Date: Tue, 19 Jul 2005 22:03:23 GMT From: Sam Leffler <sam@FreeBSD.org> To: Perforce Change Reviews <perforce@freebsd.org> Subject: PERFORCE change 80557 for review Message-ID: <200507192203.j6JM3NaI093024@repoman.freebsd.org>
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http://perforce.freebsd.org/chv.cgi?CH=80557 Change 80557 by sam@sam_ebb on 2005/07/19 22:03:05 add m_align; a function that aligns an arbitrary mbuf Affected files ... .. //depot/projects/wifi/sys/kern/uipc_mbuf.c#11 edit .. //depot/projects/wifi/sys/sys/mbuf.h#11 edit Differences ... ==== //depot/projects/wifi/sys/kern/uipc_mbuf.c#11 (text+ko) ==== @@ -1382,3 +1382,22 @@ m_freem(m_final); return (NULL); } + +/* + * Set the m_data pointer of a newly-allocated mbuf + * to place an object of the specified size at the + * end of the mbuf, longword aligned. + */ +void +m_align(struct mbuf *m, int len) +{ + int adjust; + + if (m->m_flags & M_EXT) + adjust = m->m_ext.ext_size - len; + else if (m->m_flags & M_PKTHDR) + adjust = MHLEN - len; + else + adjust = MLEN - len; + m->m_data += adjust &~ (sizeof(long)-1); +} ==== //depot/projects/wifi/sys/sys/mbuf.h#11 (text+ko) ==== @@ -562,6 +562,7 @@ struct uio; +void m_align(struct mbuf *, int); void m_adj(struct mbuf *, int); int m_apply(struct mbuf *, int, int, int (*)(void *, void *, u_int), void *);
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