid_idr, count_idrs, &count);
529 spin_unlock_irq(&epd->devp->lock);
530
531 epd->bufsize = count * 160;
532 epd->buf = vmalloc(epd->bufsize);
533 if (!epd->buf) {
534 ret = -ENOMEM;
535 goto err1;
536 }
537
538 spin_lock_irq(&epd->devp->lock);
539 idr_for_each(&epd->devp->hwtid_idr, dump_ep, epd);
540 idr_for_each(&epd->devp->atid_idr, dump_ep, epd);
541 idr_for_each(&epd->devp->stid_idr, dump_listen_ep, epd);
542 spin_unlock_irq(&epd->devp->lock);
543
544 file->private_data = epd;
545 goto out;
546 err1:
547 kfree(epd);
548 out:
549 return ret;
550 }
551
552 static const struct file_operations ep_debugfs_fops = {
553 .owner = THIS_MODULE,
554 .open = ep_open,
555 .release = ep_release,
556 .read = debugfs_read,
557 };
558
559 static int setup_debugfs(struct c4iw_dev *devp)
560 {
561 struct dentry *de;
562
563 if (!devp->debugfs_root)
564 return -1;
565
566 de = debugfs_create_file("qps", S_IWUSR, devp->debugfs_root,
567 (void *)devp, &qp_debugfs_fops);
568 if (de && de->d_inode)
569 de->d_inode->i_size = 4096;
570
571 de = debugfs_create_file("stags", S_IWUSR, devp->debugfs_root,
572 (void *)devp, &stag_debugfs_fops);
573 if (de && de->d_inode)
574 de->d_inode->i_size = 4096;
575
576 de = debugfs_create_file("stats", S_IWUSR, devp->debugfs_root,
577 (void *)devp, &stats_debugfs_fops);
578 if (de && de->d_inode)
579 de->d_inode->i_size = 4096;
580
581 de = debugfs_create_file("eps", S_IWUSR, devp->debugfs_root,
582 (void *)devp, &ep_debugfs_fops);
583 if (de && de->d_inode)
584 de->d_inode->i_size = 4096;
585
586 return 0;
587 }
588
589 void c4iw_release_dev_ucontext(struct c4iw_rdev *rdev,
590 struct c4iw_dev_ucontext *uctx)
591 {
592 struct list_head *pos, *nxt;
593 struct c4iw_qid_list *entry;
594
595 mutex_lock(&uctx->lock);
596 list_for_each_safe(pos, nxt, &uctx->qpids) {
597 entry = list_entry(pos, struct c4iw_qid_list, entry);
598 list_del_init(&entry->entry);
599 if (!(entry->qid & rdev->qpmask)) {
600 c4iw_put_resource(&rdev->resource.qid_table,
601 entry->qid);
602 mutex_lock(&rdev->stats.lock);
603 rdev->stats.qid.cur -= rdev->qpmask + 1;
604 mutex_unlock(&rdev->stats.lock);
605 }
606 kfree(entry);
607 }
608
609 list_for_each_safe(pos, nxt, &uctx->qpids) {
610 entry = list_entry(pos, struct c4iw_qid_list, entry);
611 list_del_init(&entry->entry);
612 kfree(entry);
613 }
614 mutex_unlock(&uctx->lock);
615 }
616
617 void c4iw_init_dev_ucontext(struct c4iw_rdev *rdev,
618 struct c4iw_dev_ucontext *uctx)
619 {
620 INIT_LIST_HEAD(&uctx->qpids);
621 INIT_LIST_HEAD(&uctx->cqids);
622 mutex_init(&uctx->lock);
623 }
624
625 /* Caller takes care of locking if needed */
626 static int c4iw_rdev_open(struct c4iw_rdev *rdev)
627 {
628 int err;
629
630 c4iw_init_dev_ucontext(rdev, &rdev->uctx);
631
632 /*
633 * qpshift is the number of bits to shift the qpid left in order
634 * to get the correct address of the doorbell for that qp.
