36e04a2d78
Creating a bpf sample that shows howto use the XDP 'data_meta' infrastructure, created by Daniel Borkmann. Very few drivers support this feature, but I wanted a functional sample to begin with, when working on adding driver support. XDP data_meta is about creating a communication channel between BPF programs. This can be XDP tail-progs, but also other SKB based BPF hooks, like in this case the TC clsact hook. In this sample I show that XDP can store info named "mark", and TC/clsact chooses to use this info and store it into the skb->mark. It is a bit annoying that XDP and TC samples uses different tools/libs when attaching their BPF hooks. As the XDP and TC programs need to cooperate and agree on a struct-layout, it is best/easiest if the two programs can be contained within the same BPF restricted-C file. As the bpf-loader, I choose to not use bpf_load.c (or libbpf), but instead wrote a bash shell scripted named xdp2skb_meta.sh, which demonstrate howto use the iproute cmdline tools 'tc' and 'ip' for loading BPF programs. To make it easy for first time users, the shell script have command line parsing, and support --verbose and --dry-run mode, if you just want to see/learn the tc+ip command syntax: # ./xdp2skb_meta.sh --dev ixgbe2 --dry-run # Dry-run mode: enable VERBOSE and don't call TC+IP tc qdisc del dev ixgbe2 clsact tc qdisc add dev ixgbe2 clsact tc filter add dev ixgbe2 ingress prio 1 handle 1 bpf da obj ./xdp2skb_meta_kern.o sec tc_mark # Flush XDP on device: ixgbe2 ip link set dev ixgbe2 xdp off ip link set dev ixgbe2 xdp obj ./xdp2skb_meta_kern.o sec xdp_mark Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
256 lines
8.9 KiB
Makefile
256 lines
8.9 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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# List of programs to build
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hostprogs-y := test_lru_dist
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hostprogs-y += sock_example
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hostprogs-y += fds_example
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hostprogs-y += sockex1
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hostprogs-y += sockex2
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hostprogs-y += sockex3
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hostprogs-y += tracex1
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hostprogs-y += tracex2
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hostprogs-y += tracex3
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hostprogs-y += tracex4
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hostprogs-y += tracex5
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hostprogs-y += tracex6
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hostprogs-y += tracex7
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hostprogs-y += test_probe_write_user
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hostprogs-y += trace_output
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hostprogs-y += lathist
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hostprogs-y += offwaketime
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hostprogs-y += spintest
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hostprogs-y += map_perf_test
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hostprogs-y += test_overhead
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hostprogs-y += test_cgrp2_array_pin
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hostprogs-y += test_cgrp2_attach
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hostprogs-y += test_cgrp2_attach2
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hostprogs-y += test_cgrp2_sock
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hostprogs-y += test_cgrp2_sock2
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hostprogs-y += xdp1
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hostprogs-y += xdp2
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hostprogs-y += xdp_router_ipv4
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hostprogs-y += test_current_task_under_cgroup
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hostprogs-y += trace_event
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hostprogs-y += sampleip
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hostprogs-y += tc_l2_redirect
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hostprogs-y += lwt_len_hist
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hostprogs-y += xdp_tx_iptunnel
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hostprogs-y += test_map_in_map
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hostprogs-y += per_socket_stats_example
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hostprogs-y += load_sock_ops
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hostprogs-y += xdp_redirect
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hostprogs-y += xdp_redirect_map
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hostprogs-y += xdp_redirect_cpu
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hostprogs-y += xdp_monitor
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hostprogs-y += xdp_rxq_info
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hostprogs-y += syscall_tp
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# Libbpf dependencies
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LIBBPF := ../../tools/lib/bpf/bpf.o
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CGROUP_HELPERS := ../../tools/testing/selftests/bpf/cgroup_helpers.o
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test_lru_dist-objs := test_lru_dist.o $(LIBBPF)
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sock_example-objs := sock_example.o $(LIBBPF)
