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, 23 insertions, 1 deletions

diff --git a/drivers/net/ixgbe/ixgbe_ethtool.c b/drivers/net/ixgbe/ixgbe_ethtool.c
index a499b6b31ca..d822c92058c 100644
--- a/drivers/net/ixgbe/ixgbe_ethtool.c
+++ b/drivers/net/ixgbe/ixgbe_ethtool.c
@@ -67,6 +67,7 @@ static struct ixgbe_stats ixgbe_gstrings_stats[] = {
         {"rx_over_errors", IXGBE_STAT(net_stats.rx_over_errors)},
         {"rx_crc_errors", IXGBE_STAT(net_stats.rx_crc_errors)},
         {"rx_frame_errors", IXGBE_STAT(net_stats.rx_frame_errors)},
+        {"hw_rsc_count", IXGBE_STAT(rsc_count)},
         {"rx_fifo_errors", IXGBE_STAT(net_stats.rx_fifo_errors)},
         {"rx_missed_errors", IXGBE_STAT(net_stats.rx_missed_errors)},
         {"tx_aborted_errors", IXGBE_STAT(net_stats.tx_aborted_errors)},
@@ -1127,6 +1128,27 @@ static int ixgbe_set_coalesce(struct net_device *netdev,
         return 0;
 }
 
+static int ixgbe_set_flags(struct net_device *netdev, u32 data)
+{
+        struct ixgbe_adapter *adapter = netdev_priv(netdev);
+
+        ethtool_op_set_flags(netdev, data);
+
+        if (!(adapter->flags & IXGBE_FLAG_RSC_CAPABLE))
+                return 0;
+
+        /* if state changes we need to update adapter->flags and reset */
+        if ((!!(data & ETH_FLAG_LRO)) != 
+            (!!(adapter->flags & IXGBE_FLAG_RSC_ENABLED))) {
+                adapter->flags ^= IXGBE_FLAG_RSC_ENABLED;
+                if (netif_running(netdev))
+                        ixgbe_reinit_locked(adapter);
+                else
+                        ixgbe_reset(adapter);
+        }
+        return 0;
+
+}
 
 static const struct ethtool_ops ixgbe_ethtool_ops = {
         .get_settings           = ixgbe_get_settings,
@@ -1161,7 +1183,7 @@ static const struct ethtool_ops ixgbe_ethtool_ops = {
         .get_coalesce           = ixgbe_get_coalesce,
         .set_coalesce           = ixgbe_set_coalesce,
         .get_flags              = ethtool_op_get_flags,
-        .set_flags              = ethtool_op_set_flags,
+        .set_flags              = ixgbe_set_flags,
 };
 
 void ixgbe_set_ethtool_ops(struct net_device *netdev)