net: tcp: move GRO/GSO functions to tcp_offload

Would be good to make things explicit and move those functions to
a new file called tcp_offload.c, thus make this similar to tcpv6_offload.c.
While moving all related functions into tcp_offload.c, we can also
make some of them static, since they are only used there. Also, add
an explicit registration function.

Suggested-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 65 deletions

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index d20ede0c9593..289039b4d8de 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -545,8 +545,7 @@ out:
         sock_put(sk);
 }
 
-static void __tcp_v4_send_check(struct sk_buff *skb,
-                                __be32 saddr, __be32 daddr)
+void __tcp_v4_send_check(struct sk_buff *skb, __be32 saddr, __be32 daddr)
 {
         struct tcphdr *th = tcp_hdr(skb);
 
@@ -571,23 +570,6 @@ void tcp_v4_send_check(struct sock *sk, struct sk_buff *skb)
 }
 EXPORT_SYMBOL(tcp_v4_send_check);
 
-int tcp_v4_gso_send_check(struct sk_buff *skb)
-{
-        const struct iphdr *iph;
-        struct tcphdr *th;
-
-        if (!pskb_may_pull(skb, sizeof(*th)))
-                return -EINVAL;
-
-        iph = ip_hdr(skb);
-        th = tcp_hdr(skb);
-
-        th->check = 0;
-        skb->ip_summed = CHECKSUM_PARTIAL;
-        __tcp_v4_send_check(skb, iph->saddr, iph->daddr);
-        return 0;
-}
-
 /*
  *      This routine will send an RST to the other tcp.
  *
@@ -2795,52 +2777,6 @@ void tcp4_proc_exit(void)
 }
 #endif /* CONFIG_PROC_FS */
 
-struct sk_buff **tcp4_gro_receive(struct sk_buff **head, struct sk_buff *skb)
-{
-        const struct iphdr *iph = skb_gro_network_header(skb);
-        __wsum wsum;
-        __sum16 sum;
-
-        switch (skb->ip_summed) {
-        case CHECKSUM_COMPLETE:
-                if (!tcp_v4_check(skb_gro_len(skb), iph->saddr, iph->daddr,
-                                  skb->csum)) {
-                        skb->ip_summed = CHECKSUM_UNNECESSARY;
-                        break;
-                }
-flush:
-                NAPI_GRO_CB(skb)->flush = 1;
-                return NULL;
-
-        case CHECKSUM_NONE:
-                wsum = csum_tcpudp_nofold(iph->saddr, iph->daddr,
-                                          skb_gro_len(skb), IPPROTO_TCP, 0);
-                sum = csum_fold(skb_checksum(skb,
-                                             skb_gro_offset(skb),
-                                             skb_gro_len(skb),
-                                             wsum));
-                if (sum)
-                        goto flush;
-
-                skb->ip_summed = CHECKSUM_UNNECESSARY;
-                break;
-        }
-
-        return tcp_gro_receive(head, skb);
-}
-
-int tcp4_gro_complete(struct sk_buff *skb)
-{
-        const struct iphdr *iph = ip_hdr(skb);
-        struct tcphdr *th = tcp_hdr(skb);
-
-        th->check = ~tcp_v4_check(skb->len - skb_transport_offset(skb),
-                                  iph->saddr, iph->daddr, 0);
-        skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
-
-        return tcp_gro_complete(skb);
-}
-
 struct proto tcp_prot = {
         .name                   = "TCP",
         .owner                  = THIS_MODULE,