diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/bpf.h | 15 | ||||
| -rw-r--r-- | include/linux/filter.h | 31 |
2 files changed, 31 insertions, 15 deletions
diff --git a/include/linux/bpf.h b/include/linux/bpf.h index 73bacfc6444d..d79bf7557ef6 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -1132,21 +1132,6 @@ static inline bool bpf_pseudo_func(const struct bpf_insn *insn) return bpf_is_ldimm64(insn) && insn->src_reg == BPF_PSEUDO_FUNC; } -/* Given a BPF_ATOMIC instruction @atomic_insn, return true if it is an - * atomic load or store, and false if it is a read-modify-write instruction. - */ -static inline bool -bpf_atomic_is_load_store(const struct bpf_insn *atomic_insn) -{ - switch (atomic_insn->imm) { - case BPF_LOAD_ACQ: - case BPF_STORE_REL: - return true; - default: - return false; - } -} - struct bpf_prog_ops { int (*test_run)(struct bpf_prog *prog, const union bpf_attr *kattr, union bpf_attr __user *uattr); diff --git a/include/linux/filter.h b/include/linux/filter.h index 32d5297c557e..41b02d53e222 100644 --- a/include/linux/filter.h +++ b/include/linux/filter.h @@ -383,6 +383,37 @@ static inline bool insn_is_cast_user(const struct bpf_insn *insn) /* Legacy alias */ #define BPF_STX_XADD(SIZE, DST, SRC, OFF) BPF_ATOMIC_OP(SIZE, BPF_ADD, DST, SRC, OFF) +/* + * Given a BPF_ATOMIC instruction @atomic_insn, return true if it is an + * atomic load or store, and false if it is a read-modify-write instruction. + */ +static inline bool +bpf_atomic_is_load_store(const struct bpf_insn *atomic_insn) +{ + switch (atomic_insn->imm) { + case BPF_LOAD_ACQ: + case BPF_STORE_REL: + return true; + default: + return false; + } +} + +/* + * A load-acquire is the only BPF_STX class instruction that reads into + * dst_reg from src_reg + off16, i.e. it has the operand roles of a BPF_LDX. + * Unlike bpf_atomic_is_load_store(), @insn is not assumed to be a BPF_ATOMIC + * instruction here, so that callers which walk all instruction classes can + * use this directly. + */ +static inline bool bpf_atomic_is_load_acq(const struct bpf_insn *insn) +{ + return BPF_CLASS(insn->code) == BPF_STX && + (BPF_MODE(insn->code) == BPF_ATOMIC || + BPF_MODE(insn->code) == BPF_PROBE_ATOMIC) && + insn->imm == BPF_LOAD_ACQ; +} + /* Memory store, *(uint *) (dst_reg + off16) = imm32 */ #define BPF_ST_MEM(SIZE, DST, OFF, IMM) \ |