nfp: flower-ct: add tc_merge_tb

Add the table required to store the merge result of pre_ct and post_ct
flows. This is just the initial setup and teardown of the table,
the implementation will be in follow-up patches.
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 +3,14 @@
 
 #include "conntrack.h"
 
+const struct rhashtable_params nfp_tc_ct_merge_params = {
+	.head_offset		= offsetof(struct nfp_fl_ct_tc_merge,
+					   hash_node),
+	.key_len		= sizeof(unsigned long) * 2,
+	.key_offset		= offsetof(struct nfp_fl_ct_tc_merge, cookie),
+	.automatic_shrinking	= true,
+};
+
 /**
  * get_hashentry() - Wrapper around hashtable lookup.
  * @ht:		hashtable where entry could be found
@@ -87,6 +95,10 @@ nfp_fl_ct_zone_entry *get_nfp_zone_entry(struct nfp_flower_priv *priv,
 	INIT_LIST_HEAD(&zt->pre_ct_list);
 	INIT_LIST_HEAD(&zt->post_ct_list);
 
+	err = rhashtable_init(&zt->tc_merge_tb, &nfp_tc_ct_merge_params);
+	if (err)
+		goto err_tc_merge_tb_init;
+
 	if (wildcarded) {
 		priv->ct_zone_wc = zt;
 	} else {
@@ -100,6 +112,8 @@ nfp_fl_ct_zone_entry *get_nfp_zone_entry(struct nfp_flower_priv *priv,
 	return zt;
 
 err_zone_insert:
+	rhashtable_destroy(&zt->tc_merge_tb);
+err_tc_merge_tb_init:
 	kfree(zt);
 	return ERR_PTR(err);
 }

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

@@ -10,6 +10,7 @@
 
 extern const struct rhashtable_params nfp_zone_table_params;
 extern const struct rhashtable_params nfp_ct_map_params;
+extern const struct rhashtable_params nfp_tc_ct_merge_params;
 
 /**
  * struct nfp_fl_ct_zone_entry - Zone entry containing conntrack flow information
@@ -23,6 +24,9 @@ extern const struct rhashtable_params nfp_ct_map_params;
  *
  * @post_ct_list:	The post_ct_list of nfp_fl_ct_flow_entry entries
  * @post_ct_count:	Keep count of the number of post_ct entries
+ *
+ * @tc_merge_tb:	The table of merged tc flows
+ * @tc_merge_count:	Keep count of the number of merged tc entries
  */
 struct nfp_fl_ct_zone_entry {
 	u16 zone;
@@ -36,6 +40,9 @@ struct nfp_fl_ct_zone_entry {
 
 	struct list_head post_ct_list;
 	unsigned int post_ct_count;
+
+	struct rhashtable tc_merge_tb;
+	unsigned int tc_merge_count;
 };
 
 enum ct_entry_type {
@@ -70,6 +77,28 @@ struct nfp_fl_ct_flow_entry {
 	u8 tun_offset;		// Set to NFP_FL_CT_NO_TUN if no tun
 };
 
+/**
+ * struct nfp_fl_ct_tc_merge - Merge of two flows from tc
+ * @cookie:		Flow cookie, combination of pre and post ct cookies
+ * @hash_node:		Used by the hashtable
+ * @pre_ct_list:	This entry is part of a pre_ct_list
+ * @post_ct_list:	This entry is part of a post_ct_list
+ * @zt:			Reference to the zone table this belongs to
+ * @pre_ct_parent:	The pre_ct_parent
+ * @post_ct_parent:	The post_ct_parent
+ * @children:		List of nft merged entries
+ */
+struct nfp_fl_ct_tc_merge {
+	unsigned long cookie[2];
+	struct rhash_head hash_node;
+	struct list_head pre_ct_list;
+	struct list_head post_ct_list;
+	struct nfp_fl_ct_zone_entry *zt;
+	struct nfp_fl_ct_flow_entry *pre_ct_parent;
+	struct nfp_fl_ct_flow_entry *post_ct_parent;
+	struct list_head children;
+};
+
 /**
  * struct nfp_fl_ct_map_entry - Map between flow cookie and specific ct_flow
  * @cookie:	Flow cookie, same as original TC flow, used as key

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

@@ -638,6 +638,10 @@ static void nfp_zone_table_entry_destroy(struct nfp_fl_ct_zone_entry *zt)
 			kfree(map);
 		}
 	}
+
+	rhashtable_free_and_destroy(&zt->tc_merge_tb,
+				    nfp_check_rhashtable_empty, NULL);
+
 	kfree(zt);
 }