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uwb: add the i1480 WLP driver

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Add the driver for the WLP capability of the Intel i1480 device.

Signed-off-by: David Vrabel <david.vrabel@csr.com>
This commit is contained in:
Inaky Perez-Gonzalez 2008-09-17 16:34:21 +01:00 committed by David Vrabel
parent 1ba47da527
commit a21b963aa4
10 changed files with 2818 additions and 0 deletions
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10
drivers/uwb/Kconfig
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@ -76,4 +76,14 @@ config UWB_I1480U
To compile this driver select Y (built in) or M (module). It
is safe to select any even if you do not have the hardware.
config UWB_I1480U_WLP
tristate "Support for Intel Wireless UWB Link 1480 HWA's WLP interface"
depends on UWB_I1480U && UWB_WLP && NET
help
This driver enables WLP support for the i1480 when connected via
USB. WLP is the WiMedia Link Protocol, or IP over UWB.
To compile this driver select Y (built in) or M (module). It
is safe to select any even if you don't have the hardware.
endif # UWB

1
drivers/uwb/i1480/Makefile
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@ -1 +1,2 @@
obj-$(CONFIG_UWB_I1480U) += dfu/ i1480-est.o
obj-$(CONFIG_UWB_I1480U_WLP) += i1480u-wlp/

200
drivers/uwb/i1480/i1480-wlp.h Normal file
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@ -0,0 +1,200 @@
/*
* Intel 1480 Wireless UWB Link
* WLP specific definitions
*
*
* Copyright (C) 2005-2006 Intel Corporation
* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
*
* FIXME: docs
*/
#ifndef __i1480_wlp_h__
#define __i1480_wlp_h__
#include <linux/spinlock.h>
#include <linux/list.h>
#include <linux/uwb.h>
#include <linux/if_ether.h>
#include <asm/byteorder.h>
/* New simplified header format? */
#undef WLP_HDR_FMT_2 /* FIXME: rename */
/**
* Values of the Delivery ID & Type field when PCA or DRP
*
* The Delivery ID & Type field in the WLP TX header indicates whether
* the frame is PCA or DRP. This is done based on the high level bit of
* this field.
* We use this constant to test if the traffic is PCA or DRP as follows:
* if (wlp_tx_hdr_delivery_id_type(wlp_tx_hdr) & WLP_DRP)
* this is DRP traffic
* else
* this is PCA traffic
*/
enum deliver_id_type_bit {
WLP_DRP = 8,
};
/**
* WLP TX header
*
* Indicates UWB/WLP-specific transmission parameters for a network
* packet.
*/
struct wlp_tx_hdr {
/* dword 0 */
struct uwb_dev_addr dstaddr;
u8 key_index;
u8 mac_params;
/* dword 1 */
u8 phy_params;
#ifndef WLP_HDR_FMT_2
u8 reserved;
__le16 oui01; /* FIXME: not so sure if __le16 or u8[2] */
/* dword 2 */
u8 oui2; /* if all LE, it could be merged */
__le16 prid;
#endif
} __attribute__((packed));
static inline int wlp_tx_hdr_delivery_id_type(const struct wlp_tx_hdr *hdr)
{
return hdr->mac_params & 0x0f;
}
static inline int wlp_tx_hdr_ack_policy(const struct wlp_tx_hdr *hdr)
{
return (hdr->mac_params >> 4) & 0x07;
}
static inline int wlp_tx_hdr_rts_cts(const struct wlp_tx_hdr *hdr)
{
return (hdr->mac_params >> 7) & 0x01;
}
static inline void wlp_tx_hdr_set_delivery_id_type(struct wlp_tx_hdr *hdr, int id)
{
hdr->mac_params = (hdr->mac_params & ~0x0f) | id;
}
static inline void wlp_tx_hdr_set_ack_policy(struct wlp_tx_hdr *hdr,
enum uwb_ack_pol policy)
{
hdr->mac_params = (hdr->mac_params & ~0x70) | (policy << 4);
}
static inline void wlp_tx_hdr_set_rts_cts(struct wlp_tx_hdr *hdr, int rts_cts)
{
hdr->mac_params = (hdr->mac_params & ~0x80) | (rts_cts << 7);
}
static inline enum uwb_phy_rate wlp_tx_hdr_phy_rate(const struct wlp_tx_hdr *hdr)
{
return hdr->phy_params & 0x0f;
}
static inline int wlp_tx_hdr_tx_power(const struct wlp_tx_hdr *hdr)
{
return (hdr->phy_params >> 4) & 0x0f;
}
static inline void wlp_tx_hdr_set_phy_rate(struct wlp_tx_hdr *hdr, enum uwb_phy_rate rate)
{
hdr->phy_params = (hdr->phy_params & ~0x0f) | rate;
}
static inline void wlp_tx_hdr_set_tx_power(struct wlp_tx_hdr *hdr, int pwr)
{
hdr->phy_params = (hdr->phy_params & ~0xf0) | (pwr << 4);
}
/**
* WLP RX header
*
* Provides UWB/WLP-specific transmission data for a received
* network packet.
*/
struct wlp_rx_hdr {
/* dword 0 */
struct uwb_dev_addr dstaddr;
struct uwb_dev_addr srcaddr;
/* dword 1 */
u8 LQI;
s8 RSSI;
u8 reserved3;
#ifndef WLP_HDR_FMT_2
u8 oui0;
/* dword 2 */
__le16 oui12;
__le16 prid;
#endif
} __attribute__((packed));
/** User configurable options for WLP */
struct wlp_options {
struct mutex mutex; /* access to user configurable options*/
struct wlp_tx_hdr def_tx_hdr; /* default tx hdr */
u8 pca_base_priority;
u8 bw_alloc; /*index into bw_allocs[] for PCA/DRP reservations*/
};
static inline
void wlp_options_init(struct wlp_options *options)
{
mutex_init(&options->mutex);
wlp_tx_hdr_set_ack_policy(&options->def_tx_hdr, UWB_ACK_INM);
wlp_tx_hdr_set_rts_cts(&options->def_tx_hdr, 1);
/* FIXME: default to phy caps */
wlp_tx_hdr_set_phy_rate(&options->def_tx_hdr, UWB_PHY_RATE_480);
#ifndef WLP_HDR_FMT_2
options->def_tx_hdr.prid = cpu_to_le16(0x0000);
#endif
}
/* sysfs helpers */
extern ssize_t uwb_pca_base_priority_store(struct wlp_options *,
const char *, size_t);
extern ssize_t uwb_pca_base_priority_show(const struct wlp_options *, char *);
extern ssize_t uwb_bw_alloc_store(struct wlp_options *, const char *, size_t);
extern ssize_t uwb_bw_alloc_show(const struct wlp_options *, char *);
extern ssize_t uwb_ack_policy_store(struct wlp_options *,
const char *, size_t);
extern ssize_t uwb_ack_policy_show(const struct wlp_options *, char *);
extern ssize_t uwb_rts_cts_store(struct wlp_options *, const char *, size_t);
extern ssize_t uwb_rts_cts_show(const struct wlp_options *, char *);
extern ssize_t uwb_phy_rate_store(struct wlp_options *, const char *, size_t);
extern ssize_t uwb_phy_rate_show(const struct wlp_options *, char *);
/** Simple bandwidth allocation (temporary and too simple) */
struct wlp_bw_allocs {
const char *name;
struct {
u8 mask, stream;
} tx, rx;
};
#endif /* #ifndef __i1480_wlp_h__ */

8
drivers/uwb/i1480/i1480u-wlp/Makefile Normal file
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@ -0,0 +1,8 @@
obj-$(CONFIG_UWB_I1480U_WLP) += i1480u-wlp.o
i1480u-wlp-objs := \
lc.o \
netdev.o \
rx.o \
sysfs.o \
tx.o

284
drivers/uwb/i1480/i1480u-wlp/i1480u-wlp.h Normal file
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@ -0,0 +1,284 @@
/*
* Intel 1480 Wireless UWB Link USB
* Header formats, constants, general internal interfaces
*
*
* Copyright (C) 2005-2006 Intel Corporation
* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
*
* This is not an standard interface.
*
* FIXME: docs
*
* i1480u-wlp is pretty simple: two endpoints, one for tx, one for
* rx. rx is polled. Network packets (ethernet, whatever) are wrapped
* in i1480 TX or RX headers (for sending over the air), and these
* packets are wrapped in UNTD headers (for sending to the WLP UWB
* controller).
*
* UNTD packets (UNTD hdr + i1480 hdr + network packet) packets
* cannot be bigger than i1480u_MAX_FRG_SIZE. When this happens, the
* i1480 packet is broken in chunks/packets:
*
* UNTD-1st.hdr + i1480.hdr + payload
* UNTD-next.hdr + payload
* ...
* UNTD-last.hdr + payload
*
* so that each packet is smaller or equal than i1480u_MAX_FRG_SIZE.
*
* All HW structures and bitmaps are little endian, so we need to play
* ugly tricks when defining bitfields. Hoping for the day GCC
* implements __attribute__((endian(1234))).
*
* FIXME: ROADMAP to the whole implementation
*/
#ifndef __i1480u_wlp_h__
#define __i1480u_wlp_h__
#include <linux/usb.h>
#include <linux/netdevice.h>
#include <linux/uwb.h> /* struct uwb_rc, struct uwb_notifs_handler */
#include <linux/wlp.h>
#include "../i1480-wlp.h"
#undef i1480u_FLOW_CONTROL /* Enable flow control code */
/**
* Basic flow control
*/
enum {
i1480u_TX_INFLIGHT_MAX = 1000,
i1480u_TX_INFLIGHT_THRESHOLD = 100,
};
/** Maximum size of a transaction that we can tx/rx */
enum {
/* Maximum packet size computed as follows: max UNTD header (8) +
* i1480 RX header (8) + max Ethernet header and payload (4096) +
* Padding added by skb_reserve (2) to make post Ethernet payload
* start on 16 byte boundary*/
i1480u_MAX_RX_PKT_SIZE = 4114,
i1480u_MAX_FRG_SIZE = 512,
i1480u_RX_BUFS = 9,
};
/**
* UNTD packet type
*
* We need to fragment any payload whose UNTD packet is going to be
* bigger than i1480u_MAX_FRG_SIZE.
*/
enum i1480u_pkt_type {
i1480u_PKT_FRAG_1ST = 0x1,
i1480u_PKT_FRAG_NXT = 0x0,
i1480u_PKT_FRAG_LST = 0x2,
i1480u_PKT_FRAG_CMP = 0x3
};
enum {
i1480u_PKT_NONE = 0x4,
};
/** USB Network Transfer Descriptor - common */
struct untd_hdr {
u8 type;
__le16 len;
} __attribute__((packed));
static inline enum i1480u_pkt_type untd_hdr_type(const struct untd_hdr *hdr)
{
return hdr->type & 0x03;
}
static inline int untd_hdr_rx_tx(const struct untd_hdr *hdr)
{
return (hdr->type >> 2) & 0x01;
}
static inline void untd_hdr_set_type(struct untd_hdr *hdr, enum i1480u_pkt_type type)
{
hdr->type = (hdr->type & ~0x03) | type;
}
static inline void untd_hdr_set_rx_tx(struct untd_hdr *hdr, int rx_tx)
{
hdr->type = (hdr->type & ~0x04) | (rx_tx << 2);
}
/**
* USB Network Transfer Descriptor - Complete Packet
*
* This is for a packet that is smaller (header + payload) than
* i1480u_MAX_FRG_SIZE.
*
* @hdr.total_len is the size of the payload; the payload doesn't
* count this header nor the padding, but includes the size of i1480
* header.
*/
struct untd_hdr_cmp {
struct untd_hdr hdr;
u8 padding;
} __attribute__((packed));
/**
* USB Network Transfer Descriptor - First fragment
*
* @hdr.len is the size of the *whole packet* (excluding UNTD
* headers); @fragment_len is the size of the payload (excluding UNTD
* headers, but including i1480 headers).
*/
struct untd_hdr_1st {
struct untd_hdr hdr;
__le16 fragment_len;
u8 padding[3];
} __attribute__((packed));
/**
* USB Network Transfer Descriptor - Next / Last [Rest]
*
* @hdr.len is the size of the payload, not including headrs.
*/
struct untd_hdr_rst {
struct untd_hdr hdr;
u8 padding;
} __attribute__((packed));
/**
* Transmission context
*
* Wraps all the stuff needed to track a pending/active tx
* operation.
*/
struct i1480u_tx {
struct list_head list_node;
struct i1480u *i1480u;
struct urb *urb;
struct sk_buff *skb;
struct wlp_tx_hdr *wlp_tx_hdr;
void *buf; /* if NULL, no new buf was used */
size_t buf_size;
};
/**
* Basic flow control
*
* We maintain a basic flow control counter. "count" how many TX URBs are
* outstanding. Only allow "max"
* TX URBs to be outstanding. If this value is reached the queue will be
* stopped. The queue will be restarted when there are
* "threshold" URBs outstanding.
* Maintain a counter of how many time the TX queue needed to be restarted
* due to the "max" being exceeded and the "threshold" reached again. The
* timestamp "restart_ts" is to keep track from when the counter was last
* queried (see sysfs handling of file wlp_tx_inflight).
*/
struct i1480u_tx_inflight {
atomic_t count;
unsigned long max;
unsigned long threshold;
unsigned long restart_ts;
atomic_t restart_count;
};
/**
* Instance of a i1480u WLP interface
*
* Keeps references to the USB device that wraps it, as well as it's
* interface and associated UWB host controller. As well, it also
* keeps a link to the netdevice for integration into the networking
* stack.
* We maintian separate error history for the tx and rx endpoints because
* the implementation does not rely on locking - having one shared
* structure between endpoints may cause problems. Adding locking to the
* implementation will have higher cost than adding a separate structure.
*/
struct i1480u {
struct usb_device *usb_dev;
struct usb_interface *usb_iface;
struct net_device *net_dev;
spinlock_t lock;
struct net_device_stats stats;
/* RX context handling */
struct sk_buff *rx_skb;
struct uwb_dev_addr rx_srcaddr;
size_t rx_untd_pkt_size;
struct i1480u_rx_buf {
struct i1480u *i1480u; /* back pointer */
struct urb *urb;
struct sk_buff *data; /* i1480u_MAX_RX_PKT_SIZE each */
} rx_buf[i1480u_RX_BUFS]; /* N bufs */
spinlock_t tx_list_lock; /* TX context */
struct list_head tx_list;
u8 tx_stream;
struct stats lqe_stats, rssi_stats; /* radio statistics */
/* Options we can set from sysfs */
struct wlp_options options;
struct uwb_notifs_handler uwb_notifs_handler;
struct edc tx_errors;
struct edc rx_errors;
struct wlp wlp;
#ifdef i1480u_FLOW_CONTROL
struct urb *notif_urb;
struct edc notif_edc; /* error density counter */
u8 notif_buffer[1];
#endif
struct i1480u_tx_inflight tx_inflight;
};
/* Internal interfaces */
extern void i1480u_rx_cb(struct urb *urb);
extern int i1480u_rx_setup(struct i1480u *);
extern void i1480u_rx_release(struct i1480u *);
extern void i1480u_tx_release(struct i1480u *);
extern int i1480u_xmit_frame(struct wlp *, struct sk_buff *,
struct uwb_dev_addr *);
extern void i1480u_stop_queue(struct wlp *);
extern void i1480u_start_queue(struct wlp *);
extern int i1480u_sysfs_setup(struct i1480u *);
extern void i1480u_sysfs_release(struct i1480u *);
/* netdev interface */
extern int i1480u_open(struct net_device *);
extern int i1480u_stop(struct net_device *);
extern int i1480u_hard_start_xmit(struct sk_buff *, struct net_device *);
extern void i1480u_tx_timeout(struct net_device *);
extern int i1480u_set_config(struct net_device *, struct ifmap *);
extern struct net_device_stats *i1480u_get_stats(struct net_device *);
extern int i1480u_change_mtu(struct net_device *, int);
extern void i1480u_uwb_notifs_cb(void *, struct uwb_dev *, enum uwb_notifs);
/* bandwidth allocation callback */
extern void i1480u_bw_alloc_cb(struct uwb_rsv *);
/* Sys FS */
extern struct attribute_group i1480u_wlp_attr_group;
#endif /* #ifndef __i1480u_wlp_h__ */

