Thread (15 messages) 15 messages, 2 authors, 2020-07-27

Re: [PATCH bpf-next v6 1/7] bpf: Renames to prepare for generalizing sk_storage.

From: Martin KaFai Lau <hidden>
Date: 2020-07-24 05:32:03
Also in: bpf, lkml

On Thu, Jul 23, 2020 at 01:50:26PM +0200, KP Singh wrote:
From: KP Singh <redacted>

A purely mechanical change to split the renaming from the actual
generalization.

Flags/consts:

  SK_STORAGE_CREATE_FLAG_MASK	BPF_LOCAL_STORAGE_CREATE_FLAG_MASK
  BPF_SK_STORAGE_CACHE_SIZE	BPF_LOCAL_STORAGE_CACHE_SIZE
  MAX_VALUE_SIZE		BPF_LOCAL_STORAGE_MAX_VALUE_SIZE

Structs:

  bucket			bpf_local_storage_map_bucket
  bpf_sk_storage_map		bpf_local_storage_map
  bpf_sk_storage_data		bpf_local_storage_data
  bpf_sk_storage_elem		bpf_local_storage_elem
  bpf_sk_storage		bpf_local_storage
  selem_linked_to_sk		selem_linked_to_storage
  selem_alloc			bpf_selem_alloc

The "sk" member in bpf_local_storage is also updated to "owner"
in preparation for changing the type to void * in a subsequent patch.

Functions:

  __selem_unlink_sk			bpf_selem_unlink_storage
  __selem_link_sk			bpf_selem_link_storage
  selem_unlink_sk			__bpf_selem_unlink_storage
  sk_storage_update			bpf_local_storage_update
  __sk_storage_lookup			bpf_local_storage_lookup
  bpf_sk_storage_map_free		bpf_local_storage_map_free
  bpf_sk_storage_map_alloc		bpf_local_storage_map_alloc
  bpf_sk_storage_map_alloc_check	bpf_local_storage_map_alloc_check
  bpf_sk_storage_map_check_btf		bpf_local_storage_map_check_btf
Thanks for separating this mechanical name change in a separate patch.
It is much easier to follow.  This patch looks good.

A minor thought is, when I look at unlink_map() and unlink_storage(),
it keeps me looking back for the lock situation.  I think
the main reason is the bpf_selem_unlink_map() is locked but
bpf_selem_unlink_storage() is unlocked now.  May be:

bpf_selem_unlink_map()		=> bpf_selem_unlink_map_locked()
bpf_selem_link_map()		=> bpf_selem_link_map_locked()
__bpf_selem_unlink_storage() 	=> bpf_selem_unlink_storage_locked()
bpf_link_storage() means unlocked
bpf_unlink_storage() means unlocked.

I think it could be one follow-up patch later instead of interrupting
multiple patches in this set for this minor thing.  For now, lets
continue with this and remember default is nolock for storage.

I will continue tomorrow.
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