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 static struct dentry *c4iw_debugfs_root;
68
69 struct c4iw_debugfs_data {
70 struct c4iw_dev *devp;
71 char *buf;
72 int bufsize;
73 int pos;
74 };
75
count_idrs(int id,void * p,void * data)76 static int count_idrs(int id, void *p, void *data)
77 {
78 int *countp = data;
79
80 *countp = *countp + 1;
81 return 0;
82 }
83
debugfs_read(struct file * file,char __user * buf,size_t count,loff_t * ppos)84 static ssize_t debugfs_read(struct file *file, char __user *buf, size_t count,
85 loff_t *ppos)
86 {
87 struct c4iw_debugfs_data *d = file->private_data;
88
89 return simple_read_from_buffer(buf, count, ppos, d->buf, d->pos);
90 }
91
dump_qp(int id,void * p,void * data)92 static int dump_qp(int id, void *p, void *data)
93 {
94 struct c4iw_qp *qp = p;
95 struct c4iw_debugfs_data *qpd = data;
96 int space;
97 int cc;
98
99 if (id != qp->wq.sq.qid)
100 return 0;
101
102 space = qpd->bufsize - qpd->pos - 1;
103 if (space == 0)
104 return 1;
105
106 if (qp->ep)
107 cc = snprintf(qpd->buf + qpd->pos, space,
108 "qp sq id %u rq id %u state %u onchip %u "
109 "ep tid %u state %u %pI4:%u->%pI4:%u\n",
110 qp->wq.sq.qid, qp->wq.rq.qid, (int)qp->attr.state,
111 qp->wq.sq.flags & T4_SQ_ONCHIP,
112 qp->ep->hwtid, (int)qp->ep->com.state,
113 &qp->ep->com.local_addr.sin_addr.s_addr,
114 ntohs(qp->ep->com.local_addr.sin_port),
115 &qp->ep->com.remote_addr.sin_addr.s_addr,
116 ntohs(qp->ep->com.remote_addr.sin_port));
117 else
118 cc = snprintf(qpd->buf + qpd->pos, space,
119 "qp sq id %u rq id %u state %u onchip %u\n",
120 qp->wq.sq.qid, qp->wq.rq.qid,
121 (int)qp->attr.state,
122 qp->wq.sq.flags & T4_SQ_ONCHIP);
123 if (cc < space)
124 qpd->pos += cc;
125 return 0;
126 }
127
qp_release(struct inode * inode,struct file * file)128 static int qp_release(struct inode *inode, struct file *file)
129 {
130 struct c4iw_debugfs_data *qpd = file->private_data;
131 if (!qpd) {
132 printk(KERN_INFO "%s null qpd?\n", __func__);
133 return 0;
134 }
135 vfree(qpd->buf);
136 kfree(qpd);
137 return 0;
138 }
139
qp_open(struct inode * inode,struct file * file)140 static int qp_open(struct inode *inode, struct file *file)
141 {
142 struct c4iw_debugfs_data *qpd;
143 int ret = 0;
144 int count = 1;
145
146 qpd = kmalloc(sizeof *qpd, GFP_KERNEL);
147 if (!qpd) {
148 ret = -ENOMEM;
149 goto out;
150 }
151 qpd->devp = inode->i_private;
152 qpd->pos = 0;
153
154 spin_lock_irq(&qpd->devp->lock);
155 idr_for_each(&qpd->devp->qpidr, count_idrs, &count);
156 spin_unlock_irq(&qpd->devp->lock);
157
158 qpd->bufsize = count * 128;
159 qpd->buf = vmalloc(qpd->bufsize);
160 if (!qpd->buf) {
161 ret = -ENOMEM;
162 goto err1;
163 }
164
165 spin_lock_irq(&qpd->devp->lock);
166 idr_for_each(&qpd->devp->qpidr, dump_qp, qpd);
167 spin_unlock_irq(&qpd->devp->lock);
168
169 qpd->buf[qpd->pos++] = 0;
170 file->private_data = qpd;
171 goto out;
172 err1:
173 kfree(qpd);
174 out:
175 return ret;
176 }
177
178 static const struct file_operations qp_debugfs_fops = {
179 .owner = THIS_MODULE,
180 .open = qp_open,
181 .release = qp_release,
182 .read = debugfs_read,
183 .llseek = default_llseek,
184 };
185
dump_stag(int id,void * p,void * data)186 static int dump_stag(int id, void *p, void *data)
187 {
188 struct c4iw_debugfs_data *stagd = data;
189 int space;
190 int cc;
191
192 space = stagd->bufsize - stagd->pos - 1;
193 if (space == 0)
194 return 1;
195
196 cc = snprintf(stagd->buf + stagd->pos, space, "0x%x\n", id<<8);
197 if (cc < space)
198 stagd->pos += cc;
199 return 0;
200 }
201
stag_release(struct inode * inode,struct file * file)202 static int stag_release(struct inode *inode, struct file *file)
203 {
204 struct c4iw_debugfs_data *stagd = file->private_data;
205 if (!stagd) {
206 printk(KERN_INFO "%s null stagd?\n", __func__);
207 return 0;
208 }
209 kfree(stagd->buf);
210 kfree(stagd);
211 return 0;
212 }
213
stag_open(struct inode * inode,struct file * file)214 static int stag_open(struct inode *inode, struct file *file)
215 {
216 struct c4iw_debugfs_data *stagd;
217 int ret = 0;
218 int count = 1;
219
220 stagd = kmalloc(sizeof *stagd, GFP_KERNEL);
221 if (!stagd) {
222 ret = -ENOMEM;
223 goto out;
224 }
225 stagd->devp = inode->i_private;
226 stagd->pos = 0;
227
228 spin_lock_irq(&stagd->devp->lock);
229 idr_for_each(&stagd->devp->mmidr, count_idrs, &count);
230 spin_unlock_irq(&stagd->devp->lock);
231
232 stagd->bufsize = count * sizeof("0x12345678\n");
233 stagd->buf = kmalloc(stagd->bufsize, GFP_KERNEL);
234 if (!stagd->buf) {
235 ret = -ENOMEM;
236 goto err1;
237 }
238
239 spin_lock_irq(&stagd->devp->lock);
240 idr_for_each(&stagd->devp->mmidr, dump_stag, stagd);
