--- /dev/null
+From: Felix Fietkau <nbd@nbd.name>
+Date: Mon, 1 Feb 2021 10:47:58 +0100
+Subject: [PATCH] mac80211: minstrel_ht: add debugfs monitoring/controlling
+ API
+
+This allows user space to monitor tx status and take over rate control
+functionality.
+
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+ create mode 100644 net/mac80211/rc80211_minstrel_ht_api.c
+
+--- a/local-symbols
++++ b/local-symbols
+@@ -41,6 +41,7 @@ LIB80211_DEBUG=
+ MAC80211=
+ MAC80211_HAS_RC=
+ MAC80211_RC_MINSTREL=
++MAC80211_RC_MINSTREL_DEBUGFS_API=
+ MAC80211_RC_DEFAULT_MINSTREL=
+ MAC80211_RC_DEFAULT=
+ MAC80211_MESH=
+--- a/net/mac80211/Kconfig
++++ b/net/mac80211/Kconfig
+@@ -29,6 +29,15 @@ config MAC80211_RC_MINSTREL
+ help
+ This option enables the 'minstrel' TX rate control algorithm
+
++config MAC80211_RC_MINSTREL_DEBUGFS_API
++ bool "Minstrel debugfs userspace control API"
++ depends on MAC80211_RC_MINSTREL
++ depends on MAC80211_DEBUGFS
++ select RELAY
++ help
++ This option creates debugfs files that allow user space to observe
++ and/or control minstrel rate selection behavior
++
+ choice
+ prompt "Default rate control algorithm"
+ depends on MAC80211_HAS_RC
+--- a/net/mac80211/Makefile
++++ b/net/mac80211/Makefile
+@@ -61,6 +61,9 @@ rc80211_minstrel-y := \
+ rc80211_minstrel-$(CPTCFG_MAC80211_DEBUGFS) += \
+ rc80211_minstrel_ht_debugfs.o
+
++rc80211_minstrel-$(CPTCFG_MAC80211_RC_MINSTREL_DEBUGFS_API) += \
++ rc80211_minstrel_ht_api.o
++
+ mac80211-$(CPTCFG_MAC80211_RC_MINSTREL) += $(rc80211_minstrel-y)
+
+ ccflags-y += -DDEBUG
+--- a/net/mac80211/rc80211_minstrel_ht.c
++++ b/net/mac80211/rc80211_minstrel_ht.c
+@@ -276,7 +276,8 @@ static const u8 minstrel_sample_seq[] =
+ };
+
+ static void
+-minstrel_ht_update_rates(struct minstrel_priv *mp, struct minstrel_ht_sta *mi);
++minstrel_ht_update_rates(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
++ bool force);
+
+ /*
+ * Some VHT MCSes are invalid (when Ndbps / Nes is not an integer)
+@@ -346,7 +347,7 @@ minstrel_vht_get_group_idx(struct ieee80
+
+ static struct minstrel_rate_stats *
+ minstrel_ht_get_stats(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
+- struct ieee80211_tx_rate *rate)
++ struct ieee80211_tx_rate *rate, u16 *dest_idx)
+ {
+ int group, idx;
+
+@@ -381,6 +382,7 @@ minstrel_ht_get_stats(struct minstrel_pr
+
+ idx = 0;
+ out:
++ *dest_idx = MI_RATE(group, idx);
+ return &mi->groups[group].rates[idx];
+ }
+
+@@ -1020,6 +1022,8 @@ minstrel_ht_update_stats(struct minstrel
+ tp_rate = tmp_legacy_tp_rate;
+
+ for (i = MCS_GROUP_RATES - 1; i >= 0; i--) {
++ bool changed;
++
+ if (!(mi->supported[group] & BIT(i)))
+ continue;
+
+@@ -1027,7 +1031,11 @@ minstrel_ht_update_stats(struct minstrel
+
+ mrs = &mg->rates[i];
+ mrs->retry_updated = false;
++ changed = mrs->attempts > 0;
+ minstrel_ht_calc_rate_stats(mp, mrs);
