linux-stable.git/include/linux/bpf.h, branch v4.18.2

bpf: fix attach type BPF_LIRC_MODE2 dependency wrt CONFIG_CGROUP_BPF

2018-06-26T09:28:38+00:00

If the kernel is compiled with CONFIG_CGROUP_BPF not enabled, it is not
possible to attach, detach or query IR BPF programs to /dev/lircN devices,
making them impossible to use. For embedded devices, it should be possible
to use IR decoding without cgroups or CONFIG_CGROUP_BPF enabled.

This change requires some refactoring, since bpf_prog_{attach,detach,query}
functions are now always compiled, but their code paths for cgroups need
moving out. Rather than a #ifdef CONFIG_CGROUP_BPF in kernel/bpf/syscall.c,
moving them to kernel/bpf/cgroup.c and kernel/bpf/sockmap.c does not
require #ifdefs since that is already conditionally compiled.

Fixes: f4364dcfc86d ("media: rc: introduce BPF_PROG_LIRC_MODE2")
Signed-off-by: Sean Young 
Signed-off-by: Daniel Borkmann

xdp: Fix handling of devmap in generic XDP

2018-06-15T21:47:15+00:00

Commit 67f29e07e131 ("bpf: devmap introduce dev_map_enqueue") changed
the return value type of __devmap_lookup_elem() from struct net_device *
to struct bpf_dtab_netdev * but forgot to modify generic XDP code
accordingly.

Thus generic XDP incorrectly used struct bpf_dtab_netdev where struct
net_device is expected, then skb->dev was set to invalid value.

v2:
- Fix compiler warning without CONFIG_BPF_SYSCALL.

Fixes: 67f29e07e131 ("bpf: devmap introduce dev_map_enqueue")
Signed-off-by: Toshiaki Makita 
Acked-by: Yonghong Song 
Acked-by: Jesper Dangaard Brouer 
Signed-off-by: Daniel Borkmann

bpf: implement bpf_get_current_cgroup_id() helper

2018-06-04T01:22:41+00:00

bpf has been used extensively for tracing. For example, bcc
contains an almost full set of bpf-based tools to trace kernel
and user functions/events. Most tracing tools are currently
either filtered based on pid or system-wide.

Containers have been used quite extensively in industry and
cgroup is often used together to provide resource isolation
and protection. Several processes may run inside the same
container. It is often desirable to get container-level tracing
results as well, e.g. syscall count, function count, I/O
activity, etc.

This patch implements a new helper, bpf_get_current_cgroup_id(),
which will return cgroup id based on the cgroup within which
the current task is running.

The later patch will provide an example to show that
userspace can get the same cgroup id so it could
configure a filter or policy in the bpf program based on
task cgroup id.

The helper is currently implemented for tracing. It can
be added to other program types as well when needed.

Acked-by: Alexei Starovoitov 
Signed-off-by: Yonghong Song 
Signed-off-by: Alexei Starovoitov

xdp: add tracepoint for devmap like cpumap have

2018-05-25T01:36:15+00:00

Notice how this allow us get XDP statistic without affecting the XDP
performance, as tracepoint is no-longer activated on a per packet basis.

V5: Spotted by John Fastabend.
 Fix 'sent' also counted 'drops' in this patch, a later patch corrected
 this, but it was a mistake in this intermediate step.

Signed-off-by: Jesper Dangaard Brouer 
Signed-off-by: Alexei Starovoitov

bpf: devmap introduce dev_map_enqueue

2018-05-25T01:36:14+00:00

Functionality is the same, but the ndo_xdp_xmit call is now
simply invoked from inside the devmap.c code.

V2: Fix compile issue reported by kbuild test robot 

V5: Cleanups requested by Daniel
 - Newlines before func definition
 - Use BUILD_BUG_ON checks
 - Remove unnecessary use return value store in dev_map_enqueue

Signed-off-by: Jesper Dangaard Brouer 
Signed-off-by: Alexei Starovoitov

bpf: btf: Rename btf_key_id and btf_value_id in bpf_map_info

2018-05-23T10:03:32+00:00

In "struct bpf_map_info", the name "btf_id", "btf_key_id" and "btf_value_id"
could cause confusion because the "id" of "btf_id" means the BPF obj id
given to the BTF object while
"btf_key_id" and "btf_value_id" means the BTF type id within
that BTF object.

To make it clear, btf_key_id and btf_value_id are
renamed to btf_key_type_id and btf_value_type_id.

Suggested-by: Daniel Borkmann 
Signed-off-by: Martin KaFai Lau 
Acked-by: Yonghong Song 
Signed-off-by: Daniel Borkmann

bpf: Expose check_uarg_tail_zero()

2018-05-23T10:03:31+00:00

This patch exposes check_uarg_tail_zero() which will
be reused by a later BTF patch.  Its name is changed to
bpf_check_uarg_tail_zero().

Signed-off-by: Martin KaFai Lau 
Acked-by: Yonghong Song 
Signed-off-by: Daniel Borkmann

bpf: sockmap, add hash map support

2018-05-15T18:41:03+00:00

Sockmap is currently backed by an array and enforces keys to be
four bytes. This works well for many use cases and was originally
modeled after devmap which also uses four bytes keys. However,
this has become limiting in larger use cases where a hash would
be more appropriate. For example users may want to use the 5-tuple
of the socket as the lookup key.

To support this add hash support.

Signed-off-by: John Fastabend 
Acked-by: David S. Miller 
Signed-off-by: Daniel Borkmann

bpf: xdp: allow offloads to store into rx_queue_index

2018-05-09T16:04:36+00:00

It's fairly easy for offloaded XDP programs to select the RX queue
packets go to.  We need a way of expressing this in the software.
Allow write to the rx_queue_index field of struct xdp_md for
device-bound programs.

Skip convert_ctx_access callback entirely for offloads.

Signed-off-by: Jakub Kicinski 
Reviewed-by: Quentin Monnet 
Signed-off-by: Daniel Borkmann

bpf: offload: allow offloaded programs to use perf event arrays

2018-05-04T21:41:03+00:00

BPF_MAP_TYPE_PERF_EVENT_ARRAY is special as far as offload goes.
The map only holds glue to perf ring, not actual data.  Allow
non-offloaded perf event arrays to be used in offloaded programs.
Offload driver can extract the events from HW and put them in
the map for user space to retrieve.

Signed-off-by: Jakub Kicinski 
Reviewed-by: Quentin Monnet 
Reviewed-by: Jiong Wang 
Signed-off-by: Daniel Borkmann