From: Jesper Dangaard Brouer <brouer@redhat.com>
Date: Tue, 29 Aug 2017 16:37:45 +0200
Subject: xdp: tracepoint xdp_redirect also need a map argument
Patch-mainline: v4.14-rc1
Git-commit: 8d3b778ff544b369f0847e6c15f3e73057298aa4
References: bsc#1109837
To make sense of the map index, the tracepoint user also need to know
that map we are talking about. Supply the map pointer but only expose
the map->id.
The 'to_index' is renamed 'to_ifindex'. In the xdp_redirect_map case,
this is the result of the devmap lookup. The map lookup key is exposed
as map_index, which is needed to troubleshoot in case the lookup failed.
The 'to_ifindex' is placed after 'err' to keep TP_STRUCT as common as
possible.
This also keeps the TP_STRUCT similar enough, that userspace can write
a monitor program, that doesn't need to care about whether
bpf_redirect or bpf_redirect_map were used.
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
include/trace/events/xdp.h | 38 ++++++++++++++++++++++++++++++--------
net/core/filter.c | 6 +++---
2 files changed, 33 insertions(+), 11 deletions(-)
--- a/include/trace/events/xdp.h
+++ b/include/trace/events/xdp.h
@@ -49,20 +49,23 @@ TRACE_EVENT(xdp_exception,
__entry->ifindex)
);
-TRACE_EVENT(xdp_redirect,
+DECLARE_EVENT_CLASS(xdp_redirect_template,
TP_PROTO(const struct net_device *dev,
const struct bpf_prog *xdp,
- int to_index, int err),
+ int to_ifindex, int err,
+ const struct bpf_map *map, u32 map_index),
- TP_ARGS(dev, xdp, to_index, err),
+ TP_ARGS(dev, xdp, to_ifindex, err, map, map_index),
TP_STRUCT__entry(
__array(u8, prog_tag, 8)
__field(u32, act)
__field(int, ifindex)
- __field(int, to_index)
__field(int, err)
+ __field(int, to_ifindex)
+ __field(u32, map_id)
+ __field(int, map_index)
),
TP_fast_assign(
@@ -70,16 +73,35 @@ TRACE_EVENT(xdp_redirect,
memcpy(__entry->prog_tag, xdp->tag, sizeof(xdp->tag));
__entry->act = XDP_REDIRECT;
__entry->ifindex = dev->ifindex;
- __entry->to_index = to_index;
__entry->err = err;
+ __entry->to_ifindex = to_ifindex;
+ __entry->map_id = map ? map->id : 0;
+ __entry->map_index = map_index;
),
- TP_printk("prog=%s action=%s ifindex=%d to_index=%d err=%d",
+ TP_printk("prog=%s action=%s ifindex=%d to_ifindex=%d err=%d"
+ " map_id=%d map_index=%d",
__print_hex_str(__entry->prog_tag, 8),
__print_symbolic(__entry->act, __XDP_ACT_SYM_TAB),
- __entry->ifindex, __entry->to_index,
- __entry->err)
+ __entry->ifindex, __entry->to_ifindex,
+ __entry->err,
+ __entry->map_id, __entry->map_index)
);
+
+DEFINE_EVENT(xdp_redirect_template, xdp_redirect,
+ 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)
+);
+
+#define _trace_xdp_redirect(dev, xdp, to, err) \
+ trace_xdp_redirect(dev, xdp, to, err, NULL, 0);
+
+#define trace_xdp_redirect_map(dev, xdp, fwd, err, map, idx) \
+ trace_xdp_redirect(dev, xdp, fwd ? fwd->ifindex : 0, err, map, idx);
+
#endif /* _TRACE_XDP_H */
#include <trace/define_trace.h>
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -2524,7 +2524,7 @@ static int xdp_do_redirect_map(struct ne
if (likely(!err))
ri->map_to_flush = map;
out:
- trace_xdp_redirect(dev, xdp_prog, index, err);
+ trace_xdp_redirect_map(dev, xdp_prog, fwd, err, map, index);
return err;
}
@@ -2548,7 +2548,7 @@ int xdp_do_redirect(struct net_device *d
err = __bpf_tx_xdp(fwd, NULL, xdp, 0);
out:
- trace_xdp_redirect(dev, xdp_prog, index, err);
+ _trace_xdp_redirect(dev, xdp_prog, index, err);
return err;
}
EXPORT_SYMBOL_GPL(xdp_do_redirect);
@@ -2582,7 +2582,7 @@ int xdp_do_generic_redirect(struct net_d
skb->dev = fwd;
out:
- trace_xdp_redirect(dev, xdp_prog, index, err);
+ _trace_xdp_redirect(dev, xdp_prog, index, err);
return err;
}
EXPORT_SYMBOL_GPL(xdp_do_generic_redirect);