linux-stable/kernel/bpf
Yonghong Song ac51d99bf8 bpf: Create anonymous bpf iterator
A new bpf command BPF_ITER_CREATE is added.

The anonymous bpf iterator is seq_file based.
The seq_file private data are referenced by targets.
The bpf_iter infrastructure allocated additional space
at seq_file->private before the space used by targets
to store some meta data, e.g.,
  prog:       prog to run
  session_id: an unique id for each opened seq_file
  seq_num:    how many times bpf programs are queried in this session
  done_stop:  an internal state to decide whether bpf program
              should be called in seq_ops->stop() or not

The seq_num will start from 0 for valid objects.
The bpf program may see the same seq_num more than once if
 - seq_file buffer overflow happens and the same object
   is retried by bpf_seq_read(), or
 - the bpf program explicitly requests a retry of the
   same object

Since module is not supported for bpf_iter, all target
registeration happens at __init time, so there is no
need to change bpf_iter_unreg_target() as it is used
mostly in error path of the init function at which time
no bpf iterators have been created yet.

Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20200509175905.2475770-1-yhs@fb.com
2020-05-09 17:05:26 -07:00
..
arraymap.c bpf: Add lookup and update batch ops to arraymap 2020-01-15 14:00:35 -08:00
bpf_iter.c bpf: Create anonymous bpf iterator 2020-05-09 17:05:26 -07:00
bpf_lru_list.c
bpf_lru_list.h bpf: Fix a typo "inacitve" -> "inactive" 2020-04-06 21:54:10 +02:00
bpf_lsm.c bpf: lsm: Implement attach, detach and execution 2020-03-30 01:34:00 +02:00
bpf_struct_ops.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-03-25 18:58:11 -07:00
bpf_struct_ops_types.h bpf: tcp: Support tcp_congestion_ops in bpf 2020-01-09 08:46:18 -08:00
btf.c bpf: Add support for BPF_OBJ_GET_INFO_BY_FD for bpf_link 2020-04-28 17:27:08 -07:00
cgroup.c bpf: Add support for BPF_OBJ_GET_INFO_BY_FD for bpf_link 2020-04-28 17:27:08 -07:00
core.c bpf: add bpf_ktime_get_boot_ns() 2020-04-26 09:43:05 -07:00
cpumap.c cpumap: Avoid warning when CONFIG_DEBUG_PER_CPU_MAPS is enabled 2020-04-20 18:38:04 -07:00
devmap.c xdp: export the DEV_MAP_BULK_SIZE macro 2020-04-22 20:11:29 -07:00
disasm.c
disasm.h
dispatcher.c bpf: Remove bpf_image tree 2020-03-13 12:49:52 -07:00
hashtab.c bpf: Replace zero-length array with flexible-array member 2020-02-28 01:21:02 +01:00
helpers.c bpf: add bpf_ktime_get_boot_ns() 2020-04-26 09:43:05 -07:00
inode.c bpf: Introduce pinnable bpf_link abstraction 2020-03-02 22:06:27 -08:00
local_storage.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-12-22 09:54:33 -08:00
lpm_trie.c bpf: Replace zero-length array with flexible-array member 2020-02-28 01:21:02 +01:00
Makefile bpf: Implement an interface to register bpf_iter targets 2020-05-09 17:05:25 -07:00
map_in_map.c bpf: Introduce BPF_MAP_TYPE_STRUCT_OPS 2020-01-09 08:46:18 -08:00
map_in_map.h
offload.c bpf, offload: Replace bitwise AND by logical AND in bpf_prog_offload_info_fill 2020-02-17 16:53:49 +01:00
percpu_freelist.c bpf: Dont iterate over possible CPUs with interrupts disabled 2020-02-24 16:18:20 -08:00
percpu_freelist.h
queue_stack_maps.c
reuseport_array.c net: Generate reuseport group ID on group creation 2020-02-21 22:29:45 +01:00
stackmap.c bpf/stackmap: Dont trylock mmap_sem with PREEMPT_RT and interrupts disabled 2020-02-24 16:20:10 -08:00
syscall.c bpf: Create anonymous bpf iterator 2020-05-09 17:05:26 -07:00
sysfs_btf.c bpf: Support llvm-objcopy for vmlinux BTF 2020-03-19 12:32:38 +01:00
tnum.c bpf: Verifier, do explicit ALU32 bounds tracking 2020-03-30 14:59:53 -07:00
trampoline.c bpf: lsm: Implement attach, detach and execution 2020-03-30 01:34:00 +02:00
verifier.c bpf: Allow loading of a bpf_iter program 2020-05-09 17:05:26 -07:00
xskmap.c