| /* |
| * cdc_ncm.c |
| * |
| * Copyright (C) ST-Ericsson 2010-2012 |
| * Contact: Alexey Orishko <alexey.orishko@stericsson.com> |
| * Original author: Hans Petter Selasky <hans.petter.selasky@stericsson.com> |
| * |
| * USB Host Driver for Network Control Model (NCM) |
| * http://www.usb.org/developers/devclass_docs/NCM10.zip |
| * |
| * The NCM encoding, decoding and initialization logic |
| * derives from FreeBSD 8.x. if_cdce.c and if_cdcereg.h |
| * |
| * This software is available to you under a choice of one of two |
| * licenses. You may choose this file to be licensed under the terms |
| * of the GNU General Public License (GPL) Version 2 or the 2-clause |
| * BSD license listed below: |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/netdevice.h> |
| #include <linux/ctype.h> |
| #include <linux/ethtool.h> |
| #include <linux/workqueue.h> |
| #include <linux/mii.h> |
| #include <linux/crc32.h> |
| #include <linux/usb.h> |
| #include <linux/hrtimer.h> |
| #include <linux/atomic.h> |
| #include <linux/usb/usbnet.h> |
| #include <linux/usb/cdc.h> |
| #include <linux/usb/cdc_ncm.h> |
| |
| #if IS_ENABLED(CONFIG_USB_NET_CDC_MBIM) |
| static bool prefer_mbim = true; |
| #else |
| static bool prefer_mbim; |
| #endif |
| module_param(prefer_mbim, bool, S_IRUGO | S_IWUSR); |
| MODULE_PARM_DESC(prefer_mbim, "Prefer MBIM setting on dual NCM/MBIM functions"); |
| |
| static void cdc_ncm_txpath_bh(unsigned long param); |
| static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx); |
| static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *hr_timer); |
| static struct usb_driver cdc_ncm_driver; |
| |
| static int cdc_ncm_get_coalesce(struct net_device *netdev, |
| struct ethtool_coalesce *ec) |
| { |
| struct usbnet *dev = netdev_priv(netdev); |
| struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; |
| |
| /* assuming maximum sized dgrams and ignoring NDPs */ |
| ec->rx_max_coalesced_frames = ctx->rx_max / ctx->max_datagram_size; |
| ec->tx_max_coalesced_frames = ctx->tx_max / ctx->max_datagram_size; |
| |
| /* the timer will fire CDC_NCM_TIMER_PENDING_CNT times in a row */ |
| ec->tx_coalesce_usecs = (ctx->timer_interval * CDC_NCM_TIMER_PENDING_CNT) / NSEC_PER_USEC; |
| return 0; |
| } |
| |
| static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx); |
| |
| static int cdc_ncm_set_coalesce(struct net_device *netdev, |
| struct ethtool_coalesce *ec) |
| { |
| struct usbnet *dev = netdev_priv(netdev); |
| struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; |
| u32 new_rx_max = ctx->rx_max; |
| u32 new_tx_max = ctx->tx_max; |
| |
| /* assuming maximum sized dgrams and a single NDP */ |
| if (ec->rx_max_coalesced_frames) |
| new_rx_max = ec->rx_max_coalesced_frames * ctx->max_datagram_size; |
| if (ec->tx_max_coalesced_frames) |
| new_tx_max = ec->tx_max_coalesced_frames * ctx->max_datagram_size; |
| |
| if (ec->tx_coalesce_usecs && |
| (ec->tx_coalesce_usecs < CDC_NCM_TIMER_INTERVAL_MIN * CDC_NCM_TIMER_PENDING_CNT || |
| ec->tx_coalesce_usecs > CDC_NCM_TIMER_INTERVAL_MAX * CDC_NCM_TIMER_PENDING_CNT)) |
| return -EINVAL; |
| |
| spin_lock_bh(&ctx->mtx); |
| ctx->timer_interval = ec->tx_coalesce_usecs * NSEC_PER_USEC / CDC_NCM_TIMER_PENDING_CNT; |
| if (!ctx->timer_interval) |
| ctx->tx_timer_pending = 0; |
| spin_unlock_bh(&ctx->mtx); |
| |
| /* inform device of new values */ |
| if (new_rx_max != ctx->rx_max || new_tx_max != ctx->tx_max) |
| cdc_ncm_update_rxtx_max(dev, new_rx_max, new_tx_max); |
| return 0; |
| } |
| |
| static const struct ethtool_ops cdc_ncm_ethtool_ops = { |
| .get_settings = usbnet_get_settings, |
| .set_settings = usbnet_set_settings, |
| .get_link = usbnet_get_link, |
| .nway_reset = usbnet_nway_reset, |
| .get_drvinfo = usbnet_get_drvinfo, |
| .get_msglevel = usbnet_get_msglevel, |
| .set_msglevel = usbnet_set_msglevel, |
| .get_ts_info = ethtool_op_get_ts_info, |
| .get_coalesce = cdc_ncm_get_coalesce, |
| .set_coalesce = cdc_ncm_set_coalesce, |
| }; |
| |
| /* handle rx_max and tx_max changes */ |
| static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx) |
| { |
| struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; |
| u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber; |
| u32 val, max, min; |
| |
| /* clamp new_rx to sane values */ |
| min = USB_CDC_NCM_NTB_MIN_IN_SIZE; |
| max = min_t(u32, CDC_NCM_NTB_MAX_SIZE_RX, le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize)); |
| |
| /* dwNtbInMaxSize spec violation? Use MIN size for both limits */ |
| if (max < min) { |
| dev_warn(&dev->intf->dev, "dwNtbInMaxSize=%u is too small. Using %u\n", |
| le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize), min); |
| max = min; |
| } |
| |
| val = clamp_t(u32, new_rx, min, max); |
| if (val != new_rx) { |
| dev_dbg(&dev->intf->dev, "rx_max must be in the [%u, %u] range. Using %u\n", |
| min, max, val); |
| } |
| |
| /* usbnet use these values for sizing rx queues */ |
| dev->rx_urb_size = val; |
| |
| /* inform device about NTB input size changes */ |
| if (val != ctx->rx_max) { |
| __le32 dwNtbInMaxSize = cpu_to_le32(val); |
| |
| dev_info(&dev->intf->dev, "setting rx_max = %u\n", val); |
| |
| /* need to unlink rx urbs before increasing buffer size */ |
| if (netif_running(dev->net) && dev->rx_urb_size > ctx->rx_max) |
| usbnet_unlink_rx_urbs(dev); |
| |
| /* tell device to use new size */ |
| if (usbnet_write_cmd(dev, USB_CDC_SET_NTB_INPUT_SIZE, |
| USB_TYPE_CLASS | USB_DIR_OUT |
| | USB_RECIP_INTERFACE, |
| 0, iface_no, &dwNtbInMaxSize, 4) < 0) |
