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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * mac80211 glue code for mac80211 Prism54 drivers
0004  *
0005  * Copyright (c) 2006, Michael Wu <flamingice@sourmilk.net>
0006  * Copyright (c) 2007-2009, Christian Lamparter <chunkeey@web.de>
0007  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
0008  *
0009  * Based on:
0010  * - the islsm (softmac prism54) driver, which is:
0011  *   Copyright 2004-2006 Jean-Baptiste Note <jbnote@gmail.com>, et al.
0012  * - stlc45xx driver
0013  *   Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
0014  */
0015 
0016 #include <linux/slab.h>
0017 #include <linux/firmware.h>
0018 #include <linux/etherdevice.h>
0019 #include <linux/module.h>
0020 
0021 #include <net/mac80211.h>
0022 
0023 #include "p54.h"
0024 #include "lmac.h"
0025 
0026 static bool modparam_nohwcrypt;
0027 module_param_named(nohwcrypt, modparam_nohwcrypt, bool, 0444);
0028 MODULE_PARM_DESC(nohwcrypt, "Disable hardware encryption.");
0029 MODULE_AUTHOR("Michael Wu <flamingice@sourmilk.net>");
0030 MODULE_DESCRIPTION("Softmac Prism54 common code");
0031 MODULE_LICENSE("GPL");
0032 MODULE_ALIAS("prism54common");
0033 
0034 static int p54_sta_add_remove(struct ieee80211_hw *hw,
0035                   struct ieee80211_vif *vif,
0036                   struct ieee80211_sta *sta)
0037 {
0038     struct p54_common *priv = hw->priv;
0039 
0040     /*
0041      * Notify the firmware that we don't want or we don't
0042      * need to buffer frames for this station anymore.
0043      */
0044 
0045     p54_sta_unlock(priv, sta->addr);
0046 
0047     return 0;
0048 }
0049 
0050 static void p54_sta_notify(struct ieee80211_hw *dev, struct ieee80211_vif *vif,
0051                   enum sta_notify_cmd notify_cmd,
0052                   struct ieee80211_sta *sta)
0053 {
0054     struct p54_common *priv = dev->priv;
0055 
0056     switch (notify_cmd) {
0057     case STA_NOTIFY_AWAKE:
0058         /* update the firmware's filter table */
0059         p54_sta_unlock(priv, sta->addr);
0060         break;
0061     default:
0062         break;
0063     }
0064 }
0065 
0066 static int p54_set_tim(struct ieee80211_hw *dev, struct ieee80211_sta *sta,
0067             bool set)
0068 {
0069     struct p54_common *priv = dev->priv;
0070 
0071     return p54_update_beacon_tim(priv, sta->aid, set);
0072 }
0073 
0074 u8 *p54_find_ie(struct sk_buff *skb, u8 ie)
0075 {
0076     struct ieee80211_mgmt *mgmt = (void *)skb->data;
0077     u8 *pos, *end;
0078 
0079     if (skb->len <= sizeof(mgmt))
0080         return NULL;
0081 
0082     pos = (u8 *)mgmt->u.beacon.variable;
0083     end = skb->data + skb->len;
0084     while (pos < end) {
0085         if (pos + 2 + pos[1] > end)
0086             return NULL;
0087 
0088         if (pos[0] == ie)
0089             return pos;
0090 
0091         pos += 2 + pos[1];
0092     }
0093     return NULL;
0094 }
0095 
0096 static int p54_beacon_format_ie_tim(struct sk_buff *skb)
0097 {
0098     /*
0099      * the good excuse for this mess is ... the firmware.
0100      * The dummy TIM MUST be at the end of the beacon frame,
0101      * because it'll be overwritten!
