diff options
| author | Eric Dumazet <edumazet@google.com> | 2016-04-29 14:16:47 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-05-02 17:02:25 -0400 |
| commit | c10d9310edf5aa4a676991139d1a43ec7d87e56b (patch) | |
| tree | 8ba2a9ec1a83011976369f96481220cd7945eab6 /net/ipv4/tcp_timer.c | |
| parent | 5e59c83f2335d634946e1a4fe7bc1e921930f132 (diff) | |
| download | linux-c10d9310edf5aa4a676991139d1a43ec7d87e56b.tar.bz2 | |
tcp: do not assume TCP code is non preemptible
We want to to make TCP stack preemptible, as draining prequeue
and backlog queues can take lot of time.
Many SNMP updates were assuming that BH (and preemption) was disabled.
Need to convert some __NET_INC_STATS() calls to NET_INC_STATS()
and some __TCP_INC_STATS() to TCP_INC_STATS()
Before using this_cpu_ptr(net->ipv4.tcp_sk) in tcp_v4_send_reset()
and tcp_v4_send_ack(), we add an explicit preempt disabled section.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_timer.c')
| -rw-r--r-- | net/ipv4/tcp_timer.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c index 35f643d8ffbb..debdd8b33e69 100644 --- a/net/ipv4/tcp_timer.c +++ b/net/ipv4/tcp_timer.c @@ -162,8 +162,8 @@ static int tcp_write_timeout(struct sock *sk) if (tp->syn_fastopen || tp->syn_data) tcp_fastopen_cache_set(sk, 0, NULL, true, 0); if (tp->syn_data && icsk->icsk_retransmits == 1) - __NET_INC_STATS(sock_net(sk), - LINUX_MIB_TCPFASTOPENACTIVEFAIL); + NET_INC_STATS(sock_net(sk), + LINUX_MIB_TCPFASTOPENACTIVEFAIL); } retry_until = icsk->icsk_syn_retries ? : net->ipv4.sysctl_tcp_syn_retries; syn_set = true; @@ -178,8 +178,8 @@ static int tcp_write_timeout(struct sock *sk) tp->bytes_acked <= tp->rx_opt.mss_clamp) { tcp_fastopen_cache_set(sk, 0, NULL, true, 0); if (icsk->icsk_retransmits == net->ipv4.sysctl_tcp_retries1) - __NET_INC_STATS(sock_net(sk), - LINUX_MIB_TCPFASTOPENACTIVEFAIL); + NET_INC_STATS(sock_net(sk), + LINUX_MIB_TCPFASTOPENACTIVEFAIL); } /* Black hole detection */ tcp_mtu_probing(icsk, sk); @@ -209,6 +209,7 @@ static int tcp_write_timeout(struct sock *sk) return 0; } +/* Called with BH disabled */ void tcp_delack_timer_handler(struct sock *sk) { struct tcp_sock *tp = tcp_sk(sk); @@ -493,6 +494,7 @@ out_reset_timer: out:; } +/* Called with BH disabled */ void tcp_write_timer_handler(struct sock *sk) { struct inet_connection_sock *icsk = inet_csk(sk); |