From nobody Fri Jan 9 01:36:19 2026 Received: from mail-pf1-f182.google.com (mail-pf1-f182.google.com [209.85.210.182]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7AE1C3101B7 for ; Sun, 4 Jan 2026 18:42:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.182 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767552138; cv=none; b=I+KD4mvhqvfCEKBSJR62e/FufX+TZ1AJACxYrpS9ZGeiib92zhP3XcW4anfxSj6xd4ndzddnTYbw5dg13KQgr88ViNVfYkJTHClkdkBcklMELg9to3SL0KNaYK+G2NnCd9fuzEKWDRqN6V27ipZ2A6hNH72NiT0OX0pZeqBd7EI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767552138; c=relaxed/simple; bh=KSC8Nj3DiK31fDmZ4/PzcbAzUlQgw1PwPAvmb/6l8Os=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=ATF0a4aKc0Y7cJqtTg2vARs7FnVGmDL5sMidg/gc/zkItEIhKirzGgoOpQAxgKha03sQm1KMTljDHjiEUspdNoBsNw0eHVlMsRFyVSv4ZWJiwIPHx06MxFqqMJwc3TkN8E6dl9N6pZ1qniyvT7ehl4tEyTWXS4Lm1sdq76VY9o0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=Pl/OU6jS; arc=none smtp.client-ip=209.85.210.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Pl/OU6jS" Received: by mail-pf1-f182.google.com with SMTP id d2e1a72fcca58-7a9c64dfa8aso10031997b3a.3 for ; Sun, 04 Jan 2026 10:42:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1767552134; x=1768156934; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=2RFEABt6Iiak9nuJmj7Wxw5Z8I9sCXd9qm2gCXqcVTA=; b=Pl/OU6jSJ/bs4oHkZTu9BHcp1V02qksP1a+IAAjFwv25UZ/xlTvhV/kPRobqW64z0y h+nVNck7HBsRNHhPPf1Mp8IN+oXlswndWauKRgipWAYRi/BCWvMpTiEv8YpAcnWu0qMr opJDVHwDcBVO0lhMz3HRwF+vIwIoLvaZabZgJxDZ0k7Z8TOOXBb7UfwR8js6ueCddRfw +dHrpoZwFDF2qi0qtT0JPrq5qwPOEKX9BKYb3SeZFBaTnrWwxlZzfy2kmrnPs1IiAvN4 LfsXtRXst7i9FrPRJPdZaLLbrKbFv9GF02KrUJUoCfgjcAIfBgGvCQct5Ro6z67ym44h UpfA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1767552134; x=1768156934; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-gg:x-gm-message-state:from:to :cc:subject:date:message-id:reply-to; bh=2RFEABt6Iiak9nuJmj7Wxw5Z8I9sCXd9qm2gCXqcVTA=; b=rOYbfpjgZOhwBd7MEY0L+5KhqUK4XJU83I/bhOnWzqKHMYeEDifrCnNMTvCsMSoAch 03qJvoG66b60/6ArZPUo3viMRU0q/oIr327K5OVD5wUmI6vEUev3zm2KwET9lkMkMYct Ex++SbPeeXqrJCdYgpAaP8FlKSK3uFP/7N485cZtZQ708n0Ed9fjCDxRRILsi7iF2+yj 2WWYxf/bNYCI9eSd6TAJ+Xo/FGc3JEoEt9qzzlmQ3UeDUDqLenbFumSfD5hhpq2uJRDT KNFd9ywlbi1WRr0Czvb16BgKTu8P5IZkxoplXiJv0uQTnHbEmMWWb3IYHumROTrcyplu ypyg== X-Forwarded-Encrypted: i=1; AJvYcCWph2C0LNpS/15zTHOBnTmCDl1M75X057alxWmgvXbK2D04Oi3eYRGEJSlYNqVUqK0eeSgjddlQA2XahaQ=@vger.kernel.org X-Gm-Message-State: AOJu0YyeBGOzCvySGvslSgzppPZdyVrnALxbM75onxRnBxjWgPdnbeCt ELibG7FrSyYgsrRiO03FiucGd/CXlv4tLGGoJEk5Kg1UogvLn9CHR4LB X-Gm-Gg: AY/fxX6zVzcU69mW5IcW/VTk5QrB2vINvmN9jLgQS/eLwAQen1tStf9PIKicf6nGKAg Y6cDROj9tO4Zhi2AhiveOHZ0DRfNRHDUtx1yYdTXFPmvcqZJUc6diu/h8WxvbIrDg6sd96JmXMt HWI6NzSHu86fsCuZad82+/95iptyYu5yWTNzkEJVeZQTBNvpDU8JsRXEz5Hp0Nfk602+VekWg4W YDQZKothBjyx2y9Imla3NUMdVjcttyuEFKU2pZTM9LULakBFUcfDipm6fx1DvbexY1ECpr2AQH3 6YusU02d/xSWvAIrFZamp5MH/OrpZfnT3P3BGh62kFBFcq065vkwBDe5rlQ2Z/XSWrh+tFm2D7T D1e9igGUkC1XisUd03B9sXkPJUgdx33ReE0SRG4u4AADu8BM8xqp5A+dAV9NAlTl1Xc3bBFqYoN 61tjgeby7jjDoFkcb9 X-Google-Smtp-Source: AGHT+IFnwIpqXZbzNWeV+xcKxHrl4l/R98bpocjGoxRMFG3stXib8Diu/GTPyxwiD4FcLrZEpn6o6g== X-Received: by 2002:a05:7022:670b:b0:11a:fec5:d005 with SMTP id a92af1059eb24-121721aab84mr42485113c88.10.1767552134246; Sun, 04 Jan 2026 10:42:14 -0800 (PST) Received: from [192.168.15.94] ([179.181.255.35]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-1217254c734sm170975553c88.13.2026.01.04.10.42.