Commit fb586f25 authored by Marcelo Ricardo Leitner's avatar Marcelo Ricardo Leitner Committed by David S. Miller
Browse files

sctp: delay calls to sk_data_ready() as much as possible 



Currently processing of multiple chunks in a single SCTP packet leads to
multiple calls to sk_data_ready, causing multiple wake up signals which
are costy and doesn't make it wake up any faster.

With this patch it will note that the wake up is pending and will do it
before leaving the state machine interpreter, latest place possible to
do it realiably and cleanly.

Note that sk_data_ready events are not dependent on asocs, unlike waking
up writers.

v2: series re-checked
v3: use local vars to cleanup the code, suggested by Jakub Sitnicki
Signed-off-by: default avatarMarcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 250eb1f8

include/net/sctp/structs.h

+2 −1
Original line number Diff line number Diff line
@@ -217,7 +217,8 @@ struct sctp_sock { 
		v4mapped:1,

		frag_interleave:1,

		recvrcvinfo:1,

		recvnxtinfo:1;

		recvnxtinfo:1,

		pending_data_ready:1;



	atomic_t pd_mode;

	/* Receive to here while partial delivery is in effect. */

net/sctp/sm_sideeffect.c

+7 −0
Original line number Diff line number Diff line
@@ -1222,6 +1222,8 @@ static int sctp_cmd_interpreter(sctp_event_t event_type, 
				sctp_cmd_seq_t *commands,

				gfp_t gfp)

{

	struct sock *sk = ep->base.sk;

	struct sctp_sock *sp = sctp_sk(sk);

	int error = 0;

	int force;

	sctp_cmd_t *cmd;
@@ -1742,6 +1744,11 @@ out: 
			error = sctp_outq_uncork(&asoc->outqueue, gfp);

	} else if (local_cork)

		error = sctp_outq_uncork(&asoc->outqueue, gfp);



	if (sp->pending_data_ready) {

		sk->sk_data_ready(sk);

		sp->pending_data_ready = 0;

	}

	return error;

nomem:

	error = -ENOMEM;

net/sctp/ulpqueue.c

+2 −2
Original line number Diff line number Diff line
@@ -264,7 +264,7 @@ int sctp_ulpq_tail_event(struct sctp_ulpq *ulpq, struct sctp_ulpevent *event) 
		sctp_ulpq_clear_pd(ulpq);



	if (queue == &sk->sk_receive_queue)

		sk->sk_data_ready(sk);

		sctp_sk(sk)->pending_data_ready = 1;

	return 1;



out_free:
@@ -1140,5 +1140,5 @@ void sctp_ulpq_abort_pd(struct sctp_ulpq *ulpq, gfp_t gfp) 


	/* If there is data waiting, send it up the socket now. */

	if (sctp_ulpq_clear_pd(ulpq) || ev)

		sk->sk_data_ready(sk);

		sctp_sk(sk)->pending_data_ready = 1;

}

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