635 */
636 rdev->qpshift = PAGE_SHIFT - ilog2(rdev->lldi.udb_density);
637 rdev->qpmask = rdev->lldi.udb_density - 1;
638 rdev->cqshift = PAGE_SHIFT - ilog2(rdev->lldi.ucq_density);
639 rdev->cqmask = rdev->lldi.ucq_density - 1;
640 PDBG("%s dev %s stag start 0x%0x size 0x%0x num stags %d "
641 "pbl start 0x%0x size 0x%0x rq start 0x%0x size 0x%0x "
642 "qp qid start %u size %u cq qid start %u size %u\n",
643 __func__, pci_name(rdev->lldi.pdev), rdev->lldi.vr->stag.start,
644 rdev->lldi.vr->stag.size, c4iw_num_stags(rdev),
645 rdev->lldi.vr->pbl.start,
646 rdev->lldi.vr->pbl.size, rdev->lldi.vr->rq.start,
647 rdev->lldi.vr->rq.size,
648 rdev->lldi.vr->qp.start,
649 rdev->lldi.vr->qp.size,
650 rdev->lldi.vr->cq.start,
651 rdev->lldi.vr->cq.size);
652 PDBG("udb len 0x%x udb base %llx db_reg %p gts_reg %p qpshift %lu "
653 "qpmask 0x%x cqshift %lu cqmask 0x%x\n",
654 (unsigned)pci_resource_len(rdev->lldi.pdev, 2),
655 (u64)pci_resource_start(rdev->lldi.pdev, 2),
656 rdev->lldi.db_reg,
657 rdev->lldi.gts_reg,
658 rdev->qpshift, rdev->qpmask,
659 rdev->cqshift, rdev->cqmask);
660
661 if (c4iw_num_stags(rdev) == 0) {
662 err = -EINVAL;
663 goto err1;
664 }
665
666 rdev->stats.pd.total = T4_MAX_NUM_PD;
667 rdev->stats.stag.total = rdev->lldi.vr->stag.size;
668 rdev->stats.pbl.total = rdev->lldi.vr->pbl.size;
669 rdev->stats.rqt.total = rdev->lldi.vr->rq.size;
670 rdev->stats.ocqp.total = rdev->lldi.vr->ocq.size;
671 rdev->stats.qid.total = rdev->lldi.vr->qp.size;
672
673 err = c4iw_init_resource(rdev, c4iw_num_stags(rdev), T4_MAX_NUM_PD);
674 if (err) {
675 printk(KERN_ERR MOD "error %d initializing resources\n", err);
676 goto err1;
677 }
678 err = c4iw_pblpool_create(rdev);
679 if (err) {
680 printk(KERN_ERR MOD "error %d initializing pbl pool\n", err);
681 goto err2;
682 }
683 err = c4iw_rqtpool_create(rdev);
684 if (err) {
685 printk(KERN_ERR MOD "error %d initializing rqt pool\n", err);
686 goto err3;
687 }
688 err = c4iw_ocqp_pool_create(rdev);
689 if (err) {
690 printk(KERN_ERR MOD "error %d initializing ocqp pool\n", err);
691 goto err4;
692 }
693 rdev->status_page = (struct t4_dev_status_page *)
694 __get_free_page(GFP_KERNEL);
695 if (!rdev->status_page) {
696 pr_err(MOD "error allocating status page\n");
697 goto err4;
698 }
699 return 0;
700 err4:
701 c4iw_rqtpool_destroy(rdev);
702 err3:
703 c4iw_pblpool_destroy(rdev);
704 err2:
705 c4iw_destroy_resource(&rdev->resource);
706 err1:
707 return err;
708 }
709
710 static void c4iw_rdev_close(struct c4iw_rdev *rdev)
711 {
712 free_page((unsigned long)rdev->status_page);
713 c4iw_pblpool_destroy(rdev);
714 c4iw_rqtpool_destroy(rdev);
715 c4iw_destroy_resource(&rdev->resource);
716 }
717
718 static void c4iw_dealloc(struct uld_ctx *ctx)
719 {
720 c4iw_rdev_close(&ctx->dev->rdev);
721 idr_destroy(&ctx->dev->cqidr);
722 idr_destroy(&ctx->dev->qpidr);
723 idr_destroy(&ctx->dev->mmidr);
724 idr_destroy(&ctx->dev->hwtid_idr);
725 idr_destroy(&ctx->dev->stid_idr);
726 idr_destroy(&ctx->dev->atid_idr);
727 if (ctx->dev->rdev.bar2_kva)
728 iounmap(ctx->dev->rdev.bar2_kva);
729 if (ctx->dev->rdev.oc_mw_kva)
