target: Add TFO->abort_task for aborted task resources release

Now that TASK_ABORTED status is not generated for all cases by
TMR ABORT_TASK + LUN_RESET, a new TFO->abort_task() caller is
necessary in order to give fabric drivers a chance to unmap
hardware / software resources before the se_cmd descriptor is
released via the normal TFO->release_cmd() codepath.

This patch adds TFO->aborted_task() in core_tmr_abort_task()
in place of the original transport_send_task_abort(), and
also updates all fabric drivers to implement this caller.

The fabric drivers that include changes to perform cleanup
via ->aborted_task() are:

  - iscsi-target
  - iser-target
  - srpt
  - tcm_qla2xxx

The fabric drivers that currently set ->aborted_task() to
NOPs are:

  - loopback
  - tcm_fc
  - usb-gadget
  - sbp-target
  - vhost-scsi

For the latter five, there appears to be no additional cleanup
required before invoking TFO->release_cmd() to release the
se_cmd descriptor.

v2 changes:
  - Move ->aborted_task() call into transport_cmd_finish_abort (Alex)

Cc: Alex Leung <amleung21@yahoo.com>
Cc: Mark Rustad <mark.d.rustad@intel.com>
Cc: Roland Dreier <roland@kernel.org>
Cc: Vu Pham <vu@mellanox.com>
Cc: Chris Boot <bootc@bootc.net>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Giridhar Malavali <giridhar.malavali@qlogic.com>
Cc: Saurav Kashyap <saurav.kashyap@qlogic.com>
Cc: Quinn Tran <quinn.tran@qlogic.com>
Cc: Sagi Grimberg <sagig@mellanox.com>
Cc: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

drivers/infiniband/ulp/isert/ib_isert.c

@@ -2162,6 +2162,24 @@ isert_put_response(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 	return isert_post_response(isert_conn, isert_cmd);
 }
 
+static void
+isert_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
+{
+	struct isert_cmd *isert_cmd = iscsit_priv_cmd(cmd);
+	struct isert_conn *isert_conn = (struct isert_conn *)conn->context;
+	struct isert_device *device = isert_conn->conn_device;
+
+	spin_lock_bh(&conn->cmd_lock);
+	if (!list_empty(&cmd->i_conn_node))
+		list_del_init(&cmd->i_conn_node);
+	spin_unlock_bh(&conn->cmd_lock);
+
+	if (cmd->data_direction == DMA_TO_DEVICE)
+		iscsit_stop_dataout_timer(cmd);
+
+	device->unreg_rdma_mem(isert_cmd, isert_conn);
+}
+
 static int
 isert_put_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
 		bool nopout_response)
@@ -3217,6 +3235,7 @@ static struct iscsit_transport iser_target_transport = {
 	.iscsit_get_dataout	= isert_get_dataout,
 	.iscsit_queue_data_in	= isert_put_datain,
 	.iscsit_queue_status	= isert_put_response,
+	.iscsit_aborted_task	= isert_aborted_task,
 };
 
 static int __init isert_init(void)

drivers/infiniband/ulp/srpt/ib_srpt.c

@@ -3081,6 +3081,14 @@ static void srpt_queue_tm_rsp(struct se_cmd *cmd)
 	srpt_queue_response(cmd);
 }
 
+static void srpt_aborted_task(struct se_cmd *cmd)
+{
+	struct srpt_send_ioctx *ioctx = container_of(cmd,
+				struct srpt_send_ioctx, cmd);
+
+	srpt_unmap_sg_to_ib_sge(ioctx->ch, ioctx);
+}
+
 static int srpt_queue_status(struct se_cmd *cmd)
 {
 	struct srpt_send_ioctx *ioctx;
@@ -3928,6 +3936,7 @@ static struct target_core_fabric_ops srpt_template = {
 	.queue_data_in			= srpt_queue_data_in,
 	.queue_status			= srpt_queue_status,
 	.queue_tm_rsp			= srpt_queue_tm_rsp,
+	.aborted_task			= srpt_aborted_task,
 	/*
 	 * Setup function pointers for generic logic in
 	 * target_core_fabric_configfs.c

drivers/scsi/qla2xxx/tcm_qla2xxx.c

@@ -684,6 +684,20 @@ static void tcm_qla2xxx_queue_tm_rsp(struct se_cmd *se_cmd)
 	qlt_xmit_tm_rsp(mcmd);
 }
 
