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 	debugfs_remove_recursive(ctx->dev->debugfs_root);
957 	c4iw_unregister_device(ctx->dev);
958 	c4iw_dealloc(ctx);
959 }
960 
961 static int rdma_supported(const struct cxgb4_lld_info *infop)
962 {
963 	return infop->vr->stag.size > 0 && infop->vr->pbl.size > 0 &&
964 	       infop->vr->rq.size > 0 && infop->vr->qp.size > 0 &&
965 	       infop->vr->cq.size > 0;
966 }
967 
968 static struct c4iw_dev *c4iw_alloc(const struct cxgb4_lld_info *infop)
969 {
970 	struct c4iw_dev *devp;
971 	int ret;
972 
973 	if (!rdma_supported(infop)) {
974 		pr_info("%s: RDMA not supported on this device\n",
975 			pci_name(infop->pdev));
976 		return ERR_PTR(-ENOSYS);
977 	}
978 	if (!ocqp_supported(infop))
979 		pr_info("%s: On-Chip Queues not supported on this device\n",
980 			pci_name(infop->pdev));
981 
982 	devp = ib_alloc_device(c4iw_dev, ibdev);
983 	if (!devp) {
984 		pr_err("Cannot allocate ib device\n");
985 		return ERR_PTR(-ENOMEM);
986 	}
987 	devp->rdev.lldi = *infop;
988 
989 	/* init various hw-queue params based on lld info */
990 	pr_debug("Ing. padding boundary is %d, egrsstatuspagesize = %d\n",
991 		 devp->rdev.lldi.sge_ingpadboundary,
992 		 devp->rdev.lldi.sge_egrstatuspagesize);
993 
994 	devp->rdev.hw_queue.t4_eq_status_entries =
995 		devp->rdev.lldi.sge_egrstatuspagesize / 64;
996 	devp->rdev.hw_queue.t4_max_eq_size = 65520;
997 	devp->rdev.hw_queue.t4_max_iq_size = 65520;
998 	devp->rdev.hw_queue.t4_max_rq_size = 8192 -
999 		devp->rdev.hw_queue.t4_eq_status_entries - 1;
1000 	devp->rdev.hw_queue.t4_max_sq_size =
1001 		devp->rdev.hw_queue.t4_max_eq_size -
1002 		devp->rdev.hw_queue.t4_eq_status_entries - 1;
1003 	devp->rdev.hw_queue.t4_max_qp_depth =
1004 		devp->rdev.hw_queue.t4_max_rq_size;
1005 	devp->rdev.hw_queue.t4_max_cq_depth =
1006 		devp->rdev.hw_queue.t4_max_iq_size - 2;
1007 	devp->rdev.hw_queue.t4_stat_len =
1008 		devp->rdev.lldi.sge_egrstatuspagesize;
1009 
1010 	/*
1011 	 * For T5/T6 devices, we map all of BAR2 with WC.
1012 	 * For T4 devices with onchip qp mem, we map only that part
1013 	 * of BAR2 with WC.
