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![Bjørn Mork](/assets/img/avatar_default.png)
To have an idea of the effects of the protocol coalescing it's useful to have some counters showing the different aspects. Due to the asymmetrical usbnet interface the netdev rx_bytes counter has been counting real received payload, while the tx_bytes counter has included the NCM/MBIM framing overhead. This overhead can be many times the payload because of the aggressive padding strategy of this driver, and will vary a lot depending on device and traffic. With very few exceptions, users are only interested in the payload size. Having an somewhat accurate payload byte counter is particularly important for mobile broadband devices, which many NCM devices and of course all MBIM devices are. Users and userspace applications will use this counter to monitor account quotas. Having protocol specific counters for the overhead, we are now able to correct the tx_bytes netdev counter so that it shows the real payload Signed-off-by: Bjørn Mork <bjorn@mork.no> Signed-off-by: David S. Miller <davem@davemloft.net>
625 lines
17 KiB
C
625 lines
17 KiB
C
/*
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* Copyright (c) 2012 Smith Micro Software, Inc.
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* Copyright (c) 2012 Bjørn Mork <bjorn@mork.no>
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*
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* This driver is based on and reuse most of cdc_ncm, which is
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* Copyright (C) ST-Ericsson 2010-2012
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <linux/ethtool.h>
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#include <linux/if_vlan.h>
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#include <linux/ip.h>
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#include <linux/mii.h>
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#include <linux/usb.h>
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#include <linux/usb/cdc.h>
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#include <linux/usb/usbnet.h>
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#include <linux/usb/cdc-wdm.h>
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#include <linux/usb/cdc_ncm.h>
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#include <net/ipv6.h>
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#include <net/addrconf.h>
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/* alternative VLAN for IP session 0 if not untagged */
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#define MBIM_IPS0_VID 4094
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/* driver specific data - must match cdc_ncm usage */
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struct cdc_mbim_state {
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struct cdc_ncm_ctx *ctx;
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atomic_t pmcount;
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struct usb_driver *subdriver;
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unsigned long _unused;
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unsigned long flags;
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};
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/* flags for the cdc_mbim_state.flags field */
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enum cdc_mbim_flags {
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FLAG_IPS0_VLAN = 1 << 0, /* IP session 0 is tagged */
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};
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/* using a counter to merge subdriver requests with our own into a combined state */
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static int cdc_mbim_manage_power(struct usbnet *dev, int on)
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{
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struct cdc_mbim_state *info = (void *)&dev->data;
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int rv = 0;
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dev_dbg(&dev->intf->dev, "%s() pmcount=%d, on=%d\n", __func__, atomic_read(&info->pmcount), on);
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if ((on && atomic_add_return(1, &info->pmcount) == 1) || (!on && atomic_dec_and_test(&info->pmcount))) {
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/* need autopm_get/put here to ensure the usbcore sees the new value */
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rv = usb_autopm_get_interface(dev->intf);
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dev->intf->needs_remote_wakeup = on;
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if (!rv)
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usb_autopm_put_interface(dev->intf);
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}
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return 0;
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}
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static int cdc_mbim_wdm_manage_power(struct usb_interface *intf, int status)
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{
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struct usbnet *dev = usb_get_intfdata(intf);
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/* can be called while disconnecting */
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if (!dev)
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return 0;
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return cdc_mbim_manage_power(dev, status);
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}
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static int cdc_mbim_rx_add_vid(struct net_device *netdev, __be16 proto, u16 vid)
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{
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struct usbnet *dev = netdev_priv(netdev);
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struct cdc_mbim_state *info = (void *)&dev->data;
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/* creation of this VLAN is a request to tag IP session 0 */
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if (vid == MBIM_IPS0_VID)
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info->flags |= FLAG_IPS0_VLAN;
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else
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if (vid >= 512) /* we don't map these to MBIM session */
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return -EINVAL;
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return 0;
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}
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static int cdc_mbim_rx_kill_vid(struct net_device *netdev, __be16 proto, u16 vid)
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{
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struct usbnet *dev = netdev_priv(netdev);
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struct cdc_mbim_state *info = (void *)&dev->data;
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/* this is a request for an untagged IP session 0 */
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if (vid == MBIM_IPS0_VID)
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info->flags &= ~FLAG_IPS0_VLAN;
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return 0;
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}
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static const struct net_device_ops cdc_mbim_netdev_ops = {
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.ndo_open = usbnet_open,
