[v2,6/6] scsi: target: core: dynamicaly set dpofua in usage_bits

Commit Message

Dmitry Bogdanov April 26, 2021, 12:51 p.m. UTC

libiscsi tests check the support of DPO & FUA bits in usage bits of RSOC
response.
This patch adds support of dynamic usage bits for each opcode.
Set support of DPO & FUA bits in usage_bits of RSOC response depending
on support DPOFUA in the backstore device.

Reviewed-by: Roman Bolshakov <[e-mail]>
Reviewed-by: Konstantin Shelekhin <[e-mail]>
Signed-off-by: Dmitry Bogdanov <[e-mail]>
---
 drivers/target/target_core_spc.c  | 34 +++++++++++++++++++++++++++++--
 include/target/target_core_base.h |  2 ++
 2 files changed, 34 insertions(+), 2 deletions(-)

Patch

diff --git a/drivers/target/target_core_spc.c b/drivers/target/target_core_spc.c
index 828251163cf0..a97a2f43a061 100644
--- a/drivers/target/target_core_spc.c
+++ b/drivers/target/target_core_spc.c
@@ -1308,6 +1308,22 @@  spc_emulate_testunitready(struct se_cmd *cmd)
 	return 0;
 }
 
+static void set_dpofua_usage_bits(u8 *usage_bits, struct se_device *dev)
+{
+	if (!target_check_fua(dev))
+		usage_bits[1] &= ~0x18;
+	else
+		usage_bits[1] |= 0x18;
+}
+
+static void set_dpofua_usage_bits32(u8 *usage_bits, struct se_device *dev)
+{
+	if (!target_check_fua(dev))
+		usage_bits[10] &= ~0x18;
+	else
+		usage_bits[10] |= 0x18;
+}
+
 static struct target_opcode_descriptor tcm_opcode_read6 = {
 	.support = SCSI_SUPPORT_FULL,
 	.opcode = READ_6,
@@ -1323,6 +1339,7 @@  static struct target_opcode_descriptor tcm_opcode_read10 = {
 	.usage_bits = {READ_10, 0xf8, 0xff, 0xff,
 		       0xff, 0xff, SCSI_GROUP_NUMBER_MASK, 0xff,
 		       0xff, SCSI_CONTROL_MASK},
+	.update_usage_bits = set_dpofua_usage_bits,
 };
 
 static struct target_opcode_descriptor tcm_opcode_read12 = {
@@ -1332,6 +1349,7 @@  static struct target_opcode_descriptor tcm_opcode_read12 = {
 	.usage_bits = {READ_12, 0xf8, 0xff, 0xff,
 		       0xff, 0xff, 0xff, 0xff,
 		       0xff, 0xff, SCSI_GROUP_NUMBER_MASK, SCSI_CONTROL_MASK},
+	.update_usage_bits = set_dpofua_usage_bits,
 };
 
 static struct target_opcode_descriptor tcm_opcode_read16 = {
@@ -1342,6 +1360,7 @@  static struct target_opcode_descriptor tcm_opcode_read16 = {
 		       0xff, 0xff, 0xff, 0xff,
 		       0xff, 0xff, 0xff, 0xff,
 		       0xff, 0xff, SCSI_GROUP_NUMBER_MASK, SCSI_CONTROL_MASK},
+	.update_usage_bits = set_dpofua_usage_bits,
 };
 
 static struct target_opcode_descriptor tcm_opcode_write6 = {
@@ -1359,6 +1378,7 @@  static struct target_opcode_descriptor tcm_opcode_write10 = {
 	.usage_bits = {WRITE_10, 0xf8, 0xff, 0xff,
 		       0xff, 0xff, SCSI_GROUP_NUMBER_MASK, 0xff,
 		       0xff, SCSI_CONTROL_MASK},
+	.update_usage_bits = set_dpofua_usage_bits,
 };
 
 static struct target_opcode_descriptor tcm_opcode_write_verify10 = {
@@ -1368,6 +1388,7 @@  static struct target_opcode_descriptor tcm_opcode_write_verify10 = {
 	.usage_bits = {WRITE_VERIFY, 0xf0, 0xff, 0xff,
 		       0xff, 0xff, SCSI_GROUP_NUMBER_MASK, 0xff,
 		       0xff, SCSI_CONTROL_MASK},
+	.update_usage_bits = set_dpofua_usage_bits,
 };
 
