diff options
author | David Laight <David.Laight@ACULAB.COM> | 2014-07-22 08:59:08 +0000 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2014-07-22 13:32:10 -0700 |
commit | 723189faca78f2b70fcf9088f056a2440986cc45 (patch) | |
tree | 47b1dc85680d2e48e9a1a13c4bc2bad85c774d08 /net | |
parent | 8fd90bb889635fa1e7f80a3950948cc2e74c1446 (diff) | |
download | linux-723189faca78f2b70fcf9088f056a2440986cc45.tar.bz2 |
net: sctp: Open out the check for Nagle
The check for Nagle contains 6 separate checks all of which must be true
before a data packet is delayed.
Separate out each into its own 'if (test) return SCTP_XMIT_OK' so that
the reasons can be individually described.
Also return directly with SCTP_XMIT_RWND_FULL.
Delete the now-unused 'retval' variable and 'finish' label from
sctp_packet_can_append_data().
Signed-off-by: David Laight <david.laight@aculab.com>
Acked-by: Vlad Yasevich <vyasevich@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r-- | net/sctp/output.c | 69 |
1 files changed, 36 insertions, 33 deletions
diff --git a/net/sctp/output.c b/net/sctp/output.c index 01ab8e0723f0..f3bf0ae244df 100644 --- a/net/sctp/output.c +++ b/net/sctp/output.c @@ -633,7 +633,6 @@ nomem: static sctp_xmit_t sctp_packet_can_append_data(struct sctp_packet *packet, struct sctp_chunk *chunk) { - sctp_xmit_t retval = SCTP_XMIT_OK; size_t datasize, rwnd, inflight, flight_size; struct sctp_transport *transport = packet->transport; struct sctp_association *asoc = transport->asoc; @@ -658,15 +657,11 @@ static sctp_xmit_t sctp_packet_can_append_data(struct sctp_packet *packet, datasize = sctp_data_size(chunk); - if (datasize > rwnd) { - if (inflight > 0) { - /* We have (at least) one data chunk in flight, - * so we can't fall back to rule 6.1 B). - */ - retval = SCTP_XMIT_RWND_FULL; - goto finish; - } - } + if (datasize > rwnd && inflight > 0) + /* We have (at least) one data chunk in flight, + * so we can't fall back to rule 6.1 B). + */ + return SCTP_XMIT_RWND_FULL; /* RFC 2960 6.1 Transmission of DATA Chunks * @@ -680,36 +675,44 @@ static sctp_xmit_t sctp_packet_can_append_data(struct sctp_packet *packet, * When a Fast Retransmit is being performed the sender SHOULD * ignore the value of cwnd and SHOULD NOT delay retransmission. */ - if (chunk->fast_retransmit != SCTP_NEED_FRTX) - if (flight_size >= transport->cwnd) { - retval = SCTP_XMIT_RWND_FULL; - goto finish; - } + if (chunk->fast_retransmit != SCTP_NEED_FRTX && + flight_size >= transport->cwnd) + return SCTP_XMIT_RWND_FULL; /* Nagle's algorithm to solve small-packet problem: * Inhibit the sending of new chunks when new outgoing data arrives * if any previously transmitted data on the connection remains * unacknowledged. */ - if (!sctp_sk(asoc->base.sk)->nodelay && sctp_packet_empty(packet) && - inflight && sctp_state(asoc, ESTABLISHED)) { - unsigned int max = transport->pathmtu - packet->overhead; - unsigned int len = chunk->skb->len + q->out_qlen; - - /* Check whether this chunk and all the rest of pending - * data will fit or delay in hopes of bundling a full - * sized packet. - * Don't delay large message writes that may have been - * fragmeneted into small peices. - */ - if ((len < max) && chunk->msg->can_delay) { - retval = SCTP_XMIT_NAGLE_DELAY; - goto finish; - } - } -finish: - return retval; + if (sctp_sk(asoc->base.sk)->nodelay) + /* Nagle disabled */ + return SCTP_XMIT_OK; + + if (!sctp_packet_empty(packet)) + /* Append to packet */ + return SCTP_XMIT_OK; + + if (inflight == 0) + /* Nothing unacked */ + return SCTP_XMIT_OK; + + if (!sctp_state(asoc, ESTABLISHED)) + return SCTP_XMIT_OK; + + /* Check whether this chunk and all the rest of pending data will fit + * or delay in hopes of bundling a full sized packet. + */ + if (chunk->skb->len + q->out_qlen >= transport->pathmtu - packet->overhead) + /* Enough data queued to fill a packet */ + return SCTP_XMIT_OK; + + /* Don't delay large message writes that may have been fragmented */ + if (!chunk->msg->can_delay) + return SCTP_XMIT_OK; + + /* Defer until all data acked or packet full */ + return SCTP_XMIT_NAGLE_DELAY; } /* This private function does management things when adding DATA chunk */ |