netdev - Re: [PATCH net] sctp: report SCTP_ERROR_INV

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Date:   Mon, 20 Nov 2017 10:29:10 -0200
From:   Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:     Xin Long <lucien.xin@...il.com>
Cc:     network dev <netdev@...r.kernel.org>, linux-sctp@...r.kernel.org,
        davem <davem@...emloft.net>, Neil Horman <nhorman@...driver.com>
Subject: Re: [PATCH net] sctp: report SCTP_ERROR_INV_STRM as cpu endian

On Sun, Nov 19, 2017 at 02:20:04AM +0800, Xin Long wrote:
> On Fri, Nov 17, 2017 at 11:04 PM, Marcelo Ricardo Leitner
> <marcelo.leitner@...il.com> wrote:
> > On Fri, Nov 17, 2017 at 02:15:02PM +0800, Xin Long wrote:
> >> rfc6458 demands the send_error in SCTP_SEND_FAILED_EVENT should
> >> be in cpu endian, while SCTP_ERROR_INV_STRM is in big endian.
> >>
> >> This issue is there since very beginning, Eric noticed it by
> >> running 'make C=2 M=net/sctp/'.
> >>
> >> This patch is to convert it before reporting it.
> >
> > Unfortunatelly we can't fix this as this will break UAPI. It will
> > break applications that are currently matching on the current value.
> yes, you're right, seems all other send_errors also come in big endian now.
> 
> what do you think of using:
> sctp_chunk_fail(ch, (__force __u16)SCTP_ERROR_INV_STRM); or
> 
> sctp_chunk_fail(ch, (__force __u32)SCTP_ERROR_INV_STRM);
> 
> to avoid this warning ?

It's good. The last one is more interesting as it matches function
prototype already.

  Marcelo

> 
> >
> >>
> >> Reported-by: Eric Dumazet <eric.dumazet@...il.com>
> >> Signed-off-by: Xin Long <lucien.xin@...il.com>
> >> ---
> >>  net/sctp/stream.c | 2 +-
> >>  1 file changed, 1 insertion(+), 1 deletion(-)
> >>
> >> diff --git a/net/sctp/stream.c b/net/sctp/stream.c
> >> index a11db21..f86ceee 100644
> >> --- a/net/sctp/stream.c
> >> +++ b/net/sctp/stream.c
> >> @@ -64,7 +64,7 @@ static void sctp_stream_outq_migrate(struct sctp_stream *stream,
> >>                */
> >>
> >>               /* Mark as failed send. */
> >> -             sctp_chunk_fail(ch, SCTP_ERROR_INV_STRM);
> >> +             sctp_chunk_fail(ch, be16_to_cpu(SCTP_ERROR_INV_STRM));
> >>               if (asoc->peer.prsctp_capable &&
> >>                   SCTP_PR_PRIO_ENABLED(ch->sinfo.sinfo_flags))
> >>                       asoc->sent_cnt_removable--;
> >> --
> >> 2.1.0
> >>