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Define an mbuf type, MT_TAG, used for volatile annotations

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prepended to mbuf chains in the network stack.
Reuse a previoulsy unused value to avoid changes in other
data structures.
This commit is contained in:
Luigi Rizzo 2002-06-22 11:29:08 +00:00
parent 0ec563a548
commit dcb9465082
1 changed files with 3 additions and 2 deletions
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5
sys/sys/mbuf.h
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@ -204,6 +204,7 @@ struct mbuf {
#define MT_RIGHTS 12 /* access rights */
#define MT_IFADDR 13 /* interface address */
#endif
#define MT_TAG 13 /* volatile metadata associated to pkts */
#define MT_CONTROL 14 /* extra-data protocol message */
#define MT_OOBDATA 15 /* expedited data */
#define MT_NTYPES 16 /* number of mbuf types for mbtypes[] */
@ -419,10 +420,10 @@ struct mauxtag {
*
* As a temporary and low impact solution to replace the even uglier
* approach used so far in some parts of the network stack (which relies
* on global variables), these annotations are stored in MT_CONTROL
* on global variables), these annotations are stored in MT_TAG
* mbufs (or lookalikes) prepended to the actual mbuf chain.
*
* m_type = MT_CONTROL
* m_type = MT_TAG
* m_flags = m_tag_id
* m_next = next buffer in chain.
*