421
drivers/uwb/i1480/i1480u-wlp/lc.c Normal file
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@ -0,0 +1,421 @@
/*
* WUSB Wire Adapter: WLP interface
* Driver for the Linux Network stack.
*
* Copyright (C) 2005-2006 Intel Corporation
* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
*
* FIXME: docs
*
* This implements a very simple network driver for the WLP USB
* device that is associated to a UWB (Ultra Wide Band) host.
*
* This is seen as an interface of a composite device. Once the UWB
* host has an association to another WLP capable device, the
* networking interface (aka WLP) can start to send packets back and
* forth.
*
* Limitations:
*
* - Hand cranked; can't ifup the interface until there is an association
*
* - BW allocation very simplistic [see i1480u_mas_set() and callees].
*
*
* ROADMAP:
*
* ENTRY POINTS (driver model):
*
* i1480u_driver_{exit,init}(): initialization of the driver.
*
* i1480u_probe(): called by the driver code when a device
* matching 'i1480u_id_table' is connected.
*
* This allocs a netdev instance, inits with
* i1480u_add(), then registers_netdev().
* i1480u_init()
* i1480u_add()
*
* i1480u_disconnect(): device has been disconnected/module
* is being removed.
* i1480u_rm()
*/
#include <linux/version.h>
#include <linux/if_arp.h>
#include <linux/etherdevice.h>
#include <linux/uwb/debug.h>
#include "i1480u-wlp.h"
static inline
void i1480u_init(struct i1480u *i1480u)
{
/* nothing so far... doesn't it suck? */
spin_lock_init(&i1480u->lock);
INIT_LIST_HEAD(&i1480u->tx_list);
spin_lock_init(&i1480u->tx_list_lock);
wlp_options_init(&i1480u->options);
edc_init(&i1480u->tx_errors);
edc_init(&i1480u->rx_errors);
#ifdef i1480u_FLOW_CONTROL
edc_init(&i1480u->notif_edc);
#endif
stats_init(&i1480u->lqe_stats);
stats_init(&i1480u->rssi_stats);
wlp_init(&i1480u->wlp);
}
/**
* Fill WLP device information structure
*
* The structure will contain a few character arrays, each ending with a
* null terminated string. Each string has to fit (excluding terminating
* character) into a specified range obtained from the WLP substack.
*
* It is still not clear exactly how this device information should be
* obtained. Until we find out we use the USB device descriptor as backup, some
* information elements have intuitive mappings, other not.
*/
static
void i1480u_fill_device_info(struct wlp *wlp, struct wlp_device_info *dev_info)
{
struct i1480u *i1480u = container_of(wlp, struct i1480u, wlp);
struct usb_device *usb_dev = i1480u->usb_dev;
/* Treat device name and model name the same */
if (usb_dev->descriptor.iProduct) {
usb_string(usb_dev, usb_dev->descriptor.iProduct,
dev_info->name, sizeof(dev_info->name));
usb_string(usb_dev, usb_dev->descriptor.iProduct,
dev_info->model_name, sizeof(dev_info->model_name));
}
if (usb_dev->descriptor.iManufacturer)
usb_string(usb_dev, usb_dev->descriptor.iManufacturer,
dev_info->manufacturer,
sizeof(dev_info->manufacturer));
scnprintf(dev_info->model_nr, sizeof(dev_info->model_nr), "%04x",
__le16_to_cpu(usb_dev->descriptor.bcdDevice));
if (usb_dev->descriptor.iSerialNumber)
usb_string(usb_dev, usb_dev->descriptor.iSerialNumber,
dev_info->serial, sizeof(dev_info->serial));
/* FIXME: where should we obtain category? */
dev_info->prim_dev_type.category = cpu_to_le16(WLP_DEV_CAT_OTHER);
/* FIXME: Complete OUI and OUIsubdiv attributes */
}
#ifdef i1480u_FLOW_CONTROL
/**
* Callback for the notification endpoint
*
* This mostly controls the xon/xoff protocol. In case of hard error,
* we stop the queue. If not, we always retry.
*/
static
void i1480u_notif_cb(struct urb *urb, struct pt_regs *regs)
{
struct i1480u *i1480u = urb->context;
struct usb_interface *usb_iface = i1480u->usb_iface;
struct device *dev = &usb_iface->dev;
int result;
switch (urb->status) {
case 0: /* Got valid data, do xon/xoff */
switch (i1480u->notif_buffer[0]) {
case 'N':
dev_err(dev, "XOFF STOPPING queue at %lu\n", jiffies);
netif_stop_queue(i1480u->net_dev);
break;
case 'A':
dev_err(dev, "XON STARTING queue at %lu\n", jiffies);
netif_start_queue(i1480u->net_dev);
break;
default:
dev_err(dev, "NEP: unknown data 0x%02hhx\n",
i1480u->notif_buffer[0]);
}
break;
case -ECONNRESET: /* Controlled situation ... */
case -ENOENT: /* we killed the URB... */
dev_err(dev, "NEP: URB reset/noent %d\n", urb->status);
goto error;
case -ESHUTDOWN: /* going away! */
dev_err(dev, "NEP: URB down %d\n", urb->status);
goto error;
default: /* Retry unless it gets ugly */
if (edc_inc(&i1480u->notif_edc, EDC_MAX_ERRORS,
EDC_ERROR_TIMEFRAME)) {
dev_err(dev, "NEP: URB max acceptable errors "
"exceeded; resetting device\n");
goto error_reset;
}
dev_err(dev, "NEP: URB error %d\n", urb->status);
break;
}
result = usb_submit_urb(urb, GFP_ATOMIC);
if (result < 0) {
dev_err(dev, "NEP: Can't resubmit URB: %d; resetting device\n",
result);
goto error_reset;
}
return;
error_reset:
wlp_reset_all(&i1480-wlp);
error:
netif_stop_queue(i1480u->net_dev);
return;
}
#endif
static
int i1480u_add(struct i1480u *i1480u, struct usb_interface *iface)
{
int result = -ENODEV;
struct wlp *wlp = &i1480u->wlp;
struct usb_device *usb_dev = interface_to_usbdev(iface);
struct net_device *net_dev = i1480u->net_dev;
struct uwb_rc *rc;
struct uwb_dev *uwb_dev;
#ifdef i1480u_FLOW_CONTROL
struct usb_endpoint_descriptor *epd;
#endif
i1480u->usb_dev = usb_get_dev(usb_dev);
i1480u->usb_iface = iface;
rc = uwb_rc_get_by_grandpa(&i1480u->usb_dev->dev);
if (rc == NULL) {
dev_err(&iface->dev, "Cannot get associated UWB Radio "
"Controller\n");
goto out;
}
wlp->xmit_frame = i1480u_xmit_frame;
wlp->fill_device_info = i1480u_fill_device_info;
wlp->stop_queue = i1480u_stop_queue;
wlp->start_queue = i1480u_start_queue;
result = wlp_setup(wlp, rc);
if (result < 0) {
dev_err(&iface->dev, "Cannot setup WLP\n");
goto error_wlp_setup;
}
result = 0;
ether_setup(net_dev); /* make it an etherdevice */
uwb_dev = &rc->uwb_dev;
/* FIXME: hookup address change notifications? */
memcpy(net_dev->dev_addr, uwb_dev->mac_addr.data,
sizeof(net_dev->dev_addr));
net_dev->hard_header_len = sizeof(struct untd_hdr_cmp)
+ sizeof(struct wlp_tx_hdr)
+ WLP_DATA_HLEN
+ ETH_HLEN;
net_dev->mtu = 3500;
net_dev->tx_queue_len = 20; /* FIXME: maybe use 1000? */
/* net_dev->flags &= ~IFF_BROADCAST; FIXME: BUG in firmware */
/* FIXME: multicast disabled */
net_dev->flags &= ~IFF_MULTICAST;
net_dev->features &= ~NETIF_F_SG;
net_dev->features &= ~NETIF_F_FRAGLIST;
/* All NETIF_F_*_CSUM disabled */
net_dev->features |= NETIF_F_HIGHDMA;
net_dev->watchdog_timeo = 5*HZ; /* FIXME: a better default? */
net_dev->open = i1480u_open;
net_dev->stop = i1480u_stop;
net_dev->hard_start_xmit = i1480u_hard_start_xmit;
net_dev->tx_timeout = i1480u_tx_timeout;
net_dev->get_stats = i1480u_get_stats;
net_dev->set_config = i1480u_set_config;
net_dev->change_mtu = i1480u_change_mtu;
#ifdef i1480u_FLOW_CONTROL
/* Notification endpoint setup (submitted when we open the device) */
i1480u->notif_urb = usb_alloc_urb(0, GFP_KERNEL);
if (i1480u->notif_urb == NULL) {
dev_err(&iface->dev, "Unable to allocate notification URB\n");
result = -ENOMEM;
goto error_urb_alloc;
}
epd = &iface->cur_altsetting->endpoint[0].desc;
usb_fill_int_urb(i1480u->notif_urb, usb_dev,
usb_rcvintpipe(usb_dev, epd->bEndpointAddress),
i1480u->notif_buffer, sizeof(i1480u->notif_buffer),
i1480u_notif_cb, i1480u, epd->bInterval);
#endif
i1480u->tx_inflight.max = i1480u_TX_INFLIGHT_MAX;
i1480u->tx_inflight.threshold = i1480u_TX_INFLIGHT_THRESHOLD;
i1480u->tx_inflight.restart_ts = jiffies;
usb_set_intfdata(iface, i1480u);
return result;
#ifdef i1480u_FLOW_CONTROL
error_urb_alloc:
#endif
wlp_remove(wlp);
error_wlp_setup:
uwb_rc_put(rc);
out:
usb_put_dev(i1480u->usb_dev);
return result;
}
static void i1480u_rm(struct i1480u *i1480u)
{
struct uwb_rc *rc = i1480u->wlp.rc;
usb_set_intfdata(i1480u->usb_iface, NULL);
#ifdef i1480u_FLOW_CONTROL
usb_kill_urb(i1480u->notif_urb);
usb_free_urb(i1480u->notif_urb);
#endif
wlp_remove(&i1480u->wlp);
uwb_rc_put(rc);
usb_put_dev(i1480u->usb_dev);
}
/** Just setup @net_dev's i1480u private data */
static void i1480u_netdev_setup(struct net_device *net_dev)
{
struct i1480u *i1480u = netdev_priv(net_dev);
/* Initialize @i1480u */
memset(i1480u, 0, sizeof(*i1480u));
i1480u_init(i1480u);
}
/**
* Probe a i1480u interface and register it
*
* @iface: USB interface to link to
* @id: USB class/subclass/protocol id
* @returns: 0 if ok, < 0 errno code on error.
*
* Does basic housekeeping stuff and then allocs a netdev with space
* for the i1480u data. Initializes, registers in i1480u, registers in
* netdev, ready to go.
*/
static int i1480u_probe(struct usb_interface *iface,
const struct usb_device_id *id)
{
int result;
struct net_device *net_dev;
struct device *dev = &iface->dev;
struct i1480u *i1480u;
/* Allocate instance [calls i1480u_netdev_setup() on it] */
result = -ENOMEM;
net_dev = alloc_netdev(sizeof(*i1480u), "wlp%d", i1480u_netdev_setup);
if (net_dev == NULL) {
dev_err(dev, "no memory for network device instance\n");
goto error_alloc_netdev;
}
SET_NETDEV_DEV(net_dev, dev);
i1480u = netdev_priv(net_dev);
i1480u->net_dev = net_dev;
result = i1480u_add(i1480u, iface); /* Now setup all the wlp stuff */
if (result < 0) {
dev_err(dev, "cannot add i1480u device: %d\n", result);
goto error_i1480u_add;
}
result = register_netdev(net_dev); /* Okey dokey, bring it up */
if (result < 0) {
dev_err(dev, "cannot register network device: %d\n", result);
goto error_register_netdev;
}
i1480u_sysfs_setup(i1480u);
if (result < 0)
goto error_sysfs_init;
return 0;
error_sysfs_init:
unregister_netdev(net_dev);
error_register_netdev:
i1480u_rm(i1480u);
error_i1480u_add:
free_netdev(net_dev);
error_alloc_netdev:
return result;
}
/**
* Disconect a i1480u from the system.
*
* i1480u_stop() has been called before, so al the rx and tx contexts
* have been taken down already. Make sure the queue is stopped,
* unregister netdev and i1480u, free and kill.
*/
static void i1480u_disconnect(struct usb_interface *iface)
{
struct i1480u *i1480u;
struct net_device *net_dev;
i1480u = usb_get_intfdata(iface);
net_dev = i1480u->net_dev;
netif_stop_queue(net_dev);
#ifdef i1480u_FLOW_CONTROL
usb_kill_urb(i1480u->notif_urb);
#endif
i1480u_sysfs_release(i1480u);
unregister_netdev(net_dev);
i1480u_rm(i1480u);
free_netdev(net_dev);
}
static struct usb_device_id i1480u_id_table[] = {
{
.match_flags = USB_DEVICE_ID_MATCH_DEVICE \
| USB_DEVICE_ID_MATCH_DEV_INFO \
| USB_DEVICE_ID_MATCH_INT_INFO,
.idVendor = 0x8086,
.idProduct = 0x0c3b,
.bDeviceClass = 0xef,
.bDeviceSubClass = 0x02,
.bDeviceProtocol = 0x02,
.bInterfaceClass = 0xff,
.bInterfaceSubClass = 0xff,
.bInterfaceProtocol = 0xff,
},
{},
};
MODULE_DEVICE_TABLE(usb, i1480u_id_table);
static struct usb_driver i1480u_driver = {
.name = KBUILD_MODNAME,
.probe = i1480u_probe,
.disconnect = i1480u_disconnect,
.id_table = i1480u_id_table,
};
static int __init i1480u_driver_init(void)
{
return usb_register(&i1480u_driver);
}
module_init(i1480u_driver_init);
static void __exit i1480u_driver_exit(void)
{
usb_deregister(&i1480u_driver);
}
module_exit(i1480u_driver_exit);
MODULE_AUTHOR("Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>");
MODULE_DESCRIPTION("i1480 Wireless UWB Link WLP networking for USB");
MODULE_LICENSE("GPL");

