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Add in the (very!) optional glue to flip the 11n bits for if_ath.

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There's still a lot of random issues to sort out with the radio side of
things and AMPDU RX handling (and completely missing AMPDU TX handling!)
but if people wish to give this a go and assist in debugging the
issues, they can define ATH_DO_11N to enable it.

I'm just re-iterating - this is here to allow people to assist in
further 11n development; it is not any indication that the 11n support
is complete and functional.

Important notes:

* This doesn't support 1-stream cards yet - (eg AR9285) - the various bits
  that negotiate TX/RX MCS don't know not to try >1 stream TX or negotiate
  1-stream RX; so don't enable 11n unless you've first taught the rate
  control module and the net80211 stack to negotiate 1-stream stuff;

* The only rate control module minimally 11n aware is ath_rate_sample;

* ath_rate_sample doesn't know about HT/40; so airtime will be incorrectly
  calculated;

* The AR9160 and AR9280 radio code is unreliable at the higher MCS rates for
  some reason; this will definitely impact 11n performance;

* AMPDU-TX isn't yet implemented;

* AMPDU-RX may be a bit buggy still and will definitely suffer from the
  radio unreliability mentioned above (ie, don't expect 150/300mbit
  RX just yet.)
This commit is contained in:
Adrian Chadd 2011-02-09 15:43:38 +00:00
parent 3eb6e1317c
commit 67397d396f
1 changed files with 50 additions and 0 deletions
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50
sys/dev/ath/if_ath.c
View file

@ -283,6 +283,10 @@ SYSCTL_INT(_hw_ath, OID_AUTO, bstuck, CTLFLAG_RW, &ath_bstuck_threshold,
MALLOC_DEFINE(M_ATHDEV, "athdev", "ath driver dma buffers");
#define HAL_MODE_HT20 (HAL_MODE_11NG_HT20 | HAL_MODE_11NA_HT20)
#define HAL_MODE_HT40 \
(HAL_MODE_11NG_HT40PLUS | HAL_MODE_11NG_HT40MINUS | \
HAL_MODE_11NA_HT40PLUS | HAL_MODE_11NA_HT40MINUS)
int
ath_attach(u_int16_t devid, struct ath_softc *sc)
{
@ -611,6 +615,52 @@ ath_attach(u_int16_t devid, struct ath_softc *sc)
ic->ic_tdma_update = ath_tdma_update;
}
#endif
/*
* The if_ath 11n support is completely not ready for normal use.
* Enabling this option will likely break everything and everything.
* Don't think of doing that unless you know what you're doing.
*/
#ifdef DO_ATH_11N
/*
* Query HT capabilities
*/
if (ath_hal_getcapability(ah, HAL_CAP_HT, 0, NULL) == HAL_OK &&
(wmodes & (HAL_MODE_HT20 | HAL_MODE_HT40))) {
int rxs, txs;
device_printf(sc->sc_dev, "[HT] enabling HT modes\n");
ic->ic_htcaps = IEEE80211_HTC_HT /* HT operation */
| IEEE80211_HTC_AMPDU /* A-MPDU tx/rx */
| IEEE80211_HTC_AMSDU /* A-MSDU tx/rx */
| IEEE80211_HTCAP_MAXAMSDU_3839 /* max A-MSDU length */
| IEEE80211_HTCAP_SHORTGI20 /* short GI in 20MHz */
| IEEE80211_HTCAP_SMPS_OFF; /* SM power save off */
;
if (wmodes & HAL_MODE_HT40)
ic->ic_htcaps |= IEEE80211_HTCAP_CHWIDTH40
| IEEE80211_HTCAP_SHORTGI40;
/*
* rx/tx stream is not currently used anywhere; it needs to be taken
* into account when negotiating which MCS rates it'll receive and
* what MCS rates are available for TX.
*/
(void) ath_hal_getcapability(ah, HAL_CAP_STREAMS, 0, &rxs);
(void) ath_hal_getcapability(ah, HAL_CAP_STREAMS, 1, &txs);
ath_hal_getrxchainmask(ah, &sc->sc_rxchainmask);
ath_hal_gettxchainmask(ah, &sc->sc_txchainmask);
ic->ic_txstream = txs;
ic->ic_rxstream = rxs;
device_printf(sc->sc_dev, "[HT] %d RX streams; %d TX streams\n", rxs, txs);
}
#endif
/*
* Indicate we need the 802.11 header padded to a
* 32-bit boundary for 4-address and QoS frames.