[SCSI] scsi_transport_iscsi: Added support to show port_state and port_speed in sysfs

sysfs patch to view port_state:
    /sys/class/iscsi_host/host*/port_state

sysfs patch to view port_speed:
    /sys/class/iscsi_host/host*/port_speed

Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

3 files changed, 84 insertions, 0 deletions

diff --git a/drivers/scsi/scsi_transport_iscsi.c b/drivers/scsi/scsi_transport_iscsi.c
index cfd491437239..97832a2876bd 100644
--- a/drivers/scsi/scsi_transport_iscsi.c
+++ b/drivers/scsi/scsi_transport_iscsi.c
@@ -2476,12 +2476,16 @@ iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
+iscsi_host_attr(port_state, ISCSI_HOST_PARAM_PORT_STATE);
+iscsi_host_attr(port_speed, ISCSI_HOST_PARAM_PORT_SPEED);
 
 static struct attribute *iscsi_host_attrs[] = {
         &dev_attr_host_netdev.attr,
         &dev_attr_host_hwaddress.attr,
         &dev_attr_host_ipaddress.attr,
         &dev_attr_host_initiatorname.attr,
+        &dev_attr_host_port_state.attr,
+        &dev_attr_host_port_speed.attr,
         NULL,
 };
 
@@ -2501,6 +2505,10 @@ static umode_t iscsi_host_attr_is_visible(struct kobject *kobj,
                 param = ISCSI_HOST_PARAM_IPADDRESS;
         else if (attr == &dev_attr_host_initiatorname.attr)
                 param = ISCSI_HOST_PARAM_INITIATOR_NAME;
+        else if (attr == &dev_attr_host_port_state.attr)
+                param = ISCSI_HOST_PARAM_PORT_STATE;
+        else if (attr == &dev_attr_host_port_speed.attr)
+                param = ISCSI_HOST_PARAM_PORT_SPEED;
         else {
                 WARN_ONCE(1, "Invalid host attr");
                 return 0;
@@ -2514,6 +2522,61 @@ static struct attribute_group iscsi_host_group = {
         .is_visible = iscsi_host_attr_is_visible,
 };
 
+/* convert iscsi_port_speed values to ascii string name */
+static const struct {
+        enum iscsi_port_speed   value;
+        char                    *name;
+} iscsi_port_speed_names[] = {
+        {ISCSI_PORT_SPEED_UNKNOWN,      "Unknown" },
+        {ISCSI_PORT_SPEED_10MBPS,       "10 Mbps" },
+        {ISCSI_PORT_SPEED_100MBPS,      "100 Mbps" },
+        {ISCSI_PORT_SPEED_1GBPS,        "1 Gbps" },
+        {ISCSI_PORT_SPEED_10GBPS,       "10 Gbps" },
+};
+
+char *iscsi_get_port_speed_name(struct Scsi_Host *shost)
+{
+        int i;
+        char *speed = "Unknown!";
+        struct iscsi_cls_host *ihost = shost->shost_data;
+        uint32_t port_speed = ihost->port_speed;
+
+        for (i = 0; i < ARRAY_SIZE(iscsi_port_speed_names); i++) {
+                if (iscsi_port_speed_names[i].value & port_speed) {
+                        speed = iscsi_port_speed_names[i].name;
+                        break;
+                }
+        }
+        return speed;
+}
+EXPORT_SYMBOL_GPL(iscsi_get_port_speed_name);
+
+/* convert iscsi_port_state values to ascii string name */
+static const struct {
+        enum iscsi_port_state   value;
+        char                    *name;
+} iscsi_port_state_names[] = {
+        {ISCSI_PORT_STATE_DOWN,         "LINK DOWN" },
+        {ISCSI_PORT_STATE_UP,           "LINK UP" },
+};
+
+char *iscsi_get_port_state_name(struct Scsi_Host *shost)
+{
+        int i;
+        char *state = "Unknown!";
+        struct iscsi_cls_host *ihost = shost->shost_data;
+        uint32_t port_state = ihost->port_state;
+
+        for (i = 0; i < ARRAY_SIZE(iscsi_port_state_names); i++) {
+                if (iscsi_port_state_names[i].value & port_state) {
+                        state = iscsi_port_state_names[i].name;
+                        break;
+                }
+        }
+        return state;
+}
+EXPORT_SYMBOL_GPL(iscsi_get_port_state_name);
+
 static int iscsi_session_match(struct attribute_container *cont,
                            struct device *dev)
 {
diff --git a/include/scsi/iscsi_if.h b/include/scsi/iscsi_if.h
index 2703e3bedbf5..e49b7c8dd217 100644
--- a/include/scsi/iscsi_if.h
+++ b/include/scsi/iscsi_if.h
@@ -416,9 +416,26 @@ enum iscsi_host_param {
         ISCSI_HOST_PARAM_INITIATOR_NAME,
         ISCSI_HOST_PARAM_NETDEV_NAME,
         ISCSI_HOST_PARAM_IPADDRESS,
+        ISCSI_HOST_PARAM_PORT_STATE,
+        ISCSI_HOST_PARAM_PORT_SPEED,
         ISCSI_HOST_PARAM_MAX,
 };
 
+/* iSCSI port Speed */
+enum iscsi_port_speed {
+        ISCSI_PORT_SPEED_UNKNOWN        = 0x1,
+        ISCSI_PORT_SPEED_10MBPS         = 0x2,
+        ISCSI_PORT_SPEED_100MBPS        = 0x4,
+        ISCSI_PORT_SPEED_1GBPS          = 0x8,
+        ISCSI_PORT_SPEED_10GBPS         = 0x10,
+};
+
+/* iSCSI port state */
+enum iscsi_port_state {
+        ISCSI_PORT_STATE_DOWN           = 0x1,
+        ISCSI_PORT_STATE_UP             = 0x2,
+};
+
 #define iscsi_ptr(_handle) ((void*)(unsigned long)_handle)
 #define iscsi_handle(_ptr) ((uint64_t)(unsigned long)_ptr)
 
diff --git a/include/scsi/scsi_transport_iscsi.h b/include/scsi/scsi_transport_iscsi.h
index 2c3a46d102fd..fa7ca4e16020 100644
--- a/include/scsi/scsi_transport_iscsi.h
+++ b/include/scsi/scsi_transport_iscsi.h
@@ -238,6 +238,8 @@ struct iscsi_cls_host {
         atomic_t nr_scans;
         struct mutex mutex;
         struct request_queue *bsg_q;
+        uint32_t port_speed;
+        uint32_t port_state;
 };
 
 #define iscsi_job_to_shost(_job) \
@@ -307,5 +309,7 @@ extern struct iscsi_iface *iscsi_create_iface(struct Scsi_Host *shost,
                                               uint32_t iface_num, int dd_size);
 extern void iscsi_destroy_iface(struct iscsi_iface *iface);
 extern struct iscsi_iface *iscsi_lookup_iface(int handle);
+extern char *iscsi_get_port_speed_name(struct Scsi_Host *shost);
+extern char *iscsi_get_port_state_name(struct Scsi_Host *shost);
 
 #endif