Hello,
We have been referring the RYU source code to understand the OF Specific
instructions primarily OFV1.1, OFV1.2, OFV1.3,OFV1.4 and OFV1.5.
Currently while simulating the tests with Instruction OFPIT_STAT_TRIGGER
(Specification EXT-335) we got couple of Open points to understand more on
the implementation part which needs more clarity to understand.
As part of the Specification details for the EXT-335 we understand that
"This Instruction is primarily required to send out Openflow Extensible
stats (as part of flexible encoding) to Controller based on certain
thresholds which are user defined". Please correct my understanding for
the same?
So this is how the Instruction looks with the bitmap Flags shown below:
enum ofp_stat_trigger_flags {
OFPSTF_PERIODIC = 1 << 0, /* Trigger for all multiples of thresholds. */
OFPSTF_ONLY_FIRST = 1 << 1, /* Trigger on only first reach threshold. */
};
/* Instruction structure for OFPIT_STAT_TRIGGER */
struct ofp_instruction_stat_trigger {
uint16_t type; /* OFPIT_STAT_TRIGGER */
uint16_t len;
uint32_t flags;
struct ofp_stats thresholds;
};
OFP_ASSERT(sizeof(struct ofp_instruction_stat_trigger) == 16);
Based on the above understanding and the current RYU implementation it is
unclear of how the Flags and thresholds are derived and based on what?
Because if we really see the RYU python scripts for VERSION1.5 we see the
hardcoded values for duration, idle_time , flow_count, packet_count, and
byte_count as part of the OXS fields filling.
For our understanding we are not clear on how can we decide on the above
Fields of when the Instruction trigger needs to set the PERIODIC FLAG or
ONLY_FIRST flag as part of the FLOW_STATS REPLY To controller.
Much appreciate your response for the same.
Thanks & Regards
Poonam Ghosh
Technical Architect, TCS
=====-----=====-----=====
Notice: The information contained in this e-mail
message and/or attachments to it may contain
confidential or privileged information. If you are
not the intended recipient, any dissemination, use,
review, distribution, printing or copying of the
information contained in this e-mail message
and/or attachments to it are strictly prohibited. If
you have received this communication in error,
please notify us by reply e-mail or telephone and
immediately and permanently delete the message
and any attachments. Thank you
------------------------------------------------------------------------------
_______________________________________________
Ryu-devel mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/ryu-devel
