napi_threaded.py

  1#!/usr/bin/env python3
  2# SPDX-License-Identifier: GPL-2.0
  3
  4"""
  5Test napi threaded states.
  6"""
  7
  8from lib.py import ksft_run, ksft_exit
  9from lib.py import ksft_eq, ksft_ne, ksft_ge
 10from lib.py import NetDrvEnv, NetdevFamily
 11from lib.py import cmd, defer, ethtool
 12
 13
 14def _assert_napi_threaded_enabled(nl, napi_id) -> None:
 15    napi = nl.napi_get({'id': napi_id})
 16    ksft_eq(napi['threaded'], 'enabled')
 17    ksft_ne(napi.get('pid'), None)
 18
 19
 20def _assert_napi_threaded_disabled(nl, napi_id) -> None:
 21    napi = nl.napi_get({'id': napi_id})
 22    ksft_eq(napi['threaded'], 'disabled')
 23    ksft_eq(napi.get('pid'), None)
 24
 25
 26def _set_threaded_state(cfg, threaded) -> None:
 27    with open(f"/sys/class/net/{cfg.ifname}/threaded", "wb") as fp:
 28        fp.write(str(threaded).encode('utf-8'))
 29
 30
 31def _setup_deferred_cleanup(cfg) -> None:
 32    combined = ethtool(f"-l {cfg.ifname}", json=True)[0].get("combined", 0)
 33    ksft_ge(combined, 2)
 34    defer(ethtool, f"-L {cfg.ifname} combined {combined}")
 35
 36    threaded = cmd(f"cat /sys/class/net/{cfg.ifname}/threaded").stdout
 37    defer(_set_threaded_state, cfg, threaded)
 38
 39    return combined
 40
 41
 42def napi_init(cfg, nl) -> None:
 43    """
 44    Test that threaded state (in the persistent NAPI config) gets updated
 45    even when NAPI with given ID is not allocated at the time.
 46    """
 47
 48    qcnt = _setup_deferred_cleanup(cfg)
 49
 50    _set_threaded_state(cfg, 1)
 51    cmd(f"ethtool -L {cfg.ifname} combined 1")
 52    _set_threaded_state(cfg, 0)
 53    cmd(f"ethtool -L {cfg.ifname} combined {qcnt}")
 54
 55    napis = nl.napi_get({'ifindex': cfg.ifindex}, dump=True)
 56    for napi in napis:
 57        ksft_eq(napi['threaded'], 'disabled')
 58        ksft_eq(napi.get('pid'), None)
 59
 60    cmd(f"ethtool -L {cfg.ifname} combined 1")
 61    _set_threaded_state(cfg, 1)
 62    cmd(f"ethtool -L {cfg.ifname} combined {qcnt}")
 63
 64    napis = nl.napi_get({'ifindex': cfg.ifindex}, dump=True)
 65    for napi in napis:
 66        ksft_eq(napi['threaded'], 'enabled')
 67        ksft_ne(napi.get('pid'), None)
 68
 69
 70def enable_dev_threaded_disable_napi_threaded(cfg, nl) -> None:
 71    """
 72    Test that when napi threaded is enabled at device level and
 73    then disabled at napi level for one napi, the threaded state
 74    of all napis is preserved after a change in number of queues.
 75    """
 76
 77    napis = nl.napi_get({'ifindex': cfg.ifindex}, dump=True)
 78    ksft_ge(len(napis), 2)
 79
 80    napi0_id = napis[0]['id']
 81    napi1_id = napis[1]['id']
 82
 83    qcnt = _setup_deferred_cleanup(cfg)
 84
 85    # set threaded
 86    _set_threaded_state(cfg, 1)
 87
 88    # check napi threaded is set for both napis
 89    _assert_napi_threaded_enabled(nl, napi0_id)
 90    _assert_napi_threaded_enabled(nl, napi1_id)
 91
 92    # disable threaded for napi1
 93    nl.napi_set({'id': napi1_id, 'threaded': 'disabled'})
 94
 95    cmd(f"ethtool -L {cfg.ifname} combined 1")
 96    cmd(f"ethtool -L {cfg.ifname} combined {qcnt}")
 97    _assert_napi_threaded_enabled(nl, napi0_id)
 98    _assert_napi_threaded_disabled(nl, napi1_id)
 99
100
101def change_num_queues(cfg, nl) -> None:
102    """
103    Test that when napi threaded is enabled at device level,
104    the napi threaded state is preserved after a change in
105    number of queues.
106    """
107
108    napis = nl.napi_get({'ifindex': cfg.ifindex}, dump=True)
109    ksft_ge(len(napis), 2)
110
111    napi0_id = napis[0]['id']
112    napi1_id = napis[1]['id']
113
114    qcnt = _setup_deferred_cleanup(cfg)
115
116    # set threaded
117    _set_threaded_state(cfg, 1)
118
119    # check napi threaded is set for both napis
120    _assert_napi_threaded_enabled(nl, napi0_id)
121    _assert_napi_threaded_enabled(nl, napi1_id)
122
123    cmd(f"ethtool -L {cfg.ifname} combined 1")
124    cmd(f"ethtool -L {cfg.ifname} combined {qcnt}")
125
126    # check napi threaded is set for both napis
127    _assert_napi_threaded_enabled(nl, napi0_id)
128    _assert_napi_threaded_enabled(nl, napi1_id)
129
130
131def main() -> None:
132    """ Ksft boiler plate main """
133
134    with NetDrvEnv(__file__, queue_count=2) as cfg:
135        ksft_run([napi_init,
136                  change_num_queues,
137                  enable_dev_threaded_disable_napi_threaded],
138                 args=(cfg, NetdevFamily()))
139    ksft_exit()
140
141
142if __name__ == "__main__":
143    main()