scsi: fnic: Modify fnic interfaces to use FDLS

Modify fnic driver interfaces to use FDLS and supporting functions.

Refactor code in fnic_probe and fnic_remove.

Get fnic from shost_priv.

Add error handling in stats processing functions.

Modify some print statements.

Add support to do module unload cleanup.

Use placeholder functions/modify function declarations to not break
compilation.

Reviewed-by: Sesidhar Baddela <sebaddel@cisco.com>
Reviewed-by: Arulprabhu Ponnusamy <arulponn@cisco.com>
Reviewed-by: Gian Carlo Boffa <gcboffa@cisco.com>
Co-developed-by: Arun Easi <aeasi@cisco.com>
Signed-off-by: Arun Easi <aeasi@cisco.com>
Co-developed-by: Karan Tilak Kumar <kartilak@cisco.com>
Signed-off-by: Karan Tilak Kumar <kartilak@cisco.com>
Link: https://lore.kernel.org/r/20241212020312.4786-12-kartilak@cisco.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Author: kartilak

drivers/scsi/fnic/fnic.h

@@ -85,6 +85,7 @@
 #define IS_FNIC_FCP_INITIATOR(fnic) (fnic->role == FNIC_ROLE_FCP_INITIATOR)
 
 #define FNIC_FW_RESET_TIMEOUT        60000	/* mSec   */
+#define FNIC_FCOE_MAX_CMD_LEN        16
 /* Retry supported by rport (returned by PRLI service parameters) */
 #define FNIC_FC_RP_FLAGS_RETRY            0x1
 
@@ -344,6 +345,7 @@ struct fnic {
 	int fnic_num;
 	enum fnic_role_e role;
 	struct fnic_iport_s iport;
+	struct Scsi_Host *host;
 	struct fc_lport *lport;
 	struct fcoe_ctlr ctlr;		/* FIP FCoE controller structure */
 	struct vnic_dev_bar bar0;
@@ -464,11 +466,6 @@ struct fnic {
 	____cacheline_aligned struct vnic_intr intr[FNIC_MSIX_INTR_MAX];
 };
 
-static inline struct fnic *fnic_from_ctlr(struct fcoe_ctlr *fip)
-{
-	return container_of(fip, struct fnic, ctlr);
-}
-
 extern struct workqueue_struct *fnic_event_queue;
 extern struct workqueue_struct *fnic_fip_queue;
 extern const struct attribute_group *fnic_host_groups[];
@@ -500,6 +497,7 @@ int fnic_eh_host_reset_handler(struct scsi_cmnd *sc);
 int fnic_host_reset(struct Scsi_Host *shost);
 void fnic_reset(struct Scsi_Host *shost);
 int fnic_issue_fc_host_lip(struct Scsi_Host *shost);
+void fnic_get_host_port_state(struct Scsi_Host *shost);
 void fnic_scsi_fcpio_reset(struct fnic *fnic);
 int fnic_wq_copy_cmpl_handler(struct fnic *fnic, int copy_work_to_do, unsigned int cq_index);
 int fnic_wq_cmpl_handler(struct fnic *fnic, int);
@@ -512,7 +510,7 @@ const char *fnic_state_to_str(unsigned int state);
 void fnic_mq_map_queues_cpus(struct Scsi_Host *host);
 void fnic_log_q_error(struct fnic *fnic);
 void fnic_handle_link_event(struct fnic *fnic);
-void fnic_stats_debugfs_init(struct fnic *fnic);
+int fnic_stats_debugfs_init(struct fnic *fnic);
 void fnic_stats_debugfs_remove(struct fnic *fnic);
 int fnic_is_abts_pending(struct fnic *, struct scsi_cmnd *);
 
@@ -541,6 +539,10 @@ unsigned int fnic_count_lun_ioreqs_wq(struct fnic *fnic, u32 hwq,
 						  struct scsi_device *device);
 unsigned int fnic_count_lun_ioreqs(struct fnic *fnic,
 					   struct scsi_device *device);
+void fnic_scsi_unload(struct fnic *fnic);
+void fnic_scsi_unload_cleanup(struct fnic *fnic);
+int fnic_get_debug_info(struct stats_debug_info *info,
+			struct fnic *fnic);
 
 struct fnic_scsi_iter_data {
 	struct fnic *fnic;

drivers/scsi/fnic/fnic_attrs.c

@@ -11,8 +11,8 @@
 static ssize_t fnic_show_state(struct device *dev,
 			       struct device_attribute *attr, char *buf)
 {
-	struct fc_lport *lp = shost_priv(class_to_shost(dev));
-	struct fnic *fnic = lport_priv(lp);
+	struct fnic *fnic =
+		*((struct fnic **) shost_priv(class_to_shost(dev)));
 
 	return sysfs_emit(buf, "%s\n", fnic_state_str[fnic->state]);
 }
@@ -26,9 +26,13 @@ static ssize_t fnic_show_drv_version(struct device *dev,
 static ssize_t fnic_show_link_state(struct device *dev,
 				    struct device_attribute *attr, char *buf)
 {
-	struct fc_lport *lp = shost_priv(class_to_shost(dev));
+	struct fnic *fnic =
+		*((struct fnic **) shost_priv(class_to_shost(dev)));
 
