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linux/drivers/net/wireless/ath/carl9170/carl9170.h
Christian Lamparter e4a668c590 carl9170: fix spurious restart due to high latency 
RX Stress tests of unidirectional bulk traffic with
bitrates of up to 220Mbit/s have revealed that the
fatal-event recovery logic [which was solely triggered
by an out-of-rx-buffer situation] is too aggressive.

The new method now "pings" the device and then
decides - based on the response - whenever
a restart is needed or not.

Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2010-11-15 13:25:32 -05:00

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/*
* Atheros CARL9170 driver
*
* Driver specific definitions
*
* Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
* Copyright 2009, 2010, Christian Lamparter <chunkeey@googlemail.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; see the file COPYING. If not, see
* http://www.gnu.org/licenses/.
*
* This file incorporates work covered by the following copyright and
* permission notice:
* Copyright (c) 2007-2008 Atheros Communications, Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef __CARL9170_H
#define __CARL9170_H
#include <linux/kernel.h>
#include <linux/firmware.h>
#include <linux/completion.h>
#include <linux/spinlock.h>
#include <net/cfg80211.h>
#include <net/mac80211.h>
#include <linux/usb.h>
#ifdef CONFIG_CARL9170_LEDS
#include <linux/leds.h>
#endif /* CONFIG_CARL9170_LEDS */
#ifdef CONFIG_CARL9170_WPC
#include <linux/input.h>
#endif /* CONFIG_CARL9170_WPC */
#include "eeprom.h"
#include "wlan.h"
#include "hw.h"
#include "fwdesc.h"
#include "fwcmd.h"
#include "../regd.h"
#ifdef CONFIG_CARL9170_DEBUGFS
#include "debug.h"
#endif /* CONFIG_CARL9170_DEBUGFS */
#define CARL9170FW_NAME "carl9170-1.fw"
#define PAYLOAD_MAX (CARL9170_MAX_CMD_LEN / 4 - 1)
enum carl9170_rf_init_mode {
CARL9170_RFI_NONE,
CARL9170_RFI_WARM,
CARL9170_RFI_COLD,
};
#define CARL9170_MAX_RX_BUFFER_SIZE 8192
enum carl9170_device_state {
CARL9170_UNKNOWN_STATE,
CARL9170_STOPPED,
CARL9170_IDLE,
CARL9170_STARTED,
};
#define CARL9170_NUM_TID 16
#define WME_BA_BMP_SIZE 64
#define CARL9170_TX_USER_RATE_TRIES 3
#define WME_AC_BE 2
#define WME_AC_BK 3
#define WME_AC_VI 1
#define WME_AC_VO 0
#define TID_TO_WME_AC(_tid) \
((((_tid) == 0) || ((_tid) == 3)) ? WME_AC_BE : \
(((_tid) == 1) || ((_tid) == 2)) ? WME_AC_BK : \
(((_tid) == 4) || ((_tid) == 5)) ? WME_AC_VI : \
WME_AC_VO)
#define SEQ_DIFF(_start, _seq) \
(((_start) - (_seq)) & 0x0fff)
#define SEQ_PREV(_seq) \
(((_seq) - 1) & 0x0fff)
#define SEQ_NEXT(_seq) \
(((_seq) + 1) & 0x0fff)
#define BAW_WITHIN(_start, _bawsz, _seqno) \
((((_seqno) - (_start)) & 0xfff) < (_bawsz))
enum carl9170_tid_state {
CARL9170_TID_STATE_INVALID,
CARL9170_TID_STATE_KILLED,
CARL9170_TID_STATE_SHUTDOWN,
CARL9170_TID_STATE_SUSPEND,
CARL9170_TID_STATE_PROGRESS,
CARL9170_TID_STATE_IDLE,
CARL9170_TID_STATE_XMIT,
};
#define CARL9170_BAW_BITS (2 * WME_BA_BMP_SIZE)
#define CARL9170_BAW_SIZE (BITS_TO_LONGS(CARL9170_BAW_BITS))
#define CARL9170_BAW_LEN (DIV_ROUND_UP(CARL9170_BAW_BITS, BITS_PER_BYTE))
struct carl9170_sta_tid {
/* must be the first entry! */
struct list_head list;
/* temporary list for RCU unlink procedure */
struct list_head tmp_list;
/* lock for the following data structures */
spinlock_t lock;
unsigned int counter;
enum carl9170_tid_state state;
u8 tid; /* TID number ( 0 - 15 ) */
u16 max; /* max. AMPDU size */
u16 snx; /* awaiting _next_ frame */
u16 hsn; /* highest _queued_ sequence */
u16 bsn; /* base of the tx/agg bitmap */
unsigned long bitmap[CARL9170_BAW_SIZE];
/* Preaggregation reorder queue */
struct sk_buff_head queue;
};
#define CARL9170_QUEUE_TIMEOUT 256
#define CARL9170_BUMP_QUEUE 1000
#define CARL9170_TX_TIMEOUT 2500
#define CARL9170_JANITOR_DELAY 128
#define CARL9170_QUEUE_STUCK_TIMEOUT 5500
#define CARL9170_NUM_TX_AGG_MAX 30
/*
* Tradeoff between stability/latency and speed.
