From: Stephen Hemminger <stephen@networkplumber.org>
To: Jarod Wilson <jarod@redhat.com>
Cc: David Miller <davem@davemloft.net>, netdev@vger.kernel.org
Subject: Re: Minimum MTU Mess
Date: Wed, 7 Sep 2016 13:35:35 -0700 [thread overview]
Message-ID: <20160907133535.2cfac7bc@xeon-e3> (raw)
In-Reply-To: <20160907195356.GX33916@redhat.com>
On Wed, 7 Sep 2016 15:53:56 -0400
Jarod Wilson <jarod@redhat.com> wrote:
> --- a/net/core/dev.c
> +++ b/net/core/dev.c
> @@ -6466,9 +6466,17 @@ int dev_set_mtu(struct net_device *dev, int new_mtu)
> if (new_mtu == dev->mtu)
> return 0;
>
> - /* MTU must be positive. */
> - if (new_mtu < 0)
> + if (new_mtu < dev->min_mtu) {
> + netdev_err(dev, "Invalid MTU %d requested, hw min %d\n",
> + new_mtu, dev->min_mtu);
> return -EINVAL;
> + }
> +
> + if (new_mtu > dev->max_mtu) {
> + netdev_err(dev, "Invalid MTU %d requested, hw max %d\n",
> + new_mtu, dev->min_mtu);
> + return -EINVAL;
> + }
>
Maybe don't log something that can be triggered from a user program.
Or at least rate limit it.
next prev parent reply other threads:[~2016-09-07 20:35 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-02 17:07 Minimum MTU Mess Jarod Wilson
2016-09-06 16:50 ` [PATCH net-next] sfc: check MTU against minimum threshold Bert Kenward
2016-09-06 21:31 ` Jarod Wilson
2016-09-06 23:54 ` David Miller
2016-09-06 23:55 ` Minimum MTU Mess David Miller
2016-09-07 19:53 ` Jarod Wilson
2016-09-07 20:31 ` Andrew Lunn
2016-09-07 23:43 ` Jarod Wilson
2016-09-08 1:24 ` Andrew Lunn
2016-09-09 18:05 ` Jarod Wilson
2016-09-12 2:41 ` Andrew Lunn
2016-09-12 14:27 ` Jarod Wilson
2016-09-07 20:35 ` Stephen Hemminger [this message]
2016-09-07 23:44 ` Jarod Wilson
2016-09-12 2:59 ` YOSHIFUJI Hideaki
2016-09-12 14:31 ` Jarod Wilson
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