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sctp: flush if we can't fit another DATA chunk 

There is no point on delaying the packet if we can't fit a single byte
of data on it anymore. So lets just reduce the threshold by the amount
that a data chunk with 4 bytes (rounding) would use.

v2: based on the right tree

Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Marcelo Ricardo Leitner 2016-04-01 14:05:48 -03:00 committed by David S. Miller
parent c862cc9b70
commit e43569e6d3
1 changed files with 2 additions and 1 deletions
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3
net/sctp/output.c
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@ -705,7 +705,8 @@ static sctp_xmit_t sctp_packet_can_append_data(struct sctp_packet *packet,
/* 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)
if (chunk->skb->len + q->out_qlen >
transport->pathmtu - packet->overhead - sizeof(sctp_data_chunk_t) - 4)
/* Enough data queued to fill a packet */
return SCTP_XMIT_OK;