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bpf: Factor out a helper to prepare trampoline for struct_ops prog

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Factor out a helper bpf_struct_ops_prepare_trampoline() to prepare
trampoline for BPF_PROG_TYPE_STRUCT_OPS prog. It will be used by
.test_run callback in following patch.

Signed-off-by: Hou Tao <houtao1@huawei.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20211025064025.2567443-2-houtao1@huawei.com
This commit is contained in:
Hou Tao 2021-10-25 14:40:22 +08:00 committed by Alexei Starovoitov
parent 36e70b9b06
commit 31a645aea4
2 changed files with 23 additions and 10 deletions
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4
include/linux/bpf.h
View File

@ -1000,6 +1000,10 @@ bool bpf_struct_ops_get(const void *kdata);
void bpf_struct_ops_put(const void *kdata);
int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map, void *key,
void *value);
int bpf_struct_ops_prepare_trampoline(struct bpf_tramp_progs *tprogs,
struct bpf_prog *prog,
const struct btf_func_model *model,
void *image, void *image_end);
static inline bool bpf_try_module_get(const void *data, struct module *owner)
{
if (owner == BPF_MODULE_OWNER)

29
kernel/bpf/bpf_struct_ops.c
View File

@ -312,6 +312,20 @@ static int check_zero_holes(const struct btf_type *t, void *data)
return 0;
}
int bpf_struct_ops_prepare_trampoline(struct bpf_tramp_progs *tprogs,
struct bpf_prog *prog,
const struct btf_func_model *model,
void *image, void *image_end)
{
u32 flags;
tprogs[BPF_TRAMP_FENTRY].progs[0] = prog;
tprogs[BPF_TRAMP_FENTRY].nr_progs = 1;
flags = model->ret_size > 0 ? BPF_TRAMP_F_RET_FENTRY_RET : 0;
return arch_prepare_bpf_trampoline(NULL, image, image_end,
model, flags, tprogs, NULL);
}
static int bpf_struct_ops_map_update_elem(struct bpf_map *map, void *key,
void *value, u64 flags)
{
@ -323,7 +337,7 @@ static int bpf_struct_ops_map_update_elem(struct bpf_map *map, void *key,
struct bpf_tramp_progs *tprogs = NULL;
void *udata, *kdata;
int prog_fd, err = 0;
void *image;
void *image, *image_end;
u32 i;
if (flags)
@ -363,12 +377,12 @@ static int bpf_struct_ops_map_update_elem(struct bpf_map *map, void *key,
udata = &uvalue->data;
kdata = &kvalue->data;
image = st_map->image;
image_end = st_map->image + PAGE_SIZE;
for_each_member(i, t, member) {
const struct btf_type *mtype, *ptype;
struct bpf_prog *prog;
u32 moff;
u32 flags;
moff = btf_member_bit_offset(t, member) / 8;
ptype = btf_type_resolve_ptr(btf_vmlinux, member->type, NULL);
@ -430,14 +444,9 @@ static int bpf_struct_ops_map_update_elem(struct bpf_map *map, void *key,
goto reset_unlock;
}
tprogs[BPF_TRAMP_FENTRY].progs[0] = prog;
tprogs[BPF_TRAMP_FENTRY].nr_progs = 1;
flags = st_ops->func_models[i].ret_size > 0 ?
BPF_TRAMP_F_RET_FENTRY_RET : 0;
err = arch_prepare_bpf_trampoline(NULL, image,
st_map->image + PAGE_SIZE,
&st_ops->func_models[i],
flags, tprogs, NULL);
err = bpf_struct_ops_prepare_trampoline(tprogs, prog,
&st_ops->func_models[i],
image, image_end);
if (err < 0)
goto reset_unlock;