730 iounmap(ctx->dev->rdev.oc_mw_kva);
731 ib_dealloc_device(&ctx->dev->ibdev);
732 iwpm_exit(RDMA_NL_C4IW);
733 ctx->dev = NULL;
734 }
735
736 static void c4iw_remove(struct uld_ctx *ctx)
737 {
738 PDBG("%s c4iw_dev %p\n", __func__, ctx->dev);
739 c4iw_unregister_device(ctx->dev);
740 c4iw_dealloc(ctx);
741 }
742
743 static int rdma_supported(const struct cxgb4_lld_info *infop)
744 {
745 return infop->vr->stag.size > 0 && infop->vr->pbl.size > 0 &&
746 infop->vr->rq.size > 0 && infop->vr->qp.size > 0 &&
747 infop->vr->cq.size > 0;
748 }
749
750 static struct c4iw_dev *c4iw_alloc(const struct cxgb4_lld_info *infop)
751 {
752 struct c4iw_dev *devp;
753 int ret;
754
755 if (!rdma_supported(infop)) {
756 printk(KERN_INFO MOD "%s: RDMA not supported on this device.\n",
757 pci_name(infop->pdev));
758 return ERR_PTR(-ENOSYS);
759 }
760 if (!ocqp_supported(infop))
761 pr_info("%s: On-Chip Queues not supported on this device.\n",
762 pci_name(infop->pdev));
763
764 devp = (struct c4iw_dev *)ib_alloc_device(sizeof(*devp));
765 if (!devp) {
766 printk(KERN_ERR MOD "Cannot allocate ib device\n");
767 return ERR_PTR(-ENOMEM);
768 }
769 devp->rdev.lldi = *infop;
770
771 /*
772 * For T5 devices, we map all of BAR2 with WC.
773 * For T4 devices with onchip qp mem, we map only that part
774 * of BAR2 with WC.
775 */
776 devp->rdev.bar2_pa = pci_resource_start(devp->rdev.lldi.pdev, 2);
777 if (is_t5(devp->rdev.lldi.adapter_type)) {
778 devp->rdev.bar2_kva = ioremap_wc(devp->rdev.bar2_pa,
779 pci_resource_len(devp->rdev.lldi.pdev, 2));
780 if (!devp->rdev.bar2_kva) {
781 pr_err(MOD "Unable to ioremap BAR2\n");
782 return ERR_PTR(-EINVAL);
783 }
784 } else if (ocqp_supported(infop)) {
785 devp->rdev.oc_mw_pa =
786 pci_resource_start(devp->rdev.lldi.pdev, 2) +
787 pci_resource_len(devp->rdev.lldi.pdev, 2) -
788 roundup_pow_of_two(devp->rdev.lldi.vr->ocq.size);
789 devp->rdev.oc_mw_kva = ioremap_wc(devp->rdev.oc_mw_pa,
790 devp->rdev.lldi.vr->ocq.size);
791 if (!devp->rdev.oc_mw_kva) {
792 pr_err(MOD "Unable to ioremap onchip mem\n");
793 return ERR_PTR(-EINVAL);
794 }
795 }
796
797 PDBG(KERN_INFO MOD "ocq memory: "
798 "hw_start 0x%x size %u mw_pa 0x%lx mw_kva %p\n",
799 devp->rdev.lldi.vr->ocq.start, devp->rdev.lldi.vr->ocq.size,
800 devp->rdev.oc_mw_pa, devp->rdev.oc_mw_kva);
801
802 ret = c4iw_rdev_open(&devp->rdev);
803 if (ret) {
804 printk(KERN_ERR MOD "Unable to open CXIO rdev err %d\n", ret);
805 ib_dealloc_device(&devp->ibdev);
806 return ERR_PTR(ret);
807 }
808
809 idr_init(&devp->cqidr);
810 idr_init(&devp->qpidr);
811 idr_init(&devp->mmidr);
812 idr_init(&devp->hwtid_idr);
813 idr_init(&devp->stid_idr);
814 idr_init(&devp->atid_idr);
815 spin_lock_init(&devp->lock);
816 mutex_init(&devp->rdev.stats.lock);
817 mutex_init(&devp->db_mutex);
818 INIT_LIST_HEAD(&devp->db_fc_list);
819
820 if (c4iw_debugfs_root) {
821 devp->debugfs_root = debugfs_create_dir(
822 pci_name(devp->rdev.lldi.pdev),
823 c4iw_debugfs_root);
824 setup_debugfs(devp);
825 }
826
827 ret = iwpm_init(RDMA_NL_C4IW);
828 if (ret) {
829 pr_err("port mapper initialization failed with %d\n", ret);
