netdev - Re: [RFC,PATCH] loopback: calls netif_receive_skb() instead of netif

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Message-ID: <47F086DE.20306@cosmosbay.com>
Date:	Mon, 31 Mar 2008 08:38:22 +0200
From:	Eric Dumazet <dada1@...mosbay.com>
To:	David Miller <davem@...emloft.net>
CC:	netdev@...r.kernel.org
Subject: Re: [RFC,PATCH] loopback: calls netif_receive_skb() instead of netif_rx()

David Miller a écrit :
> From: Eric Dumazet <dada1@...mosbay.com>
> Date: Sat, 29 Mar 2008 09:18:03 +0100
> 
>> BTW, can loopback_xmit() be called on an interrupt stack ?
> 
> Absolutely, softirq processes TCP data, ACK goes out in
> softirq context.

yes, ICMP messages (if any are sent) too.

> 
> Softirqs run on interrupt stacks just as hardirqs do.
> 

Well, it depends.

Not on x86_32 with 8K stacks, and some other arches.
do_softirq() can use the underlying stack too.

Thank you
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