1 /*
2  * Copyright (c) 2012-2016 VMware, Inc.  All rights reserved.
3  *
4  * This program is free software; you can redistribute it and/or
5  * modify it under the terms of EITHER the GNU General Public License
6  * version 2 as published by the Free Software Foundation or the BSD
7  * 2-Clause License. This program is distributed in the hope that it
8  * will be useful, but WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED
9  * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
10  * See the GNU General Public License version 2 for more details at
11  * http://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html.
12  *
13  * You should have received a copy of the GNU General Public License
14  * along with this program available in the file COPYING in the main
15  * directory of this source tree.
16  *
17  * The BSD 2-Clause License
18  *
19  *     Redistribution and use in source and binary forms, with or
20  *     without modification, are permitted provided that the following
21  *     conditions are met:
22  *
23  *      - Redistributions of source code must retain the above
24  *        copyright notice, this list of conditions and the following
25  *        disclaimer.
26  *
27  *      - Redistributions in binary form must reproduce the above
28  *        copyright notice, this list of conditions and the following
29  *        disclaimer in the documentation and/or other materials
30  *        provided with the distribution.
31  *
32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
33  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
35  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
36  * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
37  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
38  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
39  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
40  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
41  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
42  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
43  * OF THE POSSIBILITY OF SUCH DAMAGE.
44  */
45 
46 #include <asm/page.h>
47 #include <linux/io.h>
48 #include <linux/wait.h>
49 #include <rdma/ib_addr.h>
50 #include <rdma/ib_smi.h>
51 #include <rdma/ib_user_verbs.h>
52 
53 #include "pvrdma.h"
54 
55 static inline void get_cqs(struct pvrdma_qp *qp, struct pvrdma_cq **send_cq,
56 			   struct pvrdma_cq **recv_cq)
57 {
58 	*send_cq = to_vcq(qp->ibqp.send_cq);
59 	*recv_cq = to_vcq(qp->ibqp.recv_cq);
60 }
61 
62 static void pvrdma_lock_cqs(struct pvrdma_cq *scq, struct pvrdma_cq *rcq,
63 			    unsigned long *scq_flags,
64 			    unsigned long *rcq_flags)
65 	__acquires(scq->cq_lock) __acquires(rcq->cq_lock)
66 {
67 	if (scq == rcq) {
68 		spin_lock_irqsave(&scq->cq_lock, *scq_flags);
69 		__acquire(rcq->cq_lock);
70 	} else if (scq->cq_handle < rcq->cq_handle) {
71 		spin_lock_irqsave(&scq->cq_lock, *scq_flags);
72 		spin_lock_irqsave_nested(&rcq->cq_lock, *rcq_flags,
73 					 SINGLE_DEPTH_NESTING);
74 	} else {
75 		spin_lock_irqsave(&rcq->cq_lock, *rcq_flags);
76 		spin_lock_irqsave_nested(&scq->cq_lock, *scq_flags,
77 					 SINGLE_DEPTH_NESTING);
78 	}
79 }
80 
81 static void pvrdma_unlock_cqs(struct pvrdma_cq *scq, struct pvrdma_cq *rcq,
82 			      unsigned long *scq_flags,
83 			      unsigned long *rcq_flags)
84 	__releases(scq->cq_lock) __releases(rcq->cq_lock)
85 {
86 	if (scq == rcq) {
87 		__release(rcq->cq_lock);
88 		spin_unlock_irqrestore(&scq->cq_lock, *scq_flags);
89 	} else if (scq->cq_handle < rcq->cq_handle) {
90 		spin_unlock_irqrestore(&rcq->cq_lock, *rcq_flags);
91 		spin_unlock_irqrestore(&scq->cq_lock, *scq_flags);
92 	} else {
93 		spin_unlock_irqrestore(&scq->cq_lock, *scq_flags);
94 		spin_unlock_irqrestore(&rcq->cq_lock, *rcq_flags);
95 	}
96 }
97 
98 static void pvrdma_reset_qp(struct pvrdma_qp *qp)
99 {
100 	struct pvrdma_cq *scq, *rcq;
101 	unsigned long scq_flags, rcq_flags;
102 
103 	/* Clean up cqes */
104 	get_cqs(qp, &scq, &rcq);
105 	pvrdma_lock_cqs(scq, rcq, &scq_flags, &rcq_flags);
106 
107 	_pvrdma_flush_cqe(qp, scq);
108 	if (scq != rcq)
109 		_pvrdma_flush_cqe(qp, rcq);
110 
111 	pvrdma_unlock_cqs(scq, rcq, &scq_flags, &rcq_flags);
112 
113 	/*
114 	 * Reset queuepair. The checks are because usermode queuepairs won't
115 	 * have kernel ringstates.
