net: microchip: sparx5: Match keys in configured port keysets

This tries to match the keys in a rule with the keysets supported by the
VCAP instance, and generate a list of keysets.

This list is then validated against the list of keysets that is currently
selected for the lookups (per port) in the VCAP configuration.

The Sparx5 IS2 only has one actionset, so there is no actionset matching
performed for now.

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

1 files changed, 127 insertions, 10 deletions

diff --git a/drivers/net/ethernet/microchip/vcap/vcap_api.c b/drivers/net/ethernet/microchip/vcap/vcap_api.c
index 0dd9637933b2..37122ba1e201 100644
--- a/drivers/net/ethernet/microchip/vcap/vcap_api.c
+++ b/drivers/net/ethernet/microchip/vcap/vcap_api.c
@@ -757,15 +757,115 @@ static int vcap_add_type_keyfield(struct vcap_rule *rule)
 	return 0;
 }
 
+/* Add a keyset to a keyset list */
+bool vcap_keyset_list_add(struct vcap_keyset_list *keysetlist,
+			  enum vcap_keyfield_set keyset)
+{
+	int idx;
+
+	if (keysetlist->cnt < keysetlist->max) {
+		/* Avoid duplicates */
+		for (idx = 0; idx < keysetlist->cnt; ++idx)
+			if (keysetlist->keysets[idx] == keyset)
+				return keysetlist->cnt < keysetlist->max;
+		keysetlist->keysets[keysetlist->cnt++] = keyset;
+	}
+	return keysetlist->cnt < keysetlist->max;
+}
+EXPORT_SYMBOL_GPL(vcap_keyset_list_add);
+
+/* map keyset id to a string with the keyset name */
+const char *vcap_keyset_name(struct vcap_control *vctrl,
+			     enum vcap_keyfield_set keyset)
+{
+	return vctrl->stats->keyfield_set_names[keyset];
+}
+EXPORT_SYMBOL_GPL(vcap_keyset_name);
+
+/* map key field id to a string with the key name */
+const char *vcap_keyfield_name(struct vcap_control *vctrl,
+			       enum vcap_key_field key)
+{
+	return vctrl->stats->keyfield_names[key];
+}
+EXPORT_SYMBOL_GPL(vcap_keyfield_name);
+
+/* Return the keyfield that matches a key in a keyset */
+static const struct vcap_field *
+vcap_find_keyset_keyfield(struct vcap_control *vctrl,
+			  enum vcap_type vtype,
+			  enum vcap_keyfield_set keyset,
+			  enum vcap_key_field key)
+{
+	const struct vcap_field *fields;
+	int idx, count;
+
+	fields = vcap_keyfields(vctrl, vtype, keyset);
+	if (!fields)
+		return NULL;
+
+	/* Iterate the keyfields of the keyset */
+	count = vcap_keyfield_count(vctrl, vtype, keyset);
+	for (idx = 0; idx < count; ++idx) {
+		if (fields[idx].width == 0)
+			continue;
+
+		if (key == idx)
+			return &fields[idx];
+	}
+
+	return NULL;
+}
+
+/* Match a list of keys against the keysets available in a vcap type */
+static bool vcap_rule_find_keysets(struct vcap_rule_internal *ri,
+				   struct vcap_keyset_list *matches)
+{
+	const struct vcap_client_keyfield *ckf;
+	int keyset, found, keycount, map_size;
+	const struct vcap_field **map;
+	enum vcap_type vtype;
+
+	vtype = ri->admin->vtype;
+	map = ri->vctrl->vcaps[vtype].keyfield_set_map;
+	map_size = ri->vctrl->vcaps[vtype].keyfield_set_size;
+
+	/* Get a count of the keyfields we want to match */
+	keycount = 0;
+	list_for_each_entry(ckf, &ri->data.keyfields, ctrl.list)
+		++keycount;
+
+	matches->cnt = 0;
+	/* Iterate the keysets of the VCAP */
+	for (keyset = 0; keyset < map_size; ++keyset) {
+		if (!map[keyset])
+			continue;
+
+		/* Iterate the keys in the rule */
+		found = 0;
+		list_for_each_entry(ckf, &ri->data.keyfields, ctrl.list)
+			if (vcap_find_keyset_keyfield(ri->vctrl, vtype,
+						      keyset, ckf->ctrl.key))
+				++found;
+
+		/* Save the keyset if all keyfields were found */
+		if (found == keycount)
+			if (!vcap_keyset_list_add(matches, keyset))
+				/* bail out when the quota is filled */
+				break;
+	}
+
+	return matches->cnt > 0;
+}
+
 /* Validate a rule with respect to available port keys */
 int vcap_val_rule(struct vcap_rule *rule, u16 l3_proto)
 {
 	struct vcap_rule_internal *ri = to_intrule(rule);
+	struct vcap_keyset_list matches = {};
 	enum vcap_keyfield_set keysets[10];
-	struct vcap_keyset_list kslist;
 	int ret;
 
-	/* This validation will be much expanded later */
 	ret = vcap_api_check(ri->vctrl);
 	if (ret)
 		return ret;
@@ -777,24 +877,41 @@ int vcap_val_rule(struct vcap_rule *rule, u16 l3_proto)
 		ri->data.exterr = VCAP_ERR_NO_NETDEV;
 		return -EINVAL;
 	}
+
+	matches.keysets = keysets;
+	matches.max = ARRAY_SIZE(keysets);
 	if (ri->data.keyset == VCAP_KFS_NO_VALUE) {
-		ri->data.exterr = VCAP_ERR_NO_KEYSET_MATCH;
-		return -EINVAL;
+		/* Iterate over rule keyfields and select keysets that fits */
+		if (!vcap_rule_find_keysets(ri, &matches)) {
+			ri->data.exterr = VCAP_ERR_NO_KEYSET_MATCH;
+			return -EINVAL;
+		}
+	} else {
+		/* prepare for keyset validation */
+		keysets[0] = ri->data.keyset;
+		matches.cnt = 1;
 	}
-	/* prepare for keyset validation */
-	keysets[0] = ri->data.keyset;
-	kslist.keysets = keysets;
-	kslist.cnt = 1;
+
 	/* Pick a keyset that is supported in the port lookups */
-	ret = ri->vctrl->ops->validate_keyset(ri->ndev, ri->admin, rule, &kslist,
-					      l3_proto);
+	ret = ri->vctrl->ops->validate_keyset(ri->ndev, ri->admin, rule,
+					      &matches, l3_proto);
 	if (ret < 0) {
 		pr_err("%s:%d: keyset validation failed: %d\n",
 		       __func__, __LINE__, ret);
 		ri->data.exterr = VCAP_ERR_NO_PORT_KEYSET_MATCH;
 		return ret;
 	}
+	/* use the keyset that is supported in the port lookups */
+	ret = vcap_set_rule_set_keyset(rule, ret);
+	if (ret < 0) {
+		pr_err("%s:%d: keyset was not updated: %d\n",
+		       __func__, __LINE__, ret);
+		return ret;
+	}
 	if (ri->data.actionset == VCAP_AFS_NO_VALUE) {
+		/* Later also actionsets will be matched against actions in
+		 * the rule, and the type will be set accordingly
+		 */
 		ri->data.exterr = VCAP_ERR_NO_ACTIONSET_MATCH;
 		return -EINVAL;
 	}