nfp: flower: remove unnecessary code in flow lookup

Recent changes to NFP mean that stats updates from fw to driver no longer
require a flow lookup and (because egdev offload has been removed) the
ingress netdev for a lookup is now always known.

Remove obsolete code in a flow lookup that matches on host context and
that allows for a netdev to be NULL.

Signed-off-by: John Hurley <john.hurley@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -20,7 +20,6 @@ struct nfp_fl_pre_lag;
 struct net_device;
 struct nfp_app;
 
-#define NFP_FL_STATS_CTX_DONT_CARE	cpu_to_be32(0xffffffff)
 #define NFP_FL_STATS_ELEM_RS		FIELD_SIZEOF(struct nfp_fl_stats_id, \
 						     init_unalloc)
 #define NFP_FLOWER_MASK_ENTRY_RS	256
@@ -242,7 +241,7 @@ int nfp_modify_flow_metadata(struct nfp_app *app,
 
 struct nfp_fl_payload *
 nfp_flower_search_fl_table(struct nfp_app *app, unsigned long tc_flower_cookie,
-			   struct net_device *netdev, __be32 host_ctx);
+			   struct net_device *netdev);
 struct nfp_fl_payload *
 nfp_flower_remove_fl_table(struct nfp_app *app, unsigned long tc_flower_cookie);
 

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

@@ -21,7 +21,6 @@ struct nfp_mask_id_table {
 struct nfp_fl_flow_table_cmp_arg {
 	struct net_device *netdev;
 	unsigned long cookie;
-	__be32 host_ctx;
 };
 
 static int nfp_release_stats_entry(struct nfp_app *app, u32 stats_context_id)
@@ -76,14 +75,13 @@ static int nfp_get_stats_entry(struct nfp_app *app, u32 *stats_context_id)
 /* Must be called with either RTNL or rcu_read_lock */
 struct nfp_fl_payload *
 nfp_flower_search_fl_table(struct nfp_app *app, unsigned long tc_flower_cookie,
-			   struct net_device *netdev, __be32 host_ctx)
+			   struct net_device *netdev)
 {
 	struct nfp_fl_flow_table_cmp_arg flower_cmp_arg;
 	struct nfp_flower_priv *priv = app->priv;
 
 	flower_cmp_arg.netdev = netdev;
 	flower_cmp_arg.cookie = tc_flower_cookie;
-	flower_cmp_arg.host_ctx = host_ctx;
 
 	return rhashtable_lookup_fast(&priv->flow_table, &flower_cmp_arg,
 				      nfp_flower_table_params);
@@ -307,8 +305,7 @@ int nfp_compile_flow_metadata(struct nfp_app *app,
 	priv->stats[stats_cxt].bytes = 0;
 	priv->stats[stats_cxt].used = jiffies;
 
-	check_entry = nfp_flower_search_fl_table(app, flow->cookie, netdev,
-						 NFP_FL_STATS_CTX_DONT_CARE);
+	check_entry = nfp_flower_search_fl_table(app, flow->cookie, netdev);
 	if (check_entry) {
 		if (nfp_release_stats_entry(app, stats_cxt))
 			return -EINVAL;
@@ -353,9 +350,7 @@ static int nfp_fl_obj_cmpfn(struct rhashtable_compare_arg *arg,
 	const struct nfp_fl_flow_table_cmp_arg *cmp_arg = arg->key;
 	const struct nfp_fl_payload *flow_entry = obj;
 
-	if ((!cmp_arg->netdev || flow_entry->ingress_dev == cmp_arg->netdev) &&
-	    (cmp_arg->host_ctx == NFP_FL_STATS_CTX_DONT_CARE ||
-	     flow_entry->meta.host_ctx_id == cmp_arg->host_ctx))
+	if (flow_entry->ingress_dev == cmp_arg->netdev)
 		return flow_entry->tc_flower_cookie != cmp_arg->cookie;
 
 	return 1;

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

@@ -512,8 +512,7 @@ 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);
 
-	nfp_flow = nfp_flower_search_fl_table(app, flow->cookie, netdev,
-					      NFP_FL_STATS_CTX_DONT_CARE);
+	nfp_flow = nfp_flower_search_fl_table(app, flow->cookie, netdev);
 	if (!nfp_flow)
 		return -ENOENT;
 
@@ -561,8 +560,7 @@ nfp_flower_get_stats(struct nfp_app *app, struct net_device *netdev,
 	struct nfp_fl_payload *nfp_flow;
 	u32 ctx_id;
 
-	nfp_flow = nfp_flower_search_fl_table(app, flow->cookie, netdev,
-					      NFP_FL_STATS_CTX_DONT_CARE);
+	nfp_flow = nfp_flower_search_fl_table(app, flow->cookie, netdev);
 	if (!nfp_flow)
 		return -EINVAL;