116 	 */
117 	if (qp->rq.ring) {
118 		atomic_set(&qp->rq.ring->cons_head, 0);
119 		atomic_set(&qp->rq.ring->prod_tail, 0);
120 	}
121 	if (qp->sq.ring) {
122 		atomic_set(&qp->sq.ring->cons_head, 0);
123 		atomic_set(&qp->sq.ring->prod_tail, 0);
124 	}
125 }
126 
127 static int pvrdma_set_rq_size(struct pvrdma_dev *dev,
128 			      struct ib_qp_cap *req_cap,
129 			      struct pvrdma_qp *qp)
130 {
131 	if (req_cap->max_recv_wr > dev->dsr->caps.max_qp_wr ||
132 	    req_cap->max_recv_sge > dev->dsr->caps.max_sge) {
133 		dev_warn(&dev->pdev->dev, "recv queue size invalid\n");
134 		return -EINVAL;
135 	}
136 
137 	qp->rq.wqe_cnt = roundup_pow_of_two(max(1U, req_cap->max_recv_wr));
138 	qp->rq.max_sg = roundup_pow_of_two(max(1U, req_cap->max_recv_sge));
139 
140 	/* Write back */
141 	req_cap->max_recv_wr = qp->rq.wqe_cnt;
142 	req_cap->max_recv_sge = qp->rq.max_sg;
143 
144 	qp->rq.wqe_size = roundup_pow_of_two(sizeof(struct pvrdma_rq_wqe_hdr) +
145 					     sizeof(struct pvrdma_sge) *
146 					     qp->rq.max_sg);
147 	qp->npages_recv = (qp->rq.wqe_cnt * qp->rq.wqe_size + PAGE_SIZE - 1) /
148 			  PAGE_SIZE;
149 
150 	return 0;
151 }
152 
153 static int pvrdma_set_sq_size(struct pvrdma_dev *dev, struct ib_qp_cap *req_cap,
154 			      struct pvrdma_qp *qp)
155 {
156 	if (req_cap->max_send_wr > dev->dsr->caps.max_qp_wr ||
157 	    req_cap->max_send_sge > dev->dsr->caps.max_sge) {
158 		dev_warn(&dev->pdev->dev, "send queue size invalid\n");
159 		return -EINVAL;
160 	}
161 
162 	qp->sq.wqe_cnt = roundup_pow_of_two(max(1U, req_cap->max_send_wr));
163 	qp->sq.max_sg = roundup_pow_of_two(max(1U, req_cap->max_send_sge));
164 
165 	/* Write back */
166 	req_cap->max_send_wr = qp->sq.wqe_cnt;
167 	req_cap->max_send_sge = qp->sq.max_sg;
168 
169 	qp->sq.wqe_size = roundup_pow_of_two(sizeof(struct pvrdma_sq_wqe_hdr) +
170 					     sizeof(struct pvrdma_sge) *
171 					     qp->sq.max_sg);
172 	/* Note: one extra page for the header. */
173 	qp->npages_send = PVRDMA_QP_NUM_HEADER_PAGES +
174 			  (qp->sq.wqe_cnt * qp->sq.wqe_size + PAGE_SIZE - 1) /
175 								PAGE_SIZE;
176 
177 	return 0;
178 }
179 
180 /**
181  * pvrdma_create_qp - create queue pair
182  * @pd: protection domain
183  * @init_attr: queue pair attributes
184  * @udata: user data
185  *
186  * @return: the ib_qp pointer on success, otherwise returns an errno.
187  */
188 struct ib_qp *pvrdma_create_qp(struct ib_pd *pd,
189 			       struct ib_qp_init_attr *init_attr,
190 			       struct ib_udata *udata)
191 {
192 	struct pvrdma_qp *qp = NULL;
193 	struct pvrdma_dev *dev = to_vdev(pd->device);
194 	union pvrdma_cmd_req req;
195 	union pvrdma_cmd_resp rsp;
196 	struct pvrdma_cmd_create_qp *cmd = &req.create_qp;
197 	struct pvrdma_cmd_create_qp_resp *resp = &rsp.create_qp_resp;
198 	struct pvrdma_create_qp ucmd;
199 	unsigned long flags;
200 	int ret;
201 	bool is_srq = !!init_attr->srq;
202 
203 	if (init_attr->create_flags) {
204 		dev_warn(&dev->pdev->dev,
205 			 "invalid create queuepair flags %#x\n",
206 			 init_attr->create_flags);
207 		return ERR_PTR(-EINVAL);
208 	}
209 
210 	if (init_attr->qp_type != IB_QPT_RC &&
211 	    init_attr->qp_type != IB_QPT_UD &&
212 	    init_attr->qp_type != IB_QPT_GSI) {
213 		dev_warn(&dev->pdev->dev, "queuepair type %d not supported\n",
214 			 init_attr->qp_type);
215 		return ERR_PTR(-EINVAL);
216 	}
217 
218 	if (is_srq && !dev->dsr->caps.max_srq) {
219 		dev_warn(&dev->pdev->dev,
220 			 "SRQs not supported by device\n");
221 		return ERR_PTR(-EINVAL);
222 	}
223 
224 	if (!atomic_add_unless(&dev->num_qps, 1, dev->dsr->caps.max_qp))
225 		return ERR_PTR(-ENOMEM);
226 
227 	switch (init_attr->qp_type) {
228 	case IB_QPT_GSI:
