v4.19.13 snapshot.
diff --git a/net/mac80211/rate.c b/net/mac80211/rate.c
new file mode 100644
index 0000000..76f303f
--- /dev/null
+++ b/net/mac80211/rate.c
@@ -0,0 +1,995 @@
+/*
+ * Copyright 2002-2005, Instant802 Networks, Inc.
+ * Copyright 2005-2006, Devicescape Software, Inc.
+ * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
+ * Copyright 2017 Intel Deutschland GmbH
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/rtnetlink.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include "rate.h"
+#include "ieee80211_i.h"
+#include "debugfs.h"
+
+struct rate_control_alg {
+ struct list_head list;
+ const struct rate_control_ops *ops;
+};
+
+static LIST_HEAD(rate_ctrl_algs);
+static DEFINE_MUTEX(rate_ctrl_mutex);
+
+static char *ieee80211_default_rc_algo = CONFIG_MAC80211_RC_DEFAULT;
+module_param(ieee80211_default_rc_algo, charp, 0644);
+MODULE_PARM_DESC(ieee80211_default_rc_algo,
+ "Default rate control algorithm for mac80211 to use");
+
+void rate_control_rate_init(struct sta_info *sta)
+{
+ struct ieee80211_local *local = sta->sdata->local;
+ struct rate_control_ref *ref = sta->rate_ctrl;
+ struct ieee80211_sta *ista = &sta->sta;
+ void *priv_sta = sta->rate_ctrl_priv;
+ struct ieee80211_supported_band *sband;
+ struct ieee80211_chanctx_conf *chanctx_conf;
+
+ ieee80211_sta_set_rx_nss(sta);
+
+ if (!ref)
+ return;
+
+ rcu_read_lock();
+
+ chanctx_conf = rcu_dereference(sta->sdata->vif.chanctx_conf);
+ if (WARN_ON(!chanctx_conf)) {
+ rcu_read_unlock();
+ return;
+ }
+
+ sband = local->hw.wiphy->bands[chanctx_conf->def.chan->band];
+
+ spin_lock_bh(&sta->rate_ctrl_lock);
+ ref->ops->rate_init(ref->priv, sband, &chanctx_conf->def, ista,
+ priv_sta);
+ spin_unlock_bh(&sta->rate_ctrl_lock);
+ rcu_read_unlock();
+ set_sta_flag(sta, WLAN_STA_RATE_CONTROL);
+}
+
+void rate_control_tx_status(struct ieee80211_local *local,
+ struct ieee80211_supported_band *sband,
+ struct ieee80211_tx_status *st)
+{
+ struct rate_control_ref *ref = local->rate_ctrl;
+ struct sta_info *sta = container_of(st->sta, struct sta_info, sta);
+ void *priv_sta = sta->rate_ctrl_priv;
+
+ if (!ref || !test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
+ return;
+
+ spin_lock_bh(&sta->rate_ctrl_lock);
+ if (ref->ops->tx_status_ext)
+ ref->ops->tx_status_ext(ref->priv, sband, priv_sta, st);
+ else if (st->skb)
+ ref->ops->tx_status(ref->priv, sband, st->sta, priv_sta, st->skb);
+ else
+ WARN_ON_ONCE(1);
+
+ spin_unlock_bh(&sta->rate_ctrl_lock);
+}
+
+void rate_control_rate_update(struct ieee80211_local *local,
+ struct ieee80211_supported_band *sband,
+ struct sta_info *sta, u32 changed)
+{
+ struct rate_control_ref *ref = local->rate_ctrl;
+ struct ieee80211_sta *ista = &sta->sta;
+ void *priv_sta = sta->rate_ctrl_priv;
+ struct ieee80211_chanctx_conf *chanctx_conf;
+
+ if (ref && ref->ops->rate_update) {
+ rcu_read_lock();
+
+ chanctx_conf = rcu_dereference(sta->sdata->vif.chanctx_conf);
+ if (WARN_ON(!chanctx_conf)) {
+ rcu_read_unlock();
+ return;
+ }
+
+ spin_lock_bh(&sta->rate_ctrl_lock);
+ ref->ops->rate_update(ref->priv, sband, &chanctx_conf->def,
+ ista, priv_sta, changed);
+ spin_unlock_bh(&sta->rate_ctrl_lock);
+ rcu_read_unlock();