0102      */
0103     u8 *tim;
0104     u8 dtim_len;
0105     u8 dtim_period;
0106     u8 *next;
0107 
0108     tim = p54_find_ie(skb, WLAN_EID_TIM);
0109     if (!tim)
0110         return 0;
0111 
0112     dtim_len = tim[1];
0113     dtim_period = tim[3];
0114     next = tim + 2 + dtim_len;
0115 
0116     if (dtim_len < 3)
0117         return -EINVAL;
0118 
0119     memmove(tim, next, skb_tail_pointer(skb) - next);
0120     tim = skb_tail_pointer(skb) - (dtim_len + 2);
0121 
0122     /* add the dummy at the end */
0123     tim[0] = WLAN_EID_TIM;
0124     tim[1] = 3;
0125     tim[2] = 0;
0126     tim[3] = dtim_period;
0127     tim[4] = 0;
0128 
0129     if (dtim_len > 3)
0130         skb_trim(skb, skb->len - (dtim_len - 3));
0131 
0132     return 0;
0133 }
0134 
0135 static int p54_beacon_update(struct p54_common *priv,
0136             struct ieee80211_vif *vif)
0137 {
0138     struct ieee80211_tx_control control = { };
0139     struct sk_buff *beacon;
0140     int ret;
0141 
0142     beacon = ieee80211_beacon_get(priv->hw, vif, 0);
0143     if (!beacon)
0144         return -ENOMEM;
0145     ret = p54_beacon_format_ie_tim(beacon);
0146     if (ret)
0147         return ret;
0148 
0149     /*
0150      * During operation, the firmware takes care of beaconing.
0151      * The driver only needs to upload a new beacon template, once
0152      * the template was changed by the stack or userspace.
0153      *
0154      * LMAC API 3.2.2 also specifies that the driver does not need
0155      * to cancel the old beacon template by hand, instead the firmware
0156      * will release the previous one through the feedback mechanism.
0157      */
0158     p54_tx_80211(priv->hw, &control, beacon);
0159     priv->tsf_high32 = 0;
0160     priv->tsf_low32 = 0;
0161 
0162     return 0;
0163 }
0164 
0165 static int p54_start(struct ieee80211_hw *dev)
0166 {
0167     struct p54_common *priv = dev->priv;
0168     int err;
0169 
0170     mutex_lock(&priv->conf_mutex);
0171     err = priv->open(dev);
0172     if (err)
0173         goto out;
0174     P54_SET_QUEUE(priv->qos_params[0], 0x0002, 0x0003, 0x0007, 47);
0175     P54_SET_QUEUE(priv->qos_params[1], 0x0002, 0x0007, 0x000f, 94);
0176     P54_SET_QUEUE(priv->qos_params[2], 0x0003, 0x000f, 0x03ff, 0);
0177     P54_SET_QUEUE(priv->qos_params[3], 0x0007, 0x000f, 0x03ff, 0);
0178     err = p54_set_edcf(priv);
0179     if (err)
0180         goto out;
0181 
0182     eth_broadcast_addr(priv->bssid);
0183     priv->mode = NL80211_IFTYPE_MONITOR;
0184     err = p54_setup_mac(priv);
0185     if (err) {
0186         priv->mode = NL80211_IFTYPE_UNSPECIFIED;
0187         goto out;
0188     }
0189 
0190     ieee80211_queue_delayed_work(dev, &priv->work, 0);
0191 
0192     priv->softled_state = 0;
0193     err = p54_set_leds(priv);
0194 
0195 out:
0196     mutex_unlock(&priv->conf_mutex);
0197     return err;
0198 }
0199 
0200 static void p54_stop(struct ieee80211_hw *dev)
0201 {
0202     struct p54_common *priv = dev->priv;
0203     int i;
0204 
0205     priv->mode = NL80211_IFTYPE_UNSPECIFIED;
0206     priv->softled_state = 0;
0207     cancel_delayed_work_sync(&priv->work);
0208     mutex_lock(&priv->conf_mutex);
0209     p54_set_leds(priv);
0210     priv->stop(dev);
0211     skb_queue_purge(&priv->tx_pending);
0212     skb_queue_purge(&priv->tx_queue);
0213     for (i = 0; i < P54_QUEUE_NUM; i++) {
0214         priv->tx_stats[i].count = 0;
0215         priv->tx_stats[i].len = 0;
0216     }
0217 
0218     priv->beacon_req_id = cpu_to_le32(0);
0219     priv->tsf_high32 = priv->tsf_low32 = 0;
0220     mutex_unlock(&priv->conf_mutex);
0221 }
0222 