241 spin_unlock_irq(&stagd->devp->lock);
242
243 stagd->buf[stagd->pos++] = 0;
244 file->private_data = stagd;
245 goto out;
246 err1:
247 kfree(stagd);
248 out:
249 return ret;
250 }
251
252 static const struct file_operations stag_debugfs_fops = {
253 .owner = THIS_MODULE,
254 .open = stag_open,
255 .release = stag_release,
256 .read = debugfs_read,
257 .llseek = default_llseek,
258 };
259
260 static char *db_state_str[] = {"NORMAL", "FLOW_CONTROL", "RECOVERY"};
261
stats_show(struct seq_file * seq,void * v)262 static int stats_show(struct seq_file *seq, void *v)
263 {
264 struct c4iw_dev *dev = seq->private;
265
266 seq_printf(seq, " Object: %10s %10s %10s %10s\n", "Total", "Current",
267 "Max", "Fail");
268 seq_printf(seq, " PDID: %10llu %10llu %10llu %10llu\n",
269 dev->rdev.stats.pd.total, dev->rdev.stats.pd.cur,
270 dev->rdev.stats.pd.max, dev->rdev.stats.pd.fail);
271 seq_printf(seq, " QID: %10llu %10llu %10llu %10llu\n",
272 dev->rdev.stats.qid.total, dev->rdev.stats.qid.cur,
273 dev->rdev.stats.qid.max, dev->rdev.stats.qid.fail);
274 seq_printf(seq, " TPTMEM: %10llu %10llu %10llu %10llu\n",
275 dev->rdev.stats.stag.total, dev->rdev.stats.stag.cur,
276 dev->rdev.stats.stag.max, dev->rdev.stats.stag.fail);
277 seq_printf(seq, " PBLMEM: %10llu %10llu %10llu %10llu\n",
278 dev->rdev.stats.pbl.total, dev->rdev.stats.pbl.cur,
279 dev->rdev.stats.pbl.max, dev->rdev.stats.pbl.fail);
280 seq_printf(seq, " RQTMEM: %10llu %10llu %10llu %10llu\n",
281 dev->rdev.stats.rqt.total, dev->rdev.stats.rqt.cur,
282 dev->rdev.stats.rqt.max, dev->rdev.stats.rqt.fail);
283 seq_printf(seq, " OCQPMEM: %10llu %10llu %10llu %10llu\n",
284 dev->rdev.stats.ocqp.total, dev->rdev.stats.ocqp.cur,
285 dev->rdev.stats.ocqp.max, dev->rdev.stats.ocqp.fail);
286 seq_printf(seq, " DB FULL: %10llu\n", dev->rdev.stats.db_full);
287 seq_printf(seq, " DB EMPTY: %10llu\n", dev->rdev.stats.db_empty);
288 seq_printf(seq, " DB DROP: %10llu\n", dev->rdev.stats.db_drop);
289 seq_printf(seq, " DB State: %s Transitions %llu\n",
290 db_state_str[dev->db_state],
291 dev->rdev.stats.db_state_transitions);
292 seq_printf(seq, "TCAM_FULL: %10llu\n", dev->rdev.stats.tcam_full);
293 seq_printf(seq, "ACT_OFLD_CONN_FAILS: %10llu\n",
294 dev->rdev.stats.act_ofld_conn_fails);
295 seq_printf(seq, "PAS_OFLD_CONN_FAILS: %10llu\n",
296 dev->rdev.stats.pas_ofld_conn_fails);
297 return 0;
298 }
299
stats_open(struct inode * inode,struct file * file)300 static int stats_open(struct inode *inode, struct file *file)
301 {
302 return single_open(file, stats_show, inode->i_private);
303 }
304
stats_clear(struct file * file,const char __user * buf,size_t count,loff_t * pos)305 static ssize_t stats_clear(struct file *file, const char __user *buf,
306 size_t count, loff_t *pos)
307 {
308 struct c4iw_dev *dev = ((struct seq_file *)file->private_data)->private;
309
310 mutex_lock(&dev->rdev.stats.lock);
311 dev->rdev.stats.pd.max = 0;
312 dev->rdev.stats.pd.fail = 0;
313 dev->rdev.stats.qid.max = 0;
314 dev->rdev.stats.qid.fail = 0;
315 dev->rdev.stats.stag.max = 0;
316 dev->rdev.stats.stag.fail = 0;
317 dev->rdev.stats.pbl.max = 0;
318 dev->rdev.stats.pbl.fail = 0;
319 dev->rdev.stats.rqt.max = 0;
320 dev->rdev.stats.rqt.fail = 0;
321 dev->rdev.stats.ocqp.max = 0;
322 dev->rdev.stats.ocqp.fail = 0;
323 dev->rdev.stats.db_full = 0;
324 dev->rdev.stats.db_empty = 0;
325 dev->rdev.stats.db_drop = 0;
326 dev->rdev.stats.db_state_transitions = 0;
327 dev->rdev.stats.tcam_full = 0;
328 dev->rdev.stats.act_ofld_conn_fails = 0;
329 dev->rdev.stats.pas_ofld_conn_fails = 0;
330 mutex_unlock(&dev->rdev.stats.lock);
331 return count;
332 }
333
334 static const struct file_operations stats_debugfs_fops = {
335 .owner = THIS_MODULE,
336 .open = stats_open,
337 .release = single_release,
338 .read = seq_read,
339 .llseek = seq_lseek,
340 .write = stats_clear,
341 };
342
dump_ep(int id,void * p,void * data)343 static int dump_ep(int id, void *p, void *data)
344 {
345 struct c4iw_ep *ep = p;
346 struct c4iw_debugfs_data *epd = data;
347 int space;
348 int cc;
349
350 space = epd->bufsize - epd->pos - 1;
351 if (space == 0)
352 return 1;
353
354 cc = snprintf(epd->buf + epd->pos, space,
355 "ep %p cm_id %p qp %p state %d flags 0x%lx history 0x%lx "
356 "hwtid %d atid %d %pI4:%d <-> %pI4:%d\n",
357 ep, ep->com.cm_id, ep->com.qp, (int)ep->com.state,
358 ep->com.flags, ep->com.history, ep->hwtid, ep->atid,
359 &ep->com.local_addr.sin_addr.s_addr,
360 ntohs(ep->com.local_addr.sin_port),
361 &ep->com.remote_addr.sin_addr.s_addr,
362 ntohs(ep->com.remote_addr.sin_port));
363 if (cc < space)
364 epd->pos += cc;
365 return 0;
