igb: reduce cache misses on tx cleanup

This patch reduces the number of skb cache misses in the
clean_tx_irq path, and results in an overall increase
in tx packet throughput.

Signed-off-by: Nicholas Nunley <nicholasx.d.nunley@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/net/igb/igb.h b/drivers/net/igb/igb.h
index 735ede9c7d75..6e63d9a7fc75 100644
--- a/drivers/net/igb/igb.h
+++ b/drivers/net/igb/igb.h
@@ -141,8 +141,10 @@ struct igb_buffer {
                         unsigned long time_stamp;
                         u16 length;
                         u16 next_to_watch;
-                        u16 mapped_as_page;
+                        unsigned int bytecount;
                         u16 gso_segs;
+                        union skb_shared_tx shtx;
+                        u8 mapped_as_page;
                 };
                 /* RX */
                 struct {