MX4300 NSS Setup SQM on WAN with PPPoE and VLAN tag

I'm not sure if this is the right place to post this, since the NSS build is not standard openwrt, but I thought I'd start here instead of cluttering up the Qualcommax NSS build topic. Also, I do not think I'm experiencing bugs in that firmware, I'm just unsure if I understand how to properly configure my setup in a way that will make sure that it's taking advantage of the offloading.

I've got 1Gb symmetric fiber and my provider requires a VLAN tag and PPPoE on the WAN. I am able to connect to the internet using the router via WIFI, so this configuration definitely works.

I made a build off of qosmios 24.10-nss branch with a few tweaks:

./scripts/feeds update -a \
    && ./scripts/feeds install -a \
    && cp nss-setup/config-nss.seed .config \
    && sed -i 's/# CONFIG_TARGET_qualcommax_ipq807x_DEVICE_linksys_mx4300 is not set/CONFIG_TARGET_qualcommax_ipq807x_DEVICE_linksys_mx4300=y/' .config \
    && sed -i 's/CONFIG_PACKAGE_wpad-mesh-openssl=y/CONFIG_PACKAGE_wpad-openssl=y/' .config \
    && sed -i 's/# CONFIG_PACKAGE_acme-acmesh-dnsapi is not set/CONFIG_PACKAGE_acme-acmesh-dnsapi=y/' .config \
    && echo 'CONFIG_DEFAULT_wpad-openssl=y' >> .config \
    && echo 'CONFIG_DEFAULT_dnsmasq-full=y' >> .config \
    && echo 'CONFIG_PACKAGE_luci-app-ddns=y' >> .config \
    && make defconfig V=s \
    && make download -j1 V=s \
    && make -j$(nproc) V=s

After flashing the firmware and setting everything up I am able to connect to wifi and access the internet, so that's awesome. However, I do see some SQM errors in the system log on reboot:

