![Bart Van Assche](/assets/img/avatar_default.png)
Target drivers must guarantee that struct se_cmd and struct se_tmr_req exist as long as target_tmr_work() is in progress. This is why the tcm_loop driver today passes 1 as second argument to transport_generic_free_cmd() from inside the TMF code. Instead of making the TMF code wait, make the TMF code obtain two references (SCF_ACK_KREF) and drop one reference from inside the .check_stop_free() callback. Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.com> Cc: David Disseldorp <ddiss@suse.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
1264 lines
32 KiB
C
1264 lines
32 KiB
C
/*******************************************************************************
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*
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* This file contains the Linux/SCSI LLD virtual SCSI initiator driver
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* for emulated SAS initiator ports
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*
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* © Copyright 2011-2013 Datera, Inc.
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*
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* Licensed to the Linux Foundation under the General Public License (GPL) version 2.
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*
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* Author: Nicholas A. Bellinger <nab@risingtidesystems.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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****************************************************************************/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/configfs.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_tcq.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_cmnd.h>
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#include <target/target_core_base.h>
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#include <target/target_core_fabric.h>
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#include "tcm_loop.h"
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#define to_tcm_loop_hba(hba) container_of(hba, struct tcm_loop_hba, dev)
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static struct workqueue_struct *tcm_loop_workqueue;
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static struct kmem_cache *tcm_loop_cmd_cache;
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static int tcm_loop_hba_no_cnt;
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static int tcm_loop_queue_status(struct se_cmd *se_cmd);
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/*
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* Called from struct target_core_fabric_ops->check_stop_free()
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*/
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static int tcm_loop_check_stop_free(struct se_cmd *se_cmd)
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{
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return transport_generic_free_cmd(se_cmd, 0);
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}
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static void tcm_loop_release_cmd(struct se_cmd *se_cmd)
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{
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struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
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struct tcm_loop_cmd, tl_se_cmd);
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kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
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}
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static int tcm_loop_show_info(struct seq_file *m, struct Scsi_Host *host)
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{
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seq_printf(m, "tcm_loop_proc_info()\n");
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return 0;
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}
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static int tcm_loop_driver_probe(struct device *);
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static int tcm_loop_driver_remove(struct device *);
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static int pseudo_lld_bus_match(struct device *dev,
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struct device_driver *dev_driver)
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{
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return 1;
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}
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static struct bus_type tcm_loop_lld_bus = {
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.name = "tcm_loop_bus",
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.match = pseudo_lld_bus_match,
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.probe = tcm_loop_driver_probe,
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.remove = tcm_loop_driver_remove,
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};
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static struct device_driver tcm_loop_driverfs = {
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.name = "tcm_loop",
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.bus = &tcm_loop_lld_bus,
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};
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/*
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* Used with root_device_register() in tcm_loop_alloc_core_bus() below
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*/
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static struct device *tcm_loop_primary;
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static void tcm_loop_submission_work(struct work_struct *work)
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{
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struct tcm_loop_cmd *tl_cmd =
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container_of(work, struct tcm_loop_cmd, work);
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struct se_cmd *se_cmd = &tl_cmd->tl_se_cmd;
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struct scsi_cmnd *sc = tl_cmd->sc;
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struct tcm_loop_nexus *tl_nexus;
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struct tcm_loop_hba *tl_hba;
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struct tcm_loop_tpg *tl_tpg;
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struct scatterlist *sgl_bidi = NULL;
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u32 sgl_bidi_count = 0, transfer_length;
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int rc;
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tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
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tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
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/*
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* Ensure that this tl_tpg reference from the incoming sc->device->id
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* has already been configured via tcm_loop_make_naa_tpg().
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*/
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if (!tl_tpg->tl_hba) {
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set_host_byte(sc, DID_NO_CONNECT);
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goto out_done;
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}
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if (tl_tpg->tl_transport_status == TCM_TRANSPORT_OFFLINE) {
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set_host_byte(sc, DID_TRANSPORT_DISRUPTED);
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goto out_done;
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}
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tl_nexus = tl_tpg->tl_nexus;
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if (!tl_nexus) {
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scmd_printk(KERN_ERR, sc, "TCM_Loop I_T Nexus"
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" does not exist\n");
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set_host_byte(sc, DID_ERROR);
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goto out_done;
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}
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if (scsi_bidi_cmnd(sc)) {
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struct scsi_data_buffer *sdb = scsi_in(sc);
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sgl_bidi = sdb->table.sgl;
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sgl_bidi_count = sdb->table.nents;
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se_cmd->se_cmd_flags |= SCF_BIDI;
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}
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transfer_length = scsi_transfer_length(sc);
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if (!scsi_prot_sg_count(sc) &&
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scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) {
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se_cmd->prot_pto = true;
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/*
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* loopback transport doesn't support
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* WRITE_GENERATE, READ_STRIP protection
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* information operations, go ahead unprotected.
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*/
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transfer_length = scsi_bufflen(sc);
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}
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se_cmd->tag = tl_cmd->sc_cmd_tag;
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rc = target_submit_cmd_map_sgls(se_cmd, tl_nexus->se_sess, sc->cmnd,
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&tl_cmd->tl_sense_buf[0], tl_cmd->sc->device->lun,
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transfer_length, TCM_SIMPLE_TAG,
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sc->sc_data_direction, 0,
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scsi_sglist(sc), scsi_sg_count(sc),
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sgl_bidi, sgl_bidi_count,
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scsi_prot_sglist(sc), scsi_prot_sg_count(sc));
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if (rc < 0) {
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set_host_byte(sc, DID_NO_CONNECT);
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goto out_done;
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}
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return;
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out_done:
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kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
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sc->scsi_done(sc);
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return;
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}
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/*
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* ->queuecommand can be and usually is called from interrupt context, so
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* defer the actual submission to a workqueue.
