linux-kernel - Re: [PATCH v2 net-next 08/10] net: dsa: sja1105: Make sja1105_is_link

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Date:   Mon, 3 Jun 2019 01:00:10 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        "David S. Miller" <davem@...emloft.net>,
        Richard Cochran <richardcochran@...il.com>,
        John Stultz <john.stultz@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH v2 net-next 08/10] net: dsa: sja1105: Make
 sja1105_is_link_local not match meta frames

On Mon, 3 Jun 2019 at 00:40, Vladimir Oltean <olteanv@...il.com> wrote:
>
> Although meta frames are configured to be sent at SJA1105_META_DMAC
> (01-80-C2-00-00-0E) which is a multicast MAC address that would also be
> trapped by the switch to the CPU, were it to receive it on a front-panel
> port, meta frames are conceptually not link-local frames, they only
> carry their RX timestamps.
>
> The choice of sending meta frames at a multicast DMAC is a pragmatic
> one, to avoid installing an extra entry to the DSA master port's
> multicast MAC filter.
>
> Signed-off-by: Vladimir Oltean <olteanv@...il.com>
> ---
> Changes in v2:
>
> Patch is new.
>
>  include/linux/dsa/sja1105.h | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/include/linux/dsa/sja1105.h b/include/linux/dsa/sja1105.h
> index f3237afed35a..d64e56d6c521 100644
> --- a/include/linux/dsa/sja1105.h
> +++ b/include/linux/dsa/sja1105.h
> @@ -31,6 +31,8 @@ static inline bool sja1105_is_link_local(const struct sk_buff *skb)
>         const struct ethhdr *hdr = eth_hdr(skb);
>         u64 dmac = ether_addr_to_u64(hdr->h_dest);
>
> +       if (ntohs(hdr->h_proto) == ETH_P_SJA1105_META)
> +               return false;
>         if ((dmac & SJA1105_LINKLOCAL_FILTER_A_MASK) ==
>                     SJA1105_LINKLOCAL_FILTER_A)
>                 return true;
> --
> 2.17.1
>

Please be aware that this patch is misplaced and should be moved after
the current 09/10 (doesn't compile as 08/10).
I'll bundle this change in v3 with the other feedback I'll hopefully get.

Thanks!
-Vladimir