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scsi: lpfc: Cap CMF read bytes to MBPI 

Ensure read bytes data does not go over MBPI for CMF timer intervals that
are purposely shortened.

Link: https://lore.kernel.org/r/20211204002644.116455-8-jsmart2021@gmail.com
Co-developed-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
James Smart 2021-12-03 16:26:42 -08:00 committed by Martin K. Petersen
parent a6269f8370
commit 05116ef9c4
2 changed files with 11 additions and 2 deletions
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2
drivers/scsi/lpfc/lpfc.h
View File

@ -1028,7 +1028,7 @@ struct lpfc_hba {
*/
#define HBA_PCI_ERR 0x80000 /* The PCI slot is offline */
#define HBA_FLOGI_ISSUED 0x100000 /* FLOGI was issued */
#define HBA_CGN_RSVD1 0x200000 /* Reserved CGN flag */
#define HBA_SHORT_CMF 0x200000 /* shorter CMF timer routine */
#define HBA_CGN_DAY_WRAP 0x400000 /* HBA Congestion info day wraps */
#define HBA_DEFER_FLOGI 0x800000 /* Defer FLOGI till read_sparm cmpl */
#define HBA_SETUP 0x1000000 /* Signifies HBA setup is completed */

11
drivers/scsi/lpfc/lpfc_init.c
View File

@ -6004,8 +6004,13 @@ lpfc_cmf_timer(struct hrtimer *timer)
if (ms && ms < LPFC_CMF_INTERVAL) {
cnt = div_u64(total, ms); /* bytes per ms */
cnt *= LPFC_CMF_INTERVAL; /* what total should be */
if (cnt > mbpi)
/* If the timeout is scheduled to be shorter,
* this value may skew the data, so cap it at mbpi.
*/
if ((phba->hba_flag & HBA_SHORT_CMF) && cnt > mbpi)
cnt = mbpi;
extra = cnt - total;
}
lpfc_issue_cmf_sync_wqe(phba, LPFC_CMF_INTERVAL, total + extra);
@ -6088,6 +6093,8 @@ lpfc_cmf_timer(struct hrtimer *timer)
/* Each minute save Fabric and Driver congestion information */
lpfc_cgn_save_evt_cnt(phba);
phba->hba_flag &= ~HBA_SHORT_CMF;
/* Since we need to call lpfc_cgn_save_evt_cnt every minute, on the
* minute, adjust our next timer interval, if needed, to ensure a
* 1 minute granularity when we get the next timer interrupt.
@ -6098,6 +6105,8 @@ lpfc_cmf_timer(struct hrtimer *timer)
jiffies);
if (timer_interval <= 0)
timer_interval = LPFC_CMF_INTERVAL;
else
phba->hba_flag |= HBA_SHORT_CMF;
/* If we adjust timer_interval, max_bytes_per_interval
* needs to be adjusted as well.