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path: root/drivers/net/gtp.c
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Diffstat (limited to 'drivers/net/gtp.c')
-rw-r--r--drivers/net/gtp.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c
index 4c04e271f184..5a048f050a9c 100644
--- a/drivers/net/gtp.c
+++ b/drivers/net/gtp.c
@@ -612,11 +612,16 @@ static const struct net_device_ops gtp_netdev_ops = {
static void gtp_link_setup(struct net_device *dev)
{
+ unsigned int max_gtp_header_len = sizeof(struct iphdr) +
+ sizeof(struct udphdr) +
+ sizeof(struct gtp0_header);
+
dev->netdev_ops = &gtp_netdev_ops;
dev->needs_free_netdev = true;
dev->hard_header_len = 0;
dev->addr_len = 0;
+ dev->mtu = ETH_DATA_LEN - max_gtp_header_len;
/* Zero header length. */
dev->type = ARPHRD_NONE;
@@ -626,11 +631,7 @@ static void gtp_link_setup(struct net_device *dev)
dev->features |= NETIF_F_LLTX;
netif_keep_dst(dev);
- /* Assume largest header, ie. GTPv0. */
- dev->needed_headroom = LL_MAX_HEADER +
- sizeof(struct iphdr) +
- sizeof(struct udphdr) +
- sizeof(struct gtp0_header);
+ dev->needed_headroom = LL_MAX_HEADER + max_gtp_header_len;
}
static int gtp_hashtable_new(struct gtp_dev *gtp, int hsize);