target: Update QUEUE ALGORITHM MODIFIER control page default

This patch adds the default 'Unrestricted reordering allowed' for SCSI
control mode page QUEUE ALGORITHM MODIFIER on a per se_device basis in
target_modesense_control() following spc4r23.  This includes a new
emuluate_rest_reord configfs attribute that currently (only) accepts
zero to signal 'Unrestricted reordering allowed' in control mode page
usage by the backend target device.

Reported-by: Roland Dreier <roland@purestorage.com>
Signed-off-by: Nicholas Bellinger <nab@risingtidesystems.com>

3 files changed, 4 insertions, 0 deletions

diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
index 8204c76ca12b..86ca35539b94 100644
--- a/include/target/target_core_base.h
+++ b/include/target/target_core_base.h
@@ -662,6 +662,7 @@ struct se_dev_attrib {
         int             emulate_alua;
         int             enforce_pr_isids;
         int             is_nonrot;
+        int             emulate_rest_reord;
         u32             hw_block_size;
         u32             block_size;
         u32             hw_max_sectors;
diff --git a/include/target/target_core_device.h b/include/target/target_core_device.h
index f3b6ae655454..46571912086c 100644
--- a/include/target/target_core_device.h
+++ b/include/target/target_core_device.h
@@ -40,6 +40,7 @@ extern int se_dev_set_emulate_tpu(struct se_device *, int);
 extern int se_dev_set_emulate_tpws(struct se_device *, int);
 extern int se_dev_set_enforce_pr_isids(struct se_device *, int);
 extern int se_dev_set_is_nonrot(struct se_device *, int);
+extern int se_dev_set_emulate_rest_reord(struct se_device *dev, int);
 extern int se_dev_set_queue_depth(struct se_device *, u32);
 extern int se_dev_set_max_sectors(struct se_device *, u32);
 extern int se_dev_set_optimal_sectors(struct se_device *, u32);
diff --git a/include/target/target_core_transport.h b/include/target/target_core_transport.h
index 54af39d8e3fb..f41b07c7401e 100644
--- a/include/target/target_core_transport.h
+++ b/include/target/target_core_transport.h
@@ -103,6 +103,8 @@
 #define DA_STATUS_MAX_SECTORS_MAX               8192
 /* By default don't report non-rotating (solid state) medium */
 #define DA_IS_NONROT                            0
+/* Queue Algorithm Modifier default for restricted reordering in control mode page */
+#define DA_EMULATE_REST_REORD                   0
 
 #define SE_MODE_PAGE_BUF                        512