The BPF-helpers for FIB lookup (bpf_xdp_fib_lookup and bpf_skb_fib_lookup)
can perform MTU check and return BPF_FIB_LKUP_RET_FRAG_NEEDED. The BPF-prog
don't know the MTU value that caused this rejection.
If the BPF-prog wants to implement PMTU (Path MTU Discovery) (rfc1191) it
need to know this M
On 10/27/20 10:26 AM, Jesper Dangaard Brouer wrote:
> The BPF-helpers for FIB lookup (bpf_xdp_fib_lookup and bpf_skb_fib_lookup)
> can perform MTU check and return BPF_FIB_LKUP_RET_FRAG_NEEDED. The BPF-prog
> don't know the MTU value that caused this rejection.
>
> If the BPF-prog wants to implem
Hi Jesper,
url:
https://github.com/0day-ci/linux/commits/Jesper-Dangaard-Brouer/bpf-New-approach-for-BPF-MTU-handling/20201028-002919
base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git master
config: i386-randconfig-m021-20201026 (attached as .config)
compiler: gcc-9 (Debian 9
On Wed, 28 Oct 2020 15:49:42 +0300
Dan Carpenter wrote:
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot
> Reported-by: Dan Carpenter
>
> New smatch warnings:
> net/core/filter.c:5395 bpf_ipv4_fib_lookup() error: uninitialized symbol
> 'mtu'.
I
On Tue, 27 Oct 2020 11:15:31 -0600
David Ahern wrote:
> On 10/27/20 10:26 AM, Jesper Dangaard Brouer wrote:
> > The BPF-helpers for FIB lookup (bpf_xdp_fib_lookup and bpf_skb_fib_lookup)
> > can perform MTU check and return BPF_FIB_LKUP_RET_FRAG_NEEDED. The BPF-prog
> > don't know the MTU value
