8f9f44f895
This patch converts tcm_loop to use target_submit_cmd_map_sgls() for I/O submission and mapping of pre-allocated SGL memory from incoming scsi_cmnd -> se_cmd descriptors. This includes removing the original open-coded fabric uses of target core callers to support transport_generic_map_mem_to_cmd() between target_setup_cmd_from_cdb() and transport_handle_cdb_direct() logic. (v2: Use renamed target_submit_cmd_map_sgls) Reported-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
1425 lines
37 KiB
C
1425 lines
37 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 RisingTide Systems LLC.
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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 <target/target_core_fabric_configfs.h>
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#include <target/target_core_configfs.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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/* Local pointer to allocated TCM configfs fabric module */
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static struct target_fabric_configfs *tcm_loop_fabric_configfs;
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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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/*
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* Do not release struct se_cmd's containing a valid TMR
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* pointer. These will be released directly in tcm_loop_device_reset()
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* with transport_generic_free_cmd().
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*/
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if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
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return 0;
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/*
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* Release the struct se_cmd, which will make a callback to release
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* struct tcm_loop_cmd * in tcm_loop_deallocate_core_cmd()
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*/
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transport_generic_free_cmd(se_cmd, 0);
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return 1;
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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_proc_info(struct Scsi_Host *host, char *buffer,
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char **start, off_t offset,
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int length, int inout)
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{
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return sprintf(buffer, "tcm_loop_proc_info()\n");
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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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struct device *tcm_loop_primary;
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/*
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* Copied from drivers/scsi/libfc/fc_fcp.c:fc_change_queue_depth() and
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* drivers/scsi/libiscsi.c:iscsi_change_queue_depth()
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*/
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static int tcm_loop_change_queue_depth(
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struct scsi_device *sdev,
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int depth,
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int reason)
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{
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switch (reason) {
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case SCSI_QDEPTH_DEFAULT:
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scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
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break;
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case SCSI_QDEPTH_QFULL:
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scsi_track_queue_full(sdev, depth);
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break;
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case SCSI_QDEPTH_RAMP_UP:
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scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
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break;
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default:
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return -EOPNOTSUPP;
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}
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return sdev->queue_depth;
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}
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/*
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* Locate the SAM Task Attr from struct scsi_cmnd *
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*/
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static int tcm_loop_sam_attr(struct scsi_cmnd *sc)
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{
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if (sc->device->tagged_supported) {
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switch (sc->tag) {
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case HEAD_OF_QUEUE_TAG:
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return MSG_HEAD_TAG;
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case ORDERED_QUEUE_TAG:
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return MSG_ORDERED_TAG;
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default:
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break;
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}
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}
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return MSG_SIMPLE_TAG;
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}
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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;
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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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tl_nexus = tl_hba->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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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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scsi_bufflen(sc), tcm_loop_sam_attr(sc),
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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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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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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:%d 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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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_device_reset(struct scsi_cmnd *sc)
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{
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struct se_cmd *se_cmd = NULL;
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struct se_portal_group *se_tpg;
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struct se_session *se_sess;
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struct tcm_loop_cmd *tl_cmd = NULL;
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struct tcm_loop_hba *tl_hba;
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struct tcm_loop_nexus *tl_nexus;
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struct tcm_loop_tmr *tl_tmr = NULL;
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struct tcm_loop_tpg *tl_tpg;
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int ret = FAILED, rc;
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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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/*
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* Locate the tl_nexus and se_sess pointers
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*/
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tl_nexus = tl_hba->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 FAILED;
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}
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se_sess = tl_nexus->se_sess;
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/*
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* Locate the tl_tpg and se_tpg pointers 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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se_tpg = &tl_tpg->tl_se_tpg;
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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 FAILED;
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}
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tl_tmr = kzalloc(sizeof(struct tcm_loop_tmr), GFP_KERNEL);
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if (!tl_tmr) {
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pr_err("Unable to allocate memory for tl_tmr\n");
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goto release;
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}
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init_waitqueue_head(&tl_tmr->tl_tmr_wait);
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se_cmd = &tl_cmd->tl_se_cmd;
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/*
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* Initialize struct se_cmd descriptor from target_core_mod infrastructure
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*/
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transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 0,
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DMA_NONE, MSG_SIMPLE_TAG,
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&tl_cmd->tl_sense_buf[0]);
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rc = core_tmr_alloc_req(se_cmd, tl_tmr, TMR_LUN_RESET, GFP_KERNEL);
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if (rc < 0)
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goto release;
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/*
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* Locate the underlying TCM struct se_lun from sc->device->lun
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*/
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if (transport_lookup_tmr_lun(se_cmd, sc->device->lun) < 0)
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goto release;
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/*
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* Queue the TMR to TCM Core and sleep waiting for tcm_loop_queue_tm_rsp()
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* to wake us up.
