netdev - [RFC PATCH bpf-next v2 04/16] MIPS: eBPF: support BPF

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Message-Id: <8ca5dfaa9ad749e643f9246d2434c12a1c21150a.1633392335.git.Tony.Ambardar@gmail.com>
Date:   Tue,  5 Oct 2021 01:26:48 -0700
From:   Tony Ambardar <tony.ambardar@...il.com>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Paul Burton <paulburton@...nel.org>
Cc:     Tony Ambardar <Tony.Ambardar@...il.com>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-mips@...r.kernel.org,
        Johan Almbladh <johan.almbladh@...finetworks.com>,
        Tiezhu Yang <yangtiezhu@...ngson.cn>,
        Hassan Naveed <hnaveed@...ecomp.com>,
        David Daney <ddaney@...iumnetworks.com>,
        Luke Nelson <luke.r.nels@...il.com>,
        Serge Semin <fancer.lancer@...il.com>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>
Subject: [RFC PATCH bpf-next v2 04/16] MIPS: eBPF: support BPF_JMP32 in JIT static analysis

While the MIPS64 JIT rejects programs with JMP32 insns, it still performs
initial static analysis. Add support in reg_val_propagate_range() for
BPF_JMP32, fixing kernel log WARNINGs ("Unhandled BPF_JMP case") seen
during JIT testing. Handle code BPF_JMP32 the same as BPF_JMP.

Fixes: 092ed0968bb6 ("bpf: verifier support JMP32")
Signed-off-by: Tony Ambardar <Tony.Ambardar@...il.com>
---
 arch/mips/net/ebpf_jit.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/mips/net/ebpf_jit.c b/arch/mips/net/ebpf_jit.c
index b41ebcfb90c4..dbde5d6eefa6 100644
--- a/arch/mips/net/ebpf_jit.c
+++ b/arch/mips/net/ebpf_jit.c
@@ -1686,6 +1686,7 @@ static int reg_val_propagate_range(struct jit_ctx *ctx, u64 initial_rvt,
 			rvt[idx] |= RVT_DONE;
 			break;
 		case BPF_JMP:
+		case BPF_JMP32:
 			switch (BPF_OP(insn->code)) {
 			case BPF_EXIT:
 				rvt[idx] = RVT_DONE | exit_rvt;
-- 
2.25.1