From b5c80d310527223b93e4133ac2f4c8c063c70a98 Mon Sep 17 00:00:00 2001 From: Christian Poessinger Date: Fri, 18 Dec 2020 17:13:13 +0100 Subject: xdp: T2666: switch to example code provided by xdp-tutorial --- src/xdp/include/bpf_util.h | 61 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 61 insertions(+) create mode 100644 src/xdp/include/bpf_util.h (limited to 'src/xdp/include/bpf_util.h') diff --git a/src/xdp/include/bpf_util.h b/src/xdp/include/bpf_util.h new file mode 100644 index 000000000..e74b33e9d --- /dev/null +++ b/src/xdp/include/bpf_util.h @@ -0,0 +1,61 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copied from $(LINUX)/tools/testing/selftests/bpf/bpf_util.h */ +#ifndef __BPF_UTIL__ +#define __BPF_UTIL__ + +#include +#include +#include +#include + +static inline unsigned int bpf_num_possible_cpus(void) +{ + static const char *fcpu = "/sys/devices/system/cpu/possible"; + unsigned int start, end, possible_cpus = 0; + char buff[128]; + FILE *fp; + int n; + + fp = fopen(fcpu, "r"); + if (!fp) { + printf("Failed to open %s: '%s'!\n", fcpu, strerror(errno)); + exit(1); + } + + while (fgets(buff, sizeof(buff), fp)) { + n = sscanf(buff, "%u-%u", &start, &end); + if (n == 0) { + printf("Failed to retrieve # possible CPUs!\n"); + exit(1); + } else if (n == 1) { + end = start; + } + possible_cpus = start == 0 ? end + 1 : 0; + break; + } + fclose(fp); + + return possible_cpus; +} + +#define __bpf_percpu_val_align __attribute__((__aligned__(8))) + +#define BPF_DECLARE_PERCPU(type, name) \ + struct { type v; /* padding */ } __bpf_percpu_val_align \ + name[bpf_num_possible_cpus()] +#define bpf_percpu(name, cpu) name[(cpu)].v + +#ifndef ARRAY_SIZE +# define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) +#endif + +#ifndef sizeof_field +#define sizeof_field(TYPE, MEMBER) sizeof((((TYPE *)0)->MEMBER)) +#endif + +#ifndef offsetofend +#define offsetofend(TYPE, MEMBER) \ + (offsetof(TYPE, MEMBER) + sizeof_field(TYPE, MEMBER)) +#endif + +#endif /* __BPF_UTIL__ */ -- cgit v1.2.3