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   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Fri, 21 Aug 2020 05:54:10 +0200
   3 Subject: [PATCH] mac80211: skip encap offload for tx multicast/control
   4  packets
   5
   6 This simplifies the checks in the encap offload tx handler and allows using
   7 it in cases where software crypto is used for multicast packets, e.g. when
   8 using an AP_VLAN.
   9
  10 Signed-off-by: Felix Fietkau <nbd@nbd.name>
  11 ---
  12
  13 --- a/net/mac80211/tx.c
  14 +++ b/net/mac80211/tx.c
  15 @@ -4184,88 +4184,47 @@ static void ieee80211_8023_xmit(struct i
  16                                 struct sk_buff *skb)
  17  {
  18         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  19 -       struct ethhdr *ehdr = (struct ethhdr *)skb->data;
  20         struct ieee80211_local *local = sdata->local;
  21 -       bool authorized = false;
  22 -       bool multicast;
  23 -       unsigned char *ra = ehdr->h_dest;
  24         struct tid_ampdu_tx *tid_tx;
  25         u8 tid;
  26
  27 -       if (IS_ERR(sta) || (sta && !sta->uploaded))
  28 -               sta = NULL;
  29 -
  30 -       if (sdata->vif.type == NL80211_IFTYPE_STATION &&
  31 -           (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER)))
  32 -               ra = sdata->u.mgd.bssid;
  33 -
  34 -       if (is_zero_ether_addr(ra))
  35 -               goto out_free;
  36 -
  37         if (local->ops->wake_tx_queue) {
  38                 u16 queue = __ieee80211_select_queue(sdata, sta, skb);
  39                 skb_set_queue_mapping(skb, queue);
  40                 skb_get_hash(skb);
  41         }
  42
  43 -       multicast = is_multicast_ether_addr(ra);
  44 -
  45 -       if (sta)
  46 -               authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
  47 -
  48 -       if (!multicast && !authorized &&
  49 -           (ehdr->h_proto != sdata->control_port_protocol ||
  50 -            !ether_addr_equal(sdata->vif.addr, ehdr->h_source)))
  51 -               goto out_free;
  52 -
  53 -       if (multicast && sdata->vif.type == NL80211_IFTYPE_AP &&
  54 -           !atomic_read(&sdata->u.ap.num_mcast_sta))
  55 -               goto out_free;
  56 -
  57         if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) &&
  58             test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
  59                 goto out_free;
  60
  61         memset(info, 0, sizeof(*info));
  62
  63 -       if (sta) {
  64 -               tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
  65 -               tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
  66 -               if (tid_tx) {
  67 -                       if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
  68 -                               /* fall back to non-offload slow path */
  69 -                               __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL);
  70 -                               return;
  71 -                       }
  72 -
  73 -                       info->flags |= IEEE80211_TX_CTL_AMPDU;
  74 -                       if (tid_tx->timeout)
  75 -                               tid_tx->last_tx = jiffies;
  76 +       tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
  77 +       tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
  78 +       if (tid_tx) {
  79 +               if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
  80 +                       /* fall back to non-offload slow path */
  81 +                       __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL);
  82 +                       return;
  83                 }
  84 +
  85 +               info->flags |= IEEE80211_TX_CTL_AMPDU;
  86 +               if (tid_tx->timeout)
  87 +                       tid_tx->last_tx = jiffies;
  88         }
  89
  90 -       if (unlikely(!multicast && skb->sk &&
  91 +       if (unlikely(skb->sk &&
  92                      skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS))
  93                 info->ack_frame_id = ieee80211_store_ack_skb(local, skb,
  94                                                              &info->flags, NULL);
  95
  96 -       if (unlikely(sdata->control_port_protocol == ehdr->h_proto)) {
  97 -               if (sdata->control_port_no_encrypt)
  98 -                       info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
  99 -               info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
 100 -       }
 101 -
 102 -       if (multicast)
 103 -               info->flags |= IEEE80211_TX_CTL_NO_ACK;
 104 -
 105         info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
 106
 107         ieee80211_tx_stats(dev, skb->len);
 108
 109 -       if (sta) {
 110 -               sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
 111 -               sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
 112 -       }
 113 +       sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
 114 +       sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
 115
 116         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 117                 sdata = container_of(sdata->bss,
 118 @@ -4286,6 +4245,7 @@ netdev_tx_t ieee80211_subif_start_xmit_8
 119                                             struct net_device *dev)
 120  {
 121         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 122 +       struct ethhdr *ehdr = (struct ethhdr *)skb->data;
 123         struct sta_info *sta;
 124
 125         if (WARN_ON(!sdata->hw_80211_encap)) {
 126 @@ -4302,6 +4262,10 @@ netdev_tx_t ieee80211_subif_start_xmit_8
 127
 128         if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
 129                 kfree_skb(skb);
 130 +       else if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded ||
 131 +                         !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
 132 +                         sdata->control_port_protocol == ehdr->h_proto))
 133 +               ieee80211_subif_start_xmit(skb, dev);
 134         else
 135                 ieee80211_8023_xmit(sdata, dev, sta, skb);
 136