From: Geliang Tang <tanggeliang@kylinos.cn>

This patch defines a new nvmf_transport_ops named nvme_mptcp_transport,
which is almost the same as nvme_tcp_transport except .type and
.allowed_opts.

MPTCP currently does not support TLS. The four TLS-related options
(NVMF_OPT_TLS, NVMF_OPT_KEYRING, NVMF_OPT_TLS_KEY, and NVMF_OPT_CONCAT)
have been removed from allowed_opts. They will be added back once MPTCP
TLS is supported.

It is registered in nvme_tcp_init_module() and unregistered in
nvme_tcp_cleanup_module().

A separate nvme_mptcp_ctrl_ops structure with .name = "mptcp" is defined
and used for MPTCP controllers.

A MODULE_ALIAS("nvme-mptcp") declaration alongside the other module
metadata is added at the end of the file.

v2:
 - use 'trtype' instead of '--mptcp' (Hannes)

v3:
 - check mptcp protocol from opts->transport instead of passing a
parameter (Hannes).

v4:
 - check CONFIG_MPTCP.

Cc: Hannes Reinecke <hare@suse.de>
Co-developed-by: zhenwei pi <zhenwei.pi@linux.dev>
Signed-off-by: zhenwei pi <zhenwei.pi@linux.dev>
Co-developed-by: Hui Zhu <zhuhui@kylinos.cn>
Signed-off-by: Hui Zhu <zhuhui@kylinos.cn>
Co-developed-by: Gang Yan <yangang@kylinos.cn>
Signed-off-by: Gang Yan <yangang@kylinos.cn>
Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
---
 drivers/nvme/host/tcp.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index 30e4d915011e..30ff6e03b32f 100644
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -3060,6 +3060,20 @@ static struct nvmf_transport_ops nvme_tcp_transport = {
 	.create_ctrl	= nvme_tcp_create_ctrl,
 };
 
+#ifdef CONFIG_MPTCP
+static struct nvmf_transport_ops nvme_mptcp_transport = {
+	.name		= "mptcp",
+	.module		= THIS_MODULE,
+	.required_opts	= NVMF_OPT_TRADDR,
+	.allowed_opts	= NVMF_OPT_TRSVCID | NVMF_OPT_RECONNECT_DELAY |
+			  NVMF_OPT_HOST_TRADDR | NVMF_OPT_CTRL_LOSS_TMO |
+			  NVMF_OPT_HDR_DIGEST | NVMF_OPT_DATA_DIGEST |
+			  NVMF_OPT_NR_WRITE_QUEUES | NVMF_OPT_NR_POLL_QUEUES |
+			  NVMF_OPT_TOS | NVMF_OPT_HOST_IFACE,
+	.create_ctrl	= nvme_tcp_create_ctrl,
+};
+#endif
+
 static int __init nvme_tcp_init_module(void)
 {
 	unsigned int wq_flags = WQ_MEM_RECLAIM | WQ_HIGHPRI | WQ_SYSFS;
@@ -3085,6 +3099,9 @@ static int __init nvme_tcp_init_module(void)
 		atomic_set(&nvme_tcp_cpu_queues[cpu], 0);
 
 	nvmf_register_transport(&nvme_tcp_transport);
+#ifdef CONFIG_MPTCP
+	nvmf_register_transport(&nvme_mptcp_transport);
+#endif
 	return 0;
 }
 
@@ -3092,6 +3109,9 @@ static void __exit nvme_tcp_cleanup_module(void)
 {
 	struct nvme_tcp_ctrl *ctrl;
 
+#ifdef CONFIG_MPTCP
+	nvmf_unregister_transport(&nvme_mptcp_transport);
+#endif
 	nvmf_unregister_transport(&nvme_tcp_transport);
 
 	mutex_lock(&nvme_tcp_ctrl_mutex);
@@ -3108,3 +3128,4 @@ module_exit(nvme_tcp_cleanup_module);
 
 MODULE_DESCRIPTION("NVMe host TCP transport driver");
 MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("nvme-mptcp");
-- 
2.51.0