1014 	 */
1015 	devp->rdev.bar2_pa = pci_resource_start(devp->rdev.lldi.pdev, 2);
1016 	if (!is_t4(devp->rdev.lldi.adapter_type)) {
1017 		devp->rdev.bar2_kva = ioremap_wc(devp->rdev.bar2_pa,
1018 			pci_resource_len(devp->rdev.lldi.pdev, 2));
1019 		if (!devp->rdev.bar2_kva) {
1020 			pr_err("Unable to ioremap BAR2\n");
1021 			ib_dealloc_device(&devp->ibdev);
1022 			return ERR_PTR(-EINVAL);
1023 		}
1024 	} else if (ocqp_supported(infop)) {
1025 		devp->rdev.oc_mw_pa =
1026 			pci_resource_start(devp->rdev.lldi.pdev, 2) +
1027 			pci_resource_len(devp->rdev.lldi.pdev, 2) -
1028 			roundup_pow_of_two(devp->rdev.lldi.vr->ocq.size);
1029 		devp->rdev.oc_mw_kva = ioremap_wc(devp->rdev.oc_mw_pa,
1030 			devp->rdev.lldi.vr->ocq.size);
1031 		if (!devp->rdev.oc_mw_kva) {
1032 			pr_err("Unable to ioremap onchip mem\n");
1033 			ib_dealloc_device(&devp->ibdev);
1034 			return ERR_PTR(-EINVAL);
1035 		}
1036 	}
1037 
1038 	pr_debug("ocq memory: hw_start 0x%x size %u mw_pa 0x%lx mw_kva %p\n",
1039 		 devp->rdev.lldi.vr->ocq.start, devp->rdev.lldi.vr->ocq.size,
1040 		 devp->rdev.oc_mw_pa, devp->rdev.oc_mw_kva);
1041 
1042 	ret = c4iw_rdev_open(&devp->rdev);
1043 	if (ret) {
1044 		pr_err("Unable to open CXIO rdev err %d\n", ret);
1045 		ib_dealloc_device(&devp->ibdev);
1046 		return ERR_PTR(ret);
1047 	}
1048 
1049 	xa_init_flags(&devp->cqs, XA_FLAGS_LOCK_IRQ);
1050 	xa_init_flags(&devp->qps, XA_FLAGS_LOCK_IRQ);
1051 	xa_init_flags(&devp->mrs, XA_FLAGS_LOCK_IRQ);
1052 	xa_init_flags(&devp->hwtids, XA_FLAGS_LOCK_IRQ);
1053 	xa_init_flags(&devp->atids, XA_FLAGS_LOCK_IRQ);
1054 	xa_init_flags(&devp->stids, XA_FLAGS_LOCK_IRQ);
1055 	mutex_init(&devp->rdev.stats.lock);
1056 	mutex_init(&devp->db_mutex);
1057 	INIT_LIST_HEAD(&devp->db_fc_list);
1058 	init_waitqueue_head(&devp->wait);
1059 	devp->avail_ird = devp->rdev.lldi.max_ird_adapter;
1060 
1061 	if (c4iw_debugfs_root) {
1062 		devp->debugfs_root = debugfs_create_dir(
1063 					pci_name(devp->rdev.lldi.pdev),
1064 					c4iw_debugfs_root);
1065 		setup_debugfs(devp);
1066 	}
1067 
1068 
1069 	return devp;
1070 }
1071 
1072 static void *c4iw_uld_add(const struct cxgb4_lld_info *infop)
1073 {
1074 	struct uld_ctx *ctx;
1075 	static int vers_printed;
1076 	int i;
1077 
1078 	if (!vers_printed++)
1079 		pr_info("Chelsio T4/T5 RDMA Driver - version %s\n",
1080 			DRV_VERSION);
1081 
1082 	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
1083 	if (!ctx) {
1084 		ctx = ERR_PTR(-ENOMEM);
1085 		goto out;
1086 	}
1087 	ctx->lldi = *infop;
1088 
1089 	pr_debug("found device %s nchan %u nrxq %u ntxq %u nports %u\n",
1090 		 pci_name(ctx->lldi.pdev),
1091 		 ctx->lldi.nchan, ctx->lldi.nrxq,
1092 		 ctx->lldi.ntxq, ctx->lldi.nports);
1093 
1094 	mutex_lock(&dev_mutex);
1095 	list_add_tail(&ctx->entry, &uld_ctx_list);
1096 	mutex_unlock(&dev_mutex);
1097 
1098 	for (i = 0; i < ctx->lldi.nrxq; i++)
1099 		pr_debug("rxqid[%u] %u\n", i, ctx->lldi.rxq_ids[i]);
1100 out:
1101 	return ctx;
1102 }
1103 
1104 static inline struct sk_buff *copy_gl_to_skb_pkt(const struct pkt_gl *gl,
1105 						 const __be64 *rsp,
1106 						 u32 pktshift)
1107 {
1108 	struct sk_buff *skb;
1109 
1110 	/*
1111 	 * Allocate space for cpl_pass_accept_req which will be synthesized by
1112 	 * driver. Once the driver synthesizes the request the skb will go
1113 	 * through the regular cpl_pass_accept_req processing.