 static struct target_opcode_descriptor tcm_opcode_write12 = {
@@ -1377,6 +1398,7 @@  static struct target_opcode_descriptor tcm_opcode_write12 = {
 	.usage_bits = {WRITE_12, 0xf8, 0xff, 0xff,
 		       0xff, 0xff, 0xff, 0xff,
 		       0xff, 0xff, SCSI_GROUP_NUMBER_MASK, SCSI_CONTROL_MASK},
+	.update_usage_bits = set_dpofua_usage_bits,
 };
 
 static struct target_opcode_descriptor tcm_opcode_write16 = {
@@ -1387,6 +1409,7 @@  static struct target_opcode_descriptor tcm_opcode_write16 = {
 		       0xff, 0xff, 0xff, 0xff,
 		       0xff, 0xff, 0xff, 0xff,
 		       0xff, 0xff, SCSI_GROUP_NUMBER_MASK, SCSI_CONTROL_MASK},
+	.update_usage_bits = set_dpofua_usage_bits,
 };
 
 static struct target_opcode_descriptor tcm_opcode_write_verify16 = {
@@ -1397,6 +1420,7 @@  static struct target_opcode_descriptor tcm_opcode_write_verify16 = {
 		       0xff, 0xff, 0xff, 0xff,
 		       0xff, 0xff, 0xff, 0xff,
 		       0xff, 0xff, SCSI_GROUP_NUMBER_MASK, SCSI_CONTROL_MASK},
+	.update_usage_bits = set_dpofua_usage_bits,
 };
 
 static bool tcm_is_ws_enabled(struct se_cmd *cmd)
@@ -1423,6 +1447,7 @@  static struct target_opcode_descriptor tcm_opcode_write_same32 = {
 		       0x00, 0x00, 0x00, 0x00,
 		       0xff, 0xff, 0xff, 0xff},
 	.enabled = tcm_is_ws_enabled,
+	.update_usage_bits = set_dpofua_usage_bits32,
 };
 
 static bool tcm_is_caw_enabled(struct se_cmd *cmd)
@@ -1441,6 +1466,7 @@  static struct target_opcode_descriptor tcm_opcode_compare_write = {
 		       0xff, 0xff, 0x00, 0x00,
 		       0x00, 0xff, SCSI_GROUP_NUMBER_MASK, SCSI_CONTROL_MASK},
 	.enabled = tcm_is_caw_enabled,
+	.update_usage_bits = set_dpofua_usage_bits,
 };
 
 static struct target_opcode_descriptor tcm_opcode_read_capacity = {
@@ -2027,7 +2053,8 @@  spc_rsoc_encode_command_descriptor(unsigned char *buf, u8 ctdp,
 
 static int
 spc_rsoc_encode_one_command_descriptor(unsigned char *buf, u8 ctdp,
-				       struct target_opcode_descriptor *descr)
+				       struct target_opcode_descriptor *descr,
+				       struct se_device *dev)
 {
 	int td_size = 0;
 
@@ -2039,6 +2066,8 @@  spc_rsoc_encode_one_command_descriptor(unsigned char *buf, u8 ctdp,
 	buf[1] = (ctdp << 7) | SCSI_SUPPORT_FULL;
 	put_unaligned_be16(descr->cdb_size, &buf[2]);
 	memcpy(&buf[4], descr->usage_bits, descr->cdb_size);
+	if (descr->update_usage_bits)
+		descr->update_usage_bits(&buf[4], dev);
 
 	td_size = spc_rsoc_encode_command_timeouts_descriptor(
 			&buf[4 + descr->cdb_size], ctdp, descr);
@@ -2181,7 +2210,8 @@  spc_emulate_report_supp_op_codes(struct se_cmd *cmd)
 		put_unaligned_be32(response_length - 3, buf);
 	} else {
 		response_length = spc_rsoc_encode_one_command_descriptor(
-				&buf[response_length], rctd, descr);
+				&buf[response_length], rctd, descr,
+				cmd->se_dev);
 	}
 
 	memcpy(rbuf, buf, min_t(u32, response_length, cmd->data_length));
diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
index 062ee8b6c433..0c1e43980985 100644
--- a/include/target/target_core_base.h
+++ b/include/target/target_core_base.h
@@ -880,6 +880,8 @@  struct target_opcode_descriptor {
 	u16			nominal_timeout;
 	u16			recommended_timeout;
 	bool			(*enabled)(struct se_cmd *cmd);
+	void			(*update_usage_bits)(u8 *usage_bits,
+						     struct se_device *dev);
 	u8			usage_bits[];
 };