[docker-sonic-vs]: dd NPU SKU for docker-sonic-vs (sonic-net#15604)

Define a generic 2-port NPU SKU for docker-sonic-vs to 
enable DASH vstests to pass on azure pipelines

Work item tracking
Microsoft ADO 24375371:

How I did it
Define a generic 2-port NPU hwsku that is used only for DASH-specific vstests.

Signed-off-by: Prabhat Aravind <paravind@microsoft.com>

Author: prabhataravind

device/virtual/x86_64-kvm_x86_64-r0/NPU/sai_npu.profile

@@ -0,0 +1,5 @@
+SAI_VS_SWITCH_TYPE=SAI_VS_SWITCH_TYPE_NPU
+SAI_VS_HOSTIF_USE_TAP_DEVICE=true
+SAI_VS_INTERFACE_LANE_MAP_FILE=/usr/share/sonic/hwsku/lanemap.ini
+SAI_VS_CORE_PORT_INDEX_MAP_FILE=/usr/share/sonic/hwsku/coreportindexmap.ini
+SAI_VS_INTERFACE_FABRIC_LANE_MAP_FILE=/usr/share/sonic/hwsku/fabriclanemap.ini

platform/vs/docker-sonic-vs/Dockerfile.j2

@@ -147,6 +147,7 @@ COPY ["zero_profiles.json", "/etc/sonic"]
 COPY ["buffermgrd.sh", "/usr/bin/"]
 
 COPY ["platform.json", "/usr/share/sonic/device/x86_64-kvm_x86_64-r0/"]
+COPY ["platform-npu-2p.json", "/usr/share/sonic/device/x86_64-kvm_x86_64-r0/"]
 COPY ["hwsku.json", "/usr/share/sonic/device/x86_64-kvm_x86_64-r0/Force10-S6000/"]
 COPY ["hwsku.json", "/usr/share/sonic/device/x86_64-kvm_x86_64-r0/brcm_gearbox_vs/"]
 COPY ["hwsku.json", "/usr/share/sonic/device/x86_64-kvm_x86_64-r0/Mellanox-SN2700/"]

platform/vs/docker-sonic-vs/platform-npu-2p.json

@@ -0,0 +1,23 @@
+{
+    "interfaces": {
+        "Ethernet0": {
+            "index": "1,1,1,1",
+            "lanes": "0,1,2,3",
+            "breakout_modes": {
+                "1x100G": ["etp1"],
+                "1x100G[50G,40G,25G,10G]": ["etp1"],
+                "2x50G[25G,10G]": ["etp1a", "etp1b"],
+                "4x10G[25G]": ["etp1a", "etp1b", "etp1c", "etp1d"]
+            }
+        },
+        "Ethernet4": {
+            "index": "2,2,2,2",
+            "lanes": "4,5,6,7",
+            "breakout_modes": {
+                "1x100G": ["etp2"],
+                "1x100G[50G,40G,25G,10G]": ["etp2"],
+                "2x50G[25G,10G]": ["etp2a", "etp2b"]
+            }
+        }
+    }
+}

platform/vs/docker-sonic-vs/start.sh

@@ -8,6 +8,11 @@
 ln -sf /usr/share/sonic/device/$PLATFORM /usr/share/sonic/platform
 ln -sf /usr/share/sonic/device/$PLATFORM/$HWSKU /usr/share/sonic/hwsku
 
+PLATFORM_CONF=platform.json
+if [[ $HWSKU == "NPU-2P" ]]; then
+    PLATFORM_CONF=platform-npu-2p.json
+fi
+
 pushd /usr/share/sonic/hwsku
 
 # filter available front panel ports in lanemap.ini
@@ -45,9 +50,14 @@ if [ -f /etc/sonic/config_db.json ]; then
     mv /tmp/config_db.json /etc/sonic/config_db.json
 else
     # generate and merge buffers configuration into config file
-    sonic-cfggen -k $HWSKU -p /usr/share/sonic/device/$PLATFORM/platform.json -t /usr/share/sonic/hwsku/buffers.json.j2 > /tmp/buffers.json
-    sonic-cfggen -j /etc/sonic/init_cfg.json -t /usr/share/sonic/hwsku/qos.json.j2 > /tmp/qos.json
-    sonic-cfggen -p /usr/share/sonic/device/$PLATFORM/platform.json -k $HWSKU --print-data > /tmp/ports.json
+    if [ -f /usr/share/sonic/hwsku/buffers.json.j2 ]; then
+        sonic-cfggen -k $HWSKU -p /usr/share/sonic/device/$PLATFORM/$PLATFORM_CONF -t /usr/share/sonic/hwsku/buffers.json.j2 > /tmp/buffers.json
+    fi
+    if [ -f /usr/share/sonic/hwsku/qos.json.j2 ]; then
+        sonic-cfggen -j /etc/sonic/init_cfg.json -t /usr/share/sonic/hwsku/qos.json.j2 > /tmp/qos.json
+    fi
+
+    sonic-cfggen -p /usr/share/sonic/device/$PLATFORM/$PLATFORM_CONF -k $HWSKU --print-data > /tmp/ports.json
     # change admin_status from up to down; Test cases dependent
     sed -i "s/up/down/g" /tmp/ports.json
     sonic-cfggen -j /etc/sonic/init_cfg.json -j /tmp/buffers.json -j /tmp/qos.json -j /tmp/ports.json --print-data > /etc/sonic/config_db.json
@@ -56,6 +66,8 @@ sonic-cfggen -t /usr/share/sonic/templates/copp_cfg.j2 > /etc/sonic/copp_cfg.jso
 
 if [ "$HWSKU" == "Mellanox-SN2700" ]; then
     cp /usr/share/sonic/hwsku/sai_mlnx.profile /usr/share/sonic/hwsku/sai.profile
+elif [ "$HWSKU" == "NPU" ]; then
+    cp /usr/share/sonic/hwsku/sai_npu.profile /usr/share/sonic/hwsku/sai.profile
 fi
 
 mkdir -p /etc/swss/config.d/