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

Currently, we always trigger a handshake to check the interoperatability
on two sides for rdma capabilities, before determining the protocol
to use. However, if the write is to 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 <sjina@amazon.com>
(cherry picked from commit 08a2d60)

prov/efa/src/rdm/efa_rdm_rma.c

@@ -327,6 +327,13 @@ bool efa_rdm_rma_should_write_using_rdma(struct efa_rdm_ep *ep, struct efa_rdm_o
 	    (txe->iov_count > 1 || txe->rma_iov_count > 1))
 		return false;
 
+	/*
+	 * For local write, handshake is not required and
+	 * we just need to check the local ep caps
+	 */
+	if (peer->is_self)
+		return efa_rdm_ep_support_rdma_write(ep);
+
 	/* Check for hardware support of RDMA write.
 	   A handshake should have been made before the check. */
 	assert(peer->flags & EFA_RDM_PEER_HANDSHAKE_RECEIVED);
@@ -353,8 +360,10 @@ ssize_t efa_rdm_rma_post_write(struct efa_rdm_ep *ep, struct efa_rdm_ope *txe)
 
 	/*
 	 * A handshake is required to choose the correct protocol (whether to use device write/read).
+	 * For local write (writing it self), this handshake is not required because we only need to
+	 * check one-side capability
 	 */
-	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(ep, txe->addr);
 		return err ? err : -FI_EAGAIN;
 	}