target/spc: Add protection related bits to INQUIRY EVPD=0x86

This patch updates spc_emulate_evpd_86() (extended INQUIRY) to
report GRD_CHK (Guard Check) and REF_CHK (Reference Check) bits
when DIF emulation is enabled by the backend device.

Reviewed-by: 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>

diff --git a/drivers/target/target_core_spc.c b/drivers/target/target_core_spc.c
index 4178c2a..73fdff5 100644 (file)
--- a/drivers/target/target_core_spc.c
+++ b/drivers/target/target_core_spc.c
@@ -475,6 +475,15 @@ spc_emulate_evpd_86(struct se_cmd *cmd, unsigned char *buf)
        struct se_device *dev = cmd->se_dev;
 
        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;
+
        /* Set HEADSUP, ORDSUP, SIMPSUP */
        buf[5] = 0x07;