368
drivers/uwb/i1480/i1480u-wlp/netdev.c Normal file
View File

@ -0,0 +1,368 @@
/*
* WUSB Wire Adapter: WLP interface
* Driver for the Linux Network stack.
*
* Copyright (C) 2005-2006 Intel Corporation
* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
*
* FIXME: docs
*
* Implementation of the netdevice linkage (except tx and rx related stuff).
*
* ROADMAP:
*
* ENTRY POINTS (Net device):
*
* i1480u_open(): Called when we ifconfig up the interface;
* associates to a UWB host controller, reserves
* bandwidth (MAS), sets up RX USB URB and starts
* the queue.
*
* i1480u_stop(): Called when we ifconfig down a interface;
* reverses _open().
*
* i1480u_set_config():
*/
#include <linux/if_arp.h>
#include <linux/etherdevice.h>
#include <linux/uwb/debug.h>
#include "i1480u-wlp.h"
struct i1480u_cmd_set_ip_mas {
struct uwb_rccb rccb;
struct uwb_dev_addr addr;
u8 stream;
u8 owner;
u8 type; /* enum uwb_drp_type */
u8 baMAS[32];
} __attribute__((packed));
static
int i1480u_set_ip_mas(
struct uwb_rc *rc,
const struct uwb_dev_addr *dstaddr,
u8 stream, u8 owner, u8 type, unsigned long *mas)
{
int result;
struct i1480u_cmd_set_ip_mas *cmd;
struct uwb_rc_evt_confirm reply;
result = -ENOMEM;
cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
if (cmd == NULL)
goto error_kzalloc;
cmd->rccb.bCommandType = 0xfd;
cmd->rccb.wCommand = cpu_to_le16(0x000e);
cmd->addr = *dstaddr;
cmd->stream = stream;
cmd->owner = owner;
cmd->type = type;
if (mas == NULL)
memset(cmd->baMAS, 0x00, sizeof(cmd->baMAS));
else
memcpy(cmd->baMAS, mas, sizeof(cmd->baMAS));
reply.rceb.bEventType = 0xfd;
reply.rceb.wEvent = cpu_to_le16(0x000e);
result = uwb_rc_cmd(rc, "SET-IP-MAS", &cmd->rccb, sizeof(*cmd),
&reply.rceb, sizeof(reply));
if (result < 0)
goto error_cmd;
if (reply.bResultCode != UWB_RC_RES_FAIL) {
dev_err(&rc->uwb_dev.dev,
"SET-IP-MAS: command execution failed: %d\n",
reply.bResultCode);
result = -EIO;
}
error_cmd:
kfree(cmd);
error_kzalloc:
return result;
}
/*
* Inform a WLP interface of a MAS reservation
*
* @rc is assumed refcnted.
*/
/* FIXME: detect if remote device is WLP capable? */
static int i1480u_mas_set_dev(struct uwb_dev *uwb_dev, struct uwb_rc *rc,
u8 stream, u8 owner, u8 type, unsigned long *mas)
{
int result = 0;
struct device *dev = &rc->uwb_dev.dev;
result = i1480u_set_ip_mas(rc, &uwb_dev->dev_addr, stream, owner,
type, mas);
if (result < 0) {
char rcaddrbuf[UWB_ADDR_STRSIZE], devaddrbuf[UWB_ADDR_STRSIZE];
uwb_dev_addr_print(rcaddrbuf, sizeof(rcaddrbuf),
&rc->uwb_dev.dev_addr);
uwb_dev_addr_print(devaddrbuf, sizeof(devaddrbuf),
&uwb_dev->dev_addr);
dev_err(dev, "Set IP MAS (%s to %s) failed: %d\n",
rcaddrbuf, devaddrbuf, result);
}
return result;
}
/**
* Called by bandwidth allocator when change occurs in reservation.
*
* @rsv: The reservation that is being established, modified, or
* terminated.
*
* When a reservation is established, modified, or terminated the upper layer
* (WLP here) needs set/update the currently available Media Access Slots
* that can be use for IP traffic.
*
* Our action taken during failure depends on how the reservation is being
* changed:
* - if reservation is being established we do nothing if we cannot set the
* new MAS to be used
* - if reservation is being terminated we revert back to PCA whether the
* SET IP MAS command succeeds or not.
*/
void i1480u_bw_alloc_cb(struct uwb_rsv *rsv)
{
int result = 0;
struct i1480u *i1480u = rsv->pal_priv;
struct device *dev = &i1480u->usb_iface->dev;
struct uwb_dev *target_dev = rsv->target.dev;
struct uwb_rc *rc = i1480u->wlp.rc;
u8 stream = rsv->stream;
int type = rsv->type;
int is_owner = rsv->owner == &rc->uwb_dev;
unsigned long *bmp = rsv->mas.bm;
dev_err(dev, "WLP callback called - sending set ip mas\n");
/*user cannot change options while setting configuration*/
mutex_lock(&i1480u->options.mutex);
switch (rsv->state) {
case UWB_RSV_STATE_T_ACCEPTED:
case UWB_RSV_STATE_O_ESTABLISHED:
result = i1480u_mas_set_dev(target_dev, rc, stream, is_owner,
type, bmp);
if (result < 0) {
dev_err(dev, "MAS reservation failed: %d\n", result);
goto out;
}
if (is_owner) {
wlp_tx_hdr_set_delivery_id_type(&i1480u->options.def_tx_hdr,
WLP_DRP | stream);
wlp_tx_hdr_set_rts_cts(&i1480u->options.def_tx_hdr, 0);
}
break;
case UWB_RSV_STATE_NONE:
/* revert back to PCA */
result = i1480u_mas_set_dev(target_dev, rc, stream, is_owner,
type, bmp);
if (result < 0)
dev_err(dev, "MAS reservation failed: %d\n", result);
/* Revert to PCA even though SET IP MAS failed. */
wlp_tx_hdr_set_delivery_id_type(&i1480u->options.def_tx_hdr,
i1480u->options.pca_base_priority);
wlp_tx_hdr_set_rts_cts(&i1480u->options.def_tx_hdr, 1);
break;
default:
dev_err(dev, "unexpected WLP reservation state: %s (%d).\n",
uwb_rsv_state_str(rsv->state), rsv->state);
break;
}
out:
mutex_unlock(&i1480u->options.mutex);
return;
}
/**
*
* Called on 'ifconfig up'
*/
int i1480u_open(struct net_device *net_dev)
{
int result;
struct i1480u *i1480u = netdev_priv(net_dev);
struct wlp *wlp = &i1480u->wlp;
struct uwb_rc *rc;
struct device *dev = &i1480u->usb_iface->dev;
rc = wlp->rc;
result = i1480u_rx_setup(i1480u); /* Alloc RX stuff */
if (result < 0)
goto error_rx_setup;
netif_wake_queue(net_dev);
#ifdef i1480u_FLOW_CONTROL
result = usb_submit_urb(i1480u->notif_urb, GFP_KERNEL);;
if (result < 0) {
dev_err(dev, "Can't submit notification URB: %d\n", result);
goto error_notif_urb_submit;
}
#endif
i1480u->uwb_notifs_handler.cb = i1480u_uwb_notifs_cb;
i1480u->uwb_notifs_handler.data = i1480u;
if (uwb_bg_joined(rc))
netif_carrier_on(net_dev);
else
netif_carrier_off(net_dev);
uwb_notifs_register(rc, &i1480u->uwb_notifs_handler);
/* Interface is up with an address, now we can create WSS */
result = wlp_wss_setup(net_dev, &wlp->wss);
if (result < 0) {
dev_err(dev, "Can't create WSS: %d. \n", result);
goto error_notif_deregister;
}
return 0;
error_notif_deregister:
uwb_notifs_deregister(rc, &i1480u->uwb_notifs_handler);
#ifdef i1480u_FLOW_CONTROL
error_notif_urb_submit:
#endif
netif_stop_queue(net_dev);
i1480u_rx_release(i1480u);
error_rx_setup:
return result;
}
/**
* Called on 'ifconfig down'
*/
int i1480u_stop(struct net_device *net_dev)
{
struct i1480u *i1480u = netdev_priv(net_dev);
struct wlp *wlp = &i1480u->wlp;
struct uwb_rc *rc = wlp->rc;
BUG_ON(wlp->rc == NULL);
wlp_wss_remove(&wlp->wss);
uwb_notifs_deregister(rc, &i1480u->uwb_notifs_handler);
netif_carrier_off(net_dev);
#ifdef i1480u_FLOW_CONTROL
usb_kill_urb(i1480u->notif_urb);
#endif
netif_stop_queue(net_dev);
i1480u_rx_release(i1480u);
i1480u_tx_release(i1480u);
return 0;
}
/** Report statistics */
struct net_device_stats *i1480u_get_stats(struct net_device *net_dev)
{
struct i1480u *i1480u = netdev_priv(net_dev);
return &i1480u->stats;
}
/**
*
* Change the interface config--we probably don't have to do anything.
*/
int i1480u_set_config(struct net_device *net_dev, struct ifmap *map)
{
int result;
struct i1480u *i1480u = netdev_priv(net_dev);
BUG_ON(i1480u->wlp.rc == NULL);
result = 0;
return result;
}
/**
* Change the MTU of the interface
*/
int i1480u_change_mtu(struct net_device *net_dev, int mtu)
{
static union {
struct wlp_tx_hdr tx;
struct wlp_rx_hdr rx;
} i1480u_all_hdrs;
if (mtu < ETH_HLEN) /* We encap eth frames */
return -ERANGE;
if (mtu > 4000 - sizeof(i1480u_all_hdrs))
return -ERANGE;
net_dev->mtu = mtu;
return 0;
}
/**
* Callback function to handle events from UWB
* When we see other devices we know the carrier is ok,
* if we are the only device in the beacon group we set the carrier
* state to off.
* */
void i1480u_uwb_notifs_cb(void *data, struct uwb_dev *uwb_dev,
enum uwb_notifs event)
{
struct i1480u *i1480u = data;
struct net_device *net_dev = i1480u->net_dev;
struct device *dev = &i1480u->usb_iface->dev;
switch (event) {
case UWB_NOTIF_BG_JOIN:
netif_carrier_on(net_dev);
dev_info(dev, "Link is up\n");
break;
case UWB_NOTIF_BG_LEAVE:
netif_carrier_off(net_dev);
dev_info(dev, "Link is down\n");
break;
default:
dev_err(dev, "don't know how to handle event %d from uwb\n",
event);
}
}
/**
* Stop the network queue
*
* Enable WLP substack to stop network queue. We also set the flow control
* threshold at this time to prevent the flow control from restarting the
* queue.
*
* we are loosing the current threshold value here ... FIXME?
*/
void i1480u_stop_queue(struct wlp *wlp)
{
struct i1480u *i1480u = container_of(wlp, struct i1480u, wlp);
struct net_device *net_dev = i1480u->net_dev;
i1480u->tx_inflight.threshold = 0;
netif_stop_queue(net_dev);
}
/**
* Start the network queue
*
* Enable WLP substack to start network queue. Also re-enable the flow
* control to manage the queue again.
*
* We re-enable the flow control by storing the default threshold in the
* flow control threshold. This means that if the user modified the
* threshold before the queue was stopped and restarted that information
* will be lost. FIXME?
*/
void i1480u_start_queue(struct wlp *wlp)
{
struct i1480u *i1480u = container_of(wlp, struct i1480u, wlp);
struct net_device *net_dev = i1480u->net_dev;
i1480u->tx_inflight.threshold = i1480u_TX_INFLIGHT_THRESHOLD;
netif_start_queue(net_dev);
}

