diff mbox series

[bpf-next,3/4] riscv, bpf: Add RV_TAILCALL_OFFSET macro to format tailcall offset

Message ID 20230919035711.3297256-4-pulehui@huaweicloud.com (mailing list archive)
State Changes Requested
Delegated to: BPF
Headers show
Series Mixing bpf2bpf and tailcalls for RV64 | expand

Checks

Context Check Description
bpf/vmtest-bpf-next-PR success PR summary
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for bpf-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 9 this patch: 9
netdev/cc_maintainers warning 3 maintainers not CCed: aou@eecs.berkeley.edu paul.walmsley@sifive.com yonghong.song@linux.dev
netdev/build_clang success Errors and warnings before: 9 this patch: 9
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 9 this patch: 9
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 27 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
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Commit Message

Pu Lehui Sept. 19, 2023, 3:57 a.m. UTC 
From: Pu Lehui <pulehui@huawei.com>

Add RV_TAILCALL_OFFSET macro to format tailcall offset, and correct the
relevant comments.

Signed-off-by: Pu Lehui <pulehui@huawei.com>
---
 arch/riscv/net/bpf_jit_comp64.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/arch/riscv/net/bpf_jit_comp64.c b/arch/riscv/net/bpf_jit_comp64.c
index 57535cfe1..f2ded1151 100644
--- a/arch/riscv/net/bpf_jit_comp64.c
+++ b/arch/riscv/net/bpf_jit_comp64.c
@@ -13,7 +13,9 @@ 
 #include <asm/patch.h>
 #include "bpf_jit.h"
 
-#define RV_FENTRY_NINSNS 2
+#define RV_FENTRY_NINSNS	2
+/* fentry and TCC init insns will be skipped on tailcall */
+#define RV_TAILCALL_OFFSET	((RV_FENTRY_NINSNS + 1) * 4)
 
 #define RV_REG_TCC RV_REG_A6
 #define RV_REG_TCC_SAVED RV_REG_S6 /* Store A6 in S6 if program do calls */
@@ -243,8 +245,7 @@  static void __build_epilogue(bool is_tail_call, struct rv_jit_context *ctx)
 	if (!is_tail_call)
 		emit_mv(RV_REG_A0, RV_REG_A5, ctx);
 	emit_jalr(RV_REG_ZERO, is_tail_call ? RV_REG_T3 : RV_REG_RA,
-		  is_tail_call ? (RV_FENTRY_NINSNS + 1) * 4 : 0, /* skip reserved nops and TCC init */
-		  ctx);
+		  is_tail_call ? RV_TAILCALL_OFFSET : 0, ctx);
 }
 
 static void emit_bcc(u8 cond, u8 rd, u8 rs, int rvoff,
@@ -371,7 +372,7 @@  static int emit_bpf_tail_call(int insn, struct rv_jit_context *ctx)
 	off = ninsns_rvoff(tc_ninsn - (ctx->ninsns - start_insn));
 	emit_branch(BPF_JEQ, RV_REG_T2, RV_REG_ZERO, off, ctx);
 
-	/* goto *(prog->bpf_func + 4); */
+	/* goto *(prog->bpf_func + RV_TAILCALL_OFFSET); */
 	off = offsetof(struct bpf_prog, bpf_func);
 	if (is_12b_check(off, insn))
 		return -1;