From: "Björn Töpel" <bjorn.topel@gmail.com>
To: ast@kernel.org, daniel@iogearbox.net, netdev@vger.kernel.org,
bpf@vger.kernel.org
Cc: "Björn Töpel" <bjorn.topel@intel.com>,
magnus.karlsson@intel.com, jackmanb@google.com
Subject: [PATCH bpf-next] samples/bpf: add BPF_ATOMIC_OP macro for BPF samples
Date: Mon, 18 Jan 2021 10:17:53 +0100 [thread overview]
Message-ID: <20210118091753.107572-1-bjorn.topel@gmail.com> (raw)
From: Björn Töpel <bjorn.topel@intel.com>
Brendan Jackman added extend atomic operations to the BPF instruction
set in commit 7064a7341a0d ("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.
Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
---
samples/bpf/bpf_insn.h | 24 ++++++++++++++++++++----
1 file changed, 20 insertions(+), 4 deletions(-)
diff --git a/samples/bpf/bpf_insn.h b/samples/bpf/bpf_insn.h
index db67a2847395..aee04534483a 100644
--- a/samples/bpf/bpf_insn.h
+++ b/samples/bpf/bpf_insn.h
@@ -134,15 +134,31 @@ struct bpf_insn;
.off = OFF, \
.imm = 0 })
-/* Atomic memory add, *(uint *)(dst_reg + off16) += src_reg */
-
-#define BPF_STX_XADD(SIZE, DST, SRC, OFF) \
+/*
+ * 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_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 */
base-commit: 232164e041e925a920bfd28e63d5233cfad90b73
--
2.27.0
next reply other threads:[~2021-01-18 20:31 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-18 9:17 Björn Töpel [this message]
2021-01-18 10:57 ` [PATCH bpf-next] samples/bpf: add BPF_ATOMIC_OP macro for BPF samples Brendan Jackman
2021-01-18 11:00 ` Björn Töpel
2021-01-18 23:00 ` patchwork-bot+netdevbpf
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