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*/
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transport_generic_handle_tmr(se_cmd);
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wait_event(tl_tmr->tl_tmr_wait, atomic_read(&tl_tmr->tmr_complete));
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/*
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* The TMR LUN_RESET has completed, check the response status and
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* then release allocations.
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*/
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ret = (se_cmd->se_tmr_req->response == TMR_FUNCTION_COMPLETE) ?
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SUCCESS : FAILED;
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release:
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if (se_cmd)
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transport_generic_free_cmd(se_cmd, 1);
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else
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kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
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kfree(tl_tmr);
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return ret;
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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 int tcm_loop_slave_configure(struct scsi_device *sd)
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{
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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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.proc_info = tcm_loop_proc_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 = tcm_loop_change_queue_depth,
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.eh_device_reset_handler = tcm_loop_device_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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.slave_configure = tcm_loop_slave_configure,
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.module = THIS_MODULE,
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};
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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;
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tl_hba = to_tcm_loop_hba(dev);
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|
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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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/*
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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 = TL_SCSI_MAX_CMD_LEN;
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|
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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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}
|
|
|
|
static int tcm_loop_driver_remove(struct device *dev)
|
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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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* Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c
|
|
*/
|
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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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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);
|
|
|
|
ret = device_register(&tl_hba->dev);
|
|
if (ret) {
|
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pr_err("device_register() failed for"
|
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" tl_hba->dev: %d\n", ret);
|
|
return -ENODEV;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated
|
|
* tcm_loop SCSI bus.
|
|
*/
|
|
static int tcm_loop_alloc_core_bus(void)
|
|
{
|
|
int ret;
|
|
|
|
tcm_loop_primary = root_device_register("tcm_loop_0");
|
|
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);
|
|
}
|
|
|
|
ret = bus_register(&tcm_loop_lld_bus);
|
|
if (ret) {
|
|
pr_err("bus_register() failed for tcm_loop_lld_bus\n");
|
|
goto dev_unreg;
|
|
}
|
|
|
|
ret = driver_register(&tcm_loop_driverfs);
|
|
if (ret) {
|
|
pr_err("driver_register() failed for"
|
|
"tcm_loop_driverfs\n");
|
|
goto bus_unreg;
|
|
}
|
|
|
|
pr_debug("Initialized TCM Loop Core Bus\n");
|
|
return ret;
|
|
|
|
bus_unreg:
|
|
bus_unregister(&tcm_loop_lld_bus);
|
|
dev_unreg:
|
|
root_device_unregister(tcm_loop_primary);
|
|
return ret;
|
|
}
|
|
|
|
static void tcm_loop_release_core_bus(void)
|
|
{
|
|
driver_unregister(&tcm_loop_driverfs);
|
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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 u8 tcm_loop_get_fabric_proto_ident(struct se_portal_group *se_tpg)
|
|
{
|
|
struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
|
|
struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
|
|
/*
|
|
* tl_proto_id is set at tcm_loop_configfs.c:tcm_loop_make_scsi_hba()
|
|
* time based on the protocol dependent prefix of the passed configfs group.
