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cfg80211/mac80211: Use more generic bitrate mask for rate control 

Extend struct cfg80211_bitrate_mask to actually use a bitfield mask
instead of just a single fixed or maximum rate index. This change
itself does not modify the behavior (except for debugfs files), but it
prepares cfg80211 and mac80211 for a new nl80211 command for setting
which rates can be used in TX rate control.

Since frames are now going through the rate control algorithm
unconditionally, the internal IEEE80211_TX_INTFL_RCALGO flag can now
be removed. The RC implementations can use the rate_idx_mask value to
optimize their behavior if only a single rate is enabled.

The old max_rate_idx in struct ieee80211_tx_rate_control is maintained
(but commented as deprecated) for backwards compatibility with existing
RC implementations. Once these implementations have been updated to
use the more generic rate_idx_mask, the max_rate_idx value can be
removed.

Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Jouni Malinen 2010-01-06 13:09:08 +02:00 committed by John W. Linville
parent e00cfce0cb
commit 37eb0b164c
10 changed files with 122 additions and 79 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
include/net/cfg80211.h
View File

@ -857,20 +857,11 @@ enum tx_power_setting {
* cfg80211_bitrate_mask - masks for bitrate control
*/
struct cfg80211_bitrate_mask {
/*
* As discussed in Berlin, this struct really
* should look like this:
struct {
u32 legacy;
u8 mcs[IEEE80211_HT_MCS_MASK_LEN];
/* TODO: add support for masking MCS rates; e.g.: */
/* u8 mcs[IEEE80211_HT_MCS_MASK_LEN]; */
} control[IEEE80211_NUM_BANDS];
* Since we can always fix in-kernel users, let's keep
* it simpler for now:
*/
u32 fixed; /* fixed bitrate, 0 == not fixed */
u32 maxrate; /* in kbps, 0 == no limit */
};
/**
* struct cfg80211_pmksa - PMK Security Association

8
include/net/mac80211.h
View File

@ -255,9 +255,6 @@ struct ieee80211_bss_conf {
* @IEEE80211_TX_CTL_RATE_CTRL_PROBE: internal to mac80211, can be
* set by rate control algorithms to indicate probe rate, will
* be cleared for fragmented frames (except on the last fragment)
* @IEEE80211_TX_INTFL_RCALGO: mac80211 internal flag, do not test or
* set this flag in the driver; indicates that the rate control
* algorithm was used and should be notified of TX status
* @IEEE80211_TX_INTFL_NEED_TXPROCESSING: completely internal to mac80211,
* used to indicate that a pending frame requires TX processing before
* it can be sent out.
@ -287,7 +284,6 @@ enum mac80211_tx_control_flags {
IEEE80211_TX_STAT_AMPDU = BIT(10),
IEEE80211_TX_STAT_AMPDU_NO_BACK = BIT(11),
IEEE80211_TX_CTL_RATE_CTRL_PROBE = BIT(12),
IEEE80211_TX_INTFL_RCALGO = BIT(13),
IEEE80211_TX_INTFL_NEED_TXPROCESSING = BIT(14),
IEEE80211_TX_INTFL_RETRIED = BIT(15),
IEEE80211_TX_INTFL_DONT_ENCRYPT = BIT(16),
@ -2297,6 +2293,9 @@ enum rate_control_changed {
* @short_preamble: whether mac80211 will request short-preamble transmission
* if the selected rate supports it
* @max_rate_idx: user-requested maximum rate (not MCS for now)
* (deprecated; this will be removed once drivers get updated to use
* rate_idx_mask)
* @rate_idx_mask: user-requested rate mask (not MCS for now)
* @skb: the skb that will be transmitted, the control information in it needs
* to be filled in
* @ap: whether this frame is sent out in AP mode
@ -2309,6 +2308,7 @@ struct ieee80211_tx_rate_control {
struct ieee80211_tx_rate reported_rate;
bool rts, short_preamble;
u8 max_rate_idx;
u32 rate_idx_mask;
bool ap;
};

