LXR linux/include/uapi/rdma/rvt-abi.h

   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
  17struct 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 */
  28struct 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 */
  43struct 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 */
  59struct 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 */
  67