[SCSI] iscsi cls: sysfs group is_visible callout for conn attrs

The iscsi class currently does not support writable sysfs
attrs for LLD sysfs settings. This patch converts the
iscsi class and drivers to use the attribute container
sysfs group and the sysfs group's is_visible callout
to be able to support readable or writable sysfs attrs.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

drivers/infiniband/ulp/iser/iscsi_iser.c

@@ -632,6 +632,31 @@ iscsi_iser_ep_disconnect(struct iscsi_endpoint *ep)
 	iser_conn_terminate(ib_conn);
 }
 
+static mode_t iser_attr_is_visible(int param_type, int param)
+{
+	switch (param_type) {
+	case ISCSI_PARAM:
+		switch (param) {
+		case ISCSI_PARAM_MAX_RECV_DLENGTH:
+		case ISCSI_PARAM_MAX_XMIT_DLENGTH:
+		case ISCSI_PARAM_HDRDGST_EN:
+		case ISCSI_PARAM_DATADGST_EN:
+		case ISCSI_PARAM_CONN_ADDRESS:
+		case ISCSI_PARAM_CONN_PORT:
+		case ISCSI_PARAM_EXP_STATSN:
+		case ISCSI_PARAM_PERSISTENT_ADDRESS:
+		case ISCSI_PARAM_PERSISTENT_PORT:
+		case ISCSI_PARAM_PING_TMO:
+		case ISCSI_PARAM_RECV_TMO:
+			return S_IRUGO;
+		default:
+			return 0;
+		}
+	}
+
+	return 0;
+}
+
 static struct scsi_host_template iscsi_iser_sht = {
 	.module                 = THIS_MODULE,
 	.name                   = "iSCSI Initiator over iSER, v." DRV_VER,
@@ -653,28 +678,18 @@ static struct iscsi_transport iscsi_iser_transport = {
 	.owner                  = THIS_MODULE,
 	.name                   = "iser",
 	.caps                   = CAP_RECOVERY_L0 | CAP_MULTI_R2T,
-	.param_mask		= ISCSI_MAX_RECV_DLENGTH |
-				  ISCSI_MAX_XMIT_DLENGTH |
-				  ISCSI_HDRDGST_EN |
-				  ISCSI_DATADGST_EN |
-				  ISCSI_INITIAL_R2T_EN |
+	.param_mask		= ISCSI_INITIAL_R2T_EN |
 				  ISCSI_MAX_R2T |
 				  ISCSI_IMM_DATA_EN |
 				  ISCSI_FIRST_BURST |
 				  ISCSI_MAX_BURST |
 				  ISCSI_PDU_INORDER_EN |
 				  ISCSI_DATASEQ_INORDER_EN |
-				  ISCSI_CONN_PORT |
-				  ISCSI_CONN_ADDRESS |
-				  ISCSI_EXP_STATSN |
-				  ISCSI_PERSISTENT_PORT |
-				  ISCSI_PERSISTENT_ADDRESS |
 				  ISCSI_TARGET_NAME | ISCSI_TPGT |
 				  ISCSI_USERNAME | ISCSI_PASSWORD |
 				  ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
 				  ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
 				  ISCSI_LU_RESET_TMO | ISCSI_TGT_RESET_TMO |
-				  ISCSI_PING_TMO | ISCSI_RECV_TMO |
 				  ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
 	.host_param_mask	= ISCSI_HOST_HWADDRESS |
 				  ISCSI_HOST_NETDEV_NAME |
@@ -686,6 +701,7 @@ static struct iscsi_transport iscsi_iser_transport = {
 	.create_conn            = iscsi_iser_conn_create,
 	.bind_conn              = iscsi_iser_conn_bind,
 	.destroy_conn           = iscsi_iser_conn_destroy,
+	.attr_is_visible	= iser_attr_is_visible,
 	.set_param              = iscsi_iser_set_param,
 	.get_conn_param		= iscsi_conn_get_param,
 	.get_ep_param		= iscsi_iser_get_ep_param,

