diff options
| author | Robert Shearman <rshearma@brocade.com> | 2017-01-16 14:16:37 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-01-17 14:38:43 -0500 |
| commit | 27d691056bde4a6feca5e83fd92b787332c46302 (patch) | |
| tree | e398b583d3fb116607b78a79337c2e3be5203cbe /net/mpls/mpls_iptunnel.c | |
| parent | aefb4d4ad83b608cb8e0cab8d3cd8e57d3f91feb (diff) | |
mpls: Packet stats
Having MPLS packet stats is useful for observing network operation and
for diagnosing network problems. In the absence of anything better,
RFC2863 and RFC3813 are used for guidance for which stats to expose
and the semantics of them. In particular rx_noroutes maps to in
unknown protos in RFC2863. The stats are exposed to userspace via
AF_MPLS attributes embedded in the IFLA_STATS_AF_SPEC attribute of
RTM_GETSTATS messages.
All the introduced fields are 64-bit, even error ones, to ensure no
overflow with long uptimes. Per-CPU counters are used to avoid
cache-line contention on the commonly used fields. The other fields
have also been made per-CPU for code to avoid performance problems in
error conditions on the assumption that on some platforms the cost of
atomic operations could be more expensive than sending the packet
(which is what would be done in the success case). If that's not the
case, we could instead not use per-CPU counters for these fields.
Only unicast and non-fragment are exposed at the moment, but other
counters can be exposed in the future either by adding to the end of
struct mpls_link_stats or by additional netlink attributes in the
AF_MPLS IFLA_STATS_AF_SPEC nested attribute.
Signed-off-by: Robert Shearman <rshearma@brocade.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/mpls/mpls_iptunnel.c')
| -rw-r--r-- | net/mpls/mpls_iptunnel.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/net/mpls/mpls_iptunnel.c b/net/mpls/mpls_iptunnel.c index 2f7ccd934416..02531284bc49 100644 --- a/net/mpls/mpls_iptunnel.c +++ b/net/mpls/mpls_iptunnel.c @@ -48,11 +48,15 @@ static int mpls_xmit(struct sk_buff *skb) struct dst_entry *dst = skb_dst(skb); struct rtable *rt = NULL; struct rt6_info *rt6 = NULL; + struct mpls_dev *out_mdev; int err = 0; bool bos; int i; unsigned int ttl; + /* Find the output device */ + out_dev = dst->dev; + /* Obtain the ttl */ if (dst->ops->family == AF_INET) { ttl = ip_hdr(skb)->ttl; @@ -66,8 +70,6 @@ static int mpls_xmit(struct sk_buff *skb) skb_orphan(skb); - /* Find the output device */ - out_dev = dst->dev; if (!mpls_output_possible(out_dev) || !dst->lwtstate || skb_warn_if_lro(skb)) goto drop; @@ -109,6 +111,8 @@ static int mpls_xmit(struct sk_buff *skb) bos = false; } + mpls_stats_inc_outucastpkts(out_dev, skb); + if (rt) err = neigh_xmit(NEIGH_ARP_TABLE, out_dev, &rt->rt_gateway, skb); @@ -122,6 +126,9 @@ static int mpls_xmit(struct sk_buff *skb) return LWTUNNEL_XMIT_DONE; drop: + out_mdev = out_dev ? mpls_dev_get(out_dev) : NULL; + if (out_mdev) + MPLS_INC_STATS(out_mdev, tx_errors); kfree_skb(skb); return -EINVAL; } |