drivers/net/wireless/ath/wcn36xx/txrx.c

   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 = wcn36xx_dxe_get_next_bd(wcn, is_low);
 276
 277         if (!bd) {
 278                 /*
 279                  * TX DXE are used in pairs. One for the BD and one for the
 280                  * actual frame. The BD DXE's has a preallocated buffer while
 281                  * the skb ones does not. If this isn't true something is really
 282                  * wierd. TODO: Recover from this situation
 283                  */
 284
 285                 wcn36xx_err("bd address may not be NULL for BD DXE\n");
 286                 return -EINVAL;
 287         }
 288
 289         memset(bd, 0, sizeof(*bd));
 290
 291         wcn36xx_dbg(WCN36XX_DBG_TX,
 292                     "tx skb %p len %d fc %04x sn %d %s %s\n",
 293                     skb, skb->len, __le16_to_cpu(hdr->frame_control),
 294                     IEEE80211_SEQ_TO_SN(__le16_to_cpu(hdr->seq_ctrl)),
 295                     is_low ? "low" : "high", bcast ? "bcast" : "ucast");
 296
 297         wcn36xx_dbg_dump(WCN36XX_DBG_TX_DUMP, "", skb->data, skb->len);
 298
 299         bd->dpu_rf = WCN36XX_BMU_WQ_TX;
 300
 301         bd->tx_comp = !!(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS);
 302         if (bd->tx_comp) {
 303                 wcn36xx_dbg(WCN36XX_DBG_DXE, "TX_ACK status requested\n");
 304                 spin_lock_irqsave(&wcn->dxe_lock, flags);
 305                 if (wcn->tx_ack_skb) {
 306                         spin_unlock_irqrestore(&wcn->dxe_lock, flags);
 307                         wcn36xx_warn("tx_ack_skb already set\n");
 308                         return -EINVAL;
 309                 }
 310
 311                 wcn->tx_ack_skb = skb;
 312                 spin_unlock_irqrestore(&wcn->dxe_lock, flags);
 313
 314                 /* Only one at a time is supported by fw. Stop the TX queues
 315                  * until the ack status gets back.
 316                  *
 317                  * TODO: Add watchdog in case FW does not answer
 318                  */
 319                 ieee80211_stop_queues(wcn->hw);
 320         }
 321
 322         /* Data frames served first*/
 323         if (is_low)
 324                 wcn36xx_set_tx_data(bd, wcn, &vif_priv, sta_priv, skb, bcast);
 325         else
 326                 /* MGMT and CTRL frames are handeld here*/
 327                 wcn36xx_set_tx_mgmt(bd, wcn, &vif_priv, skb, bcast);
 328
 329         buff_to_be((u32 *)bd, sizeof(*bd)/sizeof(u32));
 330         bd->tx_bd_sign = 0xbdbdbdbd;
 331
 332         return wcn36xx_dxe_tx_frame(wcn, vif_priv, skb, is_low);
 333 }