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linux-sg2042/drivers/net/usb/sierra_net.c

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/*
* USB-to-WWAN Driver for Sierra Wireless modems
*
* Copyright (C) 2008, 2009, 2010 Paxton Smith, Matthew Safar, Rory Filer
* <linux@sierrawireless.com>
*
* Portions of this based on the cdc_ether driver by David Brownell (2003-2005)
* and Ole Andre Vadla Ravnas (ActiveSync) (2006).
*
* IMPORTANT DISCLAIMER: This driver is not commercially supported by
* Sierra Wireless. Use at your own risk.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#define DRIVER_VERSION "v.2.0"
#define DRIVER_AUTHOR "Paxton Smith, Matthew Safar, Rory Filer"
#define DRIVER_DESC "USB-to-WWAN Driver for Sierra Wireless modems"
static const char driver_name[] = "sierra_net";
/* if defined debug messages enabled */
/*#define DEBUG*/
#include <linux/module.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/mii.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/usb.h>
#include <linux/usb/cdc.h>
#include <net/ip.h>
#include <net/udp.h>
#include <asm/unaligned.h>
#include <linux/usb/usbnet.h>
#define SWI_USB_REQUEST_GET_FW_ATTR 0x06
#define SWI_GET_FW_ATTR_MASK 0x08
/* atomic counter partially included in MAC address to make sure 2 devices
* do not end up with the same MAC - concept breaks in case of > 255 ifaces
*/
static atomic_t iface_counter = ATOMIC_INIT(0);
/*
* SYNC Timer Delay definition used to set the expiry time
*/
#define SIERRA_NET_SYNCDELAY (2*HZ)
/* Max. MTU supported. The modem buffers are limited to 1500 */
#define SIERRA_NET_MAX_SUPPORTED_MTU 1500
/* The SIERRA_NET_USBCTL_BUF_LEN defines a buffer size allocated for control
* message reception ... and thus the max. received packet.
* (May be the cause for parse_hip returning -EINVAL)
*/
#define SIERRA_NET_USBCTL_BUF_LEN 1024
/* Overriding the default usbnet rx_urb_size */
#define SIERRA_NET_RX_URB_SIZE (8 * 1024)
/* Private data structure */
struct sierra_net_data {
u8 ethr_hdr_tmpl[ETH_HLEN]; /* ethernet header template for rx'd pkts */
u16 link_up; /* air link up or down */
u8 tx_hdr_template[4]; /* part of HIP hdr for tx'd packets */
u8 sync_msg[4]; /* SYNC message */
u8 shdwn_msg[4]; /* Shutdown message */
/* Backpointer to the container */
struct usbnet *usbnet;
u8 ifnum; /* interface number */
/* Bit masks, must be a power of 2 */
#define SIERRA_NET_EVENT_RESP_AVAIL 0x01
#define SIERRA_NET_TIMER_EXPIRY 0x02
unsigned long kevent_flags;
struct work_struct sierra_net_kevent;
struct timer_list sync_timer; /* For retrying SYNC sequence */
};
struct param {
int is_present;
union {
void *ptr;
u32 dword;
u16 word;
u8 byte;
};
};
/* HIP message type */
#define SIERRA_NET_HIP_EXTENDEDID 0x7F
#define SIERRA_NET_HIP_HSYNC_ID 0x60 /* Modem -> host */
#define SIERRA_NET_HIP_RESTART_ID 0x62 /* Modem -> host */
#define SIERRA_NET_HIP_MSYNC_ID 0x20 /* Host -> modem */
#define SIERRA_NET_HIP_SHUTD_ID 0x26 /* Host -> modem */
#define SIERRA_NET_HIP_EXT_IP_IN_ID 0x0202
#define SIERRA_NET_HIP_EXT_IP_OUT_ID 0x0002
/* 3G UMTS Link Sense Indication definitions */
#define SIERRA_NET_HIP_LSI_UMTSID 0x78
/* Reverse Channel Grant Indication HIP message */