++ if (changed)
++ minstrel_ht_report_rate_update(mp, mi, index,
++ mrs);
+
+ if (mrs->att_hist)
+ last_prob = max(last_prob, mrs->prob_avg);
+@@ -1076,7 +1084,8 @@ minstrel_ht_update_stats(struct minstrel
+
+ mi->max_prob_rate = tmp_max_prob_rate;
+
+- minstrel_ht_refill_sample_rates(mi);
++ if (!minstrel_ht_manual_mode(mp))
++ minstrel_ht_refill_sample_rates(mi);
+
+ #ifdef CPTCFG_MAC80211_DEBUGFS
+ /* use fixed index if set */
+@@ -1150,6 +1159,7 @@ minstrel_ht_tx_status(void *priv, struct
+ struct minstrel_priv *mp = priv;
+ u32 update_interval = mp->update_interval;
+ bool last, update = false;
++ u16 rate_list[IEEE80211_TX_MAX_RATES] = {};
+ int i;
+
+ /* Ignore packet that was sent with noAck flag */
+@@ -1185,13 +1195,15 @@ minstrel_ht_tx_status(void *priv, struct
+ last = (i == IEEE80211_TX_MAX_RATES - 1) ||
+ !minstrel_ht_txstat_valid(mp, mi, &ar[i + 1]);
+
+- rate = minstrel_ht_get_stats(mp, mi, &ar[i]);
++ rate = minstrel_ht_get_stats(mp, mi, &ar[i], &rate_list[i]);
+ if (last)
+ rate->success += info->status.ampdu_ack_len;
+
+ rate->attempts += ar[i].count * info->status.ampdu_len;
+ }
+
++ minstrel_ht_report_tx_status(mp, mi, info, rate_list, i);
++
+ if (mp->hw->max_rates > 1) {
+ /*
+ * check for sudden death of spatial multiplexing,
+@@ -1213,7 +1225,7 @@ minstrel_ht_tx_status(void *priv, struct
+ }
+
+ if (update)
+- minstrel_ht_update_rates(mp, mi);
++ minstrel_ht_update_rates(mp, mi, false);
+ }
+
+ static void
+@@ -1276,7 +1288,7 @@ minstrel_calc_retransmit(struct minstrel
+ }
+
+
+-static void
++void
+ minstrel_ht_set_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
+ struct ieee80211_sta_rates *ratetbl, int offset, int index)
+ {
+@@ -1385,11 +1397,15 @@ minstrel_ht_get_max_amsdu_len(struct min
+ }
+
+ static void
+-minstrel_ht_update_rates(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
++minstrel_ht_update_rates(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
++ bool force)
+ {
+ struct ieee80211_sta_rates *rates;
+ int i = 0;
+
++ if (minstrel_ht_manual_mode(mp) && !force)
++ return;
++
+ rates = kzalloc(sizeof(*rates), GFP_ATOMIC);
+ if (!rates)
+ return;
+@@ -1416,7 +1432,7 @@ minstrel_ht_get_sample_rate(struct minst
+ {
+ u8 seq;
+
+- if (mp->hw->max_rates > 1) {
++ if (mp->hw->max_rates > 1 && !minstrel_ht_manual_mode(mp)) {
+ seq = mi->sample_seq;
+ mi->sample_seq = (seq + 1) % ARRAY_SIZE(minstrel_sample_seq);
+ seq = minstrel_sample_seq[seq];
+@@ -1662,7 +1678,9 @@ minstrel_ht_update_caps(void *priv, stru
+
+ /* create an initial rate table with the lowest supported rates */
+ minstrel_ht_update_stats(mp, mi);
+- minstrel_ht_update_rates(mp, mi);
++ minstrel_ht_update_rates(mp, mi, true);
++
++ minstrel_ht_sta_update(mp, mi);
+ }
+
+ static void
+@@ -1698,12 +1716,18 @@ minstrel_ht_alloc_sta(void *priv, struct
+ max_rates = sband->n_bitrates;