229 		if (init_attr->port_num == 0 ||
230 		    init_attr->port_num > pd->device->phys_port_cnt ||
231 		    udata) {
232 			dev_warn(&dev->pdev->dev, "invalid queuepair attrs\n");
233 			ret = -EINVAL;
234 			goto err_qp;
235 		}
236 		/* fall through */
237 	case IB_QPT_RC:
238 	case IB_QPT_UD:
239 		qp = kzalloc(sizeof(*qp), GFP_KERNEL);
240 		if (!qp) {
241 			ret = -ENOMEM;
242 			goto err_qp;
243 		}
244 
245 		spin_lock_init(&qp->sq.lock);
246 		spin_lock_init(&qp->rq.lock);
247 		mutex_init(&qp->mutex);
248 		refcount_set(&qp->refcnt, 1);
249 		init_completion(&qp->free);
250 
251 		qp->state = IB_QPS_RESET;
252 		qp->is_kernel = !(pd->uobject && udata);
253 
254 		if (!qp->is_kernel) {
255 			dev_dbg(&dev->pdev->dev,
256 				"create queuepair from user space\n");
257 
258 			if (ib_copy_from_udata(&ucmd, udata, sizeof(ucmd))) {
259 				ret = -EFAULT;
260 				goto err_qp;
261 			}
262 
263 			if (!is_srq) {
264 				/* set qp->sq.wqe_cnt, shift, buf_size.. */
265 				qp->rumem = ib_umem_get(pd->uobject->context,
266 							ucmd.rbuf_addr,
267 							ucmd.rbuf_size, 0, 0);
268 				if (IS_ERR(qp->rumem)) {
269 					ret = PTR_ERR(qp->rumem);
270 					goto err_qp;
271 				}
272 				qp->srq = NULL;
273 			} else {
274 				qp->rumem = NULL;
275 				qp->srq = to_vsrq(init_attr->srq);
276 			}
277 
278 			qp->sumem = ib_umem_get(pd->uobject->context,
279 						ucmd.sbuf_addr,
280 						ucmd.sbuf_size, 0, 0);
281 			if (IS_ERR(qp->sumem)) {
282 				if (!is_srq)
283 					ib_umem_release(qp->rumem);
284 				ret = PTR_ERR(qp->sumem);
285 				goto err_qp;
286 			}
287 
288 			qp->npages_send = ib_umem_page_count(qp->sumem);
289 			if (!is_srq)
290 				qp->npages_recv = ib_umem_page_count(qp->rumem);
291 			else
292 				qp->npages_recv = 0;
293 			qp->npages = qp->npages_send + qp->npages_recv;
294 		} else {
295 			ret = pvrdma_set_sq_size(to_vdev(pd->device),
296 						 &init_attr->cap, qp);
297 			if (ret)
298 				goto err_qp;
299 
300 			ret = pvrdma_set_rq_size(to_vdev(pd->device),
301 						 &init_attr->cap, qp);
302 			if (ret)
303 				goto err_qp;
304 
305 			qp->npages = qp->npages_send + qp->npages_recv;
306 
307 			/* Skip header page. */
308 			qp->sq.offset = PVRDMA_QP_NUM_HEADER_PAGES * PAGE_SIZE;
309 
310 			/* Recv queue pages are after send pages. */
311 			qp->rq.offset = qp->npages_send * PAGE_SIZE;
312 		}
313 
314 		if (qp->npages < 0 || qp->npages > PVRDMA_PAGE_DIR_MAX_PAGES) {
315 			dev_warn(&dev->pdev->dev,
316 				 "overflow pages in queuepair\n");
317 			ret = -EINVAL;
318 			goto err_umem;
319 		}
320 
321 		ret = pvrdma_page_dir_init(dev, &qp->pdir, qp->npages,
322 					   qp->is_kernel);
323 		if (ret) {
324 			dev_warn(&dev->pdev->dev,
325 				 "could not allocate page directory\n");
326 			goto err_umem;
327 		}
328 
329 		if (!qp->is_kernel) {
330 			pvrdma_page_dir_insert_umem(&qp->pdir, qp->sumem, 0);
331 			if (!is_srq)
332 				pvrdma_page_dir_insert_umem(&qp->pdir,
333 							    qp->rumem,
334 							    qp->npages_send);
335 		} else {
336 			/* Ring state is always the first page. */
337 			qp->sq.ring = qp->pdir.pages[0];
338 			qp->rq.ring = is_srq ? NULL : &qp->sq.ring[1];
339 		}
340 		break;
341 	default:
342 		ret = -EINVAL;
343 		goto err_qp;
344 	}
345 
346 	/* Not supported */
347 	init_attr->cap.max_inline_data = 0;
348 
349 	memset(cmd, 0, sizeof(*cmd));
350 	cmd->hdr.cmd = PVRDMA_CMD_CREATE_QP;
351 	cmd->pd_handle = to_vpd(pd)->pd_handle;
352 	cmd->send_cq_handle = to_vcq(init_attr->send_cq)->cq_handle;
353 	cmd->recv_cq_handle = to_vcq(init_attr->recv_cq)->cq_handle;
354 	if (is_srq)
355 		cmd->srq_handle = to_vsrq(init_attr->srq)->srq_handle;
356 	else
357 		cmd->srq_handle = 0;
