RDMA/srpt: Duplicate port name members

Prepare for decoupling the lifetimes of struct srpt_port and struct
srpt_port_id by duplicating the port name into struct srpt_port.

Link: https://lore.kernel.org/r/20220727193415.1583860-2-bvanassche@acm.org
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

Author: bvanassche

drivers/infiniband/ulp/srpt/ib_srpt.c

@@ -566,14 +566,17 @@ static int srpt_refresh_port(struct srpt_port *sport)
 		return ret;
 
 	sport->port_guid_id.wwn.priv = sport;
-	srpt_format_guid(sport->port_guid_id.name,
-			 sizeof(sport->port_guid_id.name),
+	srpt_format_guid(sport->guid_name, ARRAY_SIZE(sport->guid_name),
 			 &sport->gid.global.interface_id);
+	memcpy(sport->port_guid_id.name, sport->guid_name,
+	       ARRAY_SIZE(sport->guid_name));
 	sport->port_gid_id.wwn.priv = sport;
-	snprintf(sport->port_gid_id.name, sizeof(sport->port_gid_id.name),
+	snprintf(sport->gid_name, ARRAY_SIZE(sport->gid_name),
 		 "0x%016llx%016llx",
 		 be64_to_cpu(sport->gid.global.subnet_prefix),
 		 be64_to_cpu(sport->gid.global.interface_id));
+	memcpy(sport->port_gid_id.name, sport->gid_name,
+	       ARRAY_SIZE(sport->gid_name));
 
 	if (rdma_protocol_iwarp(sport->sdev->device, sport->port))
 		return 0;

drivers/infiniband/ulp/srpt/ib_srpt.h

@@ -376,7 +376,7 @@ struct srpt_tpg {
 };
 
 /**
- * struct srpt_port_id - information about an RDMA port name
+ * struct srpt_port_id - LIO RDMA port information
  * @mutex:	Protects @tpg_list changes.
  * @tpg_list:	TPGs associated with the RDMA port name.
  * @wwn:	WWN associated with the RDMA port name.
@@ -402,8 +402,10 @@ struct srpt_port_id {
  * @lid:       cached value of the port's lid.
  * @gid:       cached value of the port's gid.
  * @work:      work structure for refreshing the aforementioned cached values.
- * @port_guid_id: target port GUID
- * @port_gid_id: target port GID
+ * @guid_name: port name in GUID format.
+ * @port_guid_id: LIO target port information for the port name in GUID format.
+ * @gid_name:  port name in GID format.
+ * @port_gid_id: LIO target port information for the port name in GID format.
  * @port_attrib:   Port attributes that can be accessed through configfs.
  * @refcount:	   Number of objects associated with this port.
  * @freed_channels: Completion that will be signaled once @refcount becomes 0.
@@ -419,7 +421,9 @@ struct srpt_port {
 	u32			lid;
 	union ib_gid		gid;
 	struct work_struct	work;
+	char			guid_name[64];
 	struct srpt_port_id	port_guid_id;
+	char			gid_name[64];
 	struct srpt_port_id	port_gid_id;
 	struct srpt_port_attrib port_attrib;
 	atomic_t		refcount;