tools/testing/selftests/drivers/net/queues.py

#!/usr/bin/env python3
# SPDX-License-Identifier: GPL-2.0

from lib.py import ksft_run, ksft_exit, ksft_eq, KsftSkipEx
from lib.py import EthtoolFamily, 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')

    curr_queues = sys_get_queues(cfg.dev['ifname'])
    if curr_queues == 1:
        raise KsftSkipEx('cannot decrement queue: already at 1')

    netnl = EthtoolFamily()
    channels = netnl.channels_get({'header': {'dev-index': cfg.ifindex}})
    if channels['combined-count'] == 0:
        rx_type = 'rx'
    else:
        rx_type = 'combined'

    expected = curr_queues - 1
    cmd(f"ethtool -L {cfg.dev['ifname']} {rx_type} {expected}", timeout=10)
    queues = nl_get_queues(cfg, nl)
    ksft_eq(queues, expected)

    expected = curr_queues
    cmd(f"ethtool -L {cfg.dev['ifname']} {rx_type} {expected}", timeout=10)
    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()))
    ksft_exit()


if __name__ == "__main__":
    main()