LXR qemu/hw/rdma/vmw/pvrdma_dev

   1/*
   2 * QEMU VMWARE paravirtual RDMA ring utilities
   3 *
   4 * Copyright (C) 2018 Oracle
   5 * Copyright (C) 2018 Red Hat Inc
   6 *
   7 * Authors:
   8 *     Yuval Shaia <yuval.shaia@oracle.com>
   9 *     Marcel Apfelbaum <marcel@redhat.com>
  10 *
  11 * This work is licensed under the terms of the GNU GPL, version 2 or later.
  12 * See the COPYING file in the top-level directory.
  13 *
  14 */
  15
  16#ifndef PVRDMA_DEV_RING_H
  17#define PVRDMA_DEV_RING_H
  18
  19
  20#define MAX_RING_NAME_SZ 32
  21
  22typedef struct PvrdmaRingState {
  23    int prod_tail; /* producer tail */
  24    int cons_head; /* consumer head */
  25} PvrdmaRingState;
  26
  27typedef struct PvrdmaRing {
  28    char name[MAX_RING_NAME_SZ];
  29    PCIDevice *dev;
  30    uint32_t max_elems;
  31    size_t elem_sz;
  32    PvrdmaRingState *ring_state; /* used only for unmap */
  33    int npages;
  34    void **pages;
  35} PvrdmaRing;
  36
  37int pvrdma_ring_init(PvrdmaRing *ring, const char *name, PCIDevice *dev,
  38                     PvrdmaRingState *ring_state, uint32_t max_elems,
  39                     size_t elem_sz, dma_addr_t *tbl, uint32_t npages);
  40void *pvrdma_ring_next_elem_read(PvrdmaRing *ring);
  41void pvrdma_ring_read_inc(PvrdmaRing *ring);
  42void *pvrdma_ring_next_elem_write(PvrdmaRing *ring);
  43void pvrdma_ring_write_inc(PvrdmaRing *ring);
  44void pvrdma_ring_free(PvrdmaRing *ring);
  45
  46#endif
  47