[SCSI] qla4xxx: support iscsiadm session mgmt

Add scsi_transport_iscsi hooks in qla4xxx to support
iSCSI session management using iscsiadm.

This patch is based on discussion here
http://groups.google.com/group/open-iscsi/browse_thread/thread/e89fd888baf656a0#

Now users can use iscsiadm to do target discovery and do login/logout to
individual targets using the qla4xxx iSCSI class interface.

This patch leaves some dead code, but to make it easier to review
we are leaving and in the next patch we will remove that old code.

V2 - NOTE: Added code to avoid waiting for AEN during login/logout
in the driver, instead added a kernel to user event
to notify iscsid about login status. Because of this
iscsid will not get blocked.

Signed-off-by: Manish Rangankar <manish.rangankar@qlogic.com>
Signed-off-by: Lalit Chandivade <lalit.chandivade@qlogic.com>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 333 insertions, 27 deletions

diff --git a/drivers/scsi/qla4xxx/ql4_mbx.c b/drivers/scsi/qla4xxx/ql4_mbx.c
index ea04b6cecfa..32e40cb534f 100644
--- a/drivers/scsi/qla4xxx/ql4_mbx.c
+++ b/drivers/scsi/qla4xxx/ql4_mbx.c
@@ -477,10 +477,11 @@ int qla4xxx_initialize_fw_cb(struct scsi_qla_host * ha)
 
 	init_fw_cb->fw_options &= __constant_cpu_to_le16(~FWOPT_TARGET_MODE);
 
-	/* Set bit for "serialize task mgmt" all other bits need to be zero */
 	init_fw_cb->add_fw_options = 0;
 	init_fw_cb->add_fw_options |=
-	    __constant_cpu_to_le16(SERIALIZE_TASK_MGMT);
+			__constant_cpu_to_le16(ADFWOPT_SERIALIZE_TASK_MGMT);
+	init_fw_cb->add_fw_options |=
+			__constant_cpu_to_le16(ADFWOPT_AUTOCONN_DISABLE);
 
 	if (qla4xxx_set_ifcb(ha, &mbox_cmd[0], &mbox_sts[0], init_fw_cb_dma)
 		!= QLA_SUCCESS) {
@@ -706,19 +707,38 @@ exit_get_fwddb:
 	return status;
 }
 
+int qla4xxx_conn_open(struct scsi_qla_host *ha, uint16_t fw_ddb_index)
+{
+	uint32_t mbox_cmd[MBOX_REG_COUNT];
+	uint32_t mbox_sts[MBOX_REG_COUNT];
+	int status;
+
+	memset(&mbox_cmd, 0, sizeof(mbox_cmd));
+	memset(&mbox_sts, 0, sizeof(mbox_sts));
+
+	mbox_cmd[0] = MBOX_CMD_CONN_OPEN;
+	mbox_cmd[1] = fw_ddb_index;
+
+	status = qla4xxx_mailbox_command(ha, MBOX_REG_COUNT, 2, &mbox_cmd[0],
+					 &mbox_sts[0]);
+	DEBUG2(ql4_printk(KERN_INFO, ha,
+			  "%s: status = %d mbx0 = 0x%x mbx1 = 0x%x\n",
+			  __func__, status, mbox_sts[0], mbox_sts[1]));
+	return status;
+}
+
 /**
  * qla4xxx_set_fwddb_entry - sets a ddb entry.
  * @ha: Pointer to host adapter structure.
  * @fw_ddb_index: Firmware's device database index
- * @fw_ddb_entry: Pointer to firmware's ddb entry structure, or NULL.
+ * @fw_ddb_entry_dma: dma address of ddb entry
+ * @mbx_sts: mailbox 0 to be returned or NULL
  *
  * This routine initializes or updates the adapter's device database
- * entry for the specified device. It also triggers a login for the
- * specified device. Therefore, it may also be used as a secondary
- * login routine when a NULL pointer is specified for the fw_ddb_entry.
+ * entry for the specified device.
  **/
 int qla4xxx_set_ddb_entry(struct scsi_qla_host * ha, uint16_t fw_ddb_index,
-			  dma_addr_t fw_ddb_entry_dma)
+			  dma_addr_t fw_ddb_entry_dma, uint32_t *mbx_sts)
 {
 	uint32_t mbox_cmd[MBOX_REG_COUNT];
 	uint32_t mbox_sts[MBOX_REG_COUNT];
@@ -737,13 +757,41 @@ int qla4xxx_set_ddb_entry(struct scsi_qla_host * ha, uint16_t fw_ddb_index,
 	mbox_cmd[4] = sizeof(struct dev_db_entry);
 
