4873 lines
133 KiB
C
4873 lines
133 KiB
C
/*******************************************************************************
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* Filename: target_core_transport.c
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*
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* This file contains the Generic Target Engine Core.
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*
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* Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc.
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* Copyright (c) 2005, 2006, 2007 SBE, Inc.
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* Copyright (c) 2007-2010 Rising Tide Systems
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* Copyright (c) 2008-2010 Linux-iSCSI.org
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*
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* Nicholas A. Bellinger <nab@kernel.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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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******************************************************************************/
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#include <linux/net.h>
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#include <linux/delay.h>
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#include <linux/string.h>
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#include <linux/timer.h>
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#include <linux/slab.h>
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#include <linux/blkdev.h>
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#include <linux/spinlock.h>
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#include <linux/kthread.h>
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#include <linux/in.h>
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#include <linux/cdrom.h>
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#include <linux/module.h>
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#include <linux/ratelimit.h>
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#include <asm/unaligned.h>
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#include <net/sock.h>
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#include <net/tcp.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_tcq.h>
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#include <target/target_core_base.h>
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#include <target/target_core_backend.h>
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#include <target/target_core_fabric.h>
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#include <target/target_core_configfs.h>
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#include "target_core_internal.h"
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#include "target_core_alua.h"
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#include "target_core_pr.h"
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#include "target_core_ua.h"
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static int sub_api_initialized;
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static struct workqueue_struct *target_completion_wq;
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static struct kmem_cache *se_sess_cache;
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struct kmem_cache *se_ua_cache;
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struct kmem_cache *t10_pr_reg_cache;
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struct kmem_cache *t10_alua_lu_gp_cache;
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struct kmem_cache *t10_alua_lu_gp_mem_cache;
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struct kmem_cache *t10_alua_tg_pt_gp_cache;
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struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
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static int transport_generic_write_pending(struct se_cmd *);
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static int transport_processing_thread(void *param);
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static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *);
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static void transport_complete_task_attr(struct se_cmd *cmd);
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static void transport_handle_queue_full(struct se_cmd *cmd,
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struct se_device *dev);
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static void transport_free_dev_tasks(struct se_cmd *cmd);
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static int transport_generic_get_mem(struct se_cmd *cmd);
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static void transport_put_cmd(struct se_cmd *cmd);
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static void transport_remove_cmd_from_queue(struct se_cmd *cmd);
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static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq);
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static void target_complete_ok_work(struct work_struct *work);
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int init_se_kmem_caches(void)
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{
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se_sess_cache = kmem_cache_create("se_sess_cache",
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sizeof(struct se_session), __alignof__(struct se_session),
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0, NULL);
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if (!se_sess_cache) {
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pr_err("kmem_cache_create() for struct se_session"
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" failed\n");
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goto out;
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}
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se_ua_cache = kmem_cache_create("se_ua_cache",
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sizeof(struct se_ua), __alignof__(struct se_ua),
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0, NULL);
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if (!se_ua_cache) {
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pr_err("kmem_cache_create() for struct se_ua failed\n");
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goto out_free_sess_cache;
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}
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t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
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sizeof(struct t10_pr_registration),
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__alignof__(struct t10_pr_registration), 0, NULL);
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if (!t10_pr_reg_cache) {
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pr_err("kmem_cache_create() for struct t10_pr_registration"
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" failed\n");
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goto out_free_ua_cache;
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}
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t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
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sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
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0, NULL);
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if (!t10_alua_lu_gp_cache) {
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pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
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" failed\n");
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goto out_free_pr_reg_cache;
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}
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t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
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sizeof(struct t10_alua_lu_gp_member),
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__alignof__(struct t10_alua_lu_gp_member), 0, NULL);
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if (!t10_alua_lu_gp_mem_cache) {
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pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
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"cache failed\n");
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goto out_free_lu_gp_cache;
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}
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t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
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sizeof(struct t10_alua_tg_pt_gp),
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__alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
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if (!t10_alua_tg_pt_gp_cache) {
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pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
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"cache failed\n");
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goto out_free_lu_gp_mem_cache;
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}
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t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
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"t10_alua_tg_pt_gp_mem_cache",
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sizeof(struct t10_alua_tg_pt_gp_member),
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__alignof__(struct t10_alua_tg_pt_gp_member),
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0, NULL);
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if (!t10_alua_tg_pt_gp_mem_cache) {
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pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
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"mem_t failed\n");
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goto out_free_tg_pt_gp_cache;
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}
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target_completion_wq = alloc_workqueue("target_completion",
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WQ_MEM_RECLAIM, 0);
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if (!target_completion_wq)
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goto out_free_tg_pt_gp_mem_cache;
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return 0;
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out_free_tg_pt_gp_mem_cache:
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kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
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out_free_tg_pt_gp_cache:
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kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
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out_free_lu_gp_mem_cache:
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kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
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out_free_lu_gp_cache:
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kmem_cache_destroy(t10_alua_lu_gp_cache);
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out_free_pr_reg_cache:
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kmem_cache_destroy(t10_pr_reg_cache);
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out_free_ua_cache:
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kmem_cache_destroy(se_ua_cache);
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out_free_sess_cache:
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kmem_cache_destroy(se_sess_cache);
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out:
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return -ENOMEM;
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}
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void release_se_kmem_caches(void)
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{
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destroy_workqueue(target_completion_wq);
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kmem_cache_destroy(se_sess_cache);
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kmem_cache_destroy(se_ua_cache);
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kmem_cache_destroy(t10_pr_reg_cache);
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kmem_cache_destroy(t10_alua_lu_gp_cache);
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kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
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kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
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kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
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}
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/* This code ensures unique mib indexes are handed out. */
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static DEFINE_SPINLOCK(scsi_mib_index_lock);
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static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
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/*
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* Allocate a new row index for the entry type specified
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*/
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u32 scsi_get_new_index(scsi_index_t type)
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{
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u32 new_index;
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BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
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spin_lock(&scsi_mib_index_lock);
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new_index = ++scsi_mib_index[type];
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spin_unlock(&scsi_mib_index_lock);
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return new_index;
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}
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static void transport_init_queue_obj(struct se_queue_obj *qobj)
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{
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atomic_set(&qobj->queue_cnt, 0);
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INIT_LIST_HEAD(&qobj->qobj_list);
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init_waitqueue_head(&qobj->thread_wq);
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spin_lock_init(&qobj->cmd_queue_lock);
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}
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void transport_subsystem_check_init(void)
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{
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int ret;
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if (sub_api_initialized)
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return;
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ret = request_module("target_core_iblock");
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if (ret != 0)
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pr_err("Unable to load target_core_iblock\n");
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ret = request_module("target_core_file");
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if (ret != 0)
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pr_err("Unable to load target_core_file\n");
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ret = request_module("target_core_pscsi");
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if (ret != 0)
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pr_err("Unable to load target_core_pscsi\n");
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ret = request_module("target_core_stgt");
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if (ret != 0)
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pr_err("Unable to load target_core_stgt\n");
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sub_api_initialized = 1;
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return;
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}
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struct se_session *transport_init_session(void)
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{
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struct se_session *se_sess;
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se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
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if (!se_sess) {
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pr_err("Unable to allocate struct se_session from"
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" se_sess_cache\n");
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return ERR_PTR(-ENOMEM);
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}
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INIT_LIST_HEAD(&se_sess->sess_list);
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INIT_LIST_HEAD(&se_sess->sess_acl_list);
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INIT_LIST_HEAD(&se_sess->sess_cmd_list);
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INIT_LIST_HEAD(&se_sess->sess_wait_list);
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spin_lock_init(&se_sess->sess_cmd_lock);
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kref_init(&se_sess->sess_kref);
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return se_sess;
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}
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EXPORT_SYMBOL(transport_init_session);
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/*
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* Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
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*/
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void __transport_register_session(
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struct se_portal_group *se_tpg,
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struct se_node_acl *se_nacl,
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struct se_session *se_sess,
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void *fabric_sess_ptr)
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{
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unsigned char buf[PR_REG_ISID_LEN];
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se_sess->se_tpg = se_tpg;
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se_sess->fabric_sess_ptr = fabric_sess_ptr;
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/*
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* Used by struct se_node_acl's under ConfigFS to locate active se_session-t
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*
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* Only set for struct se_session's that will actually be moving I/O.
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* eg: *NOT* discovery sessions.
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*/
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if (se_nacl) {
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/*
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* If the fabric module supports an ISID based TransportID,
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* save this value in binary from the fabric I_T Nexus now.
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*/
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if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
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memset(&buf[0], 0, PR_REG_ISID_LEN);
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se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
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&buf[0], PR_REG_ISID_LEN);
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se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
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}
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kref_get(&se_nacl->acl_kref);
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spin_lock_irq(&se_nacl->nacl_sess_lock);
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/*
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* The se_nacl->nacl_sess pointer will be set to the
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* last active I_T Nexus for each struct se_node_acl.
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*/
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se_nacl->nacl_sess = se_sess;
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list_add_tail(&se_sess->sess_acl_list,
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&se_nacl->acl_sess_list);
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spin_unlock_irq(&se_nacl->nacl_sess_lock);
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}
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list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
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pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
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se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
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}
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EXPORT_SYMBOL(__transport_register_session);
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void transport_register_session(
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struct se_portal_group *se_tpg,
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struct se_node_acl *se_nacl,
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struct se_session *se_sess,
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void *fabric_sess_ptr)
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{
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unsigned long flags;
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spin_lock_irqsave(&se_tpg->session_lock, flags);
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__transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
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spin_unlock_irqrestore(&se_tpg->session_lock, flags);
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}
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EXPORT_SYMBOL(transport_register_session);
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static void target_release_session(struct kref *kref)
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{
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struct se_session *se_sess = container_of(kref,
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struct se_session, sess_kref);
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struct se_portal_group *se_tpg = se_sess->se_tpg;
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se_tpg->se_tpg_tfo->close_session(se_sess);
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}
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void target_get_session(struct se_session *se_sess)
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{
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kref_get(&se_sess->sess_kref);
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}
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EXPORT_SYMBOL(target_get_session);
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int target_put_session(struct se_session *se_sess)
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{
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return kref_put(&se_sess->sess_kref, target_release_session);
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}
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EXPORT_SYMBOL(target_put_session);
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static void target_complete_nacl(struct kref *kref)
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{
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struct se_node_acl *nacl = container_of(kref,
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struct se_node_acl, acl_kref);
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complete(&nacl->acl_free_comp);
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}
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void target_put_nacl(struct se_node_acl *nacl)
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{
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kref_put(&nacl->acl_kref, target_complete_nacl);
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}
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void transport_deregister_session_configfs(struct se_session *se_sess)
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{
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struct se_node_acl *se_nacl;
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unsigned long flags;
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/*
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* Used by struct se_node_acl's under ConfigFS to locate active struct se_session
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*/
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se_nacl = se_sess->se_node_acl;
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if (se_nacl) {
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spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
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if (se_nacl->acl_stop == 0)
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list_del(&se_sess->sess_acl_list);
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/*
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* If the session list is empty, then clear the pointer.
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* Otherwise, set the struct se_session pointer from the tail
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* element of the per struct se_node_acl active session list.
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*/
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if (list_empty(&se_nacl->acl_sess_list))
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se_nacl->nacl_sess = NULL;
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else {
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se_nacl->nacl_sess = container_of(
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se_nacl->acl_sess_list.prev,
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struct se_session, sess_acl_list);
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}
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spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
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}
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}
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EXPORT_SYMBOL(transport_deregister_session_configfs);
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void transport_free_session(struct se_session *se_sess)
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{
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kmem_cache_free(se_sess_cache, se_sess);
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}
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EXPORT_SYMBOL(transport_free_session);
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void transport_deregister_session(struct se_session *se_sess)
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{
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struct se_portal_group *se_tpg = se_sess->se_tpg;
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struct target_core_fabric_ops *se_tfo;
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struct se_node_acl *se_nacl;
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unsigned long flags;
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bool comp_nacl = true;
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if (!se_tpg) {
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transport_free_session(se_sess);
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return;
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}
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se_tfo = se_tpg->se_tpg_tfo;
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spin_lock_irqsave(&se_tpg->session_lock, flags);
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list_del(&se_sess->sess_list);
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se_sess->se_tpg = NULL;
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se_sess->fabric_sess_ptr = NULL;
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spin_unlock_irqrestore(&se_tpg->session_lock, flags);
|
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|
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/*
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* Determine if we need to do extra work for this initiator node's
|
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* struct se_node_acl if it had been previously dynamically generated.
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*/
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se_nacl = se_sess->se_node_acl;
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|
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spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
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if (se_nacl && se_nacl->dynamic_node_acl) {
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if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
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list_del(&se_nacl->acl_list);
|
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se_tpg->num_node_acls--;
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spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
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core_tpg_wait_for_nacl_pr_ref(se_nacl);
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core_free_device_list_for_node(se_nacl, se_tpg);
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se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
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|
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comp_nacl = false;
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spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
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}
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}
|
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spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
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|
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pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
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se_tpg->se_tpg_tfo->get_fabric_name());
|
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/*
|
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* If last kref is dropping now for an explict NodeACL, awake sleeping
|
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* ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
|
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* removal context.
|
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*/
|
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if (se_nacl && comp_nacl == true)
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target_put_nacl(se_nacl);
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|
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transport_free_session(se_sess);
|
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}
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EXPORT_SYMBOL(transport_deregister_session);
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|
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/*
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* Called with cmd->t_state_lock held.
|
|
*/
|
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static void transport_all_task_dev_remove_state(struct se_cmd *cmd)
|
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{
|
|
struct se_device *dev = cmd->se_dev;
|
|
struct se_task *task;
|
|
unsigned long flags;
|
|
|
|
if (!dev)
|
|
return;
|
|
|
|
list_for_each_entry(task, &cmd->t_task_list, t_list) {
|
|
if (task->task_flags & TF_ACTIVE)
|
|
continue;
|
|
|
|
spin_lock_irqsave(&dev->execute_task_lock, flags);
|
|
if (task->t_state_active) {
|
|
pr_debug("Removed ITT: 0x%08x dev: %p task[%p]\n",
|
|
cmd->se_tfo->get_task_tag(cmd), dev, task);
|
|
|
|
list_del(&task->t_state_list);
|
|
atomic_dec(&cmd->t_task_cdbs_ex_left);
|
|
task->t_state_active = false;
|
|
}
|
|
spin_unlock_irqrestore(&dev->execute_task_lock, flags);
|
|
}
|
|
|
|
}
|
|
|
|
/* transport_cmd_check_stop():
|
|
*
|
|
* 'transport_off = 1' determines if CMD_T_ACTIVE should be cleared.
|
|
* 'transport_off = 2' determines if task_dev_state should be removed.
|
|
*
|
|
* A non-zero u8 t_state sets cmd->t_state.
|
|
* Returns 1 when command is stopped, else 0.
|
|
*/
|
|
static int transport_cmd_check_stop(
|
|
struct se_cmd *cmd,
|
|
int transport_off,
|
|
u8 t_state)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&cmd->t_state_lock, flags);
|
|
/*
|
|
* Determine if IOCTL context caller in requesting the stopping of this
|
|
* command for LUN shutdown purposes.
|
|
*/
|
|
if (cmd->transport_state & CMD_T_LUN_STOP) {
|
|
pr_debug("%s:%d CMD_T_LUN_STOP for ITT: 0x%08x\n",
|
|
__func__, __LINE__, cmd->se_tfo->get_task_tag(cmd));
|
|
|
|
cmd->transport_state &= ~CMD_T_ACTIVE;
|
|
if (transport_off == 2)
|
|
transport_all_task_dev_remove_state(cmd);
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
|
|
complete(&cmd->transport_lun_stop_comp);
|
|
return 1;
|
|
}
|
|
/*
|
|
* Determine if frontend context caller is requesting the stopping of
|
|
* this command for frontend exceptions.
|
|
*/
|
|
if (cmd->transport_state & CMD_T_STOP) {
|
|
pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
|
|
__func__, __LINE__,
|
|
cmd->se_tfo->get_task_tag(cmd));
|
|
|
|
if (transport_off == 2)
|
|
transport_all_task_dev_remove_state(cmd);
|
|
|
|
/*
|
|
* Clear struct se_cmd->se_lun before the transport_off == 2 handoff
|
|
* to FE.
|
|
*/
|
|
if (transport_off == 2)
|
|
cmd->se_lun = NULL;
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
|
|
complete(&cmd->t_transport_stop_comp);
|
|
return 1;
|
|
}
|
|
if (transport_off) {
|
|
cmd->transport_state &= ~CMD_T_ACTIVE;
|
|
if (transport_off == 2) {
|
|
transport_all_task_dev_remove_state(cmd);
|
|
/*
|
|
* Clear struct se_cmd->se_lun before the transport_off == 2
|
|
* handoff to fabric module.
|
|
*/
|
|
cmd->se_lun = NULL;
|
|
/*
|
|
* Some fabric modules like tcm_loop can release
|
|
* their internally allocated I/O reference now and
|
|
* struct se_cmd now.
|
|
*
|
|
* Fabric modules are expected to return '1' here if the
|
|
* se_cmd being passed is released at this point,
|
|
* or zero if not being released.
|
|
*/
|
|
if (cmd->se_tfo->check_stop_free != NULL) {
|
|
spin_unlock_irqrestore(
|
|
&cmd->t_state_lock, flags);
|
|
|
|
return cmd->se_tfo->check_stop_free(cmd);
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
|
|
return 0;
|
|
} else if (t_state)
|
|
cmd->t_state = t_state;
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
|
|
{
|
|
return transport_cmd_check_stop(cmd, 2, 0);
|
|
}
|
|
|
|
static void transport_lun_remove_cmd(struct se_cmd *cmd)
|
|
{
|
|
struct se_lun *lun = cmd->se_lun;
|
|
unsigned long flags;
|
|
|
|
if (!lun)
|
|
return;
|
|
|
|
spin_lock_irqsave(&cmd->t_state_lock, flags);
|
|
if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
|
|
cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
|
|
transport_all_task_dev_remove_state(cmd);
|
|
}
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
|
|
spin_lock_irqsave(&lun->lun_cmd_lock, flags);
|
|
if (!list_empty(&cmd->se_lun_node))
|
|
list_del_init(&cmd->se_lun_node);
|
|
spin_unlock_irqrestore(&lun->lun_cmd_lock, flags);
|
|
}
|
|
|
|
void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
|
|
{
|
|
if (!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
|
|
transport_lun_remove_cmd(cmd);
|
|
|
|
if (transport_cmd_check_stop_to_fabric(cmd))
|
|
return;
|
|
if (remove) {
|
|
transport_remove_cmd_from_queue(cmd);
|
|
transport_put_cmd(cmd);
|
|
}
|
|
}
|
|
|
|
static void transport_add_cmd_to_queue(struct se_cmd *cmd, int t_state,
|
|
bool at_head)
|
|
{
|
|
struct se_device *dev = cmd->se_dev;
|
|
struct se_queue_obj *qobj = &dev->dev_queue_obj;
|
|
unsigned long flags;
|
|
|
|
if (t_state) {
|
|
spin_lock_irqsave(&cmd->t_state_lock, flags);
|
|
cmd->t_state = t_state;
|
|
cmd->transport_state |= CMD_T_ACTIVE;
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
}
|
|
|
|
spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
|
|
|
|
/* If the cmd is already on the list, remove it before we add it */
|
|
if (!list_empty(&cmd->se_queue_node))
|
|
list_del(&cmd->se_queue_node);
|
|
else
|
|
atomic_inc(&qobj->queue_cnt);
|
|
|
|
if (at_head)
|
|
list_add(&cmd->se_queue_node, &qobj->qobj_list);
|
|
else
|
|
list_add_tail(&cmd->se_queue_node, &qobj->qobj_list);
|
|
cmd->transport_state |= CMD_T_QUEUED;
|
|
spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
|
|
|
|
wake_up_interruptible(&qobj->thread_wq);
|
|
}
|
|
|
|
static struct se_cmd *
|
|
transport_get_cmd_from_queue(struct se_queue_obj *qobj)
|
|
{
|
|
struct se_cmd *cmd;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
|
|
if (list_empty(&qobj->qobj_list)) {
|
|
spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
|
|
return NULL;
|
|
}
|
|
cmd = list_first_entry(&qobj->qobj_list, struct se_cmd, se_queue_node);
|
|
|
|
cmd->transport_state &= ~CMD_T_QUEUED;
|
|
list_del_init(&cmd->se_queue_node);
|
|
atomic_dec(&qobj->queue_cnt);
|
|
spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
|
|
|
|
return cmd;
|
|
}
|
|
|
|
static void transport_remove_cmd_from_queue(struct se_cmd *cmd)
|
|
{
|
|
struct se_queue_obj *qobj = &cmd->se_dev->dev_queue_obj;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
|
|
if (!(cmd->transport_state & CMD_T_QUEUED)) {
|
|
spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
|
|
return;
|
|
}
|
|
cmd->transport_state &= ~CMD_T_QUEUED;
|
|
atomic_dec(&qobj->queue_cnt);
|
|
list_del_init(&cmd->se_queue_node);
|
|
spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* Completion function used by TCM subsystem plugins (such as FILEIO)
|
|
* for queueing up response from struct se_subsystem_api->do_task()
|
|
*/
|
|
void transport_complete_sync_cache(struct se_cmd *cmd, int good)
|
|
{
|
|
struct se_task *task = list_entry(cmd->t_task_list.next,
|
|
struct se_task, t_list);
|
|
|
|
if (good) {
|
|
cmd->scsi_status = SAM_STAT_GOOD;
|
|
task->task_scsi_status = GOOD;
|
|
} else {
|
|
task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
|
|
task->task_se_cmd->scsi_sense_reason =
|
|
TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
|
|
}
|
|
|
|
transport_complete_task(task, good);
|
|
}
|
|
EXPORT_SYMBOL(transport_complete_sync_cache);
|
|
|
|
static void target_complete_failure_work(struct work_struct *work)
|
|
{
|
|
struct se_cmd *cmd = container_of(work, struct se_cmd, work);
|
|
|
|
transport_generic_request_failure(cmd);
|
|
}
|
|
|
|
/* transport_complete_task():
|
|
*
|
|
* Called from interrupt and non interrupt context depending
|
|
* on the transport plugin.
