net: microchip: sparx5: Reset VCAP counter for new rules

When a rule counter is external to the VCAP such as the Sparx5 IS2 counters
are, then this counter must be reset when a new rule is created.
Signed-off-by: NSteen Hegelund <steen.hegelund@microchip.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/microchip/vcap/vcap_api.c

@@ -1808,6 +1808,7 @@ int vcap_add_rule(struct vcap_rule *rule)
 {
 	struct vcap_rule_internal *ri = to_intrule(rule);
 	struct vcap_rule_move move = {0};
+	struct vcap_counter ctr = {0};
 	int ret;
 
 	ret = vcap_api_check(ri->vctrl);
@@ -1831,8 +1832,12 @@ int vcap_add_rule(struct vcap_rule *rule)
 	}
 
 	ret = vcap_write_rule(ri);
-	if (ret)
+	if (ret) {
 		pr_err("%s:%d: rule write error: %d\n", __func__, __LINE__, ret);
+		goto out;
+	}
+	/* Set the counter to zero */
+	ret = vcap_write_counter(ri, &ctr);
 out:
 	mutex_unlock(&ri->admin->lock);
 	return ret;

drivers/net/ethernet/microchip/vcap/vcap_api_kunit.c

@@ -1343,8 +1343,8 @@ static void vcap_api_encode_rule_test(struct kunit *test)
 	u32 port_mask_rng_mask = 0x0f;
 	u32 igr_port_mask_value = 0xffabcd01;
 	u32 igr_port_mask_mask = ~0;
-	/* counter is not written yet, so it is not in expwriteaddr */
-	u32 expwriteaddr[] = {792, 793, 794, 795, 796, 797, 0};
+	/* counter is written as the last operation */
+	u32 expwriteaddr[] = {792, 793, 794, 795, 796, 797, 792};
 	int idx;
 
 	vcap_test_api_init(&is2_admin);