1 files changed, 505 insertions, 86 deletions

diff --git a/drivers/scsi/fnic/fnic_debugfs.c b/drivers/scsi/fnic/fnic_debugfs.c
index cbcb0121c84d..5767862ae42f 100644
--- a/drivers/scsi/fnic/fnic_debugfs.c
+++ b/drivers/scsi/fnic/fnic_debugfs.c
@@ -1,56 +1,98 @@
-/*
- * Copyright 2012 Cisco Systems, Inc.  All rights reserved.
- *
- * This program is free software; you may redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; version 2 of the License.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
- * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
- * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- */
+// SPDX-License-Identifier: GPL-2.0-only
+// Copyright 2012 Cisco Systems, Inc.  All rights reserved.
 
 #include <linux/module.h>
 #include <linux/errno.h>
 #include <linux/debugfs.h>
+#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;
+static struct dentry *fnic_stats_debugfs_root;
+
+static struct dentry *fnic_fc_trace_debugfs_file;
+static struct dentry *fnic_fc_rdata_trace_debugfs_file;
+static struct dentry *fnic_fc_trace_enable;
+static struct dentry *fnic_fc_trace_clear;
+
+struct fc_trace_flag_type {
+	u8 fc_row_file;
+	u8 fc_normal_file;
+	u8 fnic_trace;
+	u8 fc_trace;
+	u8 fc_clear;
+};
+
+static struct fc_trace_flag_type *fc_trc_flag;
 
 /*
- * fnic_trace_ctrl_open - Open the trace_enable file
- * @inode: The inode pointer.
- * @file: The file pointer to attach the trace enable/disable flag.
+ * fnic_debugfs_init - Initialize debugfs for fnic debug logging
  *
  * Description:
- * This routine opens a debugsfs file trace_enable.
+ * When Debugfs is configured this routine sets up the fnic debugfs
+ * file system. If not already created, this routine will create the
+ * fnic directory and statistics directory for trace buffer and
+ * stats logging.
+ */
+int fnic_debugfs_init(void)
+{
+	fnic_trace_debugfs_root = debugfs_create_dir("fnic", NULL);
+
+	fnic_stats_debugfs_root = debugfs_create_dir("statistics",
+						fnic_trace_debugfs_root);
+
+	/* Allocate memory to structure */
+	fc_trc_flag = vmalloc(sizeof(struct fc_trace_flag_type));
+
+	if (fc_trc_flag) {
+		fc_trc_flag->fc_row_file = 0;
+		fc_trc_flag->fc_normal_file = 1;
+		fc_trc_flag->fnic_trace = 2;
+		fc_trc_flag->fc_trace = 3;
+		fc_trc_flag->fc_clear = 4;
+		return 0;
+	}
+
+	return -ENOMEM;
+}
+
+/*
+ * fnic_debugfs_terminate - Tear down debugfs infrastructure
  *
- * Returns:
- * This function returns zero if successful.
+ * Description:
+ * When Debugfs is configured this routine removes debugfs file system
+ * elements that are specific to fnic.
  */
-static int fnic_trace_ctrl_open(struct inode *inode, struct file *filp)
+void fnic_debugfs_terminate(void)
 {
-	filp->private_data = inode->i_private;
-	return 0;
+	debugfs_remove(fnic_stats_debugfs_root);
+	fnic_stats_debugfs_root = NULL;
+
+	debugfs_remove(fnic_trace_debugfs_root);
+	fnic_trace_debugfs_root = NULL;
+
+	vfree(fc_trc_flag);
 }
 
