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>
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24
net.c
24
net.c
@ -1302,6 +1302,9 @@ int tap_has_vnet_hdr(VLANClientState *vc)
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void tap_using_vnet_hdr(VLANClientState *vc, int using_vnet_hdr)
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void tap_using_vnet_hdr(VLANClientState *vc, int using_vnet_hdr)
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{
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{
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}
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}
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void tap_set_offload(VLANClientState *vc, int csum, int tso4, int tso6, int ecn)
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{
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}
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#else /* !defined(_WIN32) */
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#else /* !defined(_WIN32) */
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/* Maximum GSO packet size (64k) plus plenty of room for
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/* Maximum GSO packet size (64k) plus plenty of room for
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@ -1539,6 +1542,27 @@ static int tap_probe_vnet_hdr(int fd)
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return ifr.ifr_flags & IFF_VNET_HDR;
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return ifr.ifr_flags & IFF_VNET_HDR;
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}
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}
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void tap_set_offload(VLANClientState *vc, int csum, int tso4, int tso6, int ecn)
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{
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TAPState *s = vc->opaque;
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unsigned int offload = 0;
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if (csum) {
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offload |= TUN_F_CSUM;
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if (tso4)
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offload |= TUN_F_TSO4;
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if (tso6)
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offload |= TUN_F_TSO6;
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if ((tso4 || tso6) && ecn)
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offload |= TUN_F_TSO_ECN;
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}
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if (ioctl(s->fd, TUNSETOFFLOAD, offload) != 0) {
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fprintf(stderr, "TUNSETOFFLOAD ioctl() failed: %s\n",
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strerror(errno));
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}
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}
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static void tap_cleanup(VLANClientState *vc)
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static void tap_cleanup(VLANClientState *vc)
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{
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{
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TAPState *s = vc->opaque;
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TAPState *s = vc->opaque;
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1
net.h
1
net.h
@ -182,5 +182,6 @@ void qdev_set_nic_properties(DeviceState *dev, NICInfo *nd);
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int tap_has_vnet_hdr(VLANClientState *vc);
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int tap_has_vnet_hdr(VLANClientState *vc);
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void tap_using_vnet_hdr(VLANClientState *vc, int using_vnet_hdr);
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void tap_using_vnet_hdr(VLANClientState *vc, int using_vnet_hdr);
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void tap_set_offload(VLANClientState *vc, int csum, int tso4, int tso6, int ecn);
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#endif
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#endif
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@ -22,6 +22,7 @@
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/* Ioctl defines */
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/* Ioctl defines */
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#define TUNSETIFF _IOW('T', 202, int)
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#define TUNSETIFF _IOW('T', 202, int)
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#define TUNGETFEATURES _IOR('T', 207, unsigned int)
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#define TUNGETFEATURES _IOR('T', 207, unsigned int)
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#define TUNSETOFFLOAD _IOW('T', 208, unsigned int)
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#define TUNGETIFF _IOR('T', 210, unsigned int)
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#define TUNGETIFF _IOR('T', 210, unsigned int)
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#define TUNSETSNDBUF _IOW('T', 212, int)
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#define TUNSETSNDBUF _IOW('T', 212, int)
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@ -30,6 +31,12 @@
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#define IFF_NO_PI 0x1000
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#define IFF_NO_PI 0x1000
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#define IFF_VNET_HDR 0x4000
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#define IFF_VNET_HDR 0x4000
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/* Features for GSO (TUNSETOFFLOAD). */
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#define TUN_F_CSUM 0x01 /* You can hand me unchecksummed packets. */
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#define TUN_F_TSO4 0x02 /* I can handle TSO for IPv4 packets */
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#define TUN_F_TSO6 0x04 /* I can handle TSO for IPv6 packets */
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#define TUN_F_TSO_ECN 0x08 /* I can handle TSO with ECN bits. */
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struct virtio_net_hdr
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struct virtio_net_hdr
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{
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{
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uint8_t flags;
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uint8_t flags;
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