Add flower filter packet statistics. This will just read the TCAM
counter of the rule, which mention how many packages were hit by this
rule.

Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
---
v1->v2:
- use {} to initialize count instead of memset
---
 .../microchip/lan966x/lan966x_tc_flower.c     | 20 +++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_tc_flower.c b/drivers/net/ethernet/microchip/lan966x/lan966x_tc_flower.c
index 88c655d6318fa..1e464bb804ae0 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_tc_flower.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_tc_flower.c
@@ -234,6 +234,24 @@ static int lan966x_tc_flower_del(struct lan966x_port *port,
 	return err;
 }
 
+static int lan966x_tc_flower_stats(struct lan966x_port *port,
+				   struct flow_cls_offload *f,
+				   struct vcap_admin *admin)
+{
+	struct vcap_counter count = {};
+	int err;
+
+	err = vcap_get_rule_count_by_cookie(port->lan966x->vcap_ctrl,
+					    &count, f->cookie);
+	if (err)
+		return err;
+
+	flow_stats_update(&f->stats, 0x0, count.value, 0, 0,
+			  FLOW_ACTION_HW_STATS_IMMEDIATE);
+
+	return err;
+}
+
 int lan966x_tc_flower(struct lan966x_port *port,
 		      struct flow_cls_offload *f,
 		      bool ingress)
@@ -252,6 +270,8 @@ int lan966x_tc_flower(struct lan966x_port *port,
 		return lan966x_tc_flower_add(port, f, admin, ingress);
 	case FLOW_CLS_DESTROY:
 		return lan966x_tc_flower_del(port, f, admin);
+	case FLOW_CLS_STATS:
+		return lan966x_tc_flower_stats(port, f, admin);
 	default:
 		return -EOPNOTSUPP;
 	}
-- 
2.38.0

Hello:

This patch was applied to netdev/net-next.git (master)
by David S. Miller <davem@davemloft.net>:

On Tue, 7 Feb 2023 11:35:49 +0100 you wrote:
> Add flower filter packet statistics. This will just read the TCAM
> counter of the rule, which mention how many packages were hit by this
> rule.
> 
> Reviewed-by: Simon Horman <simon.horman@corigine.com>
> Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
> 
> [...]

Here is the summary with links:
  - [net-next,v2] net: lan966x: Add support for TC flower filter statistics
    https://git.kernel.org/netdev/net-next/c/9ed138ff3767

You are awesome, thank you!
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