+ }
+ drv_sta_rc_update(local, sta->sdata, &sta->sta, changed);
+}
+
+int ieee80211_rate_control_register(const struct rate_control_ops *ops)
+{
+ struct rate_control_alg *alg;
+
+ if (!ops->name)
+ return -EINVAL;
+
+ mutex_lock(&rate_ctrl_mutex);
+ list_for_each_entry(alg, &rate_ctrl_algs, list) {
+ if (!strcmp(alg->ops->name, ops->name)) {
+ /* don't register an algorithm twice */
+ WARN_ON(1);
+ mutex_unlock(&rate_ctrl_mutex);
+ return -EALREADY;
+ }
+ }
+
+ alg = kzalloc(sizeof(*alg), GFP_KERNEL);
+ if (alg == NULL) {
+ mutex_unlock(&rate_ctrl_mutex);
+ return -ENOMEM;
+ }
+ alg->ops = ops;
+
+ list_add_tail(&alg->list, &rate_ctrl_algs);
+ mutex_unlock(&rate_ctrl_mutex);
+
+ return 0;
+}
+EXPORT_SYMBOL(ieee80211_rate_control_register);
+
+void ieee80211_rate_control_unregister(const struct rate_control_ops *ops)
+{
+ struct rate_control_alg *alg;
+
+ mutex_lock(&rate_ctrl_mutex);
+ list_for_each_entry(alg, &rate_ctrl_algs, list) {
+ if (alg->ops == ops) {
+ list_del(&alg->list);
+ kfree(alg);
+ break;
+ }
+ }
+ mutex_unlock(&rate_ctrl_mutex);
+}
+EXPORT_SYMBOL(ieee80211_rate_control_unregister);
+
+static const struct rate_control_ops *
+ieee80211_try_rate_control_ops_get(const char *name)
+{
+ struct rate_control_alg *alg;
+ const struct rate_control_ops *ops = NULL;
+
+ if (!name)
+ return NULL;
+
+ mutex_lock(&rate_ctrl_mutex);
+ list_for_each_entry(alg, &rate_ctrl_algs, list) {
+ if (!strcmp(alg->ops->name, name)) {
+ ops = alg->ops;
+ break;
+ }
+ }
+ mutex_unlock(&rate_ctrl_mutex);
+ return ops;
+}
+
+/* Get the rate control algorithm. */
+static const struct rate_control_ops *
+ieee80211_rate_control_ops_get(const char *name)
+{
+ const struct rate_control_ops *ops;
+ const char *alg_name;
+
+ kernel_param_lock(THIS_MODULE);
+ if (!name)
+ alg_name = ieee80211_default_rc_algo;
+ else
+ alg_name = name;
+
+ ops = ieee80211_try_rate_control_ops_get(alg_name);
+ if (!ops && name)
+ /* try default if specific alg requested but not found */
+ ops = ieee80211_try_rate_control_ops_get(ieee80211_default_rc_algo);
+
+ /* Note: check for > 0 is intentional to avoid clang warning */
+ if (!ops && (strlen(CONFIG_MAC80211_RC_DEFAULT) > 0))
+ /* try built-in one if specific alg requested but not found */
+ ops = ieee80211_try_rate_control_ops_get(CONFIG_MAC80211_RC_DEFAULT);
+
+ kernel_param_unlock(THIS_MODULE);
+
+ return ops;
+}
+
+#ifdef CONFIG_MAC80211_DEBUGFS
+static ssize_t rcname_read(struct file *file, char __user *userbuf,
+ size_t count, loff_t *ppos)
+{
+ struct rate_control_ref *ref = file->private_data;
+ int len = strlen(ref->ops->name);
+
+ return simple_read_from_buffer(userbuf, count, ppos,
+ ref->ops->name, len);
+}
+
+static const struct file_operations rcname_ops = {
+ .read = rcname_read,
+ .open = simple_open,
+ .llseek = default_llseek,
+};
+#endif
+
+static struct rate_control_ref *rate_control_alloc(const char *name,
+ struct ieee80211_local *local)
+{
+ struct dentry *debugfsdir = NULL;
+ struct rate_control_ref *ref;
+
+ ref = kmalloc(sizeof(struct rate_control_ref), GFP_KERNEL);
+ if (!ref)
+ return NULL;
+ ref->ops = ieee80211_rate_control_ops_get(name);
+ if (!ref->ops)
+ goto free;