|
|
*/
|
|
void transport_complete_task(struct se_task *task, int success)
|
|
{
|
|
struct se_cmd *cmd = task->task_se_cmd;
|
|
struct se_device *dev = cmd->se_dev;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&cmd->t_state_lock, flags);
|
|
task->task_flags &= ~TF_ACTIVE;
|
|
|
|
/*
|
|
* See if any sense data exists, if so set the TASK_SENSE flag.
|
|
* Also check for any other post completion work that needs to be
|
|
* done by the plugins.
|
|
*/
|
|
if (dev && dev->transport->transport_complete) {
|
|
if (dev->transport->transport_complete(task) != 0) {
|
|
cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
|
|
task->task_flags |= TF_HAS_SENSE;
|
|
success = 1;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* See if we are waiting for outstanding struct se_task
|
|
* to complete for an exception condition
|
|
*/
|
|
if (task->task_flags & TF_REQUEST_STOP) {
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
complete(&task->task_stop_comp);
|
|
return;
|
|
}
|
|
|
|
if (!success)
|
|
cmd->transport_state |= CMD_T_FAILED;
|
|
|
|
/*
|
|
* Decrement the outstanding t_task_cdbs_left count. The last
|
|
* struct se_task from struct se_cmd will complete itself into the
|
|
* device queue depending upon int success.
|
|
*/
|
|
if (!atomic_dec_and_test(&cmd->t_task_cdbs_left)) {
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
return;
|
|
}
|
|
/*
|
|
* Check for case where an explict ABORT_TASK has been received
|
|
* and transport_wait_for_tasks() will be waiting for completion..
|
|
*/
|
|
if (cmd->transport_state & CMD_T_ABORTED &&
|
|
cmd->transport_state & CMD_T_STOP) {
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
complete(&cmd->t_transport_stop_comp);
|
|
return;
|
|
} else if (cmd->transport_state & CMD_T_FAILED) {
|
|
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
INIT_WORK(&cmd->work, target_complete_failure_work);
|
|
} else {
|
|
INIT_WORK(&cmd->work, target_complete_ok_work);
|
|
}
|
|
|
|
cmd->t_state = TRANSPORT_COMPLETE;
|
|
cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
|
|
queue_work(target_completion_wq, &cmd->work);
|
|
}
|
|
EXPORT_SYMBOL(transport_complete_task);
|
|
|
|
/*
|
|
* Called by transport_add_tasks_from_cmd() once a struct se_cmd's
|
|
* struct se_task list are ready to be added to the active execution list
|
|
* struct se_device
|
|
|
|
* Called with se_dev_t->execute_task_lock called.
|
|
*/
|
|
static inline int transport_add_task_check_sam_attr(
|
|
struct se_task *task,
|
|
struct se_task *task_prev,
|
|
struct se_device *dev)
|
|
{
|
|
/*
|
|
* No SAM Task attribute emulation enabled, add to tail of
|
|
* execution queue
|
|
*/
|
|
if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) {
|
|
list_add_tail(&task->t_execute_list, &dev->execute_task_list);
|
|
return 0;
|
|
}
|
|
/*
|
|
* HEAD_OF_QUEUE attribute for received CDB, which means
|
|
* the first task that is associated with a struct se_cmd goes to
|
|
* head of the struct se_device->execute_task_list, and task_prev
|
|
* after that for each subsequent task
|
|
*/
|
|
if (task->task_se_cmd->sam_task_attr == MSG_HEAD_TAG) {
|
|
list_add(&task->t_execute_list,
|
|
(task_prev != NULL) ?
|
|
&task_prev->t_execute_list :
|
|
&dev->execute_task_list);
|
|
|
|
pr_debug("Set HEAD_OF_QUEUE for task CDB: 0x%02x"
|
|
" in execution queue\n",
|
|
task->task_se_cmd->t_task_cdb[0]);
|
|
return 1;
|
|
}
|
|
/*
|
|
* For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been
|
|
* transitioned from Dermant -> Active state, and are added to the end
|
|
* of the struct se_device->execute_task_list
|
|
*/
|
|
list_add_tail(&task->t_execute_list, &dev->execute_task_list);
|
|
return 0;
|
|
}
|
|
|
|
/* __transport_add_task_to_execute_queue():
|
|
*
|
|
* Called with se_dev_t->execute_task_lock called.
|
|
*/
|
|
static void __transport_add_task_to_execute_queue(
|
|
struct se_task *task,
|
|
struct se_task *task_prev,
|
|
struct se_device *dev)
|
|
{
|
|
int head_of_queue;
|
|
|
|
head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev);
|
|
atomic_inc(&dev->execute_tasks);
|
|
|
|
if (task->t_state_active)
|
|
return;
|
|
/*
|
|
* Determine if this task needs to go to HEAD_OF_QUEUE for the
|
|
* state list as well. Running with SAM Task Attribute emulation
|
|
* will always return head_of_queue == 0 here
|
|
*/
|
|
if (head_of_queue)
|
|
list_add(&task->t_state_list, (task_prev) ?
|
|
&task_prev->t_state_list :
|
|
&dev->state_task_list);
|
|
else
|
|
list_add_tail(&task->t_state_list, &dev->state_task_list);
|
|
|
|
task->t_state_active = true;
|
|
|
|
pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
|
|
task->task_se_cmd->se_tfo->get_task_tag(task->task_se_cmd),
|
|
task, dev);
|
|
}
|
|
|
|
static void transport_add_tasks_to_state_queue(struct se_cmd *cmd)
|
|
{
|
|
struct se_device *dev = cmd->se_dev;
|
|
struct se_task *task;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&cmd->t_state_lock, flags);
|
|
list_for_each_entry(task, &cmd->t_task_list, t_list) {
|
|
spin_lock(&dev->execute_task_lock);
|
|
if (!task->t_state_active) {
|
|
list_add_tail(&task->t_state_list,
|
|
&dev->state_task_list);
|
|
task->t_state_active = true;
|
|
|
|
pr_debug("Added ITT: 0x%08x task[%p] to dev: %p\n",
|
|
task->task_se_cmd->se_tfo->get_task_tag(
|
|
task->task_se_cmd), task, dev);
|
|
}
|
|
spin_unlock(&dev->execute_task_lock);
|
|
}
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
}
|
|
|
|
static void __transport_add_tasks_from_cmd(struct se_cmd *cmd)
|
|
{
|
|
struct se_device *dev = cmd->se_dev;
|
|
struct se_task *task, *task_prev = NULL;
|
|
|
|
list_for_each_entry(task, &cmd->t_task_list, t_list) {
|
|
if (!list_empty(&task->t_execute_list))
|
|
continue;
|
|
/*
|
|
* __transport_add_task_to_execute_queue() handles the
|
|
* SAM Task Attribute emulation if enabled
|
|
*/
|
|
__transport_add_task_to_execute_queue(task, task_prev, dev);
|
|
task_prev = task;
|
|
}
|
|
}
|
|
|
|
static void transport_add_tasks_from_cmd(struct se_cmd *cmd)
|
|
{
|
|
unsigned long flags;
|
|
struct se_device *dev = cmd->se_dev;
|
|
|
|
spin_lock_irqsave(&dev->execute_task_lock, flags);
|
|
__transport_add_tasks_from_cmd(cmd);
|
|
spin_unlock_irqrestore(&dev->execute_task_lock, flags);
|
|
}
|
|
|
|
void __transport_remove_task_from_execute_queue(struct se_task *task,
|
|
struct se_device *dev)
|
|
{
|
|
list_del_init(&task->t_execute_list);
|
|
atomic_dec(&dev->execute_tasks);
|
|
}
|
|
|
|
static void transport_remove_task_from_execute_queue(
|
|
struct se_task *task,
|
|
struct se_device *dev)
|
|
{
|
|
unsigned long flags;
|
|
|
|
if (WARN_ON(list_empty(&task->t_execute_list)))
|
|
return;
|
|
|
|
spin_lock_irqsave(&dev->execute_task_lock, flags);
|
|
__transport_remove_task_from_execute_queue(task, dev);
|
|
spin_unlock_irqrestore(&dev->execute_task_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
|
|
*/
|
|
|
|
static void target_qf_do_work(struct work_struct *work)
|
|
{
|
|
struct se_device *dev = container_of(work, struct se_device,
|
|
qf_work_queue);
|
|
LIST_HEAD(qf_cmd_list);
|
|
struct se_cmd *cmd, *cmd_tmp;
|
|
|
|
spin_lock_irq(&dev->qf_cmd_lock);
|
|
list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
|
|
spin_unlock_irq(&dev->qf_cmd_lock);
|
|
|
|
list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
|
|
list_del(&cmd->se_qf_node);
|
|
atomic_dec(&dev->dev_qf_count);
|
|
smp_mb__after_atomic_dec();
|
|
|
|
pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
|
|
" context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
|
|
(cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
|
|
(cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
|
|
: "UNKNOWN");
|
|
|
|
transport_add_cmd_to_queue(cmd, cmd->t_state, true);
|
|
}
|
|
}
|
|
|
|
unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
|
|
{
|
|
switch (cmd->data_direction) {
|
|
case DMA_NONE:
|
|
return "NONE";
|
|
case DMA_FROM_DEVICE:
|
|
return "READ";
|
|
case DMA_TO_DEVICE:
|
|
return "WRITE";
|
|
case DMA_BIDIRECTIONAL:
|
|
return "BIDI";
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return "UNKNOWN";
|
|
}
|
|
|
|
void transport_dump_dev_state(
|
|
struct se_device *dev,
|
|
char *b,
|
|
int *bl)
|
|
{
|
|
*bl += sprintf(b + *bl, "Status: ");
|
|
switch (dev->dev_status) {
|
|
case TRANSPORT_DEVICE_ACTIVATED:
|
|
*bl += sprintf(b + *bl, "ACTIVATED");
|
|
break;
|
|
case TRANSPORT_DEVICE_DEACTIVATED:
|
|
*bl += sprintf(b + *bl, "DEACTIVATED");
|
|
break;
|
|
case TRANSPORT_DEVICE_SHUTDOWN:
|
|
*bl += sprintf(b + *bl, "SHUTDOWN");
|
|
break;
|
|
case TRANSPORT_DEVICE_OFFLINE_ACTIVATED:
|
|
case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED:
|
|
*bl += sprintf(b + *bl, "OFFLINE");
|
|
break;
|
|
default:
|
|
*bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status);
|
|
break;
|
|
}
|
|
|
|
*bl += sprintf(b + *bl, " Execute/Max Queue Depth: %d/%d",
|
|
atomic_read(&dev->execute_tasks), dev->queue_depth);
|
|
*bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n",
|
|
dev->se_sub_dev->se_dev_attrib.block_size, dev->se_sub_dev->se_dev_attrib.max_sectors);
|
|
*bl += sprintf(b + *bl, " ");
|
|
}
|
|
|
|
void transport_dump_vpd_proto_id(
|
|
struct t10_vpd *vpd,
|
|
unsigned char *p_buf,
|
|
int p_buf_len)
|
|
{
|
|
unsigned char buf[VPD_TMP_BUF_SIZE];
|
|
int len;
|
|
|
|
memset(buf, 0, VPD_TMP_BUF_SIZE);
|
|
len = sprintf(buf, "T10 VPD Protocol Identifier: ");
|
|
|
|
switch (vpd->protocol_identifier) {
|
|
case 0x00:
|
|
sprintf(buf+len, "Fibre Channel\n");
|
|
break;
|
|
case 0x10:
|
|
sprintf(buf+len, "Parallel SCSI\n");
|
|
break;
|
|
case 0x20:
|
|
sprintf(buf+len, "SSA\n");
|
|
break;
|
|
case 0x30:
|
|
sprintf(buf+len, "IEEE 1394\n");
|
|
break;
|
|
case 0x40:
|
|
sprintf(buf+len, "SCSI Remote Direct Memory Access"
|
|
" Protocol\n");
|
|
break;
|
|
case 0x50:
|
|
sprintf(buf+len, "Internet SCSI (iSCSI)\n");
|
|
break;
|
|
case 0x60:
|
|
sprintf(buf+len, "SAS Serial SCSI Protocol\n");
|
|
break;
|
|
case 0x70:
|
|
sprintf(buf+len, "Automation/Drive Interface Transport"
|
|
" Protocol\n");
|
|
break;
|
|
case 0x80:
|
|
sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
|
|
break;
|
|
default:
|
|
sprintf(buf+len, "Unknown 0x%02x\n",
|
|
vpd->protocol_identifier);
|
|
break;
|
|
}
|
|
|
|
if (p_buf)
|
|
strncpy(p_buf, buf, p_buf_len);
|
|
else
|
|
pr_debug("%s", buf);
|
|
}
|
|
|
|
void
|
|
transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
|
|
{
|
|
/*
|
|
* Check if the Protocol Identifier Valid (PIV) bit is set..
|
|
*
|
|
* from spc3r23.pdf section 7.5.1
|
|
*/
|
|
if (page_83[1] & 0x80) {
|
|
vpd->protocol_identifier = (page_83[0] & 0xf0);
|
|
vpd->protocol_identifier_set = 1;
|
|
transport_dump_vpd_proto_id(vpd, NULL, 0);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(transport_set_vpd_proto_id);
|
|
|
|
int transport_dump_vpd_assoc(
|
|
struct t10_vpd *vpd,
|
|
unsigned char *p_buf,
|
|
int p_buf_len)
|
|
{
|
|
unsigned char buf[VPD_TMP_BUF_SIZE];
|
|
int ret = 0;
|
|
int len;
|
|
|
|
memset(buf, 0, VPD_TMP_BUF_SIZE);
|
|
len = sprintf(buf, "T10 VPD Identifier Association: ");
|
|
|
|
switch (vpd->association) {
|
|
case 0x00:
|
|
sprintf(buf+len, "addressed logical unit\n");
|
|
break;
|
|
case 0x10:
|
|
sprintf(buf+len, "target port\n");
|
|
break;
|
|
case 0x20:
|
|
sprintf(buf+len, "SCSI target device\n");
|
|
break;
|
|
default:
|
|
sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
if (p_buf)
|
|
strncpy(p_buf, buf, p_buf_len);
|
|
else
|
|
pr_debug("%s", buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
|
|
{
|
|
/*
|
|
* The VPD identification association..
|
|
*
|
|
* from spc3r23.pdf Section 7.6.3.1 Table 297
|
|
*/
|
|
vpd->association = (page_83[1] & 0x30);
|
|
return transport_dump_vpd_assoc(vpd, NULL, 0);
|
|
}
|
|
EXPORT_SYMBOL(transport_set_vpd_assoc);
|
|
|
|
int transport_dump_vpd_ident_type(
|
|
struct t10_vpd *vpd,
|
|
unsigned char *p_buf,
|
|
int p_buf_len)
|
|
{
|
|
unsigned char buf[VPD_TMP_BUF_SIZE];
|
|
int ret = 0;
|
|
int len;
|
|
|
|
memset(buf, 0, VPD_TMP_BUF_SIZE);
|
|
len = sprintf(buf, "T10 VPD Identifier Type: ");
|
|
|
|
switch (vpd->device_identifier_type) {
|
|
case 0x00:
|
|
sprintf(buf+len, "Vendor specific\n");
|
|
break;
|
|
case 0x01:
|
|
sprintf(buf+len, "T10 Vendor ID based\n");
|
|
break;
|
|
case 0x02:
|
|
sprintf(buf+len, "EUI-64 based\n");
|
|
break;
|
|
case 0x03:
|
|
sprintf(buf+len, "NAA\n");
|
|
break;
|
|
case 0x04:
|
|
sprintf(buf+len, "Relative target port identifier\n");
|
|
break;
|
|
case 0x08:
|
|
sprintf(buf+len, "SCSI name string\n");
|
|
break;
|
|
default:
|
|
sprintf(buf+len, "Unsupported: 0x%02x\n",
|
|
vpd->device_identifier_type);
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
if (p_buf) {
|
|
if (p_buf_len < strlen(buf)+1)
|
|
return -EINVAL;
|
|
strncpy(p_buf, buf, p_buf_len);
|
|
} else {
|
|
pr_debug("%s", buf);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
|
|
{
|
|
/*
|
|
* The VPD identifier type..
|
|
*
|
|
* from spc3r23.pdf Section 7.6.3.1 Table 298
|
|
*/
|
|
vpd->device_identifier_type = (page_83[1] & 0x0f);
|
|
return transport_dump_vpd_ident_type(vpd, NULL, 0);
|
|
}
|
|
EXPORT_SYMBOL(transport_set_vpd_ident_type);
|
|
|
|
int transport_dump_vpd_ident(
|
|
struct t10_vpd *vpd,
|
|
unsigned char *p_buf,
|
|
int p_buf_len)
|
|
{
|
|
unsigned char buf[VPD_TMP_BUF_SIZE];
|
|
int ret = 0;
|
|
|
|
memset(buf, 0, VPD_TMP_BUF_SIZE);
|
|
|
|
switch (vpd->device_identifier_code_set) {
|
|
case 0x01: /* Binary */
|
|
sprintf(buf, "T10 VPD Binary Device Identifier: %s\n",
|
|
&vpd->device_identifier[0]);
|
|
break;
|
|
case 0x02: /* ASCII */
|
|
sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n",
|
|
&vpd->device_identifier[0]);
|
|
break;
|
|
case 0x03: /* UTF-8 */
|
|
sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n",
|
|
&vpd->device_identifier[0]);
|
|
break;
|
|
default:
|
|
sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
|
|
" 0x%02x", vpd->device_identifier_code_set);
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
if (p_buf)
|
|
strncpy(p_buf, buf, p_buf_len);
|
|
else
|
|
pr_debug("%s", buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int
|
|
transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
|
|
{
|
|
static const char hex_str[] = "0123456789abcdef";
|
|
int j = 0, i = 4; /* offset to start of the identifer */
|
|
|
|
/*
|
|
* The VPD Code Set (encoding)
|
|
*
|
|
* from spc3r23.pdf Section 7.6.3.1 Table 296
|
|
*/
|
|
vpd->device_identifier_code_set = (page_83[0] & 0x0f);
|
|
switch (vpd->device_identifier_code_set) {
|
|
case 0x01: /* Binary */
|
|
vpd->device_identifier[j++] =
|
|
hex_str[vpd->device_identifier_type];
|
|
while (i < (4 + page_83[3])) {
|
|
vpd->device_identifier[j++] =
|
|
hex_str[(page_83[i] & 0xf0) >> 4];
|
|
vpd->device_identifier[j++] =
|
|
hex_str[page_83[i] & 0x0f];
|
|
i++;
|
|
}
|
|
break;
|
|
case 0x02: /* ASCII */
|
|
case 0x03: /* UTF-8 */
|
|
while (i < (4 + page_83[3]))
|
|
vpd->device_identifier[j++] = page_83[i++];
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return transport_dump_vpd_ident(vpd, NULL, 0);
|
|
}
|
|
EXPORT_SYMBOL(transport_set_vpd_ident);
|
|
|
|
static void core_setup_task_attr_emulation(struct se_device *dev)
|
|
{
|
|
/*
|
|
* If this device is from Target_Core_Mod/pSCSI, disable the
|
|
* SAM Task Attribute emulation.
|
|
*
|
|
* This is currently not available in upsream Linux/SCSI Target
|
|
* mode code, and is assumed to be disabled while using TCM/pSCSI.
|
|
*/
|
|
if (dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) {
|
|
dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH;
|
|
return;
|
|
}
|
|
|
|
dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED;
|
|
pr_debug("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x"
|
|
" device\n", dev->transport->name,
|
|
dev->transport->get_device_rev(dev));
|
|
}
|
|
|
|
static void scsi_dump_inquiry(struct se_device *dev)
|
|
{
|
|
struct t10_wwn *wwn = &dev->se_sub_dev->t10_wwn;
|
|
char buf[17];
|
|
int i, device_type;
|
|
/*
|
|
* Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer
|
|
*/
|
|
for (i = 0; i < 8; i++)
|
|
if (wwn->vendor[i] >= 0x20)
|
|
buf[i] = wwn->vendor[i];
|
|
else
|
|
buf[i] = ' ';
|
|
buf[i] = '\0';
|
|
pr_debug(" Vendor: %s\n", buf);
|
|
|
|
for (i = 0; i < 16; i++)
|
|
if (wwn->model[i] >= 0x20)
|
|
buf[i] = wwn->model[i];
|
|
else
|
|
buf[i] = ' ';
|
|
buf[i] = '\0';
|
|
pr_debug(" Model: %s\n", buf);
|
|
|
|
for (i = 0; i < 4; i++)
|
|
if (wwn->revision[i] >= 0x20)
|
|
buf[i] = wwn->revision[i];
|
|
else
|
|
buf[i] = ' ';
|
|
buf[i] = '\0';
|
|
pr_debug(" Revision: %s\n", buf);
|
|
|
|
device_type = dev->transport->get_device_type(dev);
|
|
pr_debug(" Type: %s ", scsi_device_type(device_type));
|
|
pr_debug(" ANSI SCSI revision: %02x\n",
|
|
dev->transport->get_device_rev(dev));
|
|
}
|
|
|
|
struct se_device *transport_add_device_to_core_hba(
|
|
struct se_hba *hba,
|
|
struct se_subsystem_api *transport,
|
|
struct se_subsystem_dev *se_dev,
|
|
u32 device_flags,
|
|
void *transport_dev,
|
|
struct se_dev_limits *dev_limits,
|
|
const char *inquiry_prod,
|
|
const char *inquiry_rev)
|
|
{
|
|
int force_pt;
|
|
struct se_device *dev;
|
|
|
|
dev = kzalloc(sizeof(struct se_device), GFP_KERNEL);
|
|
if (!dev) {
|
|
pr_err("Unable to allocate memory for se_dev_t\n");
|
|
return NULL;
|
|
}
|
|
|
|
transport_init_queue_obj(&dev->dev_queue_obj);
|
|
dev->dev_flags = device_flags;
|
|
dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED;
|
|
dev->dev_ptr = transport_dev;
|
|
dev->se_hba = hba;
|
|
dev->se_sub_dev = se_dev;
|
|
dev->transport = transport;
|
|
INIT_LIST_HEAD(&dev->dev_list);
|
|
INIT_LIST_HEAD(&dev->dev_sep_list);
|
|
INIT_LIST_HEAD(&dev->dev_tmr_list);
|
|
INIT_LIST_HEAD(&dev->execute_task_list);
|
|
INIT_LIST_HEAD(&dev->delayed_cmd_list);
|
|
INIT_LIST_HEAD(&dev->state_task_list);
|
|
INIT_LIST_HEAD(&dev->qf_cmd_list);
|
|
spin_lock_init(&dev->execute_task_lock);
|
|
spin_lock_init(&dev->delayed_cmd_lock);
|
|
spin_lock_init(&dev->dev_reservation_lock);
|
|
spin_lock_init(&dev->dev_status_lock);
|
|
spin_lock_init(&dev->se_port_lock);
|
|
spin_lock_init(&dev->se_tmr_lock);
|
|
spin_lock_init(&dev->qf_cmd_lock);
|
|
atomic_set(&dev->dev_ordered_id, 0);
|
|
|
|
se_dev_set_default_attribs(dev, dev_limits);
|
|
|
|
dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX);
|
|
dev->creation_time = get_jiffies_64();
|
|
spin_lock_init(&dev->stats_lock);
|
|
|
|
spin_lock(&hba->device_lock);
|
|
list_add_tail(&dev->dev_list, &hba->hba_dev_list);
|
|
hba->dev_count++;
|
|
spin_unlock(&hba->device_lock);
|
|
/*
|
|
* Setup the SAM Task Attribute emulation for struct se_device
|
|
*/
|
|
core_setup_task_attr_emulation(dev);
|
|
/*
|
|
* Force PR and ALUA passthrough emulation with internal object use.