 	status = qla4xxx_mailbox_command(ha, MBOX_REG_COUNT, 5, &mbox_cmd[0],
-	    &mbox_sts[0]);
+					 &mbox_sts[0]);
+	if (mbx_sts)
+		*mbx_sts = mbox_sts[0];
 	DEBUG2(printk("scsi%ld: %s: status=%d mbx0=0x%x mbx4=0x%x\n",
 	    ha->host_no, __func__, status, mbox_sts[0], mbox_sts[4]);)
 
 	return status;
 }
 
+int qla4xxx_session_logout_ddb(struct scsi_qla_host *ha,
+			       struct ddb_entry *ddb_entry, int options)
+{
+	int status;
+	uint32_t mbox_cmd[MBOX_REG_COUNT];
+	uint32_t mbox_sts[MBOX_REG_COUNT];
+
+	memset(&mbox_cmd, 0, sizeof(mbox_cmd));
+	memset(&mbox_sts, 0, sizeof(mbox_sts));
+
+	mbox_cmd[0] = MBOX_CMD_CONN_CLOSE_SESS_LOGOUT;
+	mbox_cmd[1] = ddb_entry->fw_ddb_index;
+	mbox_cmd[3] = options;
+
+	status = qla4xxx_mailbox_command(ha, MBOX_REG_COUNT, 2, &mbox_cmd[0],
+					 &mbox_sts[0]);
+	if (status != QLA_SUCCESS) {
+		DEBUG2(ql4_printk(KERN_INFO, ha,
+				  "%s: MBOX_CMD_CONN_CLOSE_SESS_LOGOUT "
+				  "failed sts %04X %04X", __func__,
+				  mbox_sts[0], mbox_sts[1]));
+	}
+
+	return status;
+}
+
 /**
  * qla4xxx_get_crash_record - retrieves crash record.
  * @ha: Pointer to host adapter structure.
@@ -1119,7 +1167,7 @@ exit_about_fw:
 	return status;
 }
 
-static int qla4xxx_get_default_ddb(struct scsi_qla_host *ha,
+static int qla4xxx_get_default_ddb(struct scsi_qla_host *ha, uint32_t options,
 				   dma_addr_t dma_addr)
 {
 	uint32_t mbox_cmd[MBOX_REG_COUNT];
@@ -1129,6 +1177,7 @@ static int qla4xxx_get_default_ddb(struct scsi_qla_host *ha,
 	memset(&mbox_sts, 0, sizeof(mbox_sts));
 
 	mbox_cmd[0] = MBOX_CMD_GET_DATABASE_ENTRY_DEFAULTS;
+	mbox_cmd[1] = options;
 	mbox_cmd[2] = LSDW(dma_addr);
 	mbox_cmd[3] = MSDW(dma_addr);
 
@@ -1141,8 +1190,10 @@ static int qla4xxx_get_default_ddb(struct scsi_qla_host *ha,
 	return QLA_SUCCESS;
 }
 
-static int qla4xxx_req_ddb_entry(struct scsi_qla_host *ha, uint32_t *ddb_index)
+int qla4xxx_req_ddb_entry(struct scsi_qla_host *ha, uint32_t ddb_index,
+			  uint32_t *mbx_sts)
 {
+	int status;
 	uint32_t mbox_cmd[MBOX_REG_COUNT];
 	uint32_t mbox_sts[MBOX_REG_COUNT];
 
