Re: xdp_iphash_to_cpu_cmdline: Error loading BTF: Invalid argument(22)

["Ethy H. Brito" <ethy.brito@inexo.com.br>]

On Tue, 22 Jun 2021 17:22:16 -0300
"Ethy"  wrote:

> Hi
> 
> Runing "# ./xdp_iphash_to_cpu --dev eth1 --all-cpus --wan" returns 2 loading errors:
> 
> ----------------------8<----------------------------------
> libbpf: Error loading BTF: Invalid argument(22)
> libbpf: magic: 0xeb9f
> version: 1
> flags: 0x0
> hdr_len: 24
> type_off: 0
> type_len: 492
> str_off: 492
> str_len: 1724
> btf_total_size: 2240
> [1] PTR (anon) type_id=2
> [2] STRUCT xdp_md size=20 vlen=5
> 	data type_id=3 bits_offset=0
> 	data_end type_id=3 bits_offset=32
> 	data_meta type_id=3 bits_offset=64
> 	ingress_ifindex type_id=3 bits_offset=96
> 	rx_queue_index type_id=3 bits_offset=128
> [3] TYPEDEF __u32 type_id=4
> [4] INT unsigned int size=4 bits_offset=0 nr_bits=32 encoding=(none)
> [5] FUNC_PROTO (anon) return=6 args=(1 ctx)
> [6] INT int size=4 bits_offset=0 nr_bits=32 encoding=SIGNED
> [7] FUNC xdp_program type_id=5 vlen != 0
> 
> libbpf: Error loading ELF section .BTF: -22. Ignored and continue.
> TC workaround for mapname: map_ifindex_type map_fd:5
> Added CPU:0 queue_size:192
> Added CPU:1 queue_size:192
> Added CPU:2 queue_size:192
> Added CPU:3 queue_size:192
> Added CPU:4 queue_size:192
> Added CPU:5 queue_size:192
> Added CPU:6 queue_size:192
> Added CPU:7 queue_size:192
> Added CPU:8 queue_size:192
> Added CPU:9 queue_size:192
> Added CPU:10 queue_size:192
> Added CPU:11 queue_size:192
> Added CPU:12 queue_size:192
> Added CPU:13 queue_size:192
> Added CPU:14 queue_size:192
> Added CPU:15 queue_size:192
> Documentation:
>  XDP: Lookup IPv4 and redirect to CPU hash
> 
> This program loads the XDP eBPF program into the kernel.
> Use the cmdline tool for add/removing dest IPs to the hash
> 
>  - Attached to device:eth1 (ifindex:4) prog_id:73
> ----------------------------------8<-------------------------------
> 
> Since the XDP program was correctly listed by "bpftool net", I continued an added just ONE ip
> 
> # ./xdp_iphash_to_cpu_cmdline --add --ip 1.2.3.4 --classid 1:1234 --cpu 1
> key: 0x4030201
> WARN: Looks like map_txq_config --base-setup is missing
> WARN: Fixing, doing map_txq_config --base-setup
> iphash_modify() IP:1.2.3.4 key:0x4030201 TC-handle:0x11234
> 
> listed the map
> 
> # ./xdp_iphash_to_cpu_cmdline --list
> {
> "1.2.3.4" : { "cpu" : 1, "tc_maj" : "1" , "tc_min" : "1234" }}
> 
> 
> And right after I tried to remove the program from XDP:
> 
> # ./xdp_iphash_to_cpu --dev eth1 --remove
> Removing XDP program on ifindex:4 device:eth1
> ERR: Clear ifindex type failed 
> INFO: not cleanup pinned map file:/sys/fs/bpf/tc/globals/map_ip_hash (use 'rm')
> 
> All seems to be rigth despite the errors.
> Are all these errors and warnings serious problems? Should I worry? 
> 
> Hints??

Hi.

Doesn't anybody know how to answer these?

Regards

Ethy