Andrii Nakryiko <andrii.nakryiko@xxxxxxxxx> writes: > On Mon, Jul 12, 2021 at 11:35 PM luwei (O) <luwei32@xxxxxxxxxx> wrote: >> >> Hi, List: >> >> I am a beginner about bpf and working on XDP now. I meet a >> problem and feel difficult to figure it out. >> >> In my following codes, I use two ways to define my_map: in SEC >> maps and SEC .maps respectively. When I load the xdp_kern.o file, >> >> It has different results. The way I load is: ip link set dev ens3 xdp >> obj xdp1_kern.o sec xdp1. >> >> when I define my_map using SEC maps, it loads successfully but >> fails to load using SEC .maps, it reports: >> >> " >> >> [12] TYPEDEF __u32 type_id=13 >> [13] INT unsigned int size=4 bits_offset=0 nr_bits=32 encoding=(none) >> [14] FUNC_PROTO (anon) return=2 args=(10 ctx) >> [15] FUNC xdp_prog1 type_id=14 >> [16] INT char size=1 bits_offset=0 nr_bits=8 encoding=SIGNED >> [17] ARRAY (anon) type_id=16 index_type_id=4 nr_elems=4 >> [18] VAR _license type_id=17 linkage=1 >> [19] DATASEC .maps size=0 vlen=1 size == 0 >> >> >> Prog section 'xdp1' rejected: Permission denied (13)! >> - Type: 6 >> - Instructions: 9 (0 over limit) >> - License: GPL >> >> Verifier analysis: >> >> 0: (b7) r1 = 0 >> 1: (63) *(u32 *)(r10 -4) = r1 >> last_idx 1 first_idx 0 >> regs=2 stack=0 before 0: (b7) r1 = 0 >> 2: (bf) r2 = r10 >> 3: (07) r2 += -4 >> 4: (18) r1 = 0x0 > > this shouldn't be 0x0. > > I suspect you have an old iproute2 which doesn't yet use libbpf to > load BPF programs, so .maps definition is not yet supported. cc'ing > netdev@vger, David and Toke That would be my guess as well; what's the output of 'ip -V'? -Toke
