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-rw-r--r--drivers/target/tcm_fc/tfc_conf.c491
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);