On Tue, 9 Mar 2021 at 20:12, Eric Dumazet <eric.duma...@gmail.com> wrote: > > On 3/9/21 5:43 AM, Tony Lu wrote: > > There are lots of net namespaces on the host runs containers like k8s. > > It is very common to see the same interface names among different net > > namespaces, such as eth0. It is not possible to distinguish them without > > net namespace inode. > > > > This adds net namespace inode for all net_dev events, help us > > distinguish between different net devices. > > > > Output: > > <idle>-0 [006] ..s. 133.306989: net_dev_xmit: net_inum=4026531992 > > dev=eth0 skbaddr=0000000011a87c68 len=54 rc=0 > > > > Signed-off-by: Tony Lu <ton...@linux.alibaba.com> > > --- > > > > There was a proposal from Lorenz to use netns cookies (SO_NETNS_COOKIE) > instead. > > They have a guarantee of being not reused. > > After 3d368ab87cf6681f9 ("net: initialize net->net_cookie at netns setup") > net->net_cookie is directly available.
The patch set is at https://lore.kernel.org/bpf/20210219154330.93615-1-...@cloudflare.com/ but I decided to abandon it. I can work around my issue by comparing the netns inode of two processes, which is "good enough" for now. -- Lorenz Bauer | Systems Engineer 6th Floor, County Hall/The Riverside Building, SE1 7PB, UK www.cloudflare.com