xref: /openbmc/linux/include/rdma/rdmavt_cq.h (revision 50df3be7)
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 - 2018 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 #include <rdma/ib_verbs.h>
57 
58 /*
59  * Define an ib_cq_notify value that is not valid so we know when CQ
60  * notifications are armed.
61  */
62 #define RVT_CQ_NONE      (IB_CQ_NEXT_COMP + 1)
63 
64 /*
65  * Define read macro that apply smp_load_acquire memory barrier
66  * when reading indice of circular buffer that mmaped to user space.
67  */
68 #define RDMA_READ_UAPI_ATOMIC(member) smp_load_acquire(&(member).val)
69 
70 /*
71  * Define write macro that uses smp_store_release memory barrier
72  * when writing indice of circular buffer that mmaped to user space.
73  */
74 #define RDMA_WRITE_UAPI_ATOMIC(member, x) smp_store_release(&(member).val, x)
75 #include <rdma/rvt-abi.h>
76 
77 /*
78  * This structure is used to contain the head pointer, tail pointer,
79  * and completion queue entries as a single memory allocation so
80  * it can be mmap'ed into user space.
81  */
82 struct rvt_k_cq_wc {
83 	u32 head;               /* index of next entry to fill */
84 	u32 tail;               /* index of next ib_poll_cq() entry */
85 	struct ib_wc kqueue[];
86 };
87 
88 /*
89  * The completion queue structure.
90  */
91 struct rvt_cq {
92 	struct ib_cq ibcq;
93 	struct work_struct comptask;
94 	spinlock_t lock; /* protect changes in this struct */
95 	u8 notify;
96 	u8 triggered;
97 	u8 cq_full;
98 	int comp_vector_cpu;
99 	struct rvt_dev_info *rdi;
100 	struct rvt_cq_wc *queue;
101 	struct rvt_mmap_info *ip;
102 	struct rvt_k_cq_wc *kqueue;
103 };
104 
105 static inline struct rvt_cq *ibcq_to_rvtcq(struct ib_cq *ibcq)
106 {
107 	return container_of(ibcq, struct rvt_cq, ibcq);
108 }
109 
110 bool rvt_cq_enter(struct rvt_cq *cq, struct ib_wc *entry, bool solicited);
111 
112 #endif          /* DEF_RDMAVT_INCCQH */
113