Author: adrian
Date: Fri Apr 29 01:53:45 2016
New Revision: 298762
URL: https://svnweb.freebsd.org/changeset/base/298762
Log:
[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
Modified:
head/sys/dev/ath/if_ath_tx_ht.c
Modified: head/sys/dev/ath/if_ath_tx_ht.c
==============================================================================
--- head/sys/dev/ath/if_ath_tx_ht.c Fri Apr 29 01:52:06 2016
(r298761)
+++ head/sys/dev/ath/if_ath_tx_ht.c Fri Apr 29 01:53:45 2016
(r298762)
@@ -227,6 +227,20 @@ ath_tx_rate_fill_rcflags(struct ath_soft
struct ath_rc_series *rc = bf->bf_state.bfs_rc;
uint8_t rate;
int i;
+ int do_ldpc;
+ int do_stbc;
+
+ /*
+ * We only do LDPC if the rate is 11n, both we and the
+ * receiver support LDPC and it's enabled.
+ *
+ * It's a global flag, not a per-try flag, so we clear
+ * it if any of the rate entries aren't 11n.
+ */
+ if ((ni->ni_vap->iv_htcaps & IEEE80211_HTCAP_LDPC) &&
+ (ni->ni_htcap & IEEE80211_HTCAP_LDPC))
+ do_ldpc = 1;
+ do_stbc = 0;
for (i = 0; i < ATH_RC_NUM; i++) {
rc[i].flags = 0;
@@ -250,6 +264,12 @@ ath_tx_rate_fill_rcflags(struct ath_soft
(HAL_TXDESC_RTSENA | HAL_TXDESC_CTSENA))
rc[i].flags |= ATH_RC_RTSCTS_FLAG;
+ /*
+ * If we can't do LDPC, don't.
+ */
+ if (! IS_HT_RATE(rate))
+ do_ldpc = 0;
+
/* Only enable shortgi, 2040, dual-stream if HT is set */
if (IS_HT_RATE(rate)) {
rc[i].flags |= ATH_RC_HT_FLAG;
@@ -281,6 +301,7 @@ ath_tx_rate_fill_rcflags(struct ath_soft
(sc->sc_cur_txchainmask > 1) &&
HT_RC_2_STREAMS(rate) == 1) {
rc[i].flags |= ATH_RC_STBC_FLAG;
+ do_stbc = 1;
}
/*
@@ -324,6 +345,18 @@ ath_tx_rate_fill_rcflags(struct ath_soft
"%s: i=%d, rate=0x%x, flags=0x%x, max4ms=%d\n",
__func__, i, rate, rc[i].flags, rc[i].max4msframelen);
}
+
+ /*
+ * LDPC is a global flag, so ...
+ */
+ if (do_ldpc) {
+ bf->bf_state.bfs_txflags |= HAL_TXDESC_LDPC;
+ sc->sc_stats.ast_tx_ldpc++;
+ }
+
+ if (do_stbc) {
+ sc->sc_stats.ast_tx_stbc++;
+ }
}
/*
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