Date: Mon, 25 Aug 1997 18:20:50 +0200 From: Thomas Berndes <thobe@cs.tu-berlin.de> To: questions FreeBSD Org <freebsd-questions@FreeBSD.org> Subject: Problems developing a network-driver as an kernel-module Message-ID: <3401B0E2.DE4EAB9E@cs.tu-berlin.de>
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<HTML>
<P>Hello FreeBSD-Programmers,
<P>I have a problem, while developing a network-driver for FreeBSD (2.2.1).
<P>The driver, i have written, works fine when linked static with the
<BR>kernel, but something failes when using it as a kernel-module (LKM).
<BR>
<UL>
<LI>
Has anybody a suggestion, about the reason for that failure ??</LI>
</UL>
<UL>
<LI>
Where can i get more doc about the LKM's ?</LI>
</UL>
<UL>
<LI>
Has anybody written a <if_detach()> function, so i can unregister and
unload my driver, which registered with the <if_attach()> function ?</LI>
</UL>
<P>regards,
<P> Thomas Berndes
<P>======================================================================
<P>The next few lines are describing the appearance of the failure:
<P> bash# modload .... -> OK
<P> bash# ifconfig Date0 inet 101.102.103.1 101.102.103.2 netmask
255.255.255.0
<BR> bash# route add -net 101.102.103.0 -netmask 255.255.255.0 -interface
Date0
<BR> add net 101.102.103.0: gateway Date0
<BR>
<BR> bash# ping 101.102.103.22
<BR> PING 101.102.103.22 (101.102.103.22): 56 data bytes
<BR> ping: sendto: No buffer space available
<BR> ping: wrote 101.102.103.22 64 chars, ret=-1
<BR> ping: sendto: No buffer space available
<BR> ping: wrote 101.102.103.22 64 chars, ret=-1
<BR> ^C
<BR> --- 101.102.103.22 ping statistics ---
<BR> 2 packets transmitted, 0 packets received, 100% packet loss
<BR>
<BR>
<P>Hello FreeBSD-Programmers,
<P>I have a problem, while developing a network-driver for FreeBSD (2.2.1).
<P>The driver, i have written, works fine when linked static with the
<BR>kernel, but something failes when using it as a kernel-module (LKM).
<BR>
<P> Has anybody a suggestion, about
the reason for that failure ??
<P>
<P> Where can i get more doc about
the LKM's ?
<P>
<P> Has anybody written a <if_detach()>
function, so i can unregisterand unload my driver, which registered with
the
<BR> <if_attach()> function ?
<P>regards,
<P> Thomas Berndes
<BR>
<BR>
<P>======================================================================
<P>The next few lines are describing the appearance of the failure:
<P> bash# modload .... -> OK
<P> bash# ifconfig Date0 inet 101.102.103.1 101.102.103.2 netmask
255.255.255.0
<BR> bash# route add -net 101.102.103.0 -netmask 255.255.255.0 -interface
Date0
<BR> add net 101.102.103.0: gateway Date0
<BR>
<BR> bash# ping 101.102.103.22
<BR> PING 101.102.103.22 (101.102.103.22): 56 data bytes
<BR> ping: sendto: No buffer space available
<BR> ping: wrote 101.102.103.22 64 chars, ret=-1
<BR> ping: sendto: No buffer space available
<BR> ping: wrote 101.102.103.22 64 chars, ret=-1
<BR> ^C
<BR> --- 101.102.103.22 ping statistics ---
<BR> 2 packets transmitted, 0 packets received, 100% packet loss
<BR>
<BR>
<P>======================================================================
<P>The following lines are an extract from the source-code of the driver.
<P>/* the real initialization of HW and driver */
<BR>uDDK_init_driver( ... ){
<BR> ...
<P> uDDK_P_ifp.if_name = pinfo->name;
<BR> uDDK_P_ifp.if_unit = 0;
<BR> uDDK_P_ifp.if_mtu = 1500;
<BR> uDDK_P_ifp.if_output = uDDK_P_write;
<BR> uDDK_P_ifp.if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
<P> if_attach( &uDDK_P_ifp );
<P> printf( "%s: Driver initialized\n", pdriver_info->name );
<BR> return uDDK_INIT_DRIVER_OK;
<BR>}
<P>struct isa_driver Datedriver = {uDDK_P_probe, uDDK_P_attach, "Date"};
<P>uDDK_Init_Type
<BR>Date_init( uDDK_INIT_ARGS )
<BR>{
<BR> if( uDDK_init_driver( ... )
<BR>}
<P>PSEUDO_SET( Date_init, Date );
<BR>
<BR>
<P>#ifdef MODULE
<P>MOD_MISC ( Date );
<P>int init_module( uDDK_MODULE_ARGS )
<BR>{
<BR> if( uDDK_init_driver( ... )
<BR>}
<P>...
<P>#endif /* MODULE */
<BR> </HTML>
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