mirror of
https://github.com/proski/madwifi
synced 2024-11-22 06:21:47 +03:00
Tidy RX queue processing code:
* Formatting * Add a function to remove SKB from ath_buf. * Call aforementioned function early if we are accepting a frame, so that there's not chance the data can get stomped on by DMA. We should probably do this for ignored frames as well, but I got fed up trying to sort out the stack of goto. * Remove some KASSERT for skb users, as the SKB are always copied. git-svn-id: http://madwifi-project.org/svn/madwifi/trunk@3594 0192ed92-7a03-0410-a25b-9323aeb14dbd
This commit is contained in:
parent
2ecfeab07e
commit
1b318d3853
219
ath/if_ath.c
219
ath/if_ath.c
@ -180,6 +180,7 @@ static void ath_node_free(struct ieee80211_node *);
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#endif
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static u_int8_t ath_node_getrssi(const struct ieee80211_node *);
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static struct sk_buff *ath_rxbuf_take_skb(struct ath_softc *, struct ath_buf *);
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static int ath_rxbuf_init(struct ath_softc *, struct ath_buf *);
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static void ath_recv_mgmt(struct ieee80211vap *, struct ieee80211_node *,
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struct sk_buff *, int, int, u_int64_t);
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@ -6334,22 +6335,34 @@ ath_alloc_skb(u_int size, u_int align)
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return skb;
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}
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static struct sk_buff *
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ath_rxbuf_take_skb(struct ath_softc *sc, struct ath_buf *bf) {
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struct sk_buff *skb = bf->bf_skb;
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bf->bf_skb = NULL;
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KASSERT(bf->bf_skbaddr, ("bf->bf_skbaddr is 0"));
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bus_unmap_single(sc->sc_bdev, bf->bf_skbaddr,
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sc->sc_rxbufsize, BUS_DMA_FROMDEVICE);
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bf->bf_skbaddr = 0;
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return skb;
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}
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static int
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ath_rxbuf_init(struct ath_softc *sc, struct ath_buf *bf)
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{
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struct ath_hal *ah = sc->sc_ah;
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struct ath_desc *ds = NULL;
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struct sk_buff *skb;
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/* NB: I'm being cautious by unmapping and releasing the SKB every
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* time.
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* XXX: I could probably keep rolling, but the DMA map/unmap logic
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* doesn't seem clean enough and cycling the skb through the free
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* function and slab allocator seems to scrub any un-reset values. */
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if (bf->bf_skb != NULL) {
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KASSERT(bf->bf_skbaddr, ("bf->bf_skbaddr is 0"));
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bus_unmap_single(sc->sc_bdev, bf->bf_skbaddr,
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sc->sc_rxbufsize, BUS_DMA_FROMDEVICE);
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ieee80211_dev_kfree_skb(&bf->bf_skb);
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skb = ath_rxbuf_take_skb(sc, bf);
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ieee80211_dev_kfree_skb(&skb);
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}
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if (!bf->bf_skb) {
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/* NB: Always use the same size for buffer allocations so that
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* dynamically adding a monitor mode VAP to a running driver
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@ -6364,15 +6377,13 @@ ath_rxbuf_init(struct ath_softc *sc, struct ath_buf *bf)
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__func__, size);
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return -ENOMEM;
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}
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/*
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* Reserve space for the header.
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*/
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/* Reserve space for the header. */
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skb_reserve(bf->bf_skb, IEEE80211_MON_MAXHDROOM);
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/*
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* Cache-line-align. This is important (for the
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/* Cache-line-align. This is important (for the
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* 5210 at least) as not doing so causes bogus data
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* in rx'd frames.
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*/
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* in RX'd frames. */
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offset = ((unsigned long)bf->bf_skb->data) % sc->sc_cachelsz;
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if (offset != 0)
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skb_reserve(bf->bf_skb, sc->sc_cachelsz - offset);
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@ -6612,8 +6623,8 @@ ath_rx_tasklet(TQUEUE_ARG data)
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struct ath_desc *ds;
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struct ath_rx_status *rs;
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struct ieee80211_node *ni;
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struct sk_buff* skb;
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unsigned int len, phyerr, mic_fail = 0;
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int is_mcast = 0;
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int type = -1; /* undefined */
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int init_ret = 0;
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int bf_processed = 0;
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@ -6622,27 +6633,27 @@ ath_rx_tasklet(TQUEUE_ARG data)
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DPRINTF(sc, ATH_DEBUG_RX_PROC, "%s started...\n", __func__);
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do {
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/*
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* Get next rx buffer pending processing by rx tasklet...