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fds_example-objs := bpf_load.o $(LIBBPF) fds_example.o
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sockex1-objs := bpf_load.o $(LIBBPF) sockex1_user.o
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sockex2-objs := bpf_load.o $(LIBBPF) sockex2_user.o
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sockex3-objs := bpf_load.o $(LIBBPF) sockex3_user.o
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tracex1-objs := bpf_load.o $(LIBBPF) tracex1_user.o
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tracex2-objs := bpf_load.o $(LIBBPF) tracex2_user.o
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tracex3-objs := bpf_load.o $(LIBBPF) tracex3_user.o
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tracex4-objs := bpf_load.o $(LIBBPF) tracex4_user.o
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tracex5-objs := bpf_load.o $(LIBBPF) tracex5_user.o
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tracex6-objs := bpf_load.o $(LIBBPF) tracex6_user.o
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tracex7-objs := bpf_load.o $(LIBBPF) tracex7_user.o
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load_sock_ops-objs := bpf_load.o $(LIBBPF) load_sock_ops.o
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test_probe_write_user-objs := bpf_load.o $(LIBBPF) test_probe_write_user_user.o
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trace_output-objs := bpf_load.o $(LIBBPF) trace_output_user.o
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lathist-objs := bpf_load.o $(LIBBPF) lathist_user.o
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offwaketime-objs := bpf_load.o $(LIBBPF) offwaketime_user.o
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spintest-objs := bpf_load.o $(LIBBPF) spintest_user.o
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map_perf_test-objs := bpf_load.o $(LIBBPF) map_perf_test_user.o
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test_overhead-objs := bpf_load.o $(LIBBPF) test_overhead_user.o
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test_cgrp2_array_pin-objs := $(LIBBPF) test_cgrp2_array_pin.o
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test_cgrp2_attach-objs := $(LIBBPF) test_cgrp2_attach.o
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test_cgrp2_attach2-objs := $(LIBBPF) test_cgrp2_attach2.o $(CGROUP_HELPERS)
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test_cgrp2_sock-objs := $(LIBBPF) test_cgrp2_sock.o
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test_cgrp2_sock2-objs := bpf_load.o $(LIBBPF) test_cgrp2_sock2.o
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xdp1-objs := bpf_load.o $(LIBBPF) xdp1_user.o
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# reuse xdp1 source intentionally
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xdp2-objs := bpf_load.o $(LIBBPF) xdp1_user.o
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xdp_router_ipv4-objs := bpf_load.o $(LIBBPF) xdp_router_ipv4_user.o
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test_current_task_under_cgroup-objs := bpf_load.o $(LIBBPF) $(CGROUP_HELPERS) \
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test_current_task_under_cgroup_user.o
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trace_event-objs := bpf_load.o $(LIBBPF) trace_event_user.o
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sampleip-objs := bpf_load.o $(LIBBPF) sampleip_user.o
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tc_l2_redirect-objs := bpf_load.o $(LIBBPF) tc_l2_redirect_user.o
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lwt_len_hist-objs := bpf_load.o $(LIBBPF) lwt_len_hist_user.o
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xdp_tx_iptunnel-objs := bpf_load.o $(LIBBPF) xdp_tx_iptunnel_user.o
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test_map_in_map-objs := bpf_load.o $(LIBBPF) test_map_in_map_user.o
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per_socket_stats_example-objs := $(LIBBPF) cookie_uid_helper_example.o
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xdp_redirect-objs := bpf_load.o $(LIBBPF) xdp_redirect_user.o
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xdp_redirect_map-objs := bpf_load.o $(LIBBPF) xdp_redirect_map_user.o
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xdp_redirect_cpu-objs := bpf_load.o $(LIBBPF) xdp_redirect_cpu_user.o
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xdp_monitor-objs := bpf_load.o $(LIBBPF) xdp_monitor_user.o
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xdp_rxq_info-objs := bpf_load.o $(LIBBPF) xdp_rxq_info_user.o
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syscall_tp-objs := bpf_load.o $(LIBBPF) syscall_tp_user.o
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# Tell kbuild to always build the programs
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always := $(hostprogs-y)
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always += sockex1_kern.o
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always += sockex2_kern.o
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always += sockex3_kern.o
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always += tracex1_kern.o
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always += tracex2_kern.o
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always += tracex3_kern.o
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always += tracex4_kern.o
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always += tracex5_kern.o
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always += tracex6_kern.o
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always += tracex7_kern.o
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always += sock_flags_kern.o