@@ -1150,30 +1201,26 @@ static int qla4xxx_req_ddb_entry(struct scsi_qla_host *ha, uint32_t *ddb_index)
 	memset(&mbox_sts, 0, sizeof(mbox_sts));
 
 	mbox_cmd[0] = MBOX_CMD_REQUEST_DATABASE_ENTRY;
-	mbox_cmd[1] = MAX_PRST_DEV_DB_ENTRIES;
+	mbox_cmd[1] = ddb_index;
 
-	if (qla4xxx_mailbox_command(ha, MBOX_REG_COUNT, 3, &mbox_cmd[0], &mbox_sts[0]) !=
-	    QLA_SUCCESS) {
-		if (mbox_sts[0] == MBOX_STS_COMMAND_ERROR) {
-			*ddb_index = mbox_sts[2];
-		} else {
-			DEBUG2(printk("scsi%ld: %s: failed status %04X\n",
-			     ha->host_no, __func__, mbox_sts[0]));
-			return QLA_ERROR;
-		}
-	} else {
-		*ddb_index = MAX_PRST_DEV_DB_ENTRIES;
+	status = qla4xxx_mailbox_command(ha, MBOX_REG_COUNT, 1, &mbox_cmd[0],
+					 &mbox_sts[0]);
+	if (status != QLA_SUCCESS) {
+		DEBUG2(ql4_printk(KERN_ERR, ha, "%s: failed status %04X\n",
+				   __func__, mbox_sts[0]));
 	}
 
-	return QLA_SUCCESS;
+	*mbx_sts = mbox_sts[0];
+	return status;
 }
 
-
 int qla4xxx_send_tgts(struct scsi_qla_host *ha, char *ip, uint16_t port)
 {
 	struct dev_db_entry *fw_ddb_entry;
 	dma_addr_t fw_ddb_entry_dma;
 	uint32_t ddb_index;
+	uint32_t mbx_sts;
+	uint32_t options = 0;
 	int ret_val = QLA_SUCCESS;
 
 
@@ -1187,11 +1234,11 @@ int qla4xxx_send_tgts(struct scsi_qla_host *ha, char *ip, uint16_t port)
 		goto exit_send_tgts_no_free;
 	}
 
-	ret_val = qla4xxx_get_default_ddb(ha, fw_ddb_entry_dma);
+	ret_val = qla4xxx_get_default_ddb(ha, options, fw_ddb_entry_dma);
 	if (ret_val != QLA_SUCCESS)
 		goto exit_send_tgts;
 
-	ret_val = qla4xxx_req_ddb_entry(ha, &ddb_index);
+	ret_val = qla4xxx_req_ddb_entry(ha, &ddb_index, &mbx_sts);
 	if (ret_val != QLA_SUCCESS)
 		goto exit_send_tgts;
 
@@ -1213,7 +1260,7 @@ int qla4xxx_send_tgts(struct scsi_qla_host *ha, char *ip, uint16_t port)
 	fw_ddb_entry->ip_addr[2] = *(ip + 2);
 	fw_ddb_entry->ip_addr[3] = *(ip + 3);
 
-	ret_val = qla4xxx_set_ddb_entry(ha, ddb_index, fw_ddb_entry_dma);
+	ret_val = qla4xxx_set_ddb_entry(ha, ddb_index, fw_ddb_entry_dma, NULL);
 
 exit_send_tgts:
 	dma_free_coherent(&ha->pdev->dev, sizeof(*fw_ddb_entry),
@@ -1222,6 +1269,28 @@ exit_send_tgts_no_free:
 	return ret_val;
 }
 