drivers/scsi/be2iscsi/be_iscsi.c

@@ -733,3 +733,28 @@ void beiscsi_ep_disconnect(struct iscsi_endpoint *ep)
 	beiscsi_unbind_conn_to_cid(phba, beiscsi_ep->ep_cid);
 	iscsi_destroy_endpoint(beiscsi_ep->openiscsi_ep);
 }
+
+mode_t be2iscsi_attr_is_visible(int param_type, int param)
+{
+	switch (param_type) {
+	case ISCSI_PARAM:
+		switch (param) {
+		case ISCSI_PARAM_MAX_RECV_DLENGTH:
+		case ISCSI_PARAM_MAX_XMIT_DLENGTH:
+		case ISCSI_PARAM_HDRDGST_EN:
+		case ISCSI_PARAM_DATADGST_EN:
+		case ISCSI_PARAM_CONN_ADDRESS:
+		case ISCSI_PARAM_CONN_PORT:
+		case ISCSI_PARAM_EXP_STATSN:
+		case ISCSI_PARAM_PERSISTENT_ADDRESS:
+		case ISCSI_PARAM_PERSISTENT_PORT:
+		case ISCSI_PARAM_PING_TMO:
+		case ISCSI_PARAM_RECV_TMO:
+			return S_IRUGO;
+		default:
+			return 0;
+		}
+	}
+
+	return 0;
+}

drivers/scsi/be2iscsi/be_iscsi.h

@@ -26,6 +26,8 @@
 #define BE2_IPV4  0x1
 #define BE2_IPV6  0x10
 
+mode_t be2iscsi_attr_is_visible(int param_type, int param);
+
 void beiscsi_offload_connection(struct beiscsi_conn *beiscsi_conn,
 				struct beiscsi_offload_params *params);
 

drivers/scsi/be2iscsi/be_main.c

@@ -4364,10 +4364,7 @@ struct iscsi_transport beiscsi_iscsi_transport = {
 	.name = DRV_NAME,
 	.caps = CAP_RECOVERY_L0 | CAP_HDRDGST | CAP_TEXT_NEGO |
 		CAP_MULTI_R2T | CAP_DATADGST | CAP_DATA_PATH_OFFLOAD,
-	.param_mask = ISCSI_MAX_RECV_DLENGTH |
-		ISCSI_MAX_XMIT_DLENGTH |
-		ISCSI_HDRDGST_EN |
-		ISCSI_DATADGST_EN |
+	.param_mask =
 		ISCSI_INITIAL_R2T_EN |
 		ISCSI_MAX_R2T |
 		ISCSI_IMM_DATA_EN |
@@ -4376,17 +4373,11 @@ struct iscsi_transport beiscsi_iscsi_transport = {
 		ISCSI_PDU_INORDER_EN |
 		ISCSI_DATASEQ_INORDER_EN |
 		ISCSI_ERL |
-		ISCSI_CONN_PORT |
-		ISCSI_CONN_ADDRESS |
-		ISCSI_EXP_STATSN |
-		ISCSI_PERSISTENT_PORT |
-		ISCSI_PERSISTENT_ADDRESS |
 		ISCSI_TARGET_NAME | ISCSI_TPGT |
 		ISCSI_USERNAME | ISCSI_PASSWORD |
 		ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
 		ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
 		ISCSI_LU_RESET_TMO |
-		ISCSI_PING_TMO | ISCSI_RECV_TMO |
 		ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
 	.host_param_mask = ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
 				ISCSI_HOST_INITIATOR_NAME,
@@ -4395,6 +4386,7 @@ struct iscsi_transport beiscsi_iscsi_transport = {
 	.create_conn = beiscsi_conn_create,
 	.bind_conn = beiscsi_conn_bind,
 	.destroy_conn = iscsi_conn_teardown,
+	.attr_is_visible = be2iscsi_attr_is_visible,
 	.set_param = beiscsi_set_param,
 	.get_conn_param = iscsi_conn_get_param,
 	.get_session_param = iscsi_session_get_param,

drivers/scsi/bnx2i/bnx2i_iscsi.c

@@ -2177,6 +2177,30 @@ static int bnx2i_nl_set_path(struct Scsi_Host *shost, struct iscsi_path *params)
 	return 0;
 }
 
