717 lines
18 KiB
C
717 lines
18 KiB
C
/*
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* Copyright (c) 2010 Cisco Systems, Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/* XXX TBD some includes may be extraneous */
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/version.h>
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#include <generated/utsrelease.h>
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#include <linux/utsname.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/kthread.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/configfs.h>
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#include <linux/ctype.h>
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#include <linux/hash.h>
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#include <asm/unaligned.h>
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#include <scsi/scsi.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 <scsi/scsi_tcq.h>
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#include <scsi/libfc.h>
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#include <scsi/fc_encode.h>
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#include <target/target_core_base.h>
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#include <target/target_core_transport.h>
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#include <target/target_core_fabric_ops.h>
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#include <target/target_core_device.h>
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#include <target/target_core_tpg.h>
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#include <target/target_core_configfs.h>
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#include <target/target_core_base.h>
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#include <target/target_core_tmr.h>
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#include <target/configfs_macros.h>
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#include "tcm_fc.h"
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/*
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* Dump cmd state for debugging.
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*/
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void ft_dump_cmd(struct ft_cmd *cmd, const char *caller)
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{
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struct fc_exch *ep;
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struct fc_seq *sp;
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struct se_cmd *se_cmd;
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struct se_mem *mem;
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struct se_transport_task *task;
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if (!(ft_debug_logging & FT_DEBUG_IO))
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return;
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se_cmd = &cmd->se_cmd;
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printk(KERN_INFO "%s: cmd %p state %d sess %p seq %p se_cmd %p\n",
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caller, cmd, cmd->state, cmd->sess, cmd->seq, se_cmd);
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printk(KERN_INFO "%s: cmd %p cdb %p\n",
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caller, cmd, cmd->cdb);
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printk(KERN_INFO "%s: cmd %p lun %d\n", caller, cmd, cmd->lun);
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task = T_TASK(se_cmd);
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printk(KERN_INFO "%s: cmd %p task %p se_num %u buf %p len %u se_cmd_flags <0x%x>\n",
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caller, cmd, task, task->t_tasks_se_num,
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task->t_task_buf, se_cmd->data_length, se_cmd->se_cmd_flags);
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if (task->t_mem_list)
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list_for_each_entry(mem, task->t_mem_list, se_list)
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printk(KERN_INFO "%s: cmd %p mem %p page %p "
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"len 0x%x off 0x%x\n",
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caller, cmd, mem,
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mem->se_page, mem->se_len, mem->se_off);
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sp = cmd->seq;
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if (sp) {
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ep = fc_seq_exch(sp);
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printk(KERN_INFO "%s: cmd %p sid %x did %x "
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"ox_id %x rx_id %x seq_id %x e_stat %x\n",
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caller, cmd, ep->sid, ep->did, ep->oxid, ep->rxid,
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sp->id, ep->esb_stat);
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}
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print_hex_dump(KERN_INFO, "ft_dump_cmd ", DUMP_PREFIX_NONE,
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16, 4, cmd->cdb, MAX_COMMAND_SIZE, 0);
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}
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static void ft_queue_cmd(struct ft_sess *sess, struct ft_cmd *cmd)
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{
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struct se_queue_obj *qobj;
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unsigned long flags;
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qobj = &sess->tport->tpg->qobj;
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spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
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list_add_tail(&cmd->se_req.qr_list, &qobj->qobj_list);
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spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
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atomic_inc(&qobj->queue_cnt);
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wake_up_interruptible(&qobj->thread_wq);
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}
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static struct ft_cmd *ft_dequeue_cmd(struct se_queue_obj *qobj)
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{
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unsigned long flags;
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struct se_queue_req *qr;
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spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
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if (list_empty(&qobj->qobj_list)) {
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spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
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return NULL;
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}
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qr = list_first_entry(&qobj->qobj_list, struct se_queue_req, qr_list);
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list_del(&qr->qr_list);
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atomic_dec(&qobj->queue_cnt);
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spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
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return container_of(qr, struct ft_cmd, se_req);
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}
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static void ft_free_cmd(struct ft_cmd *cmd)
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{
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struct fc_frame *fp;
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struct fc_lport *lport;
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if (!cmd)
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return;
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fp = cmd->req_frame;
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lport = fr_dev(fp);
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if (fr_seq(fp))
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lport->tt.seq_release(fr_seq(fp));
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fc_frame_free(fp);
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ft_sess_put(cmd->sess); /* undo get from lookup at recv */
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kfree(cmd);
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}
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void ft_release_cmd(struct se_cmd *se_cmd)
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{
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struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
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ft_free_cmd(cmd);
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}
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void ft_check_stop_free(struct se_cmd *se_cmd)
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{
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transport_generic_free_cmd(se_cmd, 0, 1, 0);
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}
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/*
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* Send response.
