hw/rdma/vmw/pvrdma_dev_ring.h

   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 #include "qemu/typedefs.h"
  20
  21 #define MAX_RING_NAME_SZ 32
  22
  23 typedef struct PvrdmaRing {
  24     char name[MAX_RING_NAME_SZ];
  25     PCIDevice *dev;
  26     uint32_t max_elems;
  27     size_t elem_sz;
  28     struct pvrdma_ring *ring_state; /* used only for unmap */
  29     int npages;
  30     void **pages;
  31 } PvrdmaRing;
  32
  33 int pvrdma_ring_init(PvrdmaRing *ring, const char *name, PCIDevice *dev,
  34                      struct pvrdma_ring *ring_state, uint32_t max_elems,
  35                      size_t elem_sz, dma_addr_t *tbl, uint32_t npages);
  36 void *pvrdma_ring_next_elem_read(PvrdmaRing *ring);
  37 void pvrdma_ring_read_inc(PvrdmaRing *ring);
  38 void *pvrdma_ring_next_elem_write(PvrdmaRing *ring);
  39 void pvrdma_ring_write_inc(PvrdmaRing *ring);
  40 void pvrdma_ring_free(PvrdmaRing *ring);
  41
  42 #endif