[PATCH 2/3] mac80211: Provide per-station stats in debugfs

[greearb@candelatech.com]

From: Ben Greear <greearb@candelatech.com>

Including per tid and per acs stats.

Nice for those who like to peer deep into the guts of a system.

Signed-off-by: Ben Greear <greearb@candelatech.com>
---
 net/mac80211/debugfs_sta.c | 88 ++++++++++++++++++++++++++++++++++++++
 net/mac80211/sta_info.c    | 33 ++++++++++++++
 net/mac80211/sta_info.h    |  4 ++
 3 files changed, 125 insertions(+)

diff --git a/net/mac80211/debugfs_sta.c b/net/mac80211/debugfs_sta.c
index 1deacce85177..374db61527a9 100644
--- a/net/mac80211/debugfs_sta.c
+++ b/net/mac80211/debugfs_sta.c
@@ -102,6 +102,93 @@ static ssize_t sta_flags_read(struct file *file, char __user *userbuf,
 }
 STA_OPS(flags);
 
+static ssize_t sta_stats_read(struct file *file, char __user *userbuf,
+			      size_t count, loff_t *ppos)
+{
+	struct sta_info *sta = file->private_data;
+	unsigned int len = 0;
+	const int buf_len = 8000;
+	char *buf = kzalloc(buf_len, GFP_KERNEL);
+	unsigned long sum;
+	char tmp[60];
+	int i;
+	struct ieee80211_sta_rx_stats rx_stats = {0};
+
+	if (!buf)
+		return -ENOMEM;
+
+	sta_accum_rx_stats(sta, &rx_stats);
+
+#define PRINT_MY_STATS(a, b) do {					\
+		len += scnprintf(buf + len, buf_len - len, "%30s %18lu\n", a, (unsigned long)(b)); \
+		if (len >= buf_len) {					\
+			goto done;					\
+		}							\
+	} while (0)
+
+#define PRINT_MY_STATS_S(a, b) do {					\
+		len += scnprintf(buf + len, buf_len - len, "%30s %18ld\n", a, (long)(b)); \
+		if (len >= buf_len) {					\
+			goto done;					\
+		}							\
+	} while (0)
+
+	PRINT_MY_STATS("rx-packets", rx_stats.packets);
+	PRINT_MY_STATS("rx-bytes", rx_stats.bytes);
+	PRINT_MY_STATS("rx-dup", rx_stats.num_duplicates);
+	PRINT_MY_STATS("rx-fragments", rx_stats.fragments);
+	PRINT_MY_STATS("rx-dropped", rx_stats.dropped);
+	PRINT_MY_STATS_S("rx-last-signal", rx_stats.last_signal);
+
+	for (i = 0; i<IEEE80211_MAX_CHAINS; i++) {
+		if (rx_stats.chains & (1<<i)) {
+			sprintf(tmp, "rx-last-signal-chain[%i]", i);
+			PRINT_MY_STATS_S(tmp, rx_stats.chain_signal_last[i]);
+		}
+	}
+	PRINT_MY_STATS("rx-last-rate-encoded", rx_stats.last_rate);
+
+	len += scnprintf(buf + len, buf_len - len, "\n");
+
+	sum = sta->tx_stats.packets[0] + sta->tx_stats.packets[1]
+		+ sta->tx_stats.packets[2] + sta->tx_stats.packets[3];
+	PRINT_MY_STATS("tx-packets", sum);
+
+		sum = sta->tx_stats.bytes[0] + sta->tx_stats.bytes[1]
+		+ sta->tx_stats.bytes[2] + sta->tx_stats.bytes[3];
+	PRINT_MY_STATS("tx-bytes", sum);
+
+	/* per txq stats */
+	PRINT_MY_STATS("tx-packets-acs[VO]", sta->tx_stats.packets[IEEE80211_AC_VO]);
+	PRINT_MY_STATS("tx-packets-acs[VI]", sta->tx_stats.packets[IEEE80211_AC_VI]);
+	PRINT_MY_STATS("tx-packets-acs[BE]", sta->tx_stats.packets[IEEE80211_AC_BE]);
+	PRINT_MY_STATS("tx-packets-acs[BK]", sta->tx_stats.packets[IEEE80211_AC_BK]);
+
+	PRINT_MY_STATS("tx-bytes-acs[VO]", sta->tx_stats.bytes[IEEE80211_AC_VO]);
+	PRINT_MY_STATS("tx-bytes-acs[VI]", sta->tx_stats.bytes[IEEE80211_AC_VI]);
+	PRINT_MY_STATS("tx-bytes-acs[BE]", sta->tx_stats.bytes[IEEE80211_AC_BE]);
+	PRINT_MY_STATS("tx-bytes-acs[BK]", sta->tx_stats.bytes[IEEE80211_AC_BK]);
+
+	len += scnprintf(buf + len, buf_len - len, "\n");
+	for (i = 0; i<=IEEE80211_NUM_TIDS; i++) {
+		sprintf(tmp, "tx-msdu-tid[%2i]", i);
+		PRINT_MY_STATS(tmp, sta->tx_stats.msdu[i]);
+	}
+
+	len += scnprintf(buf + len, buf_len - len, "\n");
+	for (i = 0; i<=IEEE80211_NUM_TIDS; i++) {
+		sprintf(tmp, "rx-msdu-tid[%2i]", i);
+		PRINT_MY_STATS(tmp, rx_stats.msdu[i]);
+	}
+
+#undef PRINT_MY_STATS
+done:
+	i = simple_read_from_buffer(userbuf, count, ppos, buf, strlen(buf));
+	kfree(buf);
+	return i;
+}
+STA_OPS(stats);
+
 static ssize_t sta_num_ps_buf_frames_read(struct file *file,
 					  char __user *userbuf,
 					  size_t count, loff_t *ppos)
@@ -1073,6 +1160,7 @@ void ieee80211_sta_debugfs_add(struct sta_info *sta)
 	sta->debugfs_dir = debugfs_create_dir(mac, stations_dir);
 
