From: Stephen Hemminger <stephen@networkplumber.org>
To: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
kernel@savoirfairelinux.com,
"David S. Miller" <davem@davemloft.net>
Subject: Re: [PATCH net-next] net: bridge: add helper to call /sbin/bridge-stp
Date: Thu, 8 Sep 2016 17:58:57 -0700 [thread overview]
Message-ID: <20160908175857.35565496@xeon-e3> (raw)
In-Reply-To: <20160908165043.31042-1-vivien.didelot@savoirfairelinux.com>
On Thu, 8 Sep 2016 12:50:43 -0400
Vivien Didelot <vivien.didelot@savoirfairelinux.com> wrote:
> If /sbin/bridge-stp is available on the system, bridge tries to execute
> it instead of the kernel implementation when starting/stopping STP.
>
> If anything goes wrong with /sbin/bridge-stp, bridge silently falls back
> to kernel STP, making hard to debug userspace STP.
>
> This patch adds a br_stp_call_user helper to start/stop userspace STP
> and debug errors from the program: abnormal exit status is stored in the
> lower byte and normal exit status is stored in higher byte.
>
> Below is a simple example on a kernel with dynamic debug enabled:
>
> # ln -s /bin/false /sbin/bridge-stp
> # brctl stp br0 on
> br0: failed to start userspace STP (256)
> # dmesg
> br0: /sbin/bridge-stp exited with code 1
> br0: failed to start userspace STP (256)
> br0: using kernel STP
>
> Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
I understand that debugging STP is hard. But this solution looks like it
would break existing userspace because you changed an API.
next prev parent reply other threads:[~2016-09-09 0:58 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-08 16:50 [PATCH net-next] net: bridge: add helper to call /sbin/bridge-stp Vivien Didelot
2016-09-09 0:58 ` Stephen Hemminger [this message]
2016-09-09 13:09 ` Vivien Didelot
2016-09-13 15:22 ` David Miller
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