AW: [mpls-linux-general] when mpls_recv

[Georg K. <gk...@gi...>]

Hi roro,

>     I am reading mpls-linux source code, but I encoutered problems.
>     is mpls_rcv invoked when a packet reach ingress LSR? If so, which 
> sentence invoke it ?

The mpls_init function registers the Packet Type ETH_P_MPLS_UC to be received 
by the function mpls_rcv. So mpls_rcv is called almost immediately after the
device driver calls netif_rx(). You won't find any mpls_rcv reference in the 
kernel, instead the registration works with the function dev_add_pack();

> And where is mpls_send invoked?

mpls_send is called by mpls_output2, is called by mpls_output_shim is called by
mpls_output which is stored along with the next hop info of the FIB. (see 
mpls_make_dst())

>     Can you tell me the detailed flow when a packet reach and leave ? 
> It will be appreciated.
>     Thanks a lot 

Hope this helps for reading further ...

Georg