Allow per-hba interrupt rate tuning
Signed-off-by: James Smart <james.smart@xxxxxxxxxx>
---
lpfc_attr.c | 27 ++++++++++++++++++++-------
lpfc_hw4.h | 8 +++++---
lpfc_init.c | 2 +-
lpfc_sli.c | 3 ++-
4 files changed, 28 insertions(+), 12 deletions(-)
diff -upNr a/drivers/scsi/lpfc/lpfc_attr.c b/drivers/scsi/lpfc/lpfc_attr.c
--- a/drivers/scsi/lpfc/lpfc_attr.c 2012-07-22 14:17:41.352293516 -0400
+++ b/drivers/scsi/lpfc/lpfc_attr.c 2012-07-22 14:23:42.607280969 -0400
@@ -3643,14 +3643,21 @@ lpfc_fcp_imax_store(struct device *dev,
struct lpfc_hba *phba = vport->phba;
int val = 0, i;
+ /* fcp_imax is only valid for SLI4 */
+ if (phba->sli_rev != LPFC_SLI_REV4)
+ return -EINVAL;
+
/* Sanity check on user data */
if (!isdigit(buf[0]))
return -EINVAL;
if (sscanf(buf, "%i", &val) != 1)
return -EINVAL;
- /* Value range is [636,651042] */
- if (val < LPFC_MIM_IMAX || val > LPFC_DMULT_CONST)
+ /*
+ * Value range for the HBA is [5000,5000000]
+ * The value for each EQ depends on how many EQs are configured.
+ */
+ if (val < LPFC_MIN_IMAX || val > LPFC_MAX_IMAX)
return -EINVAL;
phba->cfg_fcp_imax = (uint32_t)val;
@@ -3662,13 +3669,14 @@ lpfc_fcp_imax_store(struct device *dev,
/*
# lpfc_fcp_imax: The maximum number of fast-path FCP interrupts per second
+# for the HBA.
#
-# Value range is [636,651042]. Default value is 10000.
+# Value range is [5,000 to 5,000,000]. Default value is 50,000.
*/
-static int lpfc_fcp_imax = LPFC_FP_DEF_IMAX;
+static int lpfc_fcp_imax = LPFC_DEF_IMAX;
module_param(lpfc_fcp_imax, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(lpfc_fcp_imax,
- "Set the maximum number of fast-path FCP interrupts per second");
+ "Set the maximum number of FCP interrupts per second per HBA");
lpfc_param_show(fcp_imax)
/**
@@ -3687,14 +3695,19 @@ lpfc_param_show(fcp_imax)
static int
lpfc_fcp_imax_init(struct lpfc_hba *phba, int val)
{
- if (val >= LPFC_MIM_IMAX && val <= LPFC_DMULT_CONST) {
+ if (phba->sli_rev != LPFC_SLI_REV4) {
+ phba->cfg_fcp_imax = 0;
+ return 0;
+ }
+
+ if (val >= LPFC_MIN_IMAX && val <= LPFC_MAX_IMAX) {
phba->cfg_fcp_imax = val;
return 0;
}
lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
"3016 fcp_imax: %d out of range, using default\n", val);
- phba->cfg_fcp_imax = LPFC_FP_DEF_IMAX;
+ phba->cfg_fcp_imax = LPFC_DEF_IMAX;
return 0;
}
diff -upNr a/drivers/scsi/lpfc/lpfc_hw4.h b/drivers/scsi/lpfc/lpfc_hw4.h
--- a/drivers/scsi/lpfc/lpfc_hw4.h 2012-07-22 14:16:54.037295161 -0400
+++ b/drivers/scsi/lpfc/lpfc_hw4.h 2012-07-22 14:23:42.609280969 -0400
@@ -189,9 +189,11 @@ struct lpfc_sli_intf {
/* Delay Multiplier constant */
#define LPFC_DMULT_CONST 651042
-#define LPFC_MIM_IMAX 636
-#define LPFC_FP_DEF_IMAX 10000
-#define LPFC_SP_DEF_IMAX 10000
+
+/* Configuration of Interrupts / sec for entire HBA port */
+#define LPFC_MIN_IMAX 5000
+#define LPFC_MAX_IMAX 5000000
+#define LPFC_DEF_IMAX 50000
/* PORT_CAPABILITIES constants. */
#define LPFC_MAX_SUPPORTED_PAGES 8
diff -upNr a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
--- a/drivers/scsi/lpfc/lpfc_init.c 2012-07-22 14:17:41.361293517 -0400
+++ b/drivers/scsi/lpfc/lpfc_init.c 2012-07-22 14:23:12.197282023 -0400
@@ -6927,7 +6927,7 @@ lpfc_sli4_queue_setup(struct lpfc_hba *p
goto out_destroy_hba_eq;
}
rc = lpfc_eq_create(phba, phba->sli4_hba.hba_eq[fcp_eqidx],
- phba->cfg_fcp_imax);
+ (phba->cfg_fcp_imax / phba->cfg_fcp_io_channel));
if (rc) {
lpfc_printf_log(phba, KERN_ERR, LOG_INIT,
"0523 Failed setup of fast-path EQ "
diff -upNr a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c
--- a/drivers/scsi/lpfc/lpfc_sli.c 2012-07-22 14:17:12.673294513 -0400
+++ b/drivers/scsi/lpfc/lpfc_sli.c 2012-07-22 14:23:06.017282240 -0400
@@ -12079,7 +12079,8 @@ lpfc_modify_fcp_eq_delay(struct lpfc_hba
eq_delay = &mbox->u.mqe.un.eq_delay;
/* Calculate delay multiper from maximum interrupt per second */
- dmult = LPFC_DMULT_CONST/phba->cfg_fcp_imax - 1;
+ dmult = phba->cfg_fcp_imax / phba->cfg_fcp_io_channel;
+ dmult = LPFC_DMULT_CONST/dmult - 1;
cnt = 0;
for (fcp_eqidx = startq; fcp_eqidx < phba->cfg_fcp_io_channel;
--
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