32
net/mac80211/cfg.c
View File

@ -1406,8 +1406,6 @@ static int ieee80211_set_bitrate_mask(struct wiphy *wiphy,
struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
int i;
u32 target_rate;
struct ieee80211_supported_band *sband;
/*
* This _could_ be supported by providing a hook for
@ -1417,35 +1415,11 @@ static int ieee80211_set_bitrate_mask(struct wiphy *wiphy,
if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
return -EOPNOTSUPP;
sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
/*
* target_rate = -1, rate->fixed = 0 means auto only, so use all rates
* target_rate = X, rate->fixed = 1 means only rate X
* target_rate = X, rate->fixed = 0 means all rates <= X
*/
sdata->max_ratectrl_rateidx = -1;
sdata->force_unicast_rateidx = -1;
for (i = 0; i < IEEE80211_NUM_BANDS; i++)
sdata->rc_rateidx_mask[i] = mask->control[i].legacy;
if (mask->fixed)
target_rate = mask->fixed / 100;
else if (mask->maxrate)
target_rate = mask->maxrate / 100;
else
return 0;
for (i = 0; i< sband->n_bitrates; i++) {
if (target_rate != sband->bitrates[i].bitrate)
continue;
/* requested bitrate found */
sdata->max_ratectrl_rateidx = i;
if (mask->fixed)
sdata->force_unicast_rateidx = i;
return 0;
}
return -EINVAL;
return 0;
}
static int ieee80211_remain_on_channel(struct wiphy *wiphy,

22
net/mac80211/debugfs_netdev.c
View File

@ -127,8 +127,10 @@ __IEEE80211_IF_FILE(name, ieee80211_if_write_##name)
/* common attributes */
IEEE80211_IF_FILE(drop_unencrypted, drop_unencrypted, DEC);
IEEE80211_IF_FILE(force_unicast_rateidx, force_unicast_rateidx, DEC);
IEEE80211_IF_FILE(max_ratectrl_rateidx, max_ratectrl_rateidx, DEC);
IEEE80211_IF_FILE(rc_rateidx_mask_2ghz, rc_rateidx_mask[IEEE80211_BAND_2GHZ],
HEX);
IEEE80211_IF_FILE(rc_rateidx_mask_5ghz, rc_rateidx_mask[IEEE80211_BAND_5GHZ],
HEX);
/* STA attributes */
IEEE80211_IF_FILE(bssid, u.mgd.bssid, MAC);
@ -264,8 +266,8 @@ IEEE80211_IF_FILE(dot11MeshHWMPRootMode,
static void add_sta_files(struct ieee80211_sub_if_data *sdata)
{
DEBUGFS_ADD(drop_unencrypted, sta);
DEBUGFS_ADD(force_unicast_rateidx, sta);
DEBUGFS_ADD(max_ratectrl_rateidx, sta);
DEBUGFS_ADD(rc_rateidx_mask_2ghz, sta);
DEBUGFS_ADD(rc_rateidx_mask_5ghz, sta);
DEBUGFS_ADD(bssid, sta);
DEBUGFS_ADD(aid, sta);
@ -275,8 +277,8 @@ static void add_sta_files(struct ieee80211_sub_if_data *sdata)
static void add_ap_files(struct ieee80211_sub_if_data *sdata)
{
DEBUGFS_ADD(drop_unencrypted, ap);
DEBUGFS_ADD(force_unicast_rateidx, ap);
DEBUGFS_ADD(max_ratectrl_rateidx, ap);
DEBUGFS_ADD(rc_rateidx_mask_2ghz, ap);
DEBUGFS_ADD(rc_rateidx_mask_5ghz, ap);
DEBUGFS_ADD(num_sta_ps, ap);
DEBUGFS_ADD(dtim_count, ap);
@ -286,8 +288,8 @@ static void add_ap_files(struct ieee80211_sub_if_data *sdata)
static void add_wds_files(struct ieee80211_sub_if_data *sdata)
{
DEBUGFS_ADD(drop_unencrypted, wds);
DEBUGFS_ADD(force_unicast_rateidx, wds);
DEBUGFS_ADD(max_ratectrl_rateidx, wds);
DEBUGFS_ADD(rc_rateidx_mask_2ghz, wds);
DEBUGFS_ADD(rc_rateidx_mask_5ghz, wds);
DEBUGFS_ADD(peer, wds);
}
@ -295,8 +297,8 @@ static void add_wds_files(struct ieee80211_sub_if_data *sdata)
static void add_vlan_files(struct ieee80211_sub_if_data *sdata)
{
DEBUGFS_ADD(drop_unencrypted, vlan);
DEBUGFS_ADD(force_unicast_rateidx, vlan);
DEBUGFS_ADD(max_ratectrl_rateidx, vlan);
DEBUGFS_ADD(rc_rateidx_mask_2ghz, vlan);
DEBUGFS_ADD(rc_rateidx_mask_5ghz, vlan);
}
static void add_monitor_files(struct ieee80211_sub_if_data *sdata)