+int qla4xxx_clear_ddb_entry(struct scsi_qla_host *ha, uint32_t ddb_index)
+{
+	int status;
+	uint32_t mbox_cmd[MBOX_REG_COUNT];
+	uint32_t mbox_sts[MBOX_REG_COUNT];
+
+	memset(&mbox_cmd, 0, sizeof(mbox_cmd));
+	memset(&mbox_sts, 0, sizeof(mbox_sts));
+
+	mbox_cmd[0] = MBOX_CMD_CLEAR_DATABASE_ENTRY;
+	mbox_cmd[1] = ddb_index;
+
+	status = qla4xxx_mailbox_command(ha, 2, 1, &mbox_cmd[0],
+					 &mbox_sts[0]);
+	if (status != QLA_SUCCESS) {
+		DEBUG2(ql4_printk(KERN_ERR, ha, "%s: failed status %04X\n",
+				   __func__, mbox_sts[0]));
+	}
+
+	return status;
+}
+
 int qla4xxx_set_flash(struct scsi_qla_host *ha, dma_addr_t dma_addr,
 		      uint32_t offset, uint32_t length, uint32_t options)
 {
@@ -1248,6 +1317,42 @@ int qla4xxx_set_flash(struct scsi_qla_host *ha, dma_addr_t dma_addr,
 	return status;
 }
 