|
|
*
|
|
* Based upon tl_proto_id, TCM_Loop emulates the requested fabric
|
|
* ProtocolID using target_core_fabric_lib.c symbols.
|
|
*/
|
|
switch (tl_hba->tl_proto_id) {
|
|
case SCSI_PROTOCOL_SAS:
|
|
return sas_get_fabric_proto_ident(se_tpg);
|
|
case SCSI_PROTOCOL_FCP:
|
|
return fc_get_fabric_proto_ident(se_tpg);
|
|
case SCSI_PROTOCOL_ISCSI:
|
|
return iscsi_get_fabric_proto_ident(se_tpg);
|
|
default:
|
|
pr_err("Unknown tl_proto_id: 0x%02x, using"
|
|
" SAS emulation\n", tl_hba->tl_proto_id);
|
|
break;
|
|
}
|
|
|
|
return sas_get_fabric_proto_ident(se_tpg);
|
|
}
|
|
|
|
static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg)
|
|
{
|
|
struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
|
|
/*
|
|
* Return the passed NAA identifier for the SAS Target Port
|
|
*/
|
|
return &tl_tpg->tl_hba->tl_wwn_address[0];
|
|
}
|
|
|
|
static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg)
|
|
{
|
|
struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
|
|
/*
|
|
* This Tag is used when forming SCSI Name identifier in EVPD=1 0x83
|
|
* to represent the SCSI Target Port.
|
|
*/
|
|
return tl_tpg->tl_tpgt;
|
|
}
|
|
|
|
static u32 tcm_loop_get_default_depth(struct se_portal_group *se_tpg)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static u32 tcm_loop_get_pr_transport_id(
|
|
struct se_portal_group *se_tpg,
|
|
struct se_node_acl *se_nacl,
|
|
struct t10_pr_registration *pr_reg,
|
|
int *format_code,
|
|
unsigned char *buf)
|
|
{
|
|
struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
|
|
struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
|
|
|
|
switch (tl_hba->tl_proto_id) {
|
|
case SCSI_PROTOCOL_SAS:
|
|
return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
|
|
format_code, buf);
|
|
case SCSI_PROTOCOL_FCP:
|
|
return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
|
|
format_code, buf);
|
|
case SCSI_PROTOCOL_ISCSI:
|
|
return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
|
|
format_code, buf);
|
|
default:
|
|
pr_err("Unknown tl_proto_id: 0x%02x, using"
|
|
" SAS emulation\n", tl_hba->tl_proto_id);
|
|
break;
|
|
}
|
|
|
|
return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
|
|
format_code, buf);
|
|
}
|
|
|
|
static u32 tcm_loop_get_pr_transport_id_len(
|
|
struct se_portal_group *se_tpg,
|
|
struct se_node_acl *se_nacl,
|
|
struct t10_pr_registration *pr_reg,
|
|
int *format_code)
|
|
{
|
|
struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
|
|
struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
|
|
|
|
switch (tl_hba->tl_proto_id) {
|
|
case SCSI_PROTOCOL_SAS:
|
|
return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
|
|
format_code);
|
|
case SCSI_PROTOCOL_FCP:
|
|
return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
|
|
format_code);
|
|
case SCSI_PROTOCOL_ISCSI:
|
|
return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
|
|
format_code);
|
|
default:
|
|
pr_err("Unknown tl_proto_id: 0x%02x, using"
|
|
" SAS emulation\n", tl_hba->tl_proto_id);
|
|
break;
|
|
}
|
|
|
|
return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
|
|
format_code);
|
|
}
|
|
|
|
/*
|
|
* Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above
|
|
* Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations.