+ }
+
+- return kzalloc(sizeof(*mi), gfp);
++ mi = kzalloc(sizeof(*mi), gfp);
++#ifdef CPTCFG_MAC80211_RC_MINSTREL_DEBUGFS_API
++ INIT_LIST_HEAD(&mi->list);
++#endif
++
++ return mi;
+ }
+
+ static void
+ minstrel_ht_free_sta(void *priv, struct ieee80211_sta *sta, void *priv_sta)
+ {
++ minstrel_ht_sta_remove(priv, priv_sta);
+ kfree(priv_sta);
+ }
+
+@@ -1814,12 +1838,14 @@ static void minstrel_ht_add_debugfs(stru
+ mp->fixed_rate_idx = (u32) -1;
+ debugfs_create_u32("fixed_rate_idx", S_IRUGO | S_IWUGO, debugfsdir,
+ &mp->fixed_rate_idx);
++ minstrel_ht_add_debugfs_api(hw, priv, debugfsdir);
+ }
+ #endif
+
+ static void
+ minstrel_ht_free(void *priv)
+ {
++ minstrel_ht_remove_debugfs_api(priv);
+ kfree(priv);
+ }
+
+--- a/net/mac80211/rc80211_minstrel_ht.h
++++ b/net/mac80211/rc80211_minstrel_ht.h
+@@ -72,6 +72,10 @@
+ #define MINSTREL_SAMPLE_RATES 5 /* rates per sample type */
+ #define MINSTREL_SAMPLE_INTERVAL (HZ / 50)
+
++#define MINSTREL_MONITOR_STA BIT(0)
++#define MINSTREL_MONITOR_TXS BIT(1)
++#define MINSTREL_MONITOR_STATS BIT(2)
++
+ struct minstrel_priv {
+ struct ieee80211_hw *hw;
+ bool has_mrr;
+@@ -93,6 +97,13 @@ struct minstrel_priv {
+ */
+ u32 fixed_rate_idx;
+ #endif
++#ifdef CPTCFG_MAC80211_RC_MINSTREL_DEBUGFS_API
++ struct rchan *relay_ev;
++ struct list_head stations;
++ spinlock_t lock;
++ u8 monitor;
++ bool manual;
++#endif
+ };
+
+
+@@ -153,6 +164,9 @@ struct minstrel_sample_category {
+ };
+
+ struct minstrel_ht_sta {
++#ifdef CPTCFG_MAC80211_RC_MINSTREL_DEBUGFS_API
++ struct list_head list;
++#endif
+ struct ieee80211_sta *sta;
+
+ /* ampdu length (average, per sampling interval) */
+@@ -197,6 +211,80 @@ struct minstrel_ht_sta {
+ };
+
+ void minstrel_ht_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir);
++
++#ifdef CPTCFG_MAC80211_RC_MINSTREL_DEBUGFS_API
++void minstrel_ht_sta_update(struct minstrel_priv *mp, struct minstrel_ht_sta *mi);
++void minstrel_ht_sta_remove(struct minstrel_priv *mp, struct minstrel_ht_sta *mi);
++void __minstrel_ht_report_tx_status(struct minstrel_priv *mp,
++ struct minstrel_ht_sta *mi,
++ struct ieee80211_tx_info *info,
++ u16 *rate_list, int n_rates);
++void __minstrel_ht_report_rate_update(struct minstrel_priv *mp,
++ struct minstrel_ht_sta *mi, u16 rate,
++ struct minstrel_rate_stats *mrs);
++void minstrel_ht_add_debugfs_api(struct ieee80211_hw *hw, void *priv,
++ struct dentry *dir);
++void minstrel_ht_remove_debugfs_api(void *priv);
++#else
++static inline void
++minstrel_ht_sta_update(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
++{
++}
++static inline void
++minstrel_ht_sta_remove(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
++{
++}
++static inline void
++minstrel_ht_add_debugfs_api(struct ieee80211_hw *hw, void *priv,
++ struct dentry *dir)
++{
++}
++static inline void
