target: Move task tag into struct se_cmd + support 64-bit tags

Simplify target core and target drivers by storing the task tag
a.k.a. command identifier inside struct se_cmd.

For several transports (e.g. SRP) tags are 64 bits wide.
Hence add support for 64-bit tags.

(Fix core_tmr_abort_task conversion spec warnings - nab)
(Fix up usb-gadget to use 16-bit tags - HCH + bart)
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Andy Grover <agrover@redhat.com>
Cc: Sagi Grimberg <sagig@mellanox.com>
Cc: <qla2xxx-upstream@qlogic.com>
Cc: Felipe Balbi <balbi@ti.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

Documentation/target/tcm_mod_builder.py

@@ -310,7 +310,6 @@ def tcm_mod_build_configfs(proto_ident, fabric_mod_dir_var, fabric_mod_name):
 	buf += "	.write_pending			= " + fabric_mod_name + "_write_pending,\n"
 	buf += "	.write_pending_status		= " + fabric_mod_name + "_write_pending_status,\n"
 	buf += "	.set_default_node_attributes	= " + fabric_mod_name + "_set_default_node_attrs,\n"
-	buf += "	.get_task_tag			= " + fabric_mod_name + "_get_task_tag,\n"
 	buf += "	.get_cmd_state			= " + fabric_mod_name + "_get_cmd_state,\n"
 	buf += "	.queue_data_in			= " + fabric_mod_name + "_queue_data_in,\n"
 	buf += "	.queue_status			= " + fabric_mod_name + "_queue_status,\n"
@@ -525,13 +524,6 @@ def tcm_mod_dump_fabric_ops(proto_ident, fabric_mod_dir_var, fabric_mod_name):
 			buf += "}\n\n"
 			bufi += "void " + fabric_mod_name + "_set_default_node_attrs(struct se_node_acl *);\n"
 
-		if re.search('get_task_tag\)\(', fo):
-			buf += "u32 " + fabric_mod_name + "_get_task_tag(struct se_cmd *se_cmd)\n"
-			buf += "{\n"
-			buf += "	return 0;\n"
-			buf += "}\n\n"
-			bufi += "u32 " + fabric_mod_name + "_get_task_tag(struct se_cmd *);\n"
-
 		if re.search('get_cmd_state\)\(', fo):
 			buf += "int " + fabric_mod_name + "_get_cmd_state(struct se_cmd *se_cmd)\n"
 			buf += "{\n"

drivers/infiniband/ulp/srpt/ib_srpt.c

@@ -1339,7 +1339,7 @@ static int srpt_abort_cmd(struct srpt_send_ioctx *ioctx)
 	}
 
 	pr_debug("Aborting cmd with state %d and tag %lld\n", state,
-		 ioctx->tag);
+		 ioctx->cmd.tag);
 
 	switch (state) {
 	case SRPT_STATE_NEW:
@@ -1701,7 +1701,7 @@ static int srpt_handle_cmd(struct srpt_rdma_ch *ch,
 
 	srp_cmd = recv_ioctx->ioctx.buf;
 	cmd = &send_ioctx->cmd;
-	send_ioctx->tag = srp_cmd->tag;
+	cmd->tag = srp_cmd->tag;
 
 	switch (srp_cmd->task_attr) {
 	case SRP_CMD_SIMPLE_Q:
@@ -1772,7 +1772,7 @@ static int srpt_rx_mgmt_fn_tag(struct srpt_send_ioctx *ioctx, u64 tag)
 	for (i = 0; i < ch->rq_size; ++i) {
 		target = ch->ioctx_ring[i];
 		if (target->cmd.se_lun == ioctx->cmd.se_lun &&
-		    target->tag == tag &&
+		    target->cmd.tag == tag &&
 		    srpt_get_cmd_state(target) != SRPT_STATE_DONE) {
 			ret = 0;
 			/* now let the target core abort &target->cmd; */
@@ -1831,7 +1831,7 @@ static void srpt_handle_tsk_mgmt(struct srpt_rdma_ch *ch,
 		 srp_tsk->task_tag, srp_tsk->tag, ch->cm_id, ch->sess);
 
 	srpt_set_cmd_state(send_ioctx, SRPT_STATE_MGMT);
-	send_ioctx->tag = srp_tsk->tag;
+	send_ioctx->cmd.tag = srp_tsk->tag;
 	tcm_tmr = srp_tmr_to_tcm(srp_tsk->tsk_mgmt_func);
 	if (tcm_tmr < 0) {
 		send_ioctx->cmd.se_tmr_req->response =
@@ -2979,7 +2979,7 @@ static int srpt_write_pending(struct se_cmd *se_cmd)
 	case CH_DRAINING:
 	case CH_RELEASING:
 		pr_debug("cmd with tag %lld: channel disconnecting\n",
-			 ioctx->tag);
+			 ioctx->cmd.tag);
 		srpt_set_cmd_state(ioctx, SRPT_STATE_DATA_IN);
 		ret = -EINVAL;
 		goto out;
@@ -3054,24 +3054,24 @@ static void srpt_queue_response(struct se_cmd *cmd)
 		ret = srpt_xfer_data(ch, ioctx);
 		if (ret) {
 			pr_err("xfer_data failed for tag %llu\n",
-			       ioctx->tag);
+			       ioctx->cmd.tag);
 			return;
 		}
 	}
 