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*/
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int ft_queue_status(struct se_cmd *se_cmd)
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{
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struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
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struct fc_frame *fp;
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struct fcp_resp_with_ext *fcp;
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struct fc_lport *lport;
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struct fc_exch *ep;
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size_t len;
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ft_dump_cmd(cmd, __func__);
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ep = fc_seq_exch(cmd->seq);
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lport = ep->lp;
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len = sizeof(*fcp) + se_cmd->scsi_sense_length;
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fp = fc_frame_alloc(lport, len);
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if (!fp) {
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/* XXX shouldn't just drop it - requeue and retry? */
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return 0;
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}
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fcp = fc_frame_payload_get(fp, len);
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memset(fcp, 0, len);
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fcp->resp.fr_status = se_cmd->scsi_status;
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len = se_cmd->scsi_sense_length;
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if (len) {
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fcp->resp.fr_flags |= FCP_SNS_LEN_VAL;
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fcp->ext.fr_sns_len = htonl(len);
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memcpy((fcp + 1), se_cmd->sense_buffer, len);
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}
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/*
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* Test underflow and overflow with one mask. Usually both are off.
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* Bidirectional commands are not handled yet.
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*/
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if (se_cmd->se_cmd_flags & (SCF_OVERFLOW_BIT | SCF_UNDERFLOW_BIT)) {
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if (se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT)
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fcp->resp.fr_flags |= FCP_RESID_OVER;
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else
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fcp->resp.fr_flags |= FCP_RESID_UNDER;
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fcp->ext.fr_resid = cpu_to_be32(se_cmd->residual_count);
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}
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/*
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* Send response.
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*/
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cmd->seq = lport->tt.seq_start_next(cmd->seq);
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fc_fill_fc_hdr(fp, FC_RCTL_DD_CMD_STATUS, ep->did, ep->sid, FC_TYPE_FCP,
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FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ, 0);
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lport->tt.seq_send(lport, cmd->seq, fp);
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lport->tt.exch_done(cmd->seq);
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return 0;
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}
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int ft_write_pending_status(struct se_cmd *se_cmd)
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{
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struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
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return cmd->write_data_len != se_cmd->data_length;
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}
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/*
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* Send TX_RDY (transfer ready).
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*/
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int ft_write_pending(struct se_cmd *se_cmd)
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{
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struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
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struct fc_frame *fp;
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struct fcp_txrdy *txrdy;
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struct fc_lport *lport;
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struct fc_exch *ep;
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struct fc_frame_header *fh;
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u32 f_ctl;
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ft_dump_cmd(cmd, __func__);
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ep = fc_seq_exch(cmd->seq);
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lport = ep->lp;
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fp = fc_frame_alloc(lport, sizeof(*txrdy));
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if (!fp)
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return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
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txrdy = fc_frame_payload_get(fp, sizeof(*txrdy));
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memset(txrdy, 0, sizeof(*txrdy));
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txrdy->ft_burst_len = htonl(se_cmd->data_length);
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cmd->seq = lport->tt.seq_start_next(cmd->seq);
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fc_fill_fc_hdr(fp, FC_RCTL_DD_DATA_DESC, ep->did, ep->sid, FC_TYPE_FCP,
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FC_FC_EX_CTX | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);
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fh = fc_frame_header_get(fp);
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f_ctl = ntoh24(fh->fh_f_ctl);
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/* Only if it is 'Exchange Responder' */
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if (f_ctl & FC_FC_EX_CTX) {
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/* Target is 'exchange responder' and sending XFER_READY
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* to 'exchange initiator (initiator)'
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*/
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if ((ep->xid <= lport->lro_xid) &&
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(fh->fh_r_ctl == FC_RCTL_DD_DATA_DESC)) {
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if (se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
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/*
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* Map se_mem list to scatterlist, so that
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* DDP can be setup. DDP setup function require
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* scatterlist. se_mem_list is internal to
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* TCM/LIO target
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*/
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transport_do_task_sg_chain(se_cmd);
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cmd->sg = T_TASK(se_cmd)->t_tasks_sg_chained;
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cmd->sg_cnt =
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T_TASK(se_cmd)->t_tasks_sg_chained_no;
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}
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if (cmd->sg && lport->tt.ddp_setup(lport, ep->xid,
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cmd->sg, cmd->sg_cnt))
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cmd->was_ddp_setup = 1;
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}
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}
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lport->tt.seq_send(lport, cmd->seq, fp);
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return 0;
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}
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u32 ft_get_task_tag(struct se_cmd *se_cmd)
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{
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struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
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return fc_seq_exch(cmd->seq)->rxid;
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}
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int ft_get_cmd_state(struct se_cmd *se_cmd)
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{
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struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
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return cmd->state;
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}
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int ft_is_state_remove(struct se_cmd *se_cmd)
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{
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return 0; /* XXX TBD */
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}
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void ft_new_cmd_failure(struct se_cmd *se_cmd)
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{
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/* XXX TBD */
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printk(KERN_INFO "%s: se_cmd %p\n", __func__, se_cmd);
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}
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/*
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* FC sequence response handler for follow-on sequences (data) and aborts.