366 }
367
dump_listen_ep(int id,void * p,void * data)368 static int dump_listen_ep(int id, void *p, void *data)
369 {
370 struct c4iw_listen_ep *ep = p;
371 struct c4iw_debugfs_data *epd = data;
372 int space;
373 int cc;
374
375 space = epd->bufsize - epd->pos - 1;
376 if (space == 0)
377 return 1;
378
379 cc = snprintf(epd->buf + epd->pos, space,
380 "ep %p cm_id %p state %d flags 0x%lx stid %d backlog %d "
381 "%pI4:%d\n", ep, ep->com.cm_id, (int)ep->com.state,
382 ep->com.flags, ep->stid, ep->backlog,
383 &ep->com.local_addr.sin_addr.s_addr,
384 ntohs(ep->com.local_addr.sin_port));
385 if (cc < space)
386 epd->pos += cc;
387 return 0;
388 }
389
ep_release(struct inode * inode,struct file * file)390 static int ep_release(struct inode *inode, struct file *file)
391 {
392 struct c4iw_debugfs_data *epd = file->private_data;
393 if (!epd) {
394 pr_info("%s null qpd?\n", __func__);
395 return 0;
396 }
397 vfree(epd->buf);
398 kfree(epd);
399 return 0;
400 }
401
ep_open(struct inode * inode,struct file * file)402 static int ep_open(struct inode *inode, struct file *file)
403 {
404 struct c4iw_debugfs_data *epd;
405 int ret = 0;
406 int count = 1;
407
408 epd = kmalloc(sizeof(*epd), GFP_KERNEL);
409 if (!epd) {
410 ret = -ENOMEM;
411 goto out;
412 }
413 epd->devp = inode->i_private;
414 epd->pos = 0;
415
416 spin_lock_irq(&epd->devp->lock);
417 idr_for_each(&epd->devp->hwtid_idr, count_idrs, &count);
418 idr_for_each(&epd->devp->atid_idr, count_idrs, &count);
419 idr_for_each(&epd->devp->stid_idr, count_idrs, &count);
420 spin_unlock_irq(&epd->devp->lock);
421
422 epd->bufsize = count * 160;
423 epd->buf = vmalloc(epd->bufsize);
424 if (!epd->buf) {
425 ret = -ENOMEM;
426 goto err1;
427 }
428
429 spin_lock_irq(&epd->devp->lock);
430 idr_for_each(&epd->devp->hwtid_idr, dump_ep, epd);
431 idr_for_each(&epd->devp->atid_idr, dump_ep, epd);
432 idr_for_each(&epd->devp->stid_idr, dump_listen_ep, epd);
433 spin_unlock_irq(&epd->devp->lock);
434
435 file->private_data = epd;
436 goto out;
437 err1:
438 kfree(epd);
439 out:
440 return ret;
441 }
442
443 static const struct file_operations ep_debugfs_fops = {
444 .owner = THIS_MODULE,
445 .open = ep_open,
446 .release = ep_release,
447 .read = debugfs_read,
448 };
449
setup_debugfs(struct c4iw_dev * devp)450 static int setup_debugfs(struct c4iw_dev *devp)
451 {
452 struct dentry *de;
453
454 if (!devp->debugfs_root)
455 return -1;
456
457 de = debugfs_create_file("qps", S_IWUSR, devp->debugfs_root,
458 (void *)devp, &qp_debugfs_fops);
459 if (de && de->d_inode)
460 de->d_inode->i_size = 4096;
461
462 de = debugfs_create_file("stags", S_IWUSR, devp->debugfs_root,
463 (void *)devp, &stag_debugfs_fops);
464 if (de && de->d_inode)
465 de->d_inode->i_size = 4096;
466
467 de = debugfs_create_file("stats", S_IWUSR, devp->debugfs_root,
468 (void *)devp, &stats_debugfs_fops);
469 if (de && de->d_inode)
470 de->d_inode->i_size = 4096;
471
472 de = debugfs_create_file("eps", S_IWUSR, devp->debugfs_root,
473 (void *)devp, &ep_debugfs_fops);
474 if (de && de->d_inode)
475 de->d_inode->i_size = 4096;
476
477 return 0;
478 }
479
c4iw_release_dev_ucontext(struct c4iw_rdev * rdev,struct c4iw_dev_ucontext * uctx)480 void c4iw_release_dev_ucontext(struct c4iw_rdev *rdev,
481 struct c4iw_dev_ucontext *uctx)
482 {
483 struct list_head *pos, *nxt;
484 struct c4iw_qid_list *entry;
485
486 mutex_lock(&uctx->lock);
487 list_for_each_safe(pos, nxt, &uctx->qpids) {
488 entry = list_entry(pos, struct c4iw_qid_list, entry);
489 list_del_init(&entry->entry);
490 if (!(entry->qid & rdev->qpmask)) {
491 c4iw_put_resource(&rdev->resource.qid_table,
492 entry->qid);
493 mutex_lock(&rdev->stats.lock);
494 rdev->stats.qid.cur -= rdev->qpmask + 1;
495 mutex_unlock(&rdev->stats.lock);
496 }
497 kfree(entry);
498 }
499
500 list_for_each_safe(pos, nxt, &uctx->qpids) {
501 entry = list_entry(pos, struct c4iw_qid_list, entry);
502 list_del_init(&entry->entry);
503 kfree(entry);
504 }
505 mutex_unlock(&uctx->lock);
506 }
507
c4iw_init_dev_ucontext(struct c4iw_rdev * rdev,struct c4iw_dev_ucontext * uctx)508 void c4iw_init_dev_ucontext(struct c4iw_rdev *rdev,
509 struct c4iw_dev_ucontext *uctx)
510 {
511 INIT_LIST_HEAD(&uctx->qpids);
512 INIT_LIST_HEAD(&uctx->cqids);
513 mutex_init(&uctx->lock);
514 }
515
516 /* Caller takes care of locking if needed */
c4iw_rdev_open(struct c4iw_rdev * rdev)517 static int c4iw_rdev_open(struct c4iw_rdev *rdev)
518 {
519 int err;
520
521 c4iw_init_dev_ucontext(rdev, &rdev->uctx);
522
523 /*
524 * qpshift is the number of bits to shift the qpid left in order
525 * to get the correct address of the doorbell for that qp.