830 ib_dealloc_device(&devp->ibdev);
831 return ERR_PTR(ret);
832 }
833
834 return devp;
835 }
836
837 static void *c4iw_uld_add(const struct cxgb4_lld_info *infop)
838 {
839 struct uld_ctx *ctx;
840 static int vers_printed;
841 int i;
842
843 if (!vers_printed++)
844 pr_info("Chelsio T4/T5 RDMA Driver - version %s\n",
845 DRV_VERSION);
846
847 ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
848 if (!ctx) {
849 ctx = ERR_PTR(-ENOMEM);
850 goto out;
851 }
852 ctx->lldi = *infop;
853
854 PDBG("%s found device %s nchan %u nrxq %u ntxq %u nports %u\n",
855 __func__, pci_name(ctx->lldi.pdev),
856 ctx->lldi.nchan, ctx->lldi.nrxq,
857 ctx->lldi.ntxq, ctx->lldi.nports);
858
859 mutex_lock(&dev_mutex);
860 list_add_tail(&ctx->entry, &uld_ctx_list);
861 mutex_unlock(&dev_mutex);
862
863 for (i = 0; i < ctx->lldi.nrxq; i++)
864 PDBG("rxqid[%u] %u\n", i, ctx->lldi.rxq_ids[i]);
865 out:
866 return ctx;
867 }
868
869 static inline struct sk_buff *copy_gl_to_skb_pkt(const struct pkt_gl *gl,
870 const __be64 *rsp,
871 u32 pktshift)
872 {
873 struct sk_buff *skb;
874
875 /*
876 * Allocate space for cpl_pass_accept_req which will be synthesized by
877 * driver. Once the driver synthesizes the request the skb will go
878 * through the regular cpl_pass_accept_req processing.
879 * The math here assumes sizeof cpl_pass_accept_req >= sizeof
880 * cpl_rx_pkt.
881 */
882 skb = alloc_skb(gl->tot_len + sizeof(struct cpl_pass_accept_req) +
883 sizeof(struct rss_header) - pktshift, GFP_ATOMIC);
884 if (unlikely(!skb))
885 return NULL;
886
887 __skb_put(skb, gl->tot_len + sizeof(struct cpl_pass_accept_req) +
888 sizeof(struct rss_header) - pktshift);
889
890 /*
891 * This skb will contain:
892 * rss_header from the rspq descriptor (1 flit)
893 * cpl_rx_pkt struct from the rspq descriptor (2 flits)
894 * space for the difference between the size of an
895 * rx_pkt and pass_accept_req cpl (1 flit)
896 * the packet data from the gl
897 */
898 skb_copy_to_linear_data(skb, rsp, sizeof(struct cpl_pass_accept_req) +
899 sizeof(struct rss_header));
900 skb_copy_to_linear_data_offset(skb, sizeof(struct rss_header) +
901 sizeof(struct cpl_pass_accept_req),
902 gl->va + pktshift,
903 gl->tot_len - pktshift);
904 return skb;
905 }
906
907 static inline int recv_rx_pkt(struct c4iw_dev *dev, const struct pkt_gl *gl,
908 const __be64 *rsp)
909 {
910 unsigned int opcode = *(u8 *)rsp;
911 struct sk_buff *skb;
912
913 if (opcode != CPL_RX_PKT)
914 goto out;
915
916 skb = copy_gl_to_skb_pkt(gl , rsp, dev->rdev.lldi.sge_pktshift);
917 if (skb == NULL)
918 goto out;
919
920 if (c4iw_handlers[opcode] == NULL) {
921 pr_info("%s no handler opcode 0x%x...\n", __func__,
922 opcode);
923 kfree_skb(skb);
924 goto out;
925 }
926 c4iw_handlers[opcode](dev, skb);
927 return 1;
928 out:
929 return 0;
930 }
931
932 static int c4iw_uld_rx_handler(void *handle, const __be64 *rsp,
933 const struct pkt_gl *gl)
934 {
935 struct uld_ctx *ctx = handle;
936 struct c4iw_dev *dev = ctx->dev;
937 struct sk_buff *skb;
938 u8 opcode;
939
940 if (gl == NULL) {
