Author: glebius
Date: Thu Jan 31 22:37:28 2019
New Revision: 343627
URL: https://svnweb.freebsd.org/changeset/base/343627
Log:
Add new m_ext type for data for M_NOFREE mbufs, which doesn't actually do
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.
Modified:
head/sys/kern/kern_mbuf.c
head/sys/sys/mbuf.h
Modified: head/sys/kern/kern_mbuf.c
==============================================================================
--- head/sys/kern/kern_mbuf.c Thu Jan 31 22:27:39 2019 (r343626)
+++ head/sys/kern/kern_mbuf.c Thu Jan 31 22:37:28 2019 (r343627)
@@ -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;
@@ -890,6 +891,10 @@ mb_free_ext(struct mbuf *m)
KASSERT(m->m_ext.ext_free != NULL,
("%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,
Modified: head/sys/sys/mbuf.h
==============================================================================
--- head/sys/sys/mbuf.h Thu Jan 31 22:27:39 2019 (r343626)
+++ head/sys/sys/mbuf.h Thu Jan 31 22:37:28 2019 (r343627)
@@ -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 */
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