358 	cmd->max_send_wr = init_attr->cap.max_send_wr;
359 	cmd->max_recv_wr = init_attr->cap.max_recv_wr;
360 	cmd->max_send_sge = init_attr->cap.max_send_sge;
361 	cmd->max_recv_sge = init_attr->cap.max_recv_sge;
362 	cmd->max_inline_data = init_attr->cap.max_inline_data;
363 	cmd->sq_sig_all = (init_attr->sq_sig_type == IB_SIGNAL_ALL_WR) ? 1 : 0;
364 	cmd->qp_type = ib_qp_type_to_pvrdma(init_attr->qp_type);
365 	cmd->is_srq = is_srq;
366 	cmd->lkey = 0;
367 	cmd->access_flags = IB_ACCESS_LOCAL_WRITE;
368 	cmd->total_chunks = qp->npages;
369 	cmd->send_chunks = qp->npages_send - PVRDMA_QP_NUM_HEADER_PAGES;
370 	cmd->pdir_dma = qp->pdir.dir_dma;
371 
372 	dev_dbg(&dev->pdev->dev, "create queuepair with %d, %d, %d, %d\n",
373 		cmd->max_send_wr, cmd->max_recv_wr, cmd->max_send_sge,
374 		cmd->max_recv_sge);
375 
376 	ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_QP_RESP);
377 	if (ret < 0) {
378 		dev_warn(&dev->pdev->dev,
379 			 "could not create queuepair, error: %d\n", ret);
380 		goto err_pdir;
381 	}
382 
383 	/* max_send_wr/_recv_wr/_send_sge/_recv_sge/_inline_data */
384 	qp->qp_handle = resp->qpn;
385 	qp->port = init_attr->port_num;
386 	qp->ibqp.qp_num = resp->qpn;
387 	spin_lock_irqsave(&dev->qp_tbl_lock, flags);
388 	dev->qp_tbl[qp->qp_handle % dev->dsr->caps.max_qp] = qp;
389 	spin_unlock_irqrestore(&dev->qp_tbl_lock, flags);
390 
391 	return &qp->ibqp;
392 
393 err_pdir:
394 	pvrdma_page_dir_cleanup(dev, &qp->pdir);
395 err_umem:
396 	if (!qp->is_kernel) {
397 		if (qp->rumem)
398 			ib_umem_release(qp->rumem);
399 		if (qp->sumem)
400 			ib_umem_release(qp->sumem);
401 	}
402 err_qp:
403 	kfree(qp);
404 	atomic_dec(&dev->num_qps);
405 
406 	return ERR_PTR(ret);
407 }
408 
409 static void pvrdma_free_qp(struct pvrdma_qp *qp)
410 {
411 	struct pvrdma_dev *dev = to_vdev(qp->ibqp.device);
412 	struct pvrdma_cq *scq;
413 	struct pvrdma_cq *rcq;
414 	unsigned long flags, scq_flags, rcq_flags;
415 
416 	/* In case cq is polling */
417 	get_cqs(qp, &scq, &rcq);
418 	pvrdma_lock_cqs(scq, rcq, &scq_flags, &rcq_flags);
419 
420 	_pvrdma_flush_cqe(qp, scq);
421 	if (scq != rcq)
422 		_pvrdma_flush_cqe(qp, rcq);
423 
424 	spin_lock_irqsave(&dev->qp_tbl_lock, flags);
425 	dev->qp_tbl[qp->qp_handle] = NULL;
426 	spin_unlock_irqrestore(&dev->qp_tbl_lock, flags);
427 
428 	pvrdma_unlock_cqs(scq, rcq, &scq_flags, &rcq_flags);
429 
430 	if (refcount_dec_and_test(&qp->refcnt))
431 		complete(&qp->free);
432 	wait_for_completion(&qp->free);
433 
434 	if (!qp->is_kernel) {
435 		if (qp->rumem)
436 			ib_umem_release(qp->rumem);
437 		if (qp->sumem)
438 			ib_umem_release(qp->sumem);
439 	}
440 
441 	pvrdma_page_dir_cleanup(dev, &qp->pdir);
442 
443 	kfree(qp);
444 
445 	atomic_dec(&dev->num_qps);
446 }
447 
448 /**
449  * pvrdma_destroy_qp - destroy a queue pair
450  * @qp: the queue pair to destroy
451  *
452  * @return: 0 on success.
453  */
454 int pvrdma_destroy_qp(struct ib_qp *qp)
455 {
456 	struct pvrdma_qp *vqp = to_vqp(qp);
457 	union pvrdma_cmd_req req;
458 	struct pvrdma_cmd_destroy_qp *cmd = &req.destroy_qp;
459 	int ret;
460 
461 	memset(cmd, 0, sizeof(*cmd));
462 	cmd->hdr.cmd = PVRDMA_CMD_DESTROY_QP;
463 	cmd->qp_handle = vqp->qp_handle;
464 
465 	ret = pvrdma_cmd_post(to_vdev(qp->device), &req, NULL, 0);
466 	if (ret < 0)
467 		dev_warn(&to_vdev(qp->device)->pdev->dev,
468 			 "destroy queuepair failed, error: %d\n", ret);
469 
470 	pvrdma_free_qp(vqp);
471 
472 	return 0;
473 }
474 
475 /**
476  * pvrdma_modify_qp - modify queue pair attributes
477  * @ibqp: the queue pair
478  * @attr: the new queue pair's attributes
479  * @attr_mask: attributes mask
480  * @udata: user data
481  *
482  * @returns 0 on success, otherwise returns an errno.
