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Message-ID: <6e50c1ac-9182-0d86-24fb-afcc2c63db85@blackwall.org>
Date: Fri, 3 Feb 2023 10:58:12 +0200
From: Nikolay Aleksandrov <razor@...ckwall.org>
To: Petr Machata <petrm@...dia.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Roopa Prabhu <roopa@...dia.com>, netdev@...r.kernel.org
Cc: bridge@...ts.linux-foundation.org,
Ido Schimmel <idosch@...dia.com>,
Steven Rostedt <rostedt@...dmis.org>,
linux-trace-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v3 06/16] net: bridge: Add a tracepoint for MDB
overflows
On 02/02/2023 19:59, Petr Machata wrote:
> The following patch will add two more maximum MDB allowances to the global
> one, mcast_hash_max, that exists today. In all these cases, attempts to add
> MDB entries above the configured maximums through netlink, fail noisily and
> obviously. Such visibility is missing when adding entries through the
> control plane traffic, by IGMP or MLD packets.
>
> To improve visibility in those cases, add a trace point that reports the
> violation, including the relevant netdevice (be it a slave or the bridge
> itself), and the MDB entry parameters:
>
> # perf record -e bridge:br_mdb_full &
> # [...]
> # perf script | cut -d: -f4-
> dev v2 af 2 src ::ffff:0.0.0.0 grp ::ffff:239.1.1.112/00:00:00:00:00:00 vid 0
> dev v2 af 10 src :: grp ff0e::112/00:00:00:00:00:00 vid 0
> dev v2 af 2 src ::ffff:0.0.0.0 grp ::ffff:239.1.1.112/00:00:00:00:00:00 vid 10
> dev v2 af 10 src 2001:db8:1::1 grp ff0e::1/00:00:00:00:00:00 vid 10
> dev v2 af 2 src ::ffff:192.0.2.1 grp ::ffff:239.1.1.1/00:00:00:00:00:00 vid 10
>
> CC: Steven Rostedt <rostedt@...dmis.org>
> CC: linux-trace-kernel@...r.kernel.org
> Signed-off-by: Petr Machata <petrm@...dia.com>
> Reviewed-by: Steven Rostedt (Google) <rostedt@...dmis.org>
> ---
>
> Notes:
> v2:
> - Report IPv4 as an IPv6-mapped address through the IPv6 buffer
> as well, to save ring buffer space.
>
> include/trace/events/bridge.h | 58 +++++++++++++++++++++++++++++++++++
> net/core/net-traces.c | 1 +
> 2 files changed, 59 insertions(+)
>
Acked-by: Nikolay Aleksandrov <razor@...ckwall.org>
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