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Date:   Wed, 11 Dec 2019 14:11:11 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Baruch Siach <baruch@...s.co.il>
Cc:     Vivien Didelot <vivien.didelot@...il.com>, netdev@...r.kernel.org,
        Denis Odintsov <d.odintsov@...viangames.com>
Subject: Re: [BUG] mv88e6xxx: tx regression in v5.3

On Wed, Dec 11, 2019 at 11:48:57AM +0200, Baruch Siach wrote:
> Hi Andrew, Vivien,
> 
> Since kernel v5.3 (tested v5.3.15), the 88E6141 switch on SolidRun
> Clearfog GT-8K stopped transmitting packets on switch connected
> ports. Kernel v5.2 works fine (tested v5.2.21).
> 
> Here are the relevant kernel v5.3 log lines:
> 
> [    2.867424] mv88e6085 f412a200.mdio-mii:04: switch 0x3400 detected: Marvell 88E6141, revision 0
> [    2.927445] libphy: mdio: probed
> [    3.578496] mv88e6085 f412a200.mdio-mii:04 lan2 (uninitialized): PHY [!cp1!config-space@...00000!mdio@...200!switch0@...dio:11] driver [Marvell 88E6390]
> [    3.595674] mv88e6085 f412a200.mdio-mii:04 lan1 (uninitialized): PHY [!cp1!config-space@...00000!mdio@...200!switch0@...dio:12] driver [Marvell 88E6390]
> [    3.612797] mv88e6085 f412a200.mdio-mii:04 lan4 (uninitialized): PHY [!cp1!config-space@...00000!mdio@...200!switch0@...dio:13] driver [Marvell 88E6390]
> [    3.629910] mv88e6085 f412a200.mdio-mii:04 lan3 (uninitialized): PHY [!cp1!config-space@...00000!mdio@...200!switch0@...dio:14] driver [Marvell 88E6390]
> [    3.646049] mv88e6085 f412a200.mdio-mii:04: configuring for phy/ link mode
> [    3.654451] DSA: tree 0 setup
> ...
> [   10.784521] mvpp2 f4000000.ethernet eth2: configuring for fixed/2500base-x link mode
> [   10.792401] mvpp2 f4000000.ethernet eth2: Link is Up - 2.5Gbps/Full - flow control off
> [   19.817981] mv88e6085 f412a200.mdio-mii:04 lan1: configuring for phy/ link mode
> [   19.827083] 8021q: adding VLAN 0 to HW filter on device lan1
> [   21.577276] mv88e6085 f412a200.mdio-mii:04 lan1: Link is Up - 100Mbps/Full - flow control rx/tx
> [   21.586030] IPv6: ADDRCONF(NETDEV_CHANGE): lan1: link becomes ready
> 
> The Tx count on the lan1 interface increments, but the ARP packets don't 
> show on the network.

Hi Baruch

I don't know of an issues.

If the MAC TX counter increases, it sounds like it is a PHY issue?
Does 100Mbps/Full make sense for this link?

Probably your best bet is to do a git bisect to find which commit
broke it.

      Andrew

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