Date: Tue, 12 Nov 2013 04:57:32 +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: r258031 - head/sys/dev/iwn Message-ID: <201311120457.rAC4vW1X076348@svn.freebsd.org>
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Author: adrian Date: Tue Nov 12 04:57:31 2013 New Revision: 258031 URL: http://svnweb.freebsd.org/changeset/base/258031 Log: Comment what 'mimo' does in the link quality table. Modified: head/sys/dev/iwn/if_iwn.c Modified: head/sys/dev/iwn/if_iwn.c ============================================================================== --- head/sys/dev/iwn/if_iwn.c Tue Nov 12 04:56:00 2013 (r258030) +++ head/sys/dev/iwn/if_iwn.c Tue Nov 12 04:57:31 2013 (r258031) @@ -4368,7 +4368,17 @@ iwn_set_link_quality(struct iwn_softc *s plcp = iwn_rate_to_plcp(sc, ni, rate); linkq.retry[i] = plcp; - /* Special case for dual-stream rates? */ + /* + * The mimo field is an index into the table which + * indicates the first index where it and subsequent entries + * will not be using MIMO. + * + * Since we're filling linkq from 0..15 and we're filling + * from the higest MCS rates to the lowest rates, if we + * _are_ doing a dual-stream rate, set mimo to idx+1 (ie, + * the next entry.) That way if the next entry is a non-MIMO + * entry, we're already pointing at it. + */ if ((le32toh(plcp) & IWN_RFLAG_MCS) && RV(le32toh(plcp)) > 7) linkq.mimo = i + 1;
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