|
|
*/
|
|
force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE);
|
|
/*
|
|
* Setup the Reservations infrastructure for struct se_device
|
|
*/
|
|
core_setup_reservations(dev, force_pt);
|
|
/*
|
|
* Setup the Asymmetric Logical Unit Assignment for struct se_device
|
|
*/
|
|
if (core_setup_alua(dev, force_pt) < 0)
|
|
goto out;
|
|
|
|
/*
|
|
* Startup the struct se_device processing thread
|
|
*/
|
|
dev->process_thread = kthread_run(transport_processing_thread, dev,
|
|
"LIO_%s", dev->transport->name);
|
|
if (IS_ERR(dev->process_thread)) {
|
|
pr_err("Unable to create kthread: LIO_%s\n",
|
|
dev->transport->name);
|
|
goto out;
|
|
}
|
|
/*
|
|
* Setup work_queue for QUEUE_FULL
|
|
*/
|
|
INIT_WORK(&dev->qf_work_queue, target_qf_do_work);
|
|
/*
|
|
* Preload the initial INQUIRY const values if we are doing
|
|
* anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI
|
|
* passthrough because this is being provided by the backend LLD.
|
|
* This is required so that transport_get_inquiry() copies these
|
|
* originals once back into DEV_T10_WWN(dev) for the virtual device
|
|
* setup.
|
|
*/
|
|
if (dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
|
|
if (!inquiry_prod || !inquiry_rev) {
|
|
pr_err("All non TCM/pSCSI plugins require"
|
|
" INQUIRY consts\n");
|
|
goto out;
|
|
}
|
|
|
|
strncpy(&dev->se_sub_dev->t10_wwn.vendor[0], "LIO-ORG", 8);
|
|
strncpy(&dev->se_sub_dev->t10_wwn.model[0], inquiry_prod, 16);
|
|
strncpy(&dev->se_sub_dev->t10_wwn.revision[0], inquiry_rev, 4);
|
|
}
|
|
scsi_dump_inquiry(dev);
|
|
|
|
return dev;
|
|
out:
|
|
kthread_stop(dev->process_thread);
|
|
|
|
spin_lock(&hba->device_lock);
|
|
list_del(&dev->dev_list);
|
|
hba->dev_count--;
|
|
spin_unlock(&hba->device_lock);
|
|
|
|
se_release_vpd_for_dev(dev);
|
|
|
|
kfree(dev);
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(transport_add_device_to_core_hba);
|
|
|
|
/* transport_generic_prepare_cdb():
|
|
*
|
|
* Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will
|
|
* contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2.
|
|
* The point of this is since we are mapping iSCSI LUNs to
|
|
* SCSI Target IDs having a non-zero LUN in the CDB will throw the
|
|
* devices and HBAs for a loop.
|
|
*/
|
|
static inline void transport_generic_prepare_cdb(
|
|
unsigned char *cdb)
|
|
{
|
|
switch (cdb[0]) {
|
|
case READ_10: /* SBC - RDProtect */
|
|
case READ_12: /* SBC - RDProtect */
|
|
case READ_16: /* SBC - RDProtect */
|
|
case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */
|
|
case VERIFY: /* SBC - VRProtect */
|
|
case VERIFY_16: /* SBC - VRProtect */
|
|
case WRITE_VERIFY: /* SBC - VRProtect */
|
|
case WRITE_VERIFY_12: /* SBC - VRProtect */
|
|
break;
|
|
default:
|
|
cdb[1] &= 0x1f; /* clear logical unit number */
|
|
break;
|
|
}
|
|
}
|
|
|
|
static struct se_task *
|
|
transport_generic_get_task(struct se_cmd *cmd,
|
|
enum dma_data_direction data_direction)
|
|
{
|
|
struct se_task *task;
|
|
struct se_device *dev = cmd->se_dev;
|
|
|
|
task = dev->transport->alloc_task(cmd->t_task_cdb);
|
|
if (!task) {
|
|
pr_err("Unable to allocate struct se_task\n");
|
|
return NULL;
|
|
}
|
|
|
|
INIT_LIST_HEAD(&task->t_list);
|
|
INIT_LIST_HEAD(&task->t_execute_list);
|
|
INIT_LIST_HEAD(&task->t_state_list);
|
|
init_completion(&task->task_stop_comp);
|
|
task->task_se_cmd = cmd;
|
|
task->task_data_direction = data_direction;
|
|
|
|
return task;
|
|
}
|
|
|
|
static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *);
|
|
|
|
/*
|
|
* Used by fabric modules containing a local struct se_cmd within their
|
|
* fabric dependent per I/O descriptor.
|
|
*/
|
|
void transport_init_se_cmd(
|
|
struct se_cmd *cmd,
|
|
struct target_core_fabric_ops *tfo,
|
|
struct se_session *se_sess,
|
|
u32 data_length,
|
|
int data_direction,
|
|
int task_attr,
|
|
unsigned char *sense_buffer)
|
|
{
|
|
INIT_LIST_HEAD(&cmd->se_lun_node);
|
|
INIT_LIST_HEAD(&cmd->se_delayed_node);
|
|
INIT_LIST_HEAD(&cmd->se_qf_node);
|
|
INIT_LIST_HEAD(&cmd->se_queue_node);
|
|
INIT_LIST_HEAD(&cmd->se_cmd_list);
|
|
INIT_LIST_HEAD(&cmd->t_task_list);
|
|
init_completion(&cmd->transport_lun_fe_stop_comp);
|
|
init_completion(&cmd->transport_lun_stop_comp);
|
|
init_completion(&cmd->t_transport_stop_comp);
|
|
init_completion(&cmd->cmd_wait_comp);
|
|
spin_lock_init(&cmd->t_state_lock);
|
|
cmd->transport_state = CMD_T_DEV_ACTIVE;
|
|
|
|
cmd->se_tfo = tfo;
|
|
cmd->se_sess = se_sess;
|
|
cmd->data_length = data_length;
|
|
cmd->data_direction = data_direction;
|
|
cmd->sam_task_attr = task_attr;
|
|
cmd->sense_buffer = sense_buffer;
|
|
}
|
|
EXPORT_SYMBOL(transport_init_se_cmd);
|
|
|
|
static int transport_check_alloc_task_attr(struct se_cmd *cmd)
|
|
{
|
|
/*
|
|
* Check if SAM Task Attribute emulation is enabled for this
|
|
* struct se_device storage object
|
|
*/
|
|
if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
|
|
return 0;
|
|
|
|
if (cmd->sam_task_attr == MSG_ACA_TAG) {
|
|
pr_debug("SAM Task Attribute ACA"
|
|
" emulation is not supported\n");
|
|
return -EINVAL;
|
|
}
|
|
/*
|
|
* Used to determine when ORDERED commands should go from
|
|
* Dormant to Active status.
|
|
*/
|
|
cmd->se_ordered_id = atomic_inc_return(&cmd->se_dev->dev_ordered_id);
|
|
smp_mb__after_atomic_inc();
|
|
pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
|
|
cmd->se_ordered_id, cmd->sam_task_attr,
|
|
cmd->se_dev->transport->name);
|
|
return 0;
|
|
}
|
|
|
|
/* transport_generic_allocate_tasks():
|
|
*
|
|
* Called from fabric RX Thread.
|
|
*/
|
|
int transport_generic_allocate_tasks(
|
|
struct se_cmd *cmd,
|
|
unsigned char *cdb)
|
|
{
|
|
int ret;
|
|
|
|
transport_generic_prepare_cdb(cdb);
|
|
/*
|
|
* Ensure that the received CDB is less than the max (252 + 8) bytes
|
|
* for VARIABLE_LENGTH_CMD
|
|
*/
|
|
if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
|
|
pr_err("Received SCSI CDB with command_size: %d that"
|
|
" exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
|
|
scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
|
|
cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
|
|
cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
|
|
return -EINVAL;
|
|
}
|
|
/*
|
|
* If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
|
|
* allocate the additional extended CDB buffer now.. Otherwise
|
|
* setup the pointer from __t_task_cdb to t_task_cdb.
|
|
*/
|
|
if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
|
|
cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
|
|
GFP_KERNEL);
|
|
if (!cmd->t_task_cdb) {
|
|
pr_err("Unable to allocate cmd->t_task_cdb"
|
|
" %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
|
|
scsi_command_size(cdb),
|
|
(unsigned long)sizeof(cmd->__t_task_cdb));
|
|
cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
|
|
cmd->scsi_sense_reason =
|
|
TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
return -ENOMEM;
|
|
}
|
|
} else
|
|
cmd->t_task_cdb = &cmd->__t_task_cdb[0];
|
|
/*
|
|
* Copy the original CDB into cmd->
|
|
*/
|
|
memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
|
|
/*
|
|
* Setup the received CDB based on SCSI defined opcodes and
|
|
* perform unit attention, persistent reservations and ALUA
|
|
* checks for virtual device backends. The cmd->t_task_cdb
|
|
* pointer is expected to be setup before we reach this point.
|
|
*/
|
|
ret = transport_generic_cmd_sequencer(cmd, cdb);
|
|
if (ret < 0)
|
|
return ret;
|
|
/*
|
|
* Check for SAM Task Attribute Emulation
|
|
*/
|
|
if (transport_check_alloc_task_attr(cmd) < 0) {
|
|
cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
|
|
cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
|
|
return -EINVAL;
|
|
}
|
|
spin_lock(&cmd->se_lun->lun_sep_lock);
|
|
if (cmd->se_lun->lun_sep)
|
|
cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
|
|
spin_unlock(&cmd->se_lun->lun_sep_lock);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(transport_generic_allocate_tasks);
|
|
|
|
/*
|
|
* Used by fabric module frontends to queue tasks directly.
|
|
* Many only be used from process context only
|
|
*/
|
|
int transport_handle_cdb_direct(
|
|
struct se_cmd *cmd)
|
|
{
|
|
int ret;
|
|
|
|
if (!cmd->se_lun) {
|
|
dump_stack();
|
|
pr_err("cmd->se_lun is NULL\n");
|
|
return -EINVAL;
|
|
}
|
|
if (in_interrupt()) {
|
|
dump_stack();
|
|
pr_err("transport_generic_handle_cdb cannot be called"
|
|
" from interrupt context\n");
|
|
return -EINVAL;
|
|
}
|
|
/*
|
|
* Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE following
|
|
* transport_generic_handle_cdb*() -> transport_add_cmd_to_queue()
|
|
* in existing usage to ensure that outstanding descriptors are handled
|
|
* correctly during shutdown via transport_wait_for_tasks()
|
|
*
|
|
* Also, we don't take cmd->t_state_lock here as we only expect
|
|
* this to be called for initial descriptor submission.
|
|
*/
|
|
cmd->t_state = TRANSPORT_NEW_CMD;
|
|
cmd->transport_state |= CMD_T_ACTIVE;
|
|
|
|
/*
|
|
* transport_generic_new_cmd() is already handling QUEUE_FULL,
|
|
* so follow TRANSPORT_NEW_CMD processing thread context usage
|
|
* and call transport_generic_request_failure() if necessary..
|
|
*/
|
|
ret = transport_generic_new_cmd(cmd);
|
|
if (ret < 0)
|
|
transport_generic_request_failure(cmd);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(transport_handle_cdb_direct);
|
|
|
|
/**
|
|
* target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
|
|
*
|
|
* @se_cmd: command descriptor to submit
|
|
* @se_sess: associated se_sess for endpoint
|
|
* @cdb: pointer to SCSI CDB
|
|
* @sense: pointer to SCSI sense buffer
|
|
* @unpacked_lun: unpacked LUN to reference for struct se_lun
|
|
* @data_length: fabric expected data transfer length
|
|
* @task_addr: SAM task attribute
|
|
* @data_dir: DMA data direction
|
|
* @flags: flags for command submission from target_sc_flags_tables
|
|
*
|
|
* This may only be called from process context, and also currently
|
|
* assumes internal allocation of fabric payload buffer by target-core.
|
|
**/
|
|
void target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
|
|
unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
|
|
u32 data_length, int task_attr, int data_dir, int flags)
|
|
{
|
|
struct se_portal_group *se_tpg;
|
|
int rc;
|
|
|
|
se_tpg = se_sess->se_tpg;
|
|
BUG_ON(!se_tpg);
|
|
BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
|
|
BUG_ON(in_interrupt());
|
|
/*
|
|
* Initialize se_cmd for target operation. From this point
|
|
* exceptions are handled by sending exception status via
|
|
* target_core_fabric_ops->queue_status() callback
|
|
*/
|
|
transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
|
|
data_length, data_dir, task_attr, sense);
|
|
/*
|
|
* Obtain struct se_cmd->cmd_kref reference and add new cmd to
|
|
* se_sess->sess_cmd_list. A second kref_get here is necessary
|
|
* for fabrics using TARGET_SCF_ACK_KREF that expect a second
|
|
* kref_put() to happen during fabric packet acknowledgement.
|
|
*/
|
|
target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
|
|
/*
|
|
* Signal bidirectional data payloads to target-core
|
|
*/
|
|
if (flags & TARGET_SCF_BIDI_OP)
|
|
se_cmd->se_cmd_flags |= SCF_BIDI;
|
|
/*
|
|
* Locate se_lun pointer and attach it to struct se_cmd
|
|
*/
|
|
if (transport_lookup_cmd_lun(se_cmd, unpacked_lun) < 0) {
|
|
transport_send_check_condition_and_sense(se_cmd,
|
|
se_cmd->scsi_sense_reason, 0);
|
|
target_put_sess_cmd(se_sess, se_cmd);
|
|
return;
|
|
}
|
|
/*
|
|
* Sanitize CDBs via transport_generic_cmd_sequencer() and
|
|
* allocate the necessary tasks to complete the received CDB+data
|
|
*/
|
|
rc = transport_generic_allocate_tasks(se_cmd, cdb);
|
|
if (rc != 0) {
|
|
transport_generic_request_failure(se_cmd);
|
|
return;
|
|
}
|
|
/*
|
|
* Dispatch se_cmd descriptor to se_lun->lun_se_dev backend
|
|
* for immediate execution of READs, otherwise wait for
|
|
* transport_generic_handle_data() to be called for WRITEs
|
|
* when fabric has filled the incoming buffer.
|
|
*/
|
|
transport_handle_cdb_direct(se_cmd);
|
|
return;
|
|
}
|
|
EXPORT_SYMBOL(target_submit_cmd);
|
|
|
|
static void target_complete_tmr_failure(struct work_struct *work)
|
|
{
|
|
struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
|
|
|
|
se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
|
|
se_cmd->se_tfo->queue_tm_rsp(se_cmd);
|
|
transport_generic_free_cmd(se_cmd, 0);
|
|
}
|
|
|
|
/**
|
|
* target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
|
|
* for TMR CDBs
|
|
*
|
|
* @se_cmd: command descriptor to submit
|
|
* @se_sess: associated se_sess for endpoint
|
|
* @sense: pointer to SCSI sense buffer
|
|
* @unpacked_lun: unpacked LUN to reference for struct se_lun
|
|
* @fabric_context: fabric context for TMR req
|
|
* @tm_type: Type of TM request
|
|
* @gfp: gfp type for caller
|
|
* @tag: referenced task tag for TMR_ABORT_TASK
|
|
* @flags: submit cmd flags
|
|
*
|
|
* Callable from all contexts.
|
|
**/
|
|
|
|
int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
|
|
unsigned char *sense, u32 unpacked_lun,
|
|
void *fabric_tmr_ptr, unsigned char tm_type,
|
|
gfp_t gfp, unsigned int tag, int flags)
|
|
{
|
|
struct se_portal_group *se_tpg;
|
|
int ret;
|
|
|
|
se_tpg = se_sess->se_tpg;
|
|
BUG_ON(!se_tpg);
|
|
|
|
transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
|
|
0, DMA_NONE, MSG_SIMPLE_TAG, sense);
|
|
/*
|
|
* FIXME: Currently expect caller to handle se_cmd->se_tmr_req
|
|
* allocation failure.
|
|
*/
|
|
ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
|
|
if (ret < 0)
|
|
return -ENOMEM;
|
|
|
|
if (tm_type == TMR_ABORT_TASK)
|
|
se_cmd->se_tmr_req->ref_task_tag = tag;
|
|
|
|
/* See target_submit_cmd for commentary */
|
|
target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
|
|
|
|
ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
|
|
if (ret) {
|
|
/*
|
|
* For callback during failure handling, push this work off
|
|
* to process context with TMR_LUN_DOES_NOT_EXIST status.
|
|
*/
|
|
INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
|
|
schedule_work(&se_cmd->work);
|
|
return 0;
|
|
}
|
|
transport_generic_handle_tmr(se_cmd);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(target_submit_tmr);
|
|
|
|
/*
|
|
* Used by fabric module frontends defining a TFO->new_cmd_map() caller
|
|
* to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to
|
|
* complete setup in TCM process context w/ TFO->new_cmd_map().
|
|
*/
|
|
int transport_generic_handle_cdb_map(
|
|
struct se_cmd *cmd)
|
|
{
|
|
if (!cmd->se_lun) {
|
|
dump_stack();
|
|
pr_err("cmd->se_lun is NULL\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP, false);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(transport_generic_handle_cdb_map);
|
|
|
|
/* transport_generic_handle_data():
|
|
*
|
|
*
|
|
*/
|
|
int transport_generic_handle_data(
|
|
struct se_cmd *cmd)
|
|
{
|
|
/*
|
|
* For the software fabric case, then we assume the nexus is being
|
|
* failed/shutdown when signals are pending from the kthread context
|
|
* caller, so we return a failure. For the HW target mode case running
|
|
* in interrupt code, the signal_pending() check is skipped.
|
|
*/
|
|
if (!in_interrupt() && signal_pending(current))
|
|
return -EPERM;
|
|
/*
|
|
* If the received CDB has aleady been ABORTED by the generic
|
|
* target engine, we now call transport_check_aborted_status()
|
|
* to queue any delated TASK_ABORTED status for the received CDB to the
|
|
* fabric module as we are expecting no further incoming DATA OUT
|
|
* sequences at this point.
|
|
*/
|
|
if (transport_check_aborted_status(cmd, 1) != 0)
|
|
return 0;
|
|
|
|
transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE, false);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(transport_generic_handle_data);
|
|
|
|
/* transport_generic_handle_tmr():
|
|
*
|
|
*
|
|
*/
|
|
int transport_generic_handle_tmr(
|
|
struct se_cmd *cmd)
|
|
{
|
|
transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR, false);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(transport_generic_handle_tmr);
|
|
|
|
/*
|
|
* If the task is active, request it to be stopped and sleep until it
|
|
* has completed.
|
|
*/
|
|
bool target_stop_task(struct se_task *task, unsigned long *flags)
|
|
{
|
|
struct se_cmd *cmd = task->task_se_cmd;
|
|
bool was_active = false;
|
|
|
|
if (task->task_flags & TF_ACTIVE) {
|
|
task->task_flags |= TF_REQUEST_STOP;
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
|
|
|
|
pr_debug("Task %p waiting to complete\n", task);
|
|
wait_for_completion(&task->task_stop_comp);
|
|
pr_debug("Task %p stopped successfully\n", task);
|
|
|
|
spin_lock_irqsave(&cmd->t_state_lock, *flags);
|
|
atomic_dec(&cmd->t_task_cdbs_left);
|
|
task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
|
|
was_active = true;
|
|
}
|
|
|
|
return was_active;
|
|
}
|
|
|
|
static int transport_stop_tasks_for_cmd(struct se_cmd *cmd)
|
|
{
|
|
struct se_task *task, *task_tmp;
|
|
unsigned long flags;
|
|
int ret = 0;
|
|
|
|
pr_debug("ITT[0x%08x] - Stopping tasks\n",
|
|
cmd->se_tfo->get_task_tag(cmd));
|
|
|
|
/*
|
|
* No tasks remain in the execution queue
|
|
*/
|
|
spin_lock_irqsave(&cmd->t_state_lock, flags);
|
|
list_for_each_entry_safe(task, task_tmp,
|
|
&cmd->t_task_list, t_list) {
|
|
pr_debug("Processing task %p\n", task);
|
|
/*
|
|
* If the struct se_task has not been sent and is not active,
|
|
* remove the struct se_task from the execution queue.
