linux-kernel - Re: [Patch net-next v2 0/9] net: dsa: microchip: add support for phylink mac config and link up

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Message-ID: <20220830065533.GA18106@pengutronix.de>
Date:   Tue, 30 Aug 2022 08:55:33 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Arun Ramadoss <arun.ramadoss@...rochip.com>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Woojung Huh <woojung.huh@...rochip.com>,
        UNGLinuxDriver@...rochip.com, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Russell King <linux@...linux.org.uk>,
        Søren Andersen <san@...v.dk>
Subject: Re: [Patch net-next v2 0/9] net: dsa: microchip: add support for
 phylink mac config and link up

Hi Arun,

starting with this patch set I have following regression on ksz8873
switch. Can you please take a look at it:
 8<--- cut here ---
 Unable to handle kernel NULL pointer dereference at virtual address 00000005
 ksz8863-switch gpio-0:00: nonfatal error -34 setting MTU to 1500 on port 0
...
 Modules linked in:                                          
 CPU: 0 PID: 16 Comm: kworker/0:1 Not tainted 6.0.0-rc2-00436-g3da285df1324 #74
 Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree)
 Workqueue: events_power_efficient phylink_resolve
 PC is at ksz_set_gbit+0x5c/0xa4
 LR is at arch_atomic_cmpxchg_relaxed+0x1c/0x38
....
 Backtrace: 
  ksz_set_gbit from ksz_phylink_mac_link_up+0x15c/0x1c8
  ksz_phylink_mac_link_up from dsa_port_phylink_mac_link_up+0x7c/0x80
  dsa_port_phylink_mac_link_up from phylink_resolve+0x304/0x3d0
  phylink_resolve from process_one_work+0x214/0x31c
  process_one_work from worker_thread+0x254/0x2d4
  worker_thread from kthread+0xfc/0x108
  kthread from ret_from_fork+0x14/0x2c
...
 ksz8863-switch gpio-0:00 lan2 (uninitialized): PHY [dsa-0.0:01] driver [Micrel KSZ8851 Ethernet MAC or KSZ886X Switch] (irq=POLL)
 ksz8863-switch gpio-0:00: nonfatal error -34 setting MTU to 1500 on port 1
 device eth0 entered promiscuous mode
 DSA: tree 0 setup
 ---[ end trace 0000000000000000 ]---

Regards,
Oleksij

On Sun, Jul 24, 2022 at 02:58:14PM +0530, Arun Ramadoss wrote:
> This patch series add support common phylink mac config and link up for the ksz
> series switches. At present, ksz8795 and ksz9477 doesn't implement the phylink
> mac config and link up. It configures the mac interface in the port setup hook.
> ksz8830 series switch does not mac link configuration. For lan937x switches, in
> the part support patch series has support only for MII and RMII configuration.
> Some group of switches have some register address and bit fields common and
> others are different. So, this patch aims to have common phylink implementation
> which configures the register based on the chip id.

> Changes in v2
> - combined the modification of duplex, tx_pause and rx_pause into single
>   function.
> 
> Changes in v1
> - Squash the reading rgmii value from dt to patch which apply the rgmii value
> - Created the new function ksz_port_set_xmii_speed
> - Seperated the namespace values for xmii_ctrl_0 and xmii_ctrl_1 register
> - Applied the rgmii delay value based on the rx/tx-internal-delay-ps
> 
> Arun Ramadoss (9):
>   net: dsa: microchip: add common gigabit set and get function
>   net: dsa: microchip: add common ksz port xmii speed selection function
>   net: dsa: microchip: add common duplex and flow control function
>   net: dsa: microchip: add support for common phylink mac link up
>   net: dsa: microchip: lan937x: add support for configuing xMII register
>   net: dsa: microchip: apply rgmii tx and rx delay in phylink mac config
>   net: dsa: microchip: ksz9477: use common xmii function
>   net: dsa: microchip: ksz8795: use common xmii function
>   net: dsa: microchip: add support for phylink mac config
> 
>  drivers/net/dsa/microchip/ksz8795.c      |  40 ---
>  drivers/net/dsa/microchip/ksz8795_reg.h  |   8 -
>  drivers/net/dsa/microchip/ksz9477.c      | 183 +------------
>  drivers/net/dsa/microchip/ksz9477_reg.h  |  24 --
>  drivers/net/dsa/microchip/ksz_common.c   | 312 ++++++++++++++++++++++-
>  drivers/net/dsa/microchip/ksz_common.h   |  54 ++++
>  drivers/net/dsa/microchip/lan937x.h      |   8 +-
>  drivers/net/dsa/microchip/lan937x_main.c | 125 +++------
>  drivers/net/dsa/microchip/lan937x_reg.h  |  32 ++-
>  9 files changed, 431 insertions(+), 355 deletions(-)
> 
> 
> base-commit: 502c6f8cedcce7889ccdefeb88ce36b39acd522f
> -- 
> 2.36.1
> 

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