netdev - Re: [PATCH 3/8] net: Add Generic Receive Offload infrastructure

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Message-ID: <20081216020432.GA6454@gondor.apana.org.au>
Date:	Tue, 16 Dec 2008 13:04:32 +1100
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	David Miller <davem@...emloft.net>
Cc:	paulmck@...ux.vnet.ibm.com, netdev@...r.kernel.org,
	johnpol@....mipt.ru, bhutchings@...arflare.com
Subject: Re: [PATCH 3/8] net: Add Generic Receive Offload infrastructure

On Mon, Dec 15, 2008 at 03:39:20PM -0800, David Miller wrote:
> From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
>
> > Presumably ptype_base[] is a static array rather than a dynamically
> > allocated array that is resized under RCU protection, right?  Otherwise,
> > you could get in trouble if the above raced with the resize operation due
> > to the fact that you are outside of the RCU read-side critical section.
> 
> Yes, and we've been using RCU this way for this table for quite
> some time.  From net/core/dev.c:
> 
> #define PTYPE_HASH_SIZE	(16)
> #define PTYPE_HASH_MASK	(PTYPE_HASH_SIZE - 1)
> 
> static DEFINE_SPINLOCK(ptype_lock);
> static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
> static struct list_head ptype_all __read_mostly;	/* Taps */

Thanks for confirming.  Yes unless there is a sudden surge of
new Ethernet protocols we shouldn't need to resize this ever :)

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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