On Fri, Apr 1, 2016 at 9:21 PM, Brenden Blanco <bbla...@plumgrid.com> wrote: > This patch set introduces new infrastructure for programmatically > processing packets in the earliest stages of rx, as part of an effort > others are calling Express Data Path (XDP) [1]. Start this effort by > introducing a new bpf program type for early packet filtering, before even > an skb has been allocated. > > With this, hope to enable line rate filtering, with this initial > implementation providing drop/allow action only. > > Patch 1 introduces the new prog type and helpers for validating the bpf > program. A new userspace struct is defined containing only len as a field, > with others to follow in the future. > In patch 2, create a new ndo to pass the fd to support drivers. > In patch 3, expose a new rtnl option to userspace. > In patch 4, enable support in mlx4 driver. No skb allocation is required, > instead a static percpu skb is kept in the driver and minimally initialized > for each driver frag. > In patch 5, create a sample drop and count program. With single core, > achieved ~14.5 Mpps drop rate on a 40G mlx4. This includes packet data > access, bpf array lookup, and increment. > Very nice! Do you think this hook will be sufficient to implement a fast forward patch also?
Tom > Interestingly, accessing packet data from the program did not have a > noticeable impact on performance. Even so, future enhancements to > prefetching / batching / page-allocs should hopefully improve the > performance in this path. > > [1] https://github.com/iovisor/bpf-docs/blob/master/Express_Data_Path.pdf > > Brenden Blanco (5): > bpf: add PHYS_DEV prog type for early driver filter > net: add ndo to set bpf prog in adapter rx > rtnl: add option for setting link bpf prog > mlx4: add support for fast rx drop bpf program > Add sample for adding simple drop program to link > > drivers/net/ethernet/mellanox/mlx4/en_netdev.c | 61 ++++++++++ > drivers/net/ethernet/mellanox/mlx4/en_rx.c | 18 +++ > drivers/net/ethernet/mellanox/mlx4/mlx4_en.h | 2 + > include/linux/netdevice.h | 8 ++ > include/uapi/linux/bpf.h | 5 + > include/uapi/linux/if_link.h | 1 + > kernel/bpf/verifier.c | 1 + > net/core/dev.c | 12 ++ > net/core/filter.c | 68 +++++++++++ > net/core/rtnetlink.c | 10 ++ > samples/bpf/Makefile | 4 + > samples/bpf/bpf_load.c | 8 ++ > samples/bpf/netdrvx1_kern.c | 26 +++++ > samples/bpf/netdrvx1_user.c | 155 > +++++++++++++++++++++++++ > 14 files changed, 379 insertions(+) > create mode 100644 samples/bpf/netdrvx1_kern.c > create mode 100644 samples/bpf/netdrvx1_user.c > > -- > 2.8.0 >