#define SIERRA_NET_HIP_RCGI 0x64
/* LSI Protocol types */
#define SIERRA_NET_PROTOCOL_UMTS 0x01
/* LSI Coverage */
#define SIERRA_NET_COVERAGE_NONE 0x00
#define SIERRA_NET_COVERAGE_NOPACKET 0x01
/* LSI Session */
#define SIERRA_NET_SESSION_IDLE 0x00
/* LSI Link types */
#define SIERRA_NET_AS_LINK_TYPE_IPv4 0x00
struct lsi_umts {
u8 protocol;
u8 unused1;
__be16 length;
/* eventually use a union for the rest - assume umts for now */
u8 coverage;
u8 unused2[41];
u8 session_state;
u8 unused3[33];
u8 link_type;
u8 pdp_addr_len; /* NW-supplied PDP address len */
u8 pdp_addr[16]; /* NW-supplied PDP address (bigendian)) */
u8 unused4[23];
u8 dns1_addr_len; /* NW-supplied 1st DNS address len (bigendian) */
u8 dns1_addr[16]; /* NW-supplied 1st DNS address */
u8 dns2_addr_len; /* NW-supplied 2nd DNS address len */
u8 dns2_addr[16]; /* NW-supplied 2nd DNS address (bigendian)*/
u8 wins1_addr_len; /* NW-supplied 1st Wins address len */
u8 wins1_addr[16]; /* NW-supplied 1st Wins address (bigendian)*/
u8 wins2_addr_len; /* NW-supplied 2nd Wins address len */
u8 wins2_addr[16]; /* NW-supplied 2nd Wins address (bigendian) */
u8 unused5[4];
u8 gw_addr_len; /* NW-supplied GW address len */
u8 gw_addr[16]; /* NW-supplied GW address (bigendian) */
u8 reserved[8];
} __packed;
#define SIERRA_NET_LSI_COMMON_LEN 4
#define SIERRA_NET_LSI_UMTS_LEN (sizeof(struct lsi_umts))
#define SIERRA_NET_LSI_UMTS_STATUS_LEN \
(SIERRA_NET_LSI_UMTS_LEN - SIERRA_NET_LSI_COMMON_LEN)
/* Forward definitions */
static void sierra_sync_timer(unsigned long syncdata);
static int sierra_net_change_mtu(struct net_device *net, int new_mtu);
/* Our own net device operations structure */
static const struct net_device_ops sierra_net_device_ops = {
.ndo_open = usbnet_open,
.ndo_stop = usbnet_stop,
.ndo_start_xmit = usbnet_start_xmit,
.ndo_tx_timeout = usbnet_tx_timeout,
.ndo_change_mtu = sierra_net_change_mtu,
.ndo_set_mac_address = eth_mac_addr,
.ndo_validate_addr = eth_validate_addr,
};
/* get private data associated with passed in usbnet device */
static inline struct sierra_net_data *sierra_net_get_private(struct usbnet *dev)
{
return (struct sierra_net_data *)dev->data[0];
}
/* set private data associated with passed in usbnet device */
static inline void sierra_net_set_private(struct usbnet *dev,
struct sierra_net_data *priv)
{
dev->data[0] = (unsigned long)priv;
}
/* is packet IPv4 */
static inline int is_ip(struct sk_buff *skb)
{
return skb->protocol == cpu_to_be16(ETH_P_IP);
}
/*
* check passed in packet and make sure that:
* - it is linear (no scatter/gather)
* - it is ethernet (mac_header properly set)
*/
static int check_ethip_packet(struct sk_buff *skb, struct usbnet *dev)
{
skb_reset_mac_header(skb); /* ethernet header */
if (skb_is_nonlinear(skb)) {
netdev_err(dev->net, "Non linear buffer-dropping\n");
return 0;
}
if (!pskb_may_pull(skb, ETH_HLEN))
return 0;
skb->protocol = eth_hdr(skb)->h_proto;
return 1;
}
static const u8 *save16bit(struct param *p, const u8 *datap)
{
p->is_present = 1;
p->word = get_unaligned_be16(datap);
return datap + sizeof(p->word);
}
static const u8 *save8bit(struct param *p, const u8 *datap)
{
p->is_present = 1;
p->byte = *datap;
return datap + sizeof(p->byte);