| dev_dbg(&dev->intf->dev, "Setting NTB Input Size failed\n"); |
| else |
| ctx->rx_max = val; |
| } |
| |
| /* clamp new_tx to sane values */ |
| min = ctx->max_datagram_size + ctx->max_ndp_size + sizeof(struct usb_cdc_ncm_nth16); |
| max = min_t(u32, CDC_NCM_NTB_MAX_SIZE_TX, le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize)); |
| |
| /* some devices set dwNtbOutMaxSize too low for the above default */ |
| min = min(min, max); |
| |
| val = clamp_t(u32, new_tx, min, max); |
| if (val != new_tx) { |
| dev_dbg(&dev->intf->dev, "tx_max must be in the [%u, %u] range. Using %u\n", |
| min, max, val); |
| } |
| if (val != ctx->tx_max) |
| dev_info(&dev->intf->dev, "setting tx_max = %u\n", val); |
| |
| /* Adding a pad byte here if necessary simplifies the handling |
| * in cdc_ncm_fill_tx_frame, making tx_max always represent |
| * the real skb max size. |
| * |
| * We cannot use dev->maxpacket here because this is called from |
| * .bind which is called before usbnet sets up dev->maxpacket |
| */ |
| if (val != le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize) && |
| val % usb_maxpacket(dev->udev, dev->out, 1) == 0) |
| val++; |
| |
| /* we might need to flush any pending tx buffers if running */ |
| if (netif_running(dev->net) && val > ctx->tx_max) { |
| netif_tx_lock_bh(dev->net); |
| usbnet_start_xmit(NULL, dev->net); |
| ctx->tx_max = val; |
| netif_tx_unlock_bh(dev->net); |
| } else { |
| ctx->tx_max = val; |
| } |
| |
| dev->hard_mtu = ctx->tx_max; |
| |
| /* max qlen depend on hard_mtu and rx_urb_size */ |
| usbnet_update_max_qlen(dev); |
| } |
| |
| /* helpers for NCM and MBIM differences */ |
| static u8 cdc_ncm_flags(struct usbnet *dev) |
| { |
| struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; |
| |
| if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting) && ctx->mbim_desc) |
| return ctx->mbim_desc->bmNetworkCapabilities; |
| if (ctx->func_desc) |
| return ctx->func_desc->bmNetworkCapabilities; |
| return 0; |
| } |
| |
| static int cdc_ncm_eth_hlen(struct usbnet *dev) |
| { |
| if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting)) |
| return 0; |
| return ETH_HLEN; |
| } |
| |
| static u32 cdc_ncm_min_dgram_size(struct usbnet *dev) |
| { |
| if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting)) |
| return CDC_MBIM_MIN_DATAGRAM_SIZE; |
| return CDC_NCM_MIN_DATAGRAM_SIZE; |
| } |
| |
| static u32 cdc_ncm_max_dgram_size(struct usbnet *dev) |
| { |
| struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; |
| |
| if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting) && ctx->mbim_desc) |
| return le16_to_cpu(ctx->mbim_desc->wMaxSegmentSize); |
| if (ctx->ether_desc) |
| return le16_to_cpu(ctx->ether_desc->wMaxSegmentSize); |
| return CDC_NCM_MAX_DATAGRAM_SIZE; |
| } |
| |
| /* initial one-time device setup. MUST be called with the data interface |
| * in altsetting 0 |
| */ |
| static int cdc_ncm_init(struct usbnet *dev) |
| { |
| struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; |
| u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber; |
| int err; |
| |
| err = usbnet_read_cmd(dev, USB_CDC_GET_NTB_PARAMETERS, |
| USB_TYPE_CLASS | USB_DIR_IN |
| |USB_RECIP_INTERFACE, |
| 0, iface_no, &ctx->ncm_parm, |
| sizeof(ctx->ncm_parm)); |
| if (err < 0) { |
| dev_err(&dev->intf->dev, "failed GET_NTB_PARAMETERS\n"); |
| return err; /* GET_NTB_PARAMETERS is required */ |
| } |
| |
| /* set CRC Mode */ |
| if (cdc_ncm_flags(dev) & USB_CDC_NCM_NCAP_CRC_MODE) { |
| dev_dbg(&dev->intf->dev, "Setting CRC mode off\n"); |
| err = usbnet_write_cmd(dev, USB_CDC_SET_CRC_MODE, |
| USB_TYPE_CLASS | USB_DIR_OUT |
| | USB_RECIP_INTERFACE, |
| USB_CDC_NCM_CRC_NOT_APPENDED, |
| iface_no, NULL, 0); |
| if (err < 0) |
| dev_err(&dev->intf->dev, "SET_CRC_MODE failed\n"); |
| } |
| |
| /* set NTB format, if both formats are supported. |
| * |
| * "The host shall only send this command while the NCM Data |
| * Interface is in alternate setting 0." |
| */ |
| if (le16_to_cpu(ctx->ncm_parm.bmNtbFormatsSupported) & USB_CDC_NCM_NTH32_SIGN) { |
| dev_dbg(&dev->intf->dev, "Setting NTB format to 16-bit\n"); |
| err = usbnet_write_cmd(dev, USB_CDC_SET_NTB_FORMAT, |
| USB_TYPE_CLASS | USB_DIR_OUT |
| | USB_RECIP_INTERFACE, |
| USB_CDC_NCM_NTB16_FORMAT, |
| iface_no, NULL, 0); |
| if (err < 0) |
| dev_err(&dev->intf->dev, "SET_NTB_FORMAT failed\n"); |
| } |
| |
| /* set initial device values */ |
| ctx->rx_max = le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize); |
| ctx->tx_max = le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize); |
| ctx->tx_remainder = le16_to_cpu(ctx->ncm_parm.wNdpOutPayloadRemainder); |
| ctx->tx_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutDivisor); |
| ctx->tx_ndp_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutAlignment); |
| /* devices prior to NCM Errata shall set this field to zero */ |
| ctx->tx_max_datagrams = le16_to_cpu(ctx->ncm_parm.wNtbOutMaxDatagrams); |
| |
| dev_dbg(&dev->intf->dev, |
| "dwNtbInMaxSize=%u dwNtbOutMaxSize=%u wNdpOutPayloadRemainder=%u wNdpOutDivisor=%u wNdpOutAlignment=%u wNtbOutMaxDatagrams=%u flags=0x%x\n", |
| ctx->rx_max, ctx->tx_max, ctx->tx_remainder, ctx->tx_modulus, |
| ctx->tx_ndp_modulus, ctx->tx_max_datagrams, cdc_ncm_flags(dev)); |
| |
| /* max count of tx datagrams */ |
| if ((ctx->tx_max_datagrams == 0) || |
| (ctx->tx_max_datagrams > CDC_NCM_DPT_DATAGRAMS_MAX)) |
| ctx->tx_max_datagrams = CDC_NCM_DPT_DATAGRAMS_MAX; |
| |
| /* set up maximum NDP size */ |
