tcp6: Add GRO support

This patch adds GRO support for TCP over IPv6.  The code is exactly
the same as the IPv4 version except for the pseudo-header checksum
computation.

Note that I've removed the unused tcphdr argument from tcp_v6_check
rather than invent a bogus value for GRO.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 35bcddf..bd6ff90 100644 (file)
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2542,6 +2542,7 @@ out:
 
        return pp;
 }
+EXPORT_SYMBOL(tcp_gro_receive);
 
 int tcp_gro_complete(struct sk_buff *skb)
 {
@@ -2558,6 +2559,7 @@ int tcp_gro_complete(struct sk_buff *skb)
 
        return 0;
 }
+EXPORT_SYMBOL(tcp_gro_complete);
 
 #ifdef CONFIG_TCP_MD5SIG
 static unsigned long tcp_md5sig_users;

diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index e8b8337..1297306 100644 (file)
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -101,7 +101,7 @@ static void tcp_v6_hash(struct sock *sk)
        }
 }
 
-static __inline__ __sum16 tcp_v6_check(struct tcphdr *th, int len,
+static __inline__ __sum16 tcp_v6_check(int len,
                                   struct in6_addr *saddr,
                                   struct in6_addr *daddr,
                                   __wsum base)
@@ -501,7 +501,7 @@ static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req)
        if (skb) {
                struct tcphdr *th = tcp_hdr(skb);
 
-               th->check = tcp_v6_check(th, skb->len,
+               th->check = tcp_v6_check(skb->len,
                                         &treq->loc_addr, &treq->rmt_addr,
                                         csum_partial(th, skb->len, skb->csum));
 
@@ -942,6 +942,41 @@ static int tcp_v6_gso_send_check(struct sk_buff *skb)
        return 0;
 }
 
+struct sk_buff **tcp6_gro_receive(struct sk_buff **head, struct sk_buff *skb)
+{
+       struct ipv6hdr *iph = ipv6_hdr(skb);
+
+       switch (skb->ip_summed) {
+       case CHECKSUM_COMPLETE:
+               if (!tcp_v6_check(skb->len, &iph->saddr, &iph->daddr,
+                                 skb->csum)) {
+                       skb->ip_summed = CHECKSUM_UNNECESSARY;
+                       break;
+               }
+
+               /* fall through */
+       case CHECKSUM_NONE:
+               NAPI_GRO_CB(skb)->flush = 1;
+               return NULL;
+       }
+
+       return tcp_gro_receive(head, skb);
+}
+EXPORT_SYMBOL(tcp6_gro_receive);
+
+int tcp6_gro_complete(struct sk_buff *skb)
+{
+       struct ipv6hdr *iph = ipv6_hdr(skb);
+       struct tcphdr *th = tcp_hdr(skb);
+
+       th->check = ~tcp_v6_check(skb->len - skb_transport_offset(skb),
+                                 &iph->saddr, &iph->daddr, 0);
+       skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6;
+
+       return tcp_gro_complete(skb);
+}
+EXPORT_SYMBOL(tcp6_gro_complete);
+
 static void tcp_v6_send_response(struct sk_buff *skb, u32 seq, u32 ack, u32 win,
                                 u32 ts, struct tcp_md5sig_key *key, int rst)
 {
@@ -1429,14 +1464,14 @@ out:
 static __sum16 tcp_v6_checksum_init(struct sk_buff *skb)
 {
        if (skb->ip_summed == CHECKSUM_COMPLETE) {
-               if (!tcp_v6_check(tcp_hdr(skb), skb->len, &ipv6_hdr(skb)->saddr,
+               if (!tcp_v6_check(skb->len, &ipv6_hdr(skb)->saddr,
                                  &ipv6_hdr(skb)->daddr, skb->csum)) {
                        skb->ip_summed = CHECKSUM_UNNECESSARY;
                        return 0;
                }
        }
 
-       skb->csum = ~csum_unfold(tcp_v6_check(tcp_hdr(skb), skb->len,
+       skb->csum = ~csum_unfold(tcp_v6_check(skb->len,
                                              &ipv6_hdr(skb)->saddr,
                                              &ipv6_hdr(skb)->daddr, 0));
 
@@ -2062,6 +2097,8 @@ static struct inet6_protocol tcpv6_protocol = {
        .err_handler    =       tcp_v6_err,
        .gso_send_check =       tcp_v6_gso_send_check,
        .gso_segment    =       tcp_tso_segment,
+       .gro_receive    =       tcp6_gro_receive,
+       .gro_complete   =       tcp6_gro_complete,
        .flags          =       INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
 };