Re: [PATCH net-next 6/7] selftests: drv-net: extend so_txtime with hw offload

@@ -38,6 +41,34 @@ def test_so_txtime(cfg, clockid, ipver, args_tx, args_rx, expect_success):
         cmd(cmd_tx)
 
 
+def _dev_setup_pacing_offload(cfg):
+    """Configure pacing-offload-horizon."""
+    ethnl = EthtoolFamily()
+
+    try:
+        rings = ethnl.rings_get({'header': {'dev-index': cfg.ifindex}})
+    except NlError:
+        raise KsftSkipEx('ring-get not supported by device')

+
+    if 'pacing-offload-horizon' not in rings or \
+       'pacing-offload-horizon-max' not in rings:
+        raise KsftSkipEx('pacing offload horizon not supported by device')
+
+    if rings['pacing-offload-horizon-max'] < 50_000:
+        raise KsftSkipEx('pacing offload max horizon too small')
+
+    cur_horizon = rings['pacing-offload-horizon']
+    new_horizon = 50_000
+    ethnl.rings_set({
+        'header': {'dev-index': cfg.ifindex},
+        'pacing-offload-horizon': new_horizon,
+    })
+    defer(ethnl.rings_set, {
+        'header': {'dev-index': cfg.ifindex},
+        'pacing-offload-horizon': cur_horizon
+    })
+
+
 def _qdisc_setup(ifname, qdisc, optargs=""):
     """Replace root qdisc. Restore the original after the test.
 

@@ -56,6 +87,7 @@ def _test_variants_fq():
             ["one_pkt", "a,10", "a,10"],
             ["in_order", "a,10,b,20", "a,10,b,20"],
             ["reverse_order", "a,20,b,10", "b,10,a,20"],
+            ["beyond_hw_horizon", "a,70", "a,70"],
         ]:
             name = f"v{ipver}_{testcase[0]}"
             yield KsftNamedVariant(name, ipver, testcase[1], testcase[2])

@@ -64,15 +96,42 @@ def _test_variants_fq():
 @ksft_variants(_test_variants_fq())
 def test_so_txtime_fq_mono(cfg, ipver, args_tx, args_rx):
     """Run all variants of monotonic (fq) tests."""
-    cfg.require_ipver(ipver)
     _qdisc_setup(cfg.ifname, "fq")
     test_so_txtime(cfg, "mono", ipver, args_tx, args_rx, True)
 
 
+@ksft_variants(_test_variants_fq())
+def test_so_txtime_fq_mono_hw(cfg, ipver, args_tx, args_rx):
+    """Run all variants of monotonic fq tests, with offload horizon."""
+    cfg.require_nsim(nsim_test=False)
+
+    _dev_setup_pacing_offload(cfg)
+    try:
+        _qdisc_setup(cfg.ifname, "fq", "offload_horizon 50ms")
+    except Exception as e:
+        raise KsftSkipEx("netdev does not support offload. skipping") from e
+
+    # Expect all tests to use only hw pacing, except beyond_hw_horizon.
+    hw_only = "-h" if args_tx != "a,70" else ""
+    test_so_txtime(cfg, "mono", ipver, f"{hw_only} {args_tx}", args_rx, True)
+
+
+@ksft_variants(_test_variants_fq())
+def test_so_txtime_pfifofast_mono_hw(cfg, ipver, args_tx, args_rx):
+    """Run all variants of monotonic tests, without fq pacing sw backup."""
+    cfg.require_nsim(nsim_test=False)
+
+    _dev_setup_pacing_offload(cfg)
+    _qdisc_setup(cfg.ifname, "pfifo_fast")
+
+    # Expect all tests to pass, except beyond_hw_horizon without sw fallback.
+    expect_pass = False if args_tx == "a,70" else True