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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / infiniband / hw / cxgb4 / device.c
blob599340c1f0b82c61171db4211532461f6a790aa7
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 #include <linux/math64.h>
37
38 #include <rdma/ib_verbs.h>
39
40 #include "iw_cxgb4.h"
41
42 #define DRV_VERSION "0.1"
43
44 MODULE_AUTHOR("Steve Wise");
45 MODULE_DESCRIPTION("Chelsio T4/T5 RDMA Driver");
46 MODULE_LICENSE("Dual BSD/GPL");
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 int c4iw_wr_log = 0;
59 module_param(c4iw_wr_log, int, 0444);
60 MODULE_PARM_DESC(c4iw_wr_log, "Enables logging of work request timing data.");
61
62 static int c4iw_wr_log_size_order = 12;
63 module_param(c4iw_wr_log_size_order, int, 0444);
64 MODULE_PARM_DESC(c4iw_wr_log_size_order,
65 "Number of entries (log2) in the work request timing log.");
66
67 static LIST_HEAD(uld_ctx_list);
68 static DEFINE_MUTEX(dev_mutex);
69 static struct workqueue_struct *reg_workq;
70
71 #define DB_FC_RESUME_SIZE 64
72 #define DB_FC_RESUME_DELAY 1
73 #define DB_FC_DRAIN_THRESH 0
74
75 static struct dentry *c4iw_debugfs_root;
76
77 struct c4iw_debugfs_data {
78 struct c4iw_dev *devp;
79 char *buf;
80 int bufsize;
81 int pos;
82 };
83
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
92 void c4iw_log_wr_stats(struct t4_wq *wq, struct t4_cqe *cqe)
93 {
94 struct wr_log_entry le;
95 int idx;
96
97 if (!wq->rdev->wr_log)
98 return;
99
100 idx = (atomic_inc_return(&wq->rdev->wr_log_idx) - 1) &
101 (wq->rdev->wr_log_size - 1);
102 le.poll_sge_ts = cxgb4_read_sge_timestamp(wq->rdev->lldi.ports[0]);
103 le.poll_host_time = ktime_get();
104 le.valid = 1;
105 le.cqe_sge_ts = CQE_TS(cqe);
106 if (SQ_TYPE(cqe)) {
107 le.qid = wq->sq.qid;
108 le.opcode = CQE_OPCODE(cqe);
109 le.post_host_time = wq->sq.sw_sq[wq->sq.cidx].host_time;
110 le.post_sge_ts = wq->sq.sw_sq[wq->sq.cidx].sge_ts;
111 le.wr_id = CQE_WRID_SQ_IDX(cqe);
112 } else {
113 le.qid = wq->rq.qid;
114 le.opcode = FW_RI_RECEIVE;
115 le.post_host_time = wq->rq.sw_rq[wq->rq.cidx].host_time;
116 le.post_sge_ts = wq->rq.sw_rq[wq->rq.cidx].sge_ts;
117 le.wr_id = CQE_WRID_MSN(cqe);
118 }
119 wq->rdev->wr_log[idx] = le;
120 }
121
122 static int wr_log_show(struct seq_file *seq, void *v)
123 {
124 struct c4iw_dev *dev = seq->private;
125 ktime_t prev_time;
126 struct wr_log_entry *lep;
127 int prev_time_set = 0;
128 int idx, end;
129
130 #define ts2ns(ts) div64_u64((ts) * dev->rdev.lldi.cclk_ps, 1000)
131
132 idx = atomic_read(&dev->rdev.wr_log_idx) &
133 (dev->rdev.wr_log_size - 1);
134 end = idx - 1;
135 if (end < 0)
136 end = dev->rdev.wr_log_size - 1;
137 lep = &dev->rdev.wr_log[idx];
138 while (idx != end) {
139 if (lep->valid) {
140 if (!prev_time_set) {
141 prev_time_set = 1;
142 prev_time = lep->poll_host_time;
143 }
144 seq_printf(seq, "%04u: nsec %llu qid %u opcode "
145 "%u %s 0x%x host_wr_delta nsec %llu "
146 "post_sge_ts 0x%llx cqe_sge_ts 0x%llx "
147 "poll_sge_ts 0x%llx post_poll_delta_ns %llu "
148 "cqe_poll_delta_ns %llu\n",
149 idx,
150 ktime_to_ns(ktime_sub(lep->poll_host_time,
151 prev_time)),
152 lep->qid, lep->opcode,
153 lep->opcode == FW_RI_RECEIVE ?
154 "msn" : "wrid",
155 lep->wr_id,
156 ktime_to_ns(ktime_sub(lep->poll_host_time,
157 lep->post_host_time)),
158 lep->post_sge_ts, lep->cqe_sge_ts,
159 lep->poll_sge_ts,
160 ts2ns(lep->poll_sge_ts - lep->post_sge_ts),
161 ts2ns(lep->poll_sge_ts - lep->cqe_sge_ts));
162 prev_time = lep->poll_host_time;
163 }
164 idx++;
165 if (idx > (dev->rdev.wr_log_size - 1))
166 idx = 0;
167 lep = &dev->rdev.wr_log[idx];
168 }
169 #undef ts2ns
170 return 0;
171 }
172
173 static int wr_log_open(struct inode *inode, struct file *file)
174 {
175 return single_open(file, wr_log_show, inode->i_private);
176 }
177
178 static ssize_t wr_log_clear(struct file *file, const char __user *buf,
179 size_t count, loff_t *pos)
180 {
181 struct c4iw_dev *dev = ((struct seq_file *)file->private_data)->private;
182 int i;
183
184 if (dev->rdev.wr_log)
185 for (i = 0; i < dev->rdev.wr_log_size; i++)
186 dev->rdev.wr_log[i].valid = 0;
187 return count;
188 }
189
190 static const struct file_operations wr_log_debugfs_fops = {
191 .owner = THIS_MODULE,
192 .open = wr_log_open,
193 .release = single_release,
194 .read = seq_read,
195 .llseek = seq_lseek,
196 .write = wr_log_clear,
197 };
198
199 static struct sockaddr_in zero_sin = {
200 .sin_family = AF_INET,
201 };
202
203 static struct sockaddr_in6 zero_sin6 = {
204 .sin6_family = AF_INET6,
205 };
206
207 static void set_ep_sin_addrs(struct c4iw_ep *ep,
208 struct sockaddr_in **lsin,
209 struct sockaddr_in **rsin,
210 struct sockaddr_in **m_lsin,
211 struct sockaddr_in **m_rsin)
212 {
213 struct iw_cm_id *id = ep->com.cm_id;
214
215 *m_lsin = (struct sockaddr_in *)&ep->com.local_addr;
216 *m_rsin = (struct sockaddr_in *)&ep->com.remote_addr;
217 if (id) {
218 *lsin = (struct sockaddr_in *)&id->local_addr;
219 *rsin = (struct sockaddr_in *)&id->remote_addr;
220 } else {
221 *lsin = &zero_sin;
222 *rsin = &zero_sin;
223 }
224 }
225
226 static void set_ep_sin6_addrs(struct c4iw_ep *ep,
227 struct sockaddr_in6 **lsin6,
228 struct sockaddr_in6 **rsin6,
229 struct sockaddr_in6 **m_lsin6,
230 struct sockaddr_in6 **m_rsin6)
231 {
232 struct iw_cm_id *id = ep->com.cm_id;
233
234 *m_lsin6 = (struct sockaddr_in6 *)&ep->com.local_addr;
235 *m_rsin6 = (struct sockaddr_in6 *)&ep->com.remote_addr;
236 if (id) {
237 *lsin6 = (struct sockaddr_in6 *)&id->local_addr;
