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+MTU not honored in virtio vnet
+
+I am observing a potential regression/different behavior between rel. 14.04 (dev branch) and release 13.04.
+
+My hardware is: Cisco UCS blade B200-M3 and the network adapter card: Cisco UCS VIC 1240.
+
+lsb_release -rd
+Description:	Ubuntu Trusty Tahr (development branch)
+Release:	14.04
+
+uname -a
+Linux konan2 3.13.0-19-generic #40-Ubuntu SMP Mon Mar 24 02:36:06 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
+
+The problem:
+After starting a kvm with virtio interfaces I am passing HTTP traffic via an external network traffic simulator.
+The tool is sending a TCP packet of 3481B, because the tool MTU is set to 1400B, it splits the packets into 3 TCP segments.
+When the 3 segments are received at the host eth1 interface, the host (ubuntu 14.04) reassembles the TCP packets into a larger packet (GRO), then passes the packet up on vnet1. At this point, because vnet1 MTU is 1500B, it is supposed to re-segment the packet and pass the 3 segments up to the VM. But it passes the big 3481B packet instead.
+
+This behavior did not happen when I tried the same scenario in release 13.04
+
+I can disable this behavior by disabling TSO (TCP segment offloading in the vnet), but I did not have to do this in rel. 13.04 and I feel the MTU is not honored as it should be with rel. 14.04.
+
+ ip link show | grep eth1
+3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq master br1 state UP mode DEFAULT group default qlen 1000
+ ip link show | grep vnet1
+16: vnet1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast master br1 state UNKNOWN mode DEFAULT group default qlen 500
+
+I am attaching two tcpdump/pcap traces that show a TCP transaction passing on vnet1 when TSO is on and when TSO is off.
+
+Please see:
+
+- vnet1_tso_on.pcap
+- vnet1_tso_off.pcap
+
+in attachment.
+
+I noticed there was a driver upgrade in rel. 14.04:
+
+in 14.04:
+
+ethtool -i eth1
+driver: enic
+version: 2.1.1.50  
+firmware-version: 2.1(3a)
+bus-info: 0000:07:00.0
+supports-statistics: yes
+supports-test: no
+supports-eeprom-access: no
+supports-register-dump: no
+supports-priv-flags: no
+
+ethtool -i vnet1
+driver: tun
+version: 1.6
+firmware-version: 
+bus-info: tap
+supports-statistics: no
+supports-test: no
+supports-eeprom-access: no
+supports-register-dump: no
+supports-priv-flags: no
+
+ethtool -k vnet1
+Features for vnet1:
+rx-checksumming: off [fixed]
+tx-checksumming: on
+	tx-checksum-ipv4: off [fixed]
+	tx-checksum-ip-generic: on
+	tx-checksum-ipv6: off [fixed]
+	tx-checksum-fcoe-crc: off [fixed]
+	tx-checksum-sctp: off [fixed]
+scatter-gather: on
+	tx-scatter-gather: on
+	tx-scatter-gather-fraglist: on
+tcp-segmentation-offload: off
+	tx-tcp-segmentation: off
+	tx-tcp-ecn-segmentation: off
+	tx-tcp6-segmentation: off
+udp-fragmentation-offload: on
+generic-segmentation-offload: on
+generic-receive-offload: on
+large-receive-offload: off [fixed]
+rx-vlan-offload: off [fixed]
+tx-vlan-offload: on
+ntuple-filters: off [fixed]
+receive-hashing: off [fixed]
+highdma: off [fixed]
+rx-vlan-filter: off [fixed]
+vlan-challenged: off [fixed]
+tx-lockless: off [fixed]
+netns-local: off [fixed]
+tx-gso-robust: off [fixed]
+tx-fcoe-segmentation: off [fixed]
+tx-gre-segmentation: off [fixed]
+tx-ipip-segmentation: off [fixed]
+tx-sit-segmentation: off [fixed]
+tx-udp_tnl-segmentation: off [fixed]
+tx-mpls-segmentation: off [fixed]
+fcoe-mtu: off [fixed]
+tx-nocache-copy: on
+loopback: off [fixed]
+rx-fcs: off [fixed]
+rx-all: off [fixed]
+tx-vlan-stag-hw-insert: on
+rx-vlan-stag-hw-parse: off [fixed]
+rx-vlan-stag-filter: off [fixed]
+l2-fwd-offload: off [fixed]
+
+
+
+in 13.04 :
+
+ethtool -i eth1
+driver: enic
+version: 2.1.1.39
+firmware-version: 2.1(3a)
+bus-info: 0000:07:00.0
+supports-statistics: yes
+supports-test: no
+supports-eeprom-access: no
+supports-register-dump: no
+supports-priv-flags: no
+
+
+ethtool -i vnet1
+driver: tun
+version: 1.6
+firmware-version: 
+bus-info: tap
+supports-statistics: no
+supports-test: no
+supports-eeprom-access: no
+supports-register-dump: no
+supports-priv-flags: no
+
+
+ethtool -k vnet1
+Features for vnet1:
+rx-checksumming: off [fixed]
+tx-checksumming: on
+	tx-checksum-ipv4: off [fixed]
+	tx-checksum-ip-generic: on
+	tx-checksum-ipv6: off [fixed]
+	tx-checksum-fcoe-crc: off [fixed]
+	tx-checksum-sctp: off [fixed]
+scatter-gather: on
+	tx-scatter-gather: on
+	tx-scatter-gather-fraglist: on
+tcp-segmentation-offload: on
+	tx-tcp-segmentation: on
+	tx-tcp-ecn-segmentation: on
+	tx-tcp6-segmentation: on
+udp-fragmentation-offload: on
+generic-segmentation-offload: on
+generic-receive-offload: on
+large-receive-offload: off [fixed]
+rx-vlan-offload: off [fixed]
+tx-vlan-offload: off [fixed]
+ntuple-filters: off [fixed]
+receive-hashing: off [fixed]
+highdma: off [fixed]
+rx-vlan-filter: off [fixed]
+vlan-challenged: off [fixed]
+tx-lockless: off [fixed]
+netns-local: off [fixed]
+tx-gso-robust: off [fixed]
+tx-fcoe-segmentation: off [fixed]
+fcoe-mtu: off [fixed]
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