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Date: Mon, 8 Feb 2021 09:11:45 +0000
From: "Loftus, Ciara" <ciara.loftus@...el.com>
To: Song Liu <song@...nel.org>
CC: Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
"Karlsson, Magnus" <magnus.karlsson@...el.com>,
"bjorn@...nel.org" <bjorn@...nel.org>,
"Janjua, Weqaar A" <weqaar.a.janjua@...el.com>,
Daniel Borkmann <daniel@...earbox.net>
Subject: RE: [PATCH bpf-next v4 1/6] xsk: add tracepoints for packet drops
> >
> > This commit introduces tracing infrastructure for AF_XDP sockets
> > (xsks) and a new trace event called 'xsk_packet_drop'. This trace
> > event is triggered when a packet cannot be processed by the socket
> > due to one of the following issues:
> > (1) packet exceeds the maximum permitted size.
> > (2) invalid fill descriptor address.
> > (3) invalid tx descriptor field.
> >
> > The trace provides information about the error to the user. For
> > example the size vs permitted size is provided for (1). For (2)
> > and (3) the relevant descriptor fields are printed. This information
> > should help a user troubleshoot packet drops by providing this extra
> > level of detail which is not available through use of simple counters.
> >
> > The tracepoint can be enabled/disabled by toggling
> > /sys/kernel/debug/tracing/events/xsk/xsk_packet_drop/enable
> >
> > Signed-off-by: Ciara Loftus <ciara.loftus@...el.com>
> > ---
> > MAINTAINERS | 1 +
> > include/linux/bpf_trace.h | 1 +
> > include/trace/events/xsk.h | 73
> +++++++++++++++++++++++++++++++
> > include/uapi/linux/if_xdp.h | 6 +++
> > kernel/bpf/core.c | 1 +
> > net/xdp/xsk.c | 7 ++-
> > net/xdp/xsk_buff_pool.c | 3 ++
> > net/xdp/xsk_queue.h | 4 ++
> > tools/include/uapi/linux/if_xdp.h | 6 +++
> > 9 files changed, 101 insertions(+), 1 deletion(-)
> > create mode 100644 include/trace/events/xsk.h
> >
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index 1df56a32d2df..efe6662d4198 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -19440,6 +19440,7 @@ S: Maintained
> > F: Documentation/networking/af_xdp.rst
> > F: include/net/xdp_sock*
> > F: include/net/xsk_buff_pool.h
> > +F: include/trace/events/xsk.h
> > F: include/uapi/linux/if_xdp.h
> > F: include/uapi/linux/xdp_diag.h
> > F: include/net/netns/xdp.h
> > diff --git a/include/linux/bpf_trace.h b/include/linux/bpf_trace.h
> > index ddf896abcfb6..477d29b6c2c1 100644
> > --- a/include/linux/bpf_trace.h
> > +++ b/include/linux/bpf_trace.h
> > @@ -3,5 +3,6 @@
> > #define __LINUX_BPF_TRACE_H__
> >
> > #include <trace/events/xdp.h>
> > +#include <trace/events/xsk.h>
> >
> > #endif /* __LINUX_BPF_TRACE_H__ */
> > diff --git a/include/trace/events/xsk.h b/include/trace/events/xsk.h
> > new file mode 100644
> > index 000000000000..e2984fad372c
> > --- /dev/null
> > +++ b/include/trace/events/xsk.h
> > @@ -0,0 +1,73 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/* Copyright(c) 2021 Intel Corporation. */
> > +
> > +#undef TRACE_SYSTEM
> > +#define TRACE_SYSTEM xsk
> > +
> > +#if !defined(_TRACE_XSK_H) || defined(TRACE_HEADER_MULTI_READ)
> > +#define _TRACE_XSK_H
> > +
> > +#include <linux/if_xdp.h>
> > +#include <linux/tracepoint.h>
> > +
> > +#define print_reason(reason) \
> > + __print_symbolic(reason, \
> > + { XSK_TRACE_DROP_PKT_TOO_BIG, "packet too big" }, \
> > + { XSK_TRACE_DROP_INVALID_FILLADDR, "invalid fill addr" }, \
> > + { XSK_TRACE_DROP_INVALID_TXD, "invalid tx desc" })
> > +
> > +#define print_val1(reason) \
> > + __print_symbolic(reason, \
> > + { XSK_TRACE_DROP_PKT_TOO_BIG, "len" }, \
> > + { XSK_TRACE_DROP_INVALID_FILLADDR, "addr" }, \
> > + { XSK_TRACE_DROP_INVALID_TXD, "addr" })
> > +
> > +#define print_val2(reason) \
> > + __print_symbolic(reason, \
> > + { XSK_TRACE_DROP_PKT_TOO_BIG, "max" }, \
> > + { XSK_TRACE_DROP_INVALID_FILLADDR, "not_used" }, \
> > + { XSK_TRACE_DROP_INVALID_TXD, "len" })
> > +
> > +#define print_val3(reason) \
> > + __print_symbolic(reason, \
> > + { XSK_TRACE_DROP_PKT_TOO_BIG, "not_used" }, \
> > + { XSK_TRACE_DROP_INVALID_FILLADDR, "not_used" }, \
> > + { XSK_TRACE_DROP_INVALID_TXD, "options" })
> > +
> > +
> > +
>
> nit: 3 empty lines.
>
> > +TRACE_EVENT(xsk_packet_drop,
> > +
> > + TP_PROTO(char *name, u16 queue_id, u32 reason, u64 val1, u64 val2,
> u64 val3),
> > +
> > + TP_ARGS(name, queue_id, reason, val1, val2, val3),
> > +
> > + TP_STRUCT__entry(
> > + __field(char *, name)
> > + __field(u16, queue_id)
> > + __field(u32, reason)
> > + __field(u64, val1)
> > + __field(u32, val2)
> > + __field(u32, val3)
> > + ),
> > +
> > + TP_fast_assign(
> > + __entry->name = name;
> > + __entry->queue_id = queue_id;
> > + __entry->reason = reason;
> > + __entry->val1 = val1;
> > + __entry->val2 = val2;
> > + __entry->val3 = val3;
> > + ),
> > +
> > + TP_printk("netdev: %s qid %u reason: %s: %s %llu %s %u %s %u",
> > + __entry->name, __entry->queue_id, print_reason(__entry-
> >reason),
> > + print_val1(__entry->reason), __entry->val1,
> > + print_val2(__entry->reason), __entry->val2,
> > + print_val3(__entry->reason), __entry->val3
> > + )
> > +);
> > +
> > +#endif /* _TRACE_XSK_H */
> > +
> > +#include <trace/define_trace.h>
> > diff --git a/include/uapi/linux/if_xdp.h b/include/uapi/linux/if_xdp.h
> > index a78a8096f4ce..d7eb031d2465 100644
> > --- a/include/uapi/linux/if_xdp.h
> > +++ b/include/uapi/linux/if_xdp.h
> > @@ -108,4 +108,10 @@ struct xdp_desc {
> >
> > /* UMEM descriptor is __u64 */
> >
> > +enum xdp_trace_reasons {
>
> xdp_trace_reasons above, vs. XSK_TRACE_ below. Is this intentional?
It makes sense to change it to xsk_trace_reasons. I'll respin with this change, and also remove the empty lines you found.
Thanks,
Ciara
>
> > + XSK_TRACE_DROP_PKT_TOO_BIG,
> > + XSK_TRACE_DROP_INVALID_FILLADDR,
> > + XSK_TRACE_DROP_INVALID_TXD,
> > +};
> > +
>
> [...]
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