commit 1a2449a87bb7606113b1aa1a9d3c3e78ef189a1c
author Chris Leech <christopher.leech@intel.com> Tue May 23 18:05:53 2006 -0700
committer David S. Miller <davem@sunset.davemloft.net> Sat Jun 17 21:25:56 2006 -0700
tree 86e833a8694f201de138697646e7e8469e9c8ef6
parent 9593782585e0cf70babe787a8463d492a68b1744

[I/OAT]: TCP recv offload to I/OAT

Locks down user pages and sets up for DMA in tcp_recvmsg, then calls
dma_async_try_early_copy in tcp_v4_do_rcv

Signed-off-by: Chris Leech <christopher.leech@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/tcp_ipv6.c

diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 301eee7..a50eb30 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1218,8 +1218,16 @@
 	bh_lock_sock(sk);
 	ret = 0;
 	if (!sock_owned_by_user(sk)) {
-		if (!tcp_prequeue(sk, skb))
-			ret = tcp_v6_do_rcv(sk, skb);
+#ifdef CONFIG_NET_DMA
+                struct tcp_sock *tp = tcp_sk(sk);
+                if (tp->ucopy.dma_chan)
+                        ret = tcp_v6_do_rcv(sk, skb);
+                else
+#endif
+		{
+			if (!tcp_prequeue(sk, skb))
+				ret = tcp_v6_do_rcv(sk, skb);
+		}
 	} else
 		sk_add_backlog(sk, skb);
 	bh_unlock_sock(sk);