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/*
* QEMU VMWARE paravirtual RDMA ring utilities
*
* Copyright (C) 2018 Oracle
* Copyright (C) 2018 Red Hat Inc
*
* Authors:
* Yuval Shaia <yuval.shaia@oracle.com>
* Marcel Apfelbaum <marcel@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
*/
#ifndef PVRDMA_DEV_RING_H
#define PVRDMA_DEV_RING_H
#define MAX_RING_NAME_SZ 32
typedef struct PvrdmaRingState {
int prod_tail; /* producer tail */
int cons_head; /* consumer head */
} PvrdmaRingState;
typedef struct PvrdmaRing {
char name[MAX_RING_NAME_SZ];
PCIDevice *dev;
uint32_t max_elems;
size_t elem_sz;
PvrdmaRingState *ring_state; /* used only for unmap */
int npages;
void **pages;
} PvrdmaRing;
int pvrdma_ring_init(PvrdmaRing *ring, const char *name, PCIDevice *dev,
PvrdmaRingState *ring_state, uint32_t max_elems,
size_t elem_sz, dma_addr_t *tbl, uint32_t npages);
void *pvrdma_ring_next_elem_read(PvrdmaRing *ring);
void pvrdma_ring_read_inc(PvrdmaRing *ring);
void *pvrdma_ring_next_elem_write(PvrdmaRing *ring);
void pvrdma_ring_write_inc(PvrdmaRing *ring);
void pvrdma_ring_free(PvrdmaRing *ring);
#endif
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