package/madwifi/patches-r3776/309-performance.patch

   1 --- a/ath/if_ath.c
   2 +++ b/ath/if_ath.c
   3 @@ -3334,7 +3334,6 @@
   4         struct ath_softc *sc = dev->priv;
   5         struct ieee80211_node *ni = NULL;
   6         struct ath_buf *bf = NULL;
   7 -       struct ether_header *eh;
   8         ath_bufhead bf_head;
   9         struct ath_buf *tbf;
  10         struct sk_buff *tskb;
  11 @@ -3349,6 +3348,7 @@
  12         */
  13         int requeue = 0;
  14  #ifdef ATH_SUPERG_FF
  15 +       struct ether_header *eh;
  16         unsigned int pktlen;
  17         struct ieee80211com *ic = &sc->sc_ic;
  18         struct ath_txq *txq = NULL;
  19 --- a/net80211/ieee80211_output.c
  20 +++ b/net80211/ieee80211_output.c
  21 @@ -280,7 +280,7 @@
  22          * normal vap. */
  23         if (vap->iv_xrvap && (ni == vap->iv_bss) &&
  24             vap->iv_xrvap->iv_sta_assoc) {
  25 -               struct sk_buff *skb1 = skb_copy(skb, GFP_ATOMIC);
  26 +               struct sk_buff *skb1 = skb_clone(skb, GFP_ATOMIC);
  27                 if (skb1) {
  28                         memset(SKB_CB(skb1), 0, sizeof(struct ieee80211_cb));
  29  #ifdef IEEE80211_DEBUG_REFCNT
  30 @@ -561,7 +561,7 @@
  31         struct ieee80211_key *key, struct sk_buff *skb, int ismulticast)
  32  {
  33         /* XXX pre-calculate per node? */
  34 -       int need_headroom = LLC_SNAPFRAMELEN + hdrsize + IEEE80211_ADDR_LEN;
  35 +       int need_headroom = LLC_SNAPFRAMELEN + hdrsize;
  36         int need_tailroom = 0;
  37  #ifdef ATH_SUPERG_FF
  38         int isff = ATH_FF_MAGIC_PRESENT(skb);
  39 @@ -603,109 +603,56 @@
  40                                 need_tailroom += cip->ic_miclen;
  41         }
  42
  43 -       if (skb_shared(skb)) {
  44 -               /* Take our own reference to the node in the clone */
  45 -               ieee80211_ref_node(SKB_NI(skb));
  46 -               /* Unshare the node, decrementing users in the old skb */
  47 -               skb = skb_unshare(skb, GFP_ATOMIC);
  48 +       need_headroom -= skb_headroom(skb);
  49 +       if (isff)
  50 +               need_tailroom -= skb_tailroom(skb2);
  51 +       else
  52 +               need_tailroom -= skb_tailroom(skb);
  53 +
  54 +       if (need_headroom < 0)
  55 +               need_headroom = 0;
  56 +       if (need_tailroom < 0)
  57 +               need_tailroom = 0;
  58 +
  59 +       if (skb_cloned(skb) || (need_headroom > 0) ||
  60 +               (!isff && (need_tailroom > 0))) {
  61 +
  62 +               if (pskb_expand_head(skb, need_headroom, need_tailroom, GFP_ATOMIC)) {
  63 +                       IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
  64 +                               "%s: cannot expand storage (tail)\n", __func__);
  65 +                       goto error;
  66 +               }
  67         }
  68
  69  #ifdef ATH_SUPERG_FF
  70         if (isff) {
  71 -               if (skb == NULL) {
  72 -                       IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
  73 -                               "%s: cannot unshare for encapsulation\n",
  74 -                               __func__);
  75 -                       vap->iv_stats.is_tx_nobuf++;
  76 -                       ieee80211_dev_kfree_skb(&skb2);
  77 -
  78 -                       return NULL;
  79 -               }
  80 +               inter_headroom -= skb_headroom(skb2);
  81 +               if (inter_headroom < 0)
  82 +                       inter_headroom = 0;
  83 +               if ((skb_cloned(skb2) ||
  84 +                       (inter_headroom > 0) || (need_tailroom > 0))) {
  85
  86 -               /* first skb header */
  87 -               if (skb_headroom(skb) < need_headroom) {
  88 -                       struct sk_buff *tmp = skb;
  89 -                       skb = skb_realloc_headroom(skb, need_headroom);
  90 -                       if (skb == NULL) {
  91 +                       if (pskb_expand_head(skb2, inter_headroom,
  92 +                               need_tailroom, GFP_ATOMIC)) {
  93                                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
  94 -                                       "%s: cannot expand storage (head1)\n",
  95 -                                       __func__);
  96 -                               vap->iv_stats.is_tx_nobuf++;
  97 -                               ieee80211_dev_kfree_skb(&skb2);
  98 -                               return NULL;
  99 -                       } else
 100 -                               ieee80211_skb_copy_noderef(tmp, skb);
 101 -                       ieee80211_dev_kfree_skb(&tmp);
 102 -                       /* NB: cb[] area was copied, but not next ptr. must do that
 103 -                        *     prior to return on success. */
 104 -               }
 105 -
 106 -               /* second skb with header and tail adjustments possible */
 107 -               if (skb_tailroom(skb2) < need_tailroom) {
 108 -                       int n = 0;
 109 -                       if (inter_headroom > skb_headroom(skb2))
 110 -                               n = inter_headroom - skb_headroom(skb2);
 111 -                       if (pskb_expand_head(skb2, n,
 112 -                           need_tailroom - skb_tailroom(skb2), GFP_ATOMIC)) {
