User-Space MPLS actions and matches

This patch implements use-space datapath and non-datapath code
to match and use the datapath API set out in Leo Alterman's patch
"user-space datapath: Add basic MPLS support to kernel".

The resulting MPLS implementation supports:
* Pushing a single MPLS label
* Poping a single MPLS label
* Modifying an MPLS lable using set-field or load actions
  that act on the label value, tc and bos bit.
* There is no support for manipulating the TTL
  this is considered future work.

The single-level push pop limitation is implemented by processing
push, pop and set-field/load actions in order and discarding information
that would require multiple levels of push/pop to be supported.

e.g.
   push,push -> the first push is discarded
   pop,pop -> the first pop is discarded

This patch is based heavily on work by Ravi K.

Cc: Ravi K <rkerur@gmail.com>
Reviewed-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Ben Pfaff <blp@nicira.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/tests/test-bundle.c b/tests/test-bundle.c
index aa8b6f0f4..f5b24b4a3 100644
--- a/tests/test-bundle.c
+++ b/tests/test-bundle.c
@@ -137,6 +137,7 @@ main(int argc, char *argv[])
     for (i = 0; i < N_FLOWS; i++) {
         random_bytes(&flows[i], sizeof flows[i]);
         memset(flows[i].zeros, 0, sizeof flows[i].zeros);
+        flows[i].mpls_depth = 0;
         flows[i].regs[0] = OFPP_NONE;
     }