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libbpf: Support BTF_KIND_FLOAT during type compatibility checks in CO-RE

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Add BTF_KIND_FLOAT support when doing CO-RE field type compatibility check.
Without this, relocations against float/double fields will fail.

Also adjust one error message to emit instruction index instead of less
convenient instruction byte offset.

Fixes: 22541a9eeb0d ("libbpf: Add BTF_KIND_FLOAT support")
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Lorenz Bauer <lmb@cloudflare.com>
Link: https://lore.kernel.org/bpf/20210426192949.416837-3-andrii@kernel.org
This commit is contained in:
Andrii Nakryiko 2021-04-26 12:29:46 -07:00 committed by Andrii Nakryiko
parent b8b1faa3d4
commit 6b14cfa56e
1 changed files with 4 additions and 2 deletions
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6
src/libbpf.c
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@ -5115,6 +5115,7 @@ err_out:
* least one of enums should be anonymous;
* - for ENUMs, check sizes, names are ignored;
* - for INT, size and signedness are ignored;
* - any two FLOATs are always compatible;
* - for ARRAY, dimensionality is ignored, element types are checked for
* compatibility recursively;
* - everything else shouldn't be ever a target of relocation.
@ -5141,6 +5142,7 @@ recur:
switch (btf_kind(local_type)) {
case BTF_KIND_PTR:
case BTF_KIND_FLOAT:
return 1;
case BTF_KIND_FWD:
case BTF_KIND_ENUM: {
@ -6245,8 +6247,8 @@ patch_insn:
/* bpf_core_patch_insn() should know how to handle missing targ_spec */
err = bpf_core_patch_insn(prog, relo, relo_idx, &targ_res);
if (err) {
pr_warn("prog '%s': relo #%d: failed to patch insn at offset %d: %d\n",
prog->name, relo_idx, relo->insn_off, err);
pr_warn("prog '%s': relo #%d: failed to patch insn #%zu: %d\n",
prog->name, relo_idx, relo->insn_off / BPF_INSN_SZ, err);
return -EINVAL;
}