 113 -                               ieee80211_dev_kfree_skb(&skb2);
 114 -                               IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
 115 -                                       "%s: cannot expand storage (tail2)\n",
 116 -                                       __func__);
 117 -                               vap->iv_stats.is_tx_nobuf++;
 118 -                               /* this shouldn't happen, but don't send first ff either */
 119 -                               ieee80211_dev_kfree_skb(&skb);
 120 +                                       "%s: cannot expand storage (tail)\n", __func__);
 121 +                               goto error;
 122                         }
 123 -               } else if (skb_headroom(skb2) < inter_headroom) {
 124 -                       struct sk_buff *tmp = skb2;
 125 -
 126 -                       skb2 = skb_realloc_headroom(skb2, inter_headroom);
 127 -                       if (skb2 == NULL) {
 128 -                               IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
 129 -                                       "%s: cannot expand storage (head2)\n",
 130 -                                       __func__);
 131 -                               vap->iv_stats.is_tx_nobuf++;
 132 -                               /* this shouldn't happen, but don't send first ff either */
 133 -                               ieee80211_dev_kfree_skb(&skb);
 134 -                               skb = NULL;
 135 -                       } else
 136 -                               ieee80211_skb_copy_noderef(tmp, skb);
 137 -                       ieee80211_dev_kfree_skb(&tmp);
 138                 }
 139 -               if (skb) {
 140 -                       skb->next = skb2;
 141 -               }
 142 -               return skb;
 143 +               skb->next = skb2;
 144         }
 145  #endif /* ATH_SUPERG_FF */
 146 -       if (skb == NULL) {
 147 -               IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
 148 -                       "%s: cannot unshare for encapsulation\n", __func__);
 149 -               vap->iv_stats.is_tx_nobuf++;
 150 -       } else if (skb_tailroom(skb) < need_tailroom) {
 151 -               int n = 0;
 152 -               if (need_headroom > skb_headroom(skb))
 153 -                       n = need_headroom - skb_headroom(skb);
 154 -               if (pskb_expand_head(skb, n, need_tailroom -
 155 -                                       skb_tailroom(skb), GFP_ATOMIC)) {
 156 -                       IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
 157 -                               "%s: cannot expand storage (tail)\n", __func__);
 158 -                       vap->iv_stats.is_tx_nobuf++;
 159 -                       ieee80211_dev_kfree_skb(&skb);
 160 -               }
 161 -       } else if (skb_headroom(skb) < need_headroom) {
 162 -               struct sk_buff *tmp = skb;
 163 -               skb = skb_realloc_headroom(skb, need_headroom);
 164 -               /* Increment reference count after copy */
 165 -               if (skb == NULL) {
 166 -                       IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
 167 -                               "%s: cannot expand storage (head)\n", __func__);
 168 -                       vap->iv_stats.is_tx_nobuf++;
 169 -               } else
 170 -                       ieee80211_skb_copy_noderef(tmp, skb);
 171 -               ieee80211_dev_kfree_skb(&tmp);
 172 -       }
 173
 174         return skb;
 175 +
 176 +error:
 177 +       vap->iv_stats.is_tx_nobuf++;
 178 +       ieee80211_dev_kfree_skb(&skb);
 179 +#ifdef ATH_SUPERG_FF
 180 +       if (skb2)
 181 +               ieee80211_dev_kfree_skb(&skb2);
 182 +#endif
 183 +       return NULL;
 184  }
 185
 186  #define        KEY_UNDEFINED(k)        ((k).wk_cipher == &ieee80211_cipher_none)
 187 --- a/net80211/ieee80211_input.c
 188 +++ b/net80211/ieee80211_input.c
 189 @@ -713,7 +713,7 @@
 190                         /* ether_type must be length as FF frames are always LLC/SNAP encap'd */
 191                         frame_len = ntohs(eh_tmp->ether_type);
 192
 193 -                       skb1 = skb_copy(skb, GFP_ATOMIC);
 194 +                       skb1 = skb_clone(skb, GFP_ATOMIC);
 195                         if (skb1 == NULL)
 196                                 goto err;
 197                         ieee80211_skb_copy_noderef(skb, skb1);
 198 @@ -1118,7 +1118,7 @@
 199
 200                 if (ETHER_IS_MULTICAST(eh->ether_dhost) && !netif_queue_stopped(dev)) {
 201                         /* Create a SKB for the BSS to send out. */
 202 -                       skb1 = skb_copy(skb, GFP_ATOMIC);
 203 +                       skb1 = skb_clone(skb, GFP_ATOMIC);
 204                         if (skb1)
 205                                 SKB_NI(skb1) = ieee80211_ref_node(vap->iv_bss);
 206                 }
 207 @@ -2265,7 +2265,7 @@
 208         if (filter_type && ((vap->app_filter & filter_type) == filter_type)) {
 209                 struct sk_buff *skb1;
 210
 211 -               skb1 = skb_copy(skb, GFP_ATOMIC);
 212 +               skb1 = skb_clone(skb, GFP_ATOMIC);
 213                 if (skb1 == NULL)
 214                         return;
 215                 /* We duplicate the reference after skb_copy */