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Message-ID: <20100131125842.GD13435@rhlx01.hs-esslingen.de>
Date: Sun, 31 Jan 2010 13:58:42 +0100
From: Andreas Mohr <andi@...as.de>
To: David Miller <davem@...emloft.net>, Arnd Bergmann <arnd@...db.de>,
David Hollis <dhollis@...ehollis.com>,
Phil Chang <pchang23@...global.net>
Cc: netdev@...r.kernel.org, linux-usb@...r.kernel.org
Subject: [PATCH 4/4] 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: Andreas Mohr <andi@...as.de>
Index: linux-2.6.33-rc4/drivers/net/usb/mcs7830.c
===================================================================
--- linux-2.6.33-rc4.orig/drivers/net/usb/mcs7830.c 2010-01-31 13:01:24.000000000 +0100
+++ linux-2.6.33-rc4/drivers/net/usb/mcs7830.c 2010-01-31 13:05:17.000000000 +0100
@@ -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 @@
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 @@
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 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 @@
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 @@
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 @@
.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 @@
{
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 @@
};
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 @@
.disconnect = usbnet_disconnect,
.suspend = usbnet_suspend,
.resume = usbnet_resume,
+ .reset_resume = mcs7830_reset_resume,
};
static int __init mcs7830_init(void)
--
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