Add in HT protection but disable it by default.

I'll clear how it's supposed to work with Bernhard and then look
at enabling this in the correct situations.

But this -does- enable HT RTS protection (using the appropriate legacy
rates) if this bit of code is enabled.

1 files changed, 18 insertions, 0 deletions

diff --git a/sys/dev/ath/if_ath_tx.c b/sys/dev/ath/if_ath_tx.c
index d889858..f4cee6d 100644
--- a/sys/dev/ath/if_ath_tx.c
+++ b/sys/dev/ath/if_ath_tx.c
@@ -702,6 +702,24 @@ ath_tx_start(struct ath_softc *sc, struct ieee80211_node *ni, struct ath_buf *bf
 		sc->sc_stats.ast_tx_protect++;
 	}
 
+#if 0
+	/*
+	 * If 11n protection is enabled and it's a HT frame,
+	 * enable RTS.
+	 *
+	 * XXX ic_htprotmode or ic_curhtprotmode?
+	 * XXX should it_htprotmode only matter if ic_curhtprotmode 
+	 * XXX indicates it's not a HT pure environment?
+	 */
+	if ((ic->ic_htprotmode == IEEE80211_PROT_RTSCTS) &&
+	    rt->info[rix].phy == IEEE80211_T_HT &&
+	    (flags & HAL_TXDESC_NOACK) == 0) {
+		cix = rt->info[sc->sc_protrix].controlRate;
+	    	flags |= HAL_TXDESC_RTSENA;
+		sc->sc_stats.ast_tx_htprotect++;
+	}
+#endif
+
 	/*
 	 * Calculate duration.  This logically belongs in the 802.11
 	 * layer but it lacks sufficient information to calculate it.