nfp: flower-ct: add zone table entry when handling pre/post_ct flows

Start populating the pre/post_ct handler functions. Add a zone entry
to the zone table, based on the zone information from the flow. In
the case of a post_ct flow which has a wildcarded match on the zone
create a special entry.
Signed-off-by: Louis Peens <louis.peens@corigine.com>
Signed-off-by: Yinjun Zhang <yinjun.zhang@corigine.com>
Signed-off-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/netronome/nfp/flower/conntrack.c

@@ -3,6 +3,33 @@
 
 #include "conntrack.h"
 
+/**
+ * get_hashentry() - Wrapper around hashtable lookup.
+ * @ht:		hashtable where entry could be found
+ * @key:	key to lookup
+ * @params:	hashtable params
+ * @size:	size of entry to allocate if not in table
+ *
+ * Returns an entry from a hashtable. If entry does not exist
+ * yet allocate the memory for it and return the new entry.
+ */
+static void *get_hashentry(struct rhashtable *ht, void *key,
+			   const struct rhashtable_params params, size_t size)
+{
+	void *result;
+
+	result = rhashtable_lookup_fast(ht, key, params);
+
+	if (result)
+		return result;
+
+	result = kzalloc(size, GFP_KERNEL);
+	if (!result)
+		return ERR_PTR(-ENOMEM);
+
+	return result;
+}
+
 bool is_pre_ct_flow(struct flow_cls_offload *flow)
 {
 	struct flow_action_entry *act;
@@ -29,11 +56,88 @@ bool is_post_ct_flow(struct flow_cls_offload *flow)
 	return false;
 }
 
+static struct
+nfp_fl_ct_zone_entry *get_nfp_zone_entry(struct nfp_flower_priv *priv,
+					 u16 zone, bool wildcarded)
+{
+	struct nfp_fl_ct_zone_entry *zt;
+	int err;
+
+	if (wildcarded && priv->ct_zone_wc)
+		return priv->ct_zone_wc;
+
+	if (!wildcarded) {
+		zt = get_hashentry(&priv->ct_zone_table, &zone,
+				   nfp_zone_table_params, sizeof(*zt));
+
+		/* If priv is set this is an existing entry, just return it */
+		if (IS_ERR(zt) || zt->priv)
+			return zt;
+	} else {
+		zt = kzalloc(sizeof(*zt), GFP_KERNEL);
+		if (!zt)
+			return ERR_PTR(-ENOMEM);
+	}
+
+	zt->zone = zone;
+	zt->priv = priv;
+	zt->nft = NULL;
+
+	if (wildcarded) {
+		priv->ct_zone_wc = zt;
+	} else {
+		err = rhashtable_insert_fast(&priv->ct_zone_table,
+					     &zt->hash_node,
+					     nfp_zone_table_params);
+		if (err)
+			goto err_zone_insert;
+	}
+
+	return zt;
+
+err_zone_insert:
+	kfree(zt);
+	return ERR_PTR(err);
+}
+
+static struct flow_action_entry *get_flow_act(struct flow_cls_offload *flow,
+					      enum flow_action_id act_id)
+{
+	struct flow_action_entry *act = NULL;
+	int i;
+
+	flow_action_for_each(i, act, &flow->rule->action) {
+		if (act->id == act_id)
+			return act;
+	}
+	return NULL;
+}
+
 int nfp_fl_ct_handle_pre_ct(struct nfp_flower_priv *priv,
 			    struct net_device *netdev,
 			    struct flow_cls_offload *flow,
 			    struct netlink_ext_ack *extack)
 {
+	struct flow_action_entry *ct_act;
+	struct nfp_fl_ct_zone_entry *zt;
+
+	ct_act = get_flow_act(flow, FLOW_ACTION_CT);
+	if (!ct_act) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "unsupported offload: Conntrack action empty in conntrack offload");
+		return -EOPNOTSUPP;
+	}
+
+	zt = get_nfp_zone_entry(priv, ct_act->ct.zone, false);
+	if (IS_ERR(zt)) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "offload error: Could not create zone table entry");
+		return PTR_ERR(zt);
+	}
+
+	if (!zt->nft)
+		zt->nft = ct_act->ct.flow_table;
+
 	NL_SET_ERR_MSG_MOD(extack, "unsupported offload: Conntrack action not supported");
 	return -EOPNOTSUPP;
 }
@@ -43,6 +147,27 @@ int nfp_fl_ct_handle_post_ct(struct nfp_flower_priv *priv,
 			     struct flow_cls_offload *flow,
 			     struct netlink_ext_ack *extack)
 {
+	struct flow_rule *rule = flow_cls_offload_flow_rule(flow);
+	struct nfp_fl_ct_zone_entry *zt;
+	bool wildcarded = false;
+	struct flow_match_ct ct;
+
+	flow_rule_match_ct(rule, &ct);
+	if (!ct.mask->ct_zone) {
+		wildcarded = true;
+	} else if (ct.mask->ct_zone != U16_MAX) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "unsupported offload: partially wildcarded ct_zone is not supported");
+		return -EOPNOTSUPP;
+	}
+
+	zt = get_nfp_zone_entry(priv, ct.key->ct_zone, wildcarded);
+	if (IS_ERR(zt)) {
+		NL_SET_ERR_MSG_MOD(extack,
+				   "offload error: Could not create zone table entry");
+		return PTR_ERR(zt);
+	}
+
 	NL_SET_ERR_MSG_MOD(extack, "unsupported offload: Conntrack match not supported");
 	return -EOPNOTSUPP;
 }

drivers/net/ethernet/netronome/nfp/flower/main.h

@@ -194,6 +194,7 @@ struct nfp_fl_internal_ports {
  * @pre_tun_rule_cnt:	Number of pre-tunnel rules offloaded
  * @merge_table:	Hash table to store merged flows
  * @ct_zone_table:	Hash table used to store the different zones
+ * @ct_zone_wc:		Special zone entry for wildcarded zone matches
  */
 struct nfp_flower_priv {
 	struct nfp_app *app;
@@ -229,6 +230,7 @@ struct nfp_flower_priv {
 	int pre_tun_rule_cnt;
 	struct rhashtable merge_table;
 	struct rhashtable ct_zone_table;
+	struct nfp_fl_ct_zone_entry *ct_zone_wc;
 };
 
 /**

drivers/net/ethernet/netronome/nfp/flower/metadata.c

@@ -585,6 +585,9 @@ int nfp_flower_metadata_init(struct nfp_app *app, u64 host_ctx_count,
 
 static void nfp_free_zone_table_entry(void *ptr, void *arg)
 {
+	struct nfp_fl_ct_zone_entry *zt = ptr;
+
+	kfree(zt);
 }
 
 void nfp_flower_metadata_cleanup(struct nfp_app *app)
@@ -602,6 +605,7 @@ void nfp_flower_metadata_cleanup(struct nfp_app *app)
 				    nfp_check_rhashtable_empty, NULL);
 	rhashtable_free_and_destroy(&priv->ct_zone_table,
 				    nfp_free_zone_table_entry, NULL);
+	kfree(priv->ct_zone_wc);
 	kvfree(priv->stats);
 	kfree(priv->mask_ids.mask_id_free_list.buf);
 	kfree(priv->mask_ids.last_used);