• J
    mac80211: Implement mesh synchronization framework · dbf498fb
    Javier Cardona 提交于
    This patch adds MBSS extensible synchronization framework (Sec.
    13.13.2 of IEEE Std. 802.11-2012).
    
    The framework is implemented via an ops table which defines the
    following functions:
    
        rx_bcn_presp() - this is called every time a mesh beacon is
    received.
        adjust_tbtt() - this is called immediately before a beacon is about
    to be transmitted.
    
    The default neighbor offset synchronization defined in the standard is
    implemented.  We also provide template functions for vendor specific
    methods.
    
    When neighbor offset synchronization is active (which is the default)
    mesh neighbors in the same MBSS will track timing offsets to each other
    and compensate clock drift.
    
    In our tests we observed that this mesh synchronization implementation
    successfully corrected drifts between stations of ~2PPM while
    introducing a jitter of ~20us.
    
    It is also possible to test this framework on mac80211_hwsim simulated
    phys to see how it behaves under different topologies, over poor links,
    etc.
    Signed-off-by: NMarco Porsch <marco.porsch@s2005.tu-chemnitz.de>
    Signed-off-by: NPavel Zubarev <pavel.zubarev@gmail.com>
    Signed-off-by: NJavier Cardona <javier@cozybit.com>
    Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
    dbf498fb
debugfs_sta.c 11.7 KB
/*
 * Copyright 2003-2005	Devicescape Software, Inc.
 * Copyright (c) 2006	Jiri Benc <jbenc@suse.cz>
 * Copyright 2007	Johannes Berg <johannes@sipsolutions.net>
 *
 * 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/debugfs.h>
#include <linux/ieee80211.h>
#include "ieee80211_i.h"
#include "debugfs.h"
#include "debugfs_sta.h"
#include "sta_info.h"

/* sta attributtes */

#define STA_READ(name, field, format_string)				\
static ssize_t sta_ ##name## _read(struct file *file,			\
				   char __user *userbuf,		\
				   size_t count, loff_t *ppos)		\
{									\
	struct sta_info *sta = file->private_data;			\
	return mac80211_format_buffer(userbuf, count, ppos, 		\
				      format_string, sta->field);	\
}
#define STA_READ_D(name, field) STA_READ(name, field, "%d\n")
#define STA_READ_U(name, field) STA_READ(name, field, "%u\n")
#define STA_READ_S(name, field) STA_READ(name, field, "%s\n")

#define STA_OPS(name)							\
static const struct file_operations sta_ ##name## _ops = {		\
	.read = sta_##name##_read,					\
	.open = mac80211_open_file_generic,				\
	.llseek = generic_file_llseek,					\
}

#define STA_OPS_RW(name)						\
static const struct file_operations sta_ ##name## _ops = {		\
	.read = sta_##name##_read,					\
	.write = sta_##name##_write,					\
	.open = mac80211_open_file_generic,				\
	.llseek = generic_file_llseek,					\
}

#define STA_FILE(name, field, format)					\
		STA_READ_##format(name, field)				\
		STA_OPS(name)

STA_FILE(aid, sta.aid, D);
STA_FILE(dev, sdata->name, S);
STA_FILE(last_signal, last_signal, D);

static ssize_t sta_flags_read(struct file *file, char __user *userbuf,
			      size_t count, loff_t *ppos)
{
	char buf[121];
	struct sta_info *sta = file->private_data;

#define TEST(flg) \
	test_sta_flag(sta, WLAN_STA_##flg) ? #flg "\n" : ""

	int res = scnprintf(buf, sizeof(buf),
			    "%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
			    TEST(AUTH), TEST(ASSOC), TEST(PS_STA),
			    TEST(PS_DRIVER), TEST(AUTHORIZED),
			    TEST(SHORT_PREAMBLE),
			    TEST(WME), TEST(WDS), TEST(CLEAR_PS_FILT),
			    TEST(MFP), TEST(BLOCK_BA), TEST(PSPOLL),
			    TEST(UAPSD), TEST(SP), TEST(TDLS_PEER),
			    TEST(TDLS_PEER_AUTH), TEST(4ADDR_EVENT),
			    TEST(INSERTED), TEST(RATE_CONTROL),
			    TEST(TOFFSET_KNOWN));
#undef TEST
	return simple_read_from_buffer(userbuf, count, ppos, buf, res);
}
STA_OPS(flags);

static ssize_t sta_num_ps_buf_frames_read(struct file *file,
					  char __user *userbuf,
					  size_t count, loff_t *ppos)
{
	struct sta_info *sta = file->private_data;
	char buf[17*IEEE80211_NUM_ACS], *p = buf;
	int ac;

