netdev - Re: [net 1/1] tipc: base group replicast ack counter on number of actual receivers

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Date:   Tue, 26 Dec 2017 13:01:30 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     jon.maloy@...csson.com
Cc:     netdev@...r.kernel.org,
        mohan.krishna.ghanta.krishnamurthy@...csson.com,
        tung.q.nguyen@...tech.com.au, hoang.h.le@...tech.com.au,
        canh.d.luu@...tech.com.au, ying.xue@...driver.com,
        tipc-discussion@...ts.sourceforge.net
Subject: Re: [net 1/1] tipc: base group replicast ack counter on number of
 actual receivers

From: Jon Maloy <jon.maloy@...csson.com>
Date: Thu, 21 Dec 2017 13:07:11 +0100

> In commit 2f487712b893 ("tipc: guarantee that group broadcast doesn't
> bypass group unicast") we introduced a mechanism that requires the first
> (replicated) broadcast sent after a unicast to be acknowledged by all
> receivers before permitting sending of the next (true) broadcast.
> 
> The counter for keeping track of the number of acknowledges to expect
> is based on the tipc_group::member_cnt variable. But this misses that
> some of the known members may not be ready for reception, and will never
> acknowledge the message, either because they haven't fully joined the
> group or because they are leaving the group. Such members are identified
> by not fulfilling the condition tested for in the function
> tipc_group_is_enabled().
> 
> We now set the counter for the actual number of acks to receive at the
> moment the message is sent, by just counting the number of recipients
> satisfying the tipc_group_is_enabled() test.
> 
> Signed-off-by: Jon Maloy <jon.maloy@...csson.com>

Applied, thanks Jon.