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1 /*
2  * Copyright (c) 2013 Eugene Krasnikov <k.eugene.e@gmail.com>
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 ANY
11  * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
13  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
14  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
18 
19 #include "txrx.h"
20 
get_rssi0(struct wcn36xx_rx_bd * bd)21 static inline int get_rssi0(struct wcn36xx_rx_bd *bd)
22 {
23 	return 100 - ((bd->phy_stat0 >> 24) & 0xff);
24 }
25 
26 struct wcn36xx_rate {
27 	u16 bitrate;
28 	u16 mcs_or_legacy_index;
29 	enum mac80211_rx_encoding encoding;
30 	enum mac80211_rx_encoding_flags encoding_flags;
31 	enum rate_info_bw bw;
32 };
33 
34 /* Buffer descriptor rx_ch field is limited to 5-bit (4+1), a mapping is used
35  * for 11A Channels.
36  */
37 static const u8 ab_rx_ch_map[] = { 36, 40, 44, 48, 52, 56, 60, 64, 100, 104,
38 				   108, 112, 116, 120, 124, 128, 132, 136, 140,
39 				   149, 153, 157, 161, 165, 144 };
40 
41 static const struct wcn36xx_rate wcn36xx_rate_table[] = {
42 	/* 11b rates */
43 	{  10, 0, RX_ENC_LEGACY, 0, RATE_INFO_BW_20 },
44 	{  20, 1, RX_ENC_LEGACY, 0, RATE_INFO_BW_20 },
45 	{  55, 2, RX_ENC_LEGACY, 0, RATE_INFO_BW_20 },
46 	{ 110, 3, RX_ENC_LEGACY, 0, RATE_INFO_BW_20 },
47 
48 	/* 11b SP (short preamble) */
49 	{  10, 0, RX_ENC_LEGACY, RX_ENC_FLAG_SHORTPRE, RATE_INFO_BW_20 },
50 	{  20, 1, RX_ENC_LEGACY, RX_ENC_FLAG_SHORTPRE, RATE_INFO_BW_20 },
51 	{  55, 2, RX_ENC_LEGACY, RX_ENC_FLAG_SHORTPRE, RATE_INFO_BW_20 },
52 	{ 110, 3, RX_ENC_LEGACY, RX_ENC_FLAG_SHORTPRE, RATE_INFO_BW_20 },
53 
54 	/* 11ag */
55 	{  60, 4, RX_ENC_LEGACY, 0, RATE_INFO_BW_20 },
56 	{  90, 5, RX_ENC_LEGACY, 0, RATE_INFO_BW_20 },
57 	{ 120, 6, RX_ENC_LEGACY, 0, RATE_INFO_BW_20 },
58 	{ 180, 7, RX_ENC_LEGACY, 0, RATE_INFO_BW_20 },
59 	{ 240, 8, RX_ENC_LEGACY, 0, RATE_INFO_BW_20 },
60 	{ 360, 9, RX_ENC_LEGACY, 0, RATE_INFO_BW_20 },
61 	{ 480, 10, RX_ENC_LEGACY, 0, RATE_INFO_BW_20 },
62 	{ 540, 11, RX_ENC_LEGACY, 0, RATE_INFO_BW_20 },
63 
64 	/* 11n */
65 	{  65, 0, RX_ENC_HT, 0, RATE_INFO_BW_20 },
66 	{ 130, 1, RX_ENC_HT, 0, RATE_INFO_BW_20 },
67 	{ 195, 2, RX_ENC_HT, 0, RATE_INFO_BW_20 },
68 	{ 260, 3, RX_ENC_HT, 0, RATE_INFO_BW_20 },
69 	{ 390, 4, RX_ENC_HT, 0, RATE_INFO_BW_20 },
70 	{ 520, 5, RX_ENC_HT, 0, RATE_INFO_BW_20 },
71 	{ 585, 6, RX_ENC_HT, 0, RATE_INFO_BW_20 },
72 	{ 650, 7, RX_ENC_HT, 0, RATE_INFO_BW_20 },
73 
74 	/* 11n SGI */
75 	{  72, 0, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_20 },
76 	{ 144, 1, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_20 },
77 	{ 217, 2, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_20 },
78 	{ 289, 3, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_20 },
79 	{ 434, 4, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_20 },
80 	{ 578, 5, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_20 },
81 	{ 650, 6, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_20 },
