[SCSI] qla4xxx: Boot from SAN support for open-iscsi

Hook qla4xxx in fw boot sysfs interface so iscsi tools
can use the info to create boot sessions.

Signed-off-by: Manish Rangankar <manish.rangankar@qlogic.com>
Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 77 insertions, 0 deletions

diff --git a/drivers/scsi/qla4xxx/ql4_mbx.c b/drivers/scsi/qla4xxx/ql4_mbx.c
index 21884019dab8..72ec7e092296 100644
--- a/drivers/scsi/qla4xxx/ql4_mbx.c
+++ b/drivers/scsi/qla4xxx/ql4_mbx.c
@@ -1262,6 +1262,83 @@ int qla4xxx_set_flash(struct scsi_qla_host *ha, dma_addr_t dma_addr,
         return status;
 }
 
+int qla4xxx_bootdb_by_index(struct scsi_qla_host *ha,
+                            struct dev_db_entry *fw_ddb_entry,
+                            dma_addr_t fw_ddb_entry_dma, uint16_t ddb_index)
+{
+        uint32_t dev_db_start_offset = FLASH_OFFSET_DB_INFO;
+        uint32_t dev_db_end_offset;
+        int status = QLA_ERROR;
+
+        memset(fw_ddb_entry, 0, sizeof(*fw_ddb_entry));
+
+        dev_db_start_offset += (ddb_index * sizeof(*fw_ddb_entry));
+        dev_db_end_offset = FLASH_OFFSET_DB_END;
+
+        if (dev_db_start_offset > dev_db_end_offset) {
+                DEBUG2(ql4_printk(KERN_ERR, ha,
+                                  "%s:Invalid DDB index %d", __func__,
+                                  ddb_index));
+                goto exit_bootdb_failed;
+        }
+
+        if (qla4xxx_get_flash(ha, fw_ddb_entry_dma, dev_db_start_offset,
+                              sizeof(*fw_ddb_entry)) != QLA_SUCCESS) {
+                ql4_printk(KERN_ERR, ha, "scsi%ld: %s: Get Flash"
+                           "failed\n", ha->host_no, __func__);
+                goto exit_bootdb_failed;
+        }
+
+        if (fw_ddb_entry->cookie == DDB_VALID_COOKIE)
+                status = QLA_SUCCESS;
+
+exit_bootdb_failed:
+        return status;
+}
+
+int qla4xxx_get_chap(struct scsi_qla_host *ha, char *username, char *password,
+                     uint16_t idx)
+{
+        int ret = 0;
+        int rval = QLA_ERROR;
+        uint32_t offset = 0;
+        struct ql4_chap_table *chap_table;
+        dma_addr_t chap_dma;
+
+        chap_table = dma_pool_alloc(ha->chap_dma_pool, GFP_KERNEL, &chap_dma);
+        if (chap_table == NULL) {
+                ret = -ENOMEM;
+                goto exit_get_chap;
+        }
+
+        memset(chap_table, 0, sizeof(struct ql4_chap_table));
+
+        offset = 0x06000000 | (idx * sizeof(struct ql4_chap_table));
+
+        rval = qla4xxx_get_flash(ha, chap_dma, offset,
+                                 sizeof(struct ql4_chap_table));
+        if (rval != QLA_SUCCESS) {
+                ret = -EINVAL;
+                goto exit_get_chap;
+        }
+
+        DEBUG2(ql4_printk(KERN_INFO, ha, "Chap Cookie: x%x\n",
+                __le16_to_cpu(chap_table->cookie)));
+
+        if (__le16_to_cpu(chap_table->cookie) != CHAP_VALID_COOKIE) {
+                ql4_printk(KERN_ERR, ha, "No valid chap entry found\n");
+                goto exit_get_chap;
+        }
+
+        strncpy(password, chap_table->secret, QL4_CHAP_MAX_SECRET_LEN);
+        strncpy(username, chap_table->name, QL4_CHAP_MAX_NAME_LEN);
+        chap_table->cookie = __constant_cpu_to_le16(CHAP_VALID_COOKIE);
+
+exit_get_chap:
+        dma_pool_free(ha->chap_dma_pool, chap_table, chap_dma);
+        return ret;
+}
+
 static int qla4xxx_set_chap(struct scsi_qla_host *ha, char *username,
                             char *password, uint16_t idx, int bidi)
 {