xref: /openbmc/linux/drivers/infiniband/sw/rxe/rxe_qp.c (revision 82003e04)
1 /*
2  * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
3  * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
4  *
5  * This software is available to you under a choice of one of two
6  * licenses.  You may choose to be licensed under the terms of the GNU
7  * General Public License (GPL) Version 2, available from the file
8  * COPYING in the main directory of this source tree, or the
9  * OpenIB.org BSD license below:
10  *
11  *	   Redistribution and use in source and binary forms, with or
12  *	   without modification, are permitted provided that the following
13  *	   conditions are met:
14  *
15  *		- Redistributions of source code must retain the above
16  *		  copyright notice, this list of conditions and the following
17  *		  disclaimer.
18  *
19  *		- Redistributions in binary form must reproduce the above
20  *		  copyright notice, this list of conditions and the following
21  *		  disclaimer in the documentation and/or other materials
22  *		  provided with the distribution.
23  *
24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31  * SOFTWARE.
32  */
33 
34 #include <linux/skbuff.h>
35 #include <linux/delay.h>
36 #include <linux/sched.h>
37 
38 #include "rxe.h"
39 #include "rxe_loc.h"
40 #include "rxe_queue.h"
41 #include "rxe_task.h"
42 
43 char *rxe_qp_state_name[] = {
44 	[QP_STATE_RESET]	= "RESET",
45 	[QP_STATE_INIT]		= "INIT",
46 	[QP_STATE_READY]	= "READY",
47 	[QP_STATE_DRAIN]	= "DRAIN",
48 	[QP_STATE_DRAINED]	= "DRAINED",
49 	[QP_STATE_ERROR]	= "ERROR",
50 };
51 
52 static int rxe_qp_chk_cap(struct rxe_dev *rxe, struct ib_qp_cap *cap,
53 			  int has_srq)
54 {
55 	if (cap->max_send_wr > rxe->attr.max_qp_wr) {
56 		pr_warn("invalid send wr = %d > %d\n",
57 			cap->max_send_wr, rxe->attr.max_qp_wr);
58 		goto err1;
59 	}
60 
61 	if (cap->max_send_sge > rxe->attr.max_sge) {
62 		pr_warn("invalid send sge = %d > %d\n",
63 			cap->max_send_sge, rxe->attr.max_sge);
64 		goto err1;
65 	}
66 
67 	if (!has_srq) {
68 		if (cap->max_recv_wr > rxe->attr.max_qp_wr) {
69 			pr_warn("invalid recv wr = %d > %d\n",
70 				cap->max_recv_wr, rxe->attr.max_qp_wr);
71 			goto err1;
72 		}
73 
74 		if (cap->max_recv_sge > rxe->attr.max_sge) {
75 			pr_warn("invalid recv sge = %d > %d\n",
76 				cap->max_recv_sge, rxe->attr.max_sge);
77 			goto err1;
78 		}
79 	}
80 
81 	if (cap->max_inline_data > rxe->max_inline_data) {
82 		pr_warn("invalid max inline data = %d > %d\n",
83 			cap->max_inline_data, rxe->max_inline_data);
84 		goto err1;
85 	}
86 
87 	return 0;
88 
89 err1:
90 	return -EINVAL;
91 }
92 
93 int rxe_qp_chk_init(struct rxe_dev *rxe, struct ib_qp_init_attr *init)
94 {
95 	struct ib_qp_cap *cap = &init->cap;
96 	struct rxe_port *port;
97 	int port_num = init->port_num;
98 
