mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-29 14:05:19 +08:00
9facd94114
Long time ago Tom added a giant comment to skbuff.h explaining checksums. Now that we have a place in Documentation for skbuff docs we should render it. Sprinkle some markup while at it. Reviewed-by: David Ahern <dsahern@kernel.org> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
38 lines
995 B
ReStructuredText
38 lines
995 B
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0
|
|
|
|
struct sk_buff
|
|
==============
|
|
|
|
:c:type:`sk_buff` is the main networking structure representing
|
|
a packet.
|
|
|
|
Basic sk_buff geometry
|
|
----------------------
|
|
|
|
.. kernel-doc:: include/linux/skbuff.h
|
|
:doc: Basic sk_buff geometry
|
|
|
|
Shared skbs and skb clones
|
|
--------------------------
|
|
|
|
:c:member:`sk_buff.users` is a simple refcount allowing multiple entities
|
|
to keep a struct sk_buff alive. skbs with a ``sk_buff.users != 1`` are referred
|
|
to as shared skbs (see skb_shared()).
|
|
|
|
skb_clone() allows for fast duplication of skbs. None of the data buffers
|
|
get copied, but caller gets a new metadata struct (struct sk_buff).
|
|
&skb_shared_info.refcount indicates the number of skbs pointing at the same
|
|
packet data (i.e. clones).
|
|
|
|
dataref and headerless skbs
|
|
---------------------------
|
|
|
|
.. kernel-doc:: include/linux/skbuff.h
|
|
:doc: dataref and headerless skbs
|
|
|
|
Checksum information
|
|
--------------------
|
|
|
|
.. kernel-doc:: include/linux/skbuff.h
|
|
:doc: skb checksums
|