netdev - Re: [PATCHv2 net] sctp: change to save MSG

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Message-Id: <20170328.175628.2142642924151397064.davem@davemloft.net>
Date:   Tue, 28 Mar 2017 17:56:28 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     lucien.xin@...il.com
Cc:     netdev@...r.kernel.org, linux-sctp@...r.kernel.org,
        marcelo.leitner@...il.com, nhorman@...driver.com,
        david.laight@...lab.com
Subject: Re: [PATCHv2 net] sctp: change to save MSG_MORE flag into assoc

From: Xin Long <lucien.xin@...il.com>
Date: Mon, 27 Mar 2017 00:21:15 +0800

> David Laight noticed the support for MSG_MORE with datamsg->force_delay
> didn't really work as we expected, as the first msg with MSG_MORE set
> would always block the following chunks' dequeuing.
> 
> This Patch is to rewrite it by saving the MSG_MORE flag into assoc as
> David Laight suggested.
> 
> asoc->force_delay is used to save MSG_MORE flag before a msg is sent.
> All chunks in queue would not be sent out if asoc->force_delay is set
> by the msg with MSG_MORE flag, until a new msg without MSG_MORE flag
> clears asoc->force_delay.
> 
> Note that this change would not affect the flush is generated by other
> triggers, like asoc->state != ESTABLISHED, queue size > pmtu etc.
> 
> v1->v2:
>   Not clear asoc->force_delay after sending the msg with MSG_MORE flag.
> 
> Fixes: 4ea0c32f5f42 ("sctp: add support for MSG_MORE")
> Signed-off-by: Xin Long <lucien.xin@...il.com>

Applied, thanks.