1 /*
2  * Copyright (c) 2013 Qualcomm Atheros, Inc.
3  *
4  * Permission to use, copy, modify, and/or distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include "ath9k.h"
18 
19 /*************/
20 /* node_aggr */
21 /*************/
22 
23 static ssize_t read_file_node_aggr(struct file *file, char __user *user_buf,
24 				   size_t count, loff_t *ppos)
25 {
26 	struct ath_node *an = file->private_data;
27 	struct ath_softc *sc = an->sc;
28 	struct ath_atx_tid *tid;
29 	struct ath_txq *txq;
30 	u32 len = 0, size = 4096;
31 	char *buf;
32 	size_t retval;
33 	int tidno;
34 
35 	buf = kzalloc(size, GFP_KERNEL);
36 	if (buf == NULL)
37 		return -ENOMEM;
38 
39 	if (!an->sta->deflink.ht_cap.ht_supported) {
40 		len = scnprintf(buf, size, "%s\n",
41 				"HT not supported");
42 		goto exit;
43 	}
44 
45 	len = scnprintf(buf, size, "Max-AMPDU: %d\n",
46 			an->maxampdu);
47 	len += scnprintf(buf + len, size - len, "MPDU Density: %d\n\n",
48 			 an->mpdudensity);
49 
50 	len += scnprintf(buf + len, size - len,
51 			 "\n%3s%11s%10s%10s%10s%10s%9s%6s%8s\n",
52 			 "TID", "SEQ_START", "SEQ_NEXT", "BAW_SIZE",
53 			 "BAW_HEAD", "BAW_TAIL", "BAR_IDX", "SCHED", "PAUSED");
54 
55 	for (tidno = 0; tidno < IEEE80211_NUM_TIDS; tidno++) {
56 		tid = ath_node_to_tid(an, tidno);
57 		txq = tid->txq;
58 		ath_txq_lock(sc, txq);
59 		if (tid->active) {
60 			len += scnprintf(buf + len, size - len,
61 					 "%3d%11d%10d%10d%10d%10d%9d%6d\n",
62 					 tid->tidno,
63 					 tid->seq_start,
64 					 tid->seq_next,
65 					 tid->baw_size,
66 					 tid->baw_head,
67 					 tid->baw_tail,
68 					 tid->bar_index,
69 					 !list_empty(&tid->list));
70 		}
71 		ath_txq_unlock(sc, txq);
72 	}
73 exit:
74 	retval = simple_read_from_buffer(user_buf, count, ppos, buf, len);
75 	kfree(buf);
76 
77 	return retval;
78 }
79 
80 static const struct file_operations fops_node_aggr = {
81 	.read = read_file_node_aggr,
82 	.open = simple_open,
83 	.owner = THIS_MODULE,
84 	.llseek = default_llseek,
85 };
86 
87 /*************/
88 /* node_recv */
89 /*************/
90 
91 void ath_debug_rate_stats(struct ath_softc *sc,
92 			  struct ath_rx_status *rs,
93 			  struct sk_buff *skb)
94 {
95 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
96 	struct ath_hw *ah = sc->sc_ah;
97 	struct ieee80211_rx_status *rxs;
98 	struct ath_rx_rate_stats *rstats;
99 	struct ieee80211_sta *sta;
100 	struct ath_node *an;
101 
102 	if (!ieee80211_is_data(hdr->frame_control))
103 		return;
104 
105 	rcu_read_lock();
106 
107 	sta = ieee80211_find_sta_by_ifaddr(sc->hw, hdr->addr2, NULL);
108 	if (!sta)
109 		goto exit;
110 
111 	an = (struct ath_node *) sta->drv_priv;
112 	rstats = &an->rx_rate_stats;
113 	rxs = IEEE80211_SKB_RXCB(skb);
114 
115 	if (IS_HT_RATE(rs->rs_rate)) {
116 		if (rxs->rate_idx >= ARRAY_SIZE(rstats->ht_stats))
117 			goto exit;
118 
119 		if (rxs->bw == RATE_INFO_BW_40)
120 			rstats->ht_stats[rxs->rate_idx].ht40_cnt++;
121 		else
122 			rstats->ht_stats[rxs->rate_idx].ht20_cnt++;
123 
124 		if (rxs->enc_flags & RX_ENC_FLAG_SHORT_GI)
125 			rstats->ht_stats[rxs->rate_idx].sgi_cnt++;
126 		else
127 			rstats->ht_stats[rxs->rate_idx].lgi_cnt++;
128 
129 		goto exit;
130 	}
131 
132 	if (IS_CCK_RATE(rs->rs_rate)) {
133 		if (rxs->enc_flags & RX_ENC_FLAG_SHORTPRE)
134 			rstats->cck_stats[rxs->rate_idx].cck_sp_cnt++;
135 		else
136 			rstats->cck_stats[rxs->rate_idx].cck_lp_cnt++;