| ctx->max_ndp_size = sizeof(struct usb_cdc_ncm_ndp16) + (ctx->tx_max_datagrams + 1) * sizeof(struct usb_cdc_ncm_dpe16); |
| |
| /* initial coalescing timer interval */ |
| ctx->timer_interval = CDC_NCM_TIMER_INTERVAL_USEC * NSEC_PER_USEC; |
| |
| return 0; |
| } |
| |
| /* set a new max datagram size */ |
| static void cdc_ncm_set_dgram_size(struct usbnet *dev, int new_size) |
| { |
| struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; |
| u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber; |
| __le16 max_datagram_size; |
| u16 mbim_mtu; |
| int err; |
| |
| /* set default based on descriptors */ |
| ctx->max_datagram_size = clamp_t(u32, new_size, |
| cdc_ncm_min_dgram_size(dev), |
| CDC_NCM_MAX_DATAGRAM_SIZE); |
| |
| /* inform the device about the selected Max Datagram Size? */ |
| if (!(cdc_ncm_flags(dev) & USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE)) |
| goto out; |
| |
| /* read current mtu value from device */ |
| err = usbnet_read_cmd(dev, USB_CDC_GET_MAX_DATAGRAM_SIZE, |
| USB_TYPE_CLASS | USB_DIR_IN | USB_RECIP_INTERFACE, |
| 0, iface_no, &max_datagram_size, 2); |
| if (err < 0) { |
| dev_dbg(&dev->intf->dev, "GET_MAX_DATAGRAM_SIZE failed\n"); |
| goto out; |
| } |
| |
| if (le16_to_cpu(max_datagram_size) == ctx->max_datagram_size) |
| goto out; |
| |
| max_datagram_size = cpu_to_le16(ctx->max_datagram_size); |
| err = usbnet_write_cmd(dev, USB_CDC_SET_MAX_DATAGRAM_SIZE, |
| USB_TYPE_CLASS | USB_DIR_OUT | USB_RECIP_INTERFACE, |
| 0, iface_no, &max_datagram_size, 2); |
| if (err < 0) |
| dev_dbg(&dev->intf->dev, "SET_MAX_DATAGRAM_SIZE failed\n"); |
| |
| out: |
| /* set MTU to max supported by the device if necessary */ |
| dev->net->mtu = min_t(int, dev->net->mtu, ctx->max_datagram_size - cdc_ncm_eth_hlen(dev)); |
| |
| /* do not exceed operater preferred MTU */ |
| if (ctx->mbim_extended_desc) { |
| mbim_mtu = le16_to_cpu(ctx->mbim_extended_desc->wMTU); |
| if (mbim_mtu != 0 && mbim_mtu < dev->net->mtu) |
| dev->net->mtu = mbim_mtu; |
| } |
| } |
| |
| static void cdc_ncm_fix_modulus(struct usbnet *dev) |
| { |
| struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; |
| u32 val; |
| |
| /* |
| * verify that the structure alignment is: |
| * - power of two |
| * - not greater than the maximum transmit length |
| * - not less than four bytes |
| */ |
| val = ctx->tx_ndp_modulus; |
| |
| if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) || |
| (val != ((-val) & val)) || (val >= ctx->tx_max)) { |
| dev_dbg(&dev->intf->dev, "Using default alignment: 4 bytes\n"); |
| ctx->tx_ndp_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE; |
| } |
| |
| /* |
| * verify that the payload alignment is: |
| * - power of two |
| * - not greater than the maximum transmit length |
| * - not less than four bytes |
| */ |
| val = ctx->tx_modulus; |
| |
| if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) || |
| (val != ((-val) & val)) || (val >= ctx->tx_max)) { |
| dev_dbg(&dev->intf->dev, "Using default transmit modulus: 4 bytes\n"); |
| ctx->tx_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE; |
| } |
| |
| /* verify the payload remainder */ |
| if (ctx->tx_remainder >= ctx->tx_modulus) { |
| dev_dbg(&dev->intf->dev, "Using default transmit remainder: 0 bytes\n"); |
| ctx->tx_remainder = 0; |
| } |
| |
| /* adjust TX-remainder according to NCM specification. */ |
| ctx->tx_remainder = ((ctx->tx_remainder - cdc_ncm_eth_hlen(dev)) & |
| (ctx->tx_modulus - 1)); |
| } |
| |
| static int cdc_ncm_setup(struct usbnet *dev) |
| { |
| struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; |
| |
| /* clamp rx_max and tx_max and inform device */ |
| cdc_ncm_update_rxtx_max(dev, le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize), |
| le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize)); |
| |
| /* sanitize the modulus and remainder values */ |
| cdc_ncm_fix_modulus(dev); |
| |
| /* set max datagram size */ |
| cdc_ncm_set_dgram_size(dev, cdc_ncm_max_dgram_size(dev)); |
| return 0; |
| } |
| |
| static void |
| cdc_ncm_find_endpoints(struct usbnet *dev, struct usb_interface *intf) |
| { |
| struct usb_host_endpoint *e, *in = NULL, *out = NULL; |
| u8 ep; |
| |
| for (ep = 0; ep < intf->cur_altsetting->desc.bNumEndpoints; ep++) { |
| |
| e = intf->cur_altsetting->endpoint + ep; |
| switch (e->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) { |
| case USB_ENDPOINT_XFER_INT: |
| if (usb_endpoint_dir_in(&e->desc)) { |
| if (!dev->status) |
| dev->status = e; |
| } |
| break; |
| |
| case USB_ENDPOINT_XFER_BULK: |
| if (usb_endpoint_dir_in(&e->desc)) { |
| if (!in) |
| in = e; |
| } else { |
| if (!out) |
| out = e; |
| } |
| break; |
| |
| default: |
| break; |
| } |
| } |
| if (in && !dev->in) |
| dev->in = usb_rcvbulkpipe(dev->udev, |
| in->desc.bEndpointAddress & |
| USB_ENDPOINT_NUMBER_MASK); |
| if (out && !dev->out) |
| dev->out = usb_sndbulkpipe(dev->udev, |
| out->desc.bEndpointAddress & |
| USB_ENDPOINT_NUMBER_MASK); |
| } |
| |
| static void cdc_ncm_free(struct cdc_ncm_ctx *ctx) |
| { |
| if (ctx == NULL) |
| return; |
| |
| if (ctx->tx_rem_skb != NULL) { |
| dev_kfree_skb_any(ctx->tx_rem_skb); |
| ctx->tx_rem_skb = NULL; |
| } |
| |
| if (ctx->tx_curr_skb != NULL) { |
| dev_kfree_skb_any(ctx->tx_curr_skb); |
| ctx->tx_curr_skb = NULL; |
| } |
| |
| kfree(ctx); |
| } |
| |
| int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_altsetting) |
| { |
| const struct usb_cdc_union_desc *union_desc = NULL; |
| struct cdc_ncm_ctx *ctx; |
| struct usb_driver *driver; |
| u8 *buf; |
