Create an ELF file to load using clang. Repackage the object into an array using xdd. Write a test to see load and run the BPF.
If libelf library is not available, then DPDK bpf will return -ENOTSUP to the test and the test will be skipped. Signed-off-by: Stephen Hemminger <[email protected]> Acked-by: Marat Khalili <[email protected]> --- app/test/bpf/load.c | 51 +++++++++++++ app/test/bpf/meson.build | 52 +++++++++++++ app/test/meson.build | 2 + app/test/test_bpf.c | 159 +++++++++++++++++++++++++++++++++++++++ 4 files changed, 264 insertions(+) create mode 100644 app/test/bpf/load.c create mode 100644 app/test/bpf/meson.build diff --git a/app/test/bpf/load.c b/app/test/bpf/load.c new file mode 100644 index 0000000000..a4d3d61d7a --- /dev/null +++ b/app/test/bpf/load.c @@ -0,0 +1,51 @@ +/* SPDX-License-Identifier: BSD-3-Clause + * + * BPF program for testing rte_bpf_elf_load + */ + +typedef unsigned char uint8_t; +typedef unsigned short uint16_t; +typedef unsigned int uint32_t; +typedef unsigned long uint64_t; + +/* Match the structures from test_bpf.c */ +struct dummy_offset { + uint64_t u64; + uint32_t u32; + uint16_t u16; + uint8_t u8; +} __attribute__((packed)); + +struct dummy_vect8 { + struct dummy_offset in[8]; + struct dummy_offset out[8]; +}; + +/* External function declaration - provided by test via xsym */ +extern void dummy_func1(const void *p, uint32_t *v32, uint64_t *v64); + +/* + * Test BPF function that will be loaded from ELF + * This function is compiled version of code used in test_call1 + */ +__attribute__((section("call1"), used)) +uint64_t +test_call1(struct dummy_vect8 *arg) +{ + uint32_t v32; + uint64_t v64; + + /* Load input values */ + v32 = arg->in[0].u32; + v64 = arg->in[0].u64; + + /* Call external function */ + dummy_func1(arg, &v32, &v64); + + /* Store results */ + arg->out[0].u32 = v32; + arg->out[0].u64 = v64; + + v64 += v32; + return v64; +} diff --git a/app/test/bpf/meson.build b/app/test/bpf/meson.build new file mode 100644 index 0000000000..b4f54aa976 --- /dev/null +++ b/app/test/bpf/meson.build @@ -0,0 +1,52 @@ +# SPDX-License-Identifier: BSD-3-Clause +# Copyright 2025 Stephen Hemminger <[email protected]> + +bpf_test_hdrs = [ ] + +# use clang to compile to bpf +clang_supports_bpf = false +clang = find_program('clang', required: false) +if clang.found() + clang_supports_bpf = run_command(clang, '-target', 'bpf', '--print-supported-cpus', + check: false).returncode() == 0 +endif + +if not clang_supports_bpf + message('app/test_bpf: no BPF load tests missing clang BPF support') + subdir_done() + +endif + +xxd = find_program('xxd', required: false) +if not xxd.found() + message('app/test_bpf: missing xxd required to convert object to array') + subdir_done() +endif + +# BPF compiler flags +bpf_cflags = [ '-O2', '-target', 'bpf', '-g', '-c'] + +# Enable test in test_bpf.c +cflags += '-DTEST_BPF_ELF_LOAD' + +# BPF sources to compile +bpf_progs = { + 'load' : 'test_bpf_load', +} + +foreach bpf_src, bpf_hdr : bpf_progs + # Compile BPF C source to object file + bpf_obj = custom_target(bpf_src + '_o', + input: bpf_src + '.c', + output: bpf_src + '.o', + command: [ clang, bpf_cflags, '@INPUT@', '-o', '@OUTPUT@']) + + # Convert object file to C header using xxd + bpf_test_h = custom_target(bpf_src + '_h', + input: bpf_obj, + output: bpf_hdr + '.h', + command: [ xxd, '-i', '@INPUT@', '@OUTPUT@']) + + resources += bpf_test_h + +endforeach diff --git a/app/test/meson.build b/app/test/meson.build index 8df8d3edd1..efec42a6bf 100644 --- a/app/test/meson.build +++ b/app/test/meson.build @@ -281,6 +281,8 @@ if not is_windows install: false) endif +subdir('bpf') + subdir('test_cfgfiles') resources += test_cfgfile_h diff --git a/app/test/test_bpf.c b/app/test/test_bpf.c index 90e10d7d2c..c460002358 100644 --- a/app/test/test_bpf.c +++ b/app/test/test_bpf.c @@ -6,6 +6,7 @@ #include <string.h> #include <stdint.h> #include <inttypes.h> +#include <unistd.h> #include <rte_memory.h> #include <rte_debug.h> @@ -14,6 +15,7 @@ #include <rte_random.h> #include <rte_byteorder.h> #include <rte_errno.h> + #include "test.h" #if !defined(RTE_LIB_BPF) @@ -3278,6 +3280,163 @@ test_bpf(void) REGISTER_FAST_TEST(bpf_autotest, true, true, test_bpf); +#ifdef TEST_BPF_ELF_LOAD + +/* + * Helper function to write BPF object data to temporary file. + * Returns temp file path on success, NULL on failure. + * Caller must free the returned path and unlink the file. + */ +static char * +create_temp_bpf_file(const uint8_t *data, size_t size, const char *name) +{ + char *tmpfile = NULL; + int fd; + ssize_t written; + + if (asprintf(&tmpfile, "/tmp/dpdk_bpf_%s_XXXXXX.o", name) < 0) { + printf("%s@%d: asprintf failed: %s\n", + __func__, __LINE__, strerror(errno)); + return NULL; + } + + /* Create and open temp file */ + fd = mkstemps(tmpfile, strlen(".o")); + if (fd < 0) { + printf("%s@%d: mkstemps(%s) failed: %s\n", + __func__, __LINE__, tmpfile, strerror(errno)); + free(tmpfile); + return NULL; + } + + /* Write BPF object data */ + written = write(fd, data, size); + close(fd); + + if (written != (ssize_t)size) { + printf("%s@%d: write failed: %s\n", + __func__, __LINE__, strerror(errno)); + unlink(tmpfile); + free(tmpfile); + return NULL; + } + + return tmpfile; +} + +#include "test_bpf_load.h" + +/* + * Test loading BPF program from an object file. + * This test uses same arguments as previous test_call1 example. + */ +static int +test_bpf_elf_load(void) +{ + static const char test_section[] = "call1"; + uint8_t tbuf[sizeof(struct dummy_vect8)]; + const struct rte_bpf_xsym xsym[] = { + { + .name = RTE_STR(dummy_func1), + .type = RTE_BPF_XTYPE_FUNC, + .func = { + .val = (void *)dummy_func1, + .nb_args = 3, + .args = { + [0] = { + .type = RTE_BPF_ARG_PTR, + .size = sizeof(struct dummy_offset), + }, + [1] = { + .type = RTE_BPF_ARG_PTR, + .size = sizeof(uint32_t), + }, + [2] = { + .type = RTE_BPF_ARG_PTR, + .size = sizeof(uint64_t), + }, + }, + }, + }, + }; + int ret; + + /* Create temp file from embedded BPF object */ + char *tmpfile = create_temp_bpf_file(app_test_bpf_load_o, + app_test_bpf_load_o_len, + "load"); + if (tmpfile == NULL) + return -1; + + /* Try to load BPF program from temp file */ + const struct rte_bpf_prm prm = { + .xsym = xsym, + .nb_xsym = RTE_DIM(xsym), + .prog_arg = { + .type = RTE_BPF_ARG_PTR, + .size = sizeof(tbuf), + }, + }; + + struct rte_bpf *bpf = rte_bpf_elf_load(&prm, tmpfile, test_section); + unlink(tmpfile); + free(tmpfile); + + /* If libelf support is not available */ + if (bpf == NULL && rte_errno == ENOTSUP) + return TEST_SKIPPED; + + TEST_ASSERT(bpf != NULL, "failed to load BPF %d:%s", rte_errno, strerror(rte_errno)); + + /* Prepare test data */ + struct dummy_vect8 *dv = (struct dummy_vect8 *)tbuf; + + memset(dv, 0, sizeof(*dv)); + dv->in[0].u64 = (int32_t)TEST_FILL_1; + dv->in[0].u32 = dv->in[0].u64; + dv->in[0].u16 = dv->in[0].u64; + dv->in[0].u8 = dv->in[0].u64; + + /* Execute loaded BPF program */ + uint64_t rc = rte_bpf_exec(bpf, tbuf); + ret = test_call1_check(rc, tbuf); + TEST_ASSERT(ret == 0, "test_call1_check failed: %d", ret); + + /* Test JIT if available */ + struct rte_bpf_jit jit; + ret = rte_bpf_get_jit(bpf, &jit); + TEST_ASSERT(ret == 0, "rte_bpf_get_jit failed: %d", ret); + + if (jit.func != NULL) { + memset(dv, 0, sizeof(*dv)); + dv->in[0].u64 = (int32_t)TEST_FILL_1; + dv->in[0].u32 = dv->in[0].u64; + dv->in[0].u16 = dv->in[0].u64; + dv->in[0].u8 = dv->in[0].u64; + + rc = jit.func(tbuf); + ret = test_call1_check(rc, tbuf); + TEST_ASSERT(ret == 0, "jit test_call1_check failed: %d", ret); + } + + rte_bpf_destroy(bpf); + + printf("%s: ELF load test passed\n", __func__); + return TEST_SUCCESS; +} +#else + +static int +test_bpf_elf_load(void) +{ + printf("BPF compile not supported, skipping test\n"); + return TEST_SKIPPED; +} + +#endif /* !TEST_BPF_ELF_LOAD */ + +REGISTER_FAST_TEST(bpf_elf_load_autotest, true, true, test_bpf_elf_load); + #ifndef RTE_HAS_LIBPCAP static int -- 2.51.0
