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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Copyright 2002-2005, Instant802 Networks, Inc.
- * Copyright 2005-2006, Devicescape Software, Inc.
- * Copyright (c) 2006 Jiri Benc <[email protected]>
- * Copyright 2017 Intel Deutschland GmbH
- * Copyright (C) 2022 Intel Corporation
- */
- #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->deflink);
- if (!ref)
- return;
- rcu_read_lock();
- chanctx_conf = rcu_dereference(sta->sdata->vif.bss_conf.chanctx_conf);
- if (WARN_ON(!chanctx_conf)) {
- rcu_read_unlock();
- return;
- }
- sband = local->hw.wiphy->bands[chanctx_conf->def.chan->band];
- /* TODO: check for minstrel_s1g ? */
- if (sband->band == NL80211_BAND_S1GHZ) {
- ieee80211_s1g_sta_rate_init(sta);
- rcu_read_unlock();
- return;
- }
- 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_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;
- struct ieee80211_supported_band *sband;
- if (!ref || !test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
- return;
- sband = local->hw.wiphy->bands[st->info->band];
- 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, unsigned int link_id,
- 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;
- WARN_ON(link_id != 0);
- if (ref && ref->ops->rate_update) {
- rcu_read_lock();
- chanctx_conf = rcu_dereference(sta->sdata->vif.bss_conf.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);
- }
- 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 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;
- ref->priv = ref->ops->alloc(&local->hw);
- 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_link_data *link)
- {
- struct ieee80211_sub_if_data *sdata = link->sdata;
- struct ieee80211_local *local = sdata->local;
- struct ieee80211_supported_band *sband;
- u32 user_mask, basic_rates = link->conf->basic_rates;
- enum nl80211_band band;
- if (WARN_ON(!link->conf->chandef.chan))
- return;
- band = link->conf->chandef.chan->band;
- if (band == NL80211_BAND_S1GHZ) {
- /* TODO */
- return;
- }
- if (WARN_ON_ONCE(!basic_rates))
- return;
- 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_tx_info *info = IEEE80211_SKB_CB(skb);
- return (info->flags & (IEEE80211_TX_CTL_NO_ACK |
- IEEE80211_TX_CTL_USE_MINRATE)) ||
- !ieee80211_is_tx_data(skb);
- }
- static void rc_send_low_basicrate(struct ieee80211_tx_rate *rate,
- u32 basic_rates,
- struct ieee80211_supported_band *sband)
- {
- u8 i;
- if (sband->band == NL80211_BAND_S1GHZ) {
- /* TODO */
- rate->flags |= IEEE80211_TX_RC_S1G_MCS;
- rate->idx = 0;
- return;
- }
- if (basic_rates == 0)
- return; /* assume basic rates unknown and accept rate */
- if (rate->idx < 0)
- return;
- if (basic_rates & (1 << rate->idx))
- return; /* selected rate is a basic rate */
- for (i = rate->idx + 1; i <= sband->n_bitrates; i++) {
- if (basic_rates & (1 << i)) {
- rate->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_S1GHZ) {
- info->control.rates[0].flags |= IEEE80211_TX_RC_S1G_MCS;
- info->control.rates[0].idx = 0;
- return;
- }
- 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 for sta %pM (0x%x, band %d) in rate_mask 0x%x with flags 0x%x\n",
- sta ? sta->addr : NULL,
- sta ? sta->deflink.supp_rates[sband->band] : -1,
- sband->band,
- 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;
- }
- static bool rate_control_send_low(struct ieee80211_sta *pubsta,
- 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 || 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],
- txrc->bss_conf->basic_rates,
- sband);
- return true;
- }
- return false;
- }
- 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->deflink.supp_rates[sband->band];
- for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++)
- mcs_mask[i] &= sta->deflink.ht_cap.mcs.rx_mask[i];
- sta_vht_cap = sta->deflink.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_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_tx_data(skb))
- 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;
- 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 (rate_control_send_low(sta ? &sta->sta : NULL, txrc))
- return;
- if (ieee80211_hw_check(&sdata->local->hw, HAS_RATE_CONTROL))
- return;
- if (sta && test_sta_flag(sta, WLAN_STA_RATE_CONTROL)) {
- ista = &sta->sta;
- priv_sta = sta->rate_ctrl_priv;
- }
- 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 {
- rate_control_send_low(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);
- if (sta->uploaded)
- 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);
- }
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