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bpf: Add lookup_and_delete_elem support to hashtab

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Extend the existing bpf_map_lookup_and_delete_elem() functionality to
hashtab map types, in addition to stacks and queues.
Create a new hashtab bpf_map_ops function that does lookup and deletion
of the element under the same bucket lock and add the created map_ops to
bpf.h.

Signed-off-by: Denis Salopek <denis.salopek@sartura.hr>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/4d18480a3e990ffbf14751ddef0325eed3be2966.1620763117.git.denis.salopek@sartura.hr
This commit is contained in:
Denis Salopek
2021-05-11 23:00:04 +02:00
committed by Andrii Nakryiko
parent f9bceaa59c
commit 3e87f192b4
5 changed files with 156 additions and 4 deletions
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13
tools/include/uapi/linux/bpf.h
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@@ -527,6 +527,15 @@ union bpf_iter_link_info {
* Look up an element with the given *key* in the map referred to
* by the file descriptor *fd*, and if found, delete the element.
*
* For **BPF_MAP_TYPE_QUEUE** and **BPF_MAP_TYPE_STACK** map
* types, the *flags* argument needs to be set to 0, but for other
* map types, it may be specified as:
*
* **BPF_F_LOCK**
* Look up and delete the value of a spin-locked map
* without returning the lock. This must be specified if
* the elements contain a spinlock.
*
* The **BPF_MAP_TYPE_QUEUE** and **BPF_MAP_TYPE_STACK** map types
* implement this command as a "pop" operation, deleting the top
* element rather than one corresponding to *key*.
@@ -536,6 +545,10 @@ union bpf_iter_link_info {
* This command is only valid for the following map types:
* * **BPF_MAP_TYPE_QUEUE**
* * **BPF_MAP_TYPE_STACK**
* * **BPF_MAP_TYPE_HASH**
* * **BPF_MAP_TYPE_PERCPU_HASH**
* * **BPF_MAP_TYPE_LRU_HASH**
* * **BPF_MAP_TYPE_LRU_PERCPU_HASH**
*
* Return
* Returns zero on success. On error, -1 is returned and *errno*