+
+#ifdef CONFIG_MAC80211_DEBUGFS
+ debugfsdir = debugfs_create_dir("rc", local->hw.wiphy->debugfsdir);
+ local->debugfs.rcdir = debugfsdir;
+ debugfs_create_file("name", 0400, debugfsdir, ref, &rcname_ops);
+#endif
+
+ ref->priv = ref->ops->alloc(&local->hw, debugfsdir);
+ if (!ref->priv)
+ goto free;
+ return ref;
+
+free:
+ kfree(ref);
+ return NULL;
+}
+
+static void rate_control_free(struct ieee80211_local *local,
+ struct rate_control_ref *ctrl_ref)
+{
+ ctrl_ref->ops->free(ctrl_ref->priv);
+
+#ifdef CONFIG_MAC80211_DEBUGFS
+ debugfs_remove_recursive(local->debugfs.rcdir);
+ local->debugfs.rcdir = NULL;
+#endif
+
+ kfree(ctrl_ref);
+}
+
+void ieee80211_check_rate_mask(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_local *local = sdata->local;
+ struct ieee80211_supported_band *sband;
+ u32 user_mask, basic_rates = sdata->vif.bss_conf.basic_rates;
+ enum nl80211_band band;
+
+ if (WARN_ON(!sdata->vif.bss_conf.chandef.chan))
+ return;
+
+ if (WARN_ON_ONCE(!basic_rates))
+ return;
+
+ band = sdata->vif.bss_conf.chandef.chan->band;
+ user_mask = sdata->rc_rateidx_mask[band];
+ sband = local->hw.wiphy->bands[band];
+
+ if (user_mask & basic_rates)
+ return;
+
+ sdata_dbg(sdata,
+ "no overlap between basic rates (0x%x) and user mask (0x%x on band %d) - clearing the latter",
+ basic_rates, user_mask, band);
+ sdata->rc_rateidx_mask[band] = (1 << sband->n_bitrates) - 1;
+}
+
+static bool rc_no_data_or_no_ack_use_min(struct ieee80211_tx_rate_control *txrc)
+{
+ struct sk_buff *skb = txrc->skb;
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+ __le16 fc;
+
+ fc = hdr->frame_control;
+
+ return (info->flags & (IEEE80211_TX_CTL_NO_ACK |
+ IEEE80211_TX_CTL_USE_MINRATE)) ||
+ !ieee80211_is_data(fc);
+}
+
+static void rc_send_low_basicrate(s8 *idx, u32 basic_rates,
+ struct ieee80211_supported_band *sband)
+{
+ u8 i;
+
+ if (basic_rates == 0)
+ return; /* assume basic rates unknown and accept rate */
+ if (*idx < 0)
+ return;
+ if (basic_rates & (1 << *idx))
+ return; /* selected rate is a basic rate */
+
+ for (i = *idx + 1; i <= sband->n_bitrates; i++) {
+ if (basic_rates & (1 << i)) {
+ *idx = i;
+ return;
+ }
+ }
+
+ /* could not find a basic rate; use original selection */
+}
+
+static void __rate_control_send_low(struct ieee80211_hw *hw,
+ struct ieee80211_supported_band *sband,
+ struct ieee80211_sta *sta,
+ struct ieee80211_tx_info *info,
+ u32 rate_mask)
+{
+ int i;
+ u32 rate_flags =
+ ieee80211_chandef_rate_flags(&hw->conf.chandef);
+
+ if ((sband->band == NL80211_BAND_2GHZ) &&
+ (info->flags & IEEE80211_TX_CTL_NO_CCK_RATE))
+ rate_flags |= IEEE80211_RATE_ERP_G;
+
+ info->control.rates[0].idx = 0;
+ for (i = 0; i < sband->n_bitrates; i++) {
+ if (!(rate_mask & BIT(i)))
+ continue;
+
+ if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
+ continue;
+
+ if (!rate_supported(sta, sband->band, i))
+ continue;
+
+ info->control.rates[0].idx = i;
+ break;
+ }
+ WARN_ONCE(i == sband->n_bitrates,
+ "no supported rates (0x%x) in rate_mask 0x%x with flags 0x%x\n",
+ sta ? sta->supp_rates[sband->band] : -1,
+ rate_mask, rate_flags);
+
+ info->control.rates[0].count =
+ (info->flags & IEEE80211_TX_CTL_NO_ACK) ?