486
drivers/uwb/i1480/i1480u-wlp/rx.c Normal file
View File

@ -0,0 +1,486 @@
/*
* WUSB Wire Adapter: WLP interface
* Driver for the Linux Network stack.
*
* Copyright (C) 2005-2006 Intel Corporation
* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
*
* i1480u's RX handling is simple. i1480u will send the received
* network packets broken up in fragments; 1 to N fragments make a
* packet, we assemble them together and deliver the packet with netif_rx().
*
* Beacuse each USB transfer is a *single* fragment (except when the
* transfer contains a first fragment), each URB called thus
* back contains one or two fragments. So we queue N URBs, each with its own
* fragment buffer. When a URB is done, we process it (adding to the
* current skb from the fragment buffer until complete). Once
* processed, we requeue the URB. There is always a bunch of URBs
* ready to take data, so the intergap should be minimal.
*
* An URB's transfer buffer is the data field of a socket buffer. This
* reduces copying as data can be passed directly to network layer. If a
* complete packet or 1st fragment is received the URB's transfer buffer is
* taken away from it and used to send data to the network layer. In this
* case a new transfer buffer is allocated to the URB before being requeued.
* If a "NEXT" or "LAST" fragment is received, the fragment contents is
* appended to the RX packet under construction and the transfer buffer
* is reused. To be able to use this buffer to assemble complete packets
* we set each buffer's size to that of the MAX ethernet packet that can
* be received. There is thus room for improvement in memory usage.
*
* When the max tx fragment size increases, we should be able to read
* data into the skbs directly with very simple code.
*
* ROADMAP:
*
* ENTRY POINTS:
*
* i1480u_rx_setup(): setup RX context [from i1480u_open()]
*
* i1480u_rx_release(): release RX context [from i1480u_stop()]
*
* i1480u_rx_cb(): called when the RX USB URB receives a
* packet. It removes the header and pushes it up
* the Linux netdev stack with netif_rx().
*
* i1480u_rx_buffer()
* i1480u_drop() and i1480u_fix()
* i1480u_skb_deliver
*
*/
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include "i1480u-wlp.h"
#define D_LOCAL 0
#include <linux/uwb/debug.h>
/**
* Setup the RX context
*
* Each URB is provided with a transfer_buffer that is the data field
* of a new socket buffer.
*/
int i1480u_rx_setup(struct i1480u *i1480u)
{
int result, cnt;
struct device *dev = &i1480u->usb_iface->dev;
struct net_device *net_dev = i1480u->net_dev;
struct usb_endpoint_descriptor *epd;
struct sk_buff *skb;
/* Alloc RX stuff */
i1480u->rx_skb = NULL; /* not in process of receiving packet */
result = -ENOMEM;
epd = &i1480u->usb_iface->cur_altsetting->endpoint[1].desc;
for (cnt = 0; cnt < i1480u_RX_BUFS; cnt++) {
struct i1480u_rx_buf *rx_buf = &i1480u->rx_buf[cnt];
rx_buf->i1480u = i1480u;
skb = dev_alloc_skb(i1480u_MAX_RX_PKT_SIZE);
if (!skb) {
dev_err(dev,
"RX: cannot allocate RX buffer %d\n", cnt);
result = -ENOMEM;
goto error;
}
skb->dev = net_dev;
skb->ip_summed = CHECKSUM_NONE;
skb_reserve(skb, 2);
rx_buf->data = skb;
rx_buf->urb = usb_alloc_urb(0, GFP_KERNEL);
if (unlikely(rx_buf->urb == NULL)) {
dev_err(dev, "RX: cannot allocate URB %d\n", cnt);
result = -ENOMEM;
goto error;
}
usb_fill_bulk_urb(rx_buf->urb, i1480u->usb_dev,
usb_rcvbulkpipe(i1480u->usb_dev, epd->bEndpointAddress),
rx_buf->data->data, i1480u_MAX_RX_PKT_SIZE - 2,
i1480u_rx_cb, rx_buf);
result = usb_submit_urb(rx_buf->urb, GFP_NOIO);
if (unlikely(result < 0)) {
dev_err(dev, "RX: cannot submit URB %d: %d\n",
cnt, result);
goto error;
}
}
return 0;
error:
i1480u_rx_release(i1480u);
return result;
}
/** Release resources associated to the rx context */
void i1480u_rx_release(struct i1480u *i1480u)
{
int cnt;
for (cnt = 0; cnt < i1480u_RX_BUFS; cnt++) {
if (i1480u->rx_buf[cnt].data)
dev_kfree_skb(i1480u->rx_buf[cnt].data);
if (i1480u->rx_buf[cnt].urb) {
usb_kill_urb(i1480u->rx_buf[cnt].urb);
usb_free_urb(i1480u->rx_buf[cnt].urb);
}
}
if (i1480u->rx_skb != NULL)
dev_kfree_skb(i1480u->rx_skb);
}
static
void i1480u_rx_unlink_urbs(struct i1480u *i1480u)
{
int cnt;
for (cnt = 0; cnt < i1480u_RX_BUFS; cnt++) {
if (i1480u->rx_buf[cnt].urb)
usb_unlink_urb(i1480u->rx_buf[cnt].urb);
}
}
/** Fix an out-of-sequence packet */
#define i1480u_fix(i1480u, msg...) \
do { \
if (printk_ratelimit()) \
dev_err(&i1480u->usb_iface->dev, msg); \
dev_kfree_skb_irq(i1480u->rx_skb); \
i1480u->rx_skb = NULL; \
i1480u->rx_untd_pkt_size = 0; \
} while (0)
/** Drop an out-of-sequence packet */
#define i1480u_drop(i1480u, msg...) \
do { \
if (printk_ratelimit()) \
dev_err(&i1480u->usb_iface->dev, msg); \
i1480u->stats.rx_dropped++; \
} while (0)
/** Finalizes setting up the SKB and delivers it
*
* We first pass the incoming frame to WLP substack for verification. It
* may also be a WLP association frame in which case WLP will take over the
* processing. If WLP does not take it over it will still verify it, if the
* frame is invalid the skb will be freed by WLP and we will not continue
* parsing.
* */
static
void i1480u_skb_deliver(struct i1480u *i1480u)
{
int should_parse;
struct net_device *net_dev = i1480u->net_dev;
struct device *dev = &i1480u->usb_iface->dev;
d_printf(6, dev, "RX delivered pre skb(%p), %u bytes\n",
i1480u->rx_skb, i1480u->rx_skb->len);
d_dump(7, dev, i1480u->rx_skb->data, i1480u->rx_skb->len);
should_parse = wlp_receive_frame(dev, &i1480u->wlp, i1480u->rx_skb,
&i1480u->rx_srcaddr);
if (!should_parse)
goto out;
i1480u->rx_skb->protocol = eth_type_trans(i1480u->rx_skb, net_dev);
d_printf(5, dev, "RX delivered skb(%p), %u bytes\n",
i1480u->rx_skb, i1480u->rx_skb->len);
d_dump(7, dev, i1480u->rx_skb->data,
i1480u->rx_skb->len > 72 ? 72 : i1480u->rx_skb->len);
i1480u->stats.rx_packets++;
i1480u->stats.rx_bytes += i1480u->rx_untd_pkt_size;
net_dev->last_rx = jiffies;
/* FIXME: flow control: check netif_rx() retval */
netif_rx(i1480u->rx_skb); /* deliver */
out:
i1480u->rx_skb = NULL;
i1480u->rx_untd_pkt_size = 0;
}
/**
* Process a buffer of data received from the USB RX endpoint
*
* First fragment arrives with next or last fragment. All other fragments
* arrive alone.
*
* /me hates long functions.
*/
static
void i1480u_rx_buffer(struct i1480u_rx_buf *rx_buf)
{
unsigned pkt_completed = 0; /* !0 when we got all pkt fragments */
size_t untd_hdr_size, untd_frg_size;
size_t i1480u_hdr_size;
struct wlp_rx_hdr *i1480u_hdr = NULL;
struct i1480u *i1480u = rx_buf->i1480u;
struct sk_buff *skb = rx_buf->data;
int size_left = rx_buf->urb->actual_length;
void *ptr = rx_buf->urb->transfer_buffer; /* also rx_buf->data->data */
struct untd_hdr *untd_hdr;
struct net_device *net_dev = i1480u->net_dev;
struct device *dev = &i1480u->usb_iface->dev;
struct sk_buff *new_skb;
#if 0
dev_fnstart(dev,
"(i1480u %p ptr %p size_left %zu)\n", i1480u, ptr, size_left);
dev_err(dev, "RX packet, %zu bytes\n", size_left);
dump_bytes(dev, ptr, size_left);
#endif
