net: microchip: sparx5: Find VCAP lookup from chain id

Add a helper function that finds the lookup index in a VCAP instance from
the chain id.

Signed-off-by: Steen Hegelund <steen.hegelund@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/microchip/vcap/vcap_api.c b/drivers/net/ethernet/microchip/vcap/vcap_api.c
index ace2582..d5b62e4 100644 (file)
--- a/drivers/net/ethernet/microchip/vcap/vcap_api.c
+++ b/drivers/net/ethernet/microchip/vcap/vcap_api.c
@@ -644,6 +644,23 @@ static int vcap_write_rule(struct vcap_rule_internal *ri)
        return 0;
 }
 
+/* Convert a chain id to a VCAP lookup index */
+int vcap_chain_id_to_lookup(struct vcap_admin *admin, int cur_cid)
+{
+       int lookup_first = admin->vinst * admin->lookups_per_instance;
+       int lookup_last = lookup_first + admin->lookups_per_instance;
+       int cid_next = admin->first_cid + VCAP_CID_LOOKUP_SIZE;
+       int cid = admin->first_cid;
+       int lookup;
+
+       for (lookup = lookup_first; lookup < lookup_last; ++lookup,
+            cid += VCAP_CID_LOOKUP_SIZE, cid_next += VCAP_CID_LOOKUP_SIZE)
+               if (cur_cid >= cid && cur_cid < cid_next)
+                       return lookup;
+       return 0;
+}
+EXPORT_SYMBOL_GPL(vcap_chain_id_to_lookup);
+
 /* Lookup a vcap instance using chain id */
 struct vcap_admin *vcap_find_admin(struct vcap_control *vctrl, int cid)
 {

diff --git a/drivers/net/ethernet/microchip/vcap/vcap_api_client.h b/drivers/net/ethernet/microchip/vcap/vcap_api_client.h
index 5773954..7d9a227 100644 (file)
--- a/drivers/net/ethernet/microchip/vcap/vcap_api_client.h
+++ b/drivers/net/ethernet/microchip/vcap/vcap_api_client.h
@@ -184,6 +184,8 @@ int vcap_rule_add_action_u32(struct vcap_rule *rule,
                             enum vcap_action_field action, u32 value);
 
 /* VCAP lookup operations */
+/* Convert a chain id to a VCAP lookup index */
+int vcap_chain_id_to_lookup(struct vcap_admin *admin, int cur_cid);
 /* Lookup a vcap instance using chain id */
 struct vcap_admin *vcap_find_admin(struct vcap_control *vctrl, int cid);
 /* Find information on a key field in a rule */