This commit adds a new function "bfd_wake_time()" that returns the
next wakeup time associated with the "struct bfd".
Signed-off-by: Alex Wang <alexw@nicira.com>
Signed-off-by: Ethan Jackson <ethan@nicira.com>
Acked-by: Ethan Jackson <ethan@nicira.com>
When there is no incoming data traffic at the interface for a period,
BFD decay allows the bfd session to increase the min_rx. This is
helpful in that some interfaces may usually be idle for a long time.
And cpu consumption can be reduced by processing fewer bfd control
packets.
Signed-off-by: Alex Wang <alexw@nicira.com>
Signed-off-by: Ethan Jackson <ethan@nicira.com>
Acked-by: Ethan Jackson <ethan@nicira.com>
This change adds the check_tnl_key functionality for BFD.
When the feature is enabled, BFD will only accept control
packets with a tunnel key of 0.
Signed-off-by: Pavithra Ramesh <paramesh@vmware.com>
Acked-by: Ethan Jackson <ethan@nicira.com>
A number of fields are looked at when determining whether special
processing (slow-path) is needed. This commit removes wildcarding when
they were consulted.
Reported-by: Ethan Jackson <ethan@nicira.com>
Reported-by: Paul Ingram <paul@nicira.com>
Signed-off-by: Justin Pettit <jpettit@nicira.com>
Traditionally, Open vSwitch has used a variant of 802.1ag "CFM" for
interface liveness detection. This has served us well until now,
but has several serious drawbacks which have steadily become more
inconvenient. First, the 802.1ag standard does not implement
several useful features forcing us to (optionally) break
compatibility. Second, 802.1.ag is not particularly popular
outside of carrier grade networking equipment. Third, 802.1ag is
simply quite awkward.
In an effort to solve the aforementioned problems, this patch
implements BFD which is ubiquitous, well designed, straight
forward, and implements required features in a standard way. The
initial cut of the protocol focuses on getting the basics of the
specification correct, leaving performance optimizations, and
advanced features as future work. The protocol should be
considered experimental pending future testing.
Signed-off-by: Ethan Jackson <ethan@nicira.com>