99 	if (!init->recv_cq || !init->send_cq) {
100 		pr_warn("missing cq\n");
101 		goto err1;
102 	}
103 
104 	if (rxe_qp_chk_cap(rxe, cap, !!init->srq))
105 		goto err1;
106 
107 	if (init->qp_type == IB_QPT_SMI || init->qp_type == IB_QPT_GSI) {
108 		if (port_num != 1) {
109 			pr_warn("invalid port = %d\n", port_num);
110 			goto err1;
111 		}
112 
113 		port = &rxe->port;
114 
115 		if (init->qp_type == IB_QPT_SMI && port->qp_smi_index) {
116 			pr_warn("SMI QP exists for port %d\n", port_num);
117 			goto err1;
118 		}
119 
120 		if (init->qp_type == IB_QPT_GSI && port->qp_gsi_index) {
121 			pr_warn("GSI QP exists for port %d\n", port_num);
122 			goto err1;
123 		}
124 	}
125 
126 	return 0;
127 
128 err1:
129 	return -EINVAL;
130 }
131 
132 static int alloc_rd_atomic_resources(struct rxe_qp *qp, unsigned int n)
133 {
134 	qp->resp.res_head = 0;
135 	qp->resp.res_tail = 0;
136 	qp->resp.resources = kcalloc(n, sizeof(struct resp_res), GFP_KERNEL);
137 
138 	if (!qp->resp.resources)
139 		return -ENOMEM;
140 
141 	return 0;
142 }
143 
144 static void free_rd_atomic_resources(struct rxe_qp *qp)
145 {
146 	if (qp->resp.resources) {
147 		int i;
148 
149 		for (i = 0; i < qp->attr.max_dest_rd_atomic; i++) {
150 			struct resp_res *res = &qp->resp.resources[i];
151 
152 			free_rd_atomic_resource(qp, res);
153 		}
154 		kfree(qp->resp.resources);
155 		qp->resp.resources = NULL;
156 	}
157 }
158 
159 void free_rd_atomic_resource(struct rxe_qp *qp, struct resp_res *res)
160 {
161 	if (res->type == RXE_ATOMIC_MASK) {
162 		rxe_drop_ref(qp);
163 		kfree_skb(res->atomic.skb);
164 	} else if (res->type == RXE_READ_MASK) {
165 		if (res->read.mr)
166 			rxe_drop_ref(res->read.mr);
167 	}
168 	res->type = 0;
169 }
170 
171 static void cleanup_rd_atomic_resources(struct rxe_qp *qp)
172 {
173 	int i;
174 	struct resp_res *res;
175 
176 	if (qp->resp.resources) {
177 		for (i = 0; i < qp->attr.max_dest_rd_atomic; i++) {
178 			res = &qp->resp.resources[i];
179 			free_rd_atomic_resource(qp, res);
180 		}
181 	}
182 }
183 
184 static void rxe_qp_init_misc(struct rxe_dev *rxe, struct rxe_qp *qp,
185 			     struct ib_qp_init_attr *init)
186 {
187 	struct rxe_port *port;
188 	u32 qpn;
189 
190 	qp->sq_sig_type		= init->sq_sig_type;
191 	qp->attr.path_mtu	= 1;
192 	qp->mtu			= ib_mtu_enum_to_int(qp->attr.path_mtu);
193 
194 	qpn			= qp->pelem.index;
195 	port			= &rxe->port;
196 
197 	switch (init->qp_type) {
198 	case IB_QPT_SMI:
199 		qp->ibqp.qp_num		= 0;
200 		port->qp_smi_index	= qpn;
201 		qp->attr.port_num	= init->port_num;
202 		break;
203 
204 	case IB_QPT_GSI:
205 		qp->ibqp.qp_num		= 1;
206 		port->qp_gsi_index	= qpn;
207 		qp->attr.port_num	= init->port_num;
208 		break;
209 
210 	default:
211 		qp->ibqp.qp_num		= qpn;
212 		break;
213 	}
214 
215 	INIT_LIST_HEAD(&qp->grp_list);
216 
217 	skb_queue_head_init(&qp->send_pkts);
