xref: /linux/include/rdma/rdmavt_cq.h (revision 4b4193256c8d3bc3a5397b5cd9494c2ad386317d)
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 
ibcq_to_rvtcq(struct ib_cq * ibcq)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