atheros: define shared bssidmask setting
Also make ath5k and ath9k use it, and share register definitions. Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
parent
e5aa847489
commit
13b8155920
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@ -3,4 +3,7 @@ obj-$(CONFIG_ATH9K) += ath9k/
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obj-$(CONFIG_AR9170_USB) += ar9170/
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obj-$(CONFIG_ATH_COMMON) += ath.o
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ath-objs := main.o regd.o
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ath-objs := main.o \
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regd.o \
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hw.o
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@ -45,6 +45,7 @@ struct ath_ops {
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};
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struct ath_common {
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void *ah;
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u16 cachelsz;
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u16 curaid;
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u8 macaddr[ETH_ALEN];
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@ -58,4 +59,6 @@ struct sk_buff *ath_rxbuf_alloc(struct ath_common *common,
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u32 len,
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gfp_t gfp_mask);
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void ath_hw_setbssidmask(struct ath_common *common);
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#endif /* ATH_H */
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@ -1192,7 +1192,7 @@ extern int ath5k_hw_set_opmode(struct ath5k_hw *ah);
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/* BSSID Functions */
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extern int ath5k_hw_set_lladdr(struct ath5k_hw *ah, const u8 *mac);
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extern void ath5k_hw_set_associd(struct ath5k_hw *ah, const u8 *bssid, u16 assoc_id);
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extern int ath5k_hw_set_bssid_mask(struct ath5k_hw *ah, const u8 *mask);
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extern void ath5k_hw_set_bssid_mask(struct ath5k_hw *ah, const u8 *mask);
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/* Receive start/stop functions */
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extern void ath5k_hw_start_rx_pcu(struct ath5k_hw *ah);
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extern void ath5k_hw_stop_rx_pcu(struct ath5k_hw *ah);
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@ -104,7 +104,7 @@ static int ath5k_hw_post(struct ath5k_hw *ah)
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int ath5k_hw_attach(struct ath5k_softc *sc)
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{
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struct ath5k_hw *ah = sc->ah;
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struct ath_common *common;
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struct ath_common *common = ath5k_hw_common(ah);
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struct pci_dev *pdev = sc->pdev;
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struct ath5k_eeprom_info *ee;
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int ret;
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@ -593,6 +593,7 @@ ath5k_pci_probe(struct pci_dev *pdev,
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sc->ah->ah_iobase = sc->iobase;
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common = ath5k_hw_common(sc->ah);
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common->ops = &ath5k_common_ops;
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common->ah = sc->ah;
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common->cachelsz = csz << 2; /* convert to bytes */
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/* Initialize device */
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@ -560,8 +560,8 @@ static const struct ath5k_ini ar5212_ini_common_start[] = {
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{ AR5K_SLEEP0, 0x0002aaaa },
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{ AR5K_SLEEP1, 0x02005555 },
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{ AR5K_SLEEP2, 0x00000000 },
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{ AR5K_BSS_IDM0, 0xffffffff },
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{ AR5K_BSS_IDM1, 0x0000ffff },
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{ AR_BSSMSKL, 0xffffffff },
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{ AR_BSSMSKU, 0x0000ffff },
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{ AR5K_TXPC, 0x00000000 },
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{ AR5K_PROFCNT_TX, 0x00000000 },
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{ AR5K_PROFCNT_RX, 0x00000000 },
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@ -290,10 +290,10 @@ void ath5k_hw_set_associd(struct ath5k_hw *ah, const u8 *bssid, u16 assoc_id)
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*/
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if (ah->ah_version == AR5K_AR5212) {
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ath5k_hw_reg_write(ah, get_unaligned_le32(common->bssidmask),
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AR5K_BSS_IDM0);
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AR_BSSMSKL);
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ath5k_hw_reg_write(ah,
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get_unaligned_le16(common->curbssid + 4),
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AR5K_BSS_IDM1);
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AR_BSSMSKU);
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}
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/*
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@ -301,9 +301,9 @@ void ath5k_hw_set_associd(struct ath5k_hw *ah, const u8 *bssid, u16 assoc_id)
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*/
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low_id = get_unaligned_le32(bssid);
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high_id = get_unaligned_le16(bssid);
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ath5k_hw_reg_write(ah, low_id, AR5K_BSS_ID0);
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ath5k_hw_reg_write(ah, low_id, AR_BSSMSKL);
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ath5k_hw_reg_write(ah, high_id | ((assoc_id & 0x3fff) <<
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AR5K_BSS_ID1_AID_S), AR5K_BSS_ID1);
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AR5K_BSS_ID1_AID_S), AR_BSSMSKU);
