xdp: separate xdp_redirect tracepoint in map case

Creating as specific xdp_redirect_map variant of the xdp tracepoints
allow users to write simpler/faster BPF progs that get attached to
these tracepoints.

Goal is to still keep the tracepoints in xdp_redirect and xdp_redirect_map
similar enough, that a tool can read the top part of the TP_STRUCT and
produce similar monitor statistics.
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/trace/events/xdp.h

@@ -77,13 +77,11 @@ DECLARE_EVENT_CLASS(xdp_redirect_template,
 		__entry->map_index	= map_index;
 	),
 
-	TP_printk("prog_id=%d action=%s ifindex=%d to_ifindex=%d err=%d"
-		  " map_id=%d map_index=%d",
+	TP_printk("prog_id=%d action=%s ifindex=%d to_ifindex=%d err=%d",
 		  __entry->prog_id,
 		  __print_symbolic(__entry->act, __XDP_ACT_SYM_TAB),
 		  __entry->ifindex, __entry->to_ifindex,
-		  __entry->err,
-		  __entry->map_id, __entry->map_index)
+		  __entry->err)
 );
 
 DEFINE_EVENT(xdp_redirect_template, xdp_redirect,
@@ -108,11 +106,43 @@ DEFINE_EVENT(xdp_redirect_template, xdp_redirect_err,
 #define _trace_xdp_redirect_err(dev, xdp, to, err)	\
 	 trace_xdp_redirect_err(dev, xdp, to, err, NULL, 0);
 
-#define trace_xdp_redirect_map(dev, xdp, fwd, map, idx)	\
-	trace_xdp_redirect(dev, xdp, fwd ? fwd->ifindex : 0, 0, map, idx);
+DEFINE_EVENT_PRINT(xdp_redirect_template, xdp_redirect_map,
+	TP_PROTO(const struct net_device *dev,
+		 const struct bpf_prog *xdp,
+		 int to_ifindex, int err,
+		 const struct bpf_map *map, u32 map_index),
+	TP_ARGS(dev, xdp, to_ifindex, err, map, map_index),
+	TP_printk("prog_id=%d action=%s ifindex=%d to_ifindex=%d err=%d"
+		  " map_id=%d map_index=%d",
+		  __entry->prog_id,
+		  __print_symbolic(__entry->act, __XDP_ACT_SYM_TAB),
+		  __entry->ifindex, __entry->to_ifindex,
+		  __entry->err,
+		  __entry->map_id, __entry->map_index)
+);
+
+DEFINE_EVENT_PRINT(xdp_redirect_template, xdp_redirect_map_err,
+	TP_PROTO(const struct net_device *dev,
+		 const struct bpf_prog *xdp,
+		 int to_ifindex, int err,
+		 const struct bpf_map *map, u32 map_index),
+	TP_ARGS(dev, xdp, to_ifindex, err, map, map_index),
+	TP_printk("prog_id=%d action=%s ifindex=%d to_ifindex=%d err=%d"
+		  " map_id=%d map_index=%d",
+		  __entry->prog_id,
+		  __print_symbolic(__entry->act, __XDP_ACT_SYM_TAB),
+		  __entry->ifindex, __entry->to_ifindex,
+		  __entry->err,
+		  __entry->map_id, __entry->map_index)
+);
+
+#define _trace_xdp_redirect_map(dev, xdp, fwd, map, idx)		\
+	 trace_xdp_redirect_map(dev, xdp, fwd ? fwd->ifindex : 0,	\
+				0, map, idx);
 
-#define trace_xdp_redirect_map_err(dev, xdp, fwd, map, idx, err)	\
-	trace_xdp_redirect_err(dev, xdp, fwd ? fwd->ifindex : 0, err, map, idx);
+#define _trace_xdp_redirect_map_err(dev, xdp, fwd, map, idx, err)	\
+	 trace_xdp_redirect_map_err(dev, xdp, fwd ? fwd->ifindex : 0,	\
+				    err, map, idx);
 
 #endif /* _TRACE_XDP_H */
 

net/core/filter.c

@@ -2525,10 +2525,10 @@ static int xdp_do_redirect_map(struct net_device *dev, struct xdp_buff *xdp,
 		goto err;
 
 	ri->map_to_flush = map;
-	trace_xdp_redirect_map(dev, xdp_prog, fwd, map, index);
+	_trace_xdp_redirect_map(dev, xdp_prog, fwd, map, index);
 	return 0;
 err:
-	trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map, index, err);
+	_trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map, index, err);
 	return err;
 }