From: Lorenz Bauer <lmb@cloudflare.com>
To: Daniel Borkmann <daniel@iogearbox.net>
Cc: "Alexander Lobakin" <alexandr.lobakin@intel.com>,
"David S. Miller" <davem@davemloft.net>,
"Jakub Kicinski" <kuba@kernel.org>,
"Jesse Brandeburg" <jesse.brandeburg@intel.com>,
"Michal Swiatkowski" <michal.swiatkowski@linux.intel.com>,
"Maciej Fijalkowski" <maciej.fijalkowski@intel.com>,
"Jonathan Corbet" <corbet@lwn.net>,
"Shay Agroskin" <shayagr@amazon.com>,
"Arthur Kiyanovski" <akiyano@amazon.com>,
"David Arinzon" <darinzon@amazon.com>,
"Noam Dagan" <ndagan@amazon.com>,
"Saeed Bishara" <saeedb@amazon.com>,
"Ioana Ciornei" <ioana.ciornei@nxp.com>,
"Claudiu Manoil" <claudiu.manoil@nxp.com>,
"Tony Nguyen" <anthony.l.nguyen@intel.com>,
"Thomas Petazzoni" <thomas.petazzoni@bootlin.com>,
"Marcin Wojtas" <mw@semihalf.com>,
"Russell King" <linux@armlinux.org.uk>,
"Saeed Mahameed" <saeedm@nvidia.com>,
"Leon Romanovsky" <leon@kernel.org>,
"Alexei Starovoitov" <ast@kernel.org>,
"Jesper Dangaard Brouer" <hawk@kernel.org>,
"Toke Høiland-Jørgensen" <toke@redhat.com>,
"John Fastabend" <john.fastabend@gmail.com>,
"Edward Cree" <ecree.xilinx@gmail.com>,
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"Michael S. Tsirkin" <mst@redhat.com>,
"Jason Wang" <jasowang@redhat.com>,
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"Martin KaFai Lau" <kafai@fb.com>,
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"KP Singh" <kpsingh@kernel.org>,
"Lorenzo Bianconi" <lorenzo@kernel.org>,
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"Johannes Berg" <johannes.berg@intel.com>,
"Vladimir Oltean" <vladimir.oltean@nxp.com>,
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Networking <netdev@vger.kernel.org>,
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virtualization@lists.linux-foundation.org
Subject: Re: [PATCH v2 net-next 21/26] ice: add XDP and XSK generic per-channel statistics
Date: Wed, 24 Nov 2021 16:34:08 +0000 [thread overview]
Message-ID: <CACAyw9998vkRPX3vZxf8cC6ivVfTFDJPY11Cz08ZUSTLf_s7=A@mail.gmail.com> (raw)
In-Reply-To: <77407c26-4e32-232c-58e0-2d601d781f84@iogearbox.net>
Daniel asked me to share my opinion, as Cloudflare has an XDP load
balancer as well.
On Wed, 24 Nov 2021 at 00:53, Daniel Borkmann <daniel@iogearbox.net> wrote:
> I'm just taking our XDP L4LB in Cilium as an example: there we already count errors and
> export them via per-cpu map that eventually lead to XDP_DROP cases including the /reason/
> which caused the XDP_DROP (e.g. Prometheus can then scrape these insights from all the
> nodes in the cluster). Given the different action codes are very often application specific,
> there's not much debugging that you can do when /only/ looking at `ip link xdpstats` to
> gather insight on *why* some of these actions were triggered (e.g. fib lookup failure, etc).
Agreed. For our purpose we often want to know whether a specific
program has been invoked. Per-channel or per device stats don't help
us much since we have a chain of programs (not using libxdp though).
My colleague Arthur has written xdpcap [1], which gives per-action,
per-program counters. This way we can correlate an action with a
packet and a program.
> If really of interest, then maybe libxdp could have such per-action counters as opt-in in
> its call chain..
We could also make it part of BPF_ENABLE_STATS, it's kind of coarse
grained though.
