[ath] Add LDPC transmit support.
LDPC adds better transmit reliability if both ends support it. You in theory can do both STBC and LDPC at the same time. If I see issues I'll disable it. * Only enable it if both ends of a connection negotiate it. * Disable it if any rate is non-11n. * Count both LDPC TX and STBC TX. Tested: * AR9380, STA mode
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=298762
@ -227,6 +227,20 @@ ath_tx_rate_fill_rcflags(struct ath_softc *sc, struct ath_buf *bf)
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struct ath_rc_series *rc = bf->bf_state.bfs_rc;
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uint8_t rate;
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int i;
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int do_ldpc;
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int do_stbc;
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/*
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* We only do LDPC if the rate is 11n, both we and the
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* receiver support LDPC and it's enabled.
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*
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* It's a global flag, not a per-try flag, so we clear
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* it if any of the rate entries aren't 11n.
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*/
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if ((ni->ni_vap->iv_htcaps & IEEE80211_HTCAP_LDPC) &&
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(ni->ni_htcap & IEEE80211_HTCAP_LDPC))
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do_ldpc = 1;
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do_stbc = 0;
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for (i = 0; i < ATH_RC_NUM; i++) {
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rc[i].flags = 0;
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@ -250,6 +264,12 @@ ath_tx_rate_fill_rcflags(struct ath_softc *sc, struct ath_buf *bf)
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(HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA))
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rc[i].flags |= ATH_RC_RTSCTS_FLAG;
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/*
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* If we can't do LDPC, don't.
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*/
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if (! IS_HT_RATE(rate))
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do_ldpc = 0;
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/* Only enable shortgi, 2040, dual-stream if HT is set */
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if (IS_HT_RATE(rate)) {
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rc[i].flags |= ATH_RC_HT_FLAG;
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@ -281,6 +301,7 @@ ath_tx_rate_fill_rcflags(struct ath_softc *sc, struct ath_buf *bf)
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(sc->sc_cur_txchainmask > 1) &&
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HT_RC_2_STREAMS(rate) == 1) {
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rc[i].flags |= ATH_RC_STBC_FLAG;
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do_stbc = 1;
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}
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/*
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@ -324,6 +345,18 @@ ath_tx_rate_fill_rcflags(struct ath_softc *sc, struct ath_buf *bf)
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"%s: i=%d, rate=0x%x, flags=0x%x, max4ms=%d\n",
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__func__, i, rate, rc[i].flags, rc[i].max4msframelen);
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}
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/*
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* LDPC is a global flag, so ...
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*/
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if (do_ldpc) {
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bf->bf_state.bfs_txflags |= HAL_TXDESC_LDPC;
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sc->sc_stats.ast_tx_ldpc++;
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}
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if (do_stbc) {
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sc->sc_stats.ast_tx_stbc++;
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}
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}
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/*
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