Commit ace2a4d0 authored by Andreas Mohr's avatar Andreas Mohr Committed by David S. Miller
Browse files

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

drivers/net/usb/mcs7830.c

+123 −67
Original line number Diff line number Diff line
@@ -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 @@ out: 
	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;



	/* 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_init_dev(dev);

	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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