*
* AR9170_TXQ_DEPTH is devised by dividing the amount of available
* tx buffers with the size of a full ethernet frame + overhead.
*
* Naturally: The higher the limit, the faster the device CAN send.
* However, even a slight over-commitment at the wrong time and the
* hardware is doomed to send all already-queued frames at suboptimal
* rates. This in turn leads to an enourmous amount of unsuccessful
* retries => Latency goes up, whereas the throughput goes down. CRASH!
*/
#define CARL9170_NUM_TX_LIMIT_HARD ((AR9170_TXQ_DEPTH * 3) / 2)
#define CARL9170_NUM_TX_LIMIT_SOFT (AR9170_TXQ_DEPTH)
struct carl9170_tx_queue_stats {
unsigned int count;
unsigned int limit;
unsigned int len;
};
struct carl9170_vif {
unsigned int id;
struct ieee80211_vif *vif;
};
struct carl9170_vif_info {
struct list_head list;
bool active;
unsigned int id;
struct sk_buff *beacon;
bool enable_beacon;
};
#define AR9170_NUM_RX_URBS 16
#define AR9170_NUM_RX_URBS_MUL 2
#define AR9170_NUM_TX_URBS 8
#define AR9170_NUM_RX_URBS_POOL (AR9170_NUM_RX_URBS_MUL * AR9170_NUM_RX_URBS)
enum carl9170_device_features {
CARL9170_WPS_BUTTON = BIT(0),
CARL9170_ONE_LED = BIT(1),
};
#ifdef CONFIG_CARL9170_LEDS
struct ar9170;
struct carl9170_led {
struct ar9170 *ar;
struct led_classdev l;
char name[32];
unsigned int toggled;
bool last_state;
bool registered;
};
#endif /* CONFIG_CARL9170_LEDS */
enum carl9170_restart_reasons {
CARL9170_RR_NO_REASON = 0,
CARL9170_RR_FATAL_FIRMWARE_ERROR,
CARL9170_RR_TOO_MANY_FIRMWARE_ERRORS,
CARL9170_RR_WATCHDOG,
CARL9170_RR_STUCK_TX,
CARL9170_RR_UNRESPONSIVE_DEVICE,
CARL9170_RR_COMMAND_TIMEOUT,
CARL9170_RR_TOO_MANY_PHY_ERRORS,
CARL9170_RR_LOST_RSP,
CARL9170_RR_INVALID_RSP,
CARL9170_RR_USER_REQUEST,
__CARL9170_RR_LAST,
};
enum carl9170_erp_modes {
CARL9170_ERP_INVALID,
CARL9170_ERP_AUTO,
CARL9170_ERP_MAC80211,
CARL9170_ERP_OFF,
CARL9170_ERP_CTS,
CARL9170_ERP_RTS,
__CARL9170_ERP_NUM,
};
struct ar9170 {
struct ath_common common;
struct ieee80211_hw *hw;
struct mutex mutex;
enum carl9170_device_state state;
spinlock_t state_lock;
enum carl9170_restart_reasons last_reason;
bool registered;
/* USB */
struct usb_device *udev;
struct usb_interface *intf;
struct usb_anchor rx_anch;
struct usb_anchor rx_work;
struct usb_anchor rx_pool;
struct usb_anchor tx_wait;
struct usb_anchor tx_anch;
struct usb_anchor tx_cmd;
struct usb_anchor tx_err;
struct tasklet_struct usb_tasklet;
atomic_t tx_cmd_urbs;
atomic_t tx_anch_urbs;
atomic_t rx_anch_urbs;
atomic_t rx_work_urbs;
atomic_t rx_pool_urbs;
kernel_ulong_t features;
/* firmware settings */
struct completion fw_load_wait;
struct completion fw_boot_wait;
struct {
const struct carl9170fw_desc_head *desc;
const struct firmware *fw;
unsigned int offset;
unsigned int address;
unsigned int cmd_bufs;
unsigned int api_version;
unsigned int vif_num;
unsigned int err_counter;
unsigned int bug_counter;
u32 beacon_addr;
unsigned int beacon_max_len;
bool rx_stream;
bool tx_stream;
bool rx_filter;
unsigned int mem_blocks;
unsigned int mem_block_size;
unsigned int rx_size;
} fw;
