ixgbe: enable HW RSC for 82599

This patch enables hardware receive side coalescing for 82599 hardware.
82599 can merge multiple frames from the same TCP/IP flow into a single
structure that can span one ore more descriptors.  The accumulated data is
arranged similar to how jumbo frames are arranged with the exception that
other packets can be interlaced inbetween.  To overcome this issue a next
pointer is included in the written back descriptor which indicates the next
descriptor in the writeback sequence.

This feature sets the NETIF_F_LRO flag and clearing it via the ethtool set
flags operation will also disable hardware RSC.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/net/ixgbe/ixgbe.h b/drivers/net/ixgbe/ixgbe.h
index c26433d14605..4b44a8efac8c 100644
--- a/drivers/net/ixgbe/ixgbe.h
+++ b/drivers/net/ixgbe/ixgbe.h
@@ -147,6 +147,7 @@ struct ixgbe_ring {
 
         u16 work_limit;                /* max work per interrupt */
         u16 rx_buf_len;
+        u64 rsc_count;                 /* stat for coalesced packets */
 };
 
 enum ixgbe_ring_f_enum {
@@ -294,6 +295,8 @@ struct ixgbe_adapter {
 #define IXGBE_FLAG_IN_WATCHDOG_TASK             (u32)(1 << 23)
 #define IXGBE_FLAG_IN_SFP_LINK_TASK             (u32)(1 << 24)
 #define IXGBE_FLAG_IN_SFP_MOD_TASK              (u32)(1 << 25)
+#define IXGBE_FLAG_RSC_CAPABLE                  (u32)(1 << 26)
+#define IXGBE_FLAG_RSC_ENABLED                  (u32)(1 << 27)
 
 /* default to trying for four seconds */
 #define IXGBE_TRY_LINK_TIMEOUT (4 * HZ)
@@ -325,6 +328,7 @@ struct ixgbe_adapter {
         struct timer_list sfp_timer;
         struct work_struct multispeed_fiber_task;
         struct work_struct sfp_config_module_task;
+        u64 rsc_count;
         u32 wol;
         u16 eeprom_version;
 };