@@ -338,4 +338,14 @@ config VMXNET3
To compile this driver as a module, choose M here: the
module will be called vmxnet3.
+config NWHW_CONFIG
+ bool "Configure network hardware from the command line"
+ help
+ Many network drivers support hardware level configuration via
+ utilities such as ifconfig, ethtool and mii-tool. However sometimes
+ these settings need to be adjusted before a file system is
+ available (typically if the root file system uses NFS).
+ This option adds a simple kernel command line interface to configure
+ some common network parameters.
+
endif # NETDEVICES
@@ -66,3 +66,4 @@ obj-$(CONFIG_USB_USBNET) += usb/
obj-$(CONFIG_USB_ZD1201) += usb/
obj-$(CONFIG_USB_IPHETH) += usb/
obj-$(CONFIG_USB_CDC_PHONET) += usb/
+obj-$(CONFIG_NWHW_CONFIG) += nwhwconfig.o
new file mode 100644
@@ -0,0 +1,173 @@
+/*
+ * Configuration of network device hardware from the kernel command line.
+ *
+ * Official documentation available at:
+ * http://www.stlinux.com/howto/network/ethernet-MAC
+ *
+ * Copyright (c) STMicroelectronics Limited
+ *
+ * Author: Stuart Menefy <stuart.menefy@st.com>
+ * Author: Giuseppe Cavallaro <peppe.cavallaro@st.com>
+ */
+
+#include <linux/string.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/ethtool.h>
+#include <linux/etherdevice.h>
+#include <net/ip.h>
+
+static struct eth_dev {
+ char dev_name[IFNAMSIZ];
+ char hw_addr[18];
+ int speed;
+ int duplex;
+} nwhwdev[NETDEV_BOOT_SETUP_MAX];
+
+static int parse_addr(char *str, struct sockaddr *addr)
+{
+ char *s;
+ char *mac = addr->sa_data;
+
+ while ((s = strsep(&str, ":")) != NULL) {
+ unsigned byte;
+ if (sscanf(s, "%x", &byte) != 1 || byte > 0xff)
+ return -1;
+ *mac++ = byte;
+ }
+ addr->sa_family = ARPHRD_ETHER;
+ return 0;
+}
+
+/**
+ * nwhw_config
+ * @dev : net device pointer
+ * Description: it sets the MAC address.
+ * Note that if the network device driver already uses a right
+ * address this function doesn't replace any value.
+ */
+static int __init nwhw_config(void)
+{
+ struct net_device *dev;
+ struct sockaddr s_addr;
+ int ndev = 0;
+
+ while ((ndev < NETDEV_BOOT_SETUP_MAX) &&
+ (dev = __dev_get_by_name(&init_net, nwhwdev[ndev].dev_name))) {
+
+ if (!dev)
+ break;
+
+ if (!is_valid_ether_addr(dev->dev_addr)) {
+
+ if (nwhwdev[ndev].hw_addr[0]) {
+ int valid_ether =
+ parse_addr(nwhwdev[ndev].hw_addr, &s_addr);
+ if (!valid_ether) {
+ rtnl_lock();
+ if (dev_set_mac_address(dev, &s_addr))
+ pr_err("%s: Error: not set MAC"
+ " addr", __func__);
+ rtnl_unlock();
+ goto hw_mac_done;
+ } else
+ pr_err("%s: Error: Invalid MAC addr",
+ __func__);
+ }
+ /* Although many drivers do that in case of
+ * problems, we assume the nwhw_config always
+ * has to exit with a good MAC address (even if
+ * generated randomly). */
+ random_ether_addr(dev->dev_addr);
+ pr_warning("%s: generating random addr...", __func__);
+ }
+hw_mac_done:
+ pr_info("%s: (%s) setting mac address: %pM", __func__,
+ dev->name, dev->dev_addr);
+
+ if ((nwhwdev[ndev].speed != -1) ||
+ (nwhwdev[ndev].duplex != -1)) {
+ struct ethtool_cmd cmd = { ETHTOOL_GSET };
+
+ if (!dev->ethtool_ops->get_settings ||
+ (dev->ethtool_ops->get_settings(dev, &cmd) < 0))
+ pr_err("%s: cannot read ether device settings",
+ __func__);
+ else {
+ cmd.cmd = ETHTOOL_SSET;
+ cmd.autoneg = AUTONEG_DISABLE;
+ if (nwhwdev[ndev].speed != -1)
+ cmd.speed = nwhwdev[ndev].speed;
+ if (nwhwdev[ndev].duplex != -1)
+ cmd.duplex = nwhwdev[ndev].duplex;
+ if (!dev->ethtool_ops->set_settings ||
+ (dev->ethtool_ops->set_settings(dev, &cmd) <
+ 0))
+ pr_err("%s: cannot setting the eth dev",
+ __func__);
+ }
+ }
+ ndev++;
+ }
+ return 0;
+}
+
+device_initcall(nwhw_config);
+
+/**
+ * nwhw_config_setup - parse the nwhwconfig parameters
+ * @str : pointer to the nwhwconfig parameter
+ * Description:
+ * This function parses the nwhwconfig command line argumets.
