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
wcn36xx_rx_skb(struct wcn36xx * wcn,struct sk_buff * skb)26 int 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 status.mactime = 10;
49 status.freq = WCN36XX_CENTER_FREQ(wcn);
50 status.band = WCN36XX_BAND(wcn);
51 status.signal = -get_rssi0(bd);
52 status.antenna = 1;
53 status.rate_idx = 1;
54 status.flag = 0;
55 status.rx_flags = 0;
56 status.flag |= RX_FLAG_IV_STRIPPED |
57 RX_FLAG_MMIC_STRIPPED |
58 RX_FLAG_DECRYPTED;
59
60 wcn36xx_dbg(WCN36XX_DBG_RX, "status.flags=%llx\n", status.flag);
61
62 memcpy(IEEE80211_SKB_RXCB(skb), &status, sizeof(status));
63
64 hdr = (struct ieee80211_hdr *) skb->data;
65 fc = __le16_to_cpu(hdr->frame_control);
66 sn = IEEE80211_SEQ_TO_SN(__le16_to_cpu(hdr->seq_ctrl));
67
68 if (ieee80211_is_beacon(hdr->frame_control)) {
69 wcn36xx_dbg(WCN36XX_DBG_BEACON, "beacon skb %p len %d fc %04x sn %d\n",
70 skb, skb->len, fc, sn);
71 wcn36xx_dbg_dump(WCN36XX_DBG_BEACON_DUMP, "SKB <<< ",
72 (char *)skb->data, skb->len);
73 } else {
74 wcn36xx_dbg(WCN36XX_DBG_RX, "rx skb %p len %d fc %04x sn %d\n",
75 skb, skb->len, fc, sn);
76 wcn36xx_dbg_dump(WCN36XX_DBG_RX_DUMP, "SKB <<< ",
77 (char *)skb->data, skb->len);
78 }
79
80 ieee80211_rx_irqsafe(wcn->hw, skb);
81
82 return 0;
83 }
84
wcn36xx_set_tx_pdu(struct wcn36xx_tx_bd * bd,u32 mpdu_header_len,u32 len,u16 tid)85 static void wcn36xx_set_tx_pdu(struct wcn36xx_tx_bd *bd,
86 u32 mpdu_header_len,
87 u32 len,
88 u16 tid)
89 {
90 bd->pdu.mpdu_header_len = mpdu_header_len;
91 bd->pdu.mpdu_header_off = sizeof(*bd);
92 bd->pdu.mpdu_data_off = bd->pdu.mpdu_header_len +
93 bd->pdu.mpdu_header_off;
94 bd->pdu.mpdu_len = len;
95 bd->pdu.tid = tid;
96 bd->pdu.bd_ssn = WCN36XX_TXBD_SSN_FILL_DPU_QOS;
97 }
98
get_vif_by_addr(struct wcn36xx * wcn,u8 * addr)99 static inline struct wcn36xx_vif *get_vif_by_addr(struct wcn36xx *wcn,
100 u8 *addr)
101 {
102 struct wcn36xx_vif *vif_priv = NULL;
103 struct ieee80211_vif *vif = NULL;
104 list_for_each_entry(vif_priv, &wcn->vif_list, list) {
105 vif = wcn36xx_priv_to_vif(vif_priv);
106 if (memcmp(vif->addr, addr, ETH_ALEN) == 0)
107 return vif_priv;
108 }
109 wcn36xx_warn("vif %pM not found\n", addr);
110 return NULL;
111 }
112
wcn36xx_tx_start_ampdu(struct wcn36xx * wcn,struct wcn36xx_sta * sta_priv,struct sk_buff * skb)113 static void wcn36xx_tx_start_ampdu(struct wcn36xx *wcn,
114 struct wcn36xx_sta *sta_priv,
115 struct sk_buff *skb)
116 {
117 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
118 struct ieee80211_sta *sta;
119 u8 *qc, tid;
120
121 if (!conf_is_ht(&wcn->hw->conf))
122 return;
123
124 sta = wcn36xx_priv_to_sta(sta_priv);
125
126 if (WARN_ON(!ieee80211_is_data_qos(hdr->frame_control)))
127 return;
128
129 if (skb_get_queue_mapping(skb) == IEEE80211_AC_VO)
130 return;
131
132 qc = ieee80211_get_qos_ctl(hdr);
133 tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
134
135 spin_lock(&sta_priv->ampdu_lock);
136 if (sta_priv->ampdu_state[tid] != WCN36XX_AMPDU_NONE)
137 goto out_unlock;
138
139 if (sta_priv->non_agg_frame_ct++ >= WCN36XX_AMPDU_START_THRESH) {
140 sta_priv->ampdu_state[tid] = WCN36XX_AMPDU_START;
141 sta_priv->non_agg_frame_ct = 0;
142 ieee80211_start_tx_ba_session(sta, tid, 0);
143 }
144 out_unlock:
145 spin_unlock(&sta_priv->ampdu_lock);
146 }
147
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)148 static void wcn36xx_set_tx_data(struct wcn36xx_tx_bd *bd,
149 struct wcn36xx *wcn,
150 struct wcn36xx_vif **vif_priv,
151 struct wcn36xx_sta *sta_priv,
152 struct sk_buff *skb,
153 bool bcast)
154 {
155 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
156 struct ieee80211_vif *vif = NULL;
157 struct wcn36xx_vif *__vif_priv = NULL;
158 bool is_data_qos;
159
160 bd->bd_rate = WCN36XX_BD_RATE_DATA;
161
162 /*
163 * For not unicast frames mac80211 will not set sta pointer so use
164 * self_sta_index instead.
