1 /* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
2 /*
3 * Copyright(c) 2016 - 2018 Intel Corporation.
4 */
5
6 #ifndef DEF_RDMAVT_INCCQ_H
7 #define DEF_RDMAVT_INCCQ_H
8
9 #include <linux/kthread.h>
10 #include <rdma/ib_user_verbs.h>
11 #include <rdma/ib_verbs.h>
12
13 /*
14 * Define an ib_cq_notify value that is not valid so we know when CQ
15 * notifications are armed.
16 */
17 #define RVT_CQ_NONE (IB_CQ_NEXT_COMP + 1)
18
19 /*
20 * Define read macro that apply smp_load_acquire memory barrier
21 * when reading indice of circular buffer that mmaped to user space.
22 */
23 #define RDMA_READ_UAPI_ATOMIC(member) smp_load_acquire(&(member).val)
24
25 /*
26 * Define write macro that uses smp_store_release memory barrier
27 * when writing indice of circular buffer that mmaped to user space.
28 */
29 #define RDMA_WRITE_UAPI_ATOMIC(member, x) smp_store_release(&(member).val, x)
30 #include <rdma/rvt-abi.h>
31
32 /*
33 * This structure is used to contain the head pointer, tail pointer,
34 * and completion queue entries as a single memory allocation so
35 * it can be mmap'ed into user space.
36 */
37 struct rvt_k_cq_wc {
38 u32 head; /* index of next entry to fill */
39 u32 tail; /* index of next ib_poll_cq() entry */
40 struct ib_wc kqueue[];
41 };
42
43 /*
44 * The completion queue structure.
45 */
46 struct rvt_cq {
47 struct ib_cq ibcq;
48 struct work_struct comptask;
49 spinlock_t lock; /* protect changes in this struct */
50 u8 notify;
51 u8 triggered;
52 u8 cq_full;
53 int comp_vector_cpu;
54 struct rvt_dev_info *rdi;
55 struct rvt_cq_wc *queue;
56 struct rvt_mmap_info *ip;
57 struct rvt_k_cq_wc *kqueue;
58 };
59
60 static inline struct rvt_cq *ibcq_to_rvtcq(struct ib_cq *ibcq)
61 {
62 return container_of(ibcq, struct rvt_cq, ibcq);
63 }
64
65 bool rvt_cq_enter(struct rvt_cq *cq, struct ib_wc *entry, bool solicited);
66
67 #endif /* DEF_RDMAVT_INCCQH */
68
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