xen/netback: add fraglist support for to-guest rx
This allows full 64K skbuffs (with 1500 mtu ethernet, composed of 45 fragments) to be handled by netback for to-guest rx. Signed-off-by: NRoss Lagerwall <ross.lagerwall@citrix.com> [re-based] Signed-off-by: NPaul Durrant <paul.durrant@citrix.com> Reviewed-by: NDavid Vrabel <david.vrabel@citrix.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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