Hi,
I recently started looking into the open switch code. I am a novice here
so your guidance is highly appreciated.
I am trying to understand the open Vswitchd code. My query is regarding
the execution of actions of a flow on a packet in the 'userspace'
According to my understanding if a packet dosent match a flow entry in
datapath ,
1. It is queued in userspace by queue_userspace_packets.
2. dpif routine run gets this packet from step 1 and call
handle_upcall routine.
3. handle_upcall routine calls handle_miss_upcall
4. handle_miss_upcall looks for facet matching this packet and if
gets it it calls facet_execute.
5. this facet_execute routine calls vport_send .
6. vport_send simply send the packet to a port.
Now as per above flow I have following queries
1. I did not find any routine which executes action in userspace.
Only action performed is output packet to a port. Enqueue action or
modifly vlan tag actions are not handle in userspace.
2. all modify actions are visible in datapath/actions.c only. That
means all actions are performed in datapath only.
Please let me know how action structure is parsed and executes ?
Amit.
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