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Add MEXT_ALIGN() macro, similar to M_ALIGN() and MH_ALIGN(), but for

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mbufs with external buffer.
This commit is contained in:
Gleb Smirnoff 2013-03-17 07:39:45 +00:00
parent 7525c48111
commit 23909ac90d
1 changed files with 13 additions and 1 deletions
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14
sys/sys/mbuf.h
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@ -195,7 +195,7 @@ struct mbuf {
#define M_FIRSTFRAG 0x00001000 /* packet is first fragment */
#define M_LASTFRAG 0x00002000 /* packet is last fragment */
#define M_SKIP_FIREWALL 0x00004000 /* skip firewall processing */
#define M_FREELIST 0x00008000 /* mbuf is on the free list */
/* 0x00008000 free */
#define M_VLANTAG 0x00010000 /* ether_vtag is valid */
#define M_PROMISC 0x00020000 /* packet was not for us */
#define M_NOFREE 0x00040000 /* do not free mbuf, embedded in cluster */
@ -707,6 +707,18 @@ m_last(struct mbuf *m)
(m)->m_data += (MHLEN - (len)) & ~(sizeof(long) - 1); \
} while (0)
/*
* As above, for mbuf with external storage.
*/
#define MEXT_ALIGN(m, len) do { \
KASSERT((m)->m_flags & M_EXT, \
("%s: MEXT_ALIGN not an M_EXT mbuf", __func__)); \
KASSERT((m)->m_data == (m)->m_ext.ext_buf, \
("%s: MEXT_ALIGN not a virgin mbuf", __func__)); \
(m)->m_data += ((m)->m_ext.ext_size - (len)) & \
~(sizeof(long) - 1); \
} while (0)
/*
* Compute the amount of space available before the current start of data in
* an mbuf.