prov/efa: Make NACK protocol fall back to DC longCTS when DC is reque…

…sted

When application requests FI_DELIVERY_COMPLETE, it should fallback
to the DC version of LONG CTS RTMs, as the default LongCTS is not DC.

Signed-off-by: Jessie Yang <jiaxiyan@amazon.com>

prov/efa/src/rdm/efa_rdm_ope.c

@@ -1773,6 +1773,8 @@ ssize_t efa_rdm_ope_post_send(struct efa_rdm_ope *ope, int pkt_type)
 ssize_t efa_rdm_ope_post_send_fallback(struct efa_rdm_ope *ope,
 					   int pkt_type, ssize_t err)
 {
+	bool delivery_complete_requested = ope->fi_flags & FI_DELIVERY_COMPLETE;
+
 	if (err == -FI_ENOMR) {
 		/* Long read and runting read protocols could fail because of a
 		 * lack of memory registrations. In that case, we retry with
@@ -1786,15 +1788,15 @@ ssize_t efa_rdm_ope_post_send_fallback(struct efa_rdm_ope *ope,
 				 "protocol because memory registration limit "
 				 "was reached on the sender\n");
 			return efa_rdm_ope_post_send_or_queue(
-				ope, EFA_RDM_LONGCTS_MSGRTM_PKT);
+				ope, delivery_complete_requested ?  EFA_RDM_DC_LONGCTS_MSGRTM_PKT : EFA_RDM_LONGCTS_MSGRTM_PKT);
 		case EFA_RDM_LONGREAD_TAGRTM_PKT:
 		case EFA_RDM_RUNTREAD_TAGRTM_PKT:
 			EFA_INFO(FI_LOG_EP_CTRL,
 				 "Sender fallback to long CTS tagged protocol "
 				 "because memory registration limit was "
 				 "reached on the sender\n");
 			return efa_rdm_ope_post_send_or_queue(
-				ope, EFA_RDM_LONGCTS_TAGRTM_PKT);
+				ope, delivery_complete_requested ?  EFA_RDM_DC_LONGCTS_TAGRTM_PKT : EFA_RDM_LONGCTS_TAGRTM_PKT);
 		default:
 			return err;
 		}

prov/efa/src/rdm/efa_rdm_pke_cmd.c

@@ -187,11 +187,17 @@ int efa_rdm_pke_fill_data(struct efa_rdm_pke *pkt_entry,
 		ret = efa_rdm_pke_init_dc_medium_tagrtm(pkt_entry, ope, data_offset, data_size);
 		break;
 	case EFA_RDM_DC_LONGCTS_MSGRTM_PKT:
-		assert(data_offset == 0 && data_size == -1);
+		/* The data_offset will be non-zero when the DC long CTS RTM packet
+		 * is sent to continue a runting read transfer after the
+		 * receiver has run out of memory registrations */
+		assert((data_offset == 0 || ope->internal_flags & EFA_RDM_OPE_READ_NACK) && data_size == -1);
 		ret = efa_rdm_pke_init_dc_longcts_msgrtm(pkt_entry, ope);
 		break;
 	case EFA_RDM_DC_LONGCTS_TAGRTM_PKT:
-		assert(data_offset == 0 && data_size == -1);
+		/* The data_offset will be non-zero when the DC long CTS tagged RTM packet
+		 * is sent to continue a runting read transfer after the
+		 * receiver has run out of memory registrations */
+		assert((data_offset == 0 || ope->internal_flags & EFA_RDM_OPE_READ_NACK) && data_size == -1);
 		ret = efa_rdm_pke_init_dc_longcts_tagrtm(pkt_entry, ope);
 		break;
 	case EFA_RDM_DC_EAGER_RTW_PKT:

prov/efa/src/rdm/efa_rdm_pke_nonreq.c

@@ -690,6 +690,7 @@ void efa_rdm_pke_handle_read_nack_recv(struct efa_rdm_pke *pkt_entry)
 {
 	struct efa_rdm_read_nack_hdr *nack_hdr;
 	struct efa_rdm_ope *txe;
+	bool delivery_complete_requested;
 
 	efa_rdm_ep_domain(pkt_entry->ep)->num_read_msg_in_flight -= 1;
 
@@ -700,23 +701,34 @@ void efa_rdm_pke_handle_read_nack_recv(struct efa_rdm_pke *pkt_entry)
 	efa_rdm_pke_release_rx(pkt_entry);
 	txe->internal_flags |= EFA_RDM_OPE_READ_NACK;
 
+	delivery_complete_requested = txe->fi_flags & FI_DELIVERY_COMPLETE;
+
 	if (txe->op == ofi_op_write) {
 		EFA_INFO(FI_LOG_EP_CTRL,
 			 "Sender fallback to emulated long CTS write "
 			 "protocol because p2p is not available\n");
-		efa_rdm_ope_post_send_or_queue(txe, EFA_RDM_LONGCTS_RTW_PKT);
+		efa_rdm_ope_post_send_or_queue(
+			txe, delivery_complete_requested ?
+			     EFA_RDM_DC_LONGCTS_RTW_PKT :
+			     EFA_RDM_LONGCTS_RTW_PKT);
 	} else if (txe->op == ofi_op_tagged) {
 		EFA_INFO(FI_LOG_EP_CTRL,
 			 "Sender fallback to long CTS tagged "
 			 "protocol because memory registration limit "
 			 "was reached on the receiver\n");
-		efa_rdm_ope_post_send_or_queue(txe, EFA_RDM_LONGCTS_TAGRTM_PKT);
+		efa_rdm_ope_post_send_or_queue(
+			txe, delivery_complete_requested ?
+			     EFA_RDM_DC_LONGCTS_TAGRTM_PKT :
+			     EFA_RDM_LONGCTS_TAGRTM_PKT);
 	} else {
 		EFA_INFO(FI_LOG_EP_CTRL,
 			 "Sender fallback to long CTS untagged "
 			 "protocol because memory registration limit "
 			 "was reached on the receiver\n");
-		efa_rdm_ope_post_send_or_queue(txe, EFA_RDM_LONGCTS_MSGRTM_PKT);
+		efa_rdm_ope_post_send_or_queue(
+			txe, delivery_complete_requested ?
+			     EFA_RDM_DC_LONGCTS_MSGRTM_PKT :
+			     EFA_RDM_LONGCTS_MSGRTM_PKT);
 	}
 }