> Similar to what David Ahern proposed in [1] for DEVMAPs, introduce the > capability to attach and run a XDP program to CPUMAP entries. > The idea behind this feature is to add the possibility to define on which CPU > run the eBPF program if the underlying hw does not support RSS. > I respin patch 1/6 from a previous series sent by David [2]. > The functionality has been tested on Marvell Espressobin, i40e and mlx5. > Detailed tests results can be found here: > https://github.com/xdp-project/xdp-project/blob/master/areas/cpumap/cpumap04-map-xdp-prog.org > Hi Alexei and Daniel, I will post a v7 since v6 does not apply anymore to bpf-next. Regards, Lorenzo > Changes since v5: > - move bpf_prog_put() in put_cpu_map_entry() > - remove READ_ONCE(rcpu->prog) in cpu_map_bpf_prog_run_xdp > - rely on bpf_prog_get_type() instead of bpf_prog_get_type_dev() in > __cpu_map_load_bpf_program() > > Changes since v4: > - move xdp_clear_return_frame_no_direct inside rcu section > - update David Ahern's email address > > Changes since v3: > - fix typo in commit message > - fix access to ctx->ingress_ifindex in cpumap bpf selftest > > Changes since v2: > - improved comments > - fix return value in xdp_convert_buff_to_frame > - added patch 1/9: "cpumap: use non-locked version __ptr_ring_consume_batched" > - do not run kmem_cache_alloc_bulk if all frames have been consumed by the XDP > program attached to the CPUMAP entry > - removed bpf_trace_printk in kselftest > > Changes since v1: > - added performance test results > - added kselftest support > - fixed memory accounting with page_pool > - extended xdp_redirect_cpu_user.c to load an external program to perform > redirect > - reported ifindex to attached eBPF program > - moved bpf_cpumap_val definition to include/uapi/linux/bpf.h > > [1] https://patchwork.ozlabs.org/project/netdev/cover/20200529220716.75383-1-dsahern@xxxxxxxxxx/ > [2] https://patchwork.ozlabs.org/project/netdev/patch/20200513014607.40418-2-dsahern@xxxxxxxxxx/ > > David Ahern (1): > net: refactor xdp_convert_buff_to_frame > > Jesper Dangaard Brouer (1): > cpumap: use non-locked version __ptr_ring_consume_batched > > Lorenzo Bianconi (7): > samples/bpf: xdp_redirect_cpu_user: do not update bpf maps in option > loop > cpumap: formalize map value as a named struct > bpf: cpumap: add the possibility to attach an eBPF program to cpumap > bpf: cpumap: implement XDP_REDIRECT for eBPF programs attached to map > entries > libbpf: add SEC name for xdp programs attached to CPUMAP > samples/bpf: xdp_redirect_cpu: load a eBPF program on cpumap > selftest: add tests for XDP programs in CPUMAP entries > > include/linux/bpf.h | 6 + > include/net/xdp.h | 41 ++-- > include/trace/events/xdp.h | 16 +- > include/uapi/linux/bpf.h | 14 ++ > kernel/bpf/cpumap.c | 159 ++++++++++--- > net/core/dev.c | 9 + > samples/bpf/xdp_redirect_cpu_kern.c | 25 ++- > samples/bpf/xdp_redirect_cpu_user.c | 209 ++++++++++++++++-- > tools/include/uapi/linux/bpf.h | 14 ++ > tools/lib/bpf/libbpf.c | 2 + > .../bpf/prog_tests/xdp_cpumap_attach.c | 70 ++++++ > .../bpf/progs/test_xdp_with_cpumap_helpers.c | 36 +++ > 12 files changed, 529 insertions(+), 72 deletions(-) > create mode 100644 tools/testing/selftests/bpf/prog_tests/xdp_cpumap_attach.c > create mode 100644 tools/testing/selftests/bpf/progs/test_xdp_with_cpumap_helpers.c > > -- > 2.26.2 >
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