}
/*----------------------------------------------------------------------------*
* BEGIN HIP *
*----------------------------------------------------------------------------*/
/* HIP header */
#define SIERRA_NET_HIP_HDR_LEN 4
/* Extended HIP header */
#define SIERRA_NET_HIP_EXT_HDR_LEN 6
struct hip_hdr {
int hdrlen;
struct param payload_len;
struct param msgid;
struct param msgspecific;
struct param extmsgid;
};
static int parse_hip(const u8 *buf, const u32 buflen, struct hip_hdr *hh)
{
const u8 *curp = buf;
int padded;
if (buflen < SIERRA_NET_HIP_HDR_LEN)
return -EPROTO;
curp = save16bit(&hh->payload_len, curp);
curp = save8bit(&hh->msgid, curp);
curp = save8bit(&hh->msgspecific, curp);
padded = hh->msgid.byte & 0x80;
hh->msgid.byte &= 0x7F; /* 7 bits */
hh->extmsgid.is_present = (hh->msgid.byte == SIERRA_NET_HIP_EXTENDEDID);
if (hh->extmsgid.is_present) {
if (buflen < SIERRA_NET_HIP_EXT_HDR_LEN)
return -EPROTO;
hh->payload_len.word &= 0x3FFF; /* 14 bits */
curp = save16bit(&hh->extmsgid, curp);
hh->extmsgid.word &= 0x03FF; /* 10 bits */
hh->hdrlen = SIERRA_NET_HIP_EXT_HDR_LEN;
} else {
hh->payload_len.word &= 0x07FF; /* 11 bits */
hh->hdrlen = SIERRA_NET_HIP_HDR_LEN;
}
if (padded) {
hh->hdrlen++;
hh->payload_len.word--;
}
/* if real packet shorter than the claimed length */
if (buflen < (hh->hdrlen + hh->payload_len.word))
return -EINVAL;
return 0;
}
static void build_hip(u8 *buf, const u16 payloadlen,
struct sierra_net_data *priv)
{
/* the following doesn't have the full functionality. We
* currently build only one kind of header, so it is faster this way
*/
put_unaligned_be16(payloadlen, buf);
memcpy(buf+2, priv->tx_hdr_template, sizeof(priv->tx_hdr_template));
}
/*----------------------------------------------------------------------------*
* END HIP *
*----------------------------------------------------------------------------*/
static int sierra_net_send_cmd(struct usbnet *dev,
u8 *cmd, int cmdlen, const char * cmd_name)
{
struct sierra_net_data *priv = sierra_net_get_private(dev);
int status;
status = usbnet_write_cmd(dev, USB_CDC_SEND_ENCAPSULATED_COMMAND,
USB_DIR_OUT|USB_TYPE_CLASS|USB_RECIP_INTERFACE,
0, priv->ifnum, cmd, cmdlen);
if (status != cmdlen && status != -ENODEV)
netdev_err(dev->net, "Submit %s failed %d\n", cmd_name, status);
return status;
}
static int sierra_net_send_sync(struct usbnet *dev)
{
int status;
struct sierra_net_data *priv = sierra_net_get_private(dev);
dev_dbg(&dev->udev->dev, "%s", __func__);
status = sierra_net_send_cmd(dev, priv->sync_msg,
sizeof(priv->sync_msg), "SYNC");
return status;
}
static void sierra_net_set_ctx_index(struct sierra_net_data *priv, u8 ctx_ix)
{
dev_dbg(&(priv->usbnet->udev->dev), "%s %d", __func__, ctx_ix);
priv->tx_hdr_template[0] = 0x3F;
priv->tx_hdr_template[1] = ctx_ix;
*((__be16 *)&priv->tx_hdr_template[2]) =
cpu_to_be16(SIERRA_NET_HIP_EXT_IP_OUT_ID);
}
static inline int sierra_net_is_valid_addrlen(u8 len)
{
return len == sizeof(struct in_addr);
}
static int sierra_net_parse_lsi(struct usbnet *dev, char *data, int datalen)
{
struct lsi_umts *lsi = (struct lsi_umts *)data;
if (datalen < sizeof(struct lsi_umts)) {
netdev_err(dev->net, "%s: Data length %d, exp %Zu\n",
