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

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Message-ID: <20250911073630.14cd6764@kernel.org>
Date: Thu, 11 Sep 2025 07:36:30 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: 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 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