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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
21static inline int get_rssi0(struct wcn36xx_rx_bd *bd)
22{
23 return 100 - ((bd->phy_stat0 >> 24) & 0xff);
24}
25
26int wcn36xx_rx_skb(struct wcn36xx *wcn, struct sk_buff *skb)
27{
28 struct ieee80211_rx_status status;
29 struct ieee80211_hdr *hdr;
30 struct wcn36xx_rx_bd *bd;
31 u16 fc, sn;
32
33 /*
34 * All fields must be 0, otherwise it can lead to
35 * unexpected consequences.
36 */
37 memset(&status, 0, sizeof(status));
38
39 bd = (struct wcn36xx_rx_bd *)skb->data;
40 buff_to_be((u32 *)bd, sizeof(*bd)/sizeof(u32));
41 wcn36xx_dbg_dump(WCN36XX_DBG_RX_DUMP,
42 "BD <<< ", (char *)bd,
43 sizeof(struct wcn36xx_rx_bd));
44
45 skb_put(skb, bd->pdu.mpdu_header_off + bd->pdu.mpdu_len);
46 skb_pull(skb, bd->pdu.mpdu_header_off);
47
48 hdr = (struct ieee80211_hdr *) skb->data;
49 fc = __le16_to_cpu(hdr->frame_control);
50 sn = IEEE80211_SEQ_TO_SN(__le16_to_cpu(hdr->seq_ctrl));
51
52 /* When scanning associate beacons to this */
53 if (ieee80211_is_beacon(hdr->frame_control) && wcn->scan_freq) {
54 status.freq = wcn->scan_freq;
55 status.band = wcn->scan_band;
56 } else {
57 status.freq = WCN36XX_CENTER_FREQ(wcn);
58 status.band = WCN36XX_BAND(wcn);
59 }
60
61 status.mactime = 10;
62 status.signal = -get_rssi0(bd);
63 status.antenna = 1;
64 status.rate_idx = 1;
65 status.flag = 0;
66 status.rx_flags = 0;
67 status.flag |= RX_FLAG_IV_STRIPPED |
68 RX_FLAG_MMIC_STRIPPED |
69 RX_FLAG_DECRYPTED;
70
71 wcn36xx_dbg(WCN36XX_DBG_RX, "status.flags=%x\n", status.flag);
72
73 memcpy(IEEE80211_SKB_RXCB(skb), &status, sizeof(status));
74
75 if (ieee80211_is_beacon(hdr->frame_control)) {
76 wcn36xx_dbg(WCN36XX_DBG_BEACON, "beacon skb %p len %d fc %04x sn %d\n",
77 skb, skb->len, fc, sn);
78 wcn36xx_dbg_dump(WCN36XX_DBG_BEACON_DUMP, "SKB <<< ",
79 (char *)skb->data, skb->len);
80 } else {
81 wcn36xx_dbg(WCN36XX_DBG_RX, "rx skb %p len %d fc %04x sn %d\n",
82 skb, skb->len, fc, sn);
83 wcn36xx_dbg_dump(WCN36XX_DBG_RX_DUMP, "SKB <<< ",
84 (char *)skb->data, skb->len);
85 }
86
87 ieee80211_rx_irqsafe(wcn->hw, skb);
88
89 return 0;
90}
91
92static void wcn36xx_set_tx_pdu(struct wcn36xx_tx_bd *bd,
93 u32 mpdu_header_len,
94 u32 len,
95 u16 tid)
96{
97 bd->pdu.mpdu_header_len = mpdu_header_len;
98 bd->pdu.mpdu_header_off = sizeof(*bd);
99 bd->pdu.mpdu_data_off = bd->pdu.mpdu_header_len +
100 bd->pdu.mpdu_header_off;
101 bd->pdu.mpdu_len = len;
102 bd->pdu.tid = tid;
103 bd->pdu.bd_ssn = WCN36XX_TXBD_SSN_FILL_DPU_QOS;
104}
105
106static inline struct wcn36xx_vif *get_vif_by_addr(struct wcn36xx *wcn,
107 u8 *addr)
108{
109 struct wcn36xx_vif *vif_priv = NULL;
110 struct ieee80211_vif *vif = NULL;
111 list_for_each_entry(vif_priv, &wcn->vif_list, list) {
112 vif = wcn36xx_priv_to_vif(vif_priv);
113 if (memcmp(vif->addr, addr, ETH_ALEN) == 0)
114 return vif_priv;
115 }
116 wcn36xx_warn("vif %pM not found\n", addr);
117 return NULL;
118}
119
120static void wcn36xx_tx_start_ampdu(struct wcn36xx *wcn,
121 struct wcn36xx_sta *sta_priv,
122 struct sk_buff *skb)
123{
124 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
125 struct ieee80211_sta *sta;