4
net/mac80211/ieee80211_i.h
View File

@ -494,8 +494,8 @@ struct ieee80211_sub_if_data {
*/
struct ieee80211_if_ap *bss;
int force_unicast_rateidx; /* forced TX rateidx for unicast frames */
int max_ratectrl_rateidx; /* max TX rateidx for rate control */
/* bitmap of allowed (non-MCS) rate indexes for rate control */
u32 rc_rateidx_mask[IEEE80211_NUM_BANDS];
union {
struct ieee80211_if_ap ap;

8
net/mac80211/iface.c
View File

@ -856,8 +856,12 @@ int ieee80211_if_add(struct ieee80211_local *local, const char *name,
INIT_LIST_HEAD(&sdata->key_list);
sdata->force_unicast_rateidx = -1;
sdata->max_ratectrl_rateidx = -1;
for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
struct ieee80211_supported_band *sband;
sband = local->hw.wiphy->bands[i];
sdata->rc_rateidx_mask[i] =
sband ? (1 << sband->n_bitrates) - 1 : 0;
}
/* setup type-dependent data */
ieee80211_setup_sdata(sdata, type);

63
net/mac80211/rate.c
View File

@ -249,6 +249,38 @@ bool rate_control_send_low(struct ieee80211_sta *sta,
}
EXPORT_SYMBOL(rate_control_send_low);
static void rate_idx_match_mask(struct ieee80211_tx_rate *rate,
int n_bitrates, u32 mask)
{
int j;
/* See whether the selected rate or anything below it is allowed. */
for (j = rate->idx; j >= 0; j--) {
if (mask & (1 << j)) {
/* Okay, found a suitable rate. Use it. */
rate->idx = j;
return;
}
}
/* Try to find a higher rate that would be allowed */
for (j = rate->idx + 1; j < n_bitrates; j++) {
if (mask & (1 << j)) {
/* Okay, found a suitable rate. Use it. */
rate->idx = j;
return;
}
}
/*
* Uh.. No suitable rate exists. This should not really happen with
* sane TX rate mask configurations. However, should someone manage to
* configure supported rates and TX rate mask in incompatible way,
* allow the frame to be transmitted with whatever the rate control
* selected.
*/
}
void rate_control_get_rate(struct ieee80211_sub_if_data *sdata,
struct sta_info *sta,
struct ieee80211_tx_rate_control *txrc)
@ -258,6 +290,7 @@ void rate_control_get_rate(struct ieee80211_sub_if_data *sdata,
struct ieee80211_sta *ista = NULL;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb);
int i;
u32 mask;
if (sta) {
ista = &sta->sta;
@ -270,23 +303,31 @@ void rate_control_get_rate(struct ieee80211_sub_if_data *sdata,
info->control.rates[i].count = 1;
}
if (sta && sdata->force_unicast_rateidx > -1) {
info->control.rates[0].idx = sdata->force_unicast_rateidx;
} else {
ref->ops->get_rate(ref->priv, ista, priv_sta, txrc);
info->flags |= IEEE80211_TX_INTFL_RCALGO;
}
ref->ops->get_rate(ref->priv, ista, priv_sta, txrc);
/*
* try to enforce the maximum rate the user wanted
* Try to enforce the rateidx mask the user wanted. skip this if the
* default mask (allow all rates) is used to save some processing for
* the common case.
*/
if (sdata->max_ratectrl_rateidx > -1)
mask = sdata->rc_rateidx_mask[info->band];
if (mask != (1 << txrc->sband->n_bitrates) - 1) {
if (sta) {
/* Filter out rates that the STA does not support */
mask &= sta->sta.supp_rates[info->band];
}
/*
* Make sure the rate index selected for each TX rate is
* included in the configured mask and change the rate indexes
* if needed.
*/
for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
/* Rate masking supports only legacy rates for now */
if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS)
continue;
info->control.rates[i].idx =
min_t(s8, info->control.rates[i].idx,
sdata->max_ratectrl_rateidx);
rate_idx_match_mask(&info->control.rates[i],
txrc->sband->n_bitrates, mask);
}
}
BUG_ON(info->control.rates[0].idx < 0);