526 */
527 rdev->qpshift = PAGE_SHIFT - ilog2(rdev->lldi.udb_density);
528 rdev->qpmask = rdev->lldi.udb_density - 1;
529 rdev->cqshift = PAGE_SHIFT - ilog2(rdev->lldi.ucq_density);
530 rdev->cqmask = rdev->lldi.ucq_density - 1;
531 PDBG("%s dev %s stag start 0x%0x size 0x%0x num stags %d "
532 "pbl start 0x%0x size 0x%0x rq start 0x%0x size 0x%0x "
533 "qp qid start %u size %u cq qid start %u size %u\n",
534 __func__, pci_name(rdev->lldi.pdev), rdev->lldi.vr->stag.start,
535 rdev->lldi.vr->stag.size, c4iw_num_stags(rdev),
536 rdev->lldi.vr->pbl.start,
537 rdev->lldi.vr->pbl.size, rdev->lldi.vr->rq.start,
538 rdev->lldi.vr->rq.size,
539 rdev->lldi.vr->qp.start,
540 rdev->lldi.vr->qp.size,
541 rdev->lldi.vr->cq.start,
542 rdev->lldi.vr->cq.size);
543 PDBG("udb len 0x%x udb base %p db_reg %p gts_reg %p qpshift %lu "
544 "qpmask 0x%x cqshift %lu cqmask 0x%x\n",
545 (unsigned)pci_resource_len(rdev->lldi.pdev, 2),
546 (void *)(unsigned long)pci_resource_start(rdev->lldi.pdev, 2),
547 rdev->lldi.db_reg,
548 rdev->lldi.gts_reg,
549 rdev->qpshift, rdev->qpmask,
550 rdev->cqshift, rdev->cqmask);
551
552 if (c4iw_num_stags(rdev) == 0) {
553 err = -EINVAL;
554 goto err1;
555 }
556
557 rdev->stats.pd.total = T4_MAX_NUM_PD;
558 rdev->stats.stag.total = rdev->lldi.vr->stag.size;
559 rdev->stats.pbl.total = rdev->lldi.vr->pbl.size;
560 rdev->stats.rqt.total = rdev->lldi.vr->rq.size;
561 rdev->stats.ocqp.total = rdev->lldi.vr->ocq.size;
562 rdev->stats.qid.total = rdev->lldi.vr->qp.size;
563
564 err = c4iw_init_resource(rdev, c4iw_num_stags(rdev), T4_MAX_NUM_PD);
565 if (err) {
566 printk(KERN_ERR MOD "error %d initializing resources\n", err);
567 goto err1;
568 }
569 err = c4iw_pblpool_create(rdev);
570 if (err) {
571 printk(KERN_ERR MOD "error %d initializing pbl pool\n", err);
572 goto err2;
573 }
574 err = c4iw_rqtpool_create(rdev);
575 if (err) {
576 printk(KERN_ERR MOD "error %d initializing rqt pool\n", err);
577 goto err3;
578 }
579 err = c4iw_ocqp_pool_create(rdev);
580 if (err) {
581 printk(KERN_ERR MOD "error %d initializing ocqp pool\n", err);
582 goto err4;
583 }
584 return 0;
585 err4:
586 c4iw_rqtpool_destroy(rdev);
587 err3:
588 c4iw_pblpool_destroy(rdev);
589 err2:
590 c4iw_destroy_resource(&rdev->resource);
591 err1:
592 return err;
593 }
594
c4iw_rdev_close(struct c4iw_rdev * rdev)595 static void c4iw_rdev_close(struct c4iw_rdev *rdev)
596 {
597 c4iw_pblpool_destroy(rdev);
598 c4iw_rqtpool_destroy(rdev);
599 c4iw_destroy_resource(&rdev->resource);
600 }
601
c4iw_dealloc(struct uld_ctx * ctx)602 static void c4iw_dealloc(struct uld_ctx *ctx)
603 {
604 c4iw_rdev_close(&ctx->dev->rdev);
605 idr_destroy(&ctx->dev->cqidr);
606 idr_destroy(&ctx->dev->qpidr);
607 idr_destroy(&ctx->dev->mmidr);
608 idr_destroy(&ctx->dev->hwtid_idr);
609 idr_destroy(&ctx->dev->stid_idr);
610 idr_destroy(&ctx->dev->atid_idr);
611 iounmap(ctx->dev->rdev.oc_mw_kva);
612 ib_dealloc_device(&ctx->dev->ibdev);
613 ctx->dev = NULL;
614 }
615
c4iw_remove(struct uld_ctx * ctx)616 static void c4iw_remove(struct uld_ctx *ctx)
617 {
618 PDBG("%s c4iw_dev %p\n", __func__, ctx->dev);
619 c4iw_unregister_device(ctx->dev);
620 c4iw_dealloc(ctx);
621 }
622
rdma_supported(const struct cxgb4_lld_info * infop)623 static int rdma_supported(const struct cxgb4_lld_info *infop)
624 {
625 return infop->vr->stag.size > 0 && infop->vr->pbl.size > 0 &&
626 infop->vr->rq.size > 0 && infop->vr->qp.size > 0 &&
627 infop->vr->cq.size > 0;
628 }
629
