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Commit dfd8d581 authored by Laurence Evans's avatar Laurence Evans Committed by Ben Hutchings
Browse files

sfc: Tidy up PTP synchronization code 



Signed-off-by: default avatarBen Hutchings <bhutchings@solarflare.com>
parent 94cd60d0

drivers/net/ethernet/sfc/ptp.c

+24 −20
Original line number Diff line number Diff line
@@ -435,7 +435,6 @@ efx_ptp_process_times(struct efx_nic *efx, MCDI_DECLARE_STRUCT_PTR(synch_buf), 
		MCDI_VAR_ARRAY_LEN(response_length,

				   PTP_OUT_SYNCHRONIZE_TIMESET);

	unsigned i;

	unsigned total;

	unsigned ngood = 0;

	unsigned last_good = 0;

	struct efx_ptp_data *ptp = efx->ptp_data;
@@ -446,29 +445,34 @@ efx_ptp_process_times(struct efx_nic *efx, MCDI_DECLARE_STRUCT_PTR(synch_buf), 
	if (number_readings == 0)

		return -EAGAIN;



	/* Read the set of results and increment stats for any results that

	 * appera to be erroneous.

	/* Read the set of results and find the last good host-MC

	 * synchronization result. The MC times when it finishes reading the

	 * host time so the corrected window time should be fairly constant

	 * for a given platform.

	 */

	for (i = 0; i < number_readings; i++) {

		s32 window, corrected;



		efx_ptp_read_timeset(

			MCDI_ARRAY_STRUCT_PTR(synch_buf,

					      PTP_OUT_SYNCHRONIZE_TIMESET, i),

			&ptp->timeset[i]);

	}



	/* Find the last good host-MC synchronization result. The MC times

	 * when it finishes reading the host time so the corrected window time

	 * should be fairly constant for a given platform.

		window = ptp->timeset[i].window;

		corrected = window - ptp->timeset[i].waitns;



		/* We expect the uncorrected synchronization window to be at

		 * least as large as the interval between host start and end

		 * times. If it is smaller than this then this is mostly likely

		 * to be a consequence of the host's time being adjusted.

		 * Check that the corrected sync window is in a reasonable

		 * range. If it is out of range it is likely to be because an

		 * interrupt or other delay occurred between reading the system

		 * time and writing it to MC memory.

		 */

	total = 0;

	for (i = 0; i < number_readings; i++)

		if (ptp->timeset[i].window > ptp->timeset[i].waitns) {

			unsigned win;



			win = ptp->timeset[i].window - ptp->timeset[i].waitns;

			if (win >= MIN_SYNCHRONISATION_NS &&

			    win < MAX_SYNCHRONISATION_NS) {

				total += ptp->timeset[i].window;

		if (window >= SYNCHRONISATION_GRANULARITY_NS &&

		    corrected < MAX_SYNCHRONISATION_NS &&

		    corrected >= MIN_SYNCHRONISATION_NS) {

			ngood++;

			last_good = i;

		}