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There are several cases where virtual net devices may benefit from having a PTP clock, and these have to do with testing. I can see at least netdevsim and veth as potential users of a common mock-up PTP hardware clock driver. The proposed idea is to create an object which emulates PTP clock operations on top of the unadjustable CLOCK_MONOTONIC_RAW plus a software-controlled time domain via a timecounter/cyclecounter and then link that PHC to the netdevsim device. The driver is fully functional for its intended purpose, and it successfully passes the PTP selftests. $ cd tools/testing/selftests/ptp/ $ ./phc.sh /dev/ptp2 TEST: settime [ OK ] TEST: adjtime [ OK ] TEST: adjfreq [ OK ] Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Link: https://lore.kernel.org/r/20230807193324.4128292-7-vladimir.oltean@nxp.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
38 lines
670 B
C
38 lines
670 B
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Mock-up PTP Hardware Clock driver for virtual network devices
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*
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* Copyright 2023 NXP
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*/
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#ifndef _PTP_MOCK_H_
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#define _PTP_MOCK_H_
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struct device;
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struct mock_phc;
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#if IS_ENABLED(CONFIG_PTP_1588_CLOCK_MOCK)
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struct mock_phc *mock_phc_create(struct device *dev);
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void mock_phc_destroy(struct mock_phc *phc);
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int mock_phc_index(struct mock_phc *phc);
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#else
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static inline struct mock_phc *mock_phc_create(struct device *dev)
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{
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return NULL;
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}
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static inline void mock_phc_destroy(struct mock_phc *phc)
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{
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}
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static inline int mock_phc_index(struct mock_phc *phc)
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{
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return -1;
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}
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#endif
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#endif /* _PTP_MOCK_H_ */
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