linux-kernel - Re: drivers/net/dsa/dsa_loop

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Date: Wed, 15 May 2024 12:26:58 -0700
From: Florian Fainelli <f.fainelli@...il.com>
To: Stephen Langstaff <stephenlangstaff1@...il.com>,
 Andrew Lunn <andrew@...n.ch>
Cc: linux-kernel@...r.kernel.org, OlteanV@...il.com
Subject: Re: drivers/net/dsa/dsa_loop_bdinfo.c build problems

On 5/15/24 02:23, Stephen Langstaff wrote:
> On Tue, May 14, 2024 at 5:17 PM Andrew Lunn <andrew@...n.ch> wrote:
>>
>> On Tue, May 14, 2024 at 05:08:24PM +0100, Stephen Langstaff wrote:
>>> If I sorted out building the dsa_loop_bdinfo.c code as a built-in do
>>> you think that would solve the ordering issue?
>>
>> Probably.
> 
> Well, some minor progress... when dsa_loop and dsa_loop_bdinfo are
> built-in to the kernel then it appears that, at least for this
> configuration, the driver probe function is called:
> 
> [    0.053068] dsa_loop_bdinfo_init
> [    1.509255] dsa_loop_init
> [    1.513178] dsa_loop_drv_probe
> [    2.633673] dsa_loop_drv_probe
> ...
> [    3.273496] dsa_loop_drv_probe
> [    3.276589] dsa_loop_get_protocol
> [    3.281608] dsa-loop fixed-0:1f: skipping link registration for CPU port 5
> [    3.288558]  (null): phylink: error: empty supported_interfaces
> [    3.294500] error creating PHYLINK: -22
> [    3.298343] dsa-loop fixed-0:1f lan1 (uninitialized): error -22
> setting up PHY for tree 0, switch 0, port 0
> [    3.308145]  (null): phylink: error: empty supported_interfaces
> [    3.314070] error creating PHYLINK: -22
> [    3.317907] dsa-loop fixed-0:1f lan2 (uninitialized): error -22
> setting up PHY for tree 0, switch 0, port 1
> [    3.327677]  (null): phylink: error: empty supported_interfaces
> [    3.333609] error creating PHYLINK: -22
> [    3.337449] dsa-loop fixed-0:1f lan3 (uninitialized): error -22
> setting up PHY for tree 0, switch 0, port 2
> [    3.347223]  (null): phylink: error: empty supported_interfaces
> [    3.353145] error creating PHYLINK: -22
> [    3.356983] dsa-loop fixed-0:1f lan4 (uninitialized): error -22
> setting up PHY for tree 0, switch 0, port 3
> [    3.366855] device eth0 entered promiscuous mode
> [    3.371497] DSA: tree 0 setup
> [    3.374474] dsa-loop fixed-0:1f: DSA mockup driver: 0x1f
> 
> The -22 error appears to be related to the issues mentioned here:
> https://www.spinics.net/lists/netdev/msg922961.html so I will now try
> to apply the suggested short-term fix.

What changes have you done to the dsa_loop.c file for this error to show 
up? Currently the driver does the following:

static void dsa_loop_phylink_get_caps(struct dsa_switch *dsa, int port,
                                         struct phylink_config *config)
   {
           bitmap_fill(config->supported_interfaces, 
PHY_INTERFACE_MODE_MAX);
           __clear_bit(PHY_INTERFACE_MODE_NA, config->supported_interfaces);
           config->mac_capabilities = ~0;
   }

which is basically to say: I support everything, except 
PHY_INTERFACE_MDOE_NA.
-- 
Florian