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