	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
		p += scnprintf(p, sizeof(buf)+buf-p, "AC%d: %d\n", ac,
			       skb_queue_len(&sta->ps_tx_buf[ac]) +
			       skb_queue_len(&sta->tx_filtered[ac]));
	return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
}
STA_OPS(num_ps_buf_frames);

static ssize_t sta_inactive_ms_read(struct file *file, char __user *userbuf,
				    size_t count, loff_t *ppos)
{
	struct sta_info *sta = file->private_data;
	return mac80211_format_buffer(userbuf, count, ppos, "%d\n",
				      jiffies_to_msecs(jiffies - sta->last_rx));
}
STA_OPS(inactive_ms);


static ssize_t sta_connected_time_read(struct file *file, char __user *userbuf,
					size_t count, loff_t *ppos)
{
	struct sta_info *sta = file->private_data;
	struct timespec uptime;
	struct tm result;
	long connected_time_secs;
	char buf[100];
	int res;
	do_posix_clock_monotonic_gettime(&uptime);
	connected_time_secs = uptime.tv_sec - sta->last_connected;
	time_to_tm(connected_time_secs, 0, &result);
	result.tm_year -= 70;
	result.tm_mday -= 1;
	res = scnprintf(buf, sizeof(buf),
		"years  - %ld\nmonths - %d\ndays   - %d\nclock  - %d:%d:%d\n\n",
			result.tm_year, result.tm_mon, result.tm_mday,
			result.tm_hour, result.tm_min, result.tm_sec);
	return simple_read_from_buffer(userbuf, count, ppos, buf, res);
}
STA_OPS(connected_time);



static ssize_t sta_last_seq_ctrl_read(struct file *file, char __user *userbuf,
				      size_t count, loff_t *ppos)
{
	char buf[15*NUM_RX_DATA_QUEUES], *p = buf;
	int i;
	struct sta_info *sta = file->private_data;
	for (i = 0; i < NUM_RX_DATA_QUEUES; i++)
		p += scnprintf(p, sizeof(buf)+buf-p, "%x ",
			       le16_to_cpu(sta->last_seq_ctrl[i]));
	p += scnprintf(p, sizeof(buf)+buf-p, "\n");
	return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
}
STA_OPS(last_seq_ctrl);

static ssize_t sta_agg_status_read(struct file *file, char __user *userbuf,
					size_t count, loff_t *ppos)
{
	char buf[71 + STA_TID_NUM * 40], *p = buf;
	int i;
	struct sta_info *sta = file->private_data;
	struct tid_ampdu_rx *tid_rx;
	struct tid_ampdu_tx *tid_tx;

	rcu_read_lock();

	p += scnprintf(p, sizeof(buf) + buf - p, "next dialog_token: %#02x\n",
			sta->ampdu_mlme.dialog_token_allocator + 1);
	p += scnprintf(p, sizeof(buf) + buf - p,
		       "TID\t\tRX active\tDTKN\tSSN\t\tTX\tDTKN\tpending\n");

	for (i = 0; i < STA_TID_NUM; i++) {
		tid_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[i]);
		tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[i]);

		p += scnprintf(p, sizeof(buf) + buf - p, "%02d", i);
		p += scnprintf(p, sizeof(buf) + buf - p, "\t\t%x", !!tid_rx);
		p += scnprintf(p, sizeof(buf) + buf - p, "\t%#.2x",
				tid_rx ? tid_rx->dialog_token : 0);
		p += scnprintf(p, sizeof(buf) + buf - p, "\t%#.3x",
				tid_rx ? tid_rx->ssn : 0);

		p += scnprintf(p, sizeof(buf) + buf - p, "\t\t%x", !!tid_tx);
		p += scnprintf(p, sizeof(buf) + buf - p, "\t%#.2x",
				tid_tx ? tid_tx->dialog_token : 0);
		p += scnprintf(p, sizeof(buf) + buf - p, "\t%03d",
				tid_tx ? skb_queue_len(&tid_tx->pending) : 0);
		p += scnprintf(p, sizeof(buf) + buf - p, "\n");
	}
	rcu_read_unlock();

