linux-kernel - Re: infiniband limit of 32 cards per system?

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Message-ID: <adaaaw1pl5d.fsf@roland-alpha.cisco.com>
Date:	Mon, 25 Jan 2010 20:03:58 -0800
From:	Roland Dreier <rdreier@...co.com>
To:	Alex Chiang <achiang@...com>
Cc:	linux-rdma@...r.kernel.org, justin.chen@...com,
	linux-kernel@...r.kernel.org
Subject: Re: infiniband limit of 32 cards per system?

 > I'm guessing that it's not just a simple kernel fix though since
 > OFED has to change too, right?

Dunno about OFED.  Nothing sane is hard-coding major/minor numbers
though -- so I think OFED should be OK, asuming there are no crazy
scripts that bypass udev creating device nodes etc.

I don't think that it's _totally_ trivial in the kernel -- we do need to
add some code in several places to allocate dynamic device numbers when
we run out of the static allocation (probably best to keep the legacy
device numbers for "small" < 32 adapter systems, since there may be
really small systems with static hard-coded /dev etc).

 - R.

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