27d691056b
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>
77 lines
2.2 KiB
C
77 lines
2.2 KiB
C
#ifndef _UAPI_MPLS_H
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#define _UAPI_MPLS_H
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#include <linux/types.h>
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#include <asm/byteorder.h>
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/* Reference: RFC 5462, RFC 3032
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*
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* 0 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Label | TC |S| TTL |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* Label: Label Value, 20 bits
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* TC: Traffic Class field, 3 bits
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* S: Bottom of Stack, 1 bit
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* TTL: Time to Live, 8 bits
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*/
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struct mpls_label {
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__be32 entry;
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};
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#define MPLS_LS_LABEL_MASK 0xFFFFF000
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#define MPLS_LS_LABEL_SHIFT 12
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#define MPLS_LS_TC_MASK 0x00000E00
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#define MPLS_LS_TC_SHIFT 9
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#define MPLS_LS_S_MASK 0x00000100
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#define MPLS_LS_S_SHIFT 8
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#define MPLS_LS_TTL_MASK 0x000000FF
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#define MPLS_LS_TTL_SHIFT 0
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/* Reserved labels */
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#define MPLS_LABEL_IPV4NULL 0 /* RFC3032 */
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#define MPLS_LABEL_RTALERT 1 /* RFC3032 */
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#define MPLS_LABEL_IPV6NULL 2 /* RFC3032 */
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#define MPLS_LABEL_IMPLNULL 3 /* RFC3032 */
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#define MPLS_LABEL_ENTROPY 7 /* RFC6790 */
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#define MPLS_LABEL_GAL 13 /* RFC5586 */
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#define MPLS_LABEL_OAMALERT 14 /* RFC3429 */
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#define MPLS_LABEL_EXTENSION 15 /* RFC7274 */
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#define MPLS_LABEL_FIRST_UNRESERVED 16 /* RFC3032 */
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/* These are embedded into IFLA_STATS_AF_SPEC:
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* [IFLA_STATS_AF_SPEC]
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* -> [AF_MPLS]
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* -> [MPLS_STATS_xxx]
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*
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* Attributes:
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* [MPLS_STATS_LINK] = {
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* struct mpls_link_stats
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* }
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*/
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enum {
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MPLS_STATS_UNSPEC, /* also used as 64bit pad attribute */
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MPLS_STATS_LINK,
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__MPLS_STATS_MAX,
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};
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#define MPLS_STATS_MAX (__MPLS_STATS_MAX - 1)
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struct mpls_link_stats {
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__u64 rx_packets; /* total packets received */
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__u64 tx_packets; /* total packets transmitted */
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__u64 rx_bytes; /* total bytes received */
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__u64 tx_bytes; /* total bytes transmitted */
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__u64 rx_errors; /* bad packets received */
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__u64 tx_errors; /* packet transmit problems */
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__u64 rx_dropped; /* packet dropped on receive */
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__u64 tx_dropped; /* packet dropped on transmit */
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__u64 rx_noroute; /* no route for packet dest */
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};
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#endif /* _UAPI_MPLS_H */
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