nfp: flower: detect potential pre-tunnel rules

Pre-tunnel rules are used when the tunnel end-point is on an 'internal
port'. These rules are used to direct the tunnelled packets (based on outer
header fields) to the internal port where they can be detunnelled. The
rule must send the packet to ingress the internal port at the TC layer.

Currently FW does not support an action to send to ingress so cannot
offload such rules. However, in preparation for populating the pre-tunnel
table to represent such rules, check for rules that send to the ingress of
an internal port and mark them as such. Further validation of such rules
is left to subsequent patches.

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

1 files changed, 25 insertions, 0 deletions

diff --git a/drivers/net/ethernet/netronome/nfp/flower/offload.c b/drivers/net/ethernet/netronome/nfp/flower/offload.c
index 607426c02ed3..fba802a02a03 100644
--- a/drivers/net/ethernet/netronome/nfp/flower/offload.c
+++ b/drivers/net/ethernet/netronome/nfp/flower/offload.c
@@ -489,6 +489,7 @@ nfp_flower_allocate_new(struct nfp_fl_key_ls *key_layer)
 	flow_pay->meta.flags = 0;
 	INIT_LIST_HEAD(&flow_pay->linked_flows);
 	flow_pay->in_hw = false;
+	flow_pay->pre_tun_rule.dev = NULL;
 
 	return flow_pay;
 
@@ -997,6 +998,24 @@ err_destroy_merge_flow:
 }
 
 /**
+ * nfp_flower_validate_pre_tun_rule()
+ * @app:	Pointer to the APP handle
+ * @flow:	Pointer to NFP flow representation of rule
+ * @extack:	Netlink extended ACK report
+ *
+ * Verifies the flow as a pre-tunnel rule.
+ *
+ * Return: negative value on error, 0 if verified.
+ */
+static int
+nfp_flower_validate_pre_tun_rule(struct nfp_app *app,
+				 struct nfp_fl_payload *flow,
+				 struct netlink_ext_ack *extack)
+{
+	return -EOPNOTSUPP;
+}
+
+/**
  * nfp_flower_add_offload() - Adds a new flow to hardware.
  * @app:	Pointer to the APP handle
  * @netdev:	netdev structure.
@@ -1046,6 +1065,12 @@ nfp_flower_add_offload(struct nfp_app *app, struct net_device *netdev,
 	if (err)
 		goto err_destroy_flow;
 
+	if (flow_pay->pre_tun_rule.dev) {
+		err = nfp_flower_validate_pre_tun_rule(app, flow_pay, extack);
+		if (err)
+			goto err_destroy_flow;
+	}
+
 	err = nfp_compile_flow_metadata(app, flow, flow_pay, netdev, extack);
 	if (err)
 		goto err_destroy_flow;