Subject: Re: [PATCH net] igb: Fix XDP with PTP enabled

From: Kurt Kanzenbach <[email-masked]>
Date: Thu, 15 Apr 2021 14:16:36 +0200

On Thu Apr 15 2021, Jesper Dangaard Brouer wrote:
> On Thu, 15 Apr 2021 11:21:45 +0200
> Kurt Kanzenbach <[email-masked]> 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,
Kurt