linux.git/tools/lib/bpf/ringbuf.c, branch v6.8

libbpf: Add ring__consume

2023-09-25T23:22:43+00:00

Add ring__consume to consume a single ringbuffer, analogous to
ring_buffer__consume.

Signed-off-by: Martin Kelly 
Signed-off-by: Andrii Nakryiko 
Link: https://lore.kernel.org/bpf/20230925215045.2375758-14-martin.kelly@crowdstrike.com

libbpf: Add ring__map_fd

2023-09-25T23:22:43+00:00

Add ring__map_fd to get the file descriptor underlying a given
ringbuffer.

Signed-off-by: Martin Kelly 
Signed-off-by: Andrii Nakryiko 
Link: https://lore.kernel.org/bpf/20230925215045.2375758-12-martin.kelly@crowdstrike.com

libbpf: Add ring__size

2023-09-25T23:22:43+00:00

Add ring__size to get the total size of a given ringbuffer.

Signed-off-by: Martin Kelly 
Signed-off-by: Andrii Nakryiko 
Link: https://lore.kernel.org/bpf/20230925215045.2375758-10-martin.kelly@crowdstrike.com

libbpf: Add ring__avail_data_size

2023-09-25T23:22:42+00:00

Add ring__avail_data_size for querying the currently available data in
the ringbuffer, similar to the BPF_RB_AVAIL_DATA flag in
bpf_ringbuf_query. This is racy during ongoing operations but is still
useful for overall information on how a ringbuffer is behaving.

Signed-off-by: Martin Kelly 
Signed-off-by: Andrii Nakryiko 
Link: https://lore.kernel.org/bpf/20230925215045.2375758-8-martin.kelly@crowdstrike.com

libbpf: Add ring__producer_pos, ring__consumer_pos

2023-09-25T23:22:42+00:00

Add APIs to get the producer and consumer position for a given
ringbuffer.

Signed-off-by: Martin Kelly 
Signed-off-by: Andrii Nakryiko 
Link: https://lore.kernel.org/bpf/20230925215045.2375758-6-martin.kelly@crowdstrike.com

libbpf: Add ring_buffer__ring

2023-09-25T23:22:42+00:00

Add a new function ring_buffer__ring, which exposes struct ring * to the
user, representing a single ringbuffer.

Signed-off-by: Martin Kelly 
Signed-off-by: Andrii Nakryiko 
Link: https://lore.kernel.org/bpf/20230925215045.2375758-4-martin.kelly@crowdstrike.com

libbpf: Switch rings to array of pointers

2023-09-25T23:22:42+00:00

Switch rb->rings to be an array of pointers instead of a contiguous
block. This allows for each ring pointer to be stable after
ring_buffer__add is called, which allows us to expose struct ring * to
the user without gotchas. Without this change, the realloc in
ring_buffer__add could invalidate a struct ring *, making it unsafe to
give to the user.

Signed-off-by: Martin Kelly 
Signed-off-by: Andrii Nakryiko 
Link: https://lore.kernel.org/bpf/20230925215045.2375758-3-martin.kelly@crowdstrike.com

libbpf: Refactor cleanup in ring_buffer__add

2023-09-25T23:22:42+00:00

Refactor the cleanup code in ring_buffer__add to use a unified err_out
label. This reduces code duplication, as well as plugging a potential
leak if mmap_sz != (__u64)(size_t)mmap_sz (currently this would miss
unmapping tmp because ringbuf_unmap_ring isn't called).

Signed-off-by: Martin Kelly 
Signed-off-by: Andrii Nakryiko 
Link: https://lore.kernel.org/bpf/20230925215045.2375758-2-martin.kelly@crowdstrike.com

libbpf: Use bpf_{btf,link,map,prog}_get_info_by_fd()

2023-02-16T23:32:45+00:00

Use the new type-safe wrappers around bpf_obj_get_info_by_fd().

Signed-off-by: Ilya Leoshkevich 
Signed-off-by: Andrii Nakryiko 
Link: https://lore.kernel.org/bpf/20230214231221.249277-3-iii@linux.ibm.com

Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

2022-11-29T21:04:52+00:00

tools/lib/bpf/ringbuf.c
  927cbb478adf ("libbpf: Handle size overflow for ringbuf mmap")
  b486d19a0ab0 ("libbpf: checkpatch: Fixed code alignments in ringbuf.c")
https://lore.kernel.org/all/20221121122707.44d1446a@canb.auug.org.au/

Signed-off-by: Jakub Kicinski