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-rw-r--r--net/ipv4/proc.c3
-rw-r--r--net/ipv4/tcp_input.c4
2 files changed, 7 insertions, 0 deletions
diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c
index a631a1f110c..731789bb499 100644
--- a/net/ipv4/proc.c
+++ b/net/ipv4/proc.c
@@ -234,6 +234,9 @@ static const struct snmp_mib snmp4_net_list[] = {
SNMP_MIB_ITEM("TCPSpuriousRTOs", LINUX_MIB_TCPSPURIOUSRTOS),
SNMP_MIB_ITEM("TCPMD5NotFound", LINUX_MIB_TCPMD5NOTFOUND),
SNMP_MIB_ITEM("TCPMD5Unexpected", LINUX_MIB_TCPMD5UNEXPECTED),
+ SNMP_MIB_ITEM("TCPSackShifted", LINUX_MIB_SACKSHIFTED),
+ SNMP_MIB_ITEM("TCPSackMerged", LINUX_MIB_SACKMERGED),
+ SNMP_MIB_ITEM("TCPSackShiftFallback", LINUX_MIB_SACKSHIFTFALLBACK),
SNMP_MIB_SENTINEL
};
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index e6291dde334..9f8a80ba17b 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -1415,6 +1415,7 @@ static int tcp_shifted_skb(struct sock *sk, struct sk_buff *prev,
if (skb->len > 0) {
BUG_ON(!tcp_skb_pcount(skb));
+ NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_SACKSHIFTED);
return 0;
}
@@ -1436,6 +1437,8 @@ static int tcp_shifted_skb(struct sock *sk, struct sk_buff *prev,
tcp_unlink_write_queue(skb, sk);
sk_wmem_free_skb(sk, skb);
+ NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_SACKMERGED);
+
return 1;
}
@@ -1594,6 +1597,7 @@ noop:
return skb;
fallback:
+ NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_SACKSHIFTFALLBACK);
return NULL;
}