* [PATCH] ath5k: Fix TX/RX padding for all frames [not found] <--to jirislaby@gmail.com --to mickflemm@gmail.com \> @ 2010-02-27 12:58 ` Benoit Papillault 2010-02-27 17:12 ` [ath5k-devel] " Bob Copeland 0 siblings, 1 reply; 4+ messages in thread From: Benoit Papillault @ 2010-02-27 12:58 UTC (permalink / raw) To: jirislaby, mickflemm; +Cc: ath5k-devel, linux-wireless, Benoit Papillault Currently, the padding position is based on ieee80211_get_hdrlen_from_skb(). This is not correct since the HW does padding on RX (and expect the same padding to be present on TX) at the following position : - management : 24 + 6 if 4-addr format - control : 24 + 6 if 4-addr format - data : 24 + 6 if 4-addr format + 2 if QoS - invalid : 24 + 6 if 4-addr format whereas ieee80211_get_hdrlen_from_skb() is : - management : 24 - control : 16 except for ACK/CTS where it is 10 - data : 24 + 6 if 4-addr format + 2 if QoS + 2 if QoS & order - invalid : 24 So, correct frames are not affected : management frames do not use 4-addr format, control frames have no body and invalid frames are ... not valid by definition. However, in order to use monitor interface for debugging purpose, one must be able to send/receive any frames, be it correct or not. Such frames are affected by incorrect padding. Moreover, since padding is added on TX, we need to remove it before calling ieee80211_tx_status. This affect TX packets received by monitor interfaces. It has been tested between an ath5k based card (AR5212) and an ar9170usb based card (netgear WNDA3100) using a frame generator and a monitor interface for each card. Signed-off-by: Benoit Papillault <benoit.papillault@free.fr> --- drivers/net/wireless/ath/ath5k/ath5k.h | 9 +--- drivers/net/wireless/ath/ath5k/base.c | 70 +++++++++++++++++++++++--------- drivers/net/wireless/ath/ath5k/desc.c | 10 +++-- 3 files changed, 59 insertions(+), 30 deletions(-) diff --git a/drivers/net/wireless/ath/ath5k/ath5k.h b/drivers/net/wireless/ath/ath5k/ath5k.h index ac67f02..23543d4 100644 --- a/drivers/net/wireless/ath/ath5k/ath5k.h +++ b/drivers/net/wireless/ath/ath5k/ath5k.h @@ -1141,9 +1141,9 @@ struct ath5k_hw { int (*ah_setup_rx_desc)(struct ath5k_hw *ah, struct ath5k_desc *desc, u32 size, unsigned int flags); int (*ah_setup_tx_desc)(struct ath5k_hw *, struct ath5k_desc *, - unsigned int, unsigned int, enum ath5k_pkt_type, unsigned int, + unsigned int, unsigned int, int, enum ath5k_pkt_type, unsigned int, unsigned int, unsigned int, unsigned int, - unsigned int, unsigned int, unsigned int); + unsigned int, unsigned int, unsigned int, unsigned int); int (*ah_setup_mrr_tx_desc)(struct ath5k_hw *, struct ath5k_desc *, unsigned int, unsigned int, unsigned int, unsigned int, unsigned int, unsigned int); @@ -1370,9 +1370,4 @@ static inline u32 ath5k_hw_bitswap(u32 val, unsigned int bits) return retval; } -static inline int ath5k_pad_size(int hdrlen) -{ - return (hdrlen < 24) ? 0 : hdrlen & 3; -} - #endif diff --git a/drivers/net/wireless/ath/ath5k/base.c b/drivers/net/wireless/ath/ath5k/base.c index 421ef33..d154fb9 100644 --- a/drivers/net/wireless/ath/ath5k/base.c +++ b/drivers/net/wireless/ath/ath5k/base.c @@ -307,7 +307,7 @@ static int ath5k_rxbuf_setup(struct ath5k_softc *sc, struct ath5k_buf *bf); static int ath5k_txbuf_setup(struct ath5k_softc *sc, struct ath5k_buf *bf, - struct ath5k_txq *txq); + struct ath5k_txq *txq, int padsize); static inline void ath5k_txbuf_free(struct ath5k_softc *sc, struct ath5k_buf *bf) { @@ -1272,7 +1272,7 @@ static