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*/
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static int tcm_loop_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc)
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{
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struct tcm_loop_cmd *tl_cmd;
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pr_debug("tcm_loop_queuecommand() %d:%d:%d:%llu got CDB: 0x%02x"
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" scsi_buf_len: %u\n", sc->device->host->host_no,
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sc->device->id, sc->device->channel, sc->device->lun,
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sc->cmnd[0], scsi_bufflen(sc));
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tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_ATOMIC);
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if (!tl_cmd) {
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pr_err("Unable to allocate struct tcm_loop_cmd\n");
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set_host_byte(sc, DID_ERROR);
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sc->scsi_done(sc);
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return 0;
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}
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tl_cmd->sc = sc;
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tl_cmd->sc_cmd_tag = sc->request->tag;
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INIT_WORK(&tl_cmd->work, tcm_loop_submission_work);
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queue_work(tcm_loop_workqueue, &tl_cmd->work);
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return 0;
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}
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/*
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* Called from SCSI EH process context to issue a LUN_RESET TMR
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* to struct scsi_device
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*/
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static int tcm_loop_issue_tmr(struct tcm_loop_tpg *tl_tpg,
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u64 lun, int task, enum tcm_tmreq_table tmr)
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{
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struct se_cmd *se_cmd = NULL;
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struct se_session *se_sess;
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struct tcm_loop_nexus *tl_nexus;
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struct tcm_loop_cmd *tl_cmd = NULL;
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int ret = TMR_FUNCTION_FAILED, rc;
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/*
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* Locate the tl_nexus and se_sess pointers
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*/
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tl_nexus = tl_tpg->tl_nexus;
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if (!tl_nexus) {
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pr_err("Unable to perform device reset without"
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" active I_T Nexus\n");
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return ret;
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}
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tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL);
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if (!tl_cmd) {
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pr_err("Unable to allocate memory for tl_cmd\n");
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return ret;
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}
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init_completion(&tl_cmd->tmr_done);
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se_cmd = &tl_cmd->tl_se_cmd;
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se_sess = tl_tpg->tl_nexus->se_sess;
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rc = target_submit_tmr(se_cmd, se_sess, tl_cmd->tl_sense_buf, lun,
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NULL, tmr, GFP_KERNEL, task,
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TARGET_SCF_ACK_KREF);
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if (rc < 0)
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goto release;
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wait_for_completion(&tl_cmd->tmr_done);
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ret = se_cmd->se_tmr_req->response;
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target_put_sess_cmd(se_cmd);
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out:
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return ret;
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release:
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if (se_cmd)
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transport_generic_free_cmd(se_cmd, 0);
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else
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kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
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goto out;
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}
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static int tcm_loop_abort_task(struct scsi_cmnd *sc)
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{
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struct tcm_loop_hba *tl_hba;
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struct tcm_loop_tpg *tl_tpg;
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int ret = FAILED;
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/*
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* Locate the tcm_loop_hba_t pointer
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*/
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tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
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tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
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ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun,
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sc->request->tag, TMR_ABORT_TASK);
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return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
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}
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/*
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* Called from SCSI EH process context to issue a LUN_RESET TMR
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* to struct scsi_device
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*/
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static int tcm_loop_device_reset(struct scsi_cmnd *sc)
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{
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struct tcm_loop_hba *tl_hba;
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struct tcm_loop_tpg *tl_tpg;
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int ret = FAILED;
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/*
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* Locate the tcm_loop_hba_t pointer
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*/
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tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
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tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
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ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun,
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0, TMR_LUN_RESET);
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return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
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}
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static int tcm_loop_target_reset(struct scsi_cmnd *sc)
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{
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struct tcm_loop_hba *tl_hba;
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struct tcm_loop_tpg *tl_tpg;
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/*
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* Locate the tcm_loop_hba_t pointer
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*/
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tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
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if (!tl_hba) {
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pr_err("Unable to perform device reset without"
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" active I_T Nexus\n");
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return FAILED;
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}
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/*
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* Locate the tl_tpg pointer from TargetID in sc->device->id
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*/
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tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
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if (tl_tpg) {
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tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
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return SUCCESS;
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}
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return FAILED;
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}
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static int tcm_loop_slave_alloc(struct scsi_device *sd)
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{
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set_bit(QUEUE_FLAG_BIDI, &sd->request_queue->queue_flags);
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return 0;
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}
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static struct scsi_host_template tcm_loop_driver_template = {
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.show_info = tcm_loop_show_info,
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.proc_name = "tcm_loopback",
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.name = "TCM_Loopback",
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.queuecommand = tcm_loop_queuecommand,
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.change_queue_depth = scsi_change_queue_depth,
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.eh_abort_handler = tcm_loop_abort_task,
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.eh_device_reset_handler = tcm_loop_device_reset,
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.eh_target_reset_handler = tcm_loop_target_reset,
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.can_queue = 1024,
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.this_id = -1,
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.sg_tablesize = 256,
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.cmd_per_lun = 1024,
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.max_sectors = 0xFFFF,
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.use_clustering = DISABLE_CLUSTERING,
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.slave_alloc = tcm_loop_slave_alloc,
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.module = THIS_MODULE,
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.track_queue_depth = 1,
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};
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static int tcm_loop_driver_probe(struct device *dev)
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{
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struct tcm_loop_hba *tl_hba;
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struct Scsi_Host *sh;
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int error, host_prot;
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tl_hba = to_tcm_loop_hba(dev);
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sh = scsi_host_alloc(&tcm_loop_driver_template,
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sizeof(struct tcm_loop_hba));
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if (!sh) {
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pr_err("Unable to allocate struct scsi_host\n");
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return -ENODEV;
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}
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tl_hba->sh = sh;
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/*
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* Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata
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*/
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*((struct tcm_loop_hba **)sh->hostdata) = tl_hba;
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/*
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* Setup single ID, Channel and LUN for now..
