netdev - Re: [PATCH bpf-next v3 0/6] ipv6: sr: introduce seg6local End.BPF action

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Date:   Sun, 6 May 2018 18:33:28 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Mathieu Xhonneux <m.xhonneux@...il.com>
Cc:     netdev@...r.kernel.org, dlebrun@...gle.com
Subject: Re: [PATCH bpf-next v3 0/6] ipv6: sr: introduce seg6local End.BPF
 action

On Sun, May 06, 2018 at 06:27:28PM +0100, Mathieu Xhonneux wrote:
> As of Linux 4.14, it is possible to define advanced local processing for
> IPv6 packets with a Segment Routing Header through the seg6local LWT
> infrastructure. This LWT implements the network programming principles
> defined in the IETF “SRv6 Network Programming” draft.
> 
> The implemented operations are generic, and it would be very interesting to
> be able to implement user-specific seg6local actions, without having to
> modify the kernel directly. To do so, this patchset adds an End.BPF action
> to seg6local, powered by some specific Segment Routing-related helpers,
> which provide SR functionalities that can be applied on the packet. This
> BPF hook would then allow to implement specific actions at native kernel
> speed such as OAM features, advanced SR SDN policies, SRv6 actions like
> Segment Routing Header (SRH) encapsulation depending on the content of
> the packet, etc ... 
> 
> This patchset is divided in 6 patches, whose main features are :
> 
> - A new seg6local action End.BPF with the corresponding new BPF program
>   type BPF_PROG_TYPE_LWT_SEG6LOCAL. Such attached BPF program can be
>   passed to the LWT seg6local through netlink, the same way as the LWT
>   BPF hook operates.
> - 3 new BPF helpers for the seg6local BPF hook, allowing to edit/grow/
>   shrink a SRH and apply on a packet some of the generic SRv6 actions.
> - 1 new BPF helper for the LWT BPF IN hook, allowing to add a SRH through
>   encapsulation (via IPv6 encapsulation or inlining if the packet contains
>   already an IPv6 header).
> 
> As this patchset adds a new LWT BPF hook, I took into account the result of
> the discussions when the LWT BPF infrastructure got merged. Hence, the
> seg6local BPF hook doesn’t allow write access to skb->data directly, only
> the SRH can be modified through specific helpers, which ensures that the
> integrity of the packet is maintained.
> More details are available in the related patches messages.
> 
> The performances of this BPF hook have been assessed with the BPF JIT
> enabled on a Intel Xeon X3440 processors with 4 cores and 8 threads
> clocked at 2.53 GHz. No throughput losses are noted with the seg6local
> BPF hook when the BPF program does nothing (440kpps). Adding a 8-bytes
> TLV (1 call each to bpf_lwt_seg6_adjust_srh and bpf_lwt_seg6_store_bytes)
> drops the throughput to 410kpps, and inlining a SRH via
> bpf_lwt_seg6_action drops the throughput to 420kpps.
> All throughputs are stable.
> 
> -------
> v2: move the SRH integrity state from skb->cb to a per-cpu buffer
> v3: - document helpers in man-page style
>     - fix kbuild bugs
>     - un-break BPF LWT out hook
>     - bpf_push_seg6_encap is now static
>     - preempt_enable is now called when the packet is dropped in
>       input_action_end_bpf

Please fix build issue that 0bot caught and resubmit.

Thanks