 /*
- * fnic_trace_ctrl_read - Read a trace_enable debugfs file
+ * fnic_trace_ctrl_read -
+ *          Read  trace_enable ,fc_trace_enable
+ *              or fc_trace_clear debugfs file
  * @filp: The file pointer to read from.
  * @ubuf: The buffer to copy the data to.
  * @cnt: The number of bytes to read.
  * @ppos: The position in the file to start reading from.
  *
  * Description:
- * This routine reads value of variable fnic_tracing_enabled
- * and stores into local @buf. It will start reading file at @ppos and
+ * This routine reads value of variable fnic_tracing_enabled or
+ * fnic_fc_tracing_enabled or fnic_fc_trace_cleared
+ * and stores into local @buf.
+ * It will start reading file at @ppos and
  * copy up to @cnt of data to @ubuf from @buf.
  *
  * Returns:
@@ -62,13 +104,25 @@ static ssize_t fnic_trace_ctrl_read(struct file *filp,
 {
 	char buf[64];
 	int len;
-	len = sprintf(buf, "%u\n", fnic_tracing_enabled);
+	u8 *trace_type;
+	len = 0;
+	trace_type = (u8 *)filp->private_data;
+	if (*trace_type == fc_trc_flag->fnic_trace)
+		len = sprintf(buf, "%d\n", fnic_tracing_enabled);
+	else if (*trace_type == fc_trc_flag->fc_trace)
+		len = sprintf(buf, "%d\n", fnic_fc_tracing_enabled);
+	else if (*trace_type == fc_trc_flag->fc_clear)
+		len = sprintf(buf, "%d\n", fnic_fc_trace_cleared);
+	else
+		pr_err("fnic: Cannot read to any debugfs file\n");
 
 	return simple_read_from_buffer(ubuf, cnt, ppos, buf, len);
 }
 
 /*
- * fnic_trace_ctrl_write - Write to trace_enable debugfs file
+ * fnic_trace_ctrl_write -
+ * Write to trace_enable, fc_trace_enable or
+ *         fc_trace_clear debugfs file
  * @filp: The file pointer to write from.
  * @ubuf: The buffer to copy the data from.
  * @cnt: The number of bytes to write.
@@ -76,7 +130,8 @@ static ssize_t fnic_trace_ctrl_read(struct file *filp,
  *
  * Description:
  * This routine writes data from user buffer @ubuf to buffer @buf and
- * sets fnic_tracing_enabled value as per user input.
+ * sets fc_trace_enable ,tracing_enable or fnic_fc_trace_cleared
+ * value as per user input.
  *
  * Returns:
  * This function returns the amount of data that was written.
@@ -88,6 +143,8 @@ static ssize_t fnic_trace_ctrl_write(struct file *filp,
 	char buf[64];
 	unsigned long val;
 	int ret;
+	u8 *trace_type;
+	trace_type = (u8 *)filp->private_data;
 
 	if (cnt >= sizeof(buf))
 		return -EINVAL;
@@ -101,12 +158,27 @@ static ssize_t fnic_trace_ctrl_write(struct file *filp,
 	if (ret < 0)
 		return ret;
 
-	fnic_tracing_enabled = val;
+	if (*trace_type == fc_trc_flag->fnic_trace)
+		fnic_tracing_enabled = val;
+	else if (*trace_type == fc_trc_flag->fc_trace)
+		fnic_fc_tracing_enabled = val;
+	else if (*trace_type == fc_trc_flag->fc_clear)
+		fnic_fc_trace_cleared = val;
+	else
+		pr_err("fnic: cannot write to any debugfs file\n");
+
 	(*ppos)++;
 
 	return cnt;
 }
 
+static const struct file_operations fnic_trace_ctrl_fops = {
+	.owner = THIS_MODULE,
+	.open = simple_open,
+	.read = fnic_trace_ctrl_read,
+	.write = fnic_trace_ctrl_write,
+};
+
 /*
  * fnic_trace_debugfs_open - Open the fnic trace log
  * @inode: The inode pointer
@@ -126,19 +198,33 @@ static int fnic_trace_debugfs_open(struct inode *inode,
 				  struct file *file)
 {
 	fnic_dbgfs_t *fnic_dbg_prt;
+	u8 *rdata_ptr;
+	rdata_ptr = (u8 *)inode->i_private;
 	fnic_dbg_prt = kzalloc(sizeof(fnic_dbgfs_t), GFP_KERNEL);
 	if (!fnic_dbg_prt)
 		return -ENOMEM;
 