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*/
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sh->max_id = 2;
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sh->max_lun = 0;
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sh->max_channel = 0;
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sh->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
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host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION |
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SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION |
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SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION;
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scsi_host_set_prot(sh, host_prot);
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scsi_host_set_guard(sh, SHOST_DIX_GUARD_CRC);
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error = scsi_add_host(sh, &tl_hba->dev);
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if (error) {
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pr_err("%s: scsi_add_host failed\n", __func__);
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scsi_host_put(sh);
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return -ENODEV;
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}
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return 0;
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}
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static int tcm_loop_driver_remove(struct device *dev)
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{
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struct tcm_loop_hba *tl_hba;
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struct Scsi_Host *sh;
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tl_hba = to_tcm_loop_hba(dev);
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sh = tl_hba->sh;
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scsi_remove_host(sh);
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scsi_host_put(sh);
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return 0;
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}
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static void tcm_loop_release_adapter(struct device *dev)
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{
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struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev);
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kfree(tl_hba);
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}
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/*
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* Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c
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*/
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static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id)
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{
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int ret;
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tl_hba->dev.bus = &tcm_loop_lld_bus;
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tl_hba->dev.parent = tcm_loop_primary;
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tl_hba->dev.release = &tcm_loop_release_adapter;
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dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id);
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ret = device_register(&tl_hba->dev);
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if (ret) {
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pr_err("device_register() failed for"
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" tl_hba->dev: %d\n", ret);
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return -ENODEV;
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}
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return 0;
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}
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|
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/*
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* Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated
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* tcm_loop SCSI bus.
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*/
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static int tcm_loop_alloc_core_bus(void)
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{
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int ret;
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tcm_loop_primary = root_device_register("tcm_loop_0");
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if (IS_ERR(tcm_loop_primary)) {
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pr_err("Unable to allocate tcm_loop_primary\n");
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return PTR_ERR(tcm_loop_primary);
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}
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|
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ret = bus_register(&tcm_loop_lld_bus);
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if (ret) {
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pr_err("bus_register() failed for tcm_loop_lld_bus\n");
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goto dev_unreg;
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}
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|
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ret = driver_register(&tcm_loop_driverfs);
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if (ret) {
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pr_err("driver_register() failed for"
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"tcm_loop_driverfs\n");
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goto bus_unreg;
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}
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pr_debug("Initialized TCM Loop Core Bus\n");
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return ret;
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bus_unreg:
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bus_unregister(&tcm_loop_lld_bus);
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dev_unreg:
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root_device_unregister(tcm_loop_primary);
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return ret;
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}
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|
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static void tcm_loop_release_core_bus(void)
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{
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driver_unregister(&tcm_loop_driverfs);
|
|
bus_unregister(&tcm_loop_lld_bus);
|
|
root_device_unregister(tcm_loop_primary);
|
|
|
|
pr_debug("Releasing TCM Loop Core BUS\n");
|
|
}
|
|
|
|
static char *tcm_loop_get_fabric_name(void)
|
|
{
|
|
return "loopback";
|
|
}
|
|
|
|
static inline struct tcm_loop_tpg *tl_tpg(struct se_portal_group *se_tpg)
|
|
{
|
|
return container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
|
|
}
|
|
|
|
static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg)
|
|
{
|
|
/*
|
|
* Return the passed NAA identifier for the Target Port
|
|
*/
|
|
return &tl_tpg(se_tpg)->tl_hba->tl_wwn_address[0];
|
|
}
|
|
|
|
static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg)
|
|
{
|
|
/*
|
|
* This Tag is used when forming SCSI Name identifier in EVPD=1 0x83
|
|
* to represent the SCSI Target Port.
|
|
*/
|
|
return tl_tpg(se_tpg)->tl_tpgt;
|
|
}
|
|
|
|
/*
|
|
* Returning (1) here allows for target_core_mod struct se_node_acl to be generated
|
|
* based upon the incoming fabric dependent SCSI Initiator Port
|
|
*/
|
|
static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for
|
|
* local virtual Linux/SCSI LLD passthrough into VM hypervisor guest
|
|
*/
|
|
static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Because TCM_Loop does not use explict ACLs and MappedLUNs, this will
|
|
* never be called for TCM_Loop by target_core_fabric_configfs.c code.