|
|
*/
|
|
if (!(task->task_flags & (TF_ACTIVE | TF_SENT))) {
|
|
spin_unlock_irqrestore(&cmd->t_state_lock,
|
|
flags);
|
|
transport_remove_task_from_execute_queue(task,
|
|
cmd->se_dev);
|
|
|
|
pr_debug("Task %p removed from execute queue\n", task);
|
|
spin_lock_irqsave(&cmd->t_state_lock, flags);
|
|
continue;
|
|
}
|
|
|
|
if (!target_stop_task(task, &flags)) {
|
|
pr_debug("Task %p - did nothing\n", task);
|
|
ret++;
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Handle SAM-esque emulation for generic transport request failures.
|
|
*/
|
|
void transport_generic_request_failure(struct se_cmd *cmd)
|
|
{
|
|
int ret = 0;
|
|
|
|
pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
|
|
" CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
|
|
cmd->t_task_cdb[0]);
|
|
pr_debug("-----[ i_state: %d t_state: %d scsi_sense_reason: %d\n",
|
|
cmd->se_tfo->get_cmd_state(cmd),
|
|
cmd->t_state, cmd->scsi_sense_reason);
|
|
pr_debug("-----[ t_tasks: %d t_task_cdbs_left: %d"
|
|
" t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --"
|
|
" CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
|
|
cmd->t_task_list_num,
|
|
atomic_read(&cmd->t_task_cdbs_left),
|
|
atomic_read(&cmd->t_task_cdbs_sent),
|
|
atomic_read(&cmd->t_task_cdbs_ex_left),
|
|
(cmd->transport_state & CMD_T_ACTIVE) != 0,
|
|
(cmd->transport_state & CMD_T_STOP) != 0,
|
|
(cmd->transport_state & CMD_T_SENT) != 0);
|
|
|
|
/*
|
|
* For SAM Task Attribute emulation for failed struct se_cmd
|
|
*/
|
|
if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
|
|
transport_complete_task_attr(cmd);
|
|
|
|
switch (cmd->scsi_sense_reason) {
|
|
case TCM_NON_EXISTENT_LUN:
|
|
case TCM_UNSUPPORTED_SCSI_OPCODE:
|
|
case TCM_INVALID_CDB_FIELD:
|
|
case TCM_INVALID_PARAMETER_LIST:
|
|
case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
|
|
case TCM_UNKNOWN_MODE_PAGE:
|
|
case TCM_WRITE_PROTECTED:
|
|
case TCM_CHECK_CONDITION_ABORT_CMD:
|
|
case TCM_CHECK_CONDITION_UNIT_ATTENTION:
|
|
case TCM_CHECK_CONDITION_NOT_READY:
|
|
break;
|
|
case TCM_RESERVATION_CONFLICT:
|
|
/*
|
|
* No SENSE Data payload for this case, set SCSI Status
|
|
* and queue the response to $FABRIC_MOD.
|
|
*
|
|
* Uses linux/include/scsi/scsi.h SAM status codes defs
|
|
*/
|
|
cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
|
|
/*
|
|
* For UA Interlock Code 11b, a RESERVATION CONFLICT will
|
|
* establish a UNIT ATTENTION with PREVIOUS RESERVATION
|
|
* CONFLICT STATUS.
|
|
*
|
|
* See spc4r17, section 7.4.6 Control Mode Page, Table 349
|
|
*/
|
|
if (cmd->se_sess &&
|
|
cmd->se_dev->se_sub_dev->se_dev_attrib.emulate_ua_intlck_ctrl == 2)
|
|
core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
|
|
cmd->orig_fe_lun, 0x2C,
|
|
ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
|
|
|
|
ret = cmd->se_tfo->queue_status(cmd);
|
|
if (ret == -EAGAIN || ret == -ENOMEM)
|
|
goto queue_full;
|
|
goto check_stop;
|
|
default:
|
|
pr_err("Unknown transport error for CDB 0x%02x: %d\n",
|
|
cmd->t_task_cdb[0], cmd->scsi_sense_reason);
|
|
cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
|
|
break;
|
|
}
|
|
/*
|
|
* If a fabric does not define a cmd->se_tfo->new_cmd_map caller,
|
|
* make the call to transport_send_check_condition_and_sense()
|
|
* directly. Otherwise expect the fabric to make the call to
|
|
* transport_send_check_condition_and_sense() after handling
|
|
* possible unsoliticied write data payloads.
|
|
*/
|
|
ret = transport_send_check_condition_and_sense(cmd,
|
|
cmd->scsi_sense_reason, 0);
|
|
if (ret == -EAGAIN || ret == -ENOMEM)
|
|
goto queue_full;
|
|
|
|
check_stop:
|
|
transport_lun_remove_cmd(cmd);
|
|
if (!transport_cmd_check_stop_to_fabric(cmd))
|
|
;
|
|
return;
|
|
|
|
queue_full:
|
|
cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
|
|
transport_handle_queue_full(cmd, cmd->se_dev);
|
|
}
|
|
EXPORT_SYMBOL(transport_generic_request_failure);
|
|
|
|
static inline u32 transport_lba_21(unsigned char *cdb)
|
|
{
|
|
return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
|
|
}
|
|
|
|
static inline u32 transport_lba_32(unsigned char *cdb)
|
|
{
|
|
return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
|
|
}
|
|
|
|
static inline unsigned long long transport_lba_64(unsigned char *cdb)
|
|
{
|
|
unsigned int __v1, __v2;
|
|
|
|
__v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
|
|
__v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
|
|
|
|
return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
|
|
}
|
|
|
|
/*
|
|
* For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs
|
|
*/
|
|
static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
|
|
{
|
|
unsigned int __v1, __v2;
|
|
|
|
__v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
|
|
__v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
|
|
|
|
return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
|
|
}
|
|
|
|
static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&se_cmd->t_state_lock, flags);
|
|
se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
|
|
spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* Called from Fabric Module context from transport_execute_tasks()
|
|
*
|
|
* The return of this function determins if the tasks from struct se_cmd
|
|
* get added to the execution queue in transport_execute_tasks(),
|
|
* or are added to the delayed or ordered lists here.
|
|
*/
|
|
static inline int transport_execute_task_attr(struct se_cmd *cmd)
|
|
{
|
|
if (cmd->se_dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED)
|
|
return 1;
|
|
/*
|
|
* Check for the existence of HEAD_OF_QUEUE, and if true return 1
|
|
* to allow the passed struct se_cmd list of tasks to the front of the list.
|
|
*/
|
|
if (cmd->sam_task_attr == MSG_HEAD_TAG) {
|
|
pr_debug("Added HEAD_OF_QUEUE for CDB:"
|
|
" 0x%02x, se_ordered_id: %u\n",
|
|
cmd->t_task_cdb[0],
|
|
cmd->se_ordered_id);
|
|
return 1;
|
|
} else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
|
|
atomic_inc(&cmd->se_dev->dev_ordered_sync);
|
|
smp_mb__after_atomic_inc();
|
|
|
|
pr_debug("Added ORDERED for CDB: 0x%02x to ordered"
|
|
" list, se_ordered_id: %u\n",
|
|
cmd->t_task_cdb[0],
|
|
cmd->se_ordered_id);
|
|
/*
|
|
* Add ORDERED command to tail of execution queue if
|
|
* no other older commands exist that need to be
|
|
* completed first.
|
|
*/
|
|
if (!atomic_read(&cmd->se_dev->simple_cmds))
|
|
return 1;
|
|
} else {
|
|
/*
|
|
* For SIMPLE and UNTAGGED Task Attribute commands
|
|
*/
|
|
atomic_inc(&cmd->se_dev->simple_cmds);
|
|
smp_mb__after_atomic_inc();
|
|
}
|
|
/*
|
|
* Otherwise if one or more outstanding ORDERED task attribute exist,
|
|
* add the dormant task(s) built for the passed struct se_cmd to the
|
|
* execution queue and become in Active state for this struct se_device.
|
|
*/
|
|
if (atomic_read(&cmd->se_dev->dev_ordered_sync) != 0) {
|
|
/*
|
|
* Otherwise, add cmd w/ tasks to delayed cmd queue that
|
|
* will be drained upon completion of HEAD_OF_QUEUE task.
|
|
*/
|
|
spin_lock(&cmd->se_dev->delayed_cmd_lock);
|
|
cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR;
|
|
list_add_tail(&cmd->se_delayed_node,
|
|
&cmd->se_dev->delayed_cmd_list);
|
|
spin_unlock(&cmd->se_dev->delayed_cmd_lock);
|
|
|
|
pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
|
|
" delayed CMD list, se_ordered_id: %u\n",
|
|
cmd->t_task_cdb[0], cmd->sam_task_attr,
|
|
cmd->se_ordered_id);
|
|
/*
|
|
* Return zero to let transport_execute_tasks() know
|
|
* not to add the delayed tasks to the execution list.
|
|
*/
|
|
return 0;
|
|
}
|
|
/*
|
|
* Otherwise, no ORDERED task attributes exist..
|
|
*/
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Called from fabric module context in transport_generic_new_cmd() and
|
|
* transport_generic_process_write()
|
|
*/
|
|
static int transport_execute_tasks(struct se_cmd *cmd)
|
|
{
|
|
int add_tasks;
|
|
struct se_device *se_dev = cmd->se_dev;
|
|
/*
|
|
* Call transport_cmd_check_stop() to see if a fabric exception
|
|
* has occurred that prevents execution.
|
|
*/
|
|
if (!transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING)) {
|
|
/*
|
|
* Check for SAM Task Attribute emulation and HEAD_OF_QUEUE
|
|
* attribute for the tasks of the received struct se_cmd CDB
|
|
*/
|
|
add_tasks = transport_execute_task_attr(cmd);
|
|
if (!add_tasks)
|
|
goto execute_tasks;
|
|
/*
|
|
* __transport_execute_tasks() -> __transport_add_tasks_from_cmd()
|
|
* adds associated se_tasks while holding dev->execute_task_lock
|
|
* before I/O dispath to avoid a double spinlock access.
|
|
*/
|
|
__transport_execute_tasks(se_dev, cmd);
|
|
return 0;
|
|
}
|
|
|
|
execute_tasks:
|
|
__transport_execute_tasks(se_dev, NULL);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Called to check struct se_device tcq depth window, and once open pull struct se_task
|
|
* from struct se_device->execute_task_list and
|
|
*
|
|
* Called from transport_processing_thread()
|
|
*/
|
|
static int __transport_execute_tasks(struct se_device *dev, struct se_cmd *new_cmd)
|
|
{
|
|
int error;
|
|
struct se_cmd *cmd = NULL;
|
|
struct se_task *task = NULL;
|
|
unsigned long flags;
|
|
|
|
check_depth:
|
|
spin_lock_irq(&dev->execute_task_lock);
|
|
if (new_cmd != NULL)
|
|
__transport_add_tasks_from_cmd(new_cmd);
|
|
|
|
if (list_empty(&dev->execute_task_list)) {
|
|
spin_unlock_irq(&dev->execute_task_lock);
|
|
return 0;
|
|
}
|
|
task = list_first_entry(&dev->execute_task_list,
|
|
struct se_task, t_execute_list);
|
|
__transport_remove_task_from_execute_queue(task, dev);
|
|
spin_unlock_irq(&dev->execute_task_lock);
|
|
|
|
cmd = task->task_se_cmd;
|
|
spin_lock_irqsave(&cmd->t_state_lock, flags);
|
|
task->task_flags |= (TF_ACTIVE | TF_SENT);
|
|
atomic_inc(&cmd->t_task_cdbs_sent);
|
|
|
|
if (atomic_read(&cmd->t_task_cdbs_sent) ==
|
|
cmd->t_task_list_num)
|
|
cmd->transport_state |= CMD_T_SENT;
|
|
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
|
|
if (cmd->execute_task)
|
|
error = cmd->execute_task(task);
|
|
else
|
|
error = dev->transport->do_task(task);
|
|
if (error != 0) {
|
|
spin_lock_irqsave(&cmd->t_state_lock, flags);
|
|
task->task_flags &= ~TF_ACTIVE;
|
|
cmd->transport_state &= ~CMD_T_SENT;
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
|
|
transport_stop_tasks_for_cmd(cmd);
|
|
transport_generic_request_failure(cmd);
|
|
}
|
|
|
|
new_cmd = NULL;
|
|
goto check_depth;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline u32 transport_get_sectors_6(
|
|
unsigned char *cdb,
|
|
struct se_cmd *cmd,
|
|
int *ret)
|
|
{
|
|
struct se_device *dev = cmd->se_dev;
|
|
|
|
/*
|
|
* Assume TYPE_DISK for non struct se_device objects.
|
|
* Use 8-bit sector value.
|
|
*/
|
|
if (!dev)
|
|
goto type_disk;
|
|
|
|
/*
|
|
* Use 24-bit allocation length for TYPE_TAPE.
|
|
*/
|
|
if (dev->transport->get_device_type(dev) == TYPE_TAPE)
|
|
return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4];
|
|
|
|
/*
|
|
* Everything else assume TYPE_DISK Sector CDB location.
|
|
* Use 8-bit sector value. SBC-3 says:
|
|
*
|
|
* A TRANSFER LENGTH field set to zero specifies that 256
|
|
* logical blocks shall be written. Any other value
|
|
* specifies the number of logical blocks that shall be
|
|
* written.
|
|
*/
|
|
type_disk:
|
|
return cdb[4] ? : 256;
|
|
}
|
|
|
|
static inline u32 transport_get_sectors_10(
|
|
unsigned char *cdb,
|
|
struct se_cmd *cmd,
|
|
int *ret)
|
|
{
|
|
struct se_device *dev = cmd->se_dev;
|
|
|
|
/*
|
|
* Assume TYPE_DISK for non struct se_device objects.
|
|
* Use 16-bit sector value.
|
|
*/
|
|
if (!dev)
|
|
goto type_disk;
|
|
|
|
/*
|
|
* XXX_10 is not defined in SSC, throw an exception
|
|
*/
|
|
if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
|
|
*ret = -EINVAL;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Everything else assume TYPE_DISK Sector CDB location.
|
|
* Use 16-bit sector value.
|
|
*/
|
|
type_disk:
|
|
return (u32)(cdb[7] << 8) + cdb[8];
|
|
}
|
|
|
|
static inline u32 transport_get_sectors_12(
|
|
unsigned char *cdb,
|
|
struct se_cmd *cmd,
|
|
int *ret)
|
|
{
|
|
struct se_device *dev = cmd->se_dev;
|
|
|
|
/*
|
|
* Assume TYPE_DISK for non struct se_device objects.
|
|
* Use 32-bit sector value.
|
|
*/
|
|
if (!dev)
|
|
goto type_disk;
|
|
|
|
/*
|
|
* XXX_12 is not defined in SSC, throw an exception
|
|
*/
|
|
if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
|
|
*ret = -EINVAL;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Everything else assume TYPE_DISK Sector CDB location.
|
|
* Use 32-bit sector value.
|
|
*/
|
|
type_disk:
|
|
return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
|
|
}
|
|
|
|
static inline u32 transport_get_sectors_16(
|
|
unsigned char *cdb,
|
|
struct se_cmd *cmd,
|
|
int *ret)
|
|
{
|
|
struct se_device *dev = cmd->se_dev;
|
|
|
|
/*
|
|
* Assume TYPE_DISK for non struct se_device objects.
|
|
* Use 32-bit sector value.
|
|
*/
|
|
if (!dev)
|
|
goto type_disk;
|
|
|
|
/*
|
|
* Use 24-bit allocation length for TYPE_TAPE.
|
|
*/
|
|
if (dev->transport->get_device_type(dev) == TYPE_TAPE)
|
|
return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14];
|
|
|
|
type_disk:
|
|
return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
|
|
(cdb[12] << 8) + cdb[13];
|
|
}
|
|
|
|
/*
|
|
* Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants
|
|
*/
|
|
static inline u32 transport_get_sectors_32(
|
|
unsigned char *cdb,
|
|
struct se_cmd *cmd,
|
|
int *ret)
|
|
{
|
|
/*
|
|
* Assume TYPE_DISK for non struct se_device objects.
|
|
* Use 32-bit sector value.
|
|
*/
|
|
return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
|
|
(cdb[30] << 8) + cdb[31];
|
|
|
|
}
|
|
|
|
static inline u32 transport_get_size(
|
|
u32 sectors,
|
|
unsigned char *cdb,
|
|
struct se_cmd *cmd)
|
|
{
|
|
struct se_device *dev = cmd->se_dev;
|
|
|
|
if (dev->transport->get_device_type(dev) == TYPE_TAPE) {
|
|
if (cdb[1] & 1) { /* sectors */
|
|
return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
|
|
} else /* bytes */
|
|
return sectors;
|
|
}
|
|
#if 0
|
|
pr_debug("Returning block_size: %u, sectors: %u == %u for"
|
|
" %s object\n", dev->se_sub_dev->se_dev_attrib.block_size, sectors,
|
|
dev->se_sub_dev->se_dev_attrib.block_size * sectors,
|
|
dev->transport->name);
|
|
#endif
|
|
return dev->se_sub_dev->se_dev_attrib.block_size * sectors;
|
|
}
|
|
|
|
static void transport_xor_callback(struct se_cmd *cmd)
|
|
{
|
|
unsigned char *buf, *addr;
|
|
struct scatterlist *sg;
|
|
unsigned int offset;
|
|
int i;
|
|
int count;
|
|
/*
|
|
* From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
|
|
*
|
|
* 1) read the specified logical block(s);
|
|
* 2) transfer logical blocks from the data-out buffer;
|
|
* 3) XOR the logical blocks transferred from the data-out buffer with
|
|
* the logical blocks read, storing the resulting XOR data in a buffer;
|
|
* 4) if the DISABLE WRITE bit is set to zero, then write the logical
|
|
* blocks transferred from the data-out buffer; and
|
|
* 5) transfer the resulting XOR data to the data-in buffer.
|
|
*/
|
|
buf = kmalloc(cmd->data_length, GFP_KERNEL);
|
|
if (!buf) {
|
|
pr_err("Unable to allocate xor_callback buf\n");
|
|
return;
|
|
}
|
|
/*
|
|
* Copy the scatterlist WRITE buffer located at cmd->t_data_sg
|
|
* into the locally allocated *buf
|
|
*/
|
|
sg_copy_to_buffer(cmd->t_data_sg,
|
|
cmd->t_data_nents,
|
|
buf,
|
|
cmd->data_length);
|
|
|
|
/*
|
|
* Now perform the XOR against the BIDI read memory located at
|
|
* cmd->t_mem_bidi_list
|
|
*/
|
|
|
|
offset = 0;
|
|
for_each_sg(cmd->t_bidi_data_sg, sg, cmd->t_bidi_data_nents, count) {
|
|
addr = kmap_atomic(sg_page(sg));
|
|
if (!addr)
|
|
goto out;
|
|
|
|
for (i = 0; i < sg->length; i++)
|
|
*(addr + sg->offset + i) ^= *(buf + offset + i);
|
|
|
|
offset += sg->length;
|
|
kunmap_atomic(addr);
|
|
}
|
|
|
|
out:
|
|
kfree(buf);
|
|
}
|
|
|
|
/*
|
|
* Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd
|
|
*/
|
|
static int transport_get_sense_data(struct se_cmd *cmd)
|
|
{
|
|
unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL;
|
|
struct se_device *dev = cmd->se_dev;
|
|
struct se_task *task = NULL, *task_tmp;
|
|
unsigned long flags;
|
|
u32 offset = 0;
|
|
|
|
WARN_ON(!cmd->se_lun);
|
|
|
|
if (!dev)
|
|
return 0;
|
|
|
|
spin_lock_irqsave(&cmd->t_state_lock, flags);
|
|
if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
return 0;
|
|
}
|
|
|
|
list_for_each_entry_safe(task, task_tmp,
|
|
&cmd->t_task_list, t_list) {
|
|
if (!(task->task_flags & TF_HAS_SENSE))
|
|
continue;
|
|
|
|
if (!dev->transport->get_sense_buffer) {
|
|
pr_err("dev->transport->get_sense_buffer"
|
|
" is NULL\n");
|
|
continue;
|
|
}
|
|
|
|
sense_buffer = dev->transport->get_sense_buffer(task);
|
|
if (!sense_buffer) {
|
|
pr_err("ITT[0x%08x]_TASK[%p]: Unable to locate"
|
|
" sense buffer for task with sense\n",
|
|
cmd->se_tfo->get_task_tag(cmd), task);
|
|
continue;
|
|
}
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
|
|
offset = cmd->se_tfo->set_fabric_sense_len(cmd,
|
|
TRANSPORT_SENSE_BUFFER);
|
|
|
|
memcpy(&buffer[offset], sense_buffer,
|
|
TRANSPORT_SENSE_BUFFER);
|
|
cmd->scsi_status = task->task_scsi_status;
|
|
/* Automatically padded */
|
|
cmd->scsi_sense_length =
|
|
(TRANSPORT_SENSE_BUFFER + offset);
|
|
|
|
pr_debug("HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x"
|
|
" and sense\n",
|
|
dev->se_hba->hba_id, dev->transport->name,
|
|
cmd->scsi_status);
|
|
return 0;
|
|
}
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
|
|
return -1;
|
|
}
|
|
|
|
static inline long long transport_dev_end_lba(struct se_device *dev)
|
|
{
|
|
return dev->transport->get_blocks(dev) + 1;
|
|
}
|
|
|
|
static int transport_cmd_get_valid_sectors(struct se_cmd *cmd)
|
|
{
|
|
struct se_device *dev = cmd->se_dev;
|
|
u32 sectors;
|
|
|
|
if (dev->transport->get_device_type(dev) != TYPE_DISK)
|
|
return 0;
|
|
|
|
sectors = (cmd->data_length / dev->se_sub_dev->se_dev_attrib.block_size);
|
|
|
|
if ((cmd->t_task_lba + sectors) > transport_dev_end_lba(dev)) {
|
|
pr_err("LBA: %llu Sectors: %u exceeds"
|
|
" transport_dev_end_lba(): %llu\n",
|
|
cmd->t_task_lba, sectors,
|
|
transport_dev_end_lba(dev));
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int target_check_write_same_discard(unsigned char *flags, struct se_device *dev)
|
|
{
|
|
/*
|
|
* Determine if the received WRITE_SAME is used to for direct
|
|
* passthrough into Linux/SCSI with struct request via TCM/pSCSI
|
|
* or we are signaling the use of internal WRITE_SAME + UNMAP=1
|
|
* emulation for -> Linux/BLOCK disbard with TCM/IBLOCK code.
