Commit a1602d74 authored Oct 30, 2023 by Gerd Bayer Committed by Paolo Abeni Nov 02, 2023

net/smc: fix documentation of buffer sizes



Since commit 833bac7e ("net/smc: Fix setsockopt and sysctl to
specify same buffer size again") the SMC protocol uses its own
default values for the smc.rmem and smc.wmem sysctl variables
which are no longer derived from the TCP IPv4 buffer sizes.

Fixup the kernel documentation to reflect this change, too.

Fixes: 833bac7e ("net/smc: Fix setsockopt and sysctl to specify same buffer size again")
Signed-off-by: Gerd Bayer <gbayer@linux.ibm.com>
Reviewed-by: Wenjia Zhang <wenjia@linux.ibm.com>
Reviewed-by: Dust Li <dust.li@linux.alibaba.com>
Link: https://lore.kernel.org/r/20231030170343.748097-1-gbayer@linux.ibm.com


Signed-off-by: Paolo Abeni <pabeni@redhat.com>

parent 8ffbd166

Documentation/networking/smc-sysctl.rst

+2 −4

Original line number	Diff line number	Diff line
		@@ -44,18 +44,16 @@ smcr_testlink_time - INTEGER

		wmem - INTEGER
		Initial size of send buffer used by SMC sockets.
		The default value inherits from net.ipv4.tcp_wmem[1].

		The minimum value is 16KiB and there is no hard limit for max value, but
		only allowed 512KiB for SMC-R and 1MiB for SMC-D.

		Default: 16K
		Default: 64KiB

		rmem - INTEGER
		Initial size of receive buffer (RMB) used by SMC sockets.
		The default value inherits from net.ipv4.tcp_rmem[1].

		The minimum value is 16KiB and there is no hard limit for max value, but
		only allowed 512KiB for SMC-R and 1MiB for SMC-D.

		Default: 128K
		Default: 64KiB