diff options
| author |   Joe Stringer <joe@cilium.io> | 2021-03-02 09:19:35 -0800 |
|---|---|---|
| committer |   Alexei Starovoitov <ast@kernel.org> | 2021-03-04 18:39:44 -0800 |
| commit | 6690523bccb3e44cfcc4b2c995767e6814046e34 (patch) | |
| tree | 3f6b0af4480522843b48a825a25e17ab8751630b /include | |
| parent | bpf: Add minimal bpf() command documentation (diff) | |
| download | linux-dev-6690523bccb3e44cfcc4b2c995767e6814046e34.tar.xz linux-dev-6690523bccb3e44cfcc4b2c995767e6814046e34.zip | |
bpf: Document BPF_F_LOCK in syscall commands
Document the meaning of the BPF_F_LOCK flag for the map lookup/update
descriptions. Based on commit 96049f3afd50 ("bpf: introduce BPF_F_LOCK
flag").
Signed-off-by: Joe Stringer <joe@cilium.io>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Reviewed-by: Quentin Monnet <quentin@isovalent.com>
Acked-by: Toke Høiland-Jørgensen <toke@redhat.com>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20210302171947.2268128-4-joe@cilium.io
Diffstat (limited to 'include')
| -rw-r--r-- | include/uapi/linux/bpf.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 052bbfe65f77..eb9f059f0569 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -123,6 +123,14 @@ union bpf_iter_link_info { * Look up an element with a given *key* in the map referred to * by the file descriptor *map_fd*. * + * The *flags* argument may be specified as one of the + * following: + * + * **BPF_F_LOCK** + * Look up the value of a spin-locked map without + * returning the lock. This must be specified if the + * elements contain a spinlock. + * * Return * Returns zero on success. On error, -1 is returned and *errno* * is set appropriately. @@ -140,6 +148,8 @@ union bpf_iter_link_info { * Create a new element only if it did not exist. * **BPF_EXIST** * Update an existing element. + * **BPF_F_LOCK** + * Update a spin_lock-ed map element. * * Return * Returns zero on success. On error, -1 is returned and *errno* |