IB/sa: Make sure SA queries use default P_Key

MADs sent to the SA should use the the default P_Key (0x7fff/0xffff).
There's no requirement that the default P_Key is stored at index 0 in
the local P_Key table, so add code to the sa_query module to look up
the index of the default P_Key when creating an address handle for the
SA (which is done any time the P_Key table might change), and use this
index for all SA queries.

Signed-off-by: Sean Hefty <sean.hefty@intel.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

include/rdma/ib_mad.h

@@ -111,6 +111,9 @@
 #define IB_QP1_QKEY	0x80010000
 #define IB_QP_SET_QKEY	0x80000000
 
+#define IB_DEFAULT_PKEY_PARTIAL 0x7FFF
+#define IB_DEFAULT_PKEY_FULL	0xFFFF
+
 enum {
 	IB_MGMT_MAD_HDR = 24,
 	IB_MGMT_MAD_DATA = 232,