++minstrel_ht_remove_debugfs_api(void *priv)
++{
++}
++#endif
++
++static inline void
++minstrel_ht_report_tx_status(struct minstrel_priv *mp,
++ struct minstrel_ht_sta *mi,
++ struct ieee80211_tx_info *info,
++ u16 *rate_list, int n_rates)
++{
++#ifdef CPTCFG_MAC80211_RC_MINSTREL_DEBUGFS_API
++ if (!(mp->monitor & MINSTREL_MONITOR_TXS))
++ return;
++
++ __minstrel_ht_report_tx_status(mp, mi, info, rate_list, n_rates);
++#endif
++}
++
++static inline void
++minstrel_ht_report_rate_update(struct minstrel_priv *mp,
++ struct minstrel_ht_sta *mi, u16 rate,
++ struct minstrel_rate_stats *mrs)
++{
++#ifdef CPTCFG_MAC80211_RC_MINSTREL_DEBUGFS_API
++ if (!(mp->monitor & MINSTREL_MONITOR_STATS))
++ return;
++
++ __minstrel_ht_report_rate_update(mp, mi, rate, mrs);
++#endif
++}
++
++static inline bool
++minstrel_ht_manual_mode(struct minstrel_priv *mp)
++{
++#ifdef CPTCFG_MAC80211_RC_MINSTREL_DEBUGFS_API
++ return mp->manual;
++#else
++ return false;
++#endif
++}
++
++void minstrel_ht_set_rate(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
++ struct ieee80211_sta_rates *ratetbl, int offset,
++ int index);
+ int minstrel_ht_get_tp_avg(struct minstrel_ht_sta *mi, int group, int rate,
+ int prob_avg);
+
+--- /dev/null
++++ b/net/mac80211/rc80211_minstrel_ht_api.c
+@@ -0,0 +1,540 @@
++// SPDX-License-Identifier: GPL-2.0-only
++/*
++ * Copyright (C) 2021 Felix Fietkau <nbd@nbd.name>
++ */
++#include <linux/kernel.h>
++#include <linux/debugfs.h>
++#include <linux/relay.h>
++#include <net/mac80211.h>
++#include "rc80211_minstrel_ht.h"
++
++enum sta_cmd {
++ STA_CMD_PROBE,
++ STA_CMD_RATES,
++};
++
++static void
++minstrel_ht_print_rate_durations(struct seq_file *s, int group)
++{
++ const struct mcs_group *g = &minstrel_mcs_groups[group];
++ int n_rates;
++ int i;
++
++ if (g->flags & IEEE80211_TX_RC_VHT_MCS)
++ n_rates = 10;
++ else
++ n_rates = 8;
++
++ seq_printf(s, "%x", g->duration[0] << g->shift);
++ for (i = 1; i < n_rates; i++)
++ seq_printf(s, ",%x", g->duration[i] << g->shift);
++}
++
++static int
++minstrel_ht_read_api_info(struct seq_file *s, void *data)
++{
++ int i;
++
++ seq_printf(s, "#group;index;offset;type;nss;bw;gi;airtime\n");
++ seq_printf(s, "#sta;action;macaddr;overhead_mcs;overhead_legacy;supported\n");
++ seq_printf(s, "#txs;macaddr;num_frames;num_acked;probe;rates;counts\n");
++ seq_printf(s, "#stats;macaddr;rate;avg_prob;avg_tp;cur_success;cur_attempts;hist_success;hist_attempts\n");
++ seq_printf(s, "#rates;macaddr;rates;counts\n");
++ seq_printf(s, "#probe;macaddr;rate\n");
++ for (i = 0; i < MINSTREL_GROUPS_NB; i++) {
++ const struct mcs_group *g = &minstrel_mcs_groups[i];
++ const char *type;
++
++ if (i == MINSTREL_CCK_GROUP)
++ type = "cck";
++ else if (i == MINSTREL_OFDM_GROUP)
++ type = "ofdm";
++ else if (g->flags & IEEE80211_TX_RC_VHT_MCS)
++ type = "vht";
++ else