0223 static int p54_add_interface(struct ieee80211_hw *dev,
0224                  struct ieee80211_vif *vif)
0225 {
0226     struct p54_common *priv = dev->priv;
0227     int err;
0228 
0229     vif->driver_flags |= IEEE80211_VIF_BEACON_FILTER;
0230 
0231     mutex_lock(&priv->conf_mutex);
0232     if (priv->mode != NL80211_IFTYPE_MONITOR) {
0233         mutex_unlock(&priv->conf_mutex);
0234         return -EOPNOTSUPP;
0235     }
0236 
0237     priv->vif = vif;
0238 
0239     switch (vif->type) {
0240     case NL80211_IFTYPE_STATION:
0241     case NL80211_IFTYPE_ADHOC:
0242     case NL80211_IFTYPE_AP:
0243     case NL80211_IFTYPE_MESH_POINT:
0244         priv->mode = vif->type;
0245         break;
0246     default:
0247         mutex_unlock(&priv->conf_mutex);
0248         return -EOPNOTSUPP;
0249     }
0250 
0251     memcpy(priv->mac_addr, vif->addr, ETH_ALEN);
0252     err = p54_setup_mac(priv);
0253     mutex_unlock(&priv->conf_mutex);
0254     return err;
0255 }
0256 
0257 static void p54_remove_interface(struct ieee80211_hw *dev,
0258                  struct ieee80211_vif *vif)
0259 {
0260     struct p54_common *priv = dev->priv;
0261 
0262     mutex_lock(&priv->conf_mutex);
0263     priv->vif = NULL;
0264 
0265     /*
0266      * LMAC API 3.2.2 states that any active beacon template must be
0267      * canceled by the driver before attempting a mode transition.
0268      */
0269     if (le32_to_cpu(priv->beacon_req_id) != 0) {
0270         p54_tx_cancel(priv, priv->beacon_req_id);
0271         wait_for_completion_interruptible_timeout(&priv->beacon_comp, HZ);
0272     }
0273     priv->mode = NL80211_IFTYPE_MONITOR;
0274     eth_zero_addr(priv->mac_addr);
0275     eth_zero_addr(priv->bssid);
0276     p54_setup_mac(priv);
0277     mutex_unlock(&priv->conf_mutex);
0278 }
0279 
0280 static int p54_wait_for_stats(struct ieee80211_hw *dev)
0281 {
0282     struct p54_common *priv = dev->priv;
0283     int ret;
0284 
0285     priv->update_stats = true;
0286     ret = p54_fetch_statistics(priv);
0287     if (ret)
0288         return ret;
0289 
0290     ret = wait_for_completion_interruptible_timeout(&priv->stat_comp, HZ);
0291     if (ret == 0)
0292         return -ETIMEDOUT;
0293 
0294     return 0;
0295 }
0296 
0297 static void p54_reset_stats(struct p54_common *priv)
0298 {
0299     struct ieee80211_channel *chan = priv->curchan;
0300 
0301     if (chan) {
0302         struct survey_info *info = &priv->survey[chan->hw_value];
0303 
0304         /* only reset channel statistics, don't touch .filled, etc. */
0305         info->time = 0;
0306         info->time_busy = 0;
0307         info->time_tx = 0;
0308     }
0309 
0310     priv->update_stats = true;
0311     priv->survey_raw.active = 0;
0312     priv->survey_raw.cca = 0;
0313     priv->survey_raw.tx = 0;
0314 }
0315 
0316 static int p54_config(struct ieee80211_hw *dev, u32 changed)
0317 {
0318     int ret = 0;
0319     struct p54_common *priv = dev->priv;
0320     struct ieee80211_conf *conf = &dev->conf;
0321 
0322     mutex_lock(&priv->conf_mutex);
0323     if (changed & IEEE80211_CONF_CHANGE_POWER)
0324         priv->output_power = conf->power_level << 2;
0325     if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
0326         struct ieee80211_channel *oldchan;
0327         WARN_ON(p54_wait_for_stats(dev));
0328         oldchan = priv->curchan;
0329         priv->curchan = NULL;
0330         ret = p54_scan(priv, P54_SCAN_EXIT, 0);
0331         if (ret) {
0332             priv->curchan = oldchan;
0333             goto out;
0334         }
0335         /*
0336          * TODO: Use the LM_SCAN_TRAP to determine the current
0337          * operating channel.
