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feature/gribi/ate_tests/ipv4_entry_test/README.md

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+# TE-2.1: gRIBI IPv4 Entry
+
+## Summary
+
+Validate IPv4 support in gRIBI.
+
+## Procedure
+
+*   Connect ATE port-1 to DUT port-1, ATE port-2 to DUT port-2, and ATE port-3
+    to DUT port-3.
+*   Establish gRIBI client connection with DUT negotiating RIB_AND_FIB_ACK as
+    the requested ack_type.
+*   Using gRIBI Modify RPC install the following IPv4Entry sets, and validate
+    the specified behaviours:
+    *   Single IPv4Entry -> NHG -> NH.
+        *   Install 198.51.100.0/24 to NextHopGroup containing one NextHop
+            specified to ATE port-2.
+        *   Forward packets between ATE port-1 and ATE port-2 (destined to
+            198.51.100.0/24 ) and determine that packets are forwarded
+            successfully:
+    *   Single IPv4Entry -> NHG -> multiple NHs.
+        *   Install 198.51.100.0/24 to NextHopGroup containing two NextHop
+            entries specified to ATE ports 2 and 3.
+        *   Validate that packets forwarded between ATE ports 1 and (2 and 3),
+            ensuring that traffic is forwarded.
+    *   Single IPv4Entry -> NHG -> non-existent NH.
+        *   Send a Modify() containing 2 AFTOperations that Install
+            198.51.100.0/24 to NextHopGroup containing next-hops that do not
+            exist. Validate that FAILED error is received for all the 2
+            operations. Ensure that traffic to 198.51.100.0/24 is blackholed.
+    *   Single IPv4Entry -> NHG -> NH with down interface
+        *   Install 198.51.100.0/24 to NextHopGroup containing a NextHop that
+            references (interface_ref) a down interface and override the
+            destination MAC (mac_address), ensure that FIB_PROGRAMMED is
+            returned.
+
+## Config Parameter coverage
+
+N/A
+
+## Telemetry Parameter coverage
+
+N/A
+
+## Protocol/RPC Parameter coverage
+
+*   gRIBI
+    *   Modify()
+        *   ModifyRequest:
+            *   AFTOperation:
+                *   id
+                *   network_instance
+                *   op
+                *   Ipv4
+                    *   Ipv4EntryKey: prefix
+                    *   Ipv4Entry: next_hop_group
+                *   next_hop_group
+                    *   NextHopGroupKey: id
+                    *   NextHopGroup: next_hop
+                *   next_hop
+                    *   NextHopKey: id
+                    *   NextHop:
+                        *   ip_address
+        *   ModifyResponse:
+            *   AFTResult:
+                *   id
+                *   status