++ type = "ht";
++
++ seq_printf(s, "group;%x;%x;%s;%x;%x;%x;",
++ i, (u32) MI_RATE(i, 0), type, g->streams, g->bw,
++ !!(g->flags & IEEE80211_TX_RC_SHORT_GI));
++ minstrel_ht_print_rate_durations(s, i);
++ seq_printf(s, "\n");
++ }
++
++ return 0;
++}
++
++static struct dentry *
++create_buf_file_cb(const char *filename, struct dentry *parent, umode_t mode,
++ struct rchan_buf *buf, int *is_global)
++{
++ struct dentry *f;
++
++ f = debugfs_create_file("api_event", mode, parent, buf,
++ &relay_file_operations);
++ if (IS_ERR(f))
++ return NULL;
++
++ *is_global = 1;
++
++ return f;
++}
++
++static int
++remove_buf_file_cb(struct dentry *f)
++{
++ debugfs_remove(f);
++
++ return 0;
++}
++
++static struct rchan_callbacks relay_ev_cb = {
++ .create_buf_file = create_buf_file_cb,
++ .remove_buf_file = remove_buf_file_cb,
++};
++
++static void
++minstrel_ht_dump_sta(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
++ const char *type)
++{
++ char info[64 + MINSTREL_GROUPS_NB * 4];
++ int ofs = 0;
++ int i;
++
++ ofs += scnprintf(info + ofs, sizeof(info) - ofs, "%llx;sta;%s;%pM;%x;%x;",
++ (unsigned long long)ktime_get_boottime_ns(),
++ type, mi->sta->addr, mi->overhead, mi->overhead_legacy);
++
++ ofs += scnprintf(info + ofs, sizeof(info) - ofs, "%x",
++ mi->supported[0]);
++ for (i = 1; i < MINSTREL_GROUPS_NB; i++)
++ ofs += scnprintf(info + ofs, sizeof(info) - ofs, ",%x",
++ mi->supported[i]);
++
++ ofs += scnprintf(info + ofs, sizeof(info) - ofs, "\n");
++ relay_write(mp->relay_ev, info, ofs);
++ relay_flush(mp->relay_ev);
++}
++
++static void
++__minstrel_ht_dump_stations(struct minstrel_priv *mp, const char *type)
++{
++ struct minstrel_ht_sta *mi;
++
++ list_for_each_entry(mi, &mp->stations, list)
++ minstrel_ht_dump_sta(mp, mi, type);
++}
++
++static void
++minstrel_ht_dump_stations(struct minstrel_priv *mp)
++{
++ spin_lock_bh(&mp->lock);
++ __minstrel_ht_dump_stations(mp, "dump");
++ spin_unlock_bh(&mp->lock);
++}
++
++static void
++minstrel_ht_api_start(struct minstrel_priv *mp, char *params)
++{
++ char *cur;
++ u8 mask = 0;
++
++ spin_lock_bh(&mp->lock);
++
++ while ((cur = strsep(¶ms, ";")) != NULL) {
++ if (!strlen(cur))
++ break;
++
++ if (!strcmp(cur, "txs"))
++ mask |= MINSTREL_MONITOR_TXS;
++ else if (!strcmp(cur, "sta"))
++ mask |= MINSTREL_MONITOR_STA;
++ else if (!strcmp(cur, "stats"))
++ mask |= MINSTREL_MONITOR_STATS;
++ }
++
++ if (!mask)
++ mask = MINSTREL_MONITOR_TXS;
++
++ if (!mp->monitor)
++ __minstrel_ht_dump_stations(mp, "add");
++ mp->monitor = mask | MINSTREL_MONITOR_STA;
++
++ spin_unlock_bh(&mp->lock);
++}
++
++static void
++minstrel_ht_api_stop(struct minstrel_priv *mp)
++{
++ spin_lock_bh(&mp->lock);
++ mp->monitor = 0;
++ relay_reset(mp->relay_ev);
++ spin_unlock_bh(&mp->lock);
++}
++
++static void
++minstrel_ht_reset_sample_table(struct minstrel_ht_sta *mi)