__func__, datalen,
sizeof(struct lsi_umts));
return -1;
}
if (lsi->length != cpu_to_be16(SIERRA_NET_LSI_UMTS_STATUS_LEN)) {
netdev_err(dev->net, "%s: LSI_UMTS_STATUS_LEN %d, exp %u\n",
__func__, be16_to_cpu(lsi->length),
(u32)SIERRA_NET_LSI_UMTS_STATUS_LEN);
return -1;
}
/* Validate the protocol - only support UMTS for now */
if (lsi->protocol != SIERRA_NET_PROTOCOL_UMTS) {
netdev_err(dev->net, "Protocol unsupported, 0x%02x\n",
lsi->protocol);
return -1;
}
/* Validate the link type */
if (lsi->link_type != SIERRA_NET_AS_LINK_TYPE_IPv4) {
netdev_err(dev->net, "Link type unsupported: 0x%02x\n",
lsi->link_type);
return -1;
}
/* Validate the coverage */
if (lsi->coverage == SIERRA_NET_COVERAGE_NONE
|| lsi->coverage == SIERRA_NET_COVERAGE_NOPACKET) {
netdev_err(dev->net, "No coverage, 0x%02x\n", lsi->coverage);
return 0;
}
/* Validate the session state */
if (lsi->session_state == SIERRA_NET_SESSION_IDLE) {
netdev_err(dev->net, "Session idle, 0x%02x\n",
lsi->session_state);
return 0;
}
/* Set link_sense true */
return 1;
}
static void sierra_net_handle_lsi(struct usbnet *dev, char *data,
struct hip_hdr *hh)
{
struct sierra_net_data *priv = sierra_net_get_private(dev);
int link_up;
link_up = sierra_net_parse_lsi(dev, data + hh->hdrlen,
hh->payload_len.word);
if (link_up < 0) {
netdev_err(dev->net, "Invalid LSI\n");
return;
}
if (link_up) {
sierra_net_set_ctx_index(priv, hh->msgspecific.byte);
priv->link_up = 1;
} else {
priv->link_up = 0;
}
usbnet_link_change(dev, link_up, 0);
}
static void sierra_net_dosync(struct usbnet *dev)
{
int status;
struct sierra_net_data *priv = sierra_net_get_private(dev);
dev_dbg(&dev->udev->dev, "%s", __func__);
/* The SIERRA_NET_HIP_MSYNC_ID command appears to request that the
* firmware restart itself. After restarting, the modem will respond
* with the SIERRA_NET_HIP_RESTART_ID indication. The driver continues
* sending MSYNC commands every few seconds until it receives the
* RESTART event from the firmware
*/
/* tell modem we are ready */
status = sierra_net_send_sync(dev);
if (status < 0)
netdev_err(dev->net,
"Send SYNC failed, status %d\n", status);
status = sierra_net_send_sync(dev);
if (status < 0)
netdev_err(dev->net,
"Send SYNC failed, status %d\n", status);
/* Now, start a timer and make sure we get the Restart Indication */
priv->sync_timer.function = sierra_sync_timer;
priv->sync_timer.data = (unsigned long) dev;
priv->sync_timer.expires = jiffies + SIERRA_NET_SYNCDELAY;
add_timer(&priv->sync_timer);
}
static void sierra_net_kevent(struct work_struct *work)
{
struct sierra_net_data *priv =
container_of(work, struct sierra_net_data, sierra_net_kevent);
struct usbnet *dev = priv->usbnet;
int len;
int err;
u8 *buf;
u8 ifnum;
if (test_bit(SIERRA_NET_EVENT_RESP_AVAIL, &priv->kevent_flags)) {
clear_bit(SIERRA_NET_EVENT_RESP_AVAIL, &priv->kevent_flags);
/* Query the modem for the LSI message */
buf = kzalloc(SIERRA_NET_USBCTL_BUF_LEN, GFP_KERNEL);
if (!buf)
return;
ifnum = priv->ifnum;
len = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
USB_CDC_GET_ENCAPSULATED_RESPONSE,
USB_DIR_IN|USB_TYPE_CLASS|USB_RECIP_INTERFACE,
0, ifnum, buf, SIERRA_NET_USBCTL_BUF_LEN,
USB_CTRL_SET_TIMEOUT);
if (len < 0) {
