[SCSI] zfcp: Add some statistics provided by the FCP adapter to the sysfs

The new FCP adapter statistics provide a variety of information about
the virtual adapter (subchannel). In order to collect this information
the zfcp driver is extended to query this information.

The information provided by the new FCP adapter statistics can be
fetched by reading from the following files in the sysfs filesystem

/sys/class/scsi_host/host<n>/seconds_active
/sys/class/scsi_host/host<n>/requests
/sys/class/scsi_host/host<n>/megabytes
/sys/class/scsi_host/host<n>/utilization

These are the statistics on a virtual adapter (subchannel) level.

The information provided is raw and not modified or interpreted by any
means.  No interpretation or modification of the values is done by the
zfcp driver.

Signed-off-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 16 insertions, 2 deletions

diff --git a/drivers/s390/scsi/zfcp_fsf.h b/drivers/s390/scsi/zfcp_fsf.h
index 8cce5cc11d50..099970b27001 100644
--- a/drivers/s390/scsi/zfcp_fsf.h
+++ b/drivers/s390/scsi/zfcp_fsf.h
@@ -213,6 +213,7 @@
 #define FSF_FEATURE_HBAAPI_MANAGEMENT           0x00000010
 #define FSF_FEATURE_ELS_CT_CHAINED_SBALS        0x00000020
 #define FSF_FEATURE_UPDATE_ALERT                0x00000100
+#define FSF_FEATURE_MEASUREMENT_DATA            0x00000200
 
 /* host connection features */
 #define FSF_FEATURE_NPIV_MODE                   0x00000001
@@ -340,6 +341,15 @@ struct fsf_qtcb_prefix {
         u8  res1[20];
 } __attribute__ ((packed));
 
+struct fsf_statistics_info {
+        u64 input_req;
+        u64 output_req;
+        u64 control_req;
+        u64 input_mb;
+        u64 output_mb;
+        u64 seconds_act;
+} __attribute__ ((packed));
+
 union fsf_status_qual {
         u8  byte[FSF_STATUS_QUALIFIER_SIZE];
         u16 halfword[FSF_STATUS_QUALIFIER_SIZE / sizeof (u16)];
@@ -436,7 +446,8 @@ struct fsf_qtcb_bottom_config {
         u32 hardware_version;
         u8 serial_number[32];
         struct fsf_nport_serv_param plogi_payload;
-        u8 res4[160];
+        struct fsf_statistics_info stat_info;
+        u8 res4[112];
 } __attribute__ ((packed));
 
 struct fsf_qtcb_bottom_port {
@@ -469,7 +480,10 @@ struct fsf_qtcb_bottom_port {
         u64 control_requests;
         u64 input_mb;           /* where 1 MByte == 1.000.000 Bytes */
         u64 output_mb;          /* where 1 MByte == 1.000.000 Bytes */
-        u8 res2[256];
+        u8 cp_util;
+        u8 cb_util;
+        u8 a_util;
+        u8 res2[253];
 } __attribute__ ((packed));
 
 union fsf_qtcb_bottom {