linux-kernel - Re: [PATCH net-next v2 2/3] selftests: nic_basic_tests: Add selftest case for speed and duplex state checks

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Message-ID: <66eac9a9e3e22_29b986294c7@willemb.c.googlers.com.notmuch>
Date: Wed, 18 Sep 2024 08:38:01 -0400
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: Mohan Prasad J <mohan.prasad@...rochip.com>, 
 netdev@...r.kernel.org, 
 davem@...emloft.net, 
 kuba@...nel.org, 
 andrew@...n.ch
Cc: edumazet@...gle.com, 
 pabeni@...hat.com, 
 shuah@...nel.org, 
 mohan.prasad@...rochip.com, 
 linux-kernel@...r.kernel.org, 
 linux-kselftest@...r.kernel.org, 
 horms@...nel.org, 
 brett.creeley@....com, 
 rosenp@...il.com, 
 UNGLinuxDriver@...rochip.com, 
 willemb@...gle.com
Subject: Re: [PATCH net-next v2 2/3] selftests: nic_basic_tests: Add selftest
 case for speed and duplex state checks

Mohan Prasad J wrote:
> Add selftest case for testing the speed and duplex state of
> local NIC driver and the partner based on the supported
> link modes obtained from the ethtool. Speed and duplex states
> are varied and verified using ethtool.
> 
> Signed-off-by: Mohan Prasad J <mohan.prasad@...rochip.com>
> ---
>  .../drivers/net/hw/nic_basic_tests.py         | 46 +++++++++++++++++++
>  1 file changed, 46 insertions(+)
> 
> diff --git a/tools/testing/selftests/drivers/net/hw/nic_basic_tests.py b/tools/testing/selftests/drivers/net/hw/nic_basic_tests.py
> index 27f780032..ff46f2406 100644
> --- a/tools/testing/selftests/drivers/net/hw/nic_basic_tests.py
> +++ b/tools/testing/selftests/drivers/net/hw/nic_basic_tests.py
> @@ -42,6 +42,14 @@ from lib.py import ethtool
>  """Global variables"""
>  common_link_modes = []
>  
> +def check_autonegotiation(ifname: str) -> None:
> +    autoneg = get_ethtool_content(ifname, "Supports auto-negotiation:")
> +    partner_autoneg = get_ethtool_content(ifname, "Link partner advertised auto-negotiation:")
> +
> +    """Check if auto-neg supported by local and partner NIC"""
> +    if autoneg[0] != "Yes" or partner_autoneg[0] != "Yes":
> +        raise KsftSkipEx(f"Interface {ifname} or partner does not support auto-negotiation")
> +
>  def get_ethtool_content(ifname: str, field: str):
>      capture = False
>      content = []
> @@ -112,6 +120,25 @@ def verify_autonegotiation(ifname: str, expected_state: str) -> None:
>  
>      ksft_eq(actual_state, expected_state)
>  
> +def set_speed_and_duplex(ifname: str, speed: str, duplex: str) -> None:
> +    """Set the speed and duplex state for the interface"""
> +    process = ethtool(f"--change {ifname} speed {speed} duplex {duplex} autoneg on")
> +
> +    if process.ret != 0:
> +        raise KsftFailEx(f"Not able to set speed and duplex parameters for {ifname}")
> +    ksft_pr(f"Speed: {speed} Mbps, Duplex: {duplex} set for Interface: {ifname}")
> +
> +def verify_speed_and_duplex(ifname: str, expected_speed: str, expected_duplex: str) -> None:
> +    verify_link_up(ifname)
> +    """Verifying the speed and duplex state for the interface"""
> +    with open(f"/sys/class/net/{ifname}/speed", "r") as fp:
> +        actual_speed = fp.read().strip()
> +    with open(f"/sys/class/net/{ifname}/duplex", "r") as fp:
> +        actual_duplex = fp.read().strip()
> +
> +    ksft_eq(actual_speed, expected_speed)
> +    ksft_eq(actual_duplex, expected_duplex)
> +
>  def test_link_modes(cfg) -> None:
>      global common_link_modes
>      link_modes = get_ethtool_content(cfg.ifname, "Supported link modes:")
> @@ -136,6 +163,25 @@ def test_autonegotiation(cfg) -> None:
>      else:
>          raise KsftSkipEx(f"Auto-Negotiation is not supported for interface {cfg.ifname}")
>  
> +def test_network_speed(cfg) -> None:
> +    check_autonegotiation(cfg.ifname)
> +    if not common_link_modes:
> +        KsftSkipEx("No common link modes exist")
> +    speeds, duplex_modes = get_speed_duplex(common_link_modes)
> +
> +    if speeds and duplex_modes and len(speeds) == len(duplex_modes):
> +        for idx in range(len(speeds)):
> +            speed = speeds[idx]
> +            duplex = duplex_modes[idx]
> +            set_speed_and_duplex(cfg.ifname, speed, duplex)
> +            time.sleep(sleep_time)
> +            verify_speed_and_duplex(cfg.ifname, speed, duplex)
> +    else:
> +        if not speeds or not duplex_modes:
> +            KsftSkipEx(f"No supported speeds or duplex modes found for interface {cfg.ifname}")
> +        else:
> +            KsftSkipEx("Mismatch in the number of speeds and duplex modes")
> +

Do these tests reset configuration to their original state?

More high level: basic test is not very descriptive. Can they have a
more precise name? Perhaps link layer operations or link layer config?