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https://github.com/proski/madwifi
synced 2024-11-21 22:11:32 +03:00
Move responsibility for removing padding in the RX path entirely to the driver. This allows it to be done once, and thus avoids extra copying of SKBs.
git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@3713 0192ed92-7a03-0410-a25b-9323aeb14dbd
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mentor
parent
c47c360b48
commit
be5b0e727a
67
ath/if_ath.c
67
ath/if_ath.c
@ -6320,66 +6320,36 @@ ath_rxbuf_init(struct ath_softc *sc, struct ath_buf *bf)
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/* This function calculates the presence of, and then removes any padding
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* bytes between the frame header and frame body, and returns a modified
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* SKB. If padding is removed and copy_skb is specified, then a new SKB is
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* created, otherwise the same SKB is used.
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*
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* NB: MAY ALLOCATE */
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static struct sk_buff *
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ath_skb_removepad(struct sk_buff *skb, unsigned int copy_skb)
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* SKB. */
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static void
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ath_skb_removepad(struct ieee80211com *ic, struct sk_buff *skb)
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{
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struct sk_buff *tskb = skb;
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struct ieee80211_frame *wh = (struct ieee80211_frame *)skb->data;
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unsigned int padbytes = 0, headersize = 0;
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KASSERT(ic->ic_flags & IEEE80211_F_DATAPAD,
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("data padding not enabled?"));
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/* Only non-control frames have bodies, and hence padding. */
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if (IEEE80211_FRM_HAS_BODY(wh)) {
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headersize = ieee80211_anyhdrsize(wh);
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padbytes = roundup(headersize, 4) - headersize;
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if (padbytes > 0) {
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if (copy_skb) {
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/* Copy skb and remove HW pad bytes */
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tskb = skb_copy(skb, GFP_ATOMIC);
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if (tskb == NULL)
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return NULL;
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ieee80211_skb_copy_noderef(skb, tskb);
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}
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memmove(tskb->data + padbytes, tskb->data, headersize);
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skb_pull(tskb, padbytes);
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memmove(skb->data + padbytes, skb->data, headersize);
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skb_pull(skb, padbytes);
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}
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}
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return tskb;
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}
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/*
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* Add a prism2 header to a received frame and
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* dispatch it to capture tools like kismet.
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*/
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static void
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static __inline void
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ath_capture(struct net_device *dev, const struct ath_buf *bf,
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struct sk_buff *skb, u_int64_t tsf, unsigned int tx)
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{
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struct ath_softc *sc = dev->priv;
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struct ieee80211com *ic = &sc->sc_ic;
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struct sk_buff *tskb = NULL;
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KASSERT(ic->ic_flags & IEEE80211_F_DATAPAD,
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("data padding not enabled?"));
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if (sc->sc_nmonvaps <= 0)
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return;
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/* Never copy the SKB, as it is ours on the RX side, and this is the
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* last process on the TX side and we only modify our own headers. */
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tskb = ath_skb_removepad(skb, !tx /* Copy SKB */);
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if (tskb == NULL) {
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DPRINTF(sc, ATH_DEBUG_ANY,
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"Dropping; ath_skb_removepad failed!\n");
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return;
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}
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ieee80211_input_monitor(ic, tskb, bf, tx, tsf, sc);
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if (tskb != skb)
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ieee80211_dev_kfree_skb(&tskb);
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if (sc->sc_nmonvaps > 0)
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ieee80211_input_monitor(ic, skb, bf, tx, tsf, sc);
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}
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/*
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@ -6640,6 +6610,7 @@ rx_accept:
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skb_put(skb, len);
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skb->protocol = __constant_htons(ETH_P_CONTROL);
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ath_skb_removepad(ic, skb);
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ath_capture(dev, bf, skb, bf->bf_tsf, 0 /* RX */);
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/* Finished monitor mode handling, now reject error frames
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@ -6684,7 +6655,7 @@ rx_accept:
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if (IFF_DUMPPKTS(sc, ATH_DEBUG_RECV))
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ieee80211_dump_pkt(ic, skb->data, skb->len,
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sc->sc_hwmap[rs->rs_rate].ieeerate,
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rs->rs_rssi);
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rs->rs_rssi, 0);
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{
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struct ieee80211_frame *wh =
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@ -7973,7 +7944,7 @@ ath_tx_start(struct net_device *dev, struct ieee80211_node *ni,
