projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| ddccc9ef JK |
1 | .. SPDX-License-Identifier: GPL-2.0 |
| 2 | ||
| 3 | struct sk_buff | |
| 4 | ============== | |
| 5 | ||
| 6 | :c:type:`sk_buff` is the main networking structure representing | |
| 7 | a packet. | |
| 8 | ||
| 9 | Basic sk_buff geometry | |
| 10 | ---------------------- | |
| 11 | ||
| 12 | .. kernel-doc:: include/linux/skbuff.h | |
| 13 | :doc: Basic sk_buff geometry | |
| 14 | ||
| 15 | Shared skbs and skb clones | |
| 16 | -------------------------- | |
| 17 | ||
| 18 | :c:member:`sk_buff.users` is a simple refcount allowing multiple entities | |
| 19 | to keep a struct sk_buff alive. skbs with a ``sk_buff.users != 1`` are referred | |
| 20 | to as shared skbs (see skb_shared()). | |
| 21 | ||
| 22 | skb_clone() allows for fast duplication of skbs. None of the data buffers | |
| 23 | get copied, but caller gets a new metadata struct (struct sk_buff). | |
| 24 | &skb_shared_info.refcount indicates the number of skbs pointing at the same | |
| 25 | packet data (i.e. clones). | |
| 9ec7ea14 JK |
26 | |
| 27 | dataref and headerless skbs | |
| 28 | --------------------------- | |
| 29 | ||
| 30 | .. kernel-doc:: include/linux/skbuff.h | |
| 31 | :doc: dataref and headerless skbs | |
| 9facd941 JK |
32 | |
| 33 | Checksum information | |
| 34 | -------------------- | |
| 35 | ||
| 36 | .. kernel-doc:: include/linux/skbuff.h | |
| 37 | :doc: skb checksums |