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[Qemu-devel] [PATCH 14/19] virtio-net: add vnet_hdr support
From: |
Mark McLoughlin |
Subject: |
[Qemu-devel] [PATCH 14/19] virtio-net: add vnet_hdr support |
Date: |
Wed, 21 Oct 2009 12:27:53 +0100 |
With '-netdev tap,id=foo -nic model=virtio,netdev=foo' virtio-net can
detect that its peer (i.e. the tap backend) supports vnet headers
and advertise to the guest that it can send packets with partial
checksums and/or TSO packets.
One complication is that if we're migrating and the source host
supports IFF_VNET_HDR but the destination host doesn't, we can't then
stop the guest from using those features. In this scenario, we just
fail the migration.
Signed-off-by: Mark McLoughlin <address@hidden>
---
hw/virtio-net.c | 49 ++++++++++++++++++++++++++++++++++++++++++-------
1 files changed, 42 insertions(+), 7 deletions(-)
diff --git a/hw/virtio-net.c b/hw/virtio-net.c
index 218f985..5ce4b42 100644
--- a/hw/virtio-net.c
+++ b/hw/virtio-net.c
@@ -120,8 +120,20 @@ static void virtio_net_reset(VirtIODevice *vdev)
memset(n->vlans, 0, MAX_VLAN >> 3);
}
+static int peer_has_vnet_hdr(VirtIONet *n)
+{
+ if (!n->vc->peer)
+ return 0;
+
+ if (n->vc->peer->type != NET_CLIENT_TYPE_TAP)
+ return 0;
+
+ return tap_has_vnet_hdr(n->vc->peer);
+}
+
static uint32_t virtio_net_get_features(VirtIODevice *vdev)
{
+ VirtIONet *n = to_virtio_net(vdev);
uint32_t features = (1 << VIRTIO_NET_F_MAC) |
(1 << VIRTIO_NET_F_MRG_RXBUF) |
(1 << VIRTIO_NET_F_STATUS) |
@@ -130,6 +142,15 @@ static uint32_t virtio_net_get_features(VirtIODevice *vdev)
(1 << VIRTIO_NET_F_CTRL_VLAN) |
(1 << VIRTIO_NET_F_CTRL_RX_EXTRA);
+ if (peer_has_vnet_hdr(n)) {
+ tap_using_vnet_hdr(n->vc->peer, 1);
+
+ features |= (1 << VIRTIO_NET_F_CSUM);
+ features |= (1 << VIRTIO_NET_F_HOST_TSO4);
+ features |= (1 << VIRTIO_NET_F_HOST_TSO6);
+ features |= (1 << VIRTIO_NET_F_HOST_ECN);
+ }
+
return features;
}
@@ -359,6 +380,11 @@ static int receive_header(VirtIONet *n, struct iovec *iov,
int iovcnt,
hdr->flags = 0;
hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE;
+ if (peer_has_vnet_hdr(n)) {
+ memcpy(hdr, buf, sizeof(*hdr));
+ offset = sizeof(*hdr);
+ }
+
/* We only ever receive a struct virtio_net_hdr from the tapfd,
* but we may be passing along a larger header to the guest.
*/
@@ -378,6 +404,10 @@ static int receive_filter(VirtIONet *n, const uint8_t
*buf, int size)
if (n->promisc)
return 1;
+ if (peer_has_vnet_hdr(n)) {
+ ptr += sizeof(struct virtio_net_hdr);
+ }
+
if (!memcmp(&ptr[12], vlan, sizeof(vlan))) {
int vid = be16_to_cpup((uint16_t *)(ptr + 14)) & 0xfff;
if (!(n->vlans[vid >> 5] & (1U << (vid & 0x1f))))
@@ -510,7 +540,6 @@ static void virtio_net_tx_complete(VLANClientState *vc,
ssize_t len)
static void virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq)
{
VirtQueueElement elem;
- int has_vnet_hdr = 0;
if (!(n->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK))
return;
@@ -537,7 +566,7 @@ static void virtio_net_flush_tx(VirtIONet *n, VirtQueue *vq)
}
/* ignore the header if GSO is not supported */
- if (!has_vnet_hdr) {
+ if (!peer_has_vnet_hdr(n)) {
out_num--;
out_sg++;
len += hdr_len;
@@ -610,7 +639,7 @@ static void virtio_net_save(QEMUFile *f, void *opaque)
qemu_put_be32(f, n->mac_table.in_use);
qemu_put_buffer(f, n->mac_table.macs, n->mac_table.in_use * ETH_ALEN);
qemu_put_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
- qemu_put_be32(f, 0); /* vnet-hdr placeholder */
+ qemu_put_be32(f, peer_has_vnet_hdr(n));
qemu_put_byte(f, n->mac_table.multi_overflow);
qemu_put_byte(f, n->mac_table.uni_overflow);
qemu_put_byte(f, n->alluni);
@@ -662,10 +691,16 @@ static int virtio_net_load(QEMUFile *f, void *opaque, int
version_id)
if (version_id >= 6)
qemu_get_buffer(f, (uint8_t *)n->vlans, MAX_VLAN >> 3);
- if (version_id >= 7 && qemu_get_be32(f)) {
- fprintf(stderr,
- "virtio-net: saved image requires vnet header support\n");
- exit(1);
+ if (version_id >= 7) {
+ if (qemu_get_be32(f) && !peer_has_vnet_hdr(n)) {
+ fprintf(stderr,
+ "virtio-net: saved image requires vnet_hdr=on\n");
+ return -1;
+ }
+
+ if (peer_has_vnet_hdr(n)) {
+ tap_using_vnet_hdr(n->vc->peer, 1);
+ }
}
if (version_id >= 9) {
--
1.6.2.5
- [Qemu-devel] [PATCH 03/19] net: make tap_receive() re-use tap_receive_iov() code, (continued)
- [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, 2009/10/21
- [Qemu-devel] [PATCH 14/19] virtio-net: add vnet_hdr support,
Mark McLoughlin <=
- [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