Can the PCP field be set in the netdev table?

[Kevin Vigouroux <ke.vigouroux@laposte.net>]

Hi!

I tried in vain to modify the PCP field with many rules. Nothing worked.

#+begin_src
table netdev t {
	chain in_update_vlan {
		vlan type arp counter
		ip saddr 192.168.60.5 icmp type echo-request counter
	}

	chain in {
		type filter hook ingress device "end0" priority filter; policy accept;
		ether saddr 96:3f:66:77:df:88 vlan id 5 jump in_update_vlan
	}

	chain out_update_vlan {
		vlan type arp meta priority set 0:6 counter
		ip daddr 192.168.60.5 icmp type echo-reply meta priority set 0:6 counter
	}

	chain out {
		type filter hook egress device "end0" priority filter; policy accept;
		ether daddr 96:3f:66:77:df:88 vlan id 5 jump out_update_vlan
	}
}
#+end_src

#+begin_src
table netdev t {
	chain out {
		type filter hook egress device "end0" priority filter; policy accept;
		ether saddr 1f:9b:96:c7:14:d3 vlan pcp 0 vlan pcp set 2 counter
	}
}
#+end_src

#+begin_src
table netdev t {
	chain out {
		type filter hook egress device "end0" priority filter; policy accept;
		ip daddr 192.168.60.5 icmp type echo-reply meta priority set 0:6 meta nftrace set 1
	}
}
#+end_src

#+begin_src
$ sudo nft --debug=netlink add rule netdev t out vlan pcp set 1 counter
netdev filter t
  [ meta load iiftype => reg 1 ]
  [ cmp eq reg 1 0x00000001 ]
  [ payload load 2b @ link header + 12 => reg 1 ]
  [ cmp eq reg 1 0x00000081 ]
  [ payload load 1b @ link header + 14 => reg 1 ]
  [ bitwise reg 1 = ( reg 1 & 0x0000001f ) ^ 0x00000020 ]
  [ payload write reg 1 => 1b @ link header + 14 csum_type 0 csum_off 0 csum_flags 0x0 ]
  [ counter pkts 0 bytes 0 ]

$ sudo nft --debug=netlink add rule netdev t out vlan pcp set 6 counter
netdev filter t
  [ meta load iiftype => reg 1 ]
  [ cmp eq reg 1 0x00000001 ]
  [ payload load 2b @ link header + 12 => reg 1 ]
  [ cmp eq reg 1 0x00000081 ]
  [ payload load 1b @ link header + 14 => reg 1 ]
  [ bitwise reg 1 = ( reg 1 & 0x0000001f ) ^ 0x000000c0 ]
  [ payload write reg 1 => 1b @ link header + 14 csum_type 0 csum_off 0 csum_flags 0x0 ]
  [ counter pkts 0 bytes 0 ]
#+end_src

I don't have enough knowledge to understand this issue. My device is a 802.1Q
VLAN whose master device is an Ethernet NIC (this is not a switch or software
bridge). Is it a “driver” issue?

Any help?

--
Best regards,
Kevin Vigouroux