i1480u_hdr_size = sizeof(struct wlp_rx_hdr);
while (size_left > 0) {
if (pkt_completed) {
i1480u_drop(i1480u, "RX: fragment follows completed"
"packet in same buffer. Dropping\n");
break;
}
untd_hdr = ptr;
if (size_left < sizeof(*untd_hdr)) { /* Check the UNTD header */
i1480u_drop(i1480u, "RX: short UNTD header! Dropping\n");
goto out;
}
if (unlikely(untd_hdr_rx_tx(untd_hdr) == 0)) { /* Paranoia: TX set? */
i1480u_drop(i1480u, "RX: TX bit set! Dropping\n");
goto out;
}
switch (untd_hdr_type(untd_hdr)) { /* Check the UNTD header type */
case i1480u_PKT_FRAG_1ST: {
struct untd_hdr_1st *untd_hdr_1st = (void *) untd_hdr;
dev_dbg(dev, "1st fragment\n");
untd_hdr_size = sizeof(struct untd_hdr_1st);
if (i1480u->rx_skb != NULL)
i1480u_fix(i1480u, "RX: 1st fragment out of "
"sequence! Fixing\n");
if (size_left < untd_hdr_size + i1480u_hdr_size) {
i1480u_drop(i1480u, "RX: short 1st fragment! "
"Dropping\n");
goto out;
}
i1480u->rx_untd_pkt_size = le16_to_cpu(untd_hdr->len)
- i1480u_hdr_size;
untd_frg_size = le16_to_cpu(untd_hdr_1st->fragment_len);
if (size_left < untd_hdr_size + untd_frg_size) {
i1480u_drop(i1480u,
"RX: short payload! Dropping\n");
goto out;
}
i1480u->rx_skb = skb;
i1480u_hdr = (void *) untd_hdr_1st + untd_hdr_size;
i1480u->rx_srcaddr = i1480u_hdr->srcaddr;
skb_put(i1480u->rx_skb, untd_hdr_size + untd_frg_size);
skb_pull(i1480u->rx_skb, untd_hdr_size + i1480u_hdr_size);
stats_add_sample(&i1480u->lqe_stats, (s8) i1480u_hdr->LQI - 7);
stats_add_sample(&i1480u->rssi_stats, i1480u_hdr->RSSI + 18);
rx_buf->data = NULL; /* need to create new buffer */
break;
}
case i1480u_PKT_FRAG_NXT: {
dev_dbg(dev, "nxt fragment\n");
untd_hdr_size = sizeof(struct untd_hdr_rst);
if (i1480u->rx_skb == NULL) {
i1480u_drop(i1480u, "RX: next fragment out of "
"sequence! Dropping\n");
goto out;
}
if (size_left < untd_hdr_size) {
i1480u_drop(i1480u, "RX: short NXT fragment! "
"Dropping\n");
goto out;
}
untd_frg_size = le16_to_cpu(untd_hdr->len);
if (size_left < untd_hdr_size + untd_frg_size) {
i1480u_drop(i1480u,
"RX: short payload! Dropping\n");
goto out;
}
memmove(skb_put(i1480u->rx_skb, untd_frg_size),
ptr + untd_hdr_size, untd_frg_size);
break;
}
case i1480u_PKT_FRAG_LST: {
dev_dbg(dev, "Lst fragment\n");
untd_hdr_size = sizeof(struct untd_hdr_rst);
if (i1480u->rx_skb == NULL) {
i1480u_drop(i1480u, "RX: last fragment out of "
"sequence! Dropping\n");
goto out;
}
if (size_left < untd_hdr_size) {
i1480u_drop(i1480u, "RX: short LST fragment! "
"Dropping\n");
goto out;
}
untd_frg_size = le16_to_cpu(untd_hdr->len);
if (size_left < untd_frg_size + untd_hdr_size) {
i1480u_drop(i1480u,
"RX: short payload! Dropping\n");
goto out;
}
memmove(skb_put(i1480u->rx_skb, untd_frg_size),
ptr + untd_hdr_size, untd_frg_size);
pkt_completed = 1;
break;
}
case i1480u_PKT_FRAG_CMP: {
dev_dbg(dev, "cmp fragment\n");
untd_hdr_size = sizeof(struct untd_hdr_cmp);
if (i1480u->rx_skb != NULL)
i1480u_fix(i1480u, "RX: fix out-of-sequence CMP"
" fragment!\n");
if (size_left < untd_hdr_size + i1480u_hdr_size) {
i1480u_drop(i1480u, "RX: short CMP fragment! "
"Dropping\n");
goto out;
}
i1480u->rx_untd_pkt_size = le16_to_cpu(untd_hdr->len);
untd_frg_size = i1480u->rx_untd_pkt_size;
if (size_left < i1480u->rx_untd_pkt_size + untd_hdr_size) {
i1480u_drop(i1480u,
"RX: short payload! Dropping\n");
goto out;
}
i1480u->rx_skb = skb;
i1480u_hdr = (void *) untd_hdr + untd_hdr_size;
i1480u->rx_srcaddr = i1480u_hdr->srcaddr;
stats_add_sample(&i1480u->lqe_stats, (s8) i1480u_hdr->LQI - 7);
stats_add_sample(&i1480u->rssi_stats, i1480u_hdr->RSSI + 18);
skb_put(i1480u->rx_skb, untd_hdr_size + i1480u->rx_untd_pkt_size);
skb_pull(i1480u->rx_skb, untd_hdr_size + i1480u_hdr_size);
rx_buf->data = NULL; /* for hand off skb to network stack */
pkt_completed = 1;
i1480u->rx_untd_pkt_size -= i1480u_hdr_size; /* accurate stat */
break;
}
default:
i1480u_drop(i1480u, "RX: unknown packet type %u! "
"Dropping\n", untd_hdr_type(untd_hdr));
goto out;
}
size_left -= untd_hdr_size + untd_frg_size;
if (size_left > 0)
ptr += untd_hdr_size + untd_frg_size;
}
if (pkt_completed)
i1480u_skb_deliver(i1480u);
out:
/* recreate needed RX buffers*/
if (rx_buf->data == NULL) {
/* buffer is being used to receive packet, create new */
new_skb = dev_alloc_skb(i1480u_MAX_RX_PKT_SIZE);
if (!new_skb) {
if (printk_ratelimit())
dev_err(dev,
"RX: cannot allocate RX buffer\n");
} else {
new_skb->dev = net_dev;
new_skb->ip_summed = CHECKSUM_NONE;
skb_reserve(new_skb, 2);
rx_buf->data = new_skb;
}
}
return;
}
/**
* Called when an RX URB has finished receiving or has found some kind
* of error condition.
*
* LIMITATIONS:
*
* - We read USB-transfers, each transfer contains a SINGLE fragment
* (can contain a complete packet, or a 1st, next, or last fragment
* of a packet).
* Looks like a transfer can contain more than one fragment (07/18/06)
*
* - Each transfer buffer is the size of the maximum packet size (minus
* headroom), i1480u_MAX_PKT_SIZE - 2
*
* - We always read the full USB-transfer, no partials.
*
* - Each transfer is read directly into a skb. This skb will be used to
* send data to the upper layers if it is the first fragment or a complete
* packet. In the other cases the data will be copied from the skb to
* another skb that is being prepared for the upper layers from a prev
* first fragment.
*
* It is simply too much of a pain. Gosh, there should be a unified
* SG infrastructure for *everything* [so that I could declare a SG
* buffer, pass it to USB for receiving, append some space to it if
* I wish, receive more until I have the whole chunk, adapt
* pointers on each fragment to remove hardware headers and then
* attach that to an skbuff and netif_rx()].
*/
void i1480u_rx_cb(struct urb *urb)
{
int result;
int do_parse_buffer = 1;
struct i1480u_rx_buf *rx_buf = urb->context;
struct i1480u *i1480u = rx_buf->i1480u;
struct device *dev = &i1480u->usb_iface->dev;
unsigned long flags;
u8 rx_buf_idx = rx_buf - i1480u->rx_buf;
switch (urb->status) {
case 0:
break;
case -ECONNRESET: /* Not an error, but a controlled situation; */
case -ENOENT: /* (we killed the URB)...so, no broadcast */
case -ESHUTDOWN: /* going away! */
dev_err(dev, "RX URB[%u]: goind down %d\n",
rx_buf_idx, urb->status);
goto error;
default:
dev_err(dev, "RX URB[%u]: unknown status %d\n",
rx_buf_idx, urb->status);
if (edc_inc(&i1480u->rx_errors, EDC_MAX_ERRORS,
EDC_ERROR_TIMEFRAME)) {
dev_err(dev, "RX: max acceptable errors exceeded,"
" resetting device.\n");
i1480u_rx_unlink_urbs(i1480u);
wlp_reset_all(&i1480u->wlp);
goto error;
}
do_parse_buffer = 0;
break;
}
spin_lock_irqsave(&i1480u->lock, flags);
/* chew the data fragments, extract network packets */
if (do_parse_buffer) {
i1480u_rx_buffer(rx_buf);
if (rx_buf->data) {
rx_buf->urb->transfer_buffer = rx_buf->data->data;
result = usb_submit_urb(rx_buf->urb, GFP_ATOMIC);
if (result < 0) {
dev_err(dev, "RX URB[%u]: cannot submit %d\n",
rx_buf_idx, result);
}
}
}
spin_unlock_irqrestore(&i1480u->lock, flags);
error:
return;
}

