-----Original Message-----
> Kernel commit 80ee81e0403c ("bpf: Eliminate rlimit-based memory
> accounting infra for bpf maps") removed the struct bpf_map_memory
> member from struct bpf_map. Without the patch, the "bpf -m|-M" options
> will print "(unknown)" for MEMLOCK and UID:
>
> crash> bpf -m 1
> ID BPF_MAP BPF_MAP_TYPE MAP_FLAGS
> 1 ffff96ba41804400 ARRAY 00000000
> KEY_SIZE: 4 VALUE_SIZE: 8 MAX_ENTRIES: 64 MEMLOCK: (unknown)
> NAME: "dist" UID: (unknown)
>
> Signed-off-by: Lianbo Jiang <[email protected]>
> Signed-off-by: Kazuhito Hagio <[email protected]>
Thank you for the v2, applied.
Kazu
> ---
> bpf.c | 70 +++++++++++++++++++++++++++++++++++++++++++++++++++++++----
> 1 file changed, 66 insertions(+), 4 deletions(-)
>
> diff --git a/bpf.c b/bpf.c
> index cb6b0ed385f9..466b244e0c3a 100644
> --- a/bpf.c
> +++ b/bpf.c
> @@ -63,6 +63,64 @@ static int do_old_idr(int, ulong, struct list_pair *);
> #define PROG_VERBOSE (0x40)
> #define MAP_VERBOSE (0x80)
>
> +static int map_is_per_cpu(int type)
> +{
> +
> +/* See the definition of bpf_map_type: include/uapi/linux/bpf.h */
> +#define BPF_MAP_TYPE_PERCPU_HASH (5UL)
> +#define BPF_MAP_TYPE_PERCPU_ARRAY (6UL)
> +#define BPF_MAP_TYPE_LRU_PERCPU_HASH (10UL)
> +#define BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE (21UL)
> +
> + return type == BPF_MAP_TYPE_PERCPU_HASH ||
> + type == BPF_MAP_TYPE_PERCPU_ARRAY ||
> + type == BPF_MAP_TYPE_LRU_PERCPU_HASH ||
> + type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE;
> +}
> +
> +static int map_is_fd_map(int type)
> +{
> +
> +/* See the definition of bpf_map_type: include/uapi/linux/bpf.h */
> +#define BPF_MAP_TYPE_PROG_ARRAY (3UL)
> +#define BPF_MAP_TYPE_PERF_EVENT_ARRAY (4UL)
> +#define BPF_MAP_TYPE_CGROUP_ARRAY (8UL)
> +#define BPF_MAP_TYPE_ARRAY_OF_MAPS (12UL)
> +#define BPF_MAP_TYPE_HASH_OF_MAPS (13UL)
> +
> + return type == BPF_MAP_TYPE_PROG_ARRAY ||
> + type == BPF_MAP_TYPE_PERF_EVENT_ARRAY ||
> + type == BPF_MAP_TYPE_CGROUP_ARRAY ||
> + type == BPF_MAP_TYPE_ARRAY_OF_MAPS ||
> + type == BPF_MAP_TYPE_HASH_OF_MAPS;
> +
> +}
> +
> +static ulong bpf_map_memory_size(int map_type, uint value_size,
> + uint key_size, uint max_entries)
> +{
> + ulong size;
> + uint valsize;
> + int cpus = 0;
> +
> + if (map_is_per_cpu(map_type)) {
> + cpus = get_cpus_possible();
> + if (!cpus) {
> + error(WARNING, "cpu_possible_map does not exist,
> possible cpus: %d\n", cpus);
> + return 0;
> + }
> +
> + valsize = roundup(value_size, 8) * cpus;
> + } else if (map_is_fd_map(map_type))
> + valsize = sizeof(uint);
> + else
> + valsize = value_size;
> +
> + size = roundup((key_size + valsize), 8);
> +
> + return roundup((max_entries * size), PAGESIZE());
> +}
> +
> void
> cmd_bpf(void)
> {
> @@ -332,7 +390,7 @@ do_bpf(ulong flags, ulong prog_id, ulong map_id, int
> radix)
> {
> struct bpf_info *bpf;
> int i, c, found, entries, type;
> - uint uid, map_pages, key_size, value_size, max_entries;
> + uint uid, map_pages, key_size = 0, value_size = 0, max_entries = 0;
> ulong bpf_prog_aux, bpf_func, end_func, addr, insnsi, user;
> ulong do_progs, do_maps;
> ulonglong load_time;
> @@ -572,6 +630,8 @@ do_map_only:
> fprintf(fp, "\n");
>
> if (flags & (MAP_ID|MAP_VERBOSE)) {
> + ulong msize = 0;
> +
> fprintf(fp, " KEY_SIZE: ");
> if (VALID_MEMBER(bpf_map_key_size)) {
> key_size = UINT(bpf->bpf_map_buf +
> OFFSET(bpf_map_key_size));
> @@ -602,8 +662,10 @@ do_map_only:
> } else if (VALID_MEMBER(bpf_map_pages)) {
> map_pages = UINT(bpf->bpf_map_buf +
> OFFSET(bpf_map_pages));
> fprintf(fp, "%d\n", map_pages * PAGESIZE());
> - } else
> - fprintf(fp, "(unknown)\n");
> + } else if ((msize = bpf_map_memory_size(type,
> value_size, key_size, max_entries)))
> + fprintf(fp, "%ld\n", msize);
> + else
> + fprintf(fp, "(unknown)");
>
> fprintf(fp, " NAME: ");
> if (VALID_MEMBER(bpf_map_name)) {
> @@ -632,7 +694,7 @@ do_map_only:
> else
> fprintf(fp, "(unknown)\n");
> } else
> - fprintf(fp, "(unknown)\n");
> + fprintf(fp, "(unused)\n");
> }
>
> if (flags & DUMP_STRUCT) {
> --
> 2.30.2
--
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