238 *rsin6 = (struct sockaddr_in6 *)&id->remote_addr;
239 } else {
240 *lsin6 = &zero_sin6;
241 *rsin6 = &zero_sin6;
242 }
243 }
244
245 static int dump_qp(unsigned long id, struct c4iw_qp *qp,
246 struct c4iw_debugfs_data *qpd)
247 {
248 int space;
249 int cc;
250 if (id != qp->wq.sq.qid)
251 return 0;
252
253 space = qpd->bufsize - qpd->pos - 1;
254 if (space == 0)
255 return 1;
256
257 if (qp->ep) {
258 struct c4iw_ep *ep = qp->ep;
259
260 if (ep->com.local_addr.ss_family == AF_INET) {
261 struct sockaddr_in *lsin;
262 struct sockaddr_in *rsin;
263 struct sockaddr_in *m_lsin;
264 struct sockaddr_in *m_rsin;
265
266 set_ep_sin_addrs(ep, &lsin, &rsin, &m_lsin, &m_rsin);
267 cc = snprintf(qpd->buf + qpd->pos, space,
268 "rc qp sq id %u %s id %u state %u "
269 "onchip %u ep tid %u state %u "
270 "%pI4:%u/%u->%pI4:%u/%u\n",
271 qp->wq.sq.qid, qp->srq ? "srq" : "rq",
272 qp->srq ? qp->srq->idx : qp->wq.rq.qid,
273 (int)qp->attr.state,
274 qp->wq.sq.flags & T4_SQ_ONCHIP,
275 ep->hwtid, (int)ep->com.state,
276 &lsin->sin_addr, ntohs(lsin->sin_port),
277 ntohs(m_lsin->sin_port),
278 &rsin->sin_addr, ntohs(rsin->sin_port),
279 ntohs(m_rsin->sin_port));
280 } else {
281 struct sockaddr_in6 *lsin6;
282 struct sockaddr_in6 *rsin6;
283 struct sockaddr_in6 *m_lsin6;
284 struct sockaddr_in6 *m_rsin6;
285
286 set_ep_sin6_addrs(ep, &lsin6, &rsin6, &m_lsin6,
287 &m_rsin6);
288 cc = snprintf(qpd->buf + qpd->pos, space,
289 "rc qp sq id %u rq id %u state %u "
290 "onchip %u ep tid %u state %u "
291 "%pI6:%u/%u->%pI6:%u/%u\n",
292 qp->wq.sq.qid, qp->wq.rq.qid,
293 (int)qp->attr.state,
294 qp->wq.sq.flags & T4_SQ_ONCHIP,
295 ep->hwtid, (int)ep->com.state,
296 &lsin6->sin6_addr,
297 ntohs(lsin6->sin6_port),
298 ntohs(m_lsin6->sin6_port),
299 &rsin6->sin6_addr,
300 ntohs(rsin6->sin6_port),
301 ntohs(m_rsin6->sin6_port));
302 }
303 } else
304 cc = snprintf(qpd->buf + qpd->pos, space,
305 "qp sq id %u rq id %u state %u onchip %u\n",
306 qp->wq.sq.qid, qp->wq.rq.qid,
307 (int)qp->attr.state,
308 qp->wq.sq.flags & T4_SQ_ONCHIP);
309 if (cc < space)
310 qpd->pos += cc;
311 return 0;
312 }
313
314 static int qp_release(struct inode *inode, struct file *file)
315 {
316 struct c4iw_debugfs_data *qpd = file->private_data;
317 if (!qpd) {
318 pr_info("%s null qpd?\n", __func__);
319 return 0;
320 }
321 vfree(qpd->buf);
322 kfree(qpd);
323 return 0;
324 }
325
326 static int qp_open(struct inode *inode, struct file *file)
327 {
328 struct c4iw_qp *qp;
329 struct c4iw_debugfs_data *qpd;
330 unsigned long index;
331 int count = 1;
332
333 qpd = kmalloc(sizeof(*qpd), GFP_KERNEL);
334 if (!qpd)
335 return -ENOMEM;
336
337 qpd->devp = inode->i_private;
338 qpd->pos = 0;
339
340 /*
341 * No need to lock; we drop the lock to call vmalloc so it's racy
342 * anyway. Someone who cares should switch this over to seq_file
343 */
344 xa_for_each(&qpd->devp->qps, index, qp)
345 count++;
346
347 qpd->bufsize = count * 180;
348 qpd->buf = vmalloc(qpd->bufsize);
349 if (!qpd->buf) {
350 kfree(qpd);
351 return -ENOMEM;
352 }
353
354 xa_lock_irq(&qpd->devp->qps);
355 xa_for_each(&qpd->devp->qps, index, qp)
356 dump_qp(index, qp, qpd);
357 xa_unlock_irq(&qpd->devp->qps);
358
359 qpd->buf[qpd->pos++] = 0;
360 file->private_data = qpd;
361 return 0;
362 }
363
364 static const struct file_operations qp_debugfs_fops = {
365 .owner = THIS_MODULE,
366 .open = qp_open,
367 .release = qp_release,
368 .read = debugfs_read,
369 .llseek = default_llseek,
370 };
371
372 static int dump_stag(unsigned long id, struct c4iw_debugfs_data *stagd)
373 {
374 int space;
375 int cc;
376 struct fw_ri_tpte tpte;
377 int ret;
378
379 space = stagd->bufsize - stagd->pos - 1;
380 if (space == 0)
381 return 1;
382
383 ret = cxgb4_read_tpte(stagd->devp->rdev.lldi.ports[0], (u32)id<<8,
384 (__be32 *)&tpte);
385 if (ret) {
386 dev_err(&stagd->devp->rdev.lldi.pdev->dev,
387 "%s cxgb4_read_tpte err %d\n", __func__, ret);
388 return ret;
389 }
390 cc = snprintf(stagd->buf + stagd->pos, space,
391 "stag: idx 0x%x valid %d key 0x%x state %d pdid %d "
392 "perm 0x%x ps %d len 0x%llx va 0x%llx\n",
393 (u32)id<<8,
394 FW_RI_TPTE_VALID_G(ntohl(tpte.valid_to_pdid)),
395 FW_RI_TPTE_STAGKEY_G(ntohl(tpte.valid_to_pdid)),
396 FW_RI_TPTE_STAGSTATE_G(ntohl(tpte.valid_to_pdid)),
397 FW_RI_TPTE_PDID_G(ntohl(tpte.valid_to_pdid)),
398 FW_RI_TPTE_PERM_G(ntohl(tpte.locread_to_qpid)),
399 FW_RI_TPTE_PS_G(ntohl(tpte.locread_to_qpid)),
400 ((u64)ntohl(tpte.len_hi) << 32) | ntohl(tpte.len_lo),
401 ((u64)ntohl(tpte.va_hi) << 32) | ntohl(tpte.va_lo_fbo));
402 if (cc < space)
403 stagd->pos += cc;
404 return 0;
405 }
406
407 static int stag_release(struct inode *inode, struct file *file)
408 {
409 struct c4iw_debugfs_data *stagd = file->private_data;
410 if (!stagd) {
411 pr_info("%s null stagd?\n", __func__);
412 return 0;
413 }
414 vfree(stagd->buf);
415 kfree(stagd);
416 return 0;
417 }
418
419 static int stag_open(struct inode *inode, struct file *file)
420 {
421 struct c4iw_debugfs_data *stagd;
422 void *p;
423 unsigned long index;
424 int ret = 0;
425 int count = 1;
426
427 stagd = kmalloc(sizeof(*stagd), GFP_KERNEL);
428 if (!stagd) {
429 ret = -ENOMEM;
430 goto out;
431 }
432 stagd->devp = inode->i_private;
433 stagd->pos = 0;
434
435 xa_for_each(&stagd->devp->mrs, index, p)
436 count++;
437
438 stagd->bufsize = count * 256;
439 stagd->buf = vmalloc(stagd->bufsize);
440 if (!stagd->buf) {
441 ret = -ENOMEM;
442 goto err1;
443 }
444
445 xa_lock_irq(&stagd->devp->mrs);
446 xa_for_each(&stagd->devp->mrs, index, p)