82 	{ 722, 7, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_20 },
83 
84 	/* 11n GF (greenfield) */
85 	{  65, 0, RX_ENC_HT, RX_ENC_FLAG_HT_GF, RATE_INFO_BW_20 },
86 	{ 130, 1, RX_ENC_HT, RX_ENC_FLAG_HT_GF, RATE_INFO_BW_20 },
87 	{ 195, 2, RX_ENC_HT, RX_ENC_FLAG_HT_GF, RATE_INFO_BW_20 },
88 	{ 260, 3, RX_ENC_HT, RX_ENC_FLAG_HT_GF, RATE_INFO_BW_20 },
89 	{ 390, 4, RX_ENC_HT, RX_ENC_FLAG_HT_GF, RATE_INFO_BW_20 },
90 	{ 520, 5, RX_ENC_HT, RX_ENC_FLAG_HT_GF, RATE_INFO_BW_20 },
91 	{ 585, 6, RX_ENC_HT, RX_ENC_FLAG_HT_GF, RATE_INFO_BW_20 },
92 	{ 650, 7, RX_ENC_HT, RX_ENC_FLAG_HT_GF, RATE_INFO_BW_20 },
93 
94 	/* 11n CB (channel bonding) */
95 	{ 135, 0, RX_ENC_HT, 0, RATE_INFO_BW_40 },
96 	{ 270, 1, RX_ENC_HT, 0, RATE_INFO_BW_40 },
97 	{ 405, 2, RX_ENC_HT, 0, RATE_INFO_BW_40 },
98 	{ 540, 3, RX_ENC_HT, 0, RATE_INFO_BW_40 },
99 	{ 810, 4, RX_ENC_HT, 0, RATE_INFO_BW_40 },
100 	{ 1080, 5, RX_ENC_HT, 0, RATE_INFO_BW_40 },
101 	{ 1215, 6, RX_ENC_HT, 0, RATE_INFO_BW_40 },
102 	{ 1350, 7, RX_ENC_HT, 0, RATE_INFO_BW_40 },
103 
104 	/* 11n CB + SGI */
105 	{ 150, 0, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
106 	{ 300, 1, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
107 	{ 450, 2, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
108 	{ 600, 3, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
109 	{ 900, 4, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
110 	{ 1200, 5, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
111 	{ 1350, 6, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
112 	{ 1500, 7, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
113 
114 	/* 11n GF + CB */
115 	{ 135, 0, RX_ENC_HT, RX_ENC_FLAG_HT_GF, RATE_INFO_BW_40 },
116 	{ 270, 1, RX_ENC_HT, RX_ENC_FLAG_HT_GF, RATE_INFO_BW_40 },
117 	{ 405, 2, RX_ENC_HT, RX_ENC_FLAG_HT_GF, RATE_INFO_BW_40 },
118 	{ 540, 3, RX_ENC_HT, RX_ENC_FLAG_HT_GF, RATE_INFO_BW_40 },
119 	{ 810, 4, RX_ENC_HT, RX_ENC_FLAG_HT_GF, RATE_INFO_BW_40 },
120 	{ 1080, 5, RX_ENC_HT, RX_ENC_FLAG_HT_GF, RATE_INFO_BW_40 },
121 	{ 1215, 6, RX_ENC_HT, RX_ENC_FLAG_HT_GF, RATE_INFO_BW_40 },
122 	{ 1350, 7, RX_ENC_HT, RX_ENC_FLAG_HT_GF, RATE_INFO_BW_40 },
123 
124 	/* 11ac reserved indices */
125 	{ 1350, 6, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
126 	{ 1350, 6, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
127 
128 	/* 11ac 20 MHz 800ns GI MCS 0-8 */
129 	{   65, 0, RX_ENC_HT, 0, RATE_INFO_BW_20 },
130 	{  130, 1, RX_ENC_HT, 0, RATE_INFO_BW_20 },
131 	{  195, 2, RX_ENC_HT, 0, RATE_INFO_BW_20 },
132 	{  260, 3, RX_ENC_HT, 0, RATE_INFO_BW_20 },
133 	{  390, 4, RX_ENC_HT, 0, RATE_INFO_BW_20 },
134 	{  520, 5, RX_ENC_HT, 0, RATE_INFO_BW_20 },
135 	{  585, 6, RX_ENC_HT, 0, RATE_INFO_BW_20 },
136 	{  650, 7, RX_ENC_HT, 0, RATE_INFO_BW_20 },
137 	{  780, 8, RX_ENC_HT, 0, RATE_INFO_BW_20 },
138 
139 	/* 11ac reserved indices */
140 	{ 1350, 6, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