+ 1 : hw->max_rate_tries;
+
+ info->control.skip_table = 1;
+}
+
+
+bool rate_control_send_low(struct ieee80211_sta *pubsta,
+ void *priv_sta,
+ struct ieee80211_tx_rate_control *txrc)
+{
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb);
+ struct ieee80211_supported_band *sband = txrc->sband;
+ struct sta_info *sta;
+ int mcast_rate;
+ bool use_basicrate = false;
+
+ if (!pubsta || !priv_sta || rc_no_data_or_no_ack_use_min(txrc)) {
+ __rate_control_send_low(txrc->hw, sband, pubsta, info,
+ txrc->rate_idx_mask);
+
+ if (!pubsta && txrc->bss) {
+ mcast_rate = txrc->bss_conf->mcast_rate[sband->band];
+ if (mcast_rate > 0) {
+ info->control.rates[0].idx = mcast_rate - 1;
+ return true;
+ }
+ use_basicrate = true;
+ } else if (pubsta) {
+ sta = container_of(pubsta, struct sta_info, sta);
+ if (ieee80211_vif_is_mesh(&sta->sdata->vif))
+ use_basicrate = true;
+ }
+
+ if (use_basicrate)
+ rc_send_low_basicrate(&info->control.rates[0].idx,
+ txrc->bss_conf->basic_rates,
+ sband);
+
+ return true;
+ }
+ return false;
+}
+EXPORT_SYMBOL(rate_control_send_low);
+
+static bool rate_idx_match_legacy_mask(s8 *rate_idx, 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 true;
+ }
+ }
+
+ /* 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 true;
+ }
+ }
+ return false;
+}
+
+static bool rate_idx_match_mcs_mask(s8 *rate_idx, u8 *mcs_mask)
+{
+ int i, j;
+ int ridx, rbit;
+
+ ridx = *rate_idx / 8;
+ rbit = *rate_idx % 8;
+
+ /* sanity check */
+ if (ridx < 0 || ridx >= IEEE80211_HT_MCS_MASK_LEN)
+ return false;
+
+ /* See whether the selected rate or anything below it is allowed. */
+ for (i = ridx; i >= 0; i--) {
+ for (j = rbit; j >= 0; j--)
+ if (mcs_mask[i] & BIT(j)) {
+ *rate_idx = i * 8 + j;
+ return true;
+ }
+ rbit = 7;
+ }
+
+ /* Try to find a higher rate that would be allowed */
+ ridx = (*rate_idx + 1) / 8;
+ rbit = (*rate_idx + 1) % 8;
+
+ for (i = ridx; i < IEEE80211_HT_MCS_MASK_LEN; i++) {
+ for (j = rbit; j < 8; j++)
+ if (mcs_mask[i] & BIT(j)) {
+ *rate_idx = i * 8 + j;
+ return true;
+ }
+ rbit = 0;
+ }
+ return false;
+}
+
+static bool rate_idx_match_vht_mcs_mask(s8 *rate_idx, u16 *vht_mask)
+{
+ int i, j;
+ int ridx, rbit;
+
+ ridx = *rate_idx >> 4;
+ rbit = *rate_idx & 0xf;
+
+ if (ridx < 0 || ridx >= NL80211_VHT_NSS_MAX)
+ return false;
+
+ /* See whether the selected rate or anything below it is allowed. */
+ for (i = ridx; i >= 0; i--) {
+ for (j = rbit; j >= 0; j--) {
+ if (vht_mask[i] & BIT(j)) {
+ *rate_idx = (i << 4) | j;
+ return true;
+ }
+ }
+ rbit = 15;
+ }
+
+ /* Try to find a higher rate that would be allowed */
+ ridx = (*rate_idx + 1) >> 4;
+ rbit = (*rate_idx + 1) & 0xf;
+
+ for (i = ridx; i < NL80211_VHT_NSS_MAX; i++) {
+ for (j = rbit; j < 16; j++) {
+ if (vht_mask[i] & BIT(j)) {
+ *rate_idx = (i << 4) | j;
+ return true;
+ }
+ }
+ rbit = 0;
+ }
+ return false;
+}
+
+static void rate_idx_match_mask(s8 *rate_idx, u16 *rate_flags,
+ struct ieee80211_supported_band *sband,
+ enum nl80211_chan_width chan_width,
+ u32 mask,
+ u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN],
+ u16 vht_mask[NL80211_VHT_NSS_MAX])
+{
+ if (*rate_flags & IEEE80211_TX_RC_VHT_MCS) {
+ /* handle VHT rates */