447 dump_stag(index, stagd);
448 xa_unlock_irq(&stagd->devp->mrs);
449
450 stagd->buf[stagd->pos++] = 0;
451 file->private_data = stagd;
452 goto out;
453 err1:
454 kfree(stagd);
455 out:
456 return ret;
457 }
458
459 static const struct file_operations stag_debugfs_fops = {
460 .owner = THIS_MODULE,
461 .open = stag_open,
462 .release = stag_release,
463 .read = debugfs_read,
464 .llseek = default_llseek,
465 };
466
467 static char *db_state_str[] = {"NORMAL", "FLOW_CONTROL", "RECOVERY", "STOPPED"};
468
469 static int stats_show(struct seq_file *seq, void *v)
470 {
471 struct c4iw_dev *dev = seq->private;
472
473 seq_printf(seq, " Object: %10s %10s %10s %10s\n", "Total", "Current",
474 "Max", "Fail");
475 seq_printf(seq, " PDID: %10llu %10llu %10llu %10llu\n",
476 dev->rdev.stats.pd.total, dev->rdev.stats.pd.cur,
477 dev->rdev.stats.pd.max, dev->rdev.stats.pd.fail);
478 seq_printf(seq, " QID: %10llu %10llu %10llu %10llu\n",
479 dev->rdev.stats.qid.total, dev->rdev.stats.qid.cur,
480 dev->rdev.stats.qid.max, dev->rdev.stats.qid.fail);
481 seq_printf(seq, " SRQS: %10llu %10llu %10llu %10llu\n",
482 dev->rdev.stats.srqt.total, dev->rdev.stats.srqt.cur,
483 dev->rdev.stats.srqt.max, dev->rdev.stats.srqt.fail);
484 seq_printf(seq, " TPTMEM: %10llu %10llu %10llu %10llu\n",
485 dev->rdev.stats.stag.total, dev->rdev.stats.stag.cur,
486 dev->rdev.stats.stag.max, dev->rdev.stats.stag.fail);
487 seq_printf(seq, " PBLMEM: %10llu %10llu %10llu %10llu\n",
488 dev->rdev.stats.pbl.total, dev->rdev.stats.pbl.cur,
489 dev->rdev.stats.pbl.max, dev->rdev.stats.pbl.fail);
490 seq_printf(seq, " RQTMEM: %10llu %10llu %10llu %10llu\n",
491 dev->rdev.stats.rqt.total, dev->rdev.stats.rqt.cur,
492 dev->rdev.stats.rqt.max, dev->rdev.stats.rqt.fail);
493 seq_printf(seq, " OCQPMEM: %10llu %10llu %10llu %10llu\n",
494 dev->rdev.stats.ocqp.total, dev->rdev.stats.ocqp.cur,
495 dev->rdev.stats.ocqp.max, dev->rdev.stats.ocqp.fail);
496 seq_printf(seq, " DB FULL: %10llu\n", dev->rdev.stats.db_full);
497 seq_printf(seq, " DB EMPTY: %10llu\n", dev->rdev.stats.db_empty);
498 seq_printf(seq, " DB DROP: %10llu\n", dev->rdev.stats.db_drop);
499 seq_printf(seq, " DB State: %s Transitions %llu FC Interruptions %llu\n",
500 db_state_str[dev->db_state],
501 dev->rdev.stats.db_state_transitions,
502 dev->rdev.stats.db_fc_interruptions);
503 seq_printf(seq, "TCAM_FULL: %10llu\n", dev->rdev.stats.tcam_full);
504 seq_printf(seq, "ACT_OFLD_CONN_FAILS: %10llu\n",
505 dev->rdev.stats.act_ofld_conn_fails);
506 seq_printf(seq, "PAS_OFLD_CONN_FAILS: %10llu\n",
507 dev->rdev.stats.pas_ofld_conn_fails);
508 seq_printf(seq, "NEG_ADV_RCVD: %10llu\n", dev->rdev.stats.neg_adv);
509 seq_printf(seq, "AVAILABLE IRD: %10u\n", dev->avail_ird);
510 return 0;
511 }
512
513 static int stats_open(struct inode *inode, struct file *file)
514 {
515 return single_open(file, stats_show, inode->i_private);
516 }
517
518 static ssize_t stats_clear(struct file *file, const char __user *buf,
519 size_t count, loff_t *pos)
520 {
521 struct c4iw_dev *dev = ((struct seq_file *)file->private_data)->private;
522
523 mutex_lock(&dev->rdev.stats.lock);
524 dev->rdev.stats.pd.max = 0;
525 dev->rdev.stats.pd.fail = 0;
526 dev->rdev.stats.qid.max = 0;
527 dev->rdev.stats.qid.fail = 0;
528 dev->rdev.stats.stag.max = 0;
529 dev->rdev.stats.stag.fail = 0;
530 dev->rdev.stats.pbl.max = 0;
531 dev->rdev.stats.pbl.fail = 0;
532 dev->rdev.stats.rqt.max = 0;
533 dev->rdev.stats.rqt.fail = 0;
534 dev->rdev.stats.rqt.max = 0;
535 dev->rdev.stats.rqt.fail = 0;
536 dev->rdev.stats.ocqp.max = 0;
537 dev->rdev.stats.ocqp.fail = 0;
538 dev->rdev.stats.db_full = 0;
539 dev->rdev.stats.db_empty = 0;
540 dev->rdev.stats.db_drop = 0;
541 dev->rdev.stats.db_state_transitions = 0;
542 dev->rdev.stats.tcam_full = 0;
543 dev->rdev.stats.act_ofld_conn_fails = 0;
544 dev->rdev.stats.pas_ofld_conn_fails = 0;
545 mutex_unlock(&dev->rdev.stats.lock);
546 return count;
547 }
548
549 static const struct file_operations stats_debugfs_fops = {
550 .owner = THIS_MODULE,
551 .open = stats_open,
552 .release = single_release,
553 .read = seq_read,
554 .llseek = seq_lseek,
555 .write = stats_clear,
556 };
557
558 static int dump_ep(struct c4iw_ep *ep, struct c4iw_debugfs_data *epd)
559 {
560 int space;
561 int cc;
562
563 space = epd->bufsize - epd->pos - 1;
564 if (space == 0)
565 return 1;
566
567 if (ep->com.local_addr.ss_family == AF_INET) {
568 struct sockaddr_in *lsin;
569 struct sockaddr_in *rsin;
570 struct sockaddr_in *m_lsin;
571 struct sockaddr_in *m_rsin;
572
573 set_ep_sin_addrs(ep, &lsin, &rsin, &m_lsin, &m_rsin);
574 cc = snprintf(epd->buf + epd->pos, space,
575 "ep %p cm_id %p qp %p state %d flags 0x%lx "
576 "history 0x%lx hwtid %d atid %d "
577 "conn_na %u abort_na %u "
578 "%pI4:%d/%d <-> %pI4:%d/%d\n",
579 ep, ep->com.cm_id, ep->com.qp,
580 (int)ep->com.state, ep->com.flags,
581 ep->com.history, ep->hwtid, ep->atid,
582 ep->stats.connect_neg_adv,
583 ep->stats.abort_neg_adv,
584 &lsin->sin_addr, ntohs(lsin->sin_port),
585 ntohs(m_lsin->sin_port),
586 &rsin->sin_addr, ntohs(rsin->sin_port),
587 ntohs(m_rsin->sin_port));
588 } else {
589 struct sockaddr_in6 *lsin6;
590 struct sockaddr_in6 *rsin6;
591 struct sockaddr_in6 *m_lsin6;
592 struct sockaddr_in6 *m_rsin6;
593
594 set_ep_sin6_addrs(ep, &lsin6, &rsin6, &m_lsin6, &m_rsin6);
595 cc = snprintf(epd->buf + epd->pos, space,
596 "ep %p cm_id %p qp %p state %d flags 0x%lx "
597 "history 0x%lx hwtid %d atid %d "
598 "conn_na %u abort_na %u "
