package/kernel/mac80211/patches/subsys/325-mac80211-skip-encap-offload-for-tx-multicast-control.patch

   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/iface.c
  14 +++ b/net/mac80211/iface.c
  15 @@ -378,7 +378,8 @@ static bool ieee80211_set_sdata_offload_
  16                         if (key->conf.cipher == WLAN_CIPHER_SUITE_AES_CMAC ||
  17                             key->conf.cipher == WLAN_CIPHER_SUITE_BIP_GMAC_128 ||
  18                             key->conf.cipher == WLAN_CIPHER_SUITE_BIP_GMAC_256 ||
  19 -                           key->conf.cipher == WLAN_CIPHER_SUITE_BIP_CMAC_256)
  20 +                           key->conf.cipher == WLAN_CIPHER_SUITE_BIP_CMAC_256 ||
  21 +                           !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE))
  22                                 continue;
  23                         if (key->conf.cipher == WLAN_CIPHER_SUITE_TKIP ||
  24                             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
  25 @@ -1448,7 +1449,8 @@ static void ieee80211_set_vif_encap_ops(
  26                         if (key->conf.cipher == WLAN_CIPHER_SUITE_AES_CMAC ||
  27                             key->conf.cipher == WLAN_CIPHER_SUITE_BIP_GMAC_128 ||
  28                             key->conf.cipher == WLAN_CIPHER_SUITE_BIP_GMAC_256 ||
  29 -                           key->conf.cipher == WLAN_CIPHER_SUITE_BIP_CMAC_256)
  30 +                           key->conf.cipher == WLAN_CIPHER_SUITE_BIP_CMAC_256 ||
  31 +                           !(key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE))
  32                                 continue;
  33                         if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
  34                                 enabled = false;
  35 --- a/net/mac80211/tx.c
  36 +++ b/net/mac80211/tx.c
  37 @@ -4184,88 +4184,47 @@ static void ieee80211_8023_xmit(struct i
  38                                 struct sk_buff *skb)
  39  {
  40         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  41 -       struct ethhdr *ehdr = (struct ethhdr *)skb->data;
  42         struct ieee80211_local *local = sdata->local;
  43 -       bool authorized = false;
  44 -       bool multicast;
  45 -       unsigned char *ra = ehdr->h_dest;
  46         struct tid_ampdu_tx *tid_tx;
  47         u8 tid;
  48
  49 -       if (IS_ERR(sta) || (sta && !sta->uploaded))
  50 -               sta = NULL;
  51 -
  52 -       if (sdata->vif.type == NL80211_IFTYPE_STATION &&
  53 -           (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER)))
  54 -               ra = sdata->u.mgd.bssid;
  55 -
  56 -       if (is_zero_ether_addr(ra))
  57 -               goto out_free;
  58 -
  59         if (local->ops->wake_tx_queue) {
  60                 u16 queue = __ieee80211_select_queue(sdata, sta, skb);
  61                 skb_set_queue_mapping(skb, queue);
  62                 skb_get_hash(skb);
  63         }
  64
  65 -       multicast = is_multicast_ether_addr(ra);
  66 -
  67 -       if (sta)
  68 -               authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
  69 -
  70 -       if (!multicast && !authorized &&
  71 -           (ehdr->h_proto != sdata->control_port_protocol ||
  72 -            !ether_addr_equal(sdata->vif.addr, ehdr->h_source)))
  73 -               goto out_free;
  74 -
  75 -       if (multicast && sdata->vif.type == NL80211_IFTYPE_AP &&
  76 -           !atomic_read(&sdata->u.ap.num_mcast_sta))
  77 -               goto out_free;
  78 -
  79         if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) &&
  80             test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
  81                 goto out_free;
  82
  83         memset(info, 0, sizeof(*info));
  84
  85 -       if (sta) {
  86 -               tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
  87 -               tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
  88 -               if (tid_tx) {
  89 -                       if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
  90 -                               /* fall back to non-offload slow path */
  91 -                               __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL);
  92 -                               return;
  93 -                       }
  94 -
  95 -                       info->flags |= IEEE80211_TX_CTL_AMPDU;
  96 -                       if (tid_tx->timeout)
  97 -                               tid_tx->last_tx = jiffies;
  98 +       tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
  99 +       tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
 100 +       if (tid_tx) {
 101 +               if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
 102 +                       /* fall back to non-offload slow path */
 103 +                       __ieee80211_subif_start_xmit(skb, dev, 0, 0, NULL);
 104 +                       return;
 105                 }
 106 +
 107 +               info->flags |= IEEE80211_TX_CTL_AMPDU;
 108 +               if (tid_tx->timeout)
 109 +                       tid_tx->last_tx = jiffies;
 110         }
 111
 112 -       if (unlikely(!multicast && skb->sk &&
 113 +       if (unlikely(skb->sk &&
 114                      skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS))
 115                 info->ack_frame_id = ieee80211_store_ack_skb(local, skb,
 116                                                              &info->flags, NULL);
 117
 118 -       if (unlikely(sdata->control_port_protocol == ehdr->h_proto)) {
 119 -               if (sdata->control_port_no_encrypt)
 120 -                       info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 121 -               info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
 122 -       }
 123 -
 124 -       if (multicast)
 125 -               info->flags |= IEEE80211_TX_CTL_NO_ACK;
 126 -
 127         info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
 128
 129         ieee80211_tx_stats(dev, skb->len);
 130
 131 -       if (sta) {
 132 -               sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
 133 -               sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
 134 -       }
 135 +       sta->tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
 136 +       sta->tx_stats.packets[skb_get_queue_mapping(skb)]++;
 137
 138         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 139                 sdata = container_of(sdata->bss,
 140 @@ -4286,6 +4245,7 @@ netdev_tx_t ieee80211_subif_start_xmit_8
 141                                             struct net_device *dev)
 142  {
 143         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 144 +       struct ethhdr *ehdr = (struct ethhdr *)skb->data;
 145         struct sta_info *sta;
 146
 147         if (unlikely(skb->len < ETH_HLEN)) {
 148 @@ -4297,6 +4257,10 @@ netdev_tx_t ieee80211_subif_start_xmit_8
 149
 150         if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
 151                 kfree_skb(skb);
 152 +       else if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded ||
 153 +                         !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
 154 +                         sdata->control_port_protocol == ehdr->h_proto))
 155 +               ieee80211_subif_start_xmit(skb, dev);
 156         else
 157                 ieee80211_8023_xmit(sdata, dev, sta, skb);
 158