941 /* omit RSS and rsp_ctrl at end of descriptor */
942 unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;
943
944 skb = alloc_skb(256, GFP_ATOMIC);
945 if (!skb)
946 goto nomem;
947 __skb_put(skb, len);
948 skb_copy_to_linear_data(skb, &rsp[1], len);
949 } else if (gl == CXGB4_MSG_AN) {
950 const struct rsp_ctrl *rc = (void *)rsp;
951
952 u32 qid = be32_to_cpu(rc->pldbuflen_qid);
953 c4iw_ev_handler(dev, qid);
954 return 0;
955 } else if (unlikely(*(u8 *)rsp != *(u8 *)gl->va)) {
956 if (recv_rx_pkt(dev, gl, rsp))
957 return 0;
958
959 pr_info("%s: unexpected FL contents at %p, " \
960 "RSS %#llx, FL %#llx, len %u\n",
961 pci_name(ctx->lldi.pdev), gl->va,
962 (unsigned long long)be64_to_cpu(*rsp),
963 (unsigned long long)be64_to_cpu(
964 *(__force __be64 *)gl->va),
965 gl->tot_len);
966
967 return 0;
968 } else {
969 skb = cxgb4_pktgl_to_skb(gl, 128, 128);
970 if (unlikely(!skb))
971 goto nomem;
972 }
973
974 opcode = *(u8 *)rsp;
975 if (c4iw_handlers[opcode]) {
976 c4iw_handlers[opcode](dev, skb);
977 } else {
978 pr_info("%s no handler opcode 0x%x...\n", __func__,
979 opcode);
980 kfree_skb(skb);
981 }
982
983 return 0;
984 nomem:
985 return -1;
986 }
987
988 static int c4iw_uld_state_change(void *handle, enum cxgb4_state new_state)
989 {
990 struct uld_ctx *ctx = handle;
991
992 PDBG("%s new_state %u\n", __func__, new_state);
993 switch (new_state) {
994 case CXGB4_STATE_UP:
995 printk(KERN_INFO MOD "%s: Up\n", pci_name(ctx->lldi.pdev));
996 if (!ctx->dev) {
997 int ret;
998
999 ctx->dev = c4iw_alloc(&ctx->lldi);
1000 if (IS_ERR(ctx->dev)) {
1001 printk(KERN_ERR MOD
1002 "%s: initialization failed: %ld\n",
1003 pci_name(ctx->lldi.pdev),
1004 PTR_ERR(ctx->dev));
1005 ctx->dev = NULL;
1006 break;
1007 }
1008 ret = c4iw_register_device(ctx->dev);
1009 if (ret) {
1010 printk(KERN_ERR MOD
1011 "%s: RDMA registration failed: %d\n",
1012 pci_name(ctx->lldi.pdev), ret);
1013 c4iw_dealloc(ctx);
1014 }
1015 }
1016 break;
1017 case CXGB4_STATE_DOWN:
1018 printk(KERN_INFO MOD "%s: Down\n",
1019 pci_name(ctx->lldi.pdev));
1020 if (ctx->dev)
1021 c4iw_remove(ctx);
1022 break;
1023 case CXGB4_STATE_START_RECOVERY:
1024 printk(KERN_INFO MOD "%s: Fatal Error\n",
1025 pci_name(ctx->lldi.pdev));
1026 if (ctx->dev) {
1027 struct ib_event event;
1028
1029 ctx->dev->rdev.flags |= T4_FATAL_ERROR;
1030 memset(&event, 0, sizeof event);
1031 event.event = IB_EVENT_DEVICE_FATAL;
1032 event.device = &ctx->dev->ibdev;
1033 ib_dispatch_event(&event);
1034 c4iw_remove(ctx);
1035 }
1036 break;
1037 case CXGB4_STATE_DETACH:
1038 printk(KERN_INFO MOD "%s: Detach\n",
1039 pci_name(ctx->lldi.pdev));
1040 if (ctx->dev)
1041 c4iw_remove(ctx);
1042 break;
1043 }
1044 return 0;
1045 }
1046
1047 static int disable_qp_db(int id, void *p, void *data)
1048 {
1049 struct c4iw_qp *qp = p;
1050
1051 t4_disable_wq_db(&qp->wq);
1052 return 0;
1053 }
1054
1055 static void stop_queues(struct uld_ctx *ctx)
1056 {
1057 unsigned long flags;
1058
1059 spin_lock_irqsave(&ctx->dev->lock, flags);
1060 ctx->dev->rdev.stats.db_state_transitions++;
1061 ctx->dev->db_state = STOPPED;
1062 if (ctx->dev->rdev.flags & T4_STATUS_PAGE_DISABLED)