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always += test_probe_write_user_kern.o
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always += trace_output_kern.o
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always += tcbpf1_kern.o
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always += tcbpf2_kern.o
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always += tc_l2_redirect_kern.o
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always += lathist_kern.o
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always += offwaketime_kern.o
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always += spintest_kern.o
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always += map_perf_test_kern.o
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always += test_overhead_tp_kern.o
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always += test_overhead_kprobe_kern.o
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always += parse_varlen.o parse_simple.o parse_ldabs.o
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always += test_cgrp2_tc_kern.o
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always += xdp1_kern.o
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always += xdp2_kern.o
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always += xdp_router_ipv4_kern.o
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always += test_current_task_under_cgroup_kern.o
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always += trace_event_kern.o
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always += sampleip_kern.o
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always += lwt_len_hist_kern.o
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always += xdp_tx_iptunnel_kern.o
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always += test_map_in_map_kern.o
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always += cookie_uid_helper_example.o
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always += tcp_synrto_kern.o
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always += tcp_rwnd_kern.o
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always += tcp_bufs_kern.o
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always += tcp_cong_kern.o
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always += tcp_iw_kern.o
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always += tcp_clamp_kern.o
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always += tcp_basertt_kern.o
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always += xdp_redirect_kern.o
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always += xdp_redirect_map_kern.o
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always += xdp_redirect_cpu_kern.o
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always += xdp_monitor_kern.o
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always += xdp_rxq_info_kern.o
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always += xdp2skb_meta_kern.o
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always += syscall_tp_kern.o
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HOSTCFLAGS += -I$(objtree)/usr/include
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HOSTCFLAGS += -I$(srctree)/tools/lib/
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HOSTCFLAGS += -I$(srctree)/tools/testing/selftests/bpf/
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HOSTCFLAGS += -I$(srctree)/tools/lib/ -I$(srctree)/tools/include
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HOSTCFLAGS += -I$(srctree)/tools/perf
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HOSTCFLAGS_bpf_load.o += -I$(objtree)/usr/include -Wno-unused-variable
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HOSTLOADLIBES_fds_example += -lelf
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HOSTLOADLIBES_sockex1 += -lelf
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HOSTLOADLIBES_sockex2 += -lelf
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HOSTLOADLIBES_sockex3 += -lelf
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HOSTLOADLIBES_tracex1 += -lelf
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HOSTLOADLIBES_tracex2 += -lelf
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HOSTLOADLIBES_tracex3 += -lelf
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HOSTLOADLIBES_tracex4 += -lelf -lrt
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HOSTLOADLIBES_tracex5 += -lelf
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HOSTLOADLIBES_tracex6 += -lelf
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HOSTLOADLIBES_tracex7 += -lelf
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HOSTLOADLIBES_test_cgrp2_sock2 += -lelf
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HOSTLOADLIBES_load_sock_ops += -lelf
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HOSTLOADLIBES_test_probe_write_user += -lelf
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HOSTLOADLIBES_trace_output += -lelf -lrt
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HOSTLOADLIBES_lathist += -lelf
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HOSTLOADLIBES_offwaketime += -lelf
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HOSTLOADLIBES_spintest += -lelf
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HOSTLOADLIBES_map_perf_test += -lelf -lrt
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HOSTLOADLIBES_test_overhead += -lelf -lrt
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HOSTLOADLIBES_xdp1 += -lelf
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HOSTLOADLIBES_xdp2 += -lelf
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HOSTLOADLIBES_xdp_router_ipv4 += -lelf
