MPT Fusion adapters can steer completions to individual queues, and
we now have support for shared host-wide tags.
So we can enable multiqueue support for MPT fusion adapters.
Once driver enable shared host-wide tags, cpu hotplug feature is also
supported as it was enabled using below patchsets -
commit bf0beec060 ("blk-mq: drain I/O when all CPUs in a hctx are
offline")
Currently the driver has provision to disable host-wide tags using
"host_tagset_enable" module parameter.
Once we do not have any major performance regression using host-wide
tags, we will drop the hand-crafted interrupt affinity settings.
Performance is also meeting the expectation - (used both none and
mq-deadline scheduler)
24 Drive SSD on Aero with/without this patch can get 3.1M IOPs"
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@xxxxxxxxxxxx>
---
drivers/scsi/mpt3sas/mpt3sas_base.c | 50 ++++++++++++++++++----------
drivers/scsi/mpt3sas/mpt3sas_base.h | 1 +
drivers/scsi/mpt3sas/mpt3sas_scsih.c | 42 ++++++++++++++++++++++-
3 files changed, 75 insertions(+), 18 deletions(-)
diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c b/drivers/scsi/mpt3sas/mpt3sas_base.c
index f5582c8..84663d1 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_base.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_base.c
@@ -3648,25 +3648,16 @@ _base_get_msix_index(struct MPT3SAS_ADAPTER *ioc,
base_mod64(atomic64_add_return(1,
&ioc->total_io_cnt), ioc->reply_queue_count) : 0;
- return ioc->cpu_msix_table[raw_smp_processor_id()];
-}
+ if (scmd && ioc->shost->nr_hw_queues > 1) {
+ u32 tag = blk_mq_unique_tag(scmd->request);
-/**
- * _base_sdev_nr_inflight_request -get number of inflight requests
- * of a request queue.
- * @q: request_queue object
- *
- * returns number of inflight request of a request queue.
- */
-inline unsigned long
-_base_sdev_nr_inflight_request(struct request_queue *q)
-{
- struct blk_mq_hw_ctx *hctx = q->queue_hw_ctx[0];
+ return blk_mq_unique_tag_to_hwq(tag) +
+ ioc->high_iops_queues;
+ }
- return atomic_read(&hctx->nr_active);
+ return ioc->cpu_msix_table[raw_smp_processor_id()];
}
-
/**
* _base_get_high_iops_msix_index - get the msix index of
* high iops queues
@@ -3686,7 +3677,8 @@ _base_get_high_iops_msix_index(struct MPT3SAS_ADAPTER *ioc,
* reply queues in terms of batch count 16 when outstanding
* IOs on the target device is >=8.
*/
- if (_base_sdev_nr_inflight_request(scmd->device->request_queue) >
+
+ if (atomic_read(&scmd->device->device_busy) >
MPT3SAS_DEVICE_HIGH_IOPS_DEPTH)
return base_mod64((
atomic64_add_return(1, &ioc->high_iops_outstanding) /
@@ -3739,8 +3731,23 @@ mpt3sas_base_get_smid_scsiio(struct MPT3SAS_ADAPTER *ioc, u8 cb_idx,
struct scsi_cmnd *scmd)
{
struct scsiio_tracker *request = scsi_cmd_priv(scmd);
- unsigned int tag = scmd->request->tag;
u16 smid;
+ u32 tag, unique_tag;
+
+ unique_tag = blk_mq_unique_tag(scmd->request);
+ tag = blk_mq_unique_tag_to_tag(unique_tag);
+
+ /*
+ * store hw queue number corresponding to the tag,
+ * this hw queue number is used later to determine
+ * the unqiue_tag using below logic. This unique_tag
+ * is used to retrieve the scmd pointer corresponding
+ * to tag using scsi_host_find_tag() API,
+ *
+ * tag = smid - 1;
+ * unique_tag = ioc->io_queue_num[tag] << BLK_MQ_UNIQUE_TAG_BITS | tag;
+ */
+ ioc->io_queue_num[tag] = blk_mq_unique_tag_to_hwq(unique_tag);
smid = tag + 1;
request->cb_idx = cb_idx;
@@ -3831,6 +3838,7 @@ mpt3sas_base_free_smid(struct MPT3SAS_ADAPTER *ioc, u16 smid)
mpt3sas_base_clear_st(ioc, st);
_base_recovery_check(ioc);
+ ioc->io_queue_num[smid - 1] = 0;
return;
}
@@ -5362,6 +5370,9 @@ _base_release_memory_pools(struct MPT3SAS_ADAPTER *ioc)
kfree(ioc->chain_lookup);
ioc->chain_lookup = NULL;
}
+
+ kfree(ioc->io_queue_num);
+ ioc->io_queue_num = NULL;
