sky2: transmit ring 64 bit conservation

This patch saves elements on transmit ring by only updating the upper
64 bit address when it changes. With many workloads skb's are located
in same region, so it saves space.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/net/sky2.h b/drivers/net/sky2.h
index 65b94c366fbc..feb3204134ed 100644
--- a/drivers/net/sky2.h
+++ b/drivers/net/sky2.h
@@ -2017,6 +2017,7 @@ struct sky2_port {
 
         u16                  tx_pending;
         u16                  tx_last_mss;
+        u32                  tx_last_upper;
         u32                  tx_tcpsum;
 
         struct rx_ring_info  *rx_ring ____cacheline_aligned_in_smp;