-	fnic_dbg_prt->buffer = vmalloc((3*(trace_max_pages * PAGE_SIZE)));
-	if (!fnic_dbg_prt->buffer) {
-		kfree(fnic_dbg_prt);
-		return -ENOMEM;
+	if (*rdata_ptr == fc_trc_flag->fnic_trace) {
+		fnic_dbg_prt->buffer = vzalloc(array3_size(3, trace_max_pages,
+							   PAGE_SIZE));
+		if (!fnic_dbg_prt->buffer) {
+			kfree(fnic_dbg_prt);
+			return -ENOMEM;
+		}
+		fnic_dbg_prt->buffer_len = fnic_get_trace_data(fnic_dbg_prt);
+	} else {
+		fnic_dbg_prt->buffer =
+			vzalloc(array3_size(3, fnic_fc_trace_max_pages,
+					    PAGE_SIZE));
+		if (!fnic_dbg_prt->buffer) {
+			kfree(fnic_dbg_prt);
+			return -ENOMEM;
+		}
+		fnic_dbg_prt->buffer_len =
+			fnic_fc_trace_get_data(fnic_dbg_prt, *rdata_ptr);
 	}
-	memset((void *)fnic_dbg_prt->buffer, 0,
-			  (3*(trace_max_pages * PAGE_SIZE)));
-	fnic_dbg_prt->buffer_len = fnic_get_trace_data(fnic_dbg_prt);
 	file->private_data = fnic_dbg_prt;
+
 	return 0;
 }
 
@@ -220,13 +306,6 @@ static int fnic_trace_debugfs_release(struct inode *inode,
 	return 0;
 }
 
-static const struct file_operations fnic_trace_ctrl_fops = {
-	.owner = THIS_MODULE,
-	.open = fnic_trace_ctrl_open,
-	.read = fnic_trace_ctrl_read,
-	.write = fnic_trace_ctrl_write,
-};
-
 static const struct file_operations fnic_trace_debugfs_fops = {
 	.owner = THIS_MODULE,
 	.open = fnic_trace_debugfs_open,
@@ -241,41 +320,23 @@ static const struct file_operations fnic_trace_debugfs_fops = {
  * Description:
  * When Debugfs is configured this routine sets up the fnic debugfs
  * file system. If not already created, this routine will create the
- * fnic directory. It will create file trace to log fnic trace buffer
- * output into debugfs and it will also create file trace_enable to
- * control enable/disable of trace logging into trace buffer.
+ * create file trace to log fnic trace buffer output into debugfs and
+ * it will also create file trace_enable to control enable/disable of
+ * trace logging into trace buffer.
  */
-int fnic_trace_debugfs_init(void)
+void fnic_trace_debugfs_init(void)
 {
-	int rc = -1;
-	fnic_trace_debugfs_root = debugfs_create_dir("fnic", NULL);
-	if (!fnic_trace_debugfs_root) {
-		printk(KERN_DEBUG "Cannot create debugfs root\n");
-		return rc;
-	}
 	fnic_trace_enable = debugfs_create_file("tracing_enable",
-					  S_IFREG|S_IRUGO|S_IWUSR,
-					  fnic_trace_debugfs_root,
-					  NULL, &fnic_trace_ctrl_fops);
-
-	if (!fnic_trace_enable) {
-		printk(KERN_DEBUG "Cannot create trace_enable file"
-				  " under debugfs");
-		return rc;
-	}
+					S_IFREG|S_IRUGO|S_IWUSR,
+					fnic_trace_debugfs_root,
+					&(fc_trc_flag->fnic_trace),
+					&fnic_trace_ctrl_fops);
 
 	fnic_trace_debugfs_file = debugfs_create_file("trace",
-						  S_IFREG|S_IRUGO|S_IWUSR,
-						  fnic_trace_debugfs_root,
-						  NULL,
-						  &fnic_trace_debugfs_fops);
-
-	if (!fnic_trace_debugfs_file) {
-		printk(KERN_DEBUG "Cannot create trace file under debugfs");
-		return rc;
-	}
-	rc = 0;
-	return rc;
+					S_IFREG|S_IRUGO|S_IWUSR,
+					fnic_trace_debugfs_root,
+					&(fc_trc_flag->fnic_trace),
+					&fnic_trace_debugfs_fops);
 }
 
