target/spc: Only expose PI inquiry bits when supported by fabric

Only expose standard INQUIRY PROTECT=1 and EVPD=0x86 TYPE1/TYPE3
PI control bits if the session + fabric support DIX PASS operations.

Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Or Gerlitz <ogerlitz@mellanox.com>
Cc: Quinn Tran <quinn.tran@qlogic.com>
Cc: Giridhar Malavali <giridhar.malavali@qlogic.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

1 files changed, 14 insertions, 7 deletions

diff --git a/drivers/target/target_core_spc.c b/drivers/target/target_core_spc.c
index 3bebc71ea033..d4c6a318d4c2 100644
--- a/drivers/target/target_core_spc.c
+++ b/drivers/target/target_core_spc.c
@@ -71,6 +71,7 @@ spc_emulate_inquiry_std(struct se_cmd *cmd, unsigned char *buf)
 {
         struct se_lun *lun = cmd->se_lun;
         struct se_device *dev = cmd->se_dev;
+        struct se_session *sess = cmd->se_sess;
 
         /* Set RMB (removable media) for tape devices */
         if (dev->transport->get_device_type(dev) == TYPE_TAPE)
@@ -101,10 +102,13 @@ spc_emulate_inquiry_std(struct se_cmd *cmd, unsigned char *buf)
         if (dev->dev_attrib.emulate_3pc)
                 buf[5] |= 0x8;
         /*
-         * Set Protection (PROTECT) bit when DIF has been enabled.
+         * Set Protection (PROTECT) bit when DIF has been enabled on the
+         * device, and the transport supports VERIFY + PASS.
          */
-        if (dev->dev_attrib.pi_prot_type)
-                buf[5] |= 0x1;
+        if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
+                if (dev->dev_attrib.pi_prot_type)
+                        buf[5] |= 0x1;
+        }
 
         buf[7] = 0x2; /* CmdQue=1 */
 
@@ -473,16 +477,19 @@ static sense_reason_t
 spc_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf)
 {
         struct se_device *dev = cmd->se_dev;
+        struct se_session *sess = cmd->se_sess;
 
         buf[3] = 0x3c;
         /*
          * Set GRD_CHK + REF_CHK for TYPE1 protection, or GRD_CHK
          * only for TYPE3 protection.
          */
-        if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT)
-                buf[4] = 0x5;
-        else if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE3_PROT)
-                buf[4] = 0x4;
+        if (sess->sup_prot_ops & (TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS)) {
+                if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE1_PROT)
+                        buf[4] = 0x5;
+                else if (dev->dev_attrib.pi_prot_type == TARGET_DIF_TYPE3_PROT)
+                        buf[4] = 0x4;
+        }
 
         /* Set HEADSUP, ORDSUP, SIMPSUP */
         buf[5] = 0x07;