scsi: fc: Add FPIN statistics to fc_host and fc_rport objects

Add a structure for holding FPIN statistics, for host & rport respectively,
and add associated sysfs nodes:

        /sys/class/fc_host/hostXX/statistics/
        /sys/class/fc_remote_ports/rport-XX\:Y-Z/statistics/

Link: https://lore.kernel.org/r/20201021092715.22669-3-njavali@marvell.comReviewed-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>

drivers/scsi/scsi_transport_fc.c

@@ -22,6 +22,7 @@
 #include <net/netlink.h>
 #include <scsi/scsi_netlink_fc.h>
 #include <scsi/scsi_bsg_fc.h>
+#include <uapi/scsi/fc/fc_els.h>
 #include "scsi_priv.h"
 
 static int fc_queue_work(struct Scsi_Host *, struct work_struct *);
@@ -419,6 +420,7 @@ static int fc_host_setup(struct transport_container *tc, struct device *dev,
 	fc_host->fabric_name = -1;
 	memset(fc_host->symbolic_name, 0, sizeof(fc_host->symbolic_name));
 	memset(fc_host->system_hostname, 0, sizeof(fc_host->system_hostname));
+	memset(&fc_host->fpin_stats, 0, sizeof(fc_host->fpin_stats));
 
 	fc_host->tgtid_bind_type = FC_TGTID_BIND_BY_WWPN;
 
@@ -991,6 +993,67 @@ 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_fpin_statistic(name)					\
+static ssize_t fc_rport_fpinstat_##name(struct device *cd,		\
+				  struct device_attribute *attr,	\
+				  char *buf)				\
+{									\
+	struct fc_rport *rport = transport_class_to_rport(cd);		\
+									\
+	return snprintf(buf, 20, "0x%llx\n", rport->fpin_stats.name);	\
+}									\
+static FC_DEVICE_ATTR(rport, fpin_##name, 0444, fc_rport_fpinstat_##name, NULL)
+
+fc_rport_fpin_statistic(dn);
+fc_rport_fpin_statistic(dn_unknown);
+fc_rport_fpin_statistic(dn_timeout);
+fc_rport_fpin_statistic(dn_unable_to_route);
+fc_rport_fpin_statistic(dn_device_specific);
+fc_rport_fpin_statistic(cn);
+fc_rport_fpin_statistic(cn_clear);
+fc_rport_fpin_statistic(cn_lost_credit);
+fc_rport_fpin_statistic(cn_credit_stall);
+fc_rport_fpin_statistic(cn_oversubscription);
+fc_rport_fpin_statistic(cn_device_specific);
+fc_rport_fpin_statistic(li);
+fc_rport_fpin_statistic(li_failure_unknown);
+fc_rport_fpin_statistic(li_link_failure_count);
+fc_rport_fpin_statistic(li_loss_of_sync_count);
+fc_rport_fpin_statistic(li_loss_of_signals_count);
+fc_rport_fpin_statistic(li_prim_seq_err_count);
+fc_rport_fpin_statistic(li_invalid_tx_word_count);
+fc_rport_fpin_statistic(li_invalid_crc_count);
+fc_rport_fpin_statistic(li_device_specific);
+
+static struct attribute *fc_rport_statistics_attrs[] = {
+	&device_attr_rport_fpin_dn.attr,
+	&device_attr_rport_fpin_dn_unknown.attr,
+	&device_attr_rport_fpin_dn_timeout.attr,
+	&device_attr_rport_fpin_dn_unable_to_route.attr,
+	&device_attr_rport_fpin_dn_device_specific.attr,
+	&device_attr_rport_fpin_li.attr,
+	&device_attr_rport_fpin_li_failure_unknown.attr,
+	&device_attr_rport_fpin_li_link_failure_count.attr,
+	&device_attr_rport_fpin_li_loss_of_sync_count.attr,
+	&device_attr_rport_fpin_li_loss_of_signals_count.attr,
+	&device_attr_rport_fpin_li_prim_seq_err_count.attr,
+	&device_attr_rport_fpin_li_invalid_tx_word_count.attr,
+	&device_attr_rport_fpin_li_invalid_crc_count.attr,
+	&device_attr_rport_fpin_li_device_specific.attr,
+	&device_attr_rport_fpin_cn.attr,
+	&device_attr_rport_fpin_cn_clear.attr,
+	&device_attr_rport_fpin_cn_lost_credit.attr,
+	&device_attr_rport_fpin_cn_credit_stall.attr,
+	&device_attr_rport_fpin_cn_oversubscription.attr,
+	&device_attr_rport_fpin_cn_device_specific.attr,
+	NULL
+};
+
+static struct attribute_group fc_rport_statistics_group = {
+	.name = "statistics",
+	.attrs = fc_rport_statistics_attrs,
+};
+
 
 /*
  * FC SCSI Target Attribute Management
@@ -1745,6 +1808,39 @@ fc_host_statistic(fc_xid_busy);
 fc_host_statistic(fc_seq_not_found);
 fc_host_statistic(fc_non_bls_resp);
 