c4iw_alloc(const struct cxgb4_lld_info * infop)630 static struct c4iw_dev *c4iw_alloc(const struct cxgb4_lld_info *infop)
631 {
632 struct c4iw_dev *devp;
633 int ret;
634
635 if (!rdma_supported(infop)) {
636 printk(KERN_INFO MOD "%s: RDMA not supported on this device.\n",
637 pci_name(infop->pdev));
638 return ERR_PTR(-ENOSYS);
639 }
640 if (!ocqp_supported(infop))
641 pr_info("%s: On-Chip Queues not supported on this device.\n",
642 pci_name(infop->pdev));
643
644 if (!is_t4(infop->adapter_type)) {
645 if (!allow_db_fc_on_t5) {
646 db_fc_threshold = 100000;
647 pr_info("DB Flow Control Disabled.\n");
648 }
649
650 if (!allow_db_coalescing_on_t5) {
651 db_coalescing_threshold = -1;
652 pr_info("DB Coalescing Disabled.\n");
653 }
654 }
655
656 devp = (struct c4iw_dev *)ib_alloc_device(sizeof(*devp));
657 if (!devp) {
658 printk(KERN_ERR MOD "Cannot allocate ib device\n");
659 return ERR_PTR(-ENOMEM);
660 }
661 devp->rdev.lldi = *infop;
662
663 devp->rdev.oc_mw_pa = pci_resource_start(devp->rdev.lldi.pdev, 2) +
664 (pci_resource_len(devp->rdev.lldi.pdev, 2) -
665 roundup_pow_of_two(devp->rdev.lldi.vr->ocq.size));
666 devp->rdev.oc_mw_kva = ioremap_wc(devp->rdev.oc_mw_pa,
667 devp->rdev.lldi.vr->ocq.size);
668
669 PDBG(KERN_INFO MOD "ocq memory: "
670 "hw_start 0x%x size %u mw_pa 0x%lx mw_kva %p\n",
671 devp->rdev.lldi.vr->ocq.start, devp->rdev.lldi.vr->ocq.size,
672 devp->rdev.oc_mw_pa, devp->rdev.oc_mw_kva);
673
674 ret = c4iw_rdev_open(&devp->rdev);
675 if (ret) {
676 printk(KERN_ERR MOD "Unable to open CXIO rdev err %d\n", ret);
677 ib_dealloc_device(&devp->ibdev);
678 return ERR_PTR(ret);
679 }
680
681 idr_init(&devp->cqidr);
682 idr_init(&devp->qpidr);
683 idr_init(&devp->mmidr);
684 idr_init(&devp->hwtid_idr);
685 idr_init(&devp->stid_idr);
686 idr_init(&devp->atid_idr);
687 spin_lock_init(&devp->lock);
688 mutex_init(&devp->rdev.stats.lock);
689 mutex_init(&devp->db_mutex);
690
691 if (c4iw_debugfs_root) {
692 devp->debugfs_root = debugfs_create_dir(
693 pci_name(devp->rdev.lldi.pdev),
694 c4iw_debugfs_root);
695 setup_debugfs(devp);
696 }
697 return devp;
698 }
699
c4iw_uld_add(const struct cxgb4_lld_info * infop)700 static void *c4iw_uld_add(const struct cxgb4_lld_info *infop)
701 {
702 struct uld_ctx *ctx;
703 static int vers_printed;
704 int i;
705
706 if (!vers_printed++)
707 pr_info("Chelsio T4/T5 RDMA Driver - version %s\n",
708 DRV_VERSION);
709
710 ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
711 if (!ctx) {
712 ctx = ERR_PTR(-ENOMEM);
713 goto out;
714 }
715 ctx->lldi = *infop;
716
717 PDBG("%s found device %s nchan %u nrxq %u ntxq %u nports %u\n",
718 __func__, pci_name(ctx->lldi.pdev),
719 ctx->lldi.nchan, ctx->lldi.nrxq,
720 ctx->lldi.ntxq, ctx->lldi.nports);
721
722 mutex_lock(&dev_mutex);
723 list_add_tail(&ctx->entry, &uld_ctx_list);
724 mutex_unlock(&dev_mutex);
725
726 for (i = 0; i < ctx->lldi.nrxq; i++)
727 PDBG("rxqid[%u] %u\n", i, ctx->lldi.rxq_ids[i]);
728 out:
729 return ctx;
730 }
731
copy_gl_to_skb_pkt(const struct pkt_gl * gl,const __be64 * rsp,u32 pktshift)732 static inline struct sk_buff *copy_gl_to_skb_pkt(const struct pkt_gl *gl,
733 const __be64 *rsp,
734 u32 pktshift)
735 {
736 struct sk_buff *skb;
737
738 /*
739 * Allocate space for cpl_pass_accept_req which will be synthesized by
740 * driver. Once the driver synthesizes the request the skb will go
741 * through the regular cpl_pass_accept_req processing.
742 * The math here assumes sizeof cpl_pass_accept_req >= sizeof
743 * cpl_rx_pkt.