1114 	 * The math here assumes sizeof cpl_pass_accept_req >= sizeof
1115 	 * cpl_rx_pkt.
1116 	 */
1117 	skb = alloc_skb(gl->tot_len + sizeof(struct cpl_pass_accept_req) +
1118 			sizeof(struct rss_header) - pktshift, GFP_ATOMIC);
1119 	if (unlikely(!skb))
1120 		return NULL;
1121 
1122 	__skb_put(skb, gl->tot_len + sizeof(struct cpl_pass_accept_req) +
1123 		  sizeof(struct rss_header) - pktshift);
1124 
1125 	/*
1126 	 * This skb will contain:
1127 	 *   rss_header from the rspq descriptor (1 flit)
1128 	 *   cpl_rx_pkt struct from the rspq descriptor (2 flits)
1129 	 *   space for the difference between the size of an
1130 	 *      rx_pkt and pass_accept_req cpl (1 flit)
1131 	 *   the packet data from the gl
1132 	 */
1133 	skb_copy_to_linear_data(skb, rsp, sizeof(struct cpl_pass_accept_req) +
1134 				sizeof(struct rss_header));
1135 	skb_copy_to_linear_data_offset(skb, sizeof(struct rss_header) +
1136 				       sizeof(struct cpl_pass_accept_req),
1137 				       gl->va + pktshift,
1138 				       gl->tot_len - pktshift);
1139 	return skb;
1140 }
1141 
1142 static inline int recv_rx_pkt(struct c4iw_dev *dev, const struct pkt_gl *gl,
1143 			   const __be64 *rsp)
1144 {
1145 	unsigned int opcode = *(u8 *)rsp;
1146 	struct sk_buff *skb;
1147 
1148 	if (opcode != CPL_RX_PKT)
1149 		goto out;
1150 
1151 	skb = copy_gl_to_skb_pkt(gl , rsp, dev->rdev.lldi.sge_pktshift);
1152 	if (skb == NULL)
1153 		goto out;
1154 
1155 	if (c4iw_handlers[opcode] == NULL) {
1156 		pr_info("%s no handler opcode 0x%x...\n", __func__, opcode);
1157 		kfree_skb(skb);
1158 		goto out;
1159 	}
1160 	c4iw_handlers[opcode](dev, skb);
1161 	return 1;
1162 out:
1163 	return 0;
1164 }
1165 
1166 static int c4iw_uld_rx_handler(void *handle, const __be64 *rsp,
1167 			const struct pkt_gl *gl)
1168 {
1169 	struct uld_ctx *ctx = handle;
1170 	struct c4iw_dev *dev = ctx->dev;
1171 	struct sk_buff *skb;
1172 	u8 opcode;
1173 
1174 	if (gl == NULL) {
1175 		/* omit RSS and rsp_ctrl at end of descriptor */
1176 		unsigned int len = 64 - sizeof(struct rsp_ctrl) - 8;
1177 
1178 		skb = alloc_skb(256, GFP_ATOMIC);
1179 		if (!skb)
1180 			goto nomem;
1181 		__skb_put(skb, len);
1182 		skb_copy_to_linear_data(skb, &rsp[1], len);
1183 	} else if (gl == CXGB4_MSG_AN) {
1184 		const struct rsp_ctrl *rc = (void *)rsp;
1185 
1186 		u32 qid = be32_to_cpu(rc->pldbuflen_qid);
1187 		c4iw_ev_handler(dev, qid);
1188 		return 0;
1189 	} else if (unlikely(*(u8 *)rsp != *(u8 *)gl->va)) {
1190 		if (recv_rx_pkt(dev, gl, rsp))
1191 			return 0;
1192 
1193 		pr_info("%s: unexpected FL contents at %p, RSS %#llx, FL %#llx, len %u\n",
1194 			pci_name(ctx->lldi.pdev), gl->va,
1195 			be64_to_cpu(*rsp),