599 "%pI6:%d/%d <-> %pI6:%d/%d\n",
600 ep, ep->com.cm_id, ep->com.qp,
601 (int)ep->com.state, ep->com.flags,
602 ep->com.history, ep->hwtid, ep->atid,
603 ep->stats.connect_neg_adv,
604 ep->stats.abort_neg_adv,
605 &lsin6->sin6_addr, ntohs(lsin6->sin6_port),
606 ntohs(m_lsin6->sin6_port),
607 &rsin6->sin6_addr, ntohs(rsin6->sin6_port),
608 ntohs(m_rsin6->sin6_port));
609 }
610 if (cc < space)
611 epd->pos += cc;
612 return 0;
613 }
614
615 static
616 int dump_listen_ep(struct c4iw_listen_ep *ep, struct c4iw_debugfs_data *epd)
617 {
618 int space;
619 int cc;
620
621 space = epd->bufsize - epd->pos - 1;
622 if (space == 0)
623 return 1;
624
625 if (ep->com.local_addr.ss_family == AF_INET) {
626 struct sockaddr_in *lsin = (struct sockaddr_in *)
627 &ep->com.cm_id->local_addr;
628 struct sockaddr_in *m_lsin = (struct sockaddr_in *)
629 &ep->com.cm_id->m_local_addr;
630
631 cc = snprintf(epd->buf + epd->pos, space,
632 "ep %p cm_id %p state %d flags 0x%lx stid %d "
633 "backlog %d %pI4:%d/%d\n",
634 ep, ep->com.cm_id, (int)ep->com.state,
635 ep->com.flags, ep->stid, ep->backlog,
636 &lsin->sin_addr, ntohs(lsin->sin_port),
637 ntohs(m_lsin->sin_port));
638 } else {
639 struct sockaddr_in6 *lsin6 = (struct sockaddr_in6 *)
640 &ep->com.cm_id->local_addr;
641 struct sockaddr_in6 *m_lsin6 = (struct sockaddr_in6 *)
642 &ep->com.cm_id->m_local_addr;
643
644 cc = snprintf(epd->buf + epd->pos, space,
645 "ep %p cm_id %p state %d flags 0x%lx stid %d "
646 "backlog %d %pI6:%d/%d\n",
647 ep, ep->com.cm_id, (int)ep->com.state,
648 ep->com.flags, ep->stid, ep->backlog,
649 &lsin6->sin6_addr, ntohs(lsin6->sin6_port),
650 ntohs(m_lsin6->sin6_port));
651 }
652 if (cc < space)
653 epd->pos += cc;
654 return 0;
655 }
656
657 static int ep_release(struct inode *inode, struct file *file)
658 {
659 struct c4iw_debugfs_data *epd = file->private_data;
660 if (!epd) {
661 pr_info("%s null qpd?\n", __func__);
662 return 0;
663 }
664 vfree(epd->buf);
665 kfree(epd);
666 return 0;
667 }
668
669 static int ep_open(struct inode *inode, struct file *file)
670 {
671 struct c4iw_ep *ep;
672 struct c4iw_listen_ep *lep;
673 unsigned long index;
674 struct c4iw_debugfs_data *epd;
675 int ret = 0;
676 int count = 1;
677
678 epd = kmalloc(sizeof(*epd), GFP_KERNEL);
679 if (!epd) {
680 ret = -ENOMEM;
681 goto out;
682 }
683 epd->devp = inode->i_private;
684 epd->pos = 0;
685
686 xa_for_each(&epd->devp->hwtids, index, ep)
687 count++;
688 xa_for_each(&epd->devp->atids, index, ep)
689 count++;
690 xa_for_each(&epd->devp->stids, index, lep)
691 count++;
692
693 epd->bufsize = count * 240;
694 epd->buf = vmalloc(epd->bufsize);
695 if (!epd->buf) {
696 ret = -ENOMEM;
697 goto err1;
698 }
699
700 xa_lock_irq(&epd->devp->hwtids);
701 xa_for_each(&epd->devp->hwtids, index, ep)
702 dump_ep(ep, epd);
703 xa_unlock_irq(&epd->devp->hwtids);
704 xa_lock_irq(&epd->devp->atids);
705 xa_for_each(&epd->devp->atids, index, ep)
706 dump_ep(ep, epd);
707 xa_unlock_irq(&epd->devp->atids);
708 xa_lock_irq(&epd->devp->stids);
709 xa_for_each(&epd->devp->stids, index, lep)
710 dump_listen_ep(lep, epd);
711 xa_unlock_irq(&epd->devp->stids);
712
713 file->private_data = epd;
714 goto out;
715 err1:
716 kfree(epd);
717 out:
718 return ret;
719 }
720
721 static const struct file_operations ep_debugfs_fops = {
722 .owner = THIS_MODULE,
723 .open = ep_open,
724 .release = ep_release,
725 .read = debugfs_read,
726 };
727
728 static void setup_debugfs(struct c4iw_dev *devp)
729 {
730 debugfs_create_file_size("qps", S_IWUSR, devp->debugfs_root,
731 (void *)devp, &qp_debugfs_fops, 4096);
732
733 debugfs_create_file_size("stags", S_IWUSR, devp->debugfs_root,
734 (void *)devp, &stag_debugfs_fops, 4096);
735
736 debugfs_create_file_size("stats", S_IWUSR, devp->debugfs_root,
737 (void *)devp, &stats_debugfs_fops, 4096);
738
739 debugfs_create_file_size("eps", S_IWUSR, devp->debugfs_root,
740 (void *)devp, &ep_debugfs_fops, 4096);
741
742 if (c4iw_wr_log)
743 debugfs_create_file_size("wr_log", S_IWUSR, devp->debugfs_root,
744 (void *)devp, &wr_log_debugfs_fops, 4096);
745 }
746
747 void c4iw_release_dev_ucontext(struct c4iw_rdev *rdev,
748 struct c4iw_dev_ucontext *uctx)
749 {
750 struct list_head *pos, *nxt;
751 struct c4iw_qid_list *entry;
752
753 mutex_lock(&uctx->lock);
754 list_for_each_safe(pos, nxt, &uctx->qpids) {
755 entry = list_entry(pos, struct c4iw_qid_list, entry);
756 list_del_init(&entry->entry);
757 if (!(entry->qid & rdev->qpmask)) {
758 c4iw_put_resource(&rdev->resource.qid_table,
759 entry->qid);
760 mutex_lock(&rdev->stats.lock);
761 rdev->stats.qid.cur -= rdev->qpmask + 1;
762 mutex_unlock(&rdev->stats.lock);
763 }
764 kfree(entry);
765 }
766
767 list_for_each_safe(pos, nxt, &uctx->cqids) {
768 entry = list_entry(pos, struct c4iw_qid_list, entry);
769 list_del_init(&entry->entry);
770 kfree(entry);
771 }
772 mutex_unlock(&uctx->lock);
773 }
774
775 void c4iw_init_dev_ucontext(struct c4iw_rdev *rdev,
776 struct c4iw_dev_ucontext *uctx)
777 {
778 INIT_LIST_HEAD(&uctx->qpids);
779 INIT_LIST_HEAD(&uctx->cqids);
780 mutex_init(&uctx->lock);
781 }
782
783 /* Caller takes care of locking if needed */
784 static int c4iw_rdev_open(struct c4iw_rdev *rdev)
785 {
786 int err;
787 unsigned int factor;
788
789 c4iw_init_dev_ucontext(rdev, &rdev->uctx);
790
791 /*
792 * This implementation assumes udb_density == ucq_density! Eventually
793 * we might need to support this but for now fail the open. Also the
794 * cqid and qpid range must match for now.