1063 idr_for_each(&ctx->dev->qpidr, disable_qp_db, NULL);
1064 else
1065 ctx->dev->rdev.status_page->db_off = 1;
1066 spin_unlock_irqrestore(&ctx->dev->lock, flags);
1067 }
1068
1069 static int enable_qp_db(int id, void *p, void *data)
1070 {
1071 struct c4iw_qp *qp = p;
1072
1073 t4_enable_wq_db(&qp->wq);
1074 return 0;
1075 }
1076
1077 static void resume_rc_qp(struct c4iw_qp *qp)
1078 {
1079 spin_lock(&qp->lock);
1080 t4_ring_sq_db(&qp->wq, qp->wq.sq.wq_pidx_inc,
1081 is_t5(qp->rhp->rdev.lldi.adapter_type), NULL);
1082 qp->wq.sq.wq_pidx_inc = 0;
1083 t4_ring_rq_db(&qp->wq, qp->wq.rq.wq_pidx_inc,
1084 is_t5(qp->rhp->rdev.lldi.adapter_type), NULL);
1085 qp->wq.rq.wq_pidx_inc = 0;
1086 spin_unlock(&qp->lock);
1087 }
1088
1089 static void resume_a_chunk(struct uld_ctx *ctx)
1090 {
1091 int i;
1092 struct c4iw_qp *qp;
1093
1094 for (i = 0; i < DB_FC_RESUME_SIZE; i++) {
1095 qp = list_first_entry(&ctx->dev->db_fc_list, struct c4iw_qp,
1096 db_fc_entry);
1097 list_del_init(&qp->db_fc_entry);
1098 resume_rc_qp(qp);
1099 if (list_empty(&ctx->dev->db_fc_list))
1100 break;
1101 }
1102 }
1103
1104 static void resume_queues(struct uld_ctx *ctx)
1105 {
1106 spin_lock_irq(&ctx->dev->lock);
1107 if (ctx->dev->db_state != STOPPED)
1108 goto out;
1109 ctx->dev->db_state = FLOW_CONTROL;
1110 while (1) {
1111 if (list_empty(&ctx->dev->db_fc_list)) {
1112 WARN_ON(ctx->dev->db_state != FLOW_CONTROL);
1113 ctx->dev->db_state = NORMAL;
1114 ctx->dev->rdev.stats.db_state_transitions++;
1115 if (ctx->dev->rdev.flags & T4_STATUS_PAGE_DISABLED) {
1116 idr_for_each(&ctx->dev->qpidr, enable_qp_db,
1117 NULL);
1118 } else {
1119 ctx->dev->rdev.status_page->db_off = 0;
1120 }
1121 break;
1122 } else {
1123 if (cxgb4_dbfifo_count(ctx->dev->rdev.lldi.ports[0], 1)
1124 < (ctx->dev->rdev.lldi.dbfifo_int_thresh <<
1125 DB_FC_DRAIN_THRESH)) {
1126 resume_a_chunk(ctx);
1127 }
1128 if (!list_empty(&ctx->dev->db_fc_list)) {
1129 spin_unlock_irq(&ctx->dev->lock);
1130 if (DB_FC_RESUME_DELAY) {
1131 set_current_state(TASK_UNINTERRUPTIBLE);
1132 schedule_timeout(DB_FC_RESUME_DELAY);
1133 }
1134 spin_lock_irq(&ctx->dev->lock);
1135 if (ctx->dev->db_state != FLOW_CONTROL)
1136 break;
1137 }
1138 }
1139 }
1140 out:
1141 if (ctx->dev->db_state != NORMAL)
1142 ctx->dev->rdev.stats.db_fc_interruptions++;
1143 spin_unlock_irq(&ctx->dev->lock);
1144 }
1145
1146 struct qp_list {
1147 unsigned idx;
1148 struct c4iw_qp **qps;
1149 };
1150
1151 static int add_and_ref_qp(int id, void *p, void *data)
1152 {
1153 struct qp_list *qp_listp = data;
1154 struct c4iw_qp *qp = p;
1155
1156 c4iw_qp_add_ref(&qp->ibqp);
1157 qp_listp->qps[qp_listp->idx++] = qp;
1158 return 0;
1159 }
1160
1161 static int count_qps(int id, void *p, void *data)
1162 {
1163 unsigned *countp = data;
1164 (*countp)++;
1165 return 0;
1166 }
1167
1168 static void deref_qps(struct qp_list *qp_list)
1169 {
1170 int idx;
1171
1172 for (idx = 0; idx < qp_list->idx; idx++)
1173 c4iw_qp_rem_ref(&qp_list->qps[idx]->ibqp);
1174 }
1175
1176 static void recover_lost_dbs(struct uld_ctx *ctx, struct qp_list *qp_list)
