On 6/22/2018 4:40 PM, Yifeng Sun wrote:
Hi Greg,
I am debugging a GRE related issue. Do you mind telling me which
kernel version will lead to (err == -EEXIST) here?
else if (err == -EEXIST)
pr_warn("Cannot take GRE protocol entry - The ERSPAN
feature may not be supported\n");
Thanks,
Yifeng
Yifeng,
I don't think it is kernel specific unless it is a very new kernel (4.16
or newer).
The -EEXIST comes from ../datapath/linux/compat/gre.c in rpl_gre_init()
int rpl_gre_init(void)
{
pr_info("GRE over IPv4 demultiplexor driver\n");
if (inet_add_protocol(&net_gre_protocol, IPPROTO_GRE) < 0) {
pr_err("can't add protocol\n");
return -EEXIST;
}
return 0;
}
Hope this helps,
- Greg
On Tue, Jun 5, 2018 at 10:56 AM, Gregory Rose <[email protected]
<mailto:[email protected]>> wrote:
On 6/5/2018 10:39 AM, Ben Pfaff wrote:
On Tue, Jun 05, 2018 at 09:34:10AM -0700, Gregory Rose wrote:
On 6/5/2018 9:07 AM, William Tu wrote:
On Mon, Jun 4, 2018 at 1:14 PM, Greg Rose
<[email protected] <mailto:[email protected]>>
wrote:
The ERSPAN feature depends on the gre kernel
module so on systems where
the ERSPAN feature isn't supported the openvswitch
kernel module would
attempt to grab the ipv4 GRE protocol entry point
and would fail to load
if it could not.
This patch modifies openvswitch to not fail to
load when the gre kernel
module is loaded and instead it will print a
warning message to the
kernel system log indicating that the ERSPAN
feature may not be
available.
We need this patch because users are experiencing
failures due to the
conflicts and high priority bugs are resulting.
Signed-off-by: Greg Rose <[email protected]
<mailto:[email protected]>>
---
I read through the patch and look good to me.
Acked-by: William Tu <[email protected]
<mailto:[email protected]>>
Thanks William.
After loading the ip_gre and gre kernel modules you can
run a 'make
check-kmod' test with those modules
loaded and the results look good as well.
I applied this series to master. I added a reference to the
thread
where Jiri nacked the previous solution.
Thank you!
- Greg
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