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authorMaciej Żenczykowski <maze@google.com>2020-04-26 09:15:25 -0700
committerAlexei Starovoitov <ast@kernel.org>2020-04-26 09:43:05 -0700
commit71d19214776e61b33da48f7c1b46e522c7f78221 (patch)
tree424b2ecd19cc56edb46333e2a2773cd062bdaf82 /tools/include
parent0a05861f80fe7d4dcfdabcc98d9854947573e072 (diff)
downloadlinux-71d19214776e61b33da48f7c1b46e522c7f78221.tar.bz2
bpf: add bpf_ktime_get_boot_ns()
On a device like a cellphone which is constantly suspending and resuming CLOCK_MONOTONIC is not particularly useful for keeping track of or reacting to external network events. Instead you want to use CLOCK_BOOTTIME. Hence add bpf_ktime_get_boot_ns() as a mirror of bpf_ktime_get_ns() based around CLOCK_BOOTTIME instead of CLOCK_MONOTONIC. Signed-off-by: Maciej Żenczykowski <maze@google.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'tools/include')
-rw-r--r--tools/include/uapi/linux/bpf.h13
1 files changed, 12 insertions, 1 deletions
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index 7bbf1b65be10..4a6c47f3febe 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -652,6 +652,8 @@ union bpf_attr {
* u64 bpf_ktime_get_ns(void)
* Description
* Return the time elapsed since system boot, in nanoseconds.
+ * Does not include time the system was suspended.
+ * See: clock_gettime(CLOCK_MONOTONIC)
* Return
* Current *ktime*.
*
@@ -3025,6 +3027,14 @@ union bpf_attr {
* * **-EOPNOTSUPP** Unsupported operation, for example a
* call from outside of TC ingress.
* * **-ESOCKTNOSUPPORT** Socket type not supported (reuseport).
+ *
+ * u64 bpf_ktime_get_boot_ns(void)
+ * Description
+ * Return the time elapsed since system boot, in nanoseconds.
+ * Does include the time the system was suspended.
+ * See: clock_gettime(CLOCK_BOOTTIME)
+ * Return
+ * Current *ktime*.
*/
#define __BPF_FUNC_MAPPER(FN) \
FN(unspec), \
@@ -3151,7 +3161,8 @@ union bpf_attr {
FN(xdp_output), \
FN(get_netns_cookie), \
FN(get_current_ancestor_cgroup_id), \
- FN(sk_assign),
+ FN(sk_assign), \
+ FN(ktime_get_boot_ns),
/* integer value in 'imm' field of BPF_CALL instruction selects which helper
* function eBPF program intends to call