+static mode_t bnx2i_attr_is_visible(int param_type, int param)
+{
+	switch (param_type) {
+	case ISCSI_PARAM:
+		switch (param) {
+		case ISCSI_PARAM_MAX_RECV_DLENGTH:
+		case ISCSI_PARAM_MAX_XMIT_DLENGTH:
+		case ISCSI_PARAM_HDRDGST_EN:
+		case ISCSI_PARAM_DATADGST_EN:
+		case ISCSI_PARAM_CONN_ADDRESS:
+		case ISCSI_PARAM_CONN_PORT:
+		case ISCSI_PARAM_EXP_STATSN:
+		case ISCSI_PARAM_PERSISTENT_ADDRESS:
+		case ISCSI_PARAM_PERSISTENT_PORT:
+		case ISCSI_PARAM_PING_TMO:
+		case ISCSI_PARAM_RECV_TMO:
+			return S_IRUGO;
+		default:
+			return 0;
+		}
+	}
+
+	return 0;
+}
 
 /*
  * 'Scsi_Host_Template' structure and 'iscsi_tranport' structure template
@@ -2207,11 +2231,7 @@ struct iscsi_transport bnx2i_iscsi_transport = {
 				  CAP_MULTI_R2T | CAP_DATADGST |
 				  CAP_DATA_PATH_OFFLOAD |
 				  CAP_TEXT_NEGO,
-	.param_mask		= ISCSI_MAX_RECV_DLENGTH |
-				  ISCSI_MAX_XMIT_DLENGTH |
-				  ISCSI_HDRDGST_EN |
-				  ISCSI_DATADGST_EN |
-				  ISCSI_INITIAL_R2T_EN |
+	.param_mask		= ISCSI_INITIAL_R2T_EN |
 				  ISCSI_MAX_R2T |
 				  ISCSI_IMM_DATA_EN |
 				  ISCSI_FIRST_BURST |
@@ -2219,17 +2239,11 @@ struct iscsi_transport bnx2i_iscsi_transport = {
 				  ISCSI_PDU_INORDER_EN |
 				  ISCSI_DATASEQ_INORDER_EN |
 				  ISCSI_ERL |
-				  ISCSI_CONN_PORT |
-				  ISCSI_CONN_ADDRESS |
-				  ISCSI_EXP_STATSN |
-				  ISCSI_PERSISTENT_PORT |
-				  ISCSI_PERSISTENT_ADDRESS |
 				  ISCSI_TARGET_NAME | ISCSI_TPGT |
 				  ISCSI_USERNAME | ISCSI_PASSWORD |
 				  ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
 				  ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
 				  ISCSI_LU_RESET_TMO | ISCSI_TGT_RESET_TMO |
-				  ISCSI_PING_TMO | ISCSI_RECV_TMO |
 				  ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
 	.host_param_mask	= ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
 				  ISCSI_HOST_NETDEV_NAME,
@@ -2238,6 +2252,7 @@ struct iscsi_transport bnx2i_iscsi_transport = {
 	.create_conn		= bnx2i_conn_create,
 	.bind_conn		= bnx2i_conn_bind,
 	.destroy_conn		= bnx2i_conn_destroy,
+	.attr_is_visible	= bnx2i_attr_is_visible,
 	.set_param		= iscsi_set_param,
 	.get_conn_param		= iscsi_conn_get_param,
 	.get_session_param	= iscsi_session_get_param,

drivers/scsi/cxgbi/cxgb3i/cxgb3i.c

@@ -106,25 +106,21 @@ static struct iscsi_transport cxgb3i_iscsi_transport = {
 	.caps		= CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
 				| CAP_DATADGST | CAP_DIGEST_OFFLOAD |
 				CAP_PADDING_OFFLOAD | CAP_TEXT_NEGO,
-	.param_mask	= ISCSI_MAX_RECV_DLENGTH | ISCSI_MAX_XMIT_DLENGTH |
-				ISCSI_HDRDGST_EN | ISCSI_DATADGST_EN |
+	.param_mask	=
 				ISCSI_INITIAL_R2T_EN | ISCSI_MAX_R2T |
 				ISCSI_IMM_DATA_EN | ISCSI_FIRST_BURST |
 				ISCSI_MAX_BURST | ISCSI_PDU_INORDER_EN |
 				ISCSI_DATASEQ_INORDER_EN | ISCSI_ERL |
-				ISCSI_CONN_PORT | ISCSI_CONN_ADDRESS |
-				ISCSI_EXP_STATSN | ISCSI_PERSISTENT_PORT |
-				ISCSI_PERSISTENT_ADDRESS |
 				ISCSI_TARGET_NAME | ISCSI_TPGT |
 				ISCSI_USERNAME | ISCSI_PASSWORD |
 				ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
 				ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
 				ISCSI_LU_RESET_TMO | ISCSI_TGT_RESET_TMO |
-				ISCSI_PING_TMO | ISCSI_RECV_TMO |
 				ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
 	.host_param_mask	= ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
 				ISCSI_HOST_INITIATOR_NAME |
 				ISCSI_HOST_NETDEV_NAME,
+	.attr_is_visible	= cxgbi_attr_is_visible,
 	.get_host_param	= cxgbi_get_host_param,
 	.set_host_param	= cxgbi_set_host_param,
 	/* session management */

