nfp: flower: support offloading multiple rules with same cookie

When multiple netdevs are attached to a tc offload block and register for
callbacks, a rule added to the block will be propogated to all netdevs.
Previously these were detected as duplicates (based on cookie) and
rejected. Modify the rule nfp lookup function to optionally include an
ingress netdev and a host context along with the cookie value when
searching for a rule. When a new rule is passed to the driver, the netdev
the rule is to be attached to is considered when searching for dublicates.
When a stats update is received from HW, the host context is used
alongside the cookie to map to the correct host rule.

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

@@ -47,6 +47,7 @@
 struct net_device;
 struct nfp_app;
 
+#define NFP_FL_STATS_CTX_DONT_CARE	cpu_to_be32(0xffffffff)
 #define NFP_FL_STATS_ENTRY_RS		BIT(20)
 #define NFP_FL_STATS_ELEM_RS		4
 #define NFP_FL_REPEATED_HASH_MAX	BIT(17)
@@ -189,6 +190,7 @@ struct nfp_fl_payload {
 	spinlock_t lock; /* lock stats */
 	struct nfp_fl_stats stats;
 	__be32 nfp_tun_ipv4_addr;
+	struct net_device *ingress_dev;
 	char *unmasked_data;
 	char *mask_data;
 	char *action_data;
@@ -216,12 +218,14 @@ int nfp_flower_compile_action(struct tc_cls_flower_offload *flow,
 			      struct nfp_fl_payload *nfp_flow);
 int nfp_compile_flow_metadata(struct nfp_app *app,
 			      struct tc_cls_flower_offload *flow,
-			      struct nfp_fl_payload *nfp_flow);
+			      struct nfp_fl_payload *nfp_flow,
+			      struct net_device *netdev);
 int nfp_modify_flow_metadata(struct nfp_app *app,
 			     struct nfp_fl_payload *nfp_flow);
 
 struct nfp_fl_payload *
-nfp_flower_search_fl_table(struct nfp_app *app, unsigned long tc_flower_cookie);
+nfp_flower_search_fl_table(struct nfp_app *app, unsigned long tc_flower_cookie,
+			   struct net_device *netdev, __be32 host_ctx);
 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

@@ -99,14 +99,18 @@ 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)
+nfp_flower_search_fl_table(struct nfp_app *app, unsigned long tc_flower_cookie,
+			   struct net_device *netdev, __be32 host_ctx)
 {
 	struct nfp_flower_priv *priv = app->priv;
 	struct nfp_fl_payload *flower_entry;
 
 	hash_for_each_possible_rcu(priv->flow_table, flower_entry, link,
 				   tc_flower_cookie)
-		if (flower_entry->tc_flower_cookie == tc_flower_cookie)
+		if (flower_entry->tc_flower_cookie == tc_flower_cookie &&
+		    (!netdev || flower_entry->ingress_dev == netdev) &&
+		    (host_ctx == NFP_FL_STATS_CTX_DONT_CARE ||
+		     flower_entry->meta.host_ctx_id == host_ctx))
 			return flower_entry;
 
 	return NULL;
@@ -121,13 +125,11 @@ nfp_flower_update_stats(struct nfp_app *app, struct nfp_fl_stats_frame *stats)
 	flower_cookie = be64_to_cpu(stats->stats_cookie);
 
 	rcu_read_lock();
-	nfp_flow = nfp_flower_search_fl_table(app, flower_cookie);
+	nfp_flow = nfp_flower_search_fl_table(app, flower_cookie, NULL,
+					      stats->stats_con_id);
 	if (!nfp_flow)
 		goto exit_rcu_unlock;
 
-	if (nfp_flow->meta.host_ctx_id != stats->stats_con_id)
-		goto exit_rcu_unlock;
-
 	spin_lock(&nfp_flow->lock);
 	nfp_flow->stats.pkts += be32_to_cpu(stats->pkt_count);
 	nfp_flow->stats.bytes += be64_to_cpu(stats->byte_count);
@@ -317,7 +319,8 @@ nfp_check_mask_remove(struct nfp_app *app, char *mask_data, u32 mask_len,
 
 int nfp_compile_flow_metadata(struct nfp_app *app,
 			      struct tc_cls_flower_offload *flow,
-			      struct nfp_fl_payload *nfp_flow)
+			      struct nfp_fl_payload *nfp_flow,
+			      struct net_device *netdev)
 {
 	struct nfp_flower_priv *priv = app->priv;
 	struct nfp_fl_payload *check_entry;
@@ -348,7 +351,8 @@ int nfp_compile_flow_metadata(struct nfp_app *app,
 	nfp_flow->stats.bytes = 0;
 	nfp_flow->stats.used = jiffies;
 
