64069c72b4
Add user facing __contains macro which provides a convenient wrapper over the verbose kernel specific BTF declaration tag required to annotate BPF list head structs in user types. Acked-by: Dave Marchevsky <davemarchevsky@fb.com> Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Link: https://lore.kernel.org/r/20221118015614.2013203-20-memxor@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
69 lines
2.2 KiB
C
69 lines
2.2 KiB
C
#ifndef __BPF_EXPERIMENTAL__
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#define __BPF_EXPERIMENTAL__
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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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#define __contains(name, node) __attribute__((btf_decl_tag("contains:" #name ":" #node)))
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/* Description
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* Allocates an object of the type represented by 'local_type_id' in
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* program BTF. User may use the bpf_core_type_id_local macro to pass the
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* type ID of a struct in program BTF.
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*
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* The 'local_type_id' parameter must be a known constant.
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* The 'meta' parameter is a hidden argument that is ignored.
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* Returns
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* A pointer to an object of the type corresponding to the passed in
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* 'local_type_id', or NULL on failure.
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*/
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extern void *bpf_obj_new_impl(__u64 local_type_id, void *meta) __ksym;
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/* Convenience macro to wrap over bpf_obj_new_impl */
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#define bpf_obj_new(type) ((type *)bpf_obj_new_impl(bpf_core_type_id_local(type), NULL))
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/* Description
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* Free an allocated object. All fields of the object that require
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* destruction will be destructed before the storage is freed.
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*
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* The 'meta' parameter is a hidden argument that is ignored.
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* Returns
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* Void.
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*/
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extern void bpf_obj_drop_impl(void *kptr, void *meta) __ksym;
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/* Convenience macro to wrap over bpf_obj_drop_impl */
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#define bpf_obj_drop(kptr) bpf_obj_drop_impl(kptr, NULL)
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/* Description
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* Add a new entry to the beginning of the BPF linked list.
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* Returns
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* Void.
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*/
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extern void bpf_list_push_front(struct bpf_list_head *head, struct bpf_list_node *node) __ksym;
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/* Description
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* Add a new entry to the end of the BPF linked list.
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* Returns
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* Void.
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*/
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extern void bpf_list_push_back(struct bpf_list_head *head, struct bpf_list_node *node) __ksym;
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/* Description
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* Remove the entry at the beginning of the BPF linked list.
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* Returns
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* Pointer to bpf_list_node of deleted entry, or NULL if list is empty.
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*/
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extern struct bpf_list_node *bpf_list_pop_front(struct bpf_list_head *head) __ksym;
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/* Description
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* Remove the entry at the end of the BPF linked list.
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* Returns
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* Pointer to bpf_list_node of deleted entry, or NULL if list is empty.
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*/
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extern struct bpf_list_node *bpf_list_pop_back(struct bpf_list_head *head) __ksym;
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#endif
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