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Commit 83337dae authored by Gerrit Renker's avatar Gerrit Renker
Browse files

dccp ccid-2: Stop polling 



This updates CCID2 to use the CCID dequeuing mechanism, converting from
previous constant-polling to a now event-driven mechanism.

Signed-off-by: default avatarGerrit Renker <gerrit@erg.abdn.ac.uk>
parent 146993cf

net/dccp/ccids/ccid2.c

+13 −8
Original line number Diff line number Diff line
@@ -123,12 +123,9 @@ static int ccid2_hc_tx_alloc_seq(struct ccid2_hc_tx_sock *hctx) 


static int ccid2_hc_tx_send_packet(struct sock *sk, struct sk_buff *skb)

{

	struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);



	if (hctx->pipe < hctx->cwnd)

		return 0;



	return 1; /* XXX CCID should dequeue when ready instead of polling */

	if (ccid2_cwnd_network_limited(ccid2_hc_tx_sk(sk)))

		return CCID_PACKET_WILL_DEQUEUE_LATER;

	return CCID_PACKET_SEND_AT_ONCE;

}



static void ccid2_change_l_ack_ratio(struct sock *sk, u32 val)
@@ -168,6 +165,7 @@ static void ccid2_hc_tx_rto_expire(unsigned long data) 
{

	struct sock *sk = (struct sock *)data;

	struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);

	const bool sender_was_blocked = ccid2_cwnd_network_limited(hctx);

	long s;



	bh_lock_sock(sk);
@@ -187,8 +185,6 @@ static void ccid2_hc_tx_rto_expire(unsigned long data) 
	if (s > 60)

		hctx->rto = 60 * HZ;



	ccid2_start_rto_timer(sk);



	/* adjust pipe, cwnd etc */

	hctx->ssthresh = hctx->cwnd / 2;

	if (hctx->ssthresh < 2)
@@ -205,6 +201,11 @@ static void ccid2_hc_tx_rto_expire(unsigned long data) 
	hctx->rpdupack = -1;

	ccid2_change_l_ack_ratio(sk, 1);

	ccid2_hc_tx_check_sanity(hctx);



	/* if we were blocked before, we may now send cwnd=1 packet */

	if (sender_was_blocked)

		tasklet_schedule(&dccp_sk(sk)->dccps_xmitlet);

	ccid2_start_rto_timer(sk);

out:

	bh_unlock_sock(sk);

	sock_put(sk);
@@ -455,6 +456,7 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) 
{

	struct dccp_sock *dp = dccp_sk(sk);

	struct ccid2_hc_tx_sock *hctx = ccid2_hc_tx_sk(sk);

	const bool sender_was_blocked = ccid2_cwnd_network_limited(hctx);

	struct dccp_ackvec_parsed *avp;

	u64 ackno, seqno;

	struct ccid2_seq *seqp;
@@ -640,6 +642,9 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb) 


	ccid2_hc_tx_check_sanity(hctx);

done:

	/* check if incoming Acks allow pending packets to be sent */

	if (sender_was_blocked && !ccid2_cwnd_network_limited(hctx))

		tasklet_schedule(&dccp_sk(sk)->dccps_xmitlet);

	dccp_ackvec_parsed_cleanup(&hctx->av_chunks);

}

net/dccp/ccids/ccid2.h

+5 −0
Original line number Diff line number Diff line
@@ -70,6 +70,11 @@ struct ccid2_hc_tx_sock { 
	struct list_head	av_chunks;

};



static inline bool ccid2_cwnd_network_limited(struct ccid2_hc_tx_sock *hctx)

{

	return (hctx->pipe >= hctx->cwnd);

}



struct ccid2_hc_rx_sock {

	int			data;

};