218 
219 	spin_lock_init(&qp->grp_lock);
220 	spin_lock_init(&qp->state_lock);
221 
222 	atomic_set(&qp->ssn, 0);
223 	atomic_set(&qp->skb_out, 0);
224 }
225 
226 static int rxe_qp_init_req(struct rxe_dev *rxe, struct rxe_qp *qp,
227 			   struct ib_qp_init_attr *init,
228 			   struct ib_ucontext *context, struct ib_udata *udata)
229 {
230 	int err;
231 	int wqe_size;
232 
233 	err = sock_create_kern(&init_net, AF_INET, SOCK_DGRAM, 0, &qp->sk);
234 	if (err < 0)
235 		return err;
236 	qp->sk->sk->sk_user_data = qp;
237 
238 	qp->sq.max_wr		= init->cap.max_send_wr;
239 	qp->sq.max_sge		= init->cap.max_send_sge;
240 	qp->sq.max_inline	= init->cap.max_inline_data;
241 
242 	wqe_size = max_t(int, sizeof(struct rxe_send_wqe) +
243 			 qp->sq.max_sge * sizeof(struct ib_sge),
244 			 sizeof(struct rxe_send_wqe) +
245 			 qp->sq.max_inline);
246 
247 	qp->sq.queue = rxe_queue_init(rxe,
248 				      &qp->sq.max_wr,
249 				      wqe_size);
250 	if (!qp->sq.queue)
251 		return -ENOMEM;
252 
253 	err = do_mmap_info(rxe, udata, true,
254 			   context, qp->sq.queue->buf,
255 			   qp->sq.queue->buf_size, &qp->sq.queue->ip);
256 
257 	if (err) {
258 		kvfree(qp->sq.queue->buf);
259 		kfree(qp->sq.queue);
260 		return err;
261 	}
262 
263 	qp->req.wqe_index	= producer_index(qp->sq.queue);
264 	qp->req.state		= QP_STATE_RESET;
265 	qp->req.opcode		= -1;
266 	qp->comp.opcode		= -1;
267 
268 	spin_lock_init(&qp->sq.sq_lock);
269 	skb_queue_head_init(&qp->req_pkts);
270 
271 	rxe_init_task(rxe, &qp->req.task, qp,
272 		      rxe_requester, "req");
273 	rxe_init_task(rxe, &qp->comp.task, qp,
274 		      rxe_completer, "comp");
275 
276 	init_timer(&qp->rnr_nak_timer);
277 	qp->rnr_nak_timer.function = rnr_nak_timer;
278 	qp->rnr_nak_timer.data = (unsigned long)qp;
279 
280 	init_timer(&qp->retrans_timer);
281 	qp->retrans_timer.function = retransmit_timer;
282 	qp->retrans_timer.data = (unsigned long)qp;
283 	qp->qp_timeout_jiffies = 0; /* Can't be set for UD/UC in modify_qp */
284 
285 	return 0;
286 }
287 
288 static int rxe_qp_init_resp(struct rxe_dev *rxe, struct rxe_qp *qp,
289 			    struct ib_qp_init_attr *init,
290 			    struct ib_ucontext *context, struct ib_udata *udata)
291 {
292 	int err;
293 	int wqe_size;
294 
295 	if (!qp->srq) {
296 		qp->rq.max_wr		= init->cap.max_recv_wr;
297 		qp->rq.max_sge		= init->cap.max_recv_sge;
298 
299 		wqe_size = rcv_wqe_size(qp->rq.max_sge);
300 
301 		pr_debug("qp#%d max_wr = %d, max_sge = %d, wqe_size = %d\n",
302 			 qp_num(qp), qp->rq.max_wr, qp->rq.max_sge, wqe_size);
303 
304 		qp->rq.queue = rxe_queue_init(rxe,
305 					      &qp->rq.max_wr,
306 					      wqe_size);
307 		if (!qp->rq.queue)
308 			return -ENOMEM;
309 
310 		err = do_mmap_info(rxe, udata, false, context,
311 				   qp->rq.queue->buf,
312 				   qp->rq.queue->buf_size,
313 				   &qp->rq.queue->ip);