| int len; |
| int temp; |
| u8 iface_no; |
| |
| ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); |
| if (!ctx) |
| return -ENOMEM; |
| |
| hrtimer_init(&ctx->tx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
| ctx->tx_timer.function = &cdc_ncm_tx_timer_cb; |
| ctx->bh.data = (unsigned long)dev; |
| ctx->bh.func = cdc_ncm_txpath_bh; |
| atomic_set(&ctx->stop, 0); |
| spin_lock_init(&ctx->mtx); |
| |
| /* store ctx pointer in device data field */ |
| dev->data[0] = (unsigned long)ctx; |
| |
| /* only the control interface can be successfully probed */ |
| ctx->control = intf; |
| |
| /* get some pointers */ |
| driver = driver_of(intf); |
| buf = intf->cur_altsetting->extra; |
| len = intf->cur_altsetting->extralen; |
| |
| /* parse through descriptors associated with control interface */ |
| while ((len > 0) && (buf[0] > 2) && (buf[0] <= len)) { |
| |
| if (buf[1] != USB_DT_CS_INTERFACE) |
| goto advance; |
| |
| switch (buf[2]) { |
| case USB_CDC_UNION_TYPE: |
| if (buf[0] < sizeof(*union_desc)) |
| break; |
| |
| union_desc = (const struct usb_cdc_union_desc *)buf; |
| /* the master must be the interface we are probing */ |
| if (intf->cur_altsetting->desc.bInterfaceNumber != |
| union_desc->bMasterInterface0) { |
| dev_dbg(&intf->dev, "bogus CDC Union\n"); |
| goto error; |
| } |
| ctx->data = usb_ifnum_to_if(dev->udev, |
| union_desc->bSlaveInterface0); |
| break; |
| |
| case USB_CDC_ETHERNET_TYPE: |
| if (buf[0] < sizeof(*(ctx->ether_desc))) |
| break; |
| |
| ctx->ether_desc = |
| (const struct usb_cdc_ether_desc *)buf; |
| break; |
| |
| case USB_CDC_NCM_TYPE: |
| if (buf[0] < sizeof(*(ctx->func_desc))) |
| break; |
| |
| ctx->func_desc = (const struct usb_cdc_ncm_desc *)buf; |
| break; |
| |
| case USB_CDC_MBIM_TYPE: |
| if (buf[0] < sizeof(*(ctx->mbim_desc))) |
| break; |
| |
| ctx->mbim_desc = (const struct usb_cdc_mbim_desc *)buf; |
| break; |
| |
| case USB_CDC_MBIM_EXTENDED_TYPE: |
| if (buf[0] < sizeof(*(ctx->mbim_extended_desc))) |
| break; |
| |
| ctx->mbim_extended_desc = |
| (const struct usb_cdc_mbim_extended_desc *)buf; |
| break; |
| |
| default: |
| break; |
| } |
| advance: |
| /* advance to next descriptor */ |
| temp = buf[0]; |
| buf += temp; |
| len -= temp; |
| } |
| |
| /* some buggy devices have an IAD but no CDC Union */ |
| if (!union_desc && intf->intf_assoc && intf->intf_assoc->bInterfaceCount == 2) { |
| ctx->data = usb_ifnum_to_if(dev->udev, intf->cur_altsetting->desc.bInterfaceNumber + 1); |
| dev_dbg(&intf->dev, "CDC Union missing - got slave from IAD\n"); |
| } |
| |
| /* check if we got everything */ |
| if (!ctx->data) { |
| dev_dbg(&intf->dev, "CDC Union missing and no IAD found\n"); |
| goto error; |
| } |
| if (cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting)) { |
| if (!ctx->mbim_desc) { |
| dev_dbg(&intf->dev, "MBIM functional descriptor missing\n"); |
| goto error; |
| } |
| } else { |
| if (!ctx->ether_desc || !ctx->func_desc) { |
| dev_dbg(&intf->dev, "NCM or ECM functional descriptors missing\n"); |
| goto error; |
| } |
| } |
| |
| /* claim data interface, if different from control */ |
| if (ctx->data != ctx->control) { |
| temp = usb_driver_claim_interface(driver, ctx->data, dev); |
| if (temp) { |
| dev_dbg(&intf->dev, "failed to claim data intf\n"); |
| goto error; |
| } |
| } |
| |
| iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber; |
| |
| /* reset data interface */ |
| temp = usb_set_interface(dev->udev, iface_no, 0); |
| if (temp) { |
| dev_dbg(&intf->dev, "set interface failed\n"); |
| goto error2; |
| } |
| |
| /* initialize basic device settings */ |
| if (cdc_ncm_init(dev)) |
| goto error2; |
| |
| /* configure data interface */ |
| temp = usb_set_interface(dev->udev, iface_no, data_altsetting); |
| if (temp) { |
| dev_dbg(&intf->dev, "set interface failed\n"); |
| goto error2; |
| } |
| |
| cdc_ncm_find_endpoints(dev, ctx->data); |
| cdc_ncm_find_endpoints(dev, ctx->control); |
| if (!dev->in || !dev->out || !dev->status) { |
| dev_dbg(&intf->dev, "failed to collect endpoints\n"); |
| goto error2; |
| } |
| |
| usb_set_intfdata(ctx->data, dev); |
| usb_set_intfdata(ctx->control, dev); |
| |
| if (ctx->ether_desc) { |
| temp = usbnet_get_ethernet_addr(dev, ctx->ether_desc->iMACAddress); |
| if (temp) { |
| dev_dbg(&intf->dev, "failed to get mac address\n"); |
| goto error2; |
| } |
| dev_info(&intf->dev, "MAC-Address: %pM\n", dev->net->dev_addr); |
| } |
| |
| /* finish setting up the device specific data */ |
| cdc_ncm_setup(dev); |
| |
| /* override ethtool_ops */ |
| dev->net->ethtool_ops = &cdc_ncm_ethtool_ops; |
| |
| return 0; |
| |
| error2: |
| usb_set_intfdata(ctx->control, NULL); |
| usb_set_intfdata(ctx->data, NULL); |
| if (ctx->data != ctx->control) |
| usb_driver_release_interface(driver, ctx->data); |
| error: |
| cdc_ncm_free((struct cdc_ncm_ctx *)dev->data[0]); |
| dev->data[0] = 0; |
| dev_info(&intf->dev, "bind() failure\n"); |
| return -ENODEV; |
| } |
| EXPORT_SYMBOL_GPL(cdc_ncm_bind_common); |
| |
| void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf) |
| { |
| struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; |
| struct usb_driver *driver = driver_of(intf); |
| |
| if (ctx == NULL) |
| return; /* no setup */ |
| |
| atomic_set(&ctx->stop, 1); |
| |
| if (hrtimer_active(&ctx->tx_timer)) |
| hrtimer_cancel(&ctx->tx_timer); |
| |
| tasklet_kill(&ctx->bh); |
| |
| /* handle devices with combined control and data interface */ |
| if (ctx->control == ctx->data) |
| ctx->data = NULL; |
| |