|
|
*/
|
|
int passthrough = (dev->transport->transport_type ==
|
|
TRANSPORT_PLUGIN_PHBA_PDEV);
|
|
|
|
if (!passthrough) {
|
|
if ((flags[0] & 0x04) || (flags[0] & 0x02)) {
|
|
pr_err("WRITE_SAME PBDATA and LBDATA"
|
|
" bits not supported for Block Discard"
|
|
" Emulation\n");
|
|
return -ENOSYS;
|
|
}
|
|
/*
|
|
* Currently for the emulated case we only accept
|
|
* tpws with the UNMAP=1 bit set.
|
|
*/
|
|
if (!(flags[0] & 0x08)) {
|
|
pr_err("WRITE_SAME w/o UNMAP bit not"
|
|
" supported for Block Discard Emulation\n");
|
|
return -ENOSYS;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* transport_generic_cmd_sequencer():
|
|
*
|
|
* Generic Command Sequencer that should work for most DAS transport
|
|
* drivers.
|
|
*
|
|
* Called from transport_generic_allocate_tasks() in the $FABRIC_MOD
|
|
* RX Thread.
|
|
*
|
|
* FIXME: Need to support other SCSI OPCODES where as well.
|
|
*/
|
|
static int transport_generic_cmd_sequencer(
|
|
struct se_cmd *cmd,
|
|
unsigned char *cdb)
|
|
{
|
|
struct se_device *dev = cmd->se_dev;
|
|
struct se_subsystem_dev *su_dev = dev->se_sub_dev;
|
|
int ret = 0, sector_ret = 0, passthrough;
|
|
u32 sectors = 0, size = 0, pr_reg_type = 0;
|
|
u16 service_action;
|
|
u8 alua_ascq = 0;
|
|
/*
|
|
* Check for an existing UNIT ATTENTION condition
|
|
*/
|
|
if (core_scsi3_ua_check(cmd, cdb) < 0) {
|
|
cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
|
|
cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION;
|
|
return -EINVAL;
|
|
}
|
|
/*
|
|
* Check status of Asymmetric Logical Unit Assignment port
|
|
*/
|
|
ret = su_dev->t10_alua.alua_state_check(cmd, cdb, &alua_ascq);
|
|
if (ret != 0) {
|
|
/*
|
|
* Set SCSI additional sense code (ASC) to 'LUN Not Accessible';
|
|
* The ALUA additional sense code qualifier (ASCQ) is determined
|
|
* by the ALUA primary or secondary access state..
|
|
*/
|
|
if (ret > 0) {
|
|
#if 0
|
|
pr_debug("[%s]: ALUA TG Port not available,"
|
|
" SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n",
|
|
cmd->se_tfo->get_fabric_name(), alua_ascq);
|
|
#endif
|
|
transport_set_sense_codes(cmd, 0x04, alua_ascq);
|
|
cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
|
|
cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY;
|
|
return -EINVAL;
|
|
}
|
|
goto out_invalid_cdb_field;
|
|
}
|
|
/*
|
|
* Check status for SPC-3 Persistent Reservations
|
|
*/
|
|
if (su_dev->t10_pr.pr_ops.t10_reservation_check(cmd, &pr_reg_type) != 0) {
|
|
if (su_dev->t10_pr.pr_ops.t10_seq_non_holder(
|
|
cmd, cdb, pr_reg_type) != 0) {
|
|
cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
|
|
cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT;
|
|
cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
|
|
cmd->scsi_sense_reason = TCM_RESERVATION_CONFLICT;
|
|
return -EBUSY;
|
|
}
|
|
/*
|
|
* This means the CDB is allowed for the SCSI Initiator port
|
|
* when said port is *NOT* holding the legacy SPC-2 or
|
|
* SPC-3 Persistent Reservation.
|
|
*/
|
|
}
|
|
|
|
/*
|
|
* If we operate in passthrough mode we skip most CDB emulation and
|
|
* instead hand the commands down to the physical SCSI device.
|
|
*/
|
|
passthrough =
|
|
(dev->transport->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV);
|
|
|
|
switch (cdb[0]) {
|
|
case READ_6:
|
|
sectors = transport_get_sectors_6(cdb, cmd, §or_ret);
|
|
if (sector_ret)
|
|
goto out_unsupported_cdb;
|
|
size = transport_get_size(sectors, cdb, cmd);
|
|
cmd->t_task_lba = transport_lba_21(cdb);
|
|
cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
|
|
break;
|
|
case READ_10:
|
|
sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
|
|
if (sector_ret)
|
|
goto out_unsupported_cdb;
|
|
size = transport_get_size(sectors, cdb, cmd);
|
|
cmd->t_task_lba = transport_lba_32(cdb);
|
|
cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
|
|
break;
|
|
case READ_12:
|
|
sectors = transport_get_sectors_12(cdb, cmd, §or_ret);
|
|
if (sector_ret)
|
|
goto out_unsupported_cdb;
|
|
size = transport_get_size(sectors, cdb, cmd);
|
|
cmd->t_task_lba = transport_lba_32(cdb);
|
|
cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
|
|
break;
|
|
case READ_16:
|
|
sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
|
|
if (sector_ret)
|
|
goto out_unsupported_cdb;
|
|
size = transport_get_size(sectors, cdb, cmd);
|
|
cmd->t_task_lba = transport_lba_64(cdb);
|
|
cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
|
|
break;
|
|
case WRITE_6:
|
|
sectors = transport_get_sectors_6(cdb, cmd, §or_ret);
|
|
if (sector_ret)
|
|
goto out_unsupported_cdb;
|
|
size = transport_get_size(sectors, cdb, cmd);
|
|
cmd->t_task_lba = transport_lba_21(cdb);
|
|
cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
|
|
break;
|
|
case WRITE_10:
|
|
sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
|
|
if (sector_ret)
|
|
goto out_unsupported_cdb;
|
|
size = transport_get_size(sectors, cdb, cmd);
|
|
cmd->t_task_lba = transport_lba_32(cdb);
|
|
if (cdb[1] & 0x8)
|
|
cmd->se_cmd_flags |= SCF_FUA;
|
|
cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
|
|
break;
|
|
case WRITE_12:
|
|
sectors = transport_get_sectors_12(cdb, cmd, §or_ret);
|
|
if (sector_ret)
|
|
goto out_unsupported_cdb;
|
|
size = transport_get_size(sectors, cdb, cmd);
|
|
cmd->t_task_lba = transport_lba_32(cdb);
|
|
if (cdb[1] & 0x8)
|
|
cmd->se_cmd_flags |= SCF_FUA;
|
|
cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
|
|
break;
|
|
case WRITE_16:
|
|
sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
|
|
if (sector_ret)
|
|
goto out_unsupported_cdb;
|
|
size = transport_get_size(sectors, cdb, cmd);
|
|
cmd->t_task_lba = transport_lba_64(cdb);
|
|
if (cdb[1] & 0x8)
|
|
cmd->se_cmd_flags |= SCF_FUA;
|
|
cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
|
|
break;
|
|
case XDWRITEREAD_10:
|
|
if ((cmd->data_direction != DMA_TO_DEVICE) ||
|
|
!(cmd->se_cmd_flags & SCF_BIDI))
|
|
goto out_invalid_cdb_field;
|
|
sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
|
|
if (sector_ret)
|
|
goto out_unsupported_cdb;
|
|
size = transport_get_size(sectors, cdb, cmd);
|
|
cmd->t_task_lba = transport_lba_32(cdb);
|
|
cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
|
|
|
|
/*
|
|
* Do now allow BIDI commands for passthrough mode.
|
|
*/
|
|
if (passthrough)
|
|
goto out_unsupported_cdb;
|
|
|
|
/*
|
|
* Setup BIDI XOR callback to be run after I/O completion.
|
|
*/
|
|
cmd->transport_complete_callback = &transport_xor_callback;
|
|
if (cdb[1] & 0x8)
|
|
cmd->se_cmd_flags |= SCF_FUA;
|
|
break;
|
|
case VARIABLE_LENGTH_CMD:
|
|
service_action = get_unaligned_be16(&cdb[8]);
|
|
switch (service_action) {
|
|
case XDWRITEREAD_32:
|
|
sectors = transport_get_sectors_32(cdb, cmd, §or_ret);
|
|
if (sector_ret)
|
|
goto out_unsupported_cdb;
|
|
size = transport_get_size(sectors, cdb, cmd);
|
|
/*
|
|
* Use WRITE_32 and READ_32 opcodes for the emulated
|
|
* XDWRITE_READ_32 logic.
|
|
*/
|
|
cmd->t_task_lba = transport_lba_64_ext(cdb);
|
|
cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB;
|
|
|
|
/*
|
|
* Do now allow BIDI commands for passthrough mode.
|
|
*/
|
|
if (passthrough)
|
|
goto out_unsupported_cdb;
|
|
|
|
/*
|
|
* Setup BIDI XOR callback to be run during after I/O
|
|
* completion.
|
|
*/
|
|
cmd->transport_complete_callback = &transport_xor_callback;
|
|
if (cdb[1] & 0x8)
|
|
cmd->se_cmd_flags |= SCF_FUA;
|
|
break;
|
|
case WRITE_SAME_32:
|
|
sectors = transport_get_sectors_32(cdb, cmd, §or_ret);
|
|
if (sector_ret)
|
|
goto out_unsupported_cdb;
|
|
|
|
if (sectors)
|
|
size = transport_get_size(1, cdb, cmd);
|
|
else {
|
|
pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not"
|
|
" supported\n");
|
|
goto out_invalid_cdb_field;
|
|
}
|
|
|
|
cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
|
|
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
|
|
|
|
if (target_check_write_same_discard(&cdb[10], dev) < 0)
|
|
goto out_unsupported_cdb;
|
|
if (!passthrough)
|
|
cmd->execute_task = target_emulate_write_same;
|
|
break;
|
|
default:
|
|
pr_err("VARIABLE_LENGTH_CMD service action"
|
|
" 0x%04x not supported\n", service_action);
|
|
goto out_unsupported_cdb;
|
|
}
|
|
break;
|
|
case MAINTENANCE_IN:
|
|
if (dev->transport->get_device_type(dev) != TYPE_ROM) {
|
|
/* MAINTENANCE_IN from SCC-2 */
|
|
/*
|
|
* Check for emulated MI_REPORT_TARGET_PGS.
|
|
*/
|
|
if (cdb[1] == MI_REPORT_TARGET_PGS &&
|
|
su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
|
|
cmd->execute_task =
|
|
target_emulate_report_target_port_groups;
|
|
}
|
|
size = (cdb[6] << 24) | (cdb[7] << 16) |
|
|
(cdb[8] << 8) | cdb[9];
|
|
} else {
|
|
/* GPCMD_SEND_KEY from multi media commands */
|
|
size = (cdb[8] << 8) + cdb[9];
|
|
}
|
|
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
|
|
break;
|
|
case MODE_SELECT:
|
|
size = cdb[4];
|
|
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
|
|
break;
|
|
case MODE_SELECT_10:
|
|
size = (cdb[7] << 8) + cdb[8];
|
|
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
|
|
break;
|
|
case MODE_SENSE:
|
|
size = cdb[4];
|
|
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
|
|
if (!passthrough)
|
|
cmd->execute_task = target_emulate_modesense;
|
|
break;
|
|
case MODE_SENSE_10:
|
|
size = (cdb[7] << 8) + cdb[8];
|
|
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
|
|
if (!passthrough)
|
|
cmd->execute_task = target_emulate_modesense;
|
|
break;
|
|
case GPCMD_READ_BUFFER_CAPACITY:
|
|
case GPCMD_SEND_OPC:
|
|
case LOG_SELECT:
|
|
case LOG_SENSE:
|
|
size = (cdb[7] << 8) + cdb[8];
|
|
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
|
|
break;
|
|
case READ_BLOCK_LIMITS:
|
|
size = READ_BLOCK_LEN;
|
|
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
|
|
break;
|
|
case GPCMD_GET_CONFIGURATION:
|
|
case GPCMD_READ_FORMAT_CAPACITIES:
|
|
case GPCMD_READ_DISC_INFO:
|
|
case GPCMD_READ_TRACK_RZONE_INFO:
|
|
size = (cdb[7] << 8) + cdb[8];
|
|
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
|
|
break;
|
|
case PERSISTENT_RESERVE_IN:
|
|
if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
|
|
cmd->execute_task = target_scsi3_emulate_pr_in;
|
|
size = (cdb[7] << 8) + cdb[8];
|
|
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
|
|
break;
|
|
case PERSISTENT_RESERVE_OUT:
|
|
if (su_dev->t10_pr.res_type == SPC3_PERSISTENT_RESERVATIONS)
|
|
cmd->execute_task = target_scsi3_emulate_pr_out;
|
|
size = (cdb[7] << 8) + cdb[8];
|
|
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
|
|
break;
|
|
case GPCMD_MECHANISM_STATUS:
|
|
case GPCMD_READ_DVD_STRUCTURE:
|
|
size = (cdb[8] << 8) + cdb[9];
|
|
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
|
|
break;
|
|
case READ_POSITION:
|
|
size = READ_POSITION_LEN;
|
|
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
|
|
break;
|
|
case MAINTENANCE_OUT:
|
|
if (dev->transport->get_device_type(dev) != TYPE_ROM) {
|
|
/* MAINTENANCE_OUT from SCC-2
|
|
*
|
|
* Check for emulated MO_SET_TARGET_PGS.
|
|
*/
|
|
if (cdb[1] == MO_SET_TARGET_PGS &&
|
|
su_dev->t10_alua.alua_type == SPC3_ALUA_EMULATED) {
|
|
cmd->execute_task =
|
|
target_emulate_set_target_port_groups;
|
|
}
|
|
|
|
size = (cdb[6] << 24) | (cdb[7] << 16) |
|
|
(cdb[8] << 8) | cdb[9];
|
|
} else {
|
|
/* GPCMD_REPORT_KEY from multi media commands */
|
|
size = (cdb[8] << 8) + cdb[9];
|
|
}
|
|
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
|
|
break;
|
|
case INQUIRY:
|
|
size = (cdb[3] << 8) + cdb[4];
|
|
/*
|
|
* Do implict HEAD_OF_QUEUE processing for INQUIRY.
|
|
* See spc4r17 section 5.3
|
|
*/
|
|
if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
|
|
cmd->sam_task_attr = MSG_HEAD_TAG;
|
|
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
|
|
if (!passthrough)
|
|
cmd->execute_task = target_emulate_inquiry;
|
|
break;
|
|
case READ_BUFFER:
|
|
size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
|
|
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
|
|
break;
|
|
case READ_CAPACITY:
|
|
size = READ_CAP_LEN;
|
|
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
|
|
if (!passthrough)
|
|
cmd->execute_task = target_emulate_readcapacity;
|
|
break;
|
|
case READ_MEDIA_SERIAL_NUMBER:
|
|
case SECURITY_PROTOCOL_IN:
|
|
case SECURITY_PROTOCOL_OUT:
|
|
size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
|
|
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
|
|
break;
|
|
case SERVICE_ACTION_IN:
|
|
switch (cmd->t_task_cdb[1] & 0x1f) {
|
|
case SAI_READ_CAPACITY_16:
|
|
if (!passthrough)
|
|
cmd->execute_task =
|
|
target_emulate_readcapacity_16;
|
|
break;
|
|
default:
|
|
if (passthrough)
|
|
break;
|
|
|
|
pr_err("Unsupported SA: 0x%02x\n",
|
|
cmd->t_task_cdb[1] & 0x1f);
|
|
goto out_invalid_cdb_field;
|
|
}
|
|
/*FALLTHROUGH*/
|
|
case ACCESS_CONTROL_IN:
|
|
case ACCESS_CONTROL_OUT:
|
|
case EXTENDED_COPY:
|
|
case READ_ATTRIBUTE:
|
|
case RECEIVE_COPY_RESULTS:
|
|
case WRITE_ATTRIBUTE:
|
|
size = (cdb[10] << 24) | (cdb[11] << 16) |
|
|
(cdb[12] << 8) | cdb[13];
|
|
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
|
|
break;
|
|
case RECEIVE_DIAGNOSTIC:
|
|
case SEND_DIAGNOSTIC:
|
|
size = (cdb[3] << 8) | cdb[4];
|
|
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
|
|
break;
|
|
/* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */
|
|
#if 0
|
|
case GPCMD_READ_CD:
|
|
sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
|
|
size = (2336 * sectors);
|
|
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
|
|
break;
|
|
#endif
|
|
case READ_TOC:
|
|
size = cdb[8];
|
|
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
|
|
break;
|
|
case REQUEST_SENSE:
|
|
size = cdb[4];
|
|
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
|
|
if (!passthrough)
|
|
cmd->execute_task = target_emulate_request_sense;
|
|
break;
|
|
case READ_ELEMENT_STATUS:
|
|
size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9];
|
|
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
|
|
break;
|
|
case WRITE_BUFFER:
|
|
size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
|
|
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
|
|
break;
|
|
case RESERVE:
|
|
case RESERVE_10:
|
|
/*
|
|
* The SPC-2 RESERVE does not contain a size in the SCSI CDB.
|
|
* Assume the passthrough or $FABRIC_MOD will tell us about it.
|
|
*/
|
|
if (cdb[0] == RESERVE_10)
|
|
size = (cdb[7] << 8) | cdb[8];
|
|
else
|
|
size = cmd->data_length;
|
|
|
|
/*
|
|
* Setup the legacy emulated handler for SPC-2 and
|
|
* >= SPC-3 compatible reservation handling (CRH=1)
|
|
* Otherwise, we assume the underlying SCSI logic is
|
|
* is running in SPC_PASSTHROUGH, and wants reservations
|
|
* emulation disabled.
|
|
*/
|
|
if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
|
|
cmd->execute_task = target_scsi2_reservation_reserve;
|
|
cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
|
|
break;
|
|
case RELEASE:
|
|
case RELEASE_10:
|
|
/*
|
|
* The SPC-2 RELEASE does not contain a size in the SCSI CDB.
|
|
* Assume the passthrough or $FABRIC_MOD will tell us about it.
