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Date: Sat, 04 Apr 2009 21:02:00 -0700
From: "Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To: LKML <linux-kernel@...r.kernel.org>,
linux-scsi <linux-scsi@...r.kernel.org>
Cc: James Bottomley <James.Bottomley@...senPartnership.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Hannes Reinecke <hare@...e.de>,
FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
Mike Christie <michaelc@...wisc.edu>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
Ming Zhang <blackmagic02881@...il.com>,
Philipp Reisner <philipp.reisner@...bit.com>,
Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [RFC PATCH 10/19] Target_Core_Mod Subsystem and SE Object plugin
infrastructure
This patch adds the simple plugin infrastructure used by subsystem and seobj plugins.
Signed-off-by: Nicholas A. Bellinger <nab@...ux-iscsi.org>
diff --git a/drivers/target/target_core_plugin.c b/drivers/target/target_core_plugin.c
new file mode 100644
index 0000000..55870a9
--- /dev/null
+++ b/drivers/target/target_core_plugin.c
@@ -0,0 +1,310 @@
+/*******************************************************************************
+ * Filename: target_core_plugin.c
+ *
+ * Copyright (c) 2006-2007 SBE, Inc. All Rights Reserved.
+ * Copyright (c) 2007-2009 Rising Tide Software, Inc.
+ * Copyright (c) 2008-2009 Linux-iSCSI.org
+ *
+ * Nicholas A. Bellinger <nab@...nel.org>
+ *
+ * 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_PLUGIN_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_hba.h>
+#include <target/target_core_seobj.h>
+#include <target/target_core_transport.h>
+#include <target/target_core_plugin.h>
+
+#undef TARGET_CORE_PLUGIN_C
+
+void plugin_load_all_classes(void)
+{
+ /*
+ * Setup Transport Plugins
+ */
+ plugin_register_class(PLUGIN_TYPE_TRANSPORT, "TRANSPORT", MAX_PLUGINS);
+ transport_load_plugins();
+
+ /*
+ * Setup Storage Engine Object Plugins
+ */
+ plugin_register_class(PLUGIN_TYPE_OBJ, "OBJ", MAX_PLUGINS);
+ se_obj_load_plugins();
+}
+EXPORT_SYMBOL(plugin_load_all_classes);
+
+se_plugin_class_t *plugin_get_class(
+ u32 plugin_class_type)
+{
+ se_plugin_class_t *pc;
+
+ if (plugin_class_type > MAX_PLUGIN_CLASSES) {
+ printk(KERN_ERR "Passed plugin class type: %u exceeds"
+ " MAX_PLUGIN_CLASSES: %d\n", plugin_class_type,
+ MAX_PLUGIN_CLASSES);
+ return NULL;
+ }
+
+ pc = &se_global->plugin_class_list[plugin_class_type];
+ if (!pc->plugin_array)
+ return NULL;
+
+ return pc;
+}
+
+int plugin_register_class(
+ u32 plugin_class_type,
+ unsigned char *plugin_class_name,
+ int max_plugins)
+{
+ u32 i;
+ se_plugin_class_t *pc;
+ se_plugin_t *p;
+
+ if (strlen(plugin_class_name) > MAX_PLUGIN_CLASS_NAME) {
+ printk(KERN_ERR "plugin_class_name exceeds MAX_PLUGIN_CLASS"
+ "_NAME: %u\n", MAX_PLUGIN_CLASS_NAME);
+ return -1;
+ }
+ spin_lock(&se_global->plugin_class_lock);
+ if (plugin_class_type > MAX_PLUGIN_CLASSES) {
+ printk(KERN_ERR "Passed plugin class type: %u exceeds"
+ " MAX_PLUGIN_CLASSES: %d\n", plugin_class_type,
+ MAX_PLUGIN_CLASSES);
+ return -1;
+ }
+
+ pc = &se_global->plugin_class_list[plugin_class_type];