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.ndo_stop = usbnet_stop,
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.ndo_start_xmit = usbnet_start_xmit,
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.ndo_tx_timeout = usbnet_tx_timeout,
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.ndo_change_mtu = usbnet_change_mtu,
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.ndo_set_mac_address = eth_mac_addr,
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.ndo_validate_addr = eth_validate_addr,
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.ndo_vlan_rx_add_vid = cdc_mbim_rx_add_vid,
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.ndo_vlan_rx_kill_vid = cdc_mbim_rx_kill_vid,
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};
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/* Change the control interface altsetting and update the .driver_info
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* pointer if the matching entry after changing class codes points to
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* a different struct
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*/
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static int cdc_mbim_set_ctrlalt(struct usbnet *dev, struct usb_interface *intf, u8 alt)
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{
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struct usb_driver *driver = to_usb_driver(intf->dev.driver);
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const struct usb_device_id *id;
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struct driver_info *info;
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int ret;
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ret = usb_set_interface(dev->udev,
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intf->cur_altsetting->desc.bInterfaceNumber,
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alt);
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if (ret)
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return ret;
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id = usb_match_id(intf, driver->id_table);
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if (!id)
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return -ENODEV;
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info = (struct driver_info *)id->driver_info;
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if (info != dev->driver_info) {
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dev_dbg(&intf->dev, "driver_info updated to '%s'\n",
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info->description);
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dev->driver_info = info;
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}
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return 0;
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}
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static int cdc_mbim_bind(struct usbnet *dev, struct usb_interface *intf)
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{
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struct cdc_ncm_ctx *ctx;
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struct usb_driver *subdriver = ERR_PTR(-ENODEV);
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int ret = -ENODEV;
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u8 data_altsetting = 1;
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struct cdc_mbim_state *info = (void *)&dev->data;
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/* should we change control altsetting on a NCM/MBIM function? */
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if (cdc_ncm_select_altsetting(intf) == CDC_NCM_COMM_ALTSETTING_MBIM) {
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data_altsetting = CDC_NCM_DATA_ALTSETTING_MBIM;
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ret = cdc_mbim_set_ctrlalt(dev, intf, CDC_NCM_COMM_ALTSETTING_MBIM);
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if (ret)
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goto err;
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ret = -ENODEV;
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}
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/* we will hit this for NCM/MBIM functions if prefer_mbim is false */
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if (!cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting))
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goto err;
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ret = cdc_ncm_bind_common(dev, intf, data_altsetting);
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if (ret)
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goto err;
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ctx = info->ctx;
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/* The MBIM descriptor and the status endpoint are required */
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if (ctx->mbim_desc && dev->status)
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subdriver = usb_cdc_wdm_register(ctx->control,
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&dev->status->desc,
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le16_to_cpu(ctx->mbim_desc->wMaxControlMessage),
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cdc_mbim_wdm_manage_power);
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if (IS_ERR(subdriver)) {
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ret = PTR_ERR(subdriver);
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cdc_ncm_unbind(dev, intf);
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goto err;
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}
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/* can't let usbnet use the interrupt endpoint */
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dev->status = NULL;
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info->subdriver = subdriver;
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/* MBIM cannot do ARP */
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dev->net->flags |= IFF_NOARP;
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/* no need to put the VLAN tci in the packet headers */
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dev->net->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_FILTER;
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/* monitor VLAN additions and removals */
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dev->net->netdev_ops = &cdc_mbim_netdev_ops;
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err:
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return ret;
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}
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static void cdc_mbim_unbind(struct usbnet *dev, struct usb_interface *intf)
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{
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struct cdc_mbim_state *info = (void *)&dev->data;
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struct cdc_ncm_ctx *ctx = info->ctx;
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/* disconnect subdriver from control interface */
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if (info->subdriver && info->subdriver->disconnect)
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info->subdriver->disconnect(ctx->control);
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info->subdriver = NULL;
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/* let NCM unbind clean up both control and data interface */
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cdc_ncm_unbind(dev, intf);
