netdev - Re: [PATCH] IB/ipoib: move back the IB LL address into the hard header

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Message-ID: <20161011182709.GA20253@obsidianresearch.com>
Date:   Tue, 11 Oct 2016 12:27:09 -0600
From:   Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:     Paolo Abeni <pabeni@...hat.com>
Cc:     Doug Ledford <dledford@...hat.com>, linux-rdma@...r.kernel.org,
        Sean Hefty <sean.hefty@...el.com>,
        Hal Rosenstock <hal.rosenstock@...il.com>,
        netdev@...r.kernel.org
Subject: Re: [PATCH] IB/ipoib: move back the IB LL address into the hard
 header

On Tue, Oct 11, 2016 at 08:10:07PM +0200, Paolo Abeni wrote:

> The first s/g fragment (the head buffer) is not allocated with the page
> allocator, so perhaps there is some not too difficult/costly way out of
> this.

Keep in mind, there is nothing magic about the 16 SGL limit, other
than we know all hardware supports it. That can be bumped up and most
hardware will support a higher value.

We'd just have to figure out if any hardware breaks, Mellanox and Intel
should be able to respond to that question.

Jason