diff options
Diffstat (limited to 'drivers/net/usb/cdc_ncm.c')
| -rw-r--r-- | drivers/net/usb/cdc_ncm.c | 1213 |
1 files changed, 1213 insertions, 0 deletions
diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c new file mode 100644 index 000000000000..593c104ab199 --- /dev/null +++ b/drivers/net/usb/cdc_ncm.c @@ -0,0 +1,1213 @@ +/* + * cdc_ncm.c + * + * Copyright (C) ST-Ericsson 2010 + * 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/init.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/version.h> +#include <linux/timer.h> +#include <linux/spinlock.h> +#include <linux/atomic.h> +#include <linux/usb/usbnet.h> +#include <linux/usb/cdc.h> + +#define DRIVER_VERSION "30-Nov-2010" + +/* CDC NCM subclass 3.2.1 */ +#define USB_CDC_NCM_NDP16_LENGTH_MIN 0x10 + +/* Maximum NTB length */ +#define CDC_NCM_NTB_MAX_SIZE_TX 16384 /* bytes */ +#define CDC_NCM_NTB_MAX_SIZE_RX 16384 /* bytes */ + +/* Minimum value for MaxDatagramSize, ch. 6.2.9 */ +#define CDC_NCM_MIN_DATAGRAM_SIZE 1514 /* bytes */ + +#define CDC_NCM_MIN_TX_PKT 512 /* bytes */ + +/* Default value for MaxDatagramSize */ +#define CDC_NCM_MAX_DATAGRAM_SIZE 2048 /* bytes */ + +/* + * Maximum amount of datagrams in NCM Datagram Pointer Table, not counting + * the last NULL entry. Any additional datagrams in NTB would be discarded. + */ +#define CDC_NCM_DPT_DATAGRAMS_MAX 32 + +/* Restart the timer, if amount of datagrams is less than given value */ +#define CDC_NCM_RESTART_TIMER_DATAGRAM_CNT 3 + +/* The following macro defines the minimum header space */ +#define CDC_NCM_MIN_HDR_SIZE \ + (sizeof(struct usb_cdc_ncm_nth16) + sizeof(struct usb_cdc_ncm_ndp16) + \ + (CDC_NCM_DPT_DATAGRAMS_MAX + 1) * sizeof(struct usb_cdc_ncm_dpe16)) + +struct connection_speed_change { + __le32 USBitRate; /* holds 3GPP downlink value, bits per second */ + __le32 DSBitRate; /* holds 3GPP uplink value, bits per second */ +} __attribute__ ((packed)); + +struct cdc_ncm_data { + struct usb_cdc_ncm_nth16 nth16; + struct usb_cdc_ncm_ndp16 ndp16; + struct usb_cdc_ncm_dpe16 dpe16[CDC_NCM_DPT_DATAGRAMS_MAX + 1]; +}; + +struct cdc_ncm_ctx { + struct cdc_ncm_data rx_ncm; + struct cdc_ncm_data tx_ncm; + struct usb_cdc_ncm_ntb_parameters ncm_parm; + struct timer_list tx_timer; + + const struct usb_cdc_ncm_desc *func_desc; + const struct usb_cdc_header_desc *header_desc; + const struct usb_cdc_union_desc *union_desc; + const struct usb_cdc_ether_desc *ether_desc; + + struct net_device *netdev; + struct usb_device *udev; + struct usb_host_endpoint *in_ep; + struct usb_host_endpoint *out_ep; + struct usb_host_endpoint *status_ep; + struct usb_interface *intf; + struct usb_interface *control; + struct usb_interface *data; + + struct sk_buff *tx_curr_skb; + struct sk_buff *tx_rem_skb; + + spinlock_t mtx; + + u32 tx_timer_pending; + u32 tx_curr_offset; + u32 tx_curr_last_offset; + u32 tx_curr_frame_num; + u32 rx_speed; + u32 tx_speed; + u32 rx_max; + u32 tx_max; + u32 max_datagram_size; + u16 tx_max_datagrams; + u16 tx_remainder; + u16 tx_modulus; + u16 tx_ndp_modulus; + u16 tx_seq; + u16 connected; + u8 data_claimed; + u8 control_claimed; +}; + +static void cdc_ncm_tx_timeout(unsigned long arg); +static const struct driver_info cdc_ncm_info; +static struct usb_driver cdc_ncm_driver; +static struct ethtool_ops cdc_ncm_ethtool_ops; + +static const struct usb_device_id cdc_devs[] = { + { 