| /* disconnect master --> disconnect slave */ |
| if (intf == ctx->control && ctx->data) { |
| usb_set_intfdata(ctx->data, NULL); |
| usb_driver_release_interface(driver, ctx->data); |
| ctx->data = NULL; |
| |
| } else if (intf == ctx->data && ctx->control) { |
| usb_set_intfdata(ctx->control, NULL); |
| usb_driver_release_interface(driver, ctx->control); |
| ctx->control = NULL; |
| } |
| |
| usb_set_intfdata(intf, NULL); |
| cdc_ncm_free(ctx); |
| } |
| EXPORT_SYMBOL_GPL(cdc_ncm_unbind); |
| |
| /* Return the number of the MBIM control interface altsetting iff it |
| * is preferred and available, |
| */ |
| u8 cdc_ncm_select_altsetting(struct usb_interface *intf) |
| { |
| struct usb_host_interface *alt; |
| |
| /* The MBIM spec defines a NCM compatible default altsetting, |
| * which we may have matched: |
| * |
| * "Functions that implement both NCM 1.0 and MBIM (an |
| * “NCM/MBIM function”) according to this recommendation |
| * shall provide two alternate settings for the |
| * Communication Interface. Alternate setting 0, and the |
| * associated class and endpoint descriptors, shall be |
| * constructed according to the rules given for the |
| * Communication Interface in section 5 of [USBNCM10]. |
| * Alternate setting 1, and the associated class and |
| * endpoint descriptors, shall be constructed according to |
| * the rules given in section 6 (USB Device Model) of this |
| * specification." |
| */ |
| if (intf->num_altsetting < 2) |
| return intf->cur_altsetting->desc.bAlternateSetting; |
| |
| if (prefer_mbim) { |
| alt = usb_altnum_to_altsetting(intf, CDC_NCM_COMM_ALTSETTING_MBIM); |
| if (alt && cdc_ncm_comm_intf_is_mbim(alt)) |
| return CDC_NCM_COMM_ALTSETTING_MBIM; |
| } |
| return CDC_NCM_COMM_ALTSETTING_NCM; |
| } |
| EXPORT_SYMBOL_GPL(cdc_ncm_select_altsetting); |
| |
| static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf) |
| { |
| int ret; |
| |
| /* MBIM backwards compatible function? */ |
| if (cdc_ncm_select_altsetting(intf) != CDC_NCM_COMM_ALTSETTING_NCM) |
| return -ENODEV; |
| |
| /* The NCM data altsetting is fixed */ |
| ret = cdc_ncm_bind_common(dev, intf, CDC_NCM_DATA_ALTSETTING_NCM); |
| |
| /* |
| * We should get an event when network connection is "connected" or |
| * "disconnected". Set network connection in "disconnected" state |
| * (carrier is OFF) during attach, so the IP network stack does not |
| * start IPv6 negotiation and more. |
| */ |
| usbnet_link_change(dev, 0, 0); |
| return ret; |
| } |
| |
| static void cdc_ncm_align_tail(struct sk_buff *skb, size_t modulus, size_t remainder, size_t max) |
| { |
| size_t align = ALIGN(skb->len, modulus) - skb->len + remainder; |
| |
| if (skb->len + align > max) |
| align = max - skb->len; |
| if (align && skb_tailroom(skb) >= align) |
| memset(skb_put(skb, align), 0, align); |
| } |
| |
| /* return a pointer to a valid struct usb_cdc_ncm_ndp16 of type sign, possibly |
| * allocating a new one within skb |
| */ |
| static struct usb_cdc_ncm_ndp16 *cdc_ncm_ndp(struct cdc_ncm_ctx *ctx, struct sk_buff *skb, __le32 sign, size_t reserve) |
| { |
| struct usb_cdc_ncm_ndp16 *ndp16 = NULL; |
| struct usb_cdc_ncm_nth16 *nth16 = (void *)skb->data; |
| size_t ndpoffset = le16_to_cpu(nth16->wNdpIndex); |
| |
| /* follow the chain of NDPs, looking for a match */ |
| while (ndpoffset) { |
| ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb->data + ndpoffset); |
| if (ndp16->dwSignature == sign) |
| return ndp16; |
| ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex); |
| } |
| |
| /* align new NDP */ |
| cdc_ncm_align_tail(skb, ctx->tx_ndp_modulus, 0, ctx->tx_max); |
| |
| /* verify that there is room for the NDP and the datagram (reserve) */ |
| if ((ctx->tx_max - skb->len - reserve) < ctx->max_ndp_size) |
| return NULL; |
| |
| /* link to it */ |
| if (ndp16) |
| ndp16->wNextNdpIndex = cpu_to_le16(skb->len); |
| else |
| nth16->wNdpIndex = cpu_to_le16(skb->len); |
| |
| /* push a new empty NDP */ |
| ndp16 = (struct usb_cdc_ncm_ndp16 *)memset(skb_put(skb, ctx->max_ndp_size), 0, ctx->max_ndp_size); |
| ndp16->dwSignature = sign; |
| ndp16->wLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_ndp16) + sizeof(struct usb_cdc_ncm_dpe16)); |
| return ndp16; |
| } |
| |
| struct sk_buff * |
| cdc_ncm_fill_tx_frame(struct usbnet *dev, struct sk_buff *skb, __le32 sign) |
| { |
| struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; |
| struct usb_cdc_ncm_nth16 *nth16; |
| struct usb_cdc_ncm_ndp16 *ndp16; |
| struct sk_buff *skb_out; |
| u16 n = 0, index, ndplen; |
| u8 ready2send = 0; |
| |
| /* if there is a remaining skb, it gets priority */ |
| if (skb != NULL) { |
| swap(skb, ctx->tx_rem_skb); |
| swap(sign, ctx->tx_rem_sign); |
| } else { |
| ready2send = 1; |
| } |
| |
| /* check if we are resuming an OUT skb */ |
| skb_out = ctx->tx_curr_skb; |
| |
| /* allocate a new OUT skb */ |
| if (!skb_out) { |
| skb_out = alloc_skb(ctx->tx_max, GFP_ATOMIC); |
| if (skb_out == NULL) { |
| if (skb != NULL) { |
| dev_kfree_skb_any(skb); |
| dev->net->stats.tx_dropped++; |
| } |
| goto exit_no_skb; |
| } |
| /* fill out the initial 16-bit NTB header */ |
| nth16 = (struct usb_cdc_ncm_nth16 *)memset(skb_put(skb_out, sizeof(struct usb_cdc_ncm_nth16)), 0, sizeof(struct usb_cdc_ncm_nth16)); |
| nth16->dwSignature = cpu_to_le32(USB_CDC_NCM_NTH16_SIGN); |
| nth16->wHeaderLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_nth16)); |
| nth16->wSequence = cpu_to_le16(ctx->tx_seq++); |
| |
| /* count total number of frames in this NTB */ |
