K. Y. Srinivasan says:
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hv_netvsc: Eliminate memory allocation in the send path
The network protocol used to communicate with the host is the remote ndis (rndis)
protocol. We need to decorate each outgoing packet with a rndis header and
additional rndis state (rndis per-packet state). To manage this state, we
currently allocate memory in the transmit path. Eliminate this allocation by
requesting additional head room in the skb.
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Signed-off-by: David S. Miller <davem@davemloft.net>