Re: question about the receiving ip path

From: Nivedita Singhvi (
Date: Wed Jul 17 2002 - 16:51:47 EST

Quoting Bernd Eckenfels <>:

> For 2.4 see net/core/dev.c:netif_rx(skb) which is called by the
> network driver. This will add it to the queue->input_pkt_queue,
> which is processed by net_rx_action(), which will call the protocol
> families receive handlers eighter directly via the func() method of
> the protcol or by deliver_to_old_cones() which does contain the
> clone. for ip it is net/ipv4/ip_input.c:ip_rcv() which hands it to
> ip_rcv_finish() which distributes it to the ip_local_deliver() for
> local targets which then passes it to ip_local_deliver_finish()
> which calls the ip protocol handler, for example udp_rcv which looks
> up the socket and passes it into that.
> Hope this is nearly right, by reading the source. Note, I am not
> shure with softirq and stuff, which function is running in the irq
> or bottom half mode.

As far as irq/softirq goes:

HW Interrupt Handler:
       device rx interrupt handler routine()

softirq (NET_RX_SOFTIRQ handling (from do_softirq() etc)

process context:


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