mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-29 18:19:02 +00:00
264 lines
8.3 KiB
Diff
264 lines
8.3 KiB
Diff
--- a/ath/if_ath.c
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+++ b/ath/if_ath.c
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@@ -3239,7 +3239,6 @@ ath_hardstart(struct sk_buff *skb, struc
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struct ath_softc *sc = dev->priv;
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struct ieee80211_node *ni = NULL;
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struct ath_buf *bf = NULL;
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- struct ether_header *eh;
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ath_bufhead bf_head;
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struct ath_buf *tbf, *tempbf;
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struct sk_buff *tskb;
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@@ -3251,6 +3250,7 @@ ath_hardstart(struct sk_buff *skb, struc
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*/
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int requeue = 0;
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#ifdef ATH_SUPERG_FF
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+ struct ether_header *eh;
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unsigned int pktlen;
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struct ieee80211com *ic = &sc->sc_ic;
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struct ath_node *an;
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@@ -3316,27 +3316,9 @@ ath_hardstart(struct sk_buff *skb, struc
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requeue = 1;
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goto hardstart_fail;
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}
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-#endif
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- /* If the skb data is shared, we will copy it so we can strip padding
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- * without affecting any other bridge ports. */
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- if (skb_cloned(skb)) {
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- /* Remember the original SKB so we can free up our references */
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- struct sk_buff *skb_new;
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- skb_new = skb_copy(skb, GFP_ATOMIC);
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- if (skb_new == NULL) {
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- DPRINTF(sc, ATH_DEBUG_XMIT,
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- "Dropping; skb_copy failure.\n");
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- /* No free RAM, do not requeue! */
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- goto hardstart_fail;
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- }
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- ieee80211_skb_copy_noderef(skb, skb_new);
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- ieee80211_dev_kfree_skb(&skb);
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- skb = skb_new;
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- }
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eh = (struct ether_header *)skb->data;
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-#ifdef ATH_SUPERG_FF
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/* NB: use this lock to protect an->an_tx_ffbuf (and txq->axq_stageq)
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* in athff_can_aggregate() call too. */
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ATH_TXQ_LOCK_IRQ(txq);
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--- a/net80211/ieee80211_output.c
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+++ b/net80211/ieee80211_output.c
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@@ -283,7 +283,7 @@ ieee80211_hardstart(struct sk_buff *skb,
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* normal vap. */
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if (vap->iv_xrvap && (ni == vap->iv_bss) &&
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vap->iv_xrvap->iv_sta_assoc) {
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- struct sk_buff *skb1 = skb_copy(skb, GFP_ATOMIC);
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+ struct sk_buff *skb1 = skb_clone(skb, GFP_ATOMIC);
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if (skb1) {
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memset(SKB_CB(skb1), 0, sizeof(struct ieee80211_cb));
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#ifdef IEEE80211_DEBUG_REFCNT
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@@ -566,7 +566,7 @@ ieee80211_skbhdr_adjust(struct ieee80211
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struct ieee80211_key *key, struct sk_buff *skb, int ismulticast)
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{
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/* XXX pre-calculate per node? */
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- int need_headroom = LLC_SNAPFRAMELEN + hdrsize + IEEE80211_ADDR_LEN;
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+ int need_headroom = LLC_SNAPFRAMELEN + hdrsize;
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int need_tailroom = 0;
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#ifdef ATH_SUPERG_FF
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int isff = ATH_FF_MAGIC_PRESENT(skb);
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@@ -608,109 +608,56 @@ ieee80211_skbhdr_adjust(struct ieee80211
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need_tailroom += cip->ic_miclen;
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}
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- if (skb_shared(skb)) {
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- /* Take our own reference to the node in the clone */
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- ieee80211_ref_node(SKB_CB(skb)->ni);
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- /* Unshare the node, decrementing users in the old skb */
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- skb = skb_unshare(skb, GFP_ATOMIC);
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- }
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+ need_headroom -= skb_headroom(skb);
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+ if (isff)
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+ need_tailroom -= skb_tailroom(skb2);
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+ else
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+ need_tailroom -= skb_tailroom(skb);
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+
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+ if (need_headroom < 0)
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+ need_headroom = 0;
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+ if (need_tailroom < 0)
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+ need_tailroom = 0;
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-#ifdef ATH_SUPERG_FF
