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        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
  85static 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
  99static 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
 115static 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        }
 146out_unlock:
 147        spin_unlock(&sta_priv->ampdu_lock);
 148}
 149
 150static 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
 213static 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) == IEEE80211_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
 261int 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}
 331