Add gearbox phy device files and a new physyncd docker to support VS gearbox phy feature

device/virtual/x86_64-kvm_x86_64-r0/README.md

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+# Changing the virtual device
+
+You can control the hw sku and default factory configuration for the VS image 
+by modifying the content of the file default_sku in this directory. 
+
+The format of default_sku is a single line:
+
+```
+<hw_key> <default_preset>
+```
+
+## Allowable values for hw_key
+
+| hw_key | Device |
+| ------ | ------ |
+| Force10-S6000 | Dell Force10 S6000|
+| brcm_gearbox_vs | Similar to Force10-S6000, but implements a virtual BRCM81724 Gearbox Phy |
+
+## Allowable values for default_preset
+
+These include "t1", "l2", and "empty". See the file 
+sonic-buildimage/src/sonic-config-engine/config_samples.py for details on how 
+each default_preset value is interpreted.
+
+# Changing the hwsku of an existing VS switch
+
+To change the default hwsku for a VS image that has already been built and installed, follow these steps:
+
+- Edit /usr/share/sonic/device/x86_64-kvm_x86_64-r0/default_sku. For details, see the section below (Device Specific Documentation)
+- Edit /etc/sonic/config_db.json, and change the "hwsku" key in DEVICE_METADATA:localhost to match the hw_key used in default_sku. Example:
+
+  "DEVICE_METADATA": {
+    "localhost": {
+        ...
+        "hwsku": "brcm_gearbox_vs",
+        ...
+    }
+  },
+  ...
+- Reboot the switch
+- Use "show platform summary" to verify, and follow any steps specific to the platform, as needed, such as those described below for the brcm_gearbox_vs hwsku.
+
+# Device Specific Documentation
+
+For general info on building, see https://github.com/Azure/sonic-buildimage/blob/master/README.md
+
+## Force-10-S6000
+
+This is the default VS for SONiC. To enable, set contents of default_sku to:
+
+```
+Force10-S6000 t1
+```
+
+To build:
+
+```
+make init
+make configure PLATFORM=vs
+make target/sonic-vs.img.gz
+```
+
+## brcm_gearbox_vs
+
+This sku simulates a device with a Broadcom BRCM81724 gearbox PHY. To enable,
+set default_sku to:
+
+
+```
+brcm_gearbox_vs t1
+```
+
+To build (same as Force-10-S6000):
+
+```
+make init
+make configure PLATFORM=vs
+make target/sonic-vs.img.gz
+```
+
+To verify, install and bring up SONiC. There will be a new gbsyncd docker 
+which is designed to respond to configuration directed towards the gearbox phy
+"switch". swss will create that gearbox switch on startup after detecting the
+gearbox is present (this is done by a short lived gearsyncd that runs in the
+swss docker). 
+
+The commands "show gearbox interfaces status" and "show gearbox phys" can be 
+used to verify the virtual gearbox phy has been created. See https://github.com/Azure/sonic-utilities/blob/master/doc/Command-Reference.md#gearbox for details.

device/virtual/x86_64-kvm_x86_64-r0/brcm_gearbox_vs/buffers.json.j2

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+{%- set default_topo = 't1' %}
+{%- include 'buffers_config.j2' %}
+

device/virtual/x86_64-kvm_x86_64-r0/brcm_gearbox_vs/buffers_defaults_def.j2

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+{%- set default_cable = '300m' %}
+
+{%- macro generate_port_lists(PORT_ALL) %}
+    {# Generate list of ports #}
+    {% for port_idx in range(0,32) %}
+        {% if PORT_ALL.append("Ethernet%d" % (port_idx * 4)) %}{% endif %}
+    {% endfor %}
+{%- endmacro %}
+
+{%- macro generate_buffer_pool_and_profiles() %}
+    "BUFFER_POOL": {
+        "ingress_lossless_pool": {
+            "size": "12766208",
+            "type": "ingress",
+            "mode": "dynamic"
+        },
+        "egress_lossless_pool": {
+            "size": "12766208",
+            "type": "egress",
+            "mode": "static"
+        },
+        "egress_lossy_pool": {
+            "size": "7326924",
+            "type": "egress",
+            "mode": "dynamic"
+        }
+    },
+    "BUFFER_PROFILE": {
+        "ingress_lossy_profile": {
+            "pool":"[BUFFER_POOL|ingress_lossless_pool]",
+            "size":"0",
+            "dynamic_th":"3"
+        },
+        "egress_lossless_profile": {
+            "pool":"[BUFFER_POOL|egress_lossless_pool]",
+            "size":"0",
+            "static_th":"12766208"
+        },
+        "egress_lossy_profile": {
+            "pool":"[BUFFER_POOL|egress_lossy_pool]",
+            "size":"1518",
+            "dynamic_th":"3"
+        }
+    },
+{%- endmacro %}

