[SCSI] target: add initial statistics

This patch adds a target_core_mib.c statistics conversion for
backend context struct se_subsystem_dev + struct se_device config_group
based statistics in target_core_device.c using CONFIGFS_EATTR()
based struct config_item_types from target_core_stat.c code.

The conversion from backend /proc/scsi_target/mib/ context output to configfs
default groups+attributes include scsi_dev, scsi_lu, and scsi_tgt_dev output
from within individual:

	/sys/kernel/config/target/core/$HBA/DEV/

The legacy procfs output now appear as individual configfs attributes under:

*) $HBA/$DEV/statistics/scsi_dev:

|-- indx
|-- inst
|-- ports
`-- role

*) $HBA/$DEV/statistics/scsi_lu:

|-- creation_time
|-- dev
|-- dev_type
|-- full_stat
|-- hs_num_cmds
|-- indx
|-- inst
|-- lu_name
|-- lun
|-- num_cmds
|-- prod
|-- read_mbytes
|-- resets
|-- rev
|-- state_bit
|-- status
|-- vend
`-- write_mbytes

*) $HBA/$DEV/statistics/scsi_tgt_dev:

|-- indx
|-- inst
|-- non_access_lus
|-- num_lus
|-- resets
`-- status

The conversion from backend /proc/scsi_target/mib/ context output to configfs
default groups+attributes include scsi_port, scsi_tgt_port and scsi_transport
output from within individual:

	/sys/kernel/config/target/fabric/$WWN/tpgt_$TPGT/lun/lun_$LUN_ID/statistics/

The legacy procfs output now appear as individual configfs attributes under:

*) fabric/$WWN/tpgt_$TPGT/lun/lun_$LUN_ID/statistics/scsi_port

|-- busy_count
|-- dev
|-- indx
|-- inst
`-- role

*) fabric/$WWN/tpgt_$TPGT/lun/lun_$LUN_ID/statistics/scsi_tgt_port

|-- dev
|-- hs_in_cmds
|-- in_cmds
|-- indx
|-- inst
|-- name
|-- port_index
|-- read_mbytes
`-- write_mbytes

*) fabric/$WWN/tpgt_$TPGT/lun/lun_$LUN_ID/statistics/scsi_transport

|-- dev_name
|-- device
|-- indx
`-- inst

The conversion from backend /proc/scsi_target/mib/ context output to configfs
default groups+attributes include scsi_att_intr_port and scsi_auth_intr output
from within individual:

	/sys/kernel/config/target/fabric/$WWN/tpgt_$TPGT/acls/$INITIATOR_WWN/lun_$LUN_ID/statistics/

The legacy procfs output now appear as individual configfs attributes under:

*) acls/$INITIATOR_WWN/lun_$LUN_ID/statistics/scsi_att_intr_port

|-- dev
|-- indx
|-- inst
|-- port
|-- port_auth_indx
`-- port_ident

*) acls/$INITIATOR_WWN/lun_$LUN_ID/statistics/scsi_auth_intr

|-- att_count
|-- creation_time
|-- dev
|-- dev_or_port
|-- hs_num_cmds
|-- indx
|-- inst
|-- intr_name
|-- map_indx
|-- num_cmds
|-- port
|-- read_mbytes
|-- row_status
`-- write_mbytes

Also, this includes adding struct target_fabric_configfs_template->
tfc_wwn_fabric_stats_cit and ->tfc_tpg_nacl_stat_cit respectively for
use during target_core_fabric_configfs.c:target_fabric_setup_cits()

Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

2 files changed, 37 insertions, 2 deletions

diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
index 79f2e0a30dc8..c15ed5026fb5 100644
--- a/include/target/target_core_base.h
+++ b/include/target/target_core_base.h
@@ -601,7 +601,8 @@ struct se_node_acl {
         struct config_group     acl_attrib_group;
         struct config_group     acl_auth_group;
         struct config_group     acl_param_group;
-        struct config_group     *acl_default_groups[4];
+        struct config_group     acl_fabric_stat_group;
+        struct config_group     *acl_default_groups[5];
         struct list_head        acl_list;
         struct list_head        acl_sess_list;
 } ____cacheline_aligned;
@@ -622,6 +623,12 @@ struct se_device;
 struct se_transform_info;
 struct scatterlist;
 
+struct se_ml_stat_grps {
+        struct config_group     stat_group;
+        struct config_group     scsi_auth_intr_group;
+        struct config_group     scsi_att_intr_port_group;
+};
+
 struct se_lun_acl {
         char                    initiatorname[TRANSPORT_IQN_LEN];
         u32                     mapped_lun;
@@ -629,8 +636,11 @@ struct se_lun_acl {
         struct se_lun           *se_lun;
         struct list_head        lacl_list;
         struct config_group     se_lun_group;
+        struct se_ml_stat_grps  ml_stat_grps;
 }  ____cacheline_aligned;
 
