4c03bdd7b5
The return error code need to be included in the tracepoint xdp:xdp_redirect, else its not possible to distinguish successful or failed XDP_REDIRECT transmits. XDP have no queuing mechanism. Thus, it is fairly easily to overrun a NIC transmit queue. The eBPF program invoking helpers (bpf_redirect or bpf_redirect_map) to redirect a packet doesn't get any feedback whether the packet was actually transmitted. Info on failed transmits in the tracepoint xdp:xdp_redirect, is interesting as this opens for providing a feedback-loop to the receiving XDP program. Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
86 lines
2.0 KiB
C
86 lines
2.0 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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__string(name, dev->name)
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__array(u8, prog_tag, 8)
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__field(u32, act)
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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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__assign_str(name, dev->name);
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__entry->act = act;
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),
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TP_printk("prog=%s device=%s action=%s",
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__print_hex_str(__entry->prog_tag, 8),
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__get_str(name),
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__print_symbolic(__entry->act, __XDP_ACT_SYM_TAB))
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);
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TRACE_EVENT(xdp_redirect,
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TP_PROTO(const struct net_device *from,
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const struct net_device *to,
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const struct bpf_prog *xdp, u32 act, int err),
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TP_ARGS(from, to, xdp, act, err),
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TP_STRUCT__entry(
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__string(name_from, from->name)
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__string(name_to, to->name)
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__array(u8, prog_tag, 8)
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__field(u32, act)
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__field(int, err)
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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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__assign_str(name_from, from->name);
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__assign_str(name_to, to->name);
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__entry->act = act;
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__entry->err = err;
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),
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TP_printk("prog=%s from=%s to=%s action=%s err=%d",
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__print_hex_str(__entry->prog_tag, 8),
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__get_str(name_from), __get_str(name_to),
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__print_symbolic(__entry->act, __XDP_ACT_SYM_TAB),
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__entry->err)
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);
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#endif /* _TRACE_XDP_H */
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#include <trace/define_trace.h>
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