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  • Javier Honduvilla Coto's avatar
    Allow arbitrary hashtable increments. Fixes #1742 (#1897) · 230c9c00
    由 Javier Honduvilla Coto 创作于 
    * Allow arbitrary hashtable increments. Fixes #1742

Right now incrementing some datastructure's values like maps or histograms can
be done with some boilerplate[1] or with `increment` which increments a value
by 1.

This patch allows a second optional parameter to use as the increment.

- [1]:
```
u64 zero = 0, *val;
val = map.lookup_or_init(&key, &zero);
(*val) += inc;
```

Notes:
- Some lines in the documentation where changed because of trailing spaces
deletion
- The test is quite simple right now
- Will update the tools to use `increment` in another PR

* CR changes
    230c9c00
helpers.h 28.44 KiB
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R"********(
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/*
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 * Copyright (c) 2015 PLUMgrid, Inc.
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 *
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 * Licensed under the Apache License, Version 2.0 (the "License");
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 * you may not use this file except in compliance with the License.
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 * You may obtain a copy of the License at
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 *
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 * http://www.apache.org/licenses/LICENSE-2.0
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 *
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 * Unless required by applicable law or agreed to in writing, software
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 * distributed under the License is distributed on an "AS IS" BASIS,
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 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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 * See the License for the specific language governing permissions and
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 * limitations under the License.
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 */
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#ifndef __BPF_HELPERS_H
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#define __BPF_HELPERS_H
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#include <uapi/linux/bpf.h>
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#include <uapi/linux/if_packet.h>
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#include <linux/version.h>
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#include <linux/log2.h>
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#ifndef CONFIG_BPF_SYSCALL
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#error "CONFIG_BPF_SYSCALL is undefined, please check your .config or ask your Linux distro to enable this feature"
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#endif
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#ifdef PERF_MAX_STACK_DEPTH
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#define BPF_MAX_STACK_DEPTH PERF_MAX_STACK_DEPTH
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#else
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#define BPF_MAX_STACK_DEPTH 127
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#endif
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/* helper macro to place programs, maps, license in
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 * different sections in elf_bpf file. Section names
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 * are interpreted by elf_bpf loader
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 */
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#define SEC(NAME) __attribute__((section(NAME), used))
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// Changes to the macro require changes in BFrontendAction classes
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#define BPF_F_TABLE(_table_type, _key_type, _leaf_type, _name, _max_entries, _flags) \
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struct _name##_table_t { \
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  _key_type key; \
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  _leaf_type leaf; \
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  _leaf_type * (*lookup) (_key_type *); \
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  _leaf_type * (*lookup_or_init) (_key_type *, _leaf_type *); \
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  int (*update) (_key_type *, _leaf_type *); \
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  int (*insert) (_key_type *, _leaf_type *); \
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  int (*delete) (_key_type *); \
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  void (*call) (void *, int index); \
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  void (*increment) (_key_type, ...); \
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  int (*get_stackid) (void *, u64); \
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  u32 max_entries; \
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  int flags; \
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}; \
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__attribute__((section("maps/" _table_type))) \
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struct _name##_table_t _name = { .flags = (_flags), .max_entries = (_max_entries) }
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#define BPF_TABLE(_table_type, _key_type, _leaf_type, _name, _max_entries) \
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BPF_F_TABLE(_table_type, _key_type, _leaf_type, _name, _max_entries, 0)
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// define a table same as above but allow it to be referenced by other modules
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#define BPF_TABLE_PUBLIC(_table_type, _key_type, _leaf_type, _name, _max_entries) \
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BPF_TABLE(_table_type, _key_type, _leaf_type, _name, _max_entries); \
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__attribute__((section("maps/export"))) \
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struct _name##_table_t __##_name
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// Identifier for current CPU used in perf_submit and perf_read
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// Prefer BPF_F_CURRENT_CPU flag, falls back to call helper for older kernel