nfp: flower-ct: add delete flow handling for ct

Add functions to handle delete flow callbacks for ct flows. Also
accept the flows for offloading by returning 0 instead of -EOPNOTSUPP.
Flows will still not actually be offloaded to hw, but at this point
it's difficult to not accept the flows and also exercise the cleanup
paths properly. Traffic will still be handled safely through the
fallback path.
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

@@ -424,8 +424,7 @@ int nfp_fl_ct_handle_pre_ct(struct nfp_flower_priv *priv,
 	if (priv->ct_zone_wc)
 		nfp_ct_merge_tc_entries(ct_entry, priv->ct_zone_wc, zt);
 
-	NL_SET_ERR_MSG_MOD(extack, "unsupported offload: Conntrack action not supported");
-	return -EOPNOTSUPP;
+	return 0;
 }
 
 int nfp_fl_ct_handle_post_ct(struct nfp_flower_priv *priv,
@@ -487,6 +486,37 @@ int nfp_fl_ct_handle_post_ct(struct nfp_flower_priv *priv,
 		nfp_ct_merge_tc_entries(ct_entry, zt, zt);
 	}
 
-	NL_SET_ERR_MSG_MOD(extack, "unsupported offload: Conntrack match not supported");
-	return -EOPNOTSUPP;
+	return 0;
+}
+
+int nfp_fl_ct_del_flow(struct nfp_fl_ct_map_entry *ct_map_ent)
+{
+	struct nfp_fl_ct_flow_entry *ct_entry;
+	struct nfp_fl_ct_zone_entry *zt;
+	struct rhashtable *m_table;
+
+	zt = ct_map_ent->ct_entry->zt;
+	ct_entry = ct_map_ent->ct_entry;
+	m_table = &zt->priv->ct_map_table;
+
+	switch (ct_entry->type) {
+	case CT_TYPE_PRE_CT:
+		zt->pre_ct_count--;
+		rhashtable_remove_fast(m_table, &ct_map_ent->hash_node,
+				       nfp_ct_map_params);
+		nfp_fl_ct_clean_flow_entry(ct_entry);
+		kfree(ct_map_ent);
+		break;
+	case CT_TYPE_POST_CT:
+		zt->post_ct_count--;
+		rhashtable_remove_fast(m_table, &ct_map_ent->hash_node,
+				       nfp_ct_map_params);
+		nfp_fl_ct_clean_flow_entry(ct_entry);
+		kfree(ct_map_ent);
+		break;
+	default:
+		break;
+	}
+
+	return 0;
 }

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

@@ -152,4 +152,10 @@ int nfp_fl_ct_handle_post_ct(struct nfp_flower_priv *priv,
  * @entry:	Flow entry to cleanup
  */
 void nfp_fl_ct_clean_flow_entry(struct nfp_fl_ct_flow_entry *entry);
+
+/**
+ * nfp_fl_ct_del_flow() - Handle flow_del callbacks for conntrack
+ * @ct_map_ent:	ct map entry for the flow that needs deleting
+ */
+int nfp_fl_ct_del_flow(struct nfp_fl_ct_map_entry *ct_map_ent);
 #endif

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

@@ -1505,6 +1505,7 @@ nfp_flower_del_offload(struct nfp_app *app, struct net_device *netdev,
 		       struct flow_cls_offload *flow)
 {
 	struct nfp_flower_priv *priv = app->priv;
+	struct nfp_fl_ct_map_entry *ct_map_ent;
 	struct netlink_ext_ack *extack = NULL;
 	struct nfp_fl_payload *nfp_flow;
 	struct nfp_port *port = NULL;
@@ -1514,6 +1515,14 @@ nfp_flower_del_offload(struct nfp_app *app, struct net_device *netdev,
 	if (nfp_netdev_is_nfp_repr(netdev))
 		port = nfp_port_from_netdev(netdev);
 
+	/* Check ct_map_table */
+	ct_map_ent = rhashtable_lookup_fast(&priv->ct_map_table, &flow->cookie,
+					    nfp_ct_map_params);
+	if (ct_map_ent) {
+		err = nfp_fl_ct_del_flow(ct_map_ent);
+		return err;
+	}
+
 	nfp_flow = nfp_flower_search_fl_table(app, flow->cookie, netdev);
 	if (!nfp_flow) {
 		NL_SET_ERR_MSG_MOD(extack, "invalid entry: cannot remove flow that does not exist");