141 	{ 1350, 6, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
142 	{ 1350, 6, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
143 	{ 1350, 6, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
144 	{ 1350, 6, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
145 	{ 1350, 6, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
146 	{ 1350, 6, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
147 	{ 1350, 6, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
148 	{ 1350, 6, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
149 
150 	/* 11ac 20 MHz 400ns SGI MCS 6-8 */
151 	{  655, 6, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_20 },
152 	{  722, 7, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_20 },
153 	{  866, 8, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_20 },
154 
155 	/* 11ac reserved indices */
156 	{ 1350, 6, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
157 	{ 1350, 6, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
158 	{ 1350, 6, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
159 
160 	/* 11ac 40 MHz 800ns GI MCS 0-9 */
161 	{  135, 0, RX_ENC_HT, 0, RATE_INFO_BW_40 },
162 	{  270, 1, RX_ENC_HT, 0, RATE_INFO_BW_40 },
163 	{  405, 2, RX_ENC_HT, 0, RATE_INFO_BW_40 },
164 	{  540, 3, RX_ENC_HT, 0, RATE_INFO_BW_40 },
165 	{  810, 4, RX_ENC_HT, 0, RATE_INFO_BW_40 },
166 	{ 1080, 5, RX_ENC_HT, 0, RATE_INFO_BW_40 },
167 	{ 1215, 6, RX_ENC_HT, 0, RATE_INFO_BW_40 },
168 	{ 1350, 7, RX_ENC_HT, 0, RATE_INFO_BW_40 },
169 	{ 1350, 7, RX_ENC_HT, 0, RATE_INFO_BW_40 },
170 	{ 1620, 8, RX_ENC_HT, 0, RATE_INFO_BW_40 },
171 	{ 1800, 9, RX_ENC_HT, 0, RATE_INFO_BW_40 },
172 
173 	/* 11ac reserved indices */
174 	{ 1350, 6, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
175 	{ 1350, 6, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
176 	{ 1350, 6, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
177 	{ 1350, 6, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
178 	{ 1350, 6, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
179 	{ 1350, 6, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
180 
181 	/* 11ac 40 MHz 400ns SGI MCS 5-7 */
182 	{ 1200, 5, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
183 	{ 1350, 6, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
184 	{ 1500, 7, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
185 
186 	/* 11ac reserved index */
187 	{ 1350, 6, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
188 
189 	/* 11ac 40 MHz 400ns SGI MCS 5-7 */
190 	{ 1800, 8, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
191 	{ 2000, 9, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
192 
193 	/* 11ac reserved index */
194 	{ 1350, 6, RX_ENC_HT,  RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
195 
196 	/* 11ac 80 MHz 800ns GI MCS 0-7 */
197 	{  292, 0, RX_ENC_HT, 0, RATE_INFO_BW_80},
198 	{  585, 1, RX_ENC_HT, 0, RATE_INFO_BW_80},
199 	{  877, 2, RX_ENC_HT, 0, RATE_INFO_BW_80},
