net/mlx5e: Add TC drop and mirred/redirect action parsing for SRIOV offloads

Add the setup code that parses the TC actions needed to support offloading drop
and mirred/redirect for SRIOV e-switch. We can redirect between two devices if
they belong to the same HW switch, compare the switchdev HW ID attribute to
enforce that.

Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index 57b76f7..9a66441 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -37,8 +37,11 @@
 #include <linux/mlx5/fs.h>
 #include <linux/mlx5/device.h>
 #include <linux/rhashtable.h>
+#include <net/switchdev.h>
+#include <net/tc_act/tc_mirred.h>
 #include "en.h"
 #include "en_tc.h"
+#include "eswitch.h"
 
 struct mlx5e_tc_flow {
        struct rhash_head       node;
@@ -339,6 +342,56 @@ static int parse_tc_nic_actions(struct mlx5e_priv *priv, struct tcf_exts *exts,
        return 0;
 }
 
+static int parse_tc_fdb_actions(struct mlx5e_priv *priv, struct tcf_exts *exts,
+                               u32 *action, u32 *dest_vport)
+{
+       const struct tc_action *a;
+
+       if (tc_no_actions(exts))
+               return -EINVAL;
+
+       *action = 0;
+
+       tc_for_each_action(a, exts) {
+               /* Only support a single action per rule */
+               if (*action)
+                       return -EINVAL;
+
+               if (is_tcf_gact_shot(a)) {
+                       *action = MLX5_FLOW_CONTEXT_ACTION_DROP |
+                                 MLX5_FLOW_CONTEXT_ACTION_COUNT;
+                       continue;
+               }
+
+               if (is_tcf_mirred_redirect(a)) {
+                       int ifindex = tcf_mirred_ifindex(a);
+                       struct net_device *out_dev;
+                       struct mlx5e_priv *out_priv;
+                       struct mlx5_eswitch_rep *out_rep;
+
+                       out_dev = __dev_get_by_index(dev_net(priv->netdev), ifindex);
+
+                       if (!switchdev_port_same_parent_id(priv->netdev, out_dev)) {
+                               pr_err("devices %s %s not on same switch HW, can't offload forwarding\n",
+                                      priv->netdev->name, out_dev->name);
+                               return -EINVAL;
+                       }
+
+                       out_priv = netdev_priv(out_dev);
+                       out_rep  = out_priv->ppriv;
+                       if (out_rep->vport == 0)
+                               *dest_vport = FDB_UPLINK_VPORT;
+                       else
+                               *dest_vport = out_rep->vport;
+                       *action = MLX5_FLOW_CONTEXT_ACTION_FWD_DEST;
+                       continue;
+               }
+
+               return -EINVAL;
+       }
+       return 0;
+}
+
 int mlx5e_configure_flower(struct mlx5e_priv *priv, __be16 protocol,
                           struct tc_cls_flower_offload *f)
 {