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scsi: lpfc: Correct bandwidth logging during receipt of congestion sync WCQE

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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>
This commit is contained in:
Justin Tee 2022-11-15 17:19:17 -08:00 • committed by Martin K. Petersen
parent 2c1a0a7584
commit ae696255d6
1 changed files with 6 additions and 0 deletions
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6
drivers/scsi/lpfc/lpfc_sli.c
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@ -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)