From 2ecb204d07ac8debe3893c362415919bc78bebd6 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Mon, 3 Nov 2014 14:09:02 +0100 Subject: scsi: always assign block layer tags if enabled Allow a driver to ask for block layer tags by setting .use_blk_tags in the host template, in which case it will always see a valid value in request->tag, similar to the behavior when using blk-mq. This means even SCSI "untagged" commands will now have a tag, which is especially useful when using a host-wide tag map. Signed-off-by: Christoph Hellwig Reviewed-by: Mike Christie Reviewed-by: Martin K. Petersen Reviewed-by: Hannes Reinecke --- drivers/scsi/qla4xxx/ql4_os.c | 10 ++-------- 1 file changed, 2 insertions(+), 8 deletions(-) (limited to 'drivers/scsi/qla4xxx/ql4_os.c') diff --git a/drivers/scsi/qla4xxx/ql4_os.c b/drivers/scsi/qla4xxx/ql4_os.c index 199fcf7..f3119c1 100644 --- a/drivers/scsi/qla4xxx/ql4_os.c +++ b/drivers/scsi/qla4xxx/ql4_os.c @@ -163,7 +163,6 @@ static int qla4xxx_eh_target_reset(struct scsi_cmnd *cmd); static int qla4xxx_eh_host_reset(struct scsi_cmnd *cmd); static int qla4xxx_slave_alloc(struct scsi_device *device); static int qla4xxx_slave_configure(struct scsi_device *device); -static void qla4xxx_slave_destroy(struct scsi_device *sdev); static umode_t qla4_attr_is_visible(int param_type, int param); static int qla4xxx_host_reset(struct Scsi_Host *shost, int reset_type); static int qla4xxx_change_queue_depth(struct scsi_device *sdev, int qdepth, @@ -206,7 +205,6 @@ static struct scsi_host_template qla4xxx_driver_template = { .slave_configure = qla4xxx_slave_configure, .slave_alloc = qla4xxx_slave_alloc, - .slave_destroy = qla4xxx_slave_destroy, .change_queue_depth = qla4xxx_change_queue_depth, .this_id = -1, @@ -218,6 +216,7 @@ static struct scsi_host_template qla4xxx_driver_template = { .shost_attrs = qla4xxx_host_attrs, .host_reset = qla4xxx_host_reset, .vendor_id = SCSI_NL_VID_TYPE_PCI | PCI_VENDOR_ID_QLOGIC, + .use_blk_tags = 1, }; static struct iscsi_transport qla4xxx_iscsi_transport = { @@ -9065,7 +9064,7 @@ static int qla4xxx_slave_alloc(struct scsi_device *sdev) if (ql4xmaxqdepth != 0 && ql4xmaxqdepth <= 0xffffU) queue_depth = ql4xmaxqdepth; - scsi_activate_tcq(sdev, queue_depth); + scsi_adjust_queue_depth(sdev, 0, queue_depth); return 0; } @@ -9075,11 +9074,6 @@ static int qla4xxx_slave_configure(struct scsi_device *sdev) return 0; } -static void qla4xxx_slave_destroy(struct scsi_device *sdev) -{ - scsi_deactivate_tcq(sdev, 1); -} - static int qla4xxx_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason) { -- cgit v1.1 From c8b09f6fb67df7fc1b51ced1037fa9b677428149 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Mon, 3 Nov 2014 20:15:14 +0100 Subject: scsi: don't set tagging state from scsi_adjust_queue_depth Remove the tagged argument from scsi_adjust_queue_depth, and just let it handle the queue depth. For most drivers those two are fairly separate, given that most modern drivers don't care about the SCSI "tagged" status of a command at all, and many old drivers allow queuing of multiple untagged commands in the driver. Instead we start out with the ->simple_tags flag set before calling ->slave_configure, which is how all drivers actually looking at ->simple_tags except for one