From be0418ada3fad110977a9d5fa16d4907d4e7d726 Mon Sep 17 00:00:00 2001 From: Sujith Date: Tue, 18 Nov 2008 09:05:55 +0530 Subject: [PATCH] ath9k: Revamp RX handling Remove a lot of old, crufty code and make RX status reporting a bit sane and clean. Do not do anything to the RX skb before unmapping. So in ath_rx_tasklet(), move the skb_put() after PCI unmap. Signed-off-by: Sujith Signed-off-by: John W. Linville --- drivers/net/wireless/ath9k/core.h | 53 +-- drivers/net/wireless/ath9k/main.c | 100 ------ drivers/net/wireless/ath9k/recv.c | 575 +++++++++++------------------- 3 files changed, 209 insertions(+), 519 deletions(-) diff --git a/drivers/net/wireless/ath9k/core.h b/drivers/net/wireless/ath9k/core.h index fe9dc99cc3e5..5500ef49d8bb 100644 --- a/drivers/net/wireless/ath9k/core.h +++ b/drivers/net/wireless/ath9k/core.h @@ -279,13 +279,6 @@ struct ath_descdma { dma_addr_t dd_dmacontext; }; -/* Abstraction of a received RX MPDU/MMPDU, or a RX fragment */ - -struct ath_rx_context { - struct ath_buf *ctx_rxbuf; /* associated ath_buf for rx */ -}; -#define ATH_RX_CONTEXT(skb) ((struct ath_rx_context *)skb->cb) - int ath_descdma_setup(struct ath_softc *sc, struct ath_descdma *dd, struct list_head *head, @@ -298,61 +291,21 @@ void ath_descdma_cleanup(struct ath_softc *sc, struct ath_descdma *dd, struct list_head *head); -/******/ -/* RX */ -/******/ +/***********/ +/* RX / TX */ +/***********/ #define ATH_MAX_ANTENNA 3 #define ATH_RXBUF 512 #define WME_NUM_TID 16 -/* per frame rx status block */ -struct ath_recv_status { - u64 tsf; /* mac tsf */ - int8_t rssi; /* RSSI (noise floor ajusted) */ - int8_t rssictl[ATH_MAX_ANTENNA]; /* RSSI (noise floor ajusted) */ - int8_t rssiextn[ATH_MAX_ANTENNA]; /* RSSI (noise floor ajusted) */ - int8_t abs_rssi; /* absolute RSSI */ - u8 rateieee; /* data rate received (IEEE rate code) */ - u8 ratecode; /* phy rate code */ - int rateKbps; /* data rate received (Kbps) */ - int antenna; /* rx antenna */ - int flags; /* status of associated skb */ -#define ATH_RX_FCS_ERROR 0x01 -#define ATH_RX_MIC_ERROR 0x02 -#define ATH_RX_DECRYPT_ERROR 0x04 -#define ATH_RX_RSSI_VALID 0x08 -/* if any of ctl,extn chainrssis are valid */ -#define ATH_RX_CHAIN_RSSI_VALID 0x10 -/* if extn chain rssis are valid */ -#define ATH_RX_RSSI_EXTN_VALID 0x20 -/* set if 40Mhz, clear if 20Mhz */ -#define ATH_RX_40MHZ 0x40 -/* set if short GI, clear if full GI */ -#define ATH_RX_SHORT_GI 0x80 -}; - -struct ath_rxbuf { - struct sk_buff *rx_wbuf; - unsigned long rx_time; /* system time when received */ - struct ath_recv_status rx_status; /* cached rx status */ -}; - int ath_startrecv(struct ath_softc *sc); bool ath_stoprecv(struct ath_softc *sc); void ath_flushrecv(struct ath_softc *sc); u32 ath_calcrxfilter(struct ath_softc *sc); -void ath_handle_rx_intr(struct ath_softc *sc); int ath_rx_init(struct ath_softc *sc, int nbufs); void ath_rx_cleanup(struct ath_softc *sc); int ath_rx_tasklet(struct ath_softc *sc, int flush); -int _ath_rx_indicate(struct ath_softc *sc, - struct sk_buff *skb, - struct ath_recv_status *status, - u16 keyix); -/******/ -/* TX */ -/******/ #define ATH_TXBUF 512 /* max number of transmit attempts (tries) */ diff --git a/drivers/net/wireless/ath9k/main.c b/drivers/net/wireless/ath9k/main.c index 60319d7ad24e..c9ac5e8acffa 100644 --- a/drivers/net/wireless/ath9k/main.c +++ b/drivers/net/wireless/ath9k/main.c @@ -236,68 +236,6 @@ static void setup_ht_cap(struct ieee80211_sta_ht_cap *ht_info) ht_info->mcs.tx_params = IEEE80211_HT_MCS_TX_DEFINED; } -static int ath_rate2idx(struct ath_softc *sc, int rate) -{ - int i = 0, cur_band, n_rates; - struct ieee80211_hw *hw = sc->hw; - - cur_band = hw->conf.channel->band; - n_rates = sc->sbands[cur_band].n_bitrates; - - for (i = 0; i < n_rates; i++) { - if (sc->sbands[cur_band].bitrates[i].bitrate == rate) - break; - } - - /* - * NB:mac80211 validates rx rate index against the supported legacy rate - * index only (should be done against ht rates also), return the highest - * legacy rate index for rx rate which does not match any one of the - * supported basic and extended rates to make mac80211 happy. - * The following hack will be cleaned up once the issue with - * the rx rate index validation in mac80211 is fixed. - */ - if (i == n_rates) - return n_rates - 1; - return i; -} - -static void ath9k_rx_prepare(struct ath_softc *sc, - struct sk_buff *skb, - struct ath_recv_status *status, - struct ieee80211_rx_status *rx_status) -{ - struct ieee80211_hw *hw = sc->hw; - struct ieee80211_channel *curchan = hw->conf.channel; - - memset(rx_status, 0, sizeof(struct ieee80211_rx_status)); - - rx_status->mactime = status->tsf; - rx_status->band = curchan->band; - rx_status->freq = curchan->center_freq; - rx_status->noise = sc->sc_ani.sc_noise_floor; - rx_status->signal = rx_status->noise + status->rssi; - rx_status->rate_idx = ath_rate2idx(sc, (status->rateKbps / 100)); - rx_status->antenna = status->antenna; - - /* at 45 you will be able to use MCS 15 reliably. A more elaborate - * scheme can be used here but it requires tables of SNR/throughput for - * each possible mode used. */ - rx_status->qual = status->rssi * 100 / 45; - - /* rssi can be more than 45 though, anything above that - * should be considered at 100% */ - if (rx_status->qual > 100) - rx_status->qual = 100; - - if (status->flags & ATH_RX_MIC_ERROR) - rx_status->flag |= RX_FLAG_MMIC_ERROR; - if (status->flags & ATH_RX_FCS_ERROR) - rx_status->flag |= RX_FLAG_FAILED_FCS_CRC; - - rx_status->flag |= RX_FLAG_TSFT; -} - static void ath9k_ht_conf(struct ath_softc *sc, struct ieee80211_bss_conf *bss_conf) { @@ -440,44 +378,6 @@ void ath_tx_complete(struct ath_softc *sc, struct sk_buff *skb, ieee80211_tx_status(hw, skb); } -int _ath_rx_indicate(struct ath_softc *sc, - struct sk_buff *skb, - struct ath_recv_status *status, - u16 keyix) -{ - struct ieee80211_hw *hw = sc->hw; - struct ieee80211_rx_status rx_status; - struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; - int hdrlen = ieee80211_get_hdrlen_from_skb(skb); - int padsize; - - /* see if any padding is done by the hw and remove it */ - if (hdrlen & 3) { - padsize = hdrlen % 4; - memmove(skb->data + padsize, skb->data, hdrlen); - skb_pull(skb, padsize); - } - - /* Prepare rx status */ - ath9k_rx_prepare(sc, skb, status, &rx_status); - - if (!(keyix == ATH9K_RXKEYIX_INVALID) && - !(status->flags & ATH_RX_DECRYPT_ERROR)) { - rx_status.flag |= RX_FLAG_DECRYPTED; - } else if ((le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_PROTECTED) - && !(status->flags & ATH_RX_DECRYPT_ERROR) - && skb->len >= hdrlen + 4) { - keyix = skb->data[hdrlen + 3] >> 6; - - if (test_bit(keyix, sc->sc_keymap)) - rx_status.flag |= RX_FLAG_DECRYPTED; - } - - __ieee80211_rx(hw, skb, &rx_status); - - return 0; -} - /********************************/ /* LED functions */ /********************************/ diff --git a/drivers/net/wireless/ath9k/recv.c b/drivers/net/wireless/ath9k/recv.c index 2d72ac19fada..000e189e104a 100644 --- a/drivers/net/wireless/ath9k/recv.c +++ b/drivers/net/wireless/ath9k/recv.c @@ -14,10 +14,6 @@ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ -/* - * Implementation of receive path. - */ - #include "core.h" /* @@ -27,10 +23,7 @@ * MAC acknowledges BA status as long as it copies frames to host * buffer (or rx fifo). This can incorrectly acknowledge packets * to a sender if last desc is