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

[Kevin Traynor]

On 06/12/2022 00:01, Zhang, Qi Z wrote:
> 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.

Great, can a test also be added to the Intel LTS release validation for 
this?

Looking at the chain of fixes, it appears this issue was present on 
multiple 21.11.x and 20.11.x releases.

> As the patch Cc stable, we can assume it will be captured in 21.11.3 by default.
> 

No, the original commit where the chain of fixes started was not tagged 
with 'Fixes:' so this chain of fixes looked like it was fixing an issue 
that originated in 22.03.

It is applied now and will be part of 21.11.3.

thanks,
Kevin.

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