|
|
*/
|
|
static char *tcm_loop_parse_pr_out_transport_id(
|
|
struct se_portal_group *se_tpg,
|
|
const char *buf,
|
|
u32 *out_tid_len,
|
|
char **port_nexus_ptr)
|
|
{
|
|
struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
|
|
struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
|
|
|
|
switch (tl_hba->tl_proto_id) {
|
|
case SCSI_PROTOCOL_SAS:
|
|
return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
|
|
port_nexus_ptr);
|
|
case SCSI_PROTOCOL_FCP:
|
|
return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
|
|
port_nexus_ptr);
|
|
case SCSI_PROTOCOL_ISCSI:
|
|
return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
|
|
port_nexus_ptr);
|
|
default:
|
|
pr_err("Unknown tl_proto_id: 0x%02x, using"
|
|
" SAS emulation\n", tl_hba->tl_proto_id);
|
|
break;
|
|
}
|
|
|
|
return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
|
|
port_nexus_ptr);
|
|
}
|
|
|
|
/*
|
|
* 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 struct se_node_acl *tcm_loop_tpg_alloc_fabric_acl(
|
|
struct se_portal_group *se_tpg)
|
|
{
|
|
struct tcm_loop_nacl *tl_nacl;
|
|
|
|
tl_nacl = kzalloc(sizeof(struct tcm_loop_nacl), GFP_KERNEL);
|
|
if (!tl_nacl) {
|
|
pr_err("Unable to allocate struct tcm_loop_nacl\n");
|
|
return NULL;
|
|
}
|
|
|
|
return &tl_nacl->se_node_acl;
|
|
}
|
|
|
|
static void tcm_loop_tpg_release_fabric_acl(
|
|
struct se_portal_group *se_tpg,
|
|
struct se_node_acl *se_nacl)
|
|
{
|
|
struct tcm_loop_nacl *tl_nacl = container_of(se_nacl,
|
|
struct tcm_loop_nacl, se_node_acl);
|
|
|
|
kfree(tl_nacl);
|
|
}
|
|
|
|
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 u32 tcm_loop_get_task_tag(struct se_cmd *se_cmd)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
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_shutdown_session(struct se_session *se_sess)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void tcm_loop_close_session(struct se_session *se_sess)
|
|
{
|
|
return;
|
|
};
|
|
|
|
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 int tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd)
|
|
{
|
|
struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
|
|
struct tcm_loop_tmr *tl_tmr = se_tmr->fabric_tmr_ptr;
|
|
/*
|
|
* The SCSI EH thread will be sleeping on se_tmr->tl_tmr_wait, go ahead
|
|
* and wake up the wait_queue_head_t in tcm_loop_device_reset()
|
|
*/
|
|
atomic_set(&tl_tmr->tmr_complete, 1);
|
|
wake_up(&tl_tmr->tl_tmr_wait);
|
|
return 0;
|
|
}
|
|
|
|
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(&tl_tpg->tl_tpg_port_count);
|
|
smp_mb__after_atomic_inc();
|
|
/*
|
|
* 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:"
|
|
"%d\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(&tl_tpg->tl_tpg_port_count);
|
|
smp_mb__after_atomic_dec();
|
|
|
|
pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n");
|
|
}
|
|
|
|
/* End items for tcm_loop_port_cit */
|
|
|
|
/* Start items for tcm_loop_nexus_cit */
|
|
|
|
static int tcm_loop_make_nexus(
|
|
struct tcm_loop_tpg *tl_tpg,
|
|
const char *name)
|
|
{
|
|
struct se_portal_group *se_tpg;
|
|
struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
|
|
struct tcm_loop_nexus *tl_nexus;
|
|
int ret = -ENOMEM;
|
|
|
|
if (tl_tpg->tl_hba->tl_nexus) {
|
|
pr_debug("tl_tpg->tl_hba->tl_nexus already exists\n");
|
|
return -EEXIST;
|
|
}
|
|
se_tpg = &tl_tpg->tl_se_tpg;
|
|
|
|
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;
|
|
}
|
|
/*
|
|
* Initialize the struct se_session pointer
|
|
*/
|
|
tl_nexus->se_sess = transport_init_session();
|
|
if (IS_ERR(tl_nexus->se_sess)) {
|
|
ret = PTR_ERR(tl_nexus->se_sess);
|
|
goto out;
|
|
}
|
|
/*
|
|
* Since we are running in 'demo mode' this call with generate a
|
|
* struct se_node_acl for the tcm_loop struct se_portal_group with the SCSI
|
|
* Initiator port name of the passed configfs group 'name'.
