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DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1767366134; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=SWoEF/+O4yZ7+ZS1SC3d02+me9C0QQC50vg1G2pDlFk=; b=dTd7xJ82NQ50raWJ1auBfjVAEwvFe1zNPFyY3dHzp/bG923whF4XKdS/DUgHQEvXkI3H+D 2cu4C7PnzuE4zP0oxCJ+qzCDPlfxsgn1+i8mteiHNpH+MSZjsfbzjqr+Fwb8306pMkT6qV 7dilcsPQzEAPjUodluMNHjnbf0UKuoQ= From: Leon Hwang To: bpf@vger.kernel.org Cc: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Puranjay Mohan , Xu Kuohai , Catalin Marinas , Will Deacon , "David S . Miller" , David Ahern , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H . Peter Anvin" , Andrew Morton , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, kernel-patches-bot@fb.com, Leon Hwang Subject: [PATCH bpf-next 4/4] bpf, lib/test_bpf: Fix broken tailcall tests Date: Fri, 2 Jan 2026 23:00:32 +0800 Message-ID: <20260102150032.53106-5-leon.hwang@linux.dev> In-Reply-To: <20260102150032.53106-1-leon.hwang@linux.dev> References: <20260102150032.53106-1-leon.hwang@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260102_070217_321738_444D8E20 X-CRM114-Status: GOOD ( 19.65 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Update the tail call tests in test_bpf to work with the new tail call optimization that requires: 1. A valid used_maps array pointing to the prog array 2. Precomputed tail call targets in array->ptrs[max_entries + index] Signed-off-by: Leon Hwang --- lib/test_bpf.c | 39 ++++++++++++++++++++++++++++++++++----- 1 file changed, 34 insertions(+), 5 deletions(-) diff --git a/lib/test_bpf.c b/lib/test_bpf.c index af0041df2b72..680d34d46f19 100644 --- a/lib/test_bpf.c +++ b/lib/test_bpf.c @@ -15448,26 +15448,45 @@ static void __init destroy_tail_call_tests(struct bpf_array *progs) { int i; - for (i = 0; i < ARRAY_SIZE(tail_call_tests); i++) - if (progs->ptrs[i]) - bpf_prog_free(progs->ptrs[i]); + for (i = 0; i < ARRAY_SIZE(tail_call_tests); i++) { + struct bpf_prog *fp = progs->ptrs[i]; + + if (!fp) + continue; + + /* + * The used_maps points to fake maps that don't have + * proper ops, so clear it before bpf_prog_free to avoid + * bpf_free_used_maps trying to process it. + */ + kfree(fp->aux->used_maps); + fp->aux->used_maps = NULL; + fp->aux->used_map_cnt = 0; + bpf_prog_free(fp); + } kfree(progs); } static __init int prepare_tail_call_tests(struct bpf_array **pprogs) { + int prologue_offset = bpf_arch_tail_call_prologue_offset(); int ntests = ARRAY_SIZE(tail_call_tests); + u32 max_entries = ntests + 1; struct bpf_array *progs; int which, err; /* Allocate the table of programs to be used for tail calls */ - progs = kzalloc(struct_size(progs, ptrs, ntests + 1), GFP_KERNEL); + progs = kzalloc(struct_size(progs, ptrs, max_entries * 2), GFP_KERNEL); if (!progs) goto out_nomem; + /* Set max_entries before JIT, as it's used in JIT */ + progs->map.max_entries = max_entries; + /* Create all eBPF programs and populate the table */ for (which = 0; which < ntests; which++) { struct tail_call_test *test = &tail_call_tests[which]; + struct bpf_map *map = &progs->map; struct bpf_prog *fp; int len, i; @@ -15487,10 +15506,16 @@ static __init int prepare_tail_call_tests(struct bpf_array **pprogs) if (!fp) goto out_nomem; + fp->aux->used_maps = kmalloc_array(1, sizeof(map), GFP_KERNEL); + if (!fp->aux->used_maps) + goto out_nomem; + fp->len = len; fp->type = BPF_PROG_TYPE_SOCKET_FILTER; fp->aux->stack_depth = test->stack_depth; fp->aux->tail_call_reachable = test->has_tail_call; + fp->aux->used_maps[0] = map; + fp->aux->used_map_cnt = 1; memcpy(fp->insnsi, test->insns, len * sizeof(struct bpf_insn)); /* Relocate runtime tail call offsets and addresses */ @@ -15548,6 +15573,10 @@ static __init int prepare_tail_call_tests(struct bpf_array **pprogs) if ((long)__bpf_call_base + insn->imm != addr) *insn = BPF_JMP_A(0); /* Skip: NOP */ break; + + case BPF_JMP | BPF_TAIL_CALL: + insn->imm = 0; + break; } } @@ -15555,11 +15584,11 @@ static __init int prepare_tail_call_tests(struct bpf_array **pprogs) if (err) goto out_err; + progs->ptrs[max_entries + which] = (void *) fp->bpf_func + prologue_offset; progs->ptrs[which] = fp; } /* The last entry contains a NULL program pointer */ - progs->map.max_entries = ntests + 1; *pprogs = progs; return 0; -- 2.52.0