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*/
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static void ft_recv_seq(struct fc_seq *sp, struct fc_frame *fp, void *arg)
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{
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struct ft_cmd *cmd = arg;
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struct fc_frame_header *fh;
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if (IS_ERR(fp)) {
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/* XXX need to find cmd if queued */
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cmd->se_cmd.t_state = TRANSPORT_REMOVE;
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cmd->seq = NULL;
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transport_generic_free_cmd(&cmd->se_cmd, 0, 1, 0);
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return;
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}
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fh = fc_frame_header_get(fp);
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switch (fh->fh_r_ctl) {
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case FC_RCTL_DD_SOL_DATA: /* write data */
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ft_recv_write_data(cmd, fp);
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break;
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case FC_RCTL_DD_UNSOL_CTL: /* command */
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case FC_RCTL_DD_SOL_CTL: /* transfer ready */
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case FC_RCTL_DD_DATA_DESC: /* transfer ready */
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default:
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printk(KERN_INFO "%s: unhandled frame r_ctl %x\n",
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__func__, fh->fh_r_ctl);
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fc_frame_free(fp);
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transport_generic_free_cmd(&cmd->se_cmd, 0, 1, 0);
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break;
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}
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}
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/*
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* Send a FCP response including SCSI status and optional FCP rsp_code.
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* status is SAM_STAT_GOOD (zero) iff code is valid.
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* This is used in error cases, such as allocation failures.
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*/
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static void ft_send_resp_status(struct fc_lport *lport,
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const struct fc_frame *rx_fp,
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u32 status, enum fcp_resp_rsp_codes code)
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{
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struct fc_frame *fp;
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struct fc_seq *sp;
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const struct fc_frame_header *fh;
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size_t len;
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struct fcp_resp_with_ext *fcp;
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struct fcp_resp_rsp_info *info;
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fh = fc_frame_header_get(rx_fp);
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FT_IO_DBG("FCP error response: did %x oxid %x status %x code %x\n",
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ntoh24(fh->fh_s_id), ntohs(fh->fh_ox_id), status, code);
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len = sizeof(*fcp);
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if (status == SAM_STAT_GOOD)
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len += sizeof(*info);
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fp = fc_frame_alloc(lport, len);
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if (!fp)
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return;
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fcp = fc_frame_payload_get(fp, len);
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memset(fcp, 0, len);
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fcp->resp.fr_status = status;
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if (status == SAM_STAT_GOOD) {
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fcp->ext.fr_rsp_len = htonl(sizeof(*info));
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fcp->resp.fr_flags |= FCP_RSP_LEN_VAL;
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info = (struct fcp_resp_rsp_info *)(fcp + 1);
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info->rsp_code = code;
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}
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fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_DD_CMD_STATUS, 0);
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sp = fr_seq(fp);
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if (sp)
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lport->tt.seq_send(lport, sp, fp);
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else
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lport->tt.frame_send(lport, fp);
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}
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/*
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* Send error or task management response.
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* Always frees the cmd and associated state.
