X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=net%2Fipv4%2Ftcp.c;fp=net%2Fipv4%2Ftcp.c;h=e369c0b9dcecabd338bf9bcfe5f0e638111dfee9;hb=4e76c8a9fa413ccc09d3f7f664183dcce3555d57;hp=6a228319f1a404bdbd678ff360dba31464e2d0cf;hpb=1db395853d4f30d6120458bd279ede1f882a8525;p=linux-2.6.git

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 6a228319f..e369c0b9d 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -258,6 +258,7 @@
 #include <linux/random.h>
 #include <linux/bootmem.h>
 #include <linux/cache.h>
+#include <linux/err.h>
 #include <linux/in.h>
 
 #include <net/icmp.h>
@@ -572,7 +573,7 @@ new_segment:
 		skb->ip_summed = CHECKSUM_HW;
 		tp->write_seq += copy;
 		TCP_SKB_CB(skb)->end_seq += copy;
-		skb_shinfo(skb)->tso_segs = 0;
+		skb_shinfo(skb)->gso_segs = 0;
 
 		if (!copied)
 			TCP_SKB_CB(skb)->flags &= ~TCPCB_FLAG_PSH;
@@ -623,14 +624,10 @@ ssize_t tcp_sendpage(struct socket *sock, struct page *page, int offset,
 	ssize_t res;
 	struct sock *sk = sock->sk;
 
-#define TCP_ZC_CSUM_FLAGS (NETIF_F_IP_CSUM | NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)
-
 	if (!(sk->sk_route_caps & NETIF_F_SG) ||
-	    !(sk->sk_route_caps & TCP_ZC_CSUM_FLAGS))
+	    !(sk->sk_route_caps & NETIF_F_ALL_CSUM))
 		return sock_no_sendpage(sock, page, offset, size, flags);
 
-#undef TCP_ZC_CSUM_FLAGS
-
 	lock_sock(sk);
 	TCP_CHECK_TIMER(sk);
 	res = do_tcp_sendpages(sk, &page, offset, size, flags);
@@ -727,9 +724,7 @@ new_segment:
 				/*
 				 * Check whether we can use HW checksum.
 				 */
-				if (sk->sk_route_caps &
-				    (NETIF_F_IP_CSUM | NETIF_F_NO_CSUM |
-				     NETIF_F_HW_CSUM))
+				if (sk->sk_route_caps & NETIF_F_ALL_CSUM)
 					skb->ip_summed = CHECKSUM_HW;
 
 				skb_entail(sk, tp, skb);
@@ -825,7 +820,7 @@ new_segment:
 
 			tp->write_seq += copy;
 			TCP_SKB_CB(skb)->end_seq += copy;
-			skb_shinfo(skb)->tso_segs = 0;
+			skb_shinfo(skb)->gso_segs = 0;
 
 			from += copy;
 			copied += copy;
@@ -2072,6 +2067,77 @@ int compat_tcp_getsockopt(struct sock *sk, int level, int optname,
 EXPORT_SYMBOL(compat_tcp_getsockopt);
 #endif
 
+struct sk_buff *tcp_tso_segment(struct sk_buff *skb, int features)
+{
+	struct sk_buff *segs = ERR_PTR(-EINVAL);
+	struct tcphdr *th;
+	unsigned thlen;
+	unsigned int seq;
+	unsigned int delta;
+	unsigned int oldlen;
+	unsigned int len;
+
+	if (!pskb_may_pull(skb, sizeof(*th)))
+		goto out;
+
+	th = skb->h.th;
+	thlen = th->doff * 4;
+	if (thlen < sizeof(*th))
+		goto out;
+
+	if (!pskb_may_pull(skb, thlen))
+		goto out;
+
+	oldlen = (u16)~skb->len;
+	__skb_pull(skb, thlen);
+
+	if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
+		/* Packet is from an untrusted source, reset gso_segs. */
+		int mss = skb_shinfo(skb)->gso_size;
+
+		skb_shinfo(skb)->gso_segs = (skb->len + mss - 1) / mss;
+
+		segs = NULL;
+		goto out;
+	}
+
+	segs = skb_segment(skb, features);
+	if (IS_ERR(segs))
+		goto out;
+
+	len = skb_shinfo(skb)->gso_size;
+	delta = htonl(oldlen + (thlen + len));
+
+	skb = segs;
+	th = skb->h.th;
+	seq = ntohl(th->seq);
+
+	do {
+		th->fin = th->psh = 0;
+
+		th->check = ~csum_fold(th->check + delta);
+		if (skb->ip_summed != CHECKSUM_HW)
+			th->check = csum_fold(csum_partial(skb->h.raw, thlen,
+							   skb->csum));
+
+		seq += len;
+		skb = skb->next;
+		th = skb->h.th;
+
+		th->seq = htonl(seq);
+		th->cwr = 0;
+	} while (skb->next);
+
+	delta = htonl(oldlen + (skb->tail - skb->h.raw) + skb->data_len);
+	th->check = ~csum_fold(th->check + delta);
+	if (skb->ip_summed != CHECKSUM_HW)
+		th->check = csum_fold(csum_partial(skb->h.raw, thlen,
+						   skb->csum));
+
+out:
+	return segs;
+}
+
 extern void __skb_cb_too_small_for_tcp(int, int);
 extern struct tcp_congestion_ops tcp_reno;