[SCSI] qla4xxx: Do not add duplicate CHAP entry in FLASH

QLogic applications store the CHAP information in FLASH. During login,
authentication information is provided using an index into the CHAP region.

In order to support QLogic applications along with iscsiadm, updated the
LLD to not add duplicate CHAP entries in the CHAP region and preserve the
existing CHAP info in the CHAP region in FLASH.
This allows QLogic applications to pre-write the CHAP entries in the
CHAP region.

With iscsiadm, when the CHAP authentication information is sent to the LLD, the
LLD searches for the entry in CHAP region in FLASH, if exists then do not add.
If CHAP entry does not exist then add the CHAP entry in the CHAP region.

JIRA Key: UPSISCSI-146

Signed-off-by: Lalit Chandivade <lalit.chandivade@qlogic.com>
Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/scsi/qla4xxx/ql4_nx.c b/drivers/scsi/qla4xxx/ql4_nx.c
index 84c254afac0a..f484ff438199 100644
--- a/drivers/scsi/qla4xxx/ql4_nx.c
+++ b/drivers/scsi/qla4xxx/ql4_nx.c
@@ -2024,6 +2024,10 @@ qla4_8xxx_get_flt_info(struct scsi_qla_host *ha, uint32_t flt_addr)
                 case FLT_REG_ISCSI_PARAM:
                         hw->flt_iscsi_param =  start;
                         break;
+                case FLT_REG_ISCSI_CHAP:
+                        hw->flt_region_chap =  start;
+                        hw->flt_chap_size =  le32_to_cpu(region->size);
+                        break;
                 }
         }
         goto done;
@@ -2036,6 +2040,9 @@ no_flash_data:
         hw->flt_region_boot     = FA_BOOT_CODE_ADDR_82;
         hw->flt_region_bootload = FA_BOOT_LOAD_ADDR_82;
         hw->flt_region_fw       = FA_RISC_CODE_ADDR_82;
+        hw->flt_region_chap     = FA_FLASH_ISCSI_CHAP;
+        hw->flt_chap_size       = FA_FLASH_CHAP_SIZE;
+
 done:
         DEBUG2(ql4_printk(KERN_INFO, ha, "FLT[%s]: flt=0x%x fdt=0x%x "
             "boot=0x%x bootload=0x%x fw=0x%x\n", loc, hw->flt_region_flt,