0338          */
0339         priv->curchan = priv->hw->conf.chandef.chan;
0340         p54_reset_stats(priv);
0341         WARN_ON(p54_fetch_statistics(priv));
0342     }
0343     if (changed & IEEE80211_CONF_CHANGE_PS) {
0344         WARN_ON(p54_wait_for_stats(dev));
0345         ret = p54_set_ps(priv);
0346         if (ret)
0347             goto out;
0348         WARN_ON(p54_wait_for_stats(dev));
0349     }
0350     if (changed & IEEE80211_CONF_CHANGE_IDLE) {
0351         WARN_ON(p54_wait_for_stats(dev));
0352         ret = p54_setup_mac(priv);
0353         if (ret)
0354             goto out;
0355         WARN_ON(p54_wait_for_stats(dev));
0356     }
0357 
0358 out:
0359     mutex_unlock(&priv->conf_mutex);
0360     return ret;
0361 }
0362 
0363 static u64 p54_prepare_multicast(struct ieee80211_hw *dev,
0364                  struct netdev_hw_addr_list *mc_list)
0365 {
0366     struct p54_common *priv = dev->priv;
0367     struct netdev_hw_addr *ha;
0368     int i;
0369 
0370     BUILD_BUG_ON(ARRAY_SIZE(priv->mc_maclist) !=
0371         ARRAY_SIZE(((struct p54_group_address_table *)NULL)->mac_list));
0372     /*
0373      * The first entry is reserved for the global broadcast MAC.
0374      * Otherwise the firmware will drop it and ARP will no longer work.
0375      */
0376     i = 1;
0377     priv->mc_maclist_num = netdev_hw_addr_list_count(mc_list) + i;
0378     netdev_hw_addr_list_for_each(ha, mc_list) {
0379         memcpy(&priv->mc_maclist[i], ha->addr, ETH_ALEN);
0380         i++;
0381         if (i >= ARRAY_SIZE(priv->mc_maclist))
0382             break;
0383     }
0384 
0385     return 1; /* update */
0386 }
0387 
0388 static void p54_configure_filter(struct ieee80211_hw *dev,
0389                  unsigned int changed_flags,
0390                  unsigned int *total_flags,
0391                  u64 multicast)
0392 {
0393     struct p54_common *priv = dev->priv;
0394 
0395     *total_flags &= FIF_ALLMULTI | FIF_OTHER_BSS;
0396 
0397     priv->filter_flags = *total_flags;
0398 
0399     if (changed_flags & FIF_OTHER_BSS)
0400         p54_setup_mac(priv);
0401 
0402     if (changed_flags & FIF_ALLMULTI || multicast)
0403         p54_set_groupfilter(priv);
0404 }
0405 
0406 static int p54_conf_tx(struct ieee80211_hw *dev,
0407                struct ieee80211_vif *vif,
0408                unsigned int link_id, u16 queue,
0409                const struct ieee80211_tx_queue_params *params)
0410 {
0411     struct p54_common *priv = dev->priv;
0412     int ret;
0413 
0414     mutex_lock(&priv->conf_mutex);
0415     P54_SET_QUEUE(priv->qos_params[queue], params->aifs,
0416               params->cw_min, params->cw_max, params->txop);
0417     ret = p54_set_edcf(priv);
0418     mutex_unlock(&priv->conf_mutex);
0419     return ret;
0420 }
0421 
0422 static void p54_work(struct work_struct *work)
0423 {
0424     struct p54_common *priv = container_of(work, struct p54_common,
0425                            work.work);
0426 
0427     if (unlikely(priv->mode == NL80211_IFTYPE_UNSPECIFIED))
0428         return ;
0429 
0430     /*
0431      * TODO: walk through tx_queue and do the following tasks
0432      *  1. initiate bursts.
0433      *      2. cancel stuck frames / reset the device if necessary.
