netdev - Re: [PATCH net-next] sctp: uncork the old asoc before changing to the new one

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Date:   Tue, 20 Jun 2017 15:33:07 -0400 (EDT)
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
Subject: Re: [PATCH net-next] sctp: uncork the old asoc before changing to
 the new one

From: Xin Long <lucien.xin@...il.com>
Date: Tue, 20 Jun 2017 16:01:55 +0800

> local_cork is used to decide if it should uncork asoc outq after processing
> some cmds, and it is set when replying or sending msgs. local_cork should
> always have the same value with current asoc q->cork in some way.
> 
> The thing is when changing to a new asoc by cmd SET_ASOC, local_cork may
> not be consistent with the current asoc any more. The cmd seqs can be:
> 
>   SCTP_CMD_UPDATE_ASSOC (asoc)
>   SCTP_CMD_REPLY (asoc)
>   SCTP_CMD_SET_ASOC (new_asoc)
>   SCTP_CMD_DELETE_TCB (new_asoc)
>   SCTP_CMD_SET_ASOC (asoc)
>   SCTP_CMD_REPLY (asoc)
> 
> The 1st REPLY makes OLD asoc q->cork and local_cork both are 1, and the cmd
> DELETE_TCB clears NEW asoc q->cork and local_cork. After asoc goes back to
> OLD asoc, q->cork is still 1 while local_cork is 0. The 2nd REPLY will not
> set local_cork because q->cork is already set and it can't be uncorked and
> sent out because of this.
> 
> To keep local_cork consistent with the current asoc q->cork, this patch is
> to uncork the old asoc if local_cork is set before changing to the new one.
> 
> Note that the above cmd seqs will be used in the next patch when updating
> asoc and handling errors in it.
> 
> Suggested-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
> Signed-off-by: Xin Long <lucien.xin@...il.com>

Applied.