platform/kernel/linux-starfive.git
2 years agoselftests/xsk: Avoid use-after-free on ctx
Ian Rogers [Thu, 1 Sep 2022 20:26:45 +0000 (13:26 -0700)]
selftests/xsk: Avoid use-after-free on ctx

The put lowers the reference count to 0 and frees ctx, reading it
afterwards is invalid. Move the put after the uses and determine the
last use by the reference count being 1.

Fixes: 39e940d4abfa ("selftests/xsk: Destroy BPF resources only when ctx refcount drops to 0")
Signed-off-by: Ian Rogers <irogers@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Magnus Karlsson <magnus.karlsson@intel.com>
Link: https://lore.kernel.org/bpf/20220901202645.1463552-1-irogers@google.com
2 years agoselftests/bpf: Store BPF object files with .bpf.o extension
Daniel Müller [Thu, 1 Sep 2022 22:22:53 +0000 (22:22 +0000)]
selftests/bpf: Store BPF object files with .bpf.o extension

BPF object files are, in a way, the final artifact produced as part of
the ahead-of-time compilation process. That makes them somewhat special
compared to "regular" object files, which are a intermediate build
artifacts that can typically be removed safely. As such, it can make
sense to name them differently to make it easier to spot this difference
at a glance.

Among others, libbpf-bootstrap [0] has established the extension .bpf.o
for BPF object files. It seems reasonable to follow this example and
establish the same denomination for selftest build artifacts. To that
end, this change adjusts the corresponding part of the build system and
the test programs loading BPF object files to work with .bpf.o files.

  [0] https://github.com/libbpf/libbpf-bootstrap

Suggested-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Müller <deso@posteo.net>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20220901222253.1199242-1-deso@posteo.net
2 years agoselftests/xsk: Add support for zero copy testing
Maciej Fijalkowski [Thu, 1 Sep 2022 11:48:13 +0000 (13:48 +0200)]
selftests/xsk: Add support for zero copy testing

Introduce new mode to xdpxceiver responsible for testing AF_XDP zero
copy support of driver that serves underlying physical device. When
setting up test suite, determine whether driver has ZC support or not by
trying to bind XSK ZC socket to the interface. If it succeeded,
interpret it as ZC support being in place and do softirq and busy poll
tests for zero copy mode.

Note that Rx dropped tests are skipped since ZC path is not touching
rx_dropped stat at all.

Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Magnus Karlsson <magnus.karlsson@intel.com>
Link: https://lore.kernel.org/bpf/20220901114813.16275-7-maciej.fijalkowski@intel.com
2 years agoselftests/xsk: Make sure single threaded test terminates
Maciej Fijalkowski [Thu, 1 Sep 2022 11:48:12 +0000 (13:48 +0200)]
selftests/xsk: Make sure single threaded test terminates

For single threaded poll tests call pthread_kill() from main thread so
that we are sure worker thread has finished its job and it is possible
to proceed with next test types from test suite. It was observed that on
some platforms it takes a bit longer for worker thread to exit and next
test case sees device as busy in this case.

Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Magnus Karlsson <magnus.karlsson@intel.com>
Link: https://lore.kernel.org/bpf/20220901114813.16275-6-maciej.fijalkowski@intel.com
2 years agoselftests/xsk: Add support for executing tests on physical device
Maciej Fijalkowski [Thu, 1 Sep 2022 11:48:11 +0000 (13:48 +0200)]
selftests/xsk: Add support for executing tests on physical device

Currently, architecture of xdpxceiver is designed strictly for
conducting veth based tests. Veth pair is created together with a
network namespace and one of the veth interfaces is moved to the
mentioned netns. Then, separate threads for Tx and Rx are spawned which
will utilize described setup.

Infrastructure described in the paragraph above can not be used for
testing AF_XDP support on physical devices. That testing will be
conducted on a single network interface and same queue. Xskxceiver
needs to be extended to distinguish between veth tests and physical
interface tests.