+ if (rate_idx_match_vht_mcs_mask(rate_idx, vht_mask))
+ return;
+
+ *rate_idx = 0;
+ /* keep protection flags */
+ *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS |
+ IEEE80211_TX_RC_USE_CTS_PROTECT |
+ IEEE80211_TX_RC_USE_SHORT_PREAMBLE);
+
+ *rate_flags |= IEEE80211_TX_RC_MCS;
+ if (chan_width == NL80211_CHAN_WIDTH_40)
+ *rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
+
+ if (rate_idx_match_mcs_mask(rate_idx, mcs_mask))
+ return;
+
+ /* also try the legacy rates. */
+ *rate_flags &= ~(IEEE80211_TX_RC_MCS |
+ IEEE80211_TX_RC_40_MHZ_WIDTH);
+ if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates,
+ mask))
+ return;
+ } else if (*rate_flags & IEEE80211_TX_RC_MCS) {
+ /* handle HT rates */
+ if (rate_idx_match_mcs_mask(rate_idx, mcs_mask))
+ return;
+
+ /* also try the legacy rates. */
+ *rate_idx = 0;
+ /* keep protection flags */
+ *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS |
+ IEEE80211_TX_RC_USE_CTS_PROTECT |
+ IEEE80211_TX_RC_USE_SHORT_PREAMBLE);
+ if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates,
+ mask))
+ return;
+ } else {
+ /* handle legacy rates */
+ if (rate_idx_match_legacy_mask(rate_idx, sband->n_bitrates,
+ mask))
+ return;
+
+ /* if HT BSS, and we handle a data frame, also try HT rates */
+ switch (chan_width) {
+ case NL80211_CHAN_WIDTH_20_NOHT:
+ case NL80211_CHAN_WIDTH_5:
+ case NL80211_CHAN_WIDTH_10:
+ return;
+ default:
+ break;
+ }
+
+ *rate_idx = 0;
+ /* keep protection flags */
+ *rate_flags &= (IEEE80211_TX_RC_USE_RTS_CTS |
+ IEEE80211_TX_RC_USE_CTS_PROTECT |
+ IEEE80211_TX_RC_USE_SHORT_PREAMBLE);
+
+ *rate_flags |= IEEE80211_TX_RC_MCS;
+
+ if (chan_width == NL80211_CHAN_WIDTH_40)
+ *rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
+
+ if (rate_idx_match_mcs_mask(rate_idx, mcs_mask))
+ 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.
+ */
+}
+
+static void rate_fixup_ratelist(struct ieee80211_vif *vif,
+ struct ieee80211_supported_band *sband,
+ struct ieee80211_tx_info *info,
+ struct ieee80211_tx_rate *rates,
+ int max_rates)
+{
+ struct ieee80211_rate *rate;
+ bool inval = false;
+ int i;
+
+ /*
+ * Set up the RTS/CTS rate as the fastest basic rate
+ * that is not faster than the data rate unless there
+ * is no basic rate slower than the data rate, in which
+ * case we pick the slowest basic rate
+ *
+ * XXX: Should this check all retry rates?
+ */
+ if (!(rates[0].flags &
+ (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))) {
+ u32 basic_rates = vif->bss_conf.basic_rates;
+ s8 baserate = basic_rates ? ffs(basic_rates) - 1 : 0;
+
+ rate = &sband->bitrates[rates[0].idx];
+
+ for (i = 0; i < sband->n_bitrates; i++) {
+ /* must be a basic rate */
+ if (!(basic_rates & BIT(i)))
+ continue;
+ /* must not be faster than the data rate */
+ if (sband->bitrates[i].bitrate > rate->bitrate)
+ continue;
+ /* maximum */
+ if (sband->bitrates[baserate].bitrate <
+ sband->bitrates[i].bitrate)
+ baserate = i;
+ }
+
+ info->control.rts_cts_rate_idx = baserate;
+ }
+
+ for (i = 0; i < max_rates; i++) {
+ /*
+ * make sure there's no valid rate following
+ * an invalid one, just in case drivers don't
+ * take the API seriously to stop at -1.