self-linked. - * - * NOTE: Caller should hold the rxbuf lock. */ - static void ath_rx_buf_link(struct ath_softc *sc, struct ath_buf *bf) { struct ath_hal *ah = sc->sc_ah; @@ -40,19 +33,17 @@ static void ath_rx_buf_link(struct ath_softc *sc, struct ath_buf *bf) ATH_RXBUF_RESET(bf); ds = bf->bf_desc; - ds->ds_link = 0; /* link to null */ + ds->ds_link = 0; /* link to null */ ds->ds_data = bf->bf_buf_addr; - /* XXX For RADAR? - * virtual addr of the beginning of the buffer. */ + /* virtual addr of the beginning of the buffer. */ skb = bf->bf_mpdu; ASSERT(skb != NULL); ds->ds_vdata = skb->data; /* setup rx descriptors */ - ath9k_hw_setuprxdesc(ah, - ds, - skb_tailroom(skb), /* buffer size */ + ath9k_hw_setuprxdesc(ah, ds, + skb_tailroom(skb), /* buffer size */ 0); if (sc->sc_rxlink == NULL) @@ -64,8 +55,7 @@ static void ath_rx_buf_link(struct ath_softc *sc, struct ath_buf *bf) ath9k_hw_rxena(ah); } -static struct sk_buff *ath_rxbuf_alloc(struct ath_softc *sc, - u32 len) +static struct sk_buff *ath_rxbuf_alloc(struct ath_softc *sc, u32 len) { struct sk_buff *skb; u32 off; @@ -91,59 +81,154 @@ static struct sk_buff *ath_rxbuf_alloc(struct ath_softc *sc, return skb; } -static void ath_rx_requeue(struct ath_softc *sc, struct sk_buff *skb) +static void ath_rx_requeue(struct ath_softc *sc, struct ath_buf *bf) { - struct ath_buf *bf = ATH_RX_CONTEXT(skb)->ctx_rxbuf; + struct sk_buff *skb; ASSERT(bf != NULL); - spin_lock_bh(&sc->sc_rxbuflock); - if (bf->bf_status & ATH_BUFSTATUS_STALE) { - /* - * This buffer is still held for hw acess. - * Mark it as free to be re-queued it later. - */ - bf->bf_status |= ATH_BUFSTATUS_FREE; - } else { - /* XXX: we probably never enter here, remove after - * verification */ - list_add_tail(&bf->list, &sc->sc_rxbuf); - ath_rx_buf_link(sc, bf); + if (bf->bf_mpdu == NULL) { + skb = ath_rxbuf_alloc(sc, sc->sc_rxbufsize); + if (skb != NULL) { + bf->bf_mpdu = skb; + bf->bf_buf_addr = pci_map_single(sc->pdev, skb->data, + skb_end_pointer(skb) - skb->head, + PCI_DMA_FROMDEVICE); + bf->bf_dmacontext = bf->bf_buf_addr; + + } } - spin_unlock_bh(&sc->sc_rxbuflock); + + list_move_tail(&bf->list, &sc->sc_rxbuf); + ath_rx_buf_link(sc, bf); +} + + +static int ath_rate2idx(struct ath_softc *sc, int rate) +{ + int i = 0, cur_band, n_rates; + struct ieee80211_hw *hw = sc->hw; + + cur_band = hw->conf.channel->band; + n_rates = sc->sbands[cur_band].n_bitrates; + + for (i = 0; i < n_rates; i++) { + if (sc->sbands[cur_band].bitrates[i].bitrate == rate) + break; + } + + /* + * NB:mac80211 validates rx rate index against the supported legacy rate + * index only (should be done against ht rates also), return the highest + * legacy rate index for rx rate which does not match any one of the + * supported basic and extended rates to make mac80211 happy. + * The following hack will be cleaned up once the issue with + * the rx rate index validation in mac80211 is fixed. + */ + if (i == n_rates) + return n_rates - 1; + + return i; } /* - * The skb indicated to upper stack won't be returned to us. - * So we have to allocate a new one and queue it by ourselves. + * For Decrypt or Demic errors, we only mark packet status here and always push + * up the frame up to let mac80211 handle the actual error case, be it no + * decryption key or real decryption error. This let us keep statistics there. */ -static int ath_rx_indicate(struct ath_softc *sc, - struct sk_buff *skb, - struct ath_recv_status *status, - u16 keyix) +static int ath_rx_prepare(struct sk_buff *skb, struct ath_desc *ds, + struct ieee80211_rx_status *rx_status, bool *decrypt_error, + struct ath_softc *sc) { - struct ath_buf *bf = ATH_RX_CONTEXT(skb)->ctx_rxbuf; - struct sk_buff *nskb; - int