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| author |   Martin KaFai Lau <kafai@fb.com> | 2020-01-22 15:36:46 -0800 |
|---|---|---|
| committer |   Alexei Starovoitov <ast@kernel.org> | 2020-01-22 16:30:10 -0800 |
| commit | 5576b991e9c1a11d2cc21c4b94fc75ec27603896 (patch) | |
| tree | 6254c1eec41a9c3e2108eb955920573d61f8c19b /kernel/bpf/helpers.c | |
| parent | Merge branch 'bpf-dynamic-relinking' (diff) | |
| download | wireguard-linux-5576b991e9c1a11d2cc21c4b94fc75ec27603896.tar.xz wireguard-linux-5576b991e9c1a11d2cc21c4b94fc75ec27603896.zip | |
bpf: Add BPF_FUNC_jiffies64
This patch adds a helper to read the 64bit jiffies. It will be used
in a later patch to implement the bpf_cubic.c.
The helper is inlined for jit_requested and 64 BITS_PER_LONG
as the map_gen_lookup(). Other cases could be considered together
with map_gen_lookup() if needed.
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200122233646.903260-1-kafai@fb.com
Diffstat (limited to 'kernel/bpf/helpers.c')
| -rw-r--r-- | kernel/bpf/helpers.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c index cada974c9f4e..d8b7b110a1c5 100644 --- a/kernel/bpf/helpers.c +++ b/kernel/bpf/helpers.c @@ -11,6 +11,7 @@ #include <linux/uidgid.h> #include <linux/filter.h> #include <linux/ctype.h> +#include <linux/jiffies.h> #include "../../lib/kstrtox.h" @@ -312,6 +313,17 @@ void copy_map_value_locked(struct bpf_map *map, void *dst, void *src, preempt_enable(); } +BPF_CALL_0(bpf_jiffies64) +{ + return get_jiffies_64(); +} + +const struct bpf_func_proto bpf_jiffies64_proto = { + .func = bpf_jiffies64, + .gpl_only = false, + .ret_type = RET_INTEGER, +}; + #ifdef CONFIG_CGROUPS BPF_CALL_0(bpf_get_current_cgroup_id) { |