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 43