-	check_entry = nfp_flower_search_fl_table(app, flow->cookie);
+	check_entry = nfp_flower_search_fl_table(app, flow->cookie, netdev,
+						 NFP_FL_STATS_CTX_DONT_CARE);
 	if (check_entry) {
 		if (nfp_release_stats_entry(app, stats_cxt))
 			return -EINVAL;

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

@@ -419,6 +419,8 @@ nfp_flower_add_offload(struct nfp_app *app, struct net_device *netdev,
 		goto err_free_key_ls;
 	}
 
+	flow_pay->ingress_dev = egress ? NULL : netdev;
+
 	err = nfp_flower_compile_flow_match(flow, key_layer, netdev, flow_pay,
 					    tun_type);
 	if (err)
@@ -428,7 +430,8 @@ nfp_flower_add_offload(struct nfp_app *app, struct net_device *netdev,
 	if (err)
 		goto err_destroy_flow;
 
-	err = nfp_compile_flow_metadata(app, flow, flow_pay);
+	err = nfp_compile_flow_metadata(app, flow, flow_pay,
+					flow_pay->ingress_dev);
 	if (err)
 		goto err_destroy_flow;
 
@@ -462,6 +465,7 @@ err_free_key_ls:
  * @app:	Pointer to the APP handle
  * @netdev:	netdev structure.
  * @flow:	TC flower classifier offload structure
+ * @egress:	Netdev is the egress dev.
  *
  * Removes a flow from the repeated hash structure and clears the
  * action payload.
@@ -470,13 +474,16 @@ err_free_key_ls:
  */
 static int
 nfp_flower_del_offload(struct nfp_app *app, struct net_device *netdev,
-		       struct tc_cls_flower_offload *flow)
+		       struct tc_cls_flower_offload *flow, bool egress)
 {
 	struct nfp_port *port = nfp_port_from_netdev(netdev);
 	struct nfp_fl_payload *nfp_flow;
+	struct net_device *ingr_dev;
 	int err;
 
-	nfp_flow = nfp_flower_search_fl_table(app, flow->cookie);
+	ingr_dev = egress ? NULL : netdev;
+	nfp_flow = nfp_flower_search_fl_table(app, flow->cookie, ingr_dev,
+					      NFP_FL_STATS_CTX_DONT_CARE);
 	if (!nfp_flow)
 		return -ENOENT;
 
@@ -505,7 +512,9 @@ err_free_flow:
 /**
  * nfp_flower_get_stats() - Populates flow stats obtained from hardware.
  * @app:	Pointer to the APP handle
+ * @netdev:	Netdev structure.
  * @flow:	TC flower classifier offload structure
+ * @egress:	Netdev is the egress dev.
  *
  * Populates a flow statistics structure which which corresponds to a
  * specific flow.
@@ -513,11 +522,15 @@ err_free_flow:
  * Return: negative value on error, 0 if stats populated successfully.
  */
 static int
-nfp_flower_get_stats(struct nfp_app *app, struct tc_cls_flower_offload *flow)
+nfp_flower_get_stats(struct nfp_app *app, struct net_device *netdev,
+		     struct tc_cls_flower_offload *flow, bool egress)
 {
 	struct nfp_fl_payload *nfp_flow;
+	struct net_device *ingr_dev;
 
-	nfp_flow = nfp_flower_search_fl_table(app, flow->cookie);
+	ingr_dev = egress ? NULL : netdev;
+	nfp_flow = nfp_flower_search_fl_table(app, flow->cookie, ingr_dev,
+					      NFP_FL_STATS_CTX_DONT_CARE);
 	if (!nfp_flow)
 		return -EINVAL;
 
@@ -543,9 +556,9 @@ nfp_flower_repr_offload(struct nfp_app *app, struct net_device *netdev,
 	case TC_CLSFLOWER_REPLACE:
 		return nfp_flower_add_offload(app, netdev, flower, egress);
 	case TC_CLSFLOWER_DESTROY:
-		return nfp_flower_del_offload(app, netdev, flower);
+		return nfp_flower_del_offload(app, netdev, flower, egress);
 	case TC_CLSFLOWER_STATS:
-		return nfp_flower_get_stats(app, flower);
+		return nfp_flower_get_stats(app, netdev, flower, egress);
 	}
 
 	return -EOPNOTSUPP;