+static void tcm_qla2xxx_aborted_task(struct se_cmd *se_cmd)
+{
+	struct qla_tgt_cmd *cmd = container_of(se_cmd,
+				struct qla_tgt_cmd, se_cmd);
+	struct scsi_qla_host *vha = cmd->vha;
+	struct qla_hw_data *ha = vha->hw;
+
+	if (!cmd->sg_mapped)
+		return;
+
+	pci_unmap_sg(ha->pdev, cmd->sg, cmd->sg_cnt, cmd->dma_data_direction);
+	cmd->sg_mapped = 0;
+}
+
 /* Local pointer to allocated TCM configfs fabric module */
 struct target_fabric_configfs *tcm_qla2xxx_fabric_configfs;
 struct target_fabric_configfs *tcm_qla2xxx_npiv_fabric_configfs;
@@ -1877,6 +1891,7 @@ static struct target_core_fabric_ops tcm_qla2xxx_ops = {
 	.queue_data_in			= tcm_qla2xxx_queue_data_in,
 	.queue_status			= tcm_qla2xxx_queue_status,
 	.queue_tm_rsp			= tcm_qla2xxx_queue_tm_rsp,
+	.aborted_task			= tcm_qla2xxx_aborted_task,
 	/*
 	 * Setup function pointers for generic logic in
 	 * target_core_fabric_configfs.c
@@ -1926,6 +1941,7 @@ static struct target_core_fabric_ops tcm_qla2xxx_npiv_ops = {
 	.queue_data_in			= tcm_qla2xxx_queue_data_in,
 	.queue_status			= tcm_qla2xxx_queue_status,
 	.queue_tm_rsp			= tcm_qla2xxx_queue_tm_rsp,
+	.aborted_task			= tcm_qla2xxx_aborted_task,
 	/*
 	 * Setup function pointers for generic logic in
 	 * target_core_fabric_configfs.c

drivers/target/iscsi/iscsi_target.c

@@ -499,6 +499,18 @@ static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 	return 0;
 }
 
+static void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
+{
+	bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD);
+
+	spin_lock_bh(&conn->cmd_lock);
+	if (!list_empty(&cmd->i_conn_node))
+		list_del_init(&cmd->i_conn_node);
+	spin_unlock_bh(&conn->cmd_lock);
+
+	__iscsit_free_cmd(cmd, scsi_cmd, true);
+}
+
 static struct iscsit_transport iscsi_target_transport = {
 	.name			= "iSCSI/TCP",
 	.transport_type		= ISCSI_TCP,
@@ -513,6 +525,7 @@ static struct iscsit_transport iscsi_target_transport = {
 	.iscsit_response_queue	= iscsit_response_queue,
 	.iscsit_queue_data_in	= iscsit_queue_rsp,
 	.iscsit_queue_status	= iscsit_queue_rsp,
+	.iscsit_aborted_task	= iscsit_aborted_task,
 };
 
 static int __init iscsi_target_init_module(void)

drivers/target/iscsi/iscsi_target_configfs.c

@@ -1821,6 +1821,13 @@ static void lio_queue_tm_rsp(struct se_cmd *se_cmd)
 	iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
 }
 
+static void lio_aborted_task(struct se_cmd *se_cmd)
+{
+	struct iscsi_cmd *cmd = container_of(se_cmd, struct iscsi_cmd, se_cmd);
+
+	cmd->conn->conn_transport->iscsit_aborted_task(cmd->conn, cmd);
+}
+
 static char *lio_tpg_get_endpoint_wwn(struct se_portal_group *se_tpg)
 {
 	struct iscsi_portal_group *tpg = se_tpg->se_tpg_fabric_ptr;
@@ -2005,6 +2012,7 @@ int iscsi_target_register_configfs(void)
 	fabric->tf_ops.queue_data_in = &lio_queue_data_in;
 	fabric->tf_ops.queue_status = &lio_queue_status;
 	fabric->tf_ops.queue_tm_rsp = &lio_queue_tm_rsp;
+	fabric->tf_ops.aborted_task = &lio_aborted_task;
 	/*
 	 * Setup function pointers for generic logic in target_core_fabric_configfs.c
 	 */

drivers/target/iscsi/iscsi_target_util.c

@@ -705,7 +705,7 @@ void iscsit_release_cmd(struct iscsi_cmd *cmd)
 }
 EXPORT_SYMBOL(iscsit_release_cmd);
 
