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The new BCM5760X chips will return the timestamp of TX packets in a
new completion.  Add logic in __bnxt_poll_work() to handle this
completion type to retrieve the timestamp.  This feature eliminates
the limit on the number of in-flight PTP TX packets.
Reviewed-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>