Xen devel - Jun 2008 - event notify during netfront and netback setup in Xen3.1

hi
In Xen3.1 source
when setup
  netfront: when netback changed XenBusState to InitWait, fuction
network_connect() called
            in network_connect(),notify_remote_via_irq() was called, which gives
netback a kick.
            then netfront changed Xenbusstate to Connected

  but at the same time, netback has not bind its eventchannel to netfront
domain''s event?
  so how could this happen, when netback receive event from netfront domain? 

ps:
The event bind happens when netfront Connected, netback calls connect()
-->connect_rings() -->netif_map() . And later changed XenbusState to
Connected.
After all Connected, netback and netfront setup over and begin tx and rx in
common.



Zang Hongyong
zanghongyong@ncic.ac.cn
2008-06-13


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> hi
>  In Xen3.1 source
>  when setup
>   netfront: when netback changed XenBusState to InitWait, fuction
network_connect() called
>             in network_connect(),notify_remote_via_irq() was called, which
gives netback a kick.
>             then netfront changed Xenbusstate to Connected
>
>   but at the same time, netback has not bind its eventchannel to netfront
domain''s event?
>   so how could this happen, when netback receive event from netfront
domain?
Netfront allocates an unbound event channel in responce to the backend
entering InitWait state (network_connect() -> talk_to_backend() ->
setup_device() -> bind_listening_port_to_irqhandler() ->
bind_listening_port_to_irq() -> EVTCHNOP_alloc_unbound). Once the
channel is allocated, the frontend can queue events on it, even before
backend binds it. This happens later on, in responce to netfront
entering Connected state (bind_interdomain_evtchn_to_irqhandler() in
netif_map()).

Hope this helps
Gr(z)egor(z)

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