137 
138 		goto exit;
139 	}
140 
141 	if (IS_OFDM_RATE(rs->rs_rate)) {
142 		if (ah->curchan->chan->band == NL80211_BAND_2GHZ)
143 			rstats->ofdm_stats[rxs->rate_idx - 4].ofdm_cnt++;
144 		else
145 			rstats->ofdm_stats[rxs->rate_idx].ofdm_cnt++;
146 	}
147 exit:
148 	rcu_read_unlock();
149 }
150 
151 #define PRINT_CCK_RATE(str, i, sp)					\
152 	do {								\
153 		len += scnprintf(buf + len, size - len,			\
154 			 "%11s : %10u\n",				\
155 			 str,						\
156 			 (sp) ? rstats->cck_stats[i].cck_sp_cnt :	\
157 			 rstats->cck_stats[i].cck_lp_cnt);		\
158 	} while (0)
159 
160 #define PRINT_OFDM_RATE(str, i)					\
161 	do {							\
162 		len += scnprintf(buf + len, size - len,		\
163 			 "%11s : %10u\n",			\
164 			 str,					\
165 			 rstats->ofdm_stats[i].ofdm_cnt);	\
166 	} while (0)
167 
168 static ssize_t read_file_node_recv(struct file *file, char __user *user_buf,
169 				   size_t count, loff_t *ppos)
170 {
171 	struct ath_node *an = file->private_data;
172 	struct ath_softc *sc = an->sc;
173 	struct ath_hw *ah = sc->sc_ah;
174 	struct ath_rx_rate_stats *rstats;
175 	struct ieee80211_sta *sta = an->sta;
176 	enum nl80211_band band;
177 	u32 len = 0, size = 4096;
178 	char *buf;
179 	size_t retval;
180 	int i;
181 
182 	buf = kzalloc(size, GFP_KERNEL);
183 	if (buf == NULL)
184 		return -ENOMEM;
185 
186 	band = ah->curchan->chan->band;
187 	rstats = &an->rx_rate_stats;
188 
189 	if (!sta->deflink.ht_cap.ht_supported)
190 		goto legacy;
191 
192 	len += scnprintf(buf + len, size - len,
193 			 "%24s%10s%10s%10s\n",
194 			 "HT20", "HT40", "SGI", "LGI");
195 
196 	for (i = 0; i < 24; i++) {
197 		len += scnprintf(buf + len, size - len,
198 				 "%8s%3u : %10u%10u%10u%10u\n",
199 				 "MCS", i,
200 				 rstats->ht_stats[i].ht20_cnt,
201 				 rstats->ht_stats[i].ht40_cnt,
202 				 rstats->ht_stats[i].sgi_cnt,
203 				 rstats->ht_stats[i].lgi_cnt);
204 	}
205 
206 	len += scnprintf(buf + len, size - len, "\n");
207 
208 legacy:
209 	if (band == NL80211_BAND_2GHZ) {
210 		PRINT_CCK_RATE("CCK-1M/LP", 0, false);
211 		PRINT_CCK_RATE("CCK-2M/LP", 1, false);
212 		PRINT_CCK_RATE("CCK-5.5M/LP", 2, false);
213 		PRINT_CCK_RATE("CCK-11M/LP", 3, false);
214 
215 		PRINT_CCK_RATE("CCK-2M/SP", 1, true);
216 		PRINT_CCK_RATE("CCK-5.5M/SP", 2, true);
217 		PRINT_CCK_RATE("CCK-11M/SP", 3, true);
218 	}
219 
220 	PRINT_OFDM_RATE("OFDM-6M", 0);
221 	PRINT_OFDM_RATE("OFDM-9M", 1);
222 	PRINT_OFDM_RATE("OFDM-12M", 2);
223 	PRINT_OFDM_RATE("OFDM-18M", 3);
224 	PRINT_OFDM_RATE("OFDM-24M", 4);
225 	PRINT_OFDM_RATE("OFDM-36M", 5);
226 	PRINT_OFDM_RATE("OFDM-48M", 6);
227 	PRINT_OFDM_RATE("OFDM-54M", 7);
228 
229 	retval = simple_read_from_buffer(user_buf, count, ppos, buf, len);
230 	kfree(buf);
231 
232 	return retval;
233 }
234 
235 #undef PRINT_OFDM_RATE
236 #undef PRINT_CCK_RATE
237 
238 static const struct file_operations fops_node_recv = {
239 	.read = read_file_node_recv,
240 	.open = simple_open,
241 	.owner = THIS_MODULE,
242 	.llseek = default_llseek,
243 };
244 
245 void ath9k_sta_add_debugfs(struct ieee80211_hw *hw,
246 			   struct ieee80211_vif *vif,
247 			   struct ieee80211_sta *sta,
248 			   struct dentry *dir)
249 {
250 	struct ath_node *an = (struct ath_node *)sta->drv_priv;
251 
252 	debugfs_create_file("node_aggr", 0444, dir, an, &fops_node_aggr);
253 	debugfs_create_file("node_recv", 0444, dir, an, &fops_node_recv);
254 }
255