From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2FA93187346; Tue, 13 Jan 2026 00:07:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768262870; cv=none; b=aIUQNkrSFbLlDeUkNhNLAhdvdGx0hE6OUBaVykZdG1DRRcZc3T8cDlIovZHY95CTMPCrXCML40RuJ/9xvAe1g28RhJSqbK5MP6ZY0Oj42K0dBp3wGZPhqGnlsowF+r/dX2a8u4785vPmeoIJ99s1emkVGxjH/YTioo29huJvPtc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768262870; c=relaxed/simple; bh=fgERdrcP2bnCmPApJN6cfYGyqInKroEEJ1OAoQysGVU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=hNYQwIN8rUQTOqhoOmM1ZguTYvHfoWeQAemHxGfa15T5Yopjt+CwssMbqHxUB3HstVMIKL/7RbUyGoC7H0kQ6O/yrR1Nq/I+tfpbz4n64DQeLe1jKGklX4hn7mJP+g1pQJsOrH8bbAgy0GthKf7NGDhFoMkF5Cn54Zamv/bq14k= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=rPB/GCTj; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="rPB/GCTj" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 87F5BC19423; Tue, 13 Jan 2026 00:07:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1768262870; bh=fgERdrcP2bnCmPApJN6cfYGyqInKroEEJ1OAoQysGVU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rPB/GCTjn0wOJtksnGxpXaq4hSuqaNVxCbtSidMQ+CXDDvOi3Gai+fhG0PtdUo0ib Kaa6tb0zjaJaIddJoDe5Nbp7eXrR0ChGNs3EpPPazMm3qiUJKGDsxxSkGar0CtEQuP l2RegiFRPlxz/t20VmAc8N7XGvpFkoSC1+8ykHpEdMTsvvXH264wKvSi7XLUtUf437 ALV0Pjhpjw2yT+b8aJeKz7WJS/HDx/iUB5wggZ9JEaYcty/pqXnN/w1Z5Jv12bn3ym rcR6+nlEqmVsk9Ria+ficWxjoDTS4t7turioAl1FNmHeJd0BrbS72BLlmfpangkK42 UekwamwPkVBmw== From: Jakub Kicinski To: davem@davemloft.net Cc: netdev@vger.kernel.org, edumazet@google.com, pabeni@redhat.com, andrew+netdev@lunn.ch, horms@kernel.org, shuah@kernel.org, linux-kselftest@vger.kernel.org, sdf@fomichev.me, willemb@google.com, petrm@nvidia.com, Jakub Kicinski , willemdebruijn.kernel@gmail.com Subject: [PATCH net-next v3 5/6] selftests: drv-net: gro: run the test against HW GRO and LRO Date: Mon, 12 Jan 2026 16:07:39 -0800 Message-ID: <20260113000740.255360-6-kuba@kernel.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260113000740.255360-1-kuba@kernel.org> References: <20260113000740.255360-1-kuba@kernel.org> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Run the test against HW GRO and LRO. NICs I have pass the base cases. Interestingly all are happy to build GROs larger than 64k. Reviewed-by: Willem de Bruijn Signed-off-by: Jakub Kicinski --- v3: - explicitly skip LRO on netdevsim, it lies about support v2: https://lore.kernel.org/20260110005121.3561437-6-kuba@kernel.org - apply the generic XDP hack selectively (print a msg when it happens) - print ethtool -K (setting) output if any, output means that kernel reported that something didn't go according to plan (features we wanted were not actually enabled) v1: https://lore.kernel.org/20251128005242.2604732-2-kuba@kernel.org CC: willemdebruijn.kernel@gmail.com CC: shuah@kernel.org CC: sdf@fomichev.me CC: linux-kselftest@vger.kernel.org --- tools/testing/selftests/drivers/net/gro.py | 68 +++++++++++++++---- .../selftests/drivers/net/lib/py/env.py | 7 +- 2 files changed, 58 insertions(+), 17 deletions(-) diff --git a/tools/testing/selftests/drivers/net/gro.py b/tools/testing/selftests/drivers/net/gro.py index 3c30749ead39..1ab85590c439 100755 --- a/tools/testing/selftests/drivers/net/gro.py +++ b/tools/testing/selftests/drivers/net/gro.py @@ -87,11 +87,15 @@ from lib.py import ksft_variants if no_change: return - ethtool(" ".join(new), host=host) + eth_cmd = ethtool(" ".join(new), host=host) defer(ethtool, " ".join(old), host=host) + # If ethtool printed something kernel must have modified some features + if eth_cmd.stdout: + ksft_pr(eth_cmd) -def _setup(cfg, test_name): + +def _setup(cfg, mode, test_name): """ Setup hardware loopback mode for GRO testing. """ if not hasattr(cfg, "bin_remote"): @@ -108,16 +112,49 @@ from lib.py import ksft_variants _set_mtu_restore(cfg.dev, 