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Jesper Dangaard Brouer
8d3b778ff5
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 <[email protected]> Signed-off-by: David S. Miller <[email protected]>
108 lines
2.7 KiB
C
108 lines
2.7 KiB
C
#undef TRACE_SYSTEM
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#define TRACE_SYSTEM xdp
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#if !defined(_TRACE_XDP_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_XDP_H
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#include <linux/netdevice.h>
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#include <linux/filter.h>
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#include <linux/tracepoint.h>
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#define __XDP_ACT_MAP(FN) \
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FN(ABORTED) \
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FN(DROP) \
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FN(PASS) \
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FN(TX) \
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FN(REDIRECT)
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#define __XDP_ACT_TP_FN(x) \
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TRACE_DEFINE_ENUM(XDP_##x);
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#define __XDP_ACT_SYM_FN(x) \
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{ XDP_##x, #x },
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#define __XDP_ACT_SYM_TAB \
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__XDP_ACT_MAP(__XDP_ACT_SYM_FN) { -1, 0 }
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__XDP_ACT_MAP(__XDP_ACT_TP_FN)
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TRACE_EVENT(xdp_exception,
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TP_PROTO(const struct net_device *dev,
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const struct bpf_prog *xdp, u32 act),
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TP_ARGS(dev, xdp, act),
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TP_STRUCT__entry(
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__array(u8, prog_tag, 8)
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__field(u32, act)
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__field(int, ifindex)
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),
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TP_fast_assign(
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BUILD_BUG_ON(sizeof(__entry->prog_tag) != sizeof(xdp->tag));
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memcpy(__entry->prog_tag, xdp->tag, sizeof(xdp->tag));
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__entry->act = act;
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__entry->ifindex = dev->ifindex;
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),
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TP_printk("prog=%s action=%s ifindex=%d",
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__print_hex_str(__entry->prog_tag, 8),
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__print_symbolic(__entry->act, __XDP_ACT_SYM_TAB),
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__entry->ifindex)
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);
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DECLARE_EVENT_CLASS(xdp_redirect_template,
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TP_PROTO(const struct net_device *dev,
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const struct bpf_prog *xdp,
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int to_ifindex, int err,
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const struct bpf_map *map, u32 map_index),
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TP_ARGS(dev, xdp, to_ifindex, err, map, map_index),
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TP_STRUCT__entry(
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__array(u8, prog_tag, 8)
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__field(u32, act)
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__field(int, ifindex)
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__field(int, err)
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__field(int, to_ifindex)
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__field(u32, map_id)
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__field(int, map_index)
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),
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TP_fast_assign(
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BUILD_BUG_ON(sizeof(__entry->prog_tag) != sizeof(xdp->tag));
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memcpy(__entry->prog_tag, xdp->tag, sizeof(xdp->tag));
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__entry->act = XDP_REDIRECT;
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__entry->ifindex = dev->ifindex;
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__entry->err = err;
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__entry->to_ifindex = to_ifindex;
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__entry->map_id = map ? map->id : 0;
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__entry->map_index = map_index;
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),
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TP_printk("prog=%s action=%s ifindex=%d to_ifindex=%d err=%d"
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" map_id=%d map_index=%d",
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__print_hex_str(__entry->prog_tag, 8),
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__print_symbolic(__entry->act, __XDP_ACT_SYM_TAB),
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__entry->ifindex, __entry->to_ifindex,
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__entry->err,
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__entry->map_id, __entry->map_index)
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);
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DEFINE_EVENT(xdp_redirect_template, xdp_redirect,
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TP_PROTO(const struct net_device *dev,
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const struct bpf_prog *xdp,
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int to_ifindex, int err,
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const struct bpf_map *map, u32 map_index),
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TP_ARGS(dev, xdp, to_ifindex, err, map, map_index)
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);
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#define _trace_xdp_redirect(dev, xdp, to, err) \
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trace_xdp_redirect(dev, xdp, to, err, NULL, 0);
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#define trace_xdp_redirect_map(dev, xdp, fwd, err, map, idx) \
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trace_xdp_redirect(dev, xdp, fwd ? fwd->ifindex : 0, err, map, idx);
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#endif /* _TRACE_XDP_H */
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#include <trace/define_trace.h>
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