[smartswitch] Add support for ENI Based Forwarding (sonic-net#3398)

* [smartswitch] Add support for ENI Based Forwarding
HLD: sonic-net/SONiC#1842
Requires sonic-net/sonic-swss-common#976
Add DashEniFwdOrch which installs ACL rules to Redirect the DASH packet to corresponding DPU

orchagent/Makefile.am

@@ -107,6 +107,8 @@ orchagent_SOURCES = \
             response_publisher.cpp \
             nvgreorch.cpp \
             zmqorch.cpp \
+            dash/dashenifwdorch.cpp \
+            dash/dashenifwdinfo.cpp \
             dash/dashorch.cpp \
             dash/dashrouteorch.cpp \
             dash/dashvnetorch.cpp \

orchagent/aclorch.cpp

@@ -51,6 +51,8 @@ extern Directory<Orch*> gDirectory;
 
 const int TCP_PROTOCOL_NUM = 6; // TCP protocol number
 
+#define MAC_EXACT_MATCH "ff:ff:ff:ff:ff:ff"
+
 acl_rule_attr_lookup_t aclMatchLookup =
 {
     { MATCH_IN_PORTS,          SAI_ACL_ENTRY_ATTR_FIELD_IN_PORTS },
@@ -79,6 +81,8 @@ acl_rule_attr_lookup_t aclMatchLookup =
     { MATCH_TUNNEL_VNI,        SAI_ACL_ENTRY_ATTR_FIELD_TUNNEL_VNI },
     { MATCH_INNER_ETHER_TYPE,  SAI_ACL_ENTRY_ATTR_FIELD_INNER_ETHER_TYPE },
     { MATCH_INNER_IP_PROTOCOL, SAI_ACL_ENTRY_ATTR_FIELD_INNER_IP_PROTOCOL },
+    { MATCH_INNER_SRC_MAC,     SAI_ACL_ENTRY_ATTR_FIELD_INNER_SRC_MAC },
+    { MATCH_INNER_DST_MAC,     SAI_ACL_ENTRY_ATTR_FIELD_INNER_DST_MAC },
     { MATCH_INNER_L4_SRC_PORT, SAI_ACL_ENTRY_ATTR_FIELD_INNER_L4_SRC_PORT },
     { MATCH_INNER_L4_DST_PORT, SAI_ACL_ENTRY_ATTR_FIELD_INNER_L4_DST_PORT },
     { MATCH_BTH_OPCODE,        SAI_ACL_ENTRY_ATTR_FIELD_BTH_OPCODE},
@@ -648,6 +652,7 @@ void AclRule::TunnelNH::clear()
     vxlan_orch->removeNextHopTunnel(tunnel_name, endpoint_ip, mac, vni);
 }
 
+
 string AclTableType::getName() const
 {
     return m_name;
@@ -908,6 +913,13 @@ bool AclRule::validateAddMatch(string attr_name, string attr_value)
         {
             matchData.data.booldata = (attr_name == "true");
         }
+        else if (attr_name == MATCH_INNER_DST_MAC || attr_name == MATCH_INNER_SRC_MAC)
+        {
+            swss::MacAddress mac(attr_value);
+            swss::MacAddress mask(MAC_EXACT_MATCH);
+            memcpy(matchData.data.mac, mac.getMac(), sizeof(sai_mac_t));
+            memcpy(matchData.mask.mac, mask.getMac(), sizeof(sai_mac_t));
+        }
         else if (attr_name == MATCH_IN_PORTS)
         {
             auto ports = tokenize(attr_value, ',');

orchagent/aclorch.h

@@ -51,6 +51,8 @@
 #define MATCH_INNER_IP_PROTOCOL "INNER_IP_PROTOCOL"
 #define MATCH_INNER_L4_SRC_PORT "INNER_L4_SRC_PORT"
 #define MATCH_INNER_L4_DST_PORT "INNER_L4_DST_PORT"
+#define MATCH_INNER_SRC_MAC     "INNER_SRC_MAC"
+#define MATCH_INNER_DST_MAC     "INNER_DST_MAC"
 #define MATCH_BTH_OPCODE        "BTH_OPCODE"
 #define MATCH_AETH_SYNDROME     "AETH_SYNDROME"
 #define MATCH_TUNNEL_TERM       "TUNNEL_TERM"