314 		if (err) {
315 			kvfree(qp->rq.queue->buf);
316 			kfree(qp->rq.queue);
317 			return err;
318 		}
319 	}
320 
321 	spin_lock_init(&qp->rq.producer_lock);
322 	spin_lock_init(&qp->rq.consumer_lock);
323 
324 	skb_queue_head_init(&qp->resp_pkts);
325 
326 	rxe_init_task(rxe, &qp->resp.task, qp,
327 		      rxe_responder, "resp");
328 
329 	qp->resp.opcode		= OPCODE_NONE;
330 	qp->resp.msn		= 0;
331 	qp->resp.state		= QP_STATE_RESET;
332 
333 	return 0;
334 }
335 
336 /* called by the create qp verb */
337 int rxe_qp_from_init(struct rxe_dev *rxe, struct rxe_qp *qp, struct rxe_pd *pd,
338 		     struct ib_qp_init_attr *init, struct ib_udata *udata,
339 		     struct ib_pd *ibpd)
340 {
341 	int err;
342 	struct rxe_cq *rcq = to_rcq(init->recv_cq);
343 	struct rxe_cq *scq = to_rcq(init->send_cq);
344 	struct rxe_srq *srq = init->srq ? to_rsrq(init->srq) : NULL;
345 	struct ib_ucontext *context = udata ? ibpd->uobject->context : NULL;
346 
347 	rxe_add_ref(pd);
348 	rxe_add_ref(rcq);
349 	rxe_add_ref(scq);
350 	if (srq)
351 		rxe_add_ref(srq);
352 
353 	qp->pd			= pd;
354 	qp->rcq			= rcq;
355 	qp->scq			= scq;
356 	qp->srq			= srq;
357 
358 	rxe_qp_init_misc(rxe, qp, init);
359 
360 	err = rxe_qp_init_req(rxe, qp, init, context, udata);
361 	if (err)
362 		goto err1;
363 
364 	err = rxe_qp_init_resp(rxe, qp, init, context, udata);
365 	if (err)
366 		goto err2;
367 
368 	qp->attr.qp_state = IB_QPS_RESET;
369 	qp->valid = 1;
370 
371 	return 0;
372 
373 err2:
374 	rxe_queue_cleanup(qp->sq.queue);
375 err1:
376 	if (srq)
377 		rxe_drop_ref(srq);
378 	rxe_drop_ref(scq);
379 	rxe_drop_ref(rcq);
380 	rxe_drop_ref(pd);
381 
382 	return err;
383 }
384 
385 /* called by the query qp verb */
386 int rxe_qp_to_init(struct rxe_qp *qp, struct ib_qp_init_attr *init)
387 {
388 	init->event_handler		= qp->ibqp.event_handler;
389 	init->qp_context		= qp->ibqp.qp_context;
390 	init->send_cq			= qp->ibqp.send_cq;
391 	init->recv_cq			= qp->ibqp.recv_cq;
392 	init->srq			= qp->ibqp.srq;
393 
394 	init->cap.max_send_wr		= qp->sq.max_wr;
395 	init->cap.max_send_sge		= qp->sq.max_sge;
396 	init->cap.max_inline_data	= qp->sq.max_inline;
397 
398 	if (!qp->srq) {
399 		init->cap.max_recv_wr		= qp->rq.max_wr;
400 		init->cap.max_recv_sge		= qp->rq.max_sge;
401 	}
402 
403 	init->sq_sig_type		= qp->sq_sig_type;
404 
405 	init->qp_type			= qp->ibqp.qp_type;
406 	init->port_num			= 1;
407 
408 	return 0;
409 }
410 
411 /* called by the modify qp verb, this routine checks all the parameters before
412  * making any changes
413  */
414 int rxe_qp_chk_attr(struct rxe_dev *rxe, struct rxe_qp *qp,
415 		    struct ib_qp_attr *attr, int mask)
416 {
417 	enum ib_qp_state cur_state = (mask & IB_QP_CUR_STATE) ?
418 					attr->cur_qp_state : qp->attr.qp_state;
419 	enum ib_qp_state new_state = (mask & IB_QP_STATE) ?