 /*
@@ -287,16 +348,374 @@ int fnic_trace_debugfs_init(void)
  */
 void fnic_trace_debugfs_terminate(void)
 {
-	if (fnic_trace_debugfs_file) {
-		debugfs_remove(fnic_trace_debugfs_file);
-		fnic_trace_debugfs_file = NULL;
-	}
-	if (fnic_trace_enable) {
-		debugfs_remove(fnic_trace_enable);
-		fnic_trace_enable = NULL;
+	debugfs_remove(fnic_trace_debugfs_file);
+	fnic_trace_debugfs_file = NULL;
+
+	debugfs_remove(fnic_trace_enable);
+	fnic_trace_enable = NULL;
+}
+
+/*
+ * fnic_fc_trace_debugfs_init -
+ * Initialize debugfs for fnic control frame trace logging
+ *
+ * Description:
+ * When Debugfs is configured this routine sets up the fnic_fc debugfs
+ * file system. If not already created, this routine will create the
+ * create file trace to log fnic fc trace buffer output into debugfs and
+ * it will also create file fc_trace_enable to control enable/disable of
+ * trace logging into trace buffer.
+ */
+
+void fnic_fc_trace_debugfs_init(void)
+{
+	fnic_fc_trace_enable = debugfs_create_file("fc_trace_enable",
+					S_IFREG|S_IRUGO|S_IWUSR,
+					fnic_trace_debugfs_root,
+					&(fc_trc_flag->fc_trace),
+					&fnic_trace_ctrl_fops);
+
+	fnic_fc_trace_clear = debugfs_create_file("fc_trace_clear",
+					S_IFREG|S_IRUGO|S_IWUSR,
+					fnic_trace_debugfs_root,
+					&(fc_trc_flag->fc_clear),
+					&fnic_trace_ctrl_fops);
+
+	fnic_fc_rdata_trace_debugfs_file =
+		debugfs_create_file("fc_trace_rdata",
+				    S_IFREG|S_IRUGO|S_IWUSR,
+				    fnic_trace_debugfs_root,
+				    &(fc_trc_flag->fc_normal_file),
+				    &fnic_trace_debugfs_fops);
+
+	fnic_fc_trace_debugfs_file =
+		debugfs_create_file("fc_trace",
+				    S_IFREG|S_IRUGO|S_IWUSR,
+				    fnic_trace_debugfs_root,
+				    &(fc_trc_flag->fc_row_file),
+				    &fnic_trace_debugfs_fops);
+}
+
+/*
+ * fnic_fc_trace_debugfs_terminate - Tear down debugfs infrastructure
+ *
+ * Description:
+ * When Debugfs is configured this routine removes debugfs file system
+ * elements that are specific to fnic_fc trace logging.
+ */
+
+void fnic_fc_trace_debugfs_terminate(void)
+{
+	debugfs_remove(fnic_fc_trace_debugfs_file);
+	fnic_fc_trace_debugfs_file = NULL;
+
+	debugfs_remove(fnic_fc_rdata_trace_debugfs_file);
+	fnic_fc_rdata_trace_debugfs_file = NULL;
+
+	debugfs_remove(fnic_fc_trace_enable);
+	fnic_fc_trace_enable = NULL;
+
+	debugfs_remove(fnic_fc_trace_clear);
+	fnic_fc_trace_clear = NULL;
+}
+
+/*
+ * fnic_reset_stats_open - Open the reset_stats file
+ * @inode: The inode pointer.
+ * @file: The file pointer to attach the stats reset flag.
+ *
+ * Description:
+ * This routine opens a debugsfs file reset_stats and stores i_private data
+ * to debug structure to retrieve later for while performing other
+ * file oprations.
+ *
+ * Returns:
+ * This function returns zero if successful.
+ */
+static int fnic_reset_stats_open(struct inode *inode, struct file *file)
+{
+	struct stats_debug_info *debug;
+
+	debug = kzalloc(sizeof(struct stats_debug_info), GFP_KERNEL);
+	if (!debug)
+		return -ENOMEM;
+
+	debug->i_private = inode->i_private;
+
+	file->private_data = debug;
+
+	return 0;
+}
+
+/*
+ * fnic_reset_stats_read - Read a reset_stats debugfs file
+ * @filp: The file pointer to read from.
+ * @ubuf: The buffer to copy the data to.
+ * @cnt: The number of bytes to read.
+ * @ppos: The position in the file to start reading from.
+ *
+ * Description:
+ * This routine reads value of variable reset_stats
+ * and stores into local @buf. It will start reading file at @ppos and
+ * copy up to @cnt of data to @ubuf from @buf.
+ *
