scsi: smartpqi: Speed up RAID 10 sequential reads

Use all data disks for sequential read operations.

Testing discovered inconsistent performance on RAID 10 volumes when
performing 256K sequential reads. The driver was only using a single
tracker to determine which physical drive to send a request to for AIO
requests.

Change the single tracker (next_bypass_group) to an array of trackers based
on the number of data disks in a row of the RAID map.

Link: https://lore.kernel.org/r/164375212842.440833.6733971458765002128.stgit@brunhilda.pdev.net
Reviewed-by: Kevin Barnett <kevin.barnett@microchip.com>
Reviewed-by: Mike McGowen <mike.mcgowen@microchip.com>
Reviewed-by: Scott Benesh <scott.benesh@microchip.com>
Reviewed-by: Scott Teel <scott.teel@microchip.com>
Signed-off-by: Mike McGowen <Mike.McGowen@microchip.com>
Signed-off-by: Don Brace <don.brace@microchip.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/smartpqi/smartpqi.h b/drivers/scsi/smartpqi/smartpqi.h
index 4f6e488..826c400 100644 (file)
--- a/drivers/scsi/smartpqi/smartpqi.h
+++ b/drivers/scsi/smartpqi/smartpqi.h
@@ -918,7 +918,8 @@ union pqi_reset_register {
 #define PQI_MAX_TRANSFER_SIZE                  (1024U * 1024U)
 #define PQI_MAX_TRANSFER_SIZE_KDUMP            (512 * 1024U)
 
-#define RAID_MAP_MAX_ENTRIES           1024
+#define RAID_MAP_MAX_ENTRIES                   1024
+#define RAID_MAP_MAX_DATA_DISKS_PER_ROW                128
 
 #define PQI_PHYSICAL_DEVICE_BUS                0
 #define PQI_RAID_VOLUME_BUS            1
@@ -1125,7 +1126,7 @@ struct pqi_scsi_dev {
        u8      ncq_prio_support;
        bool    raid_bypass_configured; /* RAID bypass configured */
        bool    raid_bypass_enabled;    /* RAID bypass enabled */
-       u32     next_bypass_group;
+       u32     next_bypass_group[RAID_MAP_MAX_DATA_DISKS_PER_ROW];
        struct raid_map *raid_map;      /* RAID bypass map */
        u32     max_transfer_encrypted;
 

diff --git a/drivers/scsi/smartpqi/smartpqi_init.c b/drivers/scsi/smartpqi/smartpqi_init.c
index 8bd4de6..18c6952 100644 (file)
--- a/drivers/scsi/smartpqi/smartpqi_init.c
+++ b/drivers/scsi/smartpqi/smartpqi_init.c
@@ -2058,7 +2058,7 @@ static void pqi_scsi_update_device(struct pqi_ctrl_info *ctrl_info,
                sizeof(existing_device->box));
        memcpy(existing_device->phys_connector, new_device->phys_connector,
                sizeof(existing_device->phys_connector));
-       existing_device->next_bypass_group = 0;
+       memset(existing_device->next_bypass_group, 0, sizeof(existing_device->next_bypass_group));
        kfree(existing_device->raid_map);
        existing_device->raid_map = new_device->raid_map;
        existing_device->raid_bypass_configured =
@@ -2963,11 +2963,11 @@ static int pqi_raid_bypass_submit_scsi_cmd(struct pqi_ctrl_info *ctrl_info,
                if (rmd.is_write) {
                        pqi_calc_aio_r1_nexus(raid_map, &rmd);
                } else {
-                       group = device->next_bypass_group;
+                       group = device->next_bypass_group[rmd.map_index];
                        next_bypass_group = group + 1;
                        if (next_bypass_group >= rmd.layout_map_count)
                                next_bypass_group = 0;
-                       device->next_bypass_group = next_bypass_group;
+                       device->next_bypass_group[rmd.map_index] = next_bypass_group;
                        rmd.map_index += group * rmd.data_disks_per_row;
                }
        } else if ((device->raid_level == SA_RAID_5 ||