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authorScott Feldman <sfeldma@cumulusnetworks.com>2013-03-18 11:43:44 -0700
committerStefan Hajnoczi <stefanha@redhat.com>2013-03-25 11:14:07 +0100
commitd32fcad366e5f45d33dab2ee4de0e5729439680b (patch)
tree6881ca1e804644a6361a76813318bcf1a36c7d99 /include
parent786fd2b0f87baded8c9e55307b99719eea3e016e (diff)
net: increase buffer size to accommodate Jumbo frame pkts
Socket buffer sizes were hard-coded to 4K for VDE and socket netdevs. Bump this up to 68K (ala tap netdev) to handle maximum GSO packet size (64k) plus plenty of room for the ethernet and virtio_net headers. Originally, ran into this limitation when using -netdev UDP sockets to connect VM-to-VM, where VM interface is configure with MTU=9000. (Using virtio_net NIC model). Test is simple: ping -M do -s 8500 <target>. This test will attempt to ping with unfragmented packet of given size. Without patch, size is limited to < 4K (minus protocol hdrs). With patch, ping test works with pkt size up to 9000 (again, minus protocol hdrs). v2: per Stefan, increase buf size to (4096+65536) as done in tap and apply to vde and socket netdevs. v1: increase buf size to 12K just for -netdev UDP sockets Signed-off-by: Scott Feldman <sfeldma@cumulusnetworks.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Diffstat (limited to 'include')
-rw-r--r--include/net/net.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/net/net.h b/include/net/net.h
index cb049a16a3..43d85a16eb 100644
--- a/include/net/net.h
+++ b/include/net/net.h
@@ -11,6 +11,11 @@
#define MAX_QUEUE_NUM 1024
+/* Maximum GSO packet size (64k) plus plenty of room for
+ * the ethernet and virtio_net headers
+ */
+#define NET_BUFSIZE (4096 + 65536)
+
struct MACAddr {
uint8_t a[6];
};