netdev_err(dev->net,
"usb_control_msg failed, status %d\n", len);
} else {
struct hip_hdr hh;
dev_dbg(&dev->udev->dev, "%s: Received status message,"
" %04x bytes", __func__, len);
err = parse_hip(buf, len, &hh);
if (err) {
netdev_err(dev->net, "%s: Bad packet,"
" parse result %d\n", __func__, err);
kfree(buf);
return;
}
/* Validate packet length */
if (len != hh.hdrlen + hh.payload_len.word) {
netdev_err(dev->net, "%s: Bad packet, received"
" %d, expected %d\n", __func__, len,
hh.hdrlen + hh.payload_len.word);
kfree(buf);
return;
}
/* Switch on received message types */
switch (hh.msgid.byte) {
case SIERRA_NET_HIP_LSI_UMTSID:
dev_dbg(&dev->udev->dev, "LSI for ctx:%d",
hh.msgspecific.byte);
sierra_net_handle_lsi(dev, buf, &hh);
break;
case SIERRA_NET_HIP_RESTART_ID:
dev_dbg(&dev->udev->dev, "Restart reported: %d,"
" stopping sync timer",
hh.msgspecific.byte);
/* Got sync resp - stop timer & clear mask */
del_timer_sync(&priv->sync_timer);
clear_bit(SIERRA_NET_TIMER_EXPIRY,
&priv->kevent_flags);
break;
case SIERRA_NET_HIP_HSYNC_ID:
dev_dbg(&dev->udev->dev, "SYNC received");
err = sierra_net_send_sync(dev);
if (err < 0)
netdev_err(dev->net,
"Send SYNC failed %d\n", err);
break;
case SIERRA_NET_HIP_EXTENDEDID:
netdev_err(dev->net, "Unrecognized HIP msg, "
"extmsgid 0x%04x\n", hh.extmsgid.word);
break;
case SIERRA_NET_HIP_RCGI:
/* Ignored */
break;
default:
netdev_err(dev->net, "Unrecognized HIP msg, "
"msgid 0x%02x\n", hh.msgid.byte);
break;
}
}
kfree(buf);
}
/* The sync timer bit might be set */
if (test_bit(SIERRA_NET_TIMER_EXPIRY, &priv->kevent_flags)) {
clear_bit(SIERRA_NET_TIMER_EXPIRY, &priv->kevent_flags);
dev_dbg(&dev->udev->dev, "Deferred sync timer expiry");
sierra_net_dosync(priv->usbnet);
}
if (priv->kevent_flags)
dev_dbg(&dev->udev->dev, "sierra_net_kevent done, "
"kevent_flags = 0x%lx", priv->kevent_flags);
}
static void sierra_net_defer_kevent(struct usbnet *dev, int work)
{
struct sierra_net_data *priv = sierra_net_get_private(dev);
set_bit(work, &priv->kevent_flags);
schedule_work(&priv->sierra_net_kevent);
}
/*
* Sync Retransmit Timer Handler. On expiry, kick the work queue
*/
static void sierra_sync_timer(unsigned long syncdata)
{
struct usbnet *dev = (struct usbnet *)syncdata;
dev_dbg(&dev->udev->dev, "%s", __func__);
/* Kick the tasklet */
sierra_net_defer_kevent(dev, SIERRA_NET_TIMER_EXPIRY);
}
static void sierra_net_status(struct usbnet *dev, struct urb *urb)
{
struct usb_cdc_notification *event;
dev_dbg(&dev->udev->dev, "%s", __func__);
if (urb->actual_length < sizeof *event)
return;
/* Add cases to handle other standard notifications. */
event = urb->transfer_buffer;
switch (event->bNotificationType) {
case USB_CDC_NOTIFY_NETWORK_CONNECTION:
case USB_CDC_NOTIFY_SPEED_CHANGE:
/* USB 305 sends those */
break;
case USB_CDC_NOTIFY_RESPONSE_AVAILABLE:
sierra_net_defer_kevent(dev, SIERRA_NET_EVENT_RESP_AVAIL);
break;
default:
netdev_err(dev->net, ": unexpected notification %02x!\n",
event->bNotificationType);
break;
}
}
static void sierra_net_get_drvinfo(struct net_device *net,
struct ethtool_drvinfo *info)
{
/* Inherit standard device info */
usbnet_get_drvinfo(net, info);
strlcpy(info->driver, driver_name, sizeof(info->driver));