795 */
796 if (rdev->lldi.udb_density != rdev->lldi.ucq_density) {
797 pr_err("%s: unsupported udb/ucq densities %u/%u\n",
798 pci_name(rdev->lldi.pdev), rdev->lldi.udb_density,
799 rdev->lldi.ucq_density);
800 return -EINVAL;
801 }
802 if (rdev->lldi.vr->qp.start != rdev->lldi.vr->cq.start ||
803 rdev->lldi.vr->qp.size != rdev->lldi.vr->cq.size) {
804 pr_err("%s: unsupported qp and cq id ranges qp start %u size %u cq start %u size %u\n",
805 pci_name(rdev->lldi.pdev), rdev->lldi.vr->qp.start,
806 rdev->lldi.vr->qp.size, rdev->lldi.vr->cq.size,
807 rdev->lldi.vr->cq.size);
808 return -EINVAL;
809 }
810
811 /* This implementation requires a sge_host_page_size <= PAGE_SIZE. */
812 if (rdev->lldi.sge_host_page_size > PAGE_SIZE) {
813 pr_err("%s: unsupported sge host page size %u\n",
814 pci_name(rdev->lldi.pdev),
815 rdev->lldi.sge_host_page_size);
816 return -EINVAL;
817 }
818
819 factor = PAGE_SIZE / rdev->lldi.sge_host_page_size;
820 rdev->qpmask = (rdev->lldi.udb_density * factor) - 1;
821 rdev->cqmask = (rdev->lldi.ucq_density * factor) - 1;
822
823 pr_debug("dev %s stag start 0x%0x size 0x%0x num stags %d pbl start 0x%0x size 0x%0x rq start 0x%0x size 0x%0x qp qid start %u size %u cq qid start %u size %u srq size %u\n",
824 pci_name(rdev->lldi.pdev), rdev->lldi.vr->stag.start,
825 rdev->lldi.vr->stag.size, c4iw_num_stags(rdev),
826 rdev->lldi.vr->pbl.start,
827 rdev->lldi.vr->pbl.size, rdev->lldi.vr->rq.start,
828 rdev->lldi.vr->rq.size,
829 rdev->lldi.vr->qp.start,
830 rdev->lldi.vr->qp.size,
831 rdev->lldi.vr->cq.start,
832 rdev->lldi.vr->cq.size,
833 rdev->lldi.vr->srq.size);
834 pr_debug("udb %pR db_reg %p gts_reg %p qpmask 0x%x cqmask 0x%x\n",
835 &rdev->lldi.pdev->resource[2],
836 rdev->lldi.db_reg, rdev->lldi.gts_reg,
837 rdev->qpmask, rdev->cqmask);
838
839 if (c4iw_num_stags(rdev) == 0)
840 return -EINVAL;
841
842 rdev->stats.pd.total = T4_MAX_NUM_PD;
843 rdev->stats.stag.total = rdev->lldi.vr->stag.size;
844 rdev->stats.pbl.total = rdev->lldi.vr->pbl.size;
845 rdev->stats.rqt.total = rdev->lldi.vr->rq.size;
846 rdev->stats.srqt.total = rdev->lldi.vr->srq.size;
847 rdev->stats.ocqp.total = rdev->lldi.vr->ocq.size;
848 rdev->stats.qid.total = rdev->lldi.vr->qp.size;
849
850 err = c4iw_init_resource(rdev, c4iw_num_stags(rdev),
851 T4_MAX_NUM_PD, rdev->lldi.vr->srq.size);
852 if (err) {
853 pr_err("error %d initializing resources\n", err);
854 return err;
855 }
856 err = c4iw_pblpool_create(rdev);
857 if (err) {
858 pr_err("error %d initializing pbl pool\n", err);
859 goto destroy_resource;
860 }
861 err = c4iw_rqtpool_create(rdev);
862 if (err) {
863 pr_err("error %d initializing rqt pool\n", err);
864 goto destroy_pblpool;
865 }
866 err = c4iw_ocqp_pool_create(rdev);
867 if (err) {
868 pr_err("error %d initializing ocqp pool\n", err);
869 goto destroy_rqtpool;
870 }
871 rdev->status_page = (struct t4_dev_status_page *)
872 __get_free_page(GFP_KERNEL);
873 if (!rdev->status_page) {
874 err = -ENOMEM;
875 goto destroy_ocqp_pool;
876 }
877 rdev->status_page->qp_start = rdev->lldi.vr->qp.start;
878 rdev->status_page->qp_size = rdev->lldi.vr->qp.size;
879 rdev->status_page->cq_start = rdev->lldi.vr->cq.start;
880 rdev->status_page->cq_size = rdev->lldi.vr->cq.size;
881 rdev->status_page->write_cmpl_supported = rdev->lldi.write_cmpl_support;
882
883 if (c4iw_wr_log) {
884 rdev->wr_log = kcalloc(1 << c4iw_wr_log_size_order,
885 sizeof(*rdev->wr_log),
886 GFP_KERNEL);
887 if (rdev->wr_log) {
888 rdev->wr_log_size = 1 << c4iw_wr_log_size_order;
889 atomic_set(&rdev->wr_log_idx, 0);
890 }
891 }
892
893 rdev->free_workq = create_singlethread_workqueue("iw_cxgb4_free");
894 if (!rdev->free_workq) {
895 err = -ENOMEM;
896 goto err_free_status_page_and_wr_log;
897 }
898
899 rdev->status_page->db_off = 0;
900
901 init_completion(&rdev->rqt_compl);
902 init_completion(&rdev->pbl_compl);
903 kref_init(&rdev->rqt_kref);
904 kref_init(&rdev->pbl_kref);
905
906 return 0;
907 err_free_status_page_and_wr_log:
908 if (c4iw_wr_log && rdev->wr_log)
909 kfree(rdev->wr_log);
910 free_page((unsigned long)rdev->status_page);
911 destroy_ocqp_pool:
912 c4iw_ocqp_pool_destroy(rdev);
913 destroy_rqtpool:
914 c4iw_rqtpool_destroy(rdev);
915 destroy_pblpool:
916 c4iw_pblpool_destroy(rdev);
917 destroy_resource:
918 c4iw_destroy_resource(&rdev->resource);
919 return err;
920 }
921
922 static void c4iw_rdev_close(struct c4iw_rdev *rdev)
923 {
924 kfree(rdev->wr_log);
925 c4iw_release_dev_ucontext(rdev, &rdev->uctx);
926 free_page((unsigned long)rdev->status_page);
927 c4iw_pblpool_destroy(rdev);
928 c4iw_rqtpool_destroy(rdev);
929 wait_for_completion(&rdev->pbl_compl);
930 wait_for_completion(&rdev->rqt_compl);
931 c4iw_ocqp_pool_destroy(rdev);
932 destroy_workqueue(rdev->free_workq);
933 c4iw_destroy_resource(&rdev->resource);
934 }
935
936 void c4iw_dealloc(struct uld_ctx *ctx)
937 {
938 c4iw_rdev_close(&ctx->dev->rdev);
939 WARN_ON(!xa_empty(&ctx->dev->cqs));
940 WARN_ON(!xa_empty(&ctx->dev->qps));
941 WARN_ON(!xa_empty(&ctx->dev->mrs));
942 wait_event(ctx->dev->wait, xa_empty(&ctx->dev->hwtids));
943 WARN_ON(!xa_empty(&ctx->dev->stids));
944 WARN_ON(!xa_empty(&ctx->dev->atids));
945 if (ctx->dev->rdev.bar2_kva)
946 iounmap(ctx->dev->rdev.bar2_kva);
947 if (ctx->dev->rdev.oc_mw_kva)
948 iounmap(ctx->dev->rdev.oc_mw_kva);
949 ib_dealloc_device(&ctx->dev->ibdev);
950 ctx->dev = NULL;
951 }
952
953 static void c4iw_remove(struct uld_ctx *ctx)
954 {
955 pr_debug("c4iw_dev %p\n", ctx->dev);
956 c4iw_unregister_device(ctx->dev);
957 c4iw_dealloc(ctx);
958 }
959
960 static int rdma_supported(const struct cxgb4_lld_info *infop)
961 {
962 return infop->vr->stag.size > 0 && infop->vr->pbl.size > 0 &&
963 infop->vr->rq.size > 0 && infop->vr->qp.size > 0 &&
964 infop->vr->cq.size > 0;
965 }
966
967 static struct c4iw_dev *c4iw_alloc(const struct cxgb4_lld_info *infop)
968 {
969 struct c4iw_dev *devp;
970 int ret;
971
972 if (!rdma_supported(infop)) {
973 pr_info("%s: RDMA not supported on this device\n",
974 pci_name(infop->pdev));
975 return ERR_PTR(-ENOSYS);
976 }
977 if (!ocqp_supported(infop))
978 pr_info("%s: On-Chip Queues not supported on this device\n",
979 pci_name(infop->pdev));
980
981 devp = ib_alloc_device(c4iw_dev, ibdev);
982 if (!devp) {
983 pr_err("Cannot allocate ib device\n");
984 return ERR_PTR(-ENOMEM);
985 }
986 devp->rdev.lldi = *infop;
987
988 /* init various hw-queue params based on lld info */
989 pr_debug("Ing. padding boundary is %d, egrsstatuspagesize = %d\n",
990 devp->rdev.lldi.sge_ingpadboundary,
991 devp->rdev.lldi.sge_egrstatuspagesize);
992
993 devp->rdev.hw_queue.t4_eq_status_entries =
994 devp->rdev.lldi.sge_egrstatuspagesize / 64;
995 devp->rdev.hw_queue.t4_max_eq_size = 65520;
996 devp->rdev.hw_queue.t4_max_iq_size = 65520;
997 devp->rdev.hw_queue.t4_max_rq_size = 8192 -
998 devp->rdev.hw_queue.t4_eq_status_entries - 1;
999 devp->rdev.hw_queue.t4_max_sq_size =
1000 devp->rdev.hw_queue.t4_max_eq_size -
1001 devp->rdev.hw_queue.t4_eq_status_entries - 1;
1002 devp->rdev.hw_queue.t4_max_qp_depth =
1003 devp->rdev.hw_queue.t4_max_rq_size;
1004 devp->rdev.hw_queue.t4_max_cq_depth =
1005 devp->rdev.hw_queue.t4_max_iq_size - 2;
1006 devp->rdev.hw_queue.t4_stat_len =
1007 devp->rdev.lldi.sge_egrstatuspagesize;
1008
1009 /*
1010 * For T5/T6 devices, we map all of BAR2 with WC.