|
|
*/
|
|
tl_nexus->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
|
|
se_tpg, (unsigned char *)name);
|
|
if (!tl_nexus->se_sess->se_node_acl) {
|
|
transport_free_session(tl_nexus->se_sess);
|
|
goto out;
|
|
}
|
|
/*
|
|
* Now, register the SAS I_T Nexus as active with the call to
|
|
* transport_register_session()
|
|
*/
|
|
__transport_register_session(se_tpg, tl_nexus->se_sess->se_node_acl,
|
|
tl_nexus->se_sess, tl_nexus);
|
|
tl_tpg->tl_hba->tl_nexus = tl_nexus;
|
|
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;
|
|
|
|
out:
|
|
kfree(tl_nexus);
|
|
return ret;
|
|
}
|
|
|
|
static int tcm_loop_drop_nexus(
|
|
struct tcm_loop_tpg *tpg)
|
|
{
|
|
struct se_session *se_sess;
|
|
struct tcm_loop_nexus *tl_nexus;
|
|
struct tcm_loop_hba *tl_hba = tpg->tl_hba;
|
|
|
|
tl_nexus = tpg->tl_hba->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(tl_hba),
|
|
tl_nexus->se_sess->se_node_acl->initiatorname);
|
|
/*
|
|
* Release the SCSI I_T Nexus to the emulated SAS Target Port
|
|
*/
|
|
transport_deregister_session(tl_nexus->se_sess);
|
|
tpg->tl_hba->tl_nexus = NULL;
|
|
kfree(tl_nexus);
|
|
return 0;
|
|
}
|
|
|
|
/* End items for tcm_loop_nexus_cit */
|
|
|
|
static ssize_t tcm_loop_tpg_show_nexus(
|
|
struct se_portal_group *se_tpg,
|
|
char *page)
|
|
{
|
|
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_hba->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_store_nexus(
|
|
struct se_portal_group *se_tpg,
|
|
const char *page,
|
|
size_t count)
|
|
{
|
|
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;
|
|
}
|
|
|
|
TF_TPG_BASE_ATTR(tcm_loop, nexus, S_IRUGO | S_IWUSR);
|
|
|
|
static struct configfs_attribute *tcm_loop_tpg_attrs[] = {
|
|
&tcm_loop_tpg_nexus.attr,
|
|
NULL,
|
|
};
|
|
|
|
/* Start items for tcm_loop_naa_cit */
|
|
|
|
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;
|
|
char *tpgt_str, *end_ptr;
|
|
int ret;
|
|
unsigned short int tpgt;
|
|
|
|
tpgt_str = strstr(name, "tpgt_");
|
|
if (!tpgt_str) {
|
|
pr_err("Unable to locate \"tpgt_#\" directory"
|
|
" group\n");
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
tpgt_str += 5; /* Skip ahead of "tpgt_" */
|
|
tpgt = (unsigned short int) simple_strtoul(tpgt_str, &end_ptr, 0);
|
|
|
|
if (tpgt >= TL_TPGS_PER_HBA) {
|
|
pr_err("Passed tpgt: %hu 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 SAS TCM Target Endpoint
|
|
*/
|
|
ret = core_tpg_register(&tcm_loop_fabric_configfs->tf_ops,
|
|
wwn, &tl_tpg->tl_se_tpg, tl_tpg,
|
|
TRANSPORT_TPG_TYPE_NORMAL);
|
|
if (ret < 0)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
