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Update Architecture.md [ci skip]
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‎Architecture.md‎

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@@ -46,7 +46,7 @@ TupleNet的dataplane使用的是openvswitch（版本大于等于2.8.0）来实
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## Implementation of control-plane
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### python and pyDatalog
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### Python and pyDatalog
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TupleNet的绝大部分代码是python书写的，因为python灵活，易于排查问题的特点，非常适合开发控制平面，能快速迭代出新的网络功能。虽然control-plane使用解析性动态语言后性能不如编译型程序快，但是control-plane并不会影响datapath的效率，不会引入数据包的转发耗时。所以我们认为使用python 动态语言来实现control-plane是非常合适的。
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在虚拟网络中，网络报文的行为需要实时根据目前的虚拟网络网络拓扑和物理网络拓扑来决定，而虚拟网络拓扑在实际使用中是易变的，且变化是频繁的。我们需要一种方便的工具能快速帮我们解析实时网络状态的迁移，因为这种状态的变更是完全stateless的，所以我们采用Datalog这种古老的语言帮助我们屏蔽网络拓扑变化带来的编程复杂性。PyDatalog是Datalog在python的一种实现，它语法形式类似Datalog。我们编写好地pyDatalog规则后输入网络拓扑数据就可以用pyDatalog 引擎动态计算出目前需要插入和删除的ovs-flow。pyDatalog是一个python lib库，可以有机地和python结合起来，使得python既有命令式编程能能力，同时也具备声明式编程能力。
@@ -70,62 +70,61 @@ TupleNet 没有使用ovs python库来直接和ovsdb来进行通信，也没有
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为了灵活处理各种类型的数据报文，我们为virtualswitch，virtualrouter建立了相应的数据报文处理pipeline，所有数据报文都需要经过pipeline的处理。
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```
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PORT +--------------------------------------------------------------------------------------------------------------------------+
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PORT +----------------------------------------------------------------------------------------------------------------------<---+
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+ | |
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| | +----------------------------------------------------+ |
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| | | | |
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+---------------v----------v----+ | | |
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| LSP_TRACE_INGRESS_IN | PORT | +---------------v---------------+ +-------------------------------+
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+-------------------------------+ ^ | | LRP_TRACE_INGRESS_IN | | LRP_TRACE_EGRESS_OUT |
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| | | +-------------------------------+ +-------------------------------+
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v | | | ^
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| | v |
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+-------------------------------+ +-------------------------------+ |
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| LSP_INGRESS_ARP_CONTROLLER | | LSP_EGRESS_PUSHOUT | +-------------------------------+ +-------------------------------+
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+-------------------------------+ +-------------------------------+ | LRP_INGRESS_PKT_RESPONSE | | LRP_EGRESS_FORWARD_PACKET |
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| ^ +-------------------------------+ +-------------------------------+
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v | | ^
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| v |
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+-------------------------------+ +-------------------------------+ |
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| LSP_INGRESS_ARP_RESPONSE | | LSP_EGRESS_PUSHOUT | +-------------------------------+ +-------------------------------+
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+-------------------------------+ +-------------------------------+ | LRP_INGRESS_DROP_UNEXPECT | | LRP_EGRESS_UPDATE_ETH_DST |
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| ^ +-------------------------------+ +-------------------------------+
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v | | ^
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| v |
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| | +---------------------------------------------------+ |
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| | | | |
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+---------------v----------v----+ | | |
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| LSP_TRACE_INGRESS_IN | PORT | +---------------v---------------+ +-------------------------------+
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+-------------------------------+ ^ | | LRP_TRACE_INGRESS_IN | | LRP_TRACE_EGRESS_OUT |
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| | | +-------------------------------+ +-------------------------------+
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v | | | ^
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| | v |
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+-------------------------------+ | | |
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| LSP_INGRESS_ARP_CONTROLLER | | | +-------------------------------+ +-------------------------------+
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+-------------------------------+ | | | LRP_INGRESS_PKT_RESPONSE | | LRP_EGRESS_FORWARD_PACKET |
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| | | +-------------------------------+ +-------------------------------+
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v | | | ^
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| | v |
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+-------------------------------+ +-------------------------------+ |
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| LSP_INGRESS_LOOKUP_DST_PORT | | LSP_EGRESS_FORWARD_PACKET | +-------------------------------+ +-------------------------------+
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+-------------------------------+ +-------------------------------+ | LRP_INGRESS_UNSNAT_STAGE1 | | LRP_EGRESS_SNAT_STAGE2 |
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| ^ +-------------------------------+ +-------------------------------+
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v | | ^
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| v |
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+-------------------------------+ +-------------------------------+ |
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| LSP_INGRESS_OUTPUT_DST_PORT | | LSP_EGRESS_JUDGE_LOOPBACK | +-------------------------------+ +-------------------------------+
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+-------------------------------+ +-------------------------------+ | LRP_INGRESS_UNSNAT_STAGE2 | | LRP_EGRESS_SNAT_STAGE1 |
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| ^ +-------------------------------+ +-------------------------------+
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v | | ^
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| v |
