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Add new m_ext type for data for M_NOFREE mbufs, which doesn't actually do

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anything except several assertions.  This type is going to be used for
temporary on stack mbufs, that point into data in receive ring of a NIC,
that shall not be freed.  Such mbuf can not be stored or reallocated, its
life time is current context.
This commit is contained in:
Gleb Smirnoff 2019-01-31 22:37:28 +00:00
parent 919e7b5359
commit eec189c70b
2 changed files with 7 additions and 1 deletions
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7
sys/kern/kern_mbuf.c
View File

@ -847,7 +847,8 @@ mb_free_ext(struct mbuf *m)
*/
if (m->m_flags & M_NOFREE) {
freembuf = 0;
KASSERT(m->m_ext.ext_type == EXT_EXTREF,
KASSERT(m->m_ext.ext_type == EXT_EXTREF ||
m->m_ext.ext_type == EXT_RXRING,
("%s: no-free mbuf %p has wrong type", __func__, m));
} else
freembuf = 1;
@ -891,6 +892,10 @@ mb_free_ext(struct mbuf *m)
("%s: ext_free not set", __func__));
m->m_ext.ext_free(m);
break;
case EXT_RXRING:
KASSERT(m->m_ext.ext_free == NULL,
("%s: ext_free is set", __func__));
break;
default:
KASSERT(m->m_ext.ext_type == 0,
("%s: unknown ext_type", __func__));

1
sys/sys/mbuf.h
View File

@ -443,6 +443,7 @@ struct mbuf {
#define EXT_JUMBO16 5 /* jumbo cluster 16184 bytes */
#define EXT_PACKET 6 /* mbuf+cluster from packet zone */
#define EXT_MBUF 7 /* external mbuf reference */
#define EXT_RXRING 8 /* data in NIC receive ring */
#define EXT_VENDOR1 224 /* for vendor-internal use */
#define EXT_VENDOR2 225 /* for vendor-internal use */