1 files changed, 491 insertions, 0 deletions
diff --git a/drivers/target/tcm_fc/tfc_conf.c b/drivers/target/tcm_fc/tfc_conf.c
new file mode 100644
index 000000000..1a38c98f6
--- /dev/null
+++ b/drivers/target/tcm_fc/tfc_conf.c
@@ -0,0 +1,491 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*******************************************************************************
+ * Filename:  tcm_fc.c
+ *
+ * This file contains the configfs implementation for TCM_fc fabric node.
+ * Based on tcm_loop_configfs.c
+ *
+ * Copyright (c) 2010 Cisco Systems, Inc.
+ * Copyright (c) 2009,2010 Rising Tide, Inc.
+ * Copyright (c) 2009,2010 Linux-iSCSI.org
+ *
+ * Copyright (c) 2009,2010 Nicholas A. Bellinger <nab@linux-iscsi.org>
+ *
+ ****************************************************************************/
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <generated/utsrelease.h>
+#include <linux/utsname.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/kthread.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/configfs.h>
+#include <linux/kernel.h>
+#include <linux/ctype.h>
+#include <asm/unaligned.h>
+#include <scsi/libfc.h>
+
+#include <target/target_core_base.h>
+#include <target/target_core_fabric.h>
+
+#include "tcm_fc.h"
+
+static LIST_HEAD(ft_wwn_list);
+DEFINE_MUTEX(ft_lport_lock);
+
+unsigned int ft_debug_logging;
+module_param_named(debug_logging, ft_debug_logging, int, S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels");
+
+/*
+ * Parse WWN.
+ * If strict, we require lower-case hex and colon separators to be sure
+ * the name is the same as what would be generated by ft_format_wwn()
+ * so the name and wwn are mapped one-to-one.
+ */
+static ssize_t ft_parse_wwn(const char *name, u64 *wwn, int strict)
+{
+	const char *cp;
+	char c;
+	u32 byte = 0;
+	u32 pos = 0;
+	u32 err;
+	int val;
+
+	*wwn = 0;
+	for (cp = name; cp < &name[FT_NAMELEN - 1]; cp++) {
+		c = *cp;
+		if (c == '\n' && cp[1] == '\0')
+			continue;
+		if (strict && pos++ == 2 && byte++ < 7) {
+			pos = 0;
+			if (c == ':')
+				continue;
+			err = 1;
+			goto fail;
+		}
+		if (c == '\0') {
+			err = 2;
+			if (strict && byte != 8)
+				goto fail;
+			return cp - name;
+		}
+		err = 3;
+		val = hex_to_bin(c);
+		if (val < 0 || (strict && isupper(c)))
+			goto fail;
+		*wwn = (*wwn << 4) | val;
+	}
+	err = 4;
+fail:
+	pr_debug("err %u len %zu pos %u byte %u\n",
+		    err, cp - name, pos, byte);
+	return -1;
+}
+
+ssize_t ft_format_wwn(char *buf, size_t len, u64 wwn)
+{
+	u8 b[8];
+
+	put_unaligned_be64(wwn, b);
+	return snprintf(buf, len,
+		 "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x",
+		 b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7]);
+}
+
+static ssize_t ft_wwn_show(void *arg, char *buf)
+{
+	u64 *wwn = arg;
+	ssize_t len;
+
+	len = ft_format_wwn(buf, PAGE_SIZE - 2, *wwn);
+	buf[len++] = '\n';
+	return len;
+}
+
+static ssize_t ft_wwn_store(void *arg, const char *buf, size_t len)
+{
+	ssize_t ret;
+	u64 wwn;
+
+	ret = ft_parse_wwn(buf, &wwn, 0);
+	if (ret > 0)
+		*(u64 *)arg = wwn;
+	return ret;
+}
+
+/*
+ * ACL auth ops.
