75  * Allocate transmission buffers for an ACK and attach them to local->kv[].
81 	struct rxrpc_ackpacket *ack;  in rxrpc_alloc_ack()  local
88 			      sizeof(*whdr) + sizeof(*ack) + 1 + 3 + sizeof(*trailer), gfp);  in rxrpc_alloc_ack()
101 	ack	= buf + sizeof(*whdr);  in rxrpc_alloc_ack()
102 	filler	= buf + sizeof(*whdr) + sizeof(*ack) + 1;  in rxrpc_alloc_ack()
103 	trailer	= buf + sizeof(*whdr) + sizeof(*ack) + 1 + 3;  in rxrpc_alloc_ack()
106 	kv[0].iov_len	= sizeof(*whdr) + sizeof(*ack);  in rxrpc_alloc_ack()
150  * Fill out an ACK packet.
158 	struct rxrpc_ackpacket *ack = (struct rxrpc_ackpacket *)(whdr + 1);  in rxrpc_fill_out_ack()  local
186 	ack->bufferSpace	= 0;  in rxrpc_fill_out_ack()
187 	ack->maxSkew		= 0;  in rxrpc_fill_out_ack()
188 	ack->firstPacket	= htonl(window);  in rxrpc_fill_out_ack()
189 	ack->previousPacket	= htonl(call->rx_highest_seq);  in rxrpc_fill_out_ack()
190 	ack->serial		= htonl(serial_to_ack);  in rxrpc_fill_out_ack()
191 	ack->reason		= ack_reason;  in rxrpc_fill_out_ack()
192 	ack->nAcks		= wtop - window;  in rxrpc_fill_out_ack()
201 		kv[1].iov_len = ack->nAcks;  in rxrpc_fill_out_ack()
204 		to = umin(ack->nAcks, RXRPC_SACK_SIZE);  in rxrpc_fill_out_ack()
206 		if (sack + ack->nAcks <= RXRPC_SACK_SIZE) {  in rxrpc_fill_out_ack()
207 			memcpy(sackp, call->ackr_sack_table + sack, ack->nAcks);  in rxrpc_fill_out_ack()
213 		pr_warn("ack window backward %x %x", window, wtop);  in rxrpc_fill_out_ack()
214 	} else if (ack->reason == RXRPC_ACK_DELAY) {  in rxrpc_fill_out_ack()
215 		ack->reason = RXRPC_ACK_IDLE;  in rxrpc_fill_out_ack()
243  * Transmit an ACK packet.
252 	struct rxrpc_ackpacket *ack = (struct rxrpc_ackpacket *)(whdr + 1);  in rxrpc_send_ack_packet()  local
268 			   ntohl(ack->firstPacket),  in rxrpc_send_ack_packet()
269 			   ntohl(ack->serial), ack->reason, ack->nAcks,  in rxrpc_send_ack_packet()
300  * Queue an ACK for immediate transmission.
326 	/* Extend a path MTU probe ACK. */  in rxrpc_send_ACK()
353  * Send an ACK probe for path MTU discovery.
374 	 * hard-ACK'd all of its request data.  After that point, we're not  in rxrpc_send_abort_packet()
459 	/* If our RTT cache needs working on, request an ACK.  Also request  in rxrpc_prepare_data_subpacket()
462 	 * However, we mustn't request an ACK on the last reply packet of a  in rxrpc_prepare_data_subpacket()
463 	 * service call, lest OpenAFS incorrectly send us an ACK with some  in rxrpc_prepare_data_subpacket()
464 	 * soft-ACKs in it and then never follow up with a proper hard ACK.  in rxrpc_prepare_data_subpacket()