[v1.20.x] prov/efa: Don't do handshake for local read

Currently, we always trigger a handshake to check the interoperatability
on two sides for rdma read capabilities, before determining the protocol
to use. However, if the read is from the self peer, we don't need such
handshake and just need to check the rdma capability for local ep.

Signed-off-by: Shi Jin <[email protected]>
(cherry picked from commit 7618a09)

prov/efa/src/rdm/efa_rdm_rma.c

@@ -173,8 +173,10 @@ ssize_t efa_rdm_rma_readmsg(struct fid_ep *ep, const struct fi_msg_rma *msg, uin
 
 	/*
 	 * A handshake is required to choose the correct protocol (whether to use device read).
+	 * For local read (read from self ep), such handshake is not needed because we only
+	 * need to check the local ep's capabilities.
 	 */
-	if (!(peer->flags & EFA_RDM_PEER_HANDSHAKE_RECEIVED)) {
+	if (!(peer->is_self) && !(peer->flags & EFA_RDM_PEER_HANDSHAKE_RECEIVED)) {
 		err = efa_rdm_ep_trigger_handshake(efa_rdm_ep, txe->addr);
 		err = err ? err : -FI_EAGAIN;
 		goto out;