[net-next, v4, 06/11] ptp: add kernel API ptp_convert_timestamp()
From: Yangbo Lu <yangbo.lu@nxp.com>
Date: 2021-06-25 09:24:47
Also in:
linux-kselftest, lkml, mptcp
Subsystem:
networking drivers, ptp hardware clock support, ptp virtual clock support, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Richard Cochran, Yangbo Lu, Linus Torvalds
Add kernel API ptp_convert_timestamp() to convert raw hardware timestamp to a specified ptp vclock time. Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com> --- Changes for v2: - Split from v1 patch #1 and #2. - Fixed build warning. Changes for v3: - Converted HW timestamps to PHC bound, instead of previous binding domain value to PHC idea. Changes for v4: - Fixed build issue. --- drivers/ptp/ptp_vclock.c | 34 ++++++++++++++++++++++++++++++++ include/linux/ptp_clock_kernel.h | 13 ++++++++++++ 2 files changed, 47 insertions(+)
diff --git a/drivers/ptp/ptp_vclock.c b/drivers/ptp/ptp_vclock.c
index cefab29a0592..e0f87c57749a 100644
--- a/drivers/ptp/ptp_vclock.c
+++ b/drivers/ptp/ptp_vclock.c@@ -183,3 +183,37 @@ int ptp_get_vclocks_index(int pclock_index, int **vclock_index) return num; } EXPORT_SYMBOL(ptp_get_vclocks_index); + +void ptp_convert_timestamp(struct skb_shared_hwtstamps *hwtstamps, + int vclock_index) +{ + char name[PTP_CLOCK_NAME_LEN] = ""; + struct ptp_vclock *vclock; + struct ptp_clock *ptp; + unsigned long flags; + struct device *dev; + u64 ns; + + snprintf(name, PTP_CLOCK_NAME_LEN, "ptp%d", vclock_index); + dev = class_find_device_by_name(ptp_class, name); + if (!dev) + return; + + ptp = dev_get_drvdata(dev); + if (!ptp->is_virtual_clock) { + put_device(dev); + return; + } + + vclock = info_to_vclock(ptp->info); + + ns = ktime_to_ns(hwtstamps->hwtstamp); + + spin_lock_irqsave(&vclock->lock, flags); + ns = timecounter_cyc2time(&vclock->tc, ns); + spin_unlock_irqrestore(&vclock->lock, flags); + + put_device(dev); + hwtstamps->hwtstamp = ns_to_ktime(ns); +} +EXPORT_SYMBOL(ptp_convert_timestamp);
diff --git a/include/linux/ptp_clock_kernel.h b/include/linux/ptp_clock_kernel.h
index 300a984fec87..71fac9237725 100644
--- a/include/linux/ptp_clock_kernel.h
+++ b/include/linux/ptp_clock_kernel.h@@ -12,6 +12,7 @@ #include <linux/pps_kernel.h> #include <linux/ptp_clock.h> #include <linux/timecounter.h> +#include <linux/skbuff.h> #define PTP_CLOCK_NAME_LEN 32 /**
@@ -318,6 +319,15 @@ void ptp_cancel_worker_sync(struct ptp_clock *ptp); */ int ptp_get_vclocks_index(int pclock_index, int **vclock_index); +/** + * ptp_convert_timestamp() - convert timestamp to a ptp vclock time + * + * @hwtstamps: skb_shared_hwtstamps structure pointer + * @vclock_index: phc index of ptp vclock. + */ +void ptp_convert_timestamp(struct skb_shared_hwtstamps *hwtstamps, + int vclock_index); + #else static inline struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info, struct device *parent)
@@ -339,6 +349,9 @@ static inline void ptp_cancel_worker_sync(struct ptp_clock *ptp) { } static inline int ptp_get_vclocks_index(int pclock_index, int **vclock_index) { return 0; } +static inline void ptp_convert_timestamp(struct skb_shared_hwtstamps *hwtstamps, + int vclock_index) +{ } #endif
--
2.25.1