kern/161035: [ieee80211]Incorrect number describing 11ng MCS rate in ifconfig -v?

Maciej Milewski milu at
Mon Sep 26 15:20:10 UTC 2011

>Number:         161035
>Category:       kern
>Synopsis:       [ieee80211]Incorrect number describing 11ng MCS rate in ifconfig -v?
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Sep 26 15:20:09 UTC 2011
>Originator:     Maciej Milewski
>Release:        9.0-BETA2
FreeBSD RSPRO 9.0-BETA2 FreeBSD 9.0-BETA2 #1 r225678+a5ec0bf-dirty: Sun Sep 25 18:21:41 CEST 2011     root at snifi.laptop:/data/obj/mipseb/mips.mipseb/data/head-git/sys/RSPRO_STANDALONE  mips
Running ifconfig -v wlan1 makes:
        sturbo  ucast NONE    mgmt  6 Mb/s mcast  6 Mb/s maxretry 6
        11na    ucast NONE    mgmt 12 MCS  mcast 12 MCS  maxretry 6
        11ng    ucast NONE    mgmt  2 MCS  mcast  2 MCS  maxretry 6

I think that it's incorrect. 12MCS needs 2 spatial stream and what is with cards which support only one?

Something in this subject is mentioned in line 1608 sys/net80211/ieee80211.c
   1608 >.......>......./* NB: 12 is ambiguous, it will be treated as an MCS */




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