Merge branch 'sparx5-tc-flower-templates'

Steen Hegelund says:

====================
Add support for TC flower templates in Sparx5

This adds support for the TC template mechanism in the Sparx5 flower filter
implementation.

Templates are as such handled by the TC framework, but when a template is
created (using a chain id) there are by definition no filters on this
chain (an error will be returned if there are any).

If the templates chain id is one that is represented by a VCAP lookup, then
when the template is created, we know that it is safe to use the keys
provided in the template to change the keyset configuration for the (port,
lookup) combination, if this is needed to improve the match on the
template.

The original port keyset configuration is captured in the template state
information which is kept per port, so that when the template is deleted
the port keyset configuration can be restored to its previous setting.

The template also provides the protocol parameter which is the basic
information that is used to find out which port keyset configuration needs
to be changed.

The VCAPs and lookups are slightly different when it comes to which keys,
keysets and protocol are supported and used for selection, so in some
cases a bit of tweaking is needed to find a useful match.  This is done by
e.g. removing a key that prevents the best matching keyset from being
selected.

The debugfs output that is provided for a port allows inspection of the
currently used keyset in each of the VCAPs lookups.  So when a template has
been created the debugfs output allows you to verify if the keyset
configuration has been changed successfully.
====================

Signed-off-by: David S. Miller <[email protected]>

Author: davem330

drivers/net/ethernet/microchip/sparx5/sparx5_main.c

@@ -282,6 +282,7 @@ static int sparx5_create_port(struct sparx5 *sparx5,
 	spx5_port->phylink_pcs.poll = true;
 	spx5_port->phylink_pcs.ops = &sparx5_phylink_pcs_ops;
 	spx5_port->is_mrouter = false;
+	INIT_LIST_HEAD(&spx5_port->tc_templates);
 	sparx5->ports[config->portno] = spx5_port;
 
 	err = sparx5_port_init(sparx5, spx5_port, &config->conf);

drivers/net/ethernet/microchip/sparx5/sparx5_main.h

@@ -192,6 +192,7 @@ struct sparx5_port {
 	u16 ts_id;
 	struct sk_buff_head tx_skbs;
 	bool is_mrouter;
+	struct list_head tc_templates; /* list of TC templates on this port */
 };
 
 enum sparx5_core_clockfreq {

drivers/net/ethernet/microchip/sparx5/sparx5_tc_flower.c

@@ -28,6 +28,14 @@ struct sparx5_multiple_rules {
 	struct sparx5_wildcard_rule rule[SPX5_MAX_RULE_SIZE];
 };
 
+struct sparx5_tc_flower_template {
+	struct list_head list; /* for insertion in the list of templates */
+	int cid; /* chain id */
+	enum vcap_keyfield_set orig; /* keyset used before the template */
+	enum vcap_keyfield_set keyset; /* new keyset used by template */
+	u16 l3_proto; /* protocol specified in the template */
+};
+
 static int
 sparx5_tc_flower_es0_tpid(struct vcap_tc_flower_parse_usage *st)
 {
@@ -382,7 +390,7 @@ static int sparx5_tc_select_protocol_keyset(struct net_device *ndev,
 	/* Find the keysets that the rule can use */
 	matches.keysets = keysets;
 	matches.max = ARRAY_SIZE(keysets);
-	if (vcap_rule_find_keysets(vrule, &matches) == 0)
+	if (!vcap_rule_find_keysets(vrule, &matches))
 		return -EINVAL;
 
 	/* Find the keysets that the port configuration supports */
@@ -996,6 +1004,73 @@ static int sparx5_tc_action_vlan_push(struct vcap_admin *admin,
 	return err;
 }
 