+#define ML_STAT_GRPS(lacl)      (&(lacl)->ml_stat_grps)
+
 struct se_dev_entry {
         bool                    def_pr_registered;
         /* See transport_lunflags_table */
@@ -693,6 +703,13 @@ struct se_dev_attrib {
         struct config_group da_group;
 } ____cacheline_aligned;
 
+struct se_dev_stat_grps {
+        struct config_group stat_group;
+        struct config_group scsi_dev_group;
+        struct config_group scsi_tgt_dev_group;
+        struct config_group scsi_lu_group;
+};
+
 struct se_subsystem_dev {
 /* Used for struct se_subsystem_dev-->se_dev_alias, must be less than PAGE_SIZE */
 #define SE_DEV_ALIAS_LEN                512
@@ -716,11 +733,14 @@ struct se_subsystem_dev {
         struct config_group se_dev_group;
         /* For T10 Reservations */
         struct config_group se_dev_pr_group;
+        /* For target_core_stat.c groups */
+        struct se_dev_stat_grps dev_stat_grps;
 } ____cacheline_aligned;
 
 #define T10_ALUA(su_dev)        (&(su_dev)->t10_alua)
 #define T10_RES(su_dev)         (&(su_dev)->t10_reservation)
 #define T10_PR_OPS(su_dev)      (&(su_dev)->t10_reservation.pr_ops)
+#define DEV_STAT_GRP(dev)       (&(dev)->dev_stat_grps)
 
 struct se_device {
         /* Set to 1 if thread is NOT sleeping on thread_sem */
@@ -834,6 +854,13 @@ struct se_hba {
 
 #define SE_HBA(dev)             ((dev)->se_hba)
 
+struct se_port_stat_grps {
+        struct config_group stat_group;
+        struct config_group scsi_port_group;
+        struct config_group scsi_tgt_port_group;
+        struct config_group scsi_transport_group;
+};
+
 struct se_lun {
         /* See transport_lun_status_table */
         enum transport_lun_status_table lun_status;
@@ -848,11 +875,13 @@ struct se_lun {
         struct list_head        lun_cmd_list;
         struct list_head        lun_acl_list;
         struct se_device        *lun_se_dev;
+        struct se_port          *lun_sep;
         struct config_group     lun_group;
-        struct se_port  *lun_sep;
+        struct se_port_stat_grps port_stat_grps;
 } ____cacheline_aligned;
 
 #define SE_LUN(cmd)             ((cmd)->se_lun)
+#define PORT_STAT_GRP(lun)      (&(lun)->port_stat_grps)
 
 struct scsi_port_stats {
        u64     cmd_pdus;
@@ -924,6 +953,8 @@ struct se_portal_group {
 struct se_wwn {
         struct target_fabric_configfs *wwn_tf;
         struct config_group     wwn_group;
+        struct config_group     *wwn_default_groups[2];
+        struct config_group     fabric_stat_group;
 } ____cacheline_aligned;
 
 struct se_global {
diff --git a/include/target/target_core_configfs.h b/include/target/target_core_configfs.h
index 40e6e740527c..612509592ffd 100644
--- a/include/target/target_core_configfs.h
+++ b/include/target/target_core_configfs.h
@@ -14,10 +14,12 @@ extern void target_fabric_configfs_deregister(struct target_fabric_configfs *);
 struct target_fabric_configfs_template {
         struct config_item_type tfc_discovery_cit;
         struct config_item_type tfc_wwn_cit;
+        struct config_item_type tfc_wwn_fabric_stats_cit;
         struct config_item_type tfc_tpg_cit;
         struct config_item_type tfc_tpg_base_cit;
         struct config_item_type tfc_tpg_lun_cit;
         struct config_item_type tfc_tpg_port_cit;
+        struct config_item_type tfc_tpg_port_stat_cit;
         struct config_item_type tfc_tpg_np_cit;
         struct config_item_type tfc_tpg_np_base_cit;
         struct config_item_type tfc_tpg_attrib_cit;
@@ -27,7 +29,9 @@ struct target_fabric_configfs_template {
         struct config_item_type tfc_tpg_nacl_attrib_cit;
         struct config_item_type tfc_tpg_nacl_auth_cit;
         struct config_item_type tfc_tpg_nacl_param_cit;
+        struct config_item_type tfc_tpg_nacl_stat_cit;
         struct config_item_type tfc_tpg_mappedlun_cit;
+        struct config_item_type tfc_tpg_mappedlun_stat_cit;
 };
 
 struct target_fabric_configfs {