netdev - RE: [Intel-wired-lan] [PATCH RFC net] igb: Fix XDP with PTP enabled

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Date:   Wed, 2 Jun 2021 10:49:15 +0000
From:   "Penigalapati, Sandeep" <sandeep.penigalapati@...el.com>
To:     Kurt Kanzenbach <kurt@...utronix.de>,
        "Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
        "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        "Jakub Kicinski" <kuba@...nel.org>
CC:     Jesper Dangaard Brouer <hawk@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Alexei Starovoitov <ast@...nel.org>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        Lorenzo Bianconi <lorenzo@...nel.org>
Subject: RE: [Intel-wired-lan] [PATCH RFC net] igb: Fix XDP with PTP enabled

>-----Original Message-----
>From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf Of
>Kurt Kanzenbach
>Sent: Monday, April 12, 2021 3:47 PM
>To: Brandeburg, Jesse <jesse.brandeburg@...el.com>; Nguyen, Anthony L
><anthony.l.nguyen@...el.com>; David S. Miller <davem@...emloft.net>;
>Jakub Kicinski <kuba@...nel.org>
>Cc: Kurt Kanzenbach <kurt@...utronix.de>; Jesper Dangaard Brouer
><hawk@...nel.org>; Daniel Borkmann <daniel@...earbox.net>;
>netdev@...r.kernel.org; Sebastian Andrzej Siewior <bigeasy@...utronix.de>;
>Ilias Apalodimas <ilias.apalodimas@...aro.org>; Alexei Starovoitov
><ast@...nel.org>; intel-wired-lan@...ts.osuosl.org; bpf@...r.kernel.org;
>Lorenzo Bianconi <lorenzo@...nel.org>
>Subject: [Intel-wired-lan] [PATCH RFC net] igb: Fix XDP with PTP enabled
>
>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.
>
>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 | 45 ++++++++++++-----------
>drivers/net/ethernet/intel/igb/igb_ptp.c  | 18 ++++-----
> 3 files changed, 32 insertions(+), 34 deletions(-)
>
Tested-by: Sandeep Penigalapati <sandeep.penigalapati@...el.com>