+static int qla4xxx_set_chap(struct scsi_qla_host *ha, char *username,
+			    char *password, uint16_t idx, int bidi)
+{
+	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_set_chap;
+	}
+
+	memset(chap_table, 0, sizeof(struct ql4_chap_table));
+	if (bidi)
+		chap_table->flags |= BIT_6; /* peer */
+	else
+		chap_table->flags |= BIT_7; /* local */
+	chap_table->secret_len = strlen(password);
+	strncpy(chap_table->secret, password, MAX_CHAP_SECRET_LEN);
+	strncpy(chap_table->name, username, MAX_CHAP_NAME_LEN);
+	chap_table->cookie = __constant_cpu_to_le16(CHAP_VALID_COOKIE);
+	offset = 0x06000000 | (idx * sizeof(struct ql4_chap_table));
+	rval = qla4xxx_set_flash(ha, chap_dma, offset,
+				sizeof(struct ql4_chap_table),
+				FLASH_OPT_RMW_COMMIT);
+	dma_pool_free(ha->chap_dma_pool, chap_table, chap_dma);
+	if (rval != QLA_SUCCESS)
+		ret =  -EINVAL;
+
+exit_set_chap:
+	return ret;
+}
+
 int qla4xxx_conn_close_sess_logout(struct scsi_qla_host *ha,
 				   uint16_t fw_ddb_index,
 				   uint16_t connection_id,
@@ -1337,3 +1442,204 @@ int qla4xxx_set_acb(struct scsi_qla_host *ha, uint32_t *mbox_cmd,
 	}
 	return status;
 }
+
+int qla4xxx_set_param_ddbentry(struct scsi_qla_host *ha,
+			       struct ddb_entry *ddb_entry,
+			       struct iscsi_cls_conn *cls_conn,
+			       uint32_t *mbx_sts)
+{
+	struct dev_db_entry *fw_ddb_entry;
+	struct iscsi_conn *conn;
+	struct iscsi_session *sess;
+	struct qla_conn *qla_conn;
+	struct sockaddr *dst_addr;
+	dma_addr_t fw_ddb_entry_dma;
+	int status = QLA_SUCCESS;
+	int rval = 0;
+	struct sockaddr_in *addr;
+	struct sockaddr_in6 *addr6;
+	char *ip;
+	uint16_t iscsi_opts = 0;
+	uint32_t options = 0;
+	uint16_t idx;
+	int max_chap_entries = 0;
+
+	fw_ddb_entry = dma_alloc_coherent(&ha->pdev->dev, sizeof(*fw_ddb_entry),
+					  &fw_ddb_entry_dma, GFP_KERNEL);
+	if (!fw_ddb_entry) {
+		DEBUG2(ql4_printk(KERN_ERR, ha,
+				  "%s: Unable to allocate dma buffer.\n",
+				  __func__));
+		rval = -ENOMEM;
+		goto exit_set_param_no_free;
+	}
+
+	conn = cls_conn->dd_data;
+	qla_conn = conn->dd_data;
+	sess = conn->session;
+	dst_addr = &qla_conn->qla_ep->dst_addr;
+
+	if (dst_addr->sa_family == AF_INET6)
+		options |= IPV6_DEFAULT_DDB_ENTRY;
+
+	status = qla4xxx_get_default_ddb(ha, options, fw_ddb_entry_dma);
+	if (status == QLA_ERROR) {
+		rval = -EINVAL;
+		goto exit_set_param;
+	}
+
+	iscsi_opts = le16_to_cpu(fw_ddb_entry->iscsi_options);
+	memset(fw_ddb_entry->iscsi_alias, 0, sizeof(fw_ddb_entry->iscsi_alias));
+
+	memset(fw_ddb_entry->iscsi_name, 0, sizeof(fw_ddb_entry->iscsi_name));
+
+	if (sess->targetname != NULL) {
+		memcpy(fw_ddb_entry->iscsi_name, sess->targetname,
+		       min(strlen(sess->targetname),
+		       sizeof(fw_ddb_entry->iscsi_name)));
+	}
+
+	memset(fw_ddb_entry->ip_addr, 0, sizeof(fw_ddb_entry->ip_addr));
+	memset(fw_ddb_entry->tgt_addr, 0, sizeof(fw_ddb_entry->tgt_addr));
+
+	fw_ddb_entry->options =  DDB_OPT_TARGET | DDB_OPT_AUTO_SENDTGTS_DISABLE;
+
+	if (dst_addr->sa_family == AF_INET) {
+		addr = (struct sockaddr_in *)dst_addr;
+		ip = (char *)&addr->sin_addr;
+		memcpy(fw_ddb_entry->ip_addr, ip, IP_ADDR_LEN);
+		fw_ddb_entry->port = cpu_to_le16(ntohs(addr->sin_port));
+		DEBUG2(ql4_printk(KERN_INFO, ha,
+				  "%s: Destination Address [%pI4]: index [%d]\n",
+				   __func__, fw_ddb_entry->ip_addr,
+				  ddb_entry->fw_ddb_index));
+	} else if (dst_addr->sa_family == AF_INET6) {
+		addr6 = (struct sockaddr_in6 *)dst_addr;
+		ip = (char *)&addr6->sin6_addr;
+		memcpy(fw_ddb_entry->ip_addr, ip, IPv6_ADDR_LEN);
+		fw_ddb_entry->port = cpu_to_le16(ntohs(addr6->sin6_port));
