scsi: scsi_transport_fc: Introduce encryption group in fc_rport attribute

Introduce a new structure for reporting an encrypted session over an
fc_rport.  The encryption group is added as an attribute in struct
fc_rport and reports information in fc_encryption_info.  This structure
contains a status member variable, which stores a bit value indicating
an encrypted session.

Signed-off-by: Sarah Catania <sarah.catania@broadcom.com>
Signed-off-by: Justin Tee <justin.tee@broadcom.com>
Link: https://patch.msgid.link/20251211001659.138635-2-justintee8345@gmail.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

4 files changed, 63 insertions, 0 deletions

diff --git a/drivers/base/transport_class.c b/drivers/base/transport_class.c
index 09ee2a1e35bb..69c6ac2e8263 100644
--- a/drivers/base/transport_class.c
+++ b/drivers/base/transport_class.c
@@ -169,6 +169,12 @@ static int transport_add_class_device(struct attribute_container *cont,
 			goto err_del;
 	}
 
+	if (tcont->encryption) {
+		error = sysfs_create_group(&classdev->kobj, tcont->encryption);
+		if (error)
+			goto err_del;
+	}
+
 	return 0;
 
 err_del:
@@ -244,6 +250,8 @@ static int transport_remove_classdev(struct attribute_container *cont,
 	if (tclass->remove != anon_transport_dummy_function) {
 		if (tcont->statistics)
 			sysfs_remove_group(&classdev->kobj, tcont->statistics);
+		if (tcont->encryption)
+			sysfs_remove_group(&classdev->kobj, tcont->encryption);
 		attribute_container_class_device_del(classdev);
 	}
 
diff --git a/drivers/scsi/scsi_transport_fc.c b/drivers/scsi/scsi_transport_fc.c
index 987befb02408..b95c46a346fb 100644
--- a/drivers/scsi/scsi_transport_fc.c
+++ b/drivers/scsi/scsi_transport_fc.c
@@ -1328,6 +1328,46 @@ store_fc_rport_fast_io_fail_tmo(struct device *dev,
 static FC_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
 	show_fc_rport_fast_io_fail_tmo, store_fc_rport_fast_io_fail_tmo);
 
+#define fc_rport_encryption(name)							\
+static ssize_t fc_rport_encinfo_##name(struct device *cd,				\
+				       struct device_attribute *attr,			\
+				       char *buf)					\
+{											\
+	struct fc_rport *rport = transport_class_to_rport(cd);				\
+	struct Scsi_Host *shost = rport_to_shost(rport);				\
+	struct fc_internal *i = to_fc_internal(shost->transportt);			\
+	struct fc_encryption_info *info;						\
+	ssize_t ret = -ENOENT;								\
+	u32 data;									\
+											\
+	if (i->f->get_fc_rport_enc_info) {						\
+		info = (i->f->get_fc_rport_enc_info)(rport);				\
+		if (info) {								\
+			data = info->name;						\
+			if (!strcmp(#name, "status")) {					\
+				ret = scnprintf(buf,					\
+						FC_RPORT_ENCRYPTION_STATUS_MAX_LEN,	\
+						"%s\n",					\
+						data ? "Encrypted" : "Unencrypted");	\
+			}								\
+		}									\
+	}										\
+	return ret;									\
+}											\
+static FC_DEVICE_ATTR(rport, encryption_##name, 0444, fc_rport_encinfo_##name, NULL)	\
+
+fc_rport_encryption(status);
+
+static struct attribute *fc_rport_encryption_attrs[] = {
+	&device_attr_rport_encryption_status.attr,
+	NULL
+};
+
+static struct attribute_group fc_rport_encryption_group = {
+	.name = "encryption",
+	.attrs = fc_rport_encryption_attrs,
+};
+
 #define fc_rport_fpin_statistic(name)					\
 static ssize_t fc_rport_fpinstat_##name(struct device *cd,		\
 				  struct device_attribute *attr,	\
@@ -2633,6 +2673,8 @@ fc_attach_transport(struct fc_function_template *ft)
 	i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
 	i->rport_attr_cont.ac.class = &fc_rport_class.class;
 	i->rport_attr_cont.ac.match = fc_rport_match;
+	if (ft->get_fc_rport_enc_info)
+		i->rport_attr_cont.encryption = &fc_rport_encryption_group;
 	i->rport_attr_cont.statistics = &fc_rport_statistics_group;
 	transport_container_register(&i->rport_attr_cont);
 
diff --git a/include/linux/transport_class.h b/include/linux/transport_class.h
index 2efc271a96fa..a009d66db15a 100644
--- a/include/linux/transport_class.h
+++ b/include/linux/transport_class.h
@@ -56,6 +56,7 @@ struct anon_transport_class cls = {				\
 struct transport_container {
 	struct attribute_container ac;
 	const struct attribute_group *statistics;
+	const struct attribute_group *encryption;
 };
 
 #define attribute_container_to_transport_container(x) \
diff --git a/include/scsi/scsi_transport_fc.h b/include/scsi/scsi_transport_fc.h
index b908aacfef48..9f30625aa0d3 100644
--- a/include/scsi/scsi_transport_fc.h
+++ b/include/scsi/scsi_transport_fc.h
@@ -317,6 +317,15 @@ struct fc_fpin_stats {
 	u64 cn_device_specific;
 };
 
+#define FC_RPORT_ENCRYPTION_STATUS_MAX_LEN      14
+/*
+ * Encryption Information
+ */
+struct fc_encryption_info {
+	/* Encryption Status */
+	u8 status;
+};
+
 /* Macro for use in defining Remote Port attributes */
 #define FC_RPORT_ATTR(_name,_mode,_show,_store)				\
 struct device_attribute dev_attr_rport_##_name = 	\
@@ -364,6 +373,7 @@ struct fc_rport {	/* aka fc_starget_attrs */
 	u64 port_name;
 	u32 port_id;
 	u32 roles;
+	struct fc_encryption_info enc_info;
 	enum fc_port_state port_state;	/* Will only be ONLINE or UNKNOWN */
 	u32 scsi_target_id;
 	u32 fast_io_fail_tmo;
@@ -691,6 +701,8 @@ struct fc_function_template {
 	struct fc_host_statistics * (*get_fc_host_stats)(struct Scsi_Host *);
 	void	(*reset_fc_host_stats)(struct Scsi_Host *);
 
+	struct fc_encryption_info * (*get_fc_rport_enc_info)(struct fc_rport *);
+
 	int	(*issue_fc_host_lip)(struct Scsi_Host *);
 
 	void    (*dev_loss_tmo_callbk)(struct fc_rport *);