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l2tp: fix up inconsistent rx/tx statistics 

Historically L2TP core statistics count the L2TP header in the
per-session and per-tunnel byte counts tracked for transmission and
receipt.

Now that l2tp_xmit_skb updates tx stats, it is necessary for
l2tp_xmit_core to pass out the length of the transmitted packet so that
the statistics can be updated correctly.

Signed-off-by: Tom Parkin <tparkin@katalix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Parkin 2020-09-18 11:23:21 +01:00 committed by David S. Miller
parent a9fd686a71
commit f52e4b27d1
1 changed files with 8 additions and 3 deletions
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11
net/l2tp/l2tp_core.c
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@ -1006,7 +1006,7 @@ static int l2tp_xmit_queue(struct l2tp_tunnel *tunnel, struct sk_buff *skb, stru
return err >= 0 ? NET_XMIT_SUCCESS : NET_XMIT_DROP;
}
static int l2tp_xmit_core(struct l2tp_session *session, struct sk_buff *skb)
static int l2tp_xmit_core(struct l2tp_session *session, struct sk_buff *skb, unsigned int *len)
{
struct l2tp_tunnel *tunnel = session->tunnel;
unsigned int data_len = skb->len;
@ -1054,6 +1054,11 @@ static int l2tp_xmit_core(struct l2tp_session *session, struct sk_buff *skb)
goto out_unlock;
}
/* Report transmitted length before we add encap header, which keeps
* statistics consistent for both UDP and IP encap tx/rx paths.
*/
*len = skb->len;
inet = inet_sk(sk);
switch (tunnel->encap) {
case L2TP_ENCAPTYPE_UDP:
@ -1095,10 +1100,10 @@ out_unlock:
*/
int l2tp_xmit_skb(struct l2tp_session *session, struct sk_buff *skb)
{
unsigned int len = skb->len;
unsigned int len = 0;
int ret;
ret = l2tp_xmit_core(session, skb);
ret = l2tp_xmit_core(session, skb, &len);
if (ret == NET_XMIT_SUCCESS) {
atomic_long_inc(&session->tunnel->stats.tx_packets);
atomic_long_add(len, &session->tunnel->stats.tx_bytes);