408
drivers/uwb/i1480/i1480u-wlp/sysfs.c Normal file
View File

@ -0,0 +1,408 @@
/*
* WUSB Wire Adapter: WLP interface
* Sysfs interfaces
*
* Copyright (C) 2005-2006 Intel Corporation
* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
*
* FIXME: docs
*/
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/uwb/debug.h>
#include <linux/device.h>
#include "i1480u-wlp.h"
/**
*
* @dev: Class device from the net_device; assumed refcnted.
*
* Yes, I don't lock--we assume it is refcounted and I am getting a
* single byte value that is kind of atomic to read.
*/
ssize_t uwb_phy_rate_show(const struct wlp_options *options, char *buf)
{
return sprintf(buf, "%u\n",
wlp_tx_hdr_phy_rate(&options->def_tx_hdr));
}
EXPORT_SYMBOL_GPL(uwb_phy_rate_show);
ssize_t uwb_phy_rate_store(struct wlp_options *options,
const char *buf, size_t size)
{
ssize_t result;
unsigned rate;
result = sscanf(buf, "%u\n", &rate);
if (result != 1) {
result = -EINVAL;
goto out;
}
result = -EINVAL;
if (rate >= UWB_PHY_RATE_INVALID)
goto out;
wlp_tx_hdr_set_phy_rate(&options->def_tx_hdr, rate);
result = 0;
out:
return result < 0 ? result : size;
}
EXPORT_SYMBOL_GPL(uwb_phy_rate_store);
ssize_t uwb_rts_cts_show(const struct wlp_options *options, char *buf)
{
return sprintf(buf, "%u\n",
wlp_tx_hdr_rts_cts(&options->def_tx_hdr));
}
EXPORT_SYMBOL_GPL(uwb_rts_cts_show);
ssize_t uwb_rts_cts_store(struct wlp_options *options,
const char *buf, size_t size)
{
ssize_t result;
unsigned value;
result = sscanf(buf, "%u\n", &value);
if (result != 1) {
result = -EINVAL;
goto out;
}
result = -EINVAL;
wlp_tx_hdr_set_rts_cts(&options->def_tx_hdr, !!value);
result = 0;
out:
return result < 0 ? result : size;
}
EXPORT_SYMBOL_GPL(uwb_rts_cts_store);
ssize_t uwb_ack_policy_show(const struct wlp_options *options, char *buf)
{
return sprintf(buf, "%u\n",
wlp_tx_hdr_ack_policy(&options->def_tx_hdr));
}
EXPORT_SYMBOL_GPL(uwb_ack_policy_show);
ssize_t uwb_ack_policy_store(struct wlp_options *options,
const char *buf, size_t size)
{
ssize_t result;
unsigned value;
result = sscanf(buf, "%u\n", &value);
if (result != 1 || value > UWB_ACK_B_REQ) {
result = -EINVAL;
goto out;
}
wlp_tx_hdr_set_ack_policy(&options->def_tx_hdr, value);
result = 0;
out:
return result < 0 ? result : size;
}
EXPORT_SYMBOL_GPL(uwb_ack_policy_store);
/**
* Show the PCA base priority.
*
* We can access without locking, as the value is (for now) orthogonal
* to other values.
*/
ssize_t uwb_pca_base_priority_show(const struct wlp_options *options,
char *buf)
{
return sprintf(buf, "%u\n",
options->pca_base_priority);
}
EXPORT_SYMBOL_GPL(uwb_pca_base_priority_show);
/**
* Set the PCA base priority.
*
* We can access without locking, as the value is (for now) orthogonal
* to other values.
*/
ssize_t uwb_pca_base_priority_store(struct wlp_options *options,
const char *buf, size_t size)
{
ssize_t result = -EINVAL;
u8 pca_base_priority;
result = sscanf(buf, "%hhu\n", &pca_base_priority);
if (result != 1) {
result = -EINVAL;
goto out;
}
result = -EINVAL;
if (pca_base_priority >= 8)
goto out;
options->pca_base_priority = pca_base_priority;
/* Update TX header if we are currently using PCA. */
if (result >= 0 && (wlp_tx_hdr_delivery_id_type(&options->def_tx_hdr) & WLP_DRP) == 0)
wlp_tx_hdr_set_delivery_id_type(&options->def_tx_hdr, options->pca_base_priority);
result = 0;
out:
return result < 0 ? result : size;
}
EXPORT_SYMBOL_GPL(uwb_pca_base_priority_store);
/**
* Show current inflight values
*
* Will print the current MAX and THRESHOLD values for the basic flow
* control. In addition it will report how many times the TX queue needed
* to be restarted since the last time this query was made.
*/
static ssize_t wlp_tx_inflight_show(struct i1480u_tx_inflight *inflight,
char *buf)
{
ssize_t result;
unsigned long sec_elapsed = (jiffies - inflight->restart_ts)/HZ;
unsigned long restart_count = atomic_read(&inflight->restart_count);
result = scnprintf(buf, PAGE_SIZE, "%lu %lu %d %lu %lu %lu\n"
"#read: threshold max inflight_count restarts "
"seconds restarts/sec\n"
"#write: threshold max\n",
inflight->threshold, inflight->max,
atomic_read(&inflight->count),
restart_count, sec_elapsed,
sec_elapsed == 0 ? 0 : restart_count/sec_elapsed);
inflight->restart_ts = jiffies;
atomic_set(&inflight->restart_count, 0);
return result;
}
static
ssize_t wlp_tx_inflight_store(struct i1480u_tx_inflight *inflight,
const char *buf, size_t size)
{
unsigned long in_threshold, in_max;
ssize_t result;
result = sscanf(buf, "%lu %lu", &in_threshold, &in_max);
if (result != 2)
return -EINVAL;
if (in_max <= in_threshold)
return -EINVAL;
inflight->max = in_max;
inflight->threshold = in_threshold;
return size;
}
/*
* Glue (or function adaptors) for accesing info on sysfs
*
* [we need this indirection because the PCI driver does almost the
* same]
*
* Linux 2.6.21 changed how 'struct netdevice' does attributes (from
* having a 'struct class_dev' to having a 'struct device'). That is
* quite of a pain.
*
* So we try to abstract that here. i1480u_SHOW() and i1480u_STORE()
* create adaptors for extracting the 'struct i1480u' from a 'struct
* dev' and calling a function for doing a sysfs operation (as we have
* them factorized already). i1480u_ATTR creates the attribute file
* (CLASS_DEVICE_ATTR or DEVICE_ATTR) and i1480u_ATTR_NAME produces a
* class_device_attr_NAME or device_attr_NAME (for group registration).
*/
#include <linux/version.h>
#define i1480u_SHOW(name, fn, param) \
static ssize_t i1480u_show_##name(struct device *dev, \
struct device_attribute *attr,\
char *buf) \
{ \
struct i1480u *i1480u = netdev_priv(to_net_dev(dev)); \
return fn(&i1480u->param, buf); \
}
#define i1480u_STORE(name, fn, param) \
static ssize_t i1480u_store_##name(struct device *dev, \
struct device_attribute *attr,\
const char *buf, size_t size)\
{ \
struct i1480u *i1480u = netdev_priv(to_net_dev(dev)); \
return fn(&i1480u->param, buf, size); \
}
#define i1480u_ATTR(name, perm) static DEVICE_ATTR(name, perm, \
i1480u_show_##name,\
i1480u_store_##name)
#define i1480u_ATTR_SHOW(name) static DEVICE_ATTR(name, \
S_IRUGO, \
i1480u_show_##name, NULL)
#define i1480u_ATTR_NAME(a) (dev_attr_##a)
/*
* Sysfs adaptors
*/
i1480u_SHOW(uwb_phy_rate, uwb_phy_rate_show, options);
i1480u_STORE(uwb_phy_rate, uwb_phy_rate_store, options);
i1480u_ATTR(uwb_phy_rate, S_IRUGO | S_IWUSR);
i1480u_SHOW(uwb_rts_cts, uwb_rts_cts_show, options);
i1480u_STORE(uwb_rts_cts, uwb_rts_cts_store, options);
i1480u_ATTR(uwb_rts_cts, S_IRUGO | S_IWUSR);
i1480u_SHOW(uwb_ack_policy, uwb_ack_policy_show, options);
i1480u_STORE(uwb_ack_policy, uwb_ack_policy_store, options);
i1480u_ATTR(uwb_ack_policy, S_IRUGO | S_IWUSR);
i1480u_SHOW(uwb_pca_base_priority, uwb_pca_base_priority_show, options);
i1480u_STORE(uwb_pca_base_priority, uwb_pca_base_priority_store, options);
i1480u_ATTR(uwb_pca_base_priority, S_IRUGO | S_IWUSR);
i1480u_SHOW(wlp_eda, wlp_eda_show, wlp);
i1480u_STORE(wlp_eda, wlp_eda_store, wlp);
i1480u_ATTR(wlp_eda, S_IRUGO | S_IWUSR);
i1480u_SHOW(wlp_uuid, wlp_uuid_show, wlp);
i1480u_STORE(wlp_uuid, wlp_uuid_store, wlp);
i1480u_ATTR(wlp_uuid, S_IRUGO | S_IWUSR);
i1480u_SHOW(wlp_dev_name, wlp_dev_name_show, wlp);
i1480u_STORE(wlp_dev_name, wlp_dev_name_store, wlp);
i1480u_ATTR(wlp_dev_name, S_IRUGO | S_IWUSR);
i1480u_SHOW(wlp_dev_manufacturer, wlp_dev_manufacturer_show, wlp);
i1480u_STORE(wlp_dev_manufacturer, wlp_dev_manufacturer_store, wlp);
i1480u_ATTR(wlp_dev_manufacturer, S_IRUGO | S_IWUSR);
i1480u_SHOW(wlp_dev_model_name, wlp_dev_model_name_show, wlp);
i1480u_STORE(wlp_dev_model_name, wlp_dev_model_name_store, wlp);
i1480u_ATTR(wlp_dev_model_name, S_IRUGO | S_IWUSR);
i1480u_SHOW(wlp_dev_model_nr, wlp_dev_model_nr_show, wlp);
i1480u_STORE(wlp_dev_model_nr, wlp_dev_model_nr_store, wlp);
i1480u_ATTR(wlp_dev_model_nr, S_IRUGO | S_IWUSR);
i1480u_SHOW(wlp_dev_serial, wlp_dev_serial_show, wlp);
i1480u_STORE(wlp_dev_serial, wlp_dev_serial_store, wlp);
i1480u_ATTR(wlp_dev_serial, S_IRUGO | S_IWUSR);
i1480u_SHOW(wlp_dev_prim_category, wlp_dev_prim_category_show, wlp);
i1480u_STORE(wlp_dev_prim_category, wlp_dev_prim_category_store, wlp);
i1480u_ATTR(wlp_dev_prim_category, S_IRUGO | S_IWUSR);
i1480u_SHOW(wlp_dev_prim_OUI, wlp_dev_prim_OUI_show, wlp);
i1480u_STORE(wlp_dev_prim_OUI, wlp_dev_prim_OUI_store, wlp);
i1480u_ATTR(wlp_dev_prim_OUI, S_IRUGO | S_IWUSR);
i1480u_SHOW(wlp_dev_prim_OUI_sub, wlp_dev_prim_OUI_sub_show, wlp);
i1480u_STORE(wlp_dev_prim_OUI_sub, wlp_dev_prim_OUI_sub_store, wlp);
i1480u_ATTR(wlp_dev_prim_OUI_sub, S_IRUGO | S_IWUSR);
i1480u_SHOW(wlp_dev_prim_subcat, wlp_dev_prim_subcat_show, wlp);
i1480u_STORE(wlp_dev_prim_subcat, wlp_dev_prim_subcat_store, wlp);
i1480u_ATTR(wlp_dev_prim_subcat, S_IRUGO | S_IWUSR);
i1480u_SHOW(wlp_neighborhood, wlp_neighborhood_show, wlp);
i1480u_ATTR_SHOW(wlp_neighborhood);
i1480u_SHOW(wss_activate, wlp_wss_activate_show, wlp.wss);
i1480u_STORE(wss_activate, wlp_wss_activate_store, wlp.wss);
i1480u_ATTR(wss_activate, S_IRUGO | S_IWUSR);
/*
* Show the (min, max, avg) Line Quality Estimate (LQE, in dB) as over
* the last 256 received WLP frames (ECMA-368 13.3).
*
* [the -7dB that have to be substracted from the LQI to make the LQE
* are already taken into account].
*/
i1480u_SHOW(wlp_lqe, stats_show, lqe_stats);
i1480u_STORE(wlp_lqe, stats_store, lqe_stats);
i1480u_ATTR(wlp_lqe, S_IRUGO | S_IWUSR);
/*
* Show the Receive Signal Strength Indicator averaged over all the
* received WLP frames (ECMA-368 13.3). Still is not clear what
* this value is, but is kind of a percentage of the signal strength
* at the antenna.
*/
i1480u_SHOW(wlp_rssi, stats_show, rssi_stats);
i1480u_STORE(wlp_rssi, stats_store, rssi_stats);
i1480u_ATTR(wlp_rssi, S_IRUGO | S_IWUSR);
/**
* We maintain a basic flow control counter. "count" how many TX URBs are
* outstanding. Only allow "max"
* TX URBs to be outstanding. If this value is reached the queue will be
* stopped. The queue will be restarted when there are
* "threshold" URBs outstanding.
*/
i1480u_SHOW(wlp_tx_inflight, wlp_tx_inflight_show, tx_inflight);
i1480u_STORE(wlp_tx_inflight, wlp_tx_inflight_store, tx_inflight);
i1480u_ATTR(wlp_tx_inflight, S_IRUGO | S_IWUSR);
static struct attribute *i1480u_attrs[] = {
&i1480u_ATTR_NAME(uwb_phy_rate).attr,
&i1480u_ATTR_NAME(uwb_rts_cts).attr,
&i1480u_ATTR_NAME(uwb_ack_policy).attr,
&i1480u_ATTR_NAME(uwb_pca_base_priority).attr,
&i1480u_ATTR_NAME(wlp_lqe).attr,
&i1480u_ATTR_NAME(wlp_rssi).attr,
&i1480u_ATTR_NAME(wlp_eda).attr,
&i1480u_ATTR_NAME(wlp_uuid).attr,
&i1480u_ATTR_NAME(wlp_dev_name).attr,
&i1480u_ATTR_NAME(wlp_dev_manufacturer).attr,
&i1480u_ATTR_NAME(wlp_dev_model_name).attr,
&i1480u_ATTR_NAME(wlp_dev_model_nr).attr,
&i1480u_ATTR_NAME(wlp_dev_serial).attr,
&i1480u_ATTR_NAME(wlp_dev_prim_category).attr,
&i1480u_ATTR_NAME(wlp_dev_prim_OUI).attr,
&i1480u_ATTR_NAME(wlp_dev_prim_OUI_sub).attr,
&i1480u_ATTR_NAME(wlp_dev_prim_subcat).attr,
&i1480u_ATTR_NAME(wlp_neighborhood).attr,
&i1480u_ATTR_NAME(wss_activate).attr,
&i1480u_ATTR_NAME(wlp_tx_inflight).attr,
NULL,
};
static struct attribute_group i1480u_attr_group = {
.name = NULL, /* we want them in the same directory */
.attrs = i1480u_attrs,
};
int i1480u_sysfs_setup(struct i1480u *i1480u)
{
int result;
struct device *dev = &i1480u->usb_iface->dev;
result = sysfs_create_group(&i1480u->net_dev->dev.kobj,
&i1480u_attr_group);
if (result < 0)
dev_err(dev, "cannot initialize sysfs attributes: %d\n",
result);
return result;
}
void i1480u_sysfs_release(struct i1480u *i1480u)
{
sysfs_remove_group(&i1480u->net_dev->dev.kobj,
&i1480u_attr_group);
}