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/* Get next RX buffer pending processing by RX tasklet...
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*
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* Descriptors are now processed at in the first-level interrupt
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* handler to support U-APSD trigger search. This must also be done
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* even when U-APSD is not active to support other error handling
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* that requires immediate attention. We check bf_status to find
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* out if the bf's descriptors have been processed by the interrupt
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* handler and are ready for this tasklet to consume them. We
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* also never process/remove the self-linked entry at the end
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*/
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* Descriptors are now processed at in the first-level interrupt
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* handler to support U-APSD trigger search. This must also be
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* done even when U-APSD is not active to support other error
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* handling that requires immediate attention. We check
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* bf_status to find out if the bf's descriptors have been
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* processed by the interrupt handler and are ready for this
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* tasklet to consume them. We also never process/remove the
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* self-linked entry at the end. */
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ATH_RXBUF_LOCK_IRQ(sc);
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bf = STAILQ_FIRST(&sc->sc_rxbuf);
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if (bf && (bf->bf_status & ATH_BUFSTATUS_RXDESC_DONE) &&
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(bf->bf_desc->ds_link != bf->bf_daddr))
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(bf->bf_desc->ds_link != bf->bf_daddr))
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STAILQ_REMOVE_HEAD(&sc->sc_rxbuf, bf_list);
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else {
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if(bf && (bf->bf_status & ATH_BUFSTATUS_RXDESC_DONE))
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EPRINTF(sc, "Warning: %s detected a non-empty skb that is self-linked. "
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"This may be a driver bug.\n",
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__func__);
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if (bf && (bf->bf_status & ATH_BUFSTATUS_RXDESC_DONE))
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EPRINTF(sc, "Warning: %s detected a non-empty "
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"skb that is self-linked. "
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"This may be a driver bug.\n",
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__func__);
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bf = NULL;
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}
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ATH_RXBUF_UNLOCK_IRQ(sc);
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@ -6651,8 +6662,6 @@ ath_rx_tasklet(TQUEUE_ARG data)
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bf_processed++;
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ds = bf->bf_desc;
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is_mcast = (((const struct ieee80211_frame*)bf->bf_skb->data)->i_addr1[0] & 0x01) ||
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(((const struct ieee80211_frame*)bf->bf_skb->data)->i_addr3[0] & 0x01);
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#ifdef AR_DEBUG
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if (sc->sc_debug & ATH_DEBUG_RECV_DESC)
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@ -6665,24 +6674,20 @@ ath_rx_tasklet(TQUEUE_ARG data)
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if (len == 0)
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goto rx_next;
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if (rs->rs_more) {
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/*
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* Frame spans multiple descriptors; this
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/* Frame spans multiple descriptors; this
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* cannot happen yet as we don't support
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* jumbograms. If not in monitor mode,
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* discard the frame.
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*/
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* discard the frame. */
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#ifndef ERROR_FRAMES
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/*
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* Enable this if you want to see
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* error frames in Monitor mode.
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*/
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/* Enable this if you want to see
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* error frames in Monitor mode. */
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if (ic->ic_opmode != IEEE80211_M_MONITOR) {
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sc->sc_stats.ast_rx_toobig++;
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errors++;
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goto rx_next;
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}
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#endif
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/* fall thru for monitor mode handling... */
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/* Fall through for monitor mode handling... */
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} else if (rs->rs_status != 0) {
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errors++;
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if (rs->rs_status & HAL_RXERR_CRC)
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@ -6695,16 +6700,14 @@ ath_rx_tasklet(TQUEUE_ARG data)
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sc->sc_stats.ast_rx_phy[phyerr]++;
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}
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if (rs->rs_status & HAL_RXERR_DECRYPT) {
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/*
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* Decrypt error. If the error occurred
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/* Decrypt error. If the error occurred
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* because there was no hardware key, then
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* let the frame through so the upper layers
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* can process it. This is necessary for 5210
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* parts which have no way to setup a ``clear''
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* key cache entry.
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*
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* XXX do key cache faulting
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*/
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* XXX: Do key cache faulting. */
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if (rs->rs_keyix == HAL_RXKEYIX_INVALID)
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goto rx_accept;
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sc->sc_stats.ast_rx_badcrypt++;
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@ -6722,24 +6725,25 @@ ath_rx_tasklet(TQUEUE_ARG data)
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}
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rx_accept:
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skb_accepted++;
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/*
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* Sync and unmap the frame. At this point we're
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* committed to passing the sk_buff somewhere so
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* clear buf_skb; this means a new sk_buff must be
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* allocated when the rx descriptor is setup again
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* to receive another frame.
