[deliverable/linux.git] / drivers / target / tcm_fc / tfc_cmd.c

/*
 * Copyright (c) 2010 Cisco Systems, Inc.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 */

/* XXX TBD some includes may be extraneous */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <generated/utsrelease.h>
#include <linux/utsname.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/kthread.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/configfs.h>
#include <linux/ctype.h>
#include <linux/hash.h>
#include <asm/unaligned.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_tcq.h>
#include <scsi/libfc.h>
#include <scsi/fc_encode.h>

#include <target/target_core_base.h>
#include <target/target_core_transport.h>
#include <target/target_core_fabric_ops.h>
#include <target/target_core_device.h>
#include <target/target_core_tpg.h>
#include <target/target_core_configfs.h>
#include <target/target_core_tmr.h>
#include <target/configfs_macros.h>

#include "tcm_fc.h"

/*
 * Dump cmd state for debugging.
 */
void ft_dump_cmd(struct ft_cmd *cmd, const char *caller)
{
	struct fc_exch *ep;
	struct fc_seq *sp;
	struct se_cmd *se_cmd;
	struct scatterlist *sg;
	int count;

	se_cmd = &cmd->se_cmd;
	pr_debug("%s: cmd %p sess %p seq %p se_cmd %p\n",
		caller, cmd, cmd->sess, cmd->seq, se_cmd);
	pr_debug("%s: cmd %p cdb %p\n",
		caller, cmd, cmd->cdb);
	pr_debug("%s: cmd %p lun %d\n", caller, cmd, cmd->lun);

	pr_debug("%s: cmd %p data_nents %u len %u se_cmd_flags <0x%x>\n",
		caller, cmd, se_cmd->t_data_nents,
	       se_cmd->data_length, se_cmd->se_cmd_flags);

	for_each_sg(se_cmd->t_data_sg, sg, se_cmd->t_data_nents, count)
		pr_debug("%s: cmd %p sg %p page %p "
			"len 0x%x off 0x%x\n",
			caller, cmd, sg,
			sg_page(sg), sg->length, sg->offset);

	sp = cmd->seq;
	if (sp) {
		ep = fc_seq_exch(sp);
		pr_debug("%s: cmd %p sid %x did %x "
			"ox_id %x rx_id %x seq_id %x e_stat %x\n",
			caller, cmd, ep->sid, ep->did, ep->oxid, ep->rxid,
			sp->id, ep->esb_stat);
	}
	print_hex_dump(KERN_INFO, "ft_dump_cmd ", DUMP_PREFIX_NONE,
		16, 4, cmd->cdb, MAX_COMMAND_SIZE, 0);
}

static void ft_free_cmd(struct ft_cmd *cmd)
{
	struct fc_frame *fp;
	struct fc_lport *lport;

	if (!cmd)
		return;
	fp = cmd->req_frame;
	lport = fr_dev(fp);
	if (fr_seq(fp))
		lport->tt.seq_release(fr_seq(fp));
	fc_frame_free(fp);
	ft_sess_put(cmd->sess);	/* undo get from lookup at recv */
	kfree(cmd);
}

void ft_release_cmd(struct se_cmd *se_cmd)
{
	struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);

	ft_free_cmd(cmd);
}

void ft_check_stop_free(struct se_cmd *se_cmd)
{
	transport_generic_free_cmd(se_cmd, 0);
}

/*
 * Send response.
 */
int ft_queue_status(struct se_cmd *se_cmd)
{
	struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
	struct fc_frame *fp;
	struct fcp_resp_with_ext *fcp;
	struct fc_lport *lport;
	struct fc_exch *ep;
	size_t len;

	ft_dump_cmd(cmd, __func__);
	ep = fc_seq_exch(cmd->seq);
	lport = ep->lp;
	len = sizeof(*fcp) + se_cmd->scsi_sense_length;
	fp = fc_frame_alloc(lport, len);
	if (!fp) {
		/* XXX shouldn't just drop it - requeue and retry? */
		return 0;
	}
	fcp = fc_frame_payload_get(fp, len);
	memset(fcp, 0, len);
	fcp->resp.fr_status = se_cmd->scsi_status;

	len = se_cmd->scsi_sense_length;
	if (len) {
		fcp->resp.fr_flags |= FCP_SNS_LEN_VAL;
		fcp->ext.fr_sns_len = htonl(len);
		memcpy((fcp + 1), se_cmd->sense_buffer, len);
	}

	/*
	 * Test underflow and overflow with one mask.  Usually both are off.
	 * Bidirectional commands are not handled yet.
	 */
	if (se_cmd->se_cmd_flags & (SCF_OVERFLOW_BIT | SCF_UNDERFLOW_BIT)) {
		if (se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT)
			fcp->resp.fr_flags |= FCP_RESID_OVER;
		else
			fcp->resp.fr_flags |= FCP_RESID_UNDER;
		fcp->ext.fr_resid = cpu_to_be32(se_cmd->residual_count);
	}