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 void +cdc_ncm_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *info) +{ + struct usbnet *dev = netdev_priv(net); + + strncpy(info->driver, dev->driver_name, sizeof(info->driver)); + strncpy(info->version, DRIVER_VERSION, sizeof(info->version)); + strncpy(info->fw_version, dev->driver_info->description, + sizeof(info->fw_version)); + usb_make_path(dev->udev, info->bus_info, sizeof(info->bus_info)); +} + +static int +cdc_ncm_do_request(struct cdc_ncm_ctx *ctx, struct usb_cdc_notification *req, + void *data, u16 flags, u16 *actlen, u16 timeout) +{ + int err; + + err = usb_control_msg(ctx->udev, (req->bmRequestType & USB_DIR_IN) ? + usb_rcvctrlpipe(ctx->udev, 0) : + usb_sndctrlpipe(ctx->udev, 0), + req->bNotificationType, req->bmRequestType, + req->wValue, + req->wIndex, data, + req->wLength, timeout); + + if (err < 0) { + if (actlen) + *actlen = 0; + return err; + } + + if (actlen) + *actlen = err; + + return 0; +} + +static u8 cdc_ncm_setup(struct cdc_ncm_ctx *ctx) +{ + struct usb_cdc_notification req; + u32 val; + __le16 max_datagram_size; + u8 flags; + u8 iface_no; + int err; + + iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber; + + req.bmRequestType = USB_TYPE_CLASS | USB_DIR_IN | USB_RECIP_INTERFACE; + req.bNotificationType = USB_CDC_GET_NTB_PARAMETERS; + req.wValue = 0; + req.wIndex = cpu_to_le16(iface_no); + req.wLength = cpu_to_le16(sizeof(ctx->ncm_parm)); + + err = cdc_ncm_do_request(ctx, &req, &ctx->ncm_parm, 0, NULL, 1000); + if (err) { + pr_debug("failed GET_NTB_PARAMETERS\n"); + return 1; + } + + /* read correct set of parameters according to device mode */ + 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); + + if (ctx->func_desc != NULL) + flags = ctx->func_desc->bmNetworkCapabilities; + else + flags = 0; + + pr_debug("dwNtbInMaxSize=%u dwNtbOutMaxSize=%u " + "wNdpOutPayloadRemainder=%u wNdpOutDivisor=%u " + "wNdpOutAlignment=%u flags=0x%x\n", + ctx->rx_max, ctx->tx_max, ctx->tx_remainder, ctx->tx_modulus, + ctx->tx_ndp_modulus, flags); + + /* max count of tx datagrams without terminating NULL entry */ + ctx->tx_max_datagrams = CDC_NCM_DPT_DATAGRAMS_MAX; + + /* verify maximum size of received NTB in bytes */ + if ((ctx->rx_max < + (CDC_NCM_MIN_HDR_SIZE + CDC_NCM_MIN_DATAGRAM_SIZE)) || + (ctx->rx_max > CDC_NCM_NTB_MAX_SIZE_RX)) { + pr_debug("Using default maximum receive length=%d\n", + CDC_NCM_NTB_MAX_SIZE_RX); + ctx->rx_max = CDC_NCM_NTB_MAX_SIZE_RX; + } + + /* verify maximum size of transmitted NTB in bytes */ + if ((ctx->tx_max < + (CDC_NCM_MIN_HDR_SIZE + CDC_NCM_MIN_DATAGRAM_SIZE)) || + (ctx->tx_max > CDC_NCM_NTB_MAX_SIZE_TX)) { + pr_debug("Using default maximum transmit length=%d\n", + CDC_NCM_NTB_MAX_SIZE_TX); + ctx->tx_max = CDC_NCM_NTB_MAX_SIZE_TX; + } + + /* + * 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)) { + pr_debug("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)) { + pr_debug("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) { + pr_debug("Using default transmit remainder: 0 bytes\n"); + ctx->tx_remainder = 0; + } + + /* adjust TX-remainder according to NCM specification. */ + ctx->tx_remainder = ((ctx->tx_remainder - ETH_HLEN) & + (ctx->tx_modulus - 1)); + + /* additional configuration */ + + /* set CRC Mode */ + req.bmRequestType = USB_TYPE_CLASS | USB_DIR_OUT | USB_RECIP_INTERFACE; + req.bNotificationType = USB_CDC_SET_CRC_MODE; + req.wValue = cpu_to_le16(USB_CDC_NCM_CRC_NOT_APPENDED); + req.wIndex = cpu_to_le16(iface_no); + req.wLength = 0; + + err = cdc_ncm_do_request(ctx, &req, NULL, 0, NULL, 1000); + if (err) + pr_debug("Setting CRC mode off failed\n"); + + /* set NTB format */ + req.bmRequestType = USB_TYPE_CLASS | USB_DIR_OUT | USB_RECIP_INTERFACE; + req.bNotificationType = USB_CDC_SET_NTB_FORMAT; + req.wValue = cpu_to_le16(USB_CDC_NCM_NTB16_FORMAT); + req.wIndex = cpu_to_le16(iface_no); + req.wLength = 0; + + err = cdc_ncm_do_request(ctx, &req, NULL, 0, NULL, 1000); + if (err) + pr_debug("Setting NTB format to 16-bit failed\n"); + + /* set Max Datagram Size (MTU) */ + req.bmRequestType = USB_TYPE_CLASS | USB_DIR_IN | USB_RECIP_INTERFACE; + req.bNotificationType = USB_CDC_GET_MAX_DATAGRAM_SIZE; + req.wValue = 0; + req.wIndex = cpu_to_le16(iface_no); + req.wLength = cpu_to_le16(2); + + err = cdc_ncm_do_request(ctx, &req, &max_datagram_size, 0, NULL, 1000); + if (err) { + pr_debug(" GET_MAX_DATAGRAM_SIZE failed, using size=%u\n", + CDC_NCM_MIN_DATAGRAM_SIZE); + /* use default */ + ctx->max_datagram_size = CDC_NCM_MIN_DATAGRAM_SIZE; + } else { + ctx->max_datagram_size = le16_to_cpu(max_datagram_size); + + if (ctx->max_datagram_size < CDC_NCM_MIN_DATAGRAM_SIZE) + ctx->max_datagram_size = CDC_NCM_MIN_DATAGRAM_SIZE; + else if (ctx->max_datagram_size > CDC_NCM_MAX_DATAGRAM_SIZE) + ctx->max_datagram_size = CDC_NCM_MAX_DATAGRAM_SIZE; + } + + if (ctx->netdev->mtu != (ctx->max_datagram_size - ETH_HLEN)) + ctx->netdev->mtu = ctx->max_datagram_size - ETH_HLEN; + + return 0; +} + +static void +cdc_ncm_find_endpoints(struct cdc_ncm_ctx *ctx, struct usb_interface *intf) +{ + struct usb_host_endpoint *e; + 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 (ctx->status_ep == NULL) + ctx->status_ep = e; + } + break; + + case USB_ENDPOINT_XFER_BULK: + if (usb_endpoint_dir_in(&e->desc)) { + if (ctx->in_ep == NULL) + ctx->in_ep = e; + } else { + if (ctx->out_ep == NULL) + ctx->out_ep = e; + } + break; + + default: + break; + } + } +} + +static void cdc_ncm_free(struct cdc_ncm_ctx *ctx) +{ + if (ctx == NULL) + return; + + del_timer_sync(&ctx->tx_timer); + + if (ctx->data_claimed) { + usb_set_intfdata(ctx->data, NULL); + usb_driver_release_interface(driver_of(ctx->intf), ctx->data); + } + + if (ctx->control_claimed) { + usb_set_intfdata(ctx->control, NULL); + usb_driver_release_interface(driver_of(ctx->intf), + ctx->control); + } + + 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); +} + +static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf) +{ + struct cdc_ncm_ctx *ctx; + struct usb_driver *driver; + u8 *buf; + int len; + int temp; + u8 iface_no; + + ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); + if (ctx == NULL) + goto error; + + memset(ctx, 0, sizeof(*ctx)); + + init_timer(&ctx->tx_timer); + spin_lock_init(&ctx->mtx); + ctx->netdev = dev->net; + + /* store ctx pointer in device data field */ + dev->data[0] = (unsigned long)ctx; + + /* get some pointers */ + driver = driver_of(intf); + buf = intf->cur_altsetting->extra; + len = intf->cur_altsetting->extralen; + + ctx->udev = dev->udev; + ctx->intf = intf; + + /* 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(*(ctx->union_desc))) + break; + + ctx->union_desc = + (const struct usb_cdc_union_desc *)buf; + + ctx->control = usb_ifnum_to_if(dev->udev, + ctx->union_desc->bMasterInterface0); + ctx->data = usb_ifnum_to_if(dev->udev, + ctx->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; + + dev->hard_mtu = + le16_to_cpu(ctx->ether_desc->wMaxSegmentSize); + + if (dev->hard_mtu < + (CDC_NCM_MIN_DATAGRAM_SIZE - ETH_HLEN)) + dev->hard_mtu = + CDC_NCM_MIN_DATAGRAM_SIZE - ETH_HLEN; + + else if (dev->hard_mtu > + (CDC_NCM_MAX_DATAGRAM_SIZE - ETH_HLEN)) + dev->hard_mtu = + CDC_NCM_MAX_DATAGRAM_SIZE - ETH_HLEN; + 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; + + default: + break; + } +advance: + /* advance to next descriptor */ + temp = buf[0]; + buf += temp; + len -= temp; + } + + /* check if we got everything */ + if ((ctx->control == NULL) || (ctx->data == NULL) || + (ctx->ether_desc == NULL)) + goto error; + + /* claim interfaces, if any */ + if (ctx->data != intf) { + temp = usb_driver_claim_interface(driver, ctx->data, dev); + if (temp) + goto error; + ctx->data_claimed = 1; + } + + if (ctx->control != intf) { + temp = usb_driver_claim_interface(driver, ctx->control, dev); + if (temp) + goto error; + ctx->control_claimed = 1; + } + + iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber; + + /* reset data interface */ + temp = usb_set_interface(dev->udev, iface_no, 0); + if (temp) + goto error; + + /* initialize data interface */ + if (cdc_ncm_setup(ctx)) + goto error; + + /* configure data interface */ + temp = usb_set_interface(dev->udev, iface_no, 1); + if (temp) + goto error; + + cdc_ncm_find_endpoints(ctx, ctx->data); + cdc_ncm_find_endpoints(ctx, ctx->control); + + if ((ctx->in_ep == NULL) || (ctx->out_ep == NULL) || + (ctx->status_ep == NULL)) + goto error; + + dev->net->ethtool_ops = &cdc_ncm_ethtool_ops; + + usb_set_intfdata(ctx->data, dev); + usb_set_intfdata(ctx->control, dev); + usb_set_intfdata(ctx->intf, dev); + + temp = usbnet_get_ethernet_addr(dev, ctx->ether_desc->iMACAddress); + if (temp) + goto error; + + dev_info(&dev->udev->dev, "MAC-Address: " + "0x%02x:0x%02x:0x%02x:0x%02x:0x%02x:0x%02x\n", + dev->net->dev_addr[0], dev->net->dev_addr[1], + dev->net->dev_addr[2], dev->net->dev_addr[3], + dev->net->dev_addr[4], dev->net->dev_addr[5]); + + dev->in = usb_rcvbulkpipe(dev->udev, + ctx->in_ep->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); + dev->out = usb_sndbulkpipe(dev->udev, + ctx->out_ep->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); + dev->status = ctx->status_ep; + dev->rx_urb_size = ctx->rx_max; + + /* + * 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. + */ + netif_carrier_off(dev->net); + ctx->tx_speed = ctx->rx_speed = 0; + return 0; + +error: + cdc_ncm_free((struct cdc_ncm_ctx *)dev->data[0]); + dev->data[0] = 0; + dev_info(&dev->udev->dev, "Descriptor failure\n"); + return -ENODEV; +} + +static 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; + + if (ctx == NULL) + return; /* no setup */ + + driver = driver_of(intf); + + usb_set_intfdata(ctx->data, NULL); + usb_set_intfdata(ctx->control, NULL); + usb_set_intfdata(ctx->intf, NULL); + + /* release interfaces, if any */ + if (ctx->data_claimed) { + usb_driver_release_interface(driver, ctx->data); + ctx->data_claimed = 0; + } + + if (ctx->control_claimed) { + usb_driver_release_interface(driver, ctx->control); + ctx->control_claimed = 0; + } + + cdc_ncm_free(ctx); +} + +static void cdc_ncm_zero_fill(u8 *ptr, u32 