device/virtual/x86_64-kvm_x86_64-r0/brcm_gearbox_vs/buffers_defaults_t0.j2

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+{%- set default_cable = '300m' %}
+
+{%- macro generate_port_lists(PORT_ALL) %}
+    {# Generate list of ports #}
+    {% for port_idx in range(0,32) %}
+        {% if PORT_ALL.append("Ethernet%d" % (port_idx * 4)) %}{% endif %}
+    {% endfor %}
+{%- endmacro %}
+
+{%- macro generate_buffer_pool_and_profiles() %}
+    "BUFFER_POOL": {
+        "ingress_lossless_pool": {
+            "size": "12766208",
+            "type": "ingress",
+            "mode": "dynamic"
+        },
+        "egress_lossless_pool": {
+            "size": "12766208",
+            "type": "egress",
+            "mode": "static"
+        },
+        "egress_lossy_pool": {
+            "size": "7326924",
+            "type": "egress",
+            "mode": "dynamic"
+        }
+    },
+    "BUFFER_PROFILE": {
+        "ingress_lossy_profile": {
+            "pool":"[BUFFER_POOL|ingress_lossless_pool]",
+            "size":"0",
+            "dynamic_th":"3"
+        },
+        "egress_lossless_profile": {
+            "pool":"[BUFFER_POOL|egress_lossless_pool]",
+            "size":"0",
+            "static_th":"12766208"
+        },
+        "egress_lossy_profile": {
+            "pool":"[BUFFER_POOL|egress_lossy_pool]",
+            "size":"1518",
+            "dynamic_th":"3"
+        }
+    },
+{%- endmacro %}

device/virtual/x86_64-kvm_x86_64-r0/brcm_gearbox_vs/buffers_defaults_t1.j2

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+{%- set default_cable = '300m' %}
+
+{%- macro generate_port_lists(PORT_ALL) %}
+    {# Generate list of ports #}
+    {% for port_idx in range(0,32) %}
+        {% if PORT_ALL.append("Ethernet%d" % (port_idx * 4)) %}{% endif %}
+    {% endfor %}
+{%- endmacro %}
+
+{%- macro generate_buffer_pool_and_profiles() %}
+    "BUFFER_POOL": {
+        "ingress_lossless_pool": {
+            "size": "12766208",
+            "type": "ingress",
+            "mode": "dynamic"
+        },
+        "egress_lossless_pool": {
+            "size": "12766208",
+            "type": "egress",
+            "mode": "static"
+        },
+        "egress_lossy_pool": {
+            "size": "7326924",
+            "type": "egress",
+            "mode": "dynamic"
+        }
+    },
+    "BUFFER_PROFILE": {
+        "ingress_lossy_profile": {
+            "pool":"[BUFFER_POOL|ingress_lossless_pool]",
+            "size":"0",
+            "dynamic_th":"3"
+        },
+        "egress_lossless_profile": {
+            "pool":"[BUFFER_POOL|egress_lossless_pool]",
+            "size":"0",
+            "static_th":"12766208"
+        },
+        "egress_lossy_profile": {
+            "pool":"[BUFFER_POOL|egress_lossy_pool]",
+            "size":"1518",
+            "dynamic_th":"3"
+        }
+    },
+{%- endmacro %}

