On Fri, Oct 28, 2016 at 5:46 PM, Leon Romanovsky <leonro@xxxxxxxxxxxx> wrote:
> On Fri, Oct 28, 2016 at 08:37:25AM -0700, Christoph Hellwig wrote:
>> On Fri, Oct 28, 2016 at 06:33:06PM +0300, Leon Romanovsky wrote:
>> > Just to summarize, to be sure that I understood you correctly.
>> >
>> > --------- --------------------
>> > | write | -> | conversion logic | ---
>> > --------- -------------------- | ----------------------
>> > -----> | internal interface |
>> > --------- | ----------------------
>> > | ioctl | ---------------------------
>> > ---------
>> >
>> > Am I right?
>>
>> Yes, as long as the write and ioctl boxes do the copy_{from,to}_user.
>
> Thanks
>
If we accept the limitations here (i.e - all commands attributes come
either from kernel or from user,
but you can't mix them - that's mean the write comparability layer
either needs to copy all attributes
or use a direct mapping for all of them), I could just either break
ib_uverbs_cmd_verbs to a a few functions
or just pass a callback of boxing the descriptors copy.
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