-static void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool scsi_cmd,
+void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool scsi_cmd,
 		       bool check_queues)
 {
 	struct iscsi_conn *conn = cmd->conn;

drivers/target/iscsi/iscsi_target_util.h

@@ -30,6 +30,7 @@ extern void iscsit_remove_cmd_from_tx_queues(struct iscsi_cmd *, struct iscsi_co
 extern bool iscsit_conn_all_queues_empty(struct iscsi_conn *);
 extern void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *);
 extern void iscsit_release_cmd(struct iscsi_cmd *);
+extern void __iscsit_free_cmd(struct iscsi_cmd *, bool, bool);
 extern void iscsit_free_cmd(struct iscsi_cmd *, bool);
 extern int iscsit_check_session_usage_count(struct iscsi_session *);
 extern void iscsit_dec_session_usage_count(struct iscsi_session *);

drivers/target/loopback/tcm_loop.c

@@ -919,6 +919,11 @@ static void tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd)
 	wake_up(&tl_tmr->tl_tmr_wait);
 }
 
+static void tcm_loop_aborted_task(struct se_cmd *se_cmd)
+{
+	return;
+}
+
 static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba)
 {
 	switch (tl_hba->tl_proto_id) {
@@ -1487,6 +1492,7 @@ static int tcm_loop_register_configfs(void)
 	fabric->tf_ops.queue_data_in = &tcm_loop_queue_data_in;
 	fabric->tf_ops.queue_status = &tcm_loop_queue_status;
 	fabric->tf_ops.queue_tm_rsp = &tcm_loop_queue_tm_rsp;
+	fabric->tf_ops.aborted_task = &tcm_loop_aborted_task;
 
 	/*
 	 * Setup function pointers for generic logic in target_core_fabric_configfs.c

drivers/target/sbp/sbp_target.c

@@ -1846,6 +1846,11 @@ static void sbp_queue_tm_rsp(struct se_cmd *se_cmd)
 {
 }
 
+static void sbp_aborted_task(struct se_cmd *se_cmd)
+{
+	return;
+}
+
 static int sbp_check_stop_free(struct se_cmd *se_cmd)
 {
 	struct sbp_target_request *req = container_of(se_cmd,
@@ -2526,6 +2531,7 @@ static struct target_core_fabric_ops sbp_ops = {
 	.queue_data_in			= sbp_queue_data_in,
 	.queue_status			= sbp_queue_status,
 	.queue_tm_rsp			= sbp_queue_tm_rsp,
+	.aborted_task			= sbp_aborted_task,
 	.check_stop_free		= sbp_check_stop_free,
 
 	.fabric_make_wwn		= sbp_make_tport,

drivers/target/target_core_configfs.c

@@ -457,6 +457,10 @@ static int target_fabric_tf_ops_check(
 		pr_err("Missing tfo->queue_tm_rsp()\n");
 		return -EINVAL;
 	}
+	if (!tfo->aborted_task) {
+		pr_err("Missing tfo->aborted_task()\n");
+		return -EINVAL;
+	}
 	/*
 	 * We at least require tfo->fabric_make_wwn(), tfo->fabric_drop_wwn()
 	 * tfo->fabric_make_tpg() and tfo->fabric_drop_tpg() in

drivers/target/target_core_transport.c

@@ -605,6 +605,12 @@ void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
 {
 	if (cmd->se_cmd_flags & SCF_SE_LUN_CMD)
 		transport_lun_remove_cmd(cmd);
+	/*
+	 * Allow the fabric driver to unmap any resources before
+	 * releasing the descriptor via TFO->release_cmd()
+	 */
+	if (remove)
+		cmd->se_tfo->aborted_task(cmd);
 
 	if (transport_cmd_check_stop_to_fabric(cmd))
 		return;

drivers/target/tcm_fc/tcm_fc.h

@@ -163,6 +163,7 @@ 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 *);
 