	/*
	 * Send response.
	 */
	cmd->seq = lport->tt.seq_start_next(cmd->seq);
	fc_fill_fc_hdr(fp, FC_RCTL_DD_CMD_STATUS, ep->did, ep->sid, FC_TYPE_FCP,
		       FC_FC_EX_CTX | FC_FC_LAST_SEQ | FC_FC_END_SEQ, 0);

	lport->tt.seq_send(lport, cmd->seq, fp);
	lport->tt.exch_done(cmd->seq);
	return 0;
}

int ft_write_pending_status(struct se_cmd *se_cmd)
{
	struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);

	return cmd->write_data_len != se_cmd->data_length;
}

/*
 * Send TX_RDY (transfer ready).
 */
int ft_write_pending(struct se_cmd *se_cmd)
{
	struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
	struct fc_frame *fp;
	struct fcp_txrdy *txrdy;
	struct fc_lport *lport;
	struct fc_exch *ep;
	struct fc_frame_header *fh;
	u32 f_ctl;

	ft_dump_cmd(cmd, __func__);

	ep = fc_seq_exch(cmd->seq);
	lport = ep->lp;
	fp = fc_frame_alloc(lport, sizeof(*txrdy));
	if (!fp)
		return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;

	txrdy = fc_frame_payload_get(fp, sizeof(*txrdy));
	memset(txrdy, 0, sizeof(*txrdy));
	txrdy->ft_burst_len = htonl(se_cmd->data_length);

	cmd->seq = lport->tt.seq_start_next(cmd->seq);
	fc_fill_fc_hdr(fp, FC_RCTL_DD_DATA_DESC, ep->did, ep->sid, FC_TYPE_FCP,
		       FC_FC_EX_CTX | FC_FC_END_SEQ | FC_FC_SEQ_INIT, 0);

	fh = fc_frame_header_get(fp);
	f_ctl = ntoh24(fh->fh_f_ctl);

	/* Only if it is 'Exchange Responder' */
	if (f_ctl & FC_FC_EX_CTX) {
		/* Target is 'exchange responder' and sending XFER_READY
		 * to 'exchange initiator (initiator)'
		 */
		if ((ep->xid <= lport->lro_xid) &&
		    (fh->fh_r_ctl == FC_RCTL_DD_DATA_DESC)) {
			if (se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
				/*
				 * cmd may have been broken up into multiple
				 * tasks. Link their sgs together so we can
				 * operate on them all at once.
				 */
				transport_do_task_sg_chain(se_cmd);
				cmd->sg = se_cmd->t_tasks_sg_chained;
				cmd->sg_cnt =
					se_cmd->t_tasks_sg_chained_no;
			}
			if (cmd->sg && lport->tt.ddp_target(lport, ep->xid,
							    cmd->sg,
							    cmd->sg_cnt))
				cmd->was_ddp_setup = 1;
		}
	}
	lport->tt.seq_send(lport, cmd->seq, fp);
	return 0;
}

u32 ft_get_task_tag(struct se_cmd *se_cmd)
{
	struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);

	return fc_seq_exch(cmd->seq)->rxid;
}

int ft_get_cmd_state(struct se_cmd *se_cmd)
{
	return 0;
}

int ft_is_state_remove(struct se_cmd *se_cmd)
{
	return 0;	/* XXX TBD */
}

/*
 * FC sequence response handler for follow-on sequences (data) and aborts.
 */
static void ft_recv_seq(struct fc_seq *sp, struct fc_frame *fp, void *arg)
{
	struct ft_cmd *cmd = arg;
	struct fc_frame_header *fh;

	if (IS_ERR(fp)) {
		/* XXX need to find cmd if queued */
		cmd->seq = NULL;
		transport_generic_free_cmd(&cmd->se_cmd, 0);
		return;
	}

	fh = fc_frame_header_get(fp);

	switch (fh->fh_r_ctl) {
	case FC_RCTL_DD_SOL_DATA:	/* write data */
		ft_recv_write_data(cmd, fp);
		break;
	case FC_RCTL_DD_UNSOL_CTL:	/* command */
	case FC_RCTL_DD_SOL_CTL:	/* transfer ready */
	case FC_RCTL_DD_DATA_DESC:	/* transfer ready */
	default:
		pr_debug("%s: unhandled frame r_ctl %x\n",
		       __func__, fh->fh_r_ctl);
		ft_invl_hw_context(cmd);
		fc_frame_free(fp);
		transport_generic_free_cmd(&cmd->se_cmd, 0);
		break;
	}
}

/*
 * Send a FCP response including SCSI status and optional FCP rsp_code.
 * status is SAM_STAT_GOOD (zero) iff code is valid.
 * This is used in error cases, such as allocation failures.
 */
static void ft_send_resp_status(struct fc_lport *lport,
				const struct fc_frame *rx_fp,
				u32 status, enum fcp_resp_rsp_codes code)
{
	struct fc_frame *fp;
	struct fc_seq *sp;
	const struct fc_frame_header *fh;
	size_t len;
	struct fcp_resp_with_ext *fcp;
	struct fcp_resp_rsp_info *info;

	fh = fc_frame_header_get(rx_fp);
	pr_debug("FCP error response: did %x oxid %x status %x code %x\n",
		  ntoh24(fh->fh_s_id), ntohs(fh->fh_ox_id), status, code);
	len = sizeof(*fcp);
	if (status == SAM_STAT_GOOD)
		len += sizeof(*info);
	fp = fc_frame_alloc(lport, len);
	if (!fp)
		return;
	fcp = fc_frame_payload_get(fp, len);
	memset(fcp, 0, len);
	fcp->resp.fr_status = status;
	if (status == SAM_STAT_GOOD) {
		fcp->ext.fr_rsp_len = htonl(sizeof(*info));
		fcp->resp.fr_flags |= FCP_RSP_LEN_VAL;
		info = (struct fcp_resp_rsp_info *)(fcp + 1);
		info->rsp_code = code;
	}

	fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_DD_CMD_STATUS, 0);
	sp = fr_seq(fp);
	if (sp)
		lport->tt.seq_send(lport, sp, fp);
	else
		lport->tt.frame_send(lport, fp);
}

