numam-dpdk/drivers/net/virtio/virtqueue.c
Bernard Iremonger 2f7fdb9d52 virtio: check virtqueue parameter when detaching
If vq is NULL, there is a segmentation fault.

Signed-off-by: Bernard Iremonger <bernard.iremonger@intel.com>
Acked-by: Changchun Ouyang <changchun.ouyang@intel.com>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
2015-07-19 22:24:42 +02:00

73 lines
2.5 KiB
C

/*-
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#include <stdint.h>
#include <rte_mbuf.h>
#include "virtqueue.h"
#include "virtio_logs.h"
#include "virtio_pci.h"
void
virtqueue_disable_intr(struct virtqueue *vq)
{
/*
* Set VRING_AVAIL_F_NO_INTERRUPT to hint host
* not to interrupt when it consumes packets
* Note: this is only considered a hint to the host
*/
vq->vq_ring.avail->flags |= VRING_AVAIL_F_NO_INTERRUPT;
}
/*
* Two types of mbuf to be cleaned:
* 1) mbuf that has been consumed by backend but not used by virtio.
* 2) mbuf that hasn't been consued by backend.
*/
struct rte_mbuf *
virtqueue_detatch_unused(struct virtqueue *vq)
{
struct rte_mbuf *cookie;
int idx;
if (vq != NULL)
for (idx = 0; idx < vq->vq_nentries; idx++) {
cookie = vq->vq_descx[idx].cookie;
if (cookie != NULL) {
vq->vq_descx[idx].cookie = NULL;
return cookie;
}
}
return NULL;
}