744 */
745 skb = alloc_skb(gl->tot_len + sizeof(struct cpl_pass_accept_req) +
746 sizeof(struct rss_header) - pktshift, GFP_ATOMIC);
747 if (unlikely(!skb))
748 return NULL;
749
750 __skb_put(skb, gl->tot_len + sizeof(struct cpl_pass_accept_req) +
751 sizeof(struct rss_header) - pktshift);
752
753 /*
754 * This skb will contain:
755 * rss_header from the rspq descriptor (1 flit)
756 * cpl_rx_pkt struct from the rspq descriptor (2 flits)
757 * space for the difference between the size of an
758 * rx_pkt and pass_accept_req cpl (1 flit)
759 * the packet data from the gl
760 */
761 skb_copy_to_linear_data(skb, rsp, sizeof(struct cpl_pass_accept_req) +
762 sizeof(struct rss_header));
763 skb_copy_to_linear_data_offset(skb, sizeof(struct rss_header) +
764 sizeof(struct cpl_pass_accept_req),
765 gl->va + pktshift,
766 gl->tot_len - pktshift);
767 return skb;
768 }
769
recv_rx_pkt(struct c4iw_dev * dev,const struct pkt_gl * gl,const __be64 * rsp)770 static inline int recv_rx_pkt(struct c4iw_dev *dev, const struct pkt_gl *gl,
771 const __be64 *rsp)
772 {
773 unsigned int opcode = *(u8 *)rsp;
774 struct sk_buff *skb;
775
776 if (opcode != CPL_RX_PKT)
777 goto out;
778
779 skb = copy_gl_to_skb_pkt(gl , rsp, dev->rdev.lldi.sge_pktshift);
780 if (skb == NULL)
781 goto out;
782
783 if (c4iw_handlers[opcode] == NULL) {
784 pr_info("%s no handler opcode 0x%x...\n", __func__,
785 opcode);
786 kfree_skb(skb);
787 goto out;
788 }
789 c4iw_handlers[opcode](dev, skb);
790 return 1;
791 out:
792 return 0;
793 }
794
c4iw_uld_rx_handler(void * handle,const __be64 * rsp,const struct pkt_gl * gl)795 static int c4iw_uld_rx_handler(void *handle, const __be64 *rsp,
796 const struct pkt_gl *gl)
797 {
798 struct uld_ctx *ctx = handle;
799 struct c4iw_dev *dev = ctx->dev;
800 struct sk_buff *skb;
801 u8 opcode;
802
803 if (gl == NULL) {
804 /* omit RSS and rsp_ctrl at end of descriptor */
805 unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;
806
807 skb = alloc_skb(256, GFP_ATOMIC);
808 if (!skb)
809 goto nomem;
810 __skb_put(skb, len);
811 skb_copy_to_linear_data(skb, &rsp[1], len);
812 } else if (gl == CXGB4_MSG_AN) {
813 const struct rsp_ctrl *rc = (void *)rsp;
814
815 u32 qid = be32_to_cpu(rc->pldbuflen_qid);
816 c4iw_ev_handler(dev, qid);
817 return 0;
818 } else if (unlikely(*(u8 *)rsp != *(u8 *)gl->va)) {
819 if (recv_rx_pkt(dev, gl, rsp))
820 return 0;
821
822 pr_info("%s: unexpected FL contents at %p, " \
823 "RSS %#llx, FL %#llx, len %u\n",
824 pci_name(ctx->lldi.pdev), gl->va,
825 (unsigned long long)be64_to_cpu(*rsp),
826 (unsigned long long)be64_to_cpu(
827 *(__force __be64 *)gl->va),
828 gl->tot_len);
829
830 return 0;
831 } else {
832 skb = cxgb4_pktgl_to_skb(gl, 128, 128);
833 if (unlikely(!skb))
834 goto nomem;
835 }
836
837 opcode = *(u8 *)rsp;
838 if (c4iw_handlers[opcode])
839 c4iw_handlers[opcode](dev, skb);
840 else
841 pr_info("%s no handler opcode 0x%x...\n", __func__,
842 opcode);
843
844 return 0;
845 nomem:
846 return -1;
847 }
848
c4iw_uld_state_change(void * handle,enum cxgb4_state new_state)849 static int c4iw_uld_state_change(void *handle, enum cxgb4_state new_state)
850 {
851 struct uld_ctx *ctx = handle;
852
853 PDBG("%s new_state %u\n", __func__, new_state);
854 switch (new_state) {
855 case CXGB4_STATE_UP:
856 printk(KERN_INFO MOD "%s: Up\n", pci_name(ctx->lldi.pdev));
857 if (!ctx->dev) {
858 int ret;
859
860 ctx->dev = c4iw_alloc(&ctx->lldi);
861 if (IS_ERR(ctx->dev)) {
862 printk(KERN_ERR MOD
863 "%s: initialization failed: %ld\n",
864 pci_name(ctx->lldi.pdev),
865 PTR_ERR(ctx->dev));
866 ctx->dev = NULL;
867 break;
868 }
869 ret = c4iw_register_device(ctx->dev);
870 if (ret) {
871 printk(KERN_ERR MOD
872 "%s: RDMA registration failed: %d\n",
873 pci_name(ctx->lldi.pdev), ret);
874 c4iw_dealloc(ctx);
875 }
876 }
877 break;
878 case CXGB4_STATE_DOWN:
879 printk(KERN_INFO MOD "%s: Down\n",
880 pci_name(ctx->lldi.pdev));
881 if (ctx->dev)
882 c4iw_remove(ctx);
883 break;
884 case CXGB4_STATE_START_RECOVERY:
885 printk(KERN_INFO MOD "%s: Fatal Error\n",
886 pci_name(ctx->lldi.pdev));
887 if (ctx->dev) {
888 struct ib_event event;
889