/* reset / stuck frames/queue detection */
struct work_struct restart_work;
struct work_struct ping_work;
unsigned int restart_counter;
unsigned long queue_stop_timeout[__AR9170_NUM_TXQ];
unsigned long max_queue_stop_timeout[__AR9170_NUM_TXQ];
bool needs_full_reset;
atomic_t pending_restarts;
/* interface mode settings */
struct list_head vif_list;
unsigned long vif_bitmap;
unsigned int vifs;
struct carl9170_vif vif_priv[AR9170_MAX_VIRTUAL_MAC];
/* beaconing */
spinlock_t beacon_lock;
unsigned int global_pretbtt;
unsigned int global_beacon_int;
struct carl9170_vif_info *beacon_iter;
unsigned int beacon_enabled;
/* cryptographic engine */
u64 usedkeys;
bool rx_software_decryption;
bool disable_offload;
/* filter settings */
u64 cur_mc_hash;
u32 cur_filter;
unsigned int filter_state;
unsigned int rx_filter_caps;
bool sniffer_enabled;
/* MAC */
enum carl9170_erp_modes erp_mode;
/* PHY */
struct ieee80211_channel *channel;
int noise[4];
unsigned int chan_fail;
unsigned int total_chan_fail;
u8 heavy_clip;
u8 ht_settings;
/* power calibration data */
u8 power_5G_leg[4];
u8 power_2G_cck[4];
u8 power_2G_ofdm[4];
u8 power_5G_ht20[8];
u8 power_5G_ht40[8];
u8 power_2G_ht20[8];
u8 power_2G_ht40[8];
#ifdef CONFIG_CARL9170_LEDS
/* LED */
struct delayed_work led_work;
struct carl9170_led leds[AR9170_NUM_LEDS];
#endif /* CONFIG_CARL9170_LEDS */
/* qos queue settings */
spinlock_t tx_stats_lock;
struct carl9170_tx_queue_stats tx_stats[__AR9170_NUM_TXQ];
struct ieee80211_tx_queue_params edcf[5];
struct completion tx_flush;
/* CMD */
int cmd_seq;
int readlen;
u8 *readbuf;
spinlock_t cmd_lock;
struct completion cmd_wait;
union {
__le32 cmd_buf[PAYLOAD_MAX + 1];
struct carl9170_cmd cmd;
struct carl9170_rsp rsp;
};
/* statistics */
unsigned int tx_dropped;
unsigned int tx_ack_failures;
unsigned int tx_fcs_errors;
unsigned int rx_dropped;
/* EEPROM */
struct ar9170_eeprom eeprom;
/* tx queuing */
struct sk_buff_head tx_pending[__AR9170_NUM_TXQ];
struct sk_buff_head tx_status[__AR9170_NUM_TXQ];
struct delayed_work tx_janitor;
unsigned long tx_janitor_last_run;
bool tx_schedule;
/* tx ampdu */
struct work_struct ampdu_work;
spinlock_t tx_ampdu_list_lock;
struct carl9170_sta_tid *tx_ampdu_iter;
struct list_head tx_ampdu_list;
atomic_t tx_ampdu_upload;
atomic_t tx_ampdu_scheduler;
atomic_t tx_total_pending;
atomic_t tx_total_queued;
unsigned int tx_ampdu_list_len;
int current_density;
int current_factor;
bool tx_ampdu_schedule;
/* internal memory management */
spinlock_t mem_lock;
unsigned long *mem_bitmap;
atomic_t mem_free_blocks;
atomic_t mem_allocs;
/* rxstream mpdu merge */
struct ar9170_rx_head rx_plcp;
bool rx_has_plcp;
struct sk_buff *rx_failover;
int rx_failover_missing;
#ifdef CONFIG_CARL9170_WPC
struct {
bool pbc_state;
struct input_dev *pbc;
char name[32];
char phys[32];
} wps;
#endif /* CONFIG_CARL9170_WPC */
#ifdef CONFIG_CARL9170_DEBUGFS
struct carl9170_debug debug;
struct dentry *debug_dir;
#endif /* CONFIG_CARL9170_DEBUGFS */
/* PSM */
struct work_struct ps_work;
struct {
unsigned int dtim_counter;
