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-rw-r--r--drivers/net/ethernet/sun/sunvnet.c37
1 files changed, 36 insertions, 1 deletions
diff --git a/drivers/net/ethernet/sun/sunvnet.c b/drivers/net/ethernet/sun/sunvnet.c
index 39804715bf22..126269762ee7 100644
--- a/drivers/net/ethernet/sun/sunvnet.c
+++ b/drivers/net/ethernet/sun/sunvnet.c
@@ -17,6 +17,13 @@
#include <linux/mutex.h>
#include <linux/if_vlan.h>
+#if IS_ENABLED(CONFIG_IPV6)
+#include <linux/icmpv6.h>
+#endif
+
+#include <net/icmp.h>
+#include <net/route.h>
+
#include <asm/vio.h>
#include <asm/ldc.h>
@@ -913,8 +920,36 @@ static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
if (unlikely(!skb))
goto out_dropped;
- if (skb->len > port->rmtu)
+ if (skb->len > port->rmtu) {
+ unsigned long localmtu = port->rmtu - ETH_HLEN;
+
+ if (vio_version_after_eq(&port->vio, 1, 3))
+ localmtu -= VLAN_HLEN;
+
+ if (skb->protocol == htons(ETH_P_IP)) {
+ struct flowi4 fl4;
+ struct rtable *rt = NULL;
+
+ memset(&fl4, 0, sizeof(fl4));
+ fl4.flowi4_oif = dev->ifindex;
+ fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos);
+ fl4.daddr = ip_hdr(skb)->daddr;
+ fl4.saddr = ip_hdr(skb)->saddr;
+
+ rt = ip_route_output_key(dev_net(dev), &fl4);
+ if (!IS_ERR(rt)) {
+ skb_dst_set(skb, &rt->dst);
+ icmp_send(skb, ICMP_DEST_UNREACH,
+ ICMP_FRAG_NEEDED,
+ htonl(localmtu));
+ }
+ }
+#if IS_ENABLED(CONFIG_IPV6)
+ else if (skb->protocol == htons(ETH_P_IPV6))
+ icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, localmtu);
+#endif
goto out_dropped;
+ }
spin_lock_irqsave(&port->vio.lock, flags);