device/virtual/x86_64-kvm_x86_64-r0/brcm_gearbox_vs/context_config.json

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+{
+    "CONTEXTS": [
+        {
+            "guid" : 0,
+            "name" : "sw0",
+            "dbAsic" : "ASIC_DB",
+            "dbCounters" : "COUNTERS_DB",
+            "dbFlex": "FLEX_COUNTER_DB",
+            "dbState" : "STATE_DB",
+            "switches": [
+                {
+                    "index" : 0,
+                    "hwinfo" : ""
+                }
+            ]
+        },
+        {
+            "guid" : 1,
+            "name" : "phy1",
+            "dbAsic" : "GB_ASIC_DB",
+            "dbCounters" : "GB_COUNTERS_DB",
+            "dbFlex": "GB_FLEX_COUNTER_DB",
+            "dbState" : "STATE_DB",
+            "switches": [
+                {
+                    "index" : 1,
+                    "hwinfo" : ""
+                }
+            ]
+        }
+    ]
+}

device/virtual/x86_64-kvm_x86_64-r0/brcm_gearbox_vs/gearbox_config.json

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+{
+  "phys": [
+    {
+      "phy_id": 1,
+      "name": "sesto-1",
+      "address": "0x1000",
+      "lib_name": "libsai_phy_sesto-1.so",
+      "firmware_path": "/tmp/phy-sesto-1.bin",
+      "config_file": "/usr/share/sonic/hwsku/phy1_config_1.json",
+      "sai_init_config_file": "/usr/share/sonic/hwsku/sesto-1.bcm",
+      "phy_access": "mdio",
+      "bus_id": 0
+    }
+  ],
+  "interfaces": [
+    {
+      "name": "Ethernet0",
+      "index": 0,
+      "phy_id" : 1,
+      "system_lanes": [200,201],
+      "line_lanes": [206]
+    },
+    {
+      "name": "Ethernet4",
+      "index": 1,
+      "phy_id" : 1,
+      "system_lanes": [202,203],
+      "line_lanes": [207]
+    },
+    {
+      "name": "Ethernet8",
+      "index": 2,
+      "phy_id" : 1,
+      "system_lanes": [204,205],
+      "line_lanes": [208]
+    }
+  ]
+}

device/virtual/x86_64-kvm_x86_64-r0/brcm_gearbox_vs/lanemap.ini

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+eth1:25,26,27,28    
+eth2:29,30,31,32    
+eth3:33,34,35,36    
+eth4:37,38,39,40    
+eth5:45,46,47,48    
+eth6:41,42,43,44    
+eth7:1,2,3,4        
+eth8:5,6,7,8        
+eth9:13,14,15,16    
+eth10:9,10,11,12     
+eth11:17,18,19,20    
+eth12:21,22,23,24    
+eth13:53,54,55,56    
+eth14:49,50,51,52    
+eth15:57,58,59,60    
+eth16:61,62,63,64    
+eth17:69,70,71,72    
+eth18:65,66,67,68    
+eth19:73,74,75,76    
+eth20:77,78,79,80    
+eth21:109,110,111,112
+eth22:105,106,107,108
+eth23:113,114,115,116
+eth24:117,118,119,120
+eth25:125,126,127,128
+eth26:121,122,123,124
+eth27:81,82,83,84    
+eth28:85,86,87,88    
+eth29:93,94,95,96    
+eth30:89,90,91,92    
+eth31:101,102,103,104
+eth32:97,98,99,100  

device/virtual/x86_64-kvm_x86_64-r0/brcm_gearbox_vs/pg_profile_lookup.ini

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+# PG lossless profiles.
+# speed cable size      xon     xoff   threshold xon_offset
+  10000  5m   56368     18432   55120  -3        2496
+  25000  5m   56368     18432   55120  -3        2496
+  40000  5m   56368     18432   55120  -3        2496
+  50000  5m   56368     18432   55120  -3        2496
+ 100000  5m   56368     18432   55120  -3        2496
+  10000  40m  56368     18432   55120  -3        2496
+  25000  40m  56368     18432   55120  -3        2496
+  40000  40m  56368     18432   55120  -3        2496
+  50000  40m  56368     18432   55120  -3        2496
+ 100000  40m  56368     18432   55120  -3        2496
+  10000  300m 56368     18432   55120  -3        2496
+  25000  300m 56368     18432   55120  -3        2496
+  40000  300m 56368     18432   55120  -3        2496
+  50000  300m 56368     18432   55120  -3        2496
+ 100000  300m 56368     18432   55120  -3        2496