> In the case of ice_run_xdp() today, we already bump total_rx_bytes/total_rx_pkts under
> XDP and update ice_update_rx_ring_stats(). I do see the case for XDP_TX and XDP_REDIRECT
> where we run into driver-specific errors that are /outside of the reach/ of the BPF prog.
> For example, we've been running into errors from XDP_TX in ice_xmit_xdp_ring() in the
> past during testing, and were able to pinpoint the location as xdp_ring->tx_stats.tx_busy
> was increasing. These things are useful and would make sense to standardize for XDP context.
I'd like to see more tracepoints like trace_xdp_exception, personally.
We can use things like bpftrace for exploration and ebpf_exporter [2]
to generate alerts much more easily than something wired into
iproute2.
Best
Lorenz
1: https://github.com/cloudflare/xdpcap
2: https://github.com/cloudflare/ebpf_exporter
--
Lorenz Bauer | Systems Engineer
6th Floor, County Hall/The Riverside Building, SE1 7PB, UK
www.cloudflare.com
next prev parent reply other threads:[~2021-11-24 16:34 UTC|newest]
Thread overview: 76+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-23 16:39 [PATCH v2 net-next 00/26] net: introduce and use generic XDP stats Alexander Lobakin
2021-11-23 16:39 ` [PATCH v2 net-next 01/26] rtnetlink: introduce generic XDP statistics Alexander Lobakin
2021-11-30 2:36 ` David Ahern
2021-11-23 16:39 ` [PATCH v2 net-next 02/26] xdp: provide common driver helpers for implementing XDP stats Alexander Lobakin
2021-11-23 16:39 ` [PATCH v2 net-next 03/26] ena: implement generic XDP statistics callbacks Alexander Lobakin
2021-11-29 13:34 ` Shay Agroskin
2021-11-30 19:14 ` Alexander Lobakin
2021-11-23 16:39 ` [PATCH v2 net-next 04/26] dpaa2: implement generic XDP stats callbacks Alexander Lobakin
2021-11-23 16:39 ` [PATCH v2 net-next 05/26] enetc: " Alexander Lobakin
2021-11-23 17:09 ` Vladimir Oltean
2021-11-24 11:37 ` Alexander Lobakin
2021-11-23 16:39 ` [PATCH v2 net-next 06/26] mvneta: reformat mvneta_netdev_ops Alexander Lobakin
2021-11-23 16:39 ` [PATCH v2 net-next 07/26] mvneta: add .ndo_get_xdp_stats() callback Alexander Lobakin
2021-11-24 11:39 ` Russell King (Oracle)
2021-11-25 17:16 ` Alexander Lobakin
2021-11-23 16:39 ` [PATCH v2 net-next 08/26] mvpp2: provide " Alexander Lobakin
2021-11-24 11:33 ` Russell King (Oracle)
2021-11-24 11:36 ` Russell King (Oracle)
2021-11-23 16:39 ` [PATCH v2 net-next 09/26] mlx5: don't mix XDP_DROP and Rx XDP error cases Alexander Lobakin
2021-11-24 18:15 ` kernel test robot
2021-11-25 16:40 ` Alexander Lobakin
2021-11-23 16:39 ` [PATCH v2 net-next 10/26] mlx5: provide generic XDP stats callbacks Alexander Lobakin
2021-11-23 16:39 ` [PATCH v2 net-next 11/26] sf100, sfx: implement " Alexander Lobakin
2021-11-24 9:59 ` Edward Cree
2021-11-23 16:39 ` [PATCH v2 net-next 12/26] veth: don't mix XDP_DROP counter with Rx XDP errors Alexander Lobakin
