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bpf: fix documentation for eBPF helpers
Another round of minor fixes for the documentation of the BPF helpers
located in the UAPI bpf.h header file. Changes include:
- Moving around description of some helpers, to keep the descriptions in
the same order as helpers are declared (bpf_map_push_elem(), leftover
from commit 90b1023f68 ("bpf: fix documentation for eBPF helpers"),
bpf_rc_keydown(), and bpf_skb_ancestor_cgroup_id()).
- Fixing typos ("contex" -> "context").
- Harmonising return types ("void* " -> "void *", "uint64_t" -> "u64").
- Addition of the "bpf_" prefix to bpf_get_storage().
- Light additions of RST markup on some keywords.
- Empty line deletion between description and return value for
bpf_tcp_sock().
- Edit for the description for bpf_skb_ecn_set_ce() (capital letters,
acronym expansion, no effect if ECT not set, more details on return
value).
Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Quentin Monnet
Alexei Starovoitov
parent
cd70182e8d
commit
62369db2df
@ -502,16 +502,6 @@ union bpf_attr {
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* Return
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* 0 on success, or a negative error in case of failure.
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*
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* int bpf_map_push_elem(struct bpf_map *map, const void *value, u64 flags)
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* Description
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* Push an element *value* in *map*. *flags* is one of:
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*
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* **BPF_EXIST**
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* If the queue/stack is full, the oldest element is removed to
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* make room for this.
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* Return
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* 0 on success, or a negative error in case of failure.
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*
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* int bpf_probe_read(void *dst, u32 size, const void *src)
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* Description
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* For tracing programs, safely attempt to read *size* bytes from
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@ -1435,14 +1425,14 @@ union bpf_attr {
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* u64 bpf_get_socket_cookie(struct bpf_sock_addr *ctx)
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* Description
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* Equivalent to bpf_get_socket_cookie() helper that accepts
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* *skb*, but gets socket from **struct bpf_sock_addr** contex.
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* *skb*, but gets socket from **struct bpf_sock_addr** context.
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* Return
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* A 8-byte long non-decreasing number.
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*
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* u64 bpf_get_socket_cookie(struct bpf_sock_ops *ctx)
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* Description
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* Equivalent to bpf_get_socket_cookie() helper that accepts
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* *skb*, but gets socket from **struct bpf_sock_ops** contex.
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* *skb*, but gets socket from **struct bpf_sock_ops** context.
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* Return
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* A 8-byte long non-decreasing number.
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*
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@ -2098,6 +2088,25 @@ union bpf_attr {
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* Return
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* 0 on success, or a negative error in case of failure.
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*
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* int bpf_rc_repeat(void *ctx)
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* Description
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* This helper is used in programs implementing IR decoding, to
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* report a successfully decoded repeat key message. This delays
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* the generation of a key up event for previously generated
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* key down event.
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*
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* Some IR protocols like NEC have a special IR message for
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* repeating last button, for when a button is held down.
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*
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* The *ctx* should point to the lirc sample as passed into
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* the program.
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*
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* This helper is only available is the kernel was compiled with
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* the **CONFIG_BPF_LIRC_MODE2** configuration option set to
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* "**y**".
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* Return
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* 0
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*
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* int bpf_rc_keydown(void *ctx, u32 protocol, u64 scancode, u32 toggle)
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* Description
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* This helper is used in programs implementing IR decoding, to
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@ -2124,26 +2133,7 @@ union bpf_attr {
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* Return
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* 0
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*
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* int bpf_rc_repeat(void *ctx)
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* Description
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* This helper is used in programs implementing IR decoding, to
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* report a successfully decoded repeat key message. This delays
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* the generation of a key up event for previously generated
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* key down event.
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*
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* Some IR protocols like NEC have a special IR message for
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* repeating last button, for when a button is held down.
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*
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* The *ctx* should point to the lirc sample as passed into
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* the program.
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*
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* This helper is only available is the kernel was compiled with
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* the **CONFIG_BPF_LIRC_MODE2** configuration option set to
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* "**y**".
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* Return
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* 0
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*
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* uint64_t bpf_skb_cgroup_id(struct sk_buff *skb)
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* u64 bpf_skb_cgroup_id(struct sk_buff *skb)
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* Description
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* Return the cgroup v2 id of the socket associated with the *skb*.
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* This is roughly similar to the **bpf_get_cgroup_classid**\ ()
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@ -2159,30 +2149,12 @@ union bpf_attr {
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* Return
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* The id is returned or 0 in case the id could not be retrieved.
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*
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* u64 bpf_skb_ancestor_cgroup_id(struct sk_buff *skb, int ancestor_level)
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* Description
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* Return id of cgroup v2 that is ancestor of cgroup associated
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* with the *skb* at the *ancestor_level*. The root cgroup is at
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* *ancestor_level* zero and each step down the hierarchy
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* increments the level. If *ancestor_level* == level of cgroup
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* associated with *skb*, then return value will be same as that
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* of **bpf_skb_cgroup_id**\ ().
