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git://nv-tegra.nvidia.com/linux-nv-oot.git
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3fa01bcd71
When MAC HW loopback is enabled, MAC receives back all the packets that is being sent by it. Packets which were sent are looped inside the MAC itself. Bug 200512681 Change-Id: Ifb29dcdbfbf2c1b3baab438bf5b98c0fb362e6d8 Signed-off-by: Narayan Reddy <narayanr@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/2088984 Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com> Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
151 lines
4.1 KiB
C
151 lines
4.1 KiB
C
/*
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* Copyright (c) 2019, NVIDIA CORPORATION. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "ether_linux.h"
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/**
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* ether_mac_loopback_show - Shows the current setting of MAC loopback
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* @dev: Device data.
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* @attr: Device attribute
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* @buf: Buffer to store the current MAC loopback setting
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*
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* Algorithm: Display the current MAC loopback setting.
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*
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* Dependencies: MAC and PHY need to be initialized.
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*
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* Protection: None.
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*
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* Return: None.
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*/
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static ssize_t ether_mac_loopback_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct net_device *ndev = (struct net_device *)dev_get_drvdata(dev);
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struct ether_priv_data *pdata = netdev_priv(ndev);
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return sprintf(buf, "%s\n", (pdata->mac_loopback_mode == 1) ?
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"enabled" : "disabled");
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}
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/**
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* ether_mac_loopback_store - Set the user setting of MAC loopback mode
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* @dev: Device data.
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* @attr: Device attribute
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* @buf: Buffer which contains the user settings of MAC loopback
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* @size: size of buffer
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*
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* Algorithm: This is used to set the user mode settings of MAC loopback.
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*
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* Dependencies: MAC and PHY need to be initialized.
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*
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* Protection: None.
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*
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* Return: size of buffer.
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*/
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static ssize_t ether_mac_loopback_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t size)
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{
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struct net_device *ndev = (struct net_device *)dev_get_drvdata(dev);
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struct ether_priv_data *pdata = netdev_priv(ndev);
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int ret = -1;
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/* Interface is not up so LB mode can't be set */
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if (!netif_running(ndev)) {
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dev_err(pdata->dev, "Not Allowed. Ether interface is not up\n");
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return size;
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}
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if (strncmp(buf, "enable", 6) == 0U) {
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netif_carrier_on(ndev);
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/* Enabling the MAC Loopback Mode */
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ret = osi_config_mac_loopback(pdata->osi_core, OSI_ENABLE);
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if (ret < 0) {
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dev_err(pdata->dev, "Enabling MAC Loopback failed\n");
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} else {
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pdata->mac_loopback_mode = 1;
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dev_info(pdata->dev, "Enabling MAC Loopback\n");
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}
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} else if (strncmp(buf, "disable", 7) == 0U) {
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netif_carrier_off(ndev);
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/* Disabling the MAC Loopback Mode */
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ret = osi_config_mac_loopback(pdata->osi_core, OSI_DISABLE);
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if (ret < 0) {
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dev_err(pdata->dev, "Disabling MAC Loopback failed\n");
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} else {
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pdata->mac_loopback_mode = 0;
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dev_info(pdata->dev, "Disabling MAC Loopback\n");
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}
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} else {
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dev_err(pdata->dev,
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"Invalid entry. Valid Entries are enable or disable\n");
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}
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return size;
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}
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static DEVICE_ATTR(mac_loopback, (S_IRUGO | S_IWUSR),
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ether_mac_loopback_show,
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ether_mac_loopback_store);
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static struct attribute *ether_sysfs_attrs[] = {
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&dev_attr_mac_loopback.attr,
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NULL
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};
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static struct attribute_group ether_attribute_group = {
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.name = "nvethernet",
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.attrs = ether_sysfs_attrs,
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};
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/**
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* ether_sysfs_register - Creates nvethernet sysfs group
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* @dev: Net device data.
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*
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* Algorithm: Creates the sysfs group.
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*
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* Dependencies: MAC and PHY need to be initialized.
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*
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* Protection: None.
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*
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* Return: 0 - success, negative value - failure.
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*/
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int ether_sysfs_register(struct device *dev)
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{
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/* Create nvethernet sysfs group under /sys/devices/<ether_device>/ */
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return sysfs_create_group(&dev->kobj, ðer_attribute_group);
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}
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/**
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* ether_sysfs_unregister - Removes nvethernet sysfs group
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* @dev: Net device data.
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*
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* Algorithm: Removes the sysfs group.
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*
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* Dependencies: nvethernet sysfs group need to be registered during probe.
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*
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* Protection: None.
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*
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* Return: None.
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*/
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void ether_sysfs_unregister(struct device *dev)
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{
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/* Remove nvethernet sysfs group under /sys/devices/<ether_device>/ */
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sysfs_remove_group(&dev->kobj, ðer_attribute_group);
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}
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