|
|
* It has been added here as a nop for target_fabric_tf_ops_check()
|
|
*/
|
|
static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int tcm_loop_check_prot_fabric_only(struct se_portal_group *se_tpg)
|
|
{
|
|
struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
|
|
tl_se_tpg);
|
|
return tl_tpg->tl_fabric_prot_type;
|
|
}
|
|
|
|
static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static u32 tcm_loop_sess_get_index(struct se_session *se_sess)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl)
|
|
{
|
|
return;
|
|
}
|
|
|
|
static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd)
|
|
{
|
|
struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
|
|
struct tcm_loop_cmd, tl_se_cmd);
|
|
|
|
return tl_cmd->sc_cmd_state;
|
|
}
|
|
|
|
static int tcm_loop_write_pending(struct se_cmd *se_cmd)
|
|
{
|
|
/*
|
|
* Since Linux/SCSI has already sent down a struct scsi_cmnd
|
|
* sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array
|
|
* memory, and memory has already been mapped to struct se_cmd->t_mem_list
|
|
* format with transport_generic_map_mem_to_cmd().
|
|
*
|
|
* We now tell TCM to add this WRITE CDB directly into the TCM storage
|
|
* object execution queue.
|
|
*/
|
|
target_execute_cmd(se_cmd);
|
|
return 0;
|
|
}
|
|
|
|
static int tcm_loop_write_pending_status(struct se_cmd *se_cmd)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int tcm_loop_queue_data_in(struct se_cmd *se_cmd)
|
|
{
|
|
struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
|
|
struct tcm_loop_cmd, tl_se_cmd);
|
|
struct scsi_cmnd *sc = tl_cmd->sc;
|
|
|
|
pr_debug("tcm_loop_queue_data_in() called for scsi_cmnd: %p"
|
|
" cdb: 0x%02x\n", sc, sc->cmnd[0]);
|
|
|
|
sc->result = SAM_STAT_GOOD;
|
|
set_host_byte(sc, DID_OK);
|
|
if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
|
|
(se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
|
|
scsi_set_resid(sc, se_cmd->residual_count);
|
|
sc->scsi_done(sc);
|
|
return 0;
|
|
}
|
|
|
|
static int tcm_loop_queue_status(struct se_cmd *se_cmd)
|
|
{
|
|
struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
|
|
struct tcm_loop_cmd, tl_se_cmd);
|
|
struct scsi_cmnd *sc = tl_cmd->sc;
|
|
|
|
pr_debug("tcm_loop_queue_status() called for scsi_cmnd: %p"
|
|
" cdb: 0x%02x\n", sc, sc->cmnd[0]);
|
|
|
|
if (se_cmd->sense_buffer &&
|
|
((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
|
|
(se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
|
|
|
|
memcpy(sc->sense_buffer, se_cmd->sense_buffer,
|
|
SCSI_SENSE_BUFFERSIZE);
|
|
sc->result = SAM_STAT_CHECK_CONDITION;
|
|
set_driver_byte(sc, DRIVER_SENSE);
|
|
} else
|
|
sc->result = se_cmd->scsi_status;
|
|
|
|
set_host_byte(sc, DID_OK);
|
|
if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
|
|
(se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
|
|
scsi_set_resid(sc, se_cmd->residual_count);
|
|
sc->scsi_done(sc);
|
|
return 0;
|
|
}
|
|
|
|
static void tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd)
|
|
{
|
|
struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
|
|
struct tcm_loop_cmd, tl_se_cmd);
|
|
|
|
/* Wake up tcm_loop_issue_tmr(). */
|
|
complete(&tl_cmd->tmr_done);
|
|
}
|
|
|
|
static void tcm_loop_aborted_task(struct se_cmd *se_cmd)
|
|
{
|
|
return;
|
|
}
|
|
|
|
static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba)
|
|
{
|
|
switch (tl_hba->tl_proto_id) {
|
|
case SCSI_PROTOCOL_SAS:
|
|
return "SAS";
|
|
case SCSI_PROTOCOL_FCP:
|
|
return "FCP";
|
|
case SCSI_PROTOCOL_ISCSI:
|
|
return "iSCSI";
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return "Unknown";
|
|
}
|
|
|
|
/* Start items for tcm_loop_port_cit */
|
|
|
|
static int tcm_loop_port_link(
|
|
struct se_portal_group *se_tpg,
|
|
struct se_lun *lun)
|
|
{
|
|
struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
|
|
struct tcm_loop_tpg, tl_se_tpg);
|
|
struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
|
|
|
|
atomic_inc_mb(&tl_tpg->tl_tpg_port_count);
|
|
/*
|
|
* Add Linux/SCSI struct scsi_device by HCTL
|
|
*/
|
|
scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun);
|
|
|
|
pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n");
|
|
return 0;
|
|
}
|
|
|
|
static void tcm_loop_port_unlink(
|
|
struct se_portal_group *se_tpg,
|
|
struct se_lun *se_lun)
|
|
{
|
|
struct scsi_device *sd;
|
|
struct tcm_loop_hba *tl_hba;
|
|
struct tcm_loop_tpg *tl_tpg;
|
|
|
|
tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
|
|
tl_hba = tl_tpg->tl_hba;
|
|
|
|
sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt,
|
|
se_lun->unpacked_lun);
|
|
if (!sd) {
|
|
pr_err("Unable to locate struct scsi_device for %d:%d:"
|
|
"%llu\n", 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun);