Since same iface/queue id pair will be used by both Tx/Rx threads for
physical device testing, Tx thread, which happen to run after the Rx
thread, is going to create XSK socket with shared umem flag. In order to
track this setting throughout the lifetime of spawned threads, introduce
'shared_umem' boolean variable to struct ifobject and set it to true
when xdpxceiver is run against physical device. In such case, UMEM size
needs to be doubled, so half of it will be used by Rx thread and other
half by Tx thread. For two step based test types, value of XSKMAP
element under key 0 has to be updated as there is now another socket for
the second step. Also, to avoid race conditions when destroying XSK
resources, move this activity to the main thread after spawned Rx and Tx
threads have finished its job. This way it is possible to gracefully
remove shared umem without introducing synchronization mechanisms.

To run xsk selftests suite on physical device, append "-i $IFACE" when
invoking test_xsk.sh. For veth based tests, simply skip it. When "-i
$IFACE" is in place, under the hood test_xsk.sh will use $IFACE for both
interfaces supplied to xdpxceiver, which in turn will interpret that
this execution of test suite is for a physical device.

Note that currently this makes it possible only to test SKB and DRV mode
(in case underlying device has native XDP support). ZC testing support
is added in a later patch.

Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Magnus Karlsson <magnus.karlsson@intel.com>
Link: https://lore.kernel.org/bpf/20220901114813.16275-5-maciej.fijalkowski@intel.com
2 years agoselftests/xsk: Increase chars for interface name to 16
Maciej Fijalkowski [Thu, 1 Sep 2022 11:48:10 +0000 (13:48 +0200)]
selftests/xsk: Increase chars for interface name to 16

So that "enp240s0f0" or such name can be used against xskxceiver.
While at it, also extend character count for netns name.

Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Magnus Karlsson <magnus.karlsson@intel.com>
Link: https://lore.kernel.org/bpf/20220901114813.16275-4-maciej.fijalkowski@intel.com
2 years agoselftests/xsk: Introduce default Rx pkt stream
Maciej Fijalkowski [Thu, 1 Sep 2022 11:48:09 +0000 (13:48 +0200)]
selftests/xsk: Introduce default Rx pkt stream

In order to prepare xdpxceiver for physical device testing, let us
introduce default Rx pkt stream. Reason for doing it is that physical
device testing will use a UMEM with a doubled size where half of it will
be used by Tx and other half by Rx. This means that pkt addresses will
differ for Tx and Rx streams. Rx thread will initialize the
xsk_umem_info::base_addr that is added here so that pkt_set(), when
working on Rx UMEM will add this offset and second half of UMEM space
will be used. Note that currently base_addr is 0 on both sides. Future
commit will do the mentioned initialization.

Previously, veth based testing worked on separate UMEMs, so single
default stream was fine.

Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Magnus Karlsson <magnus.karlsson@intel.com>
Link: https://lore.kernel.org/bpf/20220901114813.16275-3-maciej.fijalkowski@intel.com
2 years agoselftests/xsk: Query for native XDP support
Maciej Fijalkowski [Thu, 1 Sep 2022 11:48:08 +0000 (13:48 +0200)]
selftests/xsk: Query for native XDP support

Currently, xdpxceiver assumes that underlying device supports XDP in
native mode - it is fine by now since tests can run only on a veth pair.
Future commit is going to allow running test suite against physical
devices, so let us query the device if it is capable of running XDP
programs in native mode. This way xdpxceiver will not try to run
TEST_MODE_DRV if device being tested is not supporting it.

Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Magnus Karlsson <magnus.karlsson@intel.com>
Link: https://lore.kernel.org/bpf/20220901114813.16275-2-maciej.fijalkowski@intel.com
2 years agoselftests/bpf: Amend test_tunnel to exercise BPF_F_TUNINFO_FLAGS
Shmulik Ladkani [Wed, 31 Aug 2022 14:40:10 +0000 (17:40 +0300)]
selftests/bpf: Amend test_tunnel to exercise BPF_F_TUNINFO_FLAGS

Get the tunnel flags in {ipv6}vxlan_get_tunnel_src and ensure they are
aligned with tunnel params set at {ipv6}vxlan_set_tunnel_dst.