1011 * For T4 devices with onchip qp mem, we map only that part
1012 * of BAR2 with WC.
1013 */
1014 devp->rdev.bar2_pa = pci_resource_start(devp->rdev.lldi.pdev, 2);
1015 if (!is_t4(devp->rdev.lldi.adapter_type)) {
1016 devp->rdev.bar2_kva = ioremap_wc(devp->rdev.bar2_pa,
1017 pci_resource_len(devp->rdev.lldi.pdev, 2));
1018 if (!devp->rdev.bar2_kva) {
1019 pr_err("Unable to ioremap BAR2\n");
1020 ib_dealloc_device(&devp->ibdev);
1021 return ERR_PTR(-EINVAL);
1022 }
1023 } else if (ocqp_supported(infop)) {
1024 devp->rdev.oc_mw_pa =
1025 pci_resource_start(devp->rdev.lldi.pdev, 2) +
1026 pci_resource_len(devp->rdev.lldi.pdev, 2) -
1027 roundup_pow_of_two(devp->rdev.lldi.vr->ocq.size);
1028 devp->rdev.oc_mw_kva = ioremap_wc(devp->rdev.oc_mw_pa,
1029 devp->rdev.lldi.vr->ocq.size);
1030 if (!devp->rdev.oc_mw_kva) {
1031 pr_err("Unable to ioremap onchip mem\n");
1032 ib_dealloc_device(&devp->ibdev);
1033 return ERR_PTR(-EINVAL);
1034 }
1035 }
1036
1037 pr_debug("ocq memory: hw_start 0x%x size %u mw_pa 0x%lx mw_kva %p\n",
1038 devp->rdev.lldi.vr->ocq.start, devp->rdev.lldi.vr->ocq.size,
1039 devp->rdev.oc_mw_pa, devp->rdev.oc_mw_kva);
1040
1041 ret = c4iw_rdev_open(&devp->rdev);
1042 if (ret) {
1043 pr_err("Unable to open CXIO rdev err %d\n", ret);
1044 ib_dealloc_device(&devp->ibdev);
1045 return ERR_PTR(ret);
1046 }
1047
1048 xa_init_flags(&devp->cqs, XA_FLAGS_LOCK_IRQ);
1049 xa_init_flags(&devp->qps, XA_FLAGS_LOCK_IRQ);
1050 xa_init_flags(&devp->mrs, XA_FLAGS_LOCK_IRQ);
1051 xa_init_flags(&devp->hwtids, XA_FLAGS_LOCK_IRQ);
1052 xa_init_flags(&devp->atids, XA_FLAGS_LOCK_IRQ);
1053 xa_init_flags(&devp->stids, XA_FLAGS_LOCK_IRQ);
1054 mutex_init(&devp->rdev.stats.lock);
1055 mutex_init(&devp->db_mutex);
1056 INIT_LIST_HEAD(&devp->db_fc_list);
1057 init_waitqueue_head(&devp->wait);
1058 devp->avail_ird = devp->rdev.lldi.max_ird_adapter;
1059
1060 if (c4iw_debugfs_root) {
1061 devp->debugfs_root = debugfs_create_dir(
1062 pci_name(devp->rdev.lldi.pdev),
1063 c4iw_debugfs_root);
1064 setup_debugfs(devp);
1065 }
1066
1067
1068 return devp;
1069 }
1070
1071 static void *c4iw_uld_add(const struct cxgb4_lld_info *infop)
1072 {
1073 struct uld_ctx *ctx;
1074 static int vers_printed;
1075 int i;
1076
1077 if (!vers_printed++)
1078 pr_info("Chelsio T4/T5 RDMA Driver - version %s\n",
1079 DRV_VERSION);
1080
1081 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
1082 if (!ctx) {
1083 ctx = ERR_PTR(-ENOMEM);
1084 goto out;
1085 }
1086 ctx->lldi = *infop;
1087
1088 pr_debug("found device %s nchan %u nrxq %u ntxq %u nports %u\n",
1089 pci_name(ctx->lldi.pdev),
1090 ctx->lldi.nchan, ctx->lldi.nrxq,
1091 ctx->lldi.ntxq, ctx->lldi.nports);
1092
1093 mutex_lock(&dev_mutex);
1094 list_add_tail(&ctx->entry, &uld_ctx_list);
1095 mutex_unlock(&dev_mutex);
1096
1097 for (i = 0; i < ctx->lldi.nrxq; i++)
1098 pr_debug("rxqid[%u] %u\n", i, ctx->lldi.rxq_ids[i]);
1099 out:
1100 return ctx;
1101 }
1102
1103 static inline struct sk_buff *copy_gl_to_skb_pkt(const struct pkt_gl *gl,
1104 const __be64 *rsp,
1105 u32 pktshift)
1106 {
1107 struct sk_buff *skb;
1108
1109 /*
1110 * Allocate space for cpl_pass_accept_req which will be synthesized by
1111 * driver. Once the driver synthesizes the request the skb will go
1112 * through the regular cpl_pass_accept_req processing.
1113 * The math here assumes sizeof cpl_pass_accept_req >= sizeof
1114 * cpl_rx_pkt.
