91 		/* We analyse the number of packets that get ACK'd per RTT  in rxrpc_congestion_management()
183 	/* Send some previously unsent DATA if we have some to advance the ACK  in rxrpc_congestion_management()
196  * Apply a hard ACK by advancing the Tx window.
255  * or a final ACK packet.
388  * (that information is encoded in the ACK packet).
419 	u8 ack = 0;  in rxrpc_input_data()  local
462 			ack = RXRPC_ACK_NOSPACE;  in rxrpc_input_data()
464 			goto ack;  in rxrpc_input_data()
503 			ack = RXRPC_ACK_DUPLICATE;  in rxrpc_input_data()
511 			if (ack != RXRPC_ACK_DUPLICATE) {  in rxrpc_input_data()
512 				ack = RXRPC_ACK_DUPLICATE;  in rxrpc_input_data()
520 			ack = RXRPC_ACK_EXCEEDS_WINDOW;  in rxrpc_input_data()
529 			goto ack;  in rxrpc_input_data()
532 		if (flags & RXRPC_REQUEST_ACK && !ack) {  in rxrpc_input_data()
533 			ack = RXRPC_ACK_REQUESTED;  in rxrpc_input_data()
553 			/* Send an immediate ACK if we fill in a hole */  in rxrpc_input_data()
554 			if (!ack) {  in rxrpc_input_data()
555 				ack = RXRPC_ACK_DELAY;  in rxrpc_input_data()
572 			if (!ack) {  in rxrpc_input_data()
573 				ack = RXRPC_ACK_DELAY;  in rxrpc_input_data()
584 				ack = RXRPC_ACK_OUT_OF_SEQUENCE;  in rxrpc_input_data()
591 ack:  in rxrpc_input_data()
592 	if (ack)  in rxrpc_input_data()
593 		rxrpc_propose_ACK(call, ack, ack_serial,  in rxrpc_input_data()
665  * Process the response to a ping that we sent to find out if we lost an ACK.
714  * Process the extra information that may be appended to an ACK packet
725 	_proto("Rx ACK %%%u Info { rx=%u max=%u rwin=%u jm=%u }",  in rxrpc_input_ackinfo()
760  * Each ACK in the array corresponds to one packet and can be either an ACK or
762  * packets that lie beyond the end of the ACK list are scheduled for resend by
764  * the time the ACK was sent.
809  * Return true if the ACK is valid - ie. it doesn't appear to have regressed
810  * with respect to the ack state conveyed by preceding ACKs.
833  * Process an ACK packet.
835  * ack.firstPacket is the sequence number of the first soft-ACK'd/NAK'd packet
836  * in the ACK array.  Anything before that is hard-ACK'd and may be discarded.
838  * A hard-ACK means that a packet has been processed and may be discarded; a
839  * soft-ACK means that the packet may be discarded and retransmission
840  * requested.  A phase is complete when all packets are hard-ACK'd.
847 		struct rxrpc_ackpacket ack;  in rxrpc_input_ack()  member
858 	if (skb_copy_bits(skb, offset, &buf.ack, sizeof(buf.ack)) < 0) {  in rxrpc_input_ack()
862 	offset += sizeof(buf.ack);  in rxrpc_input_ack()
865 	acked_serial = ntohl(buf.ack.serial);  in rxrpc_input_ack()
866 	first_soft_ack = ntohl(buf.ack.firstPacket);  in rxrpc_input_ack()
867 	prev_pkt = ntohl(buf.ack.previousPacket);  in rxrpc_input_ack()
869 	nr_acks = buf.ack.nAcks;  in rxrpc_input_ack()
870 	summary.ack_reason = (buf.ack.reason < RXRPC_ACK__INVALID ?  in rxrpc_input_ack()
871 			      buf.ack.reason : RXRPC_ACK__INVALID);  in rxrpc_input_ack()
877 	switch (buf.ack.reason) {  in rxrpc_input_ack()
895 	if (buf.ack.reason == RXRPC_ACK_PING) {  in rxrpc_input_ack()
896 		_proto("Rx ACK %%%u PING Request", ack_serial);  in rxrpc_input_ack()