|
|
return;
|
|
}
|
|
/*
|
|
* Remove Linux/SCSI struct scsi_device by HCTL
|
|
*/
|
|
scsi_remove_device(sd);
|
|
scsi_device_put(sd);
|
|
|
|
atomic_dec_mb(&tl_tpg->tl_tpg_port_count);
|
|
|
|
pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n");
|
|
}
|
|
|
|
/* End items for tcm_loop_port_cit */
|
|
|
|
static ssize_t tcm_loop_tpg_attrib_fabric_prot_type_show(
|
|
struct config_item *item, char *page)
|
|
{
|
|
struct se_portal_group *se_tpg = attrib_to_tpg(item);
|
|
struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
|
|
tl_se_tpg);
|
|
|
|
return sprintf(page, "%d\n", tl_tpg->tl_fabric_prot_type);
|
|
}
|
|
|
|
static ssize_t tcm_loop_tpg_attrib_fabric_prot_type_store(
|
|
struct config_item *item, const char *page, size_t count)
|
|
{
|
|
struct se_portal_group *se_tpg = attrib_to_tpg(item);
|
|
struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
|
|
tl_se_tpg);
|
|
unsigned long val;
|
|
int ret = kstrtoul(page, 0, &val);
|
|
|
|
if (ret) {
|
|
pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret);
|
|
return ret;
|
|
}
|
|
if (val != 0 && val != 1 && val != 3) {
|
|
pr_err("Invalid qla2xxx fabric_prot_type: %lu\n", val);
|
|
return -EINVAL;
|
|
}
|
|
tl_tpg->tl_fabric_prot_type = val;
|
|
|
|
return count;
|
|
}
|
|
|
|
CONFIGFS_ATTR(tcm_loop_tpg_attrib_, fabric_prot_type);
|
|
|
|
static struct configfs_attribute *tcm_loop_tpg_attrib_attrs[] = {
|
|
&tcm_loop_tpg_attrib_attr_fabric_prot_type,
|
|
NULL,
|
|
};
|
|
|
|
/* Start items for tcm_loop_nexus_cit */
|
|
|
|
static int tcm_loop_alloc_sess_cb(struct se_portal_group *se_tpg,
|
|
struct se_session *se_sess, void *p)
|
|
{
|
|
struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
|
|
struct tcm_loop_tpg, tl_se_tpg);
|
|
|
|
tl_tpg->tl_nexus = p;
|
|
return 0;
|
|
}
|
|
|
|
static int tcm_loop_make_nexus(
|
|
struct tcm_loop_tpg *tl_tpg,
|
|
const char *name)
|
|
{
|
|
struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
|
|
struct tcm_loop_nexus *tl_nexus;
|
|
int ret;
|
|
|
|
if (tl_tpg->tl_nexus) {
|
|
pr_debug("tl_tpg->tl_nexus already exists\n");
|
|
return -EEXIST;
|
|
}
|
|
|
|
tl_nexus = kzalloc(sizeof(struct tcm_loop_nexus), GFP_KERNEL);
|
|
if (!tl_nexus) {
|
|
pr_err("Unable to allocate struct tcm_loop_nexus\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
tl_nexus->se_sess = target_alloc_session(&tl_tpg->tl_se_tpg, 0, 0,
|
|
TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS,
|
|
name, tl_nexus, tcm_loop_alloc_sess_cb);
|
|
if (IS_ERR(tl_nexus->se_sess)) {
|
|
ret = PTR_ERR(tl_nexus->se_sess);
|
|
kfree(tl_nexus);
|
|
return ret;
|
|
}
|
|
|
|
pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated"
|
|
" %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba),
|
|
name);
|
|
return 0;
|
|
}
|
|
|
|
static int tcm_loop_drop_nexus(
|
|
struct tcm_loop_tpg *tpg)
|
|
{
|
|
struct se_session *se_sess;
|
|
struct tcm_loop_nexus *tl_nexus;
|
|
|
|
tl_nexus = tpg->tl_nexus;
|
|
if (!tl_nexus)
|
|
return -ENODEV;
|
|
|
|
se_sess = tl_nexus->se_sess;
|
|
if (!se_sess)
|
|
return -ENODEV;
|
|
|
|
if (atomic_read(&tpg->tl_tpg_port_count)) {
|
|
pr_err("Unable to remove TCM_Loop I_T Nexus with"
|
|
" active TPG port count: %d\n",
|
|
atomic_read(&tpg->tl_tpg_port_count));
|
|
return -EPERM;
|
|
}
|
|
|
|
pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated"
|
|
" %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tpg->tl_hba),
|
|
tl_nexus->se_sess->se_node_acl->initiatorname);
|
|
/*
|
|
* Release the SCSI I_T Nexus to the emulated Target Port
|
|
*/
|
|
transport_deregister_session(tl_nexus->se_sess);
|
|
tpg->tl_nexus = NULL;
|
|
kfree(tl_nexus);
|
|
return 0;
|
|
}
|
|
|
|
/* End items for tcm_loop_nexus_cit */
|
|
|
|
static ssize_t tcm_loop_tpg_nexus_show(struct config_item *item, char *page)
|
|
{
|
|
struct se_portal_group *se_tpg = to_tpg(item);
|
|
struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
|
|
struct tcm_loop_tpg, tl_se_tpg);
|
|
struct tcm_loop_nexus *tl_nexus;
|
|
ssize_t ret;
|
|
|
|
tl_nexus = tl_tpg->tl_nexus;
|
|
if (!tl_nexus)
|
|
return -ENODEV;
|
|
|
|
ret = snprintf(page, PAGE_SIZE, "%s\n",
|
|
tl_nexus->se_sess->se_node_acl->initiatorname);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t tcm_loop_tpg_nexus_store(struct config_item *item,
|
|
const char *page, size_t count)
|
|
{
|
|
struct se_portal_group *se_tpg = to_tpg(item);
|
|
struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
|
|
struct tcm_loop_tpg, tl_se_tpg);
|
|
struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
|
|
unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr;
|
|
int ret;
|
|
/*
|
|
* Shutdown the active I_T nexus if 'NULL' is passed..
