netdev - Re: skb's & hw buffer mgmt

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Message-Id: <20090319.202040.227321807.davem@davemloft.net>
Date:	Thu, 19 Mar 2009 20:20:40 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	galak@...nel.crashing.org
Cc:	netdev@...r.kernel.org
Subject: Re: skb's & hw buffer mgmt

From: Kumar Gala <galak@...nel.crashing.org>
Date: Thu, 19 Mar 2009 21:55:18 -0500

> It appears that you allocate a bunch of pages, seed the HW buffer
> manager.  As you receive packets you setup the skb via
> niu_process_rx_pkt()/niu_rx_skb_append().  I'm a little confused
> about how the non-paged data in the skb itself is actually used.
> How does skb->data actually point to anything meaningful?

It's empty except for the ethernet header which is copied from
the paged data area with the lines:

	skb_reserve(skb, NET_IP_ALIGN);
	__pskb_pull_tail(skb, min(len, NIU_RXPULL_MAX));
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