Commit ae696255 authored by Justin Tee's avatar Justin Tee Committed by Martin K. Petersen
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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: default avatarJustin Tee <justin.tee@broadcom.com>
Link: https://lore.kernel.org/r/20221116011921.105995-3-justintee8345@gmail.com


Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent 2c1a0a75

drivers/scsi/lpfc/lpfc_sli.c

+6 −0
Original line number Diff line number Diff line
@@ -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)