enum ath5k_pkt_type get_hw_packet_type(struct sk_buff *skb) static int ath5k_txbuf_setup(struct ath5k_softc *sc, struct ath5k_buf *bf, - struct ath5k_txq *txq) + struct ath5k_txq *txq, int padsize) { struct ath5k_hw *ah = sc->ah; struct ath5k_desc *ds = bf->desc; @@ -1324,7 +1324,7 @@ ath5k_txbuf_setup(struct ath5k_softc *sc, struct ath5k_buf *bf, sc->vif, pktlen, info)); } ret = ah->ah_setup_tx_desc(ah, ds, pktlen, - ieee80211_get_hdrlen_from_skb(skb), + ieee80211_get_hdrlen_from_skb(skb), padsize, get_hw_packet_type(skb), (sc->power_level * 2), hw_rate, @@ -1806,6 +1806,25 @@ ath5k_check_ibss_tsf(struct ath5k_softc *sc, struct sk_buff *skb, } } +/* + * Compute padding position. skb must contains an IEEE 802.11 frame + */ +static int ath5k_cmn_padpos(struct sk_buff *skb) +{ + struct ieee80211_hdr * hdr = (struct ieee80211_hdr *)skb->data; + __le16 frame_control = hdr->frame_control; + int padpos = 24; + + if (ieee80211_has_a4(frame_control)) { + padpos += ETH_ALEN; + } + if (ieee80211_is_data_qos(frame_control)) { + padpos += IEEE80211_QOS_CTL_LEN; + } + + return padpos; +} + static void ath5k_tasklet_rx(unsigned long data) { @@ -1819,8 +1838,7 @@ ath5k_tasklet_rx(unsigned long data) struct ath5k_buf *bf; struct ath5k_desc *ds; int ret; - int hdrlen; - int padsize; + int padpos, padsize; int rx_flag; spin_lock(&sc->rxbuflock); @@ -1905,10 +1923,10 @@ accept: * bytes and we can optimize this a bit. In addition, we must * not try to remove padding from short control frames that do * not have payload. */ - hdrlen = ieee80211_get_hdrlen_from_skb(skb); - padsize = ath5k_pad_size(hdrlen); - if (padsize) { - memmove(skb->data + padsize, skb->data, hdrlen); + padpos = ath5k_cmn_padpos(skb); + padsize = padpos & 3; + if (padsize && skb->len>=padpos+padsize) { + memmove(skb->data + padsize, skb->data, padpos); skb_pull(skb, padsize); } rxs = IEEE80211_SKB_RXCB(skb); @@ -1983,6 +2001,7 @@ ath5k_tx_processq(struct ath5k_softc *sc, struct ath5k_txq *txq) struct sk_buff *skb; struct ieee80211_tx_info *info; int i, ret; + int padpos, padsize; spin_lock(&txq->lock); list_for_each_entry_safe(bf, bf0, &txq->q, list) { @@ -2030,6 +2049,17 @@ ath5k_tx_processq(struct ath5k_softc *sc, struct ath5k_txq *txq) info->status.ack_signal = ts.ts_rssi; } + /* + * Remove MAC header padding before giving the frame + * back to mac80211. + */ + padpos = ath5k_cmn_padpos(skb); + padsize = padpos & 3; + if (padsize && skb->len>=padpos+padsize) { + memmove(skb->data + padsize, skb->data, padpos); + skb_pull(skb, padsize); + } + ieee80211_tx_status(sc->hw, skb); spin_lock(&sc->txbuflock); @@ -2073,6 +2103,7 @@ ath5k_beacon_setup(struct ath5k_softc *sc, struct ath5k_buf *bf) int ret = 0; u8 antenna; u32 flags; + const int padsize = 0; bf->skbaddr = pci_map_single(sc->pdev, skb->data, skb->len, PCI_DMA_TODEVICE); @@ -2120,7 +2151,7 @@ ath5k_beacon_setup(struct ath5k_softc *sc, struct ath5k_buf *bf) * from tx power (value is in dB units already) */ ds->ds_data = bf->skbaddr; ret = ah->ah_setup_tx_desc(ah, ds, skb->len, - ieee80211_get_hdrlen_from_skb(skb), + ieee80211_get_hdrlen_from_skb(skb), padsize, AR5K_PKT_TYPE_BEACON, (sc->power_level * 2), ieee80211_get_tx_rate(sc->hw, info)->hw_value, 1, AR5K_TXKEYIX_INVALID, @@ -2680,8 +2711,7 @@ static int ath5k_tx_queue(struct ieee80211_hw *hw, struct sk_buff *skb, struct ath5k_softc *sc = hw->priv; struct ath5k_buf *bf; unsigned long flags; - int hdrlen; - int padsize; + int padpos, padsize; ath5k_debug_dump_skb(sc, skb, "TX ", 1); @@ -2692,17 +2722,19 @@ static int ath5k_tx_queue(struct ieee80211_hw *hw, struct sk_buff *skb, * the hardware expects the header padded to 4 byte boundaries * if this is not the case we add the padding after the header */ - hdrlen = ieee80211_get_hdrlen_from_skb(skb); - padsize = ath5k_pad_size(hdrlen); - if (padsize) { - + padpos = ath5k_cmn_padpos(skb); + padsize = padpos & 3; + if (padsize && skb->len>padpos) { + if (skb_headroom(skb) < padsize) { ATH5K_ERR(sc, "tx hdrlen not %%4: %d not enough" - " headroom to pad %d\n", hdrlen, padsize); + " headroom to pad %d\n", padpos, padsize); goto drop_packet; } skb_push(skb, padsize); - memmove(skb->data, skb->data+padsize, hdrlen); + memmove(skb->data, skb->data+padsize, padpos); + } else { + padsize = 0; } spin_lock_irqsave(&sc->txbuflock, flags); @@ -2721,7 +2753,7 @@ static int ath5k_tx_queue(struct ieee80211_hw *hw, struct sk_buff *skb, bf->skb = skb; - if (ath5k_txbuf_setup(sc, bf, txq)) { + if (ath5k_txbuf_setup(sc, bf, txq, padsize)) { bf->skb = NULL; spin_lock_irqsave(&sc->txbuflock, flags); list_add_tail(&bf->list, &sc->txbuf); diff --git a/drivers/net/wireless/ath/ath5k/desc.c b/drivers/net/wireless/ath/ath5k/desc.c index dc30a2b..d26126b 100644 --- a/drivers/net/wireless/ath/ath5k/desc.c +++ b/drivers/net/wireless/ath/ath5k/desc.c @@ -35,7 +35,8 @@ */ static int ath5k_hw_setup_2word_tx_desc(struct ath5k_hw *ah, struct ath5k_desc *desc, - unsigned int pkt_len, unsigned int hdr_len, enum ath5k_pkt_type type, + unsigned int pkt_len, unsigned int hdr_len, int padsize, + enum ath5k_pkt_type type, unsigned int tx_power, unsigned int tx_rate0, unsigned int tx_tries0, unsigned int key_index, unsigned int antenna_mode, unsigned int flags, unsigned int rtscts_rate, unsigned int rtscts_duration) @@ -71,7 +72,7 @@ ath5k_hw_setup_2word_tx_desc(struct ath5k_hw *ah, struct ath5k_desc *desc, /* Verify and set frame length */ /* remove padding we might have added before */ - frame_len = pkt_len - ath5k_pad_size(hdr_len) + FCS_LEN; + frame_len = pkt_len - padsize + FCS_LEN; if (frame_len & ~AR5K_2W_TX_DESC_CTL0_FRAME_LEN) return -EINVAL; @@ -100,7 +101,7 @@ ath5k_hw_setup_2word_tx_desc(struct ath5k_hw *ah, struct ath5k_desc *desc, AR5K_REG_SM(hdr_len, AR5K_2W_TX_DESC_CTL0_HEADER_LEN); } - /*Diferences between 5210-5211*/ + /*Differences between 5210-5211*/ if (ah->ah_version == AR5K_AR5210) { switch (type) { case AR5K_PKT_TYPE_BEACON: @@ -165,6 +166,7 @@ ath5k_hw_setup_2word_tx_desc(struct ath5k_hw *ah, struct ath5k_desc *desc, */ static int ath5k_hw_setup_4word_tx_desc(struct ath5k_hw *ah, struct ath5k_desc *desc, unsigned int pkt_len, unsigned int hdr_len, + int padsize, enum ath5k_pkt_type type, unsigned int tx_power, unsigned int tx_rate0, unsigned int tx_tries0, unsigned int key_index, unsigned int antenna_mode, unsigned int flags, @@ -206,7 +208,7 @@ static int ath5k_hw_setup_4word_tx_desc(struct ath5k_hw *ah, /* Verify and set frame length */ /* remove padding we might have added before */ - frame_len = pkt_len - ath5k_pad_size(hdr_len) + FCS_LEN; + frame_len = pkt_len - padsize + FCS_LEN; if (frame_len & ~AR5K_4W_TX_DESC_CTL0_FRAME_LEN) return -EINVAL; -- 1.5.6.5 ^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [ath5k-devel] [PATCH] ath5k: Fix TX/RX padding for all frames 2010-02-27 12:58 ` [PATCH] ath5k: Fix TX/RX padding for all frames Benoit Papillault @ 2010-02-27 17:12 ` Bob Copeland 2010-02-27 20:58 ` Benoit PAPILLAULT 0 siblings, 1 reply; 4+ messages in thread From: Bob Copeland @ 2010-02-27 17:12 UTC (permalink / raw) To: Benoit Papillault; +Cc: jirislaby, mickflemm, ath5k-devel, linux-wireless On Sat, Feb 27, 2010 at 01:58:38PM +0100, Benoit Papillault wrote: > Currently, the padding position is based on > ieee80211_get_hdrlen_from_skb(). This is not correct since the HW does > padding on RX (and expect the same padding to be present on TX) at the > following position : > > - management : 24 + 6 if 4-addr format > - control : 24 + 6 if 4-addr format > - data : 24 + 6 if 4-addr format + 2 if QoS > - invalid : 24 + 6 if 4-addr format > > whereas ieee80211_get_hdrlen_from_skb() is : > > - management : 24 > - control : 16 except for ACK/CTS where it is 10 > - data : 24 + 6 if 4-addr format + 2 if QoS + 2 if QoS & order > - invalid : 24 > I still don't get it - if ieee80211_get_header_len_from_skb() returns the wrong thing for 4-addr frames, wouldn't it be better to fix that? The whole problem is the hardware wants the payload 4-byte aligned for the crypto hardware. Anyway, I think the implementation could be simpler. > +static int ath5k_cmn_padpos(struct sk_buff *skb) This needs a better name (common? compute?) > - hdrlen = ieee80211_get_hdrlen_from_skb(skb); > - padsize = ath5k_pad_size(hdrlen); > - if (padsize) { > - memmove(skb->data + padsize, skb->data, hdrlen); > + padpos = ath5k_cmn_padpos(skb); > + padsize = padpos & 3; > + if (padsize && skb->len>=padpos+padsize) { > + memmove(skb->data + padsize, skb->data, padpos); Better would be putting this all in a function and then: ath5k_remove_padding(skb); > + /* > + * Remove MAC header padding before giving the frame > + * back to mac80211. > + */ You get to use the new function you just created here... > @@ -2680,8 +2711,7 @@ static int ath5k_tx_queue(struct ieee80211_hw *hw, struct sk_buff *skb, > struct ath5k_softc *sc = hw->priv; > struct ath5k_buf *bf; > unsigned long flags; > - int hdrlen; > - int padsize; > + int padpos, padsize; > if (skb_headroom(skb) < padsize) { > ATH5K_ERR(sc, "tx hdrlen not %%4: %d not enough" > - " headroom to pad %d\n", hdrlen, padsize); > + " headroom to pad %d\n", padpos, padsize); > goto drop_packet; > } > skb_push(skb, padsize); > - memmove(skb->data, skb->data+padsize, hdrlen); > + memmove(skb->data, skb->data+padsize, padpos); > + } else { > + padsize = 0; > } ath5k_add_padding() > @@ -71,7 +72,7 @@ ath5k_hw_setup_2word_tx_desc(struct ath5k_hw *ah, struct ath5k_desc *desc, > /* Verify and set frame length */ > > /* remove padding we might have added before */ > - frame_len = pkt_len - ath5k_pad_size(hdr_len) + FCS_LEN; > + frame_len = pkt_len - padsize + FCS_LEN; Hrm... I think I added this originally, and I think it is wrong. I have some old docs which say padding doesn't count in txdesc. That simplifies things. -- Bob Copeland %% www.bobcopeland.com ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [ath5k-devel] [PATCH] ath5k: Fix TX/RX padding for all frames 2010-02-27 17:12 ` [ath5k-devel] " Bob Copeland @ 2010-02-27 20:58 ` Benoit PAPILLAULT 2010-02-27 22:05 ` Benoit Papillault 0 siblings, 1 reply; 4+ messages in thread From: Benoit PAPILLAULT @ 2010-02-27 20:58 UTC (permalink / raw) To: Bob Copeland; +Cc: jirislaby, mickflemm, ath5k-devel, linux-wireless Bob Copeland a écrit : > On Sat, Feb 27, 2010 at 01:58:38PM +0100, Benoit Papillault wrote: > >> Currently, the padding position is based on >> ieee80211_get_hdrlen_from_skb(). This is not correct since the HW does >> padding on RX (and expect the same padding to be