1177 {
1178 int idx;
1179 int ret;
1180
1181 for (idx = 0; idx < qp_list->idx; idx++) {
1182 struct c4iw_qp *qp = qp_list->qps[idx];
1183
1184 spin_lock_irq(&qp->rhp->lock);
1185 spin_lock(&qp->lock);
1186 ret = cxgb4_sync_txq_pidx(qp->rhp->rdev.lldi.ports[0],
1187 qp->wq.sq.qid,
1188 t4_sq_host_wq_pidx(&qp->wq),
1189 t4_sq_wq_size(&qp->wq));
1190 if (ret) {
1191 pr_err(KERN_ERR MOD "%s: Fatal error - "
1192 "DB overflow recovery failed - "
1193 "error syncing SQ qid %u\n",
1194 pci_name(ctx->lldi.pdev), qp->wq.sq.qid);
1195 spin_unlock(&qp->lock);
1196 spin_unlock_irq(&qp->rhp->lock);
1197 return;
1198 }
1199 qp->wq.sq.wq_pidx_inc = 0;
1200
1201 ret = cxgb4_sync_txq_pidx(qp->rhp->rdev.lldi.ports[0],
1202 qp->wq.rq.qid,
1203 t4_rq_host_wq_pidx(&qp->wq),
1204 t4_rq_wq_size(&qp->wq));
1205
1206 if (ret) {
1207 pr_err(KERN_ERR MOD "%s: Fatal error - "
1208 "DB overflow recovery failed - "
1209 "error syncing RQ qid %u\n",
1210 pci_name(ctx->lldi.pdev), qp->wq.rq.qid);
1211 spin_unlock(&qp->lock);
1212 spin_unlock_irq(&qp->rhp->lock);
1213 return;
1214 }
1215 qp->wq.rq.wq_pidx_inc = 0;
1216 spin_unlock(&qp->lock);
1217 spin_unlock_irq(&qp->rhp->lock);
1218
1219 /* Wait for the dbfifo to drain */
1220 while (cxgb4_dbfifo_count(qp->rhp->rdev.lldi.ports[0], 1) > 0) {
1221 set_current_state(TASK_UNINTERRUPTIBLE);
1222 schedule_timeout(usecs_to_jiffies(10));
1223 }
1224 }
1225 }
1226
1227 static void recover_queues(struct uld_ctx *ctx)
1228 {
1229 int count = 0;
1230 struct qp_list qp_list;
1231 int ret;
1232
1233 /* slow everybody down */
1234 set_current_state(TASK_UNINTERRUPTIBLE);
1235 schedule_timeout(usecs_to_jiffies(1000));
1236
1237 /* flush the SGE contexts */
1238 ret = cxgb4_flush_eq_cache(ctx->dev->rdev.lldi.ports[0]);
1239 if (ret) {
1240 printk(KERN_ERR MOD "%s: Fatal error - DB overflow recovery failed\n",
1241 pci_name(ctx->lldi.pdev));
1242 return;
1243 }
1244
1245 /* Count active queues so we can build a list of queues to recover */
1246 spin_lock_irq(&ctx->dev->lock);
1247 WARN_ON(ctx->dev->db_state != STOPPED);
1248 ctx->dev->db_state = RECOVERY;
1249 idr_for_each(&ctx->dev->qpidr, count_qps, &count);
1250
1251 qp_list.qps = kzalloc(count * sizeof *qp_list.qps, GFP_ATOMIC);
1252 if (!qp_list.qps) {
1253 printk(KERN_ERR MOD "%s: Fatal error - DB overflow recovery failed\n",
1254 pci_name(ctx->lldi.pdev));
1255 spin_unlock_irq(&ctx->dev->lock);
1256 return;
1257 }
1258 qp_list.idx = 0;
1259
1260 /* add and ref each qp so it doesn't get freed */
1261 idr_for_each(&ctx->dev->qpidr, add_and_ref_qp, &qp_list);
1262
1263 spin_unlock_irq(&ctx->dev->lock);
1264
1265 /* now traverse the list in a safe context to recover the db state*/
1266 recover_lost_dbs(ctx, &qp_list);
1267
1268 /* we're almost done! deref the qps and clean up */
1269 deref_qps(&qp_list);
1270 kfree(qp_list.qps);
1271
1272 spin_lock_irq(&ctx->dev->lock);
1273 WARN_ON(ctx->dev->db_state != RECOVERY);
1274 ctx->dev->db_state = STOPPED;
1275 spin_unlock_irq(&ctx->dev->lock);
1276 }
1277
1278 static int c4iw_uld_control(void *handle, enum cxgb4_control control, ...)