200 	{ 1170, 3, RX_ENC_HT, 0, RATE_INFO_BW_80},
201 	{ 1755, 4, RX_ENC_HT, 0, RATE_INFO_BW_80},
202 	{ 2340, 5, RX_ENC_HT, 0, RATE_INFO_BW_80},
203 	{ 2632, 6, RX_ENC_HT, 0, RATE_INFO_BW_80},
204 	{ 2925, 7, RX_ENC_HT, 0, RATE_INFO_BW_80},
205 
206 	/* 11 ac reserved index */
207 	{ 1350, 6, RX_ENC_HT,  RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
208 
209 	/* 11ac 80 MHz 800 ns GI MCS 8-9 */
210 	{ 3510, 8, RX_ENC_HT, 0, RATE_INFO_BW_80},
211 	{ 3900, 9, RX_ENC_HT, 0, RATE_INFO_BW_80},
212 
213 	/* 11 ac reserved indices */
214 	{ 1350, 6, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
215 	{ 1350, 6, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
216 	{ 1350, 6, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
217 	{ 1350, 6, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
218 	{ 1350, 6, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
219 	{ 1350, 6, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
220 	{ 1350, 6, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
221 
222 	/* 11ac 80 MHz 400 ns SGI MCS 6-7 */
223 	{ 2925, 6, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_80 },
224 	{ 3250, 7, RX_ENC_HT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_80 },
225 
226 	/* 11ac reserved index */
227 	{ 1350, 6, RX_ENC_HT,  RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_40 },
228 
229 	/* 11ac 80 MHz 400ns SGI MCS 8-9 */
230 	{ 3900, 8, RX_ENC_VHT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_80 },
231 	{ 4333, 9, RX_ENC_VHT, RX_ENC_FLAG_SHORT_GI, RATE_INFO_BW_80 },
232 };
233 
wcn36xx_rx_skb(struct wcn36xx * wcn,struct sk_buff * skb)234 int wcn36xx_rx_skb(struct wcn36xx *wcn, struct sk_buff *skb)
235 {
236 	struct ieee80211_rx_status status;
237 	const struct wcn36xx_rate *rate;
238 	struct ieee80211_hdr *hdr;
239 	struct wcn36xx_rx_bd *bd;
240 	u16 fc, sn;
241 
242 	/*
243 	 * All fields must be 0, otherwise it can lead to
244 	 * unexpected consequences.
245 	 */
246 	memset(&status, 0, sizeof(status));
247 
248 	bd = (struct wcn36xx_rx_bd *)skb->data;
249 	buff_to_be((u32 *)bd, sizeof(*bd)/sizeof(u32));
250 	wcn36xx_dbg_dump(WCN36XX_DBG_RX_DUMP,
251 			 "BD   <<< ", (char *)bd,
252 			 sizeof(struct wcn36xx_rx_bd));
253 
254 	skb_put(skb, bd->pdu.mpdu_header_off + bd->pdu.mpdu_len);
255 	skb_pull(skb, bd->pdu.mpdu_header_off);
256 
257 	hdr = (struct ieee80211_hdr *) skb->data;
258 	fc = __le16_to_cpu(hdr->frame_control);
259 	sn = IEEE80211_SEQ_TO_SN(__le16_to_cpu(hdr->seq_ctrl));
260 
261 	status.mactime = 10;
262 	status.signal = -get_rssi0(bd);
263 	status.antenna = 1;
264 	status.flag = 0;
265 	status.rx_flags = 0;
266 	status.flag |= RX_FLAG_IV_STRIPPED |
267 		       RX_FLAG_MMIC_STRIPPED |
268 		       RX_FLAG_DECRYPTED;
269 
270 	wcn36xx_dbg(WCN36XX_DBG_RX, "status.flags=%x\n", status.flag);
271 
272 	if (bd->scan_learn) {
273 		/* If packet originate from hardware scanning, extract the
274 		 * band/channel from bd descriptor.