483  */
484 int pvrdma_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
485 		     int attr_mask, struct ib_udata *udata)
486 {
487 	struct pvrdma_dev *dev = to_vdev(ibqp->device);
488 	struct pvrdma_qp *qp = to_vqp(ibqp);
489 	union pvrdma_cmd_req req;
490 	union pvrdma_cmd_resp rsp;
491 	struct pvrdma_cmd_modify_qp *cmd = &req.modify_qp;
492 	enum ib_qp_state cur_state, next_state;
493 	int ret;
494 
495 	/* Sanity checking. Should need lock here */
496 	mutex_lock(&qp->mutex);
497 	cur_state = (attr_mask & IB_QP_CUR_STATE) ? attr->cur_qp_state :
498 		qp->state;
499 	next_state = (attr_mask & IB_QP_STATE) ? attr->qp_state : cur_state;
500 
501 	if (!ib_modify_qp_is_ok(cur_state, next_state, ibqp->qp_type,
502 				attr_mask, IB_LINK_LAYER_ETHERNET)) {
503 		ret = -EINVAL;
504 		goto out;
505 	}
506 
507 	if (attr_mask & IB_QP_PORT) {
508 		if (attr->port_num == 0 ||
509 		    attr->port_num > ibqp->device->phys_port_cnt) {
510 			ret = -EINVAL;
511 			goto out;
512 		}
513 	}
514 
515 	if (attr_mask & IB_QP_MIN_RNR_TIMER) {
516 		if (attr->min_rnr_timer > 31) {
517 			ret = -EINVAL;
518 			goto out;
519 		}
520 	}
521 
522 	if (attr_mask & IB_QP_PKEY_INDEX) {
523 		if (attr->pkey_index >= dev->dsr->caps.max_pkeys) {
524 			ret = -EINVAL;
525 			goto out;
526 		}
527 	}
528 
529 	if (attr_mask & IB_QP_QKEY)
530 		qp->qkey = attr->qkey;
531 
532 	if (cur_state == next_state && cur_state == IB_QPS_RESET) {
533 		ret = 0;
534 		goto out;
535 	}
536 
537 	qp->state = next_state;
538 	memset(cmd, 0, sizeof(*cmd));
539 	cmd->hdr.cmd = PVRDMA_CMD_MODIFY_QP;
540 	cmd->qp_handle = qp->qp_handle;
541 	cmd->attr_mask = ib_qp_attr_mask_to_pvrdma(attr_mask);
542 	cmd->attrs.qp_state = ib_qp_state_to_pvrdma(attr->qp_state);
543 	cmd->attrs.cur_qp_state =
544 		ib_qp_state_to_pvrdma(attr->cur_qp_state);
545 	cmd->attrs.path_mtu = ib_mtu_to_pvrdma(attr->path_mtu);
546 	cmd->attrs.path_mig_state =
547 		ib_mig_state_to_pvrdma(attr->path_mig_state);
548 	cmd->attrs.qkey = attr->qkey;
549 	cmd->attrs.rq_psn = attr->rq_psn;
550 	cmd->attrs.sq_psn = attr->sq_psn;
551 	cmd->attrs.dest_qp_num = attr->dest_qp_num;
552 	cmd->attrs.qp_access_flags =
553 		ib_access_flags_to_pvrdma(attr->qp_access_flags);
554 	cmd->attrs.pkey_index = attr->pkey_index;
555 	cmd->attrs.alt_pkey_index = attr->alt_pkey_index;
556 	cmd->attrs.en_sqd_async_notify = attr->en_sqd_async_notify;
557 	cmd->attrs.sq_draining = attr->sq_draining;
558 	cmd->attrs.max_rd_atomic = attr->max_rd_atomic;
559 	cmd->attrs.max_dest_rd_atomic = attr->max_dest_rd_atomic;
560 	cmd->attrs.min_rnr_timer = attr->min_rnr_timer;
561 	cmd->attrs.port_num = attr->port_num;
562 	cmd->attrs.timeout = attr->timeout;
563 	cmd->attrs.retry_cnt = attr->retry_cnt;
564 	cmd->attrs.rnr_retry = attr->rnr_retry;
565 	cmd->attrs.alt_port_num = attr->alt_port_num;
566 	cmd->attrs.alt_timeout = attr->alt_timeout;
567 	ib_qp_cap_to_pvrdma(&cmd->attrs.cap, &attr->cap);
568 	rdma_ah_attr_to_pvrdma(&cmd->attrs.ah_attr, &attr->ah_attr);
569 	rdma_ah_attr_to_pvrdma(&cmd->attrs.alt_ah_attr, &attr->alt_ah_attr);
570 
571 	ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_MODIFY_QP_RESP);
572 	if (ret < 0) {
573 		dev_warn(&dev->pdev->dev,
574 			 "could not modify queuepair, error: %d\n", ret);
575 	} else if (rsp.hdr.err > 0) {
576 		dev_warn(&dev->pdev->dev,
577 			 "cannot modify queuepair, error: %d\n", rsp.hdr.err);
578 		ret = -EINVAL;
579 	}
580 
581 	if (ret == 0 && next_state == IB_QPS_RESET)
582 		pvrdma_reset_qp(qp);
583 
584 out:
585 	mutex_unlock(&qp->mutex);
586 
587 	return ret;
588 }
589 
590 static inline void *get_sq_wqe(struct pvrdma_qp *qp, unsigned int n)
591 {
592 	return pvrdma_page_dir_get_ptr(&qp->pdir,
593 				       qp->sq.offset + n * qp->sq.wqe_size);
594 }
595 
596 static inline void *get_rq_wqe(struct pvrdma_qp *qp, unsigned int n)
597 {
598 	return pvrdma_page_dir_get_ptr(&qp->pdir,
599 				       qp->rq.offset + n * qp->rq.wqe_size);
600 }
601 
602 static int set_reg_seg(struct pvrdma_sq_wqe_hdr *wqe_hdr,
603 		       const struct ib_reg_wr *wr)
604 {
605 	struct pvrdma_user_mr *mr = to_vmr(wr->mr);
606 
607 	wqe_hdr->wr.fast_reg.iova_start = mr->ibmr.iova;
608 	wqe_hdr->wr.fast_reg.pl_pdir_dma = mr->pdir.dir_dma;
609 	wqe_hdr->wr.fast_reg.page_shift = mr->page_shift;
610 	wqe_hdr->wr.fast_reg.page_list_len = mr->npages;
611 	wqe_hdr->wr.fast_reg.length = mr->ibmr.length;
612 	wqe_hdr->wr.fast_reg.access_flags = wr->access;
613 	wqe_hdr->wr.fast_reg.rkey = wr->key;
614 
615 	return pvrdma_page_dir_insert_page_list(&mr->pdir, mr->pages,
616 						mr->npages);
617 }
618 
619 /**
620  * pvrdma_post_send - post send work request entries on a QP
621  * @ibqp: the QP
622  * @wr: work request list to post
623  * @bad_wr: the first bad WR returned
624  *
625  * @return: 0 on success, otherwise errno returned.