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 04 Jan 2026 10:42:13 -0800 (PST) From: Andre Carvalho Date: Sun, 04 Jan 2026 18:41:16 +0000 Subject: [PATCH net-next v9 6/6] selftests: netconsole: validate target resume Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260104-netcons-retrigger-v9-6-38aa643d2283@gmail.com> References: <20260104-netcons-retrigger-v9-0-38aa643d2283@gmail.com> In-Reply-To: <20260104-netcons-retrigger-v9-0-38aa643d2283@gmail.com> To: Breno Leitao , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Shuah Khan , Simon Horman Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Andre Carvalho X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1767552086; l=6537; i=asantostc@gmail.com; s=20250807; h=from:subject:message-id; bh=KSC8Nj3DiK31fDmZ4/PzcbAzUlQgw1PwPAvmb/6l8Os=; b=PgSfxa9US0mdGHwEc+hU6mfJVmj91v5553z6D5A4D99LsDPMgmzV88AP3TyeZcM60Jy5nRZFu 21PaxEXyvnjDX5xPuPeBGwpUak25DWSp/ZimN9zTFXjz+q26KEZQhdn X-Developer-Key: i=asantostc@gmail.com; a=ed25519; pk=eWre+RwFHCxkiaQrZLsjC67mZ/pZnzSM/f7/+yFXY4Q= Introduce a new netconsole selftest to validate that netconsole is able to resume a deactivated target when the low level interface comes back. The test setups the network using netdevsim, creates a netconsole target and then remove/add netdevsim in order to bring the same interfaces back. Afterwards, the test validates that the target works as expected. Targets are created via cmdline parameters to the module to ensure that we are able to resume targets that were bound by mac and interface name. Reviewed-by: Breno Leitao Signed-off-by: Andre Carvalho --- tools/testing/selftests/drivers/net/Makefile | 1 + .../selftests/drivers/net/lib/sh/lib_netcons.sh | 35 ++++++-- .../selftests/drivers/net/netcons_resume.sh | 97 ++++++++++++++++++= ++++ 3 files changed, 128 insertions(+), 5 deletions(-) diff --git a/tools/testing/selftests/drivers/net/Makefile b/tools/testing/s= elftests/drivers/net/Makefile index f5c71d993750..3eba569b3366 100644 --- a/tools/testing/selftests/drivers/net/Makefile +++ b/tools/testing/selftests/drivers/net/Makefile @@ -19,6 +19,7 @@ TEST_PROGS :=3D \ netcons_cmdline.sh \ netcons_fragmented_msg.sh \ netcons_overflow.sh \ + netcons_resume.sh \ netcons_sysdata.sh \ netcons_torture.sh \ netpoll_basic.py \ diff --git a/tools/testing/selftests/drivers/net/lib/sh/lib_netcons.sh b/to= ols/testing/selftests/drivers/net/lib/sh/lib_netcons.sh index ae8abff4be40..b6093bcf2b06 100644 --- a/tools/testing/selftests/drivers/net/lib/sh/lib_netcons.sh +++ b/tools/testing/selftests/drivers/net/lib/sh/lib_netcons.sh @@ -203,19 +203,21 @@ function do_cleanup() { function cleanup_netcons() { # delete netconsole dynamic reconfiguration # do not fail if the target is already disabled - if [[ ! -d "${NETCONS_PATH}" ]] + local TARGET_PATH=3D${1:-${NETCONS_PATH}} + + if [[ ! -d "${TARGET_PATH}" ]] then # in some cases this is called before netcons path is created return fi - if [[ $(cat "${NETCONS_PATH}"/enabled) !=3D 0 ]] + if [[ $(cat "${TARGET_PATH}"/enabled) !=3D 0 ]] then - echo 0 > "${NETCONS_PATH}"/enabled || true + echo 0 > "${TARGET_PATH}"/enabled || true fi # Remove all the keys that got created during the selftest - find "${NETCONS_PATH}/userdata/" -mindepth 1 -type d -delete + find "${TARGET_PATH}/userdata/" -mindepth 1 -type d -delete # Remove the configfs entry - rmdir "${NETCONS_PATH}" + rmdir "${TARGET_PATH}" } =20 function cleanup() { @@ -377,6 +379,29 @@ function check_netconsole_module() { fi } =20 +function wait_target_state() { + local TARGET=3D${1} + local STATE=3D${2} + local TARGET_PATH=3D"${NETCONS_CONFIGFS}"/"${TARGET}" + local ENABLED=3D0 + + if [ "${STATE}" =3D=3D "enabled" ] + then + ENABLED=3D1 + fi + + if [ ! -d "$TARGET_PATH" ]; then + echo "FAIL: Target does not exist." >&2 + exit "${ksft_fail}" + fi + + local CHECK_CMD=3D"grep \"$ENABLED\" \"$TARGET_PATH/enabled\"" + slowwait 2 sh -c "test -n \"\$($CHECK_CMD)\"" || { + echo "FAIL: ${TARGET} is not ${STATE}." >&2 + exit "${ksft_fail}" + } +} + # A wrapper to translate protocol version to udp version function wait_for_port() { local NAMESPACE=3D${1} diff --git a/tools/testing/selftests/drivers/net/netcons_resume.sh b/tools/= testing/selftests/drivers/net/netcons_resume.sh new file mode 100755 index 000000000000..383ad1149271 --- /dev/null +++ b/tools/testing/selftests/drivers/net/netcons_resume.sh @@ -0,0 +1,97 @@ +#!/usr/bin/env bash +# SPDX-License-Identifier: GPL-2.0 + +# This test validates that netconsole is able to resume a target that was +# deactivated when its interface was removed when the interface is brought +# back up. +# +# The test configures a netconsole target and then removes netdevsim modul= e to +# cause the interface to disappear. Targets are configured via cmdline to = ensure +# targets bound by interface name and mac address can be resumed. +# The test verifies that the target moved to disabled state before adding +# netdevsim and the interface back. +# +# Finally, the test verifies that the target is re-enabled automatically a= nd +# the message is received on the destination interface. +# +# Author: Andre Carvalho + +set -euo pipefail + +SCRIPTDIR=3D$(dirname "$(readlink -e "${BASH_SOURCE[0]}")") + +source "${SCRIPTDIR}"/lib/sh/lib_netcons.sh + +modprobe netdevsim 2> /dev/null || true +rmmod netconsole 2> /dev/null || true + +check_netconsole_module + +function cleanup() { + cleanup_netcons "${NETCONS_CONFIGFS}/cmdline0" + do_cleanup + rmmod netconsole +} + +trap cleanup EXIT + +# Run the test twice, with different cmdline parameters +for BINDMODE in "ifname" "mac" +do + echo "Running with bind mode: ${BINDMODE}" >&2 + # Set current loglevel to KERN_INFO(6), and default to KERN_NOTICE(5) + echo "6 5" > /proc/sys/kernel/printk + + # Create one namespace and two interfaces + set_network + + # Create the command line for netconsole, with the configuration from + # the function above + CMDLINE=3D$(create_cmdline_str "${BINDMODE}") + + # The content of kmsg will be save to the following file + OUTPUT_FILE=3D"/tmp/${TARGET}-${BINDMODE}" + + # Load the module, with the cmdline set + modprobe netconsole "${CMDLINE}" + # Expose cmdline target in configfs + mkdir "${NETCONS_CONFIGFS}/cmdline0" + + # Target should be enabled + wait_target_state "cmdline0" "enabled" + + # Remove low level module + rmmod netdevsim + # Target should be disabled + wait_target_state "cmdline0" "disabled" + + # Add back low level module + modprobe netdevsim + # Recreate namespace and two interfaces + set_network + # Target should be enabled again + wait_target_state "cmdline0" "enabled" + + # Listen for netconsole port inside the namespace and destination + # interface + listen_port_and_save_to "${OUTPUT_FILE}" & + # Wait for socat to start and listen to the port. + wait_local_port_listen "${NAMESPACE}" "${PORT}" udp + # Send the message + echo "${MSG}: ${TARGET}" > /dev/kmsg + # Wait until socat saves the file to disk + busywait "${BUSYWAIT_TIMEOUT}" test -s "${OUTPUT_FILE}" + # Make sure the message was received in the dst part + # and exit + validate_msg "${OUTPUT_FILE}" + + # kill socat in case it is still running + pkill_socat + # Cleanup & unload the module + cleanup + + echo "${BINDMODE} : Test passed" >&2 +done + +trap - EXIT +exit "${EXIT_STATUS}" --=20 2.52.0