|
|
*/
|
|
if (cdb[0] == RELEASE_10)
|
|
size = (cdb[7] << 8) | cdb[8];
|
|
else
|
|
size = cmd->data_length;
|
|
|
|
if (su_dev->t10_pr.res_type != SPC_PASSTHROUGH)
|
|
cmd->execute_task = target_scsi2_reservation_release;
|
|
cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
|
|
break;
|
|
case SYNCHRONIZE_CACHE:
|
|
case SYNCHRONIZE_CACHE_16:
|
|
/*
|
|
* Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE
|
|
*/
|
|
if (cdb[0] == SYNCHRONIZE_CACHE) {
|
|
sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
|
|
cmd->t_task_lba = transport_lba_32(cdb);
|
|
} else {
|
|
sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
|
|
cmd->t_task_lba = transport_lba_64(cdb);
|
|
}
|
|
if (sector_ret)
|
|
goto out_unsupported_cdb;
|
|
|
|
size = transport_get_size(sectors, cdb, cmd);
|
|
cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
|
|
|
|
if (passthrough)
|
|
break;
|
|
|
|
/*
|
|
* Check to ensure that LBA + Range does not exceed past end of
|
|
* device for IBLOCK and FILEIO ->do_sync_cache() backend calls
|
|
*/
|
|
if ((cmd->t_task_lba != 0) || (sectors != 0)) {
|
|
if (transport_cmd_get_valid_sectors(cmd) < 0)
|
|
goto out_invalid_cdb_field;
|
|
}
|
|
cmd->execute_task = target_emulate_synchronize_cache;
|
|
break;
|
|
case UNMAP:
|
|
size = get_unaligned_be16(&cdb[7]);
|
|
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
|
|
if (!passthrough)
|
|
cmd->execute_task = target_emulate_unmap;
|
|
break;
|
|
case WRITE_SAME_16:
|
|
sectors = transport_get_sectors_16(cdb, cmd, §or_ret);
|
|
if (sector_ret)
|
|
goto out_unsupported_cdb;
|
|
|
|
if (sectors)
|
|
size = transport_get_size(1, cdb, cmd);
|
|
else {
|
|
pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
|
|
goto out_invalid_cdb_field;
|
|
}
|
|
|
|
cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
|
|
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
|
|
|
|
if (target_check_write_same_discard(&cdb[1], dev) < 0)
|
|
goto out_unsupported_cdb;
|
|
if (!passthrough)
|
|
cmd->execute_task = target_emulate_write_same;
|
|
break;
|
|
case WRITE_SAME:
|
|
sectors = transport_get_sectors_10(cdb, cmd, §or_ret);
|
|
if (sector_ret)
|
|
goto out_unsupported_cdb;
|
|
|
|
if (sectors)
|
|
size = transport_get_size(1, cdb, cmd);
|
|
else {
|
|
pr_err("WSNZ=1, WRITE_SAME w/sectors=0 not supported\n");
|
|
goto out_invalid_cdb_field;
|
|
}
|
|
|
|
cmd->t_task_lba = get_unaligned_be32(&cdb[2]);
|
|
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
|
|
/*
|
|
* Follow sbcr26 with WRITE_SAME (10) and check for the existence
|
|
* of byte 1 bit 3 UNMAP instead of original reserved field
|
|
*/
|
|
if (target_check_write_same_discard(&cdb[1], dev) < 0)
|
|
goto out_unsupported_cdb;
|
|
if (!passthrough)
|
|
cmd->execute_task = target_emulate_write_same;
|
|
break;
|
|
case ALLOW_MEDIUM_REMOVAL:
|
|
case ERASE:
|
|
case REZERO_UNIT:
|
|
case SEEK_10:
|
|
case SPACE:
|
|
case START_STOP:
|
|
case TEST_UNIT_READY:
|
|
case VERIFY:
|
|
case WRITE_FILEMARKS:
|
|
cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
|
|
if (!passthrough)
|
|
cmd->execute_task = target_emulate_noop;
|
|
break;
|
|
case GPCMD_CLOSE_TRACK:
|
|
case INITIALIZE_ELEMENT_STATUS:
|
|
case GPCMD_LOAD_UNLOAD:
|
|
case GPCMD_SET_SPEED:
|
|
case MOVE_MEDIUM:
|
|
cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB;
|
|
break;
|
|
case REPORT_LUNS:
|
|
cmd->execute_task = target_report_luns;
|
|
size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
|
|
/*
|
|
* Do implict HEAD_OF_QUEUE processing for REPORT_LUNS
|
|
* See spc4r17 section 5.3
|
|
*/
|
|
if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
|
|
cmd->sam_task_attr = MSG_HEAD_TAG;
|
|
cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB;
|
|
break;
|
|
default:
|
|
pr_warn("TARGET_CORE[%s]: Unsupported SCSI Opcode"
|
|
" 0x%02x, sending CHECK_CONDITION.\n",
|
|
cmd->se_tfo->get_fabric_name(), cdb[0]);
|
|
goto out_unsupported_cdb;
|
|
}
|
|
|
|
if (size != cmd->data_length) {
|
|
pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
|
|
" %u does not match SCSI CDB Length: %u for SAM Opcode:"
|
|
" 0x%02x\n", cmd->se_tfo->get_fabric_name(),
|
|
cmd->data_length, size, cdb[0]);
|
|
|
|
cmd->cmd_spdtl = size;
|
|
|
|
if (cmd->data_direction == DMA_TO_DEVICE) {
|
|
pr_err("Rejecting underflow/overflow"
|
|
" WRITE data\n");
|
|
goto out_invalid_cdb_field;
|
|
}
|
|
/*
|
|
* Reject READ_* or WRITE_* with overflow/underflow for
|
|
* type SCF_SCSI_DATA_SG_IO_CDB.
|
|
*/
|
|
if (!ret && (dev->se_sub_dev->se_dev_attrib.block_size != 512)) {
|
|
pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
|
|
" CDB on non 512-byte sector setup subsystem"
|
|
" plugin: %s\n", dev->transport->name);
|
|
/* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
|
|
goto out_invalid_cdb_field;
|
|
}
|
|
|
|
if (size > cmd->data_length) {
|
|
cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
|
|
cmd->residual_count = (size - cmd->data_length);
|
|
} else {
|
|
cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
|
|
cmd->residual_count = (cmd->data_length - size);
|
|
}
|
|
cmd->data_length = size;
|
|
}
|
|
|
|
if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB &&
|
|
sectors > dev->se_sub_dev->se_dev_attrib.fabric_max_sectors) {
|
|
printk_ratelimited(KERN_ERR "SCSI OP %02xh with too big sectors %u\n",
|
|
cdb[0], sectors);
|
|
goto out_invalid_cdb_field;
|
|
}
|
|
|
|
/* reject any command that we don't have a handler for */
|
|
if (!(passthrough || cmd->execute_task ||
|
|
(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)))
|
|
goto out_unsupported_cdb;
|
|
|
|
transport_set_supported_SAM_opcode(cmd);
|
|
return ret;
|
|
|
|
out_unsupported_cdb:
|
|
cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
|
|
cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
|
|
return -EINVAL;
|
|
out_invalid_cdb_field:
|
|
cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
|
|
cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Called from I/O completion to determine which dormant/delayed
|
|
* and ordered cmds need to have their tasks added to the execution queue.
|
|
*/
|
|
static void transport_complete_task_attr(struct se_cmd *cmd)
|
|
{
|
|
struct se_device *dev = cmd->se_dev;
|
|
struct se_cmd *cmd_p, *cmd_tmp;
|
|
int new_active_tasks = 0;
|
|
|
|
if (cmd->sam_task_attr == MSG_SIMPLE_TAG) {
|
|
atomic_dec(&dev->simple_cmds);
|
|
smp_mb__after_atomic_dec();
|
|
dev->dev_cur_ordered_id++;
|
|
pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
|
|
" SIMPLE: %u\n", dev->dev_cur_ordered_id,
|
|
cmd->se_ordered_id);
|
|
} else if (cmd->sam_task_attr == MSG_HEAD_TAG) {
|
|
dev->dev_cur_ordered_id++;
|
|
pr_debug("Incremented dev_cur_ordered_id: %u for"
|
|
" HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
|
|
cmd->se_ordered_id);
|
|
} else if (cmd->sam_task_attr == MSG_ORDERED_TAG) {
|
|
atomic_dec(&dev->dev_ordered_sync);
|
|
smp_mb__after_atomic_dec();
|
|
|
|
dev->dev_cur_ordered_id++;
|
|
pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
|
|
" %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
|
|
}
|
|
/*
|
|
* Process all commands up to the last received
|
|
* ORDERED task attribute which requires another blocking
|
|
* boundary
|
|
*/
|
|
spin_lock(&dev->delayed_cmd_lock);
|
|
list_for_each_entry_safe(cmd_p, cmd_tmp,
|
|
&dev->delayed_cmd_list, se_delayed_node) {
|
|
|
|
list_del(&cmd_p->se_delayed_node);
|
|
spin_unlock(&dev->delayed_cmd_lock);
|
|
|
|
pr_debug("Calling add_tasks() for"
|
|
" cmd_p: 0x%02x Task Attr: 0x%02x"
|
|
" Dormant -> Active, se_ordered_id: %u\n",
|
|
cmd_p->t_task_cdb[0],
|
|
cmd_p->sam_task_attr, cmd_p->se_ordered_id);
|
|
|
|
transport_add_tasks_from_cmd(cmd_p);
|
|
new_active_tasks++;
|
|
|
|
spin_lock(&dev->delayed_cmd_lock);
|
|
if (cmd_p->sam_task_attr == MSG_ORDERED_TAG)
|
|
break;
|
|
}
|
|
spin_unlock(&dev->delayed_cmd_lock);
|
|
/*
|
|
* If new tasks have become active, wake up the transport thread
|
|
* to do the processing of the Active tasks.
|
|
*/
|
|
if (new_active_tasks != 0)
|
|
wake_up_interruptible(&dev->dev_queue_obj.thread_wq);
|
|
}
|
|
|
|
static void transport_complete_qf(struct se_cmd *cmd)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
|
|
transport_complete_task_attr(cmd);
|
|
|
|
if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
|
|
ret = cmd->se_tfo->queue_status(cmd);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
switch (cmd->data_direction) {
|
|
case DMA_FROM_DEVICE:
|
|
ret = cmd->se_tfo->queue_data_in(cmd);
|
|
break;
|
|
case DMA_TO_DEVICE:
|
|
if (cmd->t_bidi_data_sg) {
|
|
ret = cmd->se_tfo->queue_data_in(cmd);
|
|
if (ret < 0)
|
|
break;
|
|
}
|
|
/* Fall through for DMA_TO_DEVICE */
|
|
case DMA_NONE:
|
|
ret = cmd->se_tfo->queue_status(cmd);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
out:
|
|
if (ret < 0) {
|
|
transport_handle_queue_full(cmd, cmd->se_dev);
|
|
return;
|
|
}
|
|
transport_lun_remove_cmd(cmd);
|
|
transport_cmd_check_stop_to_fabric(cmd);
|
|
}
|
|
|
|
static void transport_handle_queue_full(
|
|
struct se_cmd *cmd,
|
|
struct se_device *dev)
|
|
{
|
|
spin_lock_irq(&dev->qf_cmd_lock);
|
|
list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
|
|
atomic_inc(&dev->dev_qf_count);
|
|
smp_mb__after_atomic_inc();
|
|
spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
|
|
|
|
schedule_work(&cmd->se_dev->qf_work_queue);
|
|
}
|
|
|
|
static void target_complete_ok_work(struct work_struct *work)
|
|
{
|
|
struct se_cmd *cmd = container_of(work, struct se_cmd, work);
|
|
int reason = 0, ret;
|
|
|
|
/*
|
|
* Check if we need to move delayed/dormant tasks from cmds on the
|
|
* delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
|
|
* Attribute.
|
|
*/
|
|
if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED)
|
|
transport_complete_task_attr(cmd);
|
|
/*
|
|
* Check to schedule QUEUE_FULL work, or execute an existing
|
|
* cmd->transport_qf_callback()
|
|
*/
|
|
if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
|
|
schedule_work(&cmd->se_dev->qf_work_queue);
|
|
|
|
/*
|
|
* Check if we need to retrieve a sense buffer from
|
|
* the struct se_cmd in question.
|
|
*/
|
|
if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
|
|
if (transport_get_sense_data(cmd) < 0)
|
|
reason = TCM_NON_EXISTENT_LUN;
|
|
|
|
/*
|
|
* Only set when an struct se_task->task_scsi_status returned
|
|
* a non GOOD status.
|
|
*/
|
|
if (cmd->scsi_status) {
|
|
ret = transport_send_check_condition_and_sense(
|
|
cmd, reason, 1);
|
|
if (ret == -EAGAIN || ret == -ENOMEM)
|
|
goto queue_full;
|
|
|
|
transport_lun_remove_cmd(cmd);
|
|
transport_cmd_check_stop_to_fabric(cmd);
|
|
return;
|
|
}
|
|
}
|
|
/*
|
|
* Check for a callback, used by amongst other things
|
|
* XDWRITE_READ_10 emulation.
|
|
*/
|
|
if (cmd->transport_complete_callback)
|
|
cmd->transport_complete_callback(cmd);
|
|
|
|
switch (cmd->data_direction) {
|
|
case DMA_FROM_DEVICE:
|
|
spin_lock(&cmd->se_lun->lun_sep_lock);
|
|
if (cmd->se_lun->lun_sep) {
|
|
cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
|
|
cmd->data_length;
|
|
}
|
|
spin_unlock(&cmd->se_lun->lun_sep_lock);
|
|
|
|
ret = cmd->se_tfo->queue_data_in(cmd);
|
|
if (ret == -EAGAIN || ret == -ENOMEM)
|
|
goto queue_full;
|
|
break;
|
|
case DMA_TO_DEVICE:
|
|
spin_lock(&cmd->se_lun->lun_sep_lock);
|
|
if (cmd->se_lun->lun_sep) {
|
|
cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
|
|
cmd->data_length;
|
|
}
|
|
spin_unlock(&cmd->se_lun->lun_sep_lock);
|
|
/*
|
|
* Check if we need to send READ payload for BIDI-COMMAND
|
|
*/
|
|
if (cmd->t_bidi_data_sg) {
|
|
spin_lock(&cmd->se_lun->lun_sep_lock);
|
|
if (cmd->se_lun->lun_sep) {
|
|
cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
|
|
cmd->data_length;
|
|
}
|
|
spin_unlock(&cmd->se_lun->lun_sep_lock);
|
|
ret = cmd->se_tfo->queue_data_in(cmd);
|
|
if (ret == -EAGAIN || ret == -ENOMEM)
|
|
goto queue_full;
|
|
break;
|
|
}
|
|
/* Fall through for DMA_TO_DEVICE */
|
|
case DMA_NONE:
|
|
ret = cmd->se_tfo->queue_status(cmd);
|
|
if (ret == -EAGAIN || ret == -ENOMEM)
|
|
goto queue_full;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
transport_lun_remove_cmd(cmd);
|
|
transport_cmd_check_stop_to_fabric(cmd);
|
|
return;
|
|
|
|
queue_full:
|
|
pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
|
|
" data_direction: %d\n", cmd, cmd->data_direction);
|
|
cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
|
|
transport_handle_queue_full(cmd, cmd->se_dev);
|
|
}
|
|
|
|
static void transport_free_dev_tasks(struct se_cmd *cmd)
|
|
{
|
|
struct se_task *task, *task_tmp;
|
|
unsigned long flags;
|
|
LIST_HEAD(dispose_list);
|
|
|
|
spin_lock_irqsave(&cmd->t_state_lock, flags);
|
|
list_for_each_entry_safe(task, task_tmp,
|
|
&cmd->t_task_list, t_list) {
|
|
if (!(task->task_flags & TF_ACTIVE))
|
|
list_move_tail(&task->t_list, &dispose_list);
|
|
}
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
|
|
while (!list_empty(&dispose_list)) {
|
|
task = list_first_entry(&dispose_list, struct se_task, t_list);
|
|
|
|
if (task->task_sg != cmd->t_data_sg &&
|
|
task->task_sg != cmd->t_bidi_data_sg)
|
|
kfree(task->task_sg);
|
|
|
|
list_del(&task->t_list);
|
|
|
|
cmd->se_dev->transport->free_task(task);
|
|
}
|
|
}
|
|
|
|
static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
|
|
{
|
|
struct scatterlist *sg;
|
|
int count;
|
|
|
|
for_each_sg(sgl, sg, nents, count)
|
|
__free_page(sg_page(sg));
|
|
|
|
kfree(sgl);
|
|
}
|
|
|
|
static inline void transport_free_pages(struct se_cmd *cmd)
|
|
{
|
|
if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)
|
|
return;
|
|
|
|
transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
|
|
cmd->t_data_sg = NULL;
|
|
cmd->t_data_nents = 0;
|
|
|
|
transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
|
|
cmd->t_bidi_data_sg = NULL;
|
|
cmd->t_bidi_data_nents = 0;
|
|
}
|
|
|
|
/**
|
|
* transport_release_cmd - free a command
|
|
* @cmd: command to free
|
|
*
|
|
* This routine unconditionally frees a command, and reference counting
|
|
* or list removal must be done in the caller.
|
|
*/
|
|
static void transport_release_cmd(struct se_cmd *cmd)
|
|
{
|
|
BUG_ON(!cmd->se_tfo);
|
|
|
|
if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
|
|
core_tmr_release_req(cmd->se_tmr_req);
|
|
if (cmd->t_task_cdb != cmd->__t_task_cdb)
|
|
kfree(cmd->t_task_cdb);
|
|
/*
|
|
* If this cmd has been setup with target_get_sess_cmd(), drop
|
|
* the kref and call ->release_cmd() in kref callback.
|
|
*/
|
|
if (cmd->check_release != 0) {
|
|
target_put_sess_cmd(cmd->se_sess, cmd);
|
|
return;
|
|
}
|
|
cmd->se_tfo->release_cmd(cmd);
|
|
}
|
|
|
|
/**
|
|
* transport_put_cmd - release a reference to a command
|
|
* @cmd: command to release
|
|
*
|
|
* This routine releases our reference to the command and frees it if possible.
|
|
*/
|
|
static void transport_put_cmd(struct se_cmd *cmd)
|
|
{
|
|
unsigned long flags;
|
|
int free_tasks = 0;
|
|
|
|
spin_lock_irqsave(&cmd->t_state_lock, flags);
|
|
if (atomic_read(&cmd->t_fe_count)) {
|
|
if (!atomic_dec_and_test(&cmd->t_fe_count))
|
|
goto out_busy;
|
|
}
|
|
|
|
if (atomic_read(&cmd->t_se_count)) {
|
|
if (!atomic_dec_and_test(&cmd->t_se_count))
|
|
goto out_busy;
|
|
}
|
|
|
|
if (cmd->transport_state & CMD_T_DEV_ACTIVE) {
|
|
cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
|
|
transport_all_task_dev_remove_state(cmd);
|
|
free_tasks = 1;
|
|
}
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
|
|
if (free_tasks != 0)
|
|
transport_free_dev_tasks(cmd);
|
|
|
|
transport_free_pages(cmd);
|
|
transport_release_cmd(cmd);
|
|
return;
|
|
out_busy:
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* transport_generic_map_mem_to_cmd - Use fabric-alloced pages instead of
|
|
* allocating in the core.
|
|
* @cmd: Associated se_cmd descriptor
|
|
* @mem: SGL style memory for TCM WRITE / READ
|
|
* @sg_mem_num: Number of SGL elements
|
|
* @mem_bidi_in: SGL style memory for TCM BIDI READ
|
|
* @sg_mem_bidi_num: Number of BIDI READ SGL elements
|
|
*
|
|
* Return: nonzero return cmd was rejected for -ENOMEM or inproper usage
|
|
* of parameters.
|
|
*/
|
|
int transport_generic_map_mem_to_cmd(
|
|
struct se_cmd *cmd,
|
|
struct scatterlist *sgl,
|
|
u32 sgl_count,
|
|
struct scatterlist *sgl_bidi,
|
|
u32 sgl_bidi_count)
|
|
{
|
|
if (!sgl || !sgl_count)
|
|
return 0;
|
|
|
|
if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) ||
|
|
(cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) {
|
|
/*
|
|
* Reject SCSI data overflow with map_mem_to_cmd() as incoming
|
|
* scatterlists already have been set to follow what the fabric
|
|
* passes for the original expected data transfer length.
|
|
*/
|
|
if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
|
|
pr_warn("Rejecting SCSI DATA overflow for fabric using"
|
|
" SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
|
|
cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
|
|
cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD;
|
|
return -EINVAL;
|
|
}
|
|
|
|
cmd->t_data_sg = sgl;
|
|
cmd->t_data_nents = sgl_count;
|
|
|
|
if (sgl_bidi && sgl_bidi_count) {
|
|
cmd->t_bidi_data_sg = sgl_bidi;
|
|
cmd->t_bidi_data_nents = sgl_bidi_count;
|
|
}
|
|
cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(transport_generic_map_mem_to_cmd);
|
|
|
|
void *transport_kmap_data_sg(struct se_cmd *cmd)
|
|
{
|
|
struct scatterlist *sg = cmd->t_data_sg;
|
|
struct page **pages;
|
|
int i;
|
|
|
|
BUG_ON(!sg);
|
|
/*
|
|
* We need to take into account a possible offset here for fabrics like
|
|
* tcm_loop who may be using a contig buffer from the SCSI midlayer for
|
|
* control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
|
|
*/
|
|
if (!cmd->t_data_nents)
|
|
return NULL;
|
|
else if (cmd->t_data_nents == 1)
|
|
return kmap(sg_page(sg)) + sg->offset;
|
|
|
|
/* >1 page. use vmap */
|
|
pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
|
|
if (!pages)
|
|
return NULL;
|
|
|
|
/* convert sg[] to pages[] */
|
|
for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
|
|
pages[i] = sg_page(sg);
|
|
}
|
|
|
|
cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
|
|
kfree(pages);
|
|
if (!cmd->t_data_vmap)
|
|
return NULL;
|
|
|
|
return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
|
|
}
|
|
EXPORT_SYMBOL(transport_kmap_data_sg);
|
|
|
|
void transport_kunmap_data_sg(struct se_cmd *cmd)
|
|
{
|
|
if (!cmd->t_data_nents) {
|
|
return;
|
|
} else if (cmd->t_data_nents == 1) {
|
|
kunmap(sg_page(cmd->t_data_sg));
|
|
return;
|
|
}
|
|
|
|
vunmap(cmd->t_data_vmap);
|
|
cmd->t_data_vmap = NULL;
|
|
}
|
|
EXPORT_SYMBOL(transport_kunmap_data_sg);
|
|
|
|
static int
|
|
transport_generic_get_mem(struct se_cmd *cmd)
|
|
{
|
|
u32 length = cmd->data_length;
|
|
unsigned int nents;
|
|
struct page *page;
|
|
gfp_t zero_flag;
|
|
int i = 0;
|
|
|
|
nents = DIV_ROUND_UP(length, PAGE_SIZE);
|
|
cmd->t_data_sg = kmalloc(sizeof(struct scatterlist) * nents, GFP_KERNEL);
|
|
if (!cmd->t_data_sg)
|
|
return -ENOMEM;
|
|
|
|
cmd->t_data_nents = nents;
|
|
sg_init_table(cmd->t_data_sg, nents);
|
|
|
|
zero_flag = cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB ? 0 : __GFP_ZERO;
|
|
|
|
while (length) {
|
|
u32 page_len = min_t(u32, length, PAGE_SIZE);
|
|
page = alloc_page(GFP_KERNEL | zero_flag);
|
|
if (!page)
|
|
goto out;
|
|
|
|
sg_set_page(&cmd->t_data_sg[i], page, page_len, 0);
|
|
length -= page_len;
|
|
i++;
|
|
}
|
|
return 0;
|
|
|
|
out:
|
|
while (i >= 0) {
|
|
__free_page(sg_page(&cmd->t_data_sg[i]));
|
|
i--;
|
|
}
|
|
kfree(cmd->t_data_sg);
|
|
cmd->t_data_sg = NULL;
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* Reduce sectors if they are too long for the device */
|
|
static inline sector_t transport_limit_task_sectors(
|
|
struct se_device *dev,
|
|
unsigned long long lba,
|
|
sector_t sectors)
|
|
{
|
|
sectors = min_t(sector_t, sectors, dev->se_sub_dev->se_dev_attrib.max_sectors);
|
|
|
|
if (dev->transport->get_device_type(dev) == TYPE_DISK)
|
|
if ((lba + sectors) > transport_dev_end_lba(dev))
|
|
sectors = ((transport_dev_end_lba(dev) - lba) + 1);
|
|
|
|
return sectors;
|
|
}
|
|
|
|
|
|
/*
|
|
* This function can be used by HW target mode drivers to create a linked
|
|
* scatterlist from all contiguously allocated struct se_task->task_sg[].