+ */
+ if (inval) {
+ rates[i].idx = -1;
+ continue;
+ }
+ if (rates[i].idx < 0) {
+ inval = true;
+ continue;
+ }
+
+ /*
+ * For now assume MCS is already set up correctly, this
+ * needs to be fixed.
+ */
+ if (rates[i].flags & IEEE80211_TX_RC_MCS) {
+ WARN_ON(rates[i].idx > 76);
+
+ if (!(rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) &&
+ info->control.use_cts_prot)
+ rates[i].flags |=
+ IEEE80211_TX_RC_USE_CTS_PROTECT;
+ continue;
+ }
+
+ if (rates[i].flags & IEEE80211_TX_RC_VHT_MCS) {
+ WARN_ON(ieee80211_rate_get_vht_mcs(&rates[i]) > 9);
+ continue;
+ }
+
+ /* set up RTS protection if desired */
+ if (info->control.use_rts) {
+ rates[i].flags |= IEEE80211_TX_RC_USE_RTS_CTS;
+ info->control.use_cts_prot = false;
+ }
+
+ /* RC is busted */
+ if (WARN_ON_ONCE(rates[i].idx >= sband->n_bitrates)) {
+ rates[i].idx = -1;
+ continue;
+ }
+
+ rate = &sband->bitrates[rates[i].idx];
+
+ /* set up short preamble */
+ if (info->control.short_preamble &&
+ rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
+ rates[i].flags |= IEEE80211_TX_RC_USE_SHORT_PREAMBLE;
+
+ /* set up G protection */
+ if (!(rates[i].flags & IEEE80211_TX_RC_USE_RTS_CTS) &&
+ info->control.use_cts_prot &&
+ rate->flags & IEEE80211_RATE_ERP_G)
+ rates[i].flags |= IEEE80211_TX_RC_USE_CTS_PROTECT;
+ }
+}
+
+
+static void rate_control_fill_sta_table(struct ieee80211_sta *sta,
+ struct ieee80211_tx_info *info,
+ struct ieee80211_tx_rate *rates,
+ int max_rates)
+{
+ struct ieee80211_sta_rates *ratetbl = NULL;
+ int i;
+
+ if (sta && !info->control.skip_table)
+ ratetbl = rcu_dereference(sta->rates);
+
+ /* Fill remaining rate slots with data from the sta rate table. */
+ max_rates = min_t(int, max_rates, IEEE80211_TX_RATE_TABLE_SIZE);
+ for (i = 0; i < max_rates; i++) {
+ if (i < ARRAY_SIZE(info->control.rates) &&
+ info->control.rates[i].idx >= 0 &&
+ info->control.rates[i].count) {
+ if (rates != info->control.rates)
+ rates[i] = info->control.rates[i];
+ } else if (ratetbl) {
+ rates[i].idx = ratetbl->rate[i].idx;
+ rates[i].flags = ratetbl->rate[i].flags;
+ if (info->control.use_rts)
+ rates[i].count = ratetbl->rate[i].count_rts;
+ else if (info->control.use_cts_prot)
+ rates[i].count = ratetbl->rate[i].count_cts;
+ else
+ rates[i].count = ratetbl->rate[i].count;
+ } else {
+ rates[i].idx = -1;
+ rates[i].count = 0;
+ }
+
+ if (rates[i].idx < 0 || !rates[i].count)
+ break;
+ }
+}
+
+static bool rate_control_cap_mask(struct ieee80211_sub_if_data *sdata,
+ struct ieee80211_supported_band *sband,
+ struct ieee80211_sta *sta, u32 *mask,
+ u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN],
+ u16 vht_mask[NL80211_VHT_NSS_MAX])