2021-11-23 16:39 ` [PATCH v2 net-next 13/26] veth: drop 'xdp_' suffix from packets and bytes stats Alexander Lobakin
2021-11-23 16:39 ` [PATCH v2 net-next 14/26] veth: reformat veth_netdev_ops Alexander Lobakin
2021-11-23 16:39 ` [PATCH v2 net-next 15/26] veth: add generic XDP stats callbacks Alexander Lobakin
2021-11-23 16:39 ` [PATCH v2 net-next 16/26] virtio_net: don't mix XDP_DROP counter with Rx XDP errors Alexander Lobakin
2021-11-23 16:39 ` [PATCH v2 net-next 17/26] virtio_net: rename xdp_tx{,_drops} SQ stats to xdp_xmit{,_errors} Alexander Lobakin
2021-11-23 16:39 ` [PATCH v2 net-next 18/26] virtio_net: reformat virtnet_netdev Alexander Lobakin
2021-11-23 16:39 ` [PATCH v2 net-next 19/26] virtio_net: add callbacks for generic XDP stats Alexander Lobakin
2021-11-23 16:39 ` [PATCH v2 net-next 20/26] i40e: add XDP and XSK generic per-channel statistics Alexander Lobakin
2021-11-23 16:39 ` [PATCH v2 net-next 21/26] ice: " Alexander Lobakin
2021-11-24 0:52 ` Daniel Borkmann
2021-11-24 16:34 ` Lorenz Bauer [this message]
2021-11-25 11:56 ` Toke Høiland-Jørgensen
2021-11-25 17:07 ` Alexander Lobakin
2021-11-25 17:44 ` Jakub Kicinski
2021-11-25 20:40 ` Alexander Lobakin
2021-11-26 12:30 ` Toke Høiland-Jørgensen
2021-11-26 18:06 ` Jakub Kicinski
2021-11-26 18:47 ` Toke Høiland-Jørgensen
2021-11-26 19:14 ` Jakub Kicinski
2021-11-28 17:54 ` Ido Schimmel
2021-11-29 14:47 ` Jakub Kicinski
2021-11-29 15:51 ` Petr Machata
2021-11-29 15:54 ` Petr Machata
2021-11-29 16:05 ` Jakub Kicinski
2021-11-29 17:08 ` Petr Machata
2021-11-29 17:17 ` Jakub Kicinski
2021-11-30 11:55 ` Petr Machata
2021-11-30 15:07 ` Jakub Kicinski
2021-11-26 22:27 ` Daniel Borkmann
2021-11-26 23:01 ` Daniel Borkmann
2021-11-29 13:59 ` Jesper Dangaard Brouer
2021-11-29 15:03 ` Jakub Kicinski
2021-11-29 11:51 ` Toke Høiland-Jørgensen
2021-11-23 16:39 ` [PATCH v2 net-next 22/26] igb: add XDP " Alexander Lobakin
2021-11-23 16:39 ` [PATCH v2 net-next 23/26] igc: bail out early on XSK xmit if no descs are available Alexander Lobakin
2021-11-23 16:39 ` [PATCH v2 net-next 24/26] igc: add XDP and XSK generic per-channel statistics Alexander Lobakin
2021-11-23 16:39 ` [PATCH v2 net-next 25/26] ixgbe: " Alexander Lobakin
2021-11-23 16:39 ` [PATCH v2 net-next 26/26] Documentation: reflect generic XDP statistics Alexander Lobakin
2021-11-28 22:23 ` [PATCH v2 net-next 00/26] net: introduce and use generic XDP stats David Ahern
2021-11-30 15:56 ` Alexander Lobakin
2021-11-30 16:12 ` Jakub Kicinski
2021-11-30 16:34 ` Alexander Lobakin
2021-11-30 17:04 ` Jakub Kicinski
2021-11-30 17:38 ` David Ahern
2021-11-30 19:46 ` Jakub Kicinski
2021-12-01 15:21 ` Jamal Hadi Salim
2021-11-30 16:17 ` Toke Høiland-Jørgensen
2021-11-30 17:07 ` Jakub Kicinski
2021-11-30 17:56 ` David Ahern
2021-11-30 19:53 ` Jakub Kicinski
2021-11-30 17:45 ` David Ahern
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