drivers/scsi/cxgbi/cxgb4i/cxgb4i.c

@@ -107,25 +107,21 @@ static struct iscsi_transport cxgb4i_iscsi_transport = {
 	.caps		= CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST |
 				CAP_DATADGST | CAP_DIGEST_OFFLOAD |
 				CAP_PADDING_OFFLOAD | CAP_TEXT_NEGO,
-	.param_mask	= ISCSI_MAX_RECV_DLENGTH | ISCSI_MAX_XMIT_DLENGTH |
-				ISCSI_HDRDGST_EN | ISCSI_DATADGST_EN |
+	.param_mask	=
 				ISCSI_INITIAL_R2T_EN | ISCSI_MAX_R2T |
 				ISCSI_IMM_DATA_EN | ISCSI_FIRST_BURST |
 				ISCSI_MAX_BURST | ISCSI_PDU_INORDER_EN |
 				ISCSI_DATASEQ_INORDER_EN | ISCSI_ERL |
-				ISCSI_CONN_PORT | ISCSI_CONN_ADDRESS |
-				ISCSI_EXP_STATSN | ISCSI_PERSISTENT_PORT |
-				ISCSI_PERSISTENT_ADDRESS |
 				ISCSI_TARGET_NAME | ISCSI_TPGT |
 				ISCSI_USERNAME | ISCSI_PASSWORD |
 				ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
 				ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
 				ISCSI_LU_RESET_TMO | ISCSI_TGT_RESET_TMO |
-				ISCSI_PING_TMO | ISCSI_RECV_TMO |
 				ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
 	.host_param_mask	= ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
 				ISCSI_HOST_INITIATOR_NAME |
 				ISCSI_HOST_NETDEV_NAME,
+	.attr_is_visible	= cxgbi_attr_is_visible,
 	.get_host_param	= cxgbi_get_host_param,
 	.set_host_param	= cxgbi_set_host_param,
 	/* session management */

drivers/scsi/cxgbi/libcxgbi.c

@@ -2566,6 +2566,32 @@ void cxgbi_iscsi_cleanup(struct iscsi_transport *itp,
 }
 EXPORT_SYMBOL_GPL(cxgbi_iscsi_cleanup);
 
+mode_t cxgbi_attr_is_visible(int param_type, int param)
+{
+	switch (param_type) {
+	case ISCSI_PARAM:
+		switch (param) {
+		case ISCSI_PARAM_MAX_RECV_DLENGTH:
+		case ISCSI_PARAM_MAX_XMIT_DLENGTH:
+		case ISCSI_PARAM_HDRDGST_EN:
+		case ISCSI_PARAM_DATADGST_EN:
+		case ISCSI_PARAM_CONN_ADDRESS:
+		case ISCSI_PARAM_CONN_PORT:
+		case ISCSI_PARAM_EXP_STATSN:
+		case ISCSI_PARAM_PERSISTENT_ADDRESS:
+		case ISCSI_PARAM_PERSISTENT_PORT:
+		case ISCSI_PARAM_PING_TMO:
+		case ISCSI_PARAM_RECV_TMO:
+			return S_IRUGO;
+		default:
+			return 0;
+		}
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(cxgbi_attr_is_visible);
+
 static int __init libcxgbi_init_module(void)
 {
 	sw_tag_idx_bits = (__ilog2_u32(ISCSI_ITT_MASK)) + 1;

drivers/scsi/cxgbi/libcxgbi.h

@@ -709,6 +709,7 @@ int cxgbi_conn_xmit_pdu(struct iscsi_task *);
 
 void cxgbi_cleanup_task(struct iscsi_task *task);
 