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if (assoc_id == 0) {
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ath5k_hw_disable_pspoll(ah);
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@ -316,125 +316,18 @@ void ath5k_hw_set_associd(struct ath5k_hw *ah, const u8 *bssid, u16 assoc_id)
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ath5k_hw_enable_pspoll(ah, NULL, 0);
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}
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/**
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* ath5k_hw_set_bssid_mask - filter out bssids we listen
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*
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* @ah: the &struct ath5k_hw
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* @mask: the bssid_mask, a u8 array of size ETH_ALEN
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*
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* BSSID masking is a method used by AR5212 and newer hardware to inform PCU
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* which bits of the interface's MAC address should be looked at when trying
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* to decide which packets to ACK. In station mode and AP mode with a single
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* BSS every bit matters since we lock to only one BSS. In AP mode with
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* multiple BSSes (virtual interfaces) not every bit matters because hw must
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* accept frames for all BSSes and so we tweak some bits of our mac address
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* in order to have multiple BSSes.
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*
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* NOTE: This is a simple filter and does *not* filter out all
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* relevant frames. Some frames that are not for us might get ACKed from us
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* by PCU because they just match the mask.
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*
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* When handling multiple BSSes you can get the BSSID mask by computing the
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* set of ~ ( MAC XOR BSSID ) for all bssids we handle.
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*
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* When you do this you are essentially computing the common bits of all your
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* BSSes. Later it is assumed the harware will "and" (&) the BSSID mask with
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* the MAC address to obtain the relevant bits and compare the result with
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* (frame's BSSID & mask) to see if they match.
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*/
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/*
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* Simple example: on your card you have have two BSSes you have created with
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* BSSID-01 and BSSID-02. Lets assume BSSID-01 will not use the MAC address.
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* There is another BSSID-03 but you are not part of it. For simplicity's sake,
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* assuming only 4 bits for a mac address and for BSSIDs you can then have:
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*
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* \
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* MAC: 0001 |
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* BSSID-01: 0100 | --> Belongs to us
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* BSSID-02: 1001 |
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* /
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* -------------------
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* BSSID-03: 0110 | --> External
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* -------------------
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*
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* Our bssid_mask would then be:
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*
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* On loop iteration for BSSID-01:
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* ~(0001 ^ 0100) -> ~(0101)
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* -> 1010
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* bssid_mask = 1010
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*
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* On loop iteration for BSSID-02:
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* bssid_mask &= ~(0001 ^ 1001)
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* bssid_mask = (1010) & ~(0001 ^ 1001)
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* bssid_mask = (1010) & ~(1001)
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* bssid_mask = (1010) & (0110)
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* bssid_mask = 0010
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*
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* A bssid_mask of 0010 means "only pay attention to the second least
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* significant bit". This is because its the only bit common
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* amongst the MAC and all BSSIDs we support. To findout what the real
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* common bit is we can simply "&" the bssid_mask now with any BSSID we have
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* or our MAC address (we assume the hardware uses the MAC address).
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*
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* Now, suppose there's an incoming frame for BSSID-03:
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*
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* IFRAME-01: 0110
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*
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* An easy eye-inspeciton of this already should tell you that this frame
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* will not pass our check. This is beacuse the bssid_mask tells the
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* hardware to only look at the second least significant bit and the
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* common bit amongst the MAC and BSSIDs is 0, this frame has the 2nd LSB
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* as 1, which does not match 0.