Signed-off-by: Shmulik Ladkani <shmulik.ladkani@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20220831144010.174110-2-shmulik.ladkani@gmail.com
2 years agobpf: Support getting tunnel flags
Shmulik Ladkani [Wed, 31 Aug 2022 14:40:09 +0000 (17:40 +0300)]
bpf: Support getting tunnel flags

Existing 'bpf_skb_get_tunnel_key' extracts various tunnel parameters
(id, ttl, tos, local and remote) but does not expose ip_tunnel_info's
tun_flags to the BPF program.

It makes sense to expose tun_flags to the BPF program.

Assume for example multiple GRE tunnels maintained on a single GRE
interface in collect_md mode. The program expects origins to initiate
over GRE, however different origins use different GRE characteristics
(e.g. some prefer to use GRE checksum, some do not; some pass a GRE key,
some do not, etc..).

A BPF program getting tun_flags can therefore remember the relevant
flags (e.g. TUNNEL_CSUM, TUNNEL_SEQ...) for each initiating remote. In
the reply path, the program can use 'bpf_skb_set_tunnel_key' in order
to correctly reply to the remote, using similar characteristics, based
on the stored tunnel flags.

Introduce BPF_F_TUNINFO_FLAGS flag for bpf_skb_get_tunnel_key. If
specified, 'bpf_tunnel_key->tunnel_flags' is set with the tun_flags.

Decided to use the existing unused 'tunnel_ext' as the storage for the
'tunnel_flags' in order to avoid changing bpf_tunnel_key's layout.

Also, the following has been considered during the design:

  1. Convert the "interesting" internal TUNNEL_xxx flags back to BPF_F_yyy
     and place into the new 'tunnel_flags' field. This has 2 drawbacks:

     - The BPF_F_yyy flags are from *set_tunnel_key* enumeration space,
       e.g. BPF_F_ZERO_CSUM_TX. It is awkward that it is "returned" into
       tunnel_flags from a *get_tunnel_key* call.
     - Not all "interesting" TUNNEL_xxx flags can be mapped to existing
       BPF_F_yyy flags, and it doesn't make sense to create new BPF_F_yyy
       flags just for purposes of the returned tunnel_flags.

  2. Place key.tun_flags into 'tunnel_flags' but mask them, keeping only
     "interesting" flags. That's ok, but the drawback is that what's
     "interesting" for my usecase might be limiting for other usecases.

Therefore I decided to expose what's in key.tun_flags *as is*, which seems
most flexible. The BPF user can just choose to ignore bits he's not
interested in. The TUNNEL_xxx are also UAPI, so no harm exposing them
back in the get_tunnel_key call.

Signed-off-by: Shmulik Ladkani <shmulik.ladkani@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20220831144010.174110-1-shmulik.ladkani@gmail.com
2 years agobpf, tnums: Warn against the usage of tnum_in(tnum_range(), ...)
Shung-Hsi Yu [Wed, 31 Aug 2022 03:19:06 +0000 (11:19 +0800)]
bpf, tnums: Warn against the usage of tnum_in(tnum_range(), ...)

Commit a657182a5c51 ("bpf: Don't use tnum_range on array range checking
for poke descriptors") has shown that using tnum_range() as argument to
tnum_in() can lead to misleading code that looks like tight bound check
when in fact the actual allowed range is much wider.

Document such behavior to warn against its usage in general, and suggest
some scenario where result can be trusted.