present on TX) at the >> following position : >> >> - management : 24 + 6 if 4-addr format >> - control : 24 + 6 if 4-addr format >> - data : 24 + 6 if 4-addr format + 2 if QoS >> - invalid : 24 + 6 if 4-addr format >> >> whereas ieee80211_get_hdrlen_from_skb() is : >> >> - management : 24 >> - control : 16 except for ACK/CTS where it is 10 >> - data : 24 + 6 if 4-addr format + 2 if QoS + 2 if QoS & order >> - invalid : 24 >> >> > > I still don't get it - if ieee80211_get_header_len_from_skb() returns > the wrong thing for 4-addr frames, wouldn't it be better to fix that? > No. Both functions serve different purpose : - ieee80211_get_hdrlen_from_skb() is the header length as defined by the IEEE 802.11 specification and AFAIK is correct. - the padding position is what the HW expects, as determined by my own tests. > The whole problem is the hardware wants the payload 4-byte aligned > for the crypto hardware. > > Anyway, I think the implementation could be simpler. > > >> +static int ath5k_cmn_padpos(struct sk_buff *skb) >> > > This needs a better name (common? compute?) > let's say : ath5k_common_padpos ? I just mimic the name used in ath9k. > > >> - hdrlen = ieee80211_get_hdrlen_from_skb(skb); >> - padsize = ath5k_pad_size(hdrlen); >> - if (padsize) { >> - memmove(skb->data + padsize, skb->data, hdrlen); >> + padpos = ath5k_cmn_padpos(skb); >> + padsize = padpos & 3; >> + if (padsize && skb->len>=padpos+padsize) { >> + memmove(skb->data + padsize, skb->data, padpos); >> > > Better would be putting this all in a function and then: > > ath5k_remove_padding(skb); > OK. > >> + /* >> + * Remove MAC header padding before giving the frame >> + * back to mac80211. >> + */ >> > > You get to use the new function you just created here... > > >> @@ -2680,8 +2711,7 @@ static int ath5k_tx_queue(struct ieee80211_hw *hw, struct sk_buff *skb, >> struct ath5k_softc *sc = hw->priv; >> struct ath5k_buf *bf; >> unsigned long flags; >> - int hdrlen; >> - int padsize; >> + int padpos, padsize; >> > > >> if (skb_headroom(skb) < padsize) { >> ATH5K_ERR(sc, "tx hdrlen not %%4: %d not enough" >> - " headroom to pad %d\n", hdrlen, padsize); >> + " headroom to pad %d\n", padpos, padsize); >> goto drop_packet; >> } >> skb_push(skb, padsize); >> - memmove(skb->data, skb->data+padsize, hdrlen); >> + memmove(skb->data, skb->data+padsize, padpos); >> + } else { >> + padsize = 0; >> } >> > > ath5k_add_padding() > OK. > > >> @@ -71,7 +72,7 @@ ath5k_hw_setup_2word_tx_desc(struct ath5k_hw *ah, struct ath5k_desc *desc, >> /* Verify and set frame length */ >> >> /* remove padding we might have added before */ >> - frame_len = pkt_len - ath5k_pad_size(hdr_len) + FCS_LEN; >> + frame_len = pkt_len - padsize + FCS_LEN; >> > > Hrm... I think I added this originally, and I think it is wrong. I have some > old docs which say padding doesn't count in txdesc. That simplifies things. > > > So, you are saying it should be : frame_len = pkt_len + FCS_LEN only? I can test on AR5212, but IIRC, this was affecting the FCS computed by the HW (ie the frame content received on the other side is fined, except the FCS is wrong since it is computed using the more bytes than expected). Regards, Benoit ^ permalink raw reply [flat|nested] 4+ messages in thread