275 		 */
276 		u8 hwch = (bd->reserved0 << 4) + bd->rx_ch;
277 
278 		if (bd->rf_band != 1 && hwch <= sizeof(ab_rx_ch_map) && hwch >= 1) {
279 			status.band = NL80211_BAND_5GHZ;
280 			status.freq = ieee80211_channel_to_frequency(ab_rx_ch_map[hwch - 1],
281 								     status.band);
282 		} else {
283 			status.band = NL80211_BAND_2GHZ;
284 			status.freq = ieee80211_channel_to_frequency(hwch, status.band);
285 		}
286 	} else {
287 		status.band = WCN36XX_BAND(wcn);
288 		status.freq = WCN36XX_CENTER_FREQ(wcn);
289 	}
290 
291 	if (bd->rate_id < ARRAY_SIZE(wcn36xx_rate_table)) {
292 		rate = &wcn36xx_rate_table[bd->rate_id];
293 		status.encoding = rate->encoding;
294 		status.enc_flags = rate->encoding_flags;
295 		status.bw = rate->bw;
296 		status.rate_idx = rate->mcs_or_legacy_index;
297 		status.nss = 1;
298 
299 		if (status.band == NL80211_BAND_5GHZ &&
300 		    status.encoding == RX_ENC_LEGACY &&
301 		    status.rate_idx >= 4) {
302 			/* no dsss rates in 5Ghz rates table */
303 			status.rate_idx -= 4;
304 		}
305 	} else {
306 		status.encoding = 0;
307 		status.bw = 0;
308 		status.enc_flags = 0;
309 		status.rate_idx = 0;
310 	}
311 
312 	if (ieee80211_is_beacon(hdr->frame_control) ||
313 	    ieee80211_is_probe_resp(hdr->frame_control))
314 		status.boottime_ns = ktime_get_boottime_ns();
315 
316 	memcpy(IEEE80211_SKB_RXCB(skb), &status, sizeof(status));
317 
318 	if (ieee80211_is_beacon(hdr->frame_control)) {
319 		wcn36xx_dbg(WCN36XX_DBG_BEACON, "beacon skb %p len %d fc %04x sn %d\n",
320 			    skb, skb->len, fc, sn);
321 		wcn36xx_dbg_dump(WCN36XX_DBG_BEACON_DUMP, "SKB <<< ",
322 				 (char *)skb->data, skb->len);
323 	} else {
324 		wcn36xx_dbg(WCN36XX_DBG_RX, "rx skb %p len %d fc %04x sn %d\n",
325 			    skb, skb->len, fc, sn);
326 		wcn36xx_dbg_dump(WCN36XX_DBG_RX_DUMP, "SKB <<< ",
327 				 (char *)skb->data, skb->len);
328 	}
329 
330 	ieee80211_rx_irqsafe(wcn->hw, skb);
331 
332 	return 0;
333 }
334 
wcn36xx_set_tx_pdu(struct wcn36xx_tx_bd * bd,u32 mpdu_header_len,u32 len,u16 tid)335 static void wcn36xx_set_tx_pdu(struct wcn36xx_tx_bd *bd,
336 			       u32 mpdu_header_len,
337 			       u32 len,
338 			       u16 tid)
339 {
340 	bd->pdu.mpdu_header_len = mpdu_header_len;
341 	bd->pdu.mpdu_header_off = sizeof(*bd);
342 	bd->pdu.mpdu_data_off = bd->pdu.mpdu_header_len +
343 		bd->pdu.mpdu_header_off;
344 	bd->pdu.mpdu_len = len;
345 	bd->pdu.tid = tid;
346 }
347 