 	if (state != SRPT_STATE_MGMT)
-		resp_len = srpt_build_cmd_rsp(ch, ioctx, ioctx->tag,
+		resp_len = srpt_build_cmd_rsp(ch, ioctx, ioctx->cmd.tag,
 					      cmd->scsi_status);
 	else {
 		srp_tm_status
 			= tcm_to_srp_tsk_mgmt_status(cmd->se_tmr_req->response);
 		resp_len = srpt_build_tskmgmt_rsp(ch, ioctx, srp_tm_status,
-						 ioctx->tag);
+						 ioctx->cmd.tag);
 	}
 	ret = srpt_post_send(ch, ioctx, resp_len);
 	if (ret) {
 		pr_err("sending cmd response failed for tag %llu\n",
-		       ioctx->tag);
+		       ioctx->cmd.tag);
 		srpt_unmap_sg_to_ib_sge(ch, ioctx);
 		srpt_set_cmd_state(ioctx, SRPT_STATE_DONE);
 		target_put_sess_cmd(&ioctx->cmd);
@@ -3479,14 +3479,6 @@ static void srpt_set_default_node_attrs(struct se_node_acl *nacl)
 {
 }
 
-static u32 srpt_get_task_tag(struct se_cmd *se_cmd)
-{
-	struct srpt_send_ioctx *ioctx;
-
-	ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd);
-	return ioctx->tag;
-}
-
 /* Note: only used from inside debug printk's by the TCM core. */
 static int srpt_get_tcm_cmd_state(struct se_cmd *se_cmd)
 {
@@ -3838,7 +3830,6 @@ static const struct target_core_fabric_ops srpt_template = {
 	.write_pending			= srpt_write_pending,
 	.write_pending_status		= srpt_write_pending_status,
 	.set_default_node_attributes	= srpt_set_default_node_attrs,
-	.get_task_tag			= srpt_get_task_tag,
 	.get_cmd_state			= srpt_get_tcm_cmd_state,
 	.queue_data_in			= srpt_queue_data_in,
 	.queue_status			= srpt_queue_status,

drivers/infiniband/ulp/srpt/ib_srpt.h

@@ -238,7 +238,6 @@ struct srpt_send_ioctx {
 	bool			rdma_aborted;
 	struct se_cmd		cmd;
 	struct completion	tx_done;
-	u64			tag;
 	int			sg_cnt;
 	int			mapped_sg_count;
 	u16			n_rdma_ius;

drivers/scsi/qla2xxx/qla_target.c

@@ -1191,7 +1191,7 @@ static int __qlt_24xx_handle_abts(struct scsi_qla_host *vha,
 	list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list) {
 		struct qla_tgt_cmd *cmd =
 			container_of(se_cmd, struct qla_tgt_cmd, se_cmd);
-		if (cmd->tag == abts->exchange_addr_to_abort) {
+		if (se_cmd->tag == abts->exchange_addr_to_abort) {
 			lun = cmd->unpacked_lun;
 			found_lun = true;
 			break;
@@ -1728,9 +1728,8 @@ static int qlt_pre_xmit_response(struct qla_tgt_cmd *cmd,
 
 	if (unlikely(cmd->aborted)) {
 		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf014,
-		    "qla_target(%d): terminating exchange "
-		    "for aborted cmd=%p (se_cmd=%p, tag=%d)", vha->vp_idx, cmd,
-		    se_cmd, cmd->tag);
+		       "qla_target(%d): terminating exchange for aborted cmd=%p (se_cmd=%p, tag=%lld)",
+		       vha->vp_idx, cmd, se_cmd, se_cmd->tag);
 
 		cmd->state = QLA_TGT_STATE_ABORTED;
 		cmd->cmd_flags |= BIT_6;
@@ -1765,18 +1764,17 @@ static int qlt_pre_xmit_response(struct qla_tgt_cmd *cmd,
 	if (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
 		prm->residual = se_cmd->residual_count;
 		ql_dbg(ql_dbg_io + ql_dbg_verbose, vha, 0x305c,
-		    "Residual underflow: %d (tag %d, "
-		    "op %x, bufflen %d, rq_result %x)\n", prm->residual,
-		    cmd->tag, se_cmd->t_task_cdb ? se_cmd->t_task_cdb[0] : 0,
-		    cmd->bufflen, prm->rq_result);
+		    "Residual underflow: %d (tag %lld, op %x, bufflen %d, rq_result %x)\n",
+		       prm->residual, se_cmd->tag,
+		       se_cmd->t_task_cdb ? se_cmd->t_task_cdb[0] : 0,
+		       cmd->bufflen, prm->rq_result);
 		prm->rq_result |= SS_RESIDUAL_UNDER;
 	} else if (se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
 		prm->residual = se_cmd->residual_count;
 		ql_dbg(ql_dbg_io, vha, 0x305d,
-		    "Residual overflow: %d (tag %d, "
-		    "op %x, bufflen %d, rq_result %x)\n", prm->residual,
-		    cmd->tag, se_cmd->t_task_cdb ? se_cmd->t_task_cdb[0] : 0,
-		    cmd->bufflen, prm->rq_result);
+		    "Residual overflow: %d (tag %lld, op %x, bufflen %d, rq_result %x)\n",
+		       prm->residual, se_cmd->tag, se_cmd->t_task_cdb ?
+		       se_cmd->t_task_cdb[0] : 0, cmd->bufflen, prm->rq_result);
 		prm->rq_result |= SS_RESIDUAL_OVER;
 	}
 