unsigned long last_beacon;
unsigned long last_action;
unsigned long last_slept;
unsigned int sleep_ms;
unsigned int off_override;
bool state;
} ps;
};
enum carl9170_ps_off_override_reasons {
PS_OFF_VIF = BIT(0),
PS_OFF_BCN = BIT(1),
PS_OFF_5GHZ = BIT(2),
};
struct carl9170_ba_stats {
u8 ampdu_len;
u8 ampdu_ack_len;
bool clear;
};
struct carl9170_sta_info {
bool ht_sta;
unsigned int ampdu_max_len;
struct carl9170_sta_tid *agg[CARL9170_NUM_TID];
struct carl9170_ba_stats stats[CARL9170_NUM_TID];
};
struct carl9170_tx_info {
unsigned long timeout;
struct ar9170 *ar;
struct kref ref;
};
#define CHK_DEV_STATE(a, s) (((struct ar9170 *)a)->state >= (s))
#define IS_INITIALIZED(a) (CHK_DEV_STATE(a, CARL9170_STOPPED))
#define IS_ACCEPTING_CMD(a) (CHK_DEV_STATE(a, CARL9170_IDLE))
#define IS_STARTED(a) (CHK_DEV_STATE(a, CARL9170_STARTED))
static inline void __carl9170_set_state(struct ar9170 *ar,
enum carl9170_device_state newstate)
{
ar->state = newstate;
}
static inline void carl9170_set_state(struct ar9170 *ar,
enum carl9170_device_state newstate)
{
unsigned long flags;
spin_lock_irqsave(&ar->state_lock, flags);
__carl9170_set_state(ar, newstate);
spin_unlock_irqrestore(&ar->state_lock, flags);
}
static inline void carl9170_set_state_when(struct ar9170 *ar,
enum carl9170_device_state min, enum carl9170_device_state newstate)
{
unsigned long flags;
spin_lock_irqsave(&ar->state_lock, flags);
if (CHK_DEV_STATE(ar, min))
__carl9170_set_state(ar, newstate);
spin_unlock_irqrestore(&ar->state_lock, flags);
}
/* exported interface */
void *carl9170_alloc(size_t priv_size);
int carl9170_register(struct ar9170 *ar);
void carl9170_unregister(struct ar9170 *ar);
void carl9170_free(struct ar9170 *ar);
void carl9170_restart(struct ar9170 *ar, const enum carl9170_restart_reasons r);
void carl9170_ps_check(struct ar9170 *ar);
/* USB back-end */
int carl9170_usb_open(struct ar9170 *ar);
void carl9170_usb_stop(struct ar9170 *ar);
void carl9170_usb_tx(struct ar9170 *ar, struct sk_buff *skb);
void carl9170_usb_handle_tx_err(struct ar9170 *ar);
int carl9170_exec_cmd(struct ar9170 *ar, const enum carl9170_cmd_oids,
u32 plen, void *payload, u32 rlen, void *resp);
int __carl9170_exec_cmd(struct ar9170 *ar, struct carl9170_cmd *cmd,
const bool free_buf);
int carl9170_usb_restart(struct ar9170 *ar);
void carl9170_usb_reset(struct ar9170 *ar);
/* MAC */
int carl9170_init_mac(struct ar9170 *ar);
int carl9170_set_qos(struct ar9170 *ar);
int carl9170_update_multicast(struct ar9170 *ar, const u64 mc_hast);
int carl9170_mod_virtual_mac(struct ar9170 *ar, const unsigned int id,
const u8 *mac);
int carl9170_set_operating_mode(struct ar9170 *ar);
int carl9170_set_beacon_timers(struct ar9170 *ar);
int carl9170_set_dyn_sifs_ack(struct ar9170 *ar);
int carl9170_set_rts_cts_rate(struct ar9170 *ar);
int carl9170_set_ampdu_settings(struct ar9170 *ar);
int carl9170_set_slot_time(struct ar9170 *ar);
int carl9170_set_mac_rates(struct ar9170 *ar);
int carl9170_set_hwretry_limit(struct ar9170 *ar, const u32 max_retry);