+{
+ u32 i, flags;
+
+ *mask = sdata->rc_rateidx_mask[sband->band];
+ flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
+ for (i = 0; i < sband->n_bitrates; i++) {
+ if ((flags & sband->bitrates[i].flags) != flags)
+ *mask &= ~BIT(i);
+ }
+
+ if (*mask == (1 << sband->n_bitrates) - 1 &&
+ !sdata->rc_has_mcs_mask[sband->band] &&
+ !sdata->rc_has_vht_mcs_mask[sband->band])
+ return false;
+
+ if (sdata->rc_has_mcs_mask[sband->band])
+ memcpy(mcs_mask, sdata->rc_rateidx_mcs_mask[sband->band],
+ IEEE80211_HT_MCS_MASK_LEN);
+ else
+ memset(mcs_mask, 0xff, IEEE80211_HT_MCS_MASK_LEN);
+
+ if (sdata->rc_has_vht_mcs_mask[sband->band])
+ memcpy(vht_mask, sdata->rc_rateidx_vht_mcs_mask[sband->band],
+ sizeof(u16) * NL80211_VHT_NSS_MAX);
+ else
+ memset(vht_mask, 0xff, sizeof(u16) * NL80211_VHT_NSS_MAX);
+
+ if (sta) {
+ __le16 sta_vht_cap;
+ u16 sta_vht_mask[NL80211_VHT_NSS_MAX];
+
+ /* Filter out rates that the STA does not support */
+ *mask &= sta->supp_rates[sband->band];
+ for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++)
+ mcs_mask[i] &= sta->ht_cap.mcs.rx_mask[i];
+
+ sta_vht_cap = sta->vht_cap.vht_mcs.rx_mcs_map;
+ ieee80211_get_vht_mask_from_cap(sta_vht_cap, sta_vht_mask);
+ for (i = 0; i < NL80211_VHT_NSS_MAX; i++)
+ vht_mask[i] &= sta_vht_mask[i];
+ }
+
+ return true;
+}
+
+static void
+rate_control_apply_mask_ratetbl(struct sta_info *sta,
+ struct ieee80211_supported_band *sband,
+ struct ieee80211_sta_rates *rates)
+{
+ int i;
+ u32 mask;
+ u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN];
+ u16 vht_mask[NL80211_VHT_NSS_MAX];
+ enum nl80211_chan_width chan_width;
+
+ if (!rate_control_cap_mask(sta->sdata, sband, &sta->sta, &mask,
+ mcs_mask, vht_mask))
+ return;
+
+ chan_width = sta->sdata->vif.bss_conf.chandef.width;
+ for (i = 0; i < IEEE80211_TX_RATE_TABLE_SIZE; i++) {
+ if (rates->rate[i].idx < 0)
+ break;
+
+ rate_idx_match_mask(&rates->rate[i].idx, &rates->rate[i].flags,
+ sband, chan_width, mask, mcs_mask,
+ vht_mask);
+ }
+}
+
+static void rate_control_apply_mask(struct ieee80211_sub_if_data *sdata,
+ struct ieee80211_sta *sta,
+ struct ieee80211_supported_band *sband,
+ struct ieee80211_tx_rate *rates,
+ int max_rates)
+{
+ enum nl80211_chan_width chan_width;
+ u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN];
+ u32 mask;
+ u16 rate_flags, vht_mask[NL80211_VHT_NSS_MAX];
+ int i;
+
+ /*
+ * 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 (!rate_control_cap_mask(sdata, sband, sta, &mask, mcs_mask,
+ vht_mask))
+ return;
+
+ /*
+ * Make sure the rate index selected for each TX rate is
+ * included in the configured mask and change the rate indexes
+ * if needed.