strlcpy(info->version, DRIVER_VERSION, sizeof(info->version));
}
static u32 sierra_net_get_link(struct net_device *net)
{
struct usbnet *dev = netdev_priv(net);
/* Report link is down whenever the interface is down */
return sierra_net_get_private(dev)->link_up && netif_running(net);
}
static const struct ethtool_ops sierra_net_ethtool_ops = {
.get_drvinfo = sierra_net_get_drvinfo,
.get_link = sierra_net_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,
};
/* MTU can not be more than 1500 bytes, enforce it. */
static int sierra_net_change_mtu(struct net_device *net, int new_mtu)
{
if (new_mtu > SIERRA_NET_MAX_SUPPORTED_MTU)
return -EINVAL;
return usbnet_change_mtu(net, new_mtu);
}
static int sierra_net_get_fw_attr(struct usbnet *dev, u16 *datap)
{
int result = 0;
__le16 attrdata;
result = usbnet_read_cmd(dev,
/* _u8 vendor specific request */
SWI_USB_REQUEST_GET_FW_ATTR,
USB_DIR_IN | USB_TYPE_VENDOR, /* __u8 request type */
0x0000, /* __u16 value not used */
0x0000, /* __u16 index not used */
&attrdata, /* char *data */
sizeof(attrdata) /* __u16 size */
);
if (result < 0)
return -EIO;
*datap = le16_to_cpu(attrdata);
return result;
}
/*
* collects the bulk endpoints, the status endpoint.
*/
static int sierra_net_bind(struct usbnet *dev, struct usb_interface *intf)
{
u8 ifacenum;
u8 numendpoints;
u16 fwattr = 0;
int status;
struct ethhdr *eth;
struct sierra_net_data *priv;
static const u8 sync_tmplate[sizeof(priv->sync_msg)] = {
0x00, 0x00, SIERRA_NET_HIP_MSYNC_ID, 0x00};
static const u8 shdwn_tmplate[sizeof(priv->shdwn_msg)] = {
0x00, 0x00, SIERRA_NET_HIP_SHUTD_ID, 0x00};
dev_dbg(&dev->udev->dev, "%s", __func__);
ifacenum = intf->cur_altsetting->desc.bInterfaceNumber;
numendpoints = intf->cur_altsetting->desc.bNumEndpoints;
/* We have three endpoints, bulk in and out, and a status */
if (numendpoints != 3) {
dev_err(&dev->udev->dev, "Expected 3 endpoints, found: %d",
numendpoints);
return -ENODEV;
}
/* Status endpoint set in usbnet_get_endpoints() */
dev->status = NULL;
status = usbnet_get_endpoints(dev, intf);
if (status < 0) {
dev_err(&dev->udev->dev, "Error in usbnet_get_endpoints (%d)",
status);
return -ENODEV;
}
/* Initialize sierra private data */
priv = kzalloc(sizeof *priv, GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->usbnet = dev;
priv->ifnum = ifacenum;
dev->net->netdev_ops = &sierra_net_device_ops;
/* change MAC addr to include, ifacenum, and to be unique */
dev->net->dev_addr[ETH_ALEN-2] = atomic_inc_return(&iface_counter);
dev->net->dev_addr[ETH_ALEN-1] = ifacenum;
/* we will have to manufacture ethernet headers, prepare template */
eth = (struct ethhdr *)priv->ethr_hdr_tmpl;
memcpy(&eth->h_dest, dev->net->dev_addr, ETH_ALEN);
eth->h_proto = cpu_to_be16(ETH_P_IP);
/* prepare shutdown message template */
memcpy(priv->shdwn_msg, shdwn_tmplate, sizeof(priv->shdwn_msg));
/* set context index initially to 0 - prepares tx hdr template */
sierra_net_set_ctx_index(priv, 0);
/* prepare sync message template */
memcpy(priv->sync_msg, sync_tmplate, sizeof(priv->sync_msg));
/* decrease the rx_urb_size and max_tx_size to 4k on USB 1.1 */
dev->rx_urb_size = SIERRA_NET_RX_URB_SIZE;
if (dev->udev->speed != USB_SPEED_HIGH)
