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-rw-r--r--lib/test_bpf.c57
1 files changed, 57 insertions, 0 deletions
diff --git a/lib/test_bpf.c b/lib/test_bpf.c
index c07b8e7db330..7f58c735d745 100644
--- a/lib/test_bpf.c
+++ b/lib/test_bpf.c
@@ -314,6 +314,47 @@ static int bpf_fill_maxinsns10(struct bpf_test *self)
return 0;
}
+static int __bpf_fill_ja(struct bpf_test *self, unsigned int len,
+ unsigned int plen)
+{
+ struct sock_filter *insn;
+ unsigned int rlen;
+ int i, j;
+
+ insn = kmalloc_array(len, sizeof(*insn), GFP_KERNEL);
+ if (!insn)
+ return -ENOMEM;
+
+ rlen = (len % plen) - 1;
+
+ for (i = 0; i + plen < len; i += plen)
+ for (j = 0; j < plen; j++)
+ insn[i + j] = __BPF_JUMP(BPF_JMP | BPF_JA,
+ plen - 1 - j, 0, 0);
+ for (j = 0; j < rlen; j++)
+ insn[i + j] = __BPF_JUMP(BPF_JMP | BPF_JA, rlen - 1 - j,
+ 0, 0);
+
+ insn[len - 1] = __BPF_STMT(BPF_RET | BPF_K, 0xababcbac);
+
+ self->u.ptr.insns = insn;
+ self->u.ptr.len = len;
+
+ return 0;
+}
+
+static int bpf_fill_maxinsns11(struct bpf_test *self)
+{
+ /* Hits 70 passes on x86_64, so cannot get JITed there. */
+ return __bpf_fill_ja(self, BPF_MAXINSNS, 68);
+}
+
+static int bpf_fill_ja(struct bpf_test *self)
+{
+ /* Hits exactly 11 passes on x86_64 JIT. */
+ return __bpf_fill_ja(self, 12, 9);
+}
+
static struct bpf_test tests[] = {
{
"TAX",
@@ -4252,6 +4293,14 @@ static struct bpf_test tests[] = {
{ },
{ { 0, 1 } },
},
+ {
+ "JMP_JA: Jump, gap, jump, ...",
+ { },
+ CLASSIC | FLAG_NO_DATA,
+ { },
+ { { 0, 0xababcbac } },
+ .fill_helper = bpf_fill_ja,
+ },
{ /* Mainly checking JIT here. */
"BPF_MAXINSNS: Maximum possible literals",
{ },
@@ -4335,6 +4384,14 @@ static struct bpf_test tests[] = {
{ { 0, 0xabababac } },
.fill_helper = bpf_fill_maxinsns10,
},
+ {
+ "BPF_MAXINSNS: Jump, gap, jump, ...",
+ { },
+ CLASSIC | FLAG_NO_DATA,
+ { },
+ { { 0, 0xababcbac } },
+ .fill_helper = bpf_fill_maxinsns11,
+ },
};
static struct net_device dev;