632
drivers/uwb/i1480/i1480u-wlp/tx.c Normal file
View File

@ -0,0 +1,632 @@
/*
* WUSB Wire Adapter: WLP interface
* Deal with TX (massaging data to transmit, handling it)
*
* Copyright (C) 2005-2006 Intel Corporation
* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
*
* Transmission engine. Get an skb, create from that a WLP transmit
* context, add a WLP TX header (which we keep prefilled in the
* device's instance), fill out the target-specific fields and
* fire it.
*
* ROADMAP:
*
* Entry points:
*
* i1480u_tx_release(): called by i1480u_disconnect() to release
* pending tx contexts.
*
* i1480u_tx_cb(): callback for TX contexts (USB URBs)
* i1480u_tx_destroy():
*
* i1480u_tx_timeout(): called for timeout handling from the
* network stack.
*
* i1480u_hard_start_xmit(): called for transmitting an skb from
* the network stack. Will interact with WLP
* substack to verify and prepare frame.
* i1480u_xmit_frame(): actual transmission on hardware
*
* i1480u_tx_create() Creates TX context
* i1480u_tx_create_1() For packets in 1 fragment
* i1480u_tx_create_n() For packets in >1 fragments
*
* TODO:
*
* - FIXME: rewrite using usb_sg_*(), add asynch support to
* usb_sg_*(). It might not make too much sense as most of
* the times the MTU will be smaller than one page...
*/
#include "i1480u-wlp.h"
#define D_LOCAL 5
#include <linux/uwb/debug.h>
enum {
/* This is only for Next and Last TX packets */
i1480u_MAX_PL_SIZE = i1480u_MAX_FRG_SIZE
- sizeof(struct untd_hdr_rst),
};
/** Free resources allocated to a i1480u tx context. */
static
void i1480u_tx_free(struct i1480u_tx *wtx)
{
kfree(wtx->buf);
if (wtx->skb)
dev_kfree_skb_irq(wtx->skb);
usb_free_urb(wtx->urb);
kfree(wtx);
}
static
void i1480u_tx_destroy(struct i1480u *i1480u, struct i1480u_tx *wtx)
{
unsigned long flags;
spin_lock_irqsave(&i1480u->tx_list_lock, flags); /* not active any more */
list_del(&wtx->list_node);
i1480u_tx_free(wtx);
spin_unlock_irqrestore(&i1480u->tx_list_lock, flags);
}
static
void i1480u_tx_unlink_urbs(struct i1480u *i1480u)
{
unsigned long flags;
struct i1480u_tx *wtx, *next;
spin_lock_irqsave(&i1480u->tx_list_lock, flags);
list_for_each_entry_safe(wtx, next, &i1480u->tx_list, list_node) {
usb_unlink_urb(wtx->urb);
}
spin_unlock_irqrestore(&i1480u->tx_list_lock, flags);
}
/**
* Callback for a completed tx USB URB.
*
* TODO:
*
* - FIXME: recover errors more gracefully
* - FIXME: handle NAKs (I dont think they come here) for flow ctl
*/
static
void i1480u_tx_cb(struct urb *urb)
{
struct i1480u_tx *wtx = urb->context;
struct i1480u *i1480u = wtx->i1480u;
struct net_device *net_dev = i1480u->net_dev;
struct device *dev = &i1480u->usb_iface->dev;
unsigned long flags;
switch (urb->status) {
case 0:
spin_lock_irqsave(&i1480u->lock, flags);
i1480u->stats.tx_packets++;
i1480u->stats.tx_bytes += urb->actual_length;
spin_unlock_irqrestore(&i1480u->lock, flags);
break;
case -ECONNRESET: /* Not an error, but a controlled situation; */
case -ENOENT: /* (we killed the URB)...so, no broadcast */
dev_dbg(dev, "notif endp: reset/noent %d\n", urb->status);
netif_stop_queue(net_dev);
break;
case -ESHUTDOWN: /* going away! */
dev_dbg(dev, "notif endp: down %d\n", urb->status);
netif_stop_queue(net_dev);
break;
default:
dev_err(dev, "TX: unknown URB status %d\n", urb->status);
if (edc_inc(&i1480u->tx_errors, EDC_MAX_ERRORS,
EDC_ERROR_TIMEFRAME)) {
dev_err(dev, "TX: max acceptable errors exceeded."
"Reset device.\n");
netif_stop_queue(net_dev);
i1480u_tx_unlink_urbs(i1480u);
wlp_reset_all(&i1480u->wlp);
}
break;
}
i1480u_tx_destroy(i1480u, wtx);
if (atomic_dec_return(&i1480u->tx_inflight.count)
<= i1480u->tx_inflight.threshold
&& netif_queue_stopped(net_dev)
&& i1480u->tx_inflight.threshold != 0) {
if (d_test(2) && printk_ratelimit())
d_printf(2, dev, "Restart queue. \n");
netif_start_queue(net_dev);
atomic_inc(&i1480u->tx_inflight.restart_count);
}
return;
}
/**
* Given a buffer that doesn't fit in a single fragment, create an
* scatter/gather structure for delivery to the USB pipe.
*
* Implements functionality of i1480u_tx_create().
*
* @wtx: tx descriptor
* @skb: skb to send
* @gfp_mask: gfp allocation mask
* @returns: Pointer to @wtx if ok, NULL on error.
*
* Sorry, TOO LONG a function, but breaking it up is kind of hard
*
* This will break the buffer in chunks smaller than
* i1480u_MAX_FRG_SIZE (including the header) and add proper headers
* to each:
*
* 1st header \
* i1480 tx header | fragment 1
* fragment data /
* nxt header \ fragment 2
* fragment data /
* ..
* ..
* last header \ fragment 3
* last fragment data /
*
* This does not fill the i1480 TX header, it is left up to the
* caller to do that; you can get it from @wtx->wlp_tx_hdr.
*
* This function consumes the skb unless there is an error.
*/
static
int i1480u_tx_create_n(struct i1480u_tx *wtx, struct sk_buff *skb,
gfp_t gfp_mask)
{
int result;
void *pl;
size_t pl_size;
void *pl_itr, *buf_itr;
size_t pl_size_left, frgs, pl_size_1st, frg_pl_size = 0;
struct untd_hdr_1st *untd_hdr_1st;
struct wlp_tx_hdr *wlp_tx_hdr;
struct untd_hdr_rst *untd_hdr_rst;
wtx->skb = NULL;
pl = skb->data;
pl_itr = pl;
pl_size = skb->len;
pl_size_left = pl_size; /* payload size */
/* First fragment; fits as much as i1480u_MAX_FRG_SIZE minus
* the headers */
pl_size_1st = i1480u_MAX_FRG_SIZE
- sizeof(struct untd_hdr_1st) - sizeof(struct wlp_tx_hdr);
BUG_ON(pl_size_1st > pl_size);
pl_size_left -= pl_size_1st;
/* The rest have an smaller header (no i1480 TX header). We
* need to break up the payload in blocks smaller than
* i1480u_MAX_PL_SIZE (payload excluding header). */
frgs = (pl_size_left + i1480u_MAX_PL_SIZE - 1) / i1480u_MAX_PL_SIZE;
/* Allocate space for the new buffer. In this new buffer we'll
* place the headers followed by the data fragment, headers,
* data fragments, etc..
*/
result = -ENOMEM;
wtx->buf_size = sizeof(*untd_hdr_1st)
+ sizeof(*wlp_tx_hdr)
+ frgs * sizeof(*untd_hdr_rst)
+ pl_size;
wtx->buf = kmalloc(wtx->buf_size, gfp_mask);
if (wtx->buf == NULL)
goto error_buf_alloc;
buf_itr = wtx->buf; /* We got the space, let's fill it up */
/* Fill 1st fragment */
untd_hdr_1st = buf_itr;
buf_itr += sizeof(*untd_hdr_1st);
untd_hdr_set_type(&untd_hdr_1st->hdr, i1480u_PKT_FRAG_1ST);
untd_hdr_set_rx_tx(&untd_hdr_1st->hdr, 0);
untd_hdr_1st->hdr.len = cpu_to_le16(pl_size + sizeof(*wlp_tx_hdr));
untd_hdr_1st->fragment_len =
cpu_to_le16(pl_size_1st + sizeof(*wlp_tx_hdr));
memset(untd_hdr_1st->padding, 0, sizeof(untd_hdr_1st->padding));
/* Set up i1480 header info */
wlp_tx_hdr = wtx->wlp_tx_hdr = buf_itr;
buf_itr += sizeof(*wlp_tx_hdr);
/* Copy the first fragment */
memcpy(buf_itr, pl_itr, pl_size_1st);
pl_itr += pl_size_1st;
buf_itr += pl_size_1st;
/* Now do each remaining fragment */
result = -EINVAL;
while (pl_size_left > 0) {
d_printf(5, NULL, "ITR HDR: pl_size_left %zu buf_itr %zu\n",
pl_size_left, buf_itr - wtx->buf);
if (buf_itr + sizeof(*untd_hdr_rst) - wtx->buf
> wtx->buf_size) {
printk(KERN_ERR "BUG: no space for header\n");
goto error_bug;
}
d_printf(5, NULL, "ITR HDR 2: pl_size_left %zu buf_itr %zu\n",
pl_size_left, buf_itr - wtx->buf);
untd_hdr_rst = buf_itr;
buf_itr += sizeof(*untd_hdr_rst);
if (pl_size_left > i1480u_MAX_PL_SIZE) {
frg_pl_size = i1480u_MAX_PL_SIZE;
untd_hdr_set_type(&untd_hdr_rst->hdr, i1480u_PKT_FRAG_NXT);
} else {
frg_pl_size = pl_size_left;
untd_hdr_set_type(&untd_hdr_rst->hdr, i1480u_PKT_FRAG_LST);
}
d_printf(5, NULL,
"ITR PL: pl_size_left %zu buf_itr %zu frg_pl_size %zu\n",
pl_size_left, buf_itr - wtx->buf, frg_pl_size);
untd_hdr_set_rx_tx(&untd_hdr_rst->hdr, 0);
untd_hdr_rst->hdr.len = cpu_to_le16(frg_pl_size);
untd_hdr_rst->padding = 0;
if (buf_itr + frg_pl_size - wtx->buf
> wtx->buf_size) {
printk(KERN_ERR "BUG: no space for payload\n");
goto error_bug;
}
memcpy(buf_itr, pl_itr, frg_pl_size);
buf_itr += frg_pl_size;
pl_itr += frg_pl_size;
pl_size_left -= frg_pl_size;
d_printf(5, NULL,
"ITR PL 2: pl_size_left %zu buf_itr %zu frg_pl_size %zu\n",
pl_size_left, buf_itr - wtx->buf, frg_pl_size);
}
dev_kfree_skb_irq(skb);
return 0;
error_bug:
printk(KERN_ERR
"BUG: skb %u bytes\n"
"BUG: frg_pl_size %zd i1480u_MAX_FRG_SIZE %u\n"
"BUG: buf_itr %zu buf_size %zu pl_size_left %zu\n",
skb->len,
frg_pl_size, i1480u_MAX_FRG_SIZE,
buf_itr - wtx->buf, wtx->buf_size, pl_size_left);
kfree(wtx->buf);
error_buf_alloc:
return result;
}
/**
* Given a buffer that fits in a single fragment, fill out a @wtx
* struct for transmitting it down the USB pipe.
*
* Uses the fact that we have space reserved in front of the skbuff
* for hardware headers :]
*
* This does not fill the i1480 TX header, it is left up to the
* caller to do that; you can get it from @wtx->wlp_tx_hdr.
*
* @pl: pointer to payload data
* @pl_size: size of the payuload
*
* This function does not consume the @skb.
*/
static
int i1480u_tx_create_1(struct i1480u_tx *wtx, struct sk_buff *skb,
gfp_t gfp_mask)
{
struct untd_hdr_cmp *untd_hdr_cmp;
