linux-kernel - Re: [PATCH] Allow pktgen to work with loopback devices.

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Message-ID: <45F19006.9060607@garzik.org>
Date:	Fri, 09 Mar 2007 11:49:10 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	Josh Triplett <josh@...edesktop.org>
CC:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] Allow pktgen to work with loopback devices.

Josh Triplett wrote:
> pktgen currently only works on network devices with type ARPHRD_ETHER.  Add
> support for the loopback device, type ARPHRD_LOOPBACK.
> 
> I've tested this on my system, using a modified pktgen.conf-1-1 with
> s/eth1/lo/g, and it works fine; the network device statistics confirm packet
> transmission and receipt.
> 
> Thanks to Sarah Bailey for discovering and tracking down the problem.
> 
> Signed-off-by: Josh Triplett <josh@...edesktop.org>
> ---
> 
> I intentionally didn't change the error message "not an ethernet device".  For
> the purposes of pktgen, loopback devices act like ethernet devices.
> 
>  net/core/pktgen.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/net/core/pktgen.c b/net/core/pktgen.c
> index 74a9a32..6fc6f9d 100644
> --- a/net/core/pktgen.c
> +++ b/net/core/pktgen.c
> @@ -1930,7 +1930,7 @@ static struct net_device *pktgen_setup_dev(struct pktgen_dev *pkt_dev)
>  		printk("pktgen: no such netdevice: \"%s\"\n", pkt_dev->ifname);
>  		goto out;
>  	}
> -	if (odev->type != ARPHRD_ETHER) {
> +	if (odev->type != ARPHRD_LOOPBACK && odev->type != ARPHRD_ETHER) {
>  		printk("pktgen: not an ethernet device: \"%s\"\n",
>  		       pkt_dev->ifname);

I'll let DaveM queue this (or not)


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