108 lines
2.2 KiB
C
108 lines
2.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */
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#include <vmlinux.h>
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#include <bpf/bpf_tracing.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_core_read.h>
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#include "../bpf_experimental.h"
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#include "../bpf_testmod/bpf_testmod_kfunc.h"
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struct node_data {
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long key;
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long data;
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struct bpf_rb_node node;
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};
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struct map_value {
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struct prog_test_ref_kfunc *not_kptr;
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struct prog_test_ref_kfunc __kptr *val;
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struct node_data __kptr *node;
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};
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/* This is necessary so that LLVM generates BTF for node_data struct
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* If it's not included, a fwd reference for node_data will be generated but
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* no struct. Example BTF of "node" field in map_value when not included:
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*
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* [10] PTR '(anon)' type_id=35
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* [34] FWD 'node_data' fwd_kind=struct
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* [35] TYPE_TAG 'kptr_ref' type_id=34
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*
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* (with no node_data struct defined)
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* Had to do the same w/ bpf_kfunc_call_test_release below
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*/
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struct node_data *just_here_because_btf_bug;
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struct {
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__uint(type, BPF_MAP_TYPE_ARRAY);
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__type(key, int);
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__type(value, struct map_value);
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__uint(max_entries, 2);
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} some_nodes SEC(".maps");
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static int create_and_stash(int idx, int val)
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{
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struct map_value *mapval;
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struct node_data *res;
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mapval = bpf_map_lookup_elem(&some_nodes, &idx);
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if (!mapval)
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return 1;
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res = bpf_obj_new(typeof(*res));
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if (!res)
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return 1;
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res->key = val;
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res = bpf_kptr_xchg(&mapval->node, res);
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if (res)
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bpf_obj_drop(res);
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return 0;
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}
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SEC("tc")
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long stash_rb_nodes(void *ctx)
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{
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return create_and_stash(0, 41) ?: create_and_stash(1, 42);
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}
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SEC("tc")
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long unstash_rb_node(void *ctx)
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{
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struct map_value *mapval;
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struct node_data *res;
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long retval;
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int key = 1;
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mapval = bpf_map_lookup_elem(&some_nodes, &key);
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if (!mapval)
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return 1;
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res = bpf_kptr_xchg(&mapval->node, NULL);
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if (res) {
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retval = res->key;
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bpf_obj_drop(res);
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return retval;
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}
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return 1;
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}
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SEC("tc")
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long stash_test_ref_kfunc(void *ctx)
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{
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struct prog_test_ref_kfunc *res;
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struct map_value *mapval;
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int key = 0;
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mapval = bpf_map_lookup_elem(&some_nodes, &key);
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if (!mapval)
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return 1;
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res = bpf_kptr_xchg(&mapval->val, NULL);
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if (res)
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bpf_kfunc_call_test_release(res);
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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