kern/46101: wpi(4) does not support IBSS (ad-hoc) mode

[Pierre Pronchery <khorben%defora.org@localhost>]

>Number:         46101
>Category:       kern
>Synopsis:       wpi(4) erroneously mentions IBSS (ad-hoc) as supported
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Feb 26 16:50:04 +0000 2012
>Originator:     Pierre Pronchery
>Release:        NetBSD 5.99.64
>Organization:
>Environment:
System: NetBSD kwarx.defora.lan 5.99.64 NetBSD 5.99.64 (SPLASH) #0: Sat Feb 11 
15:24:34 CET 2012 
khorben%kwarx.defora.lan@localhost:/home/amd64/obj/sys/arch/amd64/compile/SPLASH
 amd64
Architecture: x86_64
Machine: amd64
>Description:
After a number of tests, checking documentation and comparing code with
the OpenBSD version of this driver, I realized that IBSS mode is not
meant to be supported at all in the current version of either driver.

However, the driver advertises otherwise:

=== BEGIN PASTE ===
# ifconfig -m wpi0
[...]
                media DS11 mediaopt adhoc
=== END PASTE ===

Enabling ad-hoc mode will then always end up in a "fatal firmware
error", with my current setup at least.

>How-To-Repeat:
# ifconfig wpi0 media DS11 mediaopt adhoc nwid TestSSID up
# ifconfig wpi0 | grep flags
wpi0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500

>Fix:
Well, the best would be to properly implement IBSS support... However,
in the meantime, I believe the following patch should be applied:

Index: sys/dev/pci/if_wpi.c
===================================================================
RCS file: /cvsroot/src/sys/dev/pci/if_wpi.c,v
retrieving revision 1.50
diff -p -u -r1.50 if_wpi.c
--- sys/dev/pci/if_wpi.c        30 Jan 2012 19:41:21 -0000      1.50
+++ sys/dev/pci/if_wpi.c        26 Feb 2012 16:25:09 -0000
@@ -310,7 +310,9 @@ wpi_attach(device_t parent __unused, dev
 
        /* set device capabilities */
        ic->ic_caps =
+#ifdef notyet
                IEEE80211_C_IBSS |       /* IBSS mode support */
+#endif
                IEEE80211_C_WPA |        /* 802.11i */
                IEEE80211_C_MONITOR |    /* monitor mode supported */
                IEEE80211_C_TXPMGT |     /* tx power management */

>Unformatted:
 $NetBSD: if_wpi.c,v 1.50 2012/01/30 19:41:21 drochner Exp $