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Subject[PATCH 08/14] target/spc: Expose ATO bit in control mode page
Date
From: Nicholas Bellinger <nab@linux-iscsi.org>

This patch updates spc_modesense_control() to set the Application
Tag Owner (ATO) bit when when DIF emulation is enabled by the
backend device.

Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Sagi Grimberg <sagig@mellanox.com>
Cc: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
---
drivers/target/target_core_spc.c | 13 +++++++++++++
1 file changed, 13 insertions(+)

diff --git a/drivers/target/target_core_spc.c b/drivers/target/target_core_spc.c
index d99eb95..4360c80 100644
--- a/drivers/target/target_core_spc.c
+++ b/drivers/target/target_core_spc.c
@@ -799,6 +799,19 @@ static int spc_modesense_control(struct se_device *dev, u8 pc, u8 *p)
* status (see SAM-4).
*/
p[5] = (dev->dev_attrib.emulate_tas) ? 0x40 : 0x00;
+ /*
+ * From spc4r30, section 7.5.7 Control mode page
+ *
+ * Application Tag Owner (ATO) bit set to one.
+ *
+ * If the ATO bit is set to one the device server shall not modify the
+ * LOGICAL BLOCK APPLICATION TAG field and, depending on the protection
+ * type, shall not modify the contents of the LOGICAL BLOCK REFERENCE
+ * TAG field.
+ */
+ if (dev->dev_attrib.pi_prot_type)
+ p[5] |= 0x80;
+
p[8] = 0xff;
p[9] = 0xff;
p[11] = 30;
--
1.7.10.4


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