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}
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/* verify that the ethernet protocol is IPv4 or IPv6 */
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static bool is_ip_proto(__be16 proto)
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{
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switch (proto) {
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case htons(ETH_P_IP):
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case htons(ETH_P_IPV6):
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return true;
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}
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return false;
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}
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static struct sk_buff *cdc_mbim_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
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{
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struct sk_buff *skb_out;
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struct cdc_mbim_state *info = (void *)&dev->data;
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struct cdc_ncm_ctx *ctx = info->ctx;
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__le32 sign = cpu_to_le32(USB_CDC_MBIM_NDP16_IPS_SIGN);
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u16 tci = 0;
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bool is_ip;
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u8 *c;
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if (!ctx)
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goto error;
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if (skb) {
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if (skb->len <= ETH_HLEN)
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goto error;
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/* Some applications using e.g. packet sockets will
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* bypass the VLAN acceleration and create tagged
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* ethernet frames directly. We primarily look for
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* the accelerated out-of-band tag, but fall back if
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* required
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*/
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skb_reset_mac_header(skb);
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if (vlan_get_tag(skb, &tci) < 0 && skb->len > VLAN_ETH_HLEN &&
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__vlan_get_tag(skb, &tci) == 0) {
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is_ip = is_ip_proto(vlan_eth_hdr(skb)->h_vlan_encapsulated_proto);
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skb_pull(skb, VLAN_ETH_HLEN);
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} else {
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is_ip = is_ip_proto(eth_hdr(skb)->h_proto);
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skb_pull(skb, ETH_HLEN);
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}
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/* Is IP session <0> tagged too? */
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if (info->flags & FLAG_IPS0_VLAN) {
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/* drop all untagged packets */
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if (!tci)
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goto error;
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/* map MBIM_IPS0_VID to IPS<0> */
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if (tci == MBIM_IPS0_VID)
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tci = 0;
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}
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/* mapping VLANs to MBIM sessions:
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* no tag => IPS session <0> if !FLAG_IPS0_VLAN
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* 1 - 255 => IPS session <vlanid>
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* 256 - 511 => DSS session <vlanid - 256>
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* 512 - 4093 => unsupported, drop
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* 4094 => IPS session <0> if FLAG_IPS0_VLAN
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*/
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switch (tci & 0x0f00) {
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case 0x0000: /* VLAN ID 0 - 255 */
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if (!is_ip)
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goto error;
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c = (u8 *)&sign;
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c[3] = tci;
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break;
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case 0x0100: /* VLAN ID 256 - 511 */
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if (is_ip)
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goto error;
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sign = cpu_to_le32(USB_CDC_MBIM_NDP16_DSS_SIGN);
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c = (u8 *)&sign;
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c[3] = tci;
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break;
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default:
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netif_err(dev, tx_err, dev->net,
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"unsupported tci=0x%04x\n", tci);
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goto error;
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}
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}
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spin_lock_bh(&ctx->mtx);
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skb_out = cdc_ncm_fill_tx_frame(dev, skb, sign);
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spin_unlock_bh(&ctx->mtx);
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return skb_out;
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error:
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if (skb)
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dev_kfree_skb_any(skb);
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return NULL;
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}
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/* Some devices are known to send Neigbor Solicitation messages and
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* require Neigbor Advertisement replies. The IPv6 core will not
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* respond since IFF_NOARP is set, so we must handle them ourselves.
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*/
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static void do_neigh_solicit(struct usbnet *dev, u8 *buf, u16 tci)
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{
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struct ipv6hdr *iph = (void *)buf;
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struct nd_msg *msg = (void *)(iph + 1);
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struct net_device *netdev;
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struct inet6_dev *in6_dev;
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bool is_router;
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/* we'll only respond to requests from unicast addresses to
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* our solicited node addresses.