+ if (pc->plugin_array) {
+ printk(KERN_ERR "Plugin Class Type: %u already exists\n",
+ plugin_class_type);
+ return -1;
+ }
+ spin_unlock(&se_global->plugin_class_lock);
+
+ pc->plugin_array = kzalloc(sizeof(se_plugin_t) * max_plugins,
+ GFP_KERNEL);
+ if (!(pc->plugin_array)) {
+ printk(KERN_ERR "Unable to locate pc->plugin_array\n");
+ return -1;
+ }
+
+ spin_lock_init(&pc->plugin_lock);
+ pc->max_plugins = max_plugins;
+ pc->plugin_class = plugin_class_type;
+ snprintf(pc->plugin_class_name, MAX_PLUGIN_CLASS_NAME,
+ "%s", plugin_class_name);
+
+ for (i = 0; i < max_plugins; i++) {
+ p = &pc->plugin_array[i];
+ p->plugin_class = pc;
+ }
+
+ printk(KERN_INFO "SE_PC[%u] - Registered Plugin Class: %s\n",
+ pc->plugin_class, pc->plugin_class_name);
+
+ return 0;
+}
+EXPORT_SYMBOL(plugin_register_class);
+
+int plugin_deregister_class(u32 plugin_class_type)
+{
+ int i;
+ se_plugin_class_t *pc;
+ se_plugin_t *p;
+
+ pc = plugin_get_class(plugin_class_type);
+ if (!(pc))
+ return -1;
+
+ for (i = 0; i < MAX_PLUGINS; i++) {
+ p = &pc->plugin_array[i];
+
+ if (!p->plugin_obj)
+ continue;
+
+ plugin_deregister(i, plugin_class_type);
+ }
+
+ kfree(pc->plugin_array);
+ pc->plugin_array = NULL;
+
+ return 0;
+}
+EXPORT_SYMBOL(plugin_deregister_class);
+
+void plugin_unload_all_classes(void)
+{
+ u32 i;
+ se_plugin_class_t *pc;
+
+ for (i = 0; i < MAX_PLUGIN_CLASSES; i++) {
+ pc = &se_global->plugin_class_list[i];
+
+ if (!pc->plugin_array)
+ continue;
+
+ plugin_deregister_class(i);
+ }
+
+ return;
+}
+EXPORT_SYMBOL(plugin_unload_all_classes);
+
+void *plugin_get_obj(
+ u32 plugin_class,
+ u32 plugin_loc,
+ int *ret)
+{
+ se_plugin_class_t *pc;
+ se_plugin_t *p;
+
+ pc = plugin_get_class(plugin_class);
+ if (!(pc))
+ return NULL;
+
+ spin_lock(&pc->plugin_lock);
+ if (plugin_loc > pc->max_plugins) {
+ printk(KERN_ERR "Passed plugin_loc: %d exceeds"
+ " pc->max_plugins: %d\n", plugin_loc, pc->max_plugins);
+ goto out;
+ }
+
+ p = &pc->plugin_array[plugin_loc];
+ if (!p->plugin_obj) {
+ printk(KERN_ERR "Passed plugin_loc: %u does not exist!\n",
+ plugin_loc);
+ goto out;
+ }
+ spin_unlock(&pc->plugin_lock);
+
+ *ret = 0;
+ return p->plugin_obj;
+out:
+ *ret = -1;
+ spin_unlock(&pc->plugin_lock);
+ return NULL;
+}
+EXPORT_SYMBOL(plugin_get_obj);
+
+struct se_plugin_s *plugin_register(
+ void *obj,
+ u32 plugin_loc,
+ unsigned char *plugin_name,
+ u32 plugin_class,
+ void (*get_plugin_info)(void *, char *, int *),
+ int *ret)
+{
+ se_plugin_class_t *pc;
+ se_plugin_t *p;
+
+ if (!obj) {
+ printk(KERN_ERR "obj or plugin_class pointers are NULL!\n");
+ return NULL;
+ }
+
+ if (strlen(plugin_name) > MAX_PLUGIN_NAME) {
+ printk(KERN_ERR "plugin_name exceeds MAX_PLUGIN_NAME: %u\n",
+ MAX_PLUGIN_NAME);
+ return NULL;
+ }
+
+ pc = plugin_get_class(plugin_class);
+ if (!(pc))
+ return NULL;
+
+ spin_lock(&pc->plugin_lock);
+ if (plugin_loc > pc->max_plugins) {
+ printk(KERN_ERR "Passed plugin_loc: %u exceeds pc->max_plugins:"
+ " %d\n", plugin_loc, pc->max_plugins);
+ *ret = -1;
+ goto out;
+ }
+
+ p = &pc->plugin_array[plugin_loc];
+ if (p->plugin_obj) {
+ printk(KERN_ERR "Passed plugin_loc: %u already registered\n",
