[ovs-discuss] OpenvSwitch Message too large

[Flavio Leitner]

Perhaps the interface creating the packet has the wrong MTU?
For instance, a VM is using MTU 1500 but then packets gets
encapsulated?

fbl

On Mon, Oct 19, 2020 at 09:59:13PM +0700, KhacThuan Bk wrote:
>  Hi all,
> 
> I'm using ovs with bonding interface. All interface is using mtu 1500.
> But in ovs-vswitchd.log i saw some log about "Message too long". I cannot
> use ovs-tcpdump to trace message. Any one used face this problem can tell
> my what is problem. I have some info follow this.
> 
> less /var/log/openvswitch/ovs-vswitchd.log
> 2020-10-16T10:26:34.876Z|5804855|dpif_netdev|ERR|error receiving data from
> bond0: Message too long
> 2020-10-16T10:26:34.883Z|5804856|dpif_netdev|ERR|error receiving data from
> bond0: Message too long
> 2020-10-16T10:26:34.888Z|5804857|dpif_netdev|ERR|error receiving data from
> bond0: Message too long
> 2020-10-16T10:26:34.888Z|5804858|dpif_netdev|ERR|error receiving data from
> bond0: Message too long
> 2020-10-16T10:26:34.888Z|5804859|dpif_netdev|ERR|error receiving data from
> bond0: Message too long
> 2020-10-16T10:26:34.936Z|5804860|dpif_netdev|ERR|error receiving data from
> bond0: Message too long
> 2020-10-16T10:26:34.936Z|5804861|dpif_netdev|ERR|error receiving data from
> bond0: Message too long
> 2020-10-16T10:26:34.936Z|5804862|dpif_netdev|ERR|error receiving data from
> bond0: Message too long
> 2020-10-16T10:26:34.947Z|5804863|dpif_netdev|ERR|error receiving data from
> bond0: Message too long
> 2020-10-16T10:26:35.179Z|5804864|dpif_netdev|ERR|error receiving data from
> bond0: Message too long
> 
> 
> [root at host1 ~]# ovs-vsctl show
> a861ee0a-595a-462a-8729-68de6a9026d8
>     Manager "ptcp:6640:127.0.0.1"
>         is_connected: true
>     Bridge br0
>         Controller "tcp:127.0.0.1:6633"
>             is_connected: true
>         fail_mode: secure
>         datapath_type: netdev
>         Port phy-br0
>             Interface phy-br0
>                 type: patch
>                 options: {peer=int-br0}
>         Port "bond0"
>             Interface "bond0"
>         Port br0
>             Interface br0
>                 type: internal
> 
> [root at host1 ~]# ip link show bond0
> 10: bond0: <BROADCAST,MULTICAST,PROMISC,MASTER,UP,LOWER_UP> mtu 1500 qdisc
> noqueue state UP mode DEFAULT group default qlen 1000
>     link/ether e4:43:4b:ed:33:20 brd ff:ff:ff:ff:ff:ff
> 
> [root at host1 ~]# ovs-vsctl list interface bond0
> _uuid               : 89181c9b-f123-48fb-97ed-3252e39f41ce
> admin_state         : up
> bfd                 : {}
> bfd_status          : {}
> cfm_fault           : []
> cfm_fault_status    : []
> cfm_flap_count      : []
> cfm_health          : []
> cfm_mpid            : []
> cfm_remote_mpids    : []
> cfm_remote_opstate  : []
> duplex              : []
> error               : []
> external_ids        : {}
> ifindex             : 10
> ingress_policing_burst: 0
> ingress_policing_rate: 0
> lacp_current        : []
> link_resets         : 0
> link_speed          : []
> link_state          : up
> lldp                : {}
> mac                 : []
> mac_in_use          : "e4:43:4b:ed:33:20"
> mtu                 : 1500
> mtu_request         : 1500
> name                : "bond0"
> ofport              : 3
> ofport_request      : []
> options             : {}
> other_config        : {}
> statistics          : {collisions=0, rx_bytes=428325175126, rx_crc_err=0,
> rx_dropped=3644084274, rx_errors=0, rx_frame_err=0, rx_over_err=0,
> rx_packets=2667110862, tx_bytes=345128207711, tx_dropped=0, tx_errors=0,
> tx_packets=563989135}
> status              : {driver_name=bonding, driver_version="3.7.1",
> firmware_version="2"}
> type                : ""
> 
> [root at host2 ~]# ovs-vsctl list interface br0
> _uuid               : c3df3fc1-b78d-464f-af39-1fee5aff12dc
> admin_state         : down
> bfd                 : {}
> bfd_status          : {}
> cfm_fault           : []
> cfm_fault_status    : []
> cfm_flap_count      : []
> cfm_health          : []
> cfm_mpid            : []
> cfm_remote_mpids    : []
> cfm_remote_opstate  : []
> duplex              : full
> error               : []
> external_ids        : {}
> ifindex             : 24
> ingress_policing_burst: 0
> ingress_policing_rate: 0
> lacp_current        : []
> link_resets         : 0
> link_speed          : 10000000
> link_state          : down
> lldp                : {}
> mac                 : []
> mac_in_use          : "e4:43:4b:ec:c5:60"
> mtu                 : 1500
> mtu_request         : []
> name                : br0
> ofport              : 65534
> ofport_request      : []
> options             : {}
> other_config        : {}
> statistics          : {collisions=0, rx_bytes=0, rx_crc_err=0,
> rx_dropped=0, rx_errors=0, rx_frame_err=0, rx_over_err=0, rx_packets=0,
> tx_bytes=0, tx_dropped=1000184, tx_errors=0, tx_packets=0}
> status              : {driver_name=tun, driver_version="1.6",
> firmware_version=""}
> type                : internal

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-- 
fbl