first, u32 end, u32 max) +{ + if (first >= max) + return; + if (first >= end) + return; + if (end > max) + end = max; + memset(ptr + first, 0, end - first); +} + +static struct sk_buff * +cdc_ncm_fill_tx_frame(struct cdc_ncm_ctx *ctx, struct sk_buff *skb) +{ + struct sk_buff *skb_out; + u32 rem; + u32 offset; + u32 last_offset; + u16 n = 0; + u8 timeout = 0; + + /* if there is a remaining skb, it gets priority */ + if (skb != NULL) + swap(skb, ctx->tx_rem_skb); + else + timeout = 1; + + /* + * +----------------+ + * | skb_out | + * +----------------+ + * ^ offset + * ^ last_offset + */ + + /* check if we are resuming an OUT skb */ + if (ctx->tx_curr_skb != NULL) { + /* pop variables */ + skb_out = ctx->tx_curr_skb; + offset = ctx->tx_curr_offset; + last_offset = ctx->tx_curr_last_offset; + n = ctx->tx_curr_frame_num; + + } else { + /* reset variables */ + skb_out = alloc_skb(ctx->tx_max, GFP_ATOMIC); + if (skb_out == NULL) { + if (skb != NULL) { + dev_kfree_skb_any(skb); + ctx->netdev->stats.tx_dropped++; + } + goto exit_no_skb; + } + + /* make room for NTH and NDP */ + offset = ALIGN(sizeof(struct usb_cdc_ncm_nth16), + ctx->tx_ndp_modulus) + + sizeof(struct usb_cdc_ncm_ndp16) + + (ctx->tx_max_datagrams + 1) * + sizeof(struct usb_cdc_ncm_dpe16); + + /* store last valid offset before alignment */ + last_offset = offset; + /* align first Datagram offset correctly */ + offset = ALIGN(offset, ctx->tx_modulus) + ctx->tx_remainder; + /* zero buffer till the first IP datagram */ + cdc_ncm_zero_fill(skb_out->data, 0, offset, offset); + n = 0; + ctx->tx_curr_frame_num = 0; + } + + for (; n < ctx->tx_max_datagrams; n++) { + /* check if end of transmit buffer is reached */ + if (offset >= ctx->tx_max) + break; + + /* compute maximum buffer size */ + rem = ctx->tx_max - offset; + + if (skb == NULL) { + skb = ctx->tx_rem_skb; + ctx->tx_rem_skb = NULL; + + /* check for end of skb */ + if (skb == NULL) + break; + } + + if (skb->len > rem) { + if (n == 0) { + /* won't fit, MTU problem? */ + dev_kfree_skb_any(skb); + skb = NULL; + ctx->netdev->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); + ctx->netdev->stats.tx_dropped++; + } + ctx->tx_rem_skb = skb; + skb = NULL; + + /* loop one more time */ + timeout = 1; + } + break; + } + + memcpy(((u8 *)skb_out->data) + offset, skb->data, skb->len); + + ctx->tx_ncm.dpe16[n].wDatagramLength = cpu_to_le16(skb->len); + ctx->tx_ncm.dpe16[n].wDatagramIndex = cpu_to_le16(offset); + + /* update offset */ + offset += skb->len; + + /* store last valid offset before alignment */ + last_offset = offset; + + /* align offset correctly */ + offset = ALIGN(offset, ctx->tx_modulus) + ctx->tx_remainder; + + /* zero padding */ + cdc_ncm_zero_fill(skb_out->data, last_offset, offset, + ctx->tx_max); + dev_kfree_skb_any(skb); + skb = NULL; + } + + /* free up any dangling skb */ + if (skb != NULL) { + dev_kfree_skb_any(skb); + skb = NULL; + ctx->netdev->stats.tx_dropped++; + } + + ctx->tx_curr_frame_num = n; + + if (n == 0) { + /* wait for more frames */ + /* push variables */ + ctx->tx_curr_skb = skb_out; + ctx->tx_curr_offset = offset; + ctx->tx_curr_last_offset = last_offset; + goto exit_no_skb; + + } else if ((n < ctx->tx_max_datagrams) && (timeout == 0)) { + /* wait for more frames */ + /* push variables */ + ctx->tx_curr_skb = skb_out; + ctx->tx_curr_offset = offset; + ctx->tx_curr_last_offset = last_offset; + /* set the pending count */ + if (n < CDC_NCM_RESTART_TIMER_DATAGRAM_CNT) + ctx->tx_timer_pending = 2; + goto exit_no_skb; + + } else { + /* frame goes out */ + /* variables will be reset at next call */ + } + + /* check for overflow */ + if (last_offset > ctx->tx_max) + last_offset = ctx->tx_max; + + /* revert offset */ + offset = last_offset; + + /* + * 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. + */ + if (offset > CDC_NCM_MIN_TX_PKT) + offset = ctx->tx_max; + + /* final zero padding */ + cdc_ncm_zero_fill(skb_out->data, last_offset, offset, ctx->tx_max); + + /* store last offset */ + last_offset = offset; + + if ((last_offset < ctx->tx_max) && ((last_offset % + le16_to_cpu(ctx->out_ep->desc.wMaxPacketSize)) == 0)) { + /* force short packet */ + *(((u8 *)skb_out->data) + last_offset) = 0; + last_offset++; + } + + /* zero the rest of the DPEs plus the last NULL entry */ + for (; n <= CDC_NCM_DPT_DATAGRAMS_MAX; n++) { + ctx->tx_ncm.dpe16[n].wDatagramLength = 0; + ctx->tx_ncm.dpe16[n].wDatagramIndex = 0; + } + + /* fill out 16-bit NTB header */ + ctx->tx_ncm.nth16.dwSignature = cpu_to_le32(USB_CDC_NCM_NTH16_SIGN); + ctx->tx_ncm.nth16.wHeaderLength = + cpu_to_le16(sizeof(ctx->tx_ncm.nth16)); + ctx->tx_ncm.nth16.wSequence = cpu_to_le16(ctx->tx_seq); + ctx->tx_ncm.nth16.wBlockLength = cpu_to_le16(last_offset); + ctx->tx_ncm.nth16.wFpIndex = ALIGN(sizeof(struct usb_cdc_ncm_nth16), + ctx->tx_ndp_modulus); + + memcpy(skb_out->data, &(ctx->tx_ncm.nth16), sizeof(ctx->tx_ncm.nth16)); + ctx->tx_seq++; + + /* fill out 16-bit NDP table */ + ctx->tx_ncm.ndp16.dwSignature = + cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN); + rem = sizeof(ctx->tx_ncm.ndp16) + ((ctx->tx_curr_frame_num + 1) * + sizeof(struct usb_cdc_ncm_dpe16)); + ctx->tx_ncm.ndp16.wLength = cpu_to_le16(rem); + ctx->tx_ncm.ndp16.wNextFpIndex = 0; /* reserved */ + + memcpy(((u8 *)skb_out->data) + ctx->tx_ncm.nth16.wFpIndex, + &(ctx->tx_ncm.ndp16), + sizeof(ctx->tx_ncm.ndp16)); + + memcpy(((u8 *)skb_out->data) + ctx->tx_ncm.nth16.wFpIndex + + sizeof(ctx->tx_ncm.ndp16), + &(ctx->tx_ncm.dpe16), + (ctx->tx_curr_frame_num + 1) * + sizeof(struct usb_cdc_ncm_dpe16)); + + /* set frame length */ + skb_put(skb_out, last_offset); + + /* return skb */ + ctx->tx_curr_skb = NULL; + return skb_out; + +exit_no_skb: + return NULL; +} + +static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx) +{ + /* start timer, if not already started */ + if (timer_pending(&ctx->tx_timer) == 0) { + ctx->tx_timer.function = &cdc_ncm_tx_timeout; + ctx->tx_timer.data = (unsigned long)ctx; + ctx->tx_timer.expires = jiffies + ((HZ + 999) / 1000); + add_timer(&ctx->tx_timer); + } +} + +static void cdc_ncm_tx_timeout(unsigned long arg) +{ + struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)arg; + u8 restart; + + spin_lock(&ctx->mtx); + if (ctx->tx_timer_pending != 0) { + ctx->tx_timer_pending--; + restart = 1; + } else + restart = 0; + + spin_unlock(&ctx->mtx); + + if (restart) + cdc_ncm_tx_timeout_start(ctx); + else if (ctx->netdev != NULL) + usbnet_start_xmit(NULL, ctx->netdev); +} + +static 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]; + u8 need_timer = 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(&ctx->mtx); + skb_out = cdc_ncm_fill_tx_frame(ctx, skb); + if (ctx->tx_curr_skb != NULL) + need_timer = 1; + spin_unlock(&ctx->mtx); + + /* Start