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samples/bpf: Add BPF_ATOMIC_OP macro for BPF samples 

Brendan Jackman added extend atomic operations to the BPF instruction
set in commit 7064a7341a ("Merge branch 'Atomics for eBPF'"), which
introduces the BPF_ATOMIC_OP macro. However, that macro was missing
for the BPF samples. Fix that by adding it into bpf_insn.h.

Fixes: 91c960b005 ("bpf: Rename BPF_XADD and prepare to encode other atomics in .imm")
Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Brendan Jackman <jackmanb@google.com>
Link: https://lore.kernel.org/bpf/20210118091753.107572-1-bjorn.topel@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Björn Töpel 2021-01-18 10:17:53 +01:00 committed by Alexei Starovoitov
parent 89f479f0ec
commit da9d35e2f2
1 changed files with 19 additions and 3 deletions
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22
samples/bpf/bpf_insn.h
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@ -134,15 +134,31 @@ struct bpf_insn;
.off = OFF, \
.imm = 0 })
/* Atomic memory add, *(uint *)(dst_reg + off16) += src_reg */
/*
* Atomic operations:
*
* BPF_ADD *(uint *) (dst_reg + off16) += src_reg
* BPF_AND *(uint *) (dst_reg + off16) &= src_reg
* BPF_OR *(uint *) (dst_reg + off16) |= src_reg
* BPF_XOR *(uint *) (dst_reg + off16) ^= src_reg
* BPF_ADD | BPF_FETCH src_reg = atomic_fetch_add(dst_reg + off16, src_reg);
* BPF_AND | BPF_FETCH src_reg = atomic_fetch_and(dst_reg + off16, src_reg);
* BPF_OR | BPF_FETCH src_reg = atomic_fetch_or(dst_reg + off16, src_reg);
* BPF_XOR | BPF_FETCH src_reg = atomic_fetch_xor(dst_reg + off16, src_reg);
* BPF_XCHG src_reg = atomic_xchg(dst_reg + off16, src_reg)
* BPF_CMPXCHG r0 = atomic_cmpxchg(dst_reg + off16, r0, src_reg)
*/
#define BPF_STX_XADD(SIZE, DST, SRC, OFF) \
#define BPF_ATOMIC_OP(SIZE, OP, DST, SRC, OFF) \
((struct bpf_insn) { \
.code = BPF_STX | BPF_SIZE(SIZE) | BPF_ATOMIC, \
.dst_reg = DST, \
.src_reg = SRC, \
.off = OFF, \
.imm = BPF_ADD })
.imm = OP })
/* Legacy alias */
#define BPF_STX_XADD(SIZE, DST, SRC, OFF) BPF_ATOMIC_OP(SIZE, BPF_ADD, DST, SRC, OFF)
/* Memory store, *(uint *) (dst_reg + off16) = imm32 */