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+-------------------------------+ +-------------------------------+ |
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| LSP_TRACE_INGRESS_OUT | | LSP_TRACE_EGRESS_IN | +-------------------------------+ +-------------------------------+
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+-------------------------------+ +-------------------------------+ | LRP_INGRESS_DNAT_STAGE1 | | LRP_EGRESS_UNDNAT_STAGE2 |
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| ^ +-------------------------------+ +-------------------------------+
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| | | ^
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| | v |
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| | |
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| | +-------------------------------+ +-------------------------------+
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| | | LRP_INGRESS_DNAT_STAGE2 | | LRP_EGRESS_UNDNAT_STAGE1 |
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+--------------------------------------------+ +-------------------------------+ +-------------------------------+
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| ^
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| LSP_INGRESS_ARP_RESPONSE | | LSP_PUSHOUT_PACKET | +-------------------------------+ +-------------------------------+
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+-------------------------------+ +-------------------------------+ | LRP_INGRESS_DROP_UNEXPECT | |TABLE_LRP_EGRESS_HANDLE_UNK_PKT|
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| ^ +-------------------------------+ +---------------^---------------+
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v | | |
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+-------------------------------+ | v |
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| LSP_UNTUNNEL_DELIVER | +-------------------------------+ +-------------------------------+
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+-------------------------------+ | LSP_EGRESS_FORWARD_PACKET | +-------------------------------+ | LRP_EGRESS_UPDATE_ETH_DST |
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| +-------------------------------+ | LRP_INGRESS_UNSNAT_STAGE1 | +-------------------------------+
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v ^ +-------------------------------+ ^
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+-------------------------------+ | | |
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| LSP_INGRESS_LOOKUP_DST_PORT | | v |
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+-------------------------------+ +-------------------------------+ +-------------------------------+
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| | LSP_EGRESS_JUDGE_LOOPBACK | +-------------------------------+ | LRP_EGRESS_SNAT_STAGE2 |
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v +-------------------------------+ | LRP_INGRESS_UNSNAT_STAGE2 | +-------------------------------+
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^ +-------------------------------+ ^
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+-------------------------------+ | | |
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| LSP_INGRESS_OUTPUT_DST_PORT | | v |
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+-------------------------------+ +-------------------------------+ +-------------------------------+
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| | LSP_TRACE_EGRESS_IN | +-------------------------------+ | LRP_EGRESS_SNAT_STAGE1 |
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v +-------------------------------+ | LRP_INGRESS_DNAT_STAGE1 | +-------------------------------+
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| ^ +-------------------------------+ ^
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+-------------------------------+ | | |
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| LSP_TRACE_INGRESS_OUT | | v |
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+-------------------------------+ | +-------------------------------+
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| | +-------------------------------+ | LRP_EGRESS_UNDNAT_STAGE2 |
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| | | LRP_INGRESS_DNAT_STAGE2 | +-------------------------------+
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+--------------------------------------------+ +-------------------------------+ ^
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| |
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v |
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|
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+-------------------------------+ +-------------------------------+
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| LRP_INGRESS_IP_ROUTE | | LRP_TRACE_EGRESS_IN |
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+-------------------------------+ +-------------------------------+
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| ^
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+-------------------------------+
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+-------------------------------+ | LRP_EGRESS_UNDNAT_STAGE1 |
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| LRP_INGRESS_IP_ROUTE | +-------------------------------+
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+-------------------------------+ ^
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| |
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v |
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|
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+-------------------------------+ |
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| LRP_INGRESS_ECMP | |
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+-------------------------------+
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+-------------------------------+ | LRP_TRACE_EGRESS_IN |
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| LRP_INGRESS_ECMP | +-------------------------------+
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+-------------------------------+ |
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+------------------------------------+
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```
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### traffic redirecting
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### Traffic redirecting
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Traffic redirecting是TupleNet的一个重要特性。TupleNet默认启动时候会使用ondemand方式来生成ovs-flow，也就是说当TupleNet收到traffic中的第一个网络报文时候才会生成相应的ovs-flow。这样做的好处是能最大节约TupleNet所在机器的CPU，只计算真正需要的ovs-flow，但是这种方式同时也会带来traffic中首包被丢弃或产生严重延迟的问题。但是如果采用全量计算ovs-flow就会占用大量的CPU资源生成无用的ovs-flow，而且每次网络拓扑的微小变化都要通过pyDatalog来计算。为了解决这个问题，我们引入了redirecting功能。
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Redirecting主要功能场景有两块：

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