1115 */
1116 skb = alloc_skb(gl->tot_len + sizeof(struct cpl_pass_accept_req) +
1117 sizeof(struct rss_header) - pktshift, GFP_ATOMIC);
1118 if (unlikely(!skb))
1119 return NULL;
1120
1121 __skb_put(skb, gl->tot_len + sizeof(struct cpl_pass_accept_req) +
1122 sizeof(struct rss_header) - pktshift);
1123
1124 /*
1125 * This skb will contain:
1126 * rss_header from the rspq descriptor (1 flit)
1127 * cpl_rx_pkt struct from the rspq descriptor (2 flits)
1128 * space for the difference between the size of an
1129 * rx_pkt and pass_accept_req cpl (1 flit)
1130 * the packet data from the gl
1131 */
1132 skb_copy_to_linear_data(skb, rsp, sizeof(struct cpl_pass_accept_req) +
1133 sizeof(struct rss_header));
1134 skb_copy_to_linear_data_offset(skb, sizeof(struct rss_header) +
1135 sizeof(struct cpl_pass_accept_req),
1136 gl->va + pktshift,
1137 gl->tot_len - pktshift);
1138 return skb;
1139 }
1140
1141 static inline int recv_rx_pkt(struct c4iw_dev *dev, const struct pkt_gl *gl,
1142 const __be64 *rsp)
1143 {
1144 unsigned int opcode = *(u8 *)rsp;
1145 struct sk_buff *skb;
1146
1147 if (opcode != CPL_RX_PKT)
1148 goto out;
1149
1150 skb = copy_gl_to_skb_pkt(gl , rsp, dev->rdev.lldi.sge_pktshift);
1151 if (skb == NULL)
1152 goto out;
1153
1154 if (c4iw_handlers[opcode] == NULL) {
1155 pr_info("%s no handler opcode 0x%x...\n", __func__, opcode);
1156 kfree_skb(skb);
1157 goto out;
1158 }
1159 c4iw_handlers[opcode](dev, skb);
1160 return 1;
1161 out:
1162 return 0;
1163 }
1164
1165 static int c4iw_uld_rx_handler(void *handle, const __be64 *rsp,
1166 const struct pkt_gl *gl)
1167 {
1168 struct uld_ctx *ctx = handle;
1169 struct c4iw_dev *dev = ctx->dev;
1170 struct sk_buff *skb;
1171 u8 opcode;
1172
1173 if (gl == NULL) {
1174 /* omit RSS and rsp_ctrl at end of descriptor */
1175 unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;
1176
1177 skb = alloc_skb(256, GFP_ATOMIC);
1178 if (!skb)
1179 goto nomem;
1180 __skb_put(skb, len);
1181 skb_copy_to_linear_data(skb, &rsp[1], len);
1182 } else if (gl == CXGB4_MSG_AN) {
1183 const struct rsp_ctrl *rc = (void *)rsp;
1184
1185 u32 qid = be32_to_cpu(rc->pldbuflen_qid);
1186 c4iw_ev_handler(dev, qid);
1187 return 0;
1188 } else if (unlikely(*(u8 *)rsp != *(u8 *)gl->va)) {
1189 if (recv_rx_pkt(dev, gl, rsp))
1190 return 0;
1191
1192 pr_info("%s: unexpected FL contents at %p, RSS %#llx, FL %#llx, len %u\n",
1193 pci_name(ctx->lldi.pdev), gl->va,
1194 be64_to_cpu(*rsp),
1195 be64_to_cpu(*(__force __be64 *)gl->va),
1196 gl->tot_len);
1197
1198 return 0;
1199 } else {
1200 skb = cxgb4_pktgl_to_skb(gl, 128, 128);
1201 if (unlikely(!skb))
1202 goto nomem;
1203 }
1204
1205 opcode = *(u8 *)rsp;
1206 if (c4iw_handlers[opcode]) {
1207 c4iw_handlers[opcode](dev, skb);
1208 } else {
1209 pr_info("%s no handler opcode 0x%x...\n", __func__, opcode);
1210 kfree_skb(skb);
1211 }
1212
1213 return 0;
1214 nomem:
1215 return -1;
1216 }
1217
1218 static int c4iw_uld_state_change(void *handle, enum cxgb4_state new_state)
1219 {
1220 struct uld_ctx *ctx = handle;
1221
1222 pr_debug("new_state %u\n", new_state);
1223 switch (new_state) {
1224 case CXGB4_STATE_UP:
1225 pr_info("%s: Up\n", pci_name(ctx->lldi.pdev));
1226 if (!ctx->dev) {
1227 ctx->dev = c4iw_alloc(&ctx->lldi);
1228 if (IS_ERR(ctx->dev)) {
1229 pr_err("%s: initialization failed: %ld\n",
1230 pci_name(ctx->lldi.pdev),
1231 PTR_ERR(ctx->dev));
1232 ctx->dev = NULL;
1233 break;
1234 }
1235
1236 INIT_WORK(&ctx->reg_work, c4iw_register_device);
1237 queue_work(reg_workq, &ctx->reg_work);
1238 }
1239 break;
1240 case CXGB4_STATE_DOWN:
1241 pr_info("%s: Down\n", pci_name(ctx->lldi.pdev));
1242 if (ctx->dev)
1243 c4iw_remove(ctx);
1244 break;
1245 case CXGB4_STATE_FATAL_ERROR:
1246 case CXGB4_STATE_START_RECOVERY:
1247 pr_info("%s: Fatal Error\n", pci_name(ctx->lldi.pdev));
1248 if (ctx->dev) {
1249 struct ib_event event = {};
1250
1251 ctx->dev->rdev.flags |= T4_FATAL_ERROR;
1252 event.event = IB_EVENT_DEVICE_FATAL;
1253 event.device = &ctx->dev->ibdev;
1254 ib_dispatch_event(&event);
1255 c4iw_remove(ctx);
1256 }
1257 break;
1258 case CXGB4_STATE_DETACH:
1259 pr_info("%s: Detach\n", pci_name(ctx->lldi.pdev));
1260 if (ctx->dev)
1261 c4iw_remove(ctx);
1262 break;
1263 }
1264 return 0;
1265 }
1266
1267 static void stop_queues(struct uld_ctx *ctx)
1268 {
1269 struct c4iw_qp *qp;
1270 unsigned long index, flags;
1271
1272 xa_lock_irqsave(&ctx->dev->qps, flags);
1273 ctx->dev->rdev.stats.db_state_transitions++;
1274 ctx->dev->db_state = STOPPED;
1275 if (ctx->dev->rdev.flags & T4_STATUS_PAGE_DISABLED) {
1276 xa_for_each(&ctx->dev->qps, index, qp)
1277 t4_disable_wq_db(&qp->wq);
1278 } else {
1279 ctx->dev->rdev.status_page->db_off = 1;
1280 }
1281 xa_unlock_irqrestore(&ctx->dev->qps, flags);
1282 }
1283
1284 static void resume_rc_qp(struct c4iw_qp *qp)
1285 {
1286 spin_lock(&qp->lock);
1287 t4_ring_sq_db(&qp->wq, qp->wq.sq.wq_pidx_inc, NULL);
1288 qp->wq.sq.wq_pidx_inc = 0;
1289 t4_ring_rq_db(&qp->wq, qp->wq.rq.wq_pidx_inc, NULL);
1290 qp->wq.rq.wq_pidx_inc = 0;
1291 spin_unlock(&qp->lock);
1292 }
1293
1294 static void resume_a_chunk(struct uld_ctx *ctx)
1295 {
1296 int i;
1297 struct c4iw_qp *qp;
1298
1299 for (i = 0; i < DB_FC_RESUME_SIZE; i++) {
1300 qp = list_first_entry(&ctx->dev->db_fc_list, struct c4iw_qp,
1301 db_fc_entry);
1302 list_del_init(&qp->db_fc_entry);
1303 resume_rc_qp(qp);
1304 if (list_empty(&ctx->dev->db_fc_list))
1305 break;
1306 }
1307 }
1308
1309 static void resume_queues(struct uld_ctx *ctx)
1310 {
1311 xa_lock_irq(&ctx->dev->qps);
1312 if (ctx->dev->db_state != STOPPED)
1313 goto out;
1314 ctx->dev->db_state = FLOW_CONTROL;
1315 while (1) {
1316 if (list_empty(&ctx->dev->db_fc_list)) {
1317 struct c4iw_qp *qp;
1318 unsigned long index;
1319
1320 WARN_ON(ctx->dev->db_state != FLOW_CONTROL);
1321 ctx->dev->db_state = NORMAL;
1322 ctx->dev->rdev.stats.db_state_transitions++;
1323 if (ctx->dev->rdev.flags & T4_STATUS_PAGE_DISABLED) {
1324 xa_for_each(&ctx->dev->qps, index, qp)
1325 t4_enable_wq_db(&qp->wq);
1326 } else {
1327 ctx->dev->rdev.status_page->db_off = 0;
1328 }
1329 break;
1330 } else {
1331 if (cxgb4_dbfifo_count(ctx->dev->rdev.lldi.ports[0], 1)
1332 < (ctx->dev->rdev.lldi.dbfifo_int_thresh <<
1333 DB_FC_DRAIN_THRESH)) {
1334 resume_a_chunk(ctx);
1335 }
1336 if (!list_empty(&ctx->dev->db_fc_list)) {
1337 xa_unlock_irq(&ctx->dev->qps);
1338 if (DB_FC_RESUME_DELAY) {
