linux-kernel - Re: [PATCH v3 4/5] net: hpe: Add GXP UMAC Driver

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Date:   Thu, 17 Aug 2023 21:44:03 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     "Hawkins, Nick" <nick.hawkins@....com>
Cc:     "christophe.jaillet@...adoo.fr" <christophe.jaillet@...adoo.fr>,
        "simon.horman@...igine.com" <simon.horman@...igine.com>,
        "Verdun, Jean-Marie" <verdun@....com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "conor+dt@...nel.org" <conor+dt@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 4/5] net: hpe: Add GXP UMAC Driver

> > > +	if (length > 1514) {
> > > +		netdev_err(ndev, "send data %d bytes > 1514, clamp it to 1514\n",
> > > +			   skb->len);
> 
> > Than should be rate limited.
> 
> How is this done? Is there a particular function to call that
> will handle it in the backend?

Sorry, i was ambiguous. I meant the netdev_err() should be rate
limited, otherwise some user space application could DOS your system
by sending big packets at line rate flooding your logs.

   Andrew