+ */
+
+static ssize_t ft_nacl_port_name_show(struct config_item *item, char *page)
+{
+	struct se_node_acl *se_nacl = acl_to_nacl(item);
+	struct ft_node_acl *acl = container_of(se_nacl,
+			struct ft_node_acl, se_node_acl);
+
+	return ft_wwn_show(&acl->node_auth.port_name, page);
+}
+
+static ssize_t ft_nacl_port_name_store(struct config_item *item,
+		const char *page, size_t count)
+{
+	struct se_node_acl *se_nacl = acl_to_nacl(item);
+	struct ft_node_acl *acl = container_of(se_nacl,
+			struct ft_node_acl, se_node_acl);
+
+	return ft_wwn_store(&acl->node_auth.port_name, page, count);
+}
+
+static ssize_t ft_nacl_node_name_show(struct config_item *item,
+		char *page)
+{
+	struct se_node_acl *se_nacl = acl_to_nacl(item);
+	struct ft_node_acl *acl = container_of(se_nacl,
+			struct ft_node_acl, se_node_acl);
+
+	return ft_wwn_show(&acl->node_auth.node_name, page);
+}
+
+static ssize_t ft_nacl_node_name_store(struct config_item *item,
+		const char *page, size_t count)
+{
+	struct se_node_acl *se_nacl = acl_to_nacl(item);
+	struct ft_node_acl *acl = container_of(se_nacl,
+			struct ft_node_acl, se_node_acl);
+
+	return ft_wwn_store(&acl->node_auth.node_name, page, count);
+}
+
+CONFIGFS_ATTR(ft_nacl_, node_name);
+CONFIGFS_ATTR(ft_nacl_, port_name);
+
+static ssize_t ft_nacl_tag_show(struct config_item *item,
+		char *page)
+{
+	return snprintf(page, PAGE_SIZE, "%s", acl_to_nacl(item)->acl_tag);
+}
+
+static ssize_t ft_nacl_tag_store(struct config_item *item,
+		const char *page, size_t count)
+{
+	struct se_node_acl *se_nacl = acl_to_nacl(item);
+	int ret;
+
+	ret = core_tpg_set_initiator_node_tag(se_nacl->se_tpg, se_nacl, page);
+
+	if (ret < 0)
+		return ret;
+	return count;
+}
+
+CONFIGFS_ATTR(ft_nacl_, tag);
+
+static struct configfs_attribute *ft_nacl_base_attrs[] = {
+	&ft_nacl_attr_port_name,
+	&ft_nacl_attr_node_name,
+	&ft_nacl_attr_tag,
+	NULL,
+};
+
+/*
+ * ACL ops.
+ */
+
+/*
+ * Add ACL for an initiator.  The ACL is named arbitrarily.
+ * The port_name and/or node_name are attributes.
+ */
+static int ft_init_nodeacl(struct se_node_acl *nacl, const char *name)
+{
+	struct ft_node_acl *acl =
+		container_of(nacl, struct ft_node_acl, se_node_acl);
+	u64 wwpn;
+
+	if (ft_parse_wwn(name, &wwpn, 1) < 0)
+		return -EINVAL;
+
+	acl->node_auth.port_name = wwpn;
+	return 0;
+}
+
+/*
+ * local_port port_group (tpg) ops.
+ */
+static struct se_portal_group *ft_add_tpg(struct se_wwn *wwn, const char *name)
+{
+	struct ft_lport_wwn *ft_wwn;
+	struct ft_tpg *tpg;
+	struct workqueue_struct *wq;
+	unsigned long index;
+	int ret;
+
+	pr_debug("tcm_fc: add tpg %s\n", name);
+
+	/*
+	 * Name must be "tpgt_" followed by the index.
