[PATCH] Allow pktgen to work with loopback devices.

[Josh Triplett <josh@freedesktop.org>]

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@freedesktop.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);
 		goto out_put;
-- 
1.5.0.2