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Commit f07373ea authored by David Howells's avatar David Howells
Browse files

rxrpc: Add re-sent Tx annotation 



Add a Tx-phase annotation for packet buffers to indicate that a buffer has
already been retransmitted.  This will be used by future congestion
management.  Re-retransmissions of a packet don't affect the congestion
window managment in the same way as initial retransmissions.

Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
parent 5a924b89

net/rxrpc/ar-internal.h

+2 −0
Original line number Diff line number Diff line
@@ -505,6 +505,8 @@ struct rxrpc_call { 
#define RXRPC_TX_ANNO_UNACK	1

#define RXRPC_TX_ANNO_NAK	2

#define RXRPC_TX_ANNO_RETRANS	3

#define RXRPC_TX_ANNO_MASK	0x03

#define RXRPC_TX_ANNO_RESENT	0x04

#define RXRPC_RX_ANNO_JUMBO	0x3f		/* Jumbo subpacket number + 1 if not zero */

#define RXRPC_RX_ANNO_JLAST	0x40		/* Set if last element of a jumbo packet */

#define RXRPC_RX_ANNO_VERIFIED	0x80		/* Set if verified and decrypted */

net/rxrpc/call_event.c

+19 −9
Original line number Diff line number Diff line
@@ -144,7 +144,7 @@ static void rxrpc_resend(struct rxrpc_call *call) 
	rxrpc_seq_t cursor, seq, top;

	unsigned long resend_at, now;

	int ix;

	u8 annotation;

	u8 annotation, anno_type;



	_enter("{%d,%d}", call->tx_hard_ack, call->tx_top);
@@ -165,14 +165,16 @@ static void rxrpc_resend(struct rxrpc_call *call) 
	for (seq = cursor + 1; before_eq(seq, top); seq++) {

		ix = seq & RXRPC_RXTX_BUFF_MASK;

		annotation = call->rxtx_annotations[ix];

		if (annotation == RXRPC_TX_ANNO_ACK)

		anno_type = annotation & RXRPC_TX_ANNO_MASK;

		annotation &= ~RXRPC_TX_ANNO_MASK;

		if (anno_type == RXRPC_TX_ANNO_ACK)

			continue;



		skb = call->rxtx_buffer[ix];

		rxrpc_see_skb(skb, rxrpc_skb_tx_seen);

		sp = rxrpc_skb(skb);



		if (annotation == RXRPC_TX_ANNO_UNACK) {

		if (anno_type == RXRPC_TX_ANNO_UNACK) {

			if (time_after(sp->resend_at, now)) {

				if (time_before(sp->resend_at, resend_at))

					resend_at = sp->resend_at;
@@ -181,7 +183,7 @@ static void rxrpc_resend(struct rxrpc_call *call) 
		}



		/* Okay, we need to retransmit a packet. */

		call->rxtx_annotations[ix] = RXRPC_TX_ANNO_RETRANS;

		call->rxtx_annotations[ix] = RXRPC_TX_ANNO_RETRANS | annotation;

	}



	call->resend_at = resend_at;
@@ -194,7 +196,8 @@ static void rxrpc_resend(struct rxrpc_call *call) 
	for (seq = cursor + 1; before_eq(seq, top); seq++) {

		ix = seq & RXRPC_RXTX_BUFF_MASK;

		annotation = call->rxtx_annotations[ix];

		if (annotation != RXRPC_TX_ANNO_RETRANS)

		anno_type = annotation & RXRPC_TX_ANNO_MASK;

		if (anno_type != RXRPC_TX_ANNO_RETRANS)

			continue;



		skb = call->rxtx_buffer[ix];
@@ -220,10 +223,17 @@ static void rxrpc_resend(struct rxrpc_call *call) 
		 * received and the packet might have been hard-ACK'd (in which

		 * case it will no longer be in the buffer).

		 */

		if (after(seq, call->tx_hard_ack) &&

		    (call->rxtx_annotations[ix] == RXRPC_TX_ANNO_RETRANS ||

		     call->rxtx_annotations[ix] == RXRPC_TX_ANNO_NAK))

			call->rxtx_annotations[ix] = RXRPC_TX_ANNO_UNACK;

		if (after(seq, call->tx_hard_ack)) {

			annotation = call->rxtx_annotations[ix];

			anno_type = annotation & RXRPC_TX_ANNO_MASK;

			if (anno_type == RXRPC_TX_ANNO_RETRANS ||

			    anno_type == RXRPC_TX_ANNO_NAK) {

				annotation &= ~RXRPC_TX_ANNO_MASK;

				annotation |= RXRPC_TX_ANNO_UNACK;

			}

			annotation |= RXRPC_TX_ANNO_RESENT;

			call->rxtx_annotations[ix] = annotation;

		}



		if (after(call->tx_hard_ack, seq))

			seq = call->tx_hard_ack;

net/rxrpc/input.c

+11 −3
Original line number Diff line number Diff line
@@ -388,17 +388,25 @@ static void rxrpc_input_soft_acks(struct rxrpc_call *call, u8 *acks, 
{

	bool resend = false;

	int ix;

	u8 annotation, anno_type;



	for (; nr_acks > 0; nr_acks--, seq++) {

		ix = seq & RXRPC_RXTX_BUFF_MASK;

		annotation = call->rxtx_annotations[ix];

		anno_type = annotation & RXRPC_TX_ANNO_MASK;

		annotation &= ~RXRPC_TX_ANNO_MASK;

		switch (*acks++) {

		case RXRPC_ACK_TYPE_ACK:

			call->rxtx_annotations[ix] = RXRPC_TX_ANNO_ACK;

			if (anno_type == RXRPC_TX_ANNO_ACK)

				continue;

			call->rxtx_annotations[ix] =

				RXRPC_TX_ANNO_ACK | annotation;

			break;

		case RXRPC_ACK_TYPE_NACK:

			if (call->rxtx_annotations[ix] == RXRPC_TX_ANNO_NAK)

			if (anno_type == RXRPC_TX_ANNO_NAK)

				continue;

			call->rxtx_annotations[ix] = RXRPC_TX_ANNO_NAK;

			call->rxtx_annotations[ix] =

				RXRPC_TX_ANNO_NAK | annotation;

			resend = true;

			break;

		default: