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10fbe8c082
Include the "name" of the context in the comment for traffic checks. Makes it easier to reason about which context failed when we loop over 32 contexts (it may matter if we failed in first vs last, for example). Reviewed-by: Gal Pressman <gal@nvidia.com> Reviewed-by: Joe Damato <jdamato@fastly.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
554 lines
19 KiB
Python
Executable File
554 lines
19 KiB
Python
Executable File
#!/usr/bin/env python3
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# SPDX-License-Identifier: GPL-2.0
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import datetime
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import random
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from lib.py import ksft_run, ksft_pr, ksft_exit, ksft_eq, ksft_ge, ksft_lt
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from lib.py import NetDrvEpEnv
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from lib.py import EthtoolFamily, NetdevFamily
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from lib.py import KsftSkipEx
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from lib.py import rand_port
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from lib.py import ethtool, ip, defer, GenerateTraffic, CmdExitFailure
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def _rss_key_str(key):
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return ":".join(["{:02x}".format(x) for x in key])
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def _rss_key_rand(length):
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return [random.randint(0, 255) for _ in range(length)]
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def _rss_key_check(cfg, data=None, context=0):
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if data is None:
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data = get_rss(cfg, context=context)
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if 'rss-hash-key' not in data:
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return
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non_zero = [x for x in data['rss-hash-key'] if x != 0]
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ksft_eq(bool(non_zero), True, comment=f"RSS key is all zero {data['rss-hash-key']}")
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def get_rss(cfg, context=0):
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return ethtool(f"-x {cfg.ifname} context {context}", json=True)[0]
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def get_drop_err_sum(cfg):
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stats = ip("-s -s link show dev " + cfg.ifname, json=True)[0]
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cnt = 0
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for key in ['errors', 'dropped', 'over_errors', 'fifo_errors',
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'length_errors', 'crc_errors', 'missed_errors',
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'frame_errors']:
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cnt += stats["stats64"]["rx"][key]
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return cnt, stats["stats64"]["tx"]["carrier_changes"]
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def ethtool_create(cfg, act, opts):
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output = ethtool(f"{act} {cfg.ifname} {opts}").stdout
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# Output will be something like: "New RSS context is 1" or
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# "Added rule with ID 7", we want the integer from the end
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return int(output.split()[-1])
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def require_ntuple(cfg):
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features = ethtool(f"-k {cfg.ifname}", json=True)[0]
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if not features["ntuple-filters"]["active"]:
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# ntuple is more of a capability than a config knob, don't bother
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# trying to enable it (until some driver actually needs it).
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raise KsftSkipEx("Ntuple filters not enabled on the device: " + str(features["ntuple-filters"]))
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# Get Rx packet counts for all queues, as a simple list of integers
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# if @prev is specified the prev counts will be subtracted
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def _get_rx_cnts(cfg, prev=None):
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cfg.wait_hw_stats_settle()
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data = cfg.netdevnl.qstats_get({"ifindex": cfg.ifindex, "scope": ["queue"]}, dump=True)
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data = [x for x in data if x['queue-type'] == "rx"]
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max_q = max([x["queue-id"] for x in data])
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queue_stats = [0] * (max_q + 1)
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for q in data:
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queue_stats[q["queue-id"]] = q["rx-packets"]
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if prev and q["queue-id"] < len(prev):
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queue_stats[q["queue-id"]] -= prev[q["queue-id"]]
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return queue_stats
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def _send_traffic_check(cfg, port, name, params):
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# params is a dict with 3 possible keys:
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# - "target": required, which queues we expect to get iperf traffic
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# - "empty": optional, which queues should see no traffic at all
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# - "noise": optional, which queues we expect to see low traffic;
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# used for queues of the main context, since some background
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# OS activity may use those queues while we're testing
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# the value for each is a list, or some other iterable containing queue ids.
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cnts = _get_rx_cnts(cfg)
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GenerateTraffic(cfg, port=port).wait_pkts_and_stop(20000)
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cnts = _get_rx_cnts(cfg, prev=cnts)
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directed = sum(cnts[i] for i in params['target'])
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ksft_ge(directed, 20000, f"traffic on {name}: " + str(cnts))
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if params.get('noise'):
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ksft_lt(sum(cnts[i] for i in params['noise']), directed / 2,
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f"traffic on other queues ({name})':" + str(cnts))
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if params.get('empty'):
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ksft_eq(sum(cnts[i] for i in params['empty']), 0,
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f"traffic on inactive queues ({name}): " + str(cnts))
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def test_rss_key_indir(cfg):
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"""Test basics like updating the main RSS key and indirection table."""
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qcnt = len(_get_rx_cnts(cfg))
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if qcnt < 3:
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KsftSkipEx("Device has fewer than 3 queues (or doesn't support queue stats)")
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data = get_rss(cfg)
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want_keys = ['rss-hash-key', 'rss-hash-function', 'rss-indirection-table']
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for k in want_keys:
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if k not in data:
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raise KsftFailEx("ethtool results missing key: " + k)
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if not data[k]:
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raise KsftFailEx(f"ethtool results empty for '{k}': {data[k]}")
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_rss_key_check(cfg, data=data)
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key_len = len(data['rss-hash-key'])
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# Set the key
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key = _rss_key_rand(key_len)
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ethtool(f"-X {cfg.ifname} hkey " + _rss_key_str(key))
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data = get_rss(cfg)
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ksft_eq(key, data['rss-hash-key'])
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# Set the indirection table and the key together
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key = _rss_key_rand(key_len)
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ethtool(f"-X {cfg.ifname} equal 3 hkey " + _rss_key_str(key))
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reset_indir = defer(ethtool, f"-X {cfg.ifname} default")
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data = get_rss(cfg)
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_rss_key_check(cfg, data=data)
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ksft_eq(0, min(data['rss-indirection-table']))
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ksft_eq(2, max(data['rss-indirection-table']))
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# Reset indirection table and set the key
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key = _rss_key_rand(key_len)
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ethtool(f"-X {cfg.ifname} default hkey " + _rss_key_str(key))
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data = get_rss(cfg)
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_rss_key_check(cfg, data=data)
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ksft_eq(0, min(data['rss-indirection-table']))
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ksft_eq(qcnt - 1, max(data['rss-indirection-table']))
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# Set the indirection table
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ethtool(f"-X {cfg.ifname} equal 2")
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data = get_rss(cfg)
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ksft_eq(0, min(data['rss-indirection-table']))
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ksft_eq(1, max(data['rss-indirection-table']))
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# Check we only get traffic on the first 2 queues
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cnts = _get_rx_cnts(cfg)
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GenerateTraffic(cfg).wait_pkts_and_stop(20000)
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cnts = _get_rx_cnts(cfg, prev=cnts)
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# 2 queues, 20k packets, must be at least 5k per queue
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ksft_ge(cnts[0], 5000, "traffic on main context (1/2): " + str(cnts))
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ksft_ge(cnts[1], 5000, "traffic on main context (2/2): " + str(cnts))
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# The other queues should be unused
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ksft_eq(sum(cnts[2:]), 0, "traffic on unused queues: " + str(cnts))
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# Restore, and check traffic gets spread again
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reset_indir.exec()
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cnts = _get_rx_cnts(cfg)
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GenerateTraffic(cfg).wait_pkts_and_stop(20000)
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cnts = _get_rx_cnts(cfg, prev=cnts)
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# First two queues get less traffic than all the rest
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ksft_lt(sum(cnts[:2]), sum(cnts[2:]), "traffic distributed: " + str(cnts))
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def test_rss_queue_reconfigure(cfg, main_ctx=True):
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"""Make sure queue changes can't override requested RSS config.
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By default main RSS table should change to include all queues.
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When user sets a specific RSS config the driver should preserve it,
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even when queue count changes. Driver should refuse to deactivate
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queues used in the user-set RSS config.
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"""
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if not main_ctx:
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require_ntuple(cfg)
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# Start with 4 queues, an arbitrary known number.
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try:
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qcnt = len(_get_rx_cnts(cfg))
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ethtool(f"-L {cfg.ifname} combined 4")
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defer(ethtool, f"-L {cfg.ifname} combined {qcnt}")
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except:
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raise KsftSkipEx("Not enough queues for the test or qstat not supported")
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if main_ctx:
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ctx_id = 0
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ctx_ref = ""
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else:
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ctx_id = ethtool_create(cfg, "-X", "context new")
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ctx_ref = f"context {ctx_id}"
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defer(ethtool, f"-X {cfg.ifname} {ctx_ref} delete")
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# Indirection table should be distributing to all queues.
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data = get_rss(cfg, context=ctx_id)
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ksft_eq(0, min(data['rss-indirection-table']))
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ksft_eq(3, max(data['rss-indirection-table']))
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# Increase queues, indirection table should be distributing to all queues.
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# It's unclear whether tables of additional contexts should be reset, too.
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if main_ctx:
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ethtool(f"-L {cfg.ifname} combined 5")
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data = get_rss(cfg)
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ksft_eq(0, min(data['rss-indirection-table']))
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ksft_eq(4, max(data['rss-indirection-table']))
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ethtool(f"-L {cfg.ifname} combined 4")
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# Configure the table explicitly
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port = rand_port()
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ethtool(f"-X {cfg.ifname} {ctx_ref} weight 1 0 0 1")
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if main_ctx:
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other_key = 'empty'
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defer(ethtool, f"-X {cfg.ifname} default")
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else:
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other_key = 'noise'
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flow = f"flow-type tcp{cfg.addr_ipver} dst-port {port} context {ctx_id}"
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ntuple = ethtool_create(cfg, "-N", flow)
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defer(ethtool, f"-N {cfg.ifname} delete {ntuple}")
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_send_traffic_check(cfg, port, ctx_ref, { 'target': (0, 3),
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other_key: (1, 2) })
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# We should be able to increase queues, but table should be left untouched
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ethtool(f"-L {cfg.ifname} combined 5")
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data = get_rss(cfg, context=ctx_id)
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ksft_eq({0, 3}, set(data['rss-indirection-table']))
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_send_traffic_check(cfg, port, ctx_ref, { 'target': (0, 3),
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other_key: (1, 2, 4) })
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# Setting queue count to 3 should fail, queue 3 is used
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try:
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ethtool(f"-L {cfg.ifname} combined 3")
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except CmdExitFailure:
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pass
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else:
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raise Exception(f"Driver didn't prevent us from deactivating a used queue (context {ctx_id})")
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def test_rss_resize(cfg):
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"""Test resizing of the RSS table.
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Some devices dynamically increase and decrease the size of the RSS
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indirection table based on the number of enabled queues.
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When that happens driver must maintain the balance of entries
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(preferably duplicating the smaller table).
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"""
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channels = cfg.ethnl.channels_get({'header': {'dev-index': cfg.ifindex}})
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ch_max = channels['combined-max']
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qcnt = channels['combined-count']
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if ch_max < 2:
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raise KsftSkipEx(f"Not enough queues for the test: {ch_max}")
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ethtool(f"-L {cfg.ifname} combined 2")
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defer(ethtool, f"-L {cfg.ifname} combined {qcnt}")
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ethtool(f"-X {cfg.ifname} weight 1 7")
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defer(ethtool, f"-X {cfg.ifname} default")
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ethtool(f"-L {cfg.ifname} combined {ch_max}")
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data = get_rss(cfg)
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ksft_eq(0, min(data['rss-indirection-table']))
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ksft_eq(1, max(data['rss-indirection-table']))
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ksft_eq(7,
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data['rss-indirection-table'].count(1) /
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data['rss-indirection-table'].count(0),
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f"Table imbalance after resize: {data['rss-indirection-table']}")
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def test_hitless_key_update(cfg):
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"""Test that flows may be rehashed without impacting traffic.
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Some workloads may want to rehash the flows in response to an imbalance.
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Most effective way to do that is changing the RSS key. Check that changing
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the key does not cause link flaps or traffic disruption.
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Disrupting traffic for key update is not a bug, but makes the key
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update unusable for rehashing under load.
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"""
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data = get_rss(cfg)
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key_len = len(data['rss-hash-key'])
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key = _rss_key_rand(key_len)
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tgen = GenerateTraffic(cfg)
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try:
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errors0, carrier0 = get_drop_err_sum(cfg)
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t0 = datetime.datetime.now()
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ethtool(f"-X {cfg.ifname} hkey " + _rss_key_str(key))
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t1 = datetime.datetime.now()
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errors1, carrier1 = get_drop_err_sum(cfg)
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finally:
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tgen.wait_pkts_and_stop(5000)
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ksft_lt((t1 - t0).total_seconds(), 0.2)
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ksft_eq(errors1 - errors1, 0)
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ksft_eq(carrier1 - carrier0, 0)
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def test_rss_context(cfg, ctx_cnt=1, create_with_cfg=None):
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"""
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Test separating traffic into RSS contexts.
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The queues will be allocated 2 for each context:
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ctx0 ctx1 ctx2 ctx3
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[0 1] [2 3] [4 5] [6 7] ...
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"""
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require_ntuple(cfg)
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requested_ctx_cnt = ctx_cnt
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# Try to allocate more queues when necessary
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qcnt = len(_get_rx_cnts(cfg))
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if qcnt < 2 + 2 * ctx_cnt:
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try:
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ksft_pr(f"Increasing queue count {qcnt} -> {2 + 2 * ctx_cnt}")
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ethtool(f"-L {cfg.ifname} combined {2 + 2 * ctx_cnt}")
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defer(ethtool, f"-L {cfg.ifname} combined {qcnt}")
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except:
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raise KsftSkipEx("Not enough queues for the test")
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ports = []
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# Use queues 0 and 1 for normal traffic
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ethtool(f"-X {cfg.ifname} equal 2")
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defer(ethtool, f"-X {cfg.ifname} default")
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for i in range(ctx_cnt):
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want_cfg = f"start {2 + i * 2} equal 2"
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create_cfg = want_cfg if create_with_cfg else ""
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try:
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ctx_id = ethtool_create(cfg, "-X", f"context new {create_cfg}")
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defer(ethtool, f"-X {cfg.ifname} context {ctx_id} delete")
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except CmdExitFailure:
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# try to carry on and skip at the end
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if i == 0:
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raise
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ksft_pr(f"Failed to create context {i + 1}, trying to test what we got")
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ctx_cnt = i
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break
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_rss_key_check(cfg, context=ctx_id)
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if not create_with_cfg:
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ethtool(f"-X {cfg.ifname} context {ctx_id} {want_cfg}")
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_rss_key_check(cfg, context=ctx_id)
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# Sanity check the context we just created
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data = get_rss(cfg, ctx_id)
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ksft_eq(min(data['rss-indirection-table']), 2 + i * 2, "Unexpected context cfg: " + str(data))
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ksft_eq(max(data['rss-indirection-table']), 2 + i * 2 + 1, "Unexpected context cfg: " + str(data))
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ports.append(rand_port())
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flow = f"flow-type tcp{cfg.addr_ipver} dst-port {ports[i]} context {ctx_id}"
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ntuple = ethtool_create(cfg, "-N", flow)
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defer(ethtool, f"-N {cfg.ifname} delete {ntuple}")
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for i in range(ctx_cnt):
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_send_traffic_check(cfg, ports[i], f"context {i}",
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{ 'target': (2+i*2, 3+i*2),
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'noise': (0, 1),
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'empty': list(range(2, 2+i*2)) + list(range(4+i*2, 2+2*ctx_cnt)) })
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if requested_ctx_cnt != ctx_cnt:
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raise KsftSkipEx(f"Tested only {ctx_cnt} contexts, wanted {requested_ctx_cnt}")
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def test_rss_context4(cfg):
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test_rss_context(cfg, 4)
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def test_rss_context32(cfg):
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test_rss_context(cfg, 32)
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def test_rss_context4_create_with_cfg(cfg):
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test_rss_context(cfg, 4, create_with_cfg=True)
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def test_rss_context_queue_reconfigure(cfg):
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test_rss_queue_reconfigure(cfg, main_ctx=False)
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def test_rss_context_out_of_order(cfg, ctx_cnt=4):
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"""
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Test separating traffic into RSS contexts.
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Contexts are removed in semi-random order, and steering re-tested
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to make sure removal doesn't break steering to surviving contexts.
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Test requires 3 contexts to work.
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"""
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require_ntuple(cfg)
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requested_ctx_cnt = ctx_cnt
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# Try to allocate more queues when necessary
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qcnt = len(_get_rx_cnts(cfg))
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if qcnt < 2 + 2 * ctx_cnt:
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try:
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ksft_pr(f"Increasing queue count {qcnt} -> {2 + 2 * ctx_cnt}")
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ethtool(f"-L {cfg.ifname} combined {2 + 2 * ctx_cnt}")
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defer(ethtool, f"-L {cfg.ifname} combined {qcnt}")
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except:
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raise KsftSkipEx("Not enough queues for the test")
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ntuple = []
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ctx = []
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ports = []
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def remove_ctx(idx):
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ntuple[idx].exec()
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ntuple[idx] = None
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ctx[idx].exec()
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ctx[idx] = None
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def check_traffic():
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for i in range(ctx_cnt):
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if ctx[i]:
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expected = {
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'target': (2+i*2, 3+i*2),
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'noise': (0, 1),
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'empty': list(range(2, 2+i*2)) + list(range(4+i*2, 2+2*ctx_cnt))
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}
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else:
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expected = {
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'target': (0, 1),
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'empty': range(2, 2+2*ctx_cnt)
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}
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_send_traffic_check(cfg, ports[i], f"context {i}", expected)
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# Use queues 0 and 1 for normal traffic
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ethtool(f"-X {cfg.ifname} equal 2")
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defer(ethtool, f"-X {cfg.ifname} default")
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for i in range(ctx_cnt):
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ctx_id = ethtool_create(cfg, "-X", f"context new start {2 + i * 2} equal 2")
|
|
ctx.append(defer(ethtool, f"-X {cfg.ifname} context {ctx_id} delete"))
|
|
|
|
ports.append(rand_port())
|
|
flow = f"flow-type tcp{cfg.addr_ipver} dst-port {ports[i]} context {ctx_id}"
|
|
ntuple_id = ethtool_create(cfg, "-N", flow)
|
|
ntuple.append(defer(ethtool, f"-N {cfg.ifname} delete {ntuple_id}"))
|
|
|
|
check_traffic()
|
|
|
|
# Remove middle context
|
|
remove_ctx(ctx_cnt // 2)
|
|
check_traffic()
|
|
|
|
# Remove first context
|
|
remove_ctx(0)
|
|
check_traffic()
|
|
|
|
# Remove last context
|
|
remove_ctx(-1)
|
|
check_traffic()
|
|
|
|
if requested_ctx_cnt != ctx_cnt:
|
|
raise KsftSkipEx(f"Tested only {ctx_cnt} contexts, wanted {requested_ctx_cnt}")
|
|
|
|
|
|
def test_rss_context_overlap(cfg, other_ctx=0):
|
|
"""
|
|
Test contexts overlapping with each other.
|
|
Use 4 queues for the main context, but only queues 2 and 3 for context 1.
|
|
"""
|
|
|
|
require_ntuple(cfg)
|
|
|
|
queue_cnt = len(_get_rx_cnts(cfg))
|
|
if queue_cnt < 4:
|
|
try:
|
|
ksft_pr(f"Increasing queue count {queue_cnt} -> 4")
|
|
ethtool(f"-L {cfg.ifname} combined 4")
|
|
defer(ethtool, f"-L {cfg.ifname} combined {queue_cnt}")
|
|
except:
|
|
raise KsftSkipEx("Not enough queues for the test")
|
|
|
|
if other_ctx == 0:
|
|
ethtool(f"-X {cfg.ifname} equal 4")
|
|
defer(ethtool, f"-X {cfg.ifname} default")
|
|
else:
|
|
other_ctx = ethtool_create(cfg, "-X", "context new")
|
|
ethtool(f"-X {cfg.ifname} context {other_ctx} equal 4")
|
|
defer(ethtool, f"-X {cfg.ifname} context {other_ctx} delete")
|
|
|
|
ctx_id = ethtool_create(cfg, "-X", "context new")
|
|
ethtool(f"-X {cfg.ifname} context {ctx_id} start 2 equal 2")
|
|
defer(ethtool, f"-X {cfg.ifname} context {ctx_id} delete")
|
|
|
|
port = rand_port()
|
|
if other_ctx:
|
|
flow = f"flow-type tcp{cfg.addr_ipver} dst-port {port} context {other_ctx}"
|
|
ntuple_id = ethtool_create(cfg, "-N", flow)
|
|
ntuple = defer(ethtool, f"-N {cfg.ifname} delete {ntuple_id}")
|
|
|
|
# Test the main context
|
|
cnts = _get_rx_cnts(cfg)
|
|
GenerateTraffic(cfg, port=port).wait_pkts_and_stop(20000)
|
|
cnts = _get_rx_cnts(cfg, prev=cnts)
|
|
|
|
ksft_ge(sum(cnts[ :4]), 20000, "traffic on main context: " + str(cnts))
|
|
ksft_ge(sum(cnts[ :2]), 7000, "traffic on main context (1/2): " + str(cnts))
|
|
ksft_ge(sum(cnts[2:4]), 7000, "traffic on main context (2/2): " + str(cnts))
|
|
if other_ctx == 0:
|
|
ksft_eq(sum(cnts[4: ]), 0, "traffic on other queues: " + str(cnts))
|
|
|
|
# Now create a rule for context 1 and make sure traffic goes to a subset
|
|
if other_ctx:
|
|
ntuple.exec()
|
|
flow = f"flow-type tcp{cfg.addr_ipver} dst-port {port} context {ctx_id}"
|
|
ntuple_id = ethtool_create(cfg, "-N", flow)
|
|
defer(ethtool, f"-N {cfg.ifname} delete {ntuple_id}")
|
|
|
|
cnts = _get_rx_cnts(cfg)
|
|
GenerateTraffic(cfg, port=port).wait_pkts_and_stop(20000)
|
|
cnts = _get_rx_cnts(cfg, prev=cnts)
|
|
|
|
directed = sum(cnts[2:4])
|
|
ksft_lt(sum(cnts[ :2]), directed / 2, "traffic on main context: " + str(cnts))
|
|
ksft_ge(directed, 20000, "traffic on extra context: " + str(cnts))
|
|
if other_ctx == 0:
|
|
ksft_eq(sum(cnts[4: ]), 0, "traffic on other queues: " + str(cnts))
|
|
|
|
|
|
def test_rss_context_overlap2(cfg):
|
|
test_rss_context_overlap(cfg, True)
|
|
|
|
|
|
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_hitless_key_update,
|
|
test_rss_context, test_rss_context4, test_rss_context32,
|
|
test_rss_context_queue_reconfigure,
|
|
test_rss_context_overlap, test_rss_context_overlap2,
|
|
test_rss_context_out_of_order, test_rss_context4_create_with_cfg],
|
|
args=(cfg, ))
|
|
ksft_exit()
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main()
|