+/* Remove rule keys that may prevent templates from matching a keyset */
+static void sparx5_tc_flower_simplify_rule(struct vcap_admin *admin,
+					   struct vcap_rule *vrule,
+					   u16 l3_proto)
+{
+	switch (admin->vtype) {
+	case VCAP_TYPE_IS0:
+		vcap_rule_rem_key(vrule, VCAP_KF_ETYPE);
+		switch (l3_proto) {
+		case ETH_P_IP:
+			break;
+		case ETH_P_IPV6:
+			vcap_rule_rem_key(vrule, VCAP_KF_IP_SNAP_IS);
+			break;
+		default:
+			break;
+		}
+		break;
+	case VCAP_TYPE_ES2:
+		switch (l3_proto) {
+		case ETH_P_IP:
+			if (vrule->keyset == VCAP_KFS_IP4_OTHER)
+				vcap_rule_rem_key(vrule, VCAP_KF_TCP_IS);
+			break;
+		case ETH_P_IPV6:
+			if (vrule->keyset == VCAP_KFS_IP6_STD)
+				vcap_rule_rem_key(vrule, VCAP_KF_TCP_IS);
+			vcap_rule_rem_key(vrule, VCAP_KF_IP4_IS);
+			break;
+		default:
+			break;
+		}
+		break;
+	case VCAP_TYPE_IS2:
+		switch (l3_proto) {
+		case ETH_P_IP:
+		case ETH_P_IPV6:
+			vcap_rule_rem_key(vrule, VCAP_KF_IP4_IS);
+			break;
+		default:
+			break;
+		}
+		break;
+	default:
+		break;
+	}
+}
+
+static bool sparx5_tc_flower_use_template(struct net_device *ndev,
+					  struct flow_cls_offload *fco,
+					  struct vcap_admin *admin,
+					  struct vcap_rule *vrule)
+{
+	struct sparx5_port *port = netdev_priv(ndev);
+	struct sparx5_tc_flower_template *ftp;
+
+	list_for_each_entry(ftp, &port->tc_templates, list) {
+		if (ftp->cid != fco->common.chain_index)
+			continue;
+
+		vcap_set_rule_set_keyset(vrule, ftp->keyset);
+		sparx5_tc_flower_simplify_rule(admin, vrule, ftp->l3_proto);
+		return true;
+	}
+	return false;
+}
+
 static int sparx5_tc_flower_replace(struct net_device *ndev,
 				    struct flow_cls_offload *fco,
 				    struct vcap_admin *admin,
@@ -1122,12 +1197,14 @@ static int sparx5_tc_flower_replace(struct net_device *ndev,
 			goto out;
 	}
 
-	err = sparx5_tc_select_protocol_keyset(ndev, vrule, admin,
-					       state.l3_proto, &multi);
-	if (err) {
-		NL_SET_ERR_MSG_MOD(fco->common.extack,
-				   "No matching port keyset for filter protocol and keys");
-		goto out;
+	if (!sparx5_tc_flower_use_template(ndev, fco, admin, vrule)) {
+		err = sparx5_tc_select_protocol_keyset(ndev, vrule, admin,
+						       state.l3_proto, &multi);
+		if (err) {
+			NL_SET_ERR_MSG_MOD(fco->common.extack,
+					   "No matching port keyset for filter protocol and keys");
+			goto out;
+		}
 	}
 
 	/* provide the l3 protocol to guide the keyset selection */
@@ -1259,6 +1336,120 @@ static int sparx5_tc_flower_stats(struct net_device *ndev,
 	return err;
 }
 