626  */
627 int pvrdma_post_send(struct ib_qp *ibqp, const struct ib_send_wr *wr,
628 		     const struct ib_send_wr **bad_wr)
629 {
630 	struct pvrdma_qp *qp = to_vqp(ibqp);
631 	struct pvrdma_dev *dev = to_vdev(ibqp->device);
632 	unsigned long flags;
633 	struct pvrdma_sq_wqe_hdr *wqe_hdr;
634 	struct pvrdma_sge *sge;
635 	int i, ret;
636 
637 	/*
638 	 * In states lower than RTS, we can fail immediately. In other states,
639 	 * just post and let the device figure it out.
640 	 */
641 	if (qp->state < IB_QPS_RTS) {
642 		*bad_wr = wr;
643 		return -EINVAL;
644 	}
645 
646 	spin_lock_irqsave(&qp->sq.lock, flags);
647 
648 	while (wr) {
649 		unsigned int tail = 0;
650 
651 		if (unlikely(!pvrdma_idx_ring_has_space(
652 				qp->sq.ring, qp->sq.wqe_cnt, &tail))) {
653 			dev_warn_ratelimited(&dev->pdev->dev,
654 					     "send queue is full\n");
655 			*bad_wr = wr;
656 			ret = -ENOMEM;
657 			goto out;
658 		}
659 
660 		if (unlikely(wr->num_sge > qp->sq.max_sg || wr->num_sge < 0)) {
661 			dev_warn_ratelimited(&dev->pdev->dev,
662 					     "send SGE overflow\n");
663 			*bad_wr = wr;
664 			ret = -EINVAL;
665 			goto out;
666 		}
667 
668 		if (unlikely(wr->opcode < 0)) {
669 			dev_warn_ratelimited(&dev->pdev->dev,
670 					     "invalid send opcode\n");
671 			*bad_wr = wr;
672 			ret = -EINVAL;
673 			goto out;
674 		}
675 
676 		/*
677 		 * Only support UD, RC.
678 		 * Need to check opcode table for thorough checking.
679 		 * opcode		_UD	_UC	_RC
680 		 * _SEND		x	x	x
681 		 * _SEND_WITH_IMM	x	x	x
682 		 * _RDMA_WRITE			x	x
683 		 * _RDMA_WRITE_WITH_IMM		x	x
684 		 * _LOCAL_INV			x	x
685 		 * _SEND_WITH_INV		x	x
686 		 * _RDMA_READ				x
687 		 * _ATOMIC_CMP_AND_SWP			x
688 		 * _ATOMIC_FETCH_AND_ADD		x
689 		 * _MASK_ATOMIC_CMP_AND_SWP		x
690 		 * _MASK_ATOMIC_FETCH_AND_ADD		x
691 		 * _REG_MR				x
692 		 *
693 		 */
694 		if (qp->ibqp.qp_type != IB_QPT_UD &&
695 		    qp->ibqp.qp_type != IB_QPT_RC &&
696 			wr->opcode != IB_WR_SEND) {
697 			dev_warn_ratelimited(&dev->pdev->dev,
698 					     "unsupported queuepair type\n");
699 			*bad_wr = wr;
700 			ret = -EINVAL;
701 			goto out;
702 		} else if (qp->ibqp.qp_type == IB_QPT_UD ||
703 			   qp->ibqp.qp_type == IB_QPT_GSI) {
704 			if (wr->opcode != IB_WR_SEND &&
705 			    wr->opcode != IB_WR_SEND_WITH_IMM) {
706 				dev_warn_ratelimited(&dev->pdev->dev,
707 						     "invalid send opcode\n");
708 				*bad_wr = wr;
709 				ret = -EINVAL;
710 				goto out;
711 			}
712 		}
713 
714 		wqe_hdr = (struct pvrdma_sq_wqe_hdr *)get_sq_wqe(qp, tail);
715 		memset(wqe_hdr, 0, sizeof(*wqe_hdr));
716 		wqe_hdr->wr_id = wr->wr_id;
717 		wqe_hdr->num_sge = wr->num_sge;
718 		wqe_hdr->opcode = ib_wr_opcode_to_pvrdma(wr->opcode);
719 		wqe_hdr->send_flags = ib_send_flags_to_pvrdma(wr->send_flags);
720 		if (wr->opcode == IB_WR_SEND_WITH_IMM ||
721 		    wr->opcode == IB_WR_RDMA_WRITE_WITH_IMM)
722 			wqe_hdr->ex.imm_data = wr->ex.imm_data;
723 
724 		switch (qp->ibqp.qp_type) {
725 		case IB_QPT_GSI:
726 		case IB_QPT_UD:
727 			if (unlikely(!ud_wr(wr)->ah)) {
728 				dev_warn_ratelimited(&dev->pdev->dev,
729 						     "invalid address handle\n");
730 				*bad_wr = wr;
731 				ret = -EINVAL;
732 				goto out;
733 			}
734 
735 			/*
736 			 * Use qkey from qp context if high order bit set,
737 			 * otherwise from work request.
738 			 */
739 			wqe_hdr->wr.ud.remote_qpn = ud_wr(wr)->remote_qpn;
740 			wqe_hdr->wr.ud.remote_qkey =
741 				ud_wr(wr)->remote_qkey & 0x80000000 ?