int carl9170_update_beacon(struct ar9170 *ar, const bool submit);
int carl9170_upload_key(struct ar9170 *ar, const u8 id, const u8 *mac,
const u8 ktype, const u8 keyidx, const u8 *keydata, const int keylen);
int carl9170_disable_key(struct ar9170 *ar, const u8 id);
/* RX */
void carl9170_rx(struct ar9170 *ar, void *buf, unsigned int len);
void carl9170_handle_command_response(struct ar9170 *ar, void *buf, u32 len);
/* TX */
int carl9170_op_tx(struct ieee80211_hw *hw, struct sk_buff *skb);
void carl9170_tx_janitor(struct work_struct *work);
void carl9170_tx_process_status(struct ar9170 *ar,
const struct carl9170_rsp *cmd);
void carl9170_tx_status(struct ar9170 *ar, struct sk_buff *skb,
const bool success);
void carl9170_tx_callback(struct ar9170 *ar, struct sk_buff *skb);
void carl9170_tx_drop(struct ar9170 *ar, struct sk_buff *skb);
void carl9170_tx_scheduler(struct ar9170 *ar);
void carl9170_tx_get_skb(struct sk_buff *skb);
int carl9170_tx_put_skb(struct sk_buff *skb);
/* LEDs */
#ifdef CONFIG_CARL9170_LEDS
int carl9170_led_register(struct ar9170 *ar);
void carl9170_led_unregister(struct ar9170 *ar);
#endif /* CONFIG_CARL9170_LEDS */
int carl9170_led_init(struct ar9170 *ar);
int carl9170_led_set_state(struct ar9170 *ar, const u32 led_state);
/* PHY / RF */
int carl9170_set_channel(struct ar9170 *ar, struct ieee80211_channel *channel,
enum nl80211_channel_type bw, enum carl9170_rf_init_mode rfi);
int carl9170_get_noisefloor(struct ar9170 *ar);
/* FW */
int carl9170_parse_firmware(struct ar9170 *ar);
int carl9170_fw_fix_eeprom(struct ar9170 *ar);
extern struct ieee80211_rate __carl9170_ratetable[];
extern int modparam_noht;
static inline struct ar9170 *carl9170_get_priv(struct carl9170_vif *carl_vif)
{
return container_of(carl_vif, struct ar9170,
vif_priv[carl_vif->id]);
}
static inline struct ieee80211_hdr *carl9170_get_hdr(struct sk_buff *skb)
{
return (void *)((struct _carl9170_tx_superframe *)
skb->data)->frame_data;
}
static inline u16 get_seq_h(struct ieee80211_hdr *hdr)
{
return le16_to_cpu(hdr->seq_ctrl) >> 4;
}
static inline u16 carl9170_get_seq(struct sk_buff *skb)
{
return get_seq_h(carl9170_get_hdr(skb));
}
static inline u16 get_tid_h(struct ieee80211_hdr *hdr)
{
return (ieee80211_get_qos_ctl(hdr))[0] & IEEE80211_QOS_CTL_TID_MASK;
}
static inline u16 carl9170_get_tid(struct sk_buff *skb)
{
return get_tid_h(carl9170_get_hdr(skb));
}
static inline struct ieee80211_vif *
carl9170_get_vif(struct carl9170_vif_info *priv)
{
return container_of((void *)priv, struct ieee80211_vif, drv_priv);
}
/* Protected by ar->mutex or RCU */
static inline struct ieee80211_vif *carl9170_get_main_vif(struct ar9170 *ar)
{
struct carl9170_vif_info *cvif;
list_for_each_entry_rcu(cvif, &ar->vif_list, list) {
if (cvif->active)
return carl9170_get_vif(cvif);
}
return NULL;
}
static inline bool is_main_vif(struct ar9170 *ar, struct ieee80211_vif *vif)
{
bool ret;
rcu_read_lock();
ret = (carl9170_get_main_vif(ar) == vif);
rcu_read_unlock();
return ret;
}
#endif /* __CARL9170_H */
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