@@ -1849,7 +1847,7 @@ static void qlt_check_srr_debug(struct qla_tgt_cmd *cmd, int *xmit_type)
 	    == 50) {
 		*xmit_type &= ~QLA_TGT_XMIT_STATUS;
 		ql_dbg(ql_dbg_tgt_mgt, cmd->vha, 0xf015,
-		    "Dropping cmd %p (tag %d) status", cmd, cmd->tag);
+		    "Dropping cmd %p (tag %d) status", cmd, se_cmd->tag);
 	}
 #endif
 	/*
@@ -1873,7 +1871,7 @@ static void qlt_check_srr_debug(struct qla_tgt_cmd *cmd, int *xmit_type)
 		ql_dbg(ql_dbg_tgt_mgt, cmd->vha, 0xf016,
 		    "Cutting cmd %p (tag %d) buffer"
 		    " tail to len %d, sg_cnt %d (cmd->bufflen %d,"
-		    " cmd->sg_cnt %d)", cmd, cmd->tag, tot_len, leave,
+		    " cmd->sg_cnt %d)", cmd, se_cmd->tag, tot_len, leave,
 		    cmd->bufflen, cmd->sg_cnt);
 
 		cmd->bufflen = tot_len;
@@ -1885,13 +1883,13 @@ static void qlt_check_srr_debug(struct qla_tgt_cmd *cmd, int *xmit_type)
 
 		ql_dbg(ql_dbg_tgt_mgt, cmd->vha, 0xf017,
 		    "Cutting cmd %p (tag %d) buffer head "
-		    "to offset %d (cmd->bufflen %d)", cmd, cmd->tag, offset,
+		    "to offset %d (cmd->bufflen %d)", cmd, se_cmd->tag, offset,
 		    cmd->bufflen);
 		if (offset == 0)
 			*xmit_type &= ~QLA_TGT_XMIT_DATA;
 		else if (qlt_set_data_offset(cmd, offset)) {
 			ql_dbg(ql_dbg_tgt_mgt, cmd->vha, 0xf018,
-			    "qlt_set_data_offset() failed (tag %d)", cmd->tag);
+			    "qlt_set_data_offset() failed (tag %d)", se_cmd->tag);
 		}
 	}
 }
@@ -3194,7 +3192,7 @@ static void qlt_do_ctio_completion(struct scsi_qla_host *vha, uint32_t handle,
 		return;
 	} else if (cmd->state == QLA_TGT_STATE_ABORTED) {
 		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf01e,
-		    "Aborted command %p (tag %d) finished\n", cmd, cmd->tag);
+		  "Aborted command %p (tag %lld) finished\n", cmd, se_cmd->tag);
 	} else {
 		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf05c,
 		    "qla_target(%d): A command in state (%d) should "
@@ -3266,7 +3264,7 @@ static void __qlt_do_work(struct qla_tgt_cmd *cmd)
 		goto out_term;
 
 	cdb = &atio->u.isp24.fcp_cmnd.cdb[0];
-	cmd->tag = atio->u.isp24.exchange_addr;
+	cmd->se_cmd.tag = atio->u.isp24.exchange_addr;
 	cmd->unpacked_lun = scsilun_to_int(
 	    (struct scsi_lun *)&atio->u.isp24.fcp_cmnd.lun);
 
@@ -3891,9 +3889,8 @@ static void qlt_handle_srr(struct scsi_qla_host *vha,
 			resp = 1;
 		} else {
 			ql_dbg(ql_dbg_tgt_mgt, vha, 0xf064,
-			    "qla_target(%d): SRR for in data for cmd "
-			    "without them (tag %d, SCSI status %d), "
-			    "reject", vha->vp_idx, cmd->tag,
+			       "qla_target(%d): SRR for in data for cmd without them (tag %lld, SCSI status %d), reject",
+			       vha->vp_idx, se_cmd->tag,
 			    cmd->se_cmd.scsi_status);
 			goto out_reject;
 		}
@@ -3927,10 +3924,8 @@ static void qlt_handle_srr(struct scsi_qla_host *vha,
 			}
 		} else {
 			ql_dbg(ql_dbg_tgt_mgt, vha, 0xf066,
-			    "qla_target(%d): SRR for out data for cmd "
-			    "without them (tag %d, SCSI status %d), "
-			    "reject", vha->vp_idx, cmd->tag,
-			    cmd->se_cmd.scsi_status);
+			    "qla_target(%d): SRR for out data for cmd without them (tag %lld, SCSI status %d), reject",
+			       vha->vp_idx, se_cmd->tag, cmd->se_cmd.scsi_status);
 			goto out_reject;
 		}
 		break;
@@ -4051,10 +4046,9 @@ static void qlt_handle_srr_work(struct work_struct *work)
 		cmd->sg = se_cmd->t_data_sg;
 