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- if (isff) {
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- if (skb == NULL) {
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- IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
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- "%s: cannot unshare for encapsulation\n",
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- __func__);
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- vap->iv_stats.is_tx_nobuf++;
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- ieee80211_dev_kfree_skb(&skb2);
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+ if (skb_cloned(skb) || (need_headroom > 0) ||
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+ (!isff && (need_tailroom > 0))) {
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- return NULL;
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+ if (pskb_expand_head(skb, need_headroom, need_tailroom, GFP_ATOMIC)) {
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+ IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
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+ "%s: cannot expand storage (tail)\n", __func__);
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+ goto error;
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}
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+ }
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- /* first skb header */
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- if (skb_headroom(skb) < need_headroom) {
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- struct sk_buff *tmp = skb;
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- skb = skb_realloc_headroom(skb, need_headroom);
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- if (skb == NULL) {
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- IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
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- "%s: cannot expand storage (head1)\n",
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- __func__);
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- vap->iv_stats.is_tx_nobuf++;
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- ieee80211_dev_kfree_skb(&skb2);
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- return NULL;
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- } else
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- ieee80211_skb_copy_noderef(tmp, skb);
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- ieee80211_dev_kfree_skb(&tmp);
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- /* NB: cb[] area was copied, but not next ptr. must do that
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- * prior to return on success. */
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- }
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+#ifdef ATH_SUPERG_FF
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+ if (isff) {
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+ inter_headroom -= skb_headroom(skb2);
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+ if (inter_headroom < 0)
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+ inter_headroom = 0;
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+ if ((skb_cloned(skb2) ||
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+ (inter_headroom > 0) || (need_tailroom > 0))) {
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- /* second skb with header and tail adjustments possible */
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- if (skb_tailroom(skb2) < need_tailroom) {
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- int n = 0;
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- if (inter_headroom > skb_headroom(skb2))
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- n = inter_headroom - skb_headroom(skb2);
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- if (pskb_expand_head(skb2, n,
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- need_tailroom - skb_tailroom(skb2), GFP_ATOMIC)) {
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- ieee80211_dev_kfree_skb(&skb2);
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+ if (pskb_expand_head(skb2, inter_headroom,
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+ need_tailroom, GFP_ATOMIC)) {
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IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
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- "%s: cannot expand storage (tail2)\n",
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- __func__);
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- vap->iv_stats.is_tx_nobuf++;
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- /* this shouldn't happen, but don't send first ff either */
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- ieee80211_dev_kfree_skb(&skb);
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+ "%s: cannot expand storage (tail)\n", __func__);
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+ goto error;
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}
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- } else if (skb_headroom(skb2) < inter_headroom) {
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- struct sk_buff *tmp = skb2;
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-
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- skb2 = skb_realloc_headroom(skb2, inter_headroom);
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- if (skb2 == NULL) {
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- IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
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- "%s: cannot expand storage (head2)\n",
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- __func__);
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- vap->iv_stats.is_tx_nobuf++;
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- /* this shouldn't happen, but don't send first ff either */
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- ieee80211_dev_kfree_skb(&skb);
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- skb = NULL;
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- } else
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- ieee80211_skb_copy_noderef(tmp, skb);
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- ieee80211_dev_kfree_skb(&tmp);
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- }
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- if (skb) {
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- skb->next = skb2;
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}
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- return skb;
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+ skb->next = skb2;
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}
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#endif /* ATH_SUPERG_FF */
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- if (skb == NULL) {
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- IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
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- "%s: cannot unshare for encapsulation\n", __func__);
