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authorHannes Reinecke <hare@suse.com>2020-08-19 18:20:30 +0300
committerJens Axboe <axboe@kernel.dk>2020-10-06 17:33:44 +0300
commitbdb01301f3ea51a59eff252b06643fc1fe843e57 (patch)
tree59da9b6e0a1b2648159e9780ff527529395c9efe /include/scsi
parentf5ace5ef37b1e1de49882248656f35c45e041585 (diff)
downloadlinux-bdb01301f3ea51a59eff252b06643fc1fe843e57.tar.xz
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.h9
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;