[SCSI] qla2xxx: T10 DIF - Fix incorrect error reporting.

This fix:
    - Disables app tag peeking; correct tag check will be added when the
      SCSI API is available.
    - Always derive ref_tag from scsi_get_lba()
    - Removes incorrect swap of FCP_LUN in FCP_CMND
    - Moves app-tag error check before ref-tag check. The reason being,
      currently there is no interface in SCSI to retrieve the app-tag
      for protection I/Os, so driver puts zero for app-tag in the
      firmware interface, but requests not to validate it, but when a
      ref-tag error is detected by firmware, it would put
      expected/actual tags for all the protection tags (guard/app/ref).
      As driver checks for app tag error first, a ref-tag error is
      incorrectly flagged as app-tag error.
    - Convert HBA specific checks to capability based.

Signed-off-by: Arun Easi <arun.easi@qlogic.com>
Signed-off-by: Chad Dupuis <chad.dupuis@qlogic.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 7 insertions, 6 deletions

diff --git a/drivers/scsi/qla2xxx/qla_isr.c b/drivers/scsi/qla2xxx/qla_isr.c
index 53339f10a598..ec53e87781a5 100644
--- a/drivers/scsi/qla2xxx/qla_isr.c
+++ b/drivers/scsi/qla2xxx/qla_isr.c
@@ -1534,25 +1534,26 @@ qla2x00_handle_dif_error(srb_t *sp, struct sts_entry_24xx *sts24)
                 return 1;
         }
 
-        /* check appl tag */
-        if (e_app_tag != a_app_tag) {
+        /* check ref tag */
+        if (e_ref_tag != a_ref_tag) {
                 scsi_build_sense_buffer(1, cmd->sense_buffer, ILLEGAL_REQUEST,
-                    0x10, 0x2);
+                    0x10, 0x3);
                 set_driver_byte(cmd, DRIVER_SENSE);
                 set_host_byte(cmd, DID_ABORT);
                 cmd->result |= SAM_STAT_CHECK_CONDITION << 1;
                 return 1;
         }
 
-        /* check ref tag */
-        if (e_ref_tag != a_ref_tag) {
+        /* check appl tag */
+        if (e_app_tag != a_app_tag) {
                 scsi_build_sense_buffer(1, cmd->sense_buffer, ILLEGAL_REQUEST,
-                    0x10, 0x3);
+                    0x10, 0x2);
                 set_driver_byte(cmd, DRIVER_SENSE);
                 set_host_byte(cmd, DID_ABORT);
                 cmd->result |= SAM_STAT_CHECK_CONDITION << 1;
                 return 1;
         }
+
         return 1;
 }