++{
++ memset(mi->sample[MINSTREL_SAMPLE_TYPE_INC].sample_rates, 0,
++ sizeof(mi->sample[MINSTREL_SAMPLE_TYPE_INC].sample_rates));
++}
++
++static void
++minstrel_ht_api_set_manual(struct minstrel_priv *mp, bool manual)
++{
++ struct minstrel_ht_sta *mi;
++
++ mp->manual = manual;
++
++ spin_lock_bh(&mp->lock);
++ list_for_each_entry(mi, &mp->stations, list)
++ minstrel_ht_reset_sample_table(mi);
++ spin_unlock_bh(&mp->lock);
++}
++
++static struct minstrel_ht_sta *
++minstrel_ht_api_get_sta(struct minstrel_priv *mp, const u8 *macaddr)
++{
++ struct minstrel_ht_sta *mi;
++
++ list_for_each_entry(mi, &mp->stations, list) {
++ if (!memcmp(mi->sta->addr, macaddr, ETH_ALEN))
++ return mi;
++ }
++
++ return NULL;
++}
++
++static int
++minstrel_ht_get_args(char **dest, int dest_size, char *str, char *sep)
++{
++ int i, n;
++
++ for (i = 0, n = 0; i < dest_size; i++) {
++ if (!str) {
++ dest[i] = NULL;
++ continue;
++ }
++
++ dest[i] = strsep(&str, sep);
++ if (dest[i])
++ n++;
++ }
++
++ return n;
++}
++
++static bool
++minstrel_ht_valid_rate(struct minstrel_ht_sta *mi, u32 rate)
++{
++ int group, idx;
++
++ group = MI_RATE_GROUP(rate);
++ if (group >= MINSTREL_GROUPS_NB)
++ return false;
++
++ idx = MI_RATE_IDX(rate);
++
++ return !!(mi->supported[group] & BIT(idx));
++}
++
++static int
++minstrel_ht_rate_from_str(struct minstrel_ht_sta *mi, const char *str)
++{
++ unsigned int rate;
++
++ if (kstrtouint(str, 16, &rate))
++ return -EINVAL;
++
++ if (!minstrel_ht_valid_rate(mi, rate))
++ return -EINVAL;
++
++ return rate;
++}
++
++static int
++minstrel_ht_set_probe_rate(struct minstrel_ht_sta *mi, const char *rate_str)
++{
++ u16 *sample_rates;
++ int rate, i;
++
++ if (!rate_str)
++ return -EINVAL;
++
++ rate = minstrel_ht_rate_from_str(mi, rate_str);
++ if (rate < 0)
++ return rate;
++
++ sample_rates = mi->sample[MINSTREL_SAMPLE_TYPE_INC].sample_rates;
++ for (i = 0; i < MINSTREL_SAMPLE_RATES; i++) {
++ if (sample_rates[i])
++ continue;
++
++ sample_rates[i] = rate;
++ mi->sample_time = jiffies;
++ return 0;
++ }
++
++ return -ENOSPC;
++}
++
++static int
++minstrel_ht_set_rates(struct minstrel_priv *mp, struct minstrel_ht_sta *mi,
++ char *rate_str, char *count_str)
++{
++ struct ieee80211_sta_rates *ratetbl;
++ unsigned int count;
++ char *countlist[4];
++ char *ratelist[4];
++ int rate;
++ int n_rates;
++ int n_count;
++ int err = -EINVAL;
++ int i;
++
++ if (!rate_str || !count_str)
++ return -EINVAL;
++
++ ratetbl = kzalloc(sizeof(*ratetbl), GFP_ATOMIC);
++ if (!ratetbl)
++ return -ENOMEM;
++
++ n_rates = minstrel_ht_get_args(ratelist, ARRAY_SIZE(ratelist),
++ rate_str, ",");
++ n_count = minstrel_ht_get_args(countlist, ARRAY_SIZE(countlist),
++ count_str, ",");
++ for (i = 0; i < min(n_rates, n_count); i++) {
++ rate = minstrel_ht_rate_from_str(mi, ratelist[i]);
