netdev - Re: [PATCH net-next v2 2/2] net: selftest: add test for netdev netlink queue-get API

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Date: Sun, 21 Apr 2024 10:56:38 -0400
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: David Wei <dw@...idwei.uk>, 
 netdev@...r.kernel.org
Cc: Jakub Kicinski <kuba@...nel.org>, 
 "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, 
 Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH net-next v2 2/2] net: selftest: add test for netdev
 netlink queue-get API

David Wei wrote:
> Add a selftest for netdev generic netlink. For now there is only a
> single test that exercises the `queue-get` API.
> 
> The test works with netdevsim by default or with a real device by
> setting NETIF.
> 
> Signed-off-by: David Wei <dw@...idwei.uk>
> ---
>  tools/testing/selftests/drivers/net/Makefile  |  1 +
>  .../selftests/drivers/net/lib/py/env.py       |  6 +-
>  tools/testing/selftests/drivers/net/queues.py | 59 +++++++++++++++++++
>  tools/testing/selftests/net/lib/py/nsim.py    |  4 +-
>  4 files changed, 66 insertions(+), 4 deletions(-)
>  create mode 100755 tools/testing/selftests/drivers/net/queues.py
> 
> diff --git a/tools/testing/selftests/drivers/net/Makefile b/tools/testing/selftests/drivers/net/Makefile
> index 379cdb1960a7..118a73650dbc 100644
> --- a/tools/testing/selftests/drivers/net/Makefile
> +++ b/tools/testing/selftests/drivers/net/Makefile
> @@ -3,5 +3,6 @@
>  TEST_INCLUDES := $(wildcard lib/py/*.py)
>  
>  TEST_PROGS := stats.py
> +TEST_PROGS += queues.py
>  
>  include ../../lib.mk
> diff --git a/tools/testing/selftests/drivers/net/lib/py/env.py b/tools/testing/selftests/drivers/net/lib/py/env.py
> index e1abe9491daf..0ac4e9e6cd84 100644
> --- a/tools/testing/selftests/drivers/net/lib/py/env.py
> +++ b/tools/testing/selftests/drivers/net/lib/py/env.py
> @@ -7,7 +7,7 @@ from lib.py import ip
>  from lib.py import NetdevSimDev
>  
>  class NetDrvEnv:
> -    def __init__(self, src_path):
> +    def __init__(self, src_path, **kwargs):
>          self._ns = None
>  
>          self.env = os.environ.copy()
> @@ -16,11 +16,13 @@ class NetDrvEnv:
>          if 'NETIF' in self.env:
>              self.dev = ip("link show dev " + self.env['NETIF'], json=True)[0]
>          else:
> -            self._ns = NetdevSimDev()
> +            self._ns = NetdevSimDev(**kwargs)
>              self.dev = self._ns.nsims[0].dev
>          self.ifindex = self.dev['ifindex']
>  
>      def __enter__(self):
> +        ip(f"link set dev {self.dev['ifname']} up")
> +
>          return self
>  
>      def __exit__(self, ex_type, ex_value, ex_tb):
> diff --git a/tools/testing/selftests/drivers/net/queues.py b/tools/testing/selftests/drivers/net/queues.py
> new file mode 100755
> index 000000000000..c23cd5a932cb
> --- /dev/null
> +++ b/tools/testing/selftests/drivers/net/queues.py
> @@ -0,0 +1,59 @@
> +#!/usr/bin/env python3
> +# SPDX-License-Identifier: GPL-2.0
> +
> +from lib.py import ksft_run, ksft_eq, KsftSkipEx
> +from lib.py import NetdevFamily
> +from lib.py import NetDrvEnv
> +from lib.py import cmd
> +import glob
> +
> +
> +def sys_get_queues(ifname) -> int:
> +    folders = glob.glob(f'/sys/class/net/{ifname}/queues/rx-*')
> +    return len(folders)
> +
> +
> +def nl_get_queues(cfg, nl):
> +    queues = nl.queue_get({'ifindex': cfg.ifindex}, dump=True)
> +    if queues:
> +        return len([q for q in queues if q['type'] == 'rx'])
> +    return None
> +
> +
> +def get_queues(cfg, nl) -> None:
> +    queues = nl_get_queues(cfg, nl)
> +    if not queues:
> +        raise KsftSkipEx("queue-get not supported by device")
> +
> +    expected = sys_get_queues(cfg.dev['ifname'])
> +    ksft_eq(queues, expected)
> +
> +
> +def addremove_queues(cfg, nl) -> None:
> +    queues = nl_get_queues(cfg, nl)
> +    if not queues:
> +        raise KsftSkipEx("queue-get not supported by device")
> +
> +    expected = sys_get_queues(cfg.dev['ifname'])
> +    ksft_eq(queues, expected)
> +

This is a copy of get_queues() above

> +    # reduce queue count by 1
> +    expected = expected - 1

Verify first that queue count > 1. Which it isn't in the test setup.

> +    cmd(f"ethtool -L {cfg.dev['ifname']} combined {expected}")
> +    queues = nl_get_queues(cfg, nl)
> +    ksft_eq(queues, expected)
> +
> +    # increase queue count by 1
> +    expected = expected + 1
> +    cmd(f"ethtool -L {cfg.dev['ifname']} combined {expected}")
> +    queues = nl_get_queues(cfg, nl)
> +    ksft_eq(queues, expected)
> +
> +
> +def main() -> None:
> +    with NetDrvEnv(__file__, queue_count=3) as cfg:
> +        ksft_run([get_queues, addremove_queues], args=(cfg, NetdevFamily()))
> +
> +