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*/
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if (!ipv6_addr_is_solict_mult(&iph->daddr) ||
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!(ipv6_addr_type(&iph->saddr) & IPV6_ADDR_UNICAST))
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return;
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/* need to send the NA on the VLAN dev, if any */
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rcu_read_lock();
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if (tci) {
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netdev = __vlan_find_dev_deep_rcu(dev->net, htons(ETH_P_8021Q),
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tci);
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if (!netdev) {
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rcu_read_unlock();
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return;
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}
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} else {
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netdev = dev->net;
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}
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dev_hold(netdev);
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rcu_read_unlock();
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in6_dev = in6_dev_get(netdev);
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if (!in6_dev)
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goto out;
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is_router = !!in6_dev->cnf.forwarding;
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in6_dev_put(in6_dev);
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/* ipv6_stub != NULL if in6_dev_get returned an inet6_dev */
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ipv6_stub->ndisc_send_na(netdev, NULL, &iph->saddr, &msg->target,
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is_router /* router */,
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true /* solicited */,
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false /* override */,
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true /* inc_opt */);
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out:
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dev_put(netdev);
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}
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static bool is_neigh_solicit(u8 *buf, size_t len)
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{
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struct ipv6hdr *iph = (void *)buf;
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struct nd_msg *msg = (void *)(iph + 1);
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return (len >= sizeof(struct ipv6hdr) + sizeof(struct nd_msg) &&
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iph->nexthdr == IPPROTO_ICMPV6 &&
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msg->icmph.icmp6_code == 0 &&
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msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION);
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}
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static struct sk_buff *cdc_mbim_process_dgram(struct usbnet *dev, u8 *buf, size_t len, u16 tci)
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{
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__be16 proto = htons(ETH_P_802_3);
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struct sk_buff *skb = NULL;
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if (tci < 256 || tci == MBIM_IPS0_VID) { /* IPS session? */
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if (len < sizeof(struct iphdr))
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goto err;
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switch (*buf & 0xf0) {
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case 0x40:
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proto = htons(ETH_P_IP);
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break;
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case 0x60:
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if (is_neigh_solicit(buf, len))
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do_neigh_solicit(dev, buf, tci);
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proto = htons(ETH_P_IPV6);
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break;
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default:
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goto err;
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}
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}
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skb = netdev_alloc_skb_ip_align(dev->net, len + ETH_HLEN);
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if (!skb)
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goto err;
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/* add an ethernet header */
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skb_put(skb, ETH_HLEN);
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skb_reset_mac_header(skb);
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eth_hdr(skb)->h_proto = proto;
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memset(eth_hdr(skb)->h_source, 0, ETH_ALEN);
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memcpy(eth_hdr(skb)->h_dest, dev->net->dev_addr, ETH_ALEN);
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/* add datagram */
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memcpy(skb_put(skb, len), buf, len);
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/* map MBIM session to VLAN */
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if (tci)
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vlan_put_tag(skb, htons(ETH_P_8021Q), tci);
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err:
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return skb;
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}
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static int cdc_mbim_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in)
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{
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struct sk_buff *skb;
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struct cdc_mbim_state *info = (void *)&dev->data;
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struct cdc_ncm_ctx *ctx = info->ctx;
