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mac80211: clean up rate selection

Browse Source 
Move some code out of rc80211_simple since it's probably needed for all rate
selection algorithms, and fix iwlwifi accordingly. While at it, clean up the
rate_control_get_rate() interface.

Signed-off-by: Stefano Brivio <stefano.brivio@polimi.it>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mattias Nissler 2007-12-20 13:50:07 +01:00 committed by David S. Miller
parent 98f0b0a3a4
commit 1abbe498e4
8 changed files with 146 additions and 189 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

44
drivers/net/wireless/iwlwifi/iwl-3945-rs.c
View File

@ -562,22 +562,6 @@ static void rs_tx_status(void *priv_rate,
return;
}
static struct ieee80211_rate *iwl_get_lowest_rate(struct ieee80211_local
*local)
{
struct ieee80211_hw_mode *mode = local->oper_hw_mode;
int i;
for (i = 0; i < mode->num_rates; i++) {
struct ieee80211_rate *rate = &mode->rates[i];
if (rate->flags & IEEE80211_RATE_SUPPORTED)
return rate;
}
return &mode->rates[0];
}
static u16 iwl_get_adjacent_rate(struct iwl_rate_scale_priv *rs_priv,
u8 index, u16 rate_mask, int phymode)
{
@ -656,10 +640,9 @@ static u16 iwl_get_adjacent_rate(struct iwl_rate_scale_priv *rs_priv,
* rate table and must reference the driver allocated rate table
*
*/
static struct ieee80211_rate *rs_get_rate(void *priv_rate,
struct net_device *dev,
struct sk_buff *skb,
struct rate_control_extra *extra)
static void rs_get_rate(void *priv_rate, struct net_device *dev,
struct ieee80211_hw_mode *mode, struct sk_buff *skb,
struct rate_selection *sel)
{
u8 low = IWL_RATE_INVALID;
u8 high = IWL_RATE_INVALID;
@ -676,32 +659,19 @@ static struct ieee80211_rate *rs_get_rate(void *priv_rate,
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
struct sta_info *sta;
u16 fc, rate_mask;
u16 rate_mask;
struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
DECLARE_MAC_BUF(mac);
IWL_DEBUG_RATE("enter\n");
memset(extra, 0, sizeof(*extra));
fc = le16_to_cpu(hdr->frame_control);
if (((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA) ||
(is_multicast_ether_addr(hdr->addr1))) {
/* Send management frames and broadcast/multicast data using
* lowest rate. */
/* TODO: this could probably be improved.. */
IWL_DEBUG_RATE("leave: lowest rate (not data or is "
"multicast)\n");
return iwl_get_lowest_rate(local);
}
sta = sta_info_get(local, hdr->addr1);
if (!sta || !sta->rate_ctrl_priv) {
IWL_DEBUG_RATE("leave: No STA priv data to update!\n");
sel->rate = rate_lowest(local, local->oper_hw_mode, sta);
if (sta)
sta_info_put(sta);
return NULL;
return;
}
rate_mask = sta->supp_rates;
@ -846,7 +816,7 @@ static struct ieee80211_rate *rs_get_rate(void *priv_rate,
IWL_DEBUG_RATE("leave: %d\n", index);
return &priv->ieee_rates[index];
sel->rate = &priv->ieee_rates[index];
}
static struct rate_control_ops rs_ops = {