-	return sysfs_emit(buf, "%s\n", (lp->link_up) ? "Link Up" : "Link Down");
+	return sysfs_emit(buf, "%s\n",
+					  ((fnic->iport.state != FNIC_IPORT_STATE_INIT) &&
+					   (fnic->iport.state != FNIC_IPORT_STATE_LINK_WAIT)) ?
+					  "Link Up" : "Link Down");
 }
 
 static DEVICE_ATTR(fnic_state, S_IRUGO, fnic_show_state, NULL);

drivers/scsi/fnic/fnic_debugfs.c

@@ -7,6 +7,9 @@
 #include <linux/vmalloc.h>
 #include "fnic.h"
 
+extern int fnic_get_debug_info(struct stats_debug_info *debug_buffer,
+							   struct fnic *fnic);
+
 static struct dentry *fnic_trace_debugfs_root;
 static struct dentry *fnic_trace_debugfs_file;
 static struct dentry *fnic_trace_enable;
@@ -593,6 +596,7 @@ static int fnic_stats_debugfs_open(struct inode *inode,
 	debug->buf_size = buf_size;
 	memset((void *)debug->debug_buffer, 0, buf_size);
 	debug->buffer_len = fnic_get_stats_data(debug, fnic_stats);
+	debug->buffer_len += fnic_get_debug_info(debug, fnic);
 
 	file->private_data = debug;
 
@@ -673,26 +677,48 @@ static const struct file_operations fnic_reset_debugfs_fops = {
  * It will create file stats and reset_stats under statistics/host# directory
  * to log per fnic stats.
  */
-void fnic_stats_debugfs_init(struct fnic *fnic)
+int fnic_stats_debugfs_init(struct fnic *fnic)
 {
+	int rc = -1;
 	char name[16];
 
 	snprintf(name, sizeof(name), "host%d", fnic->lport->host->host_no);
 
+	if (!fnic_stats_debugfs_root) {
+		pr_debug("fnic_stats root doesn't exist\n");
+		return rc;
+	}
+
 	fnic->fnic_stats_debugfs_host = debugfs_create_dir(name,
 						fnic_stats_debugfs_root);
 
+	if (!fnic->fnic_stats_debugfs_host) {
+		pr_debug("Cannot create host directory\n");
+		return rc;
+	}
+
 	fnic->fnic_stats_debugfs_file = debugfs_create_file("stats",
 						S_IFREG|S_IRUGO|S_IWUSR,
 						fnic->fnic_stats_debugfs_host,
 						fnic,
 						&fnic_stats_debugfs_fops);
 
+	if (!fnic->fnic_stats_debugfs_file) {
+		pr_debug("Cannot create host stats file\n");
+		return rc;
+	}
+
 	fnic->fnic_reset_debugfs_file = debugfs_create_file("reset_stats",
 						S_IFREG|S_IRUGO|S_IWUSR,
 						fnic->fnic_stats_debugfs_host,
 						fnic,
 						&fnic_reset_debugfs_fops);
+	if (!fnic->fnic_reset_debugfs_file) {
+		pr_debug("Cannot create host stats file\n");
+		return rc;
+	}
+	rc = 0;
+	return rc;
 }
 
 /*

drivers/scsi/fnic/fnic_fcs.c

@@ -63,6 +63,22 @@ static inline  void fnic_fdls_set_fcoe_dstmac(struct fnic *fnic,
 	memcpy(fnic->iport.fcfmac, dst_mac, 6);
 }
 
+void fnic_get_host_port_state(struct Scsi_Host *shost)
+{
+	struct fnic *fnic = *((struct fnic **) shost_priv(shost));
+	struct fnic_iport_s *iport = &fnic->iport;
+	unsigned long flags;
+
+	spin_lock_irqsave(&fnic->fnic_lock, flags);
+	if (!fnic->link_status)
+		fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
+	else if (iport->state == FNIC_IPORT_STATE_READY)
+		fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
+	else
+		fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
+	spin_unlock_irqrestore(&fnic->fnic_lock, flags);
+}
+
 void fnic_fdls_link_status_change(struct fnic *fnic, int linkup)
 {
 	struct fnic_iport_s *iport = &fnic->iport;