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int len;
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int nframes;
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int x;
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int offset;
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struct usb_cdc_ncm_ndp16 *ndp16;
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struct usb_cdc_ncm_dpe16 *dpe16;
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int ndpoffset;
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int loopcount = 50; /* arbitrary max preventing infinite loop */
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u32 payload = 0;
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u8 *c;
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u16 tci;
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ndpoffset = cdc_ncm_rx_verify_nth16(ctx, skb_in);
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if (ndpoffset < 0)
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goto error;
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next_ndp:
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nframes = cdc_ncm_rx_verify_ndp16(skb_in, ndpoffset);
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if (nframes < 0)
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goto error;
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ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
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switch (ndp16->dwSignature & cpu_to_le32(0x00ffffff)) {
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case cpu_to_le32(USB_CDC_MBIM_NDP16_IPS_SIGN):
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c = (u8 *)&ndp16->dwSignature;
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tci = c[3];
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/* tag IPS<0> packets too if MBIM_IPS0_VID exists */
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if (!tci && info->flags & FLAG_IPS0_VLAN)
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tci = MBIM_IPS0_VID;
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break;
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case cpu_to_le32(USB_CDC_MBIM_NDP16_DSS_SIGN):
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c = (u8 *)&ndp16->dwSignature;
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tci = c[3] + 256;
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break;
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default:
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netif_dbg(dev, rx_err, dev->net,
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"unsupported NDP signature <0x%08x>\n",
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le32_to_cpu(ndp16->dwSignature));
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goto err_ndp;
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}
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dpe16 = ndp16->dpe16;
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for (x = 0; x < nframes; x++, dpe16++) {
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offset = le16_to_cpu(dpe16->wDatagramIndex);
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len = le16_to_cpu(dpe16->wDatagramLength);
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/*
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* CDC NCM ch. 3.7
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* All entries after first NULL entry are to be ignored
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*/
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if ((offset == 0) || (len == 0)) {
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|
if (!x)
|
|
goto err_ndp; /* empty NTB */
|
|
break;
|
|
}
|
|
|
|
/* sanity checking */
|
|
if (((offset + len) > skb_in->len) || (len > ctx->rx_max)) {
|
|
netif_dbg(dev, rx_err, dev->net,
|
|
"invalid frame detected (ignored) offset[%u]=%u, length=%u, skb=%p\n",
|
|
x, offset, len, skb_in);
|
|
if (!x)
|
|
goto err_ndp;
|
|
break;
|
|
} else {
|
|
skb = cdc_mbim_process_dgram(dev, skb_in->data + offset, len, tci);
|
|
if (!skb)
|
|
goto error;
|
|
usbnet_skb_return(dev, skb);
|
|
payload += len; /* count payload bytes in this NTB */
|
|
}
|
|
}
|
|
err_ndp:
|
|
/* are there more NDPs to process? */
|
|
ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
|
|
if (ndpoffset && loopcount--)
|
|
goto next_ndp;
|
|
|
|
/* update stats */
|
|
ctx->rx_overhead += skb_in->len - payload;
|
|
ctx->rx_ntbs++;
|
|
|
|
return 1;
|
|
error:
|
|
return 0;
|
|
}
|
|
|
|
static int cdc_mbim_suspend(struct usb_interface *intf, pm_message_t message)
|
|
{
|
|
int ret = -ENODEV;
|
|
struct usbnet *dev = usb_get_intfdata(intf);
|
|
struct cdc_mbim_state *info = (void *)&dev->data;
|
|
struct cdc_ncm_ctx *ctx = info->ctx;
|
|
|
|
if (!ctx)
|
|
goto error;
|
|
|
|
/*
|
|
* Both usbnet_suspend() and subdriver->suspend() MUST return 0
|
|
* in system sleep context, otherwise, the resume callback has
|
|
* to recover device from previous suspend failure.
|
|
*/
|
|
ret = usbnet_suspend(intf, message);
|
|
if (ret < 0)
|
|
goto error;
|
|
|
|
if (intf == ctx->control && info->subdriver && info->subdriver->suspend)
|
|
ret = info->subdriver->suspend(intf, message);
|
|
if (ret < 0)
|
|
usbnet_resume(intf);
|
|
|
|
error:
|
|
return ret;
|
|
}
|
|
|
|
static int cdc_mbim_resume(struct usb_interface *intf)
|
|
{
|
|
int ret = 0;
|
|
struct usbnet *dev = usb_get_intfdata(intf);
|
|
struct cdc_mbim_state *info = (void *)&dev->data;
|
|
struct cdc_ncm_ctx *ctx = info->ctx;
|
|
bool callsub = (intf == ctx->control && info->subdriver && info->subdriver->resume);
|
|
|
|
if (callsub)
|
|
ret = info->subdriver->resume(intf);
|
|
if (ret < 0)
|
|
goto err;
|
|
ret = usbnet_resume(intf);
|
|
if (ret < 0 && callsub)
|
|
info->subdriver->suspend(intf, PMSG_SUSPEND);
|
|
err:
|
|
return ret;
|
|
}
|
|
|
|
static const struct driver_info cdc_mbim_info = {
|
|
.description = "CDC MBIM",
|
|
.flags = FLAG_NO_SETINT | FLAG_MULTI_PACKET | FLAG_WWAN,
|
|
.bind = cdc_mbim_bind,
|
|
.unbind = cdc_mbim_unbind,
|
|
.manage_power = cdc_mbim_manage_power,
|
|
.rx_fixup = cdc_mbim_rx_fixup,
|
|
.tx_fixup = cdc_mbim_tx_fixup,
|
|
};
|
|
|
|
/* MBIM and NCM devices should not need a ZLP after NTBs with
|
|
* dwNtbOutMaxSize length. Nevertheless, a number of devices from
|
|
* different vendor IDs will fail unless we send ZLPs, forcing us
|
|
* to make this the default.