get_vif_by_addr(struct wcn36xx * wcn,u8 * addr)348 static inline struct wcn36xx_vif *get_vif_by_addr(struct wcn36xx *wcn,
349 						  u8 *addr)
350 {
351 	struct wcn36xx_vif *vif_priv = NULL;
352 	struct ieee80211_vif *vif = NULL;
353 	list_for_each_entry(vif_priv, &wcn->vif_list, list) {
354 			vif = wcn36xx_priv_to_vif(vif_priv);
355 			if (memcmp(vif->addr, addr, ETH_ALEN) == 0)
356 				return vif_priv;
357 	}
358 	wcn36xx_warn("vif %pM not found\n", addr);
359 	return NULL;
360 }
361 
wcn36xx_tx_start_ampdu(struct wcn36xx * wcn,struct wcn36xx_sta * sta_priv,struct sk_buff * skb)362 static void wcn36xx_tx_start_ampdu(struct wcn36xx *wcn,
363 				   struct wcn36xx_sta *sta_priv,
364 				   struct sk_buff *skb)
365 {
366 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
367 	struct ieee80211_sta *sta;
368 	u8 *qc, tid;
369 
370 	if (!conf_is_ht(&wcn->hw->conf))
371 		return;
372 
373 	sta = wcn36xx_priv_to_sta(sta_priv);
374 
375 	if (WARN_ON(!ieee80211_is_data_qos(hdr->frame_control)))
376 		return;
377 
378 	if (skb_get_queue_mapping(skb) == IEEE80211_AC_VO)
379 		return;
380 
381 	qc = ieee80211_get_qos_ctl(hdr);
382 	tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
383 
384 	spin_lock(&sta_priv->ampdu_lock);
385 	if (sta_priv->ampdu_state[tid] != WCN36XX_AMPDU_NONE)
386 		goto out_unlock;
387 
388 	if (sta_priv->non_agg_frame_ct++ >= WCN36XX_AMPDU_START_THRESH) {
389 		sta_priv->ampdu_state[tid] = WCN36XX_AMPDU_START;
390 		sta_priv->non_agg_frame_ct = 0;
391 		ieee80211_start_tx_ba_session(sta, tid, 0);
392 	}
393 out_unlock:
394 	spin_unlock(&sta_priv->ampdu_lock);
395 }
396 
wcn36xx_set_tx_data(struct wcn36xx_tx_bd * bd,struct wcn36xx * wcn,struct wcn36xx_vif ** vif_priv,struct wcn36xx_sta * sta_priv,struct sk_buff * skb,bool bcast)397 static void wcn36xx_set_tx_data(struct wcn36xx_tx_bd *bd,
398 				struct wcn36xx *wcn,
399 				struct wcn36xx_vif **vif_priv,
400 				struct wcn36xx_sta *sta_priv,
401 				struct sk_buff *skb,
402 				bool bcast)
403 {
404 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
405 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
406 	struct ieee80211_vif *vif = NULL;
407 	struct wcn36xx_vif *__vif_priv = NULL;
408 	bool is_data_qos = ieee80211_is_data_qos(hdr->frame_control);
409 	u16 tid = 0;
410 
411 	bd->bd_rate = WCN36XX_BD_RATE_DATA;
412 
413 	/*
414 	 * For not unicast frames mac80211 will not set sta pointer so use
415 	 * self_sta_index instead.
