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>
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 976014c..e5dda6f 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -1406,8 +1406,6 @@
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 @@
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,
diff --git a/net/mac80211/debugfs_netdev.c b/net/mac80211/debugfs_netdev.c
index 59f6e3b..1481049 100644
--- a/net/mac80211/debugfs_netdev.c
+++ b/net/mac80211/debugfs_netdev.c
@@ -127,8 +127,10 @@
/* 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 @@
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_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_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_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)
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index a27921e..3e4ac3f 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -494,8 +494,8 @@
*/
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;
diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 264a6c9..fe140bf 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -856,8 +856,12 @@
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);
diff --git a/net/mac80211/rate.c b/net/mac80211/rate.c
index 6349e7f..c74b7c8 100644
--- a/net/mac80211/rate.c
+++ b/net/mac80211/rate.c
@@ -249,6 +249,38 @@
}
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 @@
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 @@
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);
diff --git a/net/mac80211/rate.h b/net/mac80211/rate.h
index cb9bd1f..669dddd 100644
--- a/net/mac80211/rate.h
+++ b/net/mac80211/rate.h
@@ -44,10 +44,7 @@
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);
}
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 4961168..d3a4481 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -519,7 +519,11 @@
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 @@
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);