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From: Jesper Dangaard Brouer <brouer@redhat.com>
To: Daniel Borkmann <borkmann@iogearbox.net>,
	Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc: netdev@vger.kernel.org, Jesper Dangaard Brouer <brouer@redhat.com>
Subject: [RFC bpf-next PATCH] bpf: add comments to BPF ld/ldx sizes
Date: Tue, 16 Jan 2018 12:31:06 +0100	[thread overview]
Message-ID: <151610226596.29962.4661213256715212454.stgit@firesoul> (raw)

Doc BPF ld/ldx size defines, as it help me understand the code in filter.c.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
---
 0 files changed

diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 395d261948de..4729d9a002d4 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -17,7 +17,7 @@
 #define BPF_ALU64	0x07	/* alu mode in double word width */
 
 /* ld/ldx fields */
-#define BPF_DW		0x18	/* double word */
+#define BPF_DW		0x18	/* double word (64-bit) */
 #define BPF_XADD	0xc0	/* exclusive add */
 
 /* alu/jmp fields */
diff --git a/include/uapi/linux/bpf_common.h b/include/uapi/linux/bpf_common.h
index 18be90725ab0..ee97668bdadb 100644
--- a/include/uapi/linux/bpf_common.h
+++ b/include/uapi/linux/bpf_common.h
@@ -15,9 +15,10 @@
 
 /* ld/ldx fields */
 #define BPF_SIZE(code)  ((code) & 0x18)
-#define		BPF_W		0x00
-#define		BPF_H		0x08
-#define		BPF_B		0x10
+#define		BPF_W		0x00 /* 32-bit */
+#define		BPF_H		0x08 /* 16-bit */
+#define		BPF_B		0x10 /*  8-bit */
+/* eBPF		BPF_DW		0x18    64-bit */
 #define BPF_MODE(code)  ((code) & 0xe0)
 #define		BPF_IMM		0x00
 #define		BPF_ABS		0x20

             reply	other threads:[~2018-01-16 11:31 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-16 11:31 Jesper Dangaard Brouer [this message]
2018-01-16 23:21 ` [RFC bpf-next PATCH] bpf: add comments to BPF ld/ldx sizes Daniel Borkmann
2018-01-17 10:41   ` Jesper Dangaard Brouer

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