timer, if there is a remaining skb */ + if (need_timer) + cdc_ncm_tx_timeout_start(ctx); + + if (skb_out) + dev->net->stats.tx_packets += ctx->tx_curr_frame_num; + return skb_out; + +error: + if (skb != NULL) + dev_kfree_skb_any(skb); + + return NULL; +} + +static int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in) +{ + struct sk_buff *skb; + struct cdc_ncm_ctx *ctx; + int sumlen; + int actlen; + int temp; + int nframes; + int x; + int offset; + + ctx = (struct cdc_ncm_ctx *)dev->data[0]; + if (ctx == NULL) + goto error; + + actlen = skb_in->len; + sumlen = CDC_NCM_NTB_MAX_SIZE_RX; + + if (actlen < (sizeof(ctx->rx_ncm.nth16) + sizeof(ctx->rx_ncm.ndp16))) { + pr_debug("frame too short\n"); + goto error; + } + + memcpy(&(ctx->rx_ncm.nth16), ((u8 *)skb_in->data), + sizeof(ctx->rx_ncm.nth16)); + + if (le32_to_cpu(ctx->rx_ncm.nth16.dwSignature) != + USB_CDC_NCM_NTH16_SIGN) { + pr_debug("invalid NTH16 signature <%u>\n", + le32_to_cpu(ctx->rx_ncm.nth16.dwSignature)); + goto error; + } + + temp = le16_to_cpu(ctx->rx_ncm.nth16.wBlockLength); + if (temp > sumlen) { + pr_debug("unsupported NTB block length %u/%u\n", temp, sumlen); + goto error; + } + + temp = le16_to_cpu(ctx->rx_ncm.nth16.wFpIndex); + if ((temp + sizeof(ctx->rx_ncm.ndp16)) > actlen) { + pr_debug("invalid DPT16 index\n"); + goto error; + } + + memcpy(&(ctx->rx_ncm.ndp16), ((u8 *)skb_in->data) + temp, + sizeof(ctx->rx_ncm.ndp16)); + + if (le32_to_cpu(ctx->rx_ncm.ndp16.dwSignature) != + USB_CDC_NCM_NDP16_NOCRC_SIGN) { + pr_debug("invalid DPT16 signature <%u>\n", + le32_to_cpu(ctx->rx_ncm.ndp16.dwSignature)); + goto error; + } + + if (le16_to_cpu(ctx->rx_ncm.ndp16.wLength) < + USB_CDC_NCM_NDP16_LENGTH_MIN) { + pr_debug("invalid DPT16 length <%u>\n", + le32_to_cpu(ctx->rx_ncm.ndp16.dwSignature)); + goto error; + } + + nframes = ((le16_to_cpu(ctx->rx_ncm.ndp16.wLength) - + sizeof(struct usb_cdc_ncm_ndp16)) / + sizeof(struct usb_cdc_ncm_dpe16)); + nframes--; /* we process NDP entries except for the last one */ + + pr_debug("nframes = %u\n", nframes); + + temp += sizeof(ctx->rx_ncm.ndp16); + + if ((temp + nframes * (sizeof(struct usb_cdc_ncm_dpe16))) > actlen) { + pr_debug("Invalid nframes = %d\n", nframes); + goto error; + } + + if (nframes > CDC_NCM_DPT_DATAGRAMS_MAX) { + pr_debug("Truncating number of frames from %u to %u\n", + nframes, CDC_NCM_DPT_DATAGRAMS_MAX); + nframes = CDC_NCM_DPT_DATAGRAMS_MAX; + } + + memcpy(&(ctx->rx_ncm.dpe16), ((u8 *)skb_in->data) + temp, + nframes * (sizeof(struct usb_cdc_ncm_dpe16))); + + for (x = 0; x < nframes; x++) { + offset = le16_to_cpu(ctx->rx_ncm.dpe16[x].wDatagramIndex); + temp = le16_to_cpu(ctx->rx_ncm.dpe16[x].wDatagramLength); + + /* + * CDC NCM ch. 3.7 + * All entries after first NULL entry are to be ignored + */ + if ((offset == 0) || (temp == 0)) { + if (!x) + goto error; /* empty NTB */ + break; + } + + /* sanity checking */ + if (((offset + temp) > actlen) || + (temp > CDC_NCM_MAX_DATAGRAM_SIZE) || (temp < ETH_HLEN)) { + pr_debug("invalid frame detected (ignored)" + "offset[%u]=%u, length=%u, skb=%p\n", + x, offset, temp, skb); + if (!x) + goto error; + break; + + } else { + skb = skb_clone(skb_in, GFP_ATOMIC); + skb->len = temp; + skb->data = ((u8 *)skb_in->data) + offset; + skb_set_tail_pointer(skb, temp); + usbnet_skb_return(dev, skb); + } + } + return 1; +error: + return 0; +} + +static