/*
 * Send error or task management response.
 */
static void ft_send_resp_code(struct ft_cmd *cmd,
			      enum fcp_resp_rsp_codes code)
{
	ft_send_resp_status(cmd->sess->tport->lport,
			    cmd->req_frame, SAM_STAT_GOOD, code);
}


/*
 * Send error or task management response.
 * Always frees the cmd and associated state.
 */
static void ft_send_resp_code_and_free(struct ft_cmd *cmd,
				      enum fcp_resp_rsp_codes code)
{
	ft_send_resp_code(cmd, code);
	ft_free_cmd(cmd);
}

/*
 * Handle Task Management Request.
 */
static void ft_send_tm(struct ft_cmd *cmd)
{
	struct se_tmr_req *tmr;
	struct fcp_cmnd *fcp;
	struct ft_sess *sess;
	u8 tm_func;

	fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp));

	switch (fcp->fc_tm_flags) {
	case FCP_TMF_LUN_RESET:
		tm_func = TMR_LUN_RESET;
		break;
	case FCP_TMF_TGT_RESET:
		tm_func = TMR_TARGET_WARM_RESET;
		break;
	case FCP_TMF_CLR_TASK_SET:
		tm_func = TMR_CLEAR_TASK_SET;
		break;
	case FCP_TMF_ABT_TASK_SET:
		tm_func = TMR_ABORT_TASK_SET;
		break;
	case FCP_TMF_CLR_ACA:
		tm_func = TMR_CLEAR_ACA;
		break;
	default:
		/*
		 * FCP4r01 indicates having a combination of
		 * tm_flags set is invalid.
		 */
		pr_debug("invalid FCP tm_flags %x\n", fcp->fc_tm_flags);
		ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID);
		return;
	}

	pr_debug("alloc tm cmd fn %d\n", tm_func);
	tmr = core_tmr_alloc_req(&cmd->se_cmd, cmd, tm_func, GFP_KERNEL);
	if (!tmr) {
		pr_debug("alloc failed\n");
		ft_send_resp_code_and_free(cmd, FCP_TMF_FAILED);
		return;
	}
	cmd->se_cmd.se_tmr_req = tmr;

	switch (fcp->fc_tm_flags) {
	case FCP_TMF_LUN_RESET:
		cmd->lun = scsilun_to_int((struct scsi_lun *)fcp->fc_lun);
		if (transport_lookup_tmr_lun(&cmd->se_cmd, cmd->lun) < 0) {
			/*
			 * Make sure to clean up newly allocated TMR request
			 * since "unable to  handle TMR request because failed
			 * to get to LUN"
			 */
			pr_debug("Failed to get LUN for TMR func %d, "
				  "se_cmd %p, unpacked_lun %d\n",
				  tm_func, &cmd->se_cmd, cmd->lun);
			ft_dump_cmd(cmd, __func__);
			sess = cmd->sess;
			transport_send_check_condition_and_sense(&cmd->se_cmd,
				cmd->se_cmd.scsi_sense_reason, 0);
			transport_generic_free_cmd(&cmd->se_cmd, 0);
			ft_sess_put(sess);
			return;
		}
		break;
	case FCP_TMF_TGT_RESET:
	case FCP_TMF_CLR_TASK_SET:
	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;
	}
	pr_debug("tmr fn %d resp %d fcp code %d\n",
		  tmr->function, tmr->response, code);
	ft_send_resp_code(cmd, code);
	return 0;
}

static void ft_send_work(struct work_struct *work);

/*
 * 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 */

	INIT_WORK(&cmd->work, ft_send_work);
	queue_work(sess->tport->tpg->workqueue, &cmd->work);
	return;

busy:
	pr_debug("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:
		pr_debug("%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_work(struct work_struct *work)
{
	struct ft_cmd *cmd = container_of(work, struct ft_cmd, work);
	struct fc_frame_header *fh = fc_frame_header_get(cmd->req_frame);
	struct se_cmd *se_cmd;
	struct fcp_cmnd *fcp;
	int data_dir = 0;
	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_lookup_cmd_lun(&cmd->se_cmd, 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);

	pr_debug("r_ctl %x alloc task ret %d\n", fh->fh_r_ctl, ret);
	ft_dump_cmd(cmd, __func__);

	if (ret == -ENOMEM) {
		transport_send_check_condition_and_sense(se_cmd,
				TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
		transport_generic_free_cmd(se_cmd, 0);
		return;
	}
	if (ret == -EINVAL) {
		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);
		return;
	}
	transport_handle_cdb_direct(se_cmd);
	return;

