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authorEric Dumazet <edumazet@google.com>2016-04-30 00:16:47 +0300
committerDavid S. Miller <davem@davemloft.net>2016-05-03 00:02:25 +0300
commitc10d9310edf5aa4a676991139d1a43ec7d87e56b (patch)
tree8ba2a9ec1a83011976369f96481220cd7945eab6 /net/ipv4/tcp_recovery.c
parent5e59c83f2335d634946e1a4fe7bc1e921930f132 (diff)
downloadlinux-c10d9310edf5aa4a676991139d1a43ec7d87e56b.tar.xz
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_recovery.c')
-rw-r--r--net/ipv4/tcp_recovery.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv4/tcp_recovery.c b/net/ipv4/tcp_recovery.c
index e0d0afaf15be..e36df4fcfeba 100644
--- a/net/ipv4/tcp_recovery.c
+++ b/net/ipv4/tcp_recovery.c
@@ -65,8 +65,8 @@ int tcp_rack_mark_lost(struct sock *sk)
if (scb->sacked & TCPCB_SACKED_RETRANS) {
scb->sacked &= ~TCPCB_SACKED_RETRANS;
tp->retrans_out -= tcp_skb_pcount(skb);
- __NET_INC_STATS(sock_net(sk),
- LINUX_MIB_TCPLOSTRETRANSMIT);
+ NET_INC_STATS(sock_net(sk),
+ LINUX_MIB_TCPLOSTRETRANSMIT);
}
} else if (!(scb->sacked & TCPCB_RETRANS)) {
/* Original data are sent sequentially so stop early