+	 */
+	if (strstr(name, "tpgt_") != name)
+		return NULL;
+
+	ret = kstrtoul(name + 5, 10, &index);
+	if (ret)
+		return NULL;
+	if (index > UINT_MAX)
+		return NULL;
+
+	if ((index != 1)) {
+		pr_err("Error, a single TPG=1 is used for HW port mappings\n");
+		return ERR_PTR(-ENOSYS);
+	}
+
+	ft_wwn = container_of(wwn, struct ft_lport_wwn, se_wwn);
+	tpg = kzalloc(sizeof(*tpg), GFP_KERNEL);
+	if (!tpg)
+		return NULL;
+	tpg->index = index;
+	tpg->lport_wwn = ft_wwn;
+	INIT_LIST_HEAD(&tpg->lun_list);
+
+	wq = alloc_workqueue("tcm_fc", 0, 1);
+	if (!wq) {
+		kfree(tpg);
+		return NULL;
+	}
+
+	ret = core_tpg_register(wwn, &tpg->se_tpg, SCSI_PROTOCOL_FCP);
+	if (ret < 0) {
+		destroy_workqueue(wq);
+		kfree(tpg);
+		return NULL;
+	}
+	tpg->workqueue = wq;
+
+	mutex_lock(&ft_lport_lock);
+	ft_wwn->tpg = tpg;
+	mutex_unlock(&ft_lport_lock);
+
+	return &tpg->se_tpg;
+}
+
+static void ft_del_tpg(struct se_portal_group *se_tpg)
+{
+	struct ft_tpg *tpg = container_of(se_tpg, struct ft_tpg, se_tpg);
+	struct ft_lport_wwn *ft_wwn = tpg->lport_wwn;
+
+	pr_debug("del tpg %s\n",
+		    config_item_name(&tpg->se_tpg.tpg_group.cg_item));
+
+	destroy_workqueue(tpg->workqueue);
+
+	/* Wait for sessions to be freed thru RCU, for BUG_ON below */
+	synchronize_rcu();
+
+	mutex_lock(&ft_lport_lock);
+	ft_wwn->tpg = NULL;
+	if (tpg->tport) {
+		tpg->tport->tpg = NULL;
+		tpg->tport = NULL;
+	}
+	mutex_unlock(&ft_lport_lock);
+
+	core_tpg_deregister(se_tpg);
+	kfree(tpg);
+}
+
+/*
+ * Verify that an lport is configured to use the tcm_fc module, and return
+ * the target port group that should be used.
+ *
+ * The caller holds ft_lport_lock.
+ */
+struct ft_tpg *ft_lport_find_tpg(struct fc_lport *lport)
+{
+	struct ft_lport_wwn *ft_wwn;
+
+	list_for_each_entry(ft_wwn, &ft_wwn_list, ft_wwn_node) {
+		if (ft_wwn->wwpn == lport->wwpn)
+			return ft_wwn->tpg;
+	}
+	return NULL;
+}
+
+/*
+ * target config instance ops.
+ */
+
+/*
+ * Add lport to allowed config.
+ * The name is the WWPN in lower-case ASCII, colon-separated bytes.
+ */
+static struct se_wwn *ft_add_wwn(
+	struct target_fabric_configfs *tf,
+	struct config_group *group,
+	const char *name)
+{
+	struct ft_lport_wwn *ft_wwn;
+	struct ft_lport_wwn *old_ft_wwn;
+	u64 wwpn;
+
+	pr_debug("add wwn %s\n", name);
+	if (ft_parse_wwn(name, &wwpn, 1) < 0)
+		return NULL;
+	ft_wwn = kzalloc(sizeof(*ft_wwn), GFP_KERNEL);
+	if (!ft_wwn)
+		return NULL;
+	ft_wwn->wwpn = wwpn;
+
+	mutex_lock(&ft_lport_lock);
+	list_for_each_entry(old_ft_wwn, &ft_wwn_list, ft_wwn_node) {
+		if (old_ft_wwn->wwpn == wwpn) {
+			mutex_unlock(&ft_lport_lock);
+			kfree(ft_wwn);
+			return NULL;
+		}
+	}
+	list_add_tail(&ft_wwn->ft_wwn_node, &ft_wwn_list);
+	ft_format_wwn(ft_wwn->name, sizeof(ft_wwn->name), wwpn);
+	mutex_unlock(&ft_lport_lock);
+
+	return &ft_wwn->se_wwn;
+}
+
+static void ft_del_wwn(struct se_wwn *wwn)
+{
+	struct ft_lport_wwn *ft_wwn = container_of(wwn,
+				struct ft_lport_wwn, se_wwn);
+
+	pr_debug("del wwn %s\n", ft_wwn->name);
+	mutex_lock(&ft_lport_lock);
+	list_del(&ft_wwn->ft_wwn_node);
+	mutex_unlock(&ft_lport_lock);
+
+	kfree(ft_wwn);
+}
+
+static ssize_t ft_wwn_version_show(struct config_item *item, char *page)
+{
+	return sprintf(page, "TCM FC " FT_VERSION " on %s/%s on "
+		""UTS_RELEASE"\n",  utsname()->sysname, utsname()->machine);
+}
+
+CONFIGFS_ATTR_RO(ft_wwn_, version);
+
+static struct configfs_attribute *ft_wwn_attrs[] = {
+	&ft_wwn_attr_version,
+	NULL,
+};
+
+static inline struct ft_tpg *ft_tpg(struct se_portal_group *se_tpg)
+{
+	return container_of(se_tpg, struct ft_tpg, se_tpg);
+}
+
+static char *ft_get_fabric_wwn(struct se_portal_group *se_tpg)
+{
+	return ft_tpg(se_tpg)->lport_wwn->name;
+}
+
+static u16 ft_get_tag(struct se_portal_group *se_tpg)
+{
+	/*
+	 * This tag is used when forming SCSI Name identifier in EVPD=1 0x83
+	 * to represent the SCSI Target Port.