| ctx->tx_curr_frame_num = 0; |
| } |
| |
| for (n = ctx->tx_curr_frame_num; n < ctx->tx_max_datagrams; n++) { |
| /* send any remaining skb first */ |
| if (skb == NULL) { |
| skb = ctx->tx_rem_skb; |
| sign = ctx->tx_rem_sign; |
| ctx->tx_rem_skb = NULL; |
| |
| /* check for end of skb */ |
| if (skb == NULL) |
| break; |
| } |
| |
| /* get the appropriate NDP for this skb */ |
| ndp16 = cdc_ncm_ndp(ctx, skb_out, sign, skb->len + ctx->tx_modulus + ctx->tx_remainder); |
| |
| /* align beginning of next frame */ |
| cdc_ncm_align_tail(skb_out, ctx->tx_modulus, ctx->tx_remainder, ctx->tx_max); |
| |
| /* check if we had enough room left for both NDP and frame */ |
| if (!ndp16 || skb_out->len + skb->len > ctx->tx_max) { |
| if (n == 0) { |
| /* won't fit, MTU problem? */ |
| dev_kfree_skb_any(skb); |
| skb = NULL; |
| dev->net->stats.tx_dropped++; |
| } else { |
| /* no room for skb - store for later */ |
| if (ctx->tx_rem_skb != NULL) { |
| dev_kfree_skb_any(ctx->tx_rem_skb); |
| dev->net->stats.tx_dropped++; |
| } |
| ctx->tx_rem_skb = skb; |
| ctx->tx_rem_sign = sign; |
| skb = NULL; |
| ready2send = 1; |
| } |
| break; |
| } |
| |
| /* calculate frame number withing this NDP */ |
| ndplen = le16_to_cpu(ndp16->wLength); |
| index = (ndplen - sizeof(struct usb_cdc_ncm_ndp16)) / sizeof(struct usb_cdc_ncm_dpe16) - 1; |
| |
| /* OK, add this skb */ |
| ndp16->dpe16[index].wDatagramLength = cpu_to_le16(skb->len); |
| ndp16->dpe16[index].wDatagramIndex = cpu_to_le16(skb_out->len); |
| ndp16->wLength = cpu_to_le16(ndplen + sizeof(struct usb_cdc_ncm_dpe16)); |
| memcpy(skb_put(skb_out, skb->len), skb->data, skb->len); |
| dev_kfree_skb_any(skb); |
| skb = NULL; |
| |
| /* send now if this NDP is full */ |
| if (index >= CDC_NCM_DPT_DATAGRAMS_MAX) { |
| ready2send = 1; |
| break; |
| } |
| } |
| |
| /* free up any dangling skb */ |
| if (skb != NULL) { |
| dev_kfree_skb_any(skb); |
| skb = NULL; |
| dev->net->stats.tx_dropped++; |
| } |
| |
| ctx->tx_curr_frame_num = n; |
| |
| if (n == 0) { |
| /* wait for more frames */ |
| /* push variables */ |
| ctx->tx_curr_skb = skb_out; |
| goto exit_no_skb; |
| |
| } else if ((n < ctx->tx_max_datagrams) && (ready2send == 0) && (ctx->timer_interval > 0)) { |
| /* wait for more frames */ |
| /* push variables */ |
| ctx->tx_curr_skb = skb_out; |
| /* set the pending count */ |
| if (n < CDC_NCM_RESTART_TIMER_DATAGRAM_CNT) |
| ctx->tx_timer_pending = CDC_NCM_TIMER_PENDING_CNT; |
| goto exit_no_skb; |
| |
| } else { |
| /* frame goes out */ |
| /* variables will be reset at next call */ |
| } |
| |
| /* If collected data size is less or equal CDC_NCM_MIN_TX_PKT |
| * bytes, we send buffers as it is. If we get more data, it |
| * would be more efficient for USB HS mobile device with DMA |
| * engine to receive a full size NTB, than canceling DMA |
| * transfer and receiving a short packet. |
| * |
| * This optimization support is pointless if we end up sending |
| * a ZLP after full sized NTBs. |
| */ |
| if (!(dev->driver_info->flags & FLAG_SEND_ZLP) && |
| skb_out->len > CDC_NCM_MIN_TX_PKT) |
| memset(skb_put(skb_out, ctx->tx_max - skb_out->len), 0, |
| ctx->tx_max - skb_out->len); |
| else if (skb_out->len < ctx->tx_max && (skb_out->len % dev->maxpacket) == 0) |
| *skb_put(skb_out, 1) = 0; /* force short packet */ |
| |
| /* set final frame length */ |
| nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data; |
| nth16->wBlockLength = cpu_to_le16(skb_out->len); |
| |
| /* return skb */ |
| ctx->tx_curr_skb = NULL; |
| dev->net->stats.tx_packets += ctx->tx_curr_frame_num; |
| return skb_out; |
| |
| exit_no_skb: |
| /* Start timer, if there is a remaining skb */ |
| if (ctx->tx_curr_skb != NULL) |
| cdc_ncm_tx_timeout_start(ctx); |
| return NULL; |
| } |
| EXPORT_SYMBOL_GPL(cdc_ncm_fill_tx_frame); |
| |
| static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx) |
| { |
| /* start timer, if not already started */ |
| if (!(hrtimer_active(&ctx->tx_timer) || atomic_read(&ctx->stop))) |
| hrtimer_start(&ctx->tx_timer, |
| ktime_set(0, ctx->timer_interval), |
| HRTIMER_MODE_REL); |
| } |
| |
| static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *timer) |
| { |
| struct cdc_ncm_ctx *ctx = |
| container_of(timer, struct cdc_ncm_ctx, tx_timer); |
| |
| if (!atomic_read(&ctx->stop)) |
| tasklet_schedule(&ctx->bh); |
| return HRTIMER_NORESTART; |
| } |
| |
| static void cdc_ncm_txpath_bh(unsigned long param) |
| { |
| struct usbnet *dev = (struct usbnet *)param; |
| struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; |
| |
| spin_lock_bh(&ctx->mtx); |
| if (ctx->tx_timer_pending != 0) { |
| ctx->tx_timer_pending--; |
| cdc_ncm_tx_timeout_start(ctx); |
| spin_unlock_bh(&ctx->mtx); |
| } else if (dev->net != NULL) { |
| spin_unlock_bh(&ctx->mtx); |
| netif_tx_lock_bh(dev->net); |
| usbnet_start_xmit(NULL, dev->net); |
| netif_tx_unlock_bh(dev->net); |
| } else { |
| spin_unlock_bh(&ctx->mtx); |
| } |
| } |
| |
| struct sk_buff * |
| cdc_ncm_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags) |
| { |
| struct sk_buff *skb_out; |
| struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; |
| |
| /* |
| * The Ethernet API we are using does not support transmitting |
| * multiple Ethernet frames in a single call. This driver will |
| * accumulate multiple Ethernet frames and send out a larger |
| * USB frame when the USB buffer is full or when a single jiffies |
| * timeout happens. |
| */ |
| if (ctx == NULL) |
| goto error; |
| |
| spin_lock_bh(&ctx->mtx); |