1279 {
1280 struct uld_ctx *ctx = handle;
1281
1282 switch (control) {
1283 case CXGB4_CONTROL_DB_FULL:
1284 stop_queues(ctx);
1285 ctx->dev->rdev.stats.db_full++;
1286 break;
1287 case CXGB4_CONTROL_DB_EMPTY:
1288 resume_queues(ctx);
1289 mutex_lock(&ctx->dev->rdev.stats.lock);
1290 ctx->dev->rdev.stats.db_empty++;
1291 mutex_unlock(&ctx->dev->rdev.stats.lock);
1292 break;
1293 case CXGB4_CONTROL_DB_DROP:
1294 recover_queues(ctx);
1295 mutex_lock(&ctx->dev->rdev.stats.lock);
1296 ctx->dev->rdev.stats.db_drop++;
1297 mutex_unlock(&ctx->dev->rdev.stats.lock);
1298 break;
1299 default:
1300 printk(KERN_WARNING MOD "%s: unknown control cmd %u\n",
1301 pci_name(ctx->lldi.pdev), control);
1302 break;
1303 }
1304 return 0;
1305 }
1306
1307 static struct cxgb4_uld_info c4iw_uld_info = {
1308 .name = DRV_NAME,
1309 .add = c4iw_uld_add,
1310 .rx_handler = c4iw_uld_rx_handler,
1311 .state_change = c4iw_uld_state_change,
1312 .control = c4iw_uld_control,
1313 };
1314
1315 static int __init c4iw_init_module(void)
1316 {
1317 int err;
1318
1319 err = c4iw_cm_init();
1320 if (err)
1321 return err;
1322
1323 c4iw_debugfs_root = debugfs_create_dir(DRV_NAME, NULL);
1324 if (!c4iw_debugfs_root)
1325 printk(KERN_WARNING MOD
1326 "could not create debugfs entry, continuing\n");
1327
1328 if (ibnl_add_client(RDMA_NL_C4IW, RDMA_NL_IWPM_NUM_OPS,
1329 c4iw_nl_cb_table))
1330 pr_err("%s[%u]: Failed to add netlink callback\n"
1331 , __func__, __LINE__);
1332
1333 cxgb4_register_uld(CXGB4_ULD_RDMA, &c4iw_uld_info);
1334
1335 return 0;
1336 }
1337
1338 static void __exit c4iw_exit_module(void)
1339 {
1340 struct uld_ctx *ctx, *tmp;
1341
1342 mutex_lock(&dev_mutex);
1343 list_for_each_entry_safe(ctx, tmp, &uld_ctx_list, entry) {
1344 if (ctx->dev)
1345 c4iw_remove(ctx);
1346 kfree(ctx);
1347 }
1348 mutex_unlock(&dev_mutex);
1349 cxgb4_unregister_uld(CXGB4_ULD_RDMA);
1350 ibnl_remove_client(RDMA_NL_C4IW);
1351 c4iw_cm_term();
1352 debugfs_remove_recursive(c4iw_debugfs_root);
1353 }
1354
1355 module_init(c4iw_init_module);
1356 module_exit(c4iw_exit_module);
Linux kernel - Deliverables
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