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authorMark McLoughlin <markmc@redhat.com>2009-10-22 17:43:46 +0100
committerAnthony Liguori <aliguori@us.ibm.com>2009-10-27 12:29:02 -0500
commitb1c28b464d5f21805d322b67f008e114a484146d (patch)
treef98e91c65646c31c3096cca5c6870c922e43dfc7 /net.c
parentvirtio-net: add vnet_hdr support (diff)
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net: add tap_set_offload()
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>
Diffstat (limited to 'net.c')
-rw-r--r--net.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/net.c b/net.c
index 6f14e22d8..b061491b7 100644
--- a/net.c
+++ b/net.c
@@ -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;