165 */
166 if (sta_priv) {
167 __vif_priv = sta_priv->vif;
168 vif = wcn36xx_priv_to_vif(__vif_priv);
169
170 bd->dpu_sign = sta_priv->ucast_dpu_sign;
171 if (vif->type == NL80211_IFTYPE_STATION) {
172 bd->sta_index = sta_priv->bss_sta_index;
173 bd->dpu_desc_idx = sta_priv->bss_dpu_desc_index;
174 } else if (vif->type == NL80211_IFTYPE_AP ||
175 vif->type == NL80211_IFTYPE_ADHOC ||
176 vif->type == NL80211_IFTYPE_MESH_POINT) {
177 bd->sta_index = sta_priv->sta_index;
178 bd->dpu_desc_idx = sta_priv->dpu_desc_index;
179 }
180 } else {
181 __vif_priv = get_vif_by_addr(wcn, hdr->addr2);
182 bd->sta_index = __vif_priv->self_sta_index;
183 bd->dpu_desc_idx = __vif_priv->self_dpu_desc_index;
184 bd->dpu_sign = __vif_priv->self_ucast_dpu_sign;
185 }
186
187 if (ieee80211_is_nullfunc(hdr->frame_control) ||
188 (sta_priv && !sta_priv->is_data_encrypted))
189 bd->dpu_ne = 1;
190
191 if (bcast) {
192 bd->ub = 1;
193 bd->ack_policy = 1;
194 }
195 *vif_priv = __vif_priv;
196
197 is_data_qos = ieee80211_is_data_qos(hdr->frame_control);
198
199 wcn36xx_set_tx_pdu(bd,
200 is_data_qos ?
201 sizeof(struct ieee80211_qos_hdr) :
202 sizeof(struct ieee80211_hdr_3addr),
203 skb->len, sta_priv ? sta_priv->tid : 0);
204
205 if (sta_priv && is_data_qos)
206 wcn36xx_tx_start_ampdu(wcn, sta_priv, skb);
207 }
208
wcn36xx_set_tx_mgmt(struct wcn36xx_tx_bd * bd,struct wcn36xx * wcn,struct wcn36xx_vif ** vif_priv,struct sk_buff * skb,bool bcast)209 static void wcn36xx_set_tx_mgmt(struct wcn36xx_tx_bd *bd,
210 struct wcn36xx *wcn,
211 struct wcn36xx_vif **vif_priv,
212 struct sk_buff *skb,
213 bool bcast)
214 {
215 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
216 struct wcn36xx_vif *__vif_priv =
217 get_vif_by_addr(wcn, hdr->addr2);
218 bd->sta_index = __vif_priv->self_sta_index;
219 bd->dpu_desc_idx = __vif_priv->self_dpu_desc_index;
220 bd->dpu_ne = 1;
221
222 /* default rate for unicast */
223 if (ieee80211_is_mgmt(hdr->frame_control))
224 bd->bd_rate = (WCN36XX_BAND(wcn) == NL80211_BAND_5GHZ) ?