	return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
}

static ssize_t sta_agg_status_write(struct file *file, const char __user *userbuf,
				    size_t count, loff_t *ppos)
{
	char _buf[12], *buf = _buf;
	struct sta_info *sta = file->private_data;
	bool start, tx;
	unsigned long tid;
	int ret;

	if (count > sizeof(_buf))
		return -EINVAL;

	if (copy_from_user(buf, userbuf, count))
		return -EFAULT;

	buf[sizeof(_buf) - 1] = '\0';

	if (strncmp(buf, "tx ", 3) == 0) {
		buf += 3;
		tx = true;
	} else if (strncmp(buf, "rx ", 3) == 0) {
		buf += 3;
		tx = false;
	} else
		return -EINVAL;

	if (strncmp(buf, "start ", 6) == 0) {
		buf += 6;
		start = true;
		if (!tx)
			return -EINVAL;
	} else if (strncmp(buf, "stop ", 5) == 0) {
		buf += 5;
		start = false;
	} else
		return -EINVAL;

	tid = simple_strtoul(buf, NULL, 0);

	if (tid >= STA_TID_NUM)
		return -EINVAL;

	if (tx) {
		if (start)
			ret = ieee80211_start_tx_ba_session(&sta->sta, tid, 5000);
		else
			ret = ieee80211_stop_tx_ba_session(&sta->sta, tid);
	} else {
		__ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_RECIPIENT,
					       3, true);
		ret = 0;
	}

	return ret ?: count;
}
STA_OPS_RW(agg_status);

static ssize_t sta_ht_capa_read(struct file *file, char __user *userbuf,
				size_t count, loff_t *ppos)
{
#define PRINT_HT_CAP(_cond, _str) \
	do { \
	if (_cond) \
			p += scnprintf(p, sizeof(buf)+buf-p, "\t" _str "\n"); \
	} while (0)
	char buf[512], *p = buf;
	int i;
	struct sta_info *sta = file->private_data;
	struct ieee80211_sta_ht_cap *htc = &sta->sta.ht_cap;

	p += scnprintf(p, sizeof(buf) + buf - p, "ht %ssupported\n",
			htc->ht_supported ? "" : "not ");
	if (htc->ht_supported) {
		p += scnprintf(p, sizeof(buf)+buf-p, "cap: %#.4x\n", htc->cap);

		PRINT_HT_CAP((htc->cap & BIT(0)), "RX LDPC");
		PRINT_HT_CAP((htc->cap & BIT(1)), "HT20/HT40");
		PRINT_HT_CAP(!(htc->cap & BIT(1)), "HT20");

		PRINT_HT_CAP(((htc->cap >> 2) & 0x3) == 0, "Static SM Power Save");
		PRINT_HT_CAP(((htc->cap >> 2) & 0x3) == 1, "Dynamic SM Power Save");
		PRINT_HT_CAP(((htc->cap >> 2) & 0x3) == 3, "SM Power Save disabled");

		PRINT_HT_CAP((htc->cap & BIT(4)), "RX Greenfield");
		PRINT_HT_CAP((htc->cap & BIT(5)), "RX HT20 SGI");
		PRINT_HT_CAP((htc->cap & BIT(6)), "RX HT40 SGI");
		PRINT_HT_CAP((htc->cap & BIT(7)), "TX STBC");

		PRINT_HT_CAP(((htc->cap >> 8) & 0x3) == 0, "No RX STBC");
		PRINT_HT_CAP(((htc->cap >> 8) & 0x3) == 1, "RX STBC 1-stream");
		PRINT_HT_CAP(((htc->cap >> 8) & 0x3) == 2, "RX STBC 2-streams");
		PRINT_HT_CAP(((htc->cap >> 8) & 0x3) == 3, "RX STBC 3-streams");

		PRINT_HT_CAP((htc->cap & BIT(10)), "HT Delayed Block Ack");

		PRINT_HT_CAP(!(htc->cap & BIT(11)), "Max AMSDU length: "
			     "3839 bytes");
		PRINT_HT_CAP((htc->cap & BIT(11)), "Max AMSDU length: "
			     "7935 bytes");

		/*
		 * For beacons and probe response this would mean the BSS
		 * does or does not allow the usage of DSSS/CCK HT40.
		 * Otherwise it means the STA does or does not use
		 * DSSS/CCK HT40.
		 */
		PRINT_HT_CAP((htc->cap & BIT(12)), "DSSS/CCK HT40");
		PRINT_HT_CAP(!(htc->cap & BIT(12)), "No DSSS/CCK HT40");

