nfp: flower-ct: add nft_merge table

Add table and struct to save the result of the three-way merge
between pre_ct,post_ct, and nft flows. Merging code is to be
added 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

@@ -11,6 +11,14 @@ const struct rhashtable_params nfp_tc_ct_merge_params = {
 	.automatic_shrinking	= true,
 };
 
+const struct rhashtable_params nfp_nft_ct_merge_params = {
+	.head_offset		= offsetof(struct nfp_fl_nft_tc_merge,
+					   hash_node),
+	.key_len		= sizeof(unsigned long) * 3,
+	.key_offset		= offsetof(struct nfp_fl_nft_tc_merge, cookie),
+	.automatic_shrinking	= true,
+};
+
 /**
  * get_hashentry() - Wrapper around hashtable lookup.
  * @ht:		hashtable where entry could be found
@@ -171,6 +179,10 @@ nfp_fl_ct_zone_entry *get_nfp_zone_entry(struct nfp_flower_priv *priv,
 	if (err)
 		goto err_tc_merge_tb_init;
 
+	err = rhashtable_init(&zt->nft_merge_tb, &nfp_nft_ct_merge_params);
+	if (err)
+		goto err_nft_merge_tb_init;
+
 	if (wildcarded) {
 		priv->ct_zone_wc = zt;
 	} else {
@@ -184,6 +196,8 @@ nfp_fl_ct_zone_entry *get_nfp_zone_entry(struct nfp_flower_priv *priv,
 	return zt;
 
 err_zone_insert:
+	rhashtable_destroy(&zt->nft_merge_tb);
+err_nft_merge_tb_init:
 	rhashtable_destroy(&zt->tc_merge_tb);
 err_tc_merge_tb_init:
 	kfree(zt);

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

@@ -12,6 +12,7 @@
 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;
+extern const struct rhashtable_params nfp_nft_ct_merge_params;
 
 /**
  * struct nfp_fl_ct_zone_entry - Zone entry containing conntrack flow information
@@ -31,6 +32,9 @@ extern const struct rhashtable_params nfp_tc_ct_merge_params;
  *
  * @nft_flows_list:	The list of nft relatednfp_fl_ct_flow_entry entries
  * @nft_flows_count:	Keep count of the number of nft_flow entries
+ *
+ * @nft_merge_tb:	The table of merged tc+nft flows
+ * @nft_merge_count:	Keep count of the number of merged tc+nft entries
  */
 struct nfp_fl_ct_zone_entry {
 	u16 zone;
@@ -50,6 +54,9 @@ struct nfp_fl_ct_zone_entry {
 
 	struct list_head nft_flows_list;
 	unsigned int nft_flows_count;
+
+	struct rhashtable nft_merge_tb;
+	unsigned int nft_merge_count;
 };
 
 enum ct_entry_type {
@@ -106,6 +113,32 @@ struct nfp_fl_ct_tc_merge {
 	struct list_head children;
 };
 
+/**
+ * struct nfp_fl_nft_tc_merge - Merge of tc_merge flows with nft flow
+ * @netdev:		Ingress netdev name
+ * @cookie:		Flow cookie, combination of tc_merge and nft cookies
+ * @hash_node:		Used by the hashtable
+ * @zt:	Reference to the zone table this belongs to
+ * @nft_flow_list:	This entry is part of a nft_flows_list
+ * @tc_merge_list:	This entry is part of a ct_merge_list
+ * @tc_m_parent:	The tc_merge parent
+ * @nft_parent:	The nft_entry parent
+ * @tc_flower_cookie:	The cookie of the flow offloaded to the nfp
+ * @flow_pay:	Reference to the offloaded flow struct
+ */
+struct nfp_fl_nft_tc_merge {
+	struct net_device *netdev;
+	unsigned long cookie[3];
+	struct rhash_head hash_node;
+	struct nfp_fl_ct_zone_entry *zt;
+	struct list_head nft_flow_list;
+	struct list_head tc_merge_list;
+	struct nfp_fl_ct_tc_merge *tc_m_parent;
+	struct nfp_fl_ct_flow_entry *nft_parent;
+	unsigned long tc_flower_cookie;
+	struct nfp_fl_payload *flow_pay;
+};
+
 /**
  * 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

@@ -667,6 +667,8 @@ static void nfp_zone_table_entry_destroy(struct nfp_fl_ct_zone_entry *zt)
 
 	rhashtable_free_and_destroy(&zt->tc_merge_tb,
 				    nfp_check_rhashtable_empty, NULL);
+	rhashtable_free_and_destroy(&zt->nft_merge_tb,
+				    nfp_check_rhashtable_empty, NULL);
 
 	kfree(zt);
 }