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 21 static inline int get_rssi0(struct wcn36xx_rx_bd *bd) 22 { 23 return 100 - ((bd->phy_stat0 >> 24) & 0xff); 24 } 25 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 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 92 static 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 } 105 106 static 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 } 119 120 static 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 } 151 out_unlock: 152 spin_unlock(&sta_priv->ampdu_lock); 153 } 154 155 static 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 } 215 216 static 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 } 263 264 int 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 } 335