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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