FreeNAS

It would be great and extremely interesting in datacenter environments to have control about the VLAN priority code point to classify storage traffic on a given VLAN interface.

FreeBSD 11.0-STABLE [[https://svnweb.freebsd.org/base?view=revision&revision=301496]] already supports this, and it's just a question of enabling a field on the web interface to set the 3 byte value of the CoS field on the 802.1q frame.

I've done simple tests on FreeNAS 11.0-RC and I was able to set the vlanpcp over the CLI:

[root@freenas ~]# ifconfig vlan1                                                
vlan1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500     
        options=3<RXCSUM,TXCSUM>                                                
        ether 00:0c:29:06:33:14                                                 
        nd6 options=9<PERFORMNUD,IFDISABLED>                                    
        media: Ethernet autoselect (1000baseT <full-duplex>)                    
        status: active                                                          
        vlan: 10 vlanpcp: 0 parent interface: em0                               
        groups: vlan                                                            

[root@freenas ~]# ifconfig vlan1 vlanpcp 4

[root@freenas ~]# ifconfig vlan1                                                
vlan1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500     
        options=3<RXCSUM,TXCSUM>                                                
        ether 00:0c:29:06:33:14                                                 
        nd6 options=9<PERFORMNUD,IFDISABLED>                                    
        media: Ethernet autoselect (1000baseT <full-duplex>)                    
        status: active                                                          
        vlan: 10 vlanpcp: 4 parent interface: em0                               
        groups: vlan                                                            
[root@freenas ~]

Enabling this would be breakthrough for implement Lossless iSCSI traffic on DCB Enabled switches that relies on CoS Classification to match the iSCSI traffic.