mlxsw: spectrum_acl: Add C-TCAM spill tracepoint

Add some visibility to the rule addition process and trace whenever rule
spilled into C-TCAM.
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_atcam.c

@@ -7,6 +7,8 @@
 #include <linux/gfp.h>
 #include <linux/refcount.h>
 #include <linux/rhashtable.h>
+#define CREATE_TRACE_POINTS
+#include <trace/events/mlxsw.h>
 
 #include "reg.h"
 #include "core.h"
@@ -578,6 +580,7 @@ int mlxsw_sp_acl_atcam_entry_add(struct mlxsw_sp *mlxsw_sp,
 	/* It is possible we failed to add the rule to the A-TCAM due to
 	 * exceeded number of masks. Try to spill into C-TCAM.
 	 */
+	trace_mlxsw_sp_acl_atcam_entry_add_ctcam_spill(mlxsw_sp, aregion);
 	err = mlxsw_sp_acl_ctcam_entry_add(mlxsw_sp, &aregion->cregion,
 					   &achunk->cchunk, &aentry->centry,
 					   rulei, true);

include/trace/events/mlxsw.h

+/* SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 */
+/* Copyright (c) 2019 Mellanox Technologies. All rights reserved */
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM mlxsw
+
+#if !defined(_MLXSW_TRACEPOINT_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _MLXSW_TRACEPOINT_H
+
+#include <linux/tracepoint.h>
+
+struct mlxsw_sp;
+struct mlxsw_sp_acl_atcam_region;
+
+TRACE_EVENT(mlxsw_sp_acl_atcam_entry_add_ctcam_spill,
+	TP_PROTO(const struct mlxsw_sp *mlxsw_sp,
+		 const struct mlxsw_sp_acl_atcam_region *aregion),
+
+	TP_ARGS(mlxsw_sp, aregion),
+
+	TP_STRUCT__entry(
+		__field(const void *, mlxsw_sp)
+		__field(const void *, aregion)
+	),
+
+	TP_fast_assign(
+		__entry->mlxsw_sp = mlxsw_sp;
+		__entry->aregion = aregion;
+	),
+
+	TP_printk("mlxsw_sp %p, aregion %p",
+		  __entry->mlxsw_sp, __entry->aregion)
+);
+
+#endif /* _MLXSW_TRACEPOINT_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>