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tap: add APIs for vnet header length

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Add APIs to control host header length. First user
will be vhost-net.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2010-07-16 11:16:06 +03:00
parent ef4252b149
commit 445d892f43
8 changed files with 92 additions and 0 deletions
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21
net/tap.c
View file

@ -232,6 +232,27 @@ int tap_has_vnet_hdr(VLANClientState *nc)
return !!s->host_vnet_hdr_len;
}
int tap_has_vnet_hdr_len(VLANClientState *nc, int len)
{
TAPState *s = DO_UPCAST(TAPState, nc, nc);
assert(nc->info->type == NET_CLIENT_TYPE_TAP);
return tap_probe_vnet_hdr_len(s->fd, len);
}
void tap_set_vnet_hdr_len(VLANClientState *nc, int len)
{
TAPState *s = DO_UPCAST(TAPState, nc, nc);
assert(nc->info->type == NET_CLIENT_TYPE_TAP);
assert(len == sizeof(struct virtio_net_hdr_mrg_rxbuf) ||
len == sizeof(struct virtio_net_hdr));
tap_fd_set_vnet_hdr_len(s->fd, len);
s->host_vnet_hdr_len = len;
}
void tap_using_vnet_hdr(VLANClientState *nc, int using_vnet_hdr)
{
TAPState *s = DO_UPCAST(TAPState, nc, nc);