|
|
*/
|
|
if (!strncmp(page, "NULL", 4)) {
|
|
ret = tcm_loop_drop_nexus(tl_tpg);
|
|
return (!ret) ? count : ret;
|
|
}
|
|
/*
|
|
* Otherwise make sure the passed virtual Initiator port WWN matches
|
|
* the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call
|
|
* tcm_loop_make_nexus()
|
|
*/
|
|
if (strlen(page) >= TL_WWN_ADDR_LEN) {
|
|
pr_err("Emulated NAA Sas Address: %s, exceeds"
|
|
" max: %d\n", page, TL_WWN_ADDR_LEN);
|
|
return -EINVAL;
|
|
}
|
|
snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page);
|
|
|
|
ptr = strstr(i_port, "naa.");
|
|
if (ptr) {
|
|
if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) {
|
|
pr_err("Passed SAS Initiator Port %s does not"
|
|
" match target port protoid: %s\n", i_port,
|
|
tcm_loop_dump_proto_id(tl_hba));
|
|
return -EINVAL;
|
|
}
|
|
port_ptr = &i_port[0];
|
|
goto check_newline;
|
|
}
|
|
ptr = strstr(i_port, "fc.");
|
|
if (ptr) {
|
|
if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) {
|
|
pr_err("Passed FCP Initiator Port %s does not"
|
|
" match target port protoid: %s\n", i_port,
|
|
tcm_loop_dump_proto_id(tl_hba));
|
|
return -EINVAL;
|
|
}
|
|
port_ptr = &i_port[3]; /* Skip over "fc." */
|
|
goto check_newline;
|
|
}
|
|
ptr = strstr(i_port, "iqn.");
|
|
if (ptr) {
|
|
if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) {
|
|
pr_err("Passed iSCSI Initiator Port %s does not"
|
|
" match target port protoid: %s\n", i_port,
|
|
tcm_loop_dump_proto_id(tl_hba));
|
|
return -EINVAL;
|
|
}
|
|
port_ptr = &i_port[0];
|
|
goto check_newline;
|
|
}
|
|
pr_err("Unable to locate prefix for emulated Initiator Port:"
|
|
" %s\n", i_port);
|
|
return -EINVAL;
|
|
/*
|
|
* Clear any trailing newline for the NAA WWN
|
|
*/
|
|
check_newline:
|
|
if (i_port[strlen(i_port)-1] == '\n')
|
|
i_port[strlen(i_port)-1] = '\0';
|
|
|
|
ret = tcm_loop_make_nexus(tl_tpg, port_ptr);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return count;
|
|
}
|
|
|
|
static ssize_t tcm_loop_tpg_transport_status_show(struct config_item *item,
|
|
char *page)
|
|
{
|
|
struct se_portal_group *se_tpg = to_tpg(item);
|
|
struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
|
|
struct tcm_loop_tpg, tl_se_tpg);
|
|
const char *status = NULL;
|
|
ssize_t ret = -EINVAL;
|
|
|
|
switch (tl_tpg->tl_transport_status) {
|
|
case TCM_TRANSPORT_ONLINE:
|
|
status = "online";
|
|
break;
|
|
case TCM_TRANSPORT_OFFLINE:
|
|
status = "offline";
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (status)
|
|
ret = snprintf(page, PAGE_SIZE, "%s\n", status);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t tcm_loop_tpg_transport_status_store(struct config_item *item,
|
|
const char *page, size_t count)
|
|
{
|
|
struct se_portal_group *se_tpg = to_tpg(item);
|
|
struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
|
|
struct tcm_loop_tpg, tl_se_tpg);
|
|
|
|
if (!strncmp(page, "online", 6)) {
|
|
tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
|
|
return count;
|
|
}
|
|
if (!strncmp(page, "offline", 7)) {
|
|
tl_tpg->tl_transport_status = TCM_TRANSPORT_OFFLINE;
|
|
if (tl_tpg->tl_nexus) {
|
|
struct se_session *tl_sess = tl_tpg->tl_nexus->se_sess;
|
|
|
|
core_allocate_nexus_loss_ua(tl_sess->se_node_acl);
|
|
}
|
|
return count;
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
static ssize_t tcm_loop_tpg_address_show(struct config_item *item,
|
|
char *page)
|
|
{
|
|
struct se_portal_group *se_tpg = to_tpg(item);
|
|
struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
|
|
struct tcm_loop_tpg, tl_se_tpg);
|
|
struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
|
|
|
|
return snprintf(page, PAGE_SIZE, "%d:0:%d\n",
|
|
tl_hba->sh->host_no, tl_tpg->tl_tpgt);
|
|
}
|
|
|
|
CONFIGFS_ATTR(tcm_loop_tpg_, nexus);
|
|
CONFIGFS_ATTR(tcm_loop_tpg_, transport_status);
|
|
CONFIGFS_ATTR_RO(tcm_loop_tpg_, address);
|
|
|
|
static struct configfs_attribute *tcm_loop_tpg_attrs[] = {
|
|
&tcm_loop_tpg_attr_nexus,
|
|
&tcm_loop_tpg_attr_transport_status,
|
|
&tcm_loop_tpg_attr_address,
|
|
NULL,
|
|
};
|
|
|
|
/* Start items for tcm_loop_naa_cit */
|
|
|
|
static struct se_portal_group *tcm_loop_make_naa_tpg(
|
|
struct se_wwn *wwn,
|
|
struct config_group *group,
|
|
const char *name)
|
|
{
|
|
struct tcm_loop_hba *tl_hba = container_of(wwn,
|
|
