[PATCH] net/i40e: fix X722 NIC receives jumbo frame packets

[Zhang, Qi Z]

Hi David:

> -----Original Message-----
> From: David Marchand <david.marchand at redhat.com>
> Sent: Monday, December 5, 2022 7:15 PM
> To: Kevin Traynor <ktraynor at redhat.com>; Zhang, Qi Z
> <qi.z.zhang at intel.com>
> Cc: stable at dpdk.org; Yuan, DukaiX <dukaix.yuan at intel.com>; Wang, Jie1X
> <jie1x.wang at intel.com>; dev at dpdk.org; Yang, SteveX
> <stevex.yang at intel.com>; Yang, Qiming <qiming.yang at intel.com>; Xing,
> Beilei <beilei.xing at intel.com>; Zhang, Yuying <yuying.zhang at intel.com>
> Subject: Re: [PATCH] net/i40e: fix X722 NIC receives jumbo frame packets
> 
> Hi Kevin, Qi,
> 
> On Thu, Nov 10, 2022 at 10:48 AM Zhang, Qi Z <qi.z.zhang at intel.com>
> wrote:
> > > > Subject: [PATCH] net/i40e: fix X722 NIC receives jumbo frame
> > > > packets
> > > >
> > > > For NIC I40E_10G-10G_BASE_T_X722, when the port is configured with
> > > > link speed, it cannot receive jumbo frame packets.
> > > >
> > > > Because it set maximum frame size failed when starts the port that
> > > > the port link status is still down.
> > > >
> > > > This patch fix the error that starts the port will force set
> > > > maximum frame
> > > size.
> > > >
> > > > Fixes: 2184f7cdeeaa ("net/i40e: fix max frame size config at port
> > > > level")
> > > > Cc: stable at dpdk.org
> > > >
> > > > Signed-off-by: Jie Wang <jie1x.wang at intel.com>
> 
> It seems this fix has been missed in 21.11 (for the reason we discussed with
> Kevin offlist).
> 
> Our QE reported that reception of jumbo frames seems broken in the 21.11
> branch.
> 
> I can reproduce with a X710 nic: v21.11.0 is fine, but v21.11.1 and
> v21.11.2 show the following error log.
> Dec 05 05:41:37 xxx ovs-vswitchd[53585]:
> ovs|00183|dpdk|ERR|i40e_set_mac_max_frame(): Set max frame size at
> port level not applicable on link down
> 
> The log goes away with backporting this current patch.
> Can this be added to 21.11 queue, and have Intel validate this issue?

Yes, the patch has been verified on X722.
As the patch Cc stable, we can assume it will be captured in 21.11.3 by default.

> 
> Thanks!
> 
> 
> --
> David Marchand