err:
	ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID);
}
Commit	Line	Data
3699d92a KP	1	/*
	2	* Copyright (c) 2010 Cisco Systems, Inc.
	3	*
	4	* This program is free software; you can redistribute it and/or modify it
	5	* under the terms and conditions of the GNU General Public License,
	6	* version 2, as published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope it will be useful, but WITHOUT
	9	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	10	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	11	* more details.
	12	*
	13	* You should have received a copy of the GNU General Public License along with
	14	* this program; if not, write to the Free Software Foundation, Inc.,
	15	* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
	16	*/
	17
	18	/* XXX TBD some includes may be extraneous */
	19
	20	#include <linux/module.h>
	21	#include <linux/moduleparam.h>
3699d92a KP	22	#include <generated/utsrelease.h>
	23	#include <linux/utsname.h>
	24	#include <linux/init.h>
	25	#include <linux/slab.h>
	26	#include <linux/kthread.h>
	27	#include <linux/types.h>
	28	#include <linux/string.h>
	29	#include <linux/configfs.h>
	30	#include <linux/ctype.h>
	31	#include <linux/hash.h>
	32	#include <asm/unaligned.h>
	33	#include <scsi/scsi.h>
	34	#include <scsi/scsi_host.h>
	35	#include <scsi/scsi_device.h>
	36	#include <scsi/scsi_cmnd.h>
61db1802	37	#include <scsi/scsi_tcq.h>
3699d92a KP	38	#include <scsi/libfc.h>
	39	#include <scsi/fc_encode.h>
	40
	41	#include <target/target_core_base.h>
	42	#include <target/target_core_transport.h>
	43	#include <target/target_core_fabric_ops.h>
	44	#include <target/target_core_device.h>
	45	#include <target/target_core_tpg.h>
	46	#include <target/target_core_configfs.h>
3699d92a KP	47	#include <target/target_core_tmr.h>
	48	#include <target/configfs_macros.h>
	49
	50	#include "tcm_fc.h"
	51
	52	/*
	53	* Dump cmd state for debugging.
	54	*/
	55	void ft_dump_cmd(struct ft_cmd cmd, const char caller)
	56	{
	57	struct fc_exch *ep;
	58	struct fc_seq *sp;
	59	struct se_cmd *se_cmd;
ec98f782 AG	60	struct scatterlist *sg;
ec98f782 AG	61	int count;
3699d92a	62
3699d92a	63	se_cmd = &cmd->se_cmd;
58fc73d1 CH	64	pr_debug("%s: cmd %p sess %p seq %p se_cmd %p\n",
58fc73d1 CH	65	caller, cmd, cmd->sess, cmd->seq, se_cmd);
6708bb27	66	pr_debug("%s: cmd %p cdb %p\n",
3699d92a	67	caller, cmd, cmd->cdb);
6708bb27	68	pr_debug("%s: cmd %p lun %d\n", caller, cmd, cmd->lun);
3699d92a	69
6708bb27	70	pr_debug("%s: cmd %p data_nents %u len %u se_cmd_flags <0x%x>\n",
ec98f782	71	caller, cmd, se_cmd->t_data_nents,
05d1c7c0	72	se_cmd->data_length, se_cmd->se_cmd_flags);
5951146d	73
ec98f782	74	for_each_sg(se_cmd->t_data_sg, sg, se_cmd->t_data_nents, count)
6708bb27	75	pr_debug("%s: cmd %p sg %p page %p "
ec98f782 AG	76	"len 0x%x off 0x%x\n",
	77	caller, cmd, sg,
	78	sg_page(sg), sg->length, sg->offset);
	79
3699d92a KP	80	sp = cmd->seq;
	81	if (sp) {
	82	ep = fc_seq_exch(sp);
6708bb27	83	pr_debug("%s: cmd %p sid %x did %x "
3699d92a KP	84	"ox_id %x rx_id %x seq_id %x e_stat %x\n",
	85	caller, cmd, ep->sid, ep->did, ep->oxid, ep->rxid,
	86	sp->id, ep->esb_stat);
	87	}
	88	print_hex_dump(KERN_INFO, "ft_dump_cmd ", DUMP_PREFIX_NONE,
	89	16, 4, cmd->cdb, MAX_COMMAND_SIZE, 0);
	90	}
	91
3699d92a KP	92	static void ft_free_cmd(struct ft_cmd *cmd)
	93	{
	94	struct fc_frame *fp;
	95	struct fc_lport *lport;
	96
	97	if (!cmd)
	98	return;
	99	fp = cmd->req_frame;
	100	lport = fr_dev(fp);
	101	if (fr_seq(fp))
	102	lport->tt.seq_release(fr_seq(fp));
	103	fc_frame_free(fp);
	104	ft_sess_put(cmd->sess); /* undo get from lookup at recv */
	105	kfree(cmd);
	106	}
	107
	108	void ft_release_cmd(struct se_cmd *se_cmd)
	109	{
	110	struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
	111
	112	ft_free_cmd(cmd);
	113	}
	114
	115	void ft_check_stop_free(struct se_cmd *se_cmd)
	116	{
82f1c8a4	117	transport_generic_free_cmd(se_cmd, 0);
3699d92a KP	118	}
	119
	120	/*
	121	* Send response.