struct wlp_tx_hdr *wlp_tx_hdr;
wtx->buf = NULL;
wtx->skb = skb;
BUG_ON(skb_headroom(skb) < sizeof(*wlp_tx_hdr));
wlp_tx_hdr = (void *) __skb_push(skb, sizeof(*wlp_tx_hdr));
wtx->wlp_tx_hdr = wlp_tx_hdr;
BUG_ON(skb_headroom(skb) < sizeof(*untd_hdr_cmp));
untd_hdr_cmp = (void *) __skb_push(skb, sizeof(*untd_hdr_cmp));
untd_hdr_set_type(&untd_hdr_cmp->hdr, i1480u_PKT_FRAG_CMP);
untd_hdr_set_rx_tx(&untd_hdr_cmp->hdr, 0);
untd_hdr_cmp->hdr.len = cpu_to_le16(skb->len - sizeof(*untd_hdr_cmp));
untd_hdr_cmp->padding = 0;
return 0;
}
/**
* Given a skb to transmit, massage it to become palatable for the TX pipe
*
* This will break the buffer in chunks smaller than
* i1480u_MAX_FRG_SIZE and add proper headers to each.
*
* 1st header \
* i1480 tx header | fragment 1
* fragment data /
* nxt header \ fragment 2
* fragment data /
* ..
* ..
* last header \ fragment 3
* last fragment data /
*
* Each fragment will be always smaller or equal to i1480u_MAX_FRG_SIZE.
*
* If the first fragment is smaller than i1480u_MAX_FRG_SIZE, then the
* following is composed:
*
* complete header \
* i1480 tx header | single fragment
* packet data /
*
* We were going to use s/g support, but because the interface is
* synch and at the end there is plenty of overhead to do it, it
* didn't seem that worth for data that is going to be smaller than
* one page.
*/
static
struct i1480u_tx *i1480u_tx_create(struct i1480u *i1480u,
struct sk_buff *skb, gfp_t gfp_mask)
{
int result;
struct usb_endpoint_descriptor *epd;
int usb_pipe;
unsigned long flags;
struct i1480u_tx *wtx;
const size_t pl_max_size =
i1480u_MAX_FRG_SIZE - sizeof(struct untd_hdr_cmp)
- sizeof(struct wlp_tx_hdr);
wtx = kmalloc(sizeof(*wtx), gfp_mask);
if (wtx == NULL)
goto error_wtx_alloc;
wtx->urb = usb_alloc_urb(0, gfp_mask);
if (wtx->urb == NULL)
goto error_urb_alloc;
epd = &i1480u->usb_iface->cur_altsetting->endpoint[2].desc;
usb_pipe = usb_sndbulkpipe(i1480u->usb_dev, epd->bEndpointAddress);
/* Fits in a single complete packet or need to split? */
if (skb->len > pl_max_size) {
result = i1480u_tx_create_n(wtx, skb, gfp_mask);
if (result < 0)
goto error_create;
usb_fill_bulk_urb(wtx->urb, i1480u->usb_dev, usb_pipe,
wtx->buf, wtx->buf_size, i1480u_tx_cb, wtx);
} else {
result = i1480u_tx_create_1(wtx, skb, gfp_mask);
if (result < 0)
goto error_create;
usb_fill_bulk_urb(wtx->urb, i1480u->usb_dev, usb_pipe,
skb->data, skb->len, i1480u_tx_cb, wtx);
}
spin_lock_irqsave(&i1480u->tx_list_lock, flags);
list_add(&wtx->list_node, &i1480u->tx_list);
spin_unlock_irqrestore(&i1480u->tx_list_lock, flags);
return wtx;
error_create:
kfree(wtx->urb);
error_urb_alloc:
kfree(wtx);
error_wtx_alloc:
return NULL;
}
/**
* Actual fragmentation and transmission of frame
*
* @wlp: WLP substack data structure
* @skb: To be transmitted
* @dst: Device address of destination
* @returns: 0 on success, <0 on failure
*
* This function can also be called directly (not just from
* hard_start_xmit), so we also check here if the interface is up before
* taking sending anything.
*/
int i1480u_xmit_frame(struct wlp *wlp, struct sk_buff *skb,
struct uwb_dev_addr *dst)
{
int result = -ENXIO;
struct i1480u *i1480u = container_of(wlp, struct i1480u, wlp);
struct device *dev = &i1480u->usb_iface->dev;
struct net_device *net_dev = i1480u->net_dev;
struct i1480u_tx *wtx;
struct wlp_tx_hdr *wlp_tx_hdr;
static unsigned char dev_bcast[2] = { 0xff, 0xff };
#if 0
int lockup = 50;
#endif
d_fnstart(6, dev, "(skb %p (%u), net_dev %p)\n", skb, skb->len,
net_dev);
BUG_ON(i1480u->wlp.rc == NULL);
if ((net_dev->flags & IFF_UP) == 0)
goto out;
result = -EBUSY;
if (atomic_read(&i1480u->tx_inflight.count) >= i1480u->tx_inflight.max) {
if (d_test(2) && printk_ratelimit())
d_printf(2, dev, "Max frames in flight "
"stopping queue.\n");
netif_stop_queue(net_dev);
goto error_max_inflight;
}
result = -ENOMEM;
wtx = i1480u_tx_create(i1480u, skb, GFP_ATOMIC);
if (unlikely(wtx == NULL)) {
if (printk_ratelimit())
dev_err(dev, "TX: no memory for WLP TX URB,"
"dropping packet (in flight %d)\n",
atomic_read(&i1480u->tx_inflight.count));
netif_stop_queue(net_dev);
goto error_wtx_alloc;
}
wtx->i1480u = i1480u;
/* Fill out the i1480 header; @i1480u->def_tx_hdr read without
* locking. We do so because they are kind of orthogonal to
* each other (and thus not changed in an atomic batch).
* The ETH header is right after the WLP TX header. */
wlp_tx_hdr = wtx->wlp_tx_hdr;
*wlp_tx_hdr = i1480u->options.def_tx_hdr;
wlp_tx_hdr->dstaddr = *dst;
if (!memcmp(&wlp_tx_hdr->dstaddr, dev_bcast, sizeof(dev_bcast))
&& (wlp_tx_hdr_delivery_id_type(wlp_tx_hdr) & WLP_DRP)) {
/*Broadcast message directed to DRP host. Send as best effort
* on PCA. */
wlp_tx_hdr_set_delivery_id_type(wlp_tx_hdr, i1480u->options.pca_base_priority);
}
#if 0
dev_info(dev, "TX delivering skb -> USB, %zu bytes\n", skb->len);
dump_bytes(dev, skb->data, skb->len > 72 ? 72 : skb->len);
#endif
#if 0
/* simulates a device lockup after every lockup# packets */
if (lockup && ((i1480u->stats.tx_packets + 1) % lockup) == 0) {
/* Simulate a dropped transmit interrupt */
net_dev->trans_start = jiffies;
netif_stop_queue(net_dev);
dev_err(dev, "Simulate lockup at %ld\n", jiffies);
return result;
}
#endif
result = usb_submit_urb(wtx->urb, GFP_ATOMIC); /* Go baby */
if (result < 0) {
dev_err(dev, "TX: cannot submit URB: %d\n", result);
/* We leave the freeing of skb to calling function */
wtx->skb = NULL;
goto error_tx_urb_submit;
}
atomic_inc(&i1480u->tx_inflight.count);
net_dev->trans_start = jiffies;
d_fnend(6, dev, "(skb %p (%u), net_dev %p) = %d\n", skb, skb->len,
net_dev, result);
return result;
error_tx_urb_submit:
i1480u_tx_destroy(i1480u, wtx);
error_wtx_alloc:
error_max_inflight:
out:
d_fnend(6, dev, "(skb %p (%u), net_dev %p) = %d\n", skb, skb->len,
net_dev, result);
return result;
}
/**
* Transmit an skb Called when an skbuf has to be transmitted
*
* The skb is first passed to WLP substack to ensure this is a valid
* frame. If valid the device address of destination will be filled and
* the WLP header prepended to the skb. If this step fails we fake sending
* the frame, if we return an error the network stack will just keep trying.
*
* Broadcast frames inside a WSS needs to be treated special as multicast is
* not supported. A broadcast frame is sent as unicast to each member of the
* WSS - this is done by the WLP substack when it finds a broadcast frame.
* So, we test if the WLP substack took over the skb and only transmit it
* if it has not (been taken over).
*
* @net_dev->xmit_lock is held
*/
int i1480u_hard_start_xmit(struct sk_buff *skb, struct net_device *net_dev)
{
int result;
struct i1480u *i1480u = netdev_priv(net_dev);
struct device *dev = &i1480u->usb_iface->dev;
struct uwb_dev_addr dst;
d_fnstart(6, dev, "(skb %p (%u), net_dev %p)\n", skb, skb->len,
net_dev);
BUG_ON(i1480u->wlp.rc == NULL);
if ((net_dev->flags & IFF_UP) == 0)
goto error;
result = wlp_prepare_tx_frame(dev, &i1480u->wlp, skb, &dst);
if (result < 0) {
dev_err(dev, "WLP verification of TX frame failed (%d). "
"Dropping packet.\n", result);
goto error;
} else if (result == 1) {
d_printf(6, dev, "WLP will transmit frame. \n");
/* trans_start time will be set when WLP actually transmits
* the frame */
goto out;
}
d_printf(6, dev, "Transmitting frame. \n");
result = i1480u_xmit_frame(&i1480u->wlp, skb, &dst);
if (result < 0) {
dev_err(dev, "Frame TX failed (%d).\n", result);
goto error;
}
d_fnend(6, dev, "(skb %p (%u), net_dev %p) = %d\n", skb, skb->len,
net_dev, result);
return NETDEV_TX_OK;
error:
dev_kfree_skb_any(skb);
i1480u->stats.tx_dropped++;
out:
d_fnend(6, dev, "(skb %p (%u), net_dev %p) = %d\n", skb, skb->len,
net_dev, result);
return NETDEV_TX_OK;
}
/**
* Called when a pkt transmission doesn't complete in a reasonable period
* Device reset may sleep - do it outside of interrupt context (delayed)
*/
void i1480u_tx_timeout(struct net_device *net_dev)
{
struct i1480u *i1480u = netdev_priv(net_dev);
wlp_reset_all(&i1480u->wlp);
}
void i1480u_tx_release(struct i1480u *i1480u)
{
unsigned long flags;
struct i1480u_tx *wtx, *next;
int count = 0, empty;
spin_lock_irqsave(&i1480u->tx_list_lock, flags);
list_for_each_entry_safe(wtx, next, &i1480u->tx_list, list_node) {
count++;
usb_unlink_urb(wtx->urb);
}
spin_unlock_irqrestore(&i1480u->tx_list_lock, flags);
count = count*10; /* i1480ut 200ms per unlinked urb (intervals of 20ms) */
/*
* We don't like this sollution too much (dirty as it is), but
* it is cheaper than putting a refcount on each i1480u_tx and
* i1480uting for all of them to go away...
*
* Called when no more packets can be added to tx_list
* so can i1480ut for it to be empty.
*/
while (1) {
spin_lock_irqsave(&i1480u->tx_list_lock, flags);
empty = list_empty(&i1480u->tx_list);
spin_unlock_irqrestore(&i1480u->tx_list_lock, flags);
if (empty)
break;
count--;
BUG_ON(count == 0);
msleep(20);
}
}