742 				qp->qkey : ud_wr(wr)->remote_qkey;
743 			wqe_hdr->wr.ud.av = to_vah(ud_wr(wr)->ah)->av;
744 
745 			break;
746 		case IB_QPT_RC:
747 			switch (wr->opcode) {
748 			case IB_WR_RDMA_READ:
749 			case IB_WR_RDMA_WRITE:
750 			case IB_WR_RDMA_WRITE_WITH_IMM:
751 				wqe_hdr->wr.rdma.remote_addr =
752 					rdma_wr(wr)->remote_addr;
753 				wqe_hdr->wr.rdma.rkey = rdma_wr(wr)->rkey;
754 				break;
755 			case IB_WR_LOCAL_INV:
756 			case IB_WR_SEND_WITH_INV:
757 				wqe_hdr->ex.invalidate_rkey =
758 					wr->ex.invalidate_rkey;
759 				break;
760 			case IB_WR_ATOMIC_CMP_AND_SWP:
761 			case IB_WR_ATOMIC_FETCH_AND_ADD:
762 				wqe_hdr->wr.atomic.remote_addr =
763 					atomic_wr(wr)->remote_addr;
764 				wqe_hdr->wr.atomic.rkey = atomic_wr(wr)->rkey;
765 				wqe_hdr->wr.atomic.compare_add =
766 					atomic_wr(wr)->compare_add;
767 				if (wr->opcode == IB_WR_ATOMIC_CMP_AND_SWP)
768 					wqe_hdr->wr.atomic.swap =
769 						atomic_wr(wr)->swap;
770 				break;
771 			case IB_WR_REG_MR:
772 				ret = set_reg_seg(wqe_hdr, reg_wr(wr));
773 				if (ret < 0) {
774 					dev_warn_ratelimited(&dev->pdev->dev,
775 							     "Failed to set fast register work request\n");
776 					*bad_wr = wr;
777 					goto out;
778 				}
779 				break;
780 			default:
781 				break;
782 			}
783 
784 			break;
785 		default:
786 			dev_warn_ratelimited(&dev->pdev->dev,
787 					     "invalid queuepair type\n");
788 			ret = -EINVAL;
789 			*bad_wr = wr;
790 			goto out;
791 		}
792 
793 		sge = (struct pvrdma_sge *)(wqe_hdr + 1);
794 		for (i = 0; i < wr->num_sge; i++) {
795 			/* Need to check wqe_size 0 or max size */
796 			sge->addr = wr->sg_list[i].addr;
797 			sge->length = wr->sg_list[i].length;
798 			sge->lkey = wr->sg_list[i].lkey;
799 			sge++;
800 		}
801 
802 		/* Make sure wqe is written before index update */
803 		smp_wmb();
804 
805 		/* Update shared sq ring */
806 		pvrdma_idx_ring_inc(&qp->sq.ring->prod_tail,
807 				    qp->sq.wqe_cnt);
808 
809 		wr = wr->next;
810 	}
811 
812 	ret = 0;
813 
814 out:
815 	spin_unlock_irqrestore(&qp->sq.lock, flags);
816 
817 	if (!ret)
818 		pvrdma_write_uar_qp(dev, PVRDMA_UAR_QP_SEND | qp->qp_handle);
819 
820 	return ret;
821 }
822 
823 /**
824  * pvrdma_post_receive - post receive work request entries on a QP
825  * @ibqp: the QP
826  * @wr: the work request list to post
827  * @bad_wr: the first bad WR returned
828  *
829  * @return: 0 on success, otherwise errno returned.
830  */
831 int pvrdma_post_recv(struct ib_qp *ibqp, const struct ib_recv_wr *wr,
832 		     const struct ib_recv_wr **bad_wr)
833 {
834 	struct pvrdma_dev *dev = to_vdev(ibqp->device);
835 	unsigned long flags;
836 	struct pvrdma_qp *qp = to_vqp(ibqp);
837 	struct pvrdma_rq_wqe_hdr *wqe_hdr;
838 	struct pvrdma_sge *sge;
839 	int ret = 0;
840 	int i;
841 
842 	/*
843 	 * In the RESET state, we can fail immediately. For other states,
844 	 * just post and let the device figure it out.
845 	 */
846 	if (qp->state == IB_QPS_RESET) {
847 		*bad_wr = wr;
848 		return -EINVAL;
849 	}
850 
851 	if (qp->srq) {
852 		dev_warn(&dev->pdev->dev, "QP associated with SRQ\n");
853 		*bad_wr = wr;
854 		return -EINVAL;
855 	}
856 
857 	spin_lock_irqsave(&qp->rq.lock, flags);
858 
859 	while (wr) {
860 		unsigned int tail = 0;
861 
862 		if (unlikely(wr->num_sge > qp->rq.max_sg ||
863 			     wr->num_sge < 0)) {
864 			ret = -EINVAL;
865 			*bad_wr = wr;
866 			dev_warn_ratelimited(&dev->pdev->dev,
867 					     "recv SGE overflow\n");
868 			goto out;
869 		}
870 
871 		if (unlikely(!pvrdma_idx_ring_has_space(
872 				qp->rq.ring, qp->rq.wqe_cnt, &tail))) {
873 			ret = -ENOMEM;
874 			*bad_wr = wr;
875 			dev_warn_ratelimited(&dev->pdev->dev,
876 					     "recv queue full\n");
877 			goto out;
878 		}
879 
880 		wqe_hdr = (struct pvrdma_rq_wqe_hdr *)get_rq_wqe(qp, tail);
881 		wqe_hdr->wr_id = wr->wr_id;
882 		wqe_hdr->num_sge = wr->num_sge;
883 		wqe_hdr->total_len = 0;
884 
885 		sge = (struct pvrdma_sge *)(wqe_hdr + 1);
886 		for (i = 0; i < wr->num_sge; i++) {
887 			sge->addr = wr->sg_list[i].addr;
888 			sge->length = wr->sg_list[i].length;
889 			sge->lkey = wr->sg_list[i].lkey;
890 			sge++;
891 		}
892 
893 		/* Make sure wqe is written before index update */
894 		smp_wmb();
895 
896 		/* Update shared rq ring */
897 		pvrdma_idx_ring_inc(&qp->rq.ring->prod_tail,
898 				    qp->rq.wqe_cnt);
899 
900 		wr = wr->next;
901 	}
902 
903 	spin_unlock_irqrestore(&qp->rq.lock, flags);
904 
905 	pvrdma_write_uar_qp(dev, PVRDMA_UAR_QP_RECV | qp->qp_handle);
906 
907 	return ret;
908 
909 out:
910 	spin_unlock_irqrestore(&qp->rq.lock, flags);
911 
912 	return ret;
913 }
914 
915 /**
916  * pvrdma_query_qp - query a queue pair's attributes
917  * @ibqp: the queue pair to query
918  * @attr: the queue pair's attributes
919  * @attr_mask: attributes mask
920  * @init_attr: initial queue pair attributes
921  *
922  * @returns 0 on success, otherwise returns an errno.