	122	*/
	123	int ft_queue_status(struct se_cmd *se_cmd)
	124	{
	125	struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
	126	struct fc_frame *fp;
	127	struct fcp_resp_with_ext *fcp;
	128	struct fc_lport *lport;
	129	struct fc_exch *ep;
	130	size_t len;
	131
	132	ft_dump_cmd(cmd, __func__);
	133	ep = fc_seq_exch(cmd->seq);
	134	lport = ep->lp;
	135	len = sizeof(*fcp) + se_cmd->scsi_sense_length;
	136	fp = fc_frame_alloc(lport, len);
	137	if (!fp) {
	138	/* XXX shouldn't just drop it - requeue and retry? */
	139	return 0;
	140	}
	141	fcp = fc_frame_payload_get(fp, len);
	142	memset(fcp, 0, len);
	143	fcp->resp.fr_status = se_cmd->scsi_status;
	144
	145	len = se_cmd->scsi_sense_length;
	146	if (len) {
	147	fcp->resp.fr_flags \|= FCP_SNS_LEN_VAL;
	148	fcp->ext.fr_sns_len = htonl(len);
	149	memcpy((fcp + 1), se_cmd->sense_buffer, len);
	150	}
	151
	152	/*
	153	* Test underflow and overflow with one mask. Usually both are off.
	154	* Bidirectional commands are not handled yet.
	155	*/
	156	if (se_cmd->se_cmd_flags & (SCF_OVERFLOW_BIT \| SCF_UNDERFLOW_BIT)) {
	157	if (se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT)
	158	fcp->resp.fr_flags \|= FCP_RESID_OVER;
	159	else
	160	fcp->resp.fr_flags \|= FCP_RESID_UNDER;
	161	fcp->ext.fr_resid = cpu_to_be32(se_cmd->residual_count);
	162	}
	163
	164	/*
	165	* Send response.
	166	*/
	167	cmd->seq = lport->tt.seq_start_next(cmd->seq);
	168	fc_fill_fc_hdr(fp, FC_RCTL_DD_CMD_STATUS, ep->did, ep->sid, FC_TYPE_FCP,
	169	FC_FC_EX_CTX \| FC_FC_LAST_SEQ \| FC_FC_END_SEQ, 0);
	170
	171	lport->tt.seq_send(lport, cmd->seq, fp);
	172	lport->tt.exch_done(cmd->seq);
	173	return 0;
	174	}
	175
	176	int ft_write_pending_status(struct se_cmd *se_cmd)
	177	{
	178	struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
	179
	180	return cmd->write_data_len != se_cmd->data_length;
	181	}
182
183	/*
184	* Send TX_RDY (transfer ready).
185	*/
186	int ft_write_pending(struct se_cmd *se_cmd)
187	{
188	struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
189	struct fc_frame *fp;
190	struct fcp_txrdy *txrdy;
191	struct fc_lport *lport;
192	struct fc_exch *ep;
193	struct fc_frame_header *fh;
194	u32 f_ctl;
195
196	ft_dump_cmd(cmd, __func__);
197
198	ep = fc_seq_exch(cmd->seq);
199	lport = ep->lp;
200	fp = fc_frame_alloc(lport, sizeof(*txrdy));
201	if (!fp)
202	return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES;
203
204	txrdy = fc_frame_payload_get(fp, sizeof(*txrdy));
205	memset(txrdy, 0, sizeof(*txrdy));
206	txrdy->ft_burst_len = htonl(se_cmd->data_length);
207
208	cmd->seq = lport->tt.seq_start_next(cmd->seq);
209	fc_fill_fc_hdr(fp, FC_RCTL_DD_DATA_DESC, ep->did, ep->sid, FC_TYPE_FCP,
210	FC_FC_EX_CTX \| FC_FC_END_SEQ \| FC_FC_SEQ_INIT, 0);
211
212	fh = fc_frame_header_get(fp);
213	f_ctl = ntoh24(fh->fh_f_ctl);
214
215	/* Only if it is 'Exchange Responder' */
216	if (f_ctl & FC_FC_EX_CTX) {
217	/* Target is 'exchange responder' and sending XFER_READY
218	* to 'exchange initiator (initiator)'
219	*/
220	if ((ep->xid <= lport->lro_xid) &&
221	(fh->fh_r_ctl == FC_RCTL_DD_DATA_DESC)) {
222	if (se_cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) {
223	/*
ec98f782 AG	224	* cmd may have been broken up into multiple
	225	* tasks. Link their sgs together so we can
	226	* operate on them all at once.
3699d92a KP	227	*/
3699d92a KP	228	transport_do_task_sg_chain(se_cmd);
a1d8b49a	229	cmd->sg = se_cmd->t_tasks_sg_chained;
3699d92a	230	cmd->sg_cnt =
a1d8b49a	231	se_cmd->t_tasks_sg_chained_no;
3699d92a	232	}
33dc362b YZ	233	if (cmd->sg && lport->tt.ddp_target(lport, ep->xid,
	234	cmd->sg,
	235	cmd->sg_cnt))
3699d92a KP	236	cmd->was_ddp_setup = 1;
	237	}
	238	}
	239	lport->tt.seq_send(lport, cmd->seq, fp);
	240	return 0;
	241	}
	242
	243	u32 ft_get_task_tag(struct se_cmd *se_cmd)
	244	{
	245	struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
	246
	247	return fc_seq_exch(cmd->seq)->rxid;
	248	}
	249
	250	int ft_get_cmd_state(struct se_cmd *se_cmd)
