net: microchip: vcap api: Enable/Disable rules via chains in VCAP HW

This supports that individual rules are enabled and disabled via chain
information.
This is done by keeping disabled rules in the VCAP list (cached) until they
are enabled, and only at this time are the rules written to the VCAP HW.
Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Signed-off-by: Steen Hegelund <steen.hegelund@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -1990,6 +1990,9 @@ static bool vcap_path_exist(struct vcap_control *vctrl, struct net_device *ndev,
 	struct vcap_admin *admin;
 	int tmp;
 
+	if (dst_cid == 0) /* Chain zero is always available */
+		return true;
+
 	/* Find first entry that starts from chain 0*/
 	list_for_each_entry(admin, &vctrl->list, list) {
 		list_for_each_entry(elem, &admin->enabled, list) {
@@ -2025,8 +2028,6 @@ static void vcap_rule_set_state(struct vcap_rule_internal *ri)
 		ri->state = VCAP_RS_ENABLED;
 	else
 		ri->state = VCAP_RS_DISABLED;
-	/* For now always store directly in HW */
-	ri->state = VCAP_RS_PERMANENT;
 }
 
 /* Encode and write a validated rule to the VCAP */
@@ -2711,6 +2712,125 @@ void vcap_set_tc_exterr(struct flow_cls_offload *fco, struct vcap_rule *vrule)
 }
 EXPORT_SYMBOL_GPL(vcap_set_tc_exterr);
 
+/* Write a rule to VCAP HW to enable it */
+static int vcap_enable_rule(struct vcap_rule_internal *ri)
+{
+	struct vcap_client_actionfield *af, *naf;
+	struct vcap_client_keyfield *kf, *nkf;
+	int err;
+
+	vcap_erase_cache(ri);
+	err = vcap_encode_rule(ri);
+	if (err)
+		goto out;
+	err = vcap_write_rule(ri);
+	if (err)
+		goto out;
+
+	/* Deallocate the list of keys and actions */
+	list_for_each_entry_safe(kf, nkf, &ri->data.keyfields, ctrl.list) {
+		list_del(&kf->ctrl.list);
+		kfree(kf);
+	}
+	list_for_each_entry_safe(af, naf, &ri->data.actionfields, ctrl.list) {
+		list_del(&af->ctrl.list);
+		kfree(af);
+	}
+	ri->state = VCAP_RS_ENABLED;
+out:
+	return err;
+}
+
+/* Enable all disabled rules for a specific chain/port in the VCAP HW */
+static int vcap_enable_rules(struct vcap_control *vctrl,
+			     struct net_device *ndev, int chain)
+{
+	struct vcap_rule_internal *ri;
+	struct vcap_admin *admin;
+	int err = 0;
+
+	list_for_each_entry(admin, &vctrl->list, list) {
+		if (!(chain >= admin->first_cid && chain <= admin->last_cid))
+			continue;
+
+		/* Found the admin, now find the offloadable rules */
+		mutex_lock(&admin->lock);
+		list_for_each_entry(ri, &admin->rules, list) {
+			if (ri->data.vcap_chain_id != chain)
+				continue;
+
+			if (ri->ndev != ndev)
+				continue;
+
+			if (ri->state != VCAP_RS_DISABLED)
+				continue;
+
+			err = vcap_enable_rule(ri);
+			if (err)
+				break;
+		}
+		mutex_unlock(&admin->lock);
+		if (err)
+			break;
+	}
+	return err;
+}
+
+/* Read and erase a rule from VCAP HW to disable it */
+static int vcap_disable_rule(struct vcap_rule_internal *ri)
+{
+	int err;
+
+	err = vcap_read_rule(ri);
+	if (err)
+		return err;
+	err = vcap_decode_keyset(ri);
+	if (err)
+		return err;
+	err = vcap_decode_actionset(ri);
+	if (err)
+		return err;
+
+	ri->state = VCAP_RS_DISABLED;
+	ri->vctrl->ops->init(ri->ndev, ri->admin, ri->addr, ri->size);
+	return 0;
+}
+
+/* Disable all enabled rules for a specific chain/port in the VCAP HW */
+static int vcap_disable_rules(struct vcap_control *vctrl,
+			      struct net_device *ndev, int chain)
+{
+	struct vcap_rule_internal *ri;
+	struct vcap_admin *admin;
+	int err = 0;
+
+	list_for_each_entry(admin, &vctrl->list, list) {
+		if (!(chain >= admin->first_cid && chain <= admin->last_cid))
+			continue;
+
+		/* Found the admin, now find the rules on the chain */
+		mutex_lock(&admin->lock);
+		list_for_each_entry(ri, &admin->rules, list) {
+			if (ri->data.vcap_chain_id != chain)
+				continue;
+
+			if (ri->ndev != ndev)
+				continue;
+
+			if (ri->state != VCAP_RS_ENABLED)
+				continue;
+
+			err = vcap_disable_rule(ri);
+			if (err)
+				break;
+		}
+		mutex_unlock(&admin->lock);
+		if (err)
+			break;
+	}
+	return err;
+}
+
 /* Check if this port is already enabled for this VCAP instance */
 static bool vcap_is_enabled(struct vcap_control *vctrl, struct net_device *ndev,
 			    int dst_cid)
@@ -2752,6 +2872,17 @@ static int vcap_enable(struct vcap_control *vctrl, struct net_device *ndev,
 	list_add_tail(&eport->list, &admin->enabled);
 	mutex_unlock(&admin->lock);
 
