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Introduce ofpacts, an abstraction of OpenFlow actions.

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OpenFlow actions have always been somewhat awkward to handle.
Moreover, over time we've started creating actions that require more
complicated parsing.  When we maintain those actions internally in
their wire format, we end up parsing them multiple times, whenever
we have to look at the set of actions.

When we add support for OpenFlow 1.1 or later protocols, the situation
will get worse, because these newer protocols support many of the same
actions but with different representations.  It becomes unrealistic to
handle each protocol in its wire format.

This commit adopts a new strategy, by converting OpenFlow actions into
an internal form from the wire format when they are read, and converting
them back to the wire format when flows are dumped.  I believe that this
will be more maintainable over time.

Thanks to Simon Horman and Pravin Shelar for reviews.

Signed-off-by: Ben Pfaff <blp@nicira.com>
This commit is contained in:
Ben Pfaff
2012-07-03 22:17:14 -07:00
parent 690a61c50a
commit f25d0cf3c3
36 changed files with 3380 additions and 2112 deletions
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18
lib/multipath.h
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@@ -1,5 +1,5 @@
/*
* Copyright (c) 2010, 2011 Nicira, Inc.
* Copyright (c) 2010, 2011, 2012 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -23,18 +23,24 @@
struct ds;
struct flow;
struct nx_action_multipath;
struct nx_action_reg_move;
struct ofpact_multipath;
struct ofpbuf;
/* NXAST_MULTIPATH helper functions.
*
* See include/openflow/nicira-ext.h for NXAST_MULTIPATH specification.
*/
enum ofperr multipath_check(const struct nx_action_multipath *,
enum ofperr multipath_from_openflow(const struct nx_action_multipath *,
struct ofpact_multipath *);
enum ofperr multipath_check(const struct ofpact_multipath *,
const struct flow *);
void multipath_execute(const struct nx_action_multipath *, struct flow *);
void multipath_to_nxast(const struct ofpact_multipath *,
struct ofpbuf *openflow);
void multipath_parse(struct nx_action_multipath *, const char *);
void multipath_format(const struct nx_action_multipath *, struct ds *);
void multipath_execute(const struct ofpact_multipath *, struct flow *);
void multipath_parse(struct ofpact_multipath *, const char *);
void multipath_format(const struct ofpact_multipath *, struct ds *);
#endif /* multipath.h */