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*/
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/* Sync and unmap the frame. At this point we're committed
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* to passing the sk_buff somewhere so clear bf_skb; this means
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* a new sk_buff must be allocated when the RX descriptor is
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* setup again to receive another frame.
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* NB: Meta-data (rs, noise, tsf) in the ath_buf is still
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* used. */
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bus_dma_sync_single(sc->sc_bdev,
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bf->bf_skbaddr, len, BUS_DMA_FROMDEVICE);
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skb = ath_rxbuf_take_skb(sc, bf);
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sc->sc_stats.ast_ant_rx[rs->rs_antenna]++;
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sc->sc_devstats.rx_packets++;
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sc->sc_devstats.rx_bytes += len;
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skb_put(bf->bf_skb, len);
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bf->bf_skb->protocol = __constant_htons(ETH_P_CONTROL);
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skb_put(skb, len);
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skb->protocol = __constant_htons(ETH_P_CONTROL);
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ath_capture(dev, bf, bf->bf_skb, bf->bf_tsf, 0 /* RX */);
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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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* before passing to other VAPs. Ignore MIC failures here, as
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@ -6747,22 +6751,22 @@ rx_accept:
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if (rs->rs_status & ~(HAL_RXERR_MIC | HAL_RXERR_DECRYPT))
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goto rx_next;
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/* remove the CRC */
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skb_trim(bf->bf_skb, bf->bf_skb->len - IEEE80211_CRC_LEN);
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/* Remove the CRC. */
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skb_trim(skb, skb->len - IEEE80211_CRC_LEN);
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if (mic_fail) {
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/* Ignore control frames which are reported with MIC
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* error. */
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if ((((struct ieee80211_frame *)bf->bf_skb->data)->i_fc[0] &
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if ((((struct ieee80211_frame *)skb->data)->i_fc[0] &
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IEEE80211_FC0_TYPE_MASK) ==
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IEEE80211_FC0_TYPE_CTL)
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goto drop_micfail;
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ni = ieee80211_find_rxnode(ic, (const struct
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ieee80211_frame_min *)bf->bf_skb->data);
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ieee80211_frame_min *)skb->data);
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if (ni) {
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if (ni->ni_table)
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ieee80211_check_mic(ni, bf->bf_skb);
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ieee80211_check_mic(ni, skb);
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ieee80211_unref_node(&ni);
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}
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@ -6783,17 +6787,16 @@ drop_micfail:
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/* Normal receive. */
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if (IFF_DUMPPKTS(sc, ATH_DEBUG_RECV))
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ieee80211_dump_pkt(ic, bf->bf_skb->data, bf->bf_skb->len,
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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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{
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struct ieee80211_frame * wh =
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(struct ieee80211_frame *) bf->bf_skb->data;
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(struct ieee80211_frame *)skb->data;
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/* only print beacons */
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if ((bf->bf_skb->len >= sizeof(struct ieee80211_frame)) &&
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/* Only print beacons. */
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if ((skb->len >= sizeof(struct ieee80211_frame)) &&
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((wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK)
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== IEEE80211_FC0_TYPE_MGT) &&
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((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK)
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@ -6812,69 +6815,64 @@ drop_micfail:
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* are on-channel. */
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if (!sc->sc_scanning && !(ic->ic_flags & IEEE80211_F_SCAN))
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ATH_RSSI_LPF(sc->sc_halstats.ns_avgrssi, rs->rs_rssi);
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KASSERT((atomic_read(&bf->bf_skb->users) == 1),
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("BAD starting skb reference count!"));
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/*
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* Locate the node for sender, track state, and then
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* pass the (referenced) node up to the 802.11 layer
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* for its use. If the sender is unknown spam the
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* frame; it'll be dropped where it's not wanted.
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*/
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if (rs->rs_keyix != HAL_RXKEYIX_INVALID &&
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/* Locate the node for sender, track state, and then pass the
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* (referenced) node up to the 802.11 layer for its use. If
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* the sender is unknown spam the frame; it'll be dropped
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* where it's not wanted. */
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if ((rs->rs_keyix != HAL_RXKEYIX_INVALID) &&
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(ni = sc->sc_keyixmap[rs->rs_keyix]) != NULL) {
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/* Fast path: node is present in the key map;
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* grab a reference for processing the frame. */
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ni = ieee80211_ref_node(ni);
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type = ieee80211_input(ni->ni_vap, ni, bf->bf_skb, rs->rs_rssi, bf->bf_tsf);
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ieee80211_unref_node(&ni);
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} else {
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/*
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* No key index or no entry, do a lookup and
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* add the node to the mapping table if possible.