 		ql_dbg(ql_dbg_tgt_mgt, vha, 0xf02c,
-		    "SRR cmd %p (se_cmd %p, tag %d, op %x), "
-		    "sg_cnt=%d, offset=%d", cmd, &cmd->se_cmd, cmd->tag,
-		    se_cmd->t_task_cdb ? se_cmd->t_task_cdb[0] : 0,
-		    cmd->sg_cnt, cmd->offset);
+		       "SRR cmd %p (se_cmd %p, tag %lld, op %x), sg_cnt=%d, offset=%d",
+		       cmd, &cmd->se_cmd, se_cmd->tag, se_cmd->t_task_cdb ?
+		       se_cmd->t_task_cdb[0] : 0, cmd->sg_cnt, cmd->offset);
 
 		qlt_handle_srr(vha, sctio, imm);
 

drivers/scsi/qla2xxx/qla_target.h

@@ -924,7 +924,6 @@ struct qla_tgt_cmd {
 	int sg_cnt;		/* SG segments count */
 	int bufflen;		/* cmd buffer length */
 	int offset;
-	uint32_t tag;
 	uint32_t unpacked_lun;
 	enum dma_data_direction dma_data_direction;
 	uint32_t reset_count;

drivers/scsi/qla2xxx/tcm_qla2xxx.c

@@ -421,19 +421,6 @@ static void tcm_qla2xxx_set_default_node_attrs(struct se_node_acl *nacl)
 	return;
 }
 
-static u32 tcm_qla2xxx_get_task_tag(struct se_cmd *se_cmd)
-{
-	struct qla_tgt_cmd *cmd;
-
-	/* check for task mgmt cmd */
-	if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
-		return 0xffffffff;
-
-	cmd = container_of(se_cmd, struct qla_tgt_cmd, se_cmd);
-
-	return cmd->tag;
-}
-
 static int tcm_qla2xxx_get_cmd_state(struct se_cmd *se_cmd)
 {
 	return 0;
@@ -1865,7 +1852,6 @@ static const struct target_core_fabric_ops tcm_qla2xxx_ops = {
 	.write_pending			= tcm_qla2xxx_write_pending,
 	.write_pending_status		= tcm_qla2xxx_write_pending_status,
 	.set_default_node_attributes	= tcm_qla2xxx_set_default_node_attrs,
-	.get_task_tag			= tcm_qla2xxx_get_task_tag,
 	.get_cmd_state			= tcm_qla2xxx_get_cmd_state,
 	.queue_data_in			= tcm_qla2xxx_queue_data_in,
 	.queue_status			= tcm_qla2xxx_queue_status,
@@ -1910,7 +1896,6 @@ static const struct target_core_fabric_ops tcm_qla2xxx_npiv_ops = {
 	.write_pending			= tcm_qla2xxx_write_pending,
 	.write_pending_status		= tcm_qla2xxx_write_pending_status,
 	.set_default_node_attributes	= tcm_qla2xxx_set_default_node_attrs,
-	.get_task_tag			= tcm_qla2xxx_get_task_tag,
 	.get_cmd_state			= tcm_qla2xxx_get_cmd_state,
 	.queue_data_in			= tcm_qla2xxx_queue_data_in,
 	.queue_status			= tcm_qla2xxx_queue_status,

drivers/target/iscsi/iscsi_target.c

@@ -1008,6 +1008,8 @@ int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 	if (cmd->sense_reason)
 		goto attach_cmd;
 
+	/* only used for printks or comparing with ->ref_task_tag */
+	cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
 	cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
 	if (cmd->sense_reason) {
 		if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {

drivers/target/iscsi/iscsi_target_configfs.c

@@ -1692,14 +1692,6 @@ static char *iscsi_get_fabric_name(void)
 	return "iSCSI";
 }
 
-static u32 iscsi_get_task_tag(struct se_cmd *se_cmd)
-{
-	struct iscsi_cmd *cmd = container_of(se_cmd, struct iscsi_cmd, se_cmd);
-
-	/* only used for printks or comparism with ->ref_task_tag */
-	return (__force u32)cmd->init_task_tag;
-}
-
 static int iscsi_get_cmd_state(struct se_cmd *se_cmd)
 {
 	struct iscsi_cmd *cmd = container_of(se_cmd, struct iscsi_cmd, se_cmd);
@@ -1938,7 +1930,6 @@ const struct target_core_fabric_ops iscsi_ops = {
 	.write_pending			= lio_write_pending,
 	.write_pending_status		= lio_write_pending_status,
 	.set_default_node_attributes	= lio_set_default_node_attributes,
-	.get_task_tag			= iscsi_get_task_tag,
 	.get_cmd_state			= iscsi_get_cmd_state,
 	.queue_data_in			= lio_queue_data_in,
 	.queue_status			= lio_queue_status,

drivers/target/loopback/tcm_loop.c

@@ -165,6 +165,7 @@ static void tcm_loop_submission_work(struct work_struct *work)
 		transfer_length = scsi_bufflen(sc);
 	}
 