1196 			be64_to_cpu(*(__force __be64 *)gl->va),
1197 			gl->tot_len);
1198 
1199 		return 0;
1200 	} else {
1201 		skb = cxgb4_pktgl_to_skb(gl, 128, 128);
1202 		if (unlikely(!skb))
1203 			goto nomem;
1204 	}
1205 
1206 	opcode = *(u8 *)rsp;
1207 	if (c4iw_handlers[opcode]) {
1208 		c4iw_handlers[opcode](dev, skb);
1209 	} else {
1210 		pr_info("%s no handler opcode 0x%x...\n", __func__, opcode);
1211 		kfree_skb(skb);
1212 	}
1213 
1214 	return 0;
1215 nomem:
1216 	return -1;
1217 }
1218 
1219 static int c4iw_uld_state_change(void *handle, enum cxgb4_state new_state)
1220 {
1221 	struct uld_ctx *ctx = handle;
1222 
1223 	pr_debug("new_state %u\n", new_state);
1224 	switch (new_state) {
1225 	case CXGB4_STATE_UP:
1226 		pr_info("%s: Up\n", pci_name(ctx->lldi.pdev));
1227 		if (!ctx->dev) {
1228 			ctx->dev = c4iw_alloc(&ctx->lldi);
1229 			if (IS_ERR(ctx->dev)) {
1230 				pr_err("%s: initialization failed: %ld\n",
1231 				       pci_name(ctx->lldi.pdev),
1232 				       PTR_ERR(ctx->dev));
1233 				ctx->dev = NULL;
1234 				break;
1235 			}
1236 
1237 			INIT_WORK(&ctx->reg_work, c4iw_register_device);
1238 			queue_work(reg_workq, &ctx->reg_work);
1239 		}
1240 		break;
1241 	case CXGB4_STATE_DOWN:
1242 		pr_info("%s: Down\n", pci_name(ctx->lldi.pdev));
1243 		if (ctx->dev)
1244 			c4iw_remove(ctx);
1245 		break;
1246 	case CXGB4_STATE_FATAL_ERROR:
1247 	case CXGB4_STATE_START_RECOVERY:
1248 		pr_info("%s: Fatal Error\n", pci_name(ctx->lldi.pdev));
1249 		if (ctx->dev) {
1250 			struct ib_event event = {};
1251 
1252 			ctx->dev->rdev.flags |= T4_FATAL_ERROR;
1253 			event.event  = IB_EVENT_DEVICE_FATAL;
1254 			event.device = &ctx->dev->ibdev;
1255 			ib_dispatch_event(&event);
1256 			c4iw_remove(ctx);
1257 		}
1258 		break;
1259 	case CXGB4_STATE_DETACH:
1260 		pr_info("%s: Detach\n", pci_name(ctx->lldi.pdev));
1261 		if (ctx->dev)
1262 			c4iw_remove(ctx);
1263 		break;
1264 	}
1265 	return 0;
1266 }
1267 
1268 static void stop_queues(struct uld_ctx *ctx)
1269 {
1270 	struct c4iw_qp *qp;
1271 	unsigned long index, flags;
1272 
1273 	xa_lock_irqsave(&ctx->dev->qps, flags);
1274 	ctx->dev->rdev.stats.db_state_transitions++;
1275 	ctx->dev->db_state = STOPPED;
1276 	if (ctx->dev->rdev.flags & T4_STATUS_PAGE_DISABLED) {
1277 		xa_for_each(&ctx->dev->qps, index, qp)
1278 			t4_disable_wq_db(&qp->wq);
1279 	} else {
1280 		ctx->dev->rdev.status_page->db_off = 1;
1281 	}
1282 	xa_unlock_irqrestore(&ctx->dev->qps, flags);
1283 }
1284 
1285 static void resume_rc_qp(struct c4iw_qp *qp)
1286 {
1287 	spin_lock(&qp->lock);
1288 	t4_ring_sq_db(&qp->wq, qp->wq.sq.wq_pidx_inc, NULL);
1289 	qp->wq.sq.wq_pidx_inc = 0;
1290 	t4_ring_rq_db(&qp->wq, qp->wq.rq.wq_pidx_inc, NULL);
1291 	qp->wq.rq.wq_pidx_inc = 0;
