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mbuf: provide m_freemp()

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This function follows both m_nextpkt and m_next linkage freeing all mbufs.
Note that existing m_freem() follows only m_next.

Reviewed by:		khng
Differential Revision:	https://reviews.freebsd.org/D45477

(cherry picked from commit badf44cc21)
This commit is contained in:
Gleb Smirnoff 2024-06-10 18:31:02 -07:00
parent 55c5dad2f3
commit a3f7b81fdd
3 changed files with 24 additions and 0 deletions
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19
sys/kern/kern_mbuf.c
View file

@ -1569,6 +1569,25 @@ m_freem(struct mbuf *mb)
mb = m_free(mb);
}
/*
* Free an entire chain of mbufs and associated external buffers, following
* both m_next and m_nextpkt linkage.
* Note: doesn't support NULL argument.
*/
void
m_freemp(struct mbuf *m)
{
struct mbuf *n;
MBUF_PROBE1(m__freemp, m);
do {
n = m->m_nextpkt;
while (m != NULL)
m = m_free(m);
m = n;
} while (m != NULL);
}
/*
* Temporary primitive to allow freeing without going through m_free.
*/

3
sys/kern/uipc_mbuf.c
View file

@ -113,6 +113,9 @@ SDT_PROBE_DEFINE1_XLATE(sdt, , , m__free,
SDT_PROBE_DEFINE1_XLATE(sdt, , , m__freem,
"struct mbuf *", "mbufinfo_t *");
SDT_PROBE_DEFINE1_XLATE(sdt, , , m__freemp,
"struct mbuf *", "mbufinfo_t *");
#include <security/mac/mac_framework.h>
/*

2
sys/sys/mbuf.h
View file

@ -67,6 +67,7 @@ SDT_PROBE_DECLARE(sdt, , , m__cljget);
SDT_PROBE_DECLARE(sdt, , , m__cljset);
SDT_PROBE_DECLARE(sdt, , , m__free);
SDT_PROBE_DECLARE(sdt, , , m__freem);
SDT_PROBE_DECLARE(sdt, , , m__freemp);
#endif /* _KERNEL */
@ -844,6 +845,7 @@ void m_extadd(struct mbuf *, char *, u_int, m_ext_free_t,
u_int m_fixhdr(struct mbuf *);
struct mbuf *m_fragment(struct mbuf *, int, int);
void m_freem(struct mbuf *);
void m_freemp(struct mbuf *);
void m_free_raw(struct mbuf *);
struct mbuf *m_get2(int, int, short, int);
struct mbuf *m_get3(int, int, short, int);