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From: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
To: Jussi Maki <joamaki@gmail.com>
Cc: bpf@vger.kernel.org, netdev@vger.kernel.org,
	daniel@iogearbox.net, j.vosburgh@gmail.com, andy@greyhouse.net,
	vfalico@gmail.com, andrii@kernel.org
Subject: Re: [PATCH bpf-next 1/3] net: bonding: Add XDP support to the bonding driver
Date: Thu, 10 Jun 2021 00:29:58 +0200	[thread overview]
Message-ID: <20210609222958.GA15209@ranger.igk.intel.com> (raw)
In-Reply-To: <20210609135537.1460244-2-joamaki@gmail.com>

On Wed, Jun 09, 2021 at 01:55:35PM +0000, Jussi Maki wrote:
> XDP is implemented in the bonding driver by transparently delegating
> the XDP program loading, removal and xmit operations to the bonding
> slave devices. The overall goal of this work is that XDP programs
> can be attached to a bond device *without* any further changes (or
> awareness) necessary to the program itself, meaning the same XDP
> program can be attached to a native device but also a bonding device.
> 
> Semantics of XDP_TX when attached to a bond are equivalent in such
> setting to the case when a tc/BPF program would be attached to the
> bond, meaning transmitting the packet out of the bond itself using one
> of the bond's configured xmit methods to select a slave device (rather
> than XDP_TX on the slave itself). Handling of XDP_TX to transmit
> using the configured bonding mechanism is therefore implemented by
> rewriting the BPF program return value in bpf_prog_run_xdp. To avoid
> performance impact this check is guarded by a static key, which is
> incremented when a XDP program is loaded onto a bond device. This
> approach was chosen to avoid changes to drivers implementing XDP. If
> the slave device does not match the receive device, then XDP_REDIRECT
> is transparently used to perform the redirection in order to have
> the network driver release the packet from its RX ring.  The bonding
> driver hashing functions have been refactored to allow reuse with
> xdp_buff's to avoid code duplication.
> 
> The motivation for this change is to enable use of bonding (and
> 802.3ad) in hairpinning L4 load-balancers such as [1] implemented with
> XDP and also to transparently support bond devices for projects that
> use XDP given most modern NICs have dual port adapters.  An alternative
> to this approach would be to implement 802.3ad in user-space and
> implement the bonding load-balancing in the XDP program itself, but
> is rather a cumbersome endeavor in terms of slave device management
> (e.g. by watching netlink) and requires separate programs for native
> vs bond cases for the orchestrator. A native in-kernel implementation
> overcomes these issues and provides more flexibility.
> 
> Below are benchmark results done on two machines with 100Gbit
> Intel E810 (ice) NIC and with 32-core 3970X on sending machine, and
> 16-core 3950X on receiving machine. 64 byte packets were sent with
> pktgen-dpdk at full rate. Two issues [2, 3] were identified with the
> ice driver, so the tests were performed with iommu=off and patch [2]
> applied. Additionally the bonding round robin algorithm was modified
> to use per-cpu tx counters as high CPU load (50% vs 10%) and high rate
> of cache misses were caused by the shared rr_tx_counter (see patch
> 2/3). The statistics were collected using "sar -n dev -u 1 10".
> 
>  -----------------------|  CPU  |--| rxpck/s |--| txpck/s |----
>  without patch (1 dev):
>    XDP_DROP:              3.15%      48.6Mpps
>    XDP_TX:                3.12%      18.3Mpps     18.3Mpps
>    XDP_DROP (RSS):        9.47%      116.5Mpps
>    XDP_TX (RSS):          9.67%      25.3Mpps     24.2Mpps
>  -----------------------
>  with patch, bond (1 dev):
>    XDP_DROP:              3.14%      46.7Mpps
>    XDP_TX:                3.15%      13.9Mpps     13.9Mpps
>    XDP_DROP (RSS):        10.33%     117.2Mpps
>    XDP_TX (RSS):          10.64%     25.1Mpps     24.0Mpps
>  -----------------------
>  with patch, bond (2 devs):
>    XDP_DROP:              6.27%      92.7Mpps
>    XDP_TX:                6.26%      17.6Mpps     17.5Mpps
>    XDP_DROP (RSS):       11.38%      117.2Mpps
>    XDP_TX (RSS):         14.30%      28.7Mpps     27.4Mpps
>  --------------------------------------------------------------
> 
> RSS: Receive Side Scaling, e.g. the packets were sent to a range of
> destination IPs.
> 
> [1]: https://cilium.io/blog/2021/05/20/cilium-110#standalonelb
> [2]: https://lore.kernel.org/bpf/20210601113236.42651-1-maciej.fijalkowski@intel.com/T/#t
> [3]: https://lore.kernel.org/bpf/CAHn8xckNXci+X_Eb2WMv4uVYjO2331UWB2JLtXr_58z0Av8+8A@mail.gmail.com/
> 
> Signed-off-by: Jussi Maki <joamaki@gmail.com>
> ---
>  drivers/net/bonding/bond_main.c | 441 ++++++++++++++++++++++++++++----
>  include/linux/filter.h          |  13 +-
>  include/linux/netdevice.h       |   5 +
>  include/net/bonding.h           |   1 +
>  kernel/bpf/devmap.c             |  34 ++-
>  net/core/filter.c               |  37 ++-
>  6 files changed, 467 insertions(+), 64 deletions(-)
> 

