IB/core: Introduce drop flow specification

This flow steering specification identifies flow for drop by the HW.
If user create a flow only with the drop specification,
then all the packets that hit this flow will be dropped, otherwise the HW
will drop only the packets that match the other L2/L3/L4 specifications.
Signed-off-by: Slava Shwartsman <slavash@mellanox.com>
Reviewed-by: Maor Gottlieb <maorg@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/core/uverbs.h

@@ -233,6 +233,7 @@ struct ib_uverbs_flow_spec {
 		struct ib_uverbs_flow_spec_tcp_udp tcp_udp;
 		struct ib_uverbs_flow_spec_ipv6    ipv6;
 		struct ib_uverbs_flow_spec_action_tag	flow_tag;
+		struct ib_uverbs_flow_spec_action_drop	drop;
 	};
 };
 

drivers/infiniband/core/uverbs_cmd.c

@@ -2689,6 +2689,13 @@ static int kern_spec_to_ib_spec_action(struct ib_uverbs_flow_spec *kern_spec,
 		ib_spec->flow_tag.size = sizeof(struct ib_flow_spec_action_tag);
 		ib_spec->flow_tag.tag_id = kern_spec->flow_tag.tag_id;
 		break;
+	case IB_FLOW_SPEC_ACTION_DROP:
+		if (kern_spec->drop.size !=
+		    sizeof(struct ib_uverbs_flow_spec_action_drop))
+			return -EINVAL;
+
+		ib_spec->drop.size = sizeof(struct ib_flow_spec_action_drop);
+		break;
 	default:
 		return -EINVAL;
 	}

include/rdma/ib_verbs.h

@@ -1679,6 +1679,7 @@ enum ib_flow_spec_type {
 	IB_FLOW_SPEC_INNER		= 0x100,
 	/* Actions */
 	IB_FLOW_SPEC_ACTION_TAG         = 0x1000,
+	IB_FLOW_SPEC_ACTION_DROP        = 0x1001,
 };
 #define IB_FLOW_SPEC_LAYER_MASK	0xF0
 #define IB_FLOW_SPEC_SUPPORT_LAYERS 8
@@ -1807,6 +1808,11 @@ struct ib_flow_spec_action_tag {
 	u32                           tag_id;
 };
 
+struct ib_flow_spec_action_drop {
+	enum ib_flow_spec_type	      type;
+	u16			      size;
+};
+
 union ib_flow_spec {
 	struct {
 		u32			type;
@@ -1819,6 +1825,7 @@ union ib_flow_spec {
 	struct ib_flow_spec_ipv6        ipv6;
 	struct ib_flow_spec_tunnel      tunnel;
 	struct ib_flow_spec_action_tag  flow_tag;
+	struct ib_flow_spec_action_drop drop;
 };
 
 struct ib_flow_attr {

include/uapi/rdma/ib_user_verbs.h

@@ -947,6 +947,17 @@ struct ib_uverbs_flow_spec_action_tag {
 	__u32			      reserved1;
 };
 
+struct ib_uverbs_flow_spec_action_drop {
+	union {
+		struct ib_uverbs_flow_spec_hdr hdr;
+		struct {
+			__u32 type;
+			__u16 size;
+			__u16 reserved;
+		};
+	};
+};
+
 struct ib_uverbs_flow_tunnel_filter {
 	__be32 tunnel_id;
 };