a9718ef000
Let dataplane allocate different region for the desc/avail/used ring regions. Take VIRTIO_RING_F_EVENT_IDX into account to increase the used/avail rings accordingly. [Fix 32-bit builds by changing 16lx format specifier to HWADDR_PRIx. --Stefan] Signed-off-by: Pierre Morel <pmorel@linux.vnet.ibm.com> Tested-by: Greg Kurz <gkurz@linux.vnet.ibm.com> Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com> Message-id: 1441625636-23773-1-git-send-email-pmorel@linux.vnet.ibm.com (changed __virtio16 into uint16_t, map descriptor table and available ring read-only) Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
52 lines
1.9 KiB
C
52 lines
1.9 KiB
C
/* Copyright 2012 Red Hat, Inc. and/or its affiliates
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* Copyright IBM, Corp. 2012
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*
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* Based on Linux 2.6.39 vhost code:
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* Copyright (C) 2009 Red Hat, Inc.
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* Copyright (C) 2006 Rusty Russell IBM Corporation
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*
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* Author: Michael S. Tsirkin <mst@redhat.com>
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* Stefan Hajnoczi <stefanha@redhat.com>
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*
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* Inspiration, some code, and most witty comments come from
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* Documentation/virtual/lguest/lguest.c, by Rusty Russell
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*
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* This work is licensed under the terms of the GNU GPL, version 2.
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*/
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#ifndef VRING_H
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#define VRING_H
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#include "qemu-common.h"
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#include "standard-headers/linux/virtio_ring.h"
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#include "hw/virtio/virtio.h"
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typedef struct {
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MemoryRegion *mr_desc; /* memory region for the vring desc */
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MemoryRegion *mr_avail; /* memory region for the vring avail */
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MemoryRegion *mr_used; /* memory region for the vring used */
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struct vring vr; /* virtqueue vring mapped to host memory */
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uint16_t last_avail_idx; /* last processed avail ring index */
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uint16_t last_used_idx; /* last processed used ring index */
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uint16_t signalled_used; /* EVENT_IDX state */
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bool signalled_used_valid;
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bool broken; /* was there a fatal error? */
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} Vring;
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/* Fail future vring_pop() and vring_push() calls until reset */
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static inline void vring_set_broken(Vring *vring)
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{
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vring->broken = true;
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}
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bool vring_setup(Vring *vring, VirtIODevice *vdev, int n);
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void vring_teardown(Vring *vring, VirtIODevice *vdev, int n);
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void vring_disable_notification(VirtIODevice *vdev, Vring *vring);
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bool vring_enable_notification(VirtIODevice *vdev, Vring *vring);
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bool vring_should_notify(VirtIODevice *vdev, Vring *vring);
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int vring_pop(VirtIODevice *vdev, Vring *vring, VirtQueueElement *elem);
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void vring_push(VirtIODevice *vdev, Vring *vring, VirtQueueElement *elem,
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int len);
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#endif /* VRING_H */
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