Le 06/03/2024 à 21:05, Calvin Owens a écrit : > [Vous ne recevez pas souvent de courriers de jcalvinowens@xxxxxxxxx. Découvrez pourquoi ceci est important à https://aka.ms/LearnAboutSenderIdentification ] > > No BPF code has to change, except in struct_ops (for module refs). > > This conflicts with bpf-next because of this (relevant) series: > > https://lore.kernel.org/all/20240119225005.668602-1-thinker.li@xxxxxxxxx/ > > If something like this is merged down the road, it can go through > bpf-next at leisure once the module_alloc change is in: it's a one-way > dependency. > > Signed-off-by: Calvin Owens <jcalvinowens@xxxxxxxxx> > --- > kernel/bpf/Kconfig | 2 +- > kernel/bpf/bpf_struct_ops.c | 28 ++++++++++++++++++++++++---- > 2 files changed, 25 insertions(+), 5 deletions(-) > > diff --git a/kernel/bpf/Kconfig b/kernel/bpf/Kconfig > index 6a906ff93006..77df483a8925 100644 > --- a/kernel/bpf/Kconfig > +++ b/kernel/bpf/Kconfig > @@ -42,7 +42,7 @@ config BPF_JIT > bool "Enable BPF Just In Time compiler" > depends on BPF > depends on HAVE_CBPF_JIT || HAVE_EBPF_JIT > - depends on MODULES > + select MODULE_ALLOC > help > BPF programs are normally handled by a BPF interpreter. This option > allows the kernel to generate native code when a program is loaded > diff --git a/kernel/bpf/bpf_struct_ops.c b/kernel/bpf/bpf_struct_ops.c > index 02068bd0e4d9..fbf08a1bb00c 100644 > --- a/kernel/bpf/bpf_struct_ops.c > +++ b/kernel/bpf/bpf_struct_ops.c > @@ -108,11 +108,30 @@ const struct bpf_prog_ops bpf_struct_ops_prog_ops = { > #endif > }; > > +#if IS_ENABLED(CONFIG_MODULES) Can you avoid ifdefs as much as possible ? > static const struct btf_type *module_type; > > +static int bpf_struct_module_type_init(struct btf *btf) > +{ > + s32 module_id; Could be: if (!IS_ENABLED(CONFIG_MODULES)) return 0; > + > + module_id = btf_find_by_name_kind(btf, "module", BTF_KIND_STRUCT); > + if (module_id < 0) > + return 1; > + > + module_type = btf_type_by_id(btf, module_id); > + return 0; > +} > +#else > +static int bpf_struct_module_type_init(struct btf *btf) > +{ > + return 0; > +} > +#endif > + > void bpf_struct_ops_init(struct btf *btf, struct bpf_verifier_log *log) > { > - s32 type_id, value_id, module_id; > + s32 type_id, value_id; > const struct btf_member *member; > struct bpf_struct_ops *st_ops; > const struct btf_type *t; > @@ -125,12 +144,10 @@ void bpf_struct_ops_init(struct btf *btf, struct bpf_verifier_log *log) > #include "bpf_struct_ops_types.h" > #undef BPF_STRUCT_OPS_TYPE > > - module_id = btf_find_by_name_kind(btf, "module", BTF_KIND_STRUCT); > - if (module_id < 0) { > + if (bpf_struct_module_type_init(btf)) { > pr_warn("Cannot find struct module in btf_vmlinux\n"); > return; > } > - module_type = btf_type_by_id(btf, module_id); > > for (i = 0; i < ARRAY_SIZE(bpf_struct_ops); i++) { > st_ops = bpf_struct_ops[i]; > @@ -433,12 +450,15 @@ static long bpf_struct_ops_map_update_elem(struct bpf_map *map, void *key, > > moff = __btf_member_bit_offset(t, member) / 8; > ptype = btf_type_resolve_ptr(btf_vmlinux, member->type, NULL); > + > +#if IS_ENABLED(CONFIG_MODULES) Can't see anything depending on CONFIG_MODULES here, can you instead do: if (IS_ENABLED(CONFIG_MODULES) && ptype == module_type) { > if (ptype == module_type) { > if (*(void **)(udata + moff)) > goto reset_unlock; > *(void **)(kdata + moff) = BPF_MODULE_OWNER; > continue; > } > +#endif > > err = st_ops->init_member(t, member, kdata, udata); > if (err < 0) > -- > 2.43.0 > >
