From c10d9310edf5aa4a676991139d1a43ec7d87e56b Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Fri, 29 Apr 2016 14:16:47 -0700 Subject: 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 Acked-by: Soheil Hassas Yeganeh Signed-off-by: David S. Miller --- net/ipv4/tcp_cubic.c | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) (limited to 'net/ipv4/tcp_cubic.c') diff --git a/net/ipv4/tcp_cubic.c b/net/ipv4/tcp_cubic.c index 59155af9de5d..0ce946e395e1 100644 --- a/net/ipv4/tcp_cubic.c +++ b/net/ipv4/tcp_cubic.c @@ -402,11 +402,11 @@ static void hystart_update(struct sock *sk, u32 delay) ca->last_ack = now; if ((s32)(now - ca->round_start) > ca->delay_min >> 4) { ca->found |= HYSTART_ACK_TRAIN; - __NET_INC_STATS(sock_net(sk), - LINUX_MIB_TCPHYSTARTTRAINDETECT); - __NET_ADD_STATS(sock_net(sk), - LINUX_MIB_TCPHYSTARTTRAINCWND, - tp->snd_cwnd); + NET_INC_STATS(sock_net(sk), + LINUX_MIB_TCPHYSTARTTRAINDETECT); + NET_ADD_STATS(sock_net(sk), + LINUX_MIB_TCPHYSTARTTRAINCWND, + tp->snd_cwnd); tp->snd_ssthresh = tp->snd_cwnd; } } @@ -423,11 +423,11 @@ static void hystart_update(struct sock *sk, u32 delay) if (ca->curr_rtt > ca->delay_min + HYSTART_DELAY_THRESH(ca->delay_min >> 3)) { ca->found |= HYSTART_DELAY; - __NET_INC_STATS(sock_net(sk), - LINUX_MIB_TCPHYSTARTDELAYDETECT); - __NET_ADD_STATS(sock_net(sk), - LINUX_MIB_TCPHYSTARTDELAYCWND, - tp->snd_cwnd); + NET_INC_STATS(sock_net(sk), + LINUX_MIB_TCPHYSTARTDELAYDETECT); + NET_ADD_STATS(sock_net(sk), + LINUX_MIB_TCPHYSTARTDELAYCWND, + tp->snd_cwnd); tp->snd_ssthresh = tp->snd_cwnd; } } -- cgit v1.2.3-59-g8ed1b