++ if (rate < 0)
++ goto error;
++
++ if (kstrtouint(countlist[0], 16, &count))
++ goto error;
++
++ minstrel_ht_set_rate(mp, mi, ratetbl, i, rate);
++ ratetbl->rate[i].count = count;
++ ratetbl->rate[i].count_rts = count;
++ ratetbl->rate[i].count_cts = count;
++ }
++
++ rate_control_set_rates(mp->hw, mi->sta, ratetbl);
++
++ return 0;
++
++error:
++ kfree(ratetbl);
++ return err;
++}
++
++static int
++minstrel_ht_api_sta_cmd(struct minstrel_priv *mp, enum sta_cmd cmd,
++ char *arg_str)
++{
++ struct minstrel_ht_sta *mi;
++ uint8_t macaddr[ETH_ALEN];
++ char *args[3];
++ int n_args;
++ int ret = -EINVAL;
++
++ spin_lock_bh(&mp->lock);
++ if (!mp->manual)
++ goto out;
++
++ n_args = minstrel_ht_get_args(args, ARRAY_SIZE(args), arg_str, ";");
++ if (!args[0])
++ goto out;
++
++ if (!mac_pton(args[0], macaddr))
++ goto out;
++
++ mi = minstrel_ht_api_get_sta(mp, macaddr);
++ if (!mi) {
++ ret = -ENOENT;
++ goto out;
++ }
++
++ switch (cmd) {
++ case STA_CMD_PROBE:
++ ret = minstrel_ht_set_probe_rate(mi, args[1]);
++ break;
++ case STA_CMD_RATES:
++ ret = minstrel_ht_set_rates(mp, mi, args[1], args[2]);
++ break;
++ }
++
++out:
++ spin_unlock_bh(&mp->lock);
++
++ return ret;
++}
++
++static ssize_t
++minstrel_ht_control_write(struct file *file, const char __user *userbuf,
++ size_t count, loff_t *ppos)
++{
++ struct minstrel_priv *mp = file->private_data;
++ char *pos, *cur;
++ char buf[64];
++ size_t len = count;
++ int err;
++
++ if (len > sizeof(buf) - 1)
++ return -EINVAL;
++
++ if (copy_from_user(buf, userbuf, len))
++ return -EFAULT;
++
++ if (count > 0 && buf[len - 1] == '\n')
++ len--;
++
++ buf[len] = 0;
++ if (!len)
++ return count;
++
++ pos = buf;
++ cur = strsep(&pos, ";");
++
++ err = 0;
++ if (!strcmp(cur, "dump"))
++ minstrel_ht_dump_stations(mp);
++ else if (!strcmp(cur, "start"))
++ minstrel_ht_api_start(mp, pos);
++ else if (!strcmp(cur, "stop"))
++ minstrel_ht_api_stop(mp);
++ else if (!strcmp(cur, "manual"))
++ minstrel_ht_api_set_manual(mp, true);
++ else if (!strcmp(cur, "auto"))
++ minstrel_ht_api_set_manual(mp, false);
++ else if (!strcmp(cur, "rates"))
++ err = minstrel_ht_api_sta_cmd(mp, STA_CMD_RATES, pos);
++ else if (!strcmp(cur, "probe"))
++ err = minstrel_ht_api_sta_cmd(mp, STA_CMD_PROBE, pos);
++ else
++ err = -EINVAL;
++
++ if (err)
++ return err;
++
++ return count;
++}
++
++static const struct file_operations fops_control = {
++ .open = simple_open,
++ .llseek = generic_file_llseek,
++ .write = minstrel_ht_control_write,
++};
++
++void minstrel_ht_sta_update(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
++{
++ bool add = list_empty(&mi->list);
++
++ spin_lock_bh(&mp->lock);
++ if (add)
++ list_add(&mi->list, &mp->stations);
++ if (mp->monitor)
++ minstrel_ht_dump_sta(mp, mi, add ? "add" : "update");
++ spin_unlock_bh(&mp->lock);
++}
++
