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From:   "Bedel, Alban" <alban.bedel@aerq.com>
To:     "vladimir.oltean@nxp.com" <vladimir.oltean@nxp.com>
CC:     "claudiu.manoil@nxp.com" <claudiu.manoil@nxp.com>,
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Subject: Re: [PATCH] net: mscc: ocelot: Fix multicast to the CPU port
Thread-Topic: [PATCH] net: mscc: ocelot: Fix multicast to the CPU port
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Date:   Tue, 19 Jan 2021 10:12:34 +0000
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On Mon, 2021-01-18 at 18:55 +0000, Vladimir Oltean wrote:
> Hi Alban,
>=20
> On Mon, Jan 18, 2021 at 05:03:17PM +0100, Alban Bedel wrote:
> > Multicast entries in the MAC table use the high bits of the MAC
> > address to encode the ports that should get the packets. But this
> > port
> > mask does not work for the CPU port, to receive these packets on
> > the
> > CPU port the MAC_CPU_COPY flag must be set.
> >=20
> > Because of this IPv6 was effectively not working because neighbor
> > solicitations were never received. This was not apparent before
> > commit
> > 9403c158 (net: mscc: ocelot: support IPv4, IPv6 and plain Ethernet
> > mdb
> > entries) as the IPv6 entries were broken so all incoming IPv6
> > multicast was then treated as unknown and flooded on all ports.
> >=20
> > To fix this problem add a new `flags` parameter to
> > ocelot_mact_learn()
> > and set MAC_CPU_COPY when the CPU port is in the port set. We still
> > leave the CPU port in the bitfield as it doesn't seems to hurt.
> >=20
> > Signed-off-by: Alban Bedel <alban.bedel@aerq.com>
> > Fixes: 9403c158 (net: mscc: ocelot: support IPv4, IPv6 and plain
> > Ethernet mdb entries)
> > ---
>=20
> Good catch, it seems that I really did not test that patch with
> multicast traffic received on the CPU (and not only that patch, but
> ever
> since, in fact), shame on me.
>=20
> What I don't like your patch is how it spills over the entire ocelot
> driver, yet still fails to compile. You missed a bunch of
> ocelot_mact_learn calls from ocelot_net.c (8 of them, in fact).
> I don't know which kernel tree you applied this patch to, but clearly
> not "net"/master:
> https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git

My board use felix and I build without CONFIG_MSCC_OCELOT_SWITCH so I
missed these, my bad.

> I would prefer to see a more self-contained bug fix, such as
> potentially
> this one:
>=20
> -----------------------------[cut here]-----------------------------
> diff --git a/drivers/net/ethernet/mscc/ocelot.c
> b/drivers/net/ethernet/mscc/ocelot.c
> index a560d6be2a44..4d7443b123bd 100644
> --- a/drivers/net/ethernet/mscc/ocelot.c
> +++ b/drivers/net/ethernet/mscc/ocelot.c
> @@ -56,18 +56,46 @@ static void ocelot_mact_select(struct ocelot
> *ocelot,
> =20
>  }
> =20
> +static unsigned long
> +ocelot_decode_ports_from_mdb(const unsigned char *addr,
> +			     enum macaccess_entry_type entry_type)
> +{
> +	unsigned long ports =3D 0;
> +
> +	if (entry_type =3D=3D ENTRYTYPE_MACv4) {
> +		ports =3D addr[2];
> +		ports |=3D addr[1] << 8;
> +	} else if (entry_type =3D=3D ENTRYTYPE_MACv6) {
> +		ports =3D addr[1];
> +		ports |=3D addr[0] << 8;
> +	}
> +
> +	return ports;
> +}
> +
>  int ocelot_mact_learn(struct ocelot *ocelot, int port,
>  		      const unsigned char mac[ETH_ALEN],
>  		      unsigned int vid, enum macaccess_entry_type type)
>  {
> +	u32 flags =3D ANA_TABLES_MACACCESS_VALID |
> +		    ANA_TABLES_MACACCESS_DEST_IDX(port) |
> +		    ANA_TABLES_MACACCESS_ENTRYTYPE(type) |
> +		    ANA_TABLES_MACACCESS_MAC_TABLE_CMD(MACACCESS_CMD_LE
> ARN);
> +
>  	ocelot_mact_select(ocelot, mac, vid);
> =20
> +	/* Little API trickery to make this function "just work" when
> the CPU
> +	 * port module is included in the port mask for multicast IP
> entries.
> +	 */
> +	if (type =3D=3D ENTRYTYPE_MACv4 || type =3D=3D ENTRYTYPE_MACv6) {
> +		unsigned long ports =3D ocelot_decode_ports_from_mdb(mac,
> type);
> +
> +		if (ports & BIT(ocelot->num_phys_ports))
> +			flags |=3D ANA_TABLES_MACACCESS_MAC_CPU_COPY;
> +	}
> +
>  	/* Issue a write command */
> -	ocelot_write(ocelot, ANA_TABLES_MACACCESS_VALID |
> -			     ANA_TABLES_MACACCESS_DEST_IDX(port) |
> -			     ANA_TABLES_MACACCESS_ENTRYTYPE(type) |
> -			     ANA_TABLES_MACACCESS_MAC_TABLE_CMD(MACACCE
> SS_CMD_LEARN),
> -			     ANA_TABLES_MACACCESS);
> +	ocelot_write(ocelot, flags, ANA_TABLES_MACACCESS);
> =20
>  	return ocelot_mact_wait_for_completion(ocelot);
>  }
> -----------------------------[cut here]-----------------------------
>=20
> It has the advantage of actually compiling, plus it should be easier
> to backport because the changes are all in one place.
>=20
>=20
> Please make sure to read:
> Documentation/process/submitting-patches.rst
> (this will tell you what is wrong with your Fixes: tag)
> Documentation/networking/netdev-FAQ.rst
> (this will tell you what is wrong with this patch's --subject-prefix,
> and why the patch does not build on the trees it is supposed to be
> applied to):
> https://patchwork.kernel.org/project/netdevbpf/patch/20210118160317.55401=
8-1-alban.bedel@aerq.com/

I must say that this condescending tone is a real turn off.

Alban

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