4096, None) _set_mtu_restore(cfg.remote_dev, 4096, cfg.remote) - flush_path = f"/sys/class/net/{cfg.ifname}/gro_flush_timeout" - irq_path = f"/sys/class/net/{cfg.ifname}/napi_defer_hard_irqs" + if mode == "sw": + flush_path = f"/sys/class/net/{cfg.ifname}/gro_flush_timeout" + irq_path = f"/sys/class/net/{cfg.ifname}/napi_defer_hard_irqs" - _write_defer_restore(cfg, flush_path, "200000", defer_undo=True) - _write_defer_restore(cfg, irq_path, "10", defer_undo=True) + _write_defer_restore(cfg, flush_path, "200000", defer_undo=True) + _write_defer_restore(cfg, irq_path, "10", defer_undo=True) - _set_ethtool_feat(cfg.ifname, cfg.feat, - {"generic-receive-offload": True, - "rx-gro-hw": False, - "large-receive-offload": False}) + _set_ethtool_feat(cfg.ifname, cfg.feat, + {"generic-receive-offload": True, + "rx-gro-hw": False, + "large-receive-offload": False}) + elif mode == "hw": + _set_ethtool_feat(cfg.ifname, cfg.feat, + {"generic-receive-offload": False, + "rx-gro-hw": True, + "large-receive-offload": False}) + + # Some NICs treat HW GRO as a GRO sub-feature so disabling GRO + # will also clear HW GRO. Use a hack of installing XDP generic + # to skip SW GRO, even when enabled. + feat = ethtool(f"-k {cfg.ifname}", json=True)[0] + if not feat["rx-gro-hw"]["active"]: + ksft_pr("Driver clears HW GRO and SW GRO is cleared, using generic XDP workaround") + prog = cfg.net_lib_dir / "xdp_dummy.bpf.o" + ip(f"link set dev {cfg.ifname} xdpgeneric obj {prog} sec xdp") + defer(ip, f"link set dev {cfg.ifname} xdpgeneric off") + + # Attaching XDP may change features, fetch the latest state + feat = ethtool(f"-k {cfg.ifname}", json=True)[0] + + _set_ethtool_feat(cfg.ifname, feat, + {"generic-receive-offload": True, + "rx-gro-hw": True, + "large-receive-offload": False}) + elif mode == "lro": + # netdevsim advertises LRO for feature inheritance testing with + # bonding/team tests but it doesn't actually perform the offload + cfg.require_nsim(nsim_test=False) + + _set_ethtool_feat(cfg.ifname, cfg.feat, + {"generic-receive-offload": False, + "rx-gro-hw": False, + "large-receive-offload": True}) try: # Disable TSO for local tests @@ -133,19 +170,20 @@ from lib.py import ksft_variants def _gro_variants(): """Generator that yields all combinations of protocol and test types.""" - for protocol in ["ipv4", "ipv6", "ipip"]: - for test_name in ["data", "ack", "flags", "tcp", "ip", "large"]: - yield protocol, test_name + for mode in ["sw", "hw", "lro"]: + for protocol in ["ipv4", "ipv6", "ipip"]: + for test_name in ["data", "ack", "flags", "tcp", "ip", "large"]: + yield mode, protocol, test_name @ksft_variants(_gro_variants()) -def test(cfg, protocol, test_name): +def test(cfg, mode, protocol, test_name): """Run a single GRO test with retries.""" ipver = "6" if protocol[-1] == "6" else "4" cfg.require_ipver(ipver) - _setup(cfg, test_name) + _setup(cfg, mode, test_name) base_cmd_args = [ f"--{protocol}", diff --git a/tools/testing/selftests/drivers/net/lib/py/env.py b/tools/testing/selftests/drivers/net/lib/py/env.py index 63495376e654..41cc248ac848 100644 --- a/tools/testing/selftests/drivers/net/lib/py/env.py +++ b/tools/testing/selftests/drivers/net/lib/py/env.py @@ -248,9 +248,12 @@ from .remote import Remote if not self.addr_v[ipver] or not self.remote_addr_v[ipver]: raise KsftSkipEx(f"Test requires IPv{ipver} connectivity") - def require_nsim(self): - if self._ns is None: + def require_nsim(self, nsim_test=True): + """Require or exclude netdevsim for this test""" + if nsim_test and self._ns is None: raise KsftXfailEx("Test only works on netdevsim") + if nsim_test is False and self._ns is not None: + raise KsftXfailEx("Test does not work on netdevsim") def _require_cmd(self, comm, key, host=None): cached = self._required_cmd.get(comm, {}) -- 2.52.0