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io_uring/zcrx: selftests: add test case for rss ctx

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RSS contexts are used to shard work across multiple queues for an
application using io_uring zero copy receive. Add a test case checking
that steering flows into an RSS context works.

Until I add multi-thread support to the selftest binary, this test case
only has 1 queue in the RSS context.

Signed-off-by: David Wei <dw@davidwei.uk>
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: Joe Damato <jdamato@fastly.com>
Link: https://patch.msgid.link/20250425022049.3474590-4-dw@davidwei.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
David Wei 2025-04-24 19:20:49 -07:00 committed by Jakub Kicinski
parent 4ce3ade36f
commit 5c3524b031
1 changed files with 41 additions and 0 deletions
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41
tools/testing/selftests/drivers/net/hw/iou-zcrx.py
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@ -21,12 +21,25 @@ def _get_combined_channels(cfg):
return int(values[1])
def _create_rss_ctx(cfg, chans):
output = ethtool(f"-X {cfg.ifname} context new start {chans - 1} equal 1", host=cfg.remote).stdout
values = re.search(r'New RSS context is (\d+)', output).group(1)
ctx_id = int(values)
return (ctx_id, defer(ethtool, f"-X {cfg.ifname} delete context {ctx_id}", host=cfg.remote))
def _set_flow_rule(cfg, chan):
output = ethtool(f"-N {cfg.ifname} flow-type tcp6 dst-port 9999 action {chan}", host=cfg.remote).stdout
values = re.search(r'ID (\d+)', output).group(1)
return int(values)
def _set_flow_rule_rss(cfg, chan):
output = ethtool(f"-N {cfg.ifname} flow-type tcp6 dst-port 9999 action {chan}", host=cfg.remote).stdout
values = re.search(r'ID (\d+)', output).group(1)
return int(values)
def test_zcrx(cfg) -> None:
cfg.require_ipver('6')
@ -79,6 +92,34 @@ def test_zcrx_oneshot(cfg) -> None:
cmd(tx_cmd)
def test_zcrx_rss(cfg) -> None:
cfg.require_ipver('6')
combined_chans = _get_combined_channels(cfg)
if combined_chans < 2:
raise KsftSkipEx('at least 2 combined channels required')
(rx_ring, hds_thresh) = _get_current_settings(cfg)
ethtool(f"-G {cfg.ifname} tcp-data-split on", host=cfg.remote)
defer(ethtool, f"-G {cfg.ifname} tcp-data-split auto", host=cfg.remote)
ethtool(f"-G {cfg.ifname} hds-thresh 0", host=cfg.remote)
defer(ethtool, f"-G {cfg.ifname} hds-thresh {hds_thresh}", host=cfg.remote)
ethtool(f"-G {cfg.ifname} rx 64", host=cfg.remote)
defer(ethtool, f"-G {cfg.ifname} rx {rx_ring}", host=cfg.remote)
ethtool(f"-X {cfg.ifname} equal {combined_chans - 1}", host=cfg.remote)
defer(ethtool, f"-X {cfg.ifname} default", host=cfg.remote)
(ctx_id, delete_ctx) = _create_rss_ctx(cfg, combined_chans)
flow_rule_id = _set_flow_rule_rss(cfg, ctx_id)
defer(ethtool, f"-N {cfg.ifname} delete {flow_rule_id}", host=cfg.remote)
rx_cmd = f"{cfg.bin_remote} -s -p 9999 -i {cfg.ifname} -q {combined_chans - 1}"
tx_cmd = f"{cfg.bin_local} -c -h {cfg.remote_addr_v['6']} -p 9999 -l 12840"
with bkg(rx_cmd, host=cfg.remote, exit_wait=True):
wait_port_listen(9999, proto="tcp", host=cfg.remote)
cmd(tx_cmd)
def main() -> None:
with NetDrvEpEnv(__file__) as cfg:
cfg.bin_local = path.abspath(path.dirname(__file__) + "/../../../drivers/net/hw/iou-zcrx")