RDS: TCP: Add sysctl tunables for sndbuf/rcvbuf on rds-tcp socket
Add per-net sysctl tunables to set the size of sndbuf and rcvbuf on the kernel tcp socket. The tunables are added at /proc/sys/net/rds/tcp/rds_tcp_sndbuf and /proc/sys/net/rds/tcp/rds_tcp_rcvbuf. These values must be set before accept() or connect(), and there may be an arbitrary number of existing rds-tcp sockets when the tunable is modified. To make sure that all connections in the netns pick up the same value for the tunable, we reset existing rds-tcp connections in the netns, so that they can reconnect with the new parameters. Signed-off-by: NSowmini Varadhan <sowmini.varadhan@oracle.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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