Methods, systems, and computer readable media for detecting retry window invocation for testing link level retry (llr)

A system for detecting link level retry (LLR) window invocation by a device under test (DUT), the system comprising:

• at least one processor;
• and
• a memory storing instructions that, when executed by the at least one processor, cause the system to:
• receive, by a test device emulating a link level receiver, LLR-eligible frames having expected sequence numbers transmitted by the DUT;
• determine a next expected sequence number of the LLR-eligible frames;
• store a last good sequence number of an LLR-eligible frame received immediately before receiving a plurality of LLR-eligible frames having sequence numbers that are greater than the next expected sequence number;
• store a highest sequence number of the sequence numbers of the plurality of LLR-eligible frames having the sequence numbers that are greater than the next expected sequence number;
• and
• identify, using the last good sequence number and the highest sequence number, when the DUT is transmitting frames within a retry window;
• and verify at least one behavior of the DUT within the retry window.

A non-transitory computer readable medium having stored thereon computer executable instructions that when executed by at least one processor of a test device emulating a link level receiver cause the test device to:

• receive LLR-eligible frames having expected sequence numbers transmitted by a device under test (DUT);
• determine a next expected sequence number of the LLR-eligible frames;
• store a last good sequence number of an LLR-eligible frame received immediately before receiving a plurality of LLR-eligible frames having sequence numbers that are greater than the next expected sequence number;
• store a highest sequence number of the sequence numbers of the plurality of LLR-eligible frames having the sequence numbers that are greater than the next expected sequence number;
• identify, using the last good sequence number and the highest sequence number, when the DUT is transmitting frames within a retry window;
• and
• verify at least one behavior of the DUT within the retry window.