tg3: Consider rx_std_prod_idx a hw mailbox
This patch changes how the code uses the rx_std_prod_idx member. In the
following patch, the code will be changed so that it will act just like
a hardware mailbox. This patch prepares the code so that memory barriers
can be more easily inserted.
Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Reviewed-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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