Date: Tue, 19 Feb 2002 16:26:48 -0500 From: Andrew Gallatin <gallatin@cs.duke.edu> To: Max Khon <fjoe@FreeBSD.org> Cc: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/net if.c if_arc.h if_arp.h if_ethersubr.c if_fddisubr.c if_iso88025subr.c if_var.h if_vlan.c src/sys/netinet if_ether.c if_ether.h Message-ID: <20020219162648.A52559@grasshopper.cs.duke.edu> In-Reply-To: <200202132138.g1DLcuB88159@freefall.freebsd.org>; from fjoe@FreeBSD.org on Wed, Feb 13, 2002 at 01:38:56PM -0800 References: <200202132138.g1DLcuB88159@freefall.freebsd.org>
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Max Khon [fjoe@FreeBSD.org] wrote:
> fjoe 2002/02/13 13:38:56 PST
<...>
> Log:
> MFC: ARP support for variable length link level addresses
<...>
> 1.18.2.13 +4 -0 src/sys/net/if_var.h
The addition of a pointer ( u_int8_t *if_broadcastaddr;) into struct
ifnet breaks binary compatability in the 4-stable series for 3rd party
network drivers by moving the ac_enaddr[] field down in struct arpcom.
Eg, for a binary module compiled on 4.1.1 (which worked fine up to
now) I now see this:
myri0: flags=843<UP,BROADCAST,RUNNING,SIMPLEX> mtu 9000
inet 192.168.1.4 netmask 0xffffff00 broadcast 192.168.1.255
ether 57:98:00:00:00:00
When I should see this:
myri0: flags=843<UP,BROADCAST,RUNNING,SIMPLEX> mtu 9000
inet 192.168.1.4 netmask 0xffffff00 broadcast 192.168.1.255
ether 00:60:dd:7f:57:98
Note the mac address is shifted over by the size of a pointer.
I'd greatly appreciate it if you could find somewhere else to put
this pointer that does not break binary compatbility.
Thanks!
Drew
(Wearing his Myricom Inc. hat).
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