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 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=%x\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 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 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 = container_of((void *)vif_priv, 106 struct ieee80211_vif, 107 drv_priv); 108 if (memcmp(vif->addr, addr, ETH_ALEN) == 0) 109 return vif_priv; 110 } 111 wcn36xx_warn("vif %pM not found\n", addr); 112 return NULL; 113 } 114 115 static void wcn36xx_tx_start_ampdu(struct wcn36xx *wcn, 116 struct wcn36xx_sta *sta_priv, 117 struct sk_buff *skb) 118 { 119 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 120 struct ieee80211_sta *sta; 121 u8 *qc, tid; 122 123 if (!conf_is_ht(&wcn->hw->conf)) 124 return; 125 126 sta = wcn36xx_priv_to_sta(sta_priv); 127 128 if (WARN_ON(!ieee80211_is_data_qos(hdr->frame_control))) 129 return; 130 131 if (skb_get_queue_mapping(skb) == IEEE80211_AC_VO) 132 return; 133 134 qc = ieee80211_get_qos_ctl(hdr); 135 tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK; 136 137 spin_lock(&sta_priv->ampdu_lock); 138 if (sta_priv->ampdu_state[tid] != WCN36XX_AMPDU_NONE) 139 goto out_unlock; 140 141 if (sta_priv->non_agg_frame_ct++ >= WCN36XX_AMPDU_START_THRESH) { 142 sta_priv->ampdu_state[tid] = WCN36XX_AMPDU_START; 143 sta_priv->non_agg_frame_ct = 0; 144 ieee80211_start_tx_ba_session(sta, tid, 0); 145 } 146 out_unlock: 147 spin_unlock(&sta_priv->ampdu_lock); 148 } 149 150 static void wcn36xx_set_tx_data(struct wcn36xx_tx_bd *bd, 151 struct wcn36xx *wcn, 152 struct wcn36xx_vif **vif_priv, 153 struct wcn36xx_sta *sta_priv, 154 struct sk_buff *skb, 155 bool bcast) 156 { 157 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 158 struct ieee80211_vif *vif = NULL; 159 struct wcn36xx_vif *__vif_priv = NULL; 160 bool is_data_qos; 161 162 bd->bd_rate = WCN36XX_BD_RATE_DATA; 163 164 /* 165 * For not unicast frames mac80211 will not set sta pointer so use 166 * self_sta_index instead. 167 */ 168 if (sta_priv) { 169 __vif_priv = sta_priv->vif; 170 vif = container_of((void *)__vif_priv, 171 struct ieee80211_vif, 172 drv_priv); 173 174 bd->dpu_sign = sta_priv->ucast_dpu_sign; 175 if (vif->type == NL80211_IFTYPE_STATION) { 176 bd->sta_index = sta_priv->bss_sta_index; 177 bd->dpu_desc_idx = sta_priv->bss_dpu_desc_index; 178 } else if (vif->type == NL80211_IFTYPE_AP || 179 vif->type == NL80211_IFTYPE_ADHOC || 180 vif->type == NL80211_IFTYPE_MESH_POINT) { 181 bd->sta_index = sta_priv->sta_index; 182 bd->dpu_desc_idx = sta_priv->dpu_desc_index; 183 } 184 } else { 185 __vif_priv = get_vif_by_addr(wcn, hdr->addr2); 186 bd->sta_index = __vif_priv->self_sta_index; 187 bd->dpu_desc_idx = __vif_priv->self_dpu_desc_index; 188 bd->dpu_sign = __vif_priv->self_ucast_dpu_sign; 189 } 190 191 if (ieee80211_is_nullfunc(hdr->frame_control) || 192 (sta_priv && !sta_priv->is_data_encrypted)) 193 bd->dpu_ne = 1; 194 195 if (bcast) { 196 bd->ub = 1; 197 bd->ack_policy = 1; 198 } 199 *vif_priv = __vif_priv; 200 201 is_data_qos = ieee80211_is_data_qos(hdr->frame_control); 202 203 wcn36xx_set_tx_pdu(bd, 204 is_data_qos ? 205 sizeof(struct ieee80211_qos_hdr) : 206 sizeof(struct ieee80211_hdr_3addr), 207 skb->len, sta_priv ? sta_priv->tid : 0); 208 209 if (sta_priv && is_data_qos) 210 wcn36xx_tx_start_ampdu(wcn, sta_priv, skb); 211 } 212 213 static void wcn36xx_set_tx_mgmt(struct wcn36xx_tx_bd *bd, 214 struct wcn36xx *wcn, 215 struct wcn36xx_vif **vif_priv, 216 struct sk_buff *skb, 217 bool bcast) 218 { 219 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 220 struct wcn36xx_vif *__vif_priv = 221 get_vif_by_addr(wcn, hdr->addr2); 222 bd->sta_index = __vif_priv->self_sta_index; 223 bd->dpu_desc_idx = __vif_priv->self_dpu_desc_index; 224 bd->dpu_ne = 1; 225 226 /* default rate for unicast */ 227 if (ieee80211_is_mgmt(hdr->frame_control)) 228 bd->bd_rate = (WCN36XX_BAND(wcn) == IEEE80211_BAND_5GHZ) ? 