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*/
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/* No key index or no entry, do a lookup and
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* add the node to the mapping table if possible. */
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ni = ieee80211_find_rxnode(ic,
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(const struct ieee80211_frame_min *)bf->bf_skb->data);
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(const struct ieee80211_frame_min *)skb->data);
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if (ni != NULL) {
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ieee80211_keyix_t keyix;
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type = ieee80211_input(ni->ni_vap, ni, bf->bf_skb, rs->rs_rssi, bf->bf_tsf);
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/*
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* If the station has a key cache slot assigned
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* update the key->node mapping table.
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*/
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keyix = ni->ni_ucastkey.wk_keyix;
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if (keyix != IEEE80211_KEYIX_NONE &&
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sc->sc_keyixmap[keyix] == NULL)
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sc->sc_keyixmap[keyix] = ieee80211_ref_node(ni);
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ieee80211_unref_node(&ni);
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} else {
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struct ieee80211vap * vap;
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TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
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type = ieee80211_input(vap, NULL, bf->bf_skb, rs->rs_rssi, bf->bf_tsf);
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}
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/* If the station has a key cache slot assigned
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* update the key->node mapping table. */
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ieee80211_keyix_t keyix =
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ni->ni_ucastkey.wk_keyix;
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if ((keyix != IEEE80211_KEYIX_NONE) &&
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(sc->sc_keyixmap[keyix] == NULL))
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sc->sc_keyixmap[keyix] =
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ieee80211_ref_node(ni);
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}
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}
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/* If a node is found, dispatch, else, dispatch to all. */
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if (ni) {
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type = ieee80211_input(ni->ni_vap, ni, skb,
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rs->rs_rssi, bf->bf_tsf);
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ieee80211_unref_node(&ni);
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} else {
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struct ieee80211vap *vap;
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/* Create a new SKB copy for each VAP except the last
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* one, which gets the original SKB. */
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TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
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type = ieee80211_input(vap, NULL, skb,
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rs->rs_rssi, bf->bf_tsf);
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}
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}
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KASSERT((atomic_read(&bf->bf_skb->users) == 1),
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("ieee80211_input changed skb reference count!"));
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if (sc->sc_diversity) {
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/*
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* When using hardware fast diversity, change the default rx
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* antenna if rx diversity chooses the other antenna 3
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* times in a row.
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*/
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/* When using hardware fast diversity, change the default RX
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* antenna if RX diversity chooses the other antenna 3
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* times in a row. */
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if (sc->sc_defant != rs->rs_antenna) {
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if (++sc->sc_rxotherant >= 3)
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ath_setdefantenna(sc, rs->rs_antenna);
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} else
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sc->sc_rxotherant = 0;
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}
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if (sc->sc_softled) {
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/*
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* Blink for any data frame. Otherwise do a
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/* Blink for any data frame. Otherwise do a
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* heartbeat-style blink when idle. The latter
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* is mainly for station mode where we depend on
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* periodic beacon frames to trigger the poll event.
