Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / ipv6 / tcpv6_offload.c

diff --git a/kernel/net/ipv6/tcpv6_offload.c b/kernel/net/ipv6/tcpv6_offload.c
new file mode 100644 (file)
index 0000000..d883c92
--- /dev/null
+++ b/kernel/net/ipv6/tcpv6_offload.c
@@ -0,0 +1,78 @@
+/*
+ *     IPV6 GSO/GRO offload support
+ *     Linux INET6 implementation
+ *
+ *     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.
+ *
+ *      TCPv6 GSO/GRO support
+ */
+#include <linux/skbuff.h>
+#include <net/protocol.h>
+#include <net/tcp.h>
+#include <net/ip6_checksum.h>
+#include "ip6_offload.h"
+
+static struct sk_buff **tcp6_gro_receive(struct sk_buff **head,
+                                        struct sk_buff *skb)
+{
+       /* Don't bother verifying checksum if we're going to flush anyway. */
+       if (!NAPI_GRO_CB(skb)->flush &&
+           skb_gro_checksum_validate(skb, IPPROTO_TCP,
+                                     ip6_gro_compute_pseudo)) {
+               NAPI_GRO_CB(skb)->flush = 1;
+               return NULL;
+       }
+
+       return tcp_gro_receive(head, skb);
+}
+
+static int tcp6_gro_complete(struct sk_buff *skb, int thoff)
+{
+       const struct ipv6hdr *iph = ipv6_hdr(skb);
+       struct tcphdr *th = tcp_hdr(skb);
+
+       th->check = ~tcp_v6_check(skb->len - thoff, &iph->saddr,
+                                 &iph->daddr, 0);
+       skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV6;
+
+       return tcp_gro_complete(skb);
+}
+
+static struct sk_buff *tcp6_gso_segment(struct sk_buff *skb,
+                                       netdev_features_t features)
+{
+       struct tcphdr *th;
+
+       if (!pskb_may_pull(skb, sizeof(*th)))
+               return ERR_PTR(-EINVAL);
+
+       if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
+               const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
+               struct tcphdr *th = tcp_hdr(skb);
+
+               /* Set up pseudo header, usually expect stack to have done
+                * this.
+                */
+
+               th->check = 0;
+               skb->ip_summed = CHECKSUM_PARTIAL;
+               __tcp_v6_send_check(skb, &ipv6h->saddr, &ipv6h->daddr);
+       }
+
+       return tcp_gso_segment(skb, features);
+}
+static const struct net_offload tcpv6_offload = {
+       .callbacks = {
+               .gso_segment    =       tcp6_gso_segment,
+               .gro_receive    =       tcp6_gro_receive,
+               .gro_complete   =       tcp6_gro_complete,
+       },
+};
+
+int __init tcpv6_offload_init(void)
+{
+       return inet6_add_offload(&tcpv6_offload, IPPROTO_TCP);
+}