+	if (vcap_path_exist(vctrl, ndev, src_cid)) {
+		/* Enable chained lookups */
+		while (dst_cid) {
+			admin = vcap_find_admin(vctrl, dst_cid);
+			if (!admin)
+				return -ENOENT;
+
+			vcap_enable_rules(vctrl, ndev, dst_cid);
+			dst_cid = vcap_get_next_chain(vctrl, ndev, dst_cid);
+		}
+	}
 	return 0;
 }
 
@@ -2761,6 +2892,7 @@ static int vcap_disable(struct vcap_control *vctrl, struct net_device *ndev,
 {
 	struct vcap_enabled_port *elem, *eport = NULL;
 	struct vcap_admin *found = NULL, *admin;
+	int dst_cid;
 
 	list_for_each_entry(admin, &vctrl->list, list) {
 		list_for_each_entry(elem, &admin->enabled, list) {
@@ -2777,6 +2909,17 @@ static int vcap_disable(struct vcap_control *vctrl, struct net_device *ndev,
 	if (!eport)
 		return -ENOENT;
 
+	/* Disable chained lookups */
+	dst_cid = eport->dst_cid;
+	while (dst_cid) {
+		admin = vcap_find_admin(vctrl, dst_cid);
+		if (!admin)
+			return -ENOENT;
+
+		vcap_disable_rules(vctrl, ndev, dst_cid);
+		dst_cid = vcap_get_next_chain(vctrl, ndev, dst_cid);
+	}
+
 	mutex_lock(&found->lock);
 	list_del(&eport->list);
 	mutex_unlock(&found->lock);
@@ -2903,6 +3046,65 @@ int vcap_rule_get_counter(struct vcap_rule *rule, struct vcap_counter *ctr)
 }
 EXPORT_SYMBOL_GPL(vcap_rule_get_counter);
 
+/* Get a copy of a client key field */
+static int vcap_rule_get_key(struct vcap_rule *rule,
+			     enum vcap_key_field key,
+			     struct vcap_client_keyfield *ckf)
+{
+	struct vcap_client_keyfield *field;
+
+	field = vcap_find_keyfield(rule, key);
+	if (!field)
+		return -EINVAL;
+	memcpy(ckf, field, sizeof(*ckf));
+	INIT_LIST_HEAD(&ckf->ctrl.list);
+	return 0;
+}
+
+/* Get the keysets that matches the rule key type/mask */
+int vcap_rule_get_keysets(struct vcap_rule_internal *ri,
+			  struct vcap_keyset_list *matches)
+{
+	struct vcap_control *vctrl = ri->vctrl;
+	enum vcap_type vt = ri->admin->vtype;
+	const struct vcap_set *keyfield_set;
+	struct vcap_client_keyfield kf = {};
+	u32 value, mask;
+	int err, idx;
+
+	err = vcap_rule_get_key(&ri->data, VCAP_KF_TYPE, &kf);
+	if (err)
+		return err;
+
+	if (kf.ctrl.type == VCAP_FIELD_BIT) {
+		value = kf.data.u1.value;
+		mask = kf.data.u1.mask;
+	} else if (kf.ctrl.type == VCAP_FIELD_U32) {
+		value = kf.data.u32.value;
+		mask = kf.data.u32.mask;
+	} else {
+		return -EINVAL;
+	}
+
+	keyfield_set = vctrl->vcaps[vt].keyfield_set;
+	for (idx = 0; idx < vctrl->vcaps[vt].keyfield_set_size; ++idx) {
+		if (keyfield_set[idx].sw_per_item != ri->keyset_sw)
+			continue;
+
+		if (keyfield_set[idx].type_id == (u8)-1) {
+			vcap_keyset_list_add(matches, idx);
+			continue;
+		}
+
+		if ((keyfield_set[idx].type_id & mask) == value)
+			vcap_keyset_list_add(matches, idx);
+	}
+	if (matches->cnt > 0)
+		return 0;
+
+	return -EINVAL;
+}
+
 static int vcap_rule_mod_key(struct vcap_rule *rule,
 			     enum vcap_key_field key,
 			     enum vcap_field_type ftype,

