kern/168246: Multiple em(4) not working with qemu

[Arnaud Lacombe]

>Number:         168246
>Category:       kern
>Synopsis:       Multiple em(4) not working with qemu
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed May 23 02:20:01 UTC 2012
>Closed-Date:
>Last-Modified:
>Originator:     Arnaud Lacombe
>Release:        9.0-RELEASE
>Organization:
n/a
>Environment:
>Description:
It would seem that FreeBSD is unable to deal correctly with qemu's
networking when *more* than one e1000 interface is exported. TX works, but RX seems broken. re(4) in the exact same configuration works fine.

>How-To-Repeat:
# qemu -nographic -hda /vm/hdd-freebsd-i386 \
   -net nic -net tap,script=/vm/ifup \
   -net nic -net tap,script=/vm/ifup \
   -net nic -net tap,script=/vm/ifup \
   -net nic -net tap,script=/vm/ifup \
   -net nic -net tap,script=/vm/ifup \
   -net nic -net tap,script=/vm/ifup
Copyright (c) 1992-2012 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
       The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 9.0-RELEASE #0: Tue Jan  3 07:15:25 UTC 2012
   root at obrian.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC i386
CPU: QEMU Virtual CPU version 0.14.50 (2660.53-MHz 686-class CPU)
 Origin = "GenuineIntel"  Id = 0x633  Family = 6  Model = 3  Stepping = 3
 Features=0x781abf9<FPU,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,PGE,CMOV,PAT,MMX,FXSR,SSE,SSE2>
 Features2=0x80800001<SSE3,POPCNT,HV>
real memory  = 134205440 (127 MB)
avail memory = 112107520 (106 MB)
[...]
em0: <Intel(R) PRO/1000 Legacy Network Connection 1.0.3> port
0xc040-0xc07f mem 0xf2020000-0xf203ffff irq 11 at device 3.0 on pci0
em0: Memory Access and/or Bus Master bits were not set!
em0: Ethernet address: 52:54:00:12:34:56
[...]
em5: <Intel(R) PRO/1000 Legacy Network Connection 1.0.3> port
0xc180-0xc1bf mem 0xf2160000-0xf217ffff irq 11 at device 8.0 on pci0
em5: Memory Access and/or Bus Master bits were not set!
em5: Ethernet address: 52:54:00:12:34:5b
[...]
# ifconfig em0 10.0.255.2
# ping 10.0.255.1
PING 10.0.255.1 (10.0.255.1): 56 data bytes
ping: sendto: Host is down
ping: sendto: Host is down
ping: sendto: Host is down
>Fix:
please.

>Release-Note:
>Audit-Trail:
>Unformatted: