3aa1b7af0f
The pvrdma code relies on the pvrdma_ring.h kernel header for some basic ring buffer handling. The content of that header isn't very exciting, but contains some (q)atomic_*() invocations that (a) cause manual massaging when doing a headers update, and (b) are an indication that we probably should not be importing that header at all. Let's reimplement the ring buffer handling directly in the pvrdma code instead. This arguably also improves readability of the code. Importing the header can now be dropped. Signed-off-by: Cornelia Huck <cohuck@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Yuval Shaia <yuval.shaia.ml@gmail.com> Tested-by: Yuval Shaia <yuval.shaia.ml@gmail.com> Signed-off-by: Jason Wang <jasowang@redhat.com>
47 lines
1.2 KiB
C
47 lines
1.2 KiB
C
/*
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* QEMU VMWARE paravirtual RDMA ring utilities
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*
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* Copyright (C) 2018 Oracle
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* Copyright (C) 2018 Red Hat Inc
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*
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* Authors:
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* Yuval Shaia <yuval.shaia@oracle.com>
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* Marcel Apfelbaum <marcel@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#ifndef PVRDMA_DEV_RING_H
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#define PVRDMA_DEV_RING_H
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#define MAX_RING_NAME_SZ 32
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typedef struct PvrdmaRingState {
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int prod_tail; /* producer tail */
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int cons_head; /* consumer head */
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} PvrdmaRingState;
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typedef struct PvrdmaRing {
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char name[MAX_RING_NAME_SZ];
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PCIDevice *dev;
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uint32_t max_elems;
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size_t elem_sz;
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PvrdmaRingState *ring_state; /* used only for unmap */
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int npages;
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void **pages;
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} PvrdmaRing;
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int pvrdma_ring_init(PvrdmaRing *ring, const char *name, PCIDevice *dev,
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PvrdmaRingState *ring_state, uint32_t max_elems,
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size_t elem_sz, dma_addr_t *tbl, uint32_t npages);
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void *pvrdma_ring_next_elem_read(PvrdmaRing *ring);
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void pvrdma_ring_read_inc(PvrdmaRing *ring);
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void *pvrdma_ring_next_elem_write(PvrdmaRing *ring);
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void pvrdma_ring_write_inc(PvrdmaRing *ring);
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void pvrdma_ring_free(PvrdmaRing *ring);
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#endif
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