46
drivers/net/wireless/iwlwifi/iwl-4965-rs.c
View File

@ -1693,55 +1693,27 @@ static void rs_initialize_lq(struct iwl_priv *priv,
return;
}
static struct ieee80211_rate *rs_get_lowest_rate(struct ieee80211_local
*local)
{
struct ieee80211_hw_mode *mode = local->oper_hw_mode;
int i;
for (i = 0; i < mode->num_rates; i++) {
struct ieee80211_rate *rate = &mode->rates[i];
if (rate->flags & IEEE80211_RATE_SUPPORTED)
return rate;
}
return &mode->rates[0];
}
static struct ieee80211_rate *rs_get_rate(void *priv_rate,
struct net_device *dev,
struct sk_buff *skb,
struct rate_control_extra
*extra)
static void rs_get_rate(void *priv_rate, struct net_device *dev,
struct ieee80211_hw_mode *mode, struct sk_buff *skb,
struct rate_selection *sel)
{
int i;
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
struct sta_info *sta;
u16 fc;
struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
struct iwl_rate_scale_priv *lq;
IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
memset(extra, 0, sizeof(*extra));
fc = le16_to_cpu(hdr->frame_control);
if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
/* Send management frames and broadcast/multicast data using
* lowest rate. */
/* TODO: this could probably be improved.. */
return rs_get_lowest_rate(local);
}
sta = sta_info_get(local, hdr->addr1);
if (!sta || !sta->rate_ctrl_priv) {
sel->rate = rate_lowest(local, local->oper_hw_mode, sta);
if (sta)
sta_info_put(sta);
return rs_get_lowest_rate(local);
return;
}
lq = (struct iwl_rate_scale_priv *)sta->rate_ctrl_priv;
@ -1768,11 +1740,13 @@ static struct ieee80211_rate *rs_get_rate(void *priv_rate,
}
done:
if ((i < 0) || (i > IWL_RATE_COUNT)) {
sel->rate = rate_lowest(local, local->oper_hw_mode, sta);
return;
}
sta_info_put(sta);
if ((i < 0) || (i > IWL_RATE_COUNT))
return rs_get_lowest_rate(local);
return &priv->ieee_rates[i];
sel->rate = &priv->ieee_rates[i];
}
static void *rs_alloc_sta(void *priv, gfp_t gfp)

6
net/mac80211/ieee80211.c
View File

@ -859,10 +859,8 @@ void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
sta_info_put(sta);
return;
}
} else {
/* FIXME: STUPID to call this with both local and local->mdev */
rate_control_tx_status(local, local->mdev, skb, status);
}
} else
rate_control_tx_status(local->mdev, skb, status);
ieee80211_led_tx(local, 0);

47
net/mac80211/ieee80211_rate.c
View File

@ -147,6 +147,53 @@ static void rate_control_release(struct kref *kref)
kfree(ctrl_ref);
}
void rate_control_get_rate(struct net_device *dev,
struct ieee80211_hw_mode *mode, struct sk_buff *skb,
struct rate_selection *sel)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct rate_control_ref *ref = local->rate_ctrl;
struct ieee80211_sub_if_data *sdata;
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
struct sta_info *sta = sta_info_get(local, hdr->addr1);
int i;
u16 fc;
memset(sel, 0, sizeof(struct rate_selection));
/* Send management frames and broadcast/multicast data using lowest
* rate. */
fc = le16_to_cpu(hdr->frame_control);
if ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA ||
is_multicast_ether_addr(hdr->addr1))
sel->rate = rate_lowest(local, mode, sta);
/* If a forced rate is in effect, select it. */
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
if (sdata->bss && sdata->bss->force_unicast_rateidx > -1)
sel->rate = &mode->rates[sdata->bss->force_unicast_rateidx];
/* If we haven't found the rate yet, ask the rate control algo. */
if (!sel->rate)
ref->ops->get_rate(ref->priv, dev, mode, skb, sel);
/* Select a non-ERP backup rate. */
if (!sel->nonerp) {
for (i = 0; i < mode->num_rates - 1; i++) {
struct ieee80211_rate *rate = &mode->rates[i];
if (sel->rate->rate < rate->rate)
break;
if (rate_supported(sta, mode, i) &&
!(rate->flags & IEEE80211_RATE_ERP))
sel->nonerp = rate;
}
}
if (sta)
sta_info_put(sta);
}
struct rate_control_ref *rate_control_get(struct rate_control_ref *ref)
{
kref_get(&ref->kref);

