Choice of private ioctl approach

[Andrew Rybchenko]

Hello,

we need to add private ioctl to the driver sfxge(4) to make FW update,
do internal diagnostics commands etc.
We see at least two approaches in other drivers:
  1. SIOCGPRIVATE_0/ SIOCGPRIVATE_1 on net device
  2. dedicated char device with its own ioctl's

Is there any recommendations on which way is preferred?

Thanks,
Andrew.
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