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
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;
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);
#endif
/* Ioctl defines */
#define TUNSETIFF _IOW('T', 202, int)
#define TUNGETFEATURES _IOR('T', 207, unsigned int)
+#define TUNSETOFFLOAD _IOW('T', 208, unsigned int)
#define TUNGETIFF _IOR('T', 210, unsigned int)
#define TUNSETSNDBUF _IOW('T', 212, int)
#define IFF_NO_PI 0x1000
#define IFF_VNET_HDR 0x4000
+/* Features for GSO (TUNSETOFFLOAD). */
+#define TUN_F_CSUM 0x01 /* You can hand me unchecksummed packets. */
+#define TUN_F_TSO4 0x02 /* I can handle TSO for IPv4 packets */
+#define TUN_F_TSO6 0x04 /* I can handle TSO for IPv6 packets */
+#define TUN_F_TSO_ECN 0x08 /* I can handle TSO with ECN bits. */
+
struct virtio_net_hdr
{
uint8_t flags;