420 					attr->qp_state : cur_state;
421 
422 	if (!ib_modify_qp_is_ok(cur_state, new_state, qp_type(qp), mask,
423 				IB_LINK_LAYER_ETHERNET)) {
424 		pr_warn("invalid mask or state for qp\n");
425 		goto err1;
426 	}
427 
428 	if (mask & IB_QP_STATE) {
429 		if (cur_state == IB_QPS_SQD) {
430 			if (qp->req.state == QP_STATE_DRAIN &&
431 			    new_state != IB_QPS_ERR)
432 				goto err1;
433 		}
434 	}
435 
436 	if (mask & IB_QP_PORT) {
437 		if (attr->port_num != 1) {
438 			pr_warn("invalid port %d\n", attr->port_num);
439 			goto err1;
440 		}
441 	}
442 
443 	if (mask & IB_QP_CAP && rxe_qp_chk_cap(rxe, &attr->cap, !!qp->srq))
444 		goto err1;
445 
446 	if (mask & IB_QP_AV && rxe_av_chk_attr(rxe, &attr->ah_attr))
447 		goto err1;
448 
449 	if (mask & IB_QP_ALT_PATH) {
450 		if (rxe_av_chk_attr(rxe, &attr->alt_ah_attr))
451 			goto err1;
452 		if (attr->alt_port_num != 1) {
453 			pr_warn("invalid alt port %d\n", attr->alt_port_num);
454 			goto err1;
455 		}
456 		if (attr->alt_timeout > 31) {
457 			pr_warn("invalid QP alt timeout %d > 31\n",
458 				attr->alt_timeout);
459 			goto err1;
460 		}
461 	}
462 
463 	if (mask & IB_QP_PATH_MTU) {
464 		struct rxe_port *port = &rxe->port;
465 
466 		enum ib_mtu max_mtu = port->attr.max_mtu;
467 		enum ib_mtu mtu = attr->path_mtu;
468 
469 		if (mtu > max_mtu) {
470 			pr_debug("invalid mtu (%d) > (%d)\n",
471 				 ib_mtu_enum_to_int(mtu),
472 				 ib_mtu_enum_to_int(max_mtu));
473 			goto err1;
474 		}
475 	}
476 
477 	if (mask & IB_QP_MAX_QP_RD_ATOMIC) {
478 		if (attr->max_rd_atomic > rxe->attr.max_qp_rd_atom) {
479 			pr_warn("invalid max_rd_atomic %d > %d\n",
480 				attr->max_rd_atomic,
481 				rxe->attr.max_qp_rd_atom);
482 			goto err1;
483 		}
484 	}
485 
486 	if (mask & IB_QP_TIMEOUT) {
487 		if (attr->timeout > 31) {
488 			pr_warn("invalid QP timeout %d > 31\n",
489 				attr->timeout);
490 			goto err1;
491 		}
492 	}
493 
494 	return 0;
495 
496 err1:
497 	return -EINVAL;
498 }
499 
500 /* move the qp to the reset state */
501 static void rxe_qp_reset(struct rxe_qp *qp)
502 {
503 	/* stop tasks from running */
504 	rxe_disable_task(&qp->resp.task);
505 
506 	/* stop request/comp */
507 	if (qp->sq.queue) {
508 		if (qp_type(qp) == IB_QPT_RC)
509 			rxe_disable_task(&qp->comp.task);
510 		rxe_disable_task(&qp->req.task);
511 	}
512 
513 	/* move qp to the reset state */
514 	qp->req.state = QP_STATE_RESET;
515 	qp->resp.state = QP_STATE_RESET;
516 
517 	/* let state machines reset themselves drain work and packet queues
518 	 * etc.
519 	 */
520 	__rxe_do_task(&qp->resp.task);
521 
522 	if (qp->sq.queue) {
523 		__rxe_do_task(&qp->comp.task);
524 		__rxe_do_task(&qp->req.task);
525 	}
526 
527 	/* cleanup attributes */
528 	atomic_set(&qp->ssn, 0);
529 	qp->req.opcode = -1;
530 	qp->req.need_retry = 0;
531 	qp->req.noack_pkts = 0;
532 	qp->resp.msn = 0;
533 	qp->resp.opcode = -1;
534 	qp->resp.drop_msg = 0;
