netdev - Re: [PATCH RFX]: napi

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Date:	Tue, 24 Jul 2007 21:29:51 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	rusty@...tcorp.com.au
Cc:	netdev@...r.kernel.org, shemminger@...ux-foundation.org,
	jgarzik@...ox.com, hadi@...erus.ca
Subject: Re: [PATCH RFX]: napi_struct V3

From: Rusty Russell <rusty@...tcorp.com.au>
Date: Wed, 25 Jul 2007 12:33:14 +1000

> Maybe by adding YA state bit?  Hold on, this might get ugly...
> 
> Say netif_rx_schedule_prep() sets the MORE_TODO bit (atomically instead
> of setting __LINK_STATE_RX_SCHED) if it's going to fail, and
> netif_rx_complete() returns 0 if it was set, or 1 if it's OK.  Now
> callers do:
> 
> 	reenable_interrupts();
>         if (rx_pending() || !netif_rx_complete(netdev, napi))
>                 disable_interrupts();

This is an interesting idea, and would work, but the extra atomics
for something that 2 or 3 drivers actually need.... unless I
misunderstand your suggestion?
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