learn: Fix bugs when learn actions use subfields wider than 64 bits.

[openvswitch] / include / openflow / nicira-ext.h

diff --git a/include/openflow/nicira-ext.h b/include/openflow/nicira-ext.h
index 7586a520ed49318d32f648f9855c3e1df3c41699..f8b863c9b976503da6ae42cc81347ed5c6329360 100644 (file)
--- a/include/openflow/nicira-ext.h
+++ b/include/openflow/nicira-ext.h
@@ -787,6 +787,9 @@ enum nx_mp_algorithm {
  *     field[ofs:ofs+n_bits-1].  Actions are executed in the same order as the
  *     flow_mod_specs.
  *
+ *     A single NXAST_REG_LOAD action writes no more than 64 bits, so n_bits
+ *     greater than 64 yields multiple NXAST_REG_LOAD actions.
+ *
  * The flow_mod_spec destination spec for 'dst' of 2 (when 'src' is 0) is
  * empty.  It has the following meaning:
  *