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 } 97 98 static inline struct wcn36xx_vif *get_vif_by_addr(struct wcn36xx *wcn, 99 u8 *addr) 100 { 101 struct wcn36xx_vif *vif_priv = NULL; 102 struct ieee80211_vif *vif = NULL; 103 list_for_each_entry(vif_priv, &wcn->vif_list, list) { 104 vif = container_of((void *)vif_priv, 105 struct ieee80211_vif, 106 drv_priv); 107 if (memcmp(vif->addr, addr, ETH_ALEN) == 0) 108 return vif_priv; 109 } 110 wcn36xx_warn("vif %pM not found\n", addr); 111 return NULL; 112 } 113 static void wcn36xx_set_tx_data(struct wcn36xx_tx_bd *bd, 114 struct wcn36xx *wcn, 115 struct wcn36xx_vif **vif_priv, 116 struct wcn36xx_sta *sta_priv, 117 struct ieee80211_hdr *hdr, 118 bool bcast) 119 { 120 struct ieee80211_vif *vif = NULL; 121 struct wcn36xx_vif *__vif_priv = NULL; 122 bd->bd_rate = WCN36XX_BD_RATE_DATA; 123 124 /* 125 * For not unicast frames mac80211 will not set sta pointer so use 126 * self_sta_index instead. 127 */ 128 if (sta_priv) { 129 __vif_priv = sta_priv->vif; 130 vif = container_of((void *)__vif_priv, 131 struct ieee80211_vif, 132 drv_priv); 133 134 bd->dpu_sign = sta_priv->ucast_dpu_sign; 135 if (vif->type == NL80211_IFTYPE_STATION) { 136 bd->sta_index = sta_priv->bss_sta_index; 137 bd->dpu_desc_idx = sta_priv->bss_dpu_desc_index; 138 } else if (vif->type == NL80211_IFTYPE_AP || 139 vif->type == NL80211_IFTYPE_ADHOC || 140 vif->type == NL80211_IFTYPE_MESH_POINT) { 141 bd->sta_index = sta_priv->sta_index; 142 bd->dpu_desc_idx = sta_priv->dpu_desc_index; 143 } 144 } else { 145 __vif_priv = get_vif_by_addr(wcn, hdr->addr2); 146 bd->sta_index = __vif_priv->self_sta_index; 147 bd->dpu_desc_idx = __vif_priv->self_dpu_desc_index; 148 bd->dpu_sign = __vif_priv->self_ucast_dpu_sign; 149 } 150 151 if (ieee80211_is_nullfunc(hdr->frame_control) || 152 (sta_priv && !sta_priv->is_data_encrypted)) 153 bd->dpu_ne = 1; 154 155 if (bcast) { 156 bd->ub = 1; 157 bd->ack_policy = 1; 158 } 159 *vif_priv = __vif_priv; 160 } 161 162 static void wcn36xx_set_tx_mgmt(struct wcn36xx_tx_bd *bd, 163 struct wcn36xx *wcn, 164 struct wcn36xx_vif **vif_priv, 165 struct ieee80211_hdr *hdr, 166 bool bcast) 167 { 168 struct wcn36xx_vif *__vif_priv = 169 get_vif_by_addr(wcn, hdr->addr2); 170 bd->sta_index = __vif_priv->self_sta_index; 171 bd->dpu_desc_idx = __vif_priv->self_dpu_desc_index; 172 bd->dpu_ne = 1; 173 174 /* default rate for unicast */ 175 if (ieee80211_is_mgmt(hdr->frame_control)) 176 bd->bd_rate = (WCN36XX_BAND(wcn) == IEEE80211_BAND_5GHZ) ? 177 WCN36XX_BD_RATE_CTRL : 178 WCN36XX_BD_RATE_MGMT; 179 else if (ieee80211_is_ctl(hdr->frame_control)) 180 bd->bd_rate = WCN36XX_BD_RATE_CTRL; 181 else 182 wcn36xx_warn("frame control type unknown\n"); 183 184 /* 185 * In joining state trick hardware that probe is sent as 186 * unicast even if address is broadcast. 