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*/
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static void ft_send_resp_code(struct ft_cmd *cmd, enum fcp_resp_rsp_codes code)
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{
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ft_send_resp_status(cmd->sess->tport->lport,
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cmd->req_frame, SAM_STAT_GOOD, code);
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ft_free_cmd(cmd);
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}
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/*
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* Handle Task Management Request.
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*/
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static void ft_send_tm(struct ft_cmd *cmd)
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{
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struct se_tmr_req *tmr;
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struct fcp_cmnd *fcp;
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struct ft_sess *sess;
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u8 tm_func;
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fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp));
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switch (fcp->fc_tm_flags) {
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case FCP_TMF_LUN_RESET:
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tm_func = TMR_LUN_RESET;
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break;
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case FCP_TMF_TGT_RESET:
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tm_func = TMR_TARGET_WARM_RESET;
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break;
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case FCP_TMF_CLR_TASK_SET:
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tm_func = TMR_CLEAR_TASK_SET;
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break;
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case FCP_TMF_ABT_TASK_SET:
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tm_func = TMR_ABORT_TASK_SET;
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break;
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case FCP_TMF_CLR_ACA:
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tm_func = TMR_CLEAR_ACA;
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break;
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default:
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/*
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* FCP4r01 indicates having a combination of
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* tm_flags set is invalid.
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*/
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FT_TM_DBG("invalid FCP tm_flags %x\n", fcp->fc_tm_flags);
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ft_send_resp_code(cmd, FCP_CMND_FIELDS_INVALID);
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return;
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}
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FT_TM_DBG("alloc tm cmd fn %d\n", tm_func);
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tmr = core_tmr_alloc_req(&cmd->se_cmd, cmd, tm_func);
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if (!tmr) {
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FT_TM_DBG("alloc failed\n");
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ft_send_resp_code(cmd, FCP_TMF_FAILED);
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return;
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}
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cmd->se_cmd.se_tmr_req = tmr;
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switch (fcp->fc_tm_flags) {
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case FCP_TMF_LUN_RESET:
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cmd->lun = scsilun_to_int((struct scsi_lun *)fcp->fc_lun);
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if (transport_get_lun_for_tmr(&cmd->se_cmd, cmd->lun) < 0) {
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/*
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* Make sure to clean up newly allocated TMR request
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* since "unable to handle TMR request because failed
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* to get to LUN"
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*/
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FT_TM_DBG("Failed to get LUN for TMR func %d, "
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"se_cmd %p, unpacked_lun %d\n",
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tm_func, &cmd->se_cmd, cmd->lun);
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ft_dump_cmd(cmd, __func__);
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sess = cmd->sess;
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transport_send_check_condition_and_sense(&cmd->se_cmd,
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cmd->se_cmd.scsi_sense_reason, 0);
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transport_generic_free_cmd(&cmd->se_cmd, 0, 1, 0);
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ft_sess_put(sess);
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return;
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}
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break;
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case FCP_TMF_TGT_RESET:
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case FCP_TMF_CLR_TASK_SET:
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case FCP_TMF_ABT_TASK_SET:
|
|
case FCP_TMF_CLR_ACA:
|
|
break;
|
|
default:
|
|
return;
|
|
}
|
|
transport_generic_handle_tmr(&cmd->se_cmd);
|
|
}
|
|
|
|
/*
|
|
* Send status from completed task management request.
|
|
*/
|
|
int ft_queue_tm_resp(struct se_cmd *se_cmd)
|
|
{
|
|
struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
|
|
struct se_tmr_req *tmr = se_cmd->se_tmr_req;
|
|
enum fcp_resp_rsp_codes code;
|
|
|
|
switch (tmr->response) {
|
|
case TMR_FUNCTION_COMPLETE:
|
|
code = FCP_TMF_CMPL;
|
|
break;
|
|
case TMR_LUN_DOES_NOT_EXIST:
|
|
code = FCP_TMF_INVALID_LUN;
|
|
break;
|
|
case TMR_FUNCTION_REJECTED:
|
|
code = FCP_TMF_REJECTED;
|
|
break;
|
|
case TMR_TASK_DOES_NOT_EXIST:
|
|
case TMR_TASK_STILL_ALLEGIANT:
|
|
case TMR_TASK_FAILOVER_NOT_SUPPORTED:
|
|
case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
|
|
case TMR_FUNCTION_AUTHORIZATION_FAILED:
|
|
default:
|
|
code = FCP_TMF_FAILED;
|
|
break;
|
|
}
|
|
FT_TM_DBG("tmr fn %d resp %d fcp code %d\n",
|
|
tmr->function, tmr->response, code);
|
|
ft_send_resp_code(cmd, code);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Handle incoming FCP command.