0434      */
0435 
0436     mutex_lock(&priv->conf_mutex);
0437     WARN_ON_ONCE(p54_fetch_statistics(priv));
0438     mutex_unlock(&priv->conf_mutex);
0439 }
0440 
0441 static int p54_get_stats(struct ieee80211_hw *dev,
0442              struct ieee80211_low_level_stats *stats)
0443 {
0444     struct p54_common *priv = dev->priv;
0445 
0446     memcpy(stats, &priv->stats, sizeof(*stats));
0447     return 0;
0448 }
0449 
0450 static void p54_bss_info_changed(struct ieee80211_hw *dev,
0451                  struct ieee80211_vif *vif,
0452                  struct ieee80211_bss_conf *info,
0453                  u64 changed)
0454 {
0455     struct p54_common *priv = dev->priv;
0456 
0457     mutex_lock(&priv->conf_mutex);
0458     if (changed & BSS_CHANGED_BSSID) {
0459         memcpy(priv->bssid, info->bssid, ETH_ALEN);
0460         p54_setup_mac(priv);
0461     }
0462 
0463     if (changed & BSS_CHANGED_BEACON) {
0464         p54_scan(priv, P54_SCAN_EXIT, 0);
0465         p54_setup_mac(priv);
0466         p54_beacon_update(priv, vif);
0467         p54_set_edcf(priv);
0468     }
0469 
0470     if (changed & (BSS_CHANGED_ERP_SLOT | BSS_CHANGED_BEACON)) {
0471         priv->use_short_slot = info->use_short_slot;
0472         p54_set_edcf(priv);
0473     }
0474     if (changed & BSS_CHANGED_BASIC_RATES) {
0475         if (dev->conf.chandef.chan->band == NL80211_BAND_5GHZ)
0476             priv->basic_rate_mask = (info->basic_rates << 4);
0477         else
0478             priv->basic_rate_mask = info->basic_rates;
0479         p54_setup_mac(priv);
0480         if (priv->fw_var >= 0x500)
0481             p54_scan(priv, P54_SCAN_EXIT, 0);
0482     }
0483     if (changed & BSS_CHANGED_ASSOC) {
0484         if (vif->cfg.assoc) {
0485             priv->aid = vif->cfg.aid;
0486             priv->wakeup_timer = info->beacon_int *
0487                          info->dtim_period * 5;
0488             p54_setup_mac(priv);
0489         } else {
0490             priv->wakeup_timer = 500;
0491             priv->aid = 0;
0492         }
0493     }
0494 
0495     mutex_unlock(&priv->conf_mutex);
0496 }
0497 
0498 static int p54_set_key(struct ieee80211_hw *dev, enum set_key_cmd cmd,
0499                struct ieee80211_vif *vif, struct ieee80211_sta *sta,
0500                struct ieee80211_key_conf *key)
0501 {
0502     struct p54_common *priv = dev->priv;
0503     int slot, ret = 0;
0504     u8 algo = 0;
0505     u8 *addr = NULL;
0506 
0507     if (modparam_nohwcrypt)
0508         return -EOPNOTSUPP;
0509 
0510     if (key->flags & IEEE80211_KEY_FLAG_RX_MGMT) {
0511         /*
0512          * Unfortunately most/all firmwares are trying to decrypt
0513          * incoming management frames if a suitable key can be found.
0514          * However, in doing so the data in these frames gets
0515          * corrupted. So, we can't have firmware supported crypto
0516          * offload in this case.
0517          */
0518         return -EOPNOTSUPP;
0519     }
0520 
0521     mutex_lock(&priv->conf_mutex);
0522     if (cmd == SET_KEY) {
0523         switch (key->cipher) {
0524         case WLAN_CIPHER_SUITE_TKIP:
0525             if (!(priv->privacy_caps & (BR_DESC_PRIV_CAP_MICHAEL |
0526                   BR_DESC_PRIV_CAP_TKIP))) {
0527                 ret = -EOPNOTSUPP;
0528                 goto out_unlock;
0529             }
0530             key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
0531             algo = P54_CRYPTO_TKIPMICHAEL;
0532             break;
0533         case WLAN_CIPHER_SUITE_WEP40:
0534         case WLAN_CIPHER_SUITE_WEP104:
0535             if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_WEP)) {
0536                 ret = -EOPNOTSUPP;
0537                 goto out_unlock;
0538             }
0539             key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
0540             algo = P54_CRYPTO_WEP;
0541             break;
0542         case WLAN_CIPHER_SUITE_CCMP:
0543             if (!(priv->privacy_caps & BR_DESC_PRIV_CAP_AESCCMP)) {
0544                 ret = -EOPNOTSUPP;
0545                 goto out_unlock;
0546             }
0547             key->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
0548             algo = P54_CRYPTO_AESCCMP;
0549             break;
0550         default:
0551             ret = -EOPNOTSUPP;
0552             goto out_unlock;
0553         }
0554         slot = bitmap_find_free_region(priv->used_rxkeys,
0555                            priv->rx_keycache_size, 0);
0556 
0557         if (slot < 0) {
0558             /*
0559              * The device supports the chosen algorithm, but the
0560              * firmware does not provide enough key slots to store
0561              * all of them.
