netdev - Re: [PATCH net-next v3 1/2] bridge: netlink: make setlink/dellink notifications more accurate

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Date:   Thu, 26 Oct 2017 10:17:02 +0200
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
Cc:     netdev@...r.kernel.org, dsa@...ulusnetworks.com, mrv@...atatu.com,
        davem@...emloft.net, bridge@...ts.linux-foundation.org,
        roopa@...ulusnetworks.com
Subject: Re: [PATCH net-next v3 1/2] bridge: netlink: make setlink/dellink
 notifications more accurate

On Thu, 26 Oct 2017 00:59:41 +0300
Nikolay Aleksandrov <nikolay@...ulusnetworks.com> wrote:

> Before this patch we had cases that either sent notifications when there
> were in fact no changes (e.g. non-existent vlan delete) or didn't send
> notifications when there were changes (e.g. vlan add range with an error in
> the middle, port flags change + vlan update error). This patch sends down
> a boolean to the functions setlink/dellink use and if there is even a
> single configuration change (port flag, vlan add/del, port state) then
> we always send a notification. This is all done to keep backwards
> compatibility with the opportunistic vlan delete, where one could
> specify a vlan range that has missing vlans inside and still everything
> in that range will be cleared, this is mostly used to clear the whole
> vlan config with a single call, i.e. range 1-4094.
> 
> Signed-off-by: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>

This looks correct.
As a general note, generating a notice with no change should be ok for a correctly
written application. But missing a notification would cause synchronization problems.

Acked-by: Stephen Hemminger <stephen@...workplumber.org>