xdp-tools: add IFB setup in tc-basic-classifier

commit f0812939ca4f6332d34715673c4fe44fbb1a491b (HEAD -> main, origin/main, origin/HEAD)
    Author: Vincent Li <vincent.mc.li@gmail.com>
    Date:   Mon Nov 3 21:46:30 2025 -0800

        tc-basic-classifier: add IFB setup in user space

        Add the required kernel modules setup and green0 ingress mirror to ifb0
        egress setup in class_filter so it is easier for user. see [0] for
        required kernel modules and ingress shaping. also change the default
        path to /usr/lib/bpf/class_filter.bpf.o  also change the default bpf
        object path to /usr/lib/bpf/class_filter.bpf.o.

        [0]: https://std.rocks/gnulinux_network_traffic_control.html

        for example:

        Complete setup with one command (IFB mirroring + BPF attachment)

        ./class_filter -i green0 -3 10mbit -I -a -v

        Setting up IFB mirroring for ingress traffic shaping on green0
        Loading required kernel modules...
        Executing: modprobe ifb numifbs=1
        Loaded module: ifb numifbs=1
        Executing: modprobe sch_fq_codel
        Loaded module: sch_fq_codel
        Executing: modprobe act_mirred
        Loaded module: act_mirred
        Executing: modprobe act_connmark
        Loaded module: act_connmark
        Successfully loaded all required kernel modules
        Executing: ip link set dev ifb0 up
        Executing: tc qdisc del dev green0 ingress 2>/dev/null
        Executing: tc qdisc add dev green0 ingress handle ffff:
        Executing: tc filter add dev green0 parent ffff: protocol ip u32 match u32 0 0 action connmark action mirred egress redirect dev ifb0 flowid ffff:1
        Successfully setup IFB mirroring:
          - Ingress traffic from green0 mirrored to ifb0 egress

        Verification - IFB status:
        Executing: ip link show ifb0
        7: ifb0: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc htb state UNKNOWN mode DEFAULT group default qlen 32
            link/ether 8e:52:c9:93:13:34 brd ff:ff:ff:ff:ff:ff

        TC configuration on green0 ingress:
        Executing: tc qdisc show dev green0
        qdisc fq_codel 8001: root refcnt 9 limit 10240p flows 1024 quantum 1514 target 5ms interval 100ms memory_limit 32Mb ecn drop_batch 64
        qdisc ingress ffff: parent ffff:fff1 ----------------
        Executing: tc filter show dev green0 parent ffff:
        filter protocol ip pref 49152 u32 chain 0
        filter protocol ip pref 49152 u32 chain 0 fh 800: ht divisor 1
        filter protocol ip pref 49152 u32 chain 0 fh 800::800 order 2048 key ht 800 bkt 0 flowid ffff:1 not_in_hw
          match 00000000/00000000 at 0
                action order 1: connmark zone 0 pipe
                 index 1 ref 1 bind 1

                action order 2: mirred (Egress Redirect to device ifb0) stolen
                index 1 ref 1 bind 1

        Setting up TC qdisc and classes on ifb0 for egress shaping...
        Executing: tc qdisc del dev ifb0 root 2>/dev/null
        Executing: tc qdisc add dev ifb0 root handle 1:0 htb default 30
        Executing: tc class add dev ifb0 parent 1:0 classid 1:1 htb rate 100mbit
        Warning: sch_htb: quantum of class 10001 is big. Consider r2q change.
        Executing: tc class add dev ifb0 parent 1:1 classid 1:30 htb rate 5mbit ceil 10mbit
        Successfully setup TC qdisc and classes on ifb0

        TC configuration on ifb0:
        Executing: tc qdisc show dev ifb0
        qdisc htb 1: root refcnt 2 r2q 10 default 0x30 direct_packets_stat 1 direct_qlen 32
        Executing: tc class show dev ifb0
        class htb 1:1 root rate 100Mbit ceil 100Mbit burst 1600b cburst 1600b
        class htb 1:30 parent 1:1 prio 0 rate 5Mbit ceil 10Mbit burst 1600b cburst 1600b

        Automatically attaching BPF program to ifb0 for classification...
        Attaching BPF program to ifb0...
        Executing: tc filter del dev ifb0 protocol ip parent 1:0 2>/dev/null
        Command failed but ignoring (may be normal): tc filter del dev ifb0 protocol ip parent 1:0 2>/dev/null
        Executing: tc filter add dev ifb0 protocol ip parent 1:0 bpf obj ./class_filter.bpf.o classid 1: direct-action
        Successfully attached BPF program to ifb0 egress (parent 1:0)
        BPF maps automatically pinned to /sys/fs/bpf/tc/globals/
        Verification:
        Executing: tc filter show dev ifb0 parent 1:0
        filter protocol ip pref 49152 bpf chain 0
        filter protocol ip pref 49152 bpf chain 0 handle 0x1 flowid 1: class_filter.bpf.o:[classifier] direct-action not_in_hw id 100 name cls_filter tag 7163f8c072cf7015 jited
        Pinned maps:
        Executing: ls -la /sys/fs/bpf/tc/globals/ 2>/dev/null || echo 'No pinned maps found'
        total 0
        drwx------ 2 root root 0 Nov  3 11:43 .
        drwx------ 3 root root 0 Nov  3 11:24 ..
        -rw------- 1 root root 0 Nov  3 11:43 cls_filter_ip_trie_map
        -rw------- 1 root root 0 Nov  3 11:43 cls_filter_port_map

        Complete setup finished:
          - IFB mirroring configured on green0 -> ifb0
          - TC qdisc and classes setup on ifb0
          - BPF classifier attached to ifb0 egress
          - Ready for port/IP based traffic classification!

        Signed-off-by: Vincent Li <vincent.mc.li@gmail.com>

Signed-off-by: Vincent Li <vincent.mc.li@gmail.com>

lfs/xdp-tools

@@ -41,7 +41,7 @@ objects = $(DL_FILE)
 
 $(DL_FILE) = $(DL_FROM)/$(DL_FILE)
 
-$(DL_FILE)_BLAKE2 = 74cf44992416a9a5c8e30985089e651b0b11ffabf192fd3dc066f95420ba27cbba039641fcffe0adbe682cd0d8572c5565980ab9928fad60dadb288a1d44cc08
+$(DL_FILE)_BLAKE2 = 3262f2c34ed70ae06f1262ed629dc50562e1dfe6045db8ee3e6e4fd0540e1ae62009b12dc235a565ee88fc5a1a6ef24fbb3063c694feef37e876ca940954b92c
 
 install : $(TARGET)