linux-kernel - Re: [PATCH net-next] net: dsa: xrs700x: forward HSR supervision frames

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Date:   Tue, 15 Jun 2021 20:31:01 -0500
From:   George McCollister <george.mccollister@...il.com>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     netdev <netdev@...r.kernel.org>, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next] net: dsa: xrs700x: forward HSR supervision frames

On Tue, Jun 15, 2021 at 6:22 PM Vladimir Oltean <olteanv@...il.com> wrote:
>
> On Tue, Jun 15, 2021 at 12:55:26PM -0500, George McCollister wrote:
> > Forward supervision frames between redunant HSR ports. This was broken
> > in the last commit.
> >
> > Fixes: 1a42624aecba ("net: dsa: xrs700x: allow HSR/PRP supervision dupes
> > for node_table")
>
> It would be good if you could resend with the Fixes: line not wrapped
> around. There are several scripts around which won't parse that.

WIll do. I was wondering which way was correct and figured scripts
should be smart enough to parse it especially since all it should
really need is Fixes: $HASH. Oh well.

>
> > Signed-off-by: George McCollister <george.mccollister@...il.com>
> > ---
>
> Otherwise the change looks reasonably clean, and it agrees with what IEC
> 62439-3:2018 does seem to imply in "5.3.4 DANH forwarding rules" that
> HSR_Supervision frames should be forwarded and without discarding
> duplicates. For PRP, of course the DANP does not forward packets between
> the redundant ports, so it does not forward PRP_Supervision packets
> either.

Yeah the tricky part with HSR supervision frames is you must forward
if the other port has received the duplicate frame but not if the
frame has been sent out the port you're about to send from already. At
first I set the mirror bit in addition to the allow bit and activity
was on completely solid as supervision frames looped around.

>
> Reviewed-by: Vladimir Oltean <olteanv@...il.com>

Thanks