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

   1 Index: madwifi-trunk-r3776/ath/if_ath.c
   2 ===================================================================
   3 --- madwifi-trunk-r3776.orig/ath/if_ath.c       2008-07-17 02:23:00.000000000 +0200
   4 +++ madwifi-trunk-r3776/ath/if_ath.c    2008-07-17 02:28:06.000000000 +0200
   5 @@ -3334,7 +3334,6 @@
   6         struct ath_softc *sc = dev->priv;
   7         struct ieee80211_node *ni = NULL;
   8         struct ath_buf *bf = NULL;
   9 -       struct ether_header *eh;
  10         ath_bufhead bf_head;
  11         struct ath_buf *tbf;
  12         struct sk_buff *tskb;
  13 @@ -3349,6 +3348,7 @@
  14         */
  15         int requeue = 0;
  16  #ifdef ATH_SUPERG_FF
  17 +       struct ether_header *eh;
  18         unsigned int pktlen;
  19         struct ieee80211com *ic = &sc->sc_ic;
  20         struct ath_txq *txq = NULL;
  21 Index: madwifi-trunk-r3776/net80211/ieee80211_output.c
  22 ===================================================================
  23 --- madwifi-trunk-r3776.orig/net80211/ieee80211_output.c        2008-07-17 00:21:29.000000000 +0200
  24 +++ madwifi-trunk-r3776/net80211/ieee80211_output.c     2008-07-17 02:35:10.000000000 +0200
  25 @@ -280,7 +280,7 @@
  26          * normal vap. */
  27         if (vap->iv_xrvap && (ni == vap->iv_bss) &&
  28             vap->iv_xrvap->iv_sta_assoc) {
  29 -               struct sk_buff *skb1 = skb_copy(skb, GFP_ATOMIC);
  30 +               struct sk_buff *skb1 = skb_clone(skb, GFP_ATOMIC);
  31                 if (skb1) {
  32                         memset(SKB_CB(skb1), 0, sizeof(struct ieee80211_cb));
  33  #ifdef IEEE80211_DEBUG_REFCNT
  34 @@ -561,7 +561,7 @@
  35         struct ieee80211_key *key, struct sk_buff *skb, int ismulticast)
  36  {
  37         /* XXX pre-calculate per node? */
  38 -       int need_headroom = LLC_SNAPFRAMELEN + hdrsize + IEEE80211_ADDR_LEN;
  39 +       int need_headroom = LLC_SNAPFRAMELEN + hdrsize;
  40         int need_tailroom = 0;
  41  #ifdef ATH_SUPERG_FF
  42         int isff = ATH_FF_MAGIC_PRESENT(skb);
  43 @@ -603,109 +603,56 @@
  44                                 need_tailroom += cip->ic_miclen;
  45         }
  46
  47 -       if (skb_shared(skb)) {
  48 -               /* Take our own reference to the node in the clone */
  49 -               ieee80211_ref_node(SKB_NI(skb));
  50 -               /* Unshare the node, decrementing users in the old skb */
  51 -               skb = skb_unshare(skb, GFP_ATOMIC);
  52 +       need_headroom -= skb_headroom(skb);
  53 +       if (isff)
  54 +               need_tailroom -= skb_tailroom(skb2);
  55 +       else
  56 +               need_tailroom -= skb_tailroom(skb);
  57 +
  58 +       if (need_headroom < 0)
  59 +               need_headroom = 0;
  60 +       if (need_tailroom < 0)
  61 +               need_tailroom = 0;
  62 +
  63 +       if (skb_cloned(skb) || (need_headroom > 0) ||
  64 +               (!isff && (need_tailroom > 0))) {
  65 +
  66 +               if (pskb_expand_head(skb, need_headroom, need_tailroom, GFP_ATOMIC)) {
  67 +                       IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
  68 +                               "%s: cannot expand storage (tail)\n", __func__);
  69 +                       goto error;
  70 +               }
  71         }
  72
  73  #ifdef ATH_SUPERG_FF
  74         if (isff) {
  75 -               if (skb == NULL) {
  76 -                       IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
  77 -                               "%s: cannot unshare for encapsulation\n",
  78 -                               __func__);
  79 -                       vap->iv_stats.is_tx_nobuf++;
  80 -                       ieee80211_dev_kfree_skb(&skb2);
  81 -
  82 -                       return NULL;
  83 -               }
  84 +               inter_headroom -= skb_headroom(skb2);
  85 +               if (inter_headroom < 0)
  86 +                       inter_headroom = 0;
  87 +               if ((skb_cloned(skb2) ||
  88 +                       (inter_headroom > 0) || (need_tailroom > 0))) {
  89
  90 -               /* first skb header */
  91 -               if (skb_headroom(skb) < need_headroom) {
  92 -                       struct sk_buff *tmp = skb;
  93 -                       skb = skb_realloc_headroom(skb, need_headroom);
  94 -                       if (skb == NULL) {
  95 +                       if (pskb_expand_head(skb2, inter_headroom,
  96 +                               need_tailroom, GFP_ATOMIC)) {
  97                                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
  98 -                                       "%s: cannot expand storage (head1)\n",
  99 -                                       __func__);
 100 -                               vap->iv_stats.is_tx_nobuf++;
 101 -                               ieee80211_dev_kfree_skb(&skb2);
 102 -                               return NULL;
 103 -                       } else
 104 -                               ieee80211_skb_copy_noderef(tmp, skb);
 105 -                       ieee80211_dev_kfree_skb(&tmp);
 106 -                       /* NB: cb[] area was copied, but not next ptr. must do that
 107 -                        *     prior to return on success. */
 108 -               }
 109 -
 110 -               /* second skb with header and tail adjustments possible */
 111 -               if (skb_tailroom(skb2) < need_tailroom) {
 112 -                       int n = 0;
 113 -                       if (inter_headroom > skb_headroom(skb2))
 114 -                               n = inter_headroom - skb_headroom(skb2);
