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@lisas.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andreas Mohr
David S. Miller
parent
c774651a5f
commit
ace2a4d0fb
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@ -12,8 +12,6 @@
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* Definitions gathered from MOSCHIP, Data Sheet_7830DA.pdf (thanks!).
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*
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* TODO:
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* - add .reset_resume support (iface is _gone_ after resume w/ power loss)
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* - verify that mcs7830_get_regs() does have same output pre-/post-suspend
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* - support HIF_REG_CONFIG_SLEEPMODE/HIF_REG_CONFIG_TXENABLE (via autopm?)
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* - implement ethtool_ops get_pauseparam/set_pauseparam
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* via HIF_REG_PAUSE_THRESHOLD (>= revision C only!)
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@ -137,7 +135,7 @@ static int mcs7830_get_reg(struct usbnet *dev, u16 index, u16 size, void *data)
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return ret;
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}
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static int mcs7830_set_reg(struct usbnet *dev, u16 index, u16 size, void *data)
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static int mcs7830_set_reg(struct usbnet *dev, u16 index, u16 size, const void *data)
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{
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struct usb_device *xdev = dev->udev;
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int ret;
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@ -211,16 +209,46 @@ out:
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usb_free_urb(urb);
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}
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static int mcs7830_get_address(struct usbnet *dev)
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static int mcs7830_hif_get_mac_address(struct usbnet *dev, unsigned char *addr)
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{
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int ret;
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ret = mcs7830_get_reg(dev, HIF_REG_ETHERNET_ADDR, ETH_ALEN,
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dev->net->dev_addr);
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int ret = mcs7830_get_reg(dev, HIF_REG_ETHERNET_ADDR, ETH_ALEN, addr);
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if (ret < 0)
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return ret;
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return 0;
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}
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static int mcs7830_hif_set_mac_address(struct usbnet *dev, unsigned char *addr)
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{
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int ret = mcs7830_set_reg(dev, HIF_REG_ETHERNET_ADDR, ETH_ALEN, addr);
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if (ret < 0)
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return ret;
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return 0;
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}
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static int mcs7830_set_mac_address(struct net_device *netdev, void *p)
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{
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int ret;
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struct usbnet *dev = netdev_priv(netdev);
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struct sockaddr *addr = p;
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if (netif_running(netdev))
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return -EBUSY;
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if (!is_valid_ether_addr(addr->sa_data))
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return -EINVAL;
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ret = mcs7830_hif_set_mac_address(dev, addr->sa_data);
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if (ret < 0)
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return ret;
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/* it worked --> adopt it on netdev side */
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memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
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return 0;
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}
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static int mcs7830_read_phy(struct usbnet *dev, u8 index)
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{
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int ret;
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@ -359,33 +387,6 @@ static void mcs7830_rev_C_fixup(struct usbnet *dev)
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}
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}
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static int mcs7830_init_dev(struct usbnet *dev)
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{
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int ret;
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int retry;
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/* Read MAC address from EEPROM */
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ret = -EINVAL;
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for (retry = 0; retry < 5 && ret; retry++)
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ret = mcs7830_get_address(dev);
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if (ret) {
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dev_warn(&dev->udev->dev, "Cannot read MAC address\n");
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goto out;
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}
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/* Set up PHY */
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ret = mcs7830_set_autoneg(dev, 0);
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if (ret) {
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dev_info(&dev->udev->dev, "Cannot set autoneg\n");
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goto out;
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}
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mcs7830_rev_C_fixup(dev);
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ret = 0;
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out:
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return ret;
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}
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static int mcs7830_mdio_read(struct net_device *netdev, int phy_id,
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int location)
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{
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@ -406,11 +407,33 @@ static int mcs7830_ioctl(struct net_device *net, struct ifreq *rq, int cmd)
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return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
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}
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/* credits go to asix_set_multicast */
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static void mcs7830_set_multicast(struct net_device *net)
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static inline struct mcs7830_data *mcs7830_get_data(struct usbnet *dev)
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{
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return (struct mcs7830_data *)&dev->data;
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}
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static void mcs7830_hif_update_multicast_hash(struct usbnet *dev)
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{
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struct mcs7830_data *data = mcs7830_get_data(dev);
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mcs7830_set_reg_async(dev, HIF_REG_MULTICAST_HASH,
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sizeof data->multi_filter,
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data->multi_filter);
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}
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static void mcs7830_hif_update_config(struct usbnet *dev)
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{
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/* implementation specific to data->config
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(argument needs to be heap-based anyway - USB DMA!) */
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struct mcs7830_data *data = mcs7830_get_data(dev);
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mcs7830_set_reg_async(dev, HIF_REG_CONFIG, 1, &data->config);
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}
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static void mcs7830_data_set_multicast(struct net_device *net)
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{
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struct usbnet *dev = netdev_priv(net);
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struct mcs7830_data *data = (struct mcs7830_data *)&dev->data;
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struct mcs7830_data *data = mcs7830_get_data(dev);
