igb: add DCA support

Add DCA support in the similar method that it was added to the ixgbe
driver recently. DCA allows the network device to put data in the
CPU cache and notify the chipset of that event. This reduces cache
misses during receives.

Signed-off-by: Jeb Cramer <cramerj@intel.com>
Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>
Signed-off-by: Shannon Nelson <shannon.nelson@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/net/igb/igb.h b/drivers/net/igb/igb.h
index 5915efccbcab..d4a042344728 100644
--- a/drivers/net/igb/igb.h
+++ b/drivers/net/igb/igb.h
@@ -271,7 +271,9 @@ struct igb_adapter {
         /* to not mess up cache alignment, always add to the bottom */
         unsigned long state;
         unsigned int msi_enabled;
-
+#ifdef CONFIG_DCA
+        unsigned int dca_enabled;
+#endif
         u32 eeprom_wol;
 
         /* for ioport free */