* [PATCH] ath5k: Fix TX/RX padding for all frames 2010-02-27 20:58 ` Benoit PAPILLAULT @ 2010-02-27 22:05 ` Benoit Papillault 0 siblings, 0 replies; 4+ messages in thread From: Benoit Papillault @ 2010-02-27 22:05 UTC (permalink / raw) To: jirislaby, mickflemm; +Cc: ath5k-devel, linux-wireless, Benoit Papillault Currently, the padding position is based on ieee80211_get_hdrlen_from_skb(). This is not correct since the HW does padding on RX (and expect the same padding to be present on TX) at the following position : - management : 24 + 6 if 4-addr format - control : 24 + 6 if 4-addr format - data : 24 + 6 if 4-addr format + 2 if QoS - invalid : 24 + 6 if 4-addr format whereas ieee80211_get_hdrlen_from_skb() is : - management : 24 - control : 16 except for ACK/CTS where it is 10 - data : 24 + 6 if 4-addr format + 2 if QoS + 2 if QoS & order - invalid : 24 So, correct frames are not affected : management frames do not use 4-addr format, control frames have no body and invalid frames are ... not valid by definition. However, in order to use monitor interface for debugging purpose, one must be able to send/receive any frames, be it correct or not. Such frames are affected by incorrect padding. Moreover, since padding is added on TX, we need to remove it before calling ieee80211_tx_status. This affect TX packets received by monitor interfaces. It has been tested between an ath5k based card (AR5212) and an ar9170usb based card (netgear WNDA3100) using a frame generator and a monitor interface for each card. v2: Added ath5k_add_padding / ath5k_remove_padding Signed-off-by: Benoit Papillault <benoit.papillault@free.fr> --- drivers/net/wireless/ath/ath5k/ath5k.h | 9 +-- drivers/net/wireless/ath/ath5k/base.c | 105 ++++++++++++++++++++++++-------- drivers/net/wireless/ath/ath5k/desc.c | 10 ++- 3 files changed, 88 insertions(+), 36 deletions(-) diff --git a/drivers/net/wireless/ath/ath5k/ath5k.h b/drivers/net/wireless/ath/ath5k/ath5k.h index ac67f02..23543d4 100644 --- a/drivers/net/wireless/ath/ath5k/ath5k.h +++ b/drivers/net/wireless/ath/ath5k/ath5k.h @@ -1141,9 +1141,9 @@ struct ath5k_hw { int (*ah_setup_rx_desc)(struct ath5k_hw *ah, struct ath5k_desc *desc, u32 size, unsigned int flags); int (*ah_setup_tx_desc)(struct ath5k_hw *, struct ath5k_desc *, - unsigned int, unsigned int, enum ath5k_pkt_type, unsigned int, + unsigned int, unsigned int, int, enum ath5k_pkt_type, unsigned int, unsigned int, unsigned int, unsigned int, - unsigned int, unsigned int, unsigned int); + unsigned int, unsigned int, unsigned int, unsigned int); int (*ah_setup_mrr_tx_desc)(struct ath5k_hw *, struct ath5k_desc *, unsigned int, unsigned int, unsigned int, unsigned int, unsigned int, unsigned int); @@ -1370,9 +1370,4 @@ static inline u32 ath5k_hw_bitswap(u32 val, unsigned int bits) return retval; } -static inline int ath5k_pad_size(int hdrlen) -{ - return (hdrlen < 24) ? 0 : hdrlen & 3; -} - #endif diff --git a/drivers/net/wireless/ath/ath5k/base.c b/drivers/net/wireless/ath/ath5k/base.c index 421ef33..46e5e6e 100644 --- a/drivers/net/wireless/ath/ath5k/base.c +++ b/drivers/net/wireless/ath/ath5k/base.c @@ -307,7 +307,7 @@ static int ath5k_rxbuf_setup(struct ath5k_softc *sc, struct ath5k_buf *bf); static int ath5k_txbuf_setup(struct ath5k_softc *sc, struct ath5k_buf *bf, - struct ath5k_txq *txq); + struct ath5k_txq *txq, int padsize); static inline void ath5k_txbuf_free(struct ath5k_softc *sc, struct ath5k_buf *bf) { @@ -1272,7 +1272,7 @@ static enum ath5k_pkt_type get_hw_packet_type(struct sk_buff *skb) static int ath5k_txbuf_setup(struct ath5k_softc *sc, struct ath5k_buf *bf, - struct ath5k_txq *txq) + struct ath5k_txq *txq, int padsize) { struct ath5k_hw *ah = sc->ah; struct ath5k_desc *ds = bf->desc; @@ -1324,7 +1324,7 @@ ath5k_txbuf_setup(struct ath5k_softc *sc, struct ath5k_buf *bf, sc->vif, pktlen, info)); } ret = ah->ah_setup_tx_desc(ah, ds, pktlen, - ieee80211_get_hdrlen_from_skb(skb), + ieee80211_get_hdrlen_from_skb(skb), padsize, get_hw_packet_type(skb), (sc->power_level * 2), hw_rate, @@ -1806,6 +1806,67 @@ ath5k_check_ibss_tsf(struct ath5k_softc *sc, struct sk_buff *skb, } } +/* + * Compute padding position. skb must contains an IEEE 802.11 frame + */ +static int ath5k_common_padpos(struct sk_buff *skb) +{ + struct ieee80211_hdr * hdr = (struct ieee80211_hdr *)skb->data; + __le16 frame_control = hdr->frame_control; + int padpos = 24; + + if (ieee80211_has_a4(frame_control)) { + padpos += ETH_ALEN; + } + if (ieee80211_is_data_qos(frame_control)) { + padpos += IEEE80211_QOS_CTL_LEN; + } + + return padpos; +} + +/* + * This function expects a 802.11 frame and returns the number of + * bytes added, or -1 if we don't have enought header room. + */ + +static int ath5k_add_padding(struct sk_buff *skb) +{ + int padpos = ath5k_common_padpos(skb); + int padsize = padpos & 3; + + if (padsize && skb->len>padpos) { + + if (skb_headroom(skb) < padsize) + return -1; + + skb_push(skb, padsize); + memmove(skb->data, skb->data+padsize, padpos); + return padsize; + } + + return 0; +} + +/* + * This function expects a 802.11 frame and returns the number of + * bytes removed + */ + +static int ath5k_remove_padding(struct sk_buff *skb) +{ + int padpos = ath5k_common_padpos(skb); + int padsize = padpos & 3; + + if (padsize && skb->len>=padpos+padsize) { + memmove(skb->data + padsize, skb->data, padpos); + skb_pull(skb, padsize); + return padsize; + } + + return 0; +} + static void ath5k_tasklet_rx(unsigned long data) { @@ -1819,8 +1880,6 @@ ath5k_tasklet_rx(unsigned long data) struct ath5k_buf *bf; struct ath5k_desc *ds; int ret; - int hdrlen; - int padsize; int rx_flag; spin_lock(&sc->rxbuflock); @@ -1905,12 +1964,8 @@ accept: * bytes and we can optimize this a bit. In addition, we must * not try to remove padding from short control frames that do * not have payload. */ - hdrlen = ieee80211_get_hdrlen_from_skb(skb); - padsize = ath5k_pad_size(hdrlen); - if (padsize) { - memmove(skb->data + padsize, skb->data, hdrlen); - skb_pull(skb, padsize); - } + ath5k_remove_padding(skb); + rxs = IEEE80211_SKB_RXCB(skb); /* @@ -2030,6 +2085,12 @@ ath5k_tx_processq(struct ath5k_softc *sc, struct ath5k_txq *txq) info->status.ack_signal = ts.ts_rssi; } + /* + * Remove MAC header padding before giving the frame + * back to mac80211. + */ + ath5k_remove_padding(skb); + ieee80211_tx_status(sc->hw, skb); spin_lock(&sc->txbuflock); @@ -2073,6 +2134,7 @@ ath5k_beacon_setup(struct ath5k_softc *sc, struct ath5k_buf *bf) int ret = 0; u8 antenna; u32 flags; + const int padsize = 0; bf->skbaddr = pci_map_single(sc->pdev, skb->data, skb->len, PCI_DMA_TODEVICE); @@ -2120,7 +2182,7 @@ ath5k_beacon_setup(struct ath5k_softc *sc, struct ath5k_buf *bf) * from tx power (value is in dB units already) */ ds->ds_data = bf->skbaddr; ret = ah->ah_setup_tx_desc(ah, ds, skb->len, - ieee80211_get_hdrlen_from_skb(skb), + ieee80211_get_hdrlen_from_skb(skb), padsize, AR5K_PKT_TYPE_BEACON, (sc->power_level * 2), ieee80211_get_tx_rate(sc->hw, info)->hw_value, 1, AR5K_TXKEYIX_INVALID, @@ -2680,7 +2742,6 @@ static int ath5k_tx_queue(struct ieee80211_hw *hw, struct sk_buff *skb, struct ath5k_softc *sc = hw->priv; struct ath5k_buf *bf; unsigned long flags; - int hdrlen; int padsize; ath5k_debug_dump_skb(sc, skb, "TX ", 1); @@ -2692,17 +2753,11 @@ static int ath5k_tx_queue(struct ieee80211_hw *hw, struct sk_buff *skb, * the hardware expects the header padded to 4 byte boundaries * if this is not the case we add the padding after the header */ - hdrlen = ieee80211_get_hdrlen_from_skb(skb); - padsize = ath5k_pad_size(hdrlen); - if (padsize) { - - if (skb_headroom(skb) < padsize) { - ATH5K_ERR(sc, "tx hdrlen not %%4: %d not enough" - " headroom to pad %d\n", hdrlen, padsize); - goto drop_packet; - } - skb_push(skb, padsize); - memmove(skb->data, skb->data+padsize, hdrlen); + padsize = ath5k_add_padding(skb); + if (padsize < 0) { + ATH5K_ERR(sc, "tx hdrlen not %%4: not enough" + " headroom to pad"); + goto drop_packet; } spin_lock_irqsave(&sc->txbuflock, flags); @@ -2721,7 +2776,7 @@ static int ath5k_tx_queue(struct ieee80211_hw *hw, struct sk_buff *skb, bf->skb = skb; - if (ath5k_txbuf_setup(sc, bf, txq)) { + if (ath5k_txbuf_setup(sc, bf, txq, padsize)) { bf->skb = NULL; spin_lock_irqsave(&sc->txbuflock, flags); list_add_tail(&bf->list, &sc->txbuf); diff --git a/drivers/net/wireless/ath/ath5k/desc.c b/drivers/net/wireless/ath/ath5k/desc.c index dc30a2b..d26126b 100644 --- a/drivers/net/wireless/ath/ath5k/desc.c +++ b/drivers/net/wireless/ath/ath5k/desc.c @@ -35,7 +35,8 @@ */ static int ath5k_hw_setup_2word_tx_desc(struct ath5k_hw *ah, struct ath5k_desc *desc, - unsigned int pkt_len, unsigned int hdr_len, enum ath5k_pkt_type type, + unsigned int pkt_len, unsigned int hdr_len, int padsize, + enum ath5k_pkt_type type, unsigned int tx_power, unsigned int tx_rate0, unsigned int tx_tries0, unsigned int key_index, unsigned int antenna_mode, unsigned int flags, unsigned int rtscts_rate, unsigned int rtscts_duration) @@ -71,7 +72,7 @@ ath5k_hw_setup_2word_tx_desc(struct ath5k_hw *ah, struct ath5k_desc *desc, /* Verify and set frame length */ /* remove padding we might have added before */ - frame_len = pkt_len - ath5k_pad_size(hdr_len) + FCS_LEN; + frame_len = pkt_len - padsize + FCS_LEN; if (frame_len & ~AR5K_2W_TX_DESC_CTL0_FRAME_LEN) return -EINVAL; @@ -100,7 +101,7 @@ ath5k_hw_setup_2word_tx_desc(struct ath5k_hw *ah, struct ath5k_desc *desc, AR5K_REG_SM(hdr_len, AR5K_2W_TX_DESC_CTL0_HEADER_LEN); } - /*Diferences between 5210-5211*/ + /*Differences between 5210-5211*/ if (ah->ah_version == AR5K_AR5210) { switch (type) { case AR5K_PKT_TYPE_BEACON: @@ -165,6 +166,7 @@ ath5k_hw_setup_2word_tx_desc(struct ath5k_hw *ah, struct ath5k_desc *desc, */ static int ath5k_hw_setup_4word_tx_desc(struct ath5k_hw *ah, struct ath5k_desc *desc, unsigned int pkt_len, unsigned int hdr_len, + int padsize, enum ath5k_pkt_type type, unsigned int tx_power, unsigned int tx_rate0, unsigned int tx_tries0, unsigned int key_index, unsigned int antenna_mode, unsigned int flags, @@ -206,7 +208,7 @@ static int ath5k_hw_setup_4word_tx_desc(struct ath5k_hw *ah, /* Verify and set frame length */ /* remove padding we might have added before */ - frame_len = pkt_len - ath5k_pad_size(hdr_len) + FCS_LEN; + frame_len = pkt_len - padsize + FCS_LEN; if (frame_len & ~AR5K_4W_TX_DESC_CTL0_FRAME_LEN) return -EINVAL; -- 1.5.6.5 ^ permalink raw reply related [flat|nested] 4+ messages in thread
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2010-02-27 12:58 ` [PATCH] ath5k: Fix TX/RX padding for all frames Benoit Papillault
2010-02-27 17:12 ` [ath5k-devel] " Bob Copeland
2010-02-27 20:58 ` Benoit PAPILLAULT
2010-02-27 22:05 ` Benoit Papillault
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