diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/scsi/lpfc/lpfc_init.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c index 3fd730613de3..d3a2281cb48b 100644 --- a/drivers/scsi/lpfc/lpfc_init.c +++ b/drivers/scsi/lpfc/lpfc_init.c @@ -5876,7 +5876,7 @@ lpfc_cmf_timer(struct hrtimer *timer) uint32_t io_cnt; uint32_t head, tail; uint32_t busy, max_read; - uint64_t total, rcv, lat, mbpi; + uint64_t total, rcv, lat, mbpi, extra; int timer_interval = LPFC_CMF_INTERVAL; uint32_t ms; struct lpfc_cgn_stat *cgs; @@ -5943,7 +5943,19 @@ lpfc_cmf_timer(struct hrtimer *timer) phba->hba_flag & HBA_SETUP) { mbpi = phba->cmf_last_sync_bw; phba->cmf_last_sync_bw = 0; - lpfc_issue_cmf_sync_wqe(phba, LPFC_CMF_INTERVAL, total); + extra = 0; + + /* Calculate any extra bytes needed to account for the + * timer accuracy. If we are less than LPFC_CMF_INTERVAL + * add an extra 3% slop factor, equal to LPFC_CMF_INTERVAL + * add an extra 2%. The goal is to equalize total with a + * time > LPFC_CMF_INTERVAL or <= LPFC_CMF_INTERVAL + 1 + */ + if (ms == LPFC_CMF_INTERVAL) + extra = div_u64(total, 50); + else if (ms < LPFC_CMF_INTERVAL) + extra = div_u64(total, 33); + lpfc_issue_cmf_sync_wqe(phba, LPFC_CMF_INTERVAL, total + extra); } else { /* For Monitor mode or link down we want mbpi * to be the full link speed |