Signed-off-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/984b37f9fdf7ac36831d2137415a4a915744c1b6.1661462653.git.daniel@iogearbox.net
Link: https://www.openwall.com/lists/oss-security/2022/08/26/1
Link: https://lore.kernel.org/bpf/20220831031907.16133-3-shung-hsi.yu@suse.com
Link: https://lore.kernel.org/bpf/20220831031907.16133-2-shung-hsi.yu@suse.com
2 years agobpf: Only add BTF IDs for socket security hooks when CONFIG_SECURITY_NETWORK is on
Hou Tao [Thu, 1 Sep 2022 06:51:26 +0000 (14:51 +0800)]
bpf: Only add BTF IDs for socket security hooks when CONFIG_SECURITY_NETWORK is on

When CONFIG_SECURITY_NETWORK is disabled, there will be build warnings
from resolve_btfids:

  WARN: resolve_btfids: unresolved symbol bpf_lsm_socket_socketpair
  ......
  WARN: resolve_btfids: unresolved symbol bpf_lsm_inet_conn_established

Fixing it by wrapping these BTF ID definitions by CONFIG_SECURITY_NETWORK.

Fixes: 69fd337a975c ("bpf: per-cgroup lsm flavor")
Fixes: 9113d7e48e91 ("bpf: expose bpf_{g,s}etsockopt to lsm cgroup")
Signed-off-by: Hou Tao <houtao1@huawei.com>
Link: https://lore.kernel.org/r/20220901065126.3856297-1-houtao@huaweicloud.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
2 years agobpf: Remove useless else if
Jiapeng Chong [Wed, 31 Aug 2022 02:16:18 +0000 (10:16 +0800)]
bpf: Remove useless else if

The assignment of the else and else if branches is the same, so the else
if here is redundant, so we remove it and add a comment to make the code
here readable.

./kernel/bpf/cgroup_iter.c:81:6-8: WARNING: possible condition with no effect (if == else).

Link: https://bugzilla.openanolis.cn/show_bug.cgi?id=2016
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Link: https://lore.kernel.org/r/20220831021618.86770-1-jiapeng.chong@linux.alibaba.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
2 years agoMerge branch 'Use this_cpu_xxx for preemption-safety'
Martin KaFai Lau [Thu, 1 Sep 2022 19:11:45 +0000 (12:11 -0700)]
Merge branch 'Use this_cpu_xxx for preemption-safety'

Hou Tao says:

====================

From: Hou Tao <houtao1@huawei.com>

Hi,

The patchset aims to make the update of per-cpu prog->active and per-cpu
bpf_task_storage_busy being preemption-safe. The problem is on same
architectures (e.g. arm64), __this_cpu_{inc|dec|inc_return} are neither
preemption-safe nor IRQ-safe, so under fully preemptible kernel the
concurrent updates on these per-cpu variables may be interleaved and the
final values of these variables may be not zero.

Patch 1 & 2 use the preemption-safe per-cpu helpers to manipulate
prog->active and bpf_task_storage_busy. Patch 3 & 4 add a test case in
map_tests to show the concurrent updates on the per-cpu
bpf_task_storage_busy by using __this_cpu_{inc|dec} are not atomic.

Comments are always welcome.

Regards,
Tao

Change Log:
v2:
* Patch 1: update commit message to indicate the problem is only
  possible for fully preemptible kernel
* Patch 2: a new patch which fixes the problem for prog->active
* Patch 3 & 4: move it to test_maps and make it depend on CONFIG_PREEMPT

v1: https://lore.kernel.org/bpf/20220829142752.330094-1-houtao@huaweicloud.com/
====================

Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
2 years agoselftests/bpf: Test concurrent updates on bpf_task_storage_busy
Hou Tao [Thu, 1 Sep 2022 06:19:38 +0000 (14:19 +0800)]
selftests/bpf: Test concurrent updates on bpf_task_storage_busy

Under full preemptible kernel, task local storage lookup operations on
the same CPU may update per-cpu bpf_task_storage_busy concurrently. If
the update of bpf_task_storage_busy is not preemption safe, the final
value of bpf_task_storage_busy may become not-zero forever and
bpf_task_storage_trylock() will always fail. So add a test case to
ensure the update of bpf_task_storage_busy is preemption safe.

