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@engin.umich.edu>
Cc: James Morris <jmorris@namei.org>
Cc: Patrick McHardy <kaber@trash.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Cc: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
Cc: Neal Cardwell <ncardwell@google.com>
Reported-by: Dave Jones <davej@redhat.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 8 insertions, 14 deletions

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 1342e9851f97..1da0ade98236 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -5148,19 +5148,15 @@ 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:
@@ -5176,9 +5172,8 @@ 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))
@@ -5215,8 +5210,7 @@ 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);