netdev - e100 skb allocation

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Message-ID: <b9e8fcbd0906240149g2f2e18f2vcd7dce234c949564@mail.gmail.com>
Date:	Wed, 24 Jun 2009 14:19:48 +0530
From:	Nicholas Van Orton <turanammo@...il.com>
To:	netdev@...r.kernel.org
Subject: e100 skb allocation

Hello,

	For the Intel 8256 Ethernet Controller (e100.c), I notice that at the
time of skb allocation using netdev_alloc_skb() and just before
calling skb_reserve(), rx->skb->head and rx->skb->tail do not point to
the same location. In fact they are already 16bytes apart. After
calling  skb_reserve(), which would add a 2 byte padding, head and
tail would be 18 bytes apart. Is this behaviour correct? Shouldn't the
ethernet header be 14+2 bytes after padding? Why aren't head and tail
at the same location at the beginning?


Thanks and regards,
Nicholas
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