@@ -216,6 +216,9 @@ enum
LINUX_MIB_TCPSPURIOUSRTOS, /* TCPSpuriousRTOs */
LINUX_MIB_TCPMD5NOTFOUND, /* TCPMD5NotFound */
LINUX_MIB_TCPMD5UNEXPECTED, /* TCPMD5Unexpected */
+ LINUX_MIB_SACKSHIFTED,
+ LINUX_MIB_SACKMERGED,
+ LINUX_MIB_SACKSHIFTFALLBACK,
__LINUX_MIB_MAX
};
@@ -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
};
@@ -1414,6 +1414,7 @@ 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;
}
@@ -1435,6 +1436,8 @@ 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;
}
@@ -1593,6 +1596,7 @@ noop:
return skb;
fallback:
+ NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_SACKSHIFTFALLBACK);
return NULL;
}
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi> --- include/linux/snmp.h | 3 +++ net/ipv4/proc.c | 3 +++ net/ipv4/tcp_input.c | 4 ++++ 3 files changed, 10 insertions(+), 0 deletions(-)