126 u8 *qc, tid;
127
128 if (!conf_is_ht(&wcn->hw->conf))
129 return;
130
131 sta = wcn36xx_priv_to_sta(sta_priv);
132
133 if (WARN_ON(!ieee80211_is_data_qos(hdr->frame_control)))
134 return;
135
136 if (skb_get_queue_mapping(skb) == IEEE80211_AC_VO)
137 return;
138
139 qc = ieee80211_get_qos_ctl(hdr);
140 tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
141
142 spin_lock(&sta_priv->ampdu_lock);
143 if (sta_priv->ampdu_state[tid] != WCN36XX_AMPDU_NONE)
144 goto out_unlock;
145
146 if (sta_priv->non_agg_frame_ct++ >= WCN36XX_AMPDU_START_THRESH) {
147 sta_priv->ampdu_state[tid] = WCN36XX_AMPDU_START;
148 sta_priv->non_agg_frame_ct = 0;
149 ieee80211_start_tx_ba_session(sta, tid, 0);
150 }
151out_unlock:
152 spin_unlock(&sta_priv->ampdu_lock);
153}
154
155static void wcn36xx_set_tx_data(struct wcn36xx_tx_bd *bd,
156 struct wcn36xx *wcn,
157 struct wcn36xx_vif **vif_priv,
158 struct wcn36xx_sta *sta_priv,
159 struct sk_buff *skb,
160 bool bcast)
161{
162 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
163 struct ieee80211_vif *vif = NULL;
164 struct wcn36xx_vif *__vif_priv = NULL;
165 bool is_data_qos;
166
167 bd->bd_rate = WCN36XX_BD_RATE_DATA;
168
169 /*
170 * For not unicast frames mac80211 will not set sta pointer so use
171 * self_sta_index instead.
172 */
173 if (sta_priv) {
174 __vif_priv = sta_priv->vif;
175 vif = wcn36xx_priv_to_vif(__vif_priv);
176
177 bd->dpu_sign = sta_priv->ucast_dpu_sign;
178 if (vif->type == NL80211_IFTYPE_STATION) {
179 bd->sta_index = sta_priv->bss_sta_index;
180 bd->dpu_desc_idx = sta_priv->bss_dpu_desc_index;
181 } else if (vif->type == NL80211_IFTYPE_AP ||
182 vif->type == NL80211_IFTYPE_ADHOC ||
183 vif->type == NL80211_IFTYPE_MESH_POINT) {
184 bd->sta_index = sta_priv->sta_index;
185 bd->dpu_desc_idx = sta_priv->dpu_desc_index;
186 }
187 } else {
188 __vif_priv = get_vif_by_addr(wcn, hdr->addr2);
189 bd->sta_index = __vif_priv->self_sta_index;
190 bd->dpu_desc_idx = __vif_priv->self_dpu_desc_index;
191 bd->dpu_sign = __vif_priv->self_ucast_dpu_sign;
192 }
193
194 if (ieee80211_is_nullfunc(hdr->frame_control) ||
195 (sta_priv && !sta_priv->is_data_encrypted))
196 bd->dpu_ne = 1;
197
198 if (bcast) {
199 bd->ub = 1;
200 bd->ack_policy = 1;
201 }
202 *vif_priv = __vif_priv;
203
204 is_data_qos = ieee80211_is_data_qos(hdr->frame_control);
205
206 wcn36xx_set_tx_pdu(bd,
207 is_data_qos ?
208 sizeof(struct ieee80211_qos_hdr) :
209 sizeof(struct ieee80211_hdr_3addr),
210 skb->len, sta_priv ? sta_priv->tid : 0);
211
212 if (sta_priv && is_data_qos)
213 wcn36xx_tx_start_ampdu(wcn, sta_priv, skb);
214}
215
216static void wcn36xx_set_tx_mgmt(struct wcn36xx_tx_bd *bd,
217 struct wcn36xx *wcn,
218 struct wcn36xx_vif **vif_priv,
219 struct sk_buff *skb,
220 bool bcast)
221{
222 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
223 struct wcn36xx_vif *__vif_priv =
224 get_vif_by_addr(wcn, hdr->addr2);
225 bd->sta_index = __vif_priv->self_sta_index;
226 bd->dpu_desc_idx = __vif_priv->self_dpu_desc_index;
227 bd->dpu_ne = 1;
228
229 /* default rate for unicast */
230 if (ieee80211_is_mgmt(hdr->frame_control))
231 bd->bd_rate = (WCN36XX_BAND(wcn) == NL80211_BAND_5GHZ) ?
