netdev - Re: [PATCH] mlx4: Use GFP_NOFS calls during the ipoib TX path when creating the QP

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Message-ID: <CAJZOPZJpRYKw7Dskr21QP_d6c7ySS+mi-g_19pNJYm0Gq=ZY+g@mail.gmail.com>
Date:	Wed, 26 Feb 2014 00:20:04 +0200
From:	Or Gerlitz <or.gerlitz@...il.com>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	Roland Dreier <roland@...nel.org>, Amir Vadai <amirv@...lanox.com>,
	Eli Cohen <eli@....mellanox.co.il>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Eugenia Emantayev <eugenia@...lanox.com>,
	"David S. Miller" <davem@...emloft.net>,
	Mel Gorman <mgorman@...e.de>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mlx4: Use GFP_NOFS calls during the ipoib TX path when
 creating the QP

On Wed, Feb 26, 2014 at 12:11 AM, Jiri Kosina <jkosina@...e.cz> wrote:
> On Tue, 25 Feb 2014, Or Gerlitz wrote:

>> And what happens if you use IPoIB datagram mode, is/why the patch is
>> needed there?

> I admittedly am no infiniband expert, but my understanding is that in
> principle Connected/Datagram mode is about MTU and checksum offloading,

yes, the differences between the mode relate to these aspects, however

> but the TX path is the same. Please correct me if I am wrong.

no, note that your patch only touched drivers/infiniband/ulp/ipoib/ipoib_cm.c
which is basically compiled out if you set CONFIG_INFINIBAND_IPOIB_CM,
so surely the TX path for the datagram vs. connected modes are
different.
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