Re: [PATCH net-next 1/2] smc: convert to getsockopt_iter

[Breno Leitao <leitao@debian.org>]

On Fri, Jun 05, 2026 at 05:13:25AM -0700, Breno Leitao wrote:
> Convert SMC socket's getsockopt implementation to use the new
> getsockopt_iter callback with sockopt_t.
> 
> Key changes:
> - Replace (char __user *optval, int __user *optlen) with sockopt_t *opt
> - Use opt->optlen for buffer length (input) and returned size (output)
> - Use copy_to_iter() instead of put_user()/copy_to_user()
> - Add linux/uio.h for copy_to_iter()
> 
> SMC is a proxy socket: only the SOL_SMC level is handled locally, while
> all other levels are forwarded to the underlying CLC (TCP) socket. That
> socket's getsockopt() still operates on __user buffers, so the
> pass-through is limited to user-backed iters: optval is reconstructed
> from iter_out, the original optlen pointer (preserved in sockopt_t) is
> forwarded, and the length reported by the clcsock is mirrored back into
> opt->optlen so the core writes the correct value to userspace.
> 
> Signed-off-by: Breno Leitao <leitao@debian.org>

Damn, this is not building. let me send a fixed version (v2).

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