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if (IFF_DUMPPKTS(sc, ATH_DEBUG_XMIT))
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/* FFXXX: need multi-skb version to dump entire FF */
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ieee80211_dump_pkt(ic, skb->data, skb->len,
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sc->sc_hwmap[txrate].ieeerate, -1);
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sc->sc_hwmap[txrate].ieeerate, -1, 1);
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/*
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* Determine if a tx interrupt should be generated for
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@ -8354,11 +8325,12 @@ ath_tx_processq(struct ath_softc *sc, struct ath_txq *txq)
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unsigned int i;
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#endif
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/* ath_capture modifies skb data; must be last process
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* in TX path. */
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tskb = skb->next;
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/* HW is now finished with the SKB, so it is safe to
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* remove padding. */
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ath_skb_removepad(&sc->sc_ic, skb);
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DPRINTF(sc, ATH_DEBUG_TX_PROC, "capture skb %p\n",
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bf->bf_skb);
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tskb = skb->next;
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ath_capture(sc->sc_dev, bf, skb, bf->bf_tsf, 1 /* TX */);
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skb = tskb;
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@ -8366,9 +8338,10 @@ ath_tx_processq(struct ath_softc *sc, struct ath_txq *txq)
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/* Handle every skb after the first one - these are FF
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* extra buffers */
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for (i = 0; i < bf->bf_numdescff; i++) {
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tskb = skb->next;
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ath_skb_removepad(&sc->sc_ic, skb); /* XXX: padding for FF? */
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DPRINTF(sc, ATH_DEBUG_TX_PROC, "capture skb %p\n",
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skb);
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tskb = skb->next;
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ath_capture(sc->sc_dev, bf, skb, bf->bf_tsf, 1 /* TX */);
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skb = tskb;
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}
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@ -207,7 +207,7 @@ ieee80211_input(struct ieee80211vap *vap, struct ieee80211_node *ni_or_null,
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#ifdef ATH_SUPERG_FF
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struct llc *llc;
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#endif
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int hdrspace;
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int hdrlen;
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u_int8_t dir, type = -1, subtype;
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u_int8_t *bssid;
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u_int16_t rxseq;
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@ -431,11 +431,11 @@ ieee80211_input(struct ieee80211vap *vap, struct ieee80211_node *ni_or_null,
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switch (type) {
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case IEEE80211_FC0_TYPE_DATA:
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hdrspace = ieee80211_hdrspace(ic, wh);
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if (skb->len < hdrspace) {
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hdrlen = ieee80211_hdrsize(wh);
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if (skb->len < hdrlen) {
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IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
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wh, "data", "too short: len %u, expecting %u",
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skb->len, hdrspace);
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skb->len, hdrlen);
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vap->iv_stats.is_rx_tooshort++;
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goto out; /* XXX */
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}
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@ -624,7 +624,7 @@ ieee80211_input(struct ieee80211vap *vap, struct ieee80211_node *ni_or_null,
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IEEE80211_NODE_STAT(ni, rx_noprivacy);
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goto out;
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}
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key = ieee80211_crypto_decap(ni, skb, hdrspace);
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key = ieee80211_crypto_decap(ni, skb, hdrlen);
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if (key == NULL) {
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/* NB: stats+msgs handled in crypto_decap */
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IEEE80211_NODE_STAT(ni, rx_wepfail);
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@ -639,7 +639,7 @@ ieee80211_input(struct ieee80211vap *vap, struct ieee80211_node *ni_or_null,
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* Next up, any fragmentation.
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*/
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if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
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skb = ieee80211_defrag(ni, skb, hdrspace);
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skb = ieee80211_defrag(ni, skb, hdrlen);
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if (skb == NULL) {
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/* Fragment dropped or frame not complete yet */
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goto out;
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@ -651,7 +651,7 @@ ieee80211_input(struct ieee80211vap *vap, struct ieee80211_node *ni_or_null,
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* Next strip any MSDU crypto bits.
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*/
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if (key != NULL &&
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!ieee80211_crypto_demic(vap, key, skb, hdrspace, 0)) {
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!ieee80211_crypto_demic(vap, key, skb, hdrlen, 0)) {
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IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
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ni->ni_macaddr, "data", "%s", "demic error");
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IEEE80211_NODE_STAT(ni, rx_demicfail);
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@ -661,7 +661,7 @@ ieee80211_input(struct ieee80211vap *vap, struct ieee80211_node *ni_or_null,
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/*
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* Finally, strip the 802.11 header.