 /*
  * other internal functions.

drivers/target/tcm_fc/tfc_cmd.c

@@ -426,6 +426,11 @@ void ft_queue_tm_resp(struct se_cmd *se_cmd)
 	ft_send_resp_code(cmd, code);
 }
 
+void ft_aborted_task(struct se_cmd *se_cmd)
+{
+	return;
+}
+
 static void ft_send_work(struct work_struct *work);
 
 /*

drivers/target/tcm_fc/tfc_conf.c

@@ -536,6 +536,7 @@ static struct target_core_fabric_ops ft_fabric_ops = {
 	.queue_data_in =		ft_queue_data_in,
 	.queue_status =			ft_queue_status,
 	.queue_tm_rsp =			ft_queue_tm_resp,
+	.aborted_task =			ft_aborted_task,
 	/*
 	 * Setup function pointers for generic logic in
 	 * target_core_fabric_configfs.c

drivers/usb/gadget/tcm_usb_gadget.c

@@ -1471,6 +1471,11 @@ static void usbg_queue_tm_rsp(struct se_cmd *se_cmd)
 {
 }
 
+static void usbg_aborted_task(struct se_cmd *se_cmd)
+{
+	return;
+}
+
 static const char *usbg_check_wwn(const char *name)
 {
 	const char *n;
@@ -1897,6 +1902,7 @@ static struct target_core_fabric_ops usbg_ops = {
 	.queue_data_in			= usbg_send_read_response,
 	.queue_status			= usbg_send_status_response,
 	.queue_tm_rsp			= usbg_queue_tm_rsp,
+	.aborted_task			= usbg_aborted_task,
 	.check_stop_free		= usbg_check_stop_free,
 
 	.fabric_make_wwn		= usbg_make_tport,

drivers/vhost/scsi.c

@@ -539,6 +539,11 @@ static void tcm_vhost_queue_tm_rsp(struct se_cmd *se_cmd)
 	return;
 }
 
+static void tcm_vhost_aborted_task(struct se_cmd *se_cmd)
+{
+	return;
+}
+
 static void tcm_vhost_free_evt(struct vhost_scsi *vs, struct tcm_vhost_evt *evt)
 {
 	vs->vs_events_nr--;
@@ -2131,6 +2136,7 @@ static struct target_core_fabric_ops tcm_vhost_ops = {
 	.queue_data_in			= tcm_vhost_queue_data_in,
 	.queue_status			= tcm_vhost_queue_status,
 	.queue_tm_rsp			= tcm_vhost_queue_tm_rsp,
+	.aborted_task			= tcm_vhost_aborted_task,
 	/*
 	 * Setup callers for generic logic in target_core_fabric_configfs.c
 	 */

include/target/iscsi/iscsi_transport.h

@@ -21,6 +21,7 @@ struct iscsit_transport {
 	int (*iscsit_get_dataout)(struct iscsi_conn *, struct iscsi_cmd *, bool);
 	int (*iscsit_queue_data_in)(struct iscsi_conn *, struct iscsi_cmd *);
 	int (*iscsit_queue_status)(struct iscsi_conn *, struct iscsi_cmd *);
+	void (*iscsit_aborted_task)(struct iscsi_conn *, struct iscsi_cmd *);
 };
 
 static inline void *iscsit_priv_cmd(struct iscsi_cmd *cmd)

include/target/target_core_fabric.h

@@ -62,6 +62,7 @@ struct target_core_fabric_ops {
 	int (*queue_data_in)(struct se_cmd *);
 	int (*queue_status)(struct se_cmd *);
 	void (*queue_tm_rsp)(struct se_cmd *);
+	void (*aborted_task)(struct se_cmd *);
 	/*
 	 * fabric module calls for target_core_fabric_configfs.c
 	 */