+mode_t cxgbi_attr_is_visible(int param_type, int param);
 void cxgbi_get_conn_stats(struct iscsi_cls_conn *, struct iscsi_stats *);
 int cxgbi_set_conn_param(struct iscsi_cls_conn *,
 			enum iscsi_param, char *, int);

drivers/scsi/iscsi_tcp.c

@@ -872,6 +872,31 @@ static void iscsi_sw_tcp_session_destroy(struct iscsi_cls_session *cls_session)
 	iscsi_host_free(shost);
 }
 
+static mode_t iscsi_sw_tcp_attr_is_visible(int param_type, int param)
+{
+	switch (param_type) {
+	case ISCSI_PARAM:
+		switch (param) {
+		case ISCSI_PARAM_MAX_RECV_DLENGTH:
+		case ISCSI_PARAM_MAX_XMIT_DLENGTH:
+		case ISCSI_PARAM_HDRDGST_EN:
+		case ISCSI_PARAM_DATADGST_EN:
+		case ISCSI_PARAM_CONN_ADDRESS:
+		case ISCSI_PARAM_CONN_PORT:
+		case ISCSI_PARAM_EXP_STATSN:
+		case ISCSI_PARAM_PERSISTENT_ADDRESS:
+		case ISCSI_PARAM_PERSISTENT_PORT:
+		case ISCSI_PARAM_PING_TMO:
+		case ISCSI_PARAM_RECV_TMO:
+			return S_IRUGO;
+		default:
+			return 0;
+		}
+	}
+
+	return 0;
+}
+
 static int iscsi_sw_tcp_slave_alloc(struct scsi_device *sdev)
 {
 	set_bit(QUEUE_FLAG_BIDI, &sdev->request_queue->queue_flags);
@@ -910,11 +935,7 @@ static struct iscsi_transport iscsi_sw_tcp_transport = {
 	.name			= "tcp",
 	.caps			= CAP_RECOVERY_L0 | CAP_MULTI_R2T | CAP_HDRDGST
 				  | CAP_DATADGST,
-	.param_mask		= ISCSI_MAX_RECV_DLENGTH |
-				  ISCSI_MAX_XMIT_DLENGTH |
-				  ISCSI_HDRDGST_EN |
-				  ISCSI_DATADGST_EN |
-				  ISCSI_INITIAL_R2T_EN |
+	.param_mask		= ISCSI_INITIAL_R2T_EN |
 				  ISCSI_MAX_R2T |
 				  ISCSI_IMM_DATA_EN |
 				  ISCSI_FIRST_BURST |
@@ -922,17 +943,11 @@ static struct iscsi_transport iscsi_sw_tcp_transport = {
 				  ISCSI_PDU_INORDER_EN |
 				  ISCSI_DATASEQ_INORDER_EN |
 				  ISCSI_ERL |
-				  ISCSI_CONN_PORT |
-				  ISCSI_CONN_ADDRESS |
-				  ISCSI_EXP_STATSN |
-				  ISCSI_PERSISTENT_PORT |
-				  ISCSI_PERSISTENT_ADDRESS |
 				  ISCSI_TARGET_NAME | ISCSI_TPGT |
 				  ISCSI_USERNAME | ISCSI_PASSWORD |
 				  ISCSI_USERNAME_IN | ISCSI_PASSWORD_IN |
 				  ISCSI_FAST_ABORT | ISCSI_ABORT_TMO |
 				  ISCSI_LU_RESET_TMO | ISCSI_TGT_RESET_TMO |
-				  ISCSI_PING_TMO | ISCSI_RECV_TMO |
 				  ISCSI_IFACE_NAME | ISCSI_INITIATOR_NAME,
 	.host_param_mask	= ISCSI_HOST_HWADDRESS | ISCSI_HOST_IPADDRESS |
 				  ISCSI_HOST_INITIATOR_NAME |
@@ -944,6 +959,7 @@ static struct iscsi_transport iscsi_sw_tcp_transport = {
 	.create_conn		= iscsi_sw_tcp_conn_create,
 	.bind_conn		= iscsi_sw_tcp_conn_bind,
 	.destroy_conn		= iscsi_sw_tcp_conn_destroy,
+	.attr_is_visible	= iscsi_sw_tcp_attr_is_visible,
 	.set_param		= iscsi_sw_tcp_conn_set_param,
 	.get_conn_param		= iscsi_sw_tcp_conn_get_param,
 	.get_session_param	= iscsi_session_get_param,