+ * Returns:
+ * This function returns the amount of data that was read.
+ */
+static ssize_t fnic_reset_stats_read(struct file *file,
+					char __user *ubuf,
+					size_t cnt, loff_t *ppos)
+{
+	struct stats_debug_info *debug = file->private_data;
+	struct fnic *fnic = (struct fnic *)debug->i_private;
+	char buf[64];
+	int len;
+
+	len = sprintf(buf, "%u\n", fnic->reset_stats);
+
+	return simple_read_from_buffer(ubuf, cnt, ppos, buf, len);
+}
+
+/*
+ * fnic_reset_stats_write - Write to reset_stats debugfs file
+ * @filp: The file pointer to write from.
+ * @ubuf: The buffer to copy the data from.
+ * @cnt: The number of bytes to write.
+ * @ppos: The position in the file to start writing to.
+ *
+ * Description:
+ * This routine writes data from user buffer @ubuf to buffer @buf and
+ * resets cumulative stats of fnic.
+ *
+ * Returns:
+ * This function returns the amount of data that was written.
+ */
+static ssize_t fnic_reset_stats_write(struct file *file,
+					const char __user *ubuf,
+					size_t cnt, loff_t *ppos)
+{
+	struct stats_debug_info *debug = file->private_data;
+	struct fnic *fnic = (struct fnic *)debug->i_private;
+	struct fnic_stats *stats = &fnic->fnic_stats;
+	u64 *io_stats_p = (u64 *)&stats->io_stats;
+	u64 *fw_stats_p = (u64 *)&stats->fw_stats;
+	char buf[64];
+	unsigned long val;
+	int ret;
+
+	if (cnt >= sizeof(buf))
+		return -EINVAL;
+
+	if (copy_from_user(&buf, ubuf, cnt))
+		return -EFAULT;
+
+	buf[cnt] = 0;
+
+	ret = kstrtoul(buf, 10, &val);
+	if (ret < 0)
+		return ret;
+
+	fnic->reset_stats = val;
+
+	if (fnic->reset_stats) {
+		/* Skip variable is used to avoid descrepancies to Num IOs
+		 * and IO Completions stats. Skip incrementing No IO Compls
+		 * for pending active IOs after reset stats
+		 */
+		atomic64_set(&fnic->io_cmpl_skip,
+			atomic64_read(&stats->io_stats.active_ios));
+		memset(&stats->abts_stats, 0, sizeof(struct abort_stats));
+		memset(&stats->term_stats, 0,
+			sizeof(struct terminate_stats));
+		memset(&stats->reset_stats, 0, sizeof(struct reset_stats));
+		memset(&stats->misc_stats, 0, sizeof(struct misc_stats));
+		memset(&stats->vlan_stats, 0, sizeof(struct vlan_stats));
+		memset(io_stats_p+1, 0,
+			sizeof(struct io_path_stats) - sizeof(u64));
+		memset(fw_stats_p+1, 0,
+			sizeof(struct fw_stats) - sizeof(u64));
+		ktime_get_real_ts64(&stats->stats_timestamps.last_reset_time);
 	}
-	if (fnic_trace_debugfs_root) {
-		debugfs_remove(fnic_trace_debugfs_root);
-		fnic_trace_debugfs_root = NULL;
+
+	(*ppos)++;
+	return cnt;
+}
+
+/*
+ * fnic_reset_stats_release - Release the buffer used to store
+ * debugfs file data
+ * @inode: The inode pointer
+ * @file: The file pointer that contains the buffer to release
+ *
+ * Description:
+ * This routine frees the buffer that was allocated when the debugfs
+ * file was opened.
+ *
+ * Returns:
+ * This function returns zero.
+ */
+static int fnic_reset_stats_release(struct inode *inode,
+					struct file *file)
+{
+	struct stats_debug_info *debug = file->private_data;
+	kfree(debug);
+	return 0;
+}
+
+/*
+ * fnic_stats_debugfs_open - Open the stats file for specific host
+ * and get fnic stats.
+ * @inode: The inode pointer.
+ * @file: The file pointer to attach the specific host statistics.
+ *
+ * Description:
+ * This routine opens a debugsfs file stats of specific host and print
+ * fnic stats.
+ *
+ * Returns:
+ * This function returns zero if successful.
+ */
+static int fnic_stats_debugfs_open(struct inode *inode,
+					struct file *file)
+{
+	struct fnic *fnic = inode->i_private;
