1 /* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) */
2
3 /*
4 * This file contains defines, structures, etc. that are used
5 * to communicate between kernel and user code.
6 */
7
8 #ifndef RVT_ABI_USER_H
9 #define RVT_ABI_USER_H
10
11 #include <linux/types.h>
12 #include <rdma/ib_user_verbs.h>
13 #ifndef RDMA_ATOMIC_UAPI
14 #define RDMA_ATOMIC_UAPI(_type, _name) struct{ _type val; } _name
15 #endif
16
17 struct rvt_wqe_sge {
18 __aligned_u64 addr;
19 __u32 length;
20 __u32 lkey;
21 };
22
23 /*
24 * This structure is used to contain the head pointer, tail pointer,
25 * and completion queue entries as a single memory allocation so
26 * it can be mmap'ed into user space.
27 */
28 struct rvt_cq_wc {
29 /* index of next entry to fill */
30 RDMA_ATOMIC_UAPI(__u32, head);
31 /* index of next ib_poll_cq() entry */
32 RDMA_ATOMIC_UAPI(__u32, tail);
33
34 /* these are actually size ibcq.cqe + 1 */
35 struct ib_uverbs_wc uqueue[];
36 };
37
38 /*
39 * Receive work request queue entry.
40 * The size of the sg_list is determined when the QP (or SRQ) is created
41 * and stored in qp->r_rq.max_sge (or srq->rq.max_sge).
42 */
43 struct rvt_rwqe {
44 __u64 wr_id;
45 __u8 num_sge;
46 __u8 padding[7];
47 struct rvt_wqe_sge sg_list[];
48 };
49
50 /*
51 * This structure is used to contain the head pointer, tail pointer,
52 * and receive work queue entries as a single memory allocation so
53 * it can be mmap'ed into user space.
54 * Note that the wq array elements are variable size so you can't
55 * just index into the array to get the N'th element;
56 * use get_rwqe_ptr() for user space and rvt_get_rwqe_ptr()
57 * for kernel space.
58 */
59 struct rvt_rwq {
60 /* new work requests posted to the head */
61 RDMA_ATOMIC_UAPI(__u32, head);
62 /* receives pull requests from here. */
63 RDMA_ATOMIC_UAPI(__u32, tail);
64 struct rvt_rwqe wq[];
65 };
66 #endif /* RVT_ABI_USER_H */