+	se_cmd->tag = tl_cmd->sc_cmd_tag;
 	rc = target_submit_cmd_map_sgls(se_cmd, tl_nexus->se_sess, sc->cmnd,
 			&tl_cmd->tl_sense_buf[0], tl_cmd->sc->device->lun,
 			transfer_length, TCM_SIMPLE_TAG,
@@ -597,14 +598,6 @@ 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)
-{
-	struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
-			struct tcm_loop_cmd, tl_se_cmd);
-
-	return tl_cmd->sc_cmd_tag;
-}
-
 static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd)
 {
 	struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
@@ -1259,7 +1252,6 @@ static const struct target_core_fabric_ops loop_ops = {
 	.write_pending			= tcm_loop_write_pending,
 	.write_pending_status		= tcm_loop_write_pending_status,
 	.set_default_node_attributes	= tcm_loop_set_default_node_attributes,
-	.get_task_tag			= tcm_loop_get_task_tag,
 	.get_cmd_state			= tcm_loop_get_cmd_state,
 	.queue_data_in			= tcm_loop_queue_data_in,
 	.queue_status			= tcm_loop_queue_status,

drivers/target/sbp/sbp_target.c

@@ -1234,6 +1234,8 @@ static void sbp_handle_command(struct sbp_target_request *req)
 	pr_debug("sbp_handle_command ORB:0x%llx unpacked_lun:%d data_len:%d data_dir:%d\n",
 			req->orb_pointer, unpacked_lun, data_length, data_dir);
 
+	/* only used for printk until we do TMRs */
+	req->se_cmd.tag = req->orb_pointer;
 	if (target_submit_cmd(&req->se_cmd, sess->se_sess, req->cmd_buf,
 			      req->sense_buf, unpacked_lun, data_length,
 			      TCM_SIMPLE_TAG, data_dir, 0))
@@ -1768,15 +1770,6 @@ static void sbp_set_default_node_attrs(struct se_node_acl *nacl)
 	return;
 }
 
-static u32 sbp_get_task_tag(struct se_cmd *se_cmd)
-{
-	struct sbp_target_request *req = container_of(se_cmd,
-			struct sbp_target_request, se_cmd);
-
-	/* only used for printk until we do TMRs */
-	return (u32)req->orb_pointer;
-}
-
 static int sbp_get_cmd_state(struct se_cmd *se_cmd)
 {
 	return 0;
@@ -2377,7 +2370,6 @@ static const struct target_core_fabric_ops sbp_ops = {
 	.write_pending			= sbp_write_pending,
 	.write_pending_status		= sbp_write_pending_status,
 	.set_default_node_attributes	= sbp_set_default_node_attrs,
-	.get_task_tag			= sbp_get_task_tag,
 	.get_cmd_state			= sbp_get_cmd_state,
 	.queue_data_in			= sbp_queue_data_in,
 	.queue_status			= sbp_queue_status,

drivers/target/target_core_configfs.c

@@ -374,10 +374,6 @@ static int target_fabric_tf_ops_check(const struct target_core_fabric_ops *tfo)
 		pr_err("Missing tfo->set_default_node_attributes()\n");
 		return -EINVAL;
 	}
-	if (!tfo->get_task_tag) {
-		pr_err("Missing tfo->get_task_tag()\n");
-		return -EINVAL;
-	}
 	if (!tfo->get_cmd_state) {
 		pr_err("Missing tfo->get_cmd_state()\n");
 		return -EINVAL;

drivers/target/target_core_tmr.c

@@ -117,7 +117,7 @@ void core_tmr_abort_task(
 {
 	struct se_cmd *se_cmd;
 	unsigned long flags;
-	int ref_tag;
+	u64 ref_tag;
 
 	spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
 	list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list) {
@@ -129,16 +129,17 @@ void core_tmr_abort_task(
 		if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
 			continue;
 
-		ref_tag = se_cmd->se_tfo->get_task_tag(se_cmd);
+		ref_tag = se_cmd->tag;
 		if (tmr->ref_task_tag != ref_tag)
 			continue;
 
-		printk("ABORT_TASK: Found referenced %s task_tag: %u\n",
+		printk("ABORT_TASK: Found referenced %s task_tag: %llu\n",
 			se_cmd->se_tfo->get_fabric_name(), ref_tag);
 
 		spin_lock(&se_cmd->t_state_lock);
 		if (se_cmd->transport_state & CMD_T_COMPLETE) {
-			printk("ABORT_TASK: ref_tag: %u already complete, skipping\n", ref_tag);
+			printk("ABORT_TASK: ref_tag: %llu already complete,"
+			       " skipping\n", ref_tag);
 			spin_unlock(&se_cmd->t_state_lock);
 			spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
 			goto out;
@@ -157,14 +158,14 @@ void core_tmr_abort_task(
 		transport_cmd_finish_abort(se_cmd, true);
 
 		printk("ABORT_TASK: Sending TMR_FUNCTION_COMPLETE for"
-				" ref_tag: %d\n", ref_tag);
+				" ref_tag: %llu\n", ref_tag);
 		tmr->response = TMR_FUNCTION_COMPLETE;
 		return;
 	}
 	spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
 
 out:
-	printk("ABORT_TASK: Sending TMR_TASK_DOES_NOT_EXIST for ref_tag: %d\n",
+	printk("ABORT_TASK: Sending TMR_TASK_DOES_NOT_EXIST for ref_tag: %lld\n",
 			tmr->ref_task_tag);
 	tmr->response = TMR_TASK_DOES_NOT_EXIST;
 }
@@ -289,16 +290,16 @@ static void core_tmr_drain_state_list(
 		list_del(&cmd->state_list);
 
