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selftests: drv-net: rss_ctx: check behavior of indirection table resizing

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Some devices dynamically increase and decrease the size of the RSS
indirection table based on the number of enabled queues.
When that happens driver must maintain the balance of entries
(preferably duplicating the smaller table).

Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20240708213627.226025-5-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2024-07-08 14:36:26 -07:00
parent e2c9703d42
commit 7e3e5b0bc5
1 changed files with 36 additions and 1 deletions
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37
tools/testing/selftests/drivers/net/hw/rss_ctx.py
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@ -5,7 +5,7 @@ import datetime
import random
from lib.py import ksft_run, ksft_pr, ksft_exit, ksft_eq, ksft_ge, ksft_lt
from lib.py import NetDrvEpEnv
from lib.py import NetdevFamily
from lib.py import EthtoolFamily, NetdevFamily
from lib.py import KsftSkipEx
from lib.py import rand_port
from lib.py import ethtool, ip, defer, GenerateTraffic, CmdExitFailure
@ -211,6 +211,39 @@ def test_rss_queue_reconfigure(cfg, main_ctx=True):
raise Exception(f"Driver didn't prevent us from deactivating a used queue (context {ctx_id})")
def test_rss_resize(cfg):
"""Test resizing of the RSS table.
Some devices dynamically increase and decrease the size of the RSS
indirection table based on the number of enabled queues.
When that happens driver must maintain the balance of entries
(preferably duplicating the smaller table).
"""
channels = cfg.ethnl.channels_get({'header': {'dev-index': cfg.ifindex}})
ch_max = channels['combined-max']
qcnt = channels['combined-count']
if ch_max < 2:
raise KsftSkipEx(f"Not enough queues for the test: {ch_max}")
ethtool(f"-L {cfg.ifname} combined 2")
defer(ethtool, f"-L {cfg.ifname} combined {qcnt}")
ethtool(f"-X {cfg.ifname} weight 1 7")
defer(ethtool, f"-X {cfg.ifname} default")
ethtool(f"-L {cfg.ifname} combined {ch_max}")
data = get_rss(cfg)
ksft_eq(0, min(data['rss-indirection-table']))
ksft_eq(1, max(data['rss-indirection-table']))
ksft_eq(7,
data['rss-indirection-table'].count(1) /
data['rss-indirection-table'].count(0),
f"Table imbalance after resize: {data['rss-indirection-table']}")
def test_rss_context(cfg, ctx_cnt=1, create_with_cfg=None):
"""
Test separating traffic into RSS contexts.
@ -442,9 +475,11 @@ def test_rss_context_overlap2(cfg):
def main() -> None:
with NetDrvEpEnv(__file__, nsim_test=False) as cfg:
cfg.ethnl = EthtoolFamily()
cfg.netdevnl = NetdevFamily()
ksft_run([test_rss_key_indir, test_rss_queue_reconfigure,
test_rss_resize,
test_rss_context, test_rss_context4, test_rss_context32,
test_rss_context_queue_reconfigure,
test_rss_context_overlap, test_rss_context_overlap2,