4546548789
This is a new generic kernel FIFO implementation.
The current kernel fifo API is not very widely used, because it has to
many constrains. Only 17 files in the current 2.6.31-rc5 used it.
FIFO's are like list's a very basic thing and a kfifo API which handles
the most use case would save a lot of development time and memory
resources.
I think this are the reasons why kfifo is not in use:
- The API is to simple, important functions are missing
- A fifo can be only allocated dynamically
- There is a requirement of a spinlock whether you need it or not
- There is no support for data records inside a fifo
So I decided to extend the kfifo in a more generic way without blowing up
the API to much. The new API has the following benefits:
- Generic usage: For kernel internal use and/or device driver.
- Provide an API for the most use case.
- Slim API: The whole API provides 25 functions.
- Linux style habit.
- DECLARE_KFIFO, DEFINE_KFIFO and INIT_KFIFO Macros
- Direct copy_to_user from the fifo and copy_from_user into the fifo.
- The kfifo itself is an in place member of the using data structure, this save an
indirection access and does not waste the kernel allocator.
- Lockless access: if only one reader and one writer is active on the fifo,
which is the common use case, no additional locking is necessary.
- Remove spinlock - give the user the freedom of choice what kind of locking to use if
one is required.
- Ability to handle records. Three type of records are supported:
- Variable length records between 0-255 bytes, with a record size
field of 1 bytes.
- Variable length records between 0-65535 bytes, with a record size
field of 2 bytes.
- Fixed size records, which no record size field.
- Preserve memory resource.
- Performance!
- Easy to use!
This patch:
Since most users want to have the kfifo as part of another object,
reorganize the code to allow including struct kfifo in another data
structure. This requires changing the kfifo_alloc and kfifo_init
prototypes so that we pass an existing kfifo pointer into them. This
patch changes the implementation and all existing users.
[akpm@linux-foundation.org: fix warning]
Signed-off-by: Stefani Seibold <stefani@seibold.net>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Acked-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
209 lines
4.9 KiB
C
209 lines
4.9 KiB
C
/**
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* This file contains definitions and data structures specific
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* to Marvell 802.11 NIC. It contains the Device Information
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* structure struct lbs_private..
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*/
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#ifndef _LBS_DEV_H_
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#define _LBS_DEV_H_
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#include "mesh.h"
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#include "scan.h"
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#include "assoc.h"
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#include <linux/kfifo.h>
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/** sleep_params */
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struct sleep_params {
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uint16_t sp_error;
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uint16_t sp_offset;
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uint16_t sp_stabletime;
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uint8_t sp_calcontrol;
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uint8_t sp_extsleepclk;
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uint16_t sp_reserved;
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};
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/** Private structure for the MV device */
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struct lbs_private {
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/* Basic networking */
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struct net_device *dev;
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u32 connect_status;
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int infra_open;
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struct work_struct mcast_work;
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u32 nr_of_multicastmacaddr;
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u8 multicastlist[MRVDRV_MAX_MULTICAST_LIST_SIZE][ETH_ALEN];
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/* CFG80211 */
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struct wireless_dev *wdev;
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/* Mesh */
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struct net_device *mesh_dev; /* Virtual device */
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u32 mesh_connect_status;
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struct lbs_mesh_stats mstats;
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int mesh_open;
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int mesh_fw_ver;
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int mesh_autostart_enabled;
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uint16_t mesh_tlv;
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u8 mesh_ssid[IEEE80211_MAX_SSID_LEN + 1];
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u8 mesh_ssid_len;
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struct work_struct sync_channel;
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/* Monitor mode */
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struct net_device *rtap_net_dev;
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u32 monitormode;
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/* Debugfs */
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struct dentry *debugfs_dir;
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struct dentry *debugfs_debug;
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struct dentry *debugfs_files[6];
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struct dentry *events_dir;
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struct dentry *debugfs_events_files[6];
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struct dentry *regs_dir;
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struct dentry *debugfs_regs_files[6];
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/* Hardware debugging */
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u32 mac_offset;
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u32 bbp_offset;
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u32 rf_offset;
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struct lbs_offset_value offsetvalue;
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/* Power management */
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u16 psmode;
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u32 psstate;
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u8 needtowakeup;
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/* Deep sleep */
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int is_deep_sleep;
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int is_auto_deep_sleep_enabled;
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int wakeup_dev_required;
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int is_activity_detected;
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int auto_deep_sleep_timeout; /* in ms */
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wait_queue_head_t ds_awake_q;
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struct timer_list auto_deepsleep_timer;
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/* Hardware access */
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void *card;
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u8 fw_ready;
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u8 surpriseremoved;
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int (*hw_host_to_card) (struct lbs_private *priv, u8 type, u8 *payload, u16 nb);
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void (*reset_card) (struct lbs_private *priv);
