linux-kernel - [PATCH bpf-next v2 3/5] libbpf: make BPF

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Date:   Fri,  2 Jun 2023 14:59:56 +0800
From:   menglong8.dong@...il.com
To:     olsajiri@...il.com
Cc:     davem@...emloft.net, dsahern@...nel.org, ast@...nel.org,
        daniel@...earbox.net, andrii@...nel.org, martin.lau@...ux.dev,
        song@...nel.org, yhs@...com, john.fastabend@...il.com,
        kpsingh@...nel.org, sdf@...gle.com, haoluo@...gle.com,
        jolsa@...nel.org, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, dave.hansen@...ux.intel.com, x86@...nel.org,
        hpa@...or.com, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, mykolal@...com, shuah@...nel.org,
        benbjiang@...cent.com, iii@...ux.ibm.com, imagedong@...cent.com,
        xukuohai@...wei.com, chantr4@...il.com, zwisler@...gle.com,
        eddyz87@...il.com, netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: [PATCH bpf-next v2 3/5] libbpf: make BPF_PROG support 15 function arguments

From: Menglong Dong <imagedong@...cent.com>

Now that we changed MAX_BPF_FUNC_ARGS from 12 to 14, we should update
BPF_PROG() too.

Extend BPF_PROG() to make it support 15 arguments, 14 for kernel
function arguments and 1 for return value of FEXIT.

Reviewed-by: Jiang Biao <benbjiang@...cent.com>
Signed-off-by: Menglong Dong <imagedong@...cent.com>
---
 tools/lib/bpf/bpf_helpers.h |  9 ++++++---
 tools/lib/bpf/bpf_tracing.h | 10 ++++++++--
 2 files changed, 14 insertions(+), 5 deletions(-)

diff --git a/tools/lib/bpf/bpf_helpers.h b/tools/lib/bpf/bpf_helpers.h
index bbab9ad9dc5a..d1574491cf16 100644
--- a/tools/lib/bpf/bpf_helpers.h
+++ b/tools/lib/bpf/bpf_helpers.h
@@ -194,11 +194,13 @@ enum libbpf_tristate {
 #define ___bpf_apply(fn, n) ___bpf_concat(fn, n)
 #endif
 #ifndef ___bpf_nth
-#define ___bpf_nth(_, _1, _2, _3, _4, _5, _6, _7, _8, _9, _a, _b, _c, N, ...) N
+#define ___bpf_nth(_, _1, _2, _3, _4, _5, _6, _7, _8, _9, _a, _b, _c,	\
+		   _d, _e, _f, N, ...) N
 #endif
 #ifndef ___bpf_narg
 #define ___bpf_narg(...) \
-	___bpf_nth(_, ##__VA_ARGS__, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0)
+	___bpf_nth(_, ##__VA_ARGS__, 15, 14, 13, 12, 11, 10, 9, 8, 7,	\
+		   6, 5, 4, 3, 2, 1, 0)
 #endif
 
 #define ___bpf_fill0(arr, p, x) do {} while (0)
@@ -290,7 +292,8 @@ enum libbpf_tristate {
 #define ___bpf_pick_printk(...) \
 	___bpf_nth(_, ##__VA_ARGS__, __bpf_vprintk, __bpf_vprintk, __bpf_vprintk,	\
 		   __bpf_vprintk, __bpf_vprintk, __bpf_vprintk, __bpf_vprintk,		\
-		   __bpf_vprintk, __bpf_vprintk, __bpf_printk /*3*/, __bpf_printk /*2*/,\
+		   __bpf_vprintk, __bpf_vprintk, __bpf_vprintk, __bpf_vprintk,		\
+		   __bpf_vprintk, __bpf_printk /*3*/, __bpf_printk /*2*/,		\
 		   __bpf_printk /*1*/, __bpf_printk /*0*/)
 
 /* Helper macro to print out debug messages */
diff --git a/tools/lib/bpf/bpf_tracing.h b/tools/lib/bpf/bpf_tracing.h
index be076a4041ab..4e940239f1c1 100644
--- a/tools/lib/bpf/bpf_tracing.h
+++ b/tools/lib/bpf/bpf_tracing.h
@@ -628,10 +628,13 @@ struct pt_regs;
 #define ___bpf_apply(fn, n) ___bpf_concat(fn, n)
 #endif
 #ifndef ___bpf_nth
-#define ___bpf_nth(_, _1, _2, _3, _4, _5, _6, _7, _8, _9, _a, _b, _c, N, ...) N
+#define ___bpf_nth(_, _1, _2, _3, _4, _5, _6, _7, _8, _9, _a, _b, _c,	\
+		   _d, _e, _f, N, ...) N
 #endif
 #ifndef ___bpf_narg
-#define ___bpf_narg(...) ___bpf_nth(_, ##__VA_ARGS__, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0)
+#define ___bpf_narg(...) \
+	___bpf_nth(_, ##__VA_ARGS__, 15, 14, 13, 12, 11, 10, 9, 8, 7,	\
+		   6, 5, 4, 3, 2, 1, 0)
 #endif
 
 #define ___bpf_ctx_cast0()            ctx
@@ -647,6 +650,9 @@ struct pt_regs;
 #define ___bpf_ctx_cast10(x, args...) ___bpf_ctx_cast9(args), (void *)ctx[9]
 #define ___bpf_ctx_cast11(x, args...) ___bpf_ctx_cast10(args), (void *)ctx[10]
 #define ___bpf_ctx_cast12(x, args...) ___bpf_ctx_cast11(args), (void *)ctx[11]
+#define ___bpf_ctx_cast13(x, args...) ___bpf_ctx_cast12(args), (void *)ctx[12]
+#define ___bpf_ctx_cast14(x, args...) ___bpf_ctx_cast13(args), (void *)ctx[13]
+#define ___bpf_ctx_cast15(x, args...) ___bpf_ctx_cast14(args), (void *)ctx[14]
 #define ___bpf_ctx_cast(args...)      ___bpf_apply(___bpf_ctx_cast, ___bpf_narg(args))(args)
 
 /*
-- 
2.40.1