On 05/24/2016 04:54 PM, Jason Gunthorpe wrote:
> On Tue, May 24, 2016 at 08:29:41PM +0000, Hefty, Sean wrote:
>>> Let's assume that you are planning to provide block of 20 ioctls per
>>> device. Right now, there are 10 (or 8 if we count driver families) drivers in
>>> drivers/infiniband/hw/ + 1 is coming (HSI) + uverbs (approximately 40)
>>> => 8 * 20 + 20 + 40 = 220 ioctls => we already in shortage without room
>>> to expansion.
>>
>> Ioctl commands are naturally scoped per open file. Unless the
>> opened file supports ioctls directed to every piece of hardware, I
>> don't see why there's an obsession with command space.
>
> The kernel standard is to have ioctl numbers be globally unique, even
> though technically you are right and they are scoped to a file.
A not very well followed standard...
--
Doug Ledford <dledford@xxxxxxxxxx>
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