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sfc: tidy up PTP synchronize function efx_ptp_process_times() 

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
This commit is contained in:
Laurence Evans 2013-02-11 13:55:08 +00:00 committed by Ben Hutchings
parent c939a31645
commit 9230451af9
1 changed files with 7 additions and 28 deletions
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35
drivers/net/ethernet/sfc/ptp.c
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@ -432,13 +432,10 @@ static int efx_ptp_process_times(struct efx_nic *efx, u8 *synch_buf,
unsigned number_readings = (response_length /
MC_CMD_PTP_OUT_SYNCHRONIZE_TIMESET_LEN);
unsigned i;
unsigned min;
unsigned min_set = 0;
unsigned total;
unsigned ngood = 0;
unsigned last_good = 0;
struct efx_ptp_data *ptp = efx->ptp_data;
bool min_valid = false;
u32 last_sec;
u32 start_sec;
struct timespec delta;
@ -446,35 +443,17 @@ static int efx_ptp_process_times(struct efx_nic *efx, u8 *synch_buf,
if (number_readings == 0)
return -EAGAIN;
/* Find minimum value in this set of results, discarding clearly
* erroneous results.
/* Read the set of results and increment stats for any results that
* appera to be erroneous.
*/
for (i = 0; i < number_readings; i++) {
efx_ptp_read_timeset(synch_buf, &ptp->timeset[i]);
synch_buf += MC_CMD_PTP_OUT_SYNCHRONIZE_TIMESET_LEN;
if (ptp->timeset[i].window > SYNCHRONISATION_GRANULARITY_NS) {
if (min_valid) {
if (ptp->timeset[i].window < min_set)
min_set = ptp->timeset[i].window;
} else {
min_valid = true;
min_set = ptp->timeset[i].window;
}
}
}
if (min_valid) {
if (ptp->base_sync_valid && (min_set > ptp->base_sync_ns))
min = ptp->base_sync_ns;
else
min = min_set;
} else {
min = SYNCHRONISATION_GRANULARITY_NS;
}
/* Discard excessively long synchronise durations. The MC times
* when it finishes reading the host time so the corrected window
* time should be fairly constant for a given platform.
/* 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.
*/
total = 0;
for (i = 0; i < number_readings; i++)
@ -492,8 +471,8 @@ static int efx_ptp_process_times(struct efx_nic *efx, u8 *synch_buf,
if (ngood == 0) {
netif_warn(efx, drv, efx->net_dev,
"PTP no suitable synchronisations %dns %dns\n",
ptp->base_sync_ns, min_set);
"PTP no suitable synchronisations %dns\n",
ptp->base_sync_ns);
return -EAGAIN;
}