net/smc: Add documentation for limit_smc_hs and hs_ctrl

Document missing SMC sysctl parameters limit_smc_hs and hs_ctrl

Signed-off-by: Kyoji Ogasawara <sawara04.o@gmail.com>
Reviewed-by: D. Wythe<alibuda@linux.alibaba.com>
Link: https://patch.msgid.link/20260309124541.22723-3-sawara04.o@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/Documentation/networking/smc-sysctl.rst b/Documentation/networking/smc-sysctl.rst
index 17b8314c0e5eaa70571695366db60bc1452121cf..a8b4f357174efb7d3b4580cceba628b8c855e758 100644 (file)
--- a/Documentation/networking/smc-sysctl.rst
+++ b/Documentation/networking/smc-sysctl.rst
@@ -111,3 +111,30 @@ 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.
+
+       This string refers to the name of a user-implemented
+       BPF struct_ops instance of type smc_hs_ctrl.
+
+       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.
+
+       Default: empty string