On Wed, Aug 17, 2016 at 09:01:38AM +, David Laight wrote:
> From: Marcelo Ricardo Leitner
> > Sent: 16 August 2016 18:25
> ...
> > > That doesn't seem a good idea.
> > > You don't want to abort the association if there is a transient
> > > memory allocation failure.
> > > You also can't drop da
>> > If letting the application see ENOMEM errors, and sctp has to drop this
>> > chunk, instead of retransmiting the ENOMEM chunk, but the ENOMEM
>> > chunk may not be the chunk from current msg, as it flush all the queue.
>> > even if users get an ENOMEM error, they may re-send a chunk that is s
From: Marcelo Ricardo Leitner
> Sent: 16 August 2016 18:25
...
> > That doesn't seem a good idea.
> > You don't want to abort the association if there is a transient
> > memory allocation failure.
> > You also can't drop data chunks.
>
> From a system-wise POV, this behavior - to free the new asoc
On Tue, Aug 16, 2016 at 03:33:30PM -0300, Marcelo Ricardo Leitner wrote:
> On Wed, Aug 17, 2016 at 02:24:19AM +0800, Xin Long wrote:
> > >> > This err returns back to sctp_sendmsg, there sctp will abort asoc.
> > >
> > > That's not right I think. sctp_sendmsg will only free the asoc if it was
> > >
On Wed, Aug 17, 2016 at 02:24:19AM +0800, Xin Long wrote:
> >> > This err returns back to sctp_sendmsg, there sctp will abort asoc.
> >
> > That's not right I think. sctp_sendmsg will only free the asoc if it was
> > created to send that specific chunk. And in this case, this change
> > should have
>> > This err returns back to sctp_sendmsg, there sctp will abort asoc.
>
> That's not right I think. sctp_sendmsg will only free the asoc if it was
> created to send that specific chunk. And in this case, this change
> should have no effect as it can't have sctp_outq_flush() touching
> several tra
On Tue, Aug 16, 2016 at 04:01:50PM +, David Laight wrote:
> From: Xin Long
> > Sent: 16 August 2016 12:34
> >
> > >> Both sctp_outq_flush_rtx and sctp_packet_transmit can ONLY
> > >> return one error (-ENOMEM), as sctp_outq_flush_rtx also calls
> > >> sctp_packet_transmit.
> > >
> > > What is t
From: Xin Long
> Sent: 16 August 2016 12:34
>
> >> Both sctp_outq_flush_rtx and sctp_packet_transmit can ONLY
> >> return one error (-ENOMEM), as sctp_outq_flush_rtx also calls
> >> sctp_packet_transmit.
> >
> > What is the effect of the error?
> > If it is 'just' equivalent to a lost ethernet pack
>>
>> [1]
>> Both sctp_outq_flush_rtx and sctp_packet_transmit can ONLY
>> return one error (-ENOMEM), as sctp_outq_flush_rtx also calls
>> sctp_packet_transmit.
>
> What is the effect of the error?
> If it is 'just' equivalent to a lost ethernet packet (and the skb (etc)
> is freed) then the proto
From: Xin Long
> Sent: 13 August 2016 08:48
> >
> > This style of error handling is dangerous. The first error can be
> > lost.
> >
> > For example, if sctp_outq_flush_rtx() earlier in this function returns
> > an error, it will be lost if any invocation of the function
> > sctp_packet_transmit()
>
> This style of error handling is dangerous. The first error can be
> lost.
>
> For example, if sctp_outq_flush_rtx() earlier in this function returns
> an error, it will be lost if any invocation of the function
> sctp_packet_transmit() at the end function signals an error.
>
> I think you shou
From: Xin Long
Date: Thu, 11 Aug 2016 20:52:58 +0800
> Now in the end of sctp_outq_flush, sctp calls sctp_packet_transmit
> in a loop. The return of current sctp_packet_transmit always covers
> the prior one's. If the last call of sctp_packet_transmit return a
> success, it may hide the error tha
On Thu, Aug 11, 2016 at 08:52:58PM +0800, Xin Long wrote:
> Now in the end of sctp_outq_flush, sctp calls sctp_packet_transmit
> in a loop. The return of current sctp_packet_transmit always covers
> the prior one's. If the last call of sctp_packet_transmit return a
> success, it may hide the error
On Thu, Aug 11, 2016 at 08:52:58PM +0800, Xin Long wrote:
> Now in the end of sctp_outq_flush, sctp calls sctp_packet_transmit
> in a loop. The return of current sctp_packet_transmit always covers
> the prior one's. If the last call of sctp_packet_transmit return a
> success, it may hide the error
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