dev->rx_urb_size = min_t(size_t, 4096, SIERRA_NET_RX_URB_SIZE);
dev->net->hard_header_len += SIERRA_NET_HIP_EXT_HDR_LEN;
dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
/* Set up the netdev */
dev->net->flags |= IFF_NOARP;
dev->net->ethtool_ops = &sierra_net_ethtool_ops;
netif_carrier_off(dev->net);
sierra_net_set_private(dev, priv);
priv->kevent_flags = 0;
/* Use the shared workqueue */
INIT_WORK(&priv->sierra_net_kevent, sierra_net_kevent);
/* Only need to do this once */
init_timer(&priv->sync_timer);
/* verify fw attributes */
status = sierra_net_get_fw_attr(dev, &fwattr);
dev_dbg(&dev->udev->dev, "Fw attr: %x\n", fwattr);
/* test whether firmware supports DHCP */
if (!(status == sizeof(fwattr) && (fwattr & SWI_GET_FW_ATTR_MASK))) {
/* found incompatible firmware version */
dev_err(&dev->udev->dev, "Incompatible driver and firmware"
" versions\n");
kfree(priv);
return -ENODEV;
}
return 0;
}
static void sierra_net_unbind(struct usbnet *dev, struct usb_interface *intf)
{
int status;
struct sierra_net_data *priv = sierra_net_get_private(dev);
dev_dbg(&dev->udev->dev, "%s", __func__);
/* kill the timer and work */
del_timer_sync(&priv->sync_timer);
cancel_work_sync(&priv->sierra_net_kevent);
/* tell modem we are going away */
status = sierra_net_send_cmd(dev, priv->shdwn_msg,
sizeof(priv->shdwn_msg), "Shutdown");
if (status < 0)
netdev_err(dev->net,
"usb_control_msg failed, status %d\n", status);
usbnet_status_stop(dev);
sierra_net_set_private(dev, NULL);
kfree(priv);
}
static struct sk_buff *sierra_net_skb_clone(struct usbnet *dev,
struct sk_buff *skb, int len)
{
struct sk_buff *new_skb;
/* clone skb */
new_skb = skb_clone(skb, GFP_ATOMIC);
/* remove len bytes from original */
skb_pull(skb, len);
/* trim next packet to it's length */
if (new_skb) {
skb_trim(new_skb, len);
} else {
if (netif_msg_rx_err(dev))
netdev_err(dev->net, "failed to get skb\n");
dev->net->stats.rx_dropped++;
}
return new_skb;
}
/* ---------------------------- Receive data path ----------------------*/
static int sierra_net_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
{
int err;
struct hip_hdr hh;
struct sk_buff *new_skb;
dev_dbg(&dev->udev->dev, "%s", __func__);
/* could contain multiple packets */
while (likely(skb->len)) {
err = parse_hip(skb->data, skb->len, &hh);
if (err) {
if (netif_msg_rx_err(dev))
netdev_err(dev->net, "Invalid HIP header %d\n",
err);
/* dev->net->stats.rx_errors incremented by caller */
dev->net->stats.rx_length_errors++;
return 0;
}
/* Validate Extended HIP header */
if (!hh.extmsgid.is_present
|| hh.extmsgid.word != SIERRA_NET_HIP_EXT_IP_IN_ID) {
if (netif_msg_rx_err(dev))
netdev_err(dev->net, "HIP/ETH: Invalid pkt\n");
dev->net->stats.rx_frame_errors++;
/* dev->net->stats.rx_errors incremented by caller */
return 0;
}
skb_pull(skb, hh.hdrlen);
/* We are going to accept this packet, prepare it */
memcpy(skb->data, sierra_net_get_private(dev)->ethr_hdr_tmpl,
ETH_HLEN);
/* Last packet in batch handled by usbnet */
if (hh.payload_len.word == skb->len)
return 1;
new_skb = sierra_net_skb_clone(dev, skb, hh.payload_len.word);
if (new_skb)
usbnet_skb_return(dev, new_skb);
} /* while */
return 0;
}