| skb_out = cdc_ncm_fill_tx_frame(dev, skb, cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN)); |
| spin_unlock_bh(&ctx->mtx); |
| return skb_out; |
| |
| error: |
| if (skb != NULL) |
| dev_kfree_skb_any(skb); |
| |
| return NULL; |
| } |
| EXPORT_SYMBOL_GPL(cdc_ncm_tx_fixup); |
| |
| /* verify NTB header and return offset of first NDP, or negative error */ |
| int cdc_ncm_rx_verify_nth16(struct cdc_ncm_ctx *ctx, struct sk_buff *skb_in) |
| { |
| struct usbnet *dev = netdev_priv(skb_in->dev); |
| struct usb_cdc_ncm_nth16 *nth16; |
| int len; |
| int ret = -EINVAL; |
| |
| if (ctx == NULL) |
| goto error; |
| |
| if (skb_in->len < (sizeof(struct usb_cdc_ncm_nth16) + |
| sizeof(struct usb_cdc_ncm_ndp16))) { |
| netif_dbg(dev, rx_err, dev->net, "frame too short\n"); |
| goto error; |
| } |
| |
| nth16 = (struct usb_cdc_ncm_nth16 *)skb_in->data; |
| |
| if (nth16->dwSignature != cpu_to_le32(USB_CDC_NCM_NTH16_SIGN)) { |
| netif_dbg(dev, rx_err, dev->net, |
| "invalid NTH16 signature <%#010x>\n", |
| le32_to_cpu(nth16->dwSignature)); |
| goto error; |
| } |
| |
| len = le16_to_cpu(nth16->wBlockLength); |
| if (len > ctx->rx_max) { |
| netif_dbg(dev, rx_err, dev->net, |
| "unsupported NTB block length %u/%u\n", len, |
| ctx->rx_max); |
| goto error; |
| } |
| |
| if ((ctx->rx_seq + 1) != le16_to_cpu(nth16->wSequence) && |
| (ctx->rx_seq || le16_to_cpu(nth16->wSequence)) && |
| !((ctx->rx_seq == 0xffff) && !le16_to_cpu(nth16->wSequence))) { |
| netif_dbg(dev, rx_err, dev->net, |
| "sequence number glitch prev=%d curr=%d\n", |
| ctx->rx_seq, le16_to_cpu(nth16->wSequence)); |
| } |
| ctx->rx_seq = le16_to_cpu(nth16->wSequence); |
| |
| ret = le16_to_cpu(nth16->wNdpIndex); |
| error: |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_nth16); |
| |
| /* verify NDP header and return number of datagrams, or negative error */ |
| int cdc_ncm_rx_verify_ndp16(struct sk_buff *skb_in, int ndpoffset) |
| { |
| struct usbnet *dev = netdev_priv(skb_in->dev); |
| struct usb_cdc_ncm_ndp16 *ndp16; |
| int ret = -EINVAL; |
| |
| if ((ndpoffset + sizeof(struct usb_cdc_ncm_ndp16)) > skb_in->len) { |
| netif_dbg(dev, rx_err, dev->net, "invalid NDP offset <%u>\n", |
| ndpoffset); |
| goto error; |
| } |
| ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset); |
| |
| if (le16_to_cpu(ndp16->wLength) < USB_CDC_NCM_NDP16_LENGTH_MIN) { |
| netif_dbg(dev, rx_err, dev->net, "invalid DPT16 length <%u>\n", |
| le16_to_cpu(ndp16->wLength)); |
| goto error; |
| } |
| |
| ret = ((le16_to_cpu(ndp16->wLength) - |
| sizeof(struct usb_cdc_ncm_ndp16)) / |
| sizeof(struct usb_cdc_ncm_dpe16)); |
| ret--; /* we process NDP entries except for the last one */ |
| |
| if ((sizeof(struct usb_cdc_ncm_ndp16) + |
| ret * (sizeof(struct usb_cdc_ncm_dpe16))) > skb_in->len) { |
| netif_dbg(dev, rx_err, dev->net, "Invalid nframes = %d\n", ret); |
| ret = -EINVAL; |
| } |
| |
| error: |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_ndp16); |
| |
| int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in) |
| { |
| struct sk_buff *skb; |
| struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; |
| int len; |
| int nframes; |
| int x; |
| int offset; |
| struct usb_cdc_ncm_ndp16 *ndp16; |
| struct usb_cdc_ncm_dpe16 *dpe16; |
| int ndpoffset; |
| int loopcount = 50; /* arbitrary max preventing infinite loop */ |
| |
| ndpoffset = cdc_ncm_rx_verify_nth16(ctx, skb_in); |
| if (ndpoffset < 0) |
| goto error; |
| |
| next_ndp: |
| nframes = cdc_ncm_rx_verify_ndp16(skb_in, ndpoffset); |
| if (nframes < 0) |
| goto error; |
| |
| ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset); |
| |
| if (ndp16->dwSignature != cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN)) { |
| netif_dbg(dev, rx_err, dev->net, |
| "invalid DPT16 signature <%#010x>\n", |
| le32_to_cpu(ndp16->dwSignature)); |
| goto err_ndp; |
| } |
| dpe16 = ndp16->dpe16; |
| |
| for (x = 0; x < nframes; x++, dpe16++) { |
| offset = le16_to_cpu(dpe16->wDatagramIndex); |
| len = le16_to_cpu(dpe16->wDatagramLength); |
| |
| /* |
| * CDC NCM ch. 3.7 |
| * All entries after first NULL entry are to be ignored |
| */ |
| if ((offset == 0) || (len == 0)) { |
| if (!x) |
| goto err_ndp; /* empty NTB */ |
| break; |
| } |
| |
| /* sanity checking */ |
| if (((offset + len) > skb_in->len) || |
| (len > ctx->rx_max) || (len < ETH_HLEN)) { |
| 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 = skb_clone(skb_in, GFP_ATOMIC); |
| if (!skb) |
| goto error; |
| skb->len = len; |
| skb->data = ((u8 *)skb_in->data) + offset; |
| skb_set_tail_pointer(skb, len); |
| usbnet_skb_return(dev, skb); |
| } |
| } |
| err_ndp: |
| /* are there more NDPs to process? */ |
| ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex); |
| if (ndpoffset && loopcount--) |
| goto next_ndp; |
| |
| return 1; |
| error: |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(cdc_ncm_rx_fixup); |
| |
| static void |
| cdc_ncm_speed_change(struct usbnet *dev, |
| struct usb_cdc_speed_change *data) |
| { |
| uint32_t rx_speed = le32_to_cpu(data->DLBitRRate); |
| uint32_t tx_speed = le32_to_cpu(data->ULBitRate); |
| |
| /* |
| * Currently the USB-NET API does not support reporting the actual |
| * device speed. Do print it instead. |
| */ |
| if ((tx_speed > 1000000) && (rx_speed > 1000000)) { |
| netif_info(dev, link, dev->net, |
| "%u mbit/s downlink %u mbit/s uplink\n", |
| (unsigned int)(rx_speed / 1000000U), |
| (unsigned int)(tx_speed / 1000000U)); |
| } else { |
| netif_info(dev, link, dev->net, |
| "%u kbit/s downlink %u kbit/s uplink\n", |