890 ctx->dev->rdev.flags |= T4_FATAL_ERROR;
891 memset(&event, 0, sizeof event);
892 event.event = IB_EVENT_DEVICE_FATAL;
893 event.device = &ctx->dev->ibdev;
894 ib_dispatch_event(&event);
895 c4iw_remove(ctx);
896 }
897 break;
898 case CXGB4_STATE_DETACH:
899 printk(KERN_INFO MOD "%s: Detach\n",
900 pci_name(ctx->lldi.pdev));
901 if (ctx->dev)
902 c4iw_remove(ctx);
903 break;
904 }
905 return 0;
906 }
907
disable_qp_db(int id,void * p,void * data)908 static int disable_qp_db(int id, void *p, void *data)
909 {
910 struct c4iw_qp *qp = p;
911
912 t4_disable_wq_db(&qp->wq);
913 return 0;
914 }
915
stop_queues(struct uld_ctx * ctx)916 static void stop_queues(struct uld_ctx *ctx)
917 {
918 spin_lock_irq(&ctx->dev->lock);
919 if (ctx->dev->db_state == NORMAL) {
920 ctx->dev->rdev.stats.db_state_transitions++;
921 ctx->dev->db_state = FLOW_CONTROL;
922 idr_for_each(&ctx->dev->qpidr, disable_qp_db, NULL);
923 }
924 spin_unlock_irq(&ctx->dev->lock);
925 }
926
enable_qp_db(int id,void * p,void * data)927 static int enable_qp_db(int id, void *p, void *data)
928 {
929 struct c4iw_qp *qp = p;
930
931 t4_enable_wq_db(&qp->wq);
932 return 0;
933 }
934
resume_queues(struct uld_ctx * ctx)935 static void resume_queues(struct uld_ctx *ctx)
936 {
937 spin_lock_irq(&ctx->dev->lock);
938 if (ctx->dev->qpcnt <= db_fc_threshold &&
939 ctx->dev->db_state == FLOW_CONTROL) {
940 ctx->dev->db_state = NORMAL;
941 ctx->dev->rdev.stats.db_state_transitions++;
942 idr_for_each(&ctx->dev->qpidr, enable_qp_db, NULL);
943 }
944 spin_unlock_irq(&ctx->dev->lock);
945 }
946
947 struct qp_list {
948 unsigned idx;
949 struct c4iw_qp **qps;
950 };
951
add_and_ref_qp(int id,void * p,void * data)952 static int add_and_ref_qp(int id, void *p, void *data)
953 {
954 struct qp_list *qp_listp = data;
955 struct c4iw_qp *qp = p;
956
957 c4iw_qp_add_ref(&qp->ibqp);
958 qp_listp->qps[qp_listp->idx++] = qp;
959 return 0;
960 }
961
count_qps(int id,void * p,void * data)962 static int count_qps(int id, void *p, void *data)
963 {
964 unsigned *countp = data;
965 (*countp)++;
966 return 0;
967 }
968
deref_qps(struct qp_list qp_list)969 static void deref_qps(struct qp_list qp_list)
970 {
971 int idx;
972
973 for (idx = 0; idx < qp_list.idx; idx++)
974 c4iw_qp_rem_ref(&qp_list.qps[idx]->ibqp);
975 }
976
recover_lost_dbs(struct uld_ctx * ctx,struct qp_list * qp_list)977 static void recover_lost_dbs(struct uld_ctx *ctx, struct qp_list *qp_list)
978 {
979 int idx;
980 int ret;
981
982 for (idx = 0; idx < qp_list->idx; idx++) {
983 struct c4iw_qp *qp = qp_list->qps[idx];
984
985 ret = cxgb4_sync_txq_pidx(qp->rhp->rdev.lldi.ports[0],
986 qp->wq.sq.qid,
987 t4_sq_host_wq_pidx(&qp->wq),
988 t4_sq_wq_size(&qp->wq));
989 if (ret) {
990 printk(KERN_ERR MOD "%s: Fatal error - "
991 "DB overflow recovery failed - "
992 "error syncing SQ qid %u\n",
993 pci_name(ctx->lldi.pdev), qp->wq.sq.qid);
994 return;
995 }
996
997 ret = cxgb4_sync_txq_pidx(qp->rhp->rdev.lldi.ports[0],
998 qp->wq.rq.qid,
999 t4_rq_host_wq_pidx(&qp->wq),
1000 t4_rq_wq_size(&qp->wq));
1001
1002 if (ret) {
1003 printk(KERN_ERR MOD "%s: Fatal error - "
1004 "DB overflow recovery failed - "
1005 "error syncing RQ qid %u\n",
1006 pci_name(ctx->lldi.pdev), qp->wq.rq.qid);
1007 return;
1008 }
1009
1010 /* Wait for the dbfifo to drain */
1011 while (cxgb4_dbfifo_count(qp->rhp->rdev.lldi.ports[0], 1) > 0) {
1012 set_current_state(TASK_UNINTERRUPTIBLE);
1013 schedule_timeout(usecs_to_jiffies(10));
1014 }
1015 }
1016 }
1017
recover_queues(struct uld_ctx * ctx)1018 static void recover_queues(struct uld_ctx *ctx)
1019 {
1020 int count = 0;
1021 struct qp_list qp_list;
1022 int ret;
1023
1024 /* lock out kernel db ringers */
1025 mutex_lock(&ctx->dev->db_mutex);
1026
1027 /* put all queues in to recovery mode */
1028 spin_lock_irq(&ctx->dev->lock);
1029 ctx->dev->db_state = RECOVERY;
1030 ctx->dev->rdev.stats.db_state_transitions++;
1031 idr_for_each(&ctx->dev->qpidr, disable_qp_db, NULL);
1032 spin_unlock_irq(&ctx->dev->lock);
1033
1034 /* slow everybody down */
1035 set_current_state(TASK_UNINTERRUPTIBLE);
1036 schedule_timeout(usecs_to_jiffies(1000));
1037