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*
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* So with IFRAME-01 we *assume* the hardware will do:
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*
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* allow = (IFRAME-01 & bssid_mask) == (bssid_mask & MAC) ? 1 : 0;
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* --> allow = (0110 & 0010) == (0010 & 0001) ? 1 : 0;
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* --> allow = (0010) == 0000 ? 1 : 0;
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* --> allow = 0
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*
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* Lets now test a frame that should work:
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*
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* IFRAME-02: 0001 (we should allow)
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*
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* allow = (0001 & 1010) == 1010
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*
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* allow = (IFRAME-02 & bssid_mask) == (bssid_mask & MAC) ? 1 : 0;
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* --> allow = (0001 & 0010) == (0010 & 0001) ? 1 :0;
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* --> allow = (0010) == (0010)
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* --> allow = 1
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*
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* Other examples:
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*
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* IFRAME-03: 0100 --> allowed
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* IFRAME-04: 1001 --> allowed
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* IFRAME-05: 1101 --> allowed but its not for us!!!
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*
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*/
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int ath5k_hw_set_bssid_mask(struct ath5k_hw *ah, const u8 *mask)
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void ath5k_hw_set_bssid_mask(struct ath5k_hw *ah, const u8 *mask)
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{
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struct ath_common *common = ath5k_hw_common(ah);
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u32 low_id, high_id;
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ATH5K_TRACE(ah->ah_sc);
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/* Cache bssid mask so that we can restore it
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* on reset */
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memcpy(common->bssidmask, mask, ETH_ALEN);
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if (ah->ah_version == AR5K_AR5212) {
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low_id = get_unaligned_le32(mask);
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high_id = get_unaligned_le16(mask + 4);
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ath5k_hw_reg_write(ah, low_id, AR5K_BSS_IDM0);
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ath5k_hw_reg_write(ah, high_id, AR5K_BSS_IDM1);
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return 0;
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if (ah->ah_version == AR5K_AR5212)
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ath_hw_setbssidmask(common);
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}
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return -EIO;
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}
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/************\
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* RX Control *
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\************/
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@ -35,7 +35,7 @@
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* released by Atheros and on various debug messages found on the net.
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*/
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#include "../reg.h"
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/*====MAC DMA REGISTERS====*/
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@ -1649,12 +1649,6 @@
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#define AR5K_SLEEP2_DTIM_PER 0xffff0000 /* Mask for DTIM period (?) */
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#define AR5K_SLEEP2_DTIM_PER_S 16
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/*
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* BSSID mask registers
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*/
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#define AR5K_BSS_IDM0 0x80e0 /* Upper bits */
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#define AR5K_BSS_IDM1 0x80e4 /* Lower bits */
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/*
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* TX power control (TPC) register
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*
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@ -2441,7 +2441,7 @@ int ath9k_hw_reset(struct ath_hw *ah, struct ath9k_channel *chan,
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| ah->sta_id1_defaults);
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ath9k_hw_set_operating_mode(ah, ah->opmode);
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ath9k_hw_setbssidmask(ah);
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ath_hw_setbssidmask(common);
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REG_WRITE(ah, AR_DEF_ANTENNA, saveDefAntenna);
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@ -3990,14 +3990,6 @@ void ath9k_hw_setmcastfilter(struct ath_hw *ah, u32 filter0, u32 filter1)
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REG_WRITE(ah, AR_MCAST_FIL1, filter1);
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}
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void ath9k_hw_setbssidmask(struct ath_hw *ah)
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{
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struct ath_common *common = ath9k_hw_common(ah);
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REG_WRITE(ah, AR_BSSMSKL, get_unaligned_le32(common->bssidmask));
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REG_WRITE(ah, AR_BSSMSKU, get_unaligned_le16(common->bssidmask + 4));
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}
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void ath9k_hw_write_associd(struct ath_hw *ah)