/* ---------------------------- Transmit data path ----------------------*/
static struct sk_buff *sierra_net_tx_fixup(struct usbnet *dev,
struct sk_buff *skb, gfp_t flags)
{
struct sierra_net_data *priv = sierra_net_get_private(dev);
u16 len;
bool need_tail;
BUILD_BUG_ON(FIELD_SIZEOF(struct usbnet, data)
< sizeof(struct cdc_state));
dev_dbg(&dev->udev->dev, "%s", __func__);
if (priv->link_up && check_ethip_packet(skb, dev) && is_ip(skb)) {
/* enough head room as is? */
if (SIERRA_NET_HIP_EXT_HDR_LEN <= skb_headroom(skb)) {
/* Save the Eth/IP length and set up HIP hdr */
len = skb->len;
skb_push(skb, SIERRA_NET_HIP_EXT_HDR_LEN);
/* Handle ZLP issue */
need_tail = ((len + SIERRA_NET_HIP_EXT_HDR_LEN)
% dev->maxpacket == 0);
if (need_tail) {
if (unlikely(skb_tailroom(skb) == 0)) {
netdev_err(dev->net, "tx_fixup:"
"no room for packet\n");
dev_kfree_skb_any(skb);
return NULL;
} else {
skb->data[skb->len] = 0;
__skb_put(skb, 1);
len = len + 1;
}
}
build_hip(skb->data, len, priv);
return skb;
} else {
/*
* compensate in the future if necessary
*/
netdev_err(dev->net, "tx_fixup: no room for HIP\n");
} /* headroom */
}
if (!priv->link_up)
dev->net->stats.tx_carrier_errors++;
/* tx_dropped incremented by usbnet */
/* filter the packet out, release it */
dev_kfree_skb_any(skb);
return NULL;
}
static const struct driver_info sierra_net_info_direct_ip = {
.description = "Sierra Wireless USB-to-WWAN Modem",
.flags = FLAG_WWAN | FLAG_SEND_ZLP,
.bind = sierra_net_bind,
.unbind = sierra_net_unbind,
.status = sierra_net_status,
.rx_fixup = sierra_net_rx_fixup,
.tx_fixup = sierra_net_tx_fixup,
};
static int
sierra_net_probe(struct usb_interface *udev, const struct usb_device_id *prod)
{
int ret;
ret = usbnet_probe(udev, prod);
if (ret == 0) {
struct usbnet *dev = usb_get_intfdata(udev);
ret = usbnet_status_start(dev, GFP_KERNEL);
if (ret == 0) {
/* Interrupt URB now set up; initiate sync sequence */
sierra_net_dosync(dev);
}
}
return ret;
}
#define DIRECT_IP_DEVICE(vend, prod) \
{USB_DEVICE_INTERFACE_NUMBER(vend, prod, 7), \
.driver_info = (unsigned long)&sierra_net_info_direct_ip}, \
{USB_DEVICE_INTERFACE_NUMBER(vend, prod, 10), \
.driver_info = (unsigned long)&sierra_net_info_direct_ip}, \
{USB_DEVICE_INTERFACE_NUMBER(vend, prod, 11), \
.driver_info = (unsigned long)&sierra_net_info_direct_ip}
static const struct usb_device_id products[] = {
DIRECT_IP_DEVICE(0x1199, 0x68A3), /* Sierra Wireless USB-to-WWAN modem */
DIRECT_IP_DEVICE(0x0F3D, 0x68A3), /* AT&T Direct IP modem */
DIRECT_IP_DEVICE(0x1199, 0x68AA), /* Sierra Wireless Direct IP LTE modem */
DIRECT_IP_DEVICE(0x0F3D, 0x68AA), /* AT&T Direct IP LTE modem */
{}, /* last item */
};
MODULE_DEVICE_TABLE(usb, products);
/* We are based on usbnet, so let it handle the USB driver specifics */
static struct usb_driver sierra_net_driver = {
.name = "sierra_net",
.id_table = products,
.probe = sierra_net_probe,
.disconnect = usbnet_disconnect,
.suspend = usbnet_suspend,
.resume = usbnet_resume,
.no_dynamic_id = 1,
.disable_hub_initiated_lpm = 1,
};
module_usb_driver(sierra_net_driver);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_VERSION(DRIVER_VERSION);
MODULE_LICENSE("GPL");
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