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linux-next/include/linux/usb/usbnet.h
Ming Lei 60e453a940 USBNET: fix handling padding packet 
Commit 638c5115a7949(USBNET: support DMA SG) introduces DMA SG
if the usb host controller is capable of building packet from
discontinuous buffers, but missed handling padding packet when
building DMA SG.

This patch attachs the pre-allocated padding packet at the
end of the sg list, so padding packet can be sent to device
if drivers require that.

Reported-by: David Laight <David.Laight@aculab.com>
Acked-by: Oliver Neukum <oliver@neukum.org>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-09-28 15:42:49 -04:00

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/*
* USB Networking Link Interface
*
* Copyright (C) 2000-2005 by David Brownell <dbrownell@users.sourceforge.net>
* Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
*
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef __LINUX_USB_USBNET_H
#define __LINUX_USB_USBNET_H
/* interface from usbnet core to each USB networking link we handle */
struct usbnet {
/* housekeeping */
struct usb_device *udev;
struct usb_interface *intf;
struct driver_info *driver_info;
const char *driver_name;
void *driver_priv;
wait_queue_head_t *wait;
struct mutex phy_mutex;
unsigned char suspend_count;
unsigned char pkt_cnt, pkt_err;
unsigned short rx_qlen, tx_qlen;
unsigned can_dma_sg:1;
/* i/o info: pipes etc */
unsigned in, out;
struct usb_host_endpoint *status;
unsigned maxpacket;
struct timer_list delay;
const char *padding_pkt;
/* protocol/interface state */
struct net_device *net;
int msg_enable;
unsigned long data[5];
u32 xid;
u32 hard_mtu; /* count any extra framing */
size_t rx_urb_size; /* size for rx urbs */
struct mii_if_info mii;
/* various kinds of pending driver work */
struct sk_buff_head rxq;
struct sk_buff_head txq;
struct sk_buff_head done;
struct sk_buff_head rxq_pause;
struct urb *interrupt;
unsigned interrupt_count;
struct mutex interrupt_mutex;
struct usb_anchor deferred;
struct tasklet_struct bh;
struct work_struct kevent;
unsigned long flags;
# define EVENT_TX_HALT 0
# define EVENT_RX_HALT 1
# define EVENT_RX_MEMORY 2
# define EVENT_STS_SPLIT 3
# define EVENT_LINK_RESET 4
# define EVENT_RX_PAUSED 5
# define EVENT_DEV_ASLEEP 6
# define EVENT_DEV_OPEN 7
# define EVENT_DEVICE_REPORT_IDLE 8
# define EVENT_NO_RUNTIME_PM 9
# define EVENT_RX_KILL 10
# define EVENT_LINK_CHANGE 11
};
static inline struct usb_driver *driver_of(struct usb_interface *intf)
{
return to_usb_driver(intf->dev.driver);
}
/* interface from the device/framing level "minidriver" to core */
struct driver_info {
char *description;
int flags;
/* framing is CDC Ethernet, not writing ZLPs (hw issues), or optionally: */
#define FLAG_FRAMING_NC 0x0001 /* guard against device dropouts */
#define FLAG_FRAMING_GL 0x0002 /* genelink batches packets */
#define FLAG_FRAMING_Z 0x0004 /* zaurus adds a trailer */
#define FLAG_FRAMING_RN 0x0008 /* RNDIS batches, plus huge header */
#define FLAG_NO_SETINT 0x0010 /* device can't set_interface() */
#define FLAG_ETHER 0x0020 /* maybe use "eth%d" names */
#define FLAG_FRAMING_AX 0x0040 /* AX88772/178 packets */
#define FLAG_WLAN 0x0080 /* use "wlan%d" names */
#define FLAG_AVOID_UNLINK_URBS 0x0100 /* don't unlink urbs at usbnet_stop() */
#define FLAG_SEND_ZLP 0x0200 /* hw requires ZLPs are sent */
#define FLAG_WWAN 0x0400 /* use "wwan%d" names */
#define FLAG_LINK_INTR 0x0800 /* updates link (carrier) status */
#define FLAG_POINTTOPOINT 0x1000 /* possibly use "usb%d" names */
/*
* Indicates to usbnet, that USB driver accumulates multiple IP packets.
* Affects statistic (counters) and short packet handling.
*/
#define FLAG_MULTI_PACKET 0x2000
#define FLAG_RX_ASSEMBLE 0x4000 /* rx packets may span >1 frames */
#define FLAG_NOARP 0x8000 /* device can't do ARP */
/* init device ... can sleep, or cause probe() failure */
int (*bind)(struct usbnet *, struct usb_interface *);
/* cleanup device ... can sleep, but can't fail */
void (*unbind)(struct usbnet *, struct usb_interface *);
/* reset device ... can sleep */
int (*reset)(struct usbnet *);
/* stop device ... can sleep */
int (*stop)(struct usbnet *);
/* see if peer is connected ... can sleep */
int (*check_connect)(struct usbnet *);
/* (dis)activate runtime power management */
int (*manage_power)(struct usbnet *, int);
/* for status polling */
void (*status)(struct usbnet *, struct urb *);
/* link reset handling, called from defer_kevent */
int (*link_reset)(struct usbnet *);