pr_debug("TCM_Loop_ConfigFS: Allocated 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);
|
|
|
|
return &tl_tpg->tl_se_tpg;
|
|
}
|
|
|
|
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 SAS link if present
|
|
*/
|
|
tcm_loop_drop_nexus(tl_tpg);
|
|
/*
|
|
* Deregister the tl_tpg as a emulated SAS 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 */
|
|
|
|
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);
|
|
}
|
|
|
|
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"
|
|
" SAS Address: %s at Linux/SCSI Host ID: %d\n",
|
|
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_show_attr_version(
|
|
struct target_fabric_configfs *tf,
|
|
char *page)
|
|
{
|
|
return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION);
|
|
}
|
|
|
|
TF_WWN_ATTR_RO(tcm_loop, version);
|
|
|
|
static struct configfs_attribute *tcm_loop_wwn_attrs[] = {
|
|
&tcm_loop_wwn_version.attr,
|
|
NULL,
|
|
};
|
|
|
|
/* End items for tcm_loop_cit */
|
|
|
|
static int tcm_loop_register_configfs(void)
|
|
{
|
|
struct target_fabric_configfs *fabric;
|
|
int ret;
|
|
/*
|
|
* Set the TCM Loop HBA counter to zero
|
|
*/
|
|
tcm_loop_hba_no_cnt = 0;
|
|
/*
|
|
* Register the top level struct config_item_type with TCM core
|
|
*/
|
|
fabric = target_fabric_configfs_init(THIS_MODULE, "loopback");
|
|
if (IS_ERR(fabric)) {
|
|
pr_err("tcm_loop_register_configfs() failed!\n");
|
|
return PTR_ERR(fabric);
|
|
}
|
|
/*
|
|
* Setup the fabric API of function pointers used by target_core_mod
|
|
*/
|
|
fabric->tf_ops.get_fabric_name = &tcm_loop_get_fabric_name;
|
|
fabric->tf_ops.get_fabric_proto_ident = &tcm_loop_get_fabric_proto_ident;
|
|
fabric->tf_ops.tpg_get_wwn = &tcm_loop_get_endpoint_wwn;
|
|
fabric->tf_ops.tpg_get_tag = &tcm_loop_get_tag;
|
|
fabric->tf_ops.tpg_get_default_depth = &tcm_loop_get_default_depth;
|
|
fabric->tf_ops.tpg_get_pr_transport_id = &tcm_loop_get_pr_transport_id;
|
|
fabric->tf_ops.tpg_get_pr_transport_id_len =
|
|
&tcm_loop_get_pr_transport_id_len;
|
|
fabric->tf_ops.tpg_parse_pr_out_transport_id =
|
|
&tcm_loop_parse_pr_out_transport_id;
|
|
fabric->tf_ops.tpg_check_demo_mode = &tcm_loop_check_demo_mode;
|
|
fabric->tf_ops.tpg_check_demo_mode_cache =
|
|
&tcm_loop_check_demo_mode_cache;
|
|
fabric->tf_ops.tpg_check_demo_mode_write_protect =
|
|
&tcm_loop_check_demo_mode_write_protect;
|
|
fabric->tf_ops.tpg_check_prod_mode_write_protect =
|
|
&tcm_loop_check_prod_mode_write_protect;
|
|
/*
|
|
* The TCM loopback fabric module runs in demo-mode to a local
|
|
* virtual SCSI device, so fabric dependent initator ACLs are
|
|
* not required.
