Date: Sat, 9 Nov 2013 07:30:14 +0000 (UTC) From: Adrian Chadd <adrian@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r257881 - head/sys/net80211 Message-ID: <201311090730.rA97UEcn063025@svn.freebsd.org>
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Author: adrian Date: Sat Nov 9 07:30:13 2013 New Revision: 257881 URL: http://svnweb.freebsd.org/changeset/base/257881 Log: Fix AMRR to correctly select the initial rate. There were two bugs: * If the initial lowest rate didn't go through the loop at least once, the AMRR rate index would be the highest rate in the table (eg the rix mapping to MCS15) but rate would stay at the default value, namely 0. This meant that the initial rate selection would be MCS15 _but_ the node ni_txrate value would be MCS0. * If the node is 11n, then break out of the loop correctly. Beforehand, my initial 11n AMRR commit would immediately exit out as it would fail the 11n check, then it would always fall through to the non-11n rate which would then see if it was < 36mbit (ie, "72"), which would always match. Hence, it'd always return MCS15. Tested: * Intel Centrino 2230 STA (local changes), STA mode * Intel Wifi 5100, STA Modified: head/sys/net80211/ieee80211_amrr.c Modified: head/sys/net80211/ieee80211_amrr.c ============================================================================== --- head/sys/net80211/ieee80211_amrr.c Sat Nov 9 06:30:09 2013 (r257880) +++ head/sys/net80211/ieee80211_amrr.c Sat Nov 9 07:30:13 2013 (r257881) @@ -199,13 +199,13 @@ amrr_node_init(struct ieee80211_node *ni amn->amn_rix--) { /* legacy - anything < 36mbit, stop searching */ /* 11n - stop at MCS4 / MCS12 / MCS28 */ - if (amrr_node_is_11n(ni) && - (rs->rs_rates[amn->amn_rix] & 0x7) < 4) + if (amrr_node_is_11n(ni)) { + if ((rs->rs_rates[amn->amn_rix] & 0x7) < 4) + break; + } else if ((rs->rs_rates[amn->amn_rix] & IEEE80211_RATE_VAL) <= 72) break; - else if ((rs->rs_rates[amn->amn_rix] & IEEE80211_RATE_VAL) <= 72) - break; - rate = rs->rs_rates[amn->amn_rix] & IEEE80211_RATE_VAL; } + rate = rs->rs_rates[amn->amn_rix] & IEEE80211_RATE_VAL; /* if the rate is an 11n rate, ensure the MCS bit is set */ if (amrr_node_is_11n(ni))
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