[TCP]: Do not purge sk_forward_alloc entirely in tcp_delack_timer().

[sfrench/cifs-2.6.git] / net / ipv4 / tcp_timer.c

diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
index e9b151b3a598e46dfd162bdc4645bdb083d48e83..803d758a2b124f0301f9dae7dbbd750722acf5e9 100644 (file)
--- a/net/ipv4/tcp_timer.c
+++ b/net/ipv4/tcp_timer.c
@@ -114,13 +114,31 @@ static int tcp_orphan_retries(struct sock *sk, int alive)
        return retries;
 }
 
+static void tcp_mtu_probing(struct inet_connection_sock *icsk, struct sock *sk)
+{
+       /* Black hole detection */
+       if (sysctl_tcp_mtu_probing) {
+               if (!icsk->icsk_mtup.enabled) {
+                       icsk->icsk_mtup.enabled = 1;
+                       tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
+               } else {
+                       struct tcp_sock *tp = tcp_sk(sk);
+                       int mss;
+
+                       mss = tcp_mtu_to_mss(sk, icsk->icsk_mtup.search_low) >> 1;
+                       mss = min(sysctl_tcp_base_mss, mss);
+                       mss = max(mss, 68 - tp->tcp_header_len);
+                       icsk->icsk_mtup.search_low = tcp_mss_to_mtu(sk, mss);
+                       tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
+               }
+       }
+}
+
 /* A write timeout has occurred. Process the after effects. */
 static int tcp_write_timeout(struct sock *sk)
 {
        struct inet_connection_sock *icsk = inet_csk(sk);
-       struct tcp_sock *tp = tcp_sk(sk);
        int retry_until;
-       int mss;
 
        if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
                if (icsk->icsk_retransmits)
@@ -129,18 +147,7 @@ static int tcp_write_timeout(struct sock *sk)
        } else {
                if (icsk->icsk_retransmits >= sysctl_tcp_retries1) {
                        /* Black hole detection */
-                       if (sysctl_tcp_mtu_probing) {
-                               if (!icsk->icsk_mtup.enabled) {
-                                       icsk->icsk_mtup.enabled = 1;
-                                       tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
-                               } else {
-                                       mss = min(sysctl_tcp_base_mss,
-                                                 tcp_mtu_to_mss(sk, icsk->icsk_mtup.search_low)/2);
-                                       mss = max(mss, 68 - tp->tcp_header_len);
-                                       icsk->icsk_mtup.search_low = tcp_mss_to_mtu(sk, mss);
-                                       tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
-                               }
-                       }
+                       tcp_mtu_probing(icsk, sk);
 
                        dst_negative_advice(&sk->sk_dst_cache);
                }
@@ -179,7 +186,7 @@ static void tcp_delack_timer(unsigned long data)
                goto out_unlock;
        }
 
-       sk_stream_mem_reclaim(sk);
+       sk_mem_reclaim_partial(sk);
 
        if (sk->sk_state == TCP_CLOSE || !(icsk->icsk_ack.pending & ICSK_ACK_TIMER))
                goto out;
@@ -219,7 +226,7 @@ static void tcp_delack_timer(unsigned long data)
 
 out:
        if (tcp_memory_pressure)
-               sk_stream_mem_reclaim(sk);
+               sk_mem_reclaim(sk);
 out_unlock:
        bh_unlock_sock(sk);
        sock_put(sk);
@@ -315,7 +322,7 @@ static void tcp_retransmit_timer(struct sock *sk)
        if (icsk->icsk_retransmits == 0) {
                if (icsk->icsk_ca_state == TCP_CA_Disorder ||
                    icsk->icsk_ca_state == TCP_CA_Recovery) {
-                       if (tp->rx_opt.sack_ok) {
+                       if (tcp_is_sack(tp)) {
                                if (icsk->icsk_ca_state == TCP_CA_Recovery)
                                        NET_INC_STATS_BH(LINUX_MIB_TCPSACKRECOVERYFAIL);
                                else
@@ -413,7 +420,7 @@ static void tcp_write_timer(unsigned long data)
        TCP_CHECK_TIMER(sk);
 
 out:
-       sk_stream_mem_reclaim(sk);
+       sk_mem_reclaim(sk);
 out_unlock:
        bh_unlock_sock(sk);
        sock_put(sk);
@@ -507,7 +514,7 @@ static void tcp_keepalive_timer (unsigned long data)
        }
 
        TCP_CHECK_TIMER(sk);
-       sk_stream_mem_reclaim(sk);
+       sk_mem_reclaim(sk);
 
 resched:
        inet_csk_reset_keepalive_timer (sk, elapsed);