187 */ 188 if (__vif_priv->is_joining && 189 ieee80211_is_probe_req(hdr->frame_control)) 190 bcast = false; 191 192 if (bcast) { 193 /* broadcast */ 194 bd->ub = 1; 195 /* No ack needed not unicast */ 196 bd->ack_policy = 1; 197 bd->queue_id = WCN36XX_TX_B_WQ_ID; 198 } else 199 bd->queue_id = WCN36XX_TX_U_WQ_ID; 200 *vif_priv = __vif_priv; 201 } 202 203 int wcn36xx_start_tx(struct wcn36xx *wcn, 204 struct wcn36xx_sta *sta_priv, 205 struct sk_buff *skb) 206 { 207 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 208 struct wcn36xx_vif *vif_priv = NULL; 209 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 210 unsigned long flags; 211 bool is_low = ieee80211_is_data(hdr->frame_control); 212 bool bcast = is_broadcast_ether_addr(hdr->addr1) || 213 is_multicast_ether_addr(hdr->addr1); 214 struct wcn36xx_tx_bd *bd = wcn36xx_dxe_get_next_bd(wcn, is_low); 215 216 if (!bd) { 217 /* 218 * TX DXE are used in pairs. One for the BD and one for the 219 * actual frame. The BD DXE's has a preallocated buffer while 220 * the skb ones does not. If this isn't true something is really 221 * wierd. TODO: Recover from this situation 222 */ 223 224 wcn36xx_err("bd address may not be NULL for BD DXE\n"); 225 return -EINVAL; 226 } 227 228 memset(bd, 0, sizeof(*bd)); 229 230 wcn36xx_dbg(WCN36XX_DBG_TX, 231 "tx skb %p len %d fc %04x sn %d %s %s\n", 232 skb, skb->len, __le16_to_cpu(hdr->frame_control), 233 IEEE80211_SEQ_TO_SN(__le16_to_cpu(hdr->seq_ctrl)), 234 is_low ? "low" : "high", bcast ? "bcast" : "ucast"); 235 236 wcn36xx_dbg_dump(WCN36XX_DBG_TX_DUMP, "", skb->data, skb->len); 237 238 bd->dpu_rf = WCN36XX_BMU_WQ_TX; 239 240 bd->tx_comp = info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS; 241 if (bd->tx_comp) { 242 wcn36xx_dbg(WCN36XX_DBG_DXE, "TX_ACK status requested\n"); 243 spin_lock_irqsave(&wcn->dxe_lock, flags); 244 if (wcn->tx_ack_skb) { 245 spin_unlock_irqrestore(&wcn->dxe_lock, flags); 246 wcn36xx_warn("tx_ack_skb already set\n"); 247 return -EINVAL; 248 } 249 250 wcn->tx_ack_skb = skb; 251 spin_unlock_irqrestore(&wcn->dxe_lock, flags); 252 253 /* Only one at a time is supported by fw. Stop the TX queues 254 * until the ack status gets back. 255 * 256 * TODO: Add watchdog in case FW does not answer 257 */ 258 ieee80211_stop_queues(wcn->hw); 259 } 260 261 /* Data frames served first*/ 262 if (is_low) { 263 wcn36xx_set_tx_data(bd, wcn, &vif_priv, sta_priv, hdr, bcast); 264 wcn36xx_set_tx_pdu(bd, 265 ieee80211_is_data_qos(hdr->frame_control) ? 266 sizeof(struct ieee80211_qos_hdr) : 267 sizeof(struct ieee80211_hdr_3addr), 268 skb->len, sta_priv ? sta_priv->tid : 0); 269 } else { 270 /* MGMT and CTRL frames are handeld here*/ 271 wcn36xx_set_tx_mgmt(bd, wcn, &vif_priv, hdr, bcast); 272 wcn36xx_set_tx_pdu(bd, 273 ieee80211_is_data_qos(hdr->frame_control) ? 274 sizeof(struct ieee80211_qos_hdr) : 275 sizeof(struct ieee80211_hdr_3addr), 276 skb->len, WCN36XX_TID); 277 } 278 279 buff_to_be((u32 *)bd, sizeof(*bd)/sizeof(u32)); 280 bd->tx_bd_sign = 0xbdbdbdbd; 281 282 return wcn36xx_dxe_tx_frame(wcn, vif_priv, skb, is_low); 283 } 284