|
|
* This is intended to be called during the completion path by TCM Core
|
|
* when struct target_core_fabric_ops->check_task_sg_chaining is enabled.
|
|
*/
|
|
void transport_do_task_sg_chain(struct se_cmd *cmd)
|
|
{
|
|
struct scatterlist *sg_first = NULL;
|
|
struct scatterlist *sg_prev = NULL;
|
|
int sg_prev_nents = 0;
|
|
struct scatterlist *sg;
|
|
struct se_task *task;
|
|
u32 chained_nents = 0;
|
|
int i;
|
|
|
|
BUG_ON(!cmd->se_tfo->task_sg_chaining);
|
|
|
|
/*
|
|
* Walk the struct se_task list and setup scatterlist chains
|
|
* for each contiguously allocated struct se_task->task_sg[].
|
|
*/
|
|
list_for_each_entry(task, &cmd->t_task_list, t_list) {
|
|
if (!task->task_sg)
|
|
continue;
|
|
|
|
if (!sg_first) {
|
|
sg_first = task->task_sg;
|
|
chained_nents = task->task_sg_nents;
|
|
} else {
|
|
sg_chain(sg_prev, sg_prev_nents, task->task_sg);
|
|
chained_nents += task->task_sg_nents;
|
|
}
|
|
/*
|
|
* For the padded tasks, use the extra SGL vector allocated
|
|
* in transport_allocate_data_tasks() for the sg_prev_nents
|
|
* offset into sg_chain() above.
|
|
*
|
|
* We do not need the padding for the last task (or a single
|
|
* task), but in that case we will never use the sg_prev_nents
|
|
* value below which would be incorrect.
|
|
*/
|
|
sg_prev_nents = (task->task_sg_nents + 1);
|
|
sg_prev = task->task_sg;
|
|
}
|
|
/*
|
|
* Setup the starting pointer and total t_tasks_sg_linked_no including
|
|
* padding SGs for linking and to mark the end.
|
|
*/
|
|
cmd->t_tasks_sg_chained = sg_first;
|
|
cmd->t_tasks_sg_chained_no = chained_nents;
|
|
|
|
pr_debug("Setup cmd: %p cmd->t_tasks_sg_chained: %p and"
|
|
" t_tasks_sg_chained_no: %u\n", cmd, cmd->t_tasks_sg_chained,
|
|
cmd->t_tasks_sg_chained_no);
|
|
|
|
for_each_sg(cmd->t_tasks_sg_chained, sg,
|
|
cmd->t_tasks_sg_chained_no, i) {
|
|
|
|
pr_debug("SG[%d]: %p page: %p length: %d offset: %d\n",
|
|
i, sg, sg_page(sg), sg->length, sg->offset);
|
|
if (sg_is_chain(sg))
|
|
pr_debug("SG: %p sg_is_chain=1\n", sg);
|
|
if (sg_is_last(sg))
|
|
pr_debug("SG: %p sg_is_last=1\n", sg);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(transport_do_task_sg_chain);
|
|
|
|
/*
|
|
* Break up cmd into chunks transport can handle
|
|
*/
|
|
static int
|
|
transport_allocate_data_tasks(struct se_cmd *cmd,
|
|
enum dma_data_direction data_direction,
|
|
struct scatterlist *cmd_sg, unsigned int sgl_nents)
|
|
{
|
|
struct se_device *dev = cmd->se_dev;
|
|
int task_count, i;
|
|
unsigned long long lba;
|
|
sector_t sectors, dev_max_sectors;
|
|
u32 sector_size;
|
|
|
|
if (transport_cmd_get_valid_sectors(cmd) < 0)
|
|
return -EINVAL;
|
|
|
|
dev_max_sectors = dev->se_sub_dev->se_dev_attrib.max_sectors;
|
|
sector_size = dev->se_sub_dev->se_dev_attrib.block_size;
|
|
|
|
WARN_ON(cmd->data_length % sector_size);
|
|
|
|
lba = cmd->t_task_lba;
|
|
sectors = DIV_ROUND_UP(cmd->data_length, sector_size);
|
|
task_count = DIV_ROUND_UP_SECTOR_T(sectors, dev_max_sectors);
|
|
|
|
/*
|
|
* If we need just a single task reuse the SG list in the command
|
|
* and avoid a lot of work.
|
|
*/
|
|
if (task_count == 1) {
|
|
struct se_task *task;
|
|
unsigned long flags;
|
|
|
|
task = transport_generic_get_task(cmd, data_direction);
|
|
if (!task)
|
|
return -ENOMEM;
|
|
|
|
task->task_sg = cmd_sg;
|
|
task->task_sg_nents = sgl_nents;
|
|
|
|
task->task_lba = lba;
|
|
task->task_sectors = sectors;
|
|
task->task_size = task->task_sectors * sector_size;
|
|
|
|
spin_lock_irqsave(&cmd->t_state_lock, flags);
|
|
list_add_tail(&task->t_list, &cmd->t_task_list);
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
|
|
return task_count;
|
|
}
|
|
|
|
for (i = 0; i < task_count; i++) {
|
|
struct se_task *task;
|
|
unsigned int task_size, task_sg_nents_padded;
|
|
struct scatterlist *sg;
|
|
unsigned long flags;
|
|
int count;
|
|
|
|
task = transport_generic_get_task(cmd, data_direction);
|
|
if (!task)
|
|
return -ENOMEM;
|
|
|
|
task->task_lba = lba;
|
|
task->task_sectors = min(sectors, dev_max_sectors);
|
|
task->task_size = task->task_sectors * sector_size;
|
|
|
|
/*
|
|
* This now assumes that passed sg_ents are in PAGE_SIZE chunks
|
|
* in order to calculate the number per task SGL entries
|
|
*/
|
|
task->task_sg_nents = DIV_ROUND_UP(task->task_size, PAGE_SIZE);
|
|
/*
|
|
* Check if the fabric module driver is requesting that all
|
|
* struct se_task->task_sg[] be chained together.. If so,
|
|
* then allocate an extra padding SG entry for linking and
|
|
* marking the end of the chained SGL for every task except
|
|
* the last one for (task_count > 1) operation, or skipping
|
|
* the extra padding for the (task_count == 1) case.
|
|
*/
|
|
if (cmd->se_tfo->task_sg_chaining && (i < (task_count - 1))) {
|
|
task_sg_nents_padded = (task->task_sg_nents + 1);
|
|
} else
|
|
task_sg_nents_padded = task->task_sg_nents;
|
|
|
|
task->task_sg = kmalloc(sizeof(struct scatterlist) *
|
|
task_sg_nents_padded, GFP_KERNEL);
|
|
if (!task->task_sg) {
|
|
cmd->se_dev->transport->free_task(task);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
sg_init_table(task->task_sg, task_sg_nents_padded);
|
|
|
|
task_size = task->task_size;
|
|
|
|
/* Build new sgl, only up to task_size */
|
|
for_each_sg(task->task_sg, sg, task->task_sg_nents, count) {
|
|
if (cmd_sg->length > task_size)
|
|
break;
|
|
|
|
*sg = *cmd_sg;
|
|
task_size -= cmd_sg->length;
|
|
cmd_sg = sg_next(cmd_sg);
|
|
}
|
|
|
|
lba += task->task_sectors;
|
|
sectors -= task->task_sectors;
|
|
|
|
spin_lock_irqsave(&cmd->t_state_lock, flags);
|
|
list_add_tail(&task->t_list, &cmd->t_task_list);
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
}
|
|
|
|
return task_count;
|
|
}
|
|
|
|
static int
|
|
transport_allocate_control_task(struct se_cmd *cmd)
|
|
{
|
|
struct se_task *task;
|
|
unsigned long flags;
|
|
|
|
/* Workaround for handling zero-length control CDBs */
|
|
if ((cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) &&
|
|
!cmd->data_length)
|
|
return 0;
|
|
|
|
task = transport_generic_get_task(cmd, cmd->data_direction);
|
|
if (!task)
|
|
return -ENOMEM;
|
|
|
|
task->task_sg = cmd->t_data_sg;
|
|
task->task_size = cmd->data_length;
|
|
task->task_sg_nents = cmd->t_data_nents;
|
|
|
|
spin_lock_irqsave(&cmd->t_state_lock, flags);
|
|
list_add_tail(&task->t_list, &cmd->t_task_list);
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
|
|
/* Success! Return number of tasks allocated */
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Allocate any required ressources to execute the command, and either place
|
|
* it on the execution queue if possible. For writes we might not have the
|
|
* payload yet, thus notify the fabric via a call to ->write_pending instead.
|
|
*/
|
|
int transport_generic_new_cmd(struct se_cmd *cmd)
|
|
{
|
|
struct se_device *dev = cmd->se_dev;
|
|
int task_cdbs, task_cdbs_bidi = 0;
|
|
int set_counts = 1;
|
|
int ret = 0;
|
|
|
|
/*
|
|
* Determine is the TCM fabric module has already allocated physical
|
|
* memory, and is directly calling transport_generic_map_mem_to_cmd()
|
|
* beforehand.
|
|
*/
|
|
if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
|
|
cmd->data_length) {
|
|
ret = transport_generic_get_mem(cmd);
|
|
if (ret < 0)
|
|
goto out_fail;
|
|
}
|
|
|
|
/*
|
|
* For BIDI command set up the read tasks first.
|
|
*/
|
|
if (cmd->t_bidi_data_sg &&
|
|
dev->transport->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) {
|
|
BUG_ON(!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB));
|
|
|
|
task_cdbs_bidi = transport_allocate_data_tasks(cmd,
|
|
DMA_FROM_DEVICE, cmd->t_bidi_data_sg,
|
|
cmd->t_bidi_data_nents);
|
|
if (task_cdbs_bidi <= 0)
|
|
goto out_fail;
|
|
|
|
atomic_inc(&cmd->t_fe_count);
|
|
atomic_inc(&cmd->t_se_count);
|
|
set_counts = 0;
|
|
}
|
|
|
|
if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
|
|
task_cdbs = transport_allocate_data_tasks(cmd,
|
|
cmd->data_direction, cmd->t_data_sg,
|
|
cmd->t_data_nents);
|
|
} else {
|
|
task_cdbs = transport_allocate_control_task(cmd);
|
|
}
|
|
|
|
if (task_cdbs < 0)
|
|
goto out_fail;
|
|
else if (!task_cdbs && (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) {
|
|
spin_lock_irq(&cmd->t_state_lock);
|
|
cmd->t_state = TRANSPORT_COMPLETE;
|
|
cmd->transport_state |= CMD_T_ACTIVE;
|
|
spin_unlock_irq(&cmd->t_state_lock);
|
|
|
|
if (cmd->t_task_cdb[0] == REQUEST_SENSE) {
|
|
u8 ua_asc = 0, ua_ascq = 0;
|
|
|
|
core_scsi3_ua_clear_for_request_sense(cmd,
|
|
&ua_asc, &ua_ascq);
|
|
}
|
|
|
|
INIT_WORK(&cmd->work, target_complete_ok_work);
|
|
queue_work(target_completion_wq, &cmd->work);
|
|
return 0;
|
|
}
|
|
|
|
if (set_counts) {
|
|
atomic_inc(&cmd->t_fe_count);
|
|
atomic_inc(&cmd->t_se_count);
|
|
}
|
|
|
|
cmd->t_task_list_num = (task_cdbs + task_cdbs_bidi);
|
|
atomic_set(&cmd->t_task_cdbs_left, cmd->t_task_list_num);
|
|
atomic_set(&cmd->t_task_cdbs_ex_left, cmd->t_task_list_num);
|
|
|
|
/*
|
|
* For WRITEs, let the fabric know its buffer is ready..
|
|
* This WRITE struct se_cmd (and all of its associated struct se_task's)
|
|
* will be added to the struct se_device execution queue after its WRITE
|
|
* data has arrived. (ie: It gets handled by the transport processing
|
|
* thread a second time)
|
|
*/
|
|
if (cmd->data_direction == DMA_TO_DEVICE) {
|
|
transport_add_tasks_to_state_queue(cmd);
|
|
return transport_generic_write_pending(cmd);
|
|
}
|
|
/*
|
|
* Everything else but a WRITE, add the struct se_cmd's struct se_task's
|
|
* to the execution queue.
|
|
*/
|
|
transport_execute_tasks(cmd);
|
|
return 0;
|
|
|
|
out_fail:
|
|
cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
|
|
cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
|
|
return -EINVAL;
|
|
}
|
|
EXPORT_SYMBOL(transport_generic_new_cmd);
|
|
|
|
/* transport_generic_process_write():
|
|
*
|
|
*
|
|
*/
|
|
void transport_generic_process_write(struct se_cmd *cmd)
|
|
{
|
|
transport_execute_tasks(cmd);
|
|
}
|
|
EXPORT_SYMBOL(transport_generic_process_write);
|
|
|
|
static void transport_write_pending_qf(struct se_cmd *cmd)
|
|
{
|
|
int ret;
|
|
|
|
ret = cmd->se_tfo->write_pending(cmd);
|
|
if (ret == -EAGAIN || ret == -ENOMEM) {
|
|
pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
|
|
cmd);
|
|
transport_handle_queue_full(cmd, cmd->se_dev);
|
|
}
|
|
}
|
|
|
|
static int transport_generic_write_pending(struct se_cmd *cmd)
|
|
{
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
spin_lock_irqsave(&cmd->t_state_lock, flags);
|
|
cmd->t_state = TRANSPORT_WRITE_PENDING;
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
|
|
/*
|
|
* Clear the se_cmd for WRITE_PENDING status in order to set
|
|
* CMD_T_ACTIVE so that transport_generic_handle_data can be called
|
|
* from HW target mode interrupt code. This is safe to be called
|
|
* with transport_off=1 before the cmd->se_tfo->write_pending
|
|
* because the se_cmd->se_lun pointer is not being cleared.
|
|
*/
|
|
transport_cmd_check_stop(cmd, 1, 0);
|
|
|
|
/*
|
|
* Call the fabric write_pending function here to let the
|
|
* frontend know that WRITE buffers are ready.
|
|
*/
|
|
ret = cmd->se_tfo->write_pending(cmd);
|
|
if (ret == -EAGAIN || ret == -ENOMEM)
|
|
goto queue_full;
|
|
else if (ret < 0)
|
|
return ret;
|
|
|
|
return 1;
|
|
|
|
queue_full:
|
|
pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
|
|
cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
|
|
transport_handle_queue_full(cmd, cmd->se_dev);
|
|
return 0;
|
|
}
|
|
|
|
void transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
|
|
{
|
|
if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
|
|
if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
|
|
transport_wait_for_tasks(cmd);
|
|
|
|
transport_release_cmd(cmd);
|
|
} else {
|
|
if (wait_for_tasks)
|
|
transport_wait_for_tasks(cmd);
|
|
|
|
core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd);
|
|
|
|
if (cmd->se_lun)
|
|
transport_lun_remove_cmd(cmd);
|
|
|
|
transport_free_dev_tasks(cmd);
|
|
|
|
transport_put_cmd(cmd);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(transport_generic_free_cmd);
|
|
|
|
/* target_get_sess_cmd - Add command to active ->sess_cmd_list
|
|
* @se_sess: session to reference
|
|
* @se_cmd: command descriptor to add
|
|
* @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
|
|
*/
|
|
void target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
|
|
bool ack_kref)
|
|
{
|
|
unsigned long flags;
|
|
|
|
kref_init(&se_cmd->cmd_kref);
|
|
/*
|
|
* Add a second kref if the fabric caller is expecting to handle
|
|
* fabric acknowledgement that requires two target_put_sess_cmd()
|
|
* invocations before se_cmd descriptor release.
|
|
*/
|
|
if (ack_kref == true) {
|
|
kref_get(&se_cmd->cmd_kref);
|
|
se_cmd->se_cmd_flags |= SCF_ACK_KREF;
|
|
}
|
|
|
|
spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
|
|
list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
|
|
se_cmd->check_release = 1;
|
|
spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
|
|
}
|
|
EXPORT_SYMBOL(target_get_sess_cmd);
|
|
|
|
static void target_release_cmd_kref(struct kref *kref)
|
|
{
|
|
struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
|
|
struct se_session *se_sess = se_cmd->se_sess;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
|
|
if (list_empty(&se_cmd->se_cmd_list)) {
|
|
spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
|
|
se_cmd->se_tfo->release_cmd(se_cmd);
|
|
return;
|
|
}
|
|
if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
|
|
spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
|
|
complete(&se_cmd->cmd_wait_comp);
|
|
return;
|
|
}
|
|
list_del(&se_cmd->se_cmd_list);
|
|
spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
|
|
|
|
se_cmd->se_tfo->release_cmd(se_cmd);
|
|
}
|
|
|
|
/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
|
|
* @se_sess: session to reference
|
|
* @se_cmd: command descriptor to drop
|
|
*/
|
|
int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
|
|
{
|
|
return kref_put(&se_cmd->cmd_kref, target_release_cmd_kref);
|
|
}
|
|
EXPORT_SYMBOL(target_put_sess_cmd);
|
|
|
|
/* target_splice_sess_cmd_list - Split active cmds into sess_wait_list
|
|
* @se_sess: session to split
|
|
*/
|
|
void target_splice_sess_cmd_list(struct se_session *se_sess)
|
|
{
|
|
struct se_cmd *se_cmd;
|
|
unsigned long flags;
|
|
|
|
WARN_ON(!list_empty(&se_sess->sess_wait_list));
|
|
INIT_LIST_HEAD(&se_sess->sess_wait_list);
|
|
|
|
spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
|
|
se_sess->sess_tearing_down = 1;
|
|
|
|
list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
|
|
|
|
list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
|
|
se_cmd->cmd_wait_set = 1;
|
|
|
|
spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
|
|
}
|
|
EXPORT_SYMBOL(target_splice_sess_cmd_list);
|
|
|
|
/* target_wait_for_sess_cmds - Wait for outstanding descriptors
|
|
* @se_sess: session to wait for active I/O
|
|
* @wait_for_tasks: Make extra transport_wait_for_tasks call
|
|
*/
|
|
void target_wait_for_sess_cmds(
|
|
struct se_session *se_sess,
|
|
int wait_for_tasks)
|
|
{
|
|
struct se_cmd *se_cmd, *tmp_cmd;
|
|
bool rc = false;
|
|
|
|
list_for_each_entry_safe(se_cmd, tmp_cmd,
|
|
&se_sess->sess_wait_list, se_cmd_list) {
|
|
list_del(&se_cmd->se_cmd_list);
|
|
|
|
pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
|
|
" %d\n", se_cmd, se_cmd->t_state,
|
|
se_cmd->se_tfo->get_cmd_state(se_cmd));
|
|
|
|
if (wait_for_tasks) {
|
|
pr_debug("Calling transport_wait_for_tasks se_cmd: %p t_state: %d,"
|
|
" fabric state: %d\n", se_cmd, se_cmd->t_state,
|
|
se_cmd->se_tfo->get_cmd_state(se_cmd));
|
|
|
|
rc = transport_wait_for_tasks(se_cmd);
|
|
|
|
pr_debug("After transport_wait_for_tasks se_cmd: %p t_state: %d,"
|
|
" fabric state: %d\n", se_cmd, se_cmd->t_state,
|
|
se_cmd->se_tfo->get_cmd_state(se_cmd));
|
|
}
|
|
|
|
if (!rc) {
|
|
wait_for_completion(&se_cmd->cmd_wait_comp);
|
|
pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
|
|
" fabric state: %d\n", se_cmd, se_cmd->t_state,
|
|
se_cmd->se_tfo->get_cmd_state(se_cmd));
|
|
}
|
|
|
|
se_cmd->se_tfo->release_cmd(se_cmd);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(target_wait_for_sess_cmds);
|
|
|
|
/* transport_lun_wait_for_tasks():
|
|
*
|
|
* Called from ConfigFS context to stop the passed struct se_cmd to allow
|
|
* an struct se_lun to be successfully shutdown.
|
|
*/
|
|
static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun)
|
|
{
|
|
unsigned long flags;
|
|
int ret;
|
|
/*
|
|
* If the frontend has already requested this struct se_cmd to
|
|
* be stopped, we can safely ignore this struct se_cmd.
|
|
*/
|
|
spin_lock_irqsave(&cmd->t_state_lock, flags);
|
|
if (cmd->transport_state & CMD_T_STOP) {
|
|
cmd->transport_state &= ~CMD_T_LUN_STOP;
|
|
|
|
pr_debug("ConfigFS ITT[0x%08x] - CMD_T_STOP, skipping\n",
|
|
cmd->se_tfo->get_task_tag(cmd));
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
transport_cmd_check_stop(cmd, 1, 0);
|
|
return -EPERM;
|
|
}
|
|
cmd->transport_state |= CMD_T_LUN_FE_STOP;
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
|
|
wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
|
|
|
|
ret = transport_stop_tasks_for_cmd(cmd);
|
|
|
|
pr_debug("ConfigFS: cmd: %p t_tasks: %d stop tasks ret:"
|
|
" %d\n", cmd, cmd->t_task_list_num, ret);
|
|
if (!ret) {
|
|
pr_debug("ConfigFS: ITT[0x%08x] - stopping cmd....\n",
|
|
cmd->se_tfo->get_task_tag(cmd));
|
|
wait_for_completion(&cmd->transport_lun_stop_comp);
|
|
pr_debug("ConfigFS: ITT[0x%08x] - stopped cmd....\n",
|
|
cmd->se_tfo->get_task_tag(cmd));
|
|
}
|
|
transport_remove_cmd_from_queue(cmd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __transport_clear_lun_from_sessions(struct se_lun *lun)
|
|
{
|
|
struct se_cmd *cmd = NULL;
|
|
unsigned long lun_flags, cmd_flags;
|
|
/*
|
|
* Do exception processing and return CHECK_CONDITION status to the
|
|
* Initiator Port.
