scsi: fc: Add mechanism to update FPIN signal statistics

Under fc_host_statistics add statistics for Congestion Signals that are
delivered to the host as interrupt signals.

Link: https://lore.kernel.org/r/20201021092715.22669-5-njavali@marvell.com
Reviewed-by: James Smart <james.smart@broadcom.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Shyam Sundar <ssundar@marvell.com>
Signed-off-by: Nilesh Javali <njavali@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/scsi_transport_fc.c b/drivers/scsi/scsi_transport_fc.c
index 4dfa0e4..3f816ab 100644 (file)
--- a/drivers/scsi/scsi_transport_fc.c
+++ b/drivers/scsi/scsi_transport_fc.c
@@ -2100,6 +2100,9 @@ fc_host_statistic(fc_xid_not_found);
 fc_host_statistic(fc_xid_busy);
 fc_host_statistic(fc_seq_not_found);
 fc_host_statistic(fc_non_bls_resp);
+fc_host_statistic(cn_sig_warn);
+fc_host_statistic(cn_sig_alarm);
+
 
 #define fc_host_fpin_statistic(name)                                   \
 static ssize_t fc_host_fpinstat_##name(struct device *cd,              \
@@ -2182,6 +2185,8 @@ static struct attribute *fc_statistics_attrs[] = {
        &device_attr_host_fc_xid_busy.attr,
        &device_attr_host_fc_seq_not_found.attr,
        &device_attr_host_fc_non_bls_resp.attr,
+       &device_attr_host_cn_sig_warn.attr,
+       &device_attr_host_cn_sig_alarm.attr,
        &device_attr_host_reset_statistics.attr,
        &device_attr_host_fpin_dn.attr,
        &device_attr_host_fpin_dn_unknown.attr,

diff --git a/include/scsi/scsi_transport_fc.h b/include/scsi/scsi_transport_fc.h
index a636c19..c759b29 100644 (file)
--- a/include/scsi/scsi_transport_fc.h
+++ b/include/scsi/scsi_transport_fc.h
@@ -468,6 +468,9 @@ struct fc_host_statistics {
        u64 fc_seq_not_found;           /* seq is not found for exchange */
        u64 fc_non_bls_resp;            /* a non BLS response frame with
                                           a sequence responder in new exch */
+       /* Host Congestion Signals */
+       u64 cn_sig_warn;
+       u64 cn_sig_alarm;
 };