From 39da5814db81e8fe9782ae5ea24c0fdfcf2adc96 Mon Sep 17 00:00:00 2001
From: Mark McLoughlin <markmc@redhat.com>
Date: Wed, 26 Nov 2008 13:58:11 +0000
Subject: [PATCH] virtio_net: large tx MTU support
We don't really have a max tx packet size limit, so allow configuring
the device with up to 64k tx MTU.
Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
---
drivers/net/virtio_net.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index e6b5d6ef9ea8..71ca29cc184d 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -613,6 +613,17 @@ static struct ethtool_ops virtnet_ethtool_ops = {
.set_tso = ethtool_op_set_tso,
};
+#define MIN_MTU 68
+#define MAX_MTU 65535
+
+static int virtnet_change_mtu(struct net_device *dev, int new_mtu)
+{
+ if (new_mtu < MIN_MTU || new_mtu > MAX_MTU)
+ return -EINVAL;
+ dev->mtu = new_mtu;
+ return 0;
+}
+
static int virtnet_probe(struct virtio_device *vdev)
{
int err;
@@ -628,6 +639,7 @@ static int virtnet_probe(struct virtio_device *vdev)
dev->open = virtnet_open;
dev->stop = virtnet_close;
dev->hard_start_xmit = start_xmit;
+ dev->change_mtu = virtnet_change_mtu;
dev->features = NETIF_F_HIGHDMA;
#ifdef CONFIG_NET_POLL_CONTROLLER
dev->poll_controller = virtnet_netpoll;
--
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