5
net/mac80211/rate.h
View File

@ -44,10 +44,7 @@ static inline void rate_control_tx_status(struct ieee80211_local *local,
struct rate_control_ref *ref = local->rate_ctrl;
struct ieee80211_sta *ista = &sta->sta;
void *priv_sta = sta->rate_ctrl_priv;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
if (likely(info->flags & IEEE80211_TX_INTFL_RCALGO))
ref->ops->tx_status(ref->priv, sband, ista, priv_sta, skb);
ref->ops->tx_status(ref->priv, sband, ista, priv_sta, skb);
}

12
net/mac80211/tx.c
View File

@ -519,7 +519,11 @@ ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
txrc.bss_conf = &tx->sdata->vif.bss_conf;
txrc.skb = tx->skb;
txrc.reported_rate.idx = -1;
txrc.max_rate_idx = tx->sdata->max_ratectrl_rateidx;
txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[tx->channel->band];
if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
txrc.max_rate_idx = -1;
else
txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
txrc.ap = tx->sdata->vif.type == NL80211_IFTYPE_AP;
/* set up RTS protection if desired */
@ -2178,7 +2182,11 @@ struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
txrc.bss_conf = &sdata->vif.bss_conf;
txrc.skb = skb;
txrc.reported_rate.idx = -1;
txrc.max_rate_idx = sdata->max_ratectrl_rateidx;
txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1)
txrc.max_rate_idx = -1;
else
txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1;
txrc.ap = true;
rate_control_get_rate(sdata, NULL, &txrc);

34
net/wireless/wext-compat.c
View File

@ -1204,21 +1204,47 @@ int cfg80211_wext_siwrate(struct net_device *dev,
struct wireless_dev *wdev = dev->ieee80211_ptr;
struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
struct cfg80211_bitrate_mask mask;
u32 fixed, maxrate;
struct ieee80211_supported_band *sband;
int band, ridx;
bool match = false;
if (!rdev->ops->set_bitrate_mask)
return -EOPNOTSUPP;
mask.fixed = 0;
mask.maxrate = 0;
memset(&mask, 0, sizeof(mask));
fixed = 0;
maxrate = 0;
if (rate->value < 0) {
/* nothing */
} else if (rate->fixed) {
mask.fixed = rate->value / 1000; /* kbps */
fixed = rate->value / 100000;
} else {
mask.maxrate = rate->value / 1000; /* kbps */
maxrate = rate->value / 100000;
}
for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
sband = wdev->wiphy->bands[band];
if (sband == NULL)
continue;
for (ridx = 0; ridx < sband->n_bitrates; ridx++) {
struct ieee80211_rate *srate = &sband->bitrates[ridx];
if (fixed == srate->bitrate) {
mask.control[band].legacy = 1 << ridx;
match = true;
break;
}
if (srate->bitrate <= maxrate) {
mask.control[band].legacy |= 1 << ridx;
match = true;
}
}
}
if (!match)
return -EINVAL;
return rdev->ops->set_bitrate_mask(wdev->wiphy, dev, NULL, &mask);
}
EXPORT_SYMBOL_GPL(cfg80211_wext_siwrate);