[sflow] Add egress sflow support. (#14630)

* [sflow] Add egress sflow support.
- Updated sonic-yang-model
- change hsflowd version to 2.0.45

rules/sflow.mk

@@ -1,6 +1,6 @@
 # host-sflow package
 
-HSFLOWD_VERSION = 2.0.35
+HSFLOWD_VERSION = 2.0.45
 HSFLOWD_SUBVERSION = 1
 
 export ENABLE_SFLOW_DROPMON

src/sonic-yang-models/doc/Configuration.md

@@ -1776,7 +1776,8 @@ SFLOW
 
 | Field            | Description                                                                             | Mandatory   | Default   | Reference                                 |
 |------------------|-----------------------------------------------------------------------------------------|-------------|-----------|-------------------------------------------|
-| admin_state      | Global sflow admin state                                                                |             | down      |                                           |
+| admin_state      | Global sflow admin state                                                                |             | down      |    
+| sample_direction | Global sflow sample direction                                                           |             | rx        |                                        |
 | polling_interval | The interval within which sFlow data is collected and sent to the configured collectors |             | 20        |                                           |
 | agent_id         | Interface name                                                                          |             |           | PORT:name,PORTCHANNEL:name,MGMT_PORT:name, VLAN:name |
 
@@ -1788,7 +1789,7 @@ key - port
 | port        | Sets sflow session table attributes for either all interfaces or a specific Ethernet interface.                         |             |           | PORT:name   |
 | admin_state | Per port sflow admin state                                                                                              |             | up        |             |
 | sample_rate | Sets the packet sampling rate.  The rate is expressed as an integer N, where the intended sampling rate is 1/N packets. |             |           |             |
-
+| sample_direction| Per port sflow sample direction                                                                                               |             |   rx
 SFLOW_COLLECTOR
 
 key - name

src/sonic-yang-models/tests/yang_model_tests/tests_config/sflow.json

@@ -144,6 +144,7 @@
                     {
                         "port": "Ethernet0",
                         "admin_state": "up",
+                        "sample_direction": "both",
                         "sample_rate": "40000"
                     }
                 ]
@@ -158,6 +159,7 @@
                     {
                         "port": "Ethernet4",
                         "admin_state": "down",
+                        "sample_direction": "tx",
                         "sample_rate": "32768"
                     }
                 ]
@@ -242,6 +244,7 @@
                 "global": {
                     "agent_id": "Ethernet0",
                     "admin_state": "up",
+                    "sample_direction": "both",
                     "polling_interval": "20"
                 }
             }

src/sonic-yang-models/yang-models/sonic-sflow.yang

@@ -32,10 +32,28 @@ module sonic-sflow{
 
     description "SFLOW yang Module for SONiC OS";
 
+    revision 2023-04-11 {
+        description "Add direction command to support egress sflow";
+    }
+
     revision 2021-04-26 {
         description "First Revision";
     }
 
+    typedef sample_direction {
+        type enumeration {
+            enum rx {
+                description "rx direction";
+            }
+            enum tx {
+                description "tx direction";
+            }
+            enum both {
+                description "Both tx and rx direction";
+            }
+        }
+    }
+
     container sonic-sflow {
 
         container SFLOW_COLLECTOR {
@@ -111,6 +129,13 @@ module sonic-sflow{
                     }
                     description "Sets the packet sampling rate.  The rate is expressed as an integer N, where the intended sampling rate is 1/N packets.";
                 }
+
+                leaf sample_direction {
+                    type sample_direction;
+                    default "rx";
+                    description "sflow sample direction";
+                }
+
             } /* end of list SFLOW_SESSION_LIST */
         } /* end of container SFLOW_SESSION */
 
@@ -156,6 +181,13 @@ module sonic-sflow{
                     }
                     description "Interface name";
                 }
+
+                leaf sample_direction {
+                    type sample_direction;
+                    default "rx";
+                    description "sflow sample direction";
+                }
+
             } /* end of container global */
        } /* end of container SFLOW */