923  */
924 int pvrdma_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
925 		    int attr_mask, struct ib_qp_init_attr *init_attr)
926 {
927 	struct pvrdma_dev *dev = to_vdev(ibqp->device);
928 	struct pvrdma_qp *qp = to_vqp(ibqp);
929 	union pvrdma_cmd_req req;
930 	union pvrdma_cmd_resp rsp;
931 	struct pvrdma_cmd_query_qp *cmd = &req.query_qp;
932 	struct pvrdma_cmd_query_qp_resp *resp = &rsp.query_qp_resp;
933 	int ret = 0;
934 
935 	mutex_lock(&qp->mutex);
936 
937 	if (qp->state == IB_QPS_RESET) {
938 		attr->qp_state = IB_QPS_RESET;
939 		goto out;
940 	}
941 
942 	memset(cmd, 0, sizeof(*cmd));
943 	cmd->hdr.cmd = PVRDMA_CMD_QUERY_QP;
944 	cmd->qp_handle = qp->qp_handle;
945 	cmd->attr_mask = ib_qp_attr_mask_to_pvrdma(attr_mask);
946 
947 	ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_QUERY_QP_RESP);
948 	if (ret < 0) {
949 		dev_warn(&dev->pdev->dev,
950 			 "could not query queuepair, error: %d\n", ret);
951 		goto out;
952 	}
953 
954 	attr->qp_state = pvrdma_qp_state_to_ib(resp->attrs.qp_state);
955 	attr->cur_qp_state =
956 		pvrdma_qp_state_to_ib(resp->attrs.cur_qp_state);
957 	attr->path_mtu = pvrdma_mtu_to_ib(resp->attrs.path_mtu);
958 	attr->path_mig_state =
959 		pvrdma_mig_state_to_ib(resp->attrs.path_mig_state);
960 	attr->qkey = resp->attrs.qkey;
961 	attr->rq_psn = resp->attrs.rq_psn;
962 	attr->sq_psn = resp->attrs.sq_psn;
963 	attr->dest_qp_num = resp->attrs.dest_qp_num;
964 	attr->qp_access_flags =
965 		pvrdma_access_flags_to_ib(resp->attrs.qp_access_flags);
966 	attr->pkey_index = resp->attrs.pkey_index;
967 	attr->alt_pkey_index = resp->attrs.alt_pkey_index;
968 	attr->en_sqd_async_notify = resp->attrs.en_sqd_async_notify;
969 	attr->sq_draining = resp->attrs.sq_draining;
970 	attr->max_rd_atomic = resp->attrs.max_rd_atomic;
971 	attr->max_dest_rd_atomic = resp->attrs.max_dest_rd_atomic;
972 	attr->min_rnr_timer = resp->attrs.min_rnr_timer;
973 	attr->port_num = resp->attrs.port_num;
974 	attr->timeout = resp->attrs.timeout;
975 	attr->retry_cnt = resp->attrs.retry_cnt;
976 	attr->rnr_retry = resp->attrs.rnr_retry;
977 	attr->alt_port_num = resp->attrs.alt_port_num;
978 	attr->alt_timeout = resp->attrs.alt_timeout;
979 	pvrdma_qp_cap_to_ib(&attr->cap, &resp->attrs.cap);
980 	pvrdma_ah_attr_to_rdma(&attr->ah_attr, &resp->attrs.ah_attr);
981 	pvrdma_ah_attr_to_rdma(&attr->alt_ah_attr, &resp->attrs.alt_ah_attr);
982 
983 	qp->state = attr->qp_state;
984 
985 	ret = 0;
986 
987 out:
988 	attr->cur_qp_state = attr->qp_state;
989 
990 	init_attr->event_handler = qp->ibqp.event_handler;
991 	init_attr->qp_context = qp->ibqp.qp_context;
992 	init_attr->send_cq = qp->ibqp.send_cq;
993 	init_attr->recv_cq = qp->ibqp.recv_cq;
994 	init_attr->srq = qp->ibqp.srq;
995 	init_attr->xrcd = NULL;
996 	init_attr->cap = attr->cap;
997 	init_attr->sq_sig_type = 0;
998 	init_attr->qp_type = qp->ibqp.qp_type;
999 	init_attr->create_flags = 0;
1000 	init_attr->port_num = qp->port;
1001 
1002 	mutex_unlock(&qp->mutex);
1003 	return ret;
1004 }
1005