|
|
*/
|
|
spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
|
|
while (!list_empty(&lun->lun_cmd_list)) {
|
|
cmd = list_first_entry(&lun->lun_cmd_list,
|
|
struct se_cmd, se_lun_node);
|
|
list_del_init(&cmd->se_lun_node);
|
|
|
|
/*
|
|
* This will notify iscsi_target_transport.c:
|
|
* transport_cmd_check_stop() that a LUN shutdown is in
|
|
* progress for the iscsi_cmd_t.
|
|
*/
|
|
spin_lock(&cmd->t_state_lock);
|
|
pr_debug("SE_LUN[%d] - Setting cmd->transport"
|
|
"_lun_stop for ITT: 0x%08x\n",
|
|
cmd->se_lun->unpacked_lun,
|
|
cmd->se_tfo->get_task_tag(cmd));
|
|
cmd->transport_state |= CMD_T_LUN_STOP;
|
|
spin_unlock(&cmd->t_state_lock);
|
|
|
|
spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
|
|
|
|
if (!cmd->se_lun) {
|
|
pr_err("ITT: 0x%08x, [i,t]_state: %u/%u\n",
|
|
cmd->se_tfo->get_task_tag(cmd),
|
|
cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
|
|
BUG();
|
|
}
|
|
/*
|
|
* If the Storage engine still owns the iscsi_cmd_t, determine
|
|
* and/or stop its context.
|
|
*/
|
|
pr_debug("SE_LUN[%d] - ITT: 0x%08x before transport"
|
|
"_lun_wait_for_tasks()\n", cmd->se_lun->unpacked_lun,
|
|
cmd->se_tfo->get_task_tag(cmd));
|
|
|
|
if (transport_lun_wait_for_tasks(cmd, cmd->se_lun) < 0) {
|
|
spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
|
|
continue;
|
|
}
|
|
|
|
pr_debug("SE_LUN[%d] - ITT: 0x%08x after transport_lun"
|
|
"_wait_for_tasks(): SUCCESS\n",
|
|
cmd->se_lun->unpacked_lun,
|
|
cmd->se_tfo->get_task_tag(cmd));
|
|
|
|
spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
|
|
if (!(cmd->transport_state & CMD_T_DEV_ACTIVE)) {
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
|
|
goto check_cond;
|
|
}
|
|
cmd->transport_state &= ~CMD_T_DEV_ACTIVE;
|
|
transport_all_task_dev_remove_state(cmd);
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
|
|
|
|
transport_free_dev_tasks(cmd);
|
|
/*
|
|
* The Storage engine stopped this struct se_cmd before it was
|
|
* send to the fabric frontend for delivery back to the
|
|
* Initiator Node. Return this SCSI CDB back with an
|
|
* CHECK_CONDITION status.
|
|
*/
|
|
check_cond:
|
|
transport_send_check_condition_and_sense(cmd,
|
|
TCM_NON_EXISTENT_LUN, 0);
|
|
/*
|
|
* If the fabric frontend is waiting for this iscsi_cmd_t to
|
|
* be released, notify the waiting thread now that LU has
|
|
* finished accessing it.
|
|
*/
|
|
spin_lock_irqsave(&cmd->t_state_lock, cmd_flags);
|
|
if (cmd->transport_state & CMD_T_LUN_FE_STOP) {
|
|
pr_debug("SE_LUN[%d] - Detected FE stop for"
|
|
" struct se_cmd: %p ITT: 0x%08x\n",
|
|
lun->unpacked_lun,
|
|
cmd, cmd->se_tfo->get_task_tag(cmd));
|
|
|
|
spin_unlock_irqrestore(&cmd->t_state_lock,
|
|
cmd_flags);
|
|
transport_cmd_check_stop(cmd, 1, 0);
|
|
complete(&cmd->transport_lun_fe_stop_comp);
|
|
spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
|
|
continue;
|
|
}
|
|
pr_debug("SE_LUN[%d] - ITT: 0x%08x finished processing\n",
|
|
lun->unpacked_lun, cmd->se_tfo->get_task_tag(cmd));
|
|
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, cmd_flags);
|
|
spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags);
|
|
}
|
|
spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags);
|
|
}
|
|
|
|
static int transport_clear_lun_thread(void *p)
|
|
{
|
|
struct se_lun *lun = p;
|
|
|
|
__transport_clear_lun_from_sessions(lun);
|
|
complete(&lun->lun_shutdown_comp);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int transport_clear_lun_from_sessions(struct se_lun *lun)
|
|
{
|
|
struct task_struct *kt;
|
|
|
|
kt = kthread_run(transport_clear_lun_thread, lun,
|
|
"tcm_cl_%u", lun->unpacked_lun);
|
|
if (IS_ERR(kt)) {
|
|
pr_err("Unable to start clear_lun thread\n");
|
|
return PTR_ERR(kt);
|
|
}
|
|
wait_for_completion(&lun->lun_shutdown_comp);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* transport_wait_for_tasks - wait for completion to occur
|
|
* @cmd: command to wait
|
|
*
|
|
* Called from frontend fabric context to wait for storage engine
|
|
* to pause and/or release frontend generated struct se_cmd.
|
|
*/
|
|
bool transport_wait_for_tasks(struct se_cmd *cmd)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&cmd->t_state_lock, flags);
|
|
if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
|
|
!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
return false;
|
|
}
|
|
/*
|
|
* Only perform a possible wait_for_tasks if SCF_SUPPORTED_SAM_OPCODE
|
|
* has been set in transport_set_supported_SAM_opcode().
|
|
*/
|
|
if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
|
|
!(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
return false;
|
|
}
|
|
/*
|
|
* If we are already stopped due to an external event (ie: LUN shutdown)
|
|
* sleep until the connection can have the passed struct se_cmd back.
|
|
* The cmd->transport_lun_stopped_sem will be upped by
|
|
* transport_clear_lun_from_sessions() once the ConfigFS context caller
|
|
* has completed its operation on the struct se_cmd.
|
|
*/
|
|
if (cmd->transport_state & CMD_T_LUN_STOP) {
|
|
pr_debug("wait_for_tasks: Stopping"
|
|
" wait_for_completion(&cmd->t_tasktransport_lun_fe"
|
|
"_stop_comp); for ITT: 0x%08x\n",
|
|
cmd->se_tfo->get_task_tag(cmd));
|
|
/*
|
|
* There is a special case for WRITES where a FE exception +
|
|
* LUN shutdown means ConfigFS context is still sleeping on
|
|
* transport_lun_stop_comp in transport_lun_wait_for_tasks().
|
|
* We go ahead and up transport_lun_stop_comp just to be sure
|
|
* here.
|
|
*/
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
complete(&cmd->transport_lun_stop_comp);
|
|
wait_for_completion(&cmd->transport_lun_fe_stop_comp);
|
|
spin_lock_irqsave(&cmd->t_state_lock, flags);
|
|
|
|
transport_all_task_dev_remove_state(cmd);
|
|
/*
|
|
* At this point, the frontend who was the originator of this
|
|
* struct se_cmd, now owns the structure and can be released through
|
|
* normal means below.
|
|
*/
|
|
pr_debug("wait_for_tasks: Stopped"
|
|
" wait_for_completion(&cmd->t_tasktransport_lun_fe_"
|
|
"stop_comp); for ITT: 0x%08x\n",
|
|
cmd->se_tfo->get_task_tag(cmd));
|
|
|
|
cmd->transport_state &= ~CMD_T_LUN_STOP;
|
|
}
|
|
|
|
if (!(cmd->transport_state & CMD_T_ACTIVE)) {
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
return false;
|
|
}
|
|
|
|
cmd->transport_state |= CMD_T_STOP;
|
|
|
|
pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
|
|
" i_state: %d, t_state: %d, CMD_T_STOP\n",
|
|
cmd, cmd->se_tfo->get_task_tag(cmd),
|
|
cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
|
|
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
|
|
wake_up_interruptible(&cmd->se_dev->dev_queue_obj.thread_wq);
|
|
|
|
wait_for_completion(&cmd->t_transport_stop_comp);
|
|
|
|
spin_lock_irqsave(&cmd->t_state_lock, flags);
|
|
cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
|
|
|
|
pr_debug("wait_for_tasks: Stopped wait_for_compltion("
|
|
"&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
|
|
cmd->se_tfo->get_task_tag(cmd));
|
|
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
|
|
return true;
|
|
}
|
|
EXPORT_SYMBOL(transport_wait_for_tasks);
|
|
|
|
static int transport_get_sense_codes(
|
|
struct se_cmd *cmd,
|
|
u8 *asc,
|
|
u8 *ascq)
|
|
{
|
|
*asc = cmd->scsi_asc;
|
|
*ascq = cmd->scsi_ascq;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int transport_set_sense_codes(
|
|
struct se_cmd *cmd,
|
|
u8 asc,
|
|
u8 ascq)
|
|
{
|
|
cmd->scsi_asc = asc;
|
|
cmd->scsi_ascq = ascq;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int transport_send_check_condition_and_sense(
|
|
struct se_cmd *cmd,
|
|
u8 reason,
|
|
int from_transport)
|
|
{
|
|
unsigned char *buffer = cmd->sense_buffer;
|
|
unsigned long flags;
|
|
int offset;
|
|
u8 asc = 0, ascq = 0;
|
|
|
|
spin_lock_irqsave(&cmd->t_state_lock, flags);
|
|
if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
return 0;
|
|
}
|
|
cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
|
|
if (!reason && from_transport)
|
|
goto after_reason;
|
|
|
|
if (!from_transport)
|
|
cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
|
|
/*
|
|
* Data Segment and SenseLength of the fabric response PDU.
|
|
*
|
|
* TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE
|
|
* from include/scsi/scsi_cmnd.h
|
|
*/
|
|
offset = cmd->se_tfo->set_fabric_sense_len(cmd,
|
|
TRANSPORT_SENSE_BUFFER);
|
|
/*
|
|
* Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
|
|
* SENSE KEY values from include/scsi/scsi.h
|
|
*/
|
|
switch (reason) {
|
|
case TCM_NON_EXISTENT_LUN:
|
|
/* CURRENT ERROR */
|
|
buffer[offset] = 0x70;
|
|
buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
|
|
/* ILLEGAL REQUEST */
|
|
buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
|
|
/* LOGICAL UNIT NOT SUPPORTED */
|
|
buffer[offset+SPC_ASC_KEY_OFFSET] = 0x25;
|
|
break;
|
|
case TCM_UNSUPPORTED_SCSI_OPCODE:
|
|
case TCM_SECTOR_COUNT_TOO_MANY:
|
|
/* CURRENT ERROR */
|
|
buffer[offset] = 0x70;
|
|
buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
|
|
/* ILLEGAL REQUEST */
|
|
buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
|
|
/* INVALID COMMAND OPERATION CODE */
|
|
buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20;
|
|
break;
|
|
case TCM_UNKNOWN_MODE_PAGE:
|
|
/* CURRENT ERROR */
|
|
buffer[offset] = 0x70;
|
|
buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
|
|
/* ILLEGAL REQUEST */
|
|
buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
|
|
/* INVALID FIELD IN CDB */
|
|
buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
|
|
break;
|
|
case TCM_CHECK_CONDITION_ABORT_CMD:
|
|
/* CURRENT ERROR */
|
|
buffer[offset] = 0x70;
|
|
buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
|
|
/* ABORTED COMMAND */
|
|
buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
|
|
/* BUS DEVICE RESET FUNCTION OCCURRED */
|
|
buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29;
|
|
buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03;
|
|
break;
|
|
case TCM_INCORRECT_AMOUNT_OF_DATA:
|
|
/* CURRENT ERROR */
|
|
buffer[offset] = 0x70;
|
|
buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
|
|
/* ABORTED COMMAND */
|
|
buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
|
|
/* WRITE ERROR */
|
|
buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
|
|
/* NOT ENOUGH UNSOLICITED DATA */
|
|
buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d;
|
|
break;
|
|
case TCM_INVALID_CDB_FIELD:
|
|
/* CURRENT ERROR */
|
|
buffer[offset] = 0x70;
|
|
buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
|
|
/* ILLEGAL REQUEST */
|
|
buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
|
|
/* INVALID FIELD IN CDB */
|
|
buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24;
|
|
break;
|
|
case TCM_INVALID_PARAMETER_LIST:
|
|
/* CURRENT ERROR */
|
|
buffer[offset] = 0x70;
|
|
buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
|
|
/* ILLEGAL REQUEST */
|
|
buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
|
|
/* INVALID FIELD IN PARAMETER LIST */
|
|
buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26;
|
|
break;
|
|
case TCM_UNEXPECTED_UNSOLICITED_DATA:
|
|
/* CURRENT ERROR */
|
|
buffer[offset] = 0x70;
|
|
buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
|
|
/* ABORTED COMMAND */
|
|
buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
|
|
/* WRITE ERROR */
|
|
buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c;
|
|
/* UNEXPECTED_UNSOLICITED_DATA */
|
|
buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c;
|
|
break;
|
|
case TCM_SERVICE_CRC_ERROR:
|
|
/* CURRENT ERROR */
|
|
buffer[offset] = 0x70;
|
|
buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
|
|
/* ABORTED COMMAND */
|
|
buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
|
|
/* PROTOCOL SERVICE CRC ERROR */
|
|
buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47;
|
|
/* N/A */
|
|
buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05;
|
|
break;
|
|
case TCM_SNACK_REJECTED:
|
|
/* CURRENT ERROR */
|
|
buffer[offset] = 0x70;
|
|
buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
|
|
/* ABORTED COMMAND */
|
|
buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
|
|
/* READ ERROR */
|
|
buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11;
|
|
/* FAILED RETRANSMISSION REQUEST */
|
|
buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13;
|
|
break;
|
|
case TCM_WRITE_PROTECTED:
|
|
/* CURRENT ERROR */
|
|
buffer[offset] = 0x70;
|
|
buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
|
|
/* DATA PROTECT */
|
|
buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
|
|
/* WRITE PROTECTED */
|
|
buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27;
|
|
break;
|
|
case TCM_CHECK_CONDITION_UNIT_ATTENTION:
|
|
/* CURRENT ERROR */
|
|
buffer[offset] = 0x70;
|
|
buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
|
|
/* UNIT ATTENTION */
|
|
buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
|
|
core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
|
|
buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
|
|
buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
|
|
break;
|
|
case TCM_CHECK_CONDITION_NOT_READY:
|
|
/* CURRENT ERROR */
|
|
buffer[offset] = 0x70;
|
|
buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
|
|
/* Not Ready */
|
|
buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY;
|
|
transport_get_sense_codes(cmd, &asc, &ascq);
|
|
buffer[offset+SPC_ASC_KEY_OFFSET] = asc;
|
|
buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq;
|
|
break;
|
|
case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
|
|
default:
|
|
/* CURRENT ERROR */
|
|
buffer[offset] = 0x70;
|
|
buffer[offset+SPC_ADD_SENSE_LEN_OFFSET] = 10;
|
|
/* ILLEGAL REQUEST */
|
|
buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
|
|
/* LOGICAL UNIT COMMUNICATION FAILURE */
|
|
buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80;
|
|
break;
|
|
}
|
|
/*
|
|
* This code uses linux/include/scsi/scsi.h SAM status codes!
|
|
*/
|
|
cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
|
|
/*
|
|
* Automatically padded, this value is encoded in the fabric's
|
|
* data_length response PDU containing the SCSI defined sense data.
|
|
*/
|
|
cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset;
|
|
|
|
after_reason:
|
|
return cmd->se_tfo->queue_status(cmd);
|
|
}
|
|
EXPORT_SYMBOL(transport_send_check_condition_and_sense);
|
|
|
|
int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (cmd->transport_state & CMD_T_ABORTED) {
|
|
if (!send_status ||
|
|
(cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS))
|
|
return 1;
|
|
#if 0
|
|
pr_debug("Sending delayed SAM_STAT_TASK_ABORTED"
|
|
" status for CDB: 0x%02x ITT: 0x%08x\n",
|
|
cmd->t_task_cdb[0],
|
|
cmd->se_tfo->get_task_tag(cmd));
|
|
#endif
|
|
cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS;
|
|
cmd->se_tfo->queue_status(cmd);
|
|
ret = 1;
|
|
}
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(transport_check_aborted_status);
|
|
|
|
void transport_send_task_abort(struct se_cmd *cmd)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&cmd->t_state_lock, flags);
|
|
if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
return;
|
|
}
|
|
spin_unlock_irqrestore(&cmd->t_state_lock, flags);
|
|
|
|
/*
|
|
* If there are still expected incoming fabric WRITEs, we wait
|
|
* until until they have completed before sending a TASK_ABORTED
|
|
* response. This response with TASK_ABORTED status will be
|
|
* queued back to fabric module by transport_check_aborted_status().
|
|
*/
|
|
if (cmd->data_direction == DMA_TO_DEVICE) {
|
|
if (cmd->se_tfo->write_pending_status(cmd) != 0) {
|
|
cmd->transport_state |= CMD_T_ABORTED;
|
|
smp_mb__after_atomic_inc();
|
|
}
|
|
}
|
|
cmd->scsi_status = SAM_STAT_TASK_ABORTED;
|
|
#if 0
|
|
pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
|
|
" ITT: 0x%08x\n", cmd->t_task_cdb[0],
|
|
cmd->se_tfo->get_task_tag(cmd));
|
|
#endif
|
|
cmd->se_tfo->queue_status(cmd);
|
|
}
|
|
|
|
static int transport_generic_do_tmr(struct se_cmd *cmd)
|
|
{
|
|
struct se_device *dev = cmd->se_dev;
|
|
struct se_tmr_req *tmr = cmd->se_tmr_req;
|
|
int ret;
|
|
|
|
switch (tmr->function) {
|
|
case TMR_ABORT_TASK:
|
|
core_tmr_abort_task(dev, tmr, cmd->se_sess);
|
|
break;
|
|
case TMR_ABORT_TASK_SET:
|
|
case TMR_CLEAR_ACA:
|
|
case TMR_CLEAR_TASK_SET:
|
|
tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
|
|
break;
|
|
case TMR_LUN_RESET:
|
|
ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
|
|
tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
|
|
TMR_FUNCTION_REJECTED;
|
|
break;
|
|
case TMR_TARGET_WARM_RESET:
|
|
tmr->response = TMR_FUNCTION_REJECTED;
|
|
break;
|
|
case TMR_TARGET_COLD_RESET:
|
|
tmr->response = TMR_FUNCTION_REJECTED;
|
|
break;
|
|
default:
|
|
pr_err("Uknown TMR function: 0x%02x.\n",
|
|
tmr->function);
|
|
tmr->response = TMR_FUNCTION_REJECTED;
|
|
break;
|
|
}
|
|
|
|
cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
|
|
cmd->se_tfo->queue_tm_rsp(cmd);
|
|
|
|
transport_cmd_check_stop_to_fabric(cmd);
|
|
return 0;
|
|
}
|
|
|
|
/* transport_processing_thread():
|
|
*
|
|
*
|
|
*/
|
|
static int transport_processing_thread(void *param)
|
|
{
|
|
int ret;
|
|
struct se_cmd *cmd;
|
|
struct se_device *dev = param;
|
|
|
|
while (!kthread_should_stop()) {
|
|
ret = wait_event_interruptible(dev->dev_queue_obj.thread_wq,
|
|
atomic_read(&dev->dev_queue_obj.queue_cnt) ||
|
|
kthread_should_stop());
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
get_cmd:
|
|
cmd = transport_get_cmd_from_queue(&dev->dev_queue_obj);
|
|
if (!cmd)
|
|
continue;
|
|
|
|
switch (cmd->t_state) {
|
|
case TRANSPORT_NEW_CMD:
|
|
BUG();
|
|
break;
|
|
case TRANSPORT_NEW_CMD_MAP:
|
|
if (!cmd->se_tfo->new_cmd_map) {
|
|
pr_err("cmd->se_tfo->new_cmd_map is"
|
|
" NULL for TRANSPORT_NEW_CMD_MAP\n");
|
|
BUG();
|
|
}
|
|
ret = cmd->se_tfo->new_cmd_map(cmd);
|
|
if (ret < 0) {
|
|
transport_generic_request_failure(cmd);
|
|
break;
|
|
}
|
|
ret = transport_generic_new_cmd(cmd);
|
|
if (ret < 0) {
|
|
transport_generic_request_failure(cmd);
|
|
break;
|
|
}
|
|
break;
|
|
case TRANSPORT_PROCESS_WRITE:
|
|
transport_generic_process_write(cmd);
|
|
break;
|
|
case TRANSPORT_PROCESS_TMR:
|
|
transport_generic_do_tmr(cmd);
|
|
break;
|
|
case TRANSPORT_COMPLETE_QF_WP:
|
|
transport_write_pending_qf(cmd);
|
|
break;
|
|
case TRANSPORT_COMPLETE_QF_OK:
|
|
transport_complete_qf(cmd);
|
|
break;
|
|
default:
|
|
pr_err("Unknown t_state: %d for ITT: 0x%08x "
|
|
"i_state: %d on SE LUN: %u\n",
|
|
cmd->t_state,
|
|
cmd->se_tfo->get_task_tag(cmd),
|
|
cmd->se_tfo->get_cmd_state(cmd),
|
|
cmd->se_lun->unpacked_lun);
|
|
BUG();
|
|
}
|
|
|
|
goto get_cmd;
|
|
}
|
|
|
|
out:
|
|
WARN_ON(!list_empty(&dev->state_task_list));
|
|
WARN_ON(!list_empty(&dev->dev_queue_obj.qobj_list));
|
|
dev->process_thread = NULL;
|
|
return 0;
|
|
}
|