[RFC PATCH 5/19] Target_Core_Mod HBA core infrastructure

[Nicholas A. Bellinger]

The patch adds the core se_hba_t functionality that is used internally by
target_core_mod, as well as ConfigFS enabled fabric modules like LIO-Target v3.0
(iscsi_target_mod).

Signed-off-by: Nicholas A. Bellinger <nab@xxxxxxxxxxxxxxx>

diff --git a/drivers/target/target_core_hba.c b/drivers/target/target_core_hba.c
new file mode 100644
index 0000000..08e14b8
--- /dev/null
+++ b/drivers/target/target_core_hba.c
@@ -0,0 +1,260 @@
+/*******************************************************************************
+ * Filename:  target_core_hba.c
+ *
+ * This file copntains the iSCSI HBA Transport related functions.
+ *
+ * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
+ * Copyright (c) 2005, 2006, 2007 SBE, Inc.
+ * Copyright (c) 2007-2009 Rising Tide Software, Inc.
+ * Copyright (c) 2008-2009 Linux-iSCSI.org
+ *
+ * Nicholas A. Bellinger <nab@xxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ ******************************************************************************/
+
+
+#define TARGET_CORE_HBA_C
+
+#include <linux/net.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/smp_lock.h>
+#include <linux/in.h>
+#include <net/sock.h>
+#include <net/tcp.h>
+
+#include <target/target_core_base.h>
+#include <target/target_core_device.h>
+#include <target/target_core_device.h>
+#include <target/target_core_hba.h>
+#include <target/target_core_tpg.h>
+#include <target/target_core_transport.h>
+#include <target/target_core_plugin.h>
+#include <target/target_core_seobj.h>
+
+#undef TARGET_CORE_HBA_C
+
+se_hba_t *__core_get_hba_from_id(se_hba_t *hba)
+{
+	return ((down_interruptible(&hba->hba_access_sem) != 0) ? NULL : hba);
+}
+
+se_hba_t *core_get_hba_from_id(u32 hba_id, int addhba)
+{
+	se_hba_t *hba;
+
+	if (hba_id > (TRANSPORT_MAX_GLOBAL_HBAS-1)) {
+		printk(KERN_ERR "SE HBA_ID: %u exceeds TRANSPORT_MAX_GLOBAL"
+			"_HBAS-1: %u\n", hba_id, TRANSPORT_MAX_GLOBAL_HBAS-1);
+		return NULL;
+	}
+
+	hba = &se_global->hba_list[hba_id];
+
+	if (!addhba && !(hba->hba_status & HBA_STATUS_ACTIVE))
+		return NULL;
+
+	return __core_get_hba_from_id(hba);
+}
+EXPORT_SYMBOL(core_get_hba_from_id);
+
+se_hba_t *core_get_next_free_hba(void)
+{
+	se_hba_t *hba;
+	u32 i;
+
+	spin_lock(&se_global->hba_lock);
+	for (i = 0; i < TRANSPORT_MAX_GLOBAL_HBAS; i++) {
+		hba = &se_global->hba_list[i];
+		if (hba->hba_status != HBA_STATUS_FREE)
+			continue;
+
+		spin_unlock(&se_global->hba_lock);
+		return __core_get_hba_from_id(hba);
+	}
+	spin_unlock(&se_global->hba_lock);
+
+	printk(KERN_ERR "Unable to locate next free HBA\n");
+	return NULL;
+}
+
+void core_put_hba(se_hba_t *hba)
+{
+	up(&hba->hba_access_sem);
+}
+EXPORT_SYMBOL(core_put_hba);
+
+/*	se_core_add_hba():
+ *
+ *
+ */
+int se_core_add_hba(
+	se_hba_t *hba,
+	u32 plugin_dep_id)
+{
+	se_subsystem_api_t *t;
+	int ret = 0;
+
+	if (hba->hba_status & HBA_STATUS_ACTIVE)
+		return -EEXIST;
+
+	atomic_set(&hba->max_queue_depth, 0);
+	atomic_set(&hba->left_queue_depth, 0);
+
+	t = (se_subsystem_api_t *)plugin_get_obj(PLUGIN_TYPE_TRANSPORT,
+				hba->type, &ret);
+	if (!(t))
+		return -EINVAL;
+
+	ret = t->attach_hba(hba, plugin_dep_id);
+	if (ret < 0)
+		return ret;
+
+	hba->hba_status &= ~HBA_STATUS_FREE;
+	hba->hba_status |= HBA_STATUS_ACTIVE;
+	printk(KERN_INFO "CORE_HBA[%d] - Attached HBA to Generic Target"
+			" Core\n", hba->hba_id);
+
+	return 0;
+}
+EXPORT_SYMBOL(se_core_add_hba);
+
+static int se_core_shutdown_hba(
+	se_hba_t *hba)
+{
+	int ret = 0;
+	se_subsystem_api_t *t;
+
+	t = (se_subsystem_api_t *)plugin_get_obj(PLUGIN_TYPE_TRANSPORT,
+				hba->type, &ret);
+	if (!(t))
+		return ret;
+
+	if (t->detach_hba(hba) < 0)
+		return -1;
+
+	return 0;
+}
+
+/*	se_core_del_hba():
