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 status->vendor_radiotap_len=%x\n", 61 status.flag, status.vendor_radiotap_len); 62 63 memcpy(IEEE80211_SKB_RXCB(skb), &status, sizeof(status)); 64 65 hdr = (struct ieee80211_hdr *) skb->data; 66 fc = __le16_to_cpu(hdr->frame_control); 67 sn = IEEE80211_SEQ_TO_SN(__le16_to_cpu(hdr->seq_ctrl)); 68 69 if (ieee80211_is_beacon(hdr->frame_control)) { 70 wcn36xx_dbg(WCN36XX_DBG_BEACON, "beacon skb %p len %d fc %04x sn %d\n", 71 skb, skb->len, fc, sn); 72 wcn36xx_dbg_dump(WCN36XX_DBG_BEACON_DUMP, "SKB <<< ", 73 (char *)skb->data, skb->len); 74 } else { 75 wcn36xx_dbg(WCN36XX_DBG_RX, "rx skb %p len %d fc %04x sn %d\n", 76 skb, skb->len, fc, sn); 77 wcn36xx_dbg_dump(WCN36XX_DBG_RX_DUMP, "SKB <<< ", 78 (char *)skb->data, skb->len); 79 } 80 81 ieee80211_rx_irqsafe(wcn->hw, skb); 82 83 return 0; 84 } 85 86 static void wcn36xx_set_tx_pdu(struct wcn36xx_tx_bd *bd, 87 u32 mpdu_header_len, 88 u32 len, 89 u16 tid) 90 { 91 bd->pdu.mpdu_header_len = mpdu_header_len; 92 bd->pdu.mpdu_header_off = sizeof(*bd); 93 bd->pdu.mpdu_data_off = bd->pdu.mpdu_header_len + 94 bd->pdu.mpdu_header_off; 95 bd->pdu.mpdu_len = len; 96 bd->pdu.tid = tid; 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 static void wcn36xx_set_tx_data(struct wcn36xx_tx_bd *bd, 115 struct wcn36xx *wcn, 116 struct wcn36xx_vif **vif_priv, 117 struct wcn36xx_sta *sta_priv, 118 struct ieee80211_hdr *hdr, 119 bool bcast) 120 { 121 struct ieee80211_vif *vif = NULL; 122 struct wcn36xx_vif *__vif_priv = NULL; 123 bd->bd_rate = WCN36XX_BD_RATE_DATA; 124 125 /* 126 * For not unicast frames mac80211 will not set sta pointer so use 127 * self_sta_index instead. 128 */ 129 if (sta_priv) { 130 __vif_priv = sta_priv->vif; 131 vif = container_of((void *)__vif_priv, 132 struct ieee80211_vif, 133 drv_priv); 134 135 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 } 149 150 bd->dpu_sign = __vif_priv->ucast_dpu_signature; 151 152 if (ieee80211_is_nullfunc(hdr->frame_control) || 153 (sta_priv && !sta_priv->is_data_encrypted)) 154 bd->dpu_ne = 1; 155 156 if (bcast) { 157 bd->ub = 1; 158 bd->ack_policy = 1; 159 } 160 *vif_priv = __vif_priv; 161 } 162 163 static void wcn36xx_set_tx_mgmt(struct wcn36xx_tx_bd *bd, 164 struct wcn36xx *wcn, 165 struct wcn36xx_vif **vif_priv, 166 struct ieee80211_hdr *hdr, 167 bool bcast) 168 { 169 struct wcn36xx_vif *__vif_priv = 170 get_vif_by_addr(wcn, hdr->addr2); 171 bd->sta_index = __vif_priv->self_sta_index; 172 bd->dpu_desc_idx = __vif_priv->self_dpu_desc_index; 173 bd->dpu_ne = 1; 174 175 /* default rate for unicast */ 176 if (ieee80211_is_mgmt(hdr->frame_control)) 177 bd->bd_rate = (WCN36XX_BAND(wcn) == IEEE80211_BAND_5GHZ) ? 178 WCN36XX_BD_RATE_CTRL : 179 WCN36XX_BD_RATE_MGMT; 180 else if (ieee80211_is_ctl(hdr->frame_control)) 181 bd->bd_rate = WCN36XX_BD_RATE_CTRL; 182 else 183 wcn36xx_warn("frame control type unknown\n"); 184 185 /* 186 * In joining state trick hardware that probe is sent as 187 * unicast even if address is broadcast. 