>From 579003f73d50d905626ef98c5caf349b609b8631 Mon Sep 17 00:00:00 2001
From: Nicholas Bellinger
Date: Thu, 23 Oct 2008 06:04:09 -0700
Subject: [PATCH] [LIO-Target/ConfigFS]: Added Target Portal Group Parameter READ/WRITE access

Added struct config_item_type lio_target_tpg_param_cit that lives under:

/sys/kernel/config/target/iscsi/$IQN/$TPGT/param/

These are the default params for $IQN/$TPGT that are copied over when
a new iSCSI Session/Connection is created when a new Login is received
from an iSCSI Initiator. All parameters are READ/WRITEABLE, and the
values passed are sanity checked.

Here is what is looks like:

| | `-- param
| | |-- AuthMethod
| | |-- DataDigest
| | |-- DataPDUInOrder
| | |-- DataSequenceInOrder
| | |-- DefaultTime2Retain
| | |-- DefaultTime2Wait
| | |-- ErrorRecoveryLevel
| | |-- FirstBurstLength
| | |-- HeaderDigest
| | |-- IFMarkInt
| | |-- IFMarker
| | |-- ImmediateData
| | |-- InitialR2T
| | |-- MaxBurstLength
| | |-- MaxConnections
| | |-- MaxOutstandingR2T
| | |-- MaxRecvDataSegmentLength
| | |-- OFMarkInt
| | |-- OFMarker
| | `-- TargetAlias

Signed-off-by: Nicholas A. Bellinger
---
drivers/lio-core/iscsi_target_configfs.c | 181 +++++++++++++++++++++++++++++-
drivers/lio-core/iscsi_target_core.h | 1 +
2 files changed, 177 insertions(+), 5 deletions(-)

diff --git a/drivers/lio-core/iscsi_target_configfs.c b/drivers/lio-core/iscsi_target_configfs.c
index 7f89a49..016ebad 100644
--- a/drivers/lio-core/iscsi_target_configfs.c
+++ b/drivers/lio-core/iscsi_target_configfs.c
@@ -1375,8 +1375,11 @@ static struct config_group *lio_target_call_addnodetotpg (
if (!(tpg = core_get_tpg_from_iqn(config_item_name(tiqn_ci),
&tiqn, tpgt, 0)))
return(NULL);
-
-#warning FIXME: cmdsn_depth set to ISCSI_TPG_ATTRIB(tpg)->default_cmdsn_depth
+ /*
+ * ISCSI_TPG_ATTRIB(tpg)->default_cmdsn is used for the default.
+ * This can be changed in either with or without an active session.
+ * $FABRIC/$IQN/$TPGT/acl/$INITIATOR_IQN/cmdsn_depth
+ */
cmdsn_depth = ISCSI_TPG_ATTRIB(tpg)->default_cmdsn_depth;

if (!(acl = iscsi_tpg_add_initiator_node_acl(tpg, name,
@@ -1586,6 +1589,7 @@ static struct configfs_attribute *lio_target_tpg_attrib_attrs[] = {
&iscsi_tpg_attrib_default_cmdsn_depth.attr,
&iscsi_tpg_attrib_cache_dynamic_acls.attr,
&iscsi_tpg_attrib_demo_mode_lun_access.attr,
+ NULL,
};

static struct configfs_item_operations lio_target_tpg_attrib_ops = {
@@ -1601,6 +1605,171 @@ static struct config_item_type lio_target_tpg_attrib_cit = {