+	 */
+	return ft_tpg(se_tpg)->index;
+}
+
+static int ft_check_false(struct se_portal_group *se_tpg)
+{
+	return 0;
+}
+
+static void ft_set_default_node_attr(struct se_node_acl *se_nacl)
+{
+}
+
+static u32 ft_tpg_get_inst_index(struct se_portal_group *se_tpg)
+{
+	return ft_tpg(se_tpg)->index;
+}
+
+static const struct target_core_fabric_ops ft_fabric_ops = {
+	.module =			THIS_MODULE,
+	.fabric_name =			"fc",
+	.node_acl_size =		sizeof(struct ft_node_acl),
+	.tpg_get_wwn =			ft_get_fabric_wwn,
+	.tpg_get_tag =			ft_get_tag,
+	.tpg_check_demo_mode =		ft_check_false,
+	.tpg_check_demo_mode_cache =	ft_check_false,
+	.tpg_check_demo_mode_write_protect = ft_check_false,
+	.tpg_check_prod_mode_write_protect = ft_check_false,
+	.tpg_get_inst_index =		ft_tpg_get_inst_index,
+	.check_stop_free =		ft_check_stop_free,
+	.release_cmd =			ft_release_cmd,
+	.close_session =		ft_sess_close,
+	.sess_get_index =		ft_sess_get_index,
+	.sess_get_initiator_sid =	NULL,
+	.write_pending =		ft_write_pending,
+	.set_default_node_attributes =	ft_set_default_node_attr,
+	.get_cmd_state =		ft_get_cmd_state,
+	.queue_data_in =		ft_queue_data_in,
+	.queue_status =			ft_queue_status,
+	.queue_tm_rsp =			ft_queue_tm_resp,
+	.aborted_task =			ft_aborted_task,
+	/*
+	 * Setup function pointers for generic logic in
+	 * target_core_fabric_configfs.c
+	 */
+	.fabric_make_wwn =		&ft_add_wwn,
+	.fabric_drop_wwn =		&ft_del_wwn,
+	.fabric_make_tpg =		&ft_add_tpg,
+	.fabric_drop_tpg =		&ft_del_tpg,
+	.fabric_init_nodeacl =		&ft_init_nodeacl,
+
+	.tfc_wwn_attrs			= ft_wwn_attrs,
+	.tfc_tpg_nacl_base_attrs	= ft_nacl_base_attrs,
+};
+
+static struct notifier_block ft_notifier = {
+	.notifier_call = ft_lport_notify
+};
+
+static int __init ft_init(void)
+{
+	int ret;
+
+	ret = target_register_template(&ft_fabric_ops);
+	if (ret)
+		goto out;
+
+	ret = fc_fc4_register_provider(FC_TYPE_FCP, &ft_prov);
+	if (ret)
+		goto out_unregister_template;
+
+	blocking_notifier_chain_register(&fc_lport_notifier_head, &ft_notifier);
+	fc_lport_iterate(ft_lport_add, NULL);
+	return 0;
+
+out_unregister_template:
+	target_unregister_template(&ft_fabric_ops);
+out:
+	return ret;
+}
+
+static void __exit ft_exit(void)
+{
+	blocking_notifier_chain_unregister(&fc_lport_notifier_head,
+					   &ft_notifier);
+	fc_fc4_deregister_provider(FC_TYPE_FCP, &ft_prov);
+	fc_lport_iterate(ft_lport_del, NULL);
+	target_unregister_template(&ft_fabric_ops);
+	synchronize_rcu();
+}
+
+MODULE_DESCRIPTION("FC TCM fabric driver " FT_VERSION);
+MODULE_LICENSE("GPL");
+module_init(ft_init);
+module_exit(ft_exit);