Wed Jun  4 20:02:13 2025 user.notice SQM: ERROR: cmd_wrapper: tc: FAILURE (1): /sbin/tc qdisc show dev ifb@wan
Wed Jun  4 20:02:13 2025 user.notice SQM: ERROR: cmd_wrapper: tc: LAST ERROR: Cannot find device "ifb@wan"
Wed Jun  4 20:02:13 2025 user.notice SQM: Starting SQM script: nss-zk.qos on pppoe-wan, in: 750000 Kbps, out: 750000 Kbps
Wed Jun  4 20:02:13 2025 user.notice SQM: sqm_prepare_script: loading required kernel module: qca_nss_qdisc
Wed Jun  4 20:02:13 2025 user.notice SQM: sqm_prepare_script: loading required kernel module: act_nssmirred
Wed Jun  4 20:02:13 2025 kern.err kernel: [   50.431191] __nss_qdisc_init[2380]:Qdisc ffffff8007e33000 (type 5): interface unknown to nss driver pppoe-wan
Wed Jun  4 20:02:13 2025 kern.warn kernel: [   50.431255] nss_qdisc_destroy[1948]:Qdisc ffffff8007e33000 (type 5): destroy not ready, state: -1
Wed Jun  4 20:02:13 2025 user.notice SQM: ERROR: cmd_wrapper: tc: FAILURE (2): /sbin/tc qdisc add dev pppoe-wan root handle 1: nsstbl rate 750000kbit burst 93574 mtu 1534 accel_mode 0
Wed Jun  4 20:02:13 2025 user.notice SQM: ERROR: cmd_wrapper: tc: LAST ERROR: RTNETLINK answers: Invalid argument
Wed Jun  4 20:02:13 2025 user.notice SQM: ERROR: cmd_wrapper: tc: FAILURE (2): /sbin/tc qdisc add dev pppoe-wan parent 1: handle 10: nssprio bands 3 accel_mode 0
Wed Jun  4 20:02:13 2025 user.notice SQM: ERROR: cmd_wrapper: tc: LAST ERROR: RTNETLINK answers: No such file or directory
Wed Jun  4 20:02:13 2025 user.notice SQM: ERROR: cmd_wrapper: tc: FAILURE (2): /sbin/tc qdisc add dev pppoe-wan parent 10:1 handle 100: nsstbl rate 75000kbit burst 9357 accel_mode 0
Wed Jun  4 20:02:13 2025 user.notice SQM: ERROR: cmd_wrapper: tc: LAST ERROR: RTNETLINK answers: No such file or directory
Wed Jun  4 20:02:13 2025 user.notice SQM: ERROR: cmd_wrapper: tc: FAILURE (2): /sbin/tc qdisc add dev pppoe-wan parent 100: handle 1000: nsspfifo limit 100 accel_mode 0
Wed Jun  4 20:02:13 2025 user.notice SQM: ERROR: cmd_wrapper: tc: LAST ERROR: RTNETLINK answers: No such file or directory
Wed Jun  4 20:02:13 2025 user.notice SQM: ERROR: cmd_wrapper: tc: FAILURE (2): /sbin/tc qdisc add dev pppoe-wan parent 10:2 handle 200: nsstbl rate 300000kbit burst 28072 accel_mode 0
Wed Jun  4 20:02:13 2025 user.notice SQM: ERROR: cmd_wrapper: tc: LAST ERROR: RTNETLINK answers: No such file or directory
Wed Jun  4 20:02:13 2025 user.notice SQM: ERROR: cmd_wrapper: tc: FAILURE (2): /sbin/tc qdisc add dev pppoe-wan parent 200: handle 2000: nssred limit 100k min 30k max 80k avpkt 1k burst 55 probability 0.50 accel_mode 0
Wed Jun  4 20:02:13 2025 user.notice SQM: ERROR: cmd_wrapper: tc: LAST ERROR: RTNETLINK answers: No such file or directory
Wed Jun  4 20:02:13 2025 user.notice SQM: ERROR: cmd_wrapper: tc: FAILURE (2): /sbin/tc qdisc add dev pppoe-wan parent 10:3 handle 300: nssfq_codel limit 6111 target 5ms flows 1024 quantum 1534 interval 100ms set_default accel_mode 0
Wed Jun  4 20:02:13 2025 user.notice SQM: ERROR: cmd_wrapper: tc: LAST ERROR: RTNETLINK answers: No such file or directory
Wed Jun  4 20:02:13 2025 user.notice SQM: sqm_start: egress shaping activated
Wed Jun  4 20:02:13 2025 kern.err kernel: [   50.531878] nss_mirred_init[143]:No NSS FW device found for pppoe-wan
Wed Jun  4 20:02:13 2025 user.notice SQM: ERROR: cmd_wrapper: tc: FAILURE (2): /sbin/tc filter add dev pppoe-wan parent ffff: protocol all u32 match u32 0 0 action nssmirred redirect dev ifb@pppoe-wan fromdev pppoe-wan
Wed Jun  4 20:02:13 2025 user.notice SQM: ERROR: cmd_wrapper: tc: LAST ERROR: RTNETLINK answers: No such device We have an error talking to the kernel
Wed Jun  4 20:02:13 2025 kern.err kernel: [   50.547194] __nss_qdisc_init[2380]:Qdisc ffffff801cf77400 (type 5): interface unknown to nss driver ifb@pppoe-wan