drivers/net/ethernet/microchip/vcap/vcap_api_client.h

@@ -264,5 +264,4 @@ int vcap_rule_mod_action_u32(struct vcap_rule *rule,
 /* Get a 32 bit key field value and mask from the rule */
 int vcap_rule_get_key_u32(struct vcap_rule *rule, enum vcap_key_field key,
 			  u32 *value, u32 *mask);
-
 #endif /* __VCAP_API_CLIENT__ */

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

@@ -164,10 +164,13 @@ static int vcap_debugfs_show_keysets(struct vcap_rule_internal *ri,
 	matches.cnt = 0;
 	matches.max = ARRAY_SIZE(keysets);
 
-	err = vcap_find_keystream_keysets(ri->vctrl, admin->vtype,
-					  admin->cache.keystream,
-					  admin->cache.maskstream,
-					  false, 0, &matches);
+	if (ri->state == VCAP_RS_DISABLED)
+		err = vcap_rule_get_keysets(ri, &matches);
+	else
+		err = vcap_find_keystream_keysets(ri->vctrl, admin->vtype,
+						  admin->cache.keystream,
+						  admin->cache.maskstream,
+						  false, 0, &matches);
 	if (err) {
 		pr_err("%s:%d: could not find valid keysets: %d\n",
 		       __func__, __LINE__, err);

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

@@ -1305,8 +1305,8 @@ static void vcap_api_encode_rule_test(struct kunit *test)
 
 	struct vcap_admin is2_admin = {
 		.vtype = VCAP_TYPE_IS2,
-		.first_cid = 10000,
-		.last_cid = 19999,
+		.first_cid = 8000000,
+		.last_cid = 8099999,
 		.lookups = 4,
 		.last_valid_addr = 3071,
 		.first_valid_addr = 0,
@@ -1319,7 +1319,7 @@ static void vcap_api_encode_rule_test(struct kunit *test)
 	};
 	struct vcap_rule *rule;
 	struct vcap_rule_internal *ri;
-	int vcap_chain_id = 10005;
+	int vcap_chain_id = 8000000;
 	enum vcap_user user = VCAP_USER_VCAP_UTIL;
 	u16 priority = 10;
 	int id = 100;
@@ -1391,6 +1391,11 @@ static void vcap_api_encode_rule_test(struct kunit *test)
 	KUNIT_EXPECT_EQ(test, 2, ri->keyset_sw_regs);
 	KUNIT_EXPECT_EQ(test, 4, ri->actionset_sw_regs);
 
+	/* Enable lookup, so the rule will be written */
+	ret = vcap_enable_lookups(&test_vctrl, &test_netdev, 0,
+				  rule->vcap_chain_id, rule->cookie, true);
+	KUNIT_EXPECT_EQ(test, 0, ret);
+
 	/* Add rule with write callback */
 	ret = vcap_add_rule(rule);
 	KUNIT_EXPECT_EQ(test, 0, ret);

drivers/net/ethernet/microchip/vcap/vcap_api_private.h

@@ -115,4 +115,7 @@ int vcap_find_keystream_keysets(struct vcap_control *vctrl, enum vcap_type vt,
 				u32 *keystream, u32 *mskstream, bool mask,
 				int sw_max, struct vcap_keyset_list *kslist);
 
+/* Get the keysets that matches the rule key type/mask */
+int vcap_rule_get_keysets(struct vcap_rule_internal *ri,
+			  struct vcap_keyset_list *matches);
 #endif /* __VCAP_API_PRIVATE__ */