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memset(data->multi_filter, 0, sizeof data->multi_filter);
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data->config = HIF_REG_CONFIG_TXENABLE;
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@ -433,21 +456,51 @@ static void mcs7830_set_multicast(struct net_device *net)
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u32 crc_bits;
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int i;
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memset(data->multi_filter, 0, sizeof data->multi_filter);
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/* Build the multicast hash filter. */
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for (i = 0; i < net->mc_count; i++) {
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crc_bits = ether_crc(ETH_ALEN, mc_list->dmi_addr) >> 26;
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data->multi_filter[crc_bits >> 3] |= 1 << (crc_bits & 7);
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mc_list = mc_list->next;
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}
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}
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}
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mcs7830_set_reg_async(dev, HIF_REG_MULTICAST_HASH,
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sizeof data->multi_filter,
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data->multi_filter);
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static int mcs7830_apply_base_config(struct usbnet *dev)
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{
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int ret;
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/* re-configure known MAC (suspend case etc.) */
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ret = mcs7830_hif_set_mac_address(dev, dev->net->dev_addr);
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if (ret) {
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dev_info(&dev->udev->dev, "Cannot set MAC address\n");
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goto out;
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}
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mcs7830_set_reg_async(dev, HIF_REG_CONFIG, 1, &data->config);
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/* Set up PHY */
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ret = mcs7830_set_autoneg(dev, 0);
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if (ret) {
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dev_info(&dev->udev->dev, "Cannot set autoneg\n");
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goto out;
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}
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mcs7830_hif_update_multicast_hash(dev);
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mcs7830_hif_update_config(dev);
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mcs7830_rev_C_fixup(dev);
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ret = 0;
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out:
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return ret;
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}
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/* credits go to asix_set_multicast */
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static void mcs7830_set_multicast(struct net_device *net)
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{
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struct usbnet *dev = netdev_priv(net);
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mcs7830_data_set_multicast(net);
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mcs7830_hif_update_multicast_hash(dev);
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mcs7830_hif_update_config(dev);
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}
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static int mcs7830_get_regs_len(struct net_device *net)
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@ -491,29 +544,6 @@ static const struct ethtool_ops mcs7830_ethtool_ops = {
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.nway_reset = usbnet_nway_reset,
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};
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static int mcs7830_set_mac_address(struct net_device *netdev, void *p)
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{
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int ret;
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struct usbnet *dev = netdev_priv(netdev);
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struct sockaddr *addr = p;
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if (netif_running(netdev))
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return -EBUSY;
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if (!is_valid_ether_addr(addr->sa_data))
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return -EINVAL;
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memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
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ret = mcs7830_set_reg(dev, HIF_REG_ETHERNET_ADDR, ETH_ALEN,
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netdev->dev_addr);
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if (ret < 0)
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return ret;
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return 0;
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}
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static const struct net_device_ops mcs7830_netdev_ops = {
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.ndo_open = usbnet_open,
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.ndo_stop = usbnet_stop,
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@ -530,14 +560,25 @@ static int mcs7830_bind(struct usbnet *dev, struct usb_interface *udev)
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{
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struct net_device *net = dev->net;
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int ret;
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int retry;
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ret = mcs7830_init_dev(dev);
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/* Initial startup: Gather MAC address setting from EEPROM */
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ret = -EINVAL;
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for (retry = 0; retry < 5 && ret; retry++)
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ret = mcs7830_hif_get_mac_address(dev, net->dev_addr);
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if (ret) {
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dev_warn(&dev->udev->dev, "Cannot read MAC address\n");
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goto out;
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}
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mcs7830_data_set_multicast(net);
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ret = mcs7830_apply_base_config(dev);
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if (ret)
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goto out;
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net->ethtool_ops = &mcs7830_ethtool_ops;
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net->netdev_ops = &mcs7830_netdev_ops;
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mcs7830_set_multicast(net);
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/* reserve space for the status byte on rx */
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dev->rx_urb_size = ETH_FRAME_LEN + 1;
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@ -622,6 +663,20 @@ static const struct usb_device_id products[] = {
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};
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MODULE_DEVICE_TABLE(usb, products);
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static int mcs7830_reset_resume (struct usb_interface *intf)
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{
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/* YES, this function is successful enough that ethtool -d
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does show same output pre-/post-suspend */
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struct usbnet *dev = usb_get_intfdata(intf);
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mcs7830_apply_base_config(dev);
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usbnet_resume(intf);
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return 0;
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}
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static struct usb_driver mcs7830_driver = {
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.name = driver_name,
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.id_table = products,
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@ -629,6 +684,7 @@ static struct usb_driver mcs7830_driver = {
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.disconnect = usbnet_disconnect,
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.suspend = usbnet_suspend,
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.resume = usbnet_resume,
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.reset_resume = mcs7830_reset_resume,
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};
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static int __init mcs7830_init(void)
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