188 */ 189 if (__vif_priv->is_joining && 190 ieee80211_is_probe_req(hdr->frame_control)) 191 bcast = false; 192 193 if (bcast) { 194 /* broadcast */ 195 bd->ub = 1; 196 /* No ack needed not unicast */ 197 bd->ack_policy = 1; 198 bd->queue_id = WCN36XX_TX_B_WQ_ID; 199 } else 200 bd->queue_id = WCN36XX_TX_U_WQ_ID; 201 *vif_priv = __vif_priv; 202 } 203 204 int wcn36xx_start_tx(struct wcn36xx *wcn, 205 struct wcn36xx_sta *sta_priv, 206 struct sk_buff *skb) 207 { 208 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 209 struct wcn36xx_vif *vif_priv = NULL; 210 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 211 unsigned long flags; 212 bool is_low = ieee80211_is_data(hdr->frame_control); 213 bool bcast = is_broadcast_ether_addr(hdr->addr1) || 214 is_multicast_ether_addr(hdr->addr1); 215 struct wcn36xx_tx_bd *bd = wcn36xx_dxe_get_next_bd(wcn, is_low); 216 217 if (!bd) { 218 /* 219 * TX DXE are used in pairs. One for the BD and one for the 220 * actual frame. The BD DXE's has a preallocated buffer while 221 * the skb ones does not. If this isn't true something is really 222 * wierd. TODO: Recover from this situation 223 */ 224 225 wcn36xx_err("bd address may not be NULL for BD DXE\n"); 226 return -EINVAL; 227 } 228 229 memset(bd, 0, sizeof(*bd)); 230 231 wcn36xx_dbg(WCN36XX_DBG_TX, 232 "tx skb %p len %d fc %04x sn %d %s %s\n", 233 skb, skb->len, __le16_to_cpu(hdr->frame_control), 234 IEEE80211_SEQ_TO_SN(__le16_to_cpu(hdr->seq_ctrl)), 235 is_low ? "low" : "high", bcast ? "bcast" : "ucast"); 236 237 wcn36xx_dbg_dump(WCN36XX_DBG_TX_DUMP, "", skb->data, skb->len); 238 239 bd->dpu_rf = WCN36XX_BMU_WQ_TX; 240 241 bd->tx_comp = info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS; 242 if (bd->tx_comp) { 243 wcn36xx_dbg(WCN36XX_DBG_DXE, "TX_ACK status requested\n"); 244 spin_lock_irqsave(&wcn->dxe_lock, flags); 245 if (wcn->tx_ack_skb) { 246 spin_unlock_irqrestore(&wcn->dxe_lock, flags); 247 wcn36xx_warn("tx_ack_skb already set\n"); 248 return -EINVAL; 249 } 250 251 wcn->tx_ack_skb = skb; 252 spin_unlock_irqrestore(&wcn->dxe_lock, flags); 253 254 /* Only one at a time is supported by fw. Stop the TX queues 255 * until the ack status gets back. 256 * 257 * TODO: Add watchdog in case FW does not answer 258 */ 259 ieee80211_stop_queues(wcn->hw); 260 } 261 262 /* Data frames served first*/ 263 if (is_low) { 264 wcn36xx_set_tx_data(bd, wcn, &vif_priv, sta_priv, hdr, bcast); 265 wcn36xx_set_tx_pdu(bd, 266 ieee80211_is_data_qos(hdr->frame_control) ? 267 sizeof(struct ieee80211_qos_hdr) : 268 sizeof(struct ieee80211_hdr_3addr), 269 skb->len, sta_priv ? sta_priv->tid : 0); 270 } else { 271 /* MGMT and CTRL frames are handeld here*/ 272 wcn36xx_set_tx_mgmt(bd, wcn, &vif_priv, hdr, bcast); 273 wcn36xx_set_tx_pdu(bd, 274 ieee80211_is_data_qos(hdr->frame_control) ? 275 sizeof(struct ieee80211_qos_hdr) : 276 sizeof(struct ieee80211_hdr_3addr), 277 skb->len, WCN36XX_TID); 278 } 279 280 buff_to_be((u32 *)bd, sizeof(*bd)/sizeof(u32)); 281 bd->tx_bd_sign = 0xbdbdbdbd; 282 283 return wcn36xx_dxe_tx_frame(wcn, vif_priv, skb, is_low); 284 } 285