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Finally change the mbuf to have its own fib field instead of stealing

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4 flag bits. This was supposed to happen in 8.0, and again in 2012..

MFC after:	never
This commit is contained in:
Julian Elischer 2013-05-16 16:20:17 +00:00
parent 3ddfb24d3a
commit 4871fc4ab5
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=250700
4 changed files with 20 additions and 28 deletions
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3
sys/conf/NOTES
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@ -571,7 +571,8 @@ options HWPMC_HOOKS # Other necessary kernel hooks
options INET #Internet communications protocols
options INET6 #IPv6 communications protocols
options ROUTETABLES=2 # max 16. 1 is back compatible.
options ROUTETABLES=2 # allocated fibs up to 65536. default is 1.
# but that would be a bad idea as they are large.
options TCP_OFFLOAD # TCP offload support.

14
sys/net/route.c
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@ -68,8 +68,7 @@
#include <vm/uma.h>
/* We use 4 bits in the mbuf flags, thus we are limited to 16 FIBS. */
#define RT_MAXFIBS 16
#define RT_MAXFIBS UINT16_MAX
/* Kernel config default option. */
#ifdef ROUTETABLES
@ -86,17 +85,10 @@
#define RT_NUMFIBS 1
#endif
/* This is read-only.. */
u_int rt_numfibs = RT_NUMFIBS;
SYSCTL_UINT(_net, OID_AUTO, fibs, CTLFLAG_RD, &rt_numfibs, 0, "");
/*
* Allow the boot code to allow LESS than RT_MAXFIBS to be used.
* We can't do more because storage is statically allocated for now.
* (for compatibility reasons.. this will change. When this changes, code should
* be refactored to protocol independent parts and protocol dependent parts,
* probably hanging of domain(9) specific storage to not need the full
* fib * af RNH allocation etc. but allow tuning the number of tables per
* address family).
*/
/* and this can be set too big but will be fixed before it is used */
TUNABLE_INT("net.fibs", &rt_numfibs);
/*

3
sys/netinet6/ip6_output.c
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@ -1126,7 +1126,7 @@ skip_ipsec2:;
IP6STAT_INC(ip6s_odropped);
goto sendorfree;
}
m->m_flags = m0->m_flags & M_COPYFLAGS; /* incl. FIB */
m->m_flags = m0->m_flags & M_COPYFLAGS;
*mnext = m;
mnext = &m->m_nextpkt;
m->m_data += max_linkhdr;
@ -1152,6 +1152,7 @@ skip_ipsec2:;
}
m_cat(m, m_frgpart);
m->m_pkthdr.len = len + hlen + sizeof(*ip6f);
m->m_pkthdr.fibnum = m0->m_pkthdr.fibnum;
m->m_pkthdr.rcvif = NULL;
ip6f->ip6f_reserved = 0;
ip6f->ip6f_ident = id;

28
sys/sys/mbuf.h
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@ -129,6 +129,8 @@ struct pkthdr {
u_int16_t vt_vtag; /* Ethernet 802.1p+q vlan tag */
u_int16_t vt_nrecs; /* # of IGMPv3 records in this chain */
} PH_vt;
u_int16_t fibnum; /* this packet should use this fib */
u_int16_t pad2; /* align to 32 bits */
SLIST_HEAD(packet_tags, m_tag) tags; /* list of packet tags */
};
#define ether_vtag PH_vt.vt_vtag
@ -171,6 +173,7 @@ struct mbuf {
#define m_type m_hdr.mh_type
#define m_flags m_hdr.mh_flags
#define m_nextpkt m_hdr.mh_nextpkt
#define m_fibnum m_hdr.mh_nextpkt
#define m_act m_nextpkt
#define m_pkthdr M_dat.MH.MH_pkthdr
#define m_ext M_dat.MH.MH_dat.MH_ext
@ -205,12 +208,6 @@ struct mbuf {
#define M_FLOWID 0x00400000 /* deprecated: flowid is valid */
#define M_HASHTYPEBITS 0x0F000000 /* mask of bits holding flowid hash type */
/*
* For RELENG_{6,7} steal these flags for limited multiple routing table
* support. In RELENG_8 and beyond, use just one flag and a tag.
*/
#define M_FIB 0xF0000000 /* steal some bits to store fib number. */
#define M_NOTIFICATION M_PROTO5 /* SCTP notification */
/*
@ -258,7 +255,7 @@ struct mbuf {
*/
#define M_COPYFLAGS \
(M_PKTHDR|M_EOR|M_RDONLY|M_PROTOFLAGS|M_SKIP_FIREWALL|M_BCAST|M_MCAST|\
M_FRAG|M_FIRSTFRAG|M_LASTFRAG|M_VLANTAG|M_PROMISC|M_FIB|M_HASHTYPEBITS)
M_FRAG|M_FIRSTFRAG|M_LASTFRAG|M_VLANTAG|M_PROMISC|M_HASHTYPEBITS)
/*
* External buffer types: identify ext_buf type.
@ -1010,17 +1007,18 @@ m_tag_find(struct mbuf *m, int type, struct m_tag *start)
m_tag_locate(m, MTAG_ABI_COMPAT, type, start));
}
/* XXX temporary FIB methods probably eventually use tags.*/
#define M_FIBSHIFT 28
#define M_FIBMASK 0x0F
static int inline
rt_m_getfib(struct mbuf *m)
{
KASSERT(m->m_flags & M_EXT , ("attempt to set FIB on non header mbuf"));
return (m->m_pkthdr.fibnum);
}
/* get the fib from an mbuf and if it is not set, return the default */
#define M_GETFIB(_m) \
((((_m)->m_flags & M_FIB) >> M_FIBSHIFT) & M_FIBMASK)
#define M_GETFIB(_m) rt_m_getfib(_m)
#define M_SETFIB(_m, _fib) do { \
_m->m_flags &= ~M_FIB; \
_m->m_flags |= (((_fib) << M_FIBSHIFT) & M_FIB); \
KASSERT((_m)->m_flags & M_EXT, ("No FIB on non header mbuf")); \
((_m)->m_pkthdr.fibnum) = (_fib); \
} while (0)
#endif /* _KERNEL */