linux-kernel - Re: [PATCH v2 1/8] ib_mad: incoming sminfo SMPs gets discarded if no process

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Date:   Fri, 16 Sep 2016 22:40:31 +0200
From:   Knut Omang <knut.omang@...cle.com>
To:     Santosh Shilimkar <santosh.shilimkar@...cle.com>,
        Doug Ledford <dledford@...hat.com>
Cc:     linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        Sean Hefty <sean.hefty@...el.com>,
        Hal Rosenstock <hal.rosenstock@...il.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Christoph Hellwig <hch@...radead.org>,
        Bart Van Assche <bart.vanassche@...disk.com>,
        Dag Moxnes <dag.moxnes@...cle.com>,
        Mark Bloch <markb@...lanox.com>,
        Dean Luick <dean.luick@...el.com>
Subject: Re: [PATCH v2 1/8] ib_mad: incoming sminfo SMPs gets discarded if
 no process_mad function is registered

On Fri, 2016-09-16 at 13:28 -0700, Santosh Shilimkar wrote:
> On 9/16/2016 11:31 AM, Knut Omang wrote:
> > From: Dag Moxnes <dag.moxnes@...cle.com>
> >
> > The process_mad function is an optional IB driver entry point
> > allows a driver to intercept or modify MAD traffic.
> >
> > This fix allows MAD traffic to flow down to the device also
> > when MAD traffic is completely handled by the device and
> > no process_mad function is provided.
> >
> > SIF, the new Oracle Infiniband HCA, is the first HCA
> > where the device itself makes all decision wrt MAD processing.
> > Up till now devices either supports MAD, and do then
> > implement the process_mad entry point, or do not
> > support MAD at all, and then do not implement process_mad.
> >
> > SIF introduces a 3rd case: Supports MAD
> > but do not terminate any MAD requests in the driver.
> > This case is not handled well by the current code.
> >
> > The problem is that the handle_outgoing_dr_smp function
> > has an implicit assumption that some packets are handled
> > by the process_mad function itself.
> >
> > There is no way to provide return values from the process_mad
> > function that ensures that packets are always forwarded to the device,
> > so the only viable solution without breaking the API
> > seems to be to not implement process_mad.
> 
> No SOBs ?

is unfortunately recurring for several of the patches due to a missing -ns to format-patch.
Will fix,

Thanks,
Knut