diff options
Diffstat (limited to 'net/mac80211/tx.c')
-rw-r--r-- | net/mac80211/tx.c | 199 |
1 files changed, 80 insertions, 119 deletions
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index 5950e3a..081dcaf 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -33,10 +33,6 @@ #include "wme.h" #include "rate.h" -#define IEEE80211_TX_OK 0 -#define IEEE80211_TX_AGAIN 1 -#define IEEE80211_TX_PENDING 2 - /* misc utils */ static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, int group_addr, @@ -236,6 +232,7 @@ ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) if (local->hw.conf.flags & IEEE80211_CONF_PS) { ieee80211_stop_queues_by_reason(&local->hw, IEEE80211_QUEUE_STOP_REASON_PS); + ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; ieee80211_queue_work(&local->hw, &local->dynamic_ps_disable_work); } @@ -257,7 +254,8 @@ ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) return TX_CONTINUE; - if (unlikely(test_bit(SCAN_OFF_CHANNEL, &tx->local->scanning)) && + if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && + test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && !ieee80211_is_probe_req(hdr->frame_control) && !ieee80211_is_nullfunc(hdr->frame_control)) /* @@ -1283,16 +1281,17 @@ ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, return TX_CONTINUE; } -static int __ieee80211_tx(struct ieee80211_local *local, - struct sk_buff **skbp, - struct sta_info *sta, - bool txpending) +/* + * Returns false if the frame couldn't be transmitted but was queued instead. + */ +static bool __ieee80211_tx(struct ieee80211_local *local, struct sk_buff **skbp, + struct sta_info *sta, bool txpending) { struct sk_buff *skb = *skbp, *next; struct ieee80211_tx_info *info; struct ieee80211_sub_if_data *sdata; unsigned long flags; - int ret, len; + int len; bool fragm = false; while (skb) { @@ -1300,13 +1299,37 @@ static int __ieee80211_tx(struct ieee80211_local *local, __le16 fc; spin_lock_irqsave(&local->queue_stop_reason_lock, flags); - ret = IEEE80211_TX_OK; if (local->queue_stop_reasons[q] || - (!txpending && !skb_queue_empty(&local->pending[q]))) - ret = IEEE80211_TX_PENDING; + (!txpending && !skb_queue_empty(&local->pending[q]))) { + /* + * Since queue is stopped, queue up frames for later + * transmission from the tx-pending tasklet when the + * queue is woken again. + */ + + do { + next = skb->next; + skb->next = NULL; + /* + * NB: If txpending is true, next must already + * be NULL since we must've gone through this + * loop before already; therefore we can just + * queue the frame to the head without worrying + * about reordering of fragments. + */ + if (unlikely(txpending)) + __skb_queue_head(&local->pending[q], + skb); + else + __skb_queue_tail(&local->pending[q], + skb); + } while ((skb = next)); + + spin_unlock_irqrestore(&local->queue_stop_reason_lock, + flags); + return false; + } spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); - if (ret != IEEE80211_TX_OK) - return ret; info = IEEE80211_SKB_CB(skb); @@ -1341,15 +1364,7 @@ static int __ieee80211_tx(struct ieee80211_local *local, info->control.sta = NULL; fc = ((struct ieee80211_hdr *)skb->data)->frame_control; - ret = drv_tx(local, skb); - if (WARN_ON(ret != NETDEV_TX_OK && skb->len != len)) { - dev_kfree_skb(skb); - ret = NETDEV_TX_OK; - } - if (ret != NETDEV_TX_OK) { - info->control.vif = &sdata->vif; - return IEEE80211_TX_AGAIN; - } + drv_tx(local, skb); ieee80211_tpt_led_trig_tx(local, fc, len); *skbp = skb = next; @@ -1357,7 +1372,7 @@ static int __ieee80211_tx(struct ieee80211_local *local, fragm = true; } - return IEEE80211_TX_OK; + return true; } /* @@ -1394,7 +1409,8 @@ static int invoke_tx_handlers(struct