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Commit ace2a4d0 authored by Andreas Mohr's avatar Andreas Mohr Committed by David S. Miller
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MCS7830 USB-Ether: resume _with_ working link, via .reset_resume support 

ChangeLog:
Implement .reset_resume support to retain a live network connection
during suspend despite USB power loss.
- rework operation to reference cached data in mcs7830_data and
  netdev->dev_addr
- update netdev->dev_addr only in case new MAC was set successfully
. Tests done:
  . ethtool -d pre-/post-suspend: register values match
  . running ssh session suspend, resume: works
  . ifdown device, suspend, resume: works
  . ifup, suspend, unplug, resume: WORKS (eth1 is removed, re-ifup of eth1
    after card replug works)
  . verified identical MAC in ifconfig post-resume
    (ok, should be verified on network side to be fully certain...)

Keywords: suspend resume network connection dead interface down
Signed-off-by: default avatarAndreas Mohr <andi@lisas.de>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c774651a
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Showing with 123 additions and 67 deletions
drivers/net/usb/mcs7830.c
View file @ ace2a4d0
......@@ -12,8 +12,6 @@
* Definitions gathered from MOSCHIP, Data Sheet_7830DA.pdf (thanks!).
*
* TODO:
* - add .reset_resume support (iface is _gone_ after resume w/ power loss)
* - verify that mcs7830_get_regs() does have same output pre-/post-suspend
* - support HIF_REG_CONFIG_SLEEPMODE/HIF_REG_CONFIG_TXENABLE (via autopm?)
* - implement ethtool_ops get_pauseparam/set_pauseparam
* via HIF_REG_PAUSE_THRESHOLD (>= revision C only!)
......@@ -137,7 +135,7 @@ static int mcs7830_get_reg(struct usbnet *dev, u16 index, u16 size, void *data)
return ret;
}
static int mcs7830_set_reg(struct usbnet *dev, u16 index, u16 size, void *data)
static int mcs7830_set_reg(struct usbnet *dev, u16 index, u16 size, const void *data)
{
struct usb_device *xdev = dev->udev;
int ret;
......@@ -211,13 +209,43 @@ static void mcs7830_set_reg_async(struct usbnet *dev, u16 index, u16 size, void
usb_free_urb(urb);
}
static int mcs7830_get_address(struct usbnet *dev)
static int mcs7830_hif_get_mac_address(struct usbnet *dev, unsigned char *addr)
{
int ret = mcs7830_get_reg(dev, HIF_REG_ETHERNET_ADDR, ETH_ALEN, addr);
if (ret < 0)
return ret;
return 0;
}
static int mcs7830_hif_set_mac_address(struct usbnet *dev, unsigned char *addr)
{
int ret = mcs7830_set_reg(dev, HIF_REG_ETHERNET_ADDR, ETH_ALEN, addr);
if (ret < 0)
return ret;
return 0;
}
static int mcs7830_set_mac_address(struct net_device *netdev, void *p)
{
int ret;
ret = mcs7830_get_reg(dev, HIF_REG_ETHERNET_ADDR, ETH_ALEN,
dev->net->dev_addr);
struct usbnet *dev = netdev_priv(netdev);
struct sockaddr *addr = p;
if (netif_running(netdev))
return -EBUSY;
if (!is_valid_ether_addr(addr->sa_data))
return -EINVAL;
ret = mcs7830_hif_set_mac_address(dev, addr->sa_data);
if (ret < 0)
return ret;
/* it worked --> adopt it on netdev side */
memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
return 0;
}
......@@ -359,33 +387,6 @@ static void mcs7830_rev_C_fixup(struct usbnet *dev)
}
}
static int mcs7830_init_dev(struct usbnet *dev)
{
int ret;
int retry;
/* Read MAC address from EEPROM */
ret = -EINVAL;
for (retry = 0; retry < 5 && ret; retry++)
ret = mcs7830_get_address(dev);
if (ret) {
dev_warn(&dev->udev->dev, "Cannot read MAC address\n");
goto out;
}
/* Set up PHY */
ret = mcs7830_set_autoneg(dev, 0);
if (ret) {
dev_info(&dev->udev->dev, "Cannot set autoneg\n");
goto out;
}
mcs7830_rev_C_fixup(dev);
ret = 0;
out:
return ret;
}
static int mcs7830_mdio_read(struct net_device *netdev, int phy_id,
int location)
{
......@@ -406,11 +407,33 @@ static int mcs7830_ioctl(struct net_device *net, struct ifreq *rq, int cmd)
return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
}
/* credits go to asix_set_multicast */
static void mcs7830_set_multicast(struct net_device *net)
static inline struct mcs7830_data *mcs7830_get_data(struct usbnet *dev)
{
return (struct mcs7830_data *)&dev->data;
}
static void mcs7830_hif_update_multicast_hash(struct usbnet *dev)
{
struct mcs7830_data *data = mcs7830_get_data(dev);