|
|
*/
|
|
static void ft_recv_cmd(struct ft_sess *sess, struct fc_frame *fp)
|
|
{
|
|
struct ft_cmd *cmd;
|
|
struct fc_lport *lport = sess->tport->lport;
|
|
|
|
cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
|
|
if (!cmd)
|
|
goto busy;
|
|
cmd->sess = sess;
|
|
cmd->seq = lport->tt.seq_assign(lport, fp);
|
|
if (!cmd->seq) {
|
|
kfree(cmd);
|
|
goto busy;
|
|
}
|
|
cmd->req_frame = fp; /* hold frame during cmd */
|
|
ft_queue_cmd(sess, cmd);
|
|
return;
|
|
|
|
busy:
|
|
FT_IO_DBG("cmd or seq allocation failure - sending BUSY\n");
|
|
ft_send_resp_status(lport, fp, SAM_STAT_BUSY, 0);
|
|
fc_frame_free(fp);
|
|
ft_sess_put(sess); /* undo get from lookup */
|
|
}
|
|
|
|
|
|
/*
|
|
* Handle incoming FCP frame.
|
|
* Caller has verified that the frame is type FCP.
|
|
*/
|
|
void ft_recv_req(struct ft_sess *sess, struct fc_frame *fp)
|
|
{
|
|
struct fc_frame_header *fh = fc_frame_header_get(fp);
|
|
|
|
switch (fh->fh_r_ctl) {
|
|
case FC_RCTL_DD_UNSOL_CMD: /* command */
|
|
ft_recv_cmd(sess, fp);
|
|
break;
|
|
case FC_RCTL_DD_SOL_DATA: /* write data */
|
|
case FC_RCTL_DD_UNSOL_CTL:
|
|
case FC_RCTL_DD_SOL_CTL:
|
|
case FC_RCTL_DD_DATA_DESC: /* transfer ready */
|
|
case FC_RCTL_ELS4_REQ: /* SRR, perhaps */
|
|
default:
|
|
printk(KERN_INFO "%s: unhandled frame r_ctl %x\n",
|
|
__func__, fh->fh_r_ctl);
|
|
fc_frame_free(fp);
|
|
ft_sess_put(sess); /* undo get from lookup */
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Send new command to target.
|
|
*/
|
|
static void ft_send_cmd(struct ft_cmd *cmd)
|
|
{
|
|
struct fc_frame_header *fh = fc_frame_header_get(cmd->req_frame);
|
|
struct se_cmd *se_cmd;
|
|
struct fcp_cmnd *fcp;
|
|
int data_dir;
|
|
u32 data_len;
|
|
int task_attr;
|
|
int ret;
|
|
|
|
fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp));
|
|
if (!fcp)
|
|
goto err;
|
|
|
|
if (fcp->fc_flags & FCP_CFL_LEN_MASK)
|
|
goto err; /* not handling longer CDBs yet */
|
|
|
|
if (fcp->fc_tm_flags) {
|
|
task_attr = FCP_PTA_SIMPLE;
|
|
data_dir = DMA_NONE;
|
|
data_len = 0;
|
|
} else {
|
|
switch (fcp->fc_flags & (FCP_CFL_RDDATA | FCP_CFL_WRDATA)) {
|
|
case 0:
|
|
data_dir = DMA_NONE;
|
|
break;
|
|
case FCP_CFL_RDDATA:
|
|
data_dir = DMA_FROM_DEVICE;
|
|
break;
|
|
case FCP_CFL_WRDATA:
|
|
data_dir = DMA_TO_DEVICE;
|
|
break;
|
|
case FCP_CFL_WRDATA | FCP_CFL_RDDATA:
|
|
goto err; /* TBD not supported by tcm_fc yet */
|
|
}
|
|
/*
|
|
* Locate the SAM Task Attr from fc_pri_ta
|
|
*/
|
|
switch (fcp->fc_pri_ta & FCP_PTA_MASK) {
|
|
case FCP_PTA_HEADQ:
|
|
task_attr = MSG_HEAD_TAG;
|
|
break;
|
|
case FCP_PTA_ORDERED:
|
|
task_attr = MSG_ORDERED_TAG;
|
|
break;
|
|
case FCP_PTA_ACA:
|
|
