linux-kernel - [PATCH v2 2/4] net_dma: revert 'copied

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Message-ID: <20140109201617.28381.62559.stgit@viggo.jf.intel.com>
Date:	Thu, 09 Jan 2014 12:16:36 -0800
From:	Dan Williams <dan.j.williams@...el.com>
To:	dmaengine@...r.kernel.org
Cc:	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	netdev@...r.kernel.org, Ali Saidi <saidi@...in.umich.edu>,
	James Morris <jmorris@...ei.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	Dave Jones <davej@...hat.com>,
	Patrick McHardy <kaber@...sh.net>, linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/4] net_dma: revert 'copied_early'

Now that tcp_dma_try_early_copy() is gone nothing ever sets
copied_early.

Also reverts "53240c208776 tcp: Fix possible double-ack w/ user dma"
since it is no longer necessary.

Cc: Ali Saidi <saidi@...in.umich.edu>
Cc: James Morris <jmorris@...ei.org>
Cc: Patrick McHardy <kaber@...sh.net>
Cc: Eric Dumazet <edumazet@...gle.com>
Cc: David S. Miller <davem@...emloft.net>
Cc: Alexey Kuznetsov <kuznet@....inr.ac.ru>
Cc: Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
Reported-by: Dave Jones <davej@...hat.com>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
---
New in v2.

 net/ipv4/tcp_input.c |   22 ++++++++--------------
 1 files changed, 8 insertions(+), 14 deletions(-)

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 33ef18e550c5..15911a280485 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -5145,19 +5145,15 @@ void tcp_rcv_established(struct sock *sk, struct sk_buff *skb,
 			}
 		} else {
 			int eaten = 0;
-			int copied_early = 0;
 			bool fragstolen = false;
 
-			if (tp->copied_seq == tp->rcv_nxt &&
-			    len - tcp_header_len <= tp->ucopy.len) {
-				if (tp->ucopy.task == current &&
-				    sock_owned_by_user(sk) && !copied_early) {
-					__set_current_state(TASK_RUNNING);
+			if (tp->ucopy.task == current &&
+			    tp->copied_seq == tp->rcv_nxt &&
+			    len - tcp_header_len <= tp->ucopy.len &&
+			    sock_owned_by_user(sk)) {
+				__set_current_state(TASK_RUNNING);
 
-					if (!tcp_copy_to_iovec(sk, skb, tcp_header_len))
-						eaten = 1;
-				}
-				if (eaten) {
+				if (!tcp_copy_to_iovec(sk, skb, tcp_header_len)) {
 					/* Predicted packet is in window by definition.
 					 * seq == rcv_nxt and rcv_wup <= rcv_nxt.
 					 * Hence, check seq<=rcv_wup reduces to:
@@ -5173,9 +5169,8 @@ void tcp_rcv_established(struct sock *sk, struct sk_buff *skb,
 					__skb_pull(skb, tcp_header_len);
 					tp->rcv_nxt = TCP_SKB_CB(skb)->end_seq;
 					NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPHPHITSTOUSER);
+					eaten = 1;
 				}
-				if (copied_early)
-					tcp_cleanup_rbuf(sk, skb->len);
 			}
 			if (!eaten) {
 				if (tcp_checksum_complete_user(sk, skb))
@@ -5212,8 +5207,7 @@ void tcp_rcv_established(struct sock *sk, struct sk_buff *skb,
 					goto no_ack;
 			}
 
-			if (!copied_early || tp->rcv_nxt != tp->rcv_wup)
-				__tcp_ack_snd_check(sk, 0);
+			__tcp_ack_snd_check(sk, 0);
 no_ack:
 			if (eaten)
 				kfree_skb_partial(skb, fragstolen);

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