OK Thanks for the answer. I will create a ticket. Found that the option `vxlanhwcsum` is the culprit.
Benoît On Tuesday, December 5th, 2023 at 15:24, Kristof Provost <k...@freebsd.org> wrote: > On 5 Dec 2023, at 15:21, Benoit Chesneau wrote: > > > Changing the mtu wasn't enough. To make it works i had to disable vxlan > > offload features: > > > > `ifconfig mce0 -vxlanhwcsum -vxlanhwtso` > > > > Then suddenly all started to work. The card is the following: > > > > `mlx5_core1@pci0:17:0:1: class=0x020000 rev=0x00 hdr=0x00 vendor=0x15b3 > > device=0x1015 subvendor=0x1590 subdevice=0x00d4 vendor = 'Mellanox > > Technologies' device = 'MT27710 Family [ConnectX-4 Lx]' class = network > > subclass = ethernet PCI-e errors = Correctable Error Detected Unsupported > > Request Detected Corrected = Advisory Non-Fatal Error` > > > > Which is odd. Wonder why it's needed. Thoughts? > > Driver bug? > > I’m not familiar with the mlx5 driver (or hardware), but that’d be my guess. > The first step in debugging that would be to figure out which one of those > offload features is responsible, and probably also capturing traffic (outside > of this machine) to see if anything is sent and if so how it’s broken. > > Best regards, > Kristof
