Re: [PATCH v2 devicetree 2/2] powerpc: dts: t1040rdb: add ports for Seville Ethernet switch

[Vladimir Oltean]

On Tue, Sep 29, 2020 at 10:10:48PM +0200, Andrew Lunn wrote:
> On Tue, Sep 29, 2020 at 07:39:54PM +0000, Vladimir Oltean wrote:
> > On Tue, Sep 29, 2020 at 09:11:53PM +0200, Andrew Lunn wrote:
> > > > +&seville_port0 {
> > > > +	managed = "in-band-status";
> > > > +	phy-handle = <&phy_qsgmii_0>;
> > > > +	phy-mode = "qsgmii";
> > > > +	/* ETH4 written on chassis */
> > > > +	label = "swp4";
> > >
> > > If ETH4 is on the chassis why not use ETH4?
> >
> > You mean all-caps, just like that?
>
> Yes.
>
> DSA is often used in WiFI access point, etc. The user is not a
> computer professional. If the WebGUI says ETH4, and the label on the
> front says ETH4, they probably think the two are the same, and are
> happy.
>
> I have one box which does not have an labels on the front panels, but
> the industrial sockets for Ethernet are colour coded. So the interface
> names are red, blue, green, to match the socket colour, and the cable
> set is also colour coded the same.
>
> So long as it is unique, the kernel does not care. So make it easy for
> the user.

It would look like this:

[root@T1040 ~] # ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: dummy0: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
    link/ether de:91:41:1a:92:b8 brd ff:ff:ff:ff:ff:ff
3: fm1-gb3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000
    link/ether 00:1f:7b:6a:02:68 brd ff:ff:ff:ff:ff:ff
4: fm1-gb4: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN mode DEFAULT group default qlen 1000
    link/ether 00:1f:7b:6a:02:88 brd ff:ff:ff:ff:ff:ff
5: fm1-gb0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1504 qdisc mq state UP mode DEFAULT group default qlen 1000
    link/ether 00:1f:7b:6a:02:08 brd ff:ff:ff:ff:ff:ff
6: fm1-gb1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000
    link/ether 00:1f:7b:6a:02:28 brd ff:ff:ff:ff:ff:ff
7: fm1-gb2: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN mode DEFAULT group default qlen 1000
    link/ether 00:1f:7b:6a:02:48 brd ff:ff:ff:ff:ff:ff
8: tunl0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/ipip 0.0.0.0 brd 0.0.0.0
9: sit0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN mode DEFAULT group default qlen 1000
    link/sit 0.0.0.0 brd 0.0.0.0
10: ETH4@fm1-gb0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000
    link/ether 00:1f:7b:6a:02:08 brd ff:ff:ff:ff:ff:ff
11: ETH5@fm1-gb0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state LOWERLAYERDOWN mode DEFAULT group default qlen 1000
    link/ether 00:1f:7b:6a:02:08 brd ff:ff:ff:ff:ff:ff
12: ETH6@fm1-gb0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state LOWERLAYERDOWN mode DEFAULT group default qlen 1000
    link/ether 00:1f:7b:6a:02:08 brd ff:ff:ff:ff:ff:ff
13: ETH7@fm1-gb0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state LOWERLAYERDOWN mode DEFAULT group default qlen 1000
    link/ether 00:1f:7b:6a:02:08 brd ff:ff:ff:ff:ff:ff
14: ETH8@fm1-gb0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state LOWERLAYERDOWN mode DEFAULT group default qlen 1000
    link/ether 00:1f:7b:6a:02:08 brd ff:ff:ff:ff:ff:ff
15: ETH9@fm1-gb0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state LOWERLAYERDOWN mode DEFAULT group default qlen 1000
    link/ether 00:1f:7b:6a:02:08 brd ff:ff:ff:ff:ff:ff
16: ETH10@fm1-gb0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state LOWERLAYERDOWN mode DEFAULT group default qlen 1000
    link/ether 00:1f:7b:6a:02:08 brd ff:ff:ff:ff:ff:ff
17: ETH11@fm1-gb0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state LOWERLAYERDOWN mode DEFAULT group default qlen 1000
    link/ether 00:1f:7b:6a:02:08 brd ff:ff:ff:ff:ff:ff
[root@T1040 ~] # ip link set ETH4 down
[   94.942190] mscc_seville ffe800000.ethernet-switch ETH4: Link is Down
[root@T1040 ~] # ip link set ETH4 up
[  100.262533] mscc_seville ffe800000.ethernet-switch ETH4: configuring for inband/qsgmii link mode
[  100.272122] 8021q: adding VLAN 0 to HW filter on device ETH4
[  103.333369] mscc_seville ffe800000.ethernet-switch ETH4: Link is Up - 1Gbps/Full - flow control rx/tx
[  103.342697] IPv6: ADDRCONF(NETDEV_CHANGE): ETH4: link becomes ready

I'm not in love, but I guess at least there won't be any doubt if they
are named like this. I'm sending another revision with these names soon.

Thanks,
-Vladimir