+		fw_ddb_entry->options |= DDB_OPT_IPV6_DEVICE;
+		DEBUG2(ql4_printk(KERN_INFO, ha,
+				  "%s: Destination Address [%pI6]: index [%d]\n",
+				   __func__, fw_ddb_entry->ip_addr,
+				  ddb_entry->fw_ddb_index));
+	} else {
+		ql4_printk(KERN_ERR, ha,
+			   "%s: Failed to get IP Address\n",
+			   __func__);
+		rval = -EINVAL;
+		goto exit_set_param;
+	}
+
+	if (is_qla8022(ha))
+		max_chap_entries = MAX_CHAP_ENTRIES_82XX;
+	else
+		max_chap_entries = MAX_CHAP_ENTRIES_40XX;
+	/* CHAP */
+	if (sess->username != NULL && sess->password != NULL) {
+		if (strlen(sess->username) && strlen(sess->password)) {
+			iscsi_opts |= BIT_7;
+			idx = ddb_entry->fw_ddb_index * 2;
+			if (idx > max_chap_entries) {
+				ql4_printk(KERN_ERR, ha,
+					   "%s: Invalid ddb or chap index\n",
+					   __func__);
+				rval  = -EINVAL;
+				goto exit_set_param;
+			}
+
+			rval = qla4xxx_set_chap(ha, sess->username,
+						sess->password, idx, 0);
+			if (rval)
+				goto exit_set_param;
+
+			fw_ddb_entry->chap_tbl_idx = cpu_to_le16(idx);
+		}
+	}
+
+	if (sess->username_in != NULL && sess->password_in != NULL) {
+		/* Check if BIDI CHAP */
+		if (strlen(sess->username_in) && strlen(sess->password_in)) {
+			iscsi_opts |= BIT_4;
+			idx = (ddb_entry->fw_ddb_index * 2) + 1;
+			if (idx > max_chap_entries) {
+				ql4_printk(KERN_ERR, ha,
+					   "%s: Invalid ddb or bidi chap "
+					   "index\n", __func__);
+				rval  = -EINVAL;
+				goto exit_set_param;
+			}
+			rval = qla4xxx_set_chap(ha, sess->username_in,
+						sess->password_in, idx, 0);
+			if (rval)
+				goto exit_set_param;
+		}
+	}
+
+	if (sess->initial_r2t_en)
+		iscsi_opts |= BIT_10;
+
+	if (sess->imm_data_en)
+		iscsi_opts |= BIT_11;
+
+	fw_ddb_entry->iscsi_options = cpu_to_le16(iscsi_opts);
+
+	if (conn->max_recv_dlength)
+		fw_ddb_entry->iscsi_max_rcv_data_seg_len =
+		  __constant_cpu_to_le16((conn->max_recv_dlength / BYTE_UNITS));
+
+	if (sess->max_r2t)
+		fw_ddb_entry->iscsi_max_outsnd_r2t = cpu_to_le16(sess->max_r2t);
+
+	if (sess->first_burst)
+		fw_ddb_entry->iscsi_first_burst_len =
+		       __constant_cpu_to_le16((sess->first_burst / BYTE_UNITS));
+
+	if (sess->max_burst)
+		fw_ddb_entry->iscsi_max_burst_len =
+			__constant_cpu_to_le16((sess->max_burst / BYTE_UNITS));
+
+	if (sess->time2wait)
+		fw_ddb_entry->iscsi_def_time2wait =
+			cpu_to_le16(sess->time2wait);
+
+	if (sess->time2retain)
+		fw_ddb_entry->iscsi_def_time2retain =
+			cpu_to_le16(sess->time2retain);
+
+	status = qla4xxx_set_ddb_entry(ha, ddb_entry->fw_ddb_index,
+				       fw_ddb_entry_dma, mbx_sts);
+
+	if (status != QLA_SUCCESS)
+		rval = -EINVAL;
+exit_set_param:
+	dma_free_coherent(&ha->pdev->dev, sizeof(*fw_ddb_entry),
+			  fw_ddb_entry, fw_ddb_entry_dma);
+exit_set_param_no_free:
+	return rval;
+}
+
+int qla4xxx_get_mgmt_data(struct scsi_qla_host *ha, uint16_t fw_ddb_index,
+			  uint16_t stats_size, dma_addr_t stats_dma)
+{
+	int status = QLA_SUCCESS;
+	uint32_t mbox_cmd[MBOX_REG_COUNT];
+	uint32_t mbox_sts[MBOX_REG_COUNT];
+
+	memset(mbox_cmd, 0, sizeof(mbox_cmd[0]) * MBOX_REG_COUNT);
+	memset(mbox_sts, 0, sizeof(mbox_sts[0]) * MBOX_REG_COUNT);
+	mbox_cmd[0] = MBOX_CMD_GET_MANAGEMENT_DATA;
+	mbox_cmd[1] = fw_ddb_index;
+	mbox_cmd[2] = LSDW(stats_dma);
+	mbox_cmd[3] = MSDW(stats_dma);
+	mbox_cmd[4] = stats_size;
+
+	status = qla4xxx_mailbox_command(ha, 5, 1, &mbox_cmd[0], &mbox_sts[0]);
+	if (status != QLA_SUCCESS) {
+		DEBUG2(ql4_printk(KERN_WARNING, ha,
+				  "%s: MBOX_CMD_GET_MANAGEMENT_DATA "
+				  "failed w/ status %04X\n", __func__,
+				  mbox_sts[0]));
+	}
+	return status;
+}