smc: establish new socket family

* enable smc module loading and unloading
 * register new socket family
 * basic smc socket creation and deletion
 * use backing TCP socket to run CLC (Connection Layer Control)
   handshake of SMC protocol
 * Setup for infiniband traffic is implemented in follow-on patches.
   For now fallback to TCP socket is always used.

Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Reviewed-by: Utz Bacher <utz.bacher@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/smc/Makefile b/net/smc/Makefile
new file mode 100644
index 0000000..c285c86
--- /dev/null
+++ b/net/smc/Makefile
@@ -0,0 +1,2 @@
+obj-$(CONFIG_SMC)	+= smc.o
+smc-y := af_smc.o