s390/qeth: indicate contiguous TX buffer elements
The TX path usually maps the full content of a page into a buffer element. But there's specific skb layouts (ie. linearized TSO skbs) where the HW header (1) requires a separate buffer element, and (2) is page-contiguous with the packet data that's mapped into the next buffer element. Flag such buffer elements accordingly, so that HW can optimize its data access for them. Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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