ieee80211_tx_data *tx) /* handlers after fragment must be aware of tx info fragmentation! */ CALL_TXH(ieee80211_tx_h_stats); CALL_TXH(ieee80211_tx_h_encrypt); - CALL_TXH(ieee80211_tx_h_calculate_duration); + if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) + CALL_TXH(ieee80211_tx_h_calculate_duration); #undef CALL_TXH txh_done: @@ -1416,23 +1432,24 @@ static int invoke_tx_handlers(struct ieee80211_tx_data *tx) return 0; } -static void ieee80211_tx(struct ieee80211_sub_if_data *sdata, +/* + * Returns false if the frame couldn't be transmitted but was queued instead. + */ +static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb, bool txpending) { struct ieee80211_local *local = sdata->local; struct ieee80211_tx_data tx; ieee80211_tx_result res_prepare; struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); - struct sk_buff *next; - unsigned long flags; - int ret, retries; u16 queue; + bool result = true; queue = skb_get_queue_mapping(skb); if (unlikely(skb->len < 10)) { dev_kfree_skb(skb); - return; + return true; } rcu_read_lock(); @@ -1442,85 +1459,19 @@ static void ieee80211_tx(struct ieee80211_sub_if_data *sdata, if (unlikely(res_prepare == TX_DROP)) { dev_kfree_skb(skb); - rcu_read_unlock(); - return; + goto out; } else if (unlikely(res_prepare == TX_QUEUED)) { - rcu_read_unlock(); - return; + goto out; } tx.channel = local->hw.conf.channel; info->band = tx.channel->band; - if (invoke_tx_handlers(&tx)) - goto out; - - retries = 0; - retry: - ret = __ieee80211_tx(local, &tx.skb, tx.sta, txpending); - switch (ret) { - case IEEE80211_TX_OK: - break; - case IEEE80211_TX_AGAIN: - /* - * Since there are no fragmented frames on A-MPDU - * queues, there's no reason for a driver to reject - * a frame there, warn and drop it. - */ - if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) - goto drop; - /* fall through */ - case IEEE80211_TX_PENDING: - skb = tx.skb; - - spin_lock_irqsave(&local->queue_stop_reason_lock, flags); - - if (local->queue_stop_reasons[queue] || - !skb_queue_empty(&local->pending[queue])) { - /* - * if queue is stopped, queue up frames for later - * transmission from the tasklet - */ - do { - next = skb->next; - skb->next = NULL; - if (unlikely(txpending)) - __skb_queue_head(&local->pending[queue], - skb); - else - __skb_queue_tail(&local->pending[queue], - skb); - } while ((skb = next)); - - spin_unlock_irqrestore(&local->queue_stop_reason_lock, - flags); - } else { - /* - * otherwise retry, but this is a race condition or - * a driver bug (which we warn about if it persists) - */ - spin_unlock_irqrestore(&local->queue_stop_reason_lock, - flags); - - retries++; - if (WARN(retries > 10, "tx refused but queue active\n")) - goto drop; - goto retry; - } - } + if (!invoke_tx_handlers(&tx)) + result = __ieee80211_tx(local, &tx.skb, tx.sta, txpending); out: rcu_read_unlock(); - return; - - drop: - rcu_read_unlock(); - - skb = tx.skb; - while (skb) { - next = skb->next; - dev_kfree_skb(skb); - skb = next; - } + return result; } /* device xmit handlers */ @@ -1547,7 +1498,7 @@ static int ieee80211_skb_resize(struct ieee80211_local *local, skb_orphan(skb); } - if (skb_header_cloned(skb)) + if (skb_cloned(skb)) I802_DEBUG_INC(local->tx_expand_skb_head_cloned); else if (head_need || tail_need) I802_DEBUG_INC(local->tx_expand_skb_head); @@ -1750,7 +1701,7 @@ netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, __le16 fc; struct ieee80211_hdr hdr; struct ieee80211s_hdr mesh_hdr __maybe_unused; - struct mesh_path *mppath = NULL; + struct mesh_path __maybe_unused *mppath = NULL; const u8 *encaps_data; int encaps_len, skip_header_bytes; int nh_pos, h_pos; @@ -1815,19 +1766,19 @@ netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, mppath = mpp_path_lookup(skb->data, sdata); /* - * Do not use address extension, if it is a packet from - * the same interface and the destination is not being - * proxied by any other mest point. + * Use address extension if it is a packet from + * another interface or if we know the destination + * is being proxied by a portal (i.e. portal address + * differs from proxied address) */ if (compare_ether_addr(sdata->vif.addr, skb->data + ETH_ALEN) == 0 && - (!mppath || !compare_ether_addr(mppath->mpp, skb->data))) { + !(mppath && compare_ether_addr(mppath->mpp, skb->data))) { hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, skb->data, skb->data + ETH_ALEN); meshhdrlen = ieee80211_new_mesh_header(&mesh_hdr, sdata, NULL, NULL); } else { - /* packet from other interface */ int is_mesh_mcast = 1; const u8 *mesh_da; @@ -2067,6 +2018,11 @@ void ieee80211_clear_tx_pending(struct ieee80211_local *local) skb_queue_purge(&local->pending[i]); } +/* + * Returns false if the frame couldn't be transmitted but was queued instead, + * which in this case means re-queued -- take as an indication to stop sending + * more pending frames. + */ static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, struct sk_buff *skb) { @@ -2074,20 +2030,17 @@ static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, struct ieee80211_sub_if_data *sdata; struct sta_info *sta; struct ieee80211_hdr *hdr; - int ret; - bool result = true; + bool result; sdata = vif_to_sdata(info->control.vif); if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { - ieee80211_tx(sdata, skb, true); + result = ieee80211_tx(sdata, skb, true); } else { hdr = (struct ieee80211_hdr *)skb->data; sta = sta_info_get(sdata, hdr->addr1); - ret = __ieee80211_tx(local, &skb, sta, true); - if (ret != IEEE80211_TX_OK) - result = false; + result = __ieee80211_tx(local, &skb, sta, true); } return result; @@ -2129,8 +2082,6 @@ void ieee80211_tx_pending(unsigned long data) flags); txok = ieee80211_tx_pending_skb(local, skb); - if (!txok) - __skb_queue_head(&local->pending[i], skb); spin_lock_irqsave(&local->queue_stop_reason_lock, flags); if (!txok) @@ -2178,6 +2129,8 @@ static void ieee80211_beacon_add_tim(struct ieee80211_if_ap *bss, if (bss->dtim_count == 0 && !skb_queue_empty(&bss->ps_bc_buf)) aid0 = 1; + bss->dtim_bc_mc = aid0 == 1; + if (have_bits) { /* Find largest even number N1 so that bits numbered 1 through * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits @@ -2230,6 +2183,9 @@ struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, sdata = vif_to_sdata(vif); + if (!ieee80211_sdata_running(sdata)) + goto out; + if (tim_offset) *tim_offset = 0; if (tim_length) @@ -2238,7 +2194,7 @@ struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, if (sdata->vif.type == NL80211_IFTYPE_AP) { ap = &sdata->u.ap; beacon = rcu_dereference(ap->beacon); - if (ap && beacon) { + if (beacon) { /* * headroom, head length, * tail length and maximum TIM length @@ -2299,6 +2255,11 @@ struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, struct ieee80211_mgmt *mgmt; u8 *pos; +#ifdef CONFIG_MAC80211_MESH + if (!sdata->u.mesh.mesh_id_len) + goto out; +#endif + /* headroom, head length, tail length and maximum TIM length */ skb = dev_alloc_skb(local->tx_headroom + 400 + sdata->u.mesh.vendor_ie_len); @@ -2540,7 +2501,7 @@ ieee80211_get_buffered_bc(struct ieee80211_hw *hw, if (sdata->vif.type != NL80211_IFTYPE_AP || !beacon || !beacon->head) goto out; - if (bss->dtim_count != 0) + if (bss->dtim_count != 0 || !bss->dtim_bc_mc) goto out; /* send buffered bc/mc only after DTIM beacon */ while (1) { |