libbpf: Add SEC name for xdp frags programs

Introduce support for the following SEC entries for XDP frags
property:
- SEC("xdp.frags")
- SEC("xdp.frags/devmap")
- SEC("xdp.frags/cpumap")

Acked-by: Toke Hoiland-Jorgensen <toke@redhat.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://lore.kernel.org/r/af23b6e4841c171ad1af01917839b77847a4bc27.1642758637.git.lorenzo@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index fc6d530..a8c7503 100644 (file)
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -235,6 +235,8 @@ enum sec_def_flags {
        SEC_SLEEPABLE = 8,
        /* allow non-strict prefix matching */
        SEC_SLOPPY_PFX = 16,
+       /* BPF program support non-linear XDP buffer */
+       SEC_XDP_FRAGS = 32,
 };
 
 struct bpf_sec_def {
@@ -6570,6 +6572,9 @@ static int libbpf_preload_prog(struct bpf_program *prog,
        if (def & SEC_SLEEPABLE)
                opts->prog_flags |= BPF_F_SLEEPABLE;
 
+       if (prog->type == BPF_PROG_TYPE_XDP && (def & SEC_XDP_FRAGS))
+               opts->prog_flags |= BPF_F_XDP_HAS_FRAGS;
+
        if ((prog->type == BPF_PROG_TYPE_TRACING ||
             prog->type == BPF_PROG_TYPE_LSM ||
             prog->type == BPF_PROG_TYPE_EXT) && !prog->attach_btf_id) {
@@ -8608,8 +8613,11 @@ static const struct bpf_sec_def section_defs[] = {
        SEC_DEF("lsm.s/",               LSM, BPF_LSM_MAC, SEC_ATTACH_BTF | SEC_SLEEPABLE, attach_lsm),
        SEC_DEF("iter/",                TRACING, BPF_TRACE_ITER, SEC_ATTACH_BTF, attach_iter),
        SEC_DEF("syscall",              SYSCALL, 0, SEC_SLEEPABLE),
+       SEC_DEF("xdp.frags/devmap",     XDP, BPF_XDP_DEVMAP, SEC_XDP_FRAGS),
        SEC_DEF("xdp_devmap/",          XDP, BPF_XDP_DEVMAP, SEC_ATTACHABLE),
+       SEC_DEF("xdp.frags/cpumap",     XDP, BPF_XDP_CPUMAP, SEC_XDP_FRAGS),
        SEC_DEF("xdp_cpumap/",          XDP, BPF_XDP_CPUMAP, SEC_ATTACHABLE),
+       SEC_DEF("xdp.frags",            XDP, BPF_XDP, SEC_XDP_FRAGS),
        SEC_DEF("xdp",                  XDP, BPF_XDP, SEC_ATTACHABLE_OPT | SEC_SLOPPY_PFX),
        SEC_DEF("perf_event",           PERF_EVENT, 0, SEC_NONE | SEC_SLOPPY_PFX),
        SEC_DEF("lwt_in",               LWT_IN, 0, SEC_NONE | SEC_SLOPPY_PFX),