diff options
| author |   Hannes Reinecke <hare@suse.com> | 2020-08-19 23:20:30 +0800 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2020-10-06 08:33:44 -0600 |
| commit | bdb01301f3ea51a59eff252b06643fc1fe843e57 (patch) | |
| tree | 59da9b6e0a1b2648159e9780ff527529395c9efe /include/scsi | |
| parent | block: scsi_ioctl: Avoid the use of one-element arrays (diff) | |
| download | linux-dev-bdb01301f3ea51a59eff252b06643fc1fe843e57.tar.xz linux-dev-bdb01301f3ea51a59eff252b06643fc1fe843e57.zip | |
scsi: Add host and host template flag 'host_tagset'
Add Host and host template flag 'host_tagset' so hostwide tagset can be
shared on multiple reply queues after the SCSI device's reply queue is
converted to blk-mq hw queue.
[jpg: Update comment on .can_queue and add Scsi_Host.host_tagset]
Signed-off-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Tested-by: Don Brace<don.brace@microsemi.com> #SCSI resv cmds patches used
Tested-by: Douglas Gilbert <dgilbert@interlog.com>
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/scsi')
| -rw-r--r-- | include/scsi/scsi_host.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h index 46ef8cccc982..701f178b20ae 100644 --- a/include/scsi/scsi_host.h +++ b/include/scsi/scsi_host.h @@ -436,6 +436,9 @@ struct scsi_host_template { /* True if the controller does not support WRITE SAME */ unsigned no_write_same:1; + /* True if the host uses host-wide tagspace */ + unsigned host_tagset:1; + /* * Countdown for host blocking with no commands outstanding. */ @@ -603,7 +606,8 @@ struct Scsi_Host { * * Note: it is assumed that each hardware queue has a queue depth of * can_queue. In other words, the total queue depth per host - * is nr_hw_queues * can_queue. + * is nr_hw_queues * can_queue. However, for when host_tagset is set, + * the total queue depth is can_queue. */ unsigned nr_hw_queues; unsigned active_mode:2; @@ -634,6 +638,9 @@ struct Scsi_Host { /* The controller does not support WRITE SAME */ unsigned no_write_same:1; + /* True if the host uses host-wide tagspace */ + unsigned host_tagset:1; + /* Host responded with short (<36 bytes) INQUIRY result */ unsigned short_inquiry:1; |