worke anyway. The one other case looks broken, but I've kept the behavior as-is for now. Except for that we only change ->simple_tags from the ->change_queue_type, and when rejecting a tag message in a single driver, so keeping this churn out of scsi_adjust_queue_depth is a clear win. Now that the usage of scsi_adjust_queue_depth is more obvious we can also remove all the trivial instances in ->slave_alloc or ->slave_configure that just set it to the cmd_per_lun default. Signed-off-by: Christoph Hellwig Reviewed-by: Mike Christie Reviewed-by: Hannes Reinecke Reviewed-by: Martin K. Petersen --- drivers/scsi/qla4xxx/ql4_os.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/scsi/qla4xxx/ql4_os.c') diff --git a/drivers/scsi/qla4xxx/ql4_os.c b/drivers/scsi/qla4xxx/ql4_os.c index f3119c1..784f59e 100644 --- a/drivers/scsi/qla4xxx/ql4_os.c +++ b/drivers/scsi/qla4xxx/ql4_os.c @@ -9064,7 +9064,7 @@ static int qla4xxx_slave_alloc(struct scsi_device *sdev) if (ql4xmaxqdepth != 0 && ql4xmaxqdepth <= 0xffffU) queue_depth = ql4xmaxqdepth; - scsi_adjust_queue_depth(sdev, 0, queue_depth); + scsi_adjust_queue_depth(sdev, queue_depth); return 0; } -- cgit v1.1 From ee11560f3ad150a1108d261cbff4fd617cc3fa09 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Mon, 3 Nov 2014 20:40:56 +0100 Subject: scsi: don't force tagged_supported in drivers Now that we also get proper values in cmd->request->tag for untagged commands, there is no need to force tagged_supported to on in drivers that need host-wide tags. Signed-off-by: Christoph Hellwig Reviewed-by: Mike Christie Reviewed-by: Hannes Reinecke --- drivers/scsi/qla4xxx/ql4_os.c | 9 --------- 1 file changed, 9 deletions(-) (limited to 'drivers/scsi/qla4xxx/ql4_os.c') diff --git a/drivers/scsi/qla4xxx/ql4_os.c b/drivers/scsi/qla4xxx/ql4_os.c index 784f59e..f8724f2 100644 --- a/drivers/scsi/qla4xxx/ql4_os.c +++ b/drivers/scsi/qla4xxx/ql4_os.c @@ -162,7 +162,6 @@ static int qla4xxx_eh_device_reset(struct scsi_cmnd *cmd); static int qla4xxx_eh_target_reset(struct scsi_cmnd *cmd); static int qla4xxx_eh_host_reset(struct scsi_cmnd *cmd); static int qla4xxx_slave_alloc(struct scsi_device *device); -static int qla4xxx_slave_configure(struct scsi_device *device); static umode_t qla4_attr_is_visible(int param_type, int param); static int qla4xxx_host_reset(struct Scsi_Host *shost, int reset_type); static int qla4xxx_change_queue_depth(struct scsi_device *sdev, int qdepth, @@ -203,7 +202,6 @@ static struct scsi_host_template qla4xxx_driver_template = { .eh_host_reset_handler = qla4xxx_eh_host_reset, .eh_timed_out = qla4xxx_eh_cmd_timed_out, - .slave_configure = qla4xxx_slave_configure, .slave_alloc = qla4xxx_slave_alloc, .change_queue_depth = qla4xxx_change_queue_depth, @@ -9059,7 +9057,6 @@ static int qla4xxx_slave_alloc(struct scsi_device *sdev) ddb = sess->dd_data; sdev->hostdata = ddb; - sdev->tagged_supported = 1; if (ql4xmaxqdepth != 0 && ql4xmaxqdepth <= 0xffffU) queue_depth = ql4xmaxqdepth; @@ -9068,12 +9065,6 @@ static int qla4xxx_slave_alloc(struct scsi_device *sdev) return 0; } -static int qla4xxx_slave_configure(struct scsi_device *sdev) -{ - sdev->tagged_supported = 1; - return 0; -} - static int qla4xxx_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason) { -- cgit v1.1