Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next

Pull networking updates from David Miller:

 1) Support ipv6 checksum offload in sunvnet driver, from Shannon
    Nelson.

 2) Move to RB-tree instead of custom AVL code in inetpeer, from Eric
    Dumazet.

 3) Allow generic XDP to work on virtual devices, from John Fastabend.

 4) Add bpf device maps and XDP_REDIRECT, which can be used to build
    arbitrary switching frameworks using XDP. From John Fastabend.

 5) Remove UFO offloads from the tree, gave us little other than bugs.

 6) Remove the IPSEC flow cache, from Florian Westphal.

 7) Support ipv6 route offload in mlxsw driver.

 8) Support VF representors in bnxt_en, from Sathya Perla.

 9) Add support for forward error correction modes to ethtool, from
    Vidya Sagar Ravipati.

10) Add time filter for packet scheduler action dumping, from Jamal Hadi
    Salim.

11) Extend the zerocopy sendmsg() used by virtio and tap to regular
    sockets via MSG_ZEROCOPY. From Willem de Bruijn.

12) Significantly rework value tracking in the BPF verifier, from Edward
    Cree.

13) Add new jump instructions to eBPF, from Daniel Borkmann.

14) Rework rtnetlink plumbing so that operations can be run without
    taking the RTNL semaphore. From Florian Westphal.

15) Support XDP in tap driver, from Jason Wang.

16) Add 32-bit eBPF JIT for ARM, from Shubham Bansal.

17) Add Huawei hinic ethernet driver.

18) Allow to report MD5 keys in TCP inet_diag dumps, from Ivan
    Delalande.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1780 commits)
  i40e: point wb_desc at the nvm_wb_desc during i40e_read_nvm_aq
  i40e: avoid NVM acquire deadlock during NVM update
  drivers: net: xgene: Remove return statement from void function
  drivers: net: xgene: Configure tx/rx delay for ACPI
  drivers: net: xgene: Read tx/rx delay for ACPI
  rocker: fix kcalloc parameter order
  rds: Fix non-atomic operation on shared flag variable
  net: sched: don't use GFP_KERNEL under spin lock
  vhost_net: correctly check tx avail during rx busy polling
  net: mdio-mux: add mdio_mux parameter to mdio_mux_init()
  rxrpc: Make service connection lookup always check for retry
  net: stmmac: Delete dead code for MDIO registration
  gianfar: Fix Tx flow control deactivation
  cxgb4: Ignore MPS_TX_INT_CAUSE[Bubble] for T6
  cxgb4: Fix pause frame count in t4_get_port_stats
  cxgb4: fix memory leak
  tun: rename generic_xdp to skb_xdp
  tun: reserve extra headroom only when XDP is set
  net: dsa: bcm_sf2: Configure IMP port TC2QOS mapping
  net: dsa: bcm_sf2: Advertise number of egress queues
  ...

1 files changed, 3 insertions, 97 deletions

diff --git a/net/ipv6/udp_offload.c b/net/ipv6/udp_offload.c
index e7d378c..455fd4e 100644
--- a/net/ipv6/udp_offload.c
+++ b/net/ipv6/udp_offload.c
@@ -17,109 +17,15 @@
 #include <net/ip6_checksum.h>
 #include "ip6_offload.h"
 
-static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb,
-					 netdev_features_t features)
+static struct sk_buff *udp6_tunnel_segment(struct sk_buff *skb,
+					   netdev_features_t features)
 {
 	struct sk_buff *segs = ERR_PTR(-EINVAL);
-	unsigned int mss;
-	unsigned int unfrag_ip6hlen, unfrag_len;
-	struct frag_hdr *fptr;
-	u8 *packet_start, *prevhdr;
-	u8 nexthdr;
-	u8 frag_hdr_sz = sizeof(struct frag_hdr);
-	__wsum csum;
-	int tnl_hlen;
-	int err;
-
-	mss = skb_shinfo(skb)->gso_size;
-	if (unlikely(skb->len <= mss))
-		goto out;
-
-	if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
-		/* Packet is from an untrusted source, reset gso_segs. */
-
-		skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss);
-
-		/* Set the IPv6 fragment id if not set yet */
-		if (!skb_shinfo(skb)->ip6_frag_id)
-			ipv6_proxy_select_ident(dev_net(skb->dev), skb);
-
-		segs = NULL;
-		goto out;
-	}
 