 	DEBUGFS_ADD(flags);
+	DEBUGFS_ADD(stats);
 	DEBUGFS_ADD(aid);
 	DEBUGFS_ADD(num_ps_buf_frames);
 	DEBUGFS_ADD(last_seq_ctrl);
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index b096370b45b1..aa95db547465 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -2650,6 +2650,39 @@ static void sta_update_codel_params(struct sta_info *sta, u32 thr)
 	}
 }
 
+void sta_accum_rx_stats(struct sta_info *sta,
+			struct ieee80211_sta_rx_stats *rx_stats)
+{
+	int cpu;
+	int i;
+
+	memcpy(rx_stats, &sta->rx_stats, sizeof(*rx_stats));
+
+	if (!sta->pcpu_rx_stats)
+		return;
+
+	for_each_possible_cpu(cpu) {
+		struct ieee80211_sta_rx_stats *cpurxs;
+
+		cpurxs = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
+		rx_stats->packets += cpurxs->packets;
+		if (time_after(cpurxs->last_rx, rx_stats->last_rx)) {
+			rx_stats->last_rx = cpurxs->last_rx;
+			rx_stats->last_signal = cpurxs->last_signal;
+			for (i = 0; i<IEEE80211_MAX_CHAINS; i++)
+				rx_stats->chain_signal_last[i] = cpurxs->chain_signal_last[i];
+			rx_stats->last_rate = cpurxs->last_rate;
+		}
+		rx_stats->num_duplicates += cpurxs->num_duplicates;
+		rx_stats->fragments += cpurxs->fragments;
+		rx_stats->dropped += cpurxs->dropped;
+		rx_stats->bytes += sta_get_stats_bytes(cpurxs);
+		for (i = 0; i<=IEEE80211_NUM_TIDS; i++) {
+			rx_stats->msdu[i] += sta_get_tidstats_msdu(cpurxs, i);
+		}
+	}
+}
+
 void ieee80211_sta_set_expected_throughput(struct ieee80211_sta *pubsta,
 					   u32 thr)
 {
diff --git a/net/mac80211/sta_info.h b/net/mac80211/sta_info.h
index 897b4d12103e..a6b13d749ffa 100644
--- a/net/mac80211/sta_info.h
+++ b/net/mac80211/sta_info.h
@@ -422,6 +422,7 @@ struct mesh_sta {
 
 DECLARE_EWMA(signal, 10, 8)
 
+/* Update sta_accum_rx_stats if you change this structure. */
 struct ieee80211_sta_rx_stats {
 	unsigned long packets;
 	unsigned long last_rx;
@@ -907,4 +908,7 @@ static inline u32 sta_stats_encode_rate(struct ieee80211_rx_status *s)
 	return r;
 }
 
+void sta_accum_rx_stats(struct sta_info *sta,
+			struct ieee80211_sta_rx_stats *rx_stats);
+
 #endif /* STA_INFO_H */
-- 
2.20.1