netdev - RE: [Intel-wired-lan] [PATCH net v4 1/3] ixgbe: allow to increase MTU to 3K with XDP enabled

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Message-ID: <MN2PR11MB40459B16A67226F780FE76D7EAA29@MN2PR11MB4045.namprd11.prod.outlook.com>
Date:   Tue, 14 Feb 2023 02:23:20 +0000
From:   "Rout, ChandanX" <chandanx.rout@...el.com>
To:     Jason Xing <kerneljasonxing@...il.com>,
        "Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
        "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "richardcochran@...il.com" <richardcochran@...il.com>,
        "ast@...nel.org" <ast@...nel.org>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        "hawk@...nel.org" <hawk@...nel.org>,
        "john.fastabend@...il.com" <john.fastabend@...il.com>,
        "Lobakin, Alexandr" <alexandr.lobakin@...el.com>,
        "Fijalkowski, Maciej" <maciej.fijalkowski@...el.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        Jason Xing <kernelxing@...cent.com>,
        "Kuruvinakunnel, George" <george.kuruvinakunnel@...el.com>,
        "Nagaraju, Shwetha" <shwetha.nagaraju@...el.com>,
        "Nagraj, Shravan" <shravan.nagraj@...el.com>
Subject: RE: [Intel-wired-lan] [PATCH net v4 1/3] ixgbe: allow to increase MTU
 to 3K with XDP enabled



>-----Original Message-----
>From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf Of
>Jason Xing
>Sent: 08 February 2023 08:14
>To: Brandeburg, Jesse <jesse.brandeburg@...el.com>; Nguyen, Anthony L
><anthony.l.nguyen@...el.com>; davem@...emloft.net;
>edumazet@...gle.com; kuba@...nel.org; pabeni@...hat.com;
>richardcochran@...il.com; ast@...nel.org; daniel@...earbox.net;
>hawk@...nel.org; john.fastabend@...il.com; Lobakin, Alexandr
><alexandr.lobakin@...el.com>; Fijalkowski, Maciej
><maciej.fijalkowski@...el.com>
>Cc: kerneljasonxing@...il.com; netdev@...r.kernel.org; linux-
>kernel@...r.kernel.org; intel-wired-lan@...ts.osuosl.org;
>bpf@...r.kernel.org; Jason Xing <kernelxing@...cent.com>
>Subject: [Intel-wired-lan] [PATCH net v4 1/3] ixgbe: allow to increase MTU to
>3K with XDP enabled
>
>From: Jason Xing <kernelxing@...cent.com>
>
>Recently I encountered one case where I cannot increase the MTU size
>directly from 1500 to a much bigger value with XDP enabled if the server is
>equipped with IXGBE card, which happened on thousands of servers in
>production environment. After appling the current patch, we can set the
>maximum MTU size to 3K.
>
>This patch follows the behavior of changing MTU as i40e/ice does.
>
>Referrences:
>[1] commit 23b44513c3e6 ("ice: allow 3k MTU for XDP") [2] commit
>0c8493d90b6b ("i40e: add XDP support for pass and drop actions")
>
>Fixes: fabf1bce103a ("ixgbe: Prevent unsupported configurations with XDP")
>Signed-off-by: Jason Xing <kernelxing@...cent.com>
>---
>v4:
>1) use ':' instead of '-' for kdoc
>
>v3:
>1) modify the titile and body message.
>
>v2:
>1) change the commit message.
>2) modify the logic when changing MTU size suggested by Maciej and
>Alexander.
>---
> drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 25 ++++++++++++-------
> 1 file changed, 16 insertions(+), 9 deletions(-)
>

Tested-by: Chandan Kumar Rout <chandanx.rout@...el.com> (A Contingent Worker at Intel)