netdev - Re: [PATCH bpf-next 0/3] XDP bonding support

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Date:   Thu, 10 Jun 2021 10:24:33 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Jussi Maki <joamaki@...il.com>
Cc:     bpf <bpf@...r.kernel.org>, Networking <netdev@...r.kernel.org>,
        Daniel Borkmann <daniel@...earbox.net>, j.vosburgh@...il.com,
        andy@...yhouse.net, vfalico@...il.com,
        Andrii Nakryiko <andrii@...nel.org>
Subject: Re: [PATCH bpf-next 0/3] XDP bonding support

On Wed, Jun 9, 2021 at 6:55 AM Jussi Maki <joamaki@...il.com> wrote:
>
> This patchset introduces XDP support to the bonding driver.
>
> Patch 1 contains the implementation, including support for
> the recently introduced EXCLUDE_INGRESS. Patch 2 contains a
> performance fix to the roundrobin mode which switches rr_tx_counter
> to be per-cpu. Patch 3 contains the test suite for the implementation
> using a pair of veth devices.
>
> The vmtest.sh is modified to enable the bonding module and install
> modules. The config change should probably be done in the libbpf
> repository. Andrii: How would you like this done properly?

I think vmtest.sh and CI setup doesn't support modules (not easily at
least). Can we just compile that driver in? Then you can submit a PR
against libbpf Github repo to adjust the config. We have also kernel
CI repo where we'll need to make this change.

>
> 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/
>
> ---
>
> Jussi Maki (3):
>   net: bonding: Add XDP support to the bonding driver
>   net: bonding: Use per-cpu rr_tx_counter
>   selftests/bpf: Add tests for XDP bonding
>
>  drivers/net/bonding/bond_main.c               | 459 +++++++++++++++---
>  include/linux/filter.h                        |  13 +-
>  include/linux/netdevice.h                     |   5 +
>  include/net/bonding.h                         |   3 +-
>  kernel/bpf/devmap.c                           |  34 +-
>  net/core/filter.c                             |  37 +-
>  .../selftests/bpf/prog_tests/xdp_bonding.c    | 342 +++++++++++++
>  tools/testing/selftests/bpf/vmtest.sh         |  30 +-
>  8 files changed, 843 insertions(+), 80 deletions(-)
>  create mode 100644 tools/testing/selftests/bpf/prog_tests/xdp_bonding.c
>
> --
> 2.30.2
>