📃 docs(packet io description)::Update the description of the main process

1 files changed, 35 insertions, 13 deletions

diff --git a/readme.md b/readme.md
index fa64dfc..f21dd40 100644
--- a/readme.md
+++ b/readme.md
@@ -1,6 +1,6 @@
 # Stellar: A stateful network functions development platform
 
-A stateful network function could be a firewall, a load balancer, or an IDS. 
+A stateful network function could be a firewall, a load balancer, or an IDS.
 
 ## Architecture
 
@@ -10,26 +10,46 @@ The stellar components are:
 - **Session Manager** has a hash table for tracking sessions. The caller feeds packets to the session manager and may return triggered session events.
 - **Plugin Manager** loads C/Lua plugins and manages per-plugin, per-session context. When the caller feeds an event to the plugin manager, it invokes plugin callbacks.
 - **Protocol Decoders** are libraries that parse and extract information from the packet payload.
-- **Active Queue Management** is queue management algorithm libraries that schedule packets by buffering, forwarding, marking, or dropping. A plugin creates a queue instance and enqueues packets as its needs. 
+- **Active Queue Management** is queue management algorithm libraries that schedule packets by buffering, forwarding, marking, or dropping. A plugin creates a queue instance and enqueues packets as its needs.
   - Question: Who consumes the dequeue events?
 
 ![stellar-high-level-design](./docs/imgs/stellar-high-level-design.svg)
 
 ## Packet IO Library
-```
-struct stellar_packet;
 
-packet_io_loop()
+```cpp
+struct packet;
+
+main()
 {
-  packet_io_device_rx(&rx_pkt)
-  //ingress processing: Tunnel decoding, IP defragmentation
-  session_manager();
-  plugin_manager();
-  //egress processing: AMQ
-  rl_group_id=pkt_get_group_id(rx_pkt);
-  void *raw_pkt=pkt_get_raw(rx_pkt);
-  AMQ_enqueue(group_id[], raw_pkt, pkt_sz);
+	pio = packet_io_create(mode);
+	dev = packet_io_open_device(pio, dev_name);
+	while(1)
+		work_base_loop(dev);
+}
+
+worker_base_loop(dev)
+{
+  struct packet *rx_pkt;
+
+  rx_pkt_num = packet_io_rx(dev, &rx_pkt, 1);
+
+  if(rx_pkt_num > 0)
+  {
+  	//ingress processing: Tunnel decoding, IP defragmentation, Protocol decoding, trigger build in session events
+  	event = session_manager(rx_pkt);
+
+  	//event dispatch
+  	plugin_manager(event);
+
+  	//egress processing: AMQ
+  	rl_group_id[] =pkt_get_group_id(rx_pkt);
+
+        if(rl_group_id[])
+  		AMQ_enqueue(rl_group_id[], rx_pkt);
 
+  	packet_io_tx(&rx_pkt, 1);
+  }
 }
 ```
 
@@ -75,7 +95,9 @@ session_lock(session, plug_id);
 session_unlock(session, plug_id);
 
 ```
+
 Plugin Example
+
 ```
 plugin_entry(session, ctx)
 {