416 	 */
417 	if (sta_priv) {
418 		__vif_priv = sta_priv->vif;
419 		vif = wcn36xx_priv_to_vif(__vif_priv);
420 
421 		bd->dpu_sign = sta_priv->ucast_dpu_sign;
422 		if (vif->type == NL80211_IFTYPE_STATION) {
423 			bd->sta_index = sta_priv->bss_sta_index;
424 			bd->dpu_desc_idx = sta_priv->bss_dpu_desc_index;
425 		} else if (vif->type == NL80211_IFTYPE_AP ||
426 			   vif->type == NL80211_IFTYPE_ADHOC ||
427 			   vif->type == NL80211_IFTYPE_MESH_POINT) {
428 			bd->sta_index = sta_priv->sta_index;
429 			bd->dpu_desc_idx = sta_priv->dpu_desc_index;
430 		}
431 	} else {
432 		__vif_priv = get_vif_by_addr(wcn, hdr->addr2);
433 		bd->sta_index = __vif_priv->self_sta_index;
434 		bd->dpu_desc_idx = __vif_priv->self_dpu_desc_index;
435 		bd->dpu_sign = __vif_priv->self_ucast_dpu_sign;
436 	}
437 
438 	if (is_data_qos) {
439 		tid = ieee80211_get_tid(hdr);
440 		/* TID->QID is one-to-one mapping */
441 		bd->queue_id = tid;
442 		bd->pdu.bd_ssn = WCN36XX_TXBD_SSN_FILL_DPU_QOS;
443 	} else {
444 		bd->pdu.bd_ssn = WCN36XX_TXBD_SSN_FILL_DPU_NON_QOS;
445 	}
446 
447 	if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT ||
448 	    (sta_priv && !sta_priv->is_data_encrypted)) {
449 		bd->dpu_ne = 1;
450 	}
451 
452 	if (ieee80211_is_any_nullfunc(hdr->frame_control)) {
453 		/* Don't use a regular queue for null packet (no ampdu) */
454 		bd->queue_id = WCN36XX_TX_U_WQ_ID;
455 		bd->bd_rate = WCN36XX_BD_RATE_CTRL;
456 		if (ieee80211_is_qos_nullfunc(hdr->frame_control))
457 			bd->pdu.bd_ssn = WCN36XX_TXBD_SSN_FILL_HOST;
458 	}
459 
460 	if (bcast) {
461 		bd->ub = 1;
462 		bd->ack_policy = 1;
463 	}
464 	*vif_priv = __vif_priv;
465 
466 	wcn36xx_set_tx_pdu(bd,
467 			   is_data_qos ?
468 			   sizeof(struct ieee80211_qos_hdr) :
469 			   sizeof(struct ieee80211_hdr_3addr),
470 			   skb->len, tid);
471 
472 	if (sta_priv && is_data_qos)
473 		wcn36xx_tx_start_ampdu(wcn, sta_priv, skb);
474 }
475 
wcn36xx_set_tx_mgmt(struct wcn36xx_tx_bd * bd,struct wcn36xx * wcn,struct wcn36xx_vif ** vif_priv,struct sk_buff * skb,bool bcast)476 static void wcn36xx_set_tx_mgmt(struct wcn36xx_tx_bd *bd,
477 				struct wcn36xx *wcn,
478 				struct wcn36xx_vif **vif_priv,
479 				struct sk_buff *skb,
480 				bool bcast)
481 {
482 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
483 	struct wcn36xx_vif *__vif_priv =
484 		get_vif_by_addr(wcn, hdr->addr2);
485 	bd->sta_index = __vif_priv->self_sta_index;
486 	bd->dpu_desc_idx = __vif_priv->self_dpu_desc_index;
487 	bd->dpu_ne = 1;
488 
489 	/* default rate for unicast */
490 	if (ieee80211_is_mgmt(hdr->frame_control))
491 		bd->bd_rate = (WCN36XX_BAND(wcn) == NL80211_BAND_5GHZ) ?
492 			WCN36XX_BD_RATE_CTRL :
493 			WCN36XX_BD_RATE_MGMT;
494 	else if (ieee80211_is_ctl(hdr->frame_control))
495 		bd->bd_rate = WCN36XX_BD_RATE_CTRL;
496 	else
497 		wcn36xx_warn("frame control type unknown\n");
498 
499 	/*
500 	 * In joining state trick hardware that probe is sent as
501 	 * unicast even if address is broadcast.
