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=%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 }