/* fixup rx packet (strip framing) */
int (*rx_fixup)(struct usbnet *dev, struct sk_buff *skb);
/* fixup tx packet (add framing) */
struct sk_buff *(*tx_fixup)(struct usbnet *dev,
struct sk_buff *skb, gfp_t flags);
/* early initialization code, can sleep. This is for minidrivers
* having 'subminidrivers' that need to do extra initialization
* right after minidriver have initialized hardware. */
int (*early_init)(struct usbnet *dev);
/* called by minidriver when receiving indication */
void (*indication)(struct usbnet *dev, void *ind, int indlen);
/* for new devices, use the descriptor-reading code instead */
int in; /* rx endpoint */
int out; /* tx endpoint */
unsigned long data; /* Misc driver specific data */
};
/* Minidrivers are just drivers using the "usbnet" core as a powerful
* network-specific subroutine library ... that happens to do pretty
* much everything except custom framing and chip-specific stuff.
*/
extern int usbnet_probe(struct usb_interface *, const struct usb_device_id *);
extern int usbnet_suspend(struct usb_interface *, pm_message_t);
extern int usbnet_resume(struct usb_interface *);
extern void usbnet_disconnect(struct usb_interface *);
extern void usbnet_device_suggests_idle(struct usbnet *dev);
extern int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
u16 value, u16 index, void *data, u16 size);
extern int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
u16 value, u16 index, const void *data, u16 size);
extern int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
u16 value, u16 index, void *data, u16 size);
extern int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
u16 value, u16 index, const void *data, u16 size);
extern int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype,
u16 value, u16 index, const void *data, u16 size);
/* Drivers that reuse some of the standard USB CDC infrastructure
* (notably, using multiple interfaces according to the CDC
* union descriptor) get some helper code.
*/
struct cdc_state {
struct usb_cdc_header_desc *header;
struct usb_cdc_union_desc *u;
struct usb_cdc_ether_desc *ether;
struct usb_interface *control;
struct usb_interface *data;
};
extern int usbnet_generic_cdc_bind(struct usbnet *, struct usb_interface *);
extern int usbnet_cdc_bind(struct usbnet *, struct usb_interface *);
extern void usbnet_cdc_unbind(struct usbnet *, struct usb_interface *);
extern void usbnet_cdc_status(struct usbnet *, struct urb *);
/* CDC and RNDIS support the same host-chosen packet filters for IN transfers */
#define DEFAULT_FILTER (USB_CDC_PACKET_TYPE_BROADCAST \
|USB_CDC_PACKET_TYPE_ALL_MULTICAST \
|USB_CDC_PACKET_TYPE_PROMISCUOUS \
|USB_CDC_PACKET_TYPE_DIRECTED)
/* we record the state for each of our queued skbs */
enum skb_state {
illegal = 0,
tx_start, tx_done,
rx_start, rx_done, rx_cleanup,
unlink_start
};
struct skb_data { /* skb->cb is one of these */
struct urb *urb;
struct usbnet *dev;
enum skb_state state;
size_t length;
};
extern int usbnet_open(struct net_device *net);
extern int usbnet_stop(struct net_device *net);
extern netdev_tx_t usbnet_start_xmit(struct sk_buff *skb,
struct net_device *net);
extern void usbnet_tx_timeout(struct net_device *net);
extern int usbnet_change_mtu(struct net_device *net, int new_mtu);
extern int usbnet_get_endpoints(struct usbnet *, struct usb_interface *);
extern int usbnet_get_ethernet_addr(struct usbnet *, int);
extern void usbnet_defer_kevent(struct usbnet *, int);
extern void usbnet_skb_return(struct usbnet *, struct sk_buff *);
extern void usbnet_unlink_rx_urbs(struct usbnet *);
extern void usbnet_pause_rx(struct usbnet *);
extern void usbnet_resume_rx(struct usbnet *);
extern void usbnet_purge_paused_rxq(struct usbnet *);
extern int usbnet_get_settings(struct net_device *net,
struct ethtool_cmd *cmd);
extern int usbnet_set_settings(struct net_device *net,
struct ethtool_cmd *cmd);
extern u32 usbnet_get_link(struct net_device *net);
extern u32 usbnet_get_msglevel(struct net_device *);
extern void usbnet_set_msglevel(struct net_device *, u32);
extern void usbnet_get_drvinfo(struct net_device *, struct ethtool_drvinfo *);
extern int usbnet_nway_reset(struct net_device *net);
extern int usbnet_manage_power(struct usbnet *, int);
extern void usbnet_link_change(struct usbnet *, bool, bool);
extern int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags);
extern void usbnet_status_stop(struct usbnet *dev);
extern void usbnet_update_max_qlen(struct usbnet *dev);
#endif /* __LINUX_USB_USBNET_H */
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