Could this patch be broken down onto smaller chunks that would be easier
to review? Also please apply the Reverse Christmas Tree rule.


  reply	other threads:[~2021-06-09 22:42 UTC|newest]

Thread overview: 71+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-09 13:55 [PATCH bpf-next 0/3] XDP bonding support Jussi Maki
2021-06-09 13:55 ` [PATCH bpf-next 1/3] net: bonding: Add XDP support to the bonding driver Jussi Maki
2021-06-09 22:29   ` Maciej Fijalkowski [this message]
2021-06-09 23:29   ` Jay Vosburgh
2021-06-14  8:02     ` Jussi Maki
2021-06-17  3:40   ` kernel test robot
2021-06-17  6:35   ` kernel test robot
2021-06-22  7:24   ` kernel test robot
2021-06-09 13:55 ` [PATCH bpf-next 2/3] net: bonding: Use per-cpu rr_tx_counter Jussi Maki
2021-06-10  0:04   ` Jay Vosburgh
2021-06-14  7:54     ` Jussi Maki
2021-06-09 13:55 ` [PATCH bpf-next 3/3] selftests/bpf: Add tests for XDP bonding Jussi Maki
2021-06-09 22:07   ` Maciej Fijalkowski
2021-06-14  8:08     ` Jussi Maki
2021-06-14  8:48       ` Magnus Karlsson
2021-06-14 12:20         ` Jussi Maki
2021-06-10 17:24 ` [PATCH bpf-next 0/3] XDP bonding support Andrii Nakryiko
2021-06-14 12:25   ` Jussi Maki
2021-06-14 15:37     ` Jay Vosburgh
2021-06-15  5:34     ` Andrii Nakryiko
2021-06-24  9:18 ` [PATCH bpf-next v2 0/4] " joamaki
2021-06-24  9:18   ` [PATCH bpf-next v2 1/4] net: bonding: Refactor bond_xmit_hash for use with xdp_buff joamaki
2021-06-24  9:18   ` [PATCH bpf-next v2 2/4] net: core: Add support for XDP redirection to slave device joamaki
2021-06-24  9:18   ` [PATCH bpf-next v2 3/4] net: bonding: Add XDP support to the bonding driver joamaki
2021-06-24  9:18   ` [PATCH bpf-next v2 4/4] devmap: Exclude XDP broadcast to master device joamaki
2021-07-01 18:12     ` Jay Vosburgh
2021-07-05 11:44       ` Jussi Maki
2021-07-01 18:20   ` [PATCH bpf-next v2 0/4] XDP bonding support Jay Vosburgh
2021-07-05 10:32     ` Jussi Maki
2021-07-07 11:25 ` [PATCH bpf-next v3 0/5] " Jussi Maki
2021-07-07 11:25   ` [PATCH bpf-next v3 1/5] net: bonding: Refactor bond_xmit_hash for use with xdp_buff Jussi Maki
2021-07-07 11:25   ` [PATCH bpf-next v3 2/5] net: core: Add support for XDP redirection to slave device Jussi Maki
2021-07-07 11:25   ` [PATCH bpf-next v3 3/5] net: bonding: Add XDP support to the bonding driver Jussi Maki
2021-07-13  7:14     ` kernel test robot
2021-07-07 11:25   ` [PATCH bpf-next v3 4/5] devmap: Exclude XDP broadcast to master device Jussi Maki
2021-07-07 11:25   ` [PATCH bpf-next v3 5/5] net: core: Allow netdev_lower_get_next_private_rcu in bh context Jussi Maki
2021-07-28 23:43 ` [PATCH bpf-next v4 0/6] XDP bonding support joamaki
2021-07-28 23:43   ` [PATCH bpf-next v4 1/6] net: bonding: Refactor bond_xmit_hash for use with xdp_buff joamaki
