net/mlx5e: Introduce tc offload support

Extend ndo_setup_tc() to support ingress tc offloading. Will be used by
later patches to offload tc flower filter.

Feature is off by default and could be enabled by issuing:
 # ethtool  -K eth0 hw-tc-offload on

Offloads flow table is dynamically created when first filter is
added.
Rules are saved in a hash table that is maintained by the consumer (for
example - the flower offload in the next patch).
When last filter is removed and no filters exist in the hash table, the
offload flow table is destroyed.

Signed-off-by: Amir Vadai <amir@vadai.me>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 37 insertions, 1 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index f1ebe065de0d..e6210485e128 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -30,9 +30,12 @@
  * SOFTWARE.
  */
 
+#include <net/tc_act/tc_gact.h>
+#include <net/pkt_cls.h>
 #include <linux/mlx5/fs.h>
 #include <net/vxlan.h>
 #include "en.h"
+#include "en_tc.h"
 #include "eswitch.h"
 #include "vxlan.h"
 
@@ -1883,6 +1886,17 @@ static int mlx5e_setup_tc(struct net_device *netdev, u8 tc)
 static int mlx5e_ndo_setup_tc(struct net_device *dev, u32 handle,
 			      __be16 proto, struct tc_to_netdev *tc)
 {
+	struct mlx5e_priv *priv = netdev_priv(dev);
+
+	if (TC_H_MAJ(handle) != TC_H_MAJ(TC_H_INGRESS))
+		goto mqprio;
+
+	switch (tc->type) {
+	default:
+		return -EOPNOTSUPP;
+	}
+
+mqprio:
 	if (tc->type != TC_SETUP_MQPRIO)
 		return -EINVAL;
 
@@ -1968,6 +1982,13 @@ static int mlx5e_set_features(struct net_device *netdev,
 			mlx5e_disable_vlan_filter(priv);
 	}
 
+	if ((changes & NETIF_F_HW_TC) && !(features & NETIF_F_HW_TC) &&
+	    mlx5e_tc_num_filters(priv)) {
+		netdev_err(netdev,
+			   "Active offloaded tc filters, can't turn hw_tc_offload off\n");
+		return -EINVAL;
+	}
+
 	return err;
 }
 
@@ -2375,6 +2396,13 @@ static void mlx5e_build_netdev(struct net_device *netdev)
 	if (!priv->params.lro_en)
 		netdev->features  &= ~NETIF_F_LRO;
 
+#define FT_CAP(f) MLX5_CAP_FLOWTABLE(mdev, flow_table_properties_nic_receive.f)
+	if (FT_CAP(flow_modify_en) &&
+	    FT_CAP(modify_root) &&
+	    FT_CAP(identified_miss_table_mode) &&
+	    FT_CAP(flow_table_modify))
+		priv->netdev->hw_features      |= NETIF_F_HW_TC;
+
 	netdev->features         |= NETIF_F_HIGHDMA;
 
 	netdev->priv_flags       |= IFF_UNICAST_FLT;
@@ -2496,6 +2524,10 @@ static void *mlx5e_create_netdev(struct mlx5_core_dev *mdev)
 
 	mlx5e_vxlan_init(priv);
 
+	err = mlx5e_tc_init(priv);
+	if (err)
+		goto err_destroy_flow_tables;
+
 #ifdef CONFIG_MLX5_CORE_EN_DCB
 	mlx5e_dcbnl_ieee_setets_core(priv, &priv->params.ets);
 #endif
@@ -2503,7 +2535,7 @@ static void *mlx5e_create_netdev(struct mlx5_core_dev *mdev)
 	err = register_netdev(netdev);
 	if (err) {
 		mlx5_core_err(mdev, "register_netdev failed, %d\n", err);
-		goto err_destroy_flow_tables;
+		goto err_tc_cleanup;
 	}
 
 	if (mlx5e_vxlan_allowed(mdev))
@@ -2514,6 +2546,9 @@ static void *mlx5e_create_netdev(struct mlx5_core_dev *mdev)
 
 	return priv;
 
+err_tc_cleanup:
+	mlx5e_tc_cleanup(priv);
+
 err_destroy_flow_tables:
 	mlx5e_destroy_flow_tables(priv);
 
@@ -2561,6 +2596,7 @@ static void mlx5e_destroy_netdev(struct mlx5_core_dev *mdev, void *vpriv)
 	mlx5e_disable_async_events(priv);
 	flush_scheduled_work();
 	unregister_netdev(netdev);
+	mlx5e_tc_cleanup(priv);
 	mlx5e_vxlan_cleanup(priv);
 	mlx5e_destroy_flow_tables(priv);
 	mlx5e_destroy_tirs(priv);