	251	{
58fc73d1	252	return 0;
3699d92a KP	253	}
	254
	255	int ft_is_state_remove(struct se_cmd *se_cmd)
	256	{
	257	return 0; /* XXX TBD */
	258	}
	259
3699d92a KP	260	/*
	261	* FC sequence response handler for follow-on sequences (data) and aborts.
	262	*/
	263	static void ft_recv_seq(struct fc_seq sp, struct fc_frame fp, void *arg)
	264	{
	265	struct ft_cmd *cmd = arg;
	266	struct fc_frame_header *fh;
	267
	268	if (IS_ERR(fp)) {
	269	/* XXX need to find cmd if queued */
3699d92a	270	cmd->seq = NULL;
82f1c8a4	271	transport_generic_free_cmd(&cmd->se_cmd, 0);
3699d92a KP	272	return;
	273	}
	274
	275	fh = fc_frame_header_get(fp);
	276
	277	switch (fh->fh_r_ctl) {
	278	case FC_RCTL_DD_SOL_DATA: /* write data */
	279	ft_recv_write_data(cmd, fp);
	280	break;
	281	case FC_RCTL_DD_UNSOL_CTL: /* command */
	282	case FC_RCTL_DD_SOL_CTL: /* transfer ready */
	283	case FC_RCTL_DD_DATA_DESC: /* transfer ready */
	284	default:
6708bb27	285	pr_debug("%s: unhandled frame r_ctl %x\n",
3699d92a	286	__func__, fh->fh_r_ctl);
dcd998cc	287	ft_invl_hw_context(cmd);
3699d92a	288	fc_frame_free(fp);
82f1c8a4	289	transport_generic_free_cmd(&cmd->se_cmd, 0);
3699d92a KP	290	break;
	291	}
	292	}
	293
	294	/*
	295	* Send a FCP response including SCSI status and optional FCP rsp_code.
	296	* status is SAM_STAT_GOOD (zero) iff code is valid.
	297	* This is used in error cases, such as allocation failures.
	298	*/
	299	static void ft_send_resp_status(struct fc_lport *lport,
	300	const struct fc_frame *rx_fp,
	301	u32 status, enum fcp_resp_rsp_codes code)
	302	{
	303	struct fc_frame *fp;
	304	struct fc_seq *sp;
	305	const struct fc_frame_header *fh;
	306	size_t len;
	307	struct fcp_resp_with_ext *fcp;
	308	struct fcp_resp_rsp_info *info;
	309
	310	fh = fc_frame_header_get(rx_fp);
6708bb27	311	pr_debug("FCP error response: did %x oxid %x status %x code %x\n",
3699d92a KP	312	ntoh24(fh->fh_s_id), ntohs(fh->fh_ox_id), status, code);
	313	len = sizeof(*fcp);
	314	if (status == SAM_STAT_GOOD)
	315	len += sizeof(*info);
	316	fp = fc_frame_alloc(lport, len);
	317	if (!fp)
	318	return;
	319	fcp = fc_frame_payload_get(fp, len);
	320	memset(fcp, 0, len);
	321	fcp->resp.fr_status = status;
	322	if (status == SAM_STAT_GOOD) {
	323	fcp->ext.fr_rsp_len = htonl(sizeof(*info));
	324	fcp->resp.fr_flags \|= FCP_RSP_LEN_VAL;
	325	info = (struct fcp_resp_rsp_info *)(fcp + 1);
	326	info->rsp_code = code;
	327	}
	328
	329	fc_fill_reply_hdr(fp, rx_fp, FC_RCTL_DD_CMD_STATUS, 0);
	330	sp = fr_seq(fp);
	331	if (sp)
	332	lport->tt.seq_send(lport, sp, fp);
	333	else
	334	lport->tt.frame_send(lport, fp);
	335	}
	336
	337	/*
	338	* Send error or task management response.
3699d92a	339	*/
f2f7b09c KP	340	static void ft_send_resp_code(struct ft_cmd *cmd,
f2f7b09c KP	341	enum fcp_resp_rsp_codes code)
3699d92a KP	342	{
	343	ft_send_resp_status(cmd->sess->tport->lport,
	344	cmd->req_frame, SAM_STAT_GOOD, code);
f2f7b09c KP	345	}
	346
	347
	348	/*
	349	* Send error or task management response.
	350	* Always frees the cmd and associated state.
	351	*/
	352	static void ft_send_resp_code_and_free(struct ft_cmd *cmd,
	353	enum fcp_resp_rsp_codes code)
	354	{
	355	ft_send_resp_code(cmd, code);
3699d92a KP	356	ft_free_cmd(cmd);
	357	}
	358
	359	/*
	360	* Handle Task Management Request.
	361	*/
	362	static void ft_send_tm(struct ft_cmd *cmd)
	363	{
	364	struct se_tmr_req *tmr;
	365	struct fcp_cmnd *fcp;
61db9527	366	struct ft_sess *sess;
3699d92a KP	367	u8 tm_func;
	368
	369	fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp));
	370
	371	switch (fcp->fc_tm_flags) {
	372	case FCP_TMF_LUN_RESET:
	373	tm_func = TMR_LUN_RESET;
3699d92a KP	374	break;
	375	case FCP_TMF_TGT_RESET:
	376	tm_func = TMR_TARGET_WARM_RESET;
	377	break;
	378	case FCP_TMF_CLR_TASK_SET:
	379	tm_func = TMR_CLEAR_TASK_SET;
	380	break;
	381	case FCP_TMF_ABT_TASK_SET:
	382	tm_func = TMR_ABORT_TASK_SET;
	383	break;
	384	case FCP_TMF_CLR_ACA:
	385	tm_func = TMR_CLEAR_ACA;
	386	break;