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{
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struct ath_common *common = ath9k_hw_common(ah);
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@ -1570,6 +1570,7 @@ static int ath_init_softc(u16 devid, struct ath_softc *sc, u16 subsysid)
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common = ath9k_hw_common(ah);
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common->ops = &ath9k_common_ops;
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common->ah = ah;
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/*
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* Cache line size is used to size and align various
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@ -282,7 +282,7 @@ static void ath_opmode_init(struct ath_softc *sc)
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/* configure bssid mask */
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if (ah->caps.hw_caps & ATH9K_HW_CAP_BSSIDMASK)
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ath9k_hw_setbssidmask(ah);
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ath_hw_setbssidmask(common);
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/* configure operational mode */
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ath9k_hw_setopmode(ah);
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@ -17,6 +17,8 @@
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#ifndef REG_H
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#define REG_H
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#include "../reg.h"
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#define AR_CR 0x0008
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#define AR_CR_RXE 0x00000004
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#define AR_CR_RXD 0x00000020
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@ -1421,9 +1423,6 @@ enum {
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#define AR_SLEEP2_BEACON_TIMEOUT 0xFFE00000
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#define AR_SLEEP2_BEACON_TIMEOUT_S 21
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#define AR_BSSMSKL 0x80e0
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#define AR_BSSMSKU 0x80e4
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#define AR_TPC 0x80e8
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#define AR_TPC_ACK 0x0000003f
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#define AR_TPC_ACK_S 0x00
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@ -94,7 +94,7 @@ void ath9k_set_bssid_mask(struct ieee80211_hw *hw)
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common->bssidmask[4] = ~mask[4];
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common->bssidmask[5] = ~mask[5];
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ath9k_hw_setbssidmask(sc->sc_ah);
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ath_hw_setbssidmask(common);
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}
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int ath9k_wiphy_add(struct ath_softc *sc)
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126
drivers/net/wireless/ath/hw.c
Normal file
126
drivers/net/wireless/ath/hw.c
Normal file
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@ -0,0 +1,126 @@
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/*
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* Copyright (c) 2009 Atheros Communications Inc.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <asm/unaligned.h>
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#include "ath.h"
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#include "reg.h"
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#define REG_READ common->ops->read
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#define REG_WRITE common->ops->write
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/**
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* ath_hw_set_bssid_mask - filter out bssids we listen
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*
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* @common: the ath_common struct for the device.
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*
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* BSSID masking is a method used by AR5212 and newer hardware to inform PCU
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* which bits of the interface's MAC address should be looked at when trying
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* to decide which packets to ACK. In station mode and AP mode with a single
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* BSS every bit matters since we lock to only one BSS. In AP mode with
|
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* multiple BSSes (virtual interfaces) not every bit matters because hw must
|
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* accept frames for all BSSes and so we tweak some bits of our mac address
|
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* in order to have multiple BSSes.
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*
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* NOTE: This is a simple filter and does *not* filter out all
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* relevant frames. Some frames that are not for us might get ACKed from us
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* by PCU because they just match the mask.
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*
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* When handling multiple BSSes you can get the BSSID mask by computing the
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* set of ~ ( MAC XOR BSSID ) for all bssids we handle.
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*
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* When you do this you are essentially computing the common bits of all your
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* BSSes. Later it is assumed the harware will "and" (&) the BSSID mask with
|
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* the MAC address to obtain the relevant bits and compare the result with
|
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* (frame's BSSID & mask) to see if they match.
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*
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* Simple example: on your card you have have two BSSes you have created with
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* BSSID-01 and BSSID-02. Lets assume BSSID-01 will not use the MAC address.