1292 	spin_unlock(&qp->lock);
1293 }
1294 
1295 static void resume_a_chunk(struct uld_ctx *ctx)
1296 {
1297 	int i;
1298 	struct c4iw_qp *qp;
1299 
1300 	for (i = 0; i < DB_FC_RESUME_SIZE; i++) {
1301 		qp = list_first_entry(&ctx->dev->db_fc_list, struct c4iw_qp,
1302 				      db_fc_entry);
1303 		list_del_init(&qp->db_fc_entry);
1304 		resume_rc_qp(qp);
1305 		if (list_empty(&ctx->dev->db_fc_list))
1306 			break;
1307 	}
1308 }
1309 
1310 static void resume_queues(struct uld_ctx *ctx)
1311 {
1312 	xa_lock_irq(&ctx->dev->qps);
1313 	if (ctx->dev->db_state != STOPPED)
1314 		goto out;
1315 	ctx->dev->db_state = FLOW_CONTROL;
1316 	while (1) {
1317 		if (list_empty(&ctx->dev->db_fc_list)) {
1318 			struct c4iw_qp *qp;
1319 			unsigned long index;
1320 
1321 			WARN_ON(ctx->dev->db_state != FLOW_CONTROL);
1322 			ctx->dev->db_state = NORMAL;
1323 			ctx->dev->rdev.stats.db_state_transitions++;
1324 			if (ctx->dev->rdev.flags & T4_STATUS_PAGE_DISABLED) {
1325 				xa_for_each(&ctx->dev->qps, index, qp)
1326 					t4_enable_wq_db(&qp->wq);
1327 			} else {
1328 				ctx->dev->rdev.status_page->db_off = 0;
1329 			}
1330 			break;
1331 		} else {
1332 			if (cxgb4_dbfifo_count(ctx->dev->rdev.lldi.ports[0], 1)
1333 			    < (ctx->dev->rdev.lldi.dbfifo_int_thresh <<
1334 			       DB_FC_DRAIN_THRESH)) {
1335 				resume_a_chunk(ctx);
1336 			}
1337 			if (!list_empty(&ctx->dev->db_fc_list)) {
1338 				xa_unlock_irq(&ctx->dev->qps);
1339 				if (DB_FC_RESUME_DELAY) {
1340 					set_current_state(TASK_UNINTERRUPTIBLE);
1341 					schedule_timeout(DB_FC_RESUME_DELAY);
1342 				}
1343 				xa_lock_irq(&ctx->dev->qps);
1344 				if (ctx->dev->db_state != FLOW_CONTROL)
1345 					break;
1346 			}
1347 		}
1348 	}
1349 out:
1350 	if (ctx->dev->db_state != NORMAL)
1351 		ctx->dev->rdev.stats.db_fc_interruptions++;
1352 	xa_unlock_irq(&ctx->dev->qps);
1353 }
1354 
1355 struct qp_list {
1356 	unsigned idx;
1357 	struct c4iw_qp **qps;
1358 };
1359 
1360 static void deref_qps(struct qp_list *qp_list)
1361 {
1362 	int idx;
1363 
1364 	for (idx = 0; idx < qp_list->idx; idx++)
1365 		c4iw_qp_rem_ref(&qp_list->qps[idx]->ibqp);
1366 }
1367 
1368 static void recover_lost_dbs(struct uld_ctx *ctx, struct qp_list *qp_list)
1369 {
1370 	int idx;
1371 	int ret;
1372 
1373 	for (idx = 0; idx < qp_list->idx; idx++) {
1374 		struct c4iw_qp *qp = qp_list->qps[idx];
1375 
1376 		xa_lock_irq(&qp->rhp->qps);
1377 		spin_lock(&qp->lock);
1378 		ret = cxgb4_sync_txq_pidx(qp->rhp->rdev.lldi.ports[0],
1379 					  qp->wq.sq.qid,
1380 					  t4_sq_host_wq_pidx(&qp->wq),
1381 					  t4_sq_wq_size(&qp->wq));
1382 		if (ret) {
1383 			pr_err("%s: Fatal error - DB overflow recovery failed - error syncing SQ qid %u\n",