+#define fc_host_fpin_statistic(name)					\
+static ssize_t fc_host_fpinstat_##name(struct device *cd,		\
+				  struct device_attribute *attr,	\
+				  char *buf)				\
+{									\
+	struct Scsi_Host *shost = transport_class_to_shost(cd);		\
+	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);	\
+									\
+	return snprintf(buf, 20, "0x%llx\n", fc_host->fpin_stats.name);	\
+}									\
+static FC_DEVICE_ATTR(host, fpin_##name, 0444, fc_host_fpinstat_##name, NULL)
+
+fc_host_fpin_statistic(dn);
+fc_host_fpin_statistic(dn_unknown);
+fc_host_fpin_statistic(dn_timeout);
+fc_host_fpin_statistic(dn_unable_to_route);
+fc_host_fpin_statistic(dn_device_specific);
+fc_host_fpin_statistic(cn);
+fc_host_fpin_statistic(cn_clear);
+fc_host_fpin_statistic(cn_lost_credit);
+fc_host_fpin_statistic(cn_credit_stall);
+fc_host_fpin_statistic(cn_oversubscription);
+fc_host_fpin_statistic(cn_device_specific);
+fc_host_fpin_statistic(li);
+fc_host_fpin_statistic(li_failure_unknown);
+fc_host_fpin_statistic(li_link_failure_count);
+fc_host_fpin_statistic(li_loss_of_sync_count);
+fc_host_fpin_statistic(li_loss_of_signals_count);
+fc_host_fpin_statistic(li_prim_seq_err_count);
+fc_host_fpin_statistic(li_invalid_tx_word_count);
+fc_host_fpin_statistic(li_invalid_crc_count);
+fc_host_fpin_statistic(li_device_specific);
+
 static ssize_t
 fc_reset_statistics(struct device *dev, struct device_attribute *attr,
 		    const char *buf, size_t count)
@@ -1794,6 +1890,26 @@ static struct attribute *fc_statistics_attrs[] = {
 	&device_attr_host_fc_seq_not_found.attr,
 	&device_attr_host_fc_non_bls_resp.attr,
 	&device_attr_host_reset_statistics.attr,
+	&device_attr_host_fpin_dn.attr,
+	&device_attr_host_fpin_dn_unknown.attr,
+	&device_attr_host_fpin_dn_timeout.attr,
+	&device_attr_host_fpin_dn_unable_to_route.attr,
+	&device_attr_host_fpin_dn_device_specific.attr,
+	&device_attr_host_fpin_li.attr,
+	&device_attr_host_fpin_li_failure_unknown.attr,
+	&device_attr_host_fpin_li_link_failure_count.attr,
+	&device_attr_host_fpin_li_loss_of_sync_count.attr,
+	&device_attr_host_fpin_li_loss_of_signals_count.attr,
+	&device_attr_host_fpin_li_prim_seq_err_count.attr,
+	&device_attr_host_fpin_li_invalid_tx_word_count.attr,
+	&device_attr_host_fpin_li_invalid_crc_count.attr,
+	&device_attr_host_fpin_li_device_specific.attr,
+	&device_attr_host_fpin_cn.attr,
+	&device_attr_host_fpin_cn_clear.attr,
+	&device_attr_host_fpin_cn_lost_credit.attr,
+	&device_attr_host_fpin_cn_credit_stall.attr,
+	&device_attr_host_fpin_cn_oversubscription.attr,
+	&device_attr_host_fpin_cn_device_specific.attr,
 	NULL
 };
 
@@ -2177,6 +2293,7 @@ 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;
+	i->rport_attr_cont.statistics = &fc_rport_statistics_group;
 	transport_container_register(&i->rport_attr_cont);
 
 	i->vport_attr_cont.ac.attrs = &i->vport_attrs[0];

include/scsi/scsi_transport_fc.h

@@ -285,6 +285,36 @@ struct fc_rport_identifiers {
 	u32 roles;
 };
 
+/*
+ * Fabric Performance Impact Notification Statistics
+ */
+struct fc_fpin_stats {
+	/* Delivery */
+	u64 dn;
+	u64 dn_unknown;
+	u64 dn_timeout;
+	u64 dn_unable_to_route;
+	u64 dn_device_specific;
+
+	/* Link Integrity */
+	u64 li;
+	u64 li_failure_unknown;
+	u64 li_link_failure_count;
+	u64 li_loss_of_sync_count;
+	u64 li_loss_of_signals_count;
+	u64 li_prim_seq_err_count;
+	u64 li_invalid_tx_word_count;
+	u64 li_invalid_crc_count;
+	u64 li_device_specific;
+
+	/* Congestion/Peer Congestion */
+	u64 cn;
+	u64 cn_clear;
+	u64 cn_lost_credit;
+	u64 cn_credit_stall;
+	u64 cn_oversubscription;
+	u64 cn_device_specific;
+};
 
 /* Macro for use in defining Remote Port attributes */
 #define FC_RPORT_ATTR(_name,_mode,_show,_store)				\
@@ -326,6 +356,7 @@ struct fc_rport {	/* aka fc_starget_attrs */
 
 	/* Dynamic Attributes */
 	u32 dev_loss_tmo;	/* Remote Port loss timeout in seconds. */
+	struct fc_fpin_stats fpin_stats;
 
 	/* Private (Transport-managed) Attributes */
 	u64 node_name;
@@ -516,6 +547,7 @@ struct fc_host_attrs {
 	char symbolic_name[FC_SYMBOLIC_NAME_SIZE];
 	char system_hostname[FC_SYMBOLIC_NAME_SIZE];
 	u32 dev_loss_tmo;
+	struct fc_fpin_stats fpin_stats;
 
 	/* Private (Transport-managed) Attributes */
 	enum fc_tgtid_binding_type  tgtid_bind_type;