openvswitch: Add basic MPLS support to kernel

Allow datapath to recognize and extract MPLS labels into flow keys
and execute actions which push, pop, and set labels on packets.

Based heavily on work by Leo Alterman, Ravi K, Isaku Yamahata and Joe Stringer.

Cc: Ravi K <rkerur@gmail.com>
Cc: Leo Alterman <lalterman@nicira.com>
Cc: Isaku Yamahata <yamahata@valinux.co.jp>
Cc: Joe Stringer <joe@wand.net.nz>
Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Jesse Gross <jesse@nicira.com>
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>

1 files changed, 32 insertions, 0 deletions

diff --git a/include/uapi/linux/openvswitch.h b/include/uapi/linux/openvswitch.h
index 435eabc5ffaa..631056b66f80 100644
--- a/include/uapi/linux/openvswitch.h
+++ b/include/uapi/linux/openvswitch.h
@@ -293,6 +293,9 @@ enum ovs_key_attr {
         OVS_KEY_ATTR_DP_HASH,      /* u32 hash value. Value 0 indicates the hash
                                    is not computed by the datapath. */
         OVS_KEY_ATTR_RECIRC_ID, /* u32 recirc id */
+        OVS_KEY_ATTR_MPLS,      /* array of struct ovs_key_mpls.
+                                 * The implementation may restrict
+                                 * the accepted length of the array. */
 
 #ifdef __KERNEL__
         OVS_KEY_ATTR_TUNNEL_INFO,  /* struct ovs_tunnel_info */
@@ -340,6 +343,10 @@ struct ovs_key_ethernet {
         __u8     eth_dst[ETH_ALEN];
 };
 
+struct ovs_key_mpls {
+        __be32 mpls_lse;
+};
+
 struct ovs_key_ipv4 {
         __be32 ipv4_src;
         __be32 ipv4_dst;
@@ -484,6 +491,19 @@ enum ovs_userspace_attr {
 #define OVS_USERSPACE_ATTR_MAX (__OVS_USERSPACE_ATTR_MAX - 1)
 
 /**
+ * struct ovs_action_push_mpls - %OVS_ACTION_ATTR_PUSH_MPLS action argument.
+ * @mpls_lse: MPLS label stack entry to push.
+ * @mpls_ethertype: Ethertype to set in the encapsulating ethernet frame.
+ *
+ * The only values @mpls_ethertype should ever be given are %ETH_P_MPLS_UC and
+ * %ETH_P_MPLS_MC, indicating MPLS unicast or multicast. Other are rejected.
+ */
+struct ovs_action_push_mpls {
+        __be32 mpls_lse;
+        __be16 mpls_ethertype; /* Either %ETH_P_MPLS_UC or %ETH_P_MPLS_MC */
+};
+
+/**
  * struct ovs_action_push_vlan - %OVS_ACTION_ATTR_PUSH_VLAN action argument.
  * @vlan_tpid: Tag protocol identifier (TPID) to push.
  * @vlan_tci: Tag control identifier (TCI) to push.  The CFI bit must be set
@@ -534,6 +554,15 @@ struct ovs_action_hash {
  * @OVS_ACTION_ATTR_POP_VLAN: Pop the outermost 802.1Q header off the packet.
  * @OVS_ACTION_ATTR_SAMPLE: Probabilitically executes actions, as specified in
  * the nested %OVS_SAMPLE_ATTR_* attributes.
+ * @OVS_ACTION_ATTR_PUSH_MPLS: Push a new MPLS label stack entry onto the
+ * top of the packets MPLS label stack.  Set the ethertype of the
+ * encapsulating frame to either %ETH_P_MPLS_UC or %ETH_P_MPLS_MC to
+ * indicate the new packet contents.
+ * @OVS_ACTION_ATTR_POP_MPLS: Pop an MPLS label stack entry off of the
+ * packet's MPLS label stack.  Set the encapsulating frame's ethertype to
+ * indicate the new packet contents. This could potentially still be
+ * %ETH_P_MPLS if the resulting MPLS label stack is not empty.  If there
+ * is no MPLS label stack, as determined by ethertype, no action is taken.
  *
  * Only a single header can be set with a single %OVS_ACTION_ATTR_SET.  Not all
  * fields within a header are modifiable, e.g. the IPv4 protocol and fragment
@@ -550,6 +579,9 @@ enum ovs_action_attr {
         OVS_ACTION_ATTR_SAMPLE,       /* Nested OVS_SAMPLE_ATTR_*. */
         OVS_ACTION_ATTR_RECIRC,       /* u32 recirc_id. */
         OVS_ACTION_ATTR_HASH,         /* struct ovs_action_hash. */
+        OVS_ACTION_ATTR_PUSH_MPLS,    /* struct ovs_action_push_mpls. */
+        OVS_ACTION_ATTR_POP_MPLS,     /* __be16 ethertype. */
+
         __OVS_ACTION_ATTR_MAX
 };