502 	 */
503 	if (__vif_priv->is_joining &&
504 	    ieee80211_is_probe_req(hdr->frame_control))
505 		bcast = false;
506 
507 	if (bcast) {
508 		/* broadcast */
509 		bd->ub = 1;
510 		/* No ack needed not unicast */
511 		bd->ack_policy = 1;
512 		bd->queue_id = WCN36XX_TX_B_WQ_ID;
513 	} else
514 		bd->queue_id = WCN36XX_TX_U_WQ_ID;
515 	*vif_priv = __vif_priv;
516 
517 	bd->pdu.bd_ssn = WCN36XX_TXBD_SSN_FILL_DPU_NON_QOS;
518 
519 	wcn36xx_set_tx_pdu(bd,
520 			   ieee80211_is_data_qos(hdr->frame_control) ?
521 			   sizeof(struct ieee80211_qos_hdr) :
522 			   sizeof(struct ieee80211_hdr_3addr),
523 			   skb->len, WCN36XX_TID);
524 }
525 
wcn36xx_start_tx(struct wcn36xx * wcn,struct wcn36xx_sta * sta_priv,struct sk_buff * skb)526 int wcn36xx_start_tx(struct wcn36xx *wcn,
527 		     struct wcn36xx_sta *sta_priv,
528 		     struct sk_buff *skb)
529 {
530 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
531 	struct wcn36xx_vif *vif_priv = NULL;
532 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
533 	bool is_low = ieee80211_is_data(hdr->frame_control);
534 	bool bcast = is_broadcast_ether_addr(hdr->addr1) ||
535 		is_multicast_ether_addr(hdr->addr1);
536 	bool ack_ind = (info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS) &&
537 					!(info->flags & IEEE80211_TX_CTL_NO_ACK);
538 	struct wcn36xx_tx_bd bd;
539 	int ret;
540 
541 	memset(&bd, 0, sizeof(bd));
542 
543 	wcn36xx_dbg(WCN36XX_DBG_TX,
544 		    "tx skb %p len %d fc %04x sn %d %s %s\n",
545 		    skb, skb->len, __le16_to_cpu(hdr->frame_control),
546 		    IEEE80211_SEQ_TO_SN(__le16_to_cpu(hdr->seq_ctrl)),
547 		    is_low ? "low" : "high", bcast ? "bcast" : "ucast");
548 
549 	wcn36xx_dbg_dump(WCN36XX_DBG_TX_DUMP, "", skb->data, skb->len);
550 
551 	bd.dpu_rf = WCN36XX_BMU_WQ_TX;
552 
553 	if (unlikely(ack_ind)) {
554 		wcn36xx_dbg(WCN36XX_DBG_DXE, "TX_ACK status requested\n");
555 
556 		/* Only one at a time is supported by fw. Stop the TX queues
557 		 * until the ack status gets back.
558 		 */
559 		ieee80211_stop_queues(wcn->hw);
560 
561 		/* Request ack indication from the firmware */
562 		bd.tx_comp = 1;
563 	}
564 
565 	/* Data frames served first*/
566 	if (is_low)
567 		wcn36xx_set_tx_data(&bd, wcn, &vif_priv, sta_priv, skb, bcast);
568 	else
569 		/* MGMT and CTRL frames are handeld here*/
570 		wcn36xx_set_tx_mgmt(&bd, wcn, &vif_priv, skb, bcast);
571 
572 	buff_to_be((u32 *)&bd, sizeof(bd)/sizeof(u32));
573 	bd.tx_bd_sign = 0xbdbdbdbd;
574 
575 	ret = wcn36xx_dxe_tx_frame(wcn, vif_priv, &bd, skb, is_low);
576 	if (unlikely(ret && ack_ind)) {
577 		/* If the skb has not been transmitted, resume TX queue */
578 		ieee80211_wake_queues(wcn->hw);
579 	}
580 
581 	return ret;
582 }
583