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*/
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skb = ieee80211_decap(vap, skb, hdrspace);
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skb = ieee80211_decap(vap, skb, hdrlen);
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if (skb == NULL) {
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/* don't count Null data frames as errors */
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if (subtype == IEEE80211_FC0_SUBTYPE_NODATA)
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@ -812,8 +812,8 @@ ieee80211_input(struct ieee80211vap *vap, struct ieee80211_node *ni_or_null,
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vap->iv_stats.is_rx_noprivacy++;
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goto out;
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}
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hdrspace = ieee80211_hdrspace(ic, wh);
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key = ieee80211_crypto_decap(ni, skb, hdrspace);
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hdrlen = ieee80211_hdrsize(wh);
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key = ieee80211_crypto_decap(ni, skb, hdrlen);
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if (key == NULL) {
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/* NB: stats+msgs handled in crypto_decap */
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goto out;
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@ -4245,8 +4245,7 @@ ieee80211_check_mic(struct ieee80211_node *ni, struct sk_buff *skb)
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struct ieee80211vap *vap = ni->ni_vap;
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struct ieee80211_frame *wh;
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struct ieee80211_key *key;
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int hdrspace;
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struct ieee80211com *ic = vap->iv_ic;
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int hdrlen;
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if (skb->len < sizeof(struct ieee80211_frame_min)) {
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IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
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@ -4257,13 +4256,13 @@ ieee80211_check_mic(struct ieee80211_node *ni, struct sk_buff *skb)
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}
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wh = (struct ieee80211_frame *)skb->data;
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hdrspace = ieee80211_hdrspace(ic, wh);
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hdrlen = ieee80211_hdrsize(wh);
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key = ieee80211_crypto_decap(ni, skb, hdrspace);
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key = ieee80211_crypto_decap(ni, skb, hdrlen);
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if (key == NULL) {
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/* NB: stats+msgs handled in crypto_decap */
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IEEE80211_NODE_STAT(ni, rx_wepfail);
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} else if (!ieee80211_crypto_demic(vap, key, skb, hdrspace, 1)) {
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} else if (!ieee80211_crypto_demic(vap, key, skb, hdrlen, 1)) {
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IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
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ni->ni_macaddr, "data", "%s", "demic error");
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IEEE80211_NODE_STAT(ni, rx_demicfail);
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@ -224,7 +224,8 @@ ieee80211_pwrsave(struct sk_buff *skb)
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ni->ni_stats.ns_psq_drops, IEEE80211_PS_MAX_QUEUE);
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#ifdef IEEE80211_DEBUG
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if (ieee80211_msg_dumppkts(vap))
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ieee80211_dump_pkt(ni->ni_ic, skb->data, skb->len, -1, -1);
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ieee80211_dump_pkt(ni->ni_ic, skb->data,
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skb->len, -1, -1, 1);
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#endif
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if (SKB_NI(skb) != NULL)
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ieee80211_unref_node(&SKB_NI(skb));
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@ -313,8 +313,8 @@ ieee80211_print_essid(const u_int8_t *essid, int len)
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EXPORT_SYMBOL(ieee80211_print_essid);
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void
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ieee80211_dump_pkt(struct ieee80211com *ic,
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const u_int8_t *buf, int len, int rate, int rssi)
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ieee80211_dump_pkt(struct ieee80211com *ic, const u_int8_t *buf,
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int len, int rate, int rssi, int tx)
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{
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const struct ieee80211_frame *wh;
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int i;
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@ -365,7 +365,10 @@ ieee80211_dump_pkt(struct ieee80211com *ic,
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if (wh->i_fc[1] & IEEE80211_FC1_PROT) {
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int off;
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off = ieee80211_anyhdrspace(ic, wh);
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if (tx)
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off = ieee80211_anyhdrspace(ic, wh);
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else
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off = ieee80211_anyhdrsize(wh);
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printk(" Prot. [IV %.02x %.02x %.02x",
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buf[off + 0], buf[off + 1], buf[off + 2]);
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if (buf[off + IEEE80211_WEP_IVLEN] & IEEE80211_WEP_EXTIV)
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@ -252,7 +252,8 @@ void ieee80211_dturbo_switch(struct ieee80211com *, int);
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int ieee80211_new_state(struct ieee80211vap *, enum ieee80211_state, int);
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void ieee80211_print_essid(const u_int8_t *, int);
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#ifdef IEEE80211_DEBUG
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void ieee80211_dump_pkt(struct ieee80211com *, const u_int8_t *, int, int, int);
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void ieee80211_dump_pkt(struct ieee80211com *, const u_int8_t *,
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int, int, int, int);
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#else
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#define ieee80211_dump_pkt(...)
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#endif
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