tcp: use correct counters in CA_CWR state too
As CWR is stronger than CA_Disorder state, we can miscount
SACK/Reno failure into other timeouts. Not a bad problem as
it can happen only due to ECN, FRTO detecting spurious RTO
or xmit error which are the only callers of tcp_enter_cwr.
And even then losses and RTO must still follow thereafter
to actually end up into the relevant code paths.
Compile tested.
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
index f3c8c6c..74a6aa0 100644
--- a/net/ipv4/tcp_timer.c
+++ b/net/ipv4/tcp_timer.c
@@ -367,18 +367,19 @@
if (icsk->icsk_retransmits == 0) {
int mib_idx;
- if (icsk->icsk_ca_state == TCP_CA_Disorder) {
- if (tcp_is_sack(tp))
- mib_idx = LINUX_MIB_TCPSACKFAILURES;
- else
- mib_idx = LINUX_MIB_TCPRENOFAILURES;
- } else if (icsk->icsk_ca_state == TCP_CA_Recovery) {
+ if (icsk->icsk_ca_state == TCP_CA_Recovery) {
if (tcp_is_sack(tp))
mib_idx = LINUX_MIB_TCPSACKRECOVERYFAIL;
else
mib_idx = LINUX_MIB_TCPRENORECOVERYFAIL;
} else if (icsk->icsk_ca_state == TCP_CA_Loss) {
mib_idx = LINUX_MIB_TCPLOSSFAILURES;
+ } else if ((icsk->icsk_ca_state == TCP_CA_Disorder) ||
+ tp->sacked_out) {
+ if (tcp_is_sack(tp))
+ mib_idx = LINUX_MIB_TCPSACKFAILURES;
+ else
+ mib_idx = LINUX_MIB_TCPRENOFAILURES;
} else {
mib_idx = LINUX_MIB_TCPTIMEOUTS;
}