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69d094ef69
Add a new selftest to verify netconsole module loading with command line arguments. This test exercises the init_netconsole() path and validates proper parsing of the netconsole= parameter format. The test: - Loads netconsole module with cmdline configuration instead of dynamic reconfiguration - Validates message transmission through the configured target - Adds helper functions for cmdline string generation and module validation This complements existing netconsole selftests by covering the module initialization code path that processes boot-time parameters. This test is useful to test issues like the one described in [1]. Link: https://lore.kernel.org/netdev/Z36TlACdNMwFD7wv@dev-ushankar.dev.purestorage.com/ [1] Signed-off-by: Breno Leitao <leitao@debian.org> Link: https://patch.msgid.link/20250613-rework-v3-8-0752bf2e6912@debian.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
52 lines
1.6 KiB
Bash
Executable file
52 lines
1.6 KiB
Bash
Executable file
#!/usr/bin/env bash
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# SPDX-License-Identifier: GPL-2.0
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# This is a selftest to test cmdline arguments on netconsole.
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# It exercises loading of netconsole from cmdline instead of the dynamic
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# reconfiguration. This includes parsing the long netconsole= line and all the
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# flow through init_netconsole().
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#
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# Author: Breno Leitao <leitao@debian.org>
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set -euo pipefail
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SCRIPTDIR=$(dirname "$(readlink -e "${BASH_SOURCE[0]}")")
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source "${SCRIPTDIR}"/lib/sh/lib_netcons.sh
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check_netconsole_module
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modprobe netdevsim 2> /dev/null || true
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rmmod netconsole 2> /dev/null || true
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# The content of kmsg will be save to the following file
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OUTPUT_FILE="/tmp/${TARGET}"
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# Check for basic system dependency and exit if not found
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# check_for_dependencies
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# Set current loglevel to KERN_INFO(6), and default to KERN_NOTICE(5)
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echo "6 5" > /proc/sys/kernel/printk
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# Remove the namespace and network interfaces
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trap do_cleanup EXIT
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# Create one namespace and two interfaces
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set_network
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# Create the command line for netconsole, with the configuration from the
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# function above
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CMDLINE="$(create_cmdline_str)"
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# Load the module, with the cmdline set
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modprobe netconsole "${CMDLINE}"
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# Listed for netconsole port inside the namespace and destination interface
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listen_port_and_save_to "${OUTPUT_FILE}" &
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# Wait for socat to start and listen to the port.
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wait_local_port_listen "${NAMESPACE}" "${PORT}" udp
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# Send the message
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echo "${MSG}: ${TARGET}" > /dev/kmsg
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# Wait until socat saves the file to disk
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busywait "${BUSYWAIT_TIMEOUT}" test -s "${OUTPUT_FILE}"
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# Make sure the message was received in the dst part
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# and exit
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validate_msg "${OUTPUT_FILE}"
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exit "${ksft_pass}"
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