+ */
+ chan_width = sdata->vif.bss_conf.chandef.width;
+ for (i = 0; i < max_rates; i++) {
+ /* Skip invalid rates */
+ if (rates[i].idx < 0)
+ break;
+
+ rate_flags = rates[i].flags;
+ rate_idx_match_mask(&rates[i].idx, &rate_flags, sband,
+ chan_width, mask, mcs_mask, vht_mask);
+ rates[i].flags = rate_flags;
+ }
+}
+
+void ieee80211_get_tx_rates(struct ieee80211_vif *vif,
+ struct ieee80211_sta *sta,
+ struct sk_buff *skb,
+ struct ieee80211_tx_rate *dest,
+ int max_rates)
+{
+ struct ieee80211_sub_if_data *sdata;
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+ struct ieee80211_supported_band *sband;
+
+ rate_control_fill_sta_table(sta, info, dest, max_rates);
+
+ if (!vif)
+ return;
+
+ sdata = vif_to_sdata(vif);
+ sband = sdata->local->hw.wiphy->bands[info->band];
+
+ if (ieee80211_is_data(hdr->frame_control))
+ rate_control_apply_mask(sdata, sta, sband, dest, max_rates);
+
+ if (dest[0].idx < 0)
+ __rate_control_send_low(&sdata->local->hw, sband, sta, info,
+ sdata->rc_rateidx_mask[info->band]);
+
+ if (sta)
+ rate_fixup_ratelist(vif, sband, info, dest, max_rates);
+}
+EXPORT_SYMBOL(ieee80211_get_tx_rates);
+
+void rate_control_get_rate(struct ieee80211_sub_if_data *sdata,
+ struct sta_info *sta,
+ struct ieee80211_tx_rate_control *txrc)
+{
+ struct rate_control_ref *ref = sdata->local->rate_ctrl;
+ void *priv_sta = NULL;
+ struct ieee80211_sta *ista = NULL;
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb);
+ int i;
+
+ if (sta && test_sta_flag(sta, WLAN_STA_RATE_CONTROL)) {
+ ista = &sta->sta;
+ priv_sta = sta->rate_ctrl_priv;
+ }
+
+ for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
+ info->control.rates[i].idx = -1;
+ info->control.rates[i].flags = 0;
+ info->control.rates[i].count = 0;
+ }
+
+ if (ieee80211_hw_check(&sdata->local->hw, HAS_RATE_CONTROL))
+ return;
+
+ if (ista) {
+ spin_lock_bh(&sta->rate_ctrl_lock);
+ ref->ops->get_rate(ref->priv, ista, priv_sta, txrc);
+ spin_unlock_bh(&sta->rate_ctrl_lock);
+ } else {
+ ref->ops->get_rate(ref->priv, NULL, NULL, txrc);
+ }
+
+ if (ieee80211_hw_check(&sdata->local->hw, SUPPORTS_RC_TABLE))
+ return;
+
+ ieee80211_get_tx_rates(&sdata->vif, ista, txrc->skb,
+ info->control.rates,
+ ARRAY_SIZE(info->control.rates));
+}
+
+int rate_control_set_rates(struct ieee80211_hw *hw,
+ struct ieee80211_sta *pubsta,
+ struct ieee80211_sta_rates *rates)
+{
+ struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
+ struct ieee80211_sta_rates *old;
+ struct ieee80211_supported_band *sband;
+
+ sband = ieee80211_get_sband(sta->sdata);
+ if (!sband)
+ return -EINVAL;
+ rate_control_apply_mask_ratetbl(sta, sband, rates);
+ /*
+ * mac80211 guarantees that this function will not be called
+ * concurrently, so the following RCU access is safe, even without
+ * extra locking. This can not be checked easily, so we just set
+ * the condition to true.
+ */
+ old = rcu_dereference_protected(pubsta->rates, true);
+ rcu_assign_pointer(pubsta->rates, rates);
+ if (old)
+ kfree_rcu(old, rcu_head);
+
+ drv_sta_rate_tbl_update(hw_to_local(hw), sta->sdata, pubsta);
+
+ ieee80211_sta_set_expected_throughput(pubsta, sta_get_expected_throughput(sta));
+
+ return 0;
+}
+EXPORT_SYMBOL(rate_control_set_rates);
+
+int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local,
+ const char *name)
+{
+ struct rate_control_ref *ref;
+
+ ASSERT_RTNL();
+
+ if (local->open_count)
+ return -EBUSY;
+
+ if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
+ if (WARN_ON(!local->ops->set_rts_threshold))
+ return -EINVAL;
+ return 0;
+ }
+
+ ref = rate_control_alloc(name, local);
+ if (!ref) {
+ wiphy_warn(local->hw.wiphy,
+ "Failed to select rate control algorithm\n");
+ return -ENOENT;
+ }
+
+ WARN_ON(local->rate_ctrl);
+ local->rate_ctrl = ref;
+
+ wiphy_debug(local->hw.wiphy, "Selected rate control algorithm '%s'\n",
+ ref->ops->name);
+
+ return 0;
+}
+
+void rate_control_deinitialize(struct ieee80211_local *local)
+{
+ struct rate_control_ref *ref;
+
+ ref = local->rate_ctrl;
+
+ if (!ref)
+ return;
+
+ local->rate_ctrl = NULL;
+ rate_control_free(local, ref);
+}