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bpf: Add support for absolute value BPF timers

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Add a new flag BPF_F_TIMER_ABS that can be passed to bpf_timer_start()
to start an absolute value timer instead of the default relative value.
This makes the timer expire at an exact point in time, instead of a time
with latencies induced by both the BPF and timer subsystems.

Suggested-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: Tero Kristo <tero.kristo@linux.intel.com>
Link: https://lore.kernel.org/r/20230302114614.2985072-2-tero.kristo@linux.intel.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Tero Kristo
2023-03-02 13:46:13 +02:00
committed by Alexei Starovoitov
parent ec97a76f11
commit f71f853049
3 changed files with 39 additions and 2 deletions
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15
include/uapi/linux/bpf.h
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@@ -4969,6 +4969,12 @@ union bpf_attr {
* different maps if key/value layout matches across maps.
* Every bpf_timer_set_callback() can have different callback_fn.
*
* *flags* can be one of:
*
* **BPF_F_TIMER_ABS**
* Start the timer in absolute expire value instead of the
* default relative one.
*
* Return
* 0 on success.
* **-EINVAL** if *timer* was not initialized with bpf_timer_init() earlier
@@ -7097,4 +7103,13 @@ struct bpf_core_relo {
enum bpf_core_relo_kind kind;
};
/*
* Flags to control bpf_timer_start() behaviour.
* - BPF_F_TIMER_ABS: Timeout passed is absolute time, by default it is
* relative to current time.
*/
enum {
BPF_F_TIMER_ABS = (1ULL << 0),
};
#endif /* _UAPI__LINUX_BPF_H__ */