LXR linux/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
  21static inline int get_rssi0(struct wcn36xx_rx_bd *bd)
  22{
  23        return 100 - ((bd->phy_stat0 >> 24) & 0xff);
  24}
  25
  26int 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
  92static 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
 106static 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
 120static 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        }
 151out_unlock:
 152        spin_unlock(&sta_priv->ampdu_lock);
 153}
 154
 155static 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
 216static 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
 264int 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;
 276        int ret;
 277
 278        memset(&bd, 0, sizeof(bd));
 279
 280        wcn36xx_dbg(WCN36XX_DBG_TX,
 281                    "tx skb %p len %d fc %04x sn %d %s %s\n",
 282                    skb, skb->len, __le16_to_cpu(hdr->frame_control),
 283                    IEEE80211_SEQ_TO_SN(__le16_to_cpu(hdr->seq_ctrl)),
 284                    is_low ? "low" : "high", bcast ? "bcast" : "ucast");
 285
 286        wcn36xx_dbg_dump(WCN36XX_DBG_TX_DUMP, "", skb->data, skb->len);
 287
 288        bd.dpu_rf = WCN36XX_BMU_WQ_TX;
 289
 290        bd.tx_comp = !!(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS);
 291        if (bd.tx_comp) {
 292                wcn36xx_dbg(WCN36XX_DBG_DXE, "TX_ACK status requested\n");
 293                spin_lock_irqsave(&wcn->dxe_lock, flags);
 294                if (wcn->tx_ack_skb) {
 295                        spin_unlock_irqrestore(&wcn->dxe_lock, flags);
 296                        wcn36xx_warn("tx_ack_skb already set\n");
 297                        return -EINVAL;
 298                }
 299
 300                wcn->tx_ack_skb = skb;
 301                spin_unlock_irqrestore(&wcn->dxe_lock, flags);
 302
 303                /* Only one at a time is supported by fw. Stop the TX queues
 304                 * until the ack status gets back.
 305                 *
 306                 * TODO: Add watchdog in case FW does not answer
 307                 */
 308                ieee80211_stop_queues(wcn->hw);
 309        }
 310
 311        /* Data frames served first*/
 312        if (is_low)
 313                wcn36xx_set_tx_data(&bd, wcn, &vif_priv, sta_priv, skb, bcast);
 314        else
 315                /* MGMT and CTRL frames are handeld here*/
 316                wcn36xx_set_tx_mgmt(&bd, wcn, &vif_priv, skb, bcast);
 317
 318        buff_to_be((u32 *)&bd, sizeof(bd)/sizeof(u32));
 319        bd.tx_bd_sign = 0xbdbdbdbd;
 320
 321        ret = wcn36xx_dxe_tx_frame(wcn, vif_priv, &bd, skb, is_low);
 322        if (ret && bd.tx_comp) {
 323                /* If the skb has not been transmitted,
 324                 * don't keep a reference to it.
 325                 */
 326                spin_lock_irqsave(&wcn->dxe_lock, flags);
 327                wcn->tx_ack_skb = NULL;
 328                spin_unlock_irqrestore(&wcn->dxe_lock, flags);
 329
 330                ieee80211_wake_queues(wcn->hw);
 331        }
 332
 333        return ret;
 334}
 335