Will skip the test case when CONFIG_PREEMPT is disabled, and it can only
reproduce the problem probabilistically. By increasing
TASK_STORAGE_MAP_NR_LOOP and running it under ARM64 VM with 4-cpus, it
takes about four rounds to reproduce:

> test_maps is modified to only run test_task_storage_map_stress_lookup()
$ export TASK_STORAGE_MAP_NR_THREAD=256
$ export TASK_STORAGE_MAP_NR_LOOP=81920
$ export TASK_STORAGE_MAP_PIN_CPU=1
$ time ./test_maps
test_task_storage_map_stress_lookup(135):FAIL:bad bpf_task_storage_busy got -2

real    0m24.743s
user    0m6.772s
sys     0m17.966s

Signed-off-by: Hou Tao <houtao1@huawei.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/r/20220901061938.3789460-5-houtao@huaweicloud.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
2 years agoselftests/bpf: Move sys_pidfd_open() into task_local_storage_helpers.h
Hou Tao [Thu, 1 Sep 2022 06:19:37 +0000 (14:19 +0800)]
selftests/bpf: Move sys_pidfd_open() into task_local_storage_helpers.h

sys_pidfd_open() is defined twice in both test_bprm_opts.c and
test_local_storage.c, so move it to a common header file. And it will be
used in map_tests as well.

Signed-off-by: Hou Tao <houtao1@huawei.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/r/20220901061938.3789460-4-houtao@huaweicloud.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
2 years agobpf: Use this_cpu_{inc_return|dec} for prog->active
Hou Tao [Thu, 1 Sep 2022 06:19:36 +0000 (14:19 +0800)]
bpf: Use this_cpu_{inc_return|dec} for prog->active

Both __this_cpu_inc_return() and __this_cpu_dec() are not preemption
safe and now migrate_disable() doesn't disable preemption, so the update
of prog-active is not atomic and in theory under fully preemptible kernel
recurisve prevention may do not work.

Fixing by using the preemption-safe and IRQ-safe variants.

Fixes: ca06f55b9002 ("bpf: Add per-program recursion prevention mechanism")
Signed-off-by: Hou Tao <houtao1@huawei.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/r/20220901061938.3789460-3-houtao@huaweicloud.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
2 years agobpf: Use this_cpu_{inc|dec|inc_return} for bpf_task_storage_busy
Hou Tao [Thu, 1 Sep 2022 06:19:35 +0000 (14:19 +0800)]
bpf: Use this_cpu_{inc|dec|inc_return} for bpf_task_storage_busy

Now migrate_disable() does not disable preemption and under some
architectures (e.g. arm64) __this_cpu_{inc|dec|inc_return} are neither
preemption-safe nor IRQ-safe, so for fully preemptible kernel concurrent
lookups or updates on the same task local storage and on the same CPU
may make bpf_task_storage_busy be imbalanced, and
bpf_task_storage_trylock() on the specific cpu will always fail.

Fixing it by using this_cpu_{inc|dec|inc_return} when manipulating
bpf_task_storage_busy.

Fixes: bc235cdb423a ("bpf: Prevent deadlock from recursive bpf_task_storage_[get|delete]")
Signed-off-by: Hou Tao <houtao1@huawei.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/r/20220901061938.3789460-2-houtao@huaweicloud.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
2 years agoMerge branch 'fixes for concurrent htab updates'
Martin KaFai Lau [Wed, 31 Aug 2022 20:35:47 +0000 (13:35 -0700)]
Merge branch 'fixes for concurrent htab updates'

Hou Tao says:

====================

From: Hou Tao <houtao1@huawei.com>

Hi,

The patchset aims to fix the issues found during investigating the
syzkaller problem reported in [0]. It seems that the concurrent updates
to the same hash-table bucket may fail as shown in patch 1.

Patch 1 uses preempt_disable() to fix the problem for
htab_use_raw_lock() case. For !htab_use_raw_lock() case, the problem is
left to "BPF specific memory allocator" patchset [1] in which
!htab_use_raw_lock() will be removed.

Patch 2 fixes the out-of-bound memory read problem reported in [0]. The
problem has the root cause as patch 1 and it is fixed by handling -EBUSY
from htab_lock_bucket() correctly.

Patch 3 add two cases for hash-table update: one for the reentrancy of
bpf_map_update_elem(), and another one for concurrent updates of the
same hash-table bucket.