+ *
+ *
+ */
+int se_core_del_hba(
+	se_hba_t *hba)
+{
+	se_device_t *dev, *dev_tmp;
+
+	if (!(hba->hba_status & HBA_STATUS_ACTIVE)) {
+		printk(KERN_ERR "HBA ID: %d Status: INACTIVE, ignoring"
+			" delhbafromtarget request\n", hba->hba_id);
+		return -EINVAL;
+	}
+
+	/*
+	 * Do not allow the se_hba_t to be released if references exist to
+	 * from se_device_t->se_lun_t.
+	 */
+	if (se_check_devices_access(hba) < 0) {
+		printk(KERN_ERR "CORE_HBA[%u] - **ERROR** - Unable to release"
+			" HBA with active LUNs\n", hba->hba_id);
+		return -EINVAL;
+	}
+
+	spin_lock(&hba->device_lock);
+	list_for_each_entry_safe(dev, dev_tmp, &hba->hba_dev_list, dev_list) {
+
+		se_clear_dev_ports(dev);
+		spin_unlock(&hba->device_lock);
+
+		se_release_device_for_hba(dev);
+
+		spin_lock(&hba->device_lock);
+	}
+	spin_unlock(&hba->device_lock);
+
+	se_core_shutdown_hba(hba);
+
+	hba->type = 0;
+	hba->transport = NULL;
+	hba->hba_status &= ~HBA_STATUS_ACTIVE;
+	hba->hba_status |= HBA_STATUS_FREE;
+
+	printk(KERN_INFO "CORE_HBA[%d] - Detached HBA from Generic Target"
+			" Core\n", hba->hba_id);
+	return 0;
+}
+EXPORT_SYMBOL(se_core_del_hba);
+
+static void se_hba_transport_shutdown(se_hba_t *hba)
+{
+	if (!(HBA_TRANSPORT(hba)->shutdown_hba))
+		return;
+
+	HBA_TRANSPORT(hba)->shutdown_hba(hba);
+}
+
+void iscsi_disable_all_hbas(void)
+{
+	int i;
+	se_hba_t *hba;
+
+	spin_lock(&se_global->hba_lock);
+	for (i = 0; i < TRANSPORT_MAX_GLOBAL_HBAS; i++) {
+		hba = &se_global->hba_list[i];
+
+		if (!(hba->hba_status & HBA_STATUS_ACTIVE))
+			continue;
+
+		spin_unlock(&se_global->hba_lock);
+		se_disable_devices_for_hba(hba);
+		spin_lock(&se_global->hba_lock);
+	}
+	spin_unlock(&se_global->hba_lock);
+}
+EXPORT_SYMBOL(iscsi_disable_all_hbas);
+
+/*	iscsi_hba_del_all_hbas():
+ *
+ *
+ */
+void iscsi_hba_del_all_hbas(void)
+{
+	int i;
+	se_hba_t *hba;
+
+	spin_lock(&se_global->hba_lock);
+	for (i = 0; i < TRANSPORT_MAX_GLOBAL_HBAS; i++) {
+		hba = &se_global->hba_list[i];
+
+		if (!(hba->hba_status & HBA_STATUS_ACTIVE))
+			continue;
+#if 0
+		printk(KERN_INFO "Shutting down HBA ID: %d, HBA_TYPE: %d,"
+			" STATUS: 0x%08x\n", hba->hba_id, hba->type,
+			hba->hba_status);
+#endif
+		spin_unlock(&se_global->hba_lock);
+		se_hba_transport_shutdown(hba);
+		se_core_del_hba(hba);
+		spin_lock(&se_global->hba_lock);
+	}
+	spin_unlock(&se_global->hba_lock);
+}
+EXPORT_SYMBOL(iscsi_hba_del_all_hbas);
diff --git a/include/target/target_core_hba.h b/include/target/target_core_hba.h
new file mode 100644
index 0000000..ebab906
--- /dev/null
+++ b/include/target/target_core_hba.h
@@ -0,0 +1,44 @@
+/*******************************************************************************
+ * Filename:  target_core_hba.h
+ *
+ * This file contains the iSCSI HBA Transport related definitions.
+ *
+ * Copyright (c) 2003-2004 PyX Technologies, Inc.
+ * Copyright (c) 2005, 2006, 2007 SBE, Inc.
+ * Copyright (c) 2007-2009 Rising Tide Software, Inc.
+ * Copyright (c) 2008-2009 Linux-iSCSI.org
+ *
+ * Nicholas A. Bellinger <nab@xxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ ******************************************************************************/
+
+
+#ifndef TARGET_CORE_HBA_H
+#define TARGET_CORE_HBA_H
+
+extern se_global_t *se_global;
+
+extern struct se_hba_s *__core_get_hba_from_id(struct se_hba_s *);
+extern struct se_hba_s *core_get_hba_from_id(u32, int);
+extern struct se_hba_s *core_get_next_free_hba(void);
+extern void core_put_hba(struct se_hba_s *);
+extern int se_core_add_hba(struct se_hba_s *, u32);
+extern int se_core_del_hba(struct se_hba_s *);
+extern void iscsi_disable_all_hbas(void);
+extern void iscsi_hba_del_all_hbas(void);
+
+#endif /* TARGET_CORE_HBA_H */


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