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- vap->iv_stats.is_tx_nobuf++;
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- } else if (skb_tailroom(skb) < need_tailroom) {
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- int n = 0;
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- if (need_headroom > skb_headroom(skb))
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- n = need_headroom - skb_headroom(skb);
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- if (pskb_expand_head(skb, n, need_tailroom -
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- skb_tailroom(skb), GFP_ATOMIC)) {
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- IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
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- "%s: cannot expand storage (tail)\n", __func__);
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- vap->iv_stats.is_tx_nobuf++;
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- ieee80211_dev_kfree_skb(&skb);
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- }
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- } else if (skb_headroom(skb) < need_headroom) {
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- struct sk_buff *tmp = skb;
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- skb = skb_realloc_headroom(skb, need_headroom);
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- /* Increment reference count after copy */
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- if (skb == NULL) {
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- IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
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- "%s: cannot expand storage (head)\n", __func__);
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- vap->iv_stats.is_tx_nobuf++;
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- } else
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- ieee80211_skb_copy_noderef(tmp, skb);
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- ieee80211_dev_kfree_skb(&tmp);
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- }
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return skb;
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+
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+error:
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+ vap->iv_stats.is_tx_nobuf++;
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+ ieee80211_dev_kfree_skb(&skb);
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+#ifdef ATH_SUPERG_FF
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+ if (skb2)
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+ ieee80211_dev_kfree_skb(&skb2);
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+#endif
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+ return NULL;
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}
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#define KEY_UNDEFINED(k) ((k).wk_cipher == &ieee80211_cipher_none)
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--- a/net80211/ieee80211_input.c
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+++ b/net80211/ieee80211_input.c
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@@ -204,7 +204,6 @@ ieee80211_input(struct ieee80211vap * va
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struct ieee80211_frame *wh;
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struct ieee80211_key *key;
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struct ether_header *eh;
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- struct sk_buff *skb2;
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#ifdef ATH_SUPERG_FF
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struct llc *llc;
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#endif
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@@ -244,20 +243,6 @@ ieee80211_input(struct ieee80211vap * va
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vap->iv_stats.is_rx_tooshort++;
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goto out;
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}
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- /* Clone the SKB... we assume somewhere in this driver that we 'own'
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- * the skbuff passed into hard start and we do a lot of messing with it
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- * but bridges under some cases will not clone for the first pass of skb
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- * to a bridge port, but will then clone for subsequent ones. This is
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- * odd behavior but it means that if we have trashed the skb we are given
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- * then other ports get clones of the residual garbage.
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- */
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- if ((skb2 = skb_copy(skb, GFP_ATOMIC)) == NULL) {
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- vap->iv_devstats.tx_dropped++;
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- goto out;
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- }
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- ieee80211_skb_copy_noderef(skb, skb2);
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- ieee80211_dev_kfree_skb(&skb);
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- skb = skb2;
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/*
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* Bit of a cheat here, we use a pointer for a 3-address
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@@ -738,7 +723,7 @@ ieee80211_input(struct ieee80211vap * va
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/* ether_type must be length as FF frames are always LLC/SNAP encap'd */
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frame_len = ntohs(eh_tmp->ether_type);
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- skb1 = skb_copy(skb, GFP_ATOMIC);
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+ skb1 = skb_clone(skb, GFP_ATOMIC);
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if (skb1 == NULL)
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goto err;
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ieee80211_skb_copy_noderef(skb, skb1);
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@@ -1137,7 +1122,7 @@ ieee80211_deliver_data(struct ieee80211_
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if (ETHER_IS_MULTICAST(eh->ether_dhost) && !netif_queue_stopped(dev)) {
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/* Create a SKB for the BSS to send out. */
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- skb1 = skb_copy(skb, GFP_ATOMIC);
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+ skb1 = skb_clone(skb, GFP_ATOMIC);
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if (skb1)
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SKB_CB(skb1)->ni = ieee80211_ref_node(vap->iv_bss);
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}
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