v4.19.13 snapshot.
diff --git a/net/mpls/mpls_gso.c b/net/mpls/mpls_gso.c
new file mode 100644
index 0000000..b4da6d8
--- /dev/null
+++ b/net/mpls/mpls_gso.c
@@ -0,0 +1,110 @@
+/*
+ * MPLS GSO Support
+ *
+ * Authors: Simon Horman (horms@verge.net.au)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * Based on: GSO portions of net/ipv4/gre.c
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/netdev_features.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+
+static struct sk_buff *mpls_gso_segment(struct sk_buff *skb,
+ netdev_features_t features)
+{
+ struct sk_buff *segs = ERR_PTR(-EINVAL);
+ u16 mac_offset = skb->mac_header;
+ netdev_features_t mpls_features;
+ u16 mac_len = skb->mac_len;
+ __be16 mpls_protocol;
+ unsigned int mpls_hlen;
+
+ skb_reset_network_header(skb);
+ mpls_hlen = skb_inner_network_header(skb) - skb_network_header(skb);
+ if (unlikely(!pskb_may_pull(skb, mpls_hlen)))
+ goto out;
+
+ /* Setup inner SKB. */
+ mpls_protocol = skb->protocol;
+ skb->protocol = skb->inner_protocol;
+
+ __skb_pull(skb, mpls_hlen);
+
+ skb->mac_len = 0;
+ skb_reset_mac_header(skb);
+
+ /* Segment inner packet. */
+ mpls_features = skb->dev->mpls_features & features;
+ segs = skb_mac_gso_segment(skb, mpls_features);
+ if (IS_ERR_OR_NULL(segs)) {
+ skb_gso_error_unwind(skb, mpls_protocol, mpls_hlen, mac_offset,
+ mac_len);
+ goto out;
+ }
+ skb = segs;
+
+ mpls_hlen += mac_len;
+ do {
+ skb->mac_len = mac_len;
+ skb->protocol = mpls_protocol;
+
+ skb_reset_inner_network_header(skb);
+
+ __skb_push(skb, mpls_hlen);
+
+ skb_reset_mac_header(skb);
+ skb_set_network_header(skb, mac_len);
+ } while ((skb = skb->next));
+
+out:
+ return segs;
+}
+
+static struct packet_offload mpls_mc_offload __read_mostly = {
+ .type = cpu_to_be16(ETH_P_MPLS_MC),
+ .priority = 15,
+ .callbacks = {
+ .gso_segment = mpls_gso_segment,
+ },
+};
+
+static struct packet_offload mpls_uc_offload __read_mostly = {
+ .type = cpu_to_be16(ETH_P_MPLS_UC),
+ .priority = 15,
+ .callbacks = {
+ .gso_segment = mpls_gso_segment,
+ },
+};
+
+static int __init mpls_gso_init(void)
+{
+ pr_info("MPLS GSO support\n");
+
+ dev_add_offload(&mpls_uc_offload);
+ dev_add_offload(&mpls_mc_offload);
+
+ return 0;
+}
+
+static void __exit mpls_gso_exit(void)
+{
+ dev_remove_offload(&mpls_uc_offload);
+ dev_remove_offload(&mpls_mc_offload);
+}
+
+module_init(mpls_gso_init);
+module_exit(mpls_gso_exit);
+
+MODULE_DESCRIPTION("MPLS GSO support");
+MODULE_AUTHOR("Simon Horman (horms@verge.net.au)");
+MODULE_LICENSE("GPL");