linux-kernel - Re: [PATCH 2/2] IB/mad: Use IDR for agent IDs

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Message-ID: <20180610122505.GM12407@mtr-leonro.mtl.com>
Date:   Sun, 10 Jun 2018 15:25:05 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     hans.westgaard.ry@...cle.com, Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Matthew Wilcox <mawilcox@...rosoft.com>,
        linux-rdma@...r.kernel.org,
        Håkon Bugge <haakon.bugge@...cle.com>,
        Parav Pandit <parav@...lanox.com>,
        Jack Morgenstein <jackm@....mellanox.co.il>,
        Pravin Shedge <pravin.shedge4linux@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] IB/mad: Use IDR for agent IDs

On Sun, Jun 10, 2018 at 03:43:05AM -0700, Matthew Wilcox wrote:
> On Sun, Jun 10, 2018 at 09:30:28AM +0300, Leon Romanovsky wrote:
> > 1. IBTA spec doesn't talk at all about the size of TransactionID, more
> > on that in section "13.4.6.4 TRANSACTION ID USAGE", the specification
> > says: "The contents of the TransactionID (TID) field are implementation-
> > dependent. So let's don't call it mlx4 bug.
>
> I was loosely paraphrasing the original bug report; suggested rewording
> of the comments gratefully accepted.

Just replace "mlx4 bug" with something like "to comply with mlx4
implementation".

>
> > 2. The current implementation means that in mlx5-only network we will
> > still have upto (1 << 24) TIDs. I don't know if it is really important,
> > but worth to mention.
>
> Actually, the TIDs will be up to 2^56.  We're limited to 2^24 clients,
> each of which can send up to 2^32 messages.

It sounds like more than enough.

Thanks

>

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