 	if (skb->encapsulation && skb_shinfo(skb)->gso_type &
 	    (SKB_GSO_UDP_TUNNEL|SKB_GSO_UDP_TUNNEL_CSUM))
 		segs = skb_udp_tunnel_segment(skb, features, true);
-	else {
-		const struct ipv6hdr *ipv6h;
-		struct udphdr *uh;
-
-		if (!pskb_may_pull(skb, sizeof(struct udphdr)))
-			goto out;
-
-		/* Do software UFO. Complete and fill in the UDP checksum as HW cannot
-		 * do checksum of UDP packets sent as multiple IP fragments.
-		 */
-
-		uh = udp_hdr(skb);
-		ipv6h = ipv6_hdr(skb);
-
-		uh->check = 0;
-		csum = skb_checksum(skb, 0, skb->len, 0);
-		uh->check = udp_v6_check(skb->len, &ipv6h->saddr,
-					  &ipv6h->daddr, csum);
-		if (uh->check == 0)
-			uh->check = CSUM_MANGLED_0;
-
-		skb->ip_summed = CHECKSUM_UNNECESSARY;
-
-		/* If there is no outer header we can fake a checksum offload
-		 * due to the fact that we have already done the checksum in
-		 * software prior to segmenting the frame.
-		 */
-		if (!skb->encap_hdr_csum)
-			features |= NETIF_F_HW_CSUM;
-
-		/* Check if there is enough headroom to insert fragment header. */
-		tnl_hlen = skb_tnl_header_len(skb);
-		if (skb->mac_header < (tnl_hlen + frag_hdr_sz)) {
-			if (gso_pskb_expand_head(skb, tnl_hlen + frag_hdr_sz))
-				goto out;
-		}
-
-		/* Find the unfragmentable header and shift it left by frag_hdr_sz
-		 * bytes to insert fragment header.
-		 */
-		err = ip6_find_1stfragopt(skb, &prevhdr);
-		if (err < 0)
-			return ERR_PTR(err);
-		unfrag_ip6hlen = err;
-		nexthdr = *prevhdr;
-		*prevhdr = NEXTHDR_FRAGMENT;
-		unfrag_len = (skb_network_header(skb) - skb_mac_header(skb)) +
-			     unfrag_ip6hlen + tnl_hlen;
-		packet_start = (u8 *) skb->head + SKB_GSO_CB(skb)->mac_offset;
-		memmove(packet_start-frag_hdr_sz, packet_start, unfrag_len);
-
-		SKB_GSO_CB(skb)->mac_offset -= frag_hdr_sz;
-		skb->mac_header -= frag_hdr_sz;
-		skb->network_header -= frag_hdr_sz;
-
-		fptr = (struct frag_hdr *)(skb_network_header(skb) + unfrag_ip6hlen);
-		fptr->nexthdr = nexthdr;
-		fptr->reserved = 0;
-		if (!skb_shinfo(skb)->ip6_frag_id)
-			ipv6_proxy_select_ident(dev_net(skb->dev), skb);
-		fptr->identification = skb_shinfo(skb)->ip6_frag_id;
-
-		/* Fragment the skb. ipv6 header and the remaining fields of the
-		 * fragment header are updated in ipv6_gso_segment()
-		 */
-		segs = skb_segment(skb, features);
-	}
 
-out:
 	return segs;
 }
 
@@ -169,7 +75,7 @@ static int udp6_gro_complete(struct sk_buff *skb, int nhoff)
 
 static const struct net_offload udpv6_offload = {
 	.callbacks = {
-		.gso_segment	=	udp6_ufo_fragment,
+		.gso_segment	=	udp6_tunnel_segment,
 		.gro_receive	=	udp6_gro_receive,
 		.gro_complete	=	udp6_gro_complete,
 	},