linux-kernel - Re: [PATCH net V2 10/11] net/mlx5e: Update and set Xon/Xoff upon port speed set

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Message-ID: <af70c86b-2345-4403-9078-be5c8ef0886f@gmail.com>
Date: Mon, 15 Sep 2025 10:38:39 +0300
From: Tariq Toukan <ttoukan.linux@...il.com>
To: Jakub Kicinski <kuba@...nel.org>, Mark Bloch <mbloch@...dia.com>
Cc: Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>,
 Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller"
 <davem@...emloft.net>, Tariq Toukan <tariqt@...dia.com>,
 Leon Romanovsky <leon@...nel.org>, Saeed Mahameed <saeedm@...dia.com>,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 Gal Pressman <gal@...dia.com>, linux-rdma@...r.kernel.org,
 Alexei Lazar <alazar@...dia.com>
Subject: Re: [PATCH net V2 10/11] net/mlx5e: Update and set Xon/Xoff upon port
 speed set

On 11/09/2025 17:36, Jakub Kicinski wrote:
> On Thu, 11 Sep 2025 17:25:22 +0300 Mark Bloch wrote:
>> On 11/09/2025 16:47, Jakub Kicinski wrote:
>>> On Wed, 10 Sep 2025 17:00:11 -0700 Jakub Kicinski wrote:
>>>> Hi, this is breaking dual host CX7 w/ 28.45.1300 (but I think most
>>>> older FW versions, too). Looks like the host is not receiving any
>>>> mcast (ping within a subnet doesn't work because the host receives
>>>> no ndisc), and most traffic slows down to a trickle.
>>>> Lost of rx_prio0_buf_discard increments.
>>>>
>>>> Please TAL ASAP, this change went to LTS last week.
>>>
>>> Any news on this? I heard that it also breaks DCB/QoS configuration
>>> on 6.12.45 LTS.
>>
>> We are looking into this, once we have anything I'll update.
>> Just to make sure, reverting this is one commit solves the
>> issue you are seeing?
> 
> It did for me, but Daniel (who is working on the PSP series)
> mentioned that he had reverted all three to get net-next working:
> 
>    net/mlx5e: Set local Xoff after FW update
>    net/mlx5e: Update and set Xon/Xoff upon port speed set
>    net/mlx5e: Update and set Xon/Xoff upon MTU set
> 

Hi Jakub,

Thanks for reporting.
We're investigating and will update soon.

Regards,
Tariq