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

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Message-ID: <20210415140438.60221f21@carbon>
Date:   Thu, 15 Apr 2021 14:04:38 +0200
From:   Jesper Dangaard Brouer <jbrouer@...hat.com>
To:     Kurt Kanzenbach <kurt@...utronix.de>
Cc:     Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Sven Auhagen <sven.auhagen@...eatech.de>,
        intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Richard Cochran <richardcochran@...il.com>
Subject: Re: [PATCH net] igb: Fix XDP with PTP enabled

On Thu, 15 Apr 2021 11:21:45 +0200
Kurt Kanzenbach <kurt@...utronix.de> 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.


> Fixes: 9cbc948b5a20 ("igb: add XDP support")
> Signed-off-by: Kurt Kanzenbach <kurt@...utronix.de>
> ---
[...]
> 
> drivers/net/ethernet/intel/igb/igb.h      |  3 +-
>  drivers/net/ethernet/intel/igb/igb_main.c | 46 ++++++++++++-----------
>  drivers/net/ethernet/intel/igb/igb_ptp.c  | 21 ++++-------
>  3 files changed, 33 insertions(+), 37 deletions(-)

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer