samples: bpf: remove load_sock_ops in favour of bpftool (ea9b6362) · Commits · 方亚芬 / raspberrypi_linux

samples/bpf/.gitignore

+0 −1

Original line number	Diff line number	Diff line
		cpustat
		fds_example
		lathist
		load_sock_ops
		lwt_len_hist
		map_perf_test
		offwaketime

samples/bpf/Makefile

+0 −2

Original line number	Diff line number	Diff line
		@@ -40,7 +40,6 @@ hostprogs-y += lwt_len_hist
		hostprogs-y += xdp_tx_iptunnel
		hostprogs-y += test_map_in_map
		hostprogs-y += per_socket_stats_example
		hostprogs-y += load_sock_ops
		hostprogs-y += xdp_redirect
		hostprogs-y += xdp_redirect_map
		hostprogs-y += xdp_redirect_cpu
		@@ -71,7 +70,6 @@ tracex4-objs := bpf_load.o tracex4_user.o
		tracex5-objs := bpf_load.o tracex5_user.o
		tracex6-objs := bpf_load.o tracex6_user.o
		tracex7-objs := bpf_load.o tracex7_user.o
		load_sock_ops-objs := bpf_load.o load_sock_ops.o
		test_probe_write_user-objs := bpf_load.o test_probe_write_user_user.o
		trace_output-objs := bpf_load.o trace_output_user.o $(TRACE_HELPERS)
		lathist-objs := bpf_load.o lathist_user.o

samples/bpf/load_sock_ops.c

deleted100644 → 0

+0 −97

Original line number	Diff line number	Diff line
		/* Copyright (c) 2017 Facebook
		*
		* This program is free software; you can redistribute it and/or
		* modify it under the terms of version 2 of the GNU General Public
		* License as published by the Free Software Foundation.
		*/
		#include <stdio.h>
		#include <stdlib.h>
		#include <string.h>
		#include <linux/bpf.h>
		#include <bpf/bpf.h>
		#include "bpf_load.h"
		#include <unistd.h>
		#include <errno.h>
		#include <fcntl.h>
		#include <linux/unistd.h>

		static void usage(char *pname)
		{
		printf("USAGE:\n %s [-l] <cg-path> <prog filename>\n", pname);
		printf("\tLoad and attach a sock_ops program to the specified "
		"cgroup\n");
		printf("\tIf \"-l\" is used, the program will continue to run\n");
		printf("\tprinting the BPF log buffer\n");
		printf("\tIf the specified filename does not end in \".o\", it\n");
		printf("\tappends \"_kern.o\" to the name\n");
		printf("\n");
		printf(" %s -r <cg-path>\n", pname);
		printf("\tDetaches the currently attached sock_ops program\n");
		printf("\tfrom the specified cgroup\n");
		printf("\n");
		exit(1);
		}

		int main(int argc, char **argv)
		{
		int logFlag = 0;
		int error = 0;
		char *cg_path;
		char fn[500];
		char *prog;
		int cg_fd;

		if (argc < 3)
		usage(argv[0]);

		if (!strcmp(argv[1], "-r")) {
		cg_path = argv[2];
		cg_fd = open(cg_path, O_DIRECTORY, O_RDONLY);
		error = bpf_prog_detach(cg_fd, BPF_CGROUP_SOCK_OPS);
		if (error) {
		printf("ERROR: bpf_prog_detach: %d (%s)\n",
		error, strerror(errno));
		return 2;
		}
		return 0;
		} else if (!strcmp(argv[1], "-h")) {
		usage(argv[0]);
		} else if (!strcmp(argv[1], "-l")) {
		logFlag = 1;
		if (argc < 4)
		usage(argv[0]);
		}

		prog = argv[argc - 1];
		cg_path = argv[argc - 2];
		if (strlen(prog) > 480) {
		fprintf(stderr, "ERROR: program name too long (> 480 chars)\n");
		return 3;
		}
		cg_fd = open(cg_path, O_DIRECTORY, O_RDONLY);

		if (!strcmp(prog + strlen(prog)-2, ".o"))
		strcpy(fn, prog);
		else
		sprintf(fn, "%s_kern.o", prog);
		if (logFlag)
		printf("loading bpf file:%s\n", fn);
		if (load_bpf_file(fn)) {
		printf("ERROR: load_bpf_file failed for: %s\n", fn);
		printf("%s", bpf_log_buf);
		return 4;
		}
		if (logFlag)
		printf("TCP BPF Loaded %s\n", fn);

		error = bpf_prog_attach(prog_fd[0], cg_fd, BPF_CGROUP_SOCK_OPS, 0);
		if (error) {
		printf("ERROR: bpf_prog_attach: %d (%s)\n",
		error, strerror(errno));
		return 5;
		} else if (logFlag) {
		read_trace_pipe();
		}

		return error;
		}

samples/bpf/tcp_basertt_kern.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -7,7 +7,7 @@
		* BPF program to set base_rtt to 80us when host is running TCP-NV and
		* both hosts are in the same datacenter (as determined by IPv6 prefix).
		*
		* Use load_sock_ops to load this BPF program.
		* Use "bpftool cgroup attach $cg sock_ops $prog" to load this BPF program.
		*/

		#include <uapi/linux/bpf.h>

samples/bpf/tcp_bpf.readme

+8 −6

Original line number	Diff line number	Diff line
		@@ -8,14 +8,16 @@ a cgroupv2 and attach a bash shell to the group.
		bash
		echo $$ >> /tmp/cgroupv2/foo/cgroup.procs

		Anything that runs under this shell belongs to the foo cgroupv2 To load
		Anything that runs under this shell belongs to the foo cgroupv2. To load
		(attach) one of the tcp_*_kern.o programs:

		./load_sock_ops -l /tmp/cgroupv2/foo tcp_basertt_kern.o
		bpftool prog load tcp_basertt_kern.o /sys/fs/bpf/tcp_prog
		bpftool cgroup attach /tmp/cgroupv2/foo sock_ops pinned /sys/fs/bpf/tcp_prog
		bpftool prog tracelog

		If the "-l" flag is used, the load_sock_ops program will continue to run
		printing the BPF log buffer. The tcp_*_kern.o programs use special print
		functions to print logging information (if enabled by the ifdef).
		"bpftool prog tracelog" will continue to run printing the BPF log buffer.
		The tcp_*_kern.o programs use special print functions to print logging
		information (if enabled by the ifdef).

		If using netperf/netserver to create traffic, you need to run them under the
		cgroupv2 to which the BPF programs are attached (i.e. under bash shell
		@@ -23,4 +25,4 @@ attached to the cgroupv2).

		To remove (unattach) a socket_ops BPF program from a cgroupv2:

		./load_sock_ops -r /tmp/cgroupv2/foo
		bpftool cgroup attach /tmp/cgroupv2/foo sock_ops pinned /sys/fs/bpf/tcp_prog