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bpf_helpers: change how default map flags are calculated

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This is more legible then a series of if's,
although thus require manually adding support for new map types.

Test: TreeHugger
Flag: EXEMPT mainline
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I8900eb8ced5e4a1cb161b49e5c68d2effe36af57
This commit is contained in:
Maciej Żenczykowski 2025-08-07 14:37:56 -07:00
commit eb485ae1e9
1 changed files with 10 additions and 6 deletions
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16
bpf/progs/include/bpf_helpers.h
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@ -236,12 +236,16 @@ static long (*bpf_sk_storage_delete_unsafe) (const void* sk_storage,
#define ABSOLUTE(x) ((x) < 0 ? -(x) : (x))
#define DEFAULT_BPF_MAP_FLAGS(TYPE, num_entries, mapflags) \
( (mapflags) | \
((num_entries) < 0 ? BPF_F_NO_PREALLOC : 0) | \
( (BPF_MAP_TYPE_##TYPE == BPF_MAP_TYPE_LPM_TRIE || \
BPF_MAP_TYPE_##TYPE == BPF_MAP_TYPE_SK_STORAGE) ? BPF_F_NO_PREALLOC : 0) \
)
#define DEFAULT_FLAGS_FOR_BPF_MAP_TYPE_ARRAY 0
#define DEFAULT_FLAGS_FOR_BPF_MAP_TYPE_DEVMAP_HASH 0
#define DEFAULT_FLAGS_FOR_BPF_MAP_TYPE_HASH 0
#define DEFAULT_FLAGS_FOR_BPF_MAP_TYPE_LPM_TRIE BPF_F_NO_PREALLOC
#define DEFAULT_FLAGS_FOR_BPF_MAP_TYPE_PERCPU_ARRAY 0
#define DEFAULT_FLAGS_FOR_BPF_MAP_TYPE_RINGBUF 0
#define DEFAULT_FLAGS_FOR_BPF_MAP_TYPE_SK_STORAGE BPF_F_NO_PREALLOC
#define DEFAULT_BPF_MAP_FLAGS(TYPE, num_entries, mapflags) \
(DEFAULT_FLAGS_FOR_BPF_MAP_TYPE_##TYPE | ((num_entries) < 0 ? BPF_F_NO_PREALLOC : 0) | (mapflags))
#define DEFINE_BPF_MAP_BASE(the_map, TYPE, keysize, valuesize, num_entries, usr, grp, md, \
selinux, pindir, minkver, maxkver, minloader, maxloader, mapflags) \