linux-kernel - Re: [PATCH ethtool v2 3/3] ethtool: pse-pd: Add PSE event monitoring support

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Message-ID: <20250813152240.3b6e7708@kmaincent-XPS-13-7390>
Date: Wed, 13 Aug 2025 15:22:40 +0200
From: Kory Maincent <kory.maincent@...tlin.com>
To: Oleksij Rempel <o.rempel@...gutronix.de>
Cc: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
 <pabeni@...hat.com>, Andrew Lunn <andrew@...n.ch>, Michal Kubecek
 <mkubecek@...e.cz>, Dent Project <dentproject@...uxfoundation.org>, Kyle
 Swenson <kyle.swenson@....tech>, Thomas Petazzoni
 <thomas.petazzoni@...tlin.com>, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH ethtool v2 3/3] ethtool: pse-pd: Add PSE event
 monitoring support

Le Wed, 13 Aug 2025 14:44:27 +0200,
Oleksij Rempel <o.rempel@...gutronix.de> a écrit :

> > +int pse_ntf_cb(const struct nlmsghdr *nlhdr, void *data)
> > +{
> > +	const struct nlattr *tb[ETHTOOL_A_PSE_MAX + 1] = {};  
> 
> s/ETHTOOL_A_PSE_MAX/ETHTOOL_A_PSE_NTF_MAX ?

Thanks, well spotted.

> > +	struct nl_context *nlctx = data;
> > +	DECLARE_ATTR_TB_INFO(tb);
> > +	u64 val;
> > +	int ret, i;
> > +
> > +	ret = mnl_attr_parse(nlhdr, GENL_HDRLEN, attr_cb, &tb_info);
> > +	if (ret < 0)
> > +		return MNL_CB_OK;
> > +
> > +	if (!tb[ETHTOOL_A_PSE_NTF_EVENTS])
> > +		return MNL_CB_OK;
> > +
> > +	nlctx->devname = get_dev_name(tb[ETHTOOL_A_PSE_HEADER]);  
> 
> s/ETHTOOL_A_PSE_HEADER/ETHTOOL_A_PSE_NTF_HEADER ?

Thanks, well spotted.

> > +	if (!dev_ok(nlctx))
> > +		return MNL_CB_OK;
> > +
> > +	open_json_object(NULL);
> > +	print_string(PRINT_ANY, "ifname", "PSE event for %s:\n",
> > +		     nlctx->devname);
> > +	open_json_array("events", "Events:");
> > +	val = attr_get_uint(tb[ETHTOOL_A_PSE_NTF_EVENTS]);  
> 
> we have here uint but val is u64, is it as expected?

Yes, same behavior in Linux using nla_put_uint().

> > +	for (i = 0; 1 << i <= ETHTOOL_PSE_EVENT_SW_PW_CONTROL_ERROR; i++)
> > +		if (val & 1 << i)
> > +			print_string(PRINT_ANY, NULL, " %s",
> > +				     pse_events_name(val & 1 << i));  
> 
> Hm, may be it is better to not limit to ETHTOOL_PSE_EVENT_SW_PW_CONTROL_ERROR
> and report unknow numeric value. It will keep even old ethtool at least
> partially usable.

Ok, I will loop until UINT_MAX then.

Regards,
-- 
Köry Maincent, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com