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2e3ed68bfcd9c5ca2cf8b88ba23a34992ccd0b1f
linux/kernel/bpf
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Yonghong Song 2e3ed68bfc bpf: Add comments to interpret bpf_prog return values 
Add a short comment in bpf_iter_run_prog() function to
explain how bpf_prog return value is converted to
seq_ops->show() return value:
  bpf_prog return           seq_ops()->show() return
     0                         0
     1                         -EAGAIN

When show() return value is -EAGAIN, the current
bpf_seq_read() will end. If the current seq_file buffer
is empty, -EAGAIN will return to user space. Otherwise,
the buffer will be copied to user space.
In both cases, the next bpf_seq_read() call will
try to show the same object which returned -EAGAIN
previously.

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/20200513180218.2949517-1-yhs@fb.com
2020-05-13 12:30:50 -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: Add comments to interpret bpf_prog return values
2020-05-13 12:30:50 -07:00
bpf_lru_list.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206
2019-05-30 11:29:53 -07:00
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_types.h
bpf: tcp: Support tcp_congestion_ops in bpf
2020-01-09 08:46:18 -08:00
bpf_struct_ops.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
2020-03-25 18:58:11 -07:00
btf.c
bpf: Support variable length array in tracing programs
2020-05-09 17:05:27 -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
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 295
2019-06-05 17:36:38 +02:00
disasm.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 295
2019-06-05 17:36:38 +02:00
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: Create file bpf iterator
2020-05-09 17:05:26 -07:00
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: Add task and task/file iterator targets
2020-05-09 17:05:26 -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
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206
2019-05-30 11:29:53 -07:00
map_iter.c
bpf: Add bpf_map iterator
2020-05-09 17:05:26 -07:00
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
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206
2019-05-30 11:29:53 -07:00
queue_stack_maps.c
bpf, libbpf: Replace zero-length array with flexible-array
2020-05-11 16:56:47 +02:00
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: Add bpf_map 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
task_iter.c
bpf: Add task and task/file iterator targets
2020-05-09 17:05:26 -07:00
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: Handle spilled PTR_TO_BTF_ID properly when checking stack_boundary
2020-05-09 17:05:27 -07:00
xskmap.c
xsk: Make xskmap flush_list common for all map instances
2019-12-19 21:09:43 -08:00