i40e_debugfs.rar_family

      /*******************************************************************************
 *
 * Intel Ethernet Controller XL710 Family Linux Driver
 * Copyright(c) 2013 Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * The full GNU General Public License is included in this distribution in
 * the file called "COPYING".
 *
 * Contact Information:
 * e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 ******************************************************************************/

#ifdef CONFIG_DEBUG_FS

#include <linux/fs.h>
#include <linux/debugfs.h>

#include "i40e.h"

static struct dentry *i40e_dbg_root;

/**
 * i40e_dbg_find_vsi - searches for the vsi with the given seid
 * @pf - the pf structure to search for the vsi
 * @seid - seid of the vsi it is searching for
 **/
static struct i40e_vsi *i40e_dbg_find_vsi(struct i40e_pf *pf, int seid)
{
	int i;

	if (seid < 0)
		dev_info(&pf->pdev->dev, "%d: bad seid\n", seid);
	else
		for (i = 0; i < pf->hw.func_caps.num_vsis; i++)
			if (pf->vsi[i] && (pf->vsi[i]->seid == seid))
				return pf->vsi[i];

	return NULL;
}

/**
 * i40e_dbg_find_veb - searches for the veb with the given seid
 * @pf - the pf structure to search for the veb
 * @seid - seid of the veb it is searching for
 **/
static struct i40e_veb *i40e_dbg_find_veb(struct i40e_pf *pf, int seid)
{
	int i;

	if ((seid < I40E_BASE_VEB_SEID) ||
	    (seid > (I40E_BASE_VEB_SEID + I40E_MAX_VEB)))
		dev_info(&pf->pdev->dev, "%d: bad seid\n", seid);
	else
		for (i = 0; i < I40E_MAX_VEB; i++)
			if (pf->veb[i] && pf->veb[i]->seid == seid)
				return pf->veb[i];
	return NULL;
}

/**************************************************************
 * dump
 * The dump entry in debugfs is for getting a data snapshow of
 * the driver's current configuration and runtime details.
 * When the filesystem entry is written, a snapshot is taken.
 * When the entry is read, the most recent snapshot data is dumped.
 **************************************************************/
static char *i40e_dbg_dump_buf;
static ssize_t i40e_dbg_dump_data_len;
static ssize_t i40e_dbg_dump_buffer_len;

/**
 * i40e_dbg_dump_read - read the dump data
 * @filp: the opened file
 * @buffer: where to write the data for the user to read
 * @count: the size of the user's buffer
 * @ppos: file position offset
 **/
static ssize_t i40e_dbg_dump_read(struct file *filp, char __user *buffer,
				  size_t count, loff_t *ppos)
{
	int bytes_not_copied;
	int len;

	/* is *ppos bigger than the available data? */
	if (*ppos >= i40e_dbg_dump_data_len || !i40e_dbg_dump_buf)
		return 0;

	/* be sure to not read beyond the end of available data */
	len = min_t(int, count, (i40e_dbg_dump_data_len - *ppos));

	bytes_not_copied = copy_to_user(buffer, &i40e_dbg_dump_buf[*ppos], len);
	if (bytes_not_copied < 0)
		return bytes_not_copied;

	*ppos += len;
	return len;
}

/**
 * i40e_dbg_prep_dump_buf
 * @pf: the pf we're working with
 * @buflen: the desired buffer length
 *
 * Return positive if success, 0 if failed
 **/
static int i40e_dbg_prep_dump_buf(struct i40e_pf *pf, int buflen)
{
	/* if not already big enough, prep for re alloc */
	if (i40e_dbg_dump_buffer_len && i40e_dbg_dump_buffer_len < buflen) {
		kfree(i40e_dbg_dump_buf);
		i40e_dbg_dump_buffer_len = 0;
		i40e_dbg_dump_buf = NULL;
	}

	/* get a new buffer if needed */
	if (!i40e_dbg_dump_buf) {
		i40e_dbg_dump_buf = kzalloc(buflen, GFP_KERNEL);
		if (i40e_dbg_dump_buf != NULL)
			i40e_dbg_dump_buffer_len = buflen;
	}

	return i40e_dbg_dump_buffer_len;
}

/**
 * i40e_dbg_dump_write - trigger a datadump snapshot
 * @filp: the opened file
 * @buffer: where to find the user's data
 * @count: the length of the user's data
 * @ppos: file position offset
 *
 * Any write clears the stats
 **/
static ssize_t i40e_dbg_dump_write(struct file *filp,
				   const char __user *buffer,
				   size_t count, loff_t *ppos)
{
	struct i40e_pf *pf = filp->private_data;
	bool seid_found = false;
	long seid = -1;
	int buflen = 0;
	int i, ret;
	int len;
	u8 *p;

