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linux/tools/testing/selftests/bpf/xdp_metadata.h

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selftests/bpf: Verify xdp_metadata xdp->af_xdp path - create new netns - create veth pair (veTX+veRX) - setup AF_XDP socket for both interfaces - attach bpf to veRX - send packet via veTX - verify the packet has expected metadata at veRX Cc: John Fastabend <john.fastabend@gmail.com> Cc: David Ahern <dsahern@gmail.com> Cc: Martin KaFai Lau <martin.lau@linux.dev> Cc: Jakub Kicinski <kuba@kernel.org> Cc: Willem de Bruijn <willemb@google.com> Cc: Jesper Dangaard Brouer <brouer@redhat.com> Cc: Anatoly Burakov <anatoly.burakov@intel.com> Cc: Alexander Lobakin <alexandr.lobakin@intel.com> Cc: Magnus Karlsson <magnus.karlsson@gmail.com> Cc: Maryam Tahhan <mtahhan@redhat.com> Cc: xdp-hints@xdp-project.net Cc: netdev@vger.kernel.org Signed-off-by: Stanislav Fomichev <sdf@google.com> Link: https://lore.kernel.org/r/20230119221536.3349901-12-sdf@google.com Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
2023-01-20 06:15:30 +08:00
/* SPDX-License-Identifier: GPL-2.0 */
#pragma once
#ifndef ETH_P_IP
#define ETH_P_IP 0x0800
#endif
#ifndef ETH_P_IPV6
#define ETH_P_IPV6 0x86DD
#endif
struct xdp_meta {
__u64 rx_timestamp;
selftests/bpf: xdp_hw_metadata track more timestamps To correlate the hardware RX timestamp with something, add tracking of two software timestamps both clock source CLOCK_TAI (see description in man clock_gettime(2)). XDP metadata is extended with xdp_timestamp for capturing when XDP received the packet. Populated with BPF helper bpf_ktime_get_tai_ns(). I could not find a BPF helper for getting CLOCK_REALTIME, which would have been preferred. In userspace when AF_XDP sees the packet another software timestamp is recorded via clock_gettime() also clock source CLOCK_TAI. Example output shortly after loading igc driver: poll: 1 (0) skip=1 fail=0 redir=2 xsk_ring_cons__peek: 1 0x12557a8: rx_desc[1]->addr=100000000009000 addr=9100 comp_addr=9000 rx_hash: 0x82A96531 with RSS type:0x1 rx_timestamp: 1681740540304898909 (sec:1681740540.3049) XDP RX-time: 1681740577304958316 (sec:1681740577.3050) delta sec:37.0001 (37000059.407 usec) AF_XDP time: 1681740577305051315 (sec:1681740577.3051) delta sec:0.0001 (92.999 usec) 0x12557a8: complete idx=9 addr=9000 The first observation is that the 37 sec difference between RX HW vs XDP timestamps, which indicate hardware is likely clock source CLOCK_REALTIME, because (as of this writing) CLOCK_TAI is initialised with a 37 sec offset. The 93 usec (microsec) difference between XDP vs AF_XDP userspace is the userspace wakeup time. On this hardware it was caused by CPU idle sleep states, which can be reduced by tuning /dev/cpu_dma_latency. View current requested/allowed latency bound via: hexdump --format '"%d\n"' /dev/cpu_dma_latency More explanation of the output and how this can be used to identify clock drift for the HW clock can be seen here[1]: [1] https://github.com/xdp-project/xdp-project/blob/master/areas/hints/xdp_hints_kfuncs02_driver_igc.org Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Stanislav Fomichev <sdf@google.com> Acked-by: Song Yoong Siang <yoong.siang.song@intel.com> Link: https://lore.kernel.org/bpf/168182466298.616355.2544377890818617459.stgit@firesoul
2023-04-18 21:31:03 +08:00
__u64 xdp_timestamp;
selftests/bpf: Verify xdp_metadata xdp->af_xdp path - create new netns - create veth pair (veTX+veRX) - setup AF_XDP socket for both interfaces - attach bpf to veRX - send packet via veTX - verify the packet has expected metadata at veRX Cc: John Fastabend <john.fastabend@gmail.com> Cc: David Ahern <dsahern@gmail.com> Cc: Martin KaFai Lau <martin.lau@linux.dev> Cc: Jakub Kicinski <kuba@kernel.org> Cc: Willem de Bruijn <willemb@google.com> Cc: Jesper Dangaard Brouer <brouer@redhat.com> Cc: Anatoly Burakov <anatoly.burakov@intel.com> Cc: Alexander Lobakin <alexandr.lobakin@intel.com> Cc: Magnus Karlsson <magnus.karlsson@gmail.com> Cc: Maryam Tahhan <mtahhan@redhat.com> Cc: xdp-hints@xdp-project.net Cc: netdev@vger.kernel.org Signed-off-by: Stanislav Fomichev <sdf@google.com> Link: https://lore.kernel.org/r/20230119221536.3349901-12-sdf@google.com Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
2023-01-20 06:15:30 +08:00
__u32 rx_hash;
selftests/bpf: Adjust bpf_xdp_metadata_rx_hash for new arg Update BPF selftests to use the new RSS type argument for kfunc bpf_xdp_metadata_rx_hash. Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Acked-by: Toke Høiland-Jørgensen <toke@redhat.com> Acked-by: Stanislav Fomichev <sdf@google.com> Link: https://lore.kernel.org/r/168132894068.340624.8914711185697163690.stgit@firesoul Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2023-04-13 03:49:00 +08:00
union {
__u32 rx_hash_type;
__s32 rx_hash_err;
};
selftests/bpf: Verify xdp_metadata xdp->af_xdp path - create new netns - create veth pair (veTX+veRX) - setup AF_XDP socket for both interfaces - attach bpf to veRX - send packet via veTX - verify the packet has expected metadata at veRX Cc: John Fastabend <john.fastabend@gmail.com> Cc: David Ahern <dsahern@gmail.com> Cc: Martin KaFai Lau <martin.lau@linux.dev> Cc: Jakub Kicinski <kuba@kernel.org> Cc: Willem de Bruijn <willemb@google.com> Cc: Jesper Dangaard Brouer <brouer@redhat.com> Cc: Anatoly Burakov <anatoly.burakov@intel.com> Cc: Alexander Lobakin <alexandr.lobakin@intel.com> Cc: Magnus Karlsson <magnus.karlsson@gmail.com> Cc: Maryam Tahhan <mtahhan@redhat.com> Cc: xdp-hints@xdp-project.net Cc: netdev@vger.kernel.org Signed-off-by: Stanislav Fomichev <sdf@google.com> Link: https://lore.kernel.org/r/20230119221536.3349901-12-sdf@google.com Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
2023-01-20 06:15:30 +08:00
};
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