struct tcm_loop_hba, tl_hba_wwn);
|
|
struct tcm_loop_tpg *tl_tpg;
|
|
int ret;
|
|
unsigned long tpgt;
|
|
|
|
if (strstr(name, "tpgt_") != name) {
|
|
pr_err("Unable to locate \"tpgt_#\" directory"
|
|
" group\n");
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
if (kstrtoul(name+5, 10, &tpgt))
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
if (tpgt >= TL_TPGS_PER_HBA) {
|
|
pr_err("Passed tpgt: %lu exceeds TL_TPGS_PER_HBA:"
|
|
" %u\n", tpgt, TL_TPGS_PER_HBA);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
tl_tpg = &tl_hba->tl_hba_tpgs[tpgt];
|
|
tl_tpg->tl_hba = tl_hba;
|
|
tl_tpg->tl_tpgt = tpgt;
|
|
/*
|
|
* Register the tl_tpg as a emulated TCM Target Endpoint
|
|
*/
|
|
ret = core_tpg_register(wwn, &tl_tpg->tl_se_tpg, tl_hba->tl_proto_id);
|
|
if (ret < 0)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s"
|
|
" Target Port %s,t,0x%04lx\n", tcm_loop_dump_proto_id(tl_hba),
|
|
config_item_name(&wwn->wwn_group.cg_item), tpgt);
|
|
|
|
return &tl_tpg->tl_se_tpg;
|
|
}
|
|
|
|
static void tcm_loop_drop_naa_tpg(
|
|
struct se_portal_group *se_tpg)
|
|
{
|
|
struct se_wwn *wwn = se_tpg->se_tpg_wwn;
|
|
struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
|
|
struct tcm_loop_tpg, tl_se_tpg);
|
|
struct tcm_loop_hba *tl_hba;
|
|
unsigned short tpgt;
|
|
|
|
tl_hba = tl_tpg->tl_hba;
|
|
tpgt = tl_tpg->tl_tpgt;
|
|
/*
|
|
* Release the I_T Nexus for the Virtual target link if present
|
|
*/
|
|
tcm_loop_drop_nexus(tl_tpg);
|
|
/*
|
|
* Deregister the tl_tpg as a emulated TCM Target Endpoint
|
|
*/
|
|
core_tpg_deregister(se_tpg);
|
|
|
|
tl_tpg->tl_hba = NULL;
|
|
tl_tpg->tl_tpgt = 0;
|
|
|
|
pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s"
|
|
" Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba),
|
|
config_item_name(&wwn->wwn_group.cg_item), tpgt);
|
|
}
|
|
|
|
/* End items for tcm_loop_naa_cit */
|
|
|
|
/* Start items for tcm_loop_cit */
|
|
|
|
static struct se_wwn *tcm_loop_make_scsi_hba(
|
|
struct target_fabric_configfs *tf,
|
|
struct config_group *group,
|
|
const char *name)
|
|
{
|
|
struct tcm_loop_hba *tl_hba;
|
|
struct Scsi_Host *sh;
|
|
char *ptr;
|
|
int ret, off = 0;
|
|
|
|
tl_hba = kzalloc(sizeof(struct tcm_loop_hba), GFP_KERNEL);
|
|
if (!tl_hba) {
|
|
pr_err("Unable to allocate struct tcm_loop_hba\n");
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
/*
|
|
* Determine the emulated Protocol Identifier and Target Port Name
|
|
* based on the incoming configfs directory name.
|
|
*/
|
|
ptr = strstr(name, "naa.");
|
|
if (ptr) {
|
|
tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS;
|
|
goto check_len;
|
|
}
|
|
ptr = strstr(name, "fc.");
|
|
if (ptr) {
|
|
tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP;
|
|
off = 3; /* Skip over "fc." */
|
|
goto check_len;
|
|
}
|
|
ptr = strstr(name, "iqn.");
|
|
if (!ptr) {
|
|
pr_err("Unable to locate prefix for emulated Target "
|
|
"Port: %s\n", name);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI;
|
|
|
|
check_len:
|
|
if (strlen(name) >= TL_WWN_ADDR_LEN) {
|
|
pr_err("Emulated NAA %s Address: %s, exceeds"
|
|
" max: %d\n", name, tcm_loop_dump_proto_id(tl_hba),
|
|
TL_WWN_ADDR_LEN);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]);
|
|
|
|
/*
|
|
* Call device_register(tl_hba->dev) to register the emulated
|
|
* Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after
|
|
* device_register() callbacks in tcm_loop_driver_probe()
|
|
*/
|
|
ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt);
|
|
if (ret)
|
|
goto out;
|
|
|
|
sh = tl_hba->sh;
|
|
tcm_loop_hba_no_cnt++;
|
|
pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target"
|
|
" %s Address: %s at Linux/SCSI Host ID: %d\n",
|
|
tcm_loop_dump_proto_id(tl_hba), name, sh->host_no);
|
|
|
|
return &tl_hba->tl_hba_wwn;
|
|
out:
|
|
kfree(tl_hba);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
static void tcm_loop_drop_scsi_hba(
|
|
struct se_wwn *wwn)
|
|
{
|
|
struct tcm_loop_hba *tl_hba = container_of(wwn,
|
|
struct tcm_loop_hba, tl_hba_wwn);
|
|
|
|
pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target"
|
|
" %s Address: %s at Linux/SCSI Host ID: %d\n",
|
|
tcm_loop_dump_proto_id(tl_hba), tl_hba->tl_wwn_address,
|
|
tl_hba->sh->host_no);
|
|
/*
|
|
* Call device_unregister() on the original tl_hba->dev.