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*/
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* periodic beacon frames to trigger the poll event. */
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if (type == IEEE80211_FC0_TYPE_DATA) {
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sc->sc_rxrate = rs->rs_rate;
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ath_led_event(sc, ATH_LED_RX);
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@ -6883,10 +6881,10 @@ drop_micfail:
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}
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rx_next:
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KASSERT(bf != NULL, ("null bf"));
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KASSERT(bf->bf_skb != NULL, ("null bf->bf_skb"));
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if (0 != (init_ret = ath_rxbuf_init(sc, bf))) {
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EPRINTF(sc, "Failed to reinitialize rxbuf: %d. Lost an RX buffer!\n", init_ret);
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if ((init_ret = ath_rxbuf_init(sc, bf)) != 0) {
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EPRINTF(sc, "Failed to reinitialize rxbuf: %d. "
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"Lost an RX buffer!\n", init_ret);
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break;
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}
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@ -6895,6 +6893,7 @@ rx_next:
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STAILQ_INSERT_TAIL(&sc->sc_rxbuf, bf, bf_list);
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ATH_RXBUF_UNLOCK_IRQ(sc);
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} while (1);
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if (sc->sc_useintmit)
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ath_hal_rxmonitor(ah, &sc->sc_halstats, &sc->sc_curchan);
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if (!bf_processed)
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@ -8514,7 +8513,7 @@ ath_tx_processq(struct ath_softc *sc, struct ath_txq *txq)
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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;
|
||||
DPRINTF(sc, ATH_DEBUG_TX_PROC, "capture/free skb %p\n",
|
||||
DPRINTF(sc, ATH_DEBUG_TX_PROC, "capture skb %p\n",
|
||||
bf->bf_skb);
|
||||
ath_capture(sc->sc_dev, bf, skb, bf->bf_tsf, 1 /* TX */);
|
||||
skb = tskb;
|
||||
@ -8524,7 +8523,7 @@ ath_tx_processq(struct ath_softc *sc, struct ath_txq *txq)
|
||||
* extra buffers */
|
||||
for (i = 0; i < bf->bf_numdescff; i++) {
|
||||
tskb = skb->next;
|
||||
DPRINTF(sc, ATH_DEBUG_TX_PROC, "capture/free skb %p\n",
|
||||
DPRINTF(sc, ATH_DEBUG_TX_PROC, "capture skb %p\n",
|
||||
skb);
|
||||
ath_capture(sc->sc_dev, bf, skb, bf->bf_tsf, 1 /* TX */);
|
||||
skb = tskb;
|
||||
|
@ -213,7 +213,7 @@ ieee80211_input(struct ieee80211vap * vap, struct ieee80211_node *ni_or_null,
|
||||
u_int8_t *bssid;
|
||||
u_int16_t rxseq;
|
||||
|
||||
/* initialize ni as in the previous API */
|
||||
/* Initialize ni as in the previous API. */
|
||||
if (ni_or_null == NULL) {
|
||||
/* This function does not 'own' vap->iv_bss, so we cannot
|
||||
* guarantee its existence during the following call, hence
|
||||
@ -224,11 +224,10 @@ ieee80211_input(struct ieee80211vap * vap, struct ieee80211_node *ni_or_null,
|
||||
KASSERT(ni != NULL, ("null node"));
|
||||
ni->ni_inact = ni->ni_inact_reload;
|
||||
type = -1; /* undefined */
|
||||
/*
|
||||
* In monitor mode, send everything directly to bpf.
|
||||
|
||||
/* In monitor mode, send everything directly to bpf.
|
||||
* Also do not process frames w/o i_addr2 any further.
|
||||
* XXX may want to include the CRC
|
||||
*/
|
||||
* XXX: may want to include the CRC. */
|
||||
if (vap->iv_opmode == IEEE80211_M_MONITOR)
|
||||
goto out;
|
||||
if (original_skb->len < sizeof(struct ieee80211_frame_min)) {
|
||||
@ -252,12 +251,10 @@ ieee80211_input(struct ieee80211vap * vap, struct ieee80211_node *ni_or_null,
|
||||
ieee80211_skb_copy_noderef(original_skb, skb);
|
||||
original_skb = NULL; /* protect caller's skb */
|
||||
|
||||
/*
|
||||
* Bit of a cheat here, we use a pointer for a 3-address
|
||||
/* Bit of a cheat here, we use a pointer for a 3-address
|
||||
* frame format but don't reference fields past outside
|
||||
* ieee80211_frame_min w/o first validating the data is
|
||||
* present.
|
||||
*/
|
||||
* present. */
|
||||
wh = (struct ieee80211_frame *)skb->data;
|
||||
|
||||
if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
|
||||
|
@ -294,7 +294,8 @@ struct ieee80211com {
|
||||
struct net_device *ic_dev; /* associated device */
|
||||
ieee80211com_lock_t ic_comlock; /* state update lock */
|
||||
ieee80211com_lock_t ic_vapslock; /* vap state machine lock */
|
||||
TAILQ_HEAD(, ieee80211vap) ic_vaps; /* list of vap instances */
|
||||
TAILQ_HEAD(ieee80211vap_headtype,
|
||||
ieee80211vap) ic_vaps; /* list of vap instances */
|
||||
enum ieee80211_phytype ic_phytype; /* XXX wrong for multi-mode */
|
||||
enum ieee80211_opmode ic_opmode; /* operation mode */
|
||||
struct ifmedia ic_media; /* interface media config */
|
||||
|
Loading…
Reference in New Issue
Block a user