535 	qp->resp.goto_error = 0;
536 	qp->resp.sent_psn_nak = 0;
537 
538 	if (qp->resp.mr) {
539 		rxe_drop_ref(qp->resp.mr);
540 		qp->resp.mr = NULL;
541 	}
542 
543 	cleanup_rd_atomic_resources(qp);
544 
545 	/* reenable tasks */
546 	rxe_enable_task(&qp->resp.task);
547 
548 	if (qp->sq.queue) {
549 		if (qp_type(qp) == IB_QPT_RC)
550 			rxe_enable_task(&qp->comp.task);
551 
552 		rxe_enable_task(&qp->req.task);
553 	}
554 }
555 
556 /* drain the send queue */
557 static void rxe_qp_drain(struct rxe_qp *qp)
558 {
559 	if (qp->sq.queue) {
560 		if (qp->req.state != QP_STATE_DRAINED) {
561 			qp->req.state = QP_STATE_DRAIN;
562 			if (qp_type(qp) == IB_QPT_RC)
563 				rxe_run_task(&qp->comp.task, 1);
564 			else
565 				__rxe_do_task(&qp->comp.task);
566 			rxe_run_task(&qp->req.task, 1);
567 		}
568 	}
569 }
570 
571 /* move the qp to the error state */
572 void rxe_qp_error(struct rxe_qp *qp)
573 {
574 	qp->req.state = QP_STATE_ERROR;
575 	qp->resp.state = QP_STATE_ERROR;
576 
577 	/* drain work and packet queues */
578 	rxe_run_task(&qp->resp.task, 1);
579 
580 	if (qp_type(qp) == IB_QPT_RC)
581 		rxe_run_task(&qp->comp.task, 1);
582 	else
583 		__rxe_do_task(&qp->comp.task);
584 	rxe_run_task(&qp->req.task, 1);
585 }
586 
587 /* called by the modify qp verb */
588 int rxe_qp_from_attr(struct rxe_qp *qp, struct ib_qp_attr *attr, int mask,
589 		     struct ib_udata *udata)
590 {
591 	int err;
592 	struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
593 	union ib_gid sgid;
594 	struct ib_gid_attr sgid_attr;
595 
596 	if (mask & IB_QP_MAX_QP_RD_ATOMIC) {
597 		int max_rd_atomic = __roundup_pow_of_two(attr->max_rd_atomic);
598 
599 		qp->attr.max_rd_atomic = max_rd_atomic;
600 		atomic_set(&qp->req.rd_atomic, max_rd_atomic);
601 	}
602 
603 	if (mask & IB_QP_MAX_DEST_RD_ATOMIC) {
604 		int max_dest_rd_atomic =
605 			__roundup_pow_of_two(attr->max_dest_rd_atomic);
606 
607 		qp->attr.max_dest_rd_atomic = max_dest_rd_atomic;
608 
609 		free_rd_atomic_resources(qp);
610 
611 		err = alloc_rd_atomic_resources(qp, max_dest_rd_atomic);
612 		if (err)
613 			return err;
614 	}
615 
616 	if (mask & IB_QP_CUR_STATE)
617 		qp->attr.cur_qp_state = attr->qp_state;
618 
619 	if (mask & IB_QP_EN_SQD_ASYNC_NOTIFY)
620 		qp->attr.en_sqd_async_notify = attr->en_sqd_async_notify;
621 
622 	if (mask & IB_QP_ACCESS_FLAGS)
623 		qp->attr.qp_access_flags = attr->qp_access_flags;
624 
625 	if (mask & IB_QP_PKEY_INDEX)
626 		qp->attr.pkey_index = attr->pkey_index;
627 
628 	if (mask & IB_QP_PORT)
629 		qp->attr.port_num = attr->port_num;
630 
631 	if (mask & IB_QP_QKEY)
632 		qp->attr.qkey = attr->qkey;
633 
634 	if (mask & IB_QP_AV) {
635 		ib_get_cached_gid(&rxe->ib_dev, 1,
636 				  attr->ah_attr.grh.sgid_index, &sgid,
637 				  &sgid_attr);
638 		rxe_av_from_attr(rxe, attr->port_num, &qp->pri_av,
639 				 &attr->ah_attr);
640 		rxe_av_fill_ip_info(rxe, &qp->pri_av, &attr->ah_attr,
641 				    &sgid_attr, &sgid);
