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