netdev - Re: [PATCH] sctp: flush if we can't fit another DATA chunk

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Date:	Wed, 30 Mar 2016 08:03:57 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Cc:	netdev@...r.kernel.org, Vlad Yasevich <vyasevich@...il.com>,
	linux-sctp@...r.kernel.org
Subject: Re: [PATCH] sctp: flush if we can't fit another DATA chunk

On Tue, Mar 29, 2016 at 10:41:25AM -0300, Marcelo Ricardo Leitner wrote:
> There is no point in 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.
> 
> Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
> ---
>  net/sctp/output.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/net/sctp/output.c b/net/sctp/output.c
> index 97745351d58c2fb32b9f9b57d61831d7724d83b2..c518569123ce42a8f21f80754756306c39875013 100644
> --- a/net/sctp/output.c
> +++ b/net/sctp/output.c
> @@ -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 >
> +		maxsize - packet->overhead - sizeof(sctp_data_chunk_t) - 4)
>  		/* Enough data queued to fill a packet */
>  		return SCTP_XMIT_OK;
>  
> -- 
> 2.5.0
> 
> --
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Acked-By: Neil Horman <nhorman@...driver.com>