 115 -                       if (pskb_expand_head(skb2, n,
 116 -                           need_tailroom - skb_tailroom(skb2), GFP_ATOMIC)) {
 117 -                               ieee80211_dev_kfree_skb(&skb2);
 118 -                               IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
 119 -                                       "%s: cannot expand storage (tail2)\n",
 120 -                                       __func__);
 121 -                               vap->iv_stats.is_tx_nobuf++;
 122 -                               /* this shouldn't happen, but don't send first ff either */
 123 -                               ieee80211_dev_kfree_skb(&skb);
 124 +                                       "%s: cannot expand storage (tail)\n", __func__);
 125 +                               goto error;
 126                         }
 127 -               } else if (skb_headroom(skb2) < inter_headroom) {
 128 -                       struct sk_buff *tmp = skb2;
 129 -
 130 -                       skb2 = skb_realloc_headroom(skb2, inter_headroom);
 131 -                       if (skb2 == NULL) {
 132 -                               IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
 133 -                                       "%s: cannot expand storage (head2)\n",
 134 -                                       __func__);
 135 -                               vap->iv_stats.is_tx_nobuf++;
 136 -                               /* this shouldn't happen, but don't send first ff either */
 137 -                               ieee80211_dev_kfree_skb(&skb);
 138 -                               skb = NULL;
 139 -                       } else
 140 -                               ieee80211_skb_copy_noderef(tmp, skb);
 141 -                       ieee80211_dev_kfree_skb(&tmp);
 142                 }
 143 -               if (skb) {
 144 -                       skb->next = skb2;
 145 -               }
 146 -               return skb;
 147 +               skb->next = skb2;
 148         }
 149  #endif /* ATH_SUPERG_FF */
 150 -       if (skb == NULL) {
 151 -               IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
 152 -                       "%s: cannot unshare for encapsulation\n", __func__);
 153 -               vap->iv_stats.is_tx_nobuf++;
 154 -       } else if (skb_tailroom(skb) < need_tailroom) {
 155 -               int n = 0;
 156 -               if (need_headroom > skb_headroom(skb))
 157 -                       n = need_headroom - skb_headroom(skb);
 158 -               if (pskb_expand_head(skb, n, need_tailroom -
 159 -                                       skb_tailroom(skb), GFP_ATOMIC)) {
 160 -                       IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
 161 -                               "%s: cannot expand storage (tail)\n", __func__);
 162 -                       vap->iv_stats.is_tx_nobuf++;
 163 -                       ieee80211_dev_kfree_skb(&skb);
 164 -               }
 165 -       } else if (skb_headroom(skb) < need_headroom) {
 166 -               struct sk_buff *tmp = skb;
 167 -               skb = skb_realloc_headroom(skb, need_headroom);
 168 -               /* Increment reference count after copy */
 169 -               if (skb == NULL) {
 170 -                       IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
 171 -                               "%s: cannot expand storage (head)\n", __func__);
 172 -                       vap->iv_stats.is_tx_nobuf++;
 173 -               } else
 174 -                       ieee80211_skb_copy_noderef(tmp, skb);
 175 -               ieee80211_dev_kfree_skb(&tmp);
 176 -       }
 177
 178         return skb;
 179 +
 180 +error:
 181 +       vap->iv_stats.is_tx_nobuf++;
 182 +       ieee80211_dev_kfree_skb(&skb);
 183 +#ifdef ATH_SUPERG_FF
 184 +       if (skb2)
 185 +               ieee80211_dev_kfree_skb(&skb2);
 186 +#endif
 187 +       return NULL;
 188  }
 189
 190  #define        KEY_UNDEFINED(k)        ((k).wk_cipher == &ieee80211_cipher_none)
 191 Index: madwifi-trunk-r3776/net80211/ieee80211_input.c
 192 ===================================================================
 193 --- madwifi-trunk-r3776.orig/net80211/ieee80211_input.c 2008-07-17 02:20:52.000000000 +0200
 194 +++ madwifi-trunk-r3776/net80211/ieee80211_input.c      2008-07-17 02:30:28.000000000 +0200
 195 @@ -713,7 +713,7 @@
 196                         /* ether_type must be length as FF frames are always LLC/SNAP encap'd */
 197                         frame_len = ntohs(eh_tmp->ether_type);
 198
 199 -                       skb1 = skb_copy(skb, GFP_ATOMIC);
 200 +                       skb1 = skb_clone(skb, GFP_ATOMIC);
 201                         if (skb1 == NULL)
 202                                 goto err;
 203                         ieee80211_skb_copy_noderef(skb, skb1);
 204 @@ -1118,7 +1118,7 @@
 205
 206                 if (ETHER_IS_MULTICAST(eh->ether_dhost) && !netif_queue_stopped(dev)) {
 207                         /* Create a SKB for the BSS to send out. */
 208 -                       skb1 = skb_copy(skb, GFP_ATOMIC);
 209 +                       skb1 = skb_clone(skb, GFP_ATOMIC);
 210                         if (skb1)
 211                                 SKB_NI(skb1) = ieee80211_ref_node(vap->iv_bss);
 212                 }
 213 @@ -2265,7 +2265,7 @@
 214         if (filter_type && ((vap->app_filter & filter_type) == filter_type)) {
 215                 struct sk_buff *skb1;
 216
 217 -               skb1 = skb_copy(skb, GFP_ATOMIC);
 218 +               skb1 = skb_clone(skb, GFP_ATOMIC);
 219                 if (skb1 == NULL)
 220                         return;
 221                 /* We duplicate the reference after skb_copy */