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net: add tap_set_offload()

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This API allows virtio-net to enable various offload features on a
tap interface - e.g. to tell the host kernel it can pass up partial
checksums to userspace.

Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Mark McLoughlin 2009-10-22 17:43:46 +01:00 • committed by Anthony Liguori
parent 3a330134b3
commit b1c28b464d
3 changed files with 32 additions and 0 deletions
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24
net.c
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@ -1302,6 +1302,9 @@ int tap_has_vnet_hdr(VLANClientState *vc)
void tap_using_vnet_hdr(VLANClientState *vc, int using_vnet_hdr)
{
}
void tap_set_offload(VLANClientState *vc, int csum, int tso4, int tso6, int ecn)
{
}
#else /* !defined(_WIN32) */
/* Maximum GSO packet size (64k) plus plenty of room for
@ -1539,6 +1542,27 @@ static int tap_probe_vnet_hdr(int fd)
return ifr.ifr_flags & IFF_VNET_HDR;
}
void tap_set_offload(VLANClientState *vc, int csum, int tso4, int tso6, int ecn)
{
TAPState *s = vc->opaque;
unsigned int offload = 0;
if (csum) {
offload |= TUN_F_CSUM;
if (tso4)
offload |= TUN_F_TSO4;
if (tso6)
offload |= TUN_F_TSO6;
if ((tso4 || tso6) && ecn)
offload |= TUN_F_TSO_ECN;
}
if (ioctl(s->fd, TUNSETOFFLOAD, offload) != 0) {
fprintf(stderr, "TUNSETOFFLOAD ioctl() failed: %s\n",
strerror(errno));
}
}
static void tap_cleanup(VLANClientState *vc)
{
TAPState *s = vc->opaque;