Add test plan for dash eni counter

docs/testplan/dash/DASH-eni-counter-test-plan.md

@@ -0,0 +1,128 @@
+# DASH eni counter test plan
+
+* [Overview](#Overview)
+   * [HLD](#HLD)
+   * [Scope](#Scope)
+   * [Testbed](#Testbed)
+   * [Setup configuration](#Setup%20configuration)
+* [Test](#Test)
+* [Test cases](#Test%20cases)
+* [TODO](#TODO)
+* [Open questions](#Open%20questions)
+
+## Overview
+The purpose is to verify that Sonic can get the correct eni debug counters.
+By sending dash private link packet make the relevant counter change, and then check the change is expected as the expectation by reading counter db via the redis-cli command.
+
+
+### HLD
+- https://github.com/sonic-net/sonic-swss/pull/3266
+
+### Scope
+The test is targeting a running SONIC system with a dash private link configuration. The purpose of the test is verify the following eni counters can be get correclty from the low layer.  
+   - SAI_ENI_STAT_OUTBOUND_RX_PACKETS
+   - SAI_ENI_STAT_OUTBOUND_RX_BYTES
+   - SAI_ENI_STAT_RX_PACKETS
+   - SAI_ENI_STAT_RX_BYTES
+   - SAI_ENI_STAT_INBOUND_RX_BYTES
+   - SAI_ENI_STAT_INBOUND_RX_PACKETS
+   - SAI_ENI_STAT_OUTBOUND_ROUTING_ENTRY_MISS_DROP_PACKETS
+   - SAI_ENI_STAT_OUTBOUND_CA_PA_ENTRY_MISS_DROP_PACKETS
+   - SAI_ENI_STAT_INBOUND_ROUTING_ENTRY_MISS_DROP_PACKETS
+   - SAI_ENI_STAT_FLOW_CREATED
+   - SAI_ENI_STAT_FLOW_DELETED
+   - SAI_ENI_STAT_FLOW_AGED
+
+### Testbed
+The test will run on all DASH testbeds.
+
+### Setup configuration
+No setup pre-configuration is required, the test will configure and clean up all the configuration.
+
+Common tests configuration:
+- Test will configure basic IPs and routes on NPU and DPU
+- Test will configure private link dash config
+- Test will enalbe eni counter and set polling interval to 1 second for it
+
+Common tests cleanup:
+- Resotre eni counter config
+- Remove the private link dash config
+- Remove the basic IP and route config on NPU and DPU
+
+## Test
+
+## Test cases
+
+### Test case # 1 – test_outbound_pkt_pass_eni_counter
+#### Test objective
+Verify outbound eni counter for normal flow
+#### Test steps
+* Get the eni_counter_before_sending_pkt before sending the dash pkt
+* Send a outbound pkt, and the pkt pass the pipeline successfully
+* Get the eni_counter_after_sending_pkt after sending the dash pkt
+* Check the following counter change as follows by comparing eni_counter_before_sending_pkt with eni_counter_after_sending_pkt
+  * SAI_ENI_STAT_FLOW_CREATED:  +1
+  * SAI_ENI_STAT_OUTBOUND_RX_BYTES:  +len(packet)*packet_number
+  * SAI_ENI_STAT_OUTBOUND_RX_PACKETS: +packet_number
+  * SAI_ENI_STAT_RX_PACKETS: +packet_number
+  * SAI_ENI_STAT_RX_BYTES: +len(packet)*packet_number
+  * SAI_ENI_STAT_FLOW_AGED: +1
+* Parameterize the tests with inner_packet_type(udp, tcp) and outer_encap(vxlan, gre)
+
+### Test case # 2 – test_outbound_pkt_miss_routing_entry_drop_counter
+#### Test objective
+Verify SAI_ENI_STAT_OUTBOUND_ROUTING_ENTRY_MISS_DROP_PACKETS
+#### Test steps
+* Get the eni_counter_before_sending_pkt before sending the dash pkt
+* Send one outbound pkt with inner dst dip which cannot match the dash route
+* Get the eni_counter_after_sending_pkt after sending the dash pkt
+* Check the following counter change as follows by comparing eni_counter_before_sending_pkt with eni_counter_after_sending_pkt
+  * SAI_ENI_STAT_OUTBOUND_ROUTING_ENTRY_MISS_DROP_PACKETS: +1
+* Parameterize the tests with inner_packet_type(udp, tcp) and outer_encap(vxlan, gre)
+
+### Test case # 3 – test_outbound_pkt_ca_pa_entry_miss_drop_counter
+#### Test objective
+Verify SAI_ENI_STAT_OUTBOUND_CA_PA_ENTRY_MISS_DROP_PACKETS
+#### Test steps
+* Get the eni_counter_before_sending_pkt before sending the dash pkt
+* Send a outbound pkt that matches to routing but no ca_to_pa exist for the vnet ID
+* Get the eni_counter_after_sending_pkt after sending the dash pkt
+* Check the following counter change as follows by comparing eni_counter_before_sending_pkt with eni_counter_after_sending_pkt
+  * SAI_ENI_STAT_OUTBOUND_CA_PA_ENTRY_MISS_DROP_PACKETS: +1
+* Parameterize the tests with inner_packet_type(udp, tcp) and outer_encap(vxlan, gre)
+
+### Test case # 4 – test_eni_flow_deleted_counter
+#### Test objective
+Verify SAI_ENI_STAT_FLOW_DELETED
+#### Test steps
+* Send 1 pass TCP SYN packet
+* Get the eni_counter_before_sending_pkt before sending the dash pkt
+* Send 1 pass RST packet
+* Get the eni_counter_after_sending_pkt before sending the dash pkt
+* Check the following counter change as follows by comparing eni_counter_before_sending_pkt with eni_counter_after_sending_pkt
+  * SAI_ENI_STAT_FLOW_DELETED increase by 1
+* Parameterize the tests with outer_encap(vxlan, gre)
+
+### Test case # 4 – test_inbound_pkt_eni_counter
+#### Test objective
+Verify inbound eni counters
+#### Test steps
+* Get the eni_counter_before_sending_pkt before sending the dash pkt
+* Send a outbound pkt and a inbound pkt
+* Get the eni_counter_after_sending_pkt after sending the dash pkt
+* Check the following counter change as follows by comparing eni_counter_before_sending_pkt with eni_counter_after_sending_pkt
+  * SAI_ENI_STAT_FLOW_CREATED: +1
+  *  SAI_ENI_STAT_INBOUND_RX_BYTES: +len(inbound_packet)*packet_number
+  *  SAI_ENI_STAT_INBOUND_RX_PACKETS: +packet_number
+  *  SAI_ENI_STAT_RX_PACKETS: +packet_number*2
+  *  SAI_ENI_STAT_RX_BYTES: +len(inbound_packet)*packet_number + len(outbound_packet)*packet_number
+  *  SAI_ENI_STAT_FLOW_AGED: +1
+* Send a inbound pkt without inbound route
+* Get the eni_counter_after_sending_pkt after sending the inbound pkt
+* Check the following counter change as follows by comparing eni_counter_before_sending_pkt with eni_counter_after_sending_pkt
+  * SAI_ENI_STAT_INBOUND_ROUTING_ENTRY_MISS_DROP_PACKETS: +packet_number
+* Parameterize the tests with inner_packet_type(udp, tcp) and outer_encap(vxlan, gre)
+
+## TODO
+
+## Open questions