--- /dev/null
+/*
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/debugfs.h>
+#include "fnic.h"
+
+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_debugfs_init - Initialize debugfs for fnic debug logging
+ *
+ * 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 and statistics directory for trace buffer and
+ * stats logging.
+ */
+int fnic_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;
+ }
+
+ if (!fnic_trace_debugfs_root) {
+ printk(KERN_DEBUG
+ "fnic root directory doesn't exist in debugfs\n");
+ return rc;
+ }
+
+ fnic_stats_debugfs_root = debugfs_create_dir("statistics",
+ fnic_trace_debugfs_root);
+ if (!fnic_stats_debugfs_root) {
+ printk(KERN_DEBUG "Cannot create Statistics directory\n");
+ return rc;
+ }
+
+ /* Allocate memory to structure */
+ fc_trc_flag = (struct fc_trace_flag_type *)
+ 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;
+ }
+
+ rc = 0;
+ return rc;
+}
+
+/*
+ * fnic_debugfs_terminate - Tear down debugfs infrastructure
+ *
+ * Description:
+ * When Debugfs is configured this routine removes debugfs file system
+ * elements that are specific to fnic.
+ */
+void fnic_debugfs_terminate(void)
+{
+ debugfs_remove(fnic_stats_debugfs_root);
+ fnic_stats_debugfs_root = NULL;
+
+ debugfs_remove(fnic_trace_debugfs_root);
+ fnic_trace_debugfs_root = NULL;
+
+ if (fc_trc_flag)
+ vfree(fc_trc_flag);
+}
+
+/*
+ * fnic_trace_ctrl_open - Open the trace_enable file for fnic_trace
+ * Or Open fc_trace_enable file for fc_trace
+ * @inode: The inode pointer.
+ * @file: The file pointer to attach the trace enable/disable flag.
+ *
+ * Description:
+ * This routine opens a debugsfs file trace_enable or fc_trace_enable.
+ *
+ * Returns:
+ * This function returns zero if successful.
+ */
+static int fnic_trace_ctrl_open(struct inode *inode, struct file *filp)
+{
+ filp->private_data = inode->i_private;
+ return 0;
+}
+
+/*
+ * 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 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:
+ * This function returns the amount of data that was read.
+ */
+static ssize_t fnic_trace_ctrl_read(struct file *filp,
+ char __user *ubuf,
+ size_t cnt, loff_t *ppos)
+{
+ char buf[64];
+ int len;
+ u8 *trace_type;
+ len = 0;
+ trace_type = (u8 *)filp->private_data;
+ if (*trace_type == fc_trc_flag->fnic_trace)
+ len = sprintf(buf, "%u\n", fnic_tracing_enabled);
+ else if (*trace_type == fc_trc_flag->fc_trace)
+ len = sprintf(buf, "%u\n", fnic_fc_tracing_enabled);
+ else if (*trace_type == fc_trc_flag->fc_clear)
+ len = sprintf(buf, "%u\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, 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.
+ * @ppos: The position in the file to start writing to.
+ *
+ * Description:
+ * This routine writes data from user buffer @ubuf to buffer @buf and
+ * 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.
+ */
+static ssize_t fnic_trace_ctrl_write(struct file *filp,
+ const char __user *ubuf,
+ size_t cnt, loff_t *ppos)
+{
+ char buf[64];
+ unsigned long val;
+ int ret;
+ u8 *trace_type;
+ trace_type = (u8 *)filp->private_data;
+
+ 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;
+
+ 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 = fnic_trace_ctrl_open,
+ .read = fnic_trace_ctrl_read,
+ .write = fnic_trace_ctrl_write,
+};
+
+/*
+ * fnic_trace_debugfs_open - Open the fnic trace log
+ * @inode: The inode pointer
+ * @file: The file pointer to attach the log output
+ *
+ * Description:
+ * This routine is the entry point for the debugfs open file operation.
+ * It allocates the necessary buffer for the log, fills the buffer from
+ * the in-memory log and then returns a pointer to that log in
+ * the private_data field in @file.
+ *
+ * Returns:
+ * This function returns zero if successful. On error it will return
+ * a negative error value.
+ */
+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;
+
+ if (*rdata_ptr == fc_trc_flag->fnic_trace) {
+ fnic_dbg_prt->buffer = vmalloc(3 *
+ (trace_max_pages * PAGE_SIZE));
+ if (!fnic_dbg_prt->buffer) {
+ kfree(fnic_dbg_prt);
+ return -ENOMEM;
+ }
+ 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);
+ } else {
+ fnic_dbg_prt->buffer =
+ vmalloc(3 * (fnic_fc_trace_max_pages * PAGE_SIZE));
+ if (!fnic_dbg_prt->buffer) {
+ kfree(fnic_dbg_prt);
+ return -ENOMEM;
+ }
+ memset((void *)fnic_dbg_prt->buffer, 0,
+ 3 * (fnic_fc_trace_max_pages * PAGE_SIZE));
+ fnic_dbg_prt->buffer_len =
+ fnic_fc_trace_get_data(fnic_dbg_prt, *rdata_ptr);
+ }
+ file->private_data = fnic_dbg_prt;
+
+ return 0;
+}
+
+/*
+ * fnic_trace_debugfs_lseek - Seek through a debugfs file
+ * @file: The file pointer to seek through.
+ * @offset: The offset to seek to or the amount to seek by.
