Allow vendors to define their own actions. Actions were originally fixed-
length, which was a bit constraining. Actions now contain a length field,
which gives them more flexibility.
This cleans up the handling of modifying existing flows. There now exists
OFPFC_MODIFY and OFPFC_MODIFY_STRICT commands, which have the same matching
characteristics to their OFPFC_DELETE* counterparts. When adding a flow that
already exists, the counters and timers are now reset (ie, its treated as a
new flow). This commit also adds the "--strict" option to dpctl to allow
strict matching for "mod-flows" and "del-flows".
There was little point in taking the dp_mutex farther down in the
code than dp_genl_openflow, since that function is already completely
serialized by genl_rcv across the genl_mutex. We could get rid of
dp_mutex completely, except that we still need it to serialize timeout.
These code paths are fully protected by the Generic Netlink genl_mutex,
which is taken by genl_rcv() that calls dp_genl_openflow(), so there is
no need for them to take the rcu_read_lock.
Justin Pettit
Ben Pfaff
Ben Pfaff
Martin Casado