task_attr = MSG_ACA_TAG;
|
|
break;
|
|
case FCP_PTA_SIMPLE: /* Fallthrough */
|
|
default:
|
|
task_attr = MSG_SIMPLE_TAG;
|
|
}
|
|
|
|
|
|
task_attr = fcp->fc_pri_ta & FCP_PTA_MASK;
|
|
data_len = ntohl(fcp->fc_dl);
|
|
cmd->cdb = fcp->fc_cdb;
|
|
}
|
|
|
|
se_cmd = &cmd->se_cmd;
|
|
/*
|
|
* Initialize struct se_cmd descriptor from target_core_mod
|
|
* infrastructure
|
|
*/
|
|
transport_init_se_cmd(se_cmd, &ft_configfs->tf_ops, cmd->sess->se_sess,
|
|
data_len, data_dir, task_attr,
|
|
&cmd->ft_sense_buffer[0]);
|
|
/*
|
|
* Check for FCP task management flags
|
|
*/
|
|
if (fcp->fc_tm_flags) {
|
|
ft_send_tm(cmd);
|
|
return;
|
|
}
|
|
|
|
fc_seq_exch(cmd->seq)->lp->tt.seq_set_resp(cmd->seq, ft_recv_seq, cmd);
|
|
|
|
cmd->lun = scsilun_to_int((struct scsi_lun *)fcp->fc_lun);
|
|
ret = transport_get_lun_for_cmd(&cmd->se_cmd, NULL, cmd->lun);
|
|
if (ret < 0) {
|
|
ft_dump_cmd(cmd, __func__);
|
|
transport_send_check_condition_and_sense(&cmd->se_cmd,
|
|
cmd->se_cmd.scsi_sense_reason, 0);
|
|
return;
|
|
}
|
|
|
|
ret = transport_generic_allocate_tasks(se_cmd, cmd->cdb);
|
|
|
|
FT_IO_DBG("r_ctl %x alloc task ret %d\n", fh->fh_r_ctl, ret);
|
|
ft_dump_cmd(cmd, __func__);
|
|
|
|
if (ret == -1) {
|
|
transport_send_check_condition_and_sense(se_cmd,
|
|
TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
|
|
transport_generic_free_cmd(se_cmd, 0, 1, 0);
|
|
return;
|
|
}
|
|
if (ret == -2) {
|
|
if (se_cmd->se_cmd_flags & SCF_SCSI_RESERVATION_CONFLICT)
|
|
ft_queue_status(se_cmd);
|
|
else
|
|
transport_send_check_condition_and_sense(se_cmd,
|
|
se_cmd->scsi_sense_reason, 0);
|
|
transport_generic_free_cmd(se_cmd, 0, 1, 0);
|
|
return;
|
|
}
|
|
transport_generic_handle_cdb(se_cmd);
|
|
return;
|
|
|
|
err:
|
|
ft_send_resp_code(cmd, FCP_CMND_FIELDS_INVALID);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Handle request in the command thread.
|
|
*/
|
|
static void ft_exec_req(struct ft_cmd *cmd)
|
|
{
|
|
FT_IO_DBG("cmd state %x\n", cmd->state);
|
|
switch (cmd->state) {
|
|
case FC_CMD_ST_NEW:
|
|
ft_send_cmd(cmd);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Processing thread.
|
|
* Currently one thread per tpg.
|
|
*/
|
|
int ft_thread(void *arg)
|
|
{
|
|
struct ft_tpg *tpg = arg;
|
|
struct se_queue_obj *qobj = &tpg->qobj;
|
|
struct ft_cmd *cmd;
|
|
int ret;
|
|
|
|
set_user_nice(current, -20);
|
|
|
|
while (!kthread_should_stop()) {
|
|
ret = wait_event_interruptible(qobj->thread_wq,
|
|
atomic_read(&qobj->queue_cnt) || kthread_should_stop());
|
|
if (ret < 0 || kthread_should_stop())
|
|
goto out;
|
|
cmd = ft_dequeue_cmd(qobj);
|
|
if (cmd)
|
|
ft_exec_req(cmd);
|
|
}
|
|
|
|
out:
|
|
return 0;
|
|
}
|