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    Subject[RFC PATCH v4 18/29] bpf tools: Introduce bpf_load_program() to bpf.c
    Date
    bpf_load_program() can be used to load bpf program into kernel. To make
    loading faster, first try to load without logbuf. Try again with logbuf
    if the first try failed.

    Signed-off-by: Wang Nan <wangnan0@huawei.com>
    ---
    tools/lib/bpf/bpf.c | 34 ++++++++++++++++++++++++++++++++++
    tools/lib/bpf/bpf.h | 7 +++++++
    2 files changed, 41 insertions(+)

    diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
    index 7481923..d2002da 100644
    --- a/tools/lib/bpf/bpf.c
    +++ b/tools/lib/bpf/bpf.c
    @@ -36,6 +36,11 @@
    # error __NR_bpf not defined. libbpf does not support your arch.
    #endif

    +static __u64 ptr_to_u64(void *ptr)
    +{
    + return (__u64) (unsigned long) ptr;
    +}
    +
    static int sys_bpf(enum bpf_cmd cmd, union bpf_attr *attr, unsigned int size)
    {
    return syscall(__NR_bpf, cmd, attr, size);
    @@ -54,3 +59,32 @@ int bpf_create_map(enum bpf_map_type map_type, int key_size, int value_size,

    return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));
    }
    +
    +int bpf_load_program(enum bpf_prog_type type, struct bpf_insn *insns,
    + size_t insns_cnt, char *license,
    + u32 kern_version, char *log_buf, size_t log_buf_sz)
    +{
    + int fd;
    + union bpf_attr attr;
    +
    + bzero(&attr, sizeof(attr));
    + attr.prog_type = type;
    + attr.insn_cnt = (__u32)insns_cnt;
    + attr.insns = ptr_to_u64(insns);
    + attr.license = ptr_to_u64(license);
    + attr.log_buf = ptr_to_u64(NULL);
    + attr.log_size = 0;
    + attr.log_level = 0;
    + attr.kern_version = kern_version;
    +
    + fd = sys_bpf(BPF_PROG_LOAD, &attr, sizeof(attr));
    + if (fd >= 0 || !log_buf || !log_buf_sz)
    + return fd;
    +
    + /* Try again with log */
    + attr.log_buf = ptr_to_u64(log_buf);
    + attr.log_size = log_buf_sz;
    + attr.log_level = 1;
    + log_buf[0] = 0;
    + return sys_bpf(BPF_PROG_LOAD, &attr, sizeof(attr));
    +}
    diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h
    index 28f7942..854b736 100644
    --- a/tools/lib/bpf/bpf.h
    +++ b/tools/lib/bpf/bpf.h
    @@ -13,4 +13,11 @@
    int bpf_create_map(enum bpf_map_type map_type, int key_size, int value_size,
    int max_entries);

    +/* Recommend log buffer size */
    +#define BPF_LOG_BUF_SIZE 65536
    +int bpf_load_program(enum bpf_prog_type type, struct bpf_insn *insns,
    + size_t insns_cnt, char *license,
    + u32 kern_version, char *log_buf,
    + size_t log_buf_sz);
    +
    #endif
    --
    1.8.3.4


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