642 		if (sgid_attr.ndev)
643 			dev_put(sgid_attr.ndev);
644 	}
645 
646 	if (mask & IB_QP_ALT_PATH) {
647 		ib_get_cached_gid(&rxe->ib_dev, 1,
648 				  attr->alt_ah_attr.grh.sgid_index, &sgid,
649 				  &sgid_attr);
650 
651 		rxe_av_from_attr(rxe, attr->alt_port_num, &qp->alt_av,
652 				 &attr->alt_ah_attr);
653 		rxe_av_fill_ip_info(rxe, &qp->alt_av, &attr->alt_ah_attr,
654 				    &sgid_attr, &sgid);
655 		if (sgid_attr.ndev)
656 			dev_put(sgid_attr.ndev);
657 
658 		qp->attr.alt_port_num = attr->alt_port_num;
659 		qp->attr.alt_pkey_index = attr->alt_pkey_index;
660 		qp->attr.alt_timeout = attr->alt_timeout;
661 	}
662 
663 	if (mask & IB_QP_PATH_MTU) {
664 		qp->attr.path_mtu = attr->path_mtu;
665 		qp->mtu = ib_mtu_enum_to_int(attr->path_mtu);
666 	}
667 
668 	if (mask & IB_QP_TIMEOUT) {
669 		qp->attr.timeout = attr->timeout;
670 		if (attr->timeout == 0) {
671 			qp->qp_timeout_jiffies = 0;
672 		} else {
673 			/* According to the spec, timeout = 4.096 * 2 ^ attr->timeout [us] */
674 			int j = nsecs_to_jiffies(4096ULL << attr->timeout);
675 
676 			qp->qp_timeout_jiffies = j ? j : 1;
677 		}
678 	}
679 
680 	if (mask & IB_QP_RETRY_CNT) {
681 		qp->attr.retry_cnt = attr->retry_cnt;
682 		qp->comp.retry_cnt = attr->retry_cnt;
683 		pr_debug("qp#%d set retry count = %d\n", qp_num(qp),
684 			 attr->retry_cnt);
685 	}
686 
687 	if (mask & IB_QP_RNR_RETRY) {
688 		qp->attr.rnr_retry = attr->rnr_retry;
689 		qp->comp.rnr_retry = attr->rnr_retry;
690 		pr_debug("qp#%d set rnr retry count = %d\n", qp_num(qp),
691 			 attr->rnr_retry);
692 	}
693 
694 	if (mask & IB_QP_RQ_PSN) {
695 		qp->attr.rq_psn = (attr->rq_psn & BTH_PSN_MASK);
696 		qp->resp.psn = qp->attr.rq_psn;
697 		pr_debug("qp#%d set resp psn = 0x%x\n", qp_num(qp),
698 			 qp->resp.psn);
699 	}
700 
701 	if (mask & IB_QP_MIN_RNR_TIMER) {
702 		qp->attr.min_rnr_timer = attr->min_rnr_timer;
703 		pr_debug("qp#%d set min rnr timer = 0x%x\n", qp_num(qp),
704 			 attr->min_rnr_timer);
705 	}
706 
707 	if (mask & IB_QP_SQ_PSN) {
708 		qp->attr.sq_psn = (attr->sq_psn & BTH_PSN_MASK);
709 		qp->req.psn = qp->attr.sq_psn;
710 		qp->comp.psn = qp->attr.sq_psn;
711 		pr_debug("qp#%d set req psn = 0x%x\n", qp_num(qp), qp->req.psn);
712 	}
713 
714 	if (mask & IB_QP_PATH_MIG_STATE)
715 		qp->attr.path_mig_state = attr->path_mig_state;
716 
717 	if (mask & IB_QP_DEST_QPN)
718 		qp->attr.dest_qp_num = attr->dest_qp_num;
719 
720 	if (mask & IB_QP_STATE) {
721 		qp->attr.qp_state = attr->qp_state;
722 
723 		switch (attr->qp_state) {
724 		case IB_QPS_RESET:
725 			pr_debug("qp#%d state -> RESET\n", qp_num(qp));
726 			rxe_qp_reset(qp);
727 			break;
728 
729 		case IB_QPS_INIT:
730 			pr_debug("qp#%d state -> INIT\n", qp_num(qp));
731 			qp->req.state = QP_STATE_INIT;
732 			qp->resp.state = QP_STATE_INIT;
733 			break;
734 
735 		case IB_QPS_RTR:
736 			pr_debug("qp#%d state -> RTR\n", qp_num(qp));
737 			qp->resp.state = QP_STATE_READY;