void +cdc_ncm_speed_change(struct cdc_ncm_ctx *ctx, + struct connection_speed_change *data) +{ + uint32_t rx_speed = le32_to_cpu(data->USBitRate); + uint32_t tx_speed = le32_to_cpu(data->DSBitRate); + + /* + * Currently the USB-NET API does not support reporting the actual + * device speed. Do print it instead. + */ + if ((tx_speed != ctx->tx_speed) || (rx_speed != ctx->rx_speed)) { + ctx->tx_speed = tx_speed; + ctx->rx_speed = rx_speed; + + if ((tx_speed > 1000000) && (rx_speed > 1000000)) { + printk(KERN_INFO KBUILD_MODNAME + ": %s: %u mbit/s downlink " + "%u mbit/s uplink\n", + ctx->netdev->name, + (unsigned int)(rx_speed / 1000000U), + (unsigned int)(tx_speed / 1000000U)); + } else { + printk(KERN_INFO KBUILD_MODNAME + ": %s: %u kbit/s downlink " + "%u kbit/s uplink\n", + ctx->netdev->name, + (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(ctx, + (struct connection_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 = event->wValue; + + printk(KERN_INFO KBUILD_MODNAME ": %s: network connection:" + " %sconnected\n", + ctx->netdev->name, ctx->connected ? "" : "dis"); + + if (ctx->connected) + netif_carrier_on(dev->net); + else { + netif_carrier_off(dev->net); + ctx->tx_speed = ctx->rx_speed = 0; + } + break; + + case USB_CDC_NOTIFY_SPEED_CHANGE: + if (urb->actual_length < + (sizeof(*event) + sizeof(struct connection_speed_change))) + set_bit(EVENT_STS_SPLIT, &dev->flags); + else + cdc_ncm_speed_change(ctx, + (struct connection_speed_change *) &event[1]); + break; + + default: + dev_err(&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 int +cdc_ncm_probe(struct usb_interface *udev, const struct usb_device_id *prod) +{ + return usbnet_probe(udev, prod); +} + +static void cdc_ncm_disconnect(struct usb_interface *intf) +{ + struct usbnet *dev = usb_get_intfdata(intf); + + if (dev == NULL) + return; /* already disconnected */ + + usbnet_disconnect(intf); +} + +static int cdc_ncm_manage_power(struct usbnet *dev, int status) +{ + dev->intf->needs_remote_wakeup = status; + return 0; +} + +static const struct driver_info cdc_ncm_info = { + .description = "CDC NCM", + .flags = FLAG_NO_SETINT | FLAG_MULTI_PACKET, + .bind = cdc_ncm_bind, + .unbind = cdc_ncm_unbind, + .check_connect = cdc_ncm_check_connect, + .manage_power = cdc_ncm_manage_power, + .status = cdc_ncm_status, + .rx_fixup = cdc_ncm_rx_fixup, + .tx_fixup = cdc_ncm_tx_fixup, +}; + +static struct usb_driver cdc_ncm_driver = { + .name = "cdc_ncm", + .id_table = cdc_devs, + .probe = cdc_ncm_probe, + .disconnect = cdc_ncm_disconnect, + .suspend = usbnet_suspend, + .resume = usbnet_resume, + .supports_autosuspend = 1, +}; + +static struct ethtool_ops cdc_ncm_ethtool_ops = { + .get_drvinfo = cdc_ncm_get_drvinfo, + .get_link = usbnet_get_link, + .get_msglevel = usbnet_get_msglevel, + .set_msglevel = usbnet_set_msglevel, + .get_settings = usbnet_get_settings, + .set_settings = usbnet_set_settings, + .nway_reset = usbnet_nway_reset, +}; + +static int __init cdc_ncm_init(void) +{ + printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION "\n"); + return usb_register(&cdc_ncm_driver); +} + +module_init(cdc_ncm_init); + +static void __exit cdc_ncm_exit(void) +{ + usb_deregister(&cdc_ncm_driver); +} + +module_exit(cdc_ncm_exit); + +MODULE_AUTHOR("Hans Petter Selasky"); +MODULE_DESCRIPTION("USB CDC NCM host driver"); +MODULE_LICENSE("Dual BSD/GPL"); |