Re: [PATCH] test/passt/ndp: Add delay in SLAAC prefix test before looking for kernel_ra address

[David Gibson <david@gibson.dropbear.id.au>]

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On Mon, Nov 25, 2024 at 11:37:19AM +0100, Stefano Brivio wrote:
> I'm not exactly sure why we need this delay, but commit 9a0e544f05bf
> ("test: Improve test for NDP assigned prefix") broke the tests for me.
> 
> I think it's because the kernel (at least all the versions I'm testing
> with) might not mark an address as 'kernel_ra' right away, so the jq
> expression doesn't return any result when we check.
> 
> Fixes: 9a0e544f05bf ("test: Improve test for NDP assigned prefix")
> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

This will do the job, but I think we can do better.  There's logic
above this to explicitly wait for DAD which doesn't seem to be
working.  Having another look at it, I think that's just because the
conditions I used are a bit sloppy.  I'm about to send a patch which
improves them, which I hope will fix the problem you're seeing.

> ---
>  test/passt/ndp | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/test/passt/ndp b/test/passt/ndp
> index 56b385b..9a1c9a4 100644
> --- a/test/passt/ndp
> +++ b/test/passt/ndp
> @@ -23,6 +23,7 @@ hout	HOST_IFNAME6 ip -j -6 route show|jq -rM '[.[] | select(.dst == "default").d
>  check	[ -n "__IFNAME__" ]
>  
>  test	SLAAC: prefix
> +sleep	2
>  gout	ADDR6 ip -j -6 addr show|jq -rM '[.[] | select(.ifname == "__IFNAME__").addr_info[] | select(.scope == "global" and .protocol == "kernel_ra") | .local + "/" + (.prefixlen | tostring)] | .[0]'
>  gout	PREFIX6 sipcalc __ADDR6__ | grep prefix | cut -d' ' -f4
>  hout	HOST_ADDR6 ip -j -6 addr show|jq -rM '[.[] | select(.ifname == "__HOST_IFNAME6__").addr_info[] | select(.scope == "global" and .deprecated != true).local] | .[0]'

-- 
David Gibson (he or they)	| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you, not the other way
				| around.
http://www.ozlabs.org/~dgibson

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