		/* BIT(13) is reserved */

		PRINT_HT_CAP((htc->cap & BIT(14)), "40 MHz Intolerant");

		PRINT_HT_CAP((htc->cap & BIT(15)), "L-SIG TXOP protection");

		p += scnprintf(p, sizeof(buf)+buf-p, "ampdu factor/density: %d/%d\n",
				htc->ampdu_factor, htc->ampdu_density);
		p += scnprintf(p, sizeof(buf)+buf-p, "MCS mask:");

		for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++)
			p += scnprintf(p, sizeof(buf)+buf-p, " %.2x",
					htc->mcs.rx_mask[i]);
		p += scnprintf(p, sizeof(buf)+buf-p, "\n");

		/* If not set this is meaningless */
		if (le16_to_cpu(htc->mcs.rx_highest)) {
			p += scnprintf(p, sizeof(buf)+buf-p,
				       "MCS rx highest: %d Mbps\n",
				       le16_to_cpu(htc->mcs.rx_highest));
		}

		p += scnprintf(p, sizeof(buf)+buf-p, "MCS tx params: %x\n",
				htc->mcs.tx_params);
	}

	return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
}
STA_OPS(ht_capa);

#define DEBUGFS_ADD(name) \
	debugfs_create_file(#name, 0400, \
		sta->debugfs.dir, sta, &sta_ ##name## _ops);

#define DEBUGFS_ADD_COUNTER(name, field)				\
	if (sizeof(sta->field) == sizeof(u32))				\
		debugfs_create_u32(#name, 0400, sta->debugfs.dir,	\
			(u32 *) &sta->field);				\
	else								\
		debugfs_create_u64(#name, 0400, sta->debugfs.dir,	\
			(u64 *) &sta->field);

void ieee80211_sta_debugfs_add(struct sta_info *sta)
{
	struct dentry *stations_dir = sta->sdata->debugfs.subdir_stations;
	u8 mac[3*ETH_ALEN];

	sta->debugfs.add_has_run = true;

	if (!stations_dir)
		return;

	snprintf(mac, sizeof(mac), "%pM", sta->sta.addr);

	/*
	 * This might fail due to a race condition:
	 * When mac80211 unlinks a station, the debugfs entries
	 * remain, but it is already possible to link a new
	 * station with the same address which triggers adding
	 * it to debugfs; therefore, if the old station isn't
	 * destroyed quickly enough the old station's debugfs
	 * dir might still be around.
	 */
	sta->debugfs.dir = debugfs_create_dir(mac, stations_dir);
	if (!sta->debugfs.dir)
		return;

	DEBUGFS_ADD(flags);
	DEBUGFS_ADD(num_ps_buf_frames);
	DEBUGFS_ADD(inactive_ms);
	DEBUGFS_ADD(connected_time);
	DEBUGFS_ADD(last_seq_ctrl);
	DEBUGFS_ADD(agg_status);
	DEBUGFS_ADD(dev);
	DEBUGFS_ADD(last_signal);
	DEBUGFS_ADD(ht_capa);

	DEBUGFS_ADD_COUNTER(rx_packets, rx_packets);
	DEBUGFS_ADD_COUNTER(tx_packets, tx_packets);
	DEBUGFS_ADD_COUNTER(rx_bytes, rx_bytes);
	DEBUGFS_ADD_COUNTER(tx_bytes, tx_bytes);
	DEBUGFS_ADD_COUNTER(rx_duplicates, num_duplicates);
	DEBUGFS_ADD_COUNTER(rx_fragments, rx_fragments);
	DEBUGFS_ADD_COUNTER(rx_dropped, rx_dropped);
	DEBUGFS_ADD_COUNTER(tx_fragments, tx_fragments);
	DEBUGFS_ADD_COUNTER(tx_filtered, tx_filtered_count);
	DEBUGFS_ADD_COUNTER(tx_retry_failed, tx_retry_failed);
	DEBUGFS_ADD_COUNTER(tx_retry_count, tx_retry_count);
	DEBUGFS_ADD_COUNTER(wep_weak_iv_count, wep_weak_iv_count);
}

void ieee80211_sta_debugfs_remove(struct sta_info *sta)
{
	debugfs_remove_recursive(sta->debugfs.dir);
	sta->debugfs.dir = NULL;
}
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