[bpf-next,0/2] fix setting return values for htab batch ops and docs

Message

Anton Protopopov July 17, 2023, 11:43 a.m. UTC

This is a small follow up to the conversation with Hou in the following
thread:

  https://lore.kernel.org/bpf/[e-mail]/T/#u

Namely, the conversation was about that comments in <linux/bpf.h>
describing the return values from the batch operations are not 100%
obvious. I tried to make comments more clear. While doing this I also
found that this is better to patch how __htab_map_lookup_and_delete_batch
sets return values: the output parameter count could be set to non-zero in
case of error, which may confuse some userspace apps (as errno && non-zero
counter is considered a partially successful operation for batch ops).

Anton Protopopov (2):
  bpf: fix setting return values for htab batch ops
  bpf: update uapi/linux/bpf.h docs on the batch map ops

 include/uapi/linux/bpf.h | 22 ++++++++++++----------
 kernel/bpf/hashtab.c     | 14 +++++++-------
 2 files changed, 19 insertions(+), 17 deletions(-)