drivers/scsi/qla4xxx/ql4_os.c

@@ -100,6 +100,7 @@ static int qla4xxx_slave_alloc(struct scsi_device *device);
 static int qla4xxx_slave_configure(struct scsi_device *device);
 static void qla4xxx_slave_destroy(struct scsi_device *sdev);
 static void qla4xxx_scan_start(struct Scsi_Host *shost);
+static mode_t ql4_attr_is_visible(int param_type, int param);
 
 static struct qla4_8xxx_legacy_intr_set legacy_intr[] =
     QLA82XX_LEGACY_INTR_CONFIG;
@@ -137,8 +138,7 @@ static struct iscsi_transport qla4xxx_iscsi_transport = {
 	.name			= DRIVER_NAME,
 	.caps			= CAP_FW_DB | CAP_SENDTARGETS_OFFLOAD |
 				  CAP_DATA_PATH_OFFLOAD,
-	.param_mask		= ISCSI_CONN_PORT | ISCSI_CONN_ADDRESS |
-				  ISCSI_TARGET_NAME | ISCSI_TPGT |
+	.param_mask		= ISCSI_TARGET_NAME | ISCSI_TPGT |
 				  ISCSI_TARGET_ALIAS,
 	.host_param_mask	= ISCSI_HOST_HWADDRESS |
 				  ISCSI_HOST_IPADDRESS |
@@ -155,6 +155,7 @@ static struct iscsi_transport qla4xxx_iscsi_transport = {
 				  ISCSI_NET_IPV6_LINKLOCAL_AUTOCFG |
 				  ISCSI_NET_IFACE_ENABLE,
 	.tgt_dscvr		= qla4xxx_tgt_dscvr,
+	.attr_is_visible	= ql4_attr_is_visible,
 	.get_conn_param		= qla4xxx_conn_get_param,
 	.get_session_param	= qla4xxx_sess_get_param,
 	.get_host_param		= qla4xxx_host_get_param,
@@ -165,6 +166,22 @@ static struct iscsi_transport qla4xxx_iscsi_transport = {
 
 static struct scsi_transport_template *qla4xxx_scsi_transport;
 
+static mode_t ql4_attr_is_visible(int param_type, int param)
+{
+	switch (param_type) {
+	case ISCSI_PARAM:
+		switch (param) {
+		case ISCSI_PARAM_CONN_ADDRESS:
+		case ISCSI_PARAM_CONN_PORT:
+			return S_IRUGO;
+		default:
+			return 0;
+		}
+	}
+
+	return 0;
+}
+
 static int qla4xxx_get_iface_param(struct iscsi_iface *iface,
 				   enum iscsi_param_type param_type,
 				   int param, char *buf)

drivers/scsi/scsi_transport_iscsi.c

@@ -78,7 +78,6 @@ struct iscsi_internal {
 
 	struct device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1];
 	struct transport_container conn_cont;
-	struct device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1];
 	struct transport_container session_cont;
 	struct device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1];
 };
@@ -2030,6 +2029,70 @@ static ISCSI_CLASS_ATTR(conn, field, S_IRUGO,				\
 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
 