}
/**
@@ -5772,6 +5783,11 @@ _base_allocate_memory_pools(struct MPT3SAS_ADAPTER *ioc)
ioc_info(ioc, "internal(0x%p): depth(%d), start smid(%d)\n",
ioc->internal,
ioc->internal_depth, ioc->internal_smid));
+
+ ioc->io_queue_num = kcalloc(ioc->scsiio_depth,
+ sizeof(u16), GFP_KERNEL);
+ if (!ioc->io_queue_num)
+ goto out;
/*
* The number of NVMe page sized blocks needed is:
* (((sg_tablesize * 8) - 1) / (page_size - 8)) + 1
diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.h b/drivers/scsi/mpt3sas/mpt3sas_base.h
index 2def7a3..2eb94e4 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_base.h
+++ b/drivers/scsi/mpt3sas/mpt3sas_base.h
@@ -1439,6 +1439,7 @@ struct MPT3SAS_ADAPTER {
spinlock_t scsi_lookup_lock;
int pending_io_count;
wait_queue_head_t reset_wq;
+ u16 *io_queue_num;
/* PCIe SGL */
struct dma_pool *pcie_sgl_dma_pool;
diff --git a/drivers/scsi/mpt3sas/mpt3sas_scsih.c b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
index c8b09a8..6973041 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_scsih.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
@@ -54,6 +54,7 @@
#include <linux/interrupt.h>
#include <linux/aer.h>
#include <linux/raid_class.h>
+#include <linux/blk-mq-pci.h>
#include <asm/unaligned.h>
#include "mpt3sas_base.h"
@@ -168,6 +169,11 @@ MODULE_PARM_DESC(multipath_on_hba,
"\t SAS 2.0 & SAS 3.0 HBA - This will be disabled,\n\t\t"
"\t SAS 3.5 HBA - This will be enabled)");
+int host_tagset_enable = 1;
+module_param(host_tagset_enable, int, 0444);
+MODULE_PARM_DESC(host_tagset_enable,
+ "Shared host tagset enable/disable Default: enable(1)");
+
/* raid transport support */
static struct raid_template *mpt3sas_raid_template;
static struct raid_template *mpt2sas_raid_template;
@@ -1743,10 +1749,12 @@ mpt3sas_scsih_scsi_lookup_get(struct MPT3SAS_ADAPTER *ioc, u16 smid)
struct scsi_cmnd *scmd = NULL;
struct scsiio_tracker *st;
Mpi25SCSIIORequest_t *mpi_request;
+ u16 tag = smid - 1;
if (smid > 0 &&
smid <= ioc->scsiio_depth - INTERNAL_SCSIIO_CMDS_COUNT) {
- u32 unique_tag = smid - 1;
+ u32 unique_tag =
+ ioc->io_queue_num[tag] << BLK_MQ_UNIQUE_TAG_BITS | tag;
mpi_request = mpt3sas_base_get_msg_frame(ioc, smid);
@@ -11599,6 +11607,22 @@ scsih_scan_finished(struct Scsi_Host *shost, unsigned long time)
return 1;
}
+/**
+ * scsih_map_queues - map reply queues with request queues
+ * @shost: SCSI host pointer
+ */
+static int scsih_map_queues(struct Scsi_Host *shost)
+{
+ struct MPT3SAS_ADAPTER *ioc =
+ (struct MPT3SAS_ADAPTER *)shost->hostdata;
+
+ if (ioc->shost->nr_hw_queues == 1)
+ return 0;
+
+ return blk_mq_pci_map_queues(&shost->tag_set.map[HCTX_TYPE_DEFAULT],
+ ioc->pdev, ioc->high_iops_queues);
+}
+
/* shost template for SAS 2.0 HBA devices */
static struct scsi_host_template mpt2sas_driver_template = {
.module = THIS_MODULE,
@@ -11666,6 +11690,7 @@ static struct scsi_host_template mpt3sas_driver_template = {
.sdev_attrs = mpt3sas_dev_attrs,
.track_queue_depth = 1,
.cmd_size = sizeof(struct scsiio_tracker),
+ .map_queues = scsih_map_queues,
};
/* raid transport support for SAS 3.0 HBA devices */
@@ -12028,6 +12053,21 @@ _scsih_probe(struct pci_dev *pdev, const struct pci_device_id *id)
} else
ioc->hide_drives = 0;
+ shost->host_tagset = 0;
+ shost->nr_hw_queues = 1;
+
+ if (ioc->is_gen35_ioc && ioc->reply_queue_count > 1 &&
+ host_tagset_enable && ioc->smp_affinity_enable) {
+
+ shost->host_tagset = 1;
+ shost->nr_hw_queues =
+ ioc->reply_queue_count - ioc->high_iops_queues;
+
+ dev_info(&ioc->pdev->dev,
+ "Max SCSIIO MPT commands: %d shared with nr_hw_queues = %d\n",
+ shost->can_queue, shost->nr_hw_queues);
+ }
+
rv = scsi_add_host(shost, &pdev->dev);
if (rv) {
ioc_err(ioc, "failure at %s:%d/%s()!\n",
--
2.27.0
Attachment:
smime.p7s
Description: S/MIME Cryptographic Signature
