Re: [PATCH net-next v7 12/12] net: dsa: add driver for MaxLinear GSW1xx switch family

["Sverdlin, Alexander" <alexander.sverdlin@siemens.com>]

Hi Vladimir,

On Thu, 2025-11-06 at 17:27 +0200, Vladimir Oltean wrote:
> > The remaining failing test cases are:
> > TEST: VLAN over vlan_filtering=1 bridged port: Unicast IPv4 to unknown MAC address   [FAIL]
> >          reception succeeded, but should have failed
> > TEST: VLAN over vlan_filtering=1 bridged port: Unicast IPv4 to unknown MAC address, allmulti   [FAIL]
> >          reception succeeded, but should have failed
> > 
> > So far I didn't notice any problems with untagged read-word IP traffic over
> > GSW145 ports.
> > 
> > Do you have a suggestion what could I check further regarding the failing
> > test cases? As I understood, all of them pass on your side?
> 
> These failures mean that the test thinks the port implements IFF_UNICAST_FLT,
> yet it doesn't drop unregistered traffic.
> 
> 	[ $no_unicast_flt = true ] && should_receive=true || should_receive=false
> 	check_rcv $rcv_if_name "Unicast IPv4 to unknown MAC address" \
> 		"$smac > $UNKNOWN_UC_ADDR1, ethertype IPv4 (0x0800)" \
> 		$should_receive "$test_name"
> 
> But DSA doesn't report IFF_UNICAST_FLT for this switch, because it doesn't fulfill
> the dsa_switch_supports_uc_filtering() requirements. So should_receive should have
> been true, and the question becomes why does this code snippet set no_unicast_flt=false:
> 
> vlan_over_bridged_port()
> {
> 	local no_unicast_flt=true
> 	local vlan_filtering=$1
> 	local skip_ptp=false
> 
> 	# br_manage_promisc() will not force a single vlan_filtering port to
> 	# promiscuous mode, so we should still expect unicast filtering to take
> 	# place if the device can do it.
> 	if [ $(has_unicast_flt $h2) = yes ] && [ $vlan_filtering = 1 ]; then
> 		no_unicast_flt=false
> 	fi
> 
> Because IFF_UNICAST_FLT is not a UAPI-visible property, has_unicast_flt() does
> an indirect check: it creates a macvlan upper with a different MAC address than
> the physical interface's, and this results in a dev_uc_add() in the kernel.
> If the unicast address is non-empty but the device doesn't have IFF_UNICAST_FLT,
> __dev_set_rx_mode() makes the interface promiscuous, which has_unicast_flt()
> then tests.

here is the corresponding kernel log preceding the failing test cases, maybe it
might help?

[  539.836062] mxl-gsw1xx 8000f00.mdio:00 lan1: left allmulticast mode
[  539.845053] am65-cpsw-nuss 8000000.ethernet eth0: left allmulticast mode
[  539.853401] br0: port 1(lan1) entered disabled state
[  545.641001] am65-cpsw-nuss 8000000.ethernet: Removing vlan 1 from vlan filter
[  546.075411] mxl-gsw1xx 8000f00.mdio:00 lan1: Link is Down
[  546.666944] mxl-gsw1xx 8000f00.mdio:00 lan0: Link is Down
[  547.779308] mxl-gsw1xx 8000f00.mdio:00 lan1: configuring for phy/internal link mode
[  548.803903] mxl-gsw1xx 8000f00.mdio:00 lan0: configuring for phy/internal link mode
[  549.561829] mxl-gsw1xx 8000f00.mdio:00 lan1: configuring for phy/internal link mode
[  550.366300] mxl-gsw1xx 8000f00.mdio:00 lan1: configuring for phy/internal link mode
[  550.395032] br0: port 1(lan1) entered blocking state
[  550.401063] br0: port 1(lan1) entered disabled state
[  550.406470] mxl-gsw1xx 8000f00.mdio:00 lan1: entered allmulticast mode
[  550.413868] am65-cpsw-nuss 8000000.ethernet eth0: entered allmulticast mode
[  550.440111] am65-cpsw-nuss 8000000.ethernet: Adding vlan 1 to vlan filter
[  550.465479] am65-cpsw-nuss 8000000.ethernet: Adding vlan 100 to vlan filter
[  552.519232] mxl-gsw1xx 8000f00.mdio:00 lan1: Link is Up - 100Mbps/Full - flow control rx/tx
[  552.530513] br0: port 1(lan1) entered blocking state
[  552.536463] br0: port 1(lan1) entered forwarding state
[  552.999330] mxl-gsw1xx 8000f00.mdio:00 lan0: Link is Up - 100Mbps/Full - flow control rx/tx
[  581.899262] lan1.100: entered promiscuous mode
[  592.995574] lan1.100: left promiscuous mode
[  596.665022] lan1.100: entered allmulticast mode
[  607.789778] lan1.100: left allmulticast mode
--
TEST: VLAN over vlan_filtering=1 bridged port: Unicast IPv4 to macvlan MAC address   [ OK ]
TEST: VLAN over vlan_filtering=1 bridged port: Unicast IPv4 to unknown MAC address   [FAIL]
        reception succeeded, but should have failed
TEST: VLAN over vlan_filtering=1 bridged port: Unicast IPv4 to unknown MAC address, promisc   [ OK ]
TEST: VLAN over vlan_filtering=1 bridged port: Unicast IPv4 to unknown MAC address, allmulti   [FAIL]
        reception succeeded, but should have failed

-- 
Alexander Sverdlin
Siemens AG
www.siemens.com