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

Jakub Kicinski
2025-09-11T14:36:32Z

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