// End items for lio_target_tpg_attrib_cit

+// Start items for lio_target_tpg_param_cit
+
+#define DEF_TPG_PARAM(name) \
+static ssize_t lio_target_show_tpg_param_##name ( \
+ struct iscsi_portal_group_s *tpg_p, \
+ char *page) \
+{ \
+ iscsi_portal_group_t *tpg; \
+ iscsi_tiqn_t *tiqn; \
+ iscsi_param_t *param; \
+ ssize_t rb; \
+ \
+ if (!(tpg = core_get_tpg_from_iqn(tpg_p->tpg_tiqn->tiqn, \
+ &tiqn, tpg_p->tpgt, 0))) \
+ return(-EINVAL); \
+ \
+ if (!(param = iscsi_find_param_from_key(__stringify(name), \
+ tpg->param_list))) { \
+ iscsi_put_tpg(tpg); \
+ return(-EINVAL); \
+ } \
+ rb = snprintf(page, PAGE_SIZE, "%s\n", param->value); \
+ \
+ iscsi_put_tpg(tpg); \
+ return(rb); \
+} \
+static ssize_t lio_target_store_tpg_param_##name ( \
+ struct iscsi_portal_group_s *tpg_p, \
+ const char *page, \
+ size_t count) \
+{ \
+ iscsi_portal_group_t *tpg; \
+ iscsi_tiqn_t *tiqn; \
+ char *buf; \
+ int ret; \
+ \
+ if (!(buf = kzalloc(PAGE_SIZE, GFP_KERNEL))) \
+ return(-ENOMEM); \
+ snprintf(buf, PAGE_SIZE, "%s=%s", __stringify(name), page); \
+ buf[strlen(buf)-1] = '\0'; /* Kill newline */ \
+ \
+ if (!(tpg = core_get_tpg_from_iqn(tpg_p->tpg_tiqn->tiqn, \
+ &tiqn, tpg_p->tpgt, 0))) { \
+ kfree(buf); \
+ return(-EINVAL); \
+ } \
+ if ((ret = iscsi_change_param_value(buf, SENDER_TARGET, \
+ tpg->param_list, 1)) < 0) \
+ goto out; \
+ \
+ kfree(buf); \
+ iscsi_put_tpg(tpg); \
+ return(count); \
+out: \
+ kfree(buf); \
+ iscsi_put_tpg(tpg); \
+ return(-EINVAL); \
+}
+
+CONFIGFS_EATTR_STRUCT(iscsi_tpg_param, iscsi_portal_group_s);
+#define TPG_PARAM_ATTR(_name, _mode) \
+static struct iscsi_tpg_param_attribute iscsi_tpg_param_##_name = \
+ __CONFIGFS_EATTR(_name, _mode, \
+ lio_target_show_tpg_param_##_name, \
+ lio_target_store_tpg_param_##_name)
+
+DEF_TPG_PARAM(AuthMethod);
+TPG_PARAM_ATTR(AuthMethod, S_IRUGO | S_IWUSR);
+
+DEF_TPG_PARAM(HeaderDigest);
+TPG_PARAM_ATTR(HeaderDigest, S_IRUGO | S_IWUSR);
+
+DEF_TPG_PARAM(DataDigest);
+TPG_PARAM_ATTR(DataDigest, S_IRUGO | S_IWUSR);
+
+DEF_TPG_PARAM(MaxConnections);
+TPG_PARAM_ATTR(MaxConnections, S_IRUGO | S_IWUSR);
+
+DEF_TPG_PARAM(TargetAlias);
+TPG_PARAM_ATTR(TargetAlias, S_IRUGO | S_IWUSR);
+
+DEF_TPG_PARAM(InitialR2T);
+TPG_PARAM_ATTR(InitialR2T, S_IRUGO | S_IWUSR);
+
+DEF_TPG_PARAM(ImmediateData);
+TPG_PARAM_ATTR(ImmediateData, S_IRUGO | S_IWUSR);
+
+DEF_TPG_PARAM(MaxRecvDataSegmentLength);
+TPG_PARAM_ATTR(MaxRecvDataSegmentLength, S_IRUGO | S_IWUSR);
+
+DEF_TPG_PARAM(MaxBurstLength);
+TPG_PARAM_ATTR(MaxBurstLength, S_IRUGO | S_IWUSR);
+
+DEF_TPG_PARAM(FirstBurstLength);
+TPG_PARAM_ATTR(FirstBurstLength, S_IRUGO | S_IWUSR);
+
+DEF_TPG_PARAM(DefaultTime2Wait);
+TPG_PARAM_ATTR(DefaultTime2Wait, S_IRUGO | S_IWUSR);
+
+DEF_TPG_PARAM(DefaultTime2Retain);
+TPG_PARAM_ATTR(DefaultTime2Retain, S_IRUGO | S_IWUSR);
+
+DEF_TPG_PARAM(MaxOutstandingR2T);
+TPG_PARAM_ATTR(MaxOutstandingR2T, S_IRUGO | S_IWUSR);
+
+DEF_TPG_PARAM(DataPDUInOrder);
+TPG_PARAM_ATTR(DataPDUInOrder, S_IRUGO | S_IWUSR);
+
+DEF_TPG_PARAM(DataSequenceInOrder);
+TPG_PARAM_ATTR(DataSequenceInOrder, S_IRUGO | S_IWUSR);
+
+DEF_TPG_PARAM(ErrorRecoveryLevel);
+TPG_PARAM_ATTR(ErrorRecoveryLevel, S_IRUGO | S_IWUSR);
+
+DEF_TPG_PARAM(IFMarker);
+TPG_PARAM_ATTR(IFMarker, S_IRUGO | S_IWUSR);
+
+DEF_TPG_PARAM(OFMarker);
+TPG_PARAM_ATTR(OFMarker, S_IRUGO | S_IWUSR);
+
+DEF_TPG_PARAM(IFMarkInt);
+TPG_PARAM_ATTR(IFMarkInt, S_IRUGO | S_IWUSR);
+
+DEF_TPG_PARAM(OFMarkInt);
+TPG_PARAM_ATTR(OFMarkInt, S_IRUGO | S_IWUSR);
+
+CONFIGFS_EATTR_OPS(iscsi_tpg_param, iscsi_portal_group_s, tpg_param_group);
+
+static struct configfs_attribute *lio_target_tpg_param_attrs[] = {
+ &iscsi_tpg_param_AuthMethod.attr,
+ &iscsi_tpg_param_HeaderDigest.attr,
+ &iscsi_tpg_param_DataDigest.attr,
+ &iscsi_tpg_param_MaxConnections.attr,
+ &iscsi_tpg_param_TargetAlias.attr,
+ &iscsi_tpg_param_InitialR2T.attr,
+ &iscsi_tpg_param_ImmediateData.attr,
+ &iscsi_tpg_param_MaxRecvDataSegmentLength.attr,
+ &iscsi_tpg_param_MaxBurstLength.attr,
+ &iscsi_tpg_param_FirstBurstLength.attr,
+ &iscsi_tpg_param_DefaultTime2Wait.attr,
+ &iscsi_tpg_param_DefaultTime2Retain.attr,
+ &iscsi_tpg_param_MaxOutstandingR2T.attr,
+ &iscsi_tpg_param_DataPDUInOrder.attr,
+ &iscsi_tpg_param_DataSequenceInOrder.attr,
+ &iscsi_tpg_param_ErrorRecoveryLevel.attr,
+ &iscsi_tpg_param_IFMarker.attr,
+ &iscsi_tpg_param_OFMarker.attr,
+ &iscsi_tpg_param_IFMarkInt.attr,
+ &iscsi_tpg_param_OFMarkInt.attr,
+ NULL,
+};
+
+static struct configfs_item_operations lio_target_tpg_param_ops = {
+ .show_attribute = iscsi_tpg_param_attr_show,
+ .store_attribute = iscsi_tpg_param_attr_store,
+};
+
+static struct config_item_type lio_target_tpg_param_cit = {
+ .ct_item_ops = &lio_target_tpg_param_ops,
+ .ct_attrs = lio_target_tpg_param_attrs,
+ .ct_owner = THIS_MODULE,
+};
+
+// End items for lio_target_tpg_param_cit
+
// Start items for lio_target_tpg_cit

