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         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=%llx\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) == NL80211_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 }