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Message-ID: <6677d0af33d39_33363c294f8@willemb.c.googlers.com.notmuch>
Date: Sun, 23 Jun 2024 03:37:19 -0400
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: Jakub Kicinski <kuba@...nel.org>,
davem@...emloft.net
Cc: netdev@...r.kernel.org,
edumazet@...gle.com,
pabeni@...hat.com,
willemdebruijn.kernel@...il.com,
ecree.xilinx@...il.com,
Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH net-next 2/4] selftests: drv-net: add helper to wait for
HW stats to sync
Jakub Kicinski wrote:
> Some devices DMA stats to the host periodically. Add a helper
> which can wait for that to happen, based on frequency reported
> by the driver in ethtool.
>
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>
> ---
> .../selftests/drivers/net/lib/py/env.py | 21 ++++++++++++++++++-
> tools/testing/selftests/net/lib/py/utils.py | 4 ++++
> 2 files changed, 24 insertions(+), 1 deletion(-)
>
> diff --git a/tools/testing/selftests/drivers/net/lib/py/env.py b/tools/testing/selftests/drivers/net/lib/py/env.py
> index edcedd7bffab..34f62002b741 100644
> --- a/tools/testing/selftests/drivers/net/lib/py/env.py
> +++ b/tools/testing/selftests/drivers/net/lib/py/env.py
> @@ -1,9 +1,10 @@
> # SPDX-License-Identifier: GPL-2.0
>
> import os
> +import time
> from pathlib import Path
> from lib.py import KsftSkipEx, KsftXfailEx
> -from lib.py import cmd, ip
> +from lib.py import cmd, ethtool, ip
> from lib.py import NetNS, NetdevSimDev
> from .remote import Remote
>
> @@ -82,6 +83,8 @@ from .remote import Remote
>
> self.env = _load_env_file(src_path)
>
> + self._stats_settle_time = None
> +
> # Things we try to destroy
> self.remote = None
> # These are for local testing state
> @@ -222,3 +225,19 @@ from .remote import Remote
> if remote:
> if not self._require_cmd(comm, "remote"):
> raise KsftSkipEx("Test requires (remote) command: " + comm)
> +
> + def wait_hw_stats_settle(self):
> + """
> + Wait for HW stats to become consistent, some devices DMA HW stats
> + periodically so events won't be reflected until next sync.
> + Good drivers will tell us via ethtool what their sync period is.
> + """
> + if self._stats_settle_time is None:
> + data = ethtool("-c " + self.ifname, json=True)[0]
> + if 'stats-block-usecs' in data:
> + self._stats_settle_time = data['stats-block-usecs'] / 1000 / 1000
> + else:
> + # Assume sync not required, we may use a small (50ms?) sleep
> + # regardless if we see flakiness
> + self._stats_settle_time = 0
Intended to set _stats_settle_time to 0.05 here? Else I don't follow
the comment
> + time.sleep(self._stats_settle_time)
> diff --git a/tools/testing/selftests/net/lib/py/utils.py b/tools/testing/selftests/net/lib/py/utils.py
> index 9fa9ec720c89..bf8b5e4d9bac 100644
> --- a/tools/testing/selftests/net/lib/py/utils.py
> +++ b/tools/testing/selftests/net/lib/py/utils.py
> @@ -78,6 +78,10 @@ import time
> return tool('ip', args, json=json, host=host)
>
>
> +def ethtool(args, json=None, ns=None, host=None):
> + return tool('ethtool', args, json=json, ns=ns, host=host)
> +
> +
> def rand_port():
> """
> Get unprivileged port, for now just random, one day we may decide to check if used.
> --
> 2.45.2
>
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