73
net/mac80211/ieee80211_rate.h
View File

@ -18,31 +18,24 @@
#include "ieee80211_i.h"
#include "sta_info.h"
#define RATE_CONTROL_NUM_DOWN 20
#define RATE_CONTROL_NUM_UP 15
struct rate_control_extra {
/* values from rate_control_get_rate() to the caller: */
struct ieee80211_rate *probe; /* probe with this rate, or NULL for no
* probing */
struct rate_selection {
/* Selected transmission rate */
struct ieee80211_rate *rate;
/* Non-ERP rate to use if mac80211 decides it cannot use an ERP rate */
struct ieee80211_rate *nonerp;
/* parameters from the caller to rate_control_get_rate(): */
struct ieee80211_hw_mode *mode;
u16 ethertype;
/* probe with this rate, or NULL for no probing */
struct ieee80211_rate *probe;
};
struct rate_control_ops {
struct module *module;
const char *name;
void (*tx_status)(void *priv, struct net_device *dev,
struct sk_buff *skb,
struct ieee80211_tx_status *status);
struct ieee80211_rate *(*get_rate)(void *priv, struct net_device *dev,
struct sk_buff *skb,
struct rate_control_extra *extra);
void (*get_rate)(void *priv, struct net_device *dev,
struct ieee80211_hw_mode *mode, struct sk_buff *skb,
struct rate_selection *sel);
void (*rate_init)(void *priv, void *priv_sta,
struct ieee80211_local *local, struct sta_info *sta);
void (*clear)(void *priv);
@ -75,28 +68,23 @@ void ieee80211_rate_control_unregister(struct rate_control_ops *ops);
* first available algorithm. */
struct rate_control_ref *rate_control_alloc(const char *name,
struct ieee80211_local *local);
void rate_control_get_rate(struct net_device *dev,
struct ieee80211_hw_mode *mode, struct sk_buff *skb,
struct rate_selection *sel);
struct rate_control_ref *rate_control_get(struct rate_control_ref *ref);
void rate_control_put(struct rate_control_ref *ref);
static inline void rate_control_tx_status(struct ieee80211_local *local,
struct net_device *dev,
static inline void rate_control_tx_status(struct net_device *dev,
struct sk_buff *skb,
struct ieee80211_tx_status *status)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct rate_control_ref *ref = local->rate_ctrl;
ref->ops->tx_status(ref->priv, dev, skb, status);
}
static inline struct ieee80211_rate *
rate_control_get_rate(struct ieee80211_local *local, struct net_device *dev,
struct sk_buff *skb, struct rate_control_extra *extra)
{
struct rate_control_ref *ref = local->rate_ctrl;
return ref->ops->get_rate(ref->priv, dev, skb, extra);
}
static inline void rate_control_rate_init(struct sta_info *sta,
struct ieee80211_local *local)
{
@ -142,6 +130,37 @@ static inline void rate_control_remove_sta_debugfs(struct sta_info *sta)
#endif
}
static inline int
rate_supported(struct sta_info *sta, struct ieee80211_hw_mode *mode, int index)
{
return (sta == NULL || sta->supp_rates & BIT(index)) &&
(mode->rates[index].flags & IEEE80211_RATE_SUPPORTED);
}
static inline int
rate_lowest_index(struct ieee80211_local *local, struct ieee80211_hw_mode *mode,
struct sta_info *sta)
{
int i;
for (i = 0; i < mode->num_rates; i++) {
if (rate_supported(sta, mode, i))
return i;
}
/* warn when we cannot find a rate. */
WARN_ON(1);
return 0;
}
static inline struct ieee80211_rate *
rate_lowest(struct ieee80211_local *local, struct ieee80211_hw_mode *mode,
struct sta_info *sta)
{
return &mode->rates[rate_lowest_index(local, mode, sta)];
}
/* functions for rate control related to a device */
int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local,

