net/smc: Introduce IPPROTO_SMC

net/smc: Introduce IPPROTO_SMC

This patch allows to create smc socket via AF_INET,
similar to the following code,

/* create v4 smc sock */
v4 = socket(AF_INET, SOCK_STREAM, IPPROTO_SMC);

/* create v6 smc sock */
v6 = socket(AF_INET6, SOCK_STREAM, IPPROTO_SMC);

There are several reasons why we believe it is appropriate here:

1. For smc sockets, it actually use IPv4 (AF-INET) or IPv6 (AF-INET6)
address. There is no AF_SMC address at all.

2. Create smc socket in the AF_INET(6) path, which allows us to reuse
the infrastructure of AF_INET(6) path, such as common ebpf hooks.
Otherwise, smc have to implement it again in AF_SMC path.

Signed-off-by: D. Wythe <[email protected]>
Reviewed-by: Wenjia Zhang <[email protected]>
Reviewed-by: Dust Li <[email protected]>
Tested-by: Niklas Schnelle <[email protected]>
Tested-by: Wenjia Zhang <[email protected]>
Signed-off-by: David S. Miller <[email protected]>