diff options
| author | Justin Tee <justin.tee@broadcom.com> | 2022-11-15 17:19:17 -0800 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2022-11-17 18:18:42 +0000 |
| commit | ae696255d655bec673e5a5707f37ff6a098e89c2 (patch) | |
| tree | 972d971bd01511e494851648f0c66e8193b11e3e /drivers/scsi | |
| parent | 2c1a0a7584f5084f3ec79f86c9a54ee4c55307c4 (diff) | |
scsi: lpfc: Correct bandwidth logging during receipt of congestion sync WCQE
The lpfc_cmf_timer adjusts phba->cmf_link_byte_count periodically and can
artifically inflate bandwidth percent.
During bandwidth calculation, correct for this by setting a cap of logging
a maximum of 100%.
Bandwidth calculation is only used for display under LOG_CGN_MGMT so there
is no expectation of impacts on performance.
Signed-off-by: Justin Tee <justin.tee@broadcom.com>
Link: https://lore.kernel.org/r/20221116011921.105995-3-justintee8345@gmail.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi')
| -rw-r--r-- | drivers/scsi/lpfc/lpfc_sli.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c index 35c9404d5e49..182aaae60386 100644 --- a/drivers/scsi/lpfc/lpfc_sli.c +++ b/drivers/scsi/lpfc/lpfc_sli.c @@ -1846,6 +1846,12 @@ lpfc_cmf_sync_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb, phba->cmf_link_byte_count); bwpcent = div64_u64(bw * 100 + slop, phba->cmf_link_byte_count); + /* Because of bytes adjustment due to shorter timer in + * lpfc_cmf_timer() the cmf_link_byte_count can be shorter and + * may seem like BW is above 100%. + */ + if (bwpcent > 100) + bwpcent = 100; if (phba->cmf_max_bytes_per_interval < bw && bwpcent > 95) |