rdmavt_cq.h revision 331769 
1#ifndef DEF_RDMAVT_INCCQ_H
2#define DEF_RDMAVT_INCCQ_H
3
4/*
5 *
6 * This file is provided under a dual BSD/GPLv2 license.  When using or
7 * redistributing this file, you may do so under either license.
8 *
9 * GPL LICENSE SUMMARY
10 *
11 * Copyright(c) 2016 Intel Corporation.
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of version 2 of the GNU General Public License as
15 * published by the Free Software Foundation.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
20 * General Public License for more details.
21 *
22 * BSD LICENSE
23 *
24 * Copyright(c) 2015 Intel Corporation.
25 *
26 * Redistribution and use in source and binary forms, with or without
27 * modification, are permitted provided that the following conditions
28 * are met:
29 *
30 *  - Redistributions of source code must retain the above copyright
31 *    notice, this list of conditions and the following disclaimer.
32 *  - Redistributions in binary form must reproduce the above copyright
33 *    notice, this list of conditions and the following disclaimer in
34 *    the documentation and/or other materials provided with the
35 *    distribution.
36 *  - Neither the name of Intel Corporation nor the names of its
37 *    contributors may be used to endorse or promote products derived
38 *    from this software without specific prior written permission.
39 *
40 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
41 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
42 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
43 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
44 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
46 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
47 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
48 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
49 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
50 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
51 *
52 */
53
54#include <linux/kthread.h>
55#include <rdma/ib_user_verbs.h>
56
57/*
58 * Define an ib_cq_notify value that is not valid so we know when CQ
59 * notifications are armed.
60 */
61#define RVT_CQ_NONE      (IB_CQ_NEXT_COMP + 1)
62
63/*
64 * This structure is used to contain the head pointer, tail pointer,
65 * and completion queue entries as a single memory allocation so
66 * it can be mmap'ed into user space.
67 */
68struct rvt_cq_wc {
69	u32 head;               /* index of next entry to fill */
70	u32 tail;               /* index of next ib_poll_cq() entry */
71	union {
72		/* these are actually size ibcq.cqe + 1 */
73		struct ib_uverbs_wc uqueue[0];
74		struct ib_wc kqueue[0];
75	};
76};
77
78/*
79 * The completion queue structure.
80 */
81struct rvt_cq {
82	struct ib_cq ibcq;
83	struct kthread_work comptask;
84	spinlock_t lock; /* protect changes in this struct */
85	u8 notify;
86	u8 triggered;
87	struct rvt_dev_info *rdi;
88	struct rvt_cq_wc *queue;
89	struct rvt_mmap_info *ip;
90};
91
92static inline struct rvt_cq *ibcq_to_rvtcq(struct ib_cq *ibcq)
93{
94	return container_of(ibcq, struct rvt_cq, ibcq);
95}
96
97void rvt_cq_enter(struct rvt_cq *cq, struct ib_wc *entry, bool solicited);
98
99#endif          /* DEF_RDMAVT_INCCQH */
100