netdev - Re: [PATCH net-next] ptp: dynamic allocation of PHC char devices

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Date:	Wed, 10 Apr 2013 18:37:16 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Jiri Benc <jbenc@...hat.com>
CC:	<netdev@...r.kernel.org>,
	Richard Cochran <richardcochran@...il.com>
Subject: Re: [PATCH net-next] ptp: dynamic allocation of PHC char devices

On Wed, 2013-04-10 at 12:47 +0200, Jiri Benc wrote:
> As network adapters supporting PTP are becoming more common, machines with
> many NICs suddenly have many PHCs, too. The current limit of eight /dev/ptp*
> char devices (and thus, 8 network interfaces with PHC) is insufficient. Let
> the ptp driver allocate the char devices dynamically.
> 
> The character devices are allocated in chunks. idr is used for tracking
> minor numbers allocation; the mapping from index to pointer is not used, as
> it is not needed for posix clocks.
[...]

I don't understand why you want to dynamically allocate chunks of minor
numbers, rather than the full range.  Unused minors don't seem to cost
anything.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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