+ * @howto: Indicates how to seek.
+ *
+ * Description:
+ * This routine is the entry point for the debugfs lseek file operation.
+ * The @howto parameter indicates whether @offset is the offset to directly
+ * seek to, or if it is a value to seek forward or reverse by. This function
+ * figures out what the new offset of the debugfs file will be and assigns
+ * that value to the f_pos field of @file.
+ *
+ * Returns:
+ * This function returns the new offset if successful and returns a negative
+ * error if unable to process the seek.
+ */
+static loff_t fnic_trace_debugfs_lseek(struct file *file,
+ loff_t offset,
+ int howto)
+{
+ fnic_dbgfs_t *fnic_dbg_prt = file->private_data;
+ return fixed_size_llseek(file, offset, howto,
+ fnic_dbg_prt->buffer_len);
+}
+
+/*
+ * fnic_trace_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_trace_debugfs_read(struct file *file,
+ char __user *ubuf,
+ size_t nbytes,
+ loff_t *pos)
+{
+ fnic_dbgfs_t *fnic_dbg_prt = file->private_data;
+ int rc = 0;
+ rc = simple_read_from_buffer(ubuf, nbytes, pos,
+ fnic_dbg_prt->buffer,
+ fnic_dbg_prt->buffer_len);
+ return rc;
+}
+
+/*
+ * fnic_trace_debugfs_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_trace_debugfs_release(struct inode *inode,
+ struct file *file)
+{
+ fnic_dbgfs_t *fnic_dbg_prt = file->private_data;
+
+ vfree(fnic_dbg_prt->buffer);
+ kfree(fnic_dbg_prt);
+ return 0;
+}
+
+static const struct file_operations fnic_trace_debugfs_fops = {
+ .owner = THIS_MODULE,
+ .open = fnic_trace_debugfs_open,
+ .llseek = fnic_trace_debugfs_lseek,
+ .read = fnic_trace_debugfs_read,
+ .release = fnic_trace_debugfs_release,
+};
+
+/*
+ * fnic_trace_debugfs_init - Initialize debugfs for fnic trace logging
+ *
+ * Description:
+ * When Debugfs is configured this routine sets up the fnic debugfs
+ * file system. If not already created, this routine will create the
+ * 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)
+{
+ int rc = -1;
+ if (!fnic_trace_debugfs_root) {
+ printk(KERN_DEBUG
+ "FNIC Debugfs root directory doesn't exist\n");
+ return rc;
+ }
+ fnic_trace_enable = debugfs_create_file("tracing_enable",
+ S_IFREG|S_IRUGO|S_IWUSR,
+ fnic_trace_debugfs_root,
+ &(fc_trc_flag->fnic_trace),
+ &fnic_trace_ctrl_fops);
+
+ if (!fnic_trace_enable) {
+ printk(KERN_DEBUG
+ "Cannot create trace_enable file under debugfs\n");
+ return rc;
+ }
+
+ fnic_trace_debugfs_file = debugfs_create_file("trace",
+ S_IFREG|S_IRUGO|S_IWUSR,
+ fnic_trace_debugfs_root,
+ &(fc_trc_flag->fnic_trace),
+ &fnic_trace_debugfs_fops);
+
+ if (!fnic_trace_debugfs_file) {
+ printk(KERN_DEBUG
+ "Cannot create trace file under debugfs\n");
+ return rc;
+ }
+ rc = 0;
+ return rc;
+}
+
+/*
+ * fnic_trace_debugfs_terminate - Tear down debugfs infrastructure
+ *
+ * Description:
+ * When Debugfs is configured this routine removes debugfs file system
+ * elements that are specific to fnic trace logging.
+ */
+void fnic_trace_debugfs_terminate(void)
+{
+ 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.
+ */
+
+int fnic_fc_trace_debugfs_init(void)
+{
+ int rc = -1;
+
+ if (!fnic_trace_debugfs_root) {
+ pr_err("fnic:Debugfs root directory doesn't exist\n");
+ return rc;
+ }
+
+ 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);
+
+ if (!fnic_fc_trace_enable) {
+ pr_err("fnic: Failed create fc_trace_enable file\n");
+ return rc;
+ }
+
+ 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);
+
+ if (!fnic_fc_trace_clear) {
+ pr_err("fnic: Failed to create fc_trace_enable file\n");
+ return rc;
+ }
+
+ 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);
+
+ if (!fnic_fc_rdata_trace_debugfs_file) {
+ pr_err("fnic: Failed create fc_rdata_trace file\n");
+ return rc;
+ }
+
+ 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);
+
+ if (!fnic_fc_trace_debugfs_file) {
+ pr_err("fnic: Failed to create fc_trace file\n");
+ return rc;
+ }
+ rc = 0;
+ return rc;
+}
+
+/*
+ * 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));
+ }
+
+ (*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);
+
+ 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)
+{
+ int rc = -1;
+ char name[16];
+
+ snprintf(name, sizeof(name), "host%d", fnic->lport->host->host_no);
+
+ if (!fnic_stats_debugfs_root) {
+ printk(KERN_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) {
+ printk(KERN_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) {
+ printk(KERN_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) {
+ printk(KERN_DEBUG "Cannot create host stats file\n");
+ return rc;
+ }
+ rc = 0;
+ return rc;
+}
+
+/*
+ * 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;
+}
Code Review / kvmfornfv.git / blobdiff