0562              * But encryption offload for outgoing frames is always
0563              * possible, so we just pretend that the upload was
0564              * successful and do the decryption in software.
0565              */
0566 
0567             /* mark the key as invalid. */
0568             key->hw_key_idx = 0xff;
0569             goto out_unlock;
0570         }
0571 
0572         key->flags |= IEEE80211_KEY_FLAG_RESERVE_TAILROOM;
0573     } else {
0574         slot = key->hw_key_idx;
0575 
0576         if (slot == 0xff) {
0577             /* This key was not uploaded into the rx key cache. */
0578 
0579             goto out_unlock;
0580         }
0581 
0582         bitmap_release_region(priv->used_rxkeys, slot, 0);
0583         algo = 0;
0584     }
0585 
0586     if (sta)
0587         addr = sta->addr;
0588 
0589     ret = p54_upload_key(priv, algo, slot, key->keyidx,
0590                  key->keylen, addr, key->key);
0591     if (ret) {
0592         bitmap_release_region(priv->used_rxkeys, slot, 0);
0593         ret = -EOPNOTSUPP;
0594         goto out_unlock;
0595     }
0596 
0597     key->hw_key_idx = slot;
0598 
0599 out_unlock:
0600     mutex_unlock(&priv->conf_mutex);
0601     return ret;
0602 }
0603 
0604 static int p54_get_survey(struct ieee80211_hw *dev, int idx,
0605                 struct survey_info *survey)
0606 {
0607     struct p54_common *priv = dev->priv;
0608     struct ieee80211_channel *chan;
0609     int err, tries;
0610     bool in_use = false;
0611 
0612     if (idx >= priv->chan_num)
0613         return -ENOENT;
0614 
0615 #define MAX_TRIES 1
0616     for (tries = 0; tries < MAX_TRIES; tries++) {
0617         chan = priv->curchan;
0618         if (chan && chan->hw_value == idx) {
0619             mutex_lock(&priv->conf_mutex);
0620             err = p54_wait_for_stats(dev);
0621             mutex_unlock(&priv->conf_mutex);
0622             if (err)
0623                 return err;
0624 
0625             in_use = true;
0626         }
0627 
0628         memcpy(survey, &priv->survey[idx], sizeof(*survey));
0629 
0630         if (in_use) {
0631             /* test if the reported statistics are valid. */
0632             if  (survey->time != 0) {
0633                 survey->filled |= SURVEY_INFO_IN_USE;
0634             } else {
0635                 /*
0636                  * hw/fw has not accumulated enough sample sets.
0637                  * Wait for 100ms, this ought to be enough to
0638                  * to get at least one non-null set of channel
0639                  * usage statistics.
0640                  */
0641                 msleep(100);
0642                 continue;
0643             }
0644         }
0645         return 0;
0646     }
0647     return -ETIMEDOUT;
0648 #undef MAX_TRIES
0649 }
0650 
0651 static unsigned int p54_flush_count(struct p54_common *priv)
0652 {
0653     unsigned int total = 0, i;
0654 
0655     BUILD_BUG_ON(P54_QUEUE_NUM > ARRAY_SIZE(priv->tx_stats));
0656 
0657     /*
0658      * Because the firmware has the sole control over any frames
0659      * in the P54_QUEUE_BEACON or P54_QUEUE_SCAN queues, they
0660      * don't really count as pending or active.
