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scsi: qla2xxx: Add support for ZIO6 interrupt threshold

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Add sysfs support to control zio6 interrupt threshold. Using this sysfs hook
user can set when to generate interrupts. This value will be used to tell
firmware to generate interrupt at a certain interval.  If the number of
exchanges/commands fall below defined setting, then the interrupt will be
generated immediately by the firmware.

By default ZIO6 will coalesce interrupts to a specified interval
regardless of low traffic or high traffic.

[mkp: fixed several typos]

Signed-off-by: Quinn Tran <quinn.tran@cavium.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Quinn Tran
2018-09-04 14:19:14 -07:00
committed by Martin K. Petersen
parent 6b0431d6fa
commit 8b4673ba3a
6 changed files with 77 additions and 27 deletions
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42
drivers/scsi/qla2xxx/qla_os.c
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@@ -2840,6 +2840,8 @@ qla2x00_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
atomic_set(&ha->num_pend_mbx_stage1, 0);
atomic_set(&ha->num_pend_mbx_stage2, 0);
atomic_set(&ha->num_pend_mbx_stage3, 0);
atomic_set(&ha->zio_threshold, DEFAULT_ZIO_THRESHOLD);
ha->last_zio_threshold = DEFAULT_ZIO_THRESHOLD;
/* Assign ISP specific operations. */
if (IS_QLA2100(ha)) {
@@ -6224,17 +6226,28 @@ intr_on_check:
mutex_unlock(&ha->mq_lock);
}
if (test_and_clear_bit(SET_ZIO_THRESHOLD_NEEDED, &base_vha->dpc_flags)) {
if (test_and_clear_bit(SET_NVME_ZIO_THRESHOLD_NEEDED,
&base_vha->dpc_flags)) {
ql_log(ql_log_info, base_vha, 0xffffff,
"nvme: SET ZIO Activity exchange threshold to %d.\n",
ha->nvme_last_rptd_aen);
if (qla27xx_set_zio_threshold(base_vha, ha->nvme_last_rptd_aen)) {
if (qla27xx_set_zio_threshold(base_vha,
ha->nvme_last_rptd_aen)) {
ql_log(ql_log_info, base_vha, 0xffffff,
"nvme: Unable to SET ZIO Activity exchange threshold to %d.\n",
ha->nvme_last_rptd_aen);
"nvme: Unable to SET ZIO Activity exchange threshold to %d.\n",
ha->nvme_last_rptd_aen);
}
}
if (test_and_clear_bit(SET_ZIO_THRESHOLD_NEEDED,
&base_vha->dpc_flags)) {
ql_log(ql_log_info, base_vha, 0xffffff,
"SET ZIO Activity exchange threshold to %d.\n",
ha->last_zio_threshold);
qla27xx_set_zio_threshold(base_vha,
ha->last_zio_threshold);
}
if (!IS_QLAFX00(ha))
qla2x00_do_dpc_all_vps(base_vha);
@@ -6447,13 +6460,24 @@ qla2x00_timer(struct timer_list *t)
* FC-NVME
* see if the active AEN count has changed from what was last reported.
*/
if (!vha->vp_idx &&
atomic_read(&ha->nvme_active_aen_cnt) != ha->nvme_last_rptd_aen &&
ha->zio_mode == QLA_ZIO_MODE_6) {
if (!vha->vp_idx && (atomic_read(&ha->nvme_active_aen_cnt) !=
ha->nvme_last_rptd_aen) && ha->zio_mode == QLA_ZIO_MODE_6) {
ql_log(ql_log_info, vha, 0x3002,
"nvme: Sched: Set ZIO exchange threshold to %d.\n",
ha->nvme_last_rptd_aen);
"nvme: Sched: Set ZIO exchange threshold to %d.\n",
ha->nvme_last_rptd_aen);
ha->nvme_last_rptd_aen = atomic_read(&ha->nvme_active_aen_cnt);
set_bit(SET_NVME_ZIO_THRESHOLD_NEEDED, &vha->dpc_flags);
start_dpc++;
}
if (!vha->vp_idx &&
(atomic_read(&ha->zio_threshold) != ha->last_zio_threshold) &&
(ha->zio_mode == QLA_ZIO_MODE_6) &&
(IS_QLA83XX(ha) || IS_QLA27XX(ha))) {
ql_log(ql_log_info, vha, 0x3002,
"Sched: Set ZIO exchange threshold to %d.\n",
ha->last_zio_threshold);
ha->last_zio_threshold = atomic_read(&ha->zio_threshold);
set_bit(SET_ZIO_THRESHOLD_NEEDED, &vha->dpc_flags);
start_dpc++;
}