738 			break;
739 
740 		case IB_QPS_RTS:
741 			pr_debug("qp#%d state -> RTS\n", qp_num(qp));
742 			qp->req.state = QP_STATE_READY;
743 			break;
744 
745 		case IB_QPS_SQD:
746 			pr_debug("qp#%d state -> SQD\n", qp_num(qp));
747 			rxe_qp_drain(qp);
748 			break;
749 
750 		case IB_QPS_SQE:
751 			pr_warn("qp#%d state -> SQE !!?\n", qp_num(qp));
752 			/* Not possible from modify_qp. */
753 			break;
754 
755 		case IB_QPS_ERR:
756 			pr_debug("qp#%d state -> ERR\n", qp_num(qp));
757 			rxe_qp_error(qp);
758 			break;
759 		}
760 	}
761 
762 	return 0;
763 }
764 
765 /* called by the query qp verb */
766 int rxe_qp_to_attr(struct rxe_qp *qp, struct ib_qp_attr *attr, int mask)
767 {
768 	struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
769 
770 	*attr = qp->attr;
771 
772 	attr->rq_psn				= qp->resp.psn;
773 	attr->sq_psn				= qp->req.psn;
774 
775 	attr->cap.max_send_wr			= qp->sq.max_wr;
776 	attr->cap.max_send_sge			= qp->sq.max_sge;
777 	attr->cap.max_inline_data		= qp->sq.max_inline;
778 
779 	if (!qp->srq) {
780 		attr->cap.max_recv_wr		= qp->rq.max_wr;
781 		attr->cap.max_recv_sge		= qp->rq.max_sge;
782 	}
783 
784 	rxe_av_to_attr(rxe, &qp->pri_av, &attr->ah_attr);
785 	rxe_av_to_attr(rxe, &qp->alt_av, &attr->alt_ah_attr);
786 
787 	if (qp->req.state == QP_STATE_DRAIN) {
788 		attr->sq_draining = 1;
789 		/* applications that get this state
790 		 * typically spin on it. yield the
791 		 * processor
792 		 */
793 		cond_resched();
794 	} else {
795 		attr->sq_draining = 0;
796 	}
797 
798 	pr_debug("attr->sq_draining = %d\n", attr->sq_draining);
799 
800 	return 0;
801 }
802 
803 /* called by the destroy qp verb */
804 void rxe_qp_destroy(struct rxe_qp *qp)
805 {
806 	qp->valid = 0;
807 	qp->qp_timeout_jiffies = 0;
808 	rxe_cleanup_task(&qp->resp.task);
809 
810 	del_timer_sync(&qp->retrans_timer);
811 	del_timer_sync(&qp->rnr_nak_timer);
812 
813 	rxe_cleanup_task(&qp->req.task);
814 	if (qp_type(qp) == IB_QPT_RC)
815 		rxe_cleanup_task(&qp->comp.task);
816 
817 	/* flush out any receive wr's or pending requests */
818 	__rxe_do_task(&qp->req.task);
819 	if (qp->sq.queue) {
820 		__rxe_do_task(&qp->comp.task);
821 		__rxe_do_task(&qp->req.task);
822 	}
823 }
824 
825 /* called when the last reference to the qp is dropped */
826 void rxe_qp_cleanup(void *arg)
827 {
828 	struct rxe_qp *qp = arg;
829 
830 	rxe_drop_all_mcast_groups(qp);
831 
832 	if (qp->sq.queue)
833 		rxe_queue_cleanup(qp->sq.queue);
834 
835 	if (qp->srq)
836 		rxe_drop_ref(qp->srq);
837 
838 	if (qp->rq.queue)
839 		rxe_queue_cleanup(qp->rq.queue);
840 
841 	if (qp->scq)
842 		rxe_drop_ref(qp->scq);
843 	if (qp->rcq)
844 		rxe_drop_ref(qp->rcq);
845 	if (qp->pd)
846 		rxe_drop_ref(qp->pd);
847 
848 	if (qp->resp.mr) {
849 		rxe_drop_ref(qp->resp.mr);
850 		qp->resp.mr = NULL;
851 	}
852 
853 	free_rd_atomic_resources(qp);
854 
855 	kernel_sock_shutdown(qp->sk, SHUT_RDWR);
856 }
857