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Expound a bit more about the system maximum number of FIBs,

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how it may be set, and current limitations on the value.

Approved by:	hrs (mentor)
PR:		docs/157453
MFC after:	1 week
This commit is contained in:
bjk 2012-03-19 04:46:11 +00:00
parent fa590f133d
commit 9c8c00d33b
1 changed files with 20 additions and 2 deletions
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22
lib/libc/sys/setfib.2
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@ -24,7 +24,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd August 8, 2008
.Dd March 19, 2012
.Dt SETFIB 2
.Os
.Sh NAME
@ -45,10 +45,28 @@ subsequent to the call, to be that of the argument
The
.Fa fib
argument
may be between 0 and the current system maximum which
must be greater than or equal to 0
and less than the current system maximum which
may be retrieved by the
.Va net.fibs
sysctl.
The system maximum is set in the kernel configuration file with
.Pp
.Dl options ROUTETABLES= Ns Em N
.Pp
or in
.Pa /boot/loader.conf
with
.Pp
.Dl net.fibs= Ns Qq Em N
.Pp
where
.Em N
is an integer.
However, this maximum is capped at 16 due to the implementation storing
the fib number in a 4-bit field in
.Xr mbuf 9
flags.
The default fib of the process will be applied to all protocol families
that support multiple fibs, and ignored by those that do not.
The default fib for a process may be overridden for a socket with the use