229 WCN36XX_BD_RATE_CTRL : 230 WCN36XX_BD_RATE_MGMT; 231 else if (ieee80211_is_ctl(hdr->frame_control)) 232 bd->bd_rate = WCN36XX_BD_RATE_CTRL; 233 else 234 wcn36xx_warn("frame control type unknown\n"); 235 236 /* 237 * In joining state trick hardware that probe is sent as 238 * unicast even if address is broadcast. 239 */ 240 if (__vif_priv->is_joining && 241 ieee80211_is_probe_req(hdr->frame_control)) 242 bcast = false; 243 244 if (bcast) { 245 /* broadcast */ 246 bd->ub = 1; 247 /* No ack needed not unicast */ 248 bd->ack_policy = 1; 249 bd->queue_id = WCN36XX_TX_B_WQ_ID; 250 } else 251 bd->queue_id = WCN36XX_TX_U_WQ_ID; 252 *vif_priv = __vif_priv; 253 254 wcn36xx_set_tx_pdu(bd, 255 ieee80211_is_data_qos(hdr->frame_control) ? 256 sizeof(struct ieee80211_qos_hdr) : 257 sizeof(struct ieee80211_hdr_3addr), 258 skb->len, WCN36XX_TID); 259 } 260 261 int wcn36xx_start_tx(struct wcn36xx *wcn, 262 struct wcn36xx_sta *sta_priv, 263 struct sk_buff *skb) 264 { 265 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 266 struct wcn36xx_vif *vif_priv = NULL; 267 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 268 unsigned long flags; 269 bool is_low = ieee80211_is_data(hdr->frame_control); 270 bool bcast = is_broadcast_ether_addr(hdr->addr1) || 271 is_multicast_ether_addr(hdr->addr1); 272 struct wcn36xx_tx_bd *bd = wcn36xx_dxe_get_next_bd(wcn, is_low); 273 274 if (!bd) { 275 /* 276 * TX DXE are used in pairs. One for the BD and one for the 277 * actual frame. The BD DXE's has a preallocated buffer while 278 * the skb ones does not. If this isn't true something is really 279 * wierd. TODO: Recover from this situation 280 */ 281 282 wcn36xx_err("bd address may not be NULL for BD DXE\n"); 283 return -EINVAL; 284 } 285 286 memset(bd, 0, sizeof(*bd)); 287 288 wcn36xx_dbg(WCN36XX_DBG_TX, 289 "tx skb %p len %d fc %04x sn %d %s %s\n", 290 skb, skb->len, __le16_to_cpu(hdr->frame_control), 291 IEEE80211_SEQ_TO_SN(__le16_to_cpu(hdr->seq_ctrl)), 292 is_low ? "low" : "high", bcast ? "bcast" : "ucast"); 293 294 wcn36xx_dbg_dump(WCN36XX_DBG_TX_DUMP, "", skb->data, skb->len); 295 296 bd->dpu_rf = WCN36XX_BMU_WQ_TX; 297 298 bd->tx_comp = !!(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS); 299 if (bd->tx_comp) { 300 wcn36xx_dbg(WCN36XX_DBG_DXE, "TX_ACK status requested\n"); 301 spin_lock_irqsave(&wcn->dxe_lock, flags); 302 if (wcn->tx_ack_skb) { 303 spin_unlock_irqrestore(&wcn->dxe_lock, flags); 304 wcn36xx_warn("tx_ack_skb already set\n"); 305 return -EINVAL; 306 } 307 308 wcn->tx_ack_skb = skb; 309 spin_unlock_irqrestore(&wcn->dxe_lock, flags); 310 311 /* Only one at a time is supported by fw. Stop the TX queues 312 * until the ack status gets back. 313 * 314 * TODO: Add watchdog in case FW does not answer 315 */ 316 ieee80211_stop_queues(wcn->hw); 317 } 318 319 /* Data frames served first*/ 320 if (is_low) 321 wcn36xx_set_tx_data(bd, wcn, &vif_priv, sta_priv, skb, bcast); 322 else 323 /* MGMT and CTRL frames are handeld here*/ 324 wcn36xx_set_tx_mgmt(bd, wcn, &vif_priv, skb, bcast); 325 326 buff_to_be((u32 *)bd, sizeof(*bd)/sizeof(u32)); 327 bd->tx_bd_sign = 0xbdbdbdbd; 328 329 return wcn36xx_dxe_tx_frame(wcn, vif_priv, skb, is_low); 330 } 331