Wed Jun  4 20:02:13 2025 kern.warn kernel: [   50.547268] nss_qdisc_destroy[1948]:Qdisc ffffff801cf77400 (type 5): destroy not ready, state: -1
Wed Jun  4 20:02:13 2025 user.notice SQM: ERROR: cmd_wrapper: tc: FAILURE (2): /sbin/tc qdisc add dev ifb@pppoe-wan root handle 1: nsstbl rate 750000kbit burst 93574 mtu 1534 accel_mode 0
Wed Jun  4 20:02:13 2025 user.notice SQM: ERROR: cmd_wrapper: tc: LAST ERROR: RTNETLINK answers: Invalid argument
Wed Jun  4 20:02:13 2025 user.notice SQM: ERROR: cmd_wrapper: tc: FAILURE (2): /sbin/tc qdisc add dev ifb@pppoe-wan parent 1: handle 10: nssprio bands 3 accel_mode 0
Wed Jun  4 20:02:13 2025 user.notice SQM: ERROR: cmd_wrapper: tc: LAST ERROR: RTNETLINK answers: No such file or directory
Wed Jun  4 20:02:13 2025 user.notice SQM: ERROR: cmd_wrapper: tc: FAILURE (2): /sbin/tc qdisc add dev ifb@pppoe-wan parent 10:1 handle 100: nsstbl rate 75000kbit burst 9357 accel_mode 0
Wed Jun  4 20:02:13 2025 user.notice SQM: ERROR: cmd_wrapper: tc: LAST ERROR: RTNETLINK answers: No such file or directory
Wed Jun  4 20:02:13 2025 user.notice SQM: ERROR: cmd_wrapper: tc: FAILURE (2): /sbin/tc qdisc add dev ifb@pppoe-wan parent 100: handle 1000: nsspfifo limit 100 accel_mode 0
Wed Jun  4 20:02:13 2025 user.notice SQM: ERROR: cmd_wrapper: tc: LAST ERROR: RTNETLINK answers: No such file or directory
Wed Jun  4 20:02:13 2025 user.notice SQM: ERROR: cmd_wrapper: tc: FAILURE (2): /sbin/tc qdisc add dev ifb@pppoe-wan parent 10:2 handle 200: nsstbl rate 300000kbit burst 28072 accel_mode 0
Wed Jun  4 20:02:13 2025 user.notice SQM: ERROR: cmd_wrapper: tc: LAST ERROR: RTNETLINK answers: No such file or directory
Wed Jun  4 20:02:13 2025 user.notice SQM: ERROR: cmd_wrapper: tc: FAILURE (2): /sbin/tc qdisc add dev ifb@pppoe-wan parent 200: handle 2000: nssred limit 100k min 30k max 80k avpkt 1k burst 55 ecn probability 0.50 accel_mode 0
Wed Jun  4 20:02:13 2025 user.notice SQM: ERROR: cmd_wrapper: tc: LAST ERROR: RTNETLINK answers: No such file or directory
Wed Jun  4 20:02:13 2025 user.notice SQM: ERROR: cmd_wrapper: tc: FAILURE (2): /sbin/tc qdisc add dev ifb@pppoe-wan parent 10:3 handle 300: nssfq_codel limit 6111 target 5ms flows 1024 quantum 1534 interval 100ms set_default accel_mode 0
Wed Jun  4 20:02:13 2025 user.notice SQM: ERROR: cmd_wrapper: tc: LAST ERROR: RTNETLINK answers: No such file or directory
Wed Jun  4 20:02:13 2025 user.notice SQM: sqm_start: ingress shaping activated
Wed Jun  4 20:02:13 2025 user.notice SQM: nss-zk.qos was started on pppoe-wan successfully
Wed Jun  4 20:02:13 2025 user.notice firewall: Reloading firewall due to ifup of wan (pppoe-wan)

Here's what I gathered from "Unsaved Changes" while setting things up in luci.

# /etc/config/network:
uci set network.wan.proto='pppoe'
uci set network.wan.username='*****'
uci set network.wan.password='*****'
uci set network.wan.ipv6='auto'
uci set network.wan.mtu='1492'

uci add network device
uci set network.@device[-1].type='8021q'
uci set network.@device[-1].ifname='wan'
uci set network.@device[-1].vid='201'
uci set network.@device[-1].name='wan.201'
uci set network.wan.device='wan.201'

After some searching I came to believe that I should set up SQM on ppoe-wan, but I'm definitely not positive if that's the correct interface or whether I've got the correct overhead for ppoe and vlan tagging on the WAN.

# /etc/config/sqm:
config queue 'eth1'
        option enabled '1'
        option interface 'pppoe-wan'
        option download '750000'
        option upload '750000'
        option qdisc 'fq_codel'
        option script 'nss-zk.qos'
        option overhead '42'

Any help or pointers in the right direction would be greatly appreciated.