linux-kernel - Re: [PATCH net-next 02/11] net: dsa: add debugfs interface

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Date:   Tue, 15 Aug 2017 10:29:04 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
        netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel@...oirfairelinux.com,
        "David S. Miller" <davem@...emloft.net>,
        Andrew Lunn <andrew@...n.ch>,
        Egil Hjelmeland <privat@...l-hjelmeland.no>,
        John Crispin <john@...ozen.org>,
        Woojung Huh <Woojung.Huh@...rochip.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Volodymyr Bendiuga <volodymyr.bendiuga@...il.com>,
        Nikita Yushchenko <nikita.yoush@...entembedded.com>,
        Maxime Hadjinlian <maxime@...ialet.com>,
        Chris Healy <cphealy@...il.com>,
        Maxim Uvarov <muvarov@...il.com>,
        Stefan Eichenberger <eichest@...il.com>,
        Jason Cobham <jcobham@...stertangent.com>,
        Juergen Borleis <jbe@...gutronix.de>,
        Tobias Waldekranz <tobias@...dekranz.com>
Subject: Re: [PATCH net-next 02/11] net: dsa: add debugfs interface



On 08/14/2017 03:22 PM, Vivien Didelot wrote:
> This commit adds a DEBUG_FS dependent DSA core file creating a generic
> debug filesystem interface for the DSA switch devices.
> 
> The interface can be mounted with:
> 
>     # mount -t debugfs none /sys/kernel/debug
> 
> The dsa directory contains one directory per switch chip:
> 
>     # cd /sys/kernel/debug/dsa/
>     # ls
>     switch0  switch1 switch2
> 
> Each chip directory contains one directory per port:
> 
>     # ls -l switch0/
>     drwxr-xr-x 2 root root 0 Jan  1 00:00 port0
>     drwxr-xr-x 2 root root 0 Jan  1 00:00 port1
>     drwxr-xr-x 2 root root 0 Jan  1 00:00 port2
>     drwxr-xr-x 2 root root 0 Jan  1 00:00 port5
>     drwxr-xr-x 2 root root 0 Jan  1 00:00 port6
> 
> Future patches will add entry files to these directories.
> 
> Signed-off-by: Vivien Didelot <vivien.didelot@...oirfairelinux.com>
> ---

> +static int dsa_debugfs_create_switch(struct dsa_switch *ds)
> +{
> +	char name[32];
> +	int i;
> +
> +	/* skip if there is no debugfs support */
> +	if (!dsa_debugfs_dir)
> +		return 0;
> +
> +	snprintf(name, sizeof(name), DSA_SWITCH_FMT, ds->index);
> +
> +	ds->debugfs_dir = debugfs_create_dir(name, dsa_debugfs_dir);
> +	if (IS_ERR_OR_NULL(ds->debugfs_dir))
> +		return -EFAULT;
> +
> +	for (i = 0; i < ds->num_ports; i++) {
> +		if (!ds->ports[i].dn)
> +			continue;

This won't create port directories when using platform data, can you
check for BIT(i) & ds->enabled_port_mask instead?
-- 
Florian