[PATCH bpf-next V2 0/4] Bulk optimization for XDP cpumap redirect

[Jesper Dangaard Brouer <brouer@redhat.com>]

This patchset utilize a number of different kernel bulk APIs for optimizing
the performance for the XDP cpumap redirect feature.

Benchmark details are available here:
 https://github.com/xdp-project/xdp-project/blob/master/areas/cpumap/cpumap03-optimizations.org

Performance measurements can be considered micro benchmarks, as they measure
dropping packets at different stages in the network stack.
Summary based on above:

Baseline benchmarks
- baseline-redirect: UdpNoPorts: 3,180,074
- baseline-redirect: iptables-raw drop: 6,193,534

Patch1: bpf: cpumap use ptr_ring_consume_batched
- redirect: UdpNoPorts: 3,327,729
- redirect: iptables-raw drop: 6,321,540

Patch2: net: core: introduce build_skb_around
- redirect: UdpNoPorts: 3,221,303
- redirect: iptables-raw drop: 6,320,066

Patch3: bpf: cpumap do bulk allocation of SKBs
- redirect: UdpNoPorts: 3,290,563
- redirect: iptables-raw drop: 6,650,112

Patch4: bpf: cpumap memory prefetchw optimizations for struct page
- redirect: UdpNoPorts: 3,520,250
- redirect: iptables-raw drop: 7,649,604

In this V2 submission I have chosen drop the SKB-list patch using
netif_receive_skb_list() as it was not showing a performance improvement for
these micro benchmarks.

---

Jesper Dangaard Brouer (4):
      bpf: cpumap use ptr_ring_consume_batched
      net: core: introduce build_skb_around
      bpf: cpumap do bulk allocation of SKBs
      bpf: cpumap memory prefetchw optimizations for struct page


 include/linux/skbuff.h |    2 +
 kernel/bpf/cpumap.c    |   53 +++++++++++++++++++++++++-----------
 net/core/skbuff.c      |   71 +++++++++++++++++++++++++++++++++++-------------
 3 files changed, 91 insertions(+), 35 deletions(-)

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