0661      */
0662     for (i = P54_QUEUE_MGMT; i < P54_QUEUE_NUM; i++)
0663         total += priv->tx_stats[i].len;
0664     return total;
0665 }
0666 
0667 static void p54_flush(struct ieee80211_hw *dev, struct ieee80211_vif *vif,
0668               u32 queues, bool drop)
0669 {
0670     struct p54_common *priv = dev->priv;
0671     unsigned int total, i;
0672 
0673     /*
0674      * Currently, it wouldn't really matter if we wait for one second
0675      * or 15 minutes. But once someone gets around and completes the
0676      * TODOs [ancel stuck frames / reset device] in p54_work, it will
0677      * suddenly make sense to wait that long.
0678      */
0679     i = P54_STATISTICS_UPDATE * 2 / 20;
0680 
0681     /*
0682      * In this case no locking is required because as we speak the
0683      * queues have already been stopped and no new frames can sneak
0684      * up from behind.
0685      */
0686     while ((total = p54_flush_count(priv)) && i--) {
0687         /* waste time */
0688         msleep(20);
0689     }
0690 
0691     WARN(total, "tx flush timeout, unresponsive firmware");
0692 }
0693 
0694 static void p54_set_coverage_class(struct ieee80211_hw *dev,
0695                    s16 coverage_class)
0696 {
0697     struct p54_common *priv = dev->priv;
0698 
0699     mutex_lock(&priv->conf_mutex);
0700     /* support all coverage class values as in 802.11-2007 Table 7-27 */
0701     priv->coverage_class = clamp_t(u8, coverage_class, 0, 31);
0702     p54_set_edcf(priv);
0703     mutex_unlock(&priv->conf_mutex);
0704 }
0705 
0706 static const struct ieee80211_ops p54_ops = {
0707     .tx         = p54_tx_80211,
0708     .start          = p54_start,
0709     .stop           = p54_stop,
0710     .add_interface      = p54_add_interface,
0711     .remove_interface   = p54_remove_interface,
0712     .set_tim        = p54_set_tim,
0713     .sta_notify     = p54_sta_notify,
0714     .sta_add        = p54_sta_add_remove,
0715     .sta_remove     = p54_sta_add_remove,
0716     .set_key        = p54_set_key,
0717     .config         = p54_config,
0718     .flush          = p54_flush,
0719     .bss_info_changed   = p54_bss_info_changed,
0720     .prepare_multicast  = p54_prepare_multicast,
0721     .configure_filter   = p54_configure_filter,
0722     .conf_tx        = p54_conf_tx,
0723     .get_stats      = p54_get_stats,
0724     .get_survey     = p54_get_survey,
0725     .set_coverage_class = p54_set_coverage_class,
0726 };
0727 
0728 struct ieee80211_hw *p54_init_common(size_t priv_data_len)
0729 {
0730     struct ieee80211_hw *dev;
0731     struct p54_common *priv;
0732 
0733     dev = ieee80211_alloc_hw(priv_data_len, &p54_ops);
0734     if (!dev)
0735         return NULL;
0736 
0737     priv = dev->priv;
0738     priv->hw = dev;
0739     priv->mode = NL80211_IFTYPE_UNSPECIFIED;
0740     priv->basic_rate_mask = 0x15f;
0741     spin_lock_init(&priv->tx_stats_lock);
0742     skb_queue_head_init(&priv->tx_queue);
0743     skb_queue_head_init(&priv->tx_pending);
0744     ieee80211_hw_set(dev, REPORTS_TX_ACK_STATUS);
0745     ieee80211_hw_set(dev, MFP_CAPABLE);
0746     ieee80211_hw_set(dev, PS_NULLFUNC_STACK);
0747     ieee80211_hw_set(dev, SUPPORTS_PS);
0748     ieee80211_hw_set(dev, RX_INCLUDES_FCS);
0749     ieee80211_hw_set(dev, SIGNAL_DBM);
0750 
0751     dev->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION) |
0752                       BIT(NL80211_IFTYPE_ADHOC) |
0753                       BIT(NL80211_IFTYPE_AP) |
0754                       BIT(NL80211_IFTYPE_MESH_POINT);
0755 
0756     priv->beacon_req_id = cpu_to_le32(0);
0757     priv->tx_stats[P54_QUEUE_BEACON].limit = 1;
0758     priv->tx_stats[P54_QUEUE_FWSCAN].limit = 1;
0759     priv->tx_stats[P54_QUEUE_MGMT].limit = 3;
0760     priv->tx_stats[P54_QUEUE_CAB].limit = 3;
0761     priv->tx_stats[P54_QUEUE_DATA].limit = 5;
0762     dev->queues = 1;
0763     priv->noise = -94;
0764     /*
0765      * We support at most 8 tries no matter which rate they're at,
0766      * we cannot support max_rates * max_rate_tries as we set it
0767      * here, but setting it correctly to 4/2 or so would limit us
0768      * artificially if the RC algorithm wants just two rates, so
0769      * let's say 4/7, we'll redistribute it at TX time, see the
0770      * comments there.
