linux-kernel - Re: [PATCH] IB/core: Make ib_mad_client

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Message-ID: <20180430144930.GB26895@ziepe.ca>
Date:   Mon, 30 Apr 2018 08:49:30 -0600
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     jackm <jackm@....mellanox.co.il>
Cc:     Håkon Bugge <haakon.bugge@...cle.com>,
        Doug Ledford <dledford@...hat.com>,
        Don Hiatt <don.hiatt@...el.com>,
        Dasaratharaman Chandramouli 
        <dasaratharaman.chandramouli@...el.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Sean Hefty <sean.hefty@...el.com>,
        OFED mailing list <linux-rdma@...r.kernel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] IB/core: Make ib_mad_client_id atomic

On Mon, Apr 23, 2018 at 10:16:18PM +0300, jackm wrote:

> > > TIDs need to be globally unique on the entire machine.  

> Jason, that is not exactly correct.

The expecation for /dev/umad users is that they all receive locally
unique TID prefixes. The kernel may be OK to keep things port-specific
but it is slightly breaking the API we are presenting to userspace to
allow them to alias..

Jason