scsi: target: iscsit: isert: Alloc per conn cmd counter

[ Upstream commit 6d256be ]

This has iscsit allocate a per conn cmd counter and converts iscsit/isert
to use it instead of the per session one.

Signed-off-by: Mike Christie <michael.christie@oracle.com>
Link: https://lore.kernel.org/r/20230319015620.96006-5-michael.christie@oracle.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Stable-dep-of: 395cee8 ("scsi: target: iscsit: Stop/wait on cmds during conn close")
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/infiniband/ulp/isert/ib_isert.c

@@ -2506,8 +2506,8 @@ isert_wait4cmds(struct iscsit_conn *conn)
 	isert_info("iscsit_conn %p\n", conn);
 
 	if (conn->sess) {
-		target_stop_session(conn->sess->se_sess);
-		target_wait_for_sess_cmds(conn->sess->se_sess);
+		target_stop_cmd_counter(conn->cmd_cnt);
+		target_wait_for_cmds(conn->cmd_cnt);
 	}
 }
 

drivers/target/iscsi/iscsi_target.c

@@ -1193,7 +1193,7 @@ int iscsit_setup_scsi_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
 			  conn->sess->se_sess, be32_to_cpu(hdr->data_length),
 			  cmd->data_direction, sam_task_attr,
 			  cmd->sense_buffer + 2, scsilun_to_int(&hdr->lun),
-			  conn->sess->se_sess->cmd_cnt);
+			  conn->cmd_cnt);
 
 	pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
 		" ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
@@ -2057,7 +2057,7 @@ iscsit_handle_task_mgt_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
 			  conn->sess->se_sess, 0, DMA_NONE,
 			  TCM_SIMPLE_TAG, cmd->sense_buffer + 2,
 			  scsilun_to_int(&hdr->lun),
-			  conn->sess->se_sess->cmd_cnt);
+			  conn->cmd_cnt);
 
 	target_get_sess_cmd(&cmd->se_cmd, true);
 

drivers/target/iscsi/iscsi_target_login.c

@@ -324,18 +324,8 @@ static int iscsi_login_zero_tsih_s1(
 		goto free_ops;
 	}
 
-	/*
-	 * This is temp for iser. It will be moved to per conn in later
-	 * patches for iscsi.
-	 */
-	sess->se_sess->cmd_cnt = target_alloc_cmd_counter();
-	if (!sess->se_sess->cmd_cnt)
-		goto free_se_sess;
-
 	return 0;
 
-free_se_sess:
-	transport_free_session(sess->se_sess);
 free_ops:
 	kfree(sess->sess_ops);
 free_id:
@@ -1157,8 +1147,14 @@ static struct iscsit_conn *iscsit_alloc_conn(struct iscsi_np *np)
 		goto free_conn_cpumask;
 	}
 
+	conn->cmd_cnt = target_alloc_cmd_counter();
+	if (!conn->cmd_cnt)
+		goto free_conn_allowed_cpumask;
+
 	return conn;
 
+free_conn_allowed_cpumask:
+	free_cpumask_var(conn->allowed_cpumask);
 free_conn_cpumask:
 	free_cpumask_var(conn->conn_cpumask);
 free_conn_ops:
@@ -1172,6 +1168,7 @@ static struct iscsit_conn *iscsit_alloc_conn(struct iscsi_np *np)
 
 void iscsit_free_conn(struct iscsit_conn *conn)
 {
+	target_free_cmd_counter(conn->cmd_cnt);
 	free_cpumask_var(conn->allowed_cpumask);
 	free_cpumask_var(conn->conn_cpumask);
 	kfree(conn->conn_ops);

drivers/target/target_core_transport.c

@@ -254,7 +254,7 @@ struct target_cmd_counter *target_alloc_cmd_counter(void)
 }
 EXPORT_SYMBOL_GPL(target_alloc_cmd_counter);
 
-static void target_free_cmd_counter(struct target_cmd_counter *cmd_cnt)
+void target_free_cmd_counter(struct target_cmd_counter *cmd_cnt)
 {
 	/*
 	 * Drivers like loop do not call target_stop_session during session
@@ -265,6 +265,7 @@ static void target_free_cmd_counter(struct target_cmd_counter *cmd_cnt)
 
 	percpu_ref_exit(&cmd_cnt->refcnt);
 }
+EXPORT_SYMBOL_GPL(target_free_cmd_counter);
 
 /**
  * transport_init_session - initialize a session object
@@ -3170,13 +3171,14 @@ static void target_stop_cmd_counter_confirm(struct percpu_ref *ref)
  * target_stop_cmd_counter - Stop new IO from being added to the counter.
  * @cmd_cnt: counter to stop
  */
-static void target_stop_cmd_counter(struct target_cmd_counter *cmd_cnt)
+void target_stop_cmd_counter(struct target_cmd_counter *cmd_cnt)
 {
 	pr_debug("Stopping command counter.\n");
 	if (!atomic_cmpxchg(&cmd_cnt->stopped, 0, 1))
 		percpu_ref_kill_and_confirm(&cmd_cnt->refcnt,
 					    target_stop_cmd_counter_confirm);
 }
+EXPORT_SYMBOL_GPL(target_stop_cmd_counter);
 
 /**
  * target_stop_session - Stop new IO from being queued on the session.
@@ -3192,7 +3194,7 @@ EXPORT_SYMBOL(target_stop_session);
  * target_wait_for_cmds - Wait for outstanding cmds.
  * @cmd_cnt: counter to wait for active I/O for.
  */
-static void target_wait_for_cmds(struct target_cmd_counter *cmd_cnt)
+void target_wait_for_cmds(struct target_cmd_counter *cmd_cnt)
 {
 	int ret;
 
@@ -3208,6 +3210,7 @@ static void target_wait_for_cmds(struct target_cmd_counter *cmd_cnt)
 	wait_for_completion(&cmd_cnt->stop_done);
 	pr_debug("Waiting for cmds done.\n");
 }
+EXPORT_SYMBOL_GPL(target_wait_for_cmds);
 
 /**
  * target_wait_for_sess_cmds - Wait for outstanding commands

include/target/target_core_fabric.h

@@ -133,7 +133,10 @@ struct se_session *target_setup_session(struct se_portal_group *,
 				struct se_session *, void *));
 void target_remove_session(struct se_session *);
 
+void target_stop_cmd_counter(struct target_cmd_counter *cmd_cnt);
+void target_wait_for_cmds(struct target_cmd_counter *cmd_cnt);
 struct target_cmd_counter *target_alloc_cmd_counter(void);
+void target_free_cmd_counter(struct target_cmd_counter *cmd_cnt);
 
 void transport_init_session(struct se_session *se_sess);
 struct se_session *transport_alloc_session(enum target_prot_op);