net: microchip: sparx5: Adding TC goto action and action checking

Add support for a goto action and ensure that a HW offloaded TC flower
filter has a valid goto action and that pass and trap actions are not both
used in the same filter.

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

2 files changed, 38 insertions, 0 deletions

diff --git a/drivers/net/ethernet/microchip/vcap/vcap_api.c b/drivers/net/ethernet/microchip/vcap/vcap_api.c
index d5b62e43d83f..0dd9637933b2 100644
--- a/drivers/net/ethernet/microchip/vcap/vcap_api.c
+++ b/drivers/net/ethernet/microchip/vcap/vcap_api.c
@@ -677,6 +677,42 @@ struct vcap_admin *vcap_find_admin(struct vcap_control *vctrl, int cid)
 }
 EXPORT_SYMBOL_GPL(vcap_find_admin);
 
+/* Is the next chain id in the following lookup, possible in another VCAP */
+bool vcap_is_next_lookup(struct vcap_control *vctrl, int cur_cid, int next_cid)
+{
+	struct vcap_admin *admin, *next_admin;
+	int lookup, next_lookup;
+
+	/* The offset must be at least one lookup */
+	if (next_cid < cur_cid + VCAP_CID_LOOKUP_SIZE)
+		return false;
+
+	if (vcap_api_check(vctrl))
+		return false;
+
+	admin = vcap_find_admin(vctrl, cur_cid);
+	if (!admin)
+		return false;
+
+	/* If no VCAP contains the next chain, the next chain must be beyond
+	 * the last chain in the current VCAP
+	 */
+	next_admin = vcap_find_admin(vctrl, next_cid);
+	if (!next_admin)
+		return next_cid > admin->last_cid;
+
+	lookup = vcap_chain_id_to_lookup(admin, cur_cid);
+	next_lookup = vcap_chain_id_to_lookup(next_admin, next_cid);
+
+	/* Next lookup must be the following lookup */
+	if (admin == next_admin || admin->vtype == next_admin->vtype)
+		return next_lookup == lookup + 1;
+
+	/* Must be the first lookup in the next VCAP instance */
+	return next_lookup == 0;
+}
+EXPORT_SYMBOL_GPL(vcap_is_next_lookup);
+
 /* Check if there is room for a new rule */
 static int vcap_rule_space(struct vcap_admin *admin, int size)
 {
diff --git a/drivers/net/ethernet/microchip/vcap/vcap_api_client.h b/drivers/net/ethernet/microchip/vcap/vcap_api_client.h
index 7d9a227ef834..5cecb12edec2 100644
--- a/drivers/net/ethernet/microchip/vcap/vcap_api_client.h
+++ b/drivers/net/ethernet/microchip/vcap/vcap_api_client.h
@@ -193,6 +193,8 @@ const struct vcap_field *vcap_lookup_keyfield(struct vcap_rule *rule,
 					      enum vcap_key_field key);
 /* Find a rule id with a provided cookie */
 int vcap_lookup_rule_by_cookie(struct vcap_control *vctrl, u64 cookie);
+/* Is the next chain id in the following lookup, possible in another VCAP */
+bool vcap_is_next_lookup(struct vcap_control *vctrl, int cur_cid, int next_cid);
 
 /* Copy to host byte order */
 void vcap_netbytes_copy(u8 *dst, u8 *src, int count);