net: add netdev_txq_bql_{enqueue, complete}_prefetchw() helpers
Add two helpers so that drivers do not have to care of BQL being available or not. Signed-off-by: NEric Dumazet <edumazet@google.com> Reported-by: NJim Davis <jim.epost@gmail.com> Fixes: 29d40c90 ("net/mlx4_en: Use prefetch in tx path") Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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