+static int sparx5_tc_flower_template_create(struct net_device *ndev,
+					    struct flow_cls_offload *fco,
+					    struct vcap_admin *admin)
+{
+	struct sparx5_port *port = netdev_priv(ndev);
+	struct vcap_tc_flower_parse_usage state = {
+		.fco = fco,
+		.l3_proto = ETH_P_ALL,
+		.admin = admin,
+	};
+	struct sparx5_tc_flower_template *ftp;
+	struct vcap_keyset_list kslist = {};
+	enum vcap_keyfield_set keysets[10];
+	struct vcap_control *vctrl;
+	struct vcap_rule *vrule;
+	int count, err;
+
+	if (admin->vtype == VCAP_TYPE_ES0) {
+		pr_err("%s:%d: %s\n", __func__, __LINE__,
+		       "VCAP does not support templates");
+		return -EINVAL;
+	}
+
+	count = vcap_admin_rule_count(admin, fco->common.chain_index);
+	if (count > 0) {
+		pr_err("%s:%d: %s\n", __func__, __LINE__,
+		       "Filters are already present");
+		return -EBUSY;
+	}
+
+	ftp = kzalloc(sizeof(*ftp), GFP_KERNEL);
+	if (!ftp)
+		return -ENOMEM;
+
+	ftp->cid = fco->common.chain_index;
+	ftp->orig = VCAP_KFS_NO_VALUE;
+	ftp->keyset = VCAP_KFS_NO_VALUE;
+
+	vctrl = port->sparx5->vcap_ctrl;
+	vrule = vcap_alloc_rule(vctrl, ndev, fco->common.chain_index,
+				VCAP_USER_TC, fco->common.prio, 0);
+	if (IS_ERR(vrule)) {
+		err = PTR_ERR(vrule);
+		goto err_rule;
+	}
+
+	state.vrule = vrule;
+	state.frule = flow_cls_offload_flow_rule(fco);
+	err = sparx5_tc_use_dissectors(&state, admin, vrule);
+	if (err) {
+		pr_err("%s:%d: key error: %d\n", __func__, __LINE__, err);
+		goto out;
+	}
+
+	ftp->l3_proto = state.l3_proto;
+
+	sparx5_tc_flower_simplify_rule(admin, vrule, state.l3_proto);
+
+	/* Find the keysets that the rule can use */
+	kslist.keysets = keysets;
+	kslist.max = ARRAY_SIZE(keysets);
+	if (!vcap_rule_find_keysets(vrule, &kslist)) {
+		pr_err("%s:%d: %s\n", __func__, __LINE__,
+		       "Could not find a suitable keyset");
+		err = -ENOENT;
+		goto out;
+	}
+
+	ftp->keyset = vcap_select_min_rule_keyset(vctrl, admin->vtype, &kslist);
+	kslist.cnt = 0;
+	sparx5_vcap_set_port_keyset(ndev, admin, fco->common.chain_index,
+				    state.l3_proto,
+				    ftp->keyset,
+				    &kslist);
+
+	if (kslist.cnt > 0)
+		ftp->orig = kslist.keysets[0];
+
+	/* Store new template */
+	list_add_tail(&ftp->list, &port->tc_templates);
+	vcap_free_rule(vrule);
+	return 0;
+
+out:
+	vcap_free_rule(vrule);
+err_rule:
+	kfree(ftp);
+	return err;
+}
+
+static int sparx5_tc_flower_template_destroy(struct net_device *ndev,
+					     struct flow_cls_offload *fco,
+					     struct vcap_admin *admin)
+{
+	struct sparx5_port *port = netdev_priv(ndev);
+	struct sparx5_tc_flower_template *ftp, *tmp;
+	int err = -ENOENT;
+
+	/* Rules using the template are removed by the tc framework */
+	list_for_each_entry_safe(ftp, tmp, &port->tc_templates, list) {
+		if (ftp->cid != fco->common.chain_index)
+			continue;
+
+		sparx5_vcap_set_port_keyset(ndev, admin,
+					    fco->common.chain_index,
+					    ftp->l3_proto, ftp->orig,
+					    NULL);
+		list_del(&ftp->list);
+		kfree(ftp);
+		break;
+	}
+	return err;
+}
+
 int sparx5_tc_flower(struct net_device *ndev, struct flow_cls_offload *fco,
 		     bool ingress)
 {
@@ -1282,6 +1473,10 @@ int sparx5_tc_flower(struct net_device *ndev, struct flow_cls_offload *fco,
 		return sparx5_tc_flower_destroy(ndev, fco, admin);
 	case FLOW_CLS_STATS:
 		return sparx5_tc_flower_stats(ndev, fco, admin);
+	case FLOW_CLS_TMPLT_CREATE:
+		return sparx5_tc_flower_template_create(ndev, fco, admin);
+	case FLOW_CLS_TMPLT_DESTROY:
+		return sparx5_tc_flower_template_destroy(ndev, fco, admin);
 	default:
 		return -EOPNOTSUPP;
 	}

drivers/net/ethernet/microchip/sparx5/sparx5_vcap_debugfs.c

@@ -198,7 +198,7 @@ static void sparx5_vcap_is2_port_keys(struct sparx5 *sparx5,
 			out->prf(out->dst, "ip6_std");
 			break;
 		case VCAP_IS2_PS_IPV6_MC_IP4_TCP_UDP_OTHER:
-			out->prf(out->dst, "ip4_tcp_udp ipv4_other");
+			out->prf(out->dst, "ip4_tcp_udp ip4_other");
 			break;
 		}
 		out->prf(out->dst, "\n      ipv6_uc: ");