	387	default:
	388	/*
	389	* FCP4r01 indicates having a combination of
	390	* tm_flags set is invalid.
	391	*/
6708bb27	392	pr_debug("invalid FCP tm_flags %x\n", fcp->fc_tm_flags);
f2f7b09c	393	ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID);
3699d92a KP	394	return;
	395	}
	396
6708bb27	397	pr_debug("alloc tm cmd fn %d\n", tm_func);
dd503a5f	398	tmr = core_tmr_alloc_req(&cmd->se_cmd, cmd, tm_func, GFP_KERNEL);
3699d92a	399	if (!tmr) {
6708bb27	400	pr_debug("alloc failed\n");
f2f7b09c	401	ft_send_resp_code_and_free(cmd, FCP_TMF_FAILED);
3699d92a KP	402	return;
	403	}
	404	cmd->se_cmd.se_tmr_req = tmr;
61db9527 KP	405
	406	switch (fcp->fc_tm_flags) {
	407	case FCP_TMF_LUN_RESET:
	408	cmd->lun = scsilun_to_int((struct scsi_lun *)fcp->fc_lun);
5951146d	409	if (transport_lookup_tmr_lun(&cmd->se_cmd, cmd->lun) < 0) {
61db9527 KP	410	/*
	411	* Make sure to clean up newly allocated TMR request
	412	* since "unable to handle TMR request because failed
	413	* to get to LUN"
	414	*/
6708bb27	415	pr_debug("Failed to get LUN for TMR func %d, "
61db9527 KP	416	"se_cmd %p, unpacked_lun %d\n",
	417	tm_func, &cmd->se_cmd, cmd->lun);
	418	ft_dump_cmd(cmd, __func__);
	419	sess = cmd->sess;
	420	transport_send_check_condition_and_sense(&cmd->se_cmd,
	421	cmd->se_cmd.scsi_sense_reason, 0);
82f1c8a4	422	transport_generic_free_cmd(&cmd->se_cmd, 0);
61db9527 KP	423	ft_sess_put(sess);
	424	return;
	425	}
	426	break;
	427	case FCP_TMF_TGT_RESET:
	428	case FCP_TMF_CLR_TASK_SET:
	429	case FCP_TMF_ABT_TASK_SET:
	430	case FCP_TMF_CLR_ACA:
	431	break;
	432	default:
	433	return;
	434	}
3699d92a KP	435	transport_generic_handle_tmr(&cmd->se_cmd);
	436	}
	437
	438	/*
	439	* Send status from completed task management request.
	440	*/
	441	int ft_queue_tm_resp(struct se_cmd *se_cmd)
	442	{
	443	struct ft_cmd *cmd = container_of(se_cmd, struct ft_cmd, se_cmd);
	444	struct se_tmr_req *tmr = se_cmd->se_tmr_req;
	445	enum fcp_resp_rsp_codes code;
	446
	447	switch (tmr->response) {
	448	case TMR_FUNCTION_COMPLETE:
	449	code = FCP_TMF_CMPL;
	450	break;
	451	case TMR_LUN_DOES_NOT_EXIST:
	452	code = FCP_TMF_INVALID_LUN;
	453	break;
	454	case TMR_FUNCTION_REJECTED:
	455	code = FCP_TMF_REJECTED;
	456	break;
	457	case TMR_TASK_DOES_NOT_EXIST:
	458	case TMR_TASK_STILL_ALLEGIANT:
	459	case TMR_TASK_FAILOVER_NOT_SUPPORTED:
	460	case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
	461	case TMR_FUNCTION_AUTHORIZATION_FAILED:
	462	default:
	463	code = FCP_TMF_FAILED;
	464	break;
	465	}
6708bb27	466	pr_debug("tmr fn %d resp %d fcp code %d\n",
3699d92a KP	467	tmr->function, tmr->response, code);
	468	ft_send_resp_code(cmd, code);
	469	return 0;
	470	}
	471
58fc73d1 CH	472	static void ft_send_work(struct work_struct *work);
58fc73d1 CH	473
3699d92a KP	474	/*
	475	* Handle incoming FCP command.
	476	*/
	477	static void ft_recv_cmd(struct ft_sess sess, struct fc_frame fp)
	478	{
	479	struct ft_cmd *cmd;
	480	struct fc_lport *lport = sess->tport->lport;
	481
	482	cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
	483	if (!cmd)
	484	goto busy;
	485	cmd->sess = sess;
	486	cmd->seq = lport->tt.seq_assign(lport, fp);
	487	if (!cmd->seq) {
	488	kfree(cmd);
	489	goto busy;
	490	}
	491	cmd->req_frame = fp; /* hold frame during cmd */
58fc73d1 CH	492
	493	INIT_WORK(&cmd->work, ft_send_work);
	494	queue_work(sess->tport->tpg->workqueue, &cmd->work);
3699d92a KP	495	return;
	496
	497	busy:
6708bb27	498	pr_debug("cmd or seq allocation failure - sending BUSY\n");
3699d92a KP	499	ft_send_resp_status(lport, fp, SAM_STAT_BUSY, 0);
	500	fc_frame_free(fp);
	501	ft_sess_put(sess); /* undo get from lookup */
	502	}
	503
	504
	505	/*
	506	* Handle incoming FCP frame.
	507	* Caller has verified that the frame is type FCP.
	508	*/
	509	void ft_recv_req(struct ft_sess sess, struct fc_frame fp)
	510	{
	511	struct fc_frame_header *fh = fc_frame_header_get(fp);
	512
	513	switch (fh->fh_r_ctl) {
	514	case FC_RCTL_DD_UNSOL_CMD: /* command */