type; - - /* indicate frame to the stack, which will free the old skb. */ - type = _ath_rx_indicate(sc, skb, status, keyix); - - /* allocate a new skb and queue it to for H/W processing */ - nskb = ath_rxbuf_alloc(sc, sc->sc_rxbufsize); - if (nskb != NULL) { - bf->bf_mpdu = nskb; - bf->bf_buf_addr = pci_map_single(sc->pdev, nskb->data, - skb_end_pointer(nskb) - nskb->head, - PCI_DMA_FROMDEVICE); - bf->bf_dmacontext = bf->bf_buf_addr; - ATH_RX_CONTEXT(nskb)->ctx_rxbuf = bf; + struct ieee80211_hdr *hdr; + int ratekbps; + u8 ratecode; + __le16 fc; + + hdr = (struct ieee80211_hdr *)skb->data; + fc = hdr->frame_control; + memset(rx_status, 0, sizeof(struct ieee80211_rx_status)); + + if (ds->ds_rxstat.rs_more) { + /* + * Frame spans multiple descriptors; this cannot happen yet + * as we don't support jumbograms. If not in monitor mode, + * discard the frame. Enable this if you want to see + * error frames in Monitor mode. + */ + if (sc->sc_ah->ah_opmode != ATH9K_M_MONITOR) + goto rx_next; + } else if (ds->ds_rxstat.rs_status != 0) { + if (ds->ds_rxstat.rs_status & ATH9K_RXERR_CRC) + rx_status->flag |= RX_FLAG_FAILED_FCS_CRC; + if (ds->ds_rxstat.rs_status & ATH9K_RXERR_PHY) + goto rx_next; - /* queue the new wbuf to H/W */ - ath_rx_requeue(sc, nskb); + if (ds->ds_rxstat.rs_status & ATH9K_RXERR_DECRYPT) { + *decrypt_error = true; + } else if (ds->ds_rxstat.rs_status & ATH9K_RXERR_MIC) { + if (ieee80211_is_ctl(fc)) + /* + * Sometimes, we get invalid + * MIC failures on valid control frames. + * Remove these mic errors. + */ + ds->ds_rxstat.rs_status &= ~ATH9K_RXERR_MIC; + else + rx_status->flag |= RX_FLAG_MMIC_ERROR; + } + /* + * Reject error frames with the exception of + * decryption and MIC failures. For monitor mode, + * we also ignore the CRC error. + */ + if (sc->sc_ah->ah_opmode == ATH9K_M_MONITOR) { + if (ds->ds_rxstat.rs_status & + ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC | + ATH9K_RXERR_CRC)) + goto rx_next; + } else { + if (ds->ds_rxstat.rs_status & + ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC)) { + goto rx_next; + } + } } - return type; + ratecode = ds->ds_rxstat.rs_rate; + ratekbps = sc->sc_hwmap[ratecode].rateKbps; + + /* HT rate */ + if (ratecode & 0x80) { + if (ds->ds_rxstat.rs_flags & ATH9K_RX_2040) + ratekbps = (ratekbps * 27) / 13; + if (ds->ds_rxstat.rs_flags & ATH9K_RX_GI) + ratekbps = (ratekbps * 10) / 9; + } + + rx_status->mactime = ath_extend_tsf(sc, ds->ds_rxstat.rs_tstamp); + rx_status->band = sc->hw->conf.channel->band; + rx_status->freq = sc->hw->conf.channel->center_freq; + rx_status->noise = sc->sc_ani.sc_noise_floor; + rx_status->signal = rx_status->noise + ds->ds_rxstat.rs_rssi; + rx_status->rate_idx = ath_rate2idx(sc, (ratekbps / 100)); + rx_status->antenna = ds->ds_rxstat.rs_antenna; + + /* at 45 you will be able to use MCS 15 reliably. A more elaborate + * scheme can be used here but it requires tables of SNR/throughput for + * each possible mode used. */ + rx_status->qual = ds->ds_rxstat.rs_rssi * 100 / 45; + + /* rssi can be more than 45 though, anything above that + * should be considered at 100% */ + if (rx_status->qual > 100) + rx_status->qual = 100; + + rx_status->flag |= RX_FLAG_TSFT; + + return 1; +rx_next: + return 0; } static void ath_opmode_init(struct ath_softc *sc) @@ -185,12 +270,6 @@ int ath_rx_init(struct ath_softc *sc, int nbufs) sc->sc_flags &= ~SC_OP_RXFLUSH; spin_lock_init(&sc->sc_rxbuflock); - /* - * Cisco's VPN software requires that drivers be able to - * receive encapsulated frames that are larger than the MTU. - * Since we can't be sure how large a frame we'll get, setup - * to handle the larges on possible. - */ sc->sc_rxbufsize = roundup(IEEE80211_MAX_MPDU_LEN, min(sc->sc_cachelsz, (u16)64)); @@ -209,8 +288,6 @@ int ath_rx_init(struct ath_softc *sc, int nbufs) break; } - /* Pre-allocate a wbuf for each rx buffer */ - list_for_each_entry(bf, &sc->sc_rxbuf, list) { skb = ath_rxbuf_alloc(sc, sc->sc_rxbufsize); if (skb == NULL) { @@ -223,7 +300,6 @@ int ath_rx_init(struct ath_softc *sc, int nbufs) skb_end_pointer(skb) - skb->head, PCI_DMA_FROMDEVICE); bf->bf_dmacontext = bf->bf_buf_addr; - ATH_RX_CONTEXT(skb)->ctx_rxbuf = bf; } sc->sc_rxlink = NULL; @@ -235,8 +311,6 @@ int ath_rx_init(struct ath_softc *sc, int nbufs) return error; } -/* Reclaim all rx queue resources */ - void ath_rx_cleanup(struct ath_softc *sc) { struct sk_buff *skb; @@ -248,8 +322,6 @@ void ath_rx_cleanup(struct ath_softc *sc) dev_kfree_skb(skb); } - /* cleanup rx descriptors */ - if (sc->sc_rxdma.dd_desc_len != 0) ath_descdma_cleanup(sc, &sc->sc_rxdma, &sc->sc_rxbuf); } @@ -297,20 +369,19 @@ u32 ath_calcrxfilter(struct ath_softc *sc) } if (sc->sc_ah->ah_opmode == ATH9K_M_STA || - sc->sc_ah->ah_opmode == ATH9K_M_IBSS) + sc->sc_ah->ah_opmode == ATH9K_M_IBSS) rfilt |= ATH9K_RX_FILTER_BEACON; /* If in HOSTAP mode, want to enable reception of PSPOLL frames & beacon frames */ if (sc->sc_ah->ah_opmode == ATH9K_M_HOSTAP) rfilt |= (ATH9K_RX_FILTER_BEACON | ATH9K_RX_FILTER_PSPOLL); + return rfilt; #undef RX_FILTER_PRESERVE } -/* Enable the receive h/w following a reset. */ - int ath_startrecv(struct ath_softc *sc) { struct ath_hal *ah = sc->sc_ah; @@ -322,21 +393,6 @@ int ath_startrecv(struct ath_softc *sc) sc->sc_rxlink = NULL; list_for_each_entry_safe(bf, tbf, &sc->sc_rxbuf, list) { - if (bf->bf_status & ATH_BUFSTATUS_STALE) { - /* restarting h/w, no need for holding descriptors */ - bf->bf_status &= ~ATH_BUFSTATUS_STALE; - /* - * Upper layer may not be done with the frame yet so - * we can't just re-queue it to hardware. Remove it - * from h/w queue. It'll be re-queued when upper layer - * returns the frame and ath_rx_requeue_mpdu is called. - */ - if (!(bf->bf_status & ATH_BUFSTATUS_FREE)) { - list_del(&bf->list); - continue; - } - } - /* chain descriptors */ ath_rx_buf_link(sc, bf); } @@ -346,120 +402,69 @@ int ath_startrecv(struct ath_softc *sc) bf = list_first_entry(&sc->sc_rxbuf, struct ath_buf, list); ath9k_hw_putrxbuf(ah, bf->bf_daddr); - ath9k_hw_rxena(ah); /* enable recv descriptors */ + ath9k_hw_rxena(ah); start_recv: spin_unlock_bh(&sc->sc_rxbuflock); - ath_opmode_init(sc); /* set filters, etc. */ - ath9k_hw_startpcureceive(ah); /* re-enable PCU/DMA engine */ + ath_opmode_init(sc); + ath9k_hw_startpcureceive(ah); + return 0; } -/* Disable the receive h/w in preparation for a reset. */ - bool ath_stoprecv(struct ath_softc *sc) { struct ath_hal *ah = sc->sc_ah; - u64 tsf; bool stopped; - ath9k_hw_stoppcurecv(ah); /* disable PCU */ - ath9k_hw_setrxfilter(ah, 0); /* clear recv filter */ - stopped = ath9k_hw_stopdmarecv(ah); /* disable DMA engine */ - mdelay(3); /* 3ms is long enough for 1 frame */ - tsf = ath9k_hw_gettsf64(ah); - sc->sc_rxlink = NULL; /* just in case */ + ath9k_hw_stoppcurecv(ah); + ath9k_hw_setrxfilter(ah, 0); + stopped = ath9k_hw_stopdmarecv(ah); + mdelay(3); /* 3ms is long enough for 1 frame */ + sc->sc_rxlink = NULL; + return stopped; } -/* Flush receive queue */ - void ath_flushrecv(struct ath_softc *sc) { - /* - * ath_rx_tasklet may be used to handle rx interrupt and flush receive - * queue at the same time. Use a lock to serialize the access of rx - * queue. - * ath_rx_tasklet cannot hold the spinlock while indicating packets. - * Instead, do not claim the spinlock but check for a flush in - * progress (see references to sc_rxflush) - */ spin_lock_bh(&sc->sc_rxflushlock); sc->sc_flags |= SC_OP_RXFLUSH; - ath_rx_tasklet(sc, 1); - sc->sc_flags &= ~SC_OP_RXFLUSH; spin_unlock_bh(&sc->sc_rxflushlock); } -/* Process receive queue, as well as LED, etc. */ - int ath_rx_tasklet(struct ath_softc *sc, int flush) { #define PA2DESC(_sc, _pa) \ ((struct ath_desc *)((caddr_t)(_sc)->sc_rxdma.dd_desc + \ ((_pa) - (_sc)->sc_rxdma.dd_desc_paddr))) - struct ath_buf *bf, *bf_held = NULL; + struct ath_buf *bf; struct ath_desc *ds; - struct ieee80211_hdr *hdr; struct sk_buff *skb = NULL; - struct ath_recv_status rx_status; + struct ieee80211_rx_status rx_status; struct ath_hal *ah = sc->sc_ah; - int type, rx_processed = 0; - u32 phyerr; - u8 chainreset = 0; - int retval; - __le16 fc; + struct ieee80211_hdr *hdr; + int hdrlen, padsize, retval; + bool decrypt_error = false; + u8 keyix; + + spin_lock_bh(&sc->sc_rxbuflock); do { /* If handling rx interrupt and flush is in progress => exit */ if ((sc->sc_flags & SC_OP_RXFLUSH) && (flush == 0)) break; - spin_lock_bh(&sc->sc_rxbuflock); if (list_empty(&sc->sc_rxbuf)) { sc->sc_rxlink = NULL; - spin_unlock_bh(&sc->sc_rxbuflock); break; } bf = list_first_entry(&sc->sc_rxbuf, struct ath_buf, list); - - /* - * There is a race condition that BH gets scheduled after sw - * writes RxE and before hw re-load the last descriptor to get - * the newly chained one. Software must keep the last DONE - * descriptor as a holding descriptor - software does so by - * marking it with the STALE flag. - */ - if (bf->bf_status & ATH_BUFSTATUS_STALE) { - bf_held = bf; - if (list_is_last(&bf_held->list, &sc->sc_rxbuf)) { - /* - * The holding descriptor is the last - * descriptor in queue. It's safe to - * remove the last holding descriptor - * in BH context. - */ - list_del(&bf_held->list); - bf_held->bf_status &= ~ATH_BUFSTATUS_STALE; - sc->sc_rxlink = NULL; - - if (bf_held->bf_status & ATH_BUFSTATUS_FREE) { - list_add_tail(&bf_held->list, - &sc->sc_rxbuf); - ath_rx_buf_link(sc, bf_held); - } - spin_unlock_bh(&sc->sc_rxbuflock); - break; - } - bf = list_entry(bf->list.next, struct ath_buf, list); - } - ds = bf->bf_desc; - ++rx_processed; /* * Must provide the virtual address of the current @@ -472,8 +477,7 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush) * on. All this is necessary because of our use of * a self-linked list to avoid rx overruns. */ - retval = ath9k_hw_rxprocdesc(ah, - ds, + retval = ath9k_hw_rxprocdesc(ah, ds, bf->bf_daddr, PA2DESC(sc, ds->ds_link), 0); @@ -482,7 +486,7 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush) struct ath_desc *tds; if (list_is_last(&bf->list, &sc->sc_rxbuf)) { - spin_unlock_bh(&sc->sc_rxbuflock); + sc->sc_rxlink = NULL; break; } @@ -500,215 +504,70 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush) */ tds = tbf->bf_desc; - retval = ath9k_hw_rxprocdesc(ah, - tds, tbf->bf_daddr, - PA2DESC(sc, tds->ds_link), 0); + retval = ath9k_hw_rxprocdesc(ah, tds, tbf->bf_daddr, + PA2DESC(sc, tds->ds_link), 0); if (retval == -EINPROGRESS) { - spin_unlock_bh(&sc->sc_rxbuflock); break; } } - /* XXX: we do not support frames spanning - * multiple descriptors */ - bf->bf_status |= ATH_BUFSTATUS_DONE; - skb = bf->bf_mpdu; - if (skb == NULL) { /* XXX ??? can this happen */ - spin_unlock_bh(&sc->sc_rxbuflock); + if (!skb) continue; - } - /* - * Now we know it's a completed frame, we can indicate the - * frame. Remove the previous holding descriptor and leave - * this one in the queue as the new holding descriptor. - */ - if (bf_held) { - list_del(&bf_held->list); - bf_held->bf_status &= ~ATH_BUFSTATUS_STALE; - if (bf_held->bf_status & ATH_BUFSTATUS_FREE) { - list_add_tail(&bf_held->list, &sc->sc_rxbuf); - /* try to requeue this descriptor */ - ath_rx_buf_link(sc, bf_held); - } - } - bf->bf_status |= ATH_BUFSTATUS_STALE; - bf_held = bf; /* - * Release the lock here in case ieee80211_input() return - * the frame immediately by calling ath_rx_mpdu_requeue(). + * If we're asked to flush receive queue, directly + * chain it back at the queue without processing it. */ - spin_unlock_bh(&sc->sc_rxbuflock); - - if (flush) { - /* - * If we're asked to flush receive queue, directly - * chain it back at the queue without processing it. - */ + if (flush) goto rx_next; - } - hdr = (struct ieee80211_hdr *)skb->data; - fc = hdr->frame_control; - memset(&rx_status, 0, sizeof(struct ath_recv_status)); - - if (ds->ds_rxstat.rs_more) { - /* - * Frame spans multiple descriptors; this - * cannot happen yet as we don't support - * jumbograms. If not in monitor mode, - * discard the frame. - */ -#ifndef ERROR_FRAMES - /* - * Enable this if you want to see - * error frames in Monitor mode. - */ - if (sc->sc_ah->ah_opmode != ATH9K_M_MONITOR) - goto rx_next; -#endif - /* fall thru for monitor mode handling... */ - } else if (ds->ds_rxstat.rs_status != 0) { - if (ds->ds_rxstat.rs_status & ATH9K_RXERR_CRC) - rx_status.flags |= ATH_RX_FCS_ERROR; - if (ds->ds_rxstat.rs_status & ATH9K_RXERR_PHY) { - phyerr = ds->ds_rxstat.rs_phyerr & 0x1f; - goto rx_next; - } + if (!ds->ds_rxstat.rs_datalen) + goto rx_next; - if (ds->ds_rxstat.rs_status & ATH9K_RXERR_DECRYPT) { - /* - * Decrypt error. We only mark packet status - * here and always push up the frame up to let - * mac80211 handle the actual error case, be - * it no decryption key or real decryption - * error. This let us keep statistics there. - */ - rx_status.flags |= ATH_RX_DECRYPT_ERROR; - } else if (ds->ds_rxstat.rs_status & ATH9K_RXERR_MIC) { - /* - * Demic error. We only mark frame status here - * and always push up the frame up to let - * mac80211 handle the actual error case. This - * let us keep statistics there. Hardware may - * post a false-positive MIC error. - */ - if (ieee80211_is_ctl(fc)) - /* - * Sometimes, we get invalid - * MIC failures on valid control frames. - * Remove these mic errors. - */ - ds->ds_rxstat.rs_status &= - ~ATH9K_RXERR_MIC; - else - rx_status.flags |= ATH_RX_MIC_ERROR; - } - /* - * Reject error frames with the exception of - * decryption and MIC failures. For monitor mode, - * we also ignore the CRC error. - */ - if (sc->sc_ah->ah_opmode == ATH9K_M_MONITOR) { - if (ds->ds_rxstat.rs_status & - ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC | - ATH9K_RXERR_CRC)) - goto rx_next; - } else { - if (ds->ds_rxstat.rs_status & - ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC)) { - goto rx_next; - } - } - } - /* - * The status portion of the descriptor could get corrupted. - */ + /* The status portion of the descriptor could get corrupted. */ if (sc->sc_rxbufsize < ds->ds_rxstat.rs_datalen) goto rx_next; - /* - * Sync and unmap the frame. At this point we're - * committed to passing the sk_buff somewhere so - * clear buf_skb; this means a new sk_buff must be - * allocated when the rx descriptor is setup again - * to receive another frame. - */ - skb_put(skb, ds->ds_rxstat.rs_datalen); - skb->protocol = cpu_to_be16(ETH_P_CONTROL); - rx_status.tsf = ath_extend_tsf(sc, ds->ds_rxstat.rs_tstamp); - rx_status.rateieee = - sc->sc_hwmap[ds->ds_rxstat.rs_rate].ieeerate; - rx_status.rateKbps = - sc->sc_hwmap[ds->ds_rxstat.rs_rate].rateKbps; - rx_status.ratecode = ds->ds_rxstat.rs_rate; - - /* HT rate */ - if (rx_status.ratecode & 0x80) { - /* TODO - add table to avoid division */ - if (ds->ds_rxstat.rs_flags & ATH9K_RX_2040) { - rx_status.flags |= ATH_RX_40MHZ; - rx_status.rateKbps = - (rx_status.rateKbps * 27) / 13; - } - if (ds->ds_rxstat.rs_flags & ATH9K_RX_GI) - rx_status.rateKbps = - (rx_status.rateKbps * 10) / 9; - else - rx_status.flags |= ATH_RX_SHORT_GI; - } - /* sc_noise_floor is only available when the station - attaches to an AP, so we use a default value - if we are not yet attached. */ - rx_status.abs_rssi = - ds->ds_rxstat.rs_rssi + sc->sc_ani.sc_noise_floor; + if (!ath_rx_prepare(skb, ds, &rx_status, &decrypt_error, sc)) + goto rx_next; - pci_dma_sync_single_for_cpu(sc->pdev, - bf->bf_buf_addr, + /* Sync and unmap the frame */ + pci_dma_sync_single_for_cpu(sc->pdev, bf->bf_buf_addr, skb_tailroom(skb), PCI_DMA_FROMDEVICE); - pci_unmap_single(sc->pdev, - bf->bf_buf_addr, + pci_unmap_single(sc->pdev, bf->bf_buf_addr, sc->sc_rxbufsize, PCI_DMA_FROMDEVICE); - /* XXX: Ah! make me more readable, use a helper */ - if (ah->ah_caps.hw_caps & ATH9K_HW_CAP_HT) { - if (ds->ds_rxstat.rs_moreaggr == 0) { - rx_status.rssictl[0] = - ds->ds_rxstat.rs_rssi_ctl0; - rx_status.rssictl[1] = - ds->ds_rxstat.rs_rssi_ctl1; - rx_status.rssictl[2] = - ds->ds_rxstat.rs_rssi_ctl2; - rx_status.rssi = ds->ds_rxstat.rs_rssi; - if (ds->ds_rxstat.rs_flags & ATH9K_RX_2040) { - rx_status.rssiextn[0] = - ds->ds_rxstat.rs_rssi_ext0; - rx_status.rssiextn[1] = - ds->ds_rxstat.rs_rssi_ext1; - rx_status.rssiextn[2] = - ds->ds_rxstat.rs_rssi_ext2; - rx_status.flags |= - ATH_RX_RSSI_EXTN_VALID; - } - rx_status.flags |= ATH_RX_RSSI_VALID | - ATH_RX_CHAIN_RSSI_VALID; - } - } else { - /* - * Need to insert the "combined" rssi into the - * status structure for upper layer processing - */ - rx_status.rssi = ds->ds_rxstat.rs_rssi; - rx_status.flags |= ATH_RX_RSSI_VALID; + skb_put(skb, ds->ds_rxstat.rs_datalen); + skb->protocol = cpu_to_be16(ETH_P_CONTROL); + + /* see if any padding is done by the hw and remove it */ + hdr = (struct ieee80211_hdr *)skb->data; + hdrlen = ieee80211_get_hdrlen_from_skb(skb); + + if (hdrlen & 3) { + padsize = hdrlen % 4; + memmove(skb->data + padsize, skb->data, hdrlen); + skb_pull(skb, padsize); } - /* Pass frames up to the stack. */ + keyix = ds->ds_rxstat.rs_keyix; - type = ath_rx_indicate(sc, skb, - &rx_status, ds->ds_rxstat.rs_keyix); + if (!(keyix == ATH9K_RXKEYIX_INVALID) && !decrypt_error) { + rx_status.flag |= RX_FLAG_DECRYPTED; + } else if ((le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_PROTECTED) + && !decrypt_error && skb->len >= hdrlen + 4) { + keyix = skb->data[hdrlen + 3] >> 6; + + if (test_bit(keyix, sc->sc_keymap)) + rx_status.flag |= RX_FLAG_DECRYPTED; + } + + /* Send the frame to mac80211 */ + __ieee80211_rx(sc->hw, skb, &rx_status); + bf->bf_mpdu = NULL; /* * change the default rx antenna if rx diversity chooses the @@ -716,37 +575,15 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush) */ if (sc->sc_defant != ds->ds_rxstat.rs_antenna) { if (++sc->sc_rxotherant >= 3) - ath_setdefantenna(sc, - ds->ds_rxstat.rs_antenna); + ath_setdefantenna(sc, ds->ds_rxstat.rs_antenna); } else { sc->sc_rxotherant = 0; } - -#ifdef CONFIG_SLOW_ANT_DIV - if ((rx_status.flags & ATH_RX_RSSI_VALID) && - ieee80211_is_beacon(fc)) { - ath_slow_ant_div(&sc->sc_antdiv, hdr, &ds->ds_rxstat); - } -#endif - /* - * For frames successfully indicated, the buffer will be - * returned to us by upper layers by calling - * ath_rx_mpdu_requeue, either synchronusly or asynchronously. - * So we don't want to do it here in this loop. - */ - continue; - rx_next: - bf->bf_status |= ATH_BUFSTATUS_FREE; - } while (TRUE); - - if (chainreset) { - DPRINTF(sc, ATH_DBG_CONFIG, - "%s: Reset rx chain mask. " - "Do internal reset\n", __func__); - ASSERT(flush == 0); - ath_reset(sc, false); - } + ath_rx_requeue(sc, bf); + } while (1); + + spin_unlock_bh(&sc->sc_rxbuflock); return 0; #undef PA2DESC -- GitLab