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 22 typedef struct PvrdmaRingState { 23 int prod_tail; /* producer tail */ 24 int cons_head; /* consumer head */ 25 } PvrdmaRingState; 26 27 typedef 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 37 int 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); 40 void *pvrdma_ring_next_elem_read(PvrdmaRing *ring); 41 void pvrdma_ring_read_inc(PvrdmaRing *ring); 42 void *pvrdma_ring_next_elem_write(PvrdmaRing *ring); 43 void pvrdma_ring_write_inc(PvrdmaRing *ring); 44 void pvrdma_ring_free(PvrdmaRing *ring); 45 46 #endif 47