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| 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_cubic.c | |
| parent | 5e59c83f2335d634946e1a4fe7bc1e921930f132 (diff) | |
| download | linux-c10d9310edf5aa4a676991139d1a43ec7d87e56b.tar.gz linux-c10d9310edf5aa4a676991139d1a43ec7d87e56b.tar.bz2 linux-c10d9310edf5aa4a676991139d1a43ec7d87e56b.zip | |
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_cubic.c')
| -rw-r--r-- | net/ipv4/tcp_cubic.c | 20 |
1 files changed, 10 insertions, 10 deletions
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; } } |