 		pr_debug("LUN_RESET: %s cmd: %p"
-			" ITT/CmdSN: 0x%08x/0x%08x, i_state: %d, t_state: %d"
+			" ITT/CmdSN: 0x%08llx/0x%08x, i_state: %d, t_state: %d"
 			"cdb: 0x%02x\n",
 			(preempt_and_abort_list) ? "Preempt" : "", cmd,
-			cmd->se_tfo->get_task_tag(cmd), 0,
+			cmd->tag, 0,
 			cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
 			cmd->t_task_cdb[0]);
-		pr_debug("LUN_RESET: ITT[0x%08x] - pr_res_key: 0x%016Lx"
+		pr_debug("LUN_RESET: ITT[0x%08llx] - pr_res_key: 0x%016Lx"
 			" -- CMD_T_ACTIVE: %d"
 			" CMD_T_STOP: %d CMD_T_SENT: %d\n",
-			cmd->se_tfo->get_task_tag(cmd), cmd->pr_res_key,
+			cmd->tag, cmd->pr_res_key,
 			(cmd->transport_state & CMD_T_ACTIVE) != 0,
 			(cmd->transport_state & CMD_T_STOP) != 0,
 			(cmd->transport_state & CMD_T_SENT) != 0);

drivers/target/target_core_transport.c

@@ -600,9 +600,8 @@ static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists,
 	 * this command for frontend exceptions.
 	 */
 	if (cmd->transport_state & CMD_T_STOP) {
-		pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
-			__func__, __LINE__,
-			cmd->se_tfo->get_task_tag(cmd));
+		pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
+			__func__, __LINE__, cmd->tag);
 
 		spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 
@@ -1155,6 +1154,8 @@ target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
 /*
  * Used by fabric modules containing a local struct se_cmd within their
  * fabric dependent per I/O descriptor.
+ *
+ * Preserves the value of @cmd->tag.
  */
 void transport_init_se_cmd(
 	struct se_cmd *cmd,
@@ -1380,6 +1381,8 @@ transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
  * @sgl_prot: struct scatterlist memory protection information
  * @sgl_prot_count: scatterlist count for protection information
  *
+ * Task tags are supported if the caller has set @se_cmd->tag.
+ *
  * Returns non zero to signal active I/O shutdown failure.  All other
  * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
  * but still return zero here.
@@ -1512,6 +1515,8 @@ EXPORT_SYMBOL(target_submit_cmd_map_sgls);
  * @data_dir: DMA data direction
  * @flags: flags for command submission from target_sc_flags_tables
  *
+ * Task tags are supported if the caller has set @se_cmd->tag.
+ *
  * Returns non zero to signal active I/O shutdown failure.  All other
  * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
  * but still return zero here.
@@ -1639,9 +1644,8 @@ void transport_generic_request_failure(struct se_cmd *cmd,
 {
 	int ret = 0;
 
-	pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
-		" CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
-		cmd->t_task_cdb[0]);
+	pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08llx"
+		" CDB: 0x%02x\n", cmd, cmd->tag, cmd->t_task_cdb[0]);
 	pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
 		cmd->se_tfo->get_cmd_state(cmd),
 		cmd->t_state, sense_reason);
@@ -1849,9 +1853,8 @@ void target_execute_cmd(struct se_cmd *cmd)
 	 */
 	spin_lock_irq(&cmd->t_state_lock);
 	if (cmd->transport_state & CMD_T_STOP) {
-		pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
-			__func__, __LINE__,
-			cmd->se_tfo->get_task_tag(cmd));
+		pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08llx\n",
+			__func__, __LINE__, cmd->tag);
 
 		spin_unlock_irq(&cmd->t_state_lock);
 		complete_all(&cmd->t_transport_stop_comp);
@@ -2658,10 +2661,8 @@ bool transport_wait_for_tasks(struct se_cmd *cmd)
 
 	cmd->transport_state |= CMD_T_STOP;
 
-	pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
-		" i_state: %d, t_state: %d, CMD_T_STOP\n",
-		cmd, cmd->se_tfo->get_task_tag(cmd),
-		cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
+	pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08llx i_state: %d, t_state: %d, CMD_T_STOP\n",
+		cmd, cmd->tag, cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
 
 	spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 
@@ -2670,9 +2671,8 @@ bool transport_wait_for_tasks(struct se_cmd *cmd)
 	spin_lock_irqsave(&cmd->t_state_lock, flags);
 	cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
 
-	pr_debug("wait_for_tasks: Stopped wait_for_completion("
-		"&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
-		cmd->se_tfo->get_task_tag(cmd));
+	pr_debug("wait_for_tasks: Stopped wait_for_completion(&cmd->t_transport_stop_comp) for ITT: 0x%08llx\n",
+		cmd->tag);
 
 	spin_unlock_irqrestore(&cmd->t_state_lock, flags);
 
@@ -2974,8 +2974,8 @@ int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
 	if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS))
 		return 1;
 
-	pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
-		 cmd->t_task_cdb[0], cmd->se_tfo->get_task_tag(cmd));
+	pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08llx\n",
+		 cmd->t_task_cdb[0], cmd->tag);
 
 	cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
 	cmd->scsi_status = SAM_STAT_TASK_ABORTED;
@@ -3014,9 +3014,8 @@ void transport_send_task_abort(struct se_cmd *cmd)
 
 	transport_lun_remove_cmd(cmd);
 
