| /* |
| * Copyright 2002-2005, Instant802 Networks, Inc. |
| * Copyright 2005-2006, Devicescape Software, Inc. |
| * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz> |
| * |
| * 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/slab.h> |
| #include <linux/module.h> |
| #include "rate.h" |
| #include "ieee80211_i.h" |
| #include "debugfs.h" |
| |
| struct rate_control_alg { |
| struct list_head list; |
| 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"); |
| |
| int ieee80211_rate_control_register(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(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 struct rate_control_ops * |
| ieee80211_try_rate_control_ops_get(const char *name) |
| { |
| struct rate_control_alg *alg; |
| 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)) |
| if (try_module_get(alg->ops->module)) { |
| ops = alg->ops; |
| break; |
| } |
| } |
| mutex_unlock(&rate_ctrl_mutex); |
| return ops; |
| } |
| |
| /* Get the rate control algorithm. */ |
| static struct rate_control_ops * |
| ieee80211_rate_control_ops_get(const char *name) |
| { |
| struct rate_control_ops *ops; |
| const char *alg_name; |
| |
| kparam_block_sysfs_write(ieee80211_default_rc_algo); |
| if (!name) |
| alg_name = ieee80211_default_rc_algo; |
| else |
| alg_name = name; |
| |
| ops = ieee80211_try_rate_control_ops_get(alg_name); |
| if (!ops) { |
| request_module("rc80211_%s", alg_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); |
| |
| /* try built-in one if specific alg requested but not found */ |
| if (!ops && strlen(CONFIG_MAC80211_RC_DEFAULT)) |
| ops = ieee80211_try_rate_control_ops_get(CONFIG_MAC80211_RC_DEFAULT); |
| kparam_unblock_sysfs_write(ieee80211_default_rc_algo); |
| |
| return ops; |
| } |
| |
| static void ieee80211_rate_control_ops_put(struct rate_control_ops *ops) |
| { |
| module_put(ops->module); |
| } |
| |
| #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) |
| goto fail_ref; |
| ref->local = local; |
| ref->ops = ieee80211_rate_control_ops_get(name); |
| if (!ref->ops) |
| goto fail_ops; |
| |
| #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 fail_priv; |
| return ref; |
| |
| fail_priv: |
| ieee80211_rate_control_ops_put(ref->ops); |
| fail_ops: |
| kfree(ref); |
| fail_ref: |
| return NULL; |
| } |
| |
| static void rate_control_free(struct rate_control_ref *ctrl_ref) |
| { |
| ctrl_ref->ops->free(ctrl_ref->priv); |
| |
| #ifdef CONFIG_MAC80211_DEBUGFS |
| debugfs_remove_recursive(ctrl_ref->local->debugfs.rcdir); |
| ctrl_ref->local->debugfs.rcdir = NULL; |
| #endif |
| |
| ieee80211_rate_control_ops_put(ctrl_ref->ops); |
| kfree(ctrl_ref); |
| } |
| |
| 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_broadcast(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 inline s8 |
| rate_lowest_non_cck_index(struct ieee80211_supported_band *sband, |
| struct ieee80211_sta *sta) |
| { |
| int i; |
| |
| for (i = 0; i < sband->n_bitrates; i++) { |
| struct ieee80211_rate *srate = &sband->bitrates[i]; |
| if ((srate->bitrate == 10) || (srate->bitrate == 20) || |
| (srate->bitrate == 55) || (srate->bitrate == 110)) |
| continue; |
| |
| if (rate_supported(sta, sband->band, i)) |
| return i; |
| } |
| |
| /* No matching rate found */ |
| return 0; |
| } |
| |
| static void __rate_control_send_low(struct ieee80211_hw *hw, |
| struct ieee80211_supported_band *sband, |
| struct ieee80211_sta *sta, |
| struct ieee80211_tx_info *info) |
| { |
| if ((sband->band != IEEE80211_BAND_2GHZ) || |
| !(info->flags & IEEE80211_TX_CTL_NO_CCK_RATE)) |
| info->control.rates[0].idx = rate_lowest_index(sband, sta); |
| else |
| info->control.rates[0].idx = |
| rate_lowest_non_cck_index(sband, sta); |
| |
| 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 *sta, |
| 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; |
| int mcast_rate; |
| |
| if (!sta || !priv_sta || rc_no_data_or_no_ack_use_min(txrc)) { |
| __rate_control_send_low(txrc->hw, sband, sta, info); |
| |
