On Fri, Nov 29, 2019 at 02:36:10PM -0500, Jeffrey Walton wrote: > I'm trying to run through the example at > https://www.kernel.org/doc/html/latest/networking/tls.html#kernel-tls > . > > I'm working on Fedora 31 x86_64 (fully patched). Running my program results in: > > $ ./ktls > setsockopt failed, 2, No such file or directory > > I observed: > > $ cat /proc/sys/net/ipv4/tcp_available_ulp > $ > > Is there a way to enable ULP at boot? Or is this a kernel config > option? Or maybe I am doing something else wrong? strace gives me: ... socket(AF_INET, SOCK_STREAM, IPPROTO_IP) = 3 setsockopt(3, SOL_TCP, TCP_ULP, [7564404], 4) = -1 ENOENT (No such file or directory) fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(0x88, 0x2), ...}) = 0 brk(NULL) = 0x55d76b14e000 brk(0x55d76b16f000) = 0x55d76b16f000 write(1, "setsockopt failed, 2, No such fi"..., 48setsockopt failed, 2, No such file or directory ) = 48 exit_group(1) = ? +++ exited with 1 +++ $ grep TLS /boot/config-4.19.0-6-amd64 CONFIG_HAVE_COPY_THREAD_TLS=y # CONFIG_TLS is not set # CONFIG_VIDEO_IVTV_DEPRECATED_IOCTLS is not set So you probably need to rebuild the kernel with CONFIG_TLS to get this working. -- Valentin _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
