This is my interpretation of a
missing piece of "Alternate approach to MPLS"
Signed-off-by: Simon Horman <ho...@verge.net.au>
---
lib/flow.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
diff --git a/lib/flow.c b/lib/flow.c
index 320cb55..295963e 100644
--- a/lib/flow.c
+++ b/lib/flow.c
@@ -1046,6 +1046,32 @@ flow_set_vlan_pcp(struct flow *flow, uint8_t pcp)
flow->vlan_tci |= htons((pcp << VLAN_PCP_SHIFT) | VLAN_CFI);
}
+/* Returns the number of MPLS LSEs present in 'flow'
+ *
+ * Returns 0 if the 'dl_type' of 'flow' is not an MPLS ethernet type.
+ * Otherwise traverses 'flow''s MPLS label stack stopping at the
+ * first entry that has the BoS bit set. If no such entry exists then
+ * the maximum number of LSEs that can be stored in 'flow' is returned.
+ */
+int
+flow_count_mpls_labels(const struct flow *flow)
+{
+ if (eth_type_mpls(flow->dl_type)) {
+ int i;
+ int len = ARRAY_SIZE(flow->mpls_lse);
+
+ for (i = 0; i < len; i++) {
+ if (flow->mpls_lse[i] & htonl(MPLS_BOS_MASK)) {
+ return i + 1;
+ }
+ }
+
+ return len;
+ } else {
+ return 0;
+ }
+}
+
void
flow_push_mpls(struct flow *flow, ovs_be32 mpls_eth_type,
struct flow_wildcards *wc)
--
1.8.4
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