[Bug 263229] virtio vtnet driver with rxcsum errors

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=263229

Danilo Egea Gondolfo <danilo@FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |danilo@FreeBSD.org

--- Comment #2 from Danilo Egea Gondolfo <danilo@FreeBSD.org> ---
I'm having the same issue on FreeBSD 15 running on LXD (qemu/kvm).

In my case DHCP fails with the error below. Disabling RXCSUM makes it work
immediately.

vtnet0: flags=1008802<BROADCAST,SIMPLEX,MULTICAST,LOWER_UP> metric 0 mtu 1500
       
options=4c07bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,LRO,VLAN_HWTSO,LINKSTATE,TXCSUM_IPV6>
        ether 00:16:3e:e2:a7:60
        media: Ethernet autoselect (10Gbase-T <full-duplex>)
        status: active
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
lo0: flags=1008049<UP,LOOPBACK,RUNNING,MULTICAST,LOWER_UP> metric 0 mtu 16384
        options=680003<RXCSUM,TXCSUM,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
        inet 127.0.0.1 netmask 0xff000000
        inet6 ::1 prefixlen 128
        inet6 fe80::1%lo0 prefixlen 64 scopeid 0x2
        groups: lo
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
root@:/mnt/root # dhclient vtnet0
DHCPDISCOVER on vtnet0 to 255.255.255.255 port 67 interval 4
DHCPDISCOVER on vtnet0 to 255.255.255.255 port 67 interval 6
DHCPDISCOVER on vtnet0 to 255.255.255.255 port 67 interval 9
DHCPDISCOVER on vtnet0 to 255.255.255.255 port 67 interval 9
DHCPDISCOVER on vtnet0 to 255.255.255.255 port 67 interval 13
5 bad udp checksums in 5 packets
DHCPDISCOVER on vtnet0 to 255.255.255.255 port 67 interval 13
^C
root@:/mnt/root # ifconfig vtnet0 -rxcsum
root@:/mnt/root # dhclient vtnet0
DHCPDISCOVER on vtnet0 to 255.255.255.255 port 67 interval 3
DHCPOFFER from 10.86.126.1
DHCPREQUEST on vtnet0 to 255.255.255.255 port 67
DHCPACK from 10.86.126.1
bound to 10.86.126.96 -- renewal in 1800 seconds.

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