|
|
* tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will
|
|
* release *tl_hba;
|
|
*/
|
|
device_unregister(&tl_hba->dev);
|
|
}
|
|
|
|
/* Start items for tcm_loop_cit */
|
|
static ssize_t tcm_loop_wwn_version_show(struct config_item *item, char *page)
|
|
{
|
|
return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION);
|
|
}
|
|
|
|
CONFIGFS_ATTR_RO(tcm_loop_wwn_, version);
|
|
|
|
static struct configfs_attribute *tcm_loop_wwn_attrs[] = {
|
|
&tcm_loop_wwn_attr_version,
|
|
NULL,
|
|
};
|
|
|
|
/* End items for tcm_loop_cit */
|
|
|
|
static const struct target_core_fabric_ops loop_ops = {
|
|
.module = THIS_MODULE,
|
|
.name = "loopback",
|
|
.get_fabric_name = tcm_loop_get_fabric_name,
|
|
.tpg_get_wwn = tcm_loop_get_endpoint_wwn,
|
|
.tpg_get_tag = tcm_loop_get_tag,
|
|
.tpg_check_demo_mode = tcm_loop_check_demo_mode,
|
|
.tpg_check_demo_mode_cache = tcm_loop_check_demo_mode_cache,
|
|
.tpg_check_demo_mode_write_protect =
|
|
tcm_loop_check_demo_mode_write_protect,
|
|
.tpg_check_prod_mode_write_protect =
|
|
tcm_loop_check_prod_mode_write_protect,
|
|
.tpg_check_prot_fabric_only = tcm_loop_check_prot_fabric_only,
|
|
.tpg_get_inst_index = tcm_loop_get_inst_index,
|
|
.check_stop_free = tcm_loop_check_stop_free,
|
|
.release_cmd = tcm_loop_release_cmd,
|
|
.sess_get_index = tcm_loop_sess_get_index,
|
|
.write_pending = tcm_loop_write_pending,
|
|
.write_pending_status = tcm_loop_write_pending_status,
|
|
.set_default_node_attributes = tcm_loop_set_default_node_attributes,
|
|
.get_cmd_state = tcm_loop_get_cmd_state,
|
|
.queue_data_in = tcm_loop_queue_data_in,
|
|
.queue_status = tcm_loop_queue_status,
|
|
.queue_tm_rsp = tcm_loop_queue_tm_rsp,
|
|
.aborted_task = tcm_loop_aborted_task,
|
|
.fabric_make_wwn = tcm_loop_make_scsi_hba,
|
|
.fabric_drop_wwn = tcm_loop_drop_scsi_hba,
|
|
.fabric_make_tpg = tcm_loop_make_naa_tpg,
|
|
.fabric_drop_tpg = tcm_loop_drop_naa_tpg,
|
|
.fabric_post_link = tcm_loop_port_link,
|
|
.fabric_pre_unlink = tcm_loop_port_unlink,
|
|
.tfc_wwn_attrs = tcm_loop_wwn_attrs,
|
|
.tfc_tpg_base_attrs = tcm_loop_tpg_attrs,
|
|
.tfc_tpg_attrib_attrs = tcm_loop_tpg_attrib_attrs,
|
|
};
|
|
|
|
static int __init tcm_loop_fabric_init(void)
|
|
{
|
|
int ret = -ENOMEM;
|
|
|
|
tcm_loop_workqueue = alloc_workqueue("tcm_loop", 0, 0);
|
|
if (!tcm_loop_workqueue)
|
|
goto out;
|
|
|
|
tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache",
|
|
sizeof(struct tcm_loop_cmd),
|
|
__alignof__(struct tcm_loop_cmd),
|
|
0, NULL);
|
|
if (!tcm_loop_cmd_cache) {
|
|
pr_debug("kmem_cache_create() for"
|
|
" tcm_loop_cmd_cache failed\n");
|
|
goto out_destroy_workqueue;
|
|
}
|
|
|
|
ret = tcm_loop_alloc_core_bus();
|
|
if (ret)
|
|
goto out_destroy_cache;
|
|
|
|
ret = target_register_template(&loop_ops);
|
|
if (ret)
|
|
goto out_release_core_bus;
|
|
|
|
return 0;
|
|
|
|
out_release_core_bus:
|
|
tcm_loop_release_core_bus();
|
|
out_destroy_cache:
|
|
kmem_cache_destroy(tcm_loop_cmd_cache);
|
|
out_destroy_workqueue:
|
|
destroy_workqueue(tcm_loop_workqueue);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static void __exit tcm_loop_fabric_exit(void)
|
|
{
|
|
target_unregister_template(&loop_ops);
|
|
tcm_loop_release_core_bus();
|
|
kmem_cache_destroy(tcm_loop_cmd_cache);
|
|
destroy_workqueue(tcm_loop_workqueue);
|
|
}
|
|
|
|
MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module");
|
|
MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>");
|
|
MODULE_LICENSE("GPL");
|
|
module_init(tcm_loop_fabric_init);
|
|
module_exit(tcm_loop_fabric_exit);
|