225 WCN36XX_BD_RATE_CTRL :
226 WCN36XX_BD_RATE_MGMT;
227 else if (ieee80211_is_ctl(hdr->frame_control))
228 bd->bd_rate = WCN36XX_BD_RATE_CTRL;
229 else
230 wcn36xx_warn("frame control type unknown\n");
231
232 /*
233 * In joining state trick hardware that probe is sent as
234 * unicast even if address is broadcast.
235 */
236 if (__vif_priv->is_joining &&
237 ieee80211_is_probe_req(hdr->frame_control))
238 bcast = false;
239
240 if (bcast) {
241 /* broadcast */
242 bd->ub = 1;
243 /* No ack needed not unicast */
244 bd->ack_policy = 1;
245 bd->queue_id = WCN36XX_TX_B_WQ_ID;
246 } else
247 bd->queue_id = WCN36XX_TX_U_WQ_ID;
248 *vif_priv = __vif_priv;
249
250 wcn36xx_set_tx_pdu(bd,
251 ieee80211_is_data_qos(hdr->frame_control) ?
252 sizeof(struct ieee80211_qos_hdr) :
253 sizeof(struct ieee80211_hdr_3addr),
254 skb->len, WCN36XX_TID);
255 }
256
wcn36xx_start_tx(struct wcn36xx * wcn,struct wcn36xx_sta * sta_priv,struct sk_buff * skb)257 int wcn36xx_start_tx(struct wcn36xx *wcn,
258 struct wcn36xx_sta *sta_priv,
259 struct sk_buff *skb)
260 {
261 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
262 struct wcn36xx_vif *vif_priv = NULL;
263 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
264 unsigned long flags;
265 bool is_low = ieee80211_is_data(hdr->frame_control);
266 bool bcast = is_broadcast_ether_addr(hdr->addr1) ||
267 is_multicast_ether_addr(hdr->addr1);
268 struct wcn36xx_tx_bd *bd = wcn36xx_dxe_get_next_bd(wcn, is_low);
269
270 if (!bd) {
271 /*
272 * TX DXE are used in pairs. One for the BD and one for the
273 * actual frame. The BD DXE's has a preallocated buffer while
274 * the skb ones does not. If this isn't true something is really
275 * wierd. TODO: Recover from this situation
276 */
277
278 wcn36xx_err("bd address may not be NULL for BD DXE\n");
279 return -EINVAL;
280 }
281
282 memset(bd, 0, sizeof(*bd));
283
284 wcn36xx_dbg(WCN36XX_DBG_TX,
285 "tx skb %p len %d fc %04x sn %d %s %s\n",
286 skb, skb->len, __le16_to_cpu(hdr->frame_control),
287 IEEE80211_SEQ_TO_SN(__le16_to_cpu(hdr->seq_ctrl)),
288 is_low ? "low" : "high", bcast ? "bcast" : "ucast");
289
290 wcn36xx_dbg_dump(WCN36XX_DBG_TX_DUMP, "", skb->data, skb->len);
291
292 bd->dpu_rf = WCN36XX_BMU_WQ_TX;
293
294 bd->tx_comp = !!(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS);
295 if (bd->tx_comp) {
296 wcn36xx_dbg(WCN36XX_DBG_DXE, "TX_ACK status requested\n");
297 spin_lock_irqsave(&wcn->dxe_lock, flags);
298 if (wcn->tx_ack_skb) {
299 spin_unlock_irqrestore(&wcn->dxe_lock, flags);
300 wcn36xx_warn("tx_ack_skb already set\n");
301 return -EINVAL;
302 }
303
304 wcn->tx_ack_skb = skb;
305 spin_unlock_irqrestore(&wcn->dxe_lock, flags);
306
307 /* Only one at a time is supported by fw. Stop the TX queues
308 * until the ack status gets back.
309 *
310 * TODO: Add watchdog in case FW does not answer
311 */
312 ieee80211_stop_queues(wcn->hw);
313 }
314
315 /* Data frames served first*/
316 if (is_low)
317 wcn36xx_set_tx_data(bd, wcn, &vif_priv, sta_priv, skb, bcast);
318 else
319 /* MGMT and CTRL frames are handeld here*/
320 wcn36xx_set_tx_mgmt(bd, wcn, &vif_priv, skb, bcast);
321
322 buff_to_be((u32 *)bd, sizeof(*bd)/sizeof(u32));
323 bd->tx_bd_sign = 0xbdbdbdbd;
324
325 return wcn36xx_dxe_tx_frame(wcn, vif_priv, skb, is_low);
326 }
327