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#!/usr/bin/env python3
# SPDX-License-Identifier: GPL-2.0
"""
Driver-related behavior tests for RSS.
"""
from lib.py import ksft_run, ksft_exit, ksft_ge
from lib.py import ksft_variants, KsftNamedVariant, KsftSkipEx
from lib.py import defer, ethtool
from lib.py import EthtoolFamily, NlError
from lib.py import NetDrvEnv
def _is_power_of_two(n):
return n > 0 and (n & (n - 1)) == 0
def _get_rss(cfg, context=0):
return ethtool(f"-x {cfg.ifname} context {context}", json=True)[0]
def _test_rss_indir_size(cfg, qcnt, context=0):
"""Test that indirection table size is at least 4x queue count."""
ethtool(f"-L {cfg.ifname} combined {qcnt}")
rss = _get_rss(cfg, context=context)
indir = rss['rss-indirection-table']
ksft_ge(len(indir), 4 * qcnt, "Table smaller than 4x")
return len(indir)
def _maybe_create_context(cfg, create_context):
""" Either create a context and return its ID or return 0 for main ctx """
if not create_context:
return 0
try:
ctx = cfg.ethnl.rss_create_act({'header': {'dev-index': cfg.ifindex}})
ctx_id = ctx['context']
defer(cfg.ethnl.rss_delete_act,
{'header': {'dev-index': cfg.ifindex}, 'context': ctx_id})
except NlError:
raise KsftSkipEx("Device does not support additional RSS contexts")
return ctx_id
@ksft_variants([
KsftNamedVariant("main", False),
KsftNamedVariant("ctx", True),
])
def indir_size_4x(cfg, create_context):
"""
Test that the indirection table has at least 4 entries per queue.
Empirically network-heavy workloads like memcache suffer with the 33%
imbalance of a 2x indirection table size.
4x table translates to a 16% imbalance.
"""
channels = cfg.ethnl.channels_get({'header': {'dev-index': cfg.ifindex}})
ch_max = channels.get('combined-max', 0)
qcnt = channels['combined-count']
if ch_max < 3:
raise KsftSkipEx(f"Not enough queues for the test: max={ch_max}")
defer(ethtool, f"-L {cfg.ifname} combined {qcnt}")
ethtool(f"-L {cfg.ifname} combined 3")
ctx_id = _maybe_create_context(cfg, create_context)
indir_sz = _test_rss_indir_size(cfg, 3, context=ctx_id)
# Test with max queue count (max - 1 if max is a power of two)
test_max = ch_max - 1 if _is_power_of_two(ch_max) else ch_max
if test_max > 3 and indir_sz < test_max * 4:
_test_rss_indir_size(cfg, test_max, context=ctx_id)
def main() -> None:
""" Ksft boiler plate main """
with NetDrvEnv(__file__) as cfg:
cfg.ethnl = EthtoolFamily()
ksft_run([indir_size_4x], args=(cfg, ))
ksft_exit()
if __name__ == "__main__":
main()
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