Date: Thu, 31 Jan 2019 22:37:28 +0000 (UTC) From: Gleb Smirnoff <glebius@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r343627 - in head/sys: kern sys Message-ID: <201901312237.x0VMbS8u085022@repo.freebsd.org>
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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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