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Groups > comp.os.linux.embedded > #371

Re: path of packets through network stack

Cross-posted to 2 groups.

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"Mark" <mark_cruzNOTFORSPAM@hotmail.com> writes:

[...]

> I placed printk in  inet_sendmsg() at net/ipv4/af_inet.c to print
> out the socket protocol name (RAW, UDP etc.) and the address of
> protocol specific sendmsg function which correctly appears to be
> raw_sendmsg() from net/ipv4/raw.c
>
> Now, I'm sending a single packet and observe that I'm getting printk form 
> inet_sendmsg() twice.This puzzles me -- is it normal (has something to do 
> with interrupts etc. ?) or there's something broken in the kernel?

Presumably, the phenomenon you observed is 'normal' and it is
certainly not related to 'interrupts'. Interrupts are used for
controlling/ driving devices. This happens 'below' the network
stack. sendmsg is something which happens at the top of the latter.

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Thread

path of packets through network stack "Mark" <mark_cruzNOTFORSPAM@hotmail.com> - 2012-11-10 12:23 -0500
  Re: path of packets through network stack Rainer Weikusat <rweikusat@mssgmbh.com> - 2012-11-12 16:32 +0000
    Re: path of packets through network stack "Mark" <mark_cruzNOTFORSPAM@hotmail.com> - 2012-11-13 08:31 -0500
      Re: path of packets through network stack Rainer Weikusat <rweikusat@mssgmbh.com> - 2012-11-13 14:29 +0000
    Re: path of packets through network stack "Mark" <mark_cruzNOTFORSPAM@hotmail.com> - 2012-11-14 09:41 -0500
      Re: path of packets through network stack Rainer Weikusat <rweikusat@mssgmbh.com> - 2012-11-15 16:12 +0000
  Re: path of packets through network stack Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2012-11-12 20:22 +0200
    Re: path of packets through network stack "Mark" <mark_cruzNOTFORSPAM@hotmail.com> - 2012-11-13 08:34 -0500
  Re: path of packets through network stack Rick Jones <rick.jones2@hp.com> - 2012-11-13 01:34 +0000

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