From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Dumazet Subject: [PATCH net-next] net: l2tp_eth: provide tx_dropped counter Date: Fri, 29 Jun 2012 08:15:13 +0200 Message-ID: <1340950513.29822.103.camel@edumazet-glaptop> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Cc: netdev To: David Miller Return-path: Received: from mail-ey0-f174.google.com ([209.85.215.174]:47688 "EHLO mail-ey0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750991Ab2F2GPQ (ORCPT ); Fri, 29 Jun 2012 02:15:16 -0400 Received: by eaak11 with SMTP id k11so1156019eaa.19 for ; Thu, 28 Jun 2012 23:15:15 -0700 (PDT) Sender: netdev-owner@vger.kernel.org List-ID: From: Eric Dumazet Change l2tp_xmit_skb() to return NET_XMIT_DROP in case skb is dropped. Use kfree_skb() instead dev_kfree_skb() for drop_monitor pleasure. Support tx_dropped counter for l2tp_eth Signed-off-by: Eric Dumazet Cc: James Chapman --- net/l2tp/l2tp_core.c | 11 ++++++----- net/l2tp/l2tp_eth.c | 15 ++++++++++----- 2 files changed, 16 insertions(+), 10 deletions(-) diff --git a/net/l2tp/l2tp_core.c b/net/l2tp/l2tp_core.c index 32b2155..393355d 100644 --- a/net/l2tp/l2tp_core.c +++ b/net/l2tp/l2tp_core.c @@ -1128,6 +1128,7 @@ int l2tp_xmit_skb(struct l2tp_session *session, struct sk_buff *skb, int hdr_len int headroom; int uhlen = (tunnel->encap == L2TP_ENCAPTYPE_UDP) ? sizeof(struct udphdr) : 0; int udp_len; + int ret = NET_XMIT_SUCCESS; /* Check that there's enough headroom in the skb to insert IP, * UDP and L2TP headers. If not enough, expand it to @@ -1137,8 +1138,8 @@ int l2tp_xmit_skb(struct l2tp_session *session, struct sk_buff *skb, int hdr_len uhlen + hdr_len; old_headroom = skb_headroom(skb); if (skb_cow_head(skb, headroom)) { - dev_kfree_skb(skb); - goto abort; + kfree_skb(skb); + return NET_XMIT_DROP; } new_headroom = skb_headroom(skb); @@ -1156,7 +1157,8 @@ int l2tp_xmit_skb(struct l2tp_session *session, struct sk_buff *skb, int hdr_len bh_lock_sock(sk); if (sock_owned_by_user(sk)) { - dev_kfree_skb(skb); + kfree_skb(skb); + ret = NET_XMIT_DROP; goto out_unlock; } @@ -1215,8 +1217,7 @@ int l2tp_xmit_skb(struct l2tp_session *session, struct sk_buff *skb, int hdr_len out_unlock: bh_unlock_sock(sk); -abort: - return 0; + return ret; } EXPORT_SYMBOL_GPL(l2tp_xmit_skb); diff --git a/net/l2tp/l2tp_eth.c b/net/l2tp/l2tp_eth.c index 47b259f..f9ee74d 100644 --- a/net/l2tp/l2tp_eth.c +++ b/net/l2tp/l2tp_eth.c @@ -44,6 +44,7 @@ struct l2tp_eth { struct list_head list; atomic_long_t tx_bytes; atomic_long_t tx_packets; + atomic_long_t tx_dropped; atomic_long_t rx_bytes; atomic_long_t rx_packets; atomic_long_t rx_errors; @@ -92,12 +93,15 @@ static int l2tp_eth_dev_xmit(struct sk_buff *skb, struct net_device *dev) { struct l2tp_eth *priv = netdev_priv(dev); struct l2tp_session *session = priv->session; + unsigned int len = skb->len; + int ret = l2tp_xmit_skb(session, skb, session->hdr_len); - atomic_long_add(skb->len, &priv->tx_bytes); - atomic_long_inc(&priv->tx_packets); - - l2tp_xmit_skb(session, skb, session->hdr_len); - + if (likely(ret == NET_XMIT_SUCCESS)) { + atomic_long_add(len, &priv->tx_bytes); + atomic_long_inc(&priv->tx_packets); + } else { + atomic_long_inc(&priv->tx_dropped); + } return NETDEV_TX_OK; } @@ -108,6 +112,7 @@ static struct rtnl_link_stats64 *l2tp_eth_get_stats64(struct net_device *dev, stats->tx_bytes = atomic_long_read(&priv->tx_bytes); stats->tx_packets = atomic_long_read(&priv->tx_packets); + stats->tx_dropped = atomic_long_read(&priv->tx_dropped); stats->rx_bytes = atomic_long_read(&priv->rx_bytes); stats->rx_packets = atomic_long_read(&priv->rx_packets); stats->rx_errors = atomic_long_read(&priv->rx_errors);