Re: [PATCH for-next] RDMA/efa: Validate SQ depth based on WQE size

[Leon Romanovsky <leon@kernel.org>]

On Wed, May 13, 2026 at 07:24:51PM +0000, Yonatan Nachum wrote:
> On Wed, May 13, 2026 at 08:38:12PM +0300, Leon Romanovsky wrote:
> > On Thu, May 07, 2026 at 11:21:10AM +0000, Yonatan Nachum wrote:
> > > From: Michael Margolin <mrgolin@amazon.com>
> > > 
> > > Change the SQ depth validation to take into account the SQ WQE size.
> > > This is needed since when using 128-byte WQE the max SQ depth is cut in
> > > half. On create QP command, userspace provides SQ ring size which is SQ
> > > depth X WQE size so we can calculate the requested WQE size in the
> > > kernel.
> > > 
> > > Reviewed-by: Daniel Kranzdorf <dkkranzd@amazon.com>
> > > Reviewed-by: Michael Margolin <mrgolin@amazon.com>
> > > Signed-off-by: Yonatan Nachum <ynachum@amazon.com>
> > > ---
> > >  drivers/infiniband/hw/efa/efa_verbs.c | 39 ++++++++++++++++++---------
> > >  1 file changed, 27 insertions(+), 12 deletions(-)
> > 
> > Please add Fixes line.
> > 
> > Thanks
> 
> There is no Fixes tag as this is not a bug fix. The existing validation
> works but is overly permissive — it doesn't account for WQE size when
> checking max SQ depth. Without it, the device would reject the request
> downstream. This patch tightens the validation to fail early in the
> kernel.

So why do we need kernel patch after all?

Thanks