13
net/mac80211/ieee80211_sta.c
View File

@ -2463,9 +2463,8 @@ static int ieee80211_sta_join_ibss(struct net_device *dev,
struct sk_buff *skb;
struct ieee80211_mgmt *mgmt;
struct ieee80211_tx_control control;
struct ieee80211_rate *rate;
struct ieee80211_hw_mode *mode;
struct rate_control_extra extra;
struct rate_selection ratesel;
u8 *pos;
struct ieee80211_sub_if_data *sdata;
@ -2550,18 +2549,16 @@ static int ieee80211_sta_join_ibss(struct net_device *dev,
}
memset(&control, 0, sizeof(control));
memset(&extra, 0, sizeof(extra));
extra.mode = local->oper_hw_mode;
rate = rate_control_get_rate(local, dev, skb, &extra);
if (!rate) {
rate_control_get_rate(dev, local->oper_hw_mode, skb, &ratesel);
if (!ratesel.rate) {
printk(KERN_DEBUG "%s: Failed to determine TX rate "
"for IBSS beacon\n", dev->name);
break;
}
control.tx_rate =
((sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
(rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
rate->val2 : rate->val;
(ratesel.rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
ratesel.rate->val2 : ratesel.rate->val;
control.antenna_sel_tx = local->hw.conf.antenna_sel_tx;
control.power_level = local->hw.conf.power_level;
control.flags |= IEEE80211_TXCTL_NO_ACK;

64
net/mac80211/rc80211_simple.c
View File

@ -23,6 +23,8 @@
/* This is a minimal implementation of TX rate controlling that can be used
* as the default when no improved mechanisms are available. */
#define RATE_CONTROL_NUM_DOWN 20
#define RATE_CONTROL_NUM_UP 15
#define RATE_CONTROL_EMERG_DEC 2
#define RATE_CONTROL_INTERVAL (HZ / 20)
@ -87,26 +89,6 @@ static void rate_control_rate_dec(struct ieee80211_local *local,
}
}
static struct ieee80211_rate *
rate_control_lowest_rate(struct ieee80211_local *local,
struct ieee80211_hw_mode *mode)
{
int i;
for (i = 0; i < mode->num_rates; i++) {
struct ieee80211_rate *rate = &mode->rates[i];
if (rate->flags & IEEE80211_RATE_SUPPORTED)
return rate;
}
printk(KERN_DEBUG "rate_control_lowest_rate - no supported rates "
"found\n");
return &mode->rates[0];
}
struct global_rate_control {
int dummy;
};
@ -216,56 +198,32 @@ static void rate_control_simple_tx_status(void *priv, struct net_device *dev,
}
static struct ieee80211_rate *
static void
rate_control_simple_get_rate(void *priv, struct net_device *dev,
struct ieee80211_hw_mode *mode,
struct sk_buff *skb,
struct rate_control_extra *extra)
struct rate_selection *sel)
{
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
struct ieee80211_sub_if_data *sdata;
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
struct ieee80211_hw_mode *mode = extra->mode;
struct sta_info *sta;
int rateidx, nonerp_idx;
u16 fc;
memset(extra, 0, sizeof(*extra));
fc = le16_to_cpu(hdr->frame_control);
if ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA ||
(hdr->addr1[0] & 0x01)) {
/* Send management frames and broadcast/multicast data using
* lowest rate. */
/* TODO: this could probably be improved.. */
return rate_control_lowest_rate(local, mode);
}
int rateidx;
sta = sta_info_get(local, hdr->addr1);
if (!sta)
return rate_control_lowest_rate(local, mode);
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
if (sdata->bss && sdata->bss->force_unicast_rateidx > -1)
sta->txrate = sdata->bss->force_unicast_rateidx;
if (!sta) {
sel->rate = rate_lowest(local, mode, NULL);
return;
}
rateidx = sta->txrate;
if (rateidx >= mode->num_rates)
rateidx = mode->num_rates - 1;
sta->last_txrate = rateidx;
nonerp_idx = rateidx;
while (nonerp_idx > 0 &&
((mode->rates[nonerp_idx].flags & IEEE80211_RATE_ERP) ||
!(mode->rates[nonerp_idx].flags & IEEE80211_RATE_SUPPORTED) ||
!(sta->supp_rates & BIT(nonerp_idx))))
nonerp_idx--;
extra->nonerp = &mode->rates[nonerp_idx];
sta_info_put(sta);
return &mode->rates[rateidx];
sel->rate = &mode->rates[rateidx];
}

