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Message-ID: <cover.1716026761.git.lorenzo@kernel.org>
Date: Sat, 18 May 2024 12:12:34 +0200
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: bpf@...r.kernel.org
Cc: pablo@...filter.org,
kadlec@...filter.org,
davem@...emloft.net,
edumazet@...gle.com,
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ast@...nel.org,
daniel@...earbox.net,
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Subject: [PATCH bpf-next v2 0/4] netfilter: Add the capability to offload flowtable in XDP layer
Introduce bpf_xdp_flow_offload_lookup kfunc in order to perform the
lookup of a given flowtable entry based on the fib tuple of incoming
traffic.
bpf_xdp_flow_offload_lookup can be used as building block to offload
in XDP the sw flowtable processing when the hw support is not available.
This series has been tested running the xdp_flowtable_offload eBPF program
on an ixgbe 10Gbps NIC (eno2) in order to XDP_REDIRECT the TCP traffic to
a veth pair (veth0-veth1) based on the content of the nf_flowtable as soon
as the TCP connection is in the established state:
[tcp client] (eno1) == LAN == (eno2) xdp_flowtable_offload [XDP_REDIRECT] --> veth0 == veth1 [tcp server]
table inet filter {
flowtable ft {
hook ingress priority filter
devices = { eno2, veth0 }
}
chain forward {
type filter hook forward priority filter
meta l4proto { tcp, udp } flow add @ft
}
}
- sw flowtable [1 TCP stream, T = 300s]: ~ 6.2 Gbps
- xdp flowtable [1 TCP stream, T = 300s]: ~ 7.6 Gbps
- sw flowtable [3 TCP stream, T = 300s]: ~ 7.7 Gbps
- xdp flowtable [3 TCP stream, T = 300s]: ~ 8.8 Gbps
Changes since v1:
- return NULL in bpf_xdp_flow_offload_lookup kfunc in case of error
- take into account kfunc registration possible failures
Changes since RFC:
- fix compilation error if BTF is not enabled
Florian Westphal (1):
netfilter: nf_tables: add flowtable map for xdp offload
Lorenzo Bianconi (3):
netfilter: add bpf_xdp_flow_offload_lookup kfunc
samples/bpf: Add bpf sample to offload flowtable traffic to xdp
selftests/bpf: Add selftest for bpf_xdp_flow_offload_lookup kfunc
include/net/netfilter/nf_flow_table.h | 12 +
net/netfilter/Makefile | 5 +
net/netfilter/nf_flow_table_bpf.c | 94 +++
net/netfilter/nf_flow_table_inet.c | 2 +-
net/netfilter/nf_flow_table_offload.c | 161 ++++-
samples/bpf/Makefile | 7 +-
samples/bpf/xdp_flowtable_offload.bpf.c | 591 ++++++++++++++++++
samples/bpf/xdp_flowtable_offload_user.c | 128 ++++
tools/testing/selftests/bpf/Makefile | 10 +-
tools/testing/selftests/bpf/config | 4 +
.../selftests/bpf/progs/xdp_flowtable.c | 141 +++++
.../selftests/bpf/test_xdp_flowtable.sh | 112 ++++
tools/testing/selftests/bpf/xdp_flowtable.c | 142 +++++
13 files changed, 1403 insertions(+), 6 deletions(-)
create mode 100644 net/netfilter/nf_flow_table_bpf.c
create mode 100644 samples/bpf/xdp_flowtable_offload.bpf.c
create mode 100644 samples/bpf/xdp_flowtable_offload_user.c
create mode 100644 tools/testing/selftests/bpf/progs/xdp_flowtable.c
create mode 100755 tools/testing/selftests/bpf/test_xdp_flowtable.sh
create mode 100644 tools/testing/selftests/bpf/xdp_flowtable.c
--
2.45.1
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