1384 			       pci_name(ctx->lldi.pdev), qp->wq.sq.qid);
1385 			spin_unlock(&qp->lock);
1386 			xa_unlock_irq(&qp->rhp->qps);
1387 			return;
1388 		}
1389 		qp->wq.sq.wq_pidx_inc = 0;
1390 
1391 		ret = cxgb4_sync_txq_pidx(qp->rhp->rdev.lldi.ports[0],
1392 					  qp->wq.rq.qid,
1393 					  t4_rq_host_wq_pidx(&qp->wq),
1394 					  t4_rq_wq_size(&qp->wq));
1395 
1396 		if (ret) {
1397 			pr_err("%s: Fatal error - DB overflow recovery failed - error syncing RQ qid %u\n",
1398 			       pci_name(ctx->lldi.pdev), qp->wq.rq.qid);
1399 			spin_unlock(&qp->lock);
1400 			xa_unlock_irq(&qp->rhp->qps);
1401 			return;
1402 		}
1403 		qp->wq.rq.wq_pidx_inc = 0;
1404 		spin_unlock(&qp->lock);
1405 		xa_unlock_irq(&qp->rhp->qps);
1406 
1407 		/* Wait for the dbfifo to drain */
1408 		while (cxgb4_dbfifo_count(qp->rhp->rdev.lldi.ports[0], 1) > 0) {
1409 			set_current_state(TASK_UNINTERRUPTIBLE);
1410 			schedule_timeout(usecs_to_jiffies(10));
1411 		}
1412 	}
1413 }
1414 
1415 static void recover_queues(struct uld_ctx *ctx)
1416 {
1417 	struct c4iw_qp *qp;
1418 	unsigned long index;
1419 	int count = 0;
1420 	struct qp_list qp_list;
1421 	int ret;
1422 
1423 	/* slow everybody down */
1424 	set_current_state(TASK_UNINTERRUPTIBLE);
1425 	schedule_timeout(usecs_to_jiffies(1000));
1426 
1427 	/* flush the SGE contexts */
1428 	ret = cxgb4_flush_eq_cache(ctx->dev->rdev.lldi.ports[0]);
1429 	if (ret) {
1430 		pr_err("%s: Fatal error - DB overflow recovery failed\n",
1431 		       pci_name(ctx->lldi.pdev));
1432 		return;
1433 	}
1434 
1435 	/* Count active queues so we can build a list of queues to recover */
1436 	xa_lock_irq(&ctx->dev->qps);
1437 	WARN_ON(ctx->dev->db_state != STOPPED);
1438 	ctx->dev->db_state = RECOVERY;
1439 	xa_for_each(&ctx->dev->qps, index, qp)
1440 		count++;
1441 
1442 	qp_list.qps = kcalloc(count, sizeof(*qp_list.qps), GFP_ATOMIC);
1443 	if (!qp_list.qps) {
1444 		xa_unlock_irq(&ctx->dev->qps);
1445 		return;
1446 	}
1447 	qp_list.idx = 0;
1448 
1449 	/* add and ref each qp so it doesn't get freed */
1450 	xa_for_each(&ctx->dev->qps, index, qp) {
1451 		c4iw_qp_add_ref(&qp->ibqp);
1452 		qp_list.qps[qp_list.idx++] = qp;
1453 	}
1454 
1455 	xa_unlock_irq(&ctx->dev->qps);
1456 
1457 	/* now traverse the list in a safe context to recover the db state*/
1458 	recover_lost_dbs(ctx, &qp_list);
1459 
1460 	/* we're almost done!  deref the qps and clean up */
1461 	deref_qps(&qp_list);
1462 	kfree(qp_list.qps);
1463 
1464 	xa_lock_irq(&ctx->dev->qps);
1465 	WARN_ON(ctx->dev->db_state != RECOVERY);
1466 	ctx->dev->db_state = STOPPED;
1467 	xa_unlock_irq(&ctx->dev->qps);
1468 }
1469 
1470 static int c4iw_uld_control(void *handle, enum cxgb4_control control, ...)
