[PATCH dpdk] net: ipv6 link local compliance with rfc 4291

[Stephen Hemminger]

On Fri, 14 Nov 2025 11:57:53 +0100
Robin Jarry <rjarry at redhat.com> wrote:

> diff --git a/app/test/test_net_ip6.c b/app/test/test_net_ip6.c
> index cfc550940306..e4642c9a39d9 100644
> --- a/app/test/test_net_ip6.c
> +++ b/app/test/test_net_ip6.c
> @@ -160,7 +160,7 @@ test_ipv6_llocal_from_ethernet(void)
>  {
>  	const struct rte_ether_addr local_mac = {{0x04, 0x7b, 0xcb, 0x5c, 0x08, 0x44}};
>  	const struct rte_ipv6_addr local_ip =
> -		RTE_IPV6(0xfe80, 0, 0, 0, 0x047b, 0xcbff, 0xfe5c, 0x0844);
> +		RTE_IPV6(0xfe80, 0, 0, 0, 0x067b, 0xcbff, 0xfe5c, 0x0844);
>  	struct rte_ipv6_addr ip;

Reading the kernel source there is also special handling to include device
id into link local address. This is to handle corner case where multiple network
cards have same hardware MAC address.

Perhaps DPDK should roll port id into link local address?