2021-07-28 23:43   ` [PATCH bpf-next v4 2/6] net: core: Add support for XDP redirection to slave device joamaki
2021-07-28 23:43   ` [PATCH bpf-next v4 3/6] net: bonding: Add XDP support to the bonding driver joamaki
2021-07-28 23:43   ` [PATCH bpf-next v4 4/6] devmap: Exclude XDP broadcast to master device joamaki
2021-07-28 23:43   ` [PATCH bpf-next v4 5/6] net: core: Allow netdev_lower_get_next_private_rcu in bh context joamaki
2021-07-28 23:43   ` [PATCH bpf-next v4 6/6] selftests/bpf: Add tests for XDP bonding joamaki
2021-08-03  0:19     ` Andrii Nakryiko
2021-08-03  9:40       ` Jussi Maki
2021-07-30  6:18 ` [PATCH bpf-next v5 0/7] XDP bonding support Jussi Maki
2021-07-30  6:18   ` [PATCH bpf-next v5 1/7] net: bonding: Refactor bond_xmit_hash for use with xdp_buff Jussi Maki
2021-07-30  6:18   ` [PATCH bpf-next v5 2/7] net: core: Add support for XDP redirection to slave device Jussi Maki
2021-07-30  6:18   ` [PATCH bpf-next v5 3/7] net: bonding: Add XDP support to the bonding driver Jussi Maki
2021-07-30  6:18   ` [PATCH bpf-next v5 4/7] devmap: Exclude XDP broadcast to master device Jussi Maki
2021-07-30  6:18   ` [PATCH bpf-next v5 5/7] net: core: Allow netdev_lower_get_next_private_rcu in bh context Jussi Maki
2021-07-30  6:18   ` [PATCH bpf-next v5 6/7] selftests/bpf: Fix xdp_tx.c prog section name Jussi Maki
2021-08-04 23:35     ` Andrii Nakryiko
2021-07-30  6:18   ` [PATCH bpf-next v5 7/7] selftests/bpf: Add tests for XDP bonding Jussi Maki
2021-08-04 23:33     ` Andrii Nakryiko
2021-07-31  5:57 ` [PATCH bpf-next v6 0/7]: XDP bonding support Jussi Maki
2021-07-31  5:57   ` [PATCH bpf-next v6 1/7] net: bonding: Refactor bond_xmit_hash for use with xdp_buff Jussi Maki
2021-08-11  1:52     ` Jonathan Toppins
2021-08-11  8:22       ` Jussi Maki
2021-08-11 14:05         ` Jonathan Toppins
2021-08-16  9:05           ` Jussi Maki
2021-07-31  5:57   ` [PATCH bpf-next v6 2/7] net: core: Add support for XDP redirection to slave device Jussi Maki
2021-07-31  5:57   ` [PATCH bpf-next v6 3/7] net: bonding: Add XDP support to the bonding driver Jussi Maki
2021-07-31  5:57   ` [PATCH bpf-next v6 4/7] devmap: Exclude XDP broadcast to master device Jussi Maki
2021-07-31  5:57   ` [PATCH bpf-next v6 5/7] net: core: Allow netdev_lower_get_next_private_rcu in bh context Jussi Maki
2021-07-31  5:57   ` [PATCH bpf-next v6 6/7] selftests/bpf: Fix xdp_tx.c prog section name Jussi Maki
2021-08-06 22:53     ` Andrii Nakryiko
2021-07-31  5:57   ` [PATCH bpf-next v6 7/7] selftests/bpf: Add tests for XDP bonding Jussi Maki
2021-08-06 22:50     ` Andrii Nakryiko
2021-08-09 14:24       ` Jussi Maki
2021-08-09 21:41         ` Daniel Borkmann

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