core: Add new CXI endpoint protocol FI_PROTO_CXI_RNR

Reserve new Receiver-Not-Ready endpoint protocol for CXI
provider.

Signed-off-by: Steve Welch <welch@hpe.com>

include/rdma/fabric.h

@@ -346,6 +346,7 @@ enum {
 	FI_PROTO_COLL,
 	FI_PROTO_UCX,
 	FI_PROTO_SM2,
+	FI_PROTO_CXI_RNR,
 };
 
 enum {

man/fi_endpoint.3.md

@@ -753,6 +753,15 @@ protocol value set to one.
 : Protocol for intra-node communication using shared memory segments
   used by the sm2 provider
 
+*FI_PROTO_CXI*
+: Reliable-datagram protocol optimized for HPC applications
+  used by cxi provider.
+
+*FI_PROTO_CXI_RNR*
+: A version of the FI_PROTO_CXI protocol that implements an RNR
+  protocol which can be used when messaging is primarily expected
+  and FI_ORDER_SAS ordering is not required.
+
 *FI_PROTO_UNSPEC*
 : The protocol is not specified.  This is usually provided as input,
   with other attributes of the socket or the provider selecting the

src/fi_tostr.c

@@ -275,6 +275,7 @@ static void ofi_tostr_protocol(char *buf, size_t len, uint32_t protocol)
 	CASEENUMSTRN(FI_PROTO_CXI, len);
 	CASEENUMSTRN(FI_PROTO_XNET, len);
 	CASEENUMSTRN(FI_PROTO_SM2, len);
+	CASEENUMSTRN(FI_PROTO_CXI_RNR, len);
 	default:
 		if (protocol & FI_PROV_SPECIFIC)
 			ofi_strncatf(buf, len, "Provider specific");