@@ -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
@@ -203,6 +203,39 @@ from lib.py import ethtool, ip, defer, GenerateTraffic, CmdExitFailure
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.
@@ -434,9 +467,11 @@ from lib.py import ethtool, ip, defer, GenerateTraffic, CmdExitFailure
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,
Some workloads may want to rehash the flows in response to an imbalance. Most effective way to do that is changing the RSS key. Check that changing the key does not cause link flaps or traffic disruption. Disrupting traffic for key update is not a bug, but makes the key update unusable for rehashing under load. Signed-off-by: Jakub Kicinski <kuba@kernel.org> --- .../selftests/drivers/net/hw/rss_ctx.py | 37 ++++++++++++++++++- 1 file changed, 36 insertions(+), 1 deletion(-)