static ssize_t lio_target_store_tpg_control (void *p, const char *page, size_t count)
@@ -1770,7 +1939,7 @@ static struct config_group *lio_target_tiqn_addtpg (
/*
* Create default configfs groups for iscsi_portal_group_t..
*/
- if (!(tpg_cg->default_groups = kzalloc(sizeof(struct config_group) * 5,
+ if (!(tpg_cg->default_groups = kzalloc(sizeof(struct config_group) * 6,
GFP_KERNEL)))
goto out;

@@ -1779,12 +1948,14 @@ static struct config_group *lio_target_tiqn_addtpg (
config_group_init_type_name(&tpg->tpg_np_group, "np", &lio_target_np_cit);
config_group_init_type_name(&tpg->tpg_lun_group, "lun", &lio_target_lun_cit);
config_group_init_type_name(&tpg->tpg_acl_group, "acls", &lio_target_acl_cit);
+ config_group_init_type_name(&tpg->tpg_param_group, "param", &lio_target_tpg_param_cit);
config_group_init_type_name(&tattr->tpg_attrib_group, "attrib", &lio_target_tpg_attrib_cit);
tpg_cg->default_groups[0] = &tpg->tpg_np_group;
tpg_cg->default_groups[1] = &tpg->tpg_lun_group;
tpg_cg->default_groups[2] = &tpg->tpg_acl_group;
- tpg_cg->default_groups[3] = &tattr->tpg_attrib_group;
- tpg_cg->default_groups[4] = NULL;
+ tpg_cg->default_groups[3] = &tpg->tpg_param_group;
+ tpg_cg->default_groups[4] = &tattr->tpg_attrib_group;
+ tpg_cg->default_groups[5] = NULL;

if ((ret = iscsi_tpg_add_portal_group(tiqn, tpg)) < 0)
goto out;
diff --git a/drivers/lio-core/iscsi_target_core.h b/drivers/lio-core/iscsi_target_core.h
index 2df1972..fea0597 100644
--- a/drivers/lio-core/iscsi_target_core.h
+++ b/drivers/lio-core/iscsi_target_core.h
@@ -1337,6 +1337,7 @@ typedef struct iscsi_portal_group_s {
struct config_group tpg_np_group;
struct config_group tpg_lun_group;
struct config_group tpg_acl_group;
+ struct config_group tpg_param_group;
struct config_group tpg_group;
struct semaphore tpg_access_sem;
struct semaphore np_login_sem;
--
1.5.4.1



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