mcs7830_set_reg_async(dev, HIF_REG_MULTICAST_HASH,
sizeof data->multi_filter,
data->multi_filter);
}
static void mcs7830_hif_update_config(struct usbnet *dev)
{
/* implementation specific to data->config
(argument needs to be heap-based anyway - USB DMA!) */
struct mcs7830_data *data = mcs7830_get_data(dev);
mcs7830_set_reg_async(dev, HIF_REG_CONFIG, 1, &data->config);
}
static void mcs7830_data_set_multicast(struct net_device *net)
{
struct usbnet *dev = netdev_priv(net);
struct mcs7830_data *data = (struct mcs7830_data *)&dev->data;
struct mcs7830_data *data = mcs7830_get_data(dev);
memset(data->multi_filter, 0, sizeof data->multi_filter);
data->config = HIF_REG_CONFIG_TXENABLE;
......@@ -433,21 +456,51 @@ static void mcs7830_set_multicast(struct net_device *net)
u32 crc_bits;
int i;
memset(data->multi_filter, 0, sizeof data->multi_filter);
/* Build the multicast hash filter. */
for (i = 0; i < net->mc_count; i++) {
crc_bits = ether_crc(ETH_ALEN, mc_list->dmi_addr) >> 26;
data->multi_filter[crc_bits >> 3] |= 1 << (crc_bits & 7);
mc_list = mc_list->next;
}
}
}
mcs7830_set_reg_async(dev, HIF_REG_MULTICAST_HASH,
sizeof data->multi_filter,
data->multi_filter);
static int mcs7830_apply_base_config(struct usbnet *dev)
{
int ret;
/* re-configure known MAC (suspend case etc.) */
ret = mcs7830_hif_set_mac_address(dev, dev->net->dev_addr);
if (ret) {
dev_info(&dev->udev->dev, "Cannot set MAC address\n");
goto out;
}
mcs7830_set_reg_async(dev, HIF_REG_CONFIG, 1, &data->config);
/* Set up PHY */
ret = mcs7830_set_autoneg(dev, 0);
if (ret) {
dev_info(&dev->udev->dev, "Cannot set autoneg\n");
goto out;
}
mcs7830_hif_update_multicast_hash(dev);
mcs7830_hif_update_config(dev);
mcs7830_rev_C_fixup(dev);
ret = 0;
out:
return ret;
}
/* credits go to asix_set_multicast */
static void mcs7830_set_multicast(struct net_device *net)
{
struct usbnet *dev = netdev_priv(net);
mcs7830_data_set_multicast(net);
mcs7830_hif_update_multicast_hash(dev);
mcs7830_hif_update_config(dev);
}
static int mcs7830_get_regs_len(struct net_device *net)
......@@ -491,29 +544,6 @@ static const struct ethtool_ops mcs7830_ethtool_ops = {
.nway_reset = usbnet_nway_reset,
};
static int mcs7830_set_mac_address(struct net_device *netdev, void *p)
{
int ret;
struct usbnet *dev = netdev_priv(netdev);
struct sockaddr *addr = p;
if (netif_running(netdev))
return -EBUSY;
if (!is_valid_ether_addr(addr->sa_data))
return -EINVAL;
memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
ret = mcs7830_set_reg(dev, HIF_REG_ETHERNET_ADDR, ETH_ALEN,
netdev->dev_addr);
if (ret < 0)
return ret;
return 0;
}
static const struct net_device_ops mcs7830_netdev_ops = {
.ndo_open = usbnet_open,
.ndo_stop = usbnet_stop,
......@@ -530,14 +560,25 @@ static int mcs7830_bind(struct usbnet *dev, struct usb_interface *udev)
{
struct net_device *net = dev->net;
int ret;
int retry;
ret = mcs7830_init_dev(dev);
/* Initial startup: Gather MAC address setting from EEPROM */
ret = -EINVAL;
for (retry = 0; retry < 5 && ret; retry++)
ret = mcs7830_hif_get_mac_address(dev, net->dev_addr);
if (ret) {
dev_warn(&dev->udev->dev, "Cannot read MAC address\n");
goto out;
}
mcs7830_data_set_multicast(net);
ret = mcs7830_apply_base_config(dev);
if (ret)
goto out;
net->ethtool_ops = &mcs7830_ethtool_ops;
net->netdev_ops = &mcs7830_netdev_ops;
mcs7830_set_multicast(net);
/* reserve space for the status byte on rx */
dev->rx_urb_size = ETH_FRAME_LEN + 1;
......@@ -622,6 +663,20 @@ static const struct usb_device_id products[] = {
};
MODULE_DEVICE_TABLE(usb, products);
static int mcs7830_reset_resume (struct usb_interface *intf)
{
/* YES, this function is successful enough that ethtool -d
does show same output pre-/post-suspend */
struct usbnet *dev = usb_get_intfdata(intf);
mcs7830_apply_base_config(dev);
usbnet_resume(intf);
return 0;
}
static struct usb_driver mcs7830_driver = {
.name = driver_name,
.id_table = products,
......@@ -629,6 +684,7 @@ static struct usb_driver mcs7830_driver = {
.disconnect = usbnet_disconnect,
.suspend = usbnet_suspend,
.resume = usbnet_resume,
.reset_resume = mcs7830_reset_resume,
};
static int __init mcs7830_init(void)
......
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