Thank you all for joining today. Please find my notes from the meeting below.
=== Works in progress ===
Tracing:
* add hw cache events reading support in PERF_EVENT_ARRAY (brenden)
* working on nmi support for bpf tracing (alexei)
- to attach programs when counters are firing (overflow wakeup_xxx)
XDP:
* add improved rcu protection to mlx4 rx path (brenden)
* prefetch tuneable in xdp (or elsewhere) netlink
* mlx4 refactoring of TX rings
(mlx5 is TBD - prototyped but not concrete yet)
* ixgbe support starting (intel)
* e1000 would be very nice to have (william tu?)
- as template for others to follow
- needs recycling logic
- needs to take lock - only 1 tx ring assumed currently
TC:
* cls_bpf needs test harness (daniel)
* defrag (ipv4) support in cls_bpf (daniel)
- redirects to upper stack, and last packet in frag goes to bpf again
LSM:
* Next drop possible near end of month
* use case: want to be able to write to kernel memory
current_in_cgroup (sargun):
* should be able to land with a few more alterations
* todo: bcc tools support for filtering by cgroup once landed (brenden)
ceth (huawei):
- trying to integrate xdp hook into i40e driver
- mlx4 integration with ceth+xdp
=== Discussion of upcoming events ===
LinuxCon Aug 22-24
* Thomas Graf to present Cilium
Aug 23 Brendan Gregg @fb
* email alexei for invites if interested
Facebook @Scale Aug 31
* email alexei for invites if interested
Tracing iovisor meetup in Sept @fb, details TBD
- Similar proposed format to XDP meetup
Netdev in Oct, Tokyo (see netdev mailer for details)
Topics being proposed:
* xdp talk from Tom, Yunsong
* cls_bpf from Daniel
* ktls from facebook
* ILA from prem @ barefoot
* netronome: offloading
Plumbers in Nov @ Santa Fe
* Needs tracing topics!
USENIX LISA16 Dec 4-9
* sasha + brendan = perf+bpf tutorial
Linuxcon Australia jan
Brendan = bpf?
Brendan reminds us all to attend more conferences, write more blogs, etc.!
Spread the word :)
Idea for blog post on power of BPF in networking:
tc+bpf vs iptables filtering for ingress filtering of a source address
Late update from William Tu on OVS->BPF:
* goal: how to offload parsing+lookup+actions with bpf
- starting with parsing
- lookup
- ovs installs entries into bpf map
- ovs actions:
- redirect - ok
- tunnel - set tunnel key - ok
- upcall - difficult, using event output
- how to push packet down to program
- daniel: AF_PACKET?
- conntrack helper - doable
- daniel says was able to implement connection tracking directly with bpf maps
=== Attendees ===
Jakub Kicinski
Alban Crequy
Brenden Blanco
Daniel Borkmann
Kyle Laracey
Nicolaas Viljoen
Sargun Dhillon
Prem Jonnalagadda
William Tu
Alexei Starovoitov
Brendan Gregg
Yan Chen
Wenzhe
