Date:   Mon, 22 Jun 2020 14:31:55 +0200
From:   Marek Behun <marek.behun@....cz>
To:     ѽ҉ᶬḳ℠ <vtol@....net>
Cc:     netdev@...r.kernel.org, Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>
Subject: Re: secondary CPU port facing switch does not come up/online

TurrisOS has patches adding multi-CPU DSA support, look at those if you
want this functionality.

These patches apply on openwrt, after patching there should be kernel
patches created in target/linux/mvebu/patches-{4.14,5.4}

For 4.14 kernel:
https://gitlab.labs.nic.cz/turris/turris-build/-/blob/hbd/patches/openwrt/wip/0009-mvebu-turris-omnia-multi-cpu-dsa.patch

(this creates
target/linux/mvebu/patches-4.14/90500-net-dsa-multi-cpu.patch
target/linux/mvebu/patches-4.14/90501-omnia-dts-dsa-multi-cpu.patch
)

For 5.4 kernel:
https://gitlab.labs.nic.cz/turris/turris-build/-/blob/fix/hbd-omnia-5.4-kernel/patches/openwrt/wip/0005-mvebu-initial-support-for-Omnia-on-5.4-kernel.patch

(this creates
target/linux/mvebu/patches-5.4/9950-net-dsa-allow-for-multiple-CPU-ports.patch
target/linux/mvebu/patches-5.4/9951-net-add-ndo-for-setting-the-iflink-property.patch
target/linux/mvebu/patches-5.4/9952-net-dsa-implement-ndo_set_netlink-for-chaning-port-s.patch
target/linux/mvebu/patches-5.4/9953-net-dsa-mv88e6xxx-support-multi-CPU-DSA.patch
)

On Mon, 22 Jun 2020 07:39:00 +0000
ѽ҉ᶬḳ℠ <vtol@....net> wrote:

> On 21/06/2020 21:08, Florian Fainelli wrote:
> > Le 2020-06-21 à 13:24, ѽ҉ᶬḳ℠ a écrit :  
> >> {"kernel":"5.4.46","hostname":"OpenWrt","system":"ARMv7 Processor rev 1
> >> (v7l)","model":"Turris
> >> Omnia","board_name":"cznic,turris-omnia","release":{"distribution":"OpenWrt","version":"SNAPSHOT","revision":"r13600-9a477b833a","target":"mvebu/cortexa9","description":"OpenWrt
> >> SNAPSHOT r13600-9a477b833a"}}
> >> _____
> >>
> >> With the below cited DT both CPU ports facing the node's build-in switch
> >> are brought online at boot time with kernel 4.14 but since having
> >> switched to kernel 5.4 only one CPU port gets online. It is as if the
> >> kernel discards the presence of the secondary CPU port. Kernel log only
> >> prints for the offline port just a single entry:
> >>
> >> mvneta f1070000.ethernet eth0: Using hardware mac address
> >>
> >> Swapping eth1 to port6 and eth0 to port6 then eth0 is brought online but
> >> eth1 is not. Removing port5 then the port6 listed port is brought
> >> up/online.
> >>
> >> Once the node is booted the offline port can brought up with ip l set
> >> up. This seems like a regression bug in between the kernel versions.  
> > There can only be one CPU port at a time active right now, so I am not
> > sure why it even worked with kernel 4.14.  
> 
> What is the reasoning, because DSA is not coded to handle multi-ports? 
> DSA can be patched downstream (proposed patches to mainline kernel were 
> not accepted) and is so is for the 4.14 instance but there is DSA patch 
> available for the 5.4 instance yet. That aside I would assume that DSA 
> is not in charge of handling the state of the CPU ports but rather PHY 
> or PHYLINK?
> 
> I understand that dual CPU port chipset design is somewhat unusual but 
> it is something unique and therefore a fringe case that is not supported 
> by the kernel?
> 
> >   Could you please share kernel
> > logs and the output of ip link show in both working/non-working cases?  
> 
> Sure, does the ML accept attachments, if so which format, or you want 
> two full kernel logs in the message body? Meantime, the short version:
> 
> 4.14
> dmesg -t | grep mvneta
> mvneta f1070000.ethernet eth0: Using hardware mac address d8:58:d7:00:79:7c
> mvneta f1030000.ethernet eth1: Using hardware mac address d8:58:d7:00:79:7a
> mvneta f1034000.ethernet eth2: Using hardware mac address d8:58:d7:00:79:7b
> mvneta f1034000.ethernet eth2: switched to 802.3z/1000base-x link mode
> mvneta f1070000.ethernet eth0: configuring for fixed/rgmii link mode
> mvneta f1070000.ethernet eth0: Link is Up - 1Gbps/Full - flow control off
> mvneta f1030000.ethernet eth1: Disable IP checksum for MTU greater than 
> 1600B
> mvneta f1030000.ethernet eth1: configuring for fixed/rgmii link mode
> mvneta f1030000.ethernet eth1: Link is Up - 1Gbps/Full - flow control off
> mvneta f1034000.ethernet eth2: configuring for 802.3z/1000base-x link mode
> mvneta f1034000.ethernet eth2: Link is Up - 1Gbps/Full - flow control off
> mvneta f1034000.ethernet eth2: Link is Down
> mvneta f1034000.ethernet eth2: configuring for 802.3z/1000base-x link mode
> mvneta f1034000.ethernet eth2: Link is Up - 1Gbps/Full - flow control off
> mvneta f1034000.ethernet eth2: Link is Down
> mvneta f1034000.ethernet eth2: configuring for 802.3z/1000base-x link mode
> mvneta f1034000.ethernet eth2: Link is Up - 1Gbps/Full - flow control off
> 
> 5.4
> dmesg -t | grep mvneta
> mvneta f1070000.ethernet eth0: Using hardware mac address d8:58:d7:00:79:7c
> mvneta f1030000.ethernet eth1: Using hardware mac address d8:58:d7:00:79:7a
> mvneta f1034000.ethernet eth2: Using hardware mac address d8:58:d7:00:79:7b
> mvneta f1034000.ethernet eth2: switched to inband/1000base-x link mode
> mvneta f1030000.ethernet eth1: Disable IP checksum for MTU greater than 
> 1600B
> mvneta f1030000.ethernet eth1: configuring for fixed/rgmii link mode
> mvneta f1030000.ethernet eth1: Link is Up - 1Gbps/Full - flow control off
> mvneta f1034000.ethernet eth2: configuring for inband/1000base-x link mode
> mvneta f1034000.ethernet eth2: Link is Up - 1Gbps/Full - flow control off
> mvneta f1034000.ethernet eth2: Link is Down
> mvneta f1034000.ethernet eth2: configuring for inband/1000base-x link mode
> mvneta f1034000.ethernet eth2: configuring for inband/1000base-x link mode
> mvneta f1034000.ethernet eth2: Link is Up - 1Gbps/Full - flow control off
> mvneta f1034000.ethernet eth2: Link is Down
> mvneta f1034000.ethernet eth2: configuring for inband/1000base-x link mode
> mvneta f1034000.ethernet eth2: configuring for inband/1000base-x link mode
> mvneta f1034000.ethernet eth2: Link is Up - 1Gbps/Full - flow control off
> 
> 

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