|
|
*/
|
|
fabric->tf_ops.tpg_alloc_fabric_acl = &tcm_loop_tpg_alloc_fabric_acl;
|
|
fabric->tf_ops.tpg_release_fabric_acl =
|
|
&tcm_loop_tpg_release_fabric_acl;
|
|
fabric->tf_ops.tpg_get_inst_index = &tcm_loop_get_inst_index;
|
|
/*
|
|
* Used for setting up remaining TCM resources in process context
|
|
*/
|
|
fabric->tf_ops.check_stop_free = &tcm_loop_check_stop_free;
|
|
fabric->tf_ops.release_cmd = &tcm_loop_release_cmd;
|
|
fabric->tf_ops.shutdown_session = &tcm_loop_shutdown_session;
|
|
fabric->tf_ops.close_session = &tcm_loop_close_session;
|
|
fabric->tf_ops.sess_get_index = &tcm_loop_sess_get_index;
|
|
fabric->tf_ops.sess_get_initiator_sid = NULL;
|
|
fabric->tf_ops.write_pending = &tcm_loop_write_pending;
|
|
fabric->tf_ops.write_pending_status = &tcm_loop_write_pending_status;
|
|
/*
|
|
* Not used for TCM loopback
|
|
*/
|
|
fabric->tf_ops.set_default_node_attributes =
|
|
&tcm_loop_set_default_node_attributes;
|
|
fabric->tf_ops.get_task_tag = &tcm_loop_get_task_tag;
|
|
fabric->tf_ops.get_cmd_state = &tcm_loop_get_cmd_state;
|
|
fabric->tf_ops.queue_data_in = &tcm_loop_queue_data_in;
|
|
fabric->tf_ops.queue_status = &tcm_loop_queue_status;
|
|
fabric->tf_ops.queue_tm_rsp = &tcm_loop_queue_tm_rsp;
|
|
|
|
/*
|
|
* Setup function pointers for generic logic in target_core_fabric_configfs.c
|
|
*/
|
|
fabric->tf_ops.fabric_make_wwn = &tcm_loop_make_scsi_hba;
|
|
fabric->tf_ops.fabric_drop_wwn = &tcm_loop_drop_scsi_hba;
|
|
fabric->tf_ops.fabric_make_tpg = &tcm_loop_make_naa_tpg;
|
|
fabric->tf_ops.fabric_drop_tpg = &tcm_loop_drop_naa_tpg;
|
|
/*
|
|
* fabric_post_link() and fabric_pre_unlink() are used for
|
|
* registration and release of TCM Loop Virtual SCSI LUNs.
|
|
*/
|
|
fabric->tf_ops.fabric_post_link = &tcm_loop_port_link;
|
|
fabric->tf_ops.fabric_pre_unlink = &tcm_loop_port_unlink;
|
|
fabric->tf_ops.fabric_make_np = NULL;
|
|
fabric->tf_ops.fabric_drop_np = NULL;
|
|
/*
|
|
* Setup default attribute lists for various fabric->tf_cit_tmpl
|
|
*/
|
|
TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = tcm_loop_wwn_attrs;
|
|
TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = tcm_loop_tpg_attrs;
|
|
TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL;
|
|
TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL;
|
|
TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL;
|
|
/*
|
|
* Once fabric->tf_ops has been setup, now register the fabric for
|
|
* use within TCM
|
|
*/
|
|
ret = target_fabric_configfs_register(fabric);
|
|
if (ret < 0) {
|
|
pr_err("target_fabric_configfs_register() for"
|
|
" TCM_Loop failed!\n");
|
|
target_fabric_configfs_free(fabric);
|
|
return -1;
|
|
}
|
|
/*
|
|
* Setup our local pointer to *fabric.
|
|
*/
|
|
tcm_loop_fabric_configfs = fabric;
|
|
pr_debug("TCM_LOOP[0] - Set fabric ->"
|
|
" tcm_loop_fabric_configfs\n");
|
|
return 0;
|
|
}
|
|
|
|
static void tcm_loop_deregister_configfs(void)
|
|
{
|
|
if (!tcm_loop_fabric_configfs)
|
|
return;
|
|
|
|
target_fabric_configfs_deregister(tcm_loop_fabric_configfs);
|
|
tcm_loop_fabric_configfs = NULL;
|
|
pr_debug("TCM_LOOP[0] - Cleared"
|
|
" tcm_loop_fabric_configfs\n");
|
|
}
|
|
|
|
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 = tcm_loop_register_configfs();
|
|
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)
|
|
{
|
|
tcm_loop_deregister_configfs();
|
|
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);
|