-	pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
-		" ITT: 0x%08x\n", cmd->t_task_cdb[0],
-		cmd->se_tfo->get_task_tag(cmd));
+	pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x, ITT: 0x%08llx\n",
+		 cmd->t_task_cdb[0], cmd->tag);
 
 	trace_target_cmd_complete(cmd);
 	cmd->se_tfo->queue_status(cmd);

drivers/target/target_core_xcopy.c

@@ -359,11 +359,6 @@ static char *xcopy_pt_get_fabric_name(void)
         return "xcopy-pt";
 }
 
-static u32 xcopy_pt_get_tag(struct se_cmd *se_cmd)
-{
-        return 0;
-}
-
 static int xcopy_pt_get_cmd_state(struct se_cmd *se_cmd)
 {
         return 0;
@@ -424,7 +419,6 @@ static int xcopy_pt_queue_status(struct se_cmd *se_cmd)
 
 static const struct target_core_fabric_ops xcopy_pt_tfo = {
 	.get_fabric_name	= xcopy_pt_get_fabric_name,
-	.get_task_tag		= xcopy_pt_get_tag,
 	.get_cmd_state		= xcopy_pt_get_cmd_state,
 	.release_cmd		= xcopy_pt_release_cmd,
 	.check_stop_free	= xcopy_pt_check_stop_free,
@@ -575,6 +569,7 @@ static int target_xcopy_setup_pt_cmd(
 	xpt_cmd->xcopy_op = xop;
 	target_xcopy_setup_pt_port(xpt_cmd, xop, remote_port);
 
+	cmd->tag = 0;
 	sense_rc = target_setup_cmd_from_cdb(cmd, cdb);
 	if (sense_rc) {
 		ret = -EINVAL;

drivers/target/tcm_fc/tcm_fc.h

@@ -157,7 +157,6 @@ int ft_queue_status(struct se_cmd *);
 int ft_queue_data_in(struct se_cmd *);
 int ft_write_pending(struct se_cmd *);
 int ft_write_pending_status(struct se_cmd *);
-u32 ft_get_task_tag(struct se_cmd *);
 int ft_get_cmd_state(struct se_cmd *);
 void ft_queue_tm_resp(struct se_cmd *);
 void ft_aborted_task(struct se_cmd *);

drivers/target/tcm_fc/tfc_cmd.c

@@ -247,15 +247,6 @@ int ft_write_pending(struct se_cmd *se_cmd)
 	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);
-
-	if (cmd->aborted)
-		return ~0;
-	return fc_seq_exch(cmd->seq)->rxid;
-}
-
 int ft_get_cmd_state(struct se_cmd *se_cmd)
 {
 	return 0;
@@ -568,6 +559,7 @@ static void ft_send_work(struct work_struct *work)
 	}
 
 	fc_seq_exch(cmd->seq)->lp->tt.seq_set_resp(cmd->seq, ft_recv_seq, cmd);
+	cmd->se_cmd.tag = fc_seq_exch(cmd->seq)->rxid;
 	/*
 	 * Use a single se_cmd->cmd_kref as we expect to release se_cmd
 	 * directly from ft_check_stop_free callback in response path.

drivers/target/tcm_fc/tfc_conf.c

@@ -468,7 +468,6 @@ static const struct target_core_fabric_ops ft_fabric_ops = {
 	.write_pending =		ft_write_pending,
 	.write_pending_status =		ft_write_pending_status,
 	.set_default_node_attributes =	ft_set_default_node_attr,
-	.get_task_tag =			ft_get_task_tag,
 	.get_cmd_state =		ft_get_cmd_state,
 	.queue_data_in =		ft_queue_data_in,
 	.queue_status =			ft_queue_status,

drivers/usb/gadget/legacy/tcm_usb_gadget.c

@@ -1112,6 +1112,7 @@ static int usbg_submit_command(struct f_uas *fu,
 	memcpy(cmd->cmd_buf, cmd_iu->cdb, cmd_len);
 
 	cmd->tag = be16_to_cpup(&cmd_iu->tag);
+	cmd->se_cmd.tag = cmd->tag;
 	if (fu->flags & USBG_USE_STREAMS) {
 		if (cmd->tag > UASP_SS_EP_COMP_NUM_STREAMS)
 			goto err;
@@ -1245,6 +1246,7 @@ static int bot_submit_command(struct f_uas *fu,
 	cmd->unpacked_lun = cbw->Lun;
 	cmd->is_read = cbw->Flags & US_BULK_FLAG_IN ? 1 : 0;
 	cmd->data_len = le32_to_cpu(cbw->DataTransferLength);
+	cmd->se_cmd.tag = le32_to_cpu(cmd->bot_tag);
 
 	INIT_WORK(&cmd->work, bot_cmd_work);
 	ret = queue_work(tpg->workqueue, &cmd->work);
@@ -1340,18 +1342,6 @@ static void usbg_set_default_node_attrs(struct se_node_acl *nacl)
 	return;
 }
 
