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| author | Eric Dumazet <edumazet@google.com> | 2023-02-06 17:31:00 +0000 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2023-02-07 10:59:48 -0800 |
| commit | 115f1a5c42bdad9a9ea356fc0b4a39ec7537947f (patch) | |
| tree | 3940b5e63f565d6c5430d370a427d7f82031cd68 /include/linux/skbuff.h | |
| parent | 61d731e6538dc44abf2dca6e77098ec6e85f7cc2 (diff) | |
| download | lwn-115f1a5c42bdad9a9ea356fc0b4a39ec7537947f.tar.gz lwn-115f1a5c42bdad9a9ea356fc0b4a39ec7537947f.zip | |
net: add SKB_HEAD_ALIGN() helper
We have many places using this expression:
SKB_DATA_ALIGN(sizeof(struct skb_shared_info))
Use of SKB_HEAD_ALIGN() will allow to clean them.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Acked-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Alexander Duyck <alexanderduyck@fb.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'include/linux/skbuff.h')
| -rw-r--r-- | include/linux/skbuff.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index 1fa95b916342..c3df3b55da97 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -255,6 +255,14 @@ #define SKB_DATA_ALIGN(X) ALIGN(X, SMP_CACHE_BYTES) #define SKB_WITH_OVERHEAD(X) \ ((X) - SKB_DATA_ALIGN(sizeof(struct skb_shared_info))) + +/* For X bytes available in skb->head, what is the minimal + * allocation needed, knowing struct skb_shared_info needs + * to be aligned. + */ +#define SKB_HEAD_ALIGN(X) (SKB_DATA_ALIGN(X) + \ + SKB_DATA_ALIGN(sizeof(struct skb_shared_info))) + #define SKB_MAX_ORDER(X, ORDER) \ SKB_WITH_OVERHEAD((PAGE_SIZE << (ORDER)) - (X)) #define SKB_MAX_HEAD(X) (SKB_MAX_ORDER((X), 0)) |