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int (*enter_deep_sleep) (struct lbs_private *priv);
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int (*exit_deep_sleep) (struct lbs_private *priv);
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int (*reset_deep_sleep_wakeup) (struct lbs_private *priv);
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/* Adapter info (from EEPROM) */
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u32 fwrelease;
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u32 fwcapinfo;
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u16 regioncode;
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u8 current_addr[ETH_ALEN];
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/* Command download */
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u8 dnld_sent;
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/* bit0 1/0=data_sent/data_tx_done,
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bit1 1/0=cmd_sent/cmd_tx_done,
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all other bits reserved 0 */
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u16 seqnum;
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struct cmd_ctrl_node *cmd_array;
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struct cmd_ctrl_node *cur_cmd;
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struct list_head cmdfreeq; /* free command buffers */
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struct list_head cmdpendingq; /* pending command buffers */
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wait_queue_head_t cmd_pending;
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struct timer_list command_timer;
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int nr_retries;
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int cmd_timed_out;
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/* Command responses sent from the hardware to the driver */
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int cur_cmd_retcode;
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u8 resp_idx;
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u8 resp_buf[2][LBS_UPLD_SIZE];
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u32 resp_len[2];
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/* Events sent from hardware to driver */
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struct kfifo event_fifo;
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/** thread to service interrupts */
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struct task_struct *main_thread;
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wait_queue_head_t waitq;
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struct workqueue_struct *work_thread;
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/** Encryption stuff */
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struct lbs_802_11_security secinfo;
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struct enc_key wpa_mcast_key;
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struct enc_key wpa_unicast_key;
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u8 wpa_ie[MAX_WPA_IE_LEN];
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u8 wpa_ie_len;
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u16 wep_tx_keyidx;
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struct enc_key wep_keys[4];
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/* Wake On LAN */
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uint32_t wol_criteria;
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uint8_t wol_gpio;
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uint8_t wol_gap;
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/* Transmitting */
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int tx_pending_len; /* -1 while building packet */
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u8 tx_pending_buf[LBS_UPLD_SIZE];
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/* protected by hard_start_xmit serialization */
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u8 txretrycount;
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struct sk_buff *currenttxskb;
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/* Locks */
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struct mutex lock;
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spinlock_t driver_lock;
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/* NIC/link operation characteristics */
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u16 mac_control;
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u8 radio_on;
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u8 channel;
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s16 txpower_cur;
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s16 txpower_min;
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s16 txpower_max;
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/** Scanning */
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struct delayed_work scan_work;
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int scan_channel;
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/* remember which channel was scanned last, != 0 if currently scanning */
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u8 scan_ssid[IEEE80211_MAX_SSID_LEN + 1];
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u8 scan_ssid_len;
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/* Associating */
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struct delayed_work assoc_work;
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struct current_bss_params curbssparams;
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u8 mode;
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struct list_head network_list;
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struct list_head network_free_list;
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struct bss_descriptor *networks;
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struct assoc_request * pending_assoc_req;
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struct assoc_request * in_progress_assoc_req;
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u16 capability;
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uint16_t enablehwauto;
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uint16_t ratebitmap;
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/* ADHOC */
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u16 beacon_period;
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u8 beacon_enable;
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u8 adhoccreate;
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/* WEXT */
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char name[DEV_NAME_LEN];
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u8 nodename[16];
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struct iw_statistics wstats;
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u8 cur_rate;
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#define MAX_REGION_CHANNEL_NUM 2
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struct region_channel region_channel[MAX_REGION_CHANNEL_NUM];
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/** Requested Signal Strength*/
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u16 SNR[MAX_TYPE_B][MAX_TYPE_AVG];
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u16 NF[MAX_TYPE_B][MAX_TYPE_AVG];
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u8 RSSI[MAX_TYPE_B][MAX_TYPE_AVG];
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u8 rawSNR[DEFAULT_DATA_AVG_FACTOR];
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u8 rawNF[DEFAULT_DATA_AVG_FACTOR];
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u16 nextSNRNF;
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u16 numSNRNF;
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};
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extern struct cmd_confirm_sleep confirm_sleep;
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#endif
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