	515	ft_recv_cmd(sess, fp);
	516	break;
	517	case FC_RCTL_DD_SOL_DATA: /* write data */
	518	case FC_RCTL_DD_UNSOL_CTL:
	519	case FC_RCTL_DD_SOL_CTL:
	520	case FC_RCTL_DD_DATA_DESC: /* transfer ready */
	521	case FC_RCTL_ELS4_REQ: /* SRR, perhaps */
	522	default:
6708bb27	523	pr_debug("%s: unhandled frame r_ctl %x\n",
3699d92a KP	524	__func__, fh->fh_r_ctl);
	525	fc_frame_free(fp);
	526	ft_sess_put(sess); /* undo get from lookup */
	527	break;
	528	}
	529	}
	530
	531	/*
	532	* Send new command to target.
	533	*/
58fc73d1	534	static void ft_send_work(struct work_struct *work)
3699d92a	535	{
58fc73d1	536	struct ft_cmd *cmd = container_of(work, struct ft_cmd, work);
3699d92a KP	537	struct fc_frame_header *fh = fc_frame_header_get(cmd->req_frame);
	538	struct se_cmd *se_cmd;
	539	struct fcp_cmnd *fcp;
58fc73d1	540	int data_dir = 0;
3699d92a KP	541	u32 data_len;
	542	int task_attr;
	543	int ret;
	544
	545	fcp = fc_frame_payload_get(cmd->req_frame, sizeof(*fcp));
	546	if (!fcp)
	547	goto err;
	548
	549	if (fcp->fc_flags & FCP_CFL_LEN_MASK)
	550	goto err; /* not handling longer CDBs yet */
	551
	552	if (fcp->fc_tm_flags) {
	553	task_attr = FCP_PTA_SIMPLE;
	554	data_dir = DMA_NONE;
	555	data_len = 0;
	556	} else {
	557	switch (fcp->fc_flags & (FCP_CFL_RDDATA \| FCP_CFL_WRDATA)) {
	558	case 0:
	559	data_dir = DMA_NONE;
	560	break;
	561	case FCP_CFL_RDDATA:
	562	data_dir = DMA_FROM_DEVICE;
	563	break;
	564	case FCP_CFL_WRDATA:
	565	data_dir = DMA_TO_DEVICE;
	566	break;
	567	case FCP_CFL_WRDATA \| FCP_CFL_RDDATA:
	568	goto err; /* TBD not supported by tcm_fc yet */
	569	}
61db1802 NB	570	/*
	571	* Locate the SAM Task Attr from fc_pri_ta
	572	*/
	573	switch (fcp->fc_pri_ta & FCP_PTA_MASK) {
	574	case FCP_PTA_HEADQ:
	575	task_attr = MSG_HEAD_TAG;
	576	break;
	577	case FCP_PTA_ORDERED:
	578	task_attr = MSG_ORDERED_TAG;
	579	break;
	580	case FCP_PTA_ACA:
	581	task_attr = MSG_ACA_TAG;
	582	break;
	583	case FCP_PTA_SIMPLE: /* Fallthrough */
	584	default:
	585	task_attr = MSG_SIMPLE_TAG;
	586	}
	587
3699d92a	588
3699d92a KP	589	task_attr = fcp->fc_pri_ta & FCP_PTA_MASK;
	590	data_len = ntohl(fcp->fc_dl);
	591	cmd->cdb = fcp->fc_cdb;
	592	}
	593
	594	se_cmd = &cmd->se_cmd;
	595	/*
	596	* Initialize struct se_cmd descriptor from target_core_mod
	597	* infrastructure
	598	*/
	599	transport_init_se_cmd(se_cmd, &ft_configfs->tf_ops, cmd->sess->se_sess,
	600	data_len, data_dir, task_attr,
	601	&cmd->ft_sense_buffer[0]);
	602	/*
	603	* Check for FCP task management flags
	604	*/
	605	if (fcp->fc_tm_flags) {
	606	ft_send_tm(cmd);
	607	return;
	608	}
	609
	610	fc_seq_exch(cmd->seq)->lp->tt.seq_set_resp(cmd->seq, ft_recv_seq, cmd);
	611
61db9527	612	cmd->lun = scsilun_to_int((struct scsi_lun *)fcp->fc_lun);
5951146d	613	ret = transport_lookup_cmd_lun(&cmd->se_cmd, cmd->lun);
3699d92a KP	614	if (ret < 0) {
	615	ft_dump_cmd(cmd, __func__);
	616	transport_send_check_condition_and_sense(&cmd->se_cmd,
	617	cmd->se_cmd.scsi_sense_reason, 0);
	618	return;
	619	}
	620
	621	ret = transport_generic_allocate_tasks(se_cmd, cmd->cdb);
	622
6708bb27	623	pr_debug("r_ctl %x alloc task ret %d\n", fh->fh_r_ctl, ret);
3699d92a KP	624	ft_dump_cmd(cmd, __func__);
3699d92a KP	625
5951146d	626	if (ret == -ENOMEM) {
3699d92a KP	627	transport_send_check_condition_and_sense(se_cmd,
3699d92a KP	628	TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
82f1c8a4	629	transport_generic_free_cmd(se_cmd, 0);
3699d92a KP	630	return;
3699d92a KP	631	}
5951146d	632	if (ret == -EINVAL) {
3699d92a KP	633	if (se_cmd->se_cmd_flags & SCF_SCSI_RESERVATION_CONFLICT)
	634	ft_queue_status(se_cmd);
	635	else
	636	transport_send_check_condition_and_sense(se_cmd,
	637	se_cmd->scsi_sense_reason, 0);
82f1c8a4	638	transport_generic_free_cmd(se_cmd, 0);
3699d92a KP	639	return;
3699d92a KP	640	}
4ca495e0	641	transport_handle_cdb_direct(se_cmd);
3699d92a KP	642	return;
	643
	644	err:
f2f7b09c	645	ft_send_resp_code_and_free(cmd, FCP_CMND_FIELDS_INVALID);
3699d92a	646	}