-static u32 usbg_get_task_tag(struct se_cmd *se_cmd)
-{
-	struct usbg_cmd *cmd = container_of(se_cmd, struct usbg_cmd,
-			se_cmd);
-	struct f_uas *fu = cmd->fu;
-
-	if (fu->flags & USBG_IS_BOT)
-		return le32_to_cpu(cmd->bot_tag);
-	else
-		return cmd->tag;
-}
-
 static int usbg_get_cmd_state(struct se_cmd *se_cmd)
 {
 	return 0;
@@ -1739,7 +1729,6 @@ static const struct target_core_fabric_ops usbg_ops = {
 	.write_pending			= usbg_send_write_request,
 	.write_pending_status		= usbg_write_pending_status,
 	.set_default_node_attributes	= usbg_set_default_node_attrs,
-	.get_task_tag			= usbg_get_task_tag,
 	.get_cmd_state			= usbg_get_cmd_state,
 	.queue_data_in			= usbg_send_read_response,
 	.queue_status			= usbg_send_status_response,

drivers/vhost/scsi.c

@@ -369,11 +369,6 @@ static void vhost_scsi_set_default_node_attrs(struct se_node_acl *nacl)
 	return;
 }
 
-static u32 vhost_scsi_get_task_tag(struct se_cmd *se_cmd)
-{
-	return 0;
-}
-
 static int vhost_scsi_get_cmd_state(struct se_cmd *se_cmd)
 {
 	return 0;
@@ -818,6 +813,7 @@ static void vhost_scsi_submission_work(struct work_struct *work)
 	}
 	tv_nexus = cmd->tvc_nexus;
 
+	se_cmd->tag = 0;
 	rc = target_submit_cmd_map_sgls(se_cmd, tv_nexus->tvn_se_sess,
 			cmd->tvc_cdb, &cmd->tvc_sense_buf[0],
 			cmd->tvc_lun, cmd->tvc_exp_data_len,
@@ -2148,7 +2144,6 @@ static struct target_core_fabric_ops vhost_scsi_ops = {
 	.write_pending			= vhost_scsi_write_pending,
 	.write_pending_status		= vhost_scsi_write_pending_status,
 	.set_default_node_attributes	= vhost_scsi_set_default_node_attrs,
-	.get_task_tag			= vhost_scsi_get_task_tag,
 	.get_cmd_state			= vhost_scsi_get_cmd_state,
 	.queue_data_in			= vhost_scsi_queue_data_in,
 	.queue_status			= vhost_scsi_queue_status,

drivers/xen/xen-scsiback.c

@@ -400,6 +400,7 @@ static void scsiback_cmd_exec(struct vscsibk_pend *pending_req)
 	memset(se_cmd, 0, sizeof(*se_cmd));
 
 	scsiback_get(pending_req->info);
+	se_cmd->tag = pending_req->rqid;
 	rc = target_submit_cmd_map_sgls(se_cmd, sess, pending_req->cmnd,
 			pending_req->sense_buffer, pending_req->v2p->lun,
 			pending_req->data_len, 0,
@@ -1394,14 +1395,6 @@ static void scsiback_set_default_node_attrs(struct se_node_acl *nacl)
 {
 }
 
-static u32 scsiback_get_task_tag(struct se_cmd *se_cmd)
-{
-	struct vscsibk_pend *pending_req = container_of(se_cmd,
-				struct vscsibk_pend, se_cmd);
-
-	return pending_req->rqid;
-}
-
 static int scsiback_get_cmd_state(struct se_cmd *se_cmd)
 {
 	return 0;
@@ -1833,7 +1826,6 @@ static const struct target_core_fabric_ops scsiback_ops = {
 	.write_pending			= scsiback_write_pending,
 	.write_pending_status		= scsiback_write_pending_status,
 	.set_default_node_attributes	= scsiback_set_default_node_attrs,
-	.get_task_tag			= scsiback_get_task_tag,
 	.get_cmd_state			= scsiback_get_cmd_state,
 	.queue_data_in			= scsiback_queue_data_in,
 	.queue_status			= scsiback_queue_status,

include/target/target_core_base.h

@@ -420,7 +420,7 @@ struct se_tmr_req {
 	u8			response;
 	int			call_transport;
 	/* Reference to ITT that Task Mgmt should be performed */
-	u32			ref_task_tag;
+	u64			ref_task_tag;
 	void 			*fabric_tmr_ptr;
 	struct se_cmd		*task_cmd;
 	struct se_device	*tmr_dev;
@@ -473,6 +473,7 @@ struct se_cmd {
 	u8			scsi_asc;
 	u8			scsi_ascq;
 	u16			scsi_sense_length;
+	u64			tag; /* SAM command identifier aka task tag */
 	/* Delay for ALUA Active/NonOptimized state access in milliseconds */
 	int			alua_nonop_delay;
 	/* See include/linux/dma-mapping.h */

include/target/target_core_fabric.h

@@ -53,7 +53,6 @@ struct target_core_fabric_ops {
 	int (*write_pending)(struct se_cmd *);
 	int (*write_pending_status)(struct se_cmd *);
 	void (*set_default_node_attributes)(struct se_node_acl *);
-	u32 (*get_task_tag)(struct se_cmd *);
 	int (*get_cmd_state)(struct se_cmd *);
 	int (*queue_data_in)(struct se_cmd *);
 	int (*queue_status)(struct se_cmd *);