232 WCN36XX_BD_RATE_CTRL :
233 WCN36XX_BD_RATE_MGMT;
234 else if (ieee80211_is_ctl(hdr->frame_control))
235 bd->bd_rate = WCN36XX_BD_RATE_CTRL;
236 else
237 wcn36xx_warn("frame control type unknown\n");
238
239 /*
240 * In joining state trick hardware that probe is sent as
241 * unicast even if address is broadcast.
242 */
243 if (__vif_priv->is_joining &&
244 ieee80211_is_probe_req(hdr->frame_control))
245 bcast = false;
246
247 if (bcast) {
248 /* broadcast */
249 bd->ub = 1;
250 /* No ack needed not unicast */
251 bd->ack_policy = 1;
252 bd->queue_id = WCN36XX_TX_B_WQ_ID;
253 } else
254 bd->queue_id = WCN36XX_TX_U_WQ_ID;
255 *vif_priv = __vif_priv;
256
257 wcn36xx_set_tx_pdu(bd,
258 ieee80211_is_data_qos(hdr->frame_control) ?
259 sizeof(struct ieee80211_qos_hdr) :
260 sizeof(struct ieee80211_hdr_3addr),
261 skb->len, WCN36XX_TID);
262}
263
264int wcn36xx_start_tx(struct wcn36xx *wcn,
265 struct wcn36xx_sta *sta_priv,
266 struct sk_buff *skb)
267{
268 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
269 struct wcn36xx_vif *vif_priv = NULL;
270 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
271 unsigned long flags;
272 bool is_low = ieee80211_is_data(hdr->frame_control);
273 bool bcast = is_broadcast_ether_addr(hdr->addr1) ||
274 is_multicast_ether_addr(hdr->addr1);
275 struct wcn36xx_tx_bd bd;
276 int ret;
277
278 memset(&bd, 0, sizeof(bd));
279
280 wcn36xx_dbg(WCN36XX_DBG_TX,
281 "tx skb %p len %d fc %04x sn %d %s %s\n",
282 skb, skb->len, __le16_to_cpu(hdr->frame_control),
283 IEEE80211_SEQ_TO_SN(__le16_to_cpu(hdr->seq_ctrl)),
284 is_low ? "low" : "high", bcast ? "bcast" : "ucast");
285
286 wcn36xx_dbg_dump(WCN36XX_DBG_TX_DUMP, "", skb->data, skb->len);
287
288 bd.dpu_rf = WCN36XX_BMU_WQ_TX;
289
290 bd.tx_comp = !!(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS);
291 if (bd.tx_comp) {
292 wcn36xx_dbg(WCN36XX_DBG_DXE, "TX_ACK status requested\n");
293 spin_lock_irqsave(&wcn->dxe_lock, flags);
294 if (wcn->tx_ack_skb) {
295 spin_unlock_irqrestore(&wcn->dxe_lock, flags);
296 wcn36xx_warn("tx_ack_skb already set\n");
297 return -EINVAL;
298 }
299
300 wcn->tx_ack_skb = skb;
301 spin_unlock_irqrestore(&wcn->dxe_lock, flags);
302
303 /* Only one at a time is supported by fw. Stop the TX queues
304 * until the ack status gets back.
305 *
306 * TODO: Add watchdog in case FW does not answer
307 */
308 ieee80211_stop_queues(wcn->hw);
309 }
310
311 /* Data frames served first*/
312 if (is_low)
313 wcn36xx_set_tx_data(&bd, wcn, &vif_priv, sta_priv, skb, bcast);
314 else
315 /* MGMT and CTRL frames are handeld here*/
316 wcn36xx_set_tx_mgmt(&bd, wcn, &vif_priv, skb, bcast);
317
318 buff_to_be((u32 *)&bd, sizeof(bd)/sizeof(u32));
319 bd.tx_bd_sign = 0xbdbdbdbd;
320
321 ret = wcn36xx_dxe_tx_frame(wcn, vif_priv, &bd, skb, is_low);
322 if (ret && bd.tx_comp) {
323 /* If the skb has not been transmitted,
324 * don't keep a reference to it.
325 */
326 spin_lock_irqsave(&wcn->dxe_lock, flags);
327 wcn->tx_ack_skb = NULL;
328 spin_unlock_irqrestore(&wcn->dxe_lock, flags);
329
330 ieee80211_wake_queues(wcn->hw);
331 }
332
333 return ret;
334}