test/bpf: add test-case for function return value

New test-case to cover situation when external function returns a
pointer the data.

Signed-off-by: Konstantin Ananyev <konstantin.ananyev@intel.com>

diff --git a/app/test/test_bpf.c b/app/test/test_bpf.c
index 1d50401..e884180 100644 (file)
--- a/app/test/test_bpf.c
+++ b/app/test/test_bpf.c
@@ -1777,6 +1777,118 @@ static const struct rte_bpf_xsym test_call2_xsym[] = {
        },
 };
 
+static const struct ebpf_insn test_call3_prog[] = {
+
+       {
+               .code = (BPF_JMP | EBPF_CALL),
+               .imm = 0,
+       },
+       {
+               .code = (BPF_LDX | BPF_MEM | BPF_B),
+               .dst_reg = EBPF_REG_2,
+               .src_reg = EBPF_REG_0,
+               .off = offsetof(struct dummy_offset, u8),
+       },
+       {
+               .code = (BPF_LDX | BPF_MEM | BPF_H),
+               .dst_reg = EBPF_REG_3,
+               .src_reg = EBPF_REG_0,
+               .off = offsetof(struct dummy_offset, u16),
+       },
+       {
+               .code = (BPF_LDX | BPF_MEM | BPF_W),
+               .dst_reg = EBPF_REG_4,
+               .src_reg = EBPF_REG_0,
+               .off = offsetof(struct dummy_offset, u32),
+       },
+       {
+               .code = (BPF_LDX | BPF_MEM | EBPF_DW),
+               .dst_reg = EBPF_REG_0,
+               .src_reg = EBPF_REG_0,
+               .off = offsetof(struct dummy_offset, u64),
+       },
+       /* return sum */
+       {
+               .code = (EBPF_ALU64 | BPF_ADD | BPF_X),
+               .dst_reg = EBPF_REG_0,
+               .src_reg = EBPF_REG_4,
+       },
+       {
+               .code = (EBPF_ALU64 | BPF_ADD | BPF_X),
+               .dst_reg = EBPF_REG_0,
+               .src_reg = EBPF_REG_3,
+       },
+       {
+               .code = (EBPF_ALU64 | BPF_ADD | BPF_X),
+               .dst_reg = EBPF_REG_0,
+               .src_reg = EBPF_REG_2,
+       },
+       {
+               .code = (BPF_JMP | EBPF_EXIT),
+       },
+};
+
+static const struct dummy_offset *
+dummy_func3(const struct dummy_vect8 *p)
+{
+       return &p->in[RTE_DIM(p->in) - 1];
+}
+
+static void
+test_call3_prepare(void *arg)
+{
+       struct dummy_vect8 *pv;
+       struct dummy_offset *df;
+
+       pv = arg;
+       df = (struct dummy_offset *)(uintptr_t)dummy_func3(pv);
+
+       memset(pv, 0, sizeof(*pv));
+       df->u64 = (int32_t)TEST_FILL_1;
+       df->u32 = df->u64;
+       df->u16 = df->u64;
+       df->u8 = df->u64;
+}
+
+static int
+test_call3_check(uint64_t rc, const void *arg)
+{
+       uint64_t v;
+       const struct dummy_vect8 *pv;
+       const struct dummy_offset *dft;
+
+       pv = arg;
+       dft = dummy_func3(pv);
+
+       v = dft->u64;
+       v += dft->u32;
+       v += dft->u16;
+       v += dft->u8;
+
+       return cmp_res(__func__, v, rc, pv, pv, sizeof(*pv));
+}
+
+static const struct rte_bpf_xsym test_call3_xsym[] = {
+       {
+               .name = RTE_STR(dummy_func3),
+               .type = RTE_BPF_XTYPE_FUNC,
+               .func = {
+                       .val = (void *)dummy_func3,
+                       .nb_args = 1,
+                       .args = {
+                               [0] = {
+                                       .type = RTE_BPF_ARG_PTR,
+                                       .size = sizeof(struct dummy_vect8),
+                               },
+                       },
+                       .ret = {
+                               .type = RTE_BPF_ARG_PTR,
+                               .size = sizeof(struct dummy_offset),
+                       },
+               },
+       },
+};
+
 static const struct bpf_test tests[] = {
        {
                .name = "test_store1",
@@ -1968,6 +2080,24 @@ static const struct bpf_test tests[] = {
                /* for now don't support function calls on 32 bit platform */
                .allow_fail = (sizeof(uint64_t) != sizeof(uintptr_t)),
        },
+       {
+               .name = "test_call3",
+               .arg_sz = sizeof(struct dummy_vect8),
+               .prm = {
+                       .ins = test_call3_prog,
+                       .nb_ins = RTE_DIM(test_call3_prog),
+                       .prog_arg = {
+                               .type = RTE_BPF_ARG_PTR,
+                               .size = sizeof(struct dummy_vect8),
+                       },
+                       .xsym = test_call3_xsym,
+                       .nb_xsym = RTE_DIM(test_call3_xsym),
+               },
+               .prepare = test_call3_prepare,
+               .check_result = test_call3_check,
+               /* for now don't support function calls on 32 bit platform */
+               .allow_fail = (sizeof(uint64_t) != sizeof(uintptr_t)),
+       },
 };
 
 static int