	/* don't allow partial writes */
	if (*ppos != 0)
		return 0;

	/* decode the SEID given to be dumped */
	ret = kstrtol_from_user(buffer, count, 0, &seid);

	if (ret) {
		dev_info(&pf->pdev->dev, "bad seid value\n");
	} else if (seid == 0) {
		seid_found = true;

		kfree(i40e_dbg_dump_buf);
		i40e_dbg_dump_buffer_len = 0;
		i40e_dbg_dump_data_len = 0;
		i40e_dbg_dump_buf = NULL;
		dev_info(&pf->pdev->dev, "debug buffer freed\n");

	} else if (seid == pf->pf_seid || seid == 1) {
		seid_found = true;

		buflen = sizeof(struct i40e_pf);
		buflen += (sizeof(struct i40e_aq_desc)
		     * (pf->hw.aq.num_arq_entries + pf->hw.aq.num_asq_entries));

		if (i40e_dbg_prep_dump_buf(pf, buflen)) {
			p = i40e_dbg_dump_buf;

			len = sizeof(struct i40e_pf);
			memcpy(p, pf, len);
			p += len;

			len = (sizeof(struct i40e_aq_desc)
					* pf->hw.aq.num_asq_entries);
			memcpy(p, pf->hw.aq.asq.desc, len);
			p += len;

			len = (sizeof(struct i40e_aq_desc)
					* pf->hw.aq.num_arq_entries);
			memcpy(p, pf->hw.aq.arq.desc, len);
			p += len;

			i40e_dbg_dump_data_len = buflen;
			dev_info(&pf->pdev->dev,
				 "PF seid %ld dumped %d bytes\n",
				 seid, (int)i40e_dbg_dump_data_len);
		}
	} else if (seid >= I40E_BASE_VSI_SEID) {
		struct i40e_vsi *vsi = NULL;
		struct i40e_mac_filter *f;
		int filter_count = 0;

		mutex_lock(&pf->switch_mutex);
		vsi = i40e_dbg_find_vsi(pf, seid);
		if (!vsi) {
			mutex_unlock(&pf->switch_mutex);
			goto write_exit;
		}

		buflen = sizeof(struct i40e_vsi);
		buflen += sizeof(struct i40e_q_vector) * vsi->num_q_vectors;
		buflen += sizeof(struct i40e_ring) * 2 * vsi->num_queue_pairs;
		buflen += sizeof(struct i40e_tx_buffer) * vsi->num_queue_pairs;
		buflen += sizeof(struct i40e_rx_buffer) * vsi->num_queue_pairs;
		list_for_each_entry(f, &vsi->mac_filter_list, list)
			filter_count++;
		buflen += sizeof(struct i40e_mac_filter) * filter_count;

		if (i40e_dbg_prep_dump_buf(pf, buflen)) {
			p = i40e_dbg_dump_buf;
			seid_found = true;

			len = sizeof(struct i40e_vsi);
			memcpy(p, vsi, len);
			p += len;

			if (vsi->num_q_vectors) {
				len = (sizeof(struct i40e_q_vector)
					* vsi->num_q_vectors);
				memcpy(p, vsi->q_vectors, len);
				p += len;
			}

			if (vsi->num_queue_pairs) {
				len = (sizeof(struct i40e_ring) *
				      vsi->num_queue_pairs);
				memcpy(p, vsi->tx_rings, len);
				p += len;
				memcpy(p, vsi->rx_rings, len);
				p += len;
			}

			if (vsi->tx_rings[0]) {
				len = sizeof(struct i40e_tx_buffer);
				for (i = 0; i < vsi->num_queue_pairs; i++) {
					memcpy(p, vsi->tx_rings[i]->tx_bi, len);
					p += len;
				}
				len = sizeof(struct i40e_rx_buffer);
				for (i = 0; i < vsi->num_queue_pairs; i++) {
					memcpy(p, vsi->rx_rings[i]->rx_bi, len);
					p += len;
				}
			}

			/* macvlan filter list */
			len = sizeof(struct i40e_mac_filter);
			list_for_each_entry(f, &vsi->mac_filter_list, list) {
				memcpy(p, f, len);
				p += len;
			}

			i40e_dbg_dump_data_len = buflen;
			dev_info(&pf->pdev->dev,
				 "VSI seid %ld dumped %d bytes\n",
				 seid, (int)i40e_dbg_dump_data_len);
		}
		mutex_unlock(&pf->switch_mutex);
	} else if (seid >= I40E_BASE_VEB_SEID) {
		struct i40e_veb *veb = NULL;

		mutex_lock(&pf->switch_mutex);
		veb = i40e_dbg_find_veb(pf, seid);
		if (!veb) {