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HOSTLOADLIBES_test_current_task_under_cgroup += -lelf
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HOSTLOADLIBES_trace_event += -lelf
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HOSTLOADLIBES_sampleip += -lelf
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HOSTLOADLIBES_tc_l2_redirect += -l elf
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HOSTLOADLIBES_lwt_len_hist += -l elf
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HOSTLOADLIBES_xdp_tx_iptunnel += -lelf
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HOSTLOADLIBES_test_map_in_map += -lelf
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HOSTLOADLIBES_xdp_redirect += -lelf
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HOSTLOADLIBES_xdp_redirect_map += -lelf
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HOSTLOADLIBES_xdp_redirect_cpu += -lelf
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HOSTLOADLIBES_xdp_monitor += -lelf
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HOSTLOADLIBES_xdp_rxq_info += -lelf
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HOSTLOADLIBES_syscall_tp += -lelf
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# Allows pointing LLC/CLANG to a LLVM backend with bpf support, redefine on cmdline:
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# make samples/bpf/ LLC=~/git/llvm/build/bin/llc CLANG=~/git/llvm/build/bin/clang
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LLC ?= llc
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CLANG ?= clang
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# Detect that we're cross compiling and use the cross compiler
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ifdef CROSS_COMPILE
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HOSTCC = $(CROSS_COMPILE)gcc
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CLANG_ARCH_ARGS = -target $(ARCH)
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endif
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# Trick to allow make to be run from this directory
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all:
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$(MAKE) -C ../../ $(CURDIR)/
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clean:
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$(MAKE) -C ../../ M=$(CURDIR) clean
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@rm -f *~
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$(obj)/syscall_nrs.s: $(src)/syscall_nrs.c
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$(call if_changed_dep,cc_s_c)
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$(obj)/syscall_nrs.h: $(obj)/syscall_nrs.s FORCE
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$(call filechk,offsets,__SYSCALL_NRS_H__)
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clean-files += syscall_nrs.h
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FORCE:
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# Verify LLVM compiler tools are available and bpf target is supported by llc
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.PHONY: verify_cmds verify_target_bpf $(CLANG) $(LLC)
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verify_cmds: $(CLANG) $(LLC)
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@for TOOL in $^ ; do \
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if ! (which -- "$${TOOL}" > /dev/null 2>&1); then \
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echo "*** ERROR: Cannot find LLVM tool $${TOOL}" ;\
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exit 1; \
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else true; fi; \
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done
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verify_target_bpf: verify_cmds
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@if ! (${LLC} -march=bpf -mattr=help > /dev/null 2>&1); then \
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echo "*** ERROR: LLVM (${LLC}) does not support 'bpf' target" ;\
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echo " NOTICE: LLVM version >= 3.7.1 required" ;\
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exit 2; \
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else true; fi
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$(src)/*.c: verify_target_bpf
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$(obj)/tracex5_kern.o: $(obj)/syscall_nrs.h
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# asm/sysreg.h - inline assembly used by it is incompatible with llvm.
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# But, there is no easy way to fix it, so just exclude it since it is
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# useless for BPF samples.
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$(obj)/%.o: $(src)/%.c
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$(CLANG) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(EXTRA_CFLAGS) -I$(obj) \
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-I$(srctree)/tools/testing/selftests/bpf/ \
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-D__KERNEL__ -Wno-unused-value -Wno-pointer-sign \
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-D__TARGET_ARCH_$(ARCH) -Wno-compare-distinct-pointer-types \
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-Wno-gnu-variable-sized-type-not-at-end \
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-Wno-address-of-packed-member -Wno-tautological-compare \
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-Wno-unknown-warning-option $(CLANG_ARCH_ARGS) \
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-O2 -emit-llvm -c $< -o -| $(LLC) -march=bpf -filetype=obj -o $@
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