1038 /* Wait for the dbfifo to completely drain. */
1039 while (cxgb4_dbfifo_count(ctx->dev->rdev.lldi.ports[0], 1) > 0) {
1040 set_current_state(TASK_UNINTERRUPTIBLE);
1041 schedule_timeout(usecs_to_jiffies(10));
1042 }
1043
1044 /* flush the SGE contexts */
1045 ret = cxgb4_flush_eq_cache(ctx->dev->rdev.lldi.ports[0]);
1046 if (ret) {
1047 printk(KERN_ERR MOD "%s: Fatal error - DB overflow recovery failed\n",
1048 pci_name(ctx->lldi.pdev));
1049 goto out;
1050 }
1051
1052 /* Count active queues so we can build a list of queues to recover */
1053 spin_lock_irq(&ctx->dev->lock);
1054 idr_for_each(&ctx->dev->qpidr, count_qps, &count);
1055
1056 qp_list.qps = kzalloc(count * sizeof *qp_list.qps, GFP_ATOMIC);
1057 if (!qp_list.qps) {
1058 printk(KERN_ERR MOD "%s: Fatal error - DB overflow recovery failed\n",
1059 pci_name(ctx->lldi.pdev));
1060 spin_unlock_irq(&ctx->dev->lock);
1061 goto out;
1062 }
1063 qp_list.idx = 0;
1064
1065 /* add and ref each qp so it doesn't get freed */
1066 idr_for_each(&ctx->dev->qpidr, add_and_ref_qp, &qp_list);
1067
1068 spin_unlock_irq(&ctx->dev->lock);
1069
1070 /* now traverse the list in a safe context to recover the db state*/
1071 recover_lost_dbs(ctx, &qp_list);
1072
1073 /* we're almost done! deref the qps and clean up */
1074 deref_qps(qp_list);
1075 kfree(qp_list.qps);
1076
1077 /* Wait for the dbfifo to completely drain again */
1078 while (cxgb4_dbfifo_count(ctx->dev->rdev.lldi.ports[0], 1) > 0) {
1079 set_current_state(TASK_UNINTERRUPTIBLE);
1080 schedule_timeout(usecs_to_jiffies(10));
1081 }
1082
1083 /* resume the queues */
1084 spin_lock_irq(&ctx->dev->lock);
1085 if (ctx->dev->qpcnt > db_fc_threshold)
1086 ctx->dev->db_state = FLOW_CONTROL;
1087 else {
1088 ctx->dev->db_state = NORMAL;
1089 idr_for_each(&ctx->dev->qpidr, enable_qp_db, NULL);
1090 }
1091 ctx->dev->rdev.stats.db_state_transitions++;
1092 spin_unlock_irq(&ctx->dev->lock);
1093
1094 out:
1095 /* start up kernel db ringers again */
1096 mutex_unlock(&ctx->dev->db_mutex);
1097 }
1098
c4iw_uld_control(void * handle,enum cxgb4_control control,...)1099 static int c4iw_uld_control(void *handle, enum cxgb4_control control, ...)
1100 {
1101 struct uld_ctx *ctx = handle;
1102
1103 switch (control) {
1104 case CXGB4_CONTROL_DB_FULL:
1105 stop_queues(ctx);
1106 mutex_lock(&ctx->dev->rdev.stats.lock);
1107 ctx->dev->rdev.stats.db_full++;
1108 mutex_unlock(&ctx->dev->rdev.stats.lock);
1109 break;
1110 case CXGB4_CONTROL_DB_EMPTY:
1111 resume_queues(ctx);
1112 mutex_lock(&ctx->dev->rdev.stats.lock);
1113 ctx->dev->rdev.stats.db_empty++;
1114 mutex_unlock(&ctx->dev->rdev.stats.lock);
1115 break;
1116 case CXGB4_CONTROL_DB_DROP:
1117 recover_queues(ctx);
1118 mutex_lock(&ctx->dev->rdev.stats.lock);
1119 ctx->dev->rdev.stats.db_drop++;
1120 mutex_unlock(&ctx->dev->rdev.stats.lock);
1121 break;
1122 default:
1123 printk(KERN_WARNING MOD "%s: unknown control cmd %u\n",
1124 pci_name(ctx->lldi.pdev), control);
1125 break;
1126 }
1127 return 0;
1128 }
1129
1130 static struct cxgb4_uld_info c4iw_uld_info = {
1131 .name = DRV_NAME,
1132 .add = c4iw_uld_add,
1133 .rx_handler = c4iw_uld_rx_handler,
1134 .state_change = c4iw_uld_state_change,
1135 .control = c4iw_uld_control,
1136 };
1137
c4iw_init_module(void)1138 static int __init c4iw_init_module(void)
1139 {
1140 int err;
1141
1142 err = c4iw_cm_init();
1143 if (err)
1144 return err;
1145
1146 c4iw_debugfs_root = debugfs_create_dir(DRV_NAME, NULL);
1147 if (!c4iw_debugfs_root)
1148 printk(KERN_WARNING MOD
1149 "could not create debugfs entry, continuing\n");
1150
1151 cxgb4_register_uld(CXGB4_ULD_RDMA, &c4iw_uld_info);
1152
1153 return 0;
1154 }
1155
c4iw_exit_module(void)1156 static void __exit c4iw_exit_module(void)
1157 {
1158 struct uld_ctx *ctx, *tmp;
1159
1160 mutex_lock(&dev_mutex);
1161 list_for_each_entry_safe(ctx, tmp, &uld_ctx_list, entry) {
1162 if (ctx->dev)
1163 c4iw_remove(ctx);
1164 kfree(ctx);
1165 }
1166 mutex_unlock(&dev_mutex);
1167 cxgb4_unregister_uld(CXGB4_ULD_RDMA);
1168 c4iw_cm_term();
1169 debugfs_remove_recursive(c4iw_debugfs_root);
1170 }
1171
1172 module_init(c4iw_init_module);
1173 module_exit(c4iw_exit_module);
1174