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*
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* The helper is useful to implement policies based on cgroups
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* that are upper in hierarchy than immediate cgroup associated
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* with *skb*.
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*
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* The format of returned id and helper limitations are same as in
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* **bpf_skb_cgroup_id**\ ().
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* Return
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* The id is returned or 0 in case the id could not be retrieved.
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*
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* u64 bpf_get_current_cgroup_id(void)
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* Return
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* A 64-bit integer containing the current cgroup id based
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* on the cgroup within which the current task is running.
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*
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* void* get_local_storage(void *map, u64 flags)
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* void *bpf_get_local_storage(void *map, u64 flags)
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* Description
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* Get the pointer to the local storage area.
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* The type and the size of the local storage is defined
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@ -2209,6 +2181,24 @@ union bpf_attr {
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* Return
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* 0 on success, or a negative error in case of failure.
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*
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* u64 bpf_skb_ancestor_cgroup_id(struct sk_buff *skb, int ancestor_level)
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* Description
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* Return id of cgroup v2 that is ancestor of cgroup associated
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* with the *skb* at the *ancestor_level*. The root cgroup is at
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* *ancestor_level* zero and each step down the hierarchy
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* increments the level. If *ancestor_level* == level of cgroup
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* associated with *skb*, then return value will be same as that
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* of **bpf_skb_cgroup_id**\ ().
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*
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* The helper is useful to implement policies based on cgroups
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* that are upper in hierarchy than immediate cgroup associated
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* with *skb*.
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*
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* The format of returned id and helper limitations are same as in
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* **bpf_skb_cgroup_id**\ ().
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* Return
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* The id is returned or 0 in case the id could not be retrieved.
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*
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* struct bpf_sock *bpf_sk_lookup_tcp(void *ctx, struct bpf_sock_tuple *tuple, u32 tuple_size, u64 netns, u64 flags)
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* Description
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* Look for TCP socket matching *tuple*, optionally in a child
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@ -2289,6 +2279,16 @@ union bpf_attr {
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* Return
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* 0 on success, or a negative error in case of failure.
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*
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* int bpf_map_push_elem(struct bpf_map *map, const void *value, u64 flags)
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* Description
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* Push an element *value* in *map*. *flags* is one of:
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*
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* **BPF_EXIST**
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* If the queue/stack is full, the oldest element is
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* removed to make room for this.
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* Return
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* 0 on success, or a negative error in case of failure.
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*
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* int bpf_map_pop_elem(struct bpf_map *map, void *value)
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* Description
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* Pop an element from *map*.
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@ -2346,33 +2346,35 @@ union bpf_attr {
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* struct bpf_sock *bpf_sk_fullsock(struct bpf_sock *sk)
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* Description
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* This helper gets a **struct bpf_sock** pointer such
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* that all the fields in bpf_sock can be accessed.
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* that all the fields in this **bpf_sock** can be accessed.
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* Return
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* A **struct bpf_sock** pointer on success, or NULL in
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* A **struct bpf_sock** pointer on success, or **NULL** in
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* case of failure.
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*
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* struct bpf_tcp_sock *bpf_tcp_sock(struct bpf_sock *sk)
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* Description
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* This helper gets a **struct bpf_tcp_sock** pointer from a
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* **struct bpf_sock** pointer.
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*
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* Return
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* A **struct bpf_tcp_sock** pointer on success, or NULL in
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* A **struct bpf_tcp_sock** pointer on success, or **NULL** in
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* case of failure.
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*
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* int bpf_skb_ecn_set_ce(struct sk_buf *skb)
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* Description
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* Sets ECN of IP header to ce (congestion encountered) if
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* current value is ect (ECN capable). Works with IPv6 and IPv4.
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* Return
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* 1 if set, 0 if not set.
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* Description
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* Set ECN (Explicit Congestion Notification) field of IP header
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* to **CE** (Congestion Encountered) if current value is **ECT**
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* (ECN Capable Transport). Otherwise, do nothing. Works with IPv6
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* and IPv4.
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* Return
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* 1 if the **CE** flag is set (either by the current helper call
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* or because it was already present), 0 if it is not set.
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*
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* struct bpf_sock *bpf_get_listener_sock(struct bpf_sock *sk)
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* Description
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* Return a **struct bpf_sock** pointer in TCP_LISTEN state.
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* bpf_sk_release() is unnecessary and not allowed.
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* Return a **struct bpf_sock** pointer in **TCP_LISTEN** state.
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* **bpf_sk_release**\ () is unnecessary and not allowed.
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* Return
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* A **struct bpf_sock** pointer on success, or NULL in
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* A **struct bpf_sock** pointer on success, or **NULL** in
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* case of failure.
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*/
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#define __BPF_FUNC_MAPPER(FN) \
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