256eab48e7
In preparation of skipping emitting static variables in BPF skeletons, switch all current selftests uses of static variables to pass data between BPF and user-space to use global variables. All non-read-only `static volatile` variables become just plain global variables by dropping `static volatile` part. Read-only `static volatile const` variables, though, still require `volatile` modifier, otherwise compiler will ignore whatever values are set from user-space. Few static linker tests are using name-conflicting static variables to validate that static linker still properly handles static variables and doesn't trip up on name conflicts. Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20210507054119.270888-4-andrii@kernel.org
53 lines
1.0 KiB
C
53 lines
1.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2020 Facebook */
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#include "bpf_iter.h"
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#include <bpf/bpf_helpers.h>
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char _license[] SEC("license") = "GPL";
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__u32 map1_id = 0, map2_id = 0;
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__u32 map1_accessed = 0, map2_accessed = 0;
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__u64 map1_seqnum = 0, map2_seqnum1 = 0, map2_seqnum2 = 0;
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volatile const __u32 print_len;
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volatile const __u32 ret1;
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SEC("iter/bpf_map")
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int dump_bpf_map(struct bpf_iter__bpf_map *ctx)
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{
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struct seq_file *seq = ctx->meta->seq;
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struct bpf_map *map = ctx->map;
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__u64 seq_num;
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int i, ret = 0;
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if (map == (void *)0)
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return 0;
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/* only dump map1_id and map2_id */
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if (map->id != map1_id && map->id != map2_id)
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return 0;
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seq_num = ctx->meta->seq_num;
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if (map->id == map1_id) {
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map1_seqnum = seq_num;
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map1_accessed++;
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}
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if (map->id == map2_id) {
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if (map2_accessed == 0) {
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map2_seqnum1 = seq_num;
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if (ret1)
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ret = 1;
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} else {
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map2_seqnum2 = seq_num;
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}
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map2_accessed++;
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}
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/* fill seq_file buffer */
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for (i = 0; i < print_len; i++)
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bpf_seq_write(seq, &seq_num, sizeof(seq_num));
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return ret;
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}
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