0771      */
0772     dev->max_rates = 4;
0773     dev->max_rate_tries = 7;
0774     dev->extra_tx_headroom = sizeof(struct p54_hdr) + 4 +
0775                  sizeof(struct p54_tx_data);
0776 
0777     /*
0778      * For now, disable PS by default because it affects
0779      * link stability significantly.
0780      */
0781     dev->wiphy->flags &= ~WIPHY_FLAG_PS_ON_BY_DEFAULT;
0782 
0783     mutex_init(&priv->conf_mutex);
0784     mutex_init(&priv->eeprom_mutex);
0785     init_completion(&priv->stat_comp);
0786     init_completion(&priv->eeprom_comp);
0787     init_completion(&priv->beacon_comp);
0788     INIT_DELAYED_WORK(&priv->work, p54_work);
0789 
0790     eth_broadcast_addr(priv->mc_maclist[0]);
0791     priv->curchan = NULL;
0792     p54_reset_stats(priv);
0793     return dev;
0794 }
0795 EXPORT_SYMBOL_GPL(p54_init_common);
0796 
0797 int p54_register_common(struct ieee80211_hw *dev, struct device *pdev)
0798 {
0799     struct p54_common __maybe_unused *priv = dev->priv;
0800     int err;
0801 
0802     err = ieee80211_register_hw(dev);
0803     if (err) {
0804         dev_err(pdev, "Cannot register device (%d).\n", err);
0805         return err;
0806     }
0807     priv->registered = true;
0808 
0809 #ifdef CONFIG_P54_LEDS
0810     err = p54_init_leds(priv);
0811     if (err) {
0812         p54_unregister_common(dev);
0813         return err;
0814     }
0815 #endif /* CONFIG_P54_LEDS */
0816 
0817     dev_info(pdev, "is registered as '%s'\n", wiphy_name(dev->wiphy));
0818     return 0;
0819 }
0820 EXPORT_SYMBOL_GPL(p54_register_common);
0821 
0822 void p54_free_common(struct ieee80211_hw *dev)
0823 {
0824     struct p54_common *priv = dev->priv;
0825     unsigned int i;
0826 
0827     for (i = 0; i < NUM_NL80211_BANDS; i++)
0828         kfree(priv->band_table[i]);
0829 
0830     kfree(priv->iq_autocal);
0831     kfree(priv->output_limit);
0832     kfree(priv->curve_data);
0833     kfree(priv->rssi_db);
0834     bitmap_free(priv->used_rxkeys);
0835     kfree(priv->survey);
0836     priv->iq_autocal = NULL;
0837     priv->output_limit = NULL;
0838     priv->curve_data = NULL;
0839     priv->rssi_db = NULL;
0840     priv->used_rxkeys = NULL;
0841     priv->survey = NULL;
0842     ieee80211_free_hw(dev);
0843 }
0844 EXPORT_SYMBOL_GPL(p54_free_common);
0845 
0846 void p54_unregister_common(struct ieee80211_hw *dev)
0847 {
0848     struct p54_common *priv = dev->priv;
0849 
0850     if (priv->registered) {
0851         priv->registered = false;
0852 #ifdef CONFIG_P54_LEDS
0853         p54_unregister_leds(priv);
0854 #endif /* CONFIG_P54_LEDS */
0855         ieee80211_unregister_hw(dev);
0856     }
0857 
0858     mutex_destroy(&priv->conf_mutex);
0859     mutex_destroy(&priv->eeprom_mutex);
0860 }
0861 EXPORT_SYMBOL_GPL(p54_unregister_common);
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