| if (!sta && 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; |
| } |
| |
| rc_send_low_broadcast(&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(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 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(struct ieee80211_tx_rate *rate, |
| u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN]) |
| { |
| 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 void rate_idx_match_mask(struct ieee80211_tx_rate *rate, |
| struct ieee80211_supported_band *sband, |
| enum nl80211_chan_width chan_width, |
| u32 mask, |
| u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN]) |
| { |
| struct ieee80211_tx_rate alt_rate; |
| |
| /* handle HT rates */ |
| if (rate->flags & IEEE80211_TX_RC_MCS) { |
| if (rate_idx_match_mcs_mask(rate, mcs_mask)) |
| return; |
| |
| /* also try the legacy rates. */ |
| alt_rate.idx = 0; |
| /* keep protection flags */ |
| alt_rate.flags = rate->flags & |
| (IEEE80211_TX_RC_USE_RTS_CTS | |
| IEEE80211_TX_RC_USE_CTS_PROTECT | |
| IEEE80211_TX_RC_USE_SHORT_PREAMBLE); |
| alt_rate.count = rate->count; |
| if (rate_idx_match_legacy_mask(&alt_rate, |
| sband->n_bitrates, mask)) { |
| *rate = alt_rate; |
| return; |
| } |
| } else { |
| /* handle legacy rates */ |
| if (rate_idx_match_legacy_mask(rate, sband->n_bitrates, mask)) |
| return; |
| |
| /* if HT BSS, and we handle a data frame, also try HT rates */ |
| if (chan_width == NL80211_CHAN_WIDTH_20_NOHT) |
| return; |
| |
| alt_rate.idx = 0; |
| /* keep protection flags */ |
| alt_rate.flags = rate->flags & |
| (IEEE80211_TX_RC_USE_RTS_CTS | |
| IEEE80211_TX_RC_USE_CTS_PROTECT | |
| IEEE80211_TX_RC_USE_SHORT_PREAMBLE); |
| alt_rate.count = rate->count; |
| |
| alt_rate.flags |= IEEE80211_TX_RC_MCS; |
| |
| if (chan_width == NL80211_CHAN_WIDTH_40) |
| alt_rate.flags |= IEEE80211_TX_RC_40_MHZ_WIDTH; |
| |
| if (rate_idx_match_mcs_mask(&alt_rate, mcs_mask)) { |
| *rate = alt_rate; |
| 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)) { |
| 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 void rate_control_apply_mask(struct ieee80211_sub_if_data *sdata, |
| struct ieee80211_sta *sta, |
| struct ieee80211_supported_band *sband, |
| struct ieee80211_tx_info *info, |
| struct ieee80211_tx_rate *rates, |
| int max_rates) |
| { |
| enum nl80211_chan_width chan_width; |
| u8 mcs_mask[IEEE80211_HT_MCS_MASK_LEN]; |
| bool has_mcs_mask; |
| u32 mask; |
| 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. |
| */ |
| mask = sdata->rc_rateidx_mask[info->band]; |
| has_mcs_mask = sdata->rc_has_mcs_mask[info->band]; |
| if (mask == (1 << sband->n_bitrates) - 1 && !has_mcs_mask) |
| return; |
| |
| if (has_mcs_mask) |
| memcpy(mcs_mask, sdata->rc_rateidx_mcs_mask[info->band], |
| sizeof(mcs_mask)); |
| else |
| memset(mcs_mask, 0xff, sizeof(mcs_mask)); |
| |
| if (sta) { |
| /* Filter out rates that the STA does not support */ |
| mask &= sta->supp_rates[info->band]; |
| for (i = 0; i < sizeof(mcs_mask); i++) |
| mcs_mask[i] &= sta->ht_cap.mcs.rx_mask[i]; |
| } |
| |
| /* |
| * 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_idx_match_mask(&rates[i], sband, mask, chan_width, |
| mcs_mask); |
| } |
| } |
| |
| 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, info, dest, max_rates); |
| |
| if (dest[0].idx < 0) |
| __rate_control_send_low(&sdata->local->hw, sband, sta, info); |
| |
| 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 (sdata->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) |
| return; |
| |
| ref->ops->get_rate(ref->priv, ista, priv_sta, txrc); |
| |
| if (sdata->local->hw.flags & IEEE80211_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 ieee80211_sta_rates *old = rcu_dereference(pubsta->rates); |
| |
| rcu_assign_pointer(pubsta->rates, rates); |
| if (old) |
| kfree_rcu(old, rcu_head); |
| |
| 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 (local->hw.flags & IEEE80211_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(ref); |
| } |
| |