+ * Command line syntax:
+ * nwhwconf=device:eth0,hwaddr:<mac0>[,speed:<speed0>][,duplex:<duplex0>];
+ * device:eth1,hwaddr:<mac1>[,speed:<speed1>][,duplex:<duplex1>];
+ * ...
+ */
+static int __init nwhw_config_setup(char *str)
+{
+ char *opt;
+ int j = 0;
+
+ if (!str || !*str)
+ return 0;
+
+ while (((opt = strsep(&str, ";")) != NULL)
+ && (j < NETDEV_BOOT_SETUP_MAX)) {
+ char *p;
+
+ nwhwdev[j].speed = -1;
+ nwhwdev[j].duplex = -1;
+
+ while ((p = strsep(&opt, ",")) != NULL) {
+ if (!strncmp(p, "device:", 7))
+ strlcpy(nwhwdev[j].dev_name, p + 7,
+ sizeof(nwhwdev[j].dev_name));
+ else if (!strncmp(p, "hwaddr:", 7))
+ strlcpy(nwhwdev[j].hw_addr, p + 7,
+ sizeof(nwhwdev[j].hw_addr));
+ else if (!strcmp(p, "duplex:full"))
+ nwhwdev[j].duplex = DUPLEX_FULL;
+
+ else if (!strcmp(p, "duplex:half"))
+ nwhwdev[j].duplex = DUPLEX_HALF;
+
+ else if (!strncmp(p, "speed:", 6)) {
+ int speed;
+
+ if (!(kstrtoul(p + 6, 0,
+ (unsigned long *)&speed)))
+ if ((speed == SPEED_10) ||
+ (speed == SPEED_100) ||
+ (speed == SPEED_1000) ||
+ (speed == SPEED_10000))
+ nwhwdev[j].speed = speed;
+ }
+
+ }
+ j++;
+ }
+ return 1;
+}
+
+__setup("nwhwconf=", nwhw_config_setup);
Network drivers support hardware level configuration via utilities such as ifconfig, ethtool and mii-tool. However sometimes these settings need to be adjusted before a file system is available (typically if the root file system uses NFS). This patch adds a new support called nwhwconf. It is used in STLinux embedded platforms since long time. This support adds a simple kernel command line interface to configure some common network parameters i.e. the MAC address. In fact, some boards (like ST STB) with embedded the stmmac Ethernet device drivers do not have a MAC address blown into the serial EEPROM and the nwhwconf is actually used for providing it. Enable this feature (CONFIG_NWHW_CONFIG) from the configuration menu as follows: Device Drivers ---> Networking Support ---> Configure network hardware from the command line This is an example how to add the MAC address to the boot command line: nwhwconf=device:<dev>,hwaddr:<addr> where: <dev> is the device name, normally eth0 <addr> is the MAC address, which has the form: xx:xx:xx:xx:xx:xx, Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com> --- drivers/net/Kconfig | 10 +++ drivers/net/Makefile | 1 + drivers/net/nwhwconfig.c | 173 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 184 insertions(+), 0 deletions(-) create mode 100644 drivers/net/nwhwconfig.c