+static struct attribute *iscsi_conn_attrs[] = {
+	&dev_attr_conn_max_recv_dlength.attr,
+	&dev_attr_conn_max_xmit_dlength.attr,
+	&dev_attr_conn_header_digest.attr,
+	&dev_attr_conn_data_digest.attr,
+	&dev_attr_conn_ifmarker.attr,
+	&dev_attr_conn_ofmarker.attr,
+	&dev_attr_conn_address.attr,
+	&dev_attr_conn_port.attr,
+	&dev_attr_conn_exp_statsn.attr,
+	&dev_attr_conn_persistent_address.attr,
+	&dev_attr_conn_persistent_port.attr,
+	&dev_attr_conn_ping_tmo.attr,
+	&dev_attr_conn_recv_tmo.attr,
+	NULL,
+};
+
+static mode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
+					 struct attribute *attr, int i)
+{
+	struct device *cdev = container_of(kobj, struct device, kobj);
+	struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
+	struct iscsi_transport *t = conn->transport;
+	int param;
+
+	if (attr == &dev_attr_conn_max_recv_dlength.attr)
+		param = ISCSI_PARAM_MAX_RECV_DLENGTH;
+	else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
+		param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
+	else if (attr == &dev_attr_conn_header_digest.attr)
+		param = ISCSI_PARAM_HDRDGST_EN;
+	else if (attr == &dev_attr_conn_data_digest.attr)
+		param = ISCSI_PARAM_DATADGST_EN;
+	else if (attr == &dev_attr_conn_ifmarker.attr)
+		param = ISCSI_PARAM_IFMARKER_EN;
+	else if (attr == &dev_attr_conn_ofmarker.attr)
+		param = ISCSI_PARAM_OFMARKER_EN;
+	else if (attr == &dev_attr_conn_address.attr)
+		param = ISCSI_PARAM_CONN_ADDRESS;
+	else if (attr == &dev_attr_conn_port.attr)
+		param = ISCSI_PARAM_CONN_PORT;
+	else if (attr == &dev_attr_conn_exp_statsn.attr)
+		param = ISCSI_PARAM_EXP_STATSN;
+	else if (attr == &dev_attr_conn_persistent_address.attr)
+		param = ISCSI_PARAM_PERSISTENT_ADDRESS;
+	else if (attr == &dev_attr_conn_persistent_port.attr)
+		param = ISCSI_PARAM_PERSISTENT_PORT;
+	else if (attr == &dev_attr_conn_ping_tmo.attr)
+		param = ISCSI_PARAM_PING_TMO;
+	else if (attr == &dev_attr_conn_recv_tmo.attr)
+		param = ISCSI_PARAM_RECV_TMO;
+	else {
+		WARN_ONCE(1, "Invalid conn attr");
+		return 0;
+	}
+
+	return t->attr_is_visible(ISCSI_PARAM, param);
+}
+
+static struct attribute_group iscsi_conn_group = {
+	.attrs = iscsi_conn_attrs,
+	.is_visible = iscsi_conn_attr_is_visible,
+};
+
 /*
  * iSCSI session attrs
  */
@@ -2171,14 +2234,6 @@ do {									\
 	}								\
 } while (0)
 
-#define SETUP_CONN_RD_ATTR(field, param_flag)				\
-do {									\
-	if (tt->param_mask & param_flag) {				\
-		priv->conn_attrs[count] = &dev_attr_conn_##field; \
-		count++;						\
-	}								\
-} while (0)
-
 #define SETUP_HOST_RD_ATTR(field, param_flag)				\
 do {									\
 	if (tt->host_param_mask & param_flag) {				\
@@ -2299,29 +2354,11 @@ iscsi_register_transport(struct iscsi_transport *tt)
 	count = 0;
 
 	/* connection parameters */
-	priv->conn_cont.ac.attrs = &priv->conn_attrs[0];
 	priv->conn_cont.ac.class = &iscsi_connection_class.class;
 	priv->conn_cont.ac.match = iscsi_conn_match;
+	priv->conn_cont.ac.grp = &iscsi_conn_group;
 	transport_container_register(&priv->conn_cont);
 
-	SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH);
-	SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH);
-	SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN);
-	SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN);
-	SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN);
-	SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN);
-	SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS);
-	SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT);
-	SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN);
-	SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS);
-	SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT);
-	SETUP_CONN_RD_ATTR(ping_tmo, ISCSI_PING_TMO);
-	SETUP_CONN_RD_ATTR(recv_tmo, ISCSI_RECV_TMO);
-
-	BUG_ON(count > ISCSI_CONN_ATTRS);
-	priv->conn_attrs[count] = NULL;
-	count = 0;
-
 	/* session parameters */
 	priv->session_cont.ac.attrs = &priv->session_attrs[0];
 	priv->session_cont.ac.class = &iscsi_session_class.class;

include/scsi/scsi_transport_iscsi.h

@@ -144,8 +144,10 @@ struct iscsi_transport {
 	int (*get_iface_param) (struct iscsi_iface *iface,
 				enum iscsi_param_type param_type,
 				int param, char *buf);
+	mode_t (*attr_is_visible)(int param_type, int param);
 };
 
+
 /*
  * transport registration upcalls
  */
@@ -178,6 +180,9 @@ struct iscsi_cls_conn {
 #define iscsi_dev_to_conn(_dev) \
 	container_of(_dev, struct iscsi_cls_conn, dev)
 
+#define transport_class_to_conn(_cdev) \
+	iscsi_dev_to_conn(_cdev->parent)
+
 #define iscsi_conn_to_session(_conn) \
 	iscsi_dev_to_session(_conn->dev.parent)