|
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* There is another BSSID-03 but you are not part of it. For simplicity's sake,
|
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* assuming only 4 bits for a mac address and for BSSIDs you can then have:
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*
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* \
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* MAC: 0001 |
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* BSSID-01: 0100 | --> Belongs to us
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* BSSID-02: 1001 |
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* /
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* -------------------
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* BSSID-03: 0110 | --> External
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* -------------------
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*
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* Our bssid_mask would then be:
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*
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* On loop iteration for BSSID-01:
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* ~(0001 ^ 0100) -> ~(0101)
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* -> 1010
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* bssid_mask = 1010
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*
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* On loop iteration for BSSID-02:
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* bssid_mask &= ~(0001 ^ 1001)
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* bssid_mask = (1010) & ~(0001 ^ 1001)
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* bssid_mask = (1010) & ~(1001)
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* bssid_mask = (1010) & (0110)
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* bssid_mask = 0010
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*
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* A bssid_mask of 0010 means "only pay attention to the second least
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* significant bit". This is because its the only bit common
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* amongst the MAC and all BSSIDs we support. To findout what the real
|
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* common bit is we can simply "&" the bssid_mask now with any BSSID we have
|
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* or our MAC address (we assume the hardware uses the MAC address).
|
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*
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* Now, suppose there's an incoming frame for BSSID-03:
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*
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* IFRAME-01: 0110
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||||
*
|
||||
* An easy eye-inspeciton of this already should tell you that this frame
|
||||
* will not pass our check. This is beacuse the bssid_mask tells the
|
||||
* hardware to only look at the second least significant bit and the
|
||||
* common bit amongst the MAC and BSSIDs is 0, this frame has the 2nd LSB
|
||||
* as 1, which does not match 0.
|
||||
*
|
||||
* So with IFRAME-01 we *assume* the hardware will do:
|
||||
*
|
||||
* allow = (IFRAME-01 & bssid_mask) == (bssid_mask & MAC) ? 1 : 0;
|
||||
* --> allow = (0110 & 0010) == (0010 & 0001) ? 1 : 0;
|
||||
* --> allow = (0010) == 0000 ? 1 : 0;
|
||||
* --> allow = 0
|
||||
*
|
||||
* Lets now test a frame that should work:
|
||||
*
|
||||
* IFRAME-02: 0001 (we should allow)
|
||||
*
|
||||
* allow = (0001 & 1010) == 1010
|
||||
*
|
||||
* allow = (IFRAME-02 & bssid_mask) == (bssid_mask & MAC) ? 1 : 0;
|
||||
* --> allow = (0001 & 0010) == (0010 & 0001) ? 1 :0;
|
||||
* --> allow = (0010) == (0010)
|
||||
* --> allow = 1
|
||||
*
|
||||
* Other examples:
|
||||
*
|
||||
* IFRAME-03: 0100 --> allowed
|
||||
* IFRAME-04: 1001 --> allowed
|
||||
* IFRAME-05: 1101 --> allowed but its not for us!!!
|
||||
*
|
||||
*/
|
||||
void ath_hw_setbssidmask(struct ath_common *common)
|
||||
{
|
||||
void *ah = common->ah;
|
||||
|
||||
REG_WRITE(ah, get_unaligned_le32(common->bssidmask), AR_BSSMSKL);
|
||||
REG_WRITE(ah, get_unaligned_le16(common->bssidmask + 4), AR_BSSMSKU);
|
||||
}
|
||||
EXPORT_SYMBOL(ath_hw_setbssidmask);
|
27
drivers/net/wireless/ath/reg.h
Normal file
27
drivers/net/wireless/ath/reg.h
Normal file
|
@ -0,0 +1,27 @@
|
|||
/*
|
||||
* Copyright (c) 2008-2009 Atheros Communications Inc.
|
||||
*
|
||||
* Permission to use, copy, modify, and/or distribute this software for any
|
||||
* purpose with or without fee is hereby granted, provided that the above
|
||||
* copyright notice and this permission notice appear in all copies.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
||||
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
||||
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
||||
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
||||
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
||||
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
||||
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
||||
*/
|
||||
|
||||
#ifndef ATH_REGISTERS_H
|
||||
#define ATH_REGISTERS_H
|
||||
|
||||
/*
|
||||
* BSSID mask registers. See ath_hw_set_bssid_mask()
|
||||
* for detailed documentation about these registers.
|
||||
*/
|
||||
#define AR_BSSMSKL 0x80e0
|
||||
#define AR_BSSMSKU 0x80e4
|
||||
|
||||
#endif /* ATH_REGISTERS_H */
|
Loading…
Reference in a new issue