On Thu, 15 Apr 2021 14:16:36 +0200 Kurt Kanzenbach <kurt@xxxxxxxxxxxxx> wrote: > On Thu Apr 15 2021, Jesper Dangaard Brouer wrote: > > On Thu, 15 Apr 2021 11:21:45 +0200 > > Kurt Kanzenbach <kurt@xxxxxxxxxxxxx> wrote: > > > >> When using native XDP with the igb driver, the XDP frame data doesn't point to > >> the beginning of the packet. It's off by 16 bytes. Everything works as expected > >> with XDP skb mode. > >> > >> Actually these 16 bytes are used to store the packet timestamps. Therefore, pull > >> the timestamp before executing any XDP operations and adjust all other code > >> accordingly. The igc driver does it like that as well. > >> > >> Tested with Intel i210 card and AF_XDP sockets. > > > > Doesn't the i210 card use the igc driver? > > This change is for igb driver. > > Nope. igb is for i210 and igc is for the newer Intel i225 NICs. > > |01:00.0 Ethernet controller: Intel Corporation I210 Gigabit Network Connection (rev 03) > |[...] > | Kernel driver in use: igb > | Kernel modules: igb Thanks a lot for correcting me! I have a project involving i225+igc (using TSN). And someone suggested that I also looked at i210 for TSN. I've ordered hardware that have i210 on motherboard (and I will insert my i225 card) so I have a system with both chips for experimenting with TSN. I guess, I would have discovered this eventually when I got the hardware. Thanks for saving me from this mistake. Thanks! -- Best regards, Jesper Dangaard Brouer MSc.CS, Principal Kernel Engineer at Red Hat LinkedIn: http://www.linkedin.com/in/brouer