1339 set_current_state(TASK_UNINTERRUPTIBLE);
1340 schedule_timeout(DB_FC_RESUME_DELAY);
1341 }
1342 xa_lock_irq(&ctx->dev->qps);
1343 if (ctx->dev->db_state != FLOW_CONTROL)
1344 break;
1345 }
1346 }
1347 }
1348 out:
1349 if (ctx->dev->db_state != NORMAL)
1350 ctx->dev->rdev.stats.db_fc_interruptions++;
1351 xa_unlock_irq(&ctx->dev->qps);
1352 }
1353
1354 struct qp_list {
1355 unsigned idx;
1356 struct c4iw_qp **qps;
1357 };
1358
1359 static void deref_qps(struct qp_list *qp_list)
1360 {
1361 int idx;
1362
1363 for (idx = 0; idx < qp_list->idx; idx++)
1364 c4iw_qp_rem_ref(&qp_list->qps[idx]->ibqp);
1365 }
1366
1367 static void recover_lost_dbs(struct uld_ctx *ctx, struct qp_list *qp_list)
1368 {
1369 int idx;
1370 int ret;
1371
1372 for (idx = 0; idx < qp_list->idx; idx++) {
1373 struct c4iw_qp *qp = qp_list->qps[idx];
1374
1375 xa_lock_irq(&qp->rhp->qps);
1376 spin_lock(&qp->lock);
1377 ret = cxgb4_sync_txq_pidx(qp->rhp->rdev.lldi.ports[0],
1378 qp->wq.sq.qid,
1379 t4_sq_host_wq_pidx(&qp->wq),
1380 t4_sq_wq_size(&qp->wq));
1381 if (ret) {
1382 pr_err("%s: Fatal error - DB overflow recovery failed - error syncing SQ qid %u\n",
1383 pci_name(ctx->lldi.pdev), qp->wq.sq.qid);
1384 spin_unlock(&qp->lock);
1385 xa_unlock_irq(&qp->rhp->qps);
1386 return;
1387 }
1388 qp->wq.sq.wq_pidx_inc = 0;
1389
1390 ret = cxgb4_sync_txq_pidx(qp->rhp->rdev.lldi.ports[0],
1391 qp->wq.rq.qid,
1392 t4_rq_host_wq_pidx(&qp->wq),
1393 t4_rq_wq_size(&qp->wq));
1394
1395 if (ret) {
1396 pr_err("%s: Fatal error - DB overflow recovery failed - error syncing RQ qid %u\n",
1397 pci_name(ctx->lldi.pdev), qp->wq.rq.qid);
1398 spin_unlock(&qp->lock);
1399 xa_unlock_irq(&qp->rhp->qps);
1400 return;
1401 }
1402 qp->wq.rq.wq_pidx_inc = 0;
1403 spin_unlock(&qp->lock);
1404 xa_unlock_irq(&qp->rhp->qps);
1405
1406 /* Wait for the dbfifo to drain */
1407 while (cxgb4_dbfifo_count(qp->rhp->rdev.lldi.ports[0], 1) > 0) {
1408 set_current_state(TASK_UNINTERRUPTIBLE);
1409 schedule_timeout(usecs_to_jiffies(10));
1410 }
1411 }
1412 }
1413
1414 static void recover_queues(struct uld_ctx *ctx)
1415 {
1416 struct c4iw_qp *qp;
1417 unsigned long index;
1418 int count = 0;
1419 struct qp_list qp_list;
1420 int ret;
1421
1422 /* slow everybody down */
1423 set_current_state(TASK_UNINTERRUPTIBLE);
1424 schedule_timeout(usecs_to_jiffies(1000));
1425
1426 /* flush the SGE contexts */
1427 ret = cxgb4_flush_eq_cache(ctx->dev->rdev.lldi.ports[0]);
1428 if (ret) {
1429 pr_err("%s: Fatal error - DB overflow recovery failed\n",
1430 pci_name(ctx->lldi.pdev));
1431 return;
1432 }
1433
1434 /* Count active queues so we can build a list of queues to recover */
1435 xa_lock_irq(&ctx->dev->qps);
1436 WARN_ON(ctx->dev->db_state != STOPPED);
1437 ctx->dev->db_state = RECOVERY;
1438 xa_for_each(&ctx->dev->qps, index, qp)
1439 count++;
1440
1441 qp_list.qps = kcalloc(count, sizeof(*qp_list.qps), GFP_ATOMIC);
1442 if (!qp_list.qps) {
1443 xa_unlock_irq(&ctx->dev->qps);
1444 return;
1445 }
1446 qp_list.idx = 0;
1447
1448 /* add and ref each qp so it doesn't get freed */
1449 xa_for_each(&ctx->dev->qps, index, qp) {
1450 c4iw_qp_add_ref(&qp->ibqp);
1451 qp_list.qps[qp_list.idx++] = qp;
1452 }
1453
1454 xa_unlock_irq(&ctx->dev->qps);
1455
1456 /* now traverse the list in a safe context to recover the db state*/
1457 recover_lost_dbs(ctx, &qp_list);
1458
1459 /* we're almost done! deref the qps and clean up */
1460 deref_qps(&qp_list);
1461 kfree(qp_list.qps);
1462
1463 xa_lock_irq(&ctx->dev->qps);
1464 WARN_ON(ctx->dev->db_state != RECOVERY);
1465 ctx->dev->db_state = STOPPED;
1466 xa_unlock_irq(&ctx->dev->qps);
1467 }
1468
1469 static int c4iw_uld_control(void *handle, enum cxgb4_control control, ...)
1470 {
1471 struct uld_ctx *ctx = handle;
1472
1473 switch (control) {
1474 case CXGB4_CONTROL_DB_FULL:
1475 stop_queues(ctx);
1476 ctx->dev->rdev.stats.db_full++;
1477 break;
1478 case CXGB4_CONTROL_DB_EMPTY:
1479 resume_queues(ctx);
1480 mutex_lock(&ctx->dev->rdev.stats.lock);
1481 ctx->dev->rdev.stats.db_empty++;
1482 mutex_unlock(&ctx->dev->rdev.stats.lock);
1483 break;
1484 case CXGB4_CONTROL_DB_DROP:
1485 recover_queues(ctx);
1486 mutex_lock(&ctx->dev->rdev.stats.lock);
1487 ctx->dev->rdev.stats.db_drop++;
1488 mutex_unlock(&ctx->dev->rdev.stats.lock);
1489 break;
1490 default:
1491 pr_warn("%s: unknown control cmd %u\n",
1492 pci_name(ctx->lldi.pdev), control);
1493 break;
1494 }
1495 return 0;
1496 }
1497
1498 static struct cxgb4_uld_info c4iw_uld_info = {
1499 .name = DRV_NAME,
1500 .nrxq = MAX_ULD_QSETS,
1501 .ntxq = MAX_ULD_QSETS,
1502 .rxq_size = 511,
1503 .ciq = true,
1504 .lro = false,
1505 .add = c4iw_uld_add,
1506 .rx_handler = c4iw_uld_rx_handler,
1507 .state_change = c4iw_uld_state_change,
1508 .control = c4iw_uld_control,
1509 };
1510
1511 void _c4iw_free_wr_wait(struct kref *kref)
1512 {
1513 struct c4iw_wr_wait *wr_waitp;
1514
1515 wr_waitp = container_of(kref, struct c4iw_wr_wait, kref);
1516 pr_debug("Free wr_wait %p\n", wr_waitp);
1517 kfree(wr_waitp);
1518 }
1519
1520 struct c4iw_wr_wait *c4iw_alloc_wr_wait(gfp_t gfp)
1521 {
1522 struct c4iw_wr_wait *wr_waitp;
1523
1524 wr_waitp = kzalloc(sizeof(*wr_waitp), gfp);
1525 if (wr_waitp) {
1526 kref_init(&wr_waitp->kref);
1527 pr_debug("wr_wait %p\n", wr_waitp);
1528 }
1529 return wr_waitp;
1530 }
1531
1532 static int __init c4iw_init_module(void)
1533 {
1534 int err;
1535
1536 err = c4iw_cm_init();
1537 if (err)
1538 return err;
1539
1540 c4iw_debugfs_root = debugfs_create_dir(DRV_NAME, NULL);
1541
1542 reg_workq = create_singlethread_workqueue("Register_iWARP_device");
1543 if (!reg_workq) {
1544 pr_err("Failed creating workqueue to register iwarp device\n");
1545 return -ENOMEM;
1546 }
1547
1548 cxgb4_register_uld(CXGB4_ULD_RDMA, &c4iw_uld_info);
1549
1550 return 0;
1551 }
1552
1553 static void __exit c4iw_exit_module(void)
1554 {
1555 struct uld_ctx *ctx, *tmp;
1556
1557 mutex_lock(&dev_mutex);
1558 list_for_each_entry_safe(ctx, tmp, &uld_ctx_list, entry) {
1559 if (ctx->dev)
1560 c4iw_remove(ctx);
1561 kfree(ctx);
1562 }
1563 mutex_unlock(&dev_mutex);
1564 flush_workqueue(reg_workq);
1565 destroy_workqueue(reg_workq);
1566 cxgb4_unregister_uld(CXGB4_ULD_RDMA);
1567 c4iw_cm_term();
1568 debugfs_remove_recursive(c4iw_debugfs_root);
1569 }
1570
1571 module_init(c4iw_init_module);
1572 module_exit(c4iw_exit_module);
Linux with added FPC-III support