+ plugin_loc);
+ *ret = -1;
+ goto out;
+ }
+
+ p->plugin_obj = obj;
+ p->get_plugin_info = get_plugin_info;
+ p->plugin_state = PLUGIN_REGISTERED;
+ p->plugin_type = plugin_loc;
+ snprintf(p->plugin_name, MAX_PLUGIN_NAME, "%s", plugin_name);
+
+ printk(KERN_INFO "PLUGIN_%s[%u] - %s registered\n",
+ pc->plugin_class_name, plugin_loc, plugin_name);
+ spin_unlock(&pc->plugin_lock);
+
+ return p;
+
+out:
+ spin_unlock(&pc->plugin_lock);
+ return NULL;
+}
+EXPORT_SYMBOL(plugin_register);
+
+int plugin_deregister(
+ u32 plugin_loc,
+ u32 plugin_class)
+{
+ int ret = 0;
+ se_plugin_class_t *pc;
+ se_plugin_t *p;
+
+ pc = plugin_get_class(plugin_class);
+ if (!(pc))
+ return -1;
+
+ spin_lock(&pc->plugin_lock);
+ if (plugin_loc > pc->max_plugins) {
+ printk(KERN_ERR "Passed plugin_loc: %u exceeds pc->max_plugins:"
+ " %d\n", plugin_loc, pc->max_plugins);
+ ret = -1;
+ goto out;
+ }
+
+ p = &pc->plugin_array[plugin_loc];
+ if (!p->plugin_obj) {
+ printk(KERN_ERR "Passed plugin_loc: %u not active!\n",
+ plugin_loc);
+ ret = -1;
+ goto out;
+ }
+
+ p->plugin_obj = NULL;
+ p->plugin_state = PLUGIN_FREE;
+
+out:
+ spin_unlock(&pc->plugin_lock);
+ return ret;
+}
diff --git a/include/target/target_core_plugin.h b/include/target/target_core_plugin.h
new file mode 100644
index 0000000..92abe23
--- /dev/null
+++ b/include/target/target_core_plugin.h
@@ -0,0 +1,71 @@
+/*******************************************************************************
+ * Filename: target_core_plugin.h
+ *
+ * Copyright (c) 2006-2007 SBE, Inc. All Rights Reserved.
+ * Copyright (c) 2007-2009 Rising Tide Software, Inc.
+ * Copyright (c) 2008-2009 Linux-iSCSI.org
+ *
+ * Nicholas A. Bellinger <nab@...nel.org>
+ *
+ * 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_PLUGIN_H
+#define TARGET_CORE_PLUGIN_H
+
+#define PLUGIN_TYPE_TRANSPORT 0
+#define PLUGIN_TYPE_OBJ 1
+
+#define MAX_PLUGINS 32
+#define MAX_PLUGIN_CLASSES 16
+#define MAX_PLUGIN_CLASS_NAME 16
+#define MAX_PLUGIN_NAME 16
+
+#define PLUGIN_FREE 0
+#define PLUGIN_REGISTERED 1
+
+extern se_global_t *se_global;
+
+extern void plugin_load_all_classes(void);
+extern struct se_plugin_class_s *plugin_get_class(u32);
+extern int plugin_register_class(u32, unsigned char *, int);
+extern int plugin_deregister_class(u32);
+extern void plugin_unload_all_classes(void);
+extern void *plugin_get_obj(u32, u32, int *);
+extern struct se_plugin_s *plugin_register(void *, u32, unsigned char *, u32,
+ void (*get_plugin_info)(void *, char *, int *),
+ int *);
+extern int plugin_deregister(u32, u32);
+
+typedef struct se_plugin_class_s {
+ unsigned char plugin_class_name[MAX_PLUGIN_CLASS_NAME];
+ u32 plugin_class;
+ u32 max_plugins;
+ struct se_plugin_s *plugin_array;
+ spinlock_t plugin_lock;
+} se_plugin_class_t;
+
+typedef struct se_plugin_s {
+ unsigned char plugin_name[MAX_PLUGIN_NAME];
+ int plugin_state;
+ u32 plugin_type;
+ se_plugin_class_t *plugin_class;
+ void *plugin_obj;
+ void (*get_plugin_info)(void *, char *, int *);
+} se_plugin_t;
+
+#endif /* TARGET_CORE_PLUGIN_H */
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