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Message-Id: <20150628.164326.1697483508955370526.davem@davemloft.net>
Date: Sun, 28 Jun 2015 16:43:26 -0700 (PDT)
From: David Miller <davem@...emloft.net>
To: jon.maloy@...csson.com
Cc: netdev@...r.kernel.org, paul.gortmaker@...driver.com,
erik.hugne@...csson.com, ying.xue@...driver.com, maloy@...jonn.com,
tipc-discussion@...ts.sourceforge.net
Subject: Re: [PATCH net 1/1] tipc: purge backlog queue counters when
broadcast link is reset
From: Jon Maloy <jon.maloy@...csson.com>
Date: Sun, 28 Jun 2015 09:44:44 -0400
> In commit 1f66d161ab3d8b518903fa6c3f9c1f48d6919e74
> ("tipc: introduce starvation free send algorithm")
> we introduced a counter per priority level for buffers
> in the link backlog queue. We also introduced a new
> function tipc_link_purge_backlog(), to reset these
> counters to zero when the link is reset.
>
> Unfortunately, we missed to call this function when
> the broadcast link is reset, with the result that the
> values of these counters might be permanently skewed
> when new nodes are attached. This may in the worst case
> lead to permananent, but spurious, broadcast link
> congestion, where no broadcast packets can be sent at
> all.
>
> We fix this bug with this commit.
>
> Signed-off-by: Jon Maloy <jon.maloy@...csson.com>
Applied, thanks.
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