Re: OpenBSD 7.9 Octeon release fails to compile without IPV6 - Kernel Compilation Bug - if_ogx.c

On Sat, 13 Jun 2026 08:01:53 +0200,
Gabriel <[email protected]> wrote:
> 
> > Issue: Kernel does not compile if IPV6 support is disabled
> > 
> > Steps to recreate: Install the 7.9 sys release source code on an
> > octeon system.
> > Edit /usr/src/sys/conf/GENERIC and comment out "option INET6"
> > Configure and compile as normal - will fail with the following error:
> > 
> > cc  -g -Werror -Wall -Wimplicit-function-declaration
> > -Wno-pointer-sign  -Wframe-larger-than=2047
> > -Wno-address-of-packed-member -Wno-constant-conversion
> > -Wno-unused-but-set-variable -Wno-gnu-folding-constant -march=mips64r2
> > -mno-abicalls  -msoft-float -G 0 -ffreestanding -fomit-frame-pointer
> > -O2  -pipe -nostdinc -I/usr/sys
> > -I/usr/sys/arch/octeon/compile/EDGE.MP/obj -I/usr/sys/arch
> > -DDIAGNOSTIC -DKTRACE -DACCOUNTING -DKMEMSTATS -DPTRACE -DPOOL_DEBUG
> > -DCRYPTO -DSYSVMSG -DSYSVSEM -DSYSVSHM -DUVM_SWAP_ENCRYPT -DFFS -DFFS2
> > -DUFS_DIRHASH -DQUOTA -DEXT2FS -DMFS -DNFSCLIENT -DNFSSERVER -DCD9660
> > -DUDF -DMSDOSFS -DFIFO -DTMPFS -DFUSE -DSOCKET_SPLICE -DTCP_ECN
> > -DTCP_SIGNATURE -DIPSEC -DPPP_BSDCOMP -DPPP_DEFLATE -DPIPEX -DMROUTING
> > -DMPLS -DBOOT_CONFIG -DCPU_MIPS64R2 -DCPU_OCTEON -DFPUEMUL
> > -DMIPS_PTE64 -DPCIVERBOSE -DUSER_PCICONF -DUSBVERBOSE -DONEWIREVERBOSE
> > -DMULTIPROCESSOR -DMAXUSERS=32 -D_KERNEL -D__octeon__ -MD -MP -c
> > /usr/sys/arch/octeon/dev/if_ogx.c
> > /usr/sys/arch/octeon/dev/if_ogx.c:1282:22: error: invalid application
> > of 'sizeof' to an incomplete type 'struct ip6_hdr'
> >  1282 |                         hdr |= (ehdrlen + sizeof(struct
> > ip6_hdr)) <<
> >       |                                           ^  ~~~~~~~~~~~~~~~~
> > /usr/sys/netinet/if_ether.h:306:9: note: forward declaration of
> > 'struct ip6_hdr'
> >   306 |         struct ip6_hdr                  *ip6;
> >       |                ^
> > 1 error generated.
> > *** Error 1 in /usr/sys/arch/octeon/compile/EDGE.MP (Makefile:627
> > 'if_ogx.o')
> > root@defender /usr/sys/arch/octeon/compile/EDGE.MP>
> > 
> > Sincerely,
> > 
> > Gabriel
> > 
> > 
> > 

Here a diff which fixes build on my octeon. I also tested the same idea:
without IPv6 on amd64 and arm64, and it builds fine.


Index: sys/arch/octeon/dev/if_ogx.c
===================================================================
RCS file: /home/cvs/src/sys/arch/octeon/dev/if_ogx.c,v
diff -u -p -r1.7 if_ogx.c
--- sys/arch/octeon/dev/if_ogx.c	20 May 2024 23:13:33 -0000	1.7
+++ sys/arch/octeon/dev/if_ogx.c	13 Jun 2026 10:44:07 -0000
@@ -1277,11 +1277,13 @@ ogx_send_mbuf(struct ogx_softc *sc, stru
 			hdr |= (ehdrlen + sizeof(struct ip)) <<
 			    PKO3_SEND_HDR_L4PTR_S;
 			break;
+#ifdef INET6
 		case ETHERTYPE_IPV6:
 			hdr |= ehdrlen << PKO3_SEND_HDR_L3PTR_S;
 			hdr |= (ehdrlen + sizeof(struct ip6_hdr)) <<
 			    PKO3_SEND_HDR_L4PTR_S;
 			break;
+#endif
 		default:
 			break;
 		}



-- 
wbr, Kirill