42
net/mac80211/tx.c
View File

@ -569,21 +569,17 @@ ieee80211_tx_h_encrypt(struct ieee80211_txrx_data *tx)
static ieee80211_txrx_result
ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx)
{
struct rate_control_extra extra;
struct rate_selection rsel;
if (likely(!tx->u.tx.rate)) {
memset(&extra, 0, sizeof(extra));
extra.mode = tx->u.tx.mode;
extra.ethertype = tx->ethertype;
tx->u.tx.rate = rate_control_get_rate(tx->local, tx->dev,
tx->skb, &extra);
if (unlikely(extra.probe != NULL)) {
rate_control_get_rate(tx->dev, tx->u.tx.mode, tx->skb, &rsel);
tx->u.tx.rate = rsel.rate;
if (unlikely(rsel.probe != NULL)) {
tx->u.tx.control->flags |=
IEEE80211_TXCTL_RATE_CTRL_PROBE;
tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
tx->u.tx.control->alt_retry_rate = tx->u.tx.rate->val;
tx->u.tx.rate = extra.probe;
tx->u.tx.rate = rsel.probe;
} else
tx->u.tx.control->alt_retry_rate = -1;
@ -594,14 +590,14 @@ ieee80211_tx_h_rate_ctrl(struct ieee80211_txrx_data *tx)
if (tx->u.tx.mode->mode == MODE_IEEE80211G &&
(tx->sdata->flags & IEEE80211_SDATA_USE_PROTECTION) &&
(tx->flags & IEEE80211_TXRXD_FRAGMENTED) && extra.nonerp) {
(tx->flags & IEEE80211_TXRXD_FRAGMENTED) && rsel.nonerp) {
tx->u.tx.last_frag_rate = tx->u.tx.rate;
if (extra.probe)
if (rsel.probe)
tx->flags &= ~IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
else
tx->flags |= IEEE80211_TXRXD_TXPROBE_LAST_FRAG;
tx->u.tx.rate = extra.nonerp;
tx->u.tx.control->rate = extra.nonerp;
tx->u.tx.rate = rsel.nonerp;
tx->u.tx.control->rate = rsel.nonerp;
tx->u.tx.control->flags &= ~IEEE80211_TXCTL_RATE_CTRL_PROBE;
} else {
tx->u.tx.last_frag_rate = tx->u.tx.rate;
@ -1667,8 +1663,7 @@ struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, int if_id,
struct net_device *bdev;
struct ieee80211_sub_if_data *sdata = NULL;
struct ieee80211_if_ap *ap = NULL;
struct ieee80211_rate *rate;
struct rate_control_extra extra;
struct rate_selection rsel;
u8 *b_head, *b_tail;
int bh_len, bt_len;
@ -1712,14 +1707,13 @@ struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, int if_id,
}
if (control) {
memset(&extra, 0, sizeof(extra));
extra.mode = local->oper_hw_mode;
rate = rate_control_get_rate(local, local->mdev, skb, &extra);
if (!rate) {
rate_control_get_rate(local->mdev, local->oper_hw_mode, skb,
&rsel);
if (!rsel.rate) {
if (net_ratelimit()) {
printk(KERN_DEBUG "%s: ieee80211_beacon_get: no rate "
"found\n", wiphy_name(local->hw.wiphy));
printk(KERN_DEBUG "%s: ieee80211_beacon_get: "
"no rate found\n",
wiphy_name(local->hw.wiphy));
}
dev_kfree_skb(skb);
return NULL;
@ -1727,8 +1721,8 @@ struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw, int if_id,
control->tx_rate =
((sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE) &&
(rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
rate->val2 : rate->val;
(rsel.rate->flags & IEEE80211_RATE_PREAMBLE2)) ?
rsel.rate->val2 : rsel.rate->val;
control->antenna_sel_tx = local->hw.conf.antenna_sel_tx;
control->power_level = local->hw.conf.power_level;
control->flags |= IEEE80211_TXCTL_NO_ACK;