+	struct fnic_stats *fnic_stats = &fnic->fnic_stats;
+	struct stats_debug_info *debug;
+	int buf_size = 2 * PAGE_SIZE;
+
+	debug = kzalloc(sizeof(struct stats_debug_info), GFP_KERNEL);
+	if (!debug)
+		return -ENOMEM;
+
+	debug->debug_buffer = vmalloc(buf_size);
+	if (!debug->debug_buffer) {
+		kfree(debug);
+		return -ENOMEM;
 	}
+
+	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;
+
+	return 0;
+}
+
+/*
+ * fnic_stats_debugfs_read - Read a debugfs file
+ * @file: The file pointer to read from.
+ * @ubuf: The buffer to copy the data to.
+ * @nbytes: The number of bytes to read.
+ * @pos: The position in the file to start reading from.
+ *
+ * Description:
+ * This routine reads data from the buffer indicated in the private_data
+ * field of @file. It will start reading at @pos and copy up to @nbytes of
+ * data to @ubuf.
+ *
+ * Returns:
+ * This function returns the amount of data that was read (this could be
+ * less than @nbytes if the end of the file was reached).
+ */
+static ssize_t fnic_stats_debugfs_read(struct file *file,
+					char __user *ubuf,
+					size_t nbytes,
+					loff_t *pos)
+{
+	struct stats_debug_info *debug = file->private_data;
+	int rc = 0;
+	rc = simple_read_from_buffer(ubuf, nbytes, pos,
+					debug->debug_buffer,
+					debug->buffer_len);
+	return rc;
+}
+
+/*
+ * fnic_stats_stats_release - Release the buffer used to store
+ * debugfs file data
+ * @inode: The inode pointer
+ * @file: The file pointer that contains the buffer to release
+ *
+ * Description:
+ * This routine frees the buffer that was allocated when the debugfs
+ * file was opened.
+ *
+ * Returns:
+ * This function returns zero.
+ */
+static int fnic_stats_debugfs_release(struct inode *inode,
+					struct file *file)
+{
+	struct stats_debug_info *debug = file->private_data;
+	vfree(debug->debug_buffer);
+	kfree(debug);
+	return 0;
+}
+
+static const struct file_operations fnic_stats_debugfs_fops = {
+	.owner = THIS_MODULE,
+	.open = fnic_stats_debugfs_open,
+	.read = fnic_stats_debugfs_read,
+	.release = fnic_stats_debugfs_release,
+};
+
+static const struct file_operations fnic_reset_debugfs_fops = {
+	.owner = THIS_MODULE,
+	.open = fnic_reset_stats_open,
+	.read = fnic_reset_stats_read,
+	.write = fnic_reset_stats_write,
+	.release = fnic_reset_stats_release,
+};
+
+/*
+ * fnic_stats_init - Initialize stats struct and create stats file per fnic
+ *
+ * Description:
+ * When Debugfs is configured this routine sets up the stats file per fnic
+ * It will create file stats and reset_stats under statistics/host# directory
+ * to log per fnic stats.
+ */
+int fnic_stats_debugfs_init(struct fnic *fnic)
+{
+	char name[16];
+
+	snprintf(name, sizeof(name), "host%d", fnic->host->host_no);
+
+	fnic->fnic_stats_debugfs_host = debugfs_create_dir(name,
+						fnic_stats_debugfs_root);
+	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);
+	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);
+	return 0;
+}
+
+/*
+ * fnic_stats_debugfs_remove - Tear down debugfs infrastructure of stats
+ *
+ * Description:
+ * When Debugfs is configured this routine removes debugfs file system
+ * elements that are specific to fnic stats.
+ */
+void fnic_stats_debugfs_remove(struct fnic *fnic)
+{
+	if (!fnic)
+		return;
+
+	debugfs_remove(fnic->fnic_stats_debugfs_file);
+	fnic->fnic_stats_debugfs_file = NULL;
+
+	debugfs_remove(fnic->fnic_reset_debugfs_file);
+	fnic->fnic_reset_debugfs_file = NULL;
+
+	debugfs_remove(fnic->fnic_stats_debugfs_host);
+	fnic->fnic_stats_debugfs_host = NULL;
 }