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bpf: Refactor trampoline update code

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As we need to introduce a third type of attachment for trampolines, the
flattened signature of arch_prepare_bpf_trampoline gets even more
complicated.

Refactor the prog and count argument to arch_prepare_bpf_trampoline to
use bpf_tramp_progs to simplify the addition and accounting for new
attachment types.

Signed-off-by: KP Singh <kpsingh@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20200304191853.1529-2-kpsingh@chromium.org
This commit is contained in:
KP Singh
2020-03-04 20:18:47 +01:00
committed by Alexei Starovoitov
parent cc6fa77102
commit 88fd9e5352
4 changed files with 71 additions and 45 deletions
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10
kernel/bpf/bpf_struct_ops.c
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@@ -320,6 +320,7 @@ static int bpf_struct_ops_map_update_elem(struct bpf_map *map, void *key,
struct bpf_struct_ops_value *uvalue, *kvalue;
const struct btf_member *member;
const struct btf_type *t = st_ops->type;
struct bpf_tramp_progs *tprogs = NULL;
void *udata, *kdata;
int prog_fd, err = 0;
void *image;
@@ -343,6 +344,10 @@ static int bpf_struct_ops_map_update_elem(struct bpf_map *map, void *key,
if (uvalue->state || refcount_read(&uvalue->refcnt))
return -EINVAL;
tprogs = kcalloc(BPF_TRAMP_MAX, sizeof(*tprogs), GFP_KERNEL);
if (!tprogs)
return -ENOMEM;
uvalue = (struct bpf_struct_ops_value *)st_map->uvalue;
kvalue = (struct bpf_struct_ops_value *)&st_map->kvalue;
@@ -425,10 +430,12 @@ 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;
err = arch_prepare_bpf_trampoline(image,
st_map->image + PAGE_SIZE,
&st_ops->func_models[i], 0,
&prog, 1, NULL, 0, NULL);
tprogs, NULL);
if (err < 0)
goto reset_unlock;
@@ -469,6 +476,7 @@ reset_unlock:
memset(uvalue, 0, map->value_size);
memset(kvalue, 0, map->value_size);
unlock:
kfree(tprogs);
mutex_unlock(&st_map->lock);
return err;
}