Re: [PATCH net-next 2/2] net/smc: Add documentation for limit_smc_hs and hs_ctrl

["D. Wythe" <alibuda@linux.alibaba.com >]

On Thu, Mar 05, 2026 at 06:22:24PM +0900, sawara04.o@gmail.com wrote:
> From: Kyoji Ogasawara <sawara04.o@gmail.com>
> 
> Document missing SMC sysctl parameters limit_smc_hs and hs_ctrl
> 
> Signed-off-by: Kyoji Ogasawara <sawara04.o@gmail.com>
> ---
>  Documentation/networking/smc-sysctl.rst | 24 ++++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
> 
> diff --git a/Documentation/networking/smc-sysctl.rst b/Documentation/networking/smc-sysctl.rst
> index 17b8314c0e5e..67c2bdc533d7 100644
> --- a/Documentation/networking/smc-sysctl.rst
> +++ b/Documentation/networking/smc-sysctl.rst
> @@ -111,3 +111,27 @@ smcr_max_recv_wr - INTEGER
>  	like before having this control.
>  
>  	Default: 48
> +
> +limit_smc_hs - INTEGER
> +	Whether to limit SMC handshake for newly created sockets.
> +
> +	When enabled, SMC listen path applies handshake limitation based on
> +	handshake worker congestion and queued SMC handshake load.
> +
> +	Possible values:
> +
> +	- 0 - Disable handshake limitation
> +	- 1 - Enable handshake limitation
> +
> +	Default: 0 (disable)
> +
> +hs_ctrl - STRING
> +	Select the SMC handshake control profile by name.
> +
> +	The selected profile controls whether SMC options are advertised
> +	during TCP SYN/SYN-ACK handshake.
> +
> +	Only available when CONFIG_SMC_HS_CTRL_BPF is enabled.
> +	Write an empty string to clear the current profile.

It would be better to clarify that this string refers to the name of a
BPF struct_ops (type smc_hs_ctrl) implemented by the user.

> +
> +	Default: empty string
> \ No newline at end of file
> -- 
> 2.43.0
>