++void minstrel_ht_sta_remove(struct minstrel_priv *mp, struct minstrel_ht_sta *mi)
++{
++ char info[64];
++ int ofs = 0;
++
++ spin_lock_bh(&mp->lock);
++ list_del_init(&mi->list);
++
++ if (!mp->monitor)
++ goto out;
++
++ ofs = scnprintf(info, sizeof(info), "%llx;sta;remove;%pM;;;\n",
++ (unsigned long long)ktime_get_boottime_ns(),
++ mi->sta->addr);
++ relay_write(mp->relay_ev, info, ofs);
++ relay_flush(mp->relay_ev);
++
++out:
++ spin_unlock_bh(&mp->lock);
++}
++
++void __minstrel_ht_report_tx_status(struct minstrel_priv *mp,
++ struct minstrel_ht_sta *mi,
++ struct ieee80211_tx_info *info,
++ u16 *rate_list,
++ int n_rates)
++{
++ char txs[64 + IEEE80211_TX_MAX_RATES * 8];
++ int ofs = 0;
++ int i;
++
++ if (!n_rates)
++ return;
++
++ ofs += scnprintf(txs, sizeof(txs), "%llx;txs;%pM;%x;%x;%x;",
++ (unsigned long long)ktime_get_boottime_ns(),
++ mi->sta->addr,
++ info->status.ampdu_len,
++ info->status.ampdu_ack_len,
++ !!(info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE));
++
++ ofs += scnprintf(txs + ofs, sizeof(txs) - ofs, "%x",
++ rate_list[0]);
++ for (i = 1; i < n_rates; i++)
++ ofs += scnprintf(txs + ofs, sizeof(txs) - ofs, ",%x",
++ rate_list[i]);
++
++ ofs += scnprintf(txs + ofs, sizeof(txs) - ofs, ";%x",
++ info->status.rates[0].count);
++ for (i = 1; i < n_rates; i++)
++ ofs += scnprintf(txs + ofs, sizeof(txs) - ofs, ",%x",
++ info->status.rates[i].count);
++ ofs += scnprintf(txs + ofs, sizeof(txs) - ofs, "\n");
++ relay_write(mp->relay_ev, txs, ofs);
++ relay_flush(mp->relay_ev);
++}
++
++void __minstrel_ht_report_rate_update(struct minstrel_priv *mp,
++ struct minstrel_ht_sta *mi, u16 rate,
++ struct minstrel_rate_stats *mrs)
++{
++ char stat[100];
++ int ofs;
++ int tp;
++
++ tp = minstrel_ht_get_tp_avg(mi, MI_RATE_GROUP(rate), MI_RATE_IDX(rate),
++ mrs->prob_avg);
++
++ ofs = scnprintf(stat, sizeof(stat),
++ "%llx;stats;%pM;%x;%x;%x;%x;%x;%x;%x\n",
++ (unsigned long long)ktime_get_boottime_ns(),
++ mi->sta->addr, rate,
++ MINSTREL_TRUNC(mrs->prob_avg * 1000), tp,
++ mrs->last_success,
++ mrs->last_attempts,
++ mrs->succ_hist, mrs->att_hist);
++
++ relay_write(mp->relay_ev, stat, ofs);
++ relay_flush(mp->relay_ev);
++}
++
++void minstrel_ht_add_debugfs_api(struct ieee80211_hw *hw, void *priv,
++ struct dentry *dir)
++{
++ struct minstrel_priv *mp = priv;
++
++ spin_lock_init(&mp->lock);
++ INIT_LIST_HEAD(&mp->stations);
++ mp->relay_ev = relay_open("api_event", dir, 256, 512, &relay_ev_cb,
++ NULL);
++ debugfs_create_devm_seqfile(&hw->wiphy->dev, "api_info",
++ dir, minstrel_ht_read_api_info);
++ debugfs_create_file("api_control", 0200, dir, mp, &fops_control);
++}
++
++void minstrel_ht_remove_debugfs_api(void *priv)
++{
++ struct minstrel_priv *mp = priv;
++
++ if (mp->relay_ev)
++ relay_close(mp->relay_ev);
++}
projects / openwrt / staging / nbd.git / commitdiff