| (unsigned int)(rx_speed / 1000U), |
| (unsigned int)(tx_speed / 1000U)); |
| } |
| } |
| |
| static void cdc_ncm_status(struct usbnet *dev, struct urb *urb) |
| { |
| struct cdc_ncm_ctx *ctx; |
| struct usb_cdc_notification *event; |
| |
| ctx = (struct cdc_ncm_ctx *)dev->data[0]; |
| |
| if (urb->actual_length < sizeof(*event)) |
| return; |
| |
| /* test for split data in 8-byte chunks */ |
| if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) { |
| cdc_ncm_speed_change(dev, |
| (struct usb_cdc_speed_change *)urb->transfer_buffer); |
| return; |
| } |
| |
| event = urb->transfer_buffer; |
| |
| switch (event->bNotificationType) { |
| case USB_CDC_NOTIFY_NETWORK_CONNECTION: |
| /* |
| * According to the CDC NCM specification ch.7.1 |
| * USB_CDC_NOTIFY_NETWORK_CONNECTION notification shall be |
| * sent by device after USB_CDC_NOTIFY_SPEED_CHANGE. |
| */ |
| ctx->connected = le16_to_cpu(event->wValue); |
| netif_info(dev, link, dev->net, |
| "network connection: %sconnected\n", |
| ctx->connected ? "" : "dis"); |
| usbnet_link_change(dev, ctx->connected, 0); |
| break; |
| |
| case USB_CDC_NOTIFY_SPEED_CHANGE: |
| if (urb->actual_length < (sizeof(*event) + |
| sizeof(struct usb_cdc_speed_change))) |
| set_bit(EVENT_STS_SPLIT, &dev->flags); |
| else |
| cdc_ncm_speed_change(dev, |
| (struct usb_cdc_speed_change *)&event[1]); |
| break; |
| |
| default: |
| dev_dbg(&dev->udev->dev, |
| "NCM: unexpected notification 0x%02x!\n", |
| event->bNotificationType); |
| break; |
| } |
| } |
| |
| static int cdc_ncm_check_connect(struct usbnet *dev) |
| { |
| struct cdc_ncm_ctx *ctx; |
| |
| ctx = (struct cdc_ncm_ctx *)dev->data[0]; |
| if (ctx == NULL) |
| return 1; /* disconnected */ |
| |
| return !ctx->connected; |
| } |
| |
| static const struct driver_info cdc_ncm_info = { |
| .description = "CDC NCM", |
| .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET, |
| .bind = cdc_ncm_bind, |
| .unbind = cdc_ncm_unbind, |
| .check_connect = cdc_ncm_check_connect, |
| .manage_power = usbnet_manage_power, |
| .status = cdc_ncm_status, |
| .rx_fixup = cdc_ncm_rx_fixup, |
| .tx_fixup = cdc_ncm_tx_fixup, |
| }; |
| |
| /* Same as cdc_ncm_info, but with FLAG_WWAN */ |
| static const struct driver_info wwan_info = { |
| .description = "Mobile Broadband Network Device", |
| .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET |
| | FLAG_WWAN, |
| .bind = cdc_ncm_bind, |
| .unbind = cdc_ncm_unbind, |
| .check_connect = cdc_ncm_check_connect, |
| .manage_power = usbnet_manage_power, |
| .status = cdc_ncm_status, |
| .rx_fixup = cdc_ncm_rx_fixup, |
| .tx_fixup = cdc_ncm_tx_fixup, |
| }; |
| |
| /* Same as wwan_info, but with FLAG_NOARP */ |
| static const struct driver_info wwan_noarp_info = { |
| .description = "Mobile Broadband Network Device (NO ARP)", |
| .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET |
| | FLAG_WWAN | FLAG_NOARP, |
| .bind = cdc_ncm_bind, |
| .unbind = cdc_ncm_unbind, |
| .check_connect = cdc_ncm_check_connect, |
| .manage_power = usbnet_manage_power, |
| .status = cdc_ncm_status, |
| .rx_fixup = cdc_ncm_rx_fixup, |
| .tx_fixup = cdc_ncm_tx_fixup, |
| }; |
| |
| static const struct usb_device_id cdc_devs[] = { |
| /* Ericsson MBM devices like F5521gw */ |
| { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO |
| | USB_DEVICE_ID_MATCH_VENDOR, |
| .idVendor = 0x0bdb, |
| .bInterfaceClass = USB_CLASS_COMM, |
| .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM, |
| .bInterfaceProtocol = USB_CDC_PROTO_NONE, |
| .driver_info = (unsigned long) &wwan_info, |
| }, |
| |
| /* Dell branded MBM devices like DW5550 */ |
| { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO |
| | USB_DEVICE_ID_MATCH_VENDOR, |
| .idVendor = 0x413c, |
| .bInterfaceClass = USB_CLASS_COMM, |
| .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM, |
| .bInterfaceProtocol = USB_CDC_PROTO_NONE, |
| .driver_info = (unsigned long) &wwan_info, |
| }, |
| |
| /* Toshiba branded MBM devices */ |
| { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO |
| | USB_DEVICE_ID_MATCH_VENDOR, |
| .idVendor = 0x0930, |
| .bInterfaceClass = USB_CLASS_COMM, |
| .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM, |
| .bInterfaceProtocol = USB_CDC_PROTO_NONE, |
| .driver_info = (unsigned long) &wwan_info, |
| }, |
| |
| /* tag Huawei devices as wwan */ |
| { USB_VENDOR_AND_INTERFACE_INFO(0x12d1, |
| USB_CLASS_COMM, |
| USB_CDC_SUBCLASS_NCM, |
| USB_CDC_PROTO_NONE), |
| .driver_info = (unsigned long)&wwan_info, |
| }, |
| |
| /* Infineon(now Intel) HSPA Modem platform */ |
| { USB_DEVICE_AND_INTERFACE_INFO(0x1519, 0x0443, |
| USB_CLASS_COMM, |
| USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE), |
| .driver_info = (unsigned long)&wwan_noarp_info, |
| }, |
| |
| /* Generic CDC-NCM devices */ |
| { USB_INTERFACE_INFO(USB_CLASS_COMM, |
| USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE), |
| .driver_info = (unsigned long)&cdc_ncm_info, |
| }, |
| { |
| }, |
| }; |
| MODULE_DEVICE_TABLE(usb, cdc_devs); |
| |
| static struct usb_driver cdc_ncm_driver = { |
| .name = "cdc_ncm", |
| .id_table = cdc_devs, |
| .probe = usbnet_probe, |
| .disconnect = usbnet_disconnect, |
| .suspend = usbnet_suspend, |
| .resume = usbnet_resume, |
| .reset_resume = usbnet_resume, |
| .supports_autosuspend = 1, |
| .disable_hub_initiated_lpm = 1, |
| }; |
| |
| module_usb_driver(cdc_ncm_driver); |
| |
| MODULE_AUTHOR("Hans Petter Selasky"); |
| MODULE_DESCRIPTION("USB CDC NCM host driver"); |
| MODULE_LICENSE("Dual BSD/GPL"); |