|
|
*
|
|
* This default may cause a performance penalty for spec conforming
|
|
* devices wanting to take advantage of optimizations possible without
|
|
* ZLPs. A whitelist is added in an attempt to avoid this for devices
|
|
* known to conform to the MBIM specification.
|
|
*
|
|
* All known devices supporting NCM compatibility mode are also
|
|
* conforming to the NCM and MBIM specifications. For this reason, the
|
|
* NCM subclass entry is also in the ZLP whitelist.
|
|
*/
|
|
static const struct driver_info cdc_mbim_info_zlp = {
|
|
.description = "CDC MBIM",
|
|
.flags = FLAG_NO_SETINT | FLAG_MULTI_PACKET | FLAG_WWAN | FLAG_SEND_ZLP,
|
|
.bind = cdc_mbim_bind,
|
|
.unbind = cdc_mbim_unbind,
|
|
.manage_power = cdc_mbim_manage_power,
|
|
.rx_fixup = cdc_mbim_rx_fixup,
|
|
.tx_fixup = cdc_mbim_tx_fixup,
|
|
};
|
|
|
|
static const struct usb_device_id mbim_devs[] = {
|
|
/* This duplicate NCM entry is intentional. MBIM devices can
|
|
* be disguised as NCM by default, and this is necessary to
|
|
* allow us to bind the correct driver_info to such devices.
|
|
*
|
|
* bind() will sort out this for us, selecting the correct
|
|
* entry and reject the other
|
|
*/
|
|
{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
|
|
.driver_info = (unsigned long)&cdc_mbim_info,
|
|
},
|
|
/* ZLP conformance whitelist: All Ericsson MBIM devices */
|
|
{ USB_VENDOR_AND_INTERFACE_INFO(0x0bdb, USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE),
|
|
.driver_info = (unsigned long)&cdc_mbim_info,
|
|
},
|
|
/* default entry */
|
|
{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_MBIM, USB_CDC_PROTO_NONE),
|
|
.driver_info = (unsigned long)&cdc_mbim_info_zlp,
|
|
},
|
|
{
|
|
},
|
|
};
|
|
MODULE_DEVICE_TABLE(usb, mbim_devs);
|
|
|
|
static struct usb_driver cdc_mbim_driver = {
|
|
.name = "cdc_mbim",
|
|
.id_table = mbim_devs,
|
|
.probe = usbnet_probe,
|
|
.disconnect = usbnet_disconnect,
|
|
.suspend = cdc_mbim_suspend,
|
|
.resume = cdc_mbim_resume,
|
|
.reset_resume = cdc_mbim_resume,
|
|
.supports_autosuspend = 1,
|
|
.disable_hub_initiated_lpm = 1,
|
|
};
|
|
module_usb_driver(cdc_mbim_driver);
|
|
|
|
MODULE_AUTHOR("Greg Suarez <gsuarez@smithmicro.com>");
|
|
MODULE_AUTHOR("Bjørn Mork <bjorn@mork.no>");
|
|
MODULE_DESCRIPTION("USB CDC MBIM host driver");
|
|
MODULE_LICENSE("GPL");
|