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igc: Use provided clock ID for history snapshot

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The PTP core indicates in system_device_crosststamp::clock_id the clock ID
for which the system time stamp should be taken. That allows to utilize
hardware timestamps with e.g. AUX clocks.

Save the provided clock ID and use it in igc_phc_get_syncdevicetime() for
taking the history snapshot.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Tested-by: Arthur Kiyanovski <akiyano@amazon.com>
Reviewed-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Link: https://patch.msgid.link/20260529195557.637381831@kernel.org
This commit is contained in:
Thomas Gleixner
2026-05-29 22:00:44 +02:00
parent 23bc637750
commit af1816babc
2 changed files with 4 additions and 1 deletions
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1
drivers/net/ethernet/intel/igc/igc.h
View File

@@ -326,6 +326,7 @@ struct igc_adapter {
struct timespec64 prev_ptp_time; /* Pre-reset PTP clock */
ktime_t ptp_reset_start; /* Reset time in clock mono */
struct system_time_snapshot snapshot;
clockid_t snapshot_clock_id;
struct mutex ptm_lock; /* Only allow one PTM transaction at a time */
char fw_version[32];

4
drivers/net/ethernet/intel/igc/igc_ptp.c
View File

@@ -1049,7 +1049,7 @@ static int igc_phc_get_syncdevicetime(ktime_t *device,
*/
do {
/* Get a snapshot of system clocks to use as historic value. */
ktime_get_snapshot(&adapter->snapshot);
ktime_get_snapshot_id(adapter->snapshot_clock_id, &adapter->snapshot);
igc_ptm_trigger(hw);
@@ -1103,6 +1103,8 @@ static int igc_ptp_getcrosststamp(struct ptp_clock_info *ptp,
/* This blocks until any in progress PTM transactions complete */
mutex_lock(&adapter->ptm_lock);
adapter->snapshot_clock_id = cts->clock_id;
ret = get_device_system_crosststamp(igc_phc_get_syncdevicetime,
adapter, &adapter->snapshot, cts);
mutex_unlock(&adapter->ptm_lock);