kern/170712: [cxgb][vlan] Need to up parent cxgb interfaces in order for vlan interfaces to become active when interface set statically if netif not run at boot

[Garrett Cooper]

>Number:         170712
>Category:       kern
>Synopsis:       [cxgb][vlan] Need to up parent cxgb interfaces in order for vlan interfaces to become active when interface set statically if netif not run at boot
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Aug 17 20:30:07 UTC 2012
>Closed-Date:
>Last-Modified:
>Originator:     Garrett Cooper
>Release:        7.3-RELEASE/7.4-RELEASE/9.0-RELEASE
>Organization:
EMC Isilon
>Environment:
FreeBSD  7.4-RELEASE-p10 FreeBSD 7.4-RELEASE-p10 #0: Fri Aug 17 07:15:01 UTC 2012     root@:/usr/obj/mnt/freebsd/releng/7.4/sys/ISI-GENERIC  amd64

FreeBSD wf048.west.isilon.com 9.0-RELEASE FreeBSD 9.0-RELEASE #0: Tue Jan  3 07:46:30 UTC 2012     root at farrell.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  amd64
>Description:
I've been running vlan interoperability tests and I noticed that in order for the interfaces to be up and functional I need to manually ifconfig up the interfaces (otherwise the interface status remains "no carrier").

Not really a big deal for me, but definitely an annoyance and probably an issue for other end-users of FreeBSD dealing with vlans with cxgb (there are other issues with the cxgb(4) driver that prevent it from being usable built into the kernel in 7.x and there are other things I suppose I could do to force things to function more rationally on 9.x).

Other details:

# cat /etc/rc.conf 
hostname="bf049.west.isilon.com"
vlans_cxgb0="190"
vlans_cxgb1="190"
ifconfig_cxgb0_190="inet 192.168.20.2/24"
ifconfig_cxgb1_190="inet 192.168.21.2/16"
ifconfig_em0="DHCP"
sshd_enable="YES"
# awk '! /^#/ && NF > 0' /etc/sysctl.conf
kern.ipc.nmbjumbo9=262144
kern.ipc.nmbjumbo16=262144
kern.ipc.nmbclusters=262144
kern.ipc.nmbjumbop=262144
kern.ipc.maxsockbuf=2097152
net.inet.tcp.recvspace=65536
net.inet.tcp.recvbuf_max=2097152
net.inet.tcp.recvbuf_max=2097152
net.inet.tcp.recvbuf_inc=16384
net.inet.tcp.recvspace_max=2097152
net.inet.tcp.recvspace_inc=16384
net.inet.tcp.sendspace=32768
net.inet.tcp.sendbuf_max=2097152
net.inet.tcp.sendbuf_inc=8192
net.inet.tcp.sendspace_max=2097152
net.inet.tcp.sendspace_inc=16384
# cat /boot/loader.conf 
#if_cxgb_load="YES"
#if_em_load="YES"

kern.ipc.nmbclusters="250000"

wf048# cat /etc/rc.conf 
hostname="wf048.west.isilon.com"
vlans_cxgb1="190"
ifconfig_cxgb1_190="inet 192.168.20.1/24"
ifconfig_em0="DHCP"
sshd_enable="YES"
ntpd_enable="YES"
# Set dumpdev to "AUTO" to enable crash dumps, "NO" to disable
dumpdev="NO"
wf048# awk '! /^#/ && NF > 0' /etc/sysctl.conf
kern.ipc.nmbjumbo9=262144
kern.ipc.nmbjumbo16=262144
kern.ipc.nmbclusters=262144
kern.ipc.nmbjumbop=262144
kern.ipc.maxsockbuf=2097152
net.inet.tcp.recvspace=65536
net.inet.tcp.recvbuf_max=2097152
net.inet.tcp.recvbuf_max=2097152
net.inet.tcp.recvbuf_inc=16384
net.inet.tcp.recvspace_max=2097152
net.inet.tcp.recvspace_inc=16384
net.inet.tcp.sendspace=32768
net.inet.tcp.sendbuf_max=2097152
net.inet.tcp.sendbuf_inc=8192
net.inet.tcp.sendspace_max=2097152
net.inet.tcp.sendspace_inc=16384
wf048# cat /boot/loader.conf 
kern.ipc.nmbclusters="250000"
if_cxgb_load="YES"
if_em_load="YES"

I would mark this PR as a low priority item/enhancement.
>How-To-Repeat:
1. Add above config to /etc/rc.conf .
2. Force loading cxgb(4) after boot like so: ifconfig cxgb0.
3. Wait for the NIC chips to settle after a few seconds and check interface state via ifconfig cxgb0.
>Fix:
An event handler / mechanism needs to be added between the interface and vlan layer in order for things to function, or a mechanism needs to be added to devd to force /etc/rc.d/netif restart cxgb0 to be kicked.

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