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[Qemu-devel] [PATCH 15/19] net: add tap_set_offload()
From: |
Mark McLoughlin |
Subject: |
[Qemu-devel] [PATCH 15/19] net: add tap_set_offload() |
Date: |
Wed, 21 Oct 2009 12:27:54 +0100 |
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 <address@hidden>
---
net.c | 24 ++++++++++++++++++++++++
net.h | 1 +
tap-linux.h | 7 +++++++
3 files changed, 32 insertions(+), 0 deletions(-)
diff --git a/net.c b/net.c
index b44495d..746a3d6 100644
--- a/net.c
+++ b/net.c
@@ -1287,6 +1287,9 @@ 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
@@ -1524,6 +1527,27 @@ 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;
diff --git a/net.h b/net.h
index 6255e2b..a0f0359 100644
--- a/net.h
+++ b/net.h
@@ -170,5 +170,6 @@ VLANClientState *qdev_get_vlan_client(DeviceState *dev,
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
diff --git a/tap-linux.h b/tap-linux.h
index 8e75348..241cf83 100644
--- a/tap-linux.h
+++ b/tap-linux.h
@@ -22,6 +22,7 @@
/* 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)
@@ -30,6 +31,12 @@
#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;
--
1.6.2.5
- [Qemu-devel] [PATCH 00/19], Mark McLoughlin, 2009/10/21
- [Qemu-devel] [PATCH 03/19] net: make tap_receive() re-use tap_receive_iov() code, Mark McLoughlin, 2009/10/21
- [Qemu-devel] [PATCH 01/19] net: remove unused includes of if_tun.h and if_tap.h, Mark McLoughlin, 2009/10/21
- [Qemu-devel] [PATCH 08/19] net: add tap_has_vnet_hdr() and tap_using_vnet_hdr() APIs, Mark McLoughlin, 2009/10/21
- [Qemu-devel] [PATCH 04/19] net: enable IFF_VNET_HDR on tap fds if available, Mark McLoughlin, 2009/10/21
- [Qemu-devel] [PATCH 02/19] net: import linux tap ioctl definitions, Mark McLoughlin, 2009/10/21
- [Qemu-devel] [PATCH 06/19] net: add a vnet_hdr=on|off parameter, Mark McLoughlin, 2009/10/21
- [Qemu-devel] [PATCH 07/19] net: add a client type code, Mark McLoughlin, 2009/10/21
- [Qemu-devel] [PATCH 13/19] net: implement tap support for receive_raw(), Mark McLoughlin, 2009/10/21
- [Qemu-devel] [PATCH 05/19] net: refactor tap initialization, Mark McLoughlin, 2009/10/21
- [Qemu-devel] [PATCH 15/19] net: add tap_set_offload(),
Mark McLoughlin <=
- [Qemu-devel] [PATCH 14/19] virtio-net: add vnet_hdr support, Mark McLoughlin, 2009/10/21
- [Qemu-devel] [PATCH 19/19] virtio-net: add tap_has_ufo flag to saved state, Mark McLoughlin, 2009/10/21
- [Qemu-devel] [PATCH 10/19] net: add an API for 'raw' packets, Mark McLoughlin, 2009/10/21
- [Qemu-devel] [PATCH 09/19] net: add flags parameter to packet queue interface, Mark McLoughlin, 2009/10/21
- [Qemu-devel] [PATCH 12/19] net: use qemu_send_packet_raw() in qemu_announce_self(), Mark McLoughlin, 2009/10/21
- [Qemu-devel] [PATCH 16/19] virtio-net: enable tap offload if guest supports it, Mark McLoughlin, 2009/10/21
- [Qemu-devel] [PATCH 17/19] Work around dhclient brokenness, Mark McLoughlin, 2009/10/21
- [Qemu-devel] [PATCH 18/19] Enable UFO on virtio-net and tap devices, Mark McLoughlin, 2009/10/21
- [Qemu-devel] [PATCH 11/19] net: add receive_raw parameter to qemu_new_vlan_client(), Mark McLoughlin, 2009/10/21