1471 {
1472 	struct uld_ctx *ctx = handle;
1473 
1474 	switch (control) {
1475 	case CXGB4_CONTROL_DB_FULL:
1476 		stop_queues(ctx);
1477 		ctx->dev->rdev.stats.db_full++;
1478 		break;
1479 	case CXGB4_CONTROL_DB_EMPTY:
1480 		resume_queues(ctx);
1481 		mutex_lock(&ctx->dev->rdev.stats.lock);
1482 		ctx->dev->rdev.stats.db_empty++;
1483 		mutex_unlock(&ctx->dev->rdev.stats.lock);
1484 		break;
1485 	case CXGB4_CONTROL_DB_DROP:
1486 		recover_queues(ctx);
1487 		mutex_lock(&ctx->dev->rdev.stats.lock);
1488 		ctx->dev->rdev.stats.db_drop++;
1489 		mutex_unlock(&ctx->dev->rdev.stats.lock);
1490 		break;
1491 	default:
1492 		pr_warn("%s: unknown control cmd %u\n",
1493 			pci_name(ctx->lldi.pdev), control);
1494 		break;
1495 	}
1496 	return 0;
1497 }
1498 
1499 static struct cxgb4_uld_info c4iw_uld_info = {
1500 	.name = DRV_NAME,
1501 	.nrxq = MAX_ULD_QSETS,
1502 	.ntxq = MAX_ULD_QSETS,
1503 	.rxq_size = 511,
1504 	.ciq = true,
1505 	.lro = false,
1506 	.add = c4iw_uld_add,
1507 	.rx_handler = c4iw_uld_rx_handler,
1508 	.state_change = c4iw_uld_state_change,
1509 	.control = c4iw_uld_control,
1510 };
1511 
1512 void _c4iw_free_wr_wait(struct kref *kref)
1513 {
1514 	struct c4iw_wr_wait *wr_waitp;
1515 
1516 	wr_waitp = container_of(kref, struct c4iw_wr_wait, kref);
1517 	pr_debug("Free wr_wait %p\n", wr_waitp);
1518 	kfree(wr_waitp);
1519 }
1520 
1521 struct c4iw_wr_wait *c4iw_alloc_wr_wait(gfp_t gfp)
1522 {
1523 	struct c4iw_wr_wait *wr_waitp;
1524 
1525 	wr_waitp = kzalloc(sizeof(*wr_waitp), gfp);
1526 	if (wr_waitp) {
1527 		kref_init(&wr_waitp->kref);
1528 		pr_debug("wr_wait %p\n", wr_waitp);
1529 	}
1530 	return wr_waitp;
1531 }
1532 
1533 static int __init c4iw_init_module(void)
1534 {
1535 	int err;
1536 
1537 	err = c4iw_cm_init();
1538 	if (err)
1539 		return err;
1540 
1541 	c4iw_debugfs_root = debugfs_create_dir(DRV_NAME, NULL);
1542 
1543 	reg_workq = create_singlethread_workqueue("Register_iWARP_device");
1544 	if (!reg_workq) {
1545 		pr_err("Failed creating workqueue to register iwarp device\n");
1546 		return -ENOMEM;
1547 	}
1548 
1549 	cxgb4_register_uld(CXGB4_ULD_RDMA, &c4iw_uld_info);
1550 
1551 	return 0;
1552 }
1553 
1554 static void __exit c4iw_exit_module(void)
1555 {
1556 	struct uld_ctx *ctx, *tmp;
1557 
1558 	mutex_lock(&dev_mutex);
1559 	list_for_each_entry_safe(ctx, tmp, &uld_ctx_list, entry) {
1560 		if (ctx->dev)
1561 			c4iw_remove(ctx);
1562 		kfree(ctx);
1563 	}
1564 	mutex_unlock(&dev_mutex);
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);
1573