netdev - Re: [PATCH net-next v5 1/7] net: add rx_sk to trace_kfree

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Date: Tue, 18 Jun 2024 08:15:46 +0200
From: Jesper Dangaard Brouer <hawk@...nel.org>
To: Yan Zhai <yan@...udflare.com>, netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>,
 David Ahern <dsahern@...nel.org>,
 Abhishek Chauhan <quic_abchauha@...cinc.com>,
 Mina Almasry <almasrymina@...gle.com>, Florian Westphal <fw@...len.de>,
 Alexander Lobakin <aleksander.lobakin@...el.com>,
 David Howells <dhowells@...hat.com>, Jiri Pirko <jiri@...nulli.us>,
 Daniel Borkmann <daniel@...earbox.net>,
 Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
 Lorenzo Bianconi <lorenzo@...nel.org>,
 Pavel Begunkov <asml.silence@...il.com>, linux-kernel@...r.kernel.org,
 kernel-team@...udflare.com, Steven Rostedt <rostedt@...dmis.org>,
 Masami Hiramatsu <mhiramat@...nel.org>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Neil Horman <nhorman@...driver.com>, linux-trace-kernel@...r.kernel.org,
 Dan Carpenter <dan.carpenter@...aro.org>
Subject: Re: [PATCH net-next v5 1/7] net: add rx_sk to trace_kfree_skb

On 17/06/2024 20.09, Yan Zhai wrote:
> skb does not include enough information to find out receiving
> sockets/services and netns/containers on packet drops. In theory
> skb->dev tells about netns, but it can get cleared/reused, e.g. by TCP
> stack for OOO packet lookup. Similarly, skb->sk often identifies a local
> sender, and tells nothing about a receiver.
> 
> Allow passing an extra receiving socket to the tracepoint to improve
> the visibility on receiving drops.
> 
> Signed-off-by: Yan Zhai<yan@...udflare.com>
> ---
> v4->v5: rename rx_skaddr -> rx_sk as Jesper Dangaard Brouer suggested
> v3->v4: adjusted the TP_STRUCT field order to be consistent
> v2->v3: fixed drop_monitor function prototype
> ---
>   include/trace/events/skb.h | 11 +++++++----
>   net/core/dev.c             |  2 +-
>   net/core/drop_monitor.c    |  9 ++++++---
>   net/core/skbuff.c          |  2 +-
>   4 files changed, 15 insertions(+), 9 deletions(-)

Acked-by: Jesper Dangaard Brouer <hawk@...nel.org>