Comments are always welcome.

Regards,
Tao

[0]: https://lore.kernel.org/bpf/CACkBjsbuxaR6cv0kXJoVnBfL9ZJXjjoUcMpw_Ogc313jSrg14A@mail.gmail.com/
[1]: https://lore.kernel.org/bpf/20220819214232.18784-1-alexei.starovoitov@gmail.com/

Change Log:

v4:
 * rebased on bpf-next
 * add htab_update to DENYLIST.s390x

v3: https://lore.kernel.org/bpf/20220829023709.1958204-1-houtao@huaweicloud.com/
 * patch 1: update commit message and add Fixes tag
 * patch 2: add Fixes tag
 * patch 3: elaborate the description of test cases

v2: https://lore.kernel.org/bpf/bd60ef93-1c6a-2db2-557d-b09b92ad22bd@huaweicloud.com/
 * Note the fix is for CONFIG_PREEMPT case in commit message and add
   Reviewed-by tag for patch 1
 * Drop patch "bpf: Allow normally concurrent map updates for !htab_use_raw_lock() case"

v1: https://lore.kernel.org/bpf/20220821033223.2598791-1-houtao@huaweicloud.com/
====================

Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
2 years agoselftests/bpf: Add test cases for htab update
Hou Tao [Wed, 31 Aug 2022 04:26:29 +0000 (12:26 +0800)]
selftests/bpf: Add test cases for htab update

One test demonstrates the reentrancy of hash map update on the same
bucket should fail, and another one shows concureently updates of
the same hash map bucket should succeed and not fail due to
the reentrancy checking for bucket lock.

There is no trampoline support on s390x, so move htab_update to
denylist.

Signed-off-by: Hou Tao <houtao1@huawei.com>
Link: https://lore.kernel.org/r/20220831042629.130006-4-houtao@huaweicloud.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
2 years agobpf: Propagate error from htab_lock_bucket() to userspace
Hou Tao [Wed, 31 Aug 2022 04:26:28 +0000 (12:26 +0800)]
bpf: Propagate error from htab_lock_bucket() to userspace

In __htab_map_lookup_and_delete_batch() if htab_lock_bucket() returns
-EBUSY, it will go to next bucket. Going to next bucket may not only
skip the elements in current bucket silently, but also incur
out-of-bound memory access or expose kernel memory to userspace if
current bucket_cnt is greater than bucket_size or zero.

Fixing it by stopping batch operation and returning -EBUSY when
htab_lock_bucket() fails, and the application can retry or skip the busy
batch as needed.

Fixes: 20b6cc34ea74 ("bpf: Avoid hashtab deadlock with map_locked")
Reported-by: Hao Sun <sunhao.th@gmail.com>
Signed-off-by: Hou Tao <houtao1@huawei.com>
Link: https://lore.kernel.org/r/20220831042629.130006-3-houtao@huaweicloud.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
2 years agobpf: Disable preemption when increasing per-cpu map_locked
Hou Tao [Wed, 31 Aug 2022 04:26:27 +0000 (12:26 +0800)]
bpf: Disable preemption when increasing per-cpu map_locked

Per-cpu htab->map_locked is used to prohibit the concurrent accesses
from both NMI and non-NMI contexts. But since commit 74d862b682f5
("sched: Make migrate_disable/enable() independent of RT"),
migrate_disable() is also preemptible under CONFIG_PREEMPT case, so now
map_locked also disallows concurrent updates from normal contexts
(e.g. userspace processes) unexpectedly as shown below:

process A                      process B

htab_map_update_elem()
  htab_lock_bucket()
    migrate_disable()
    /* return 1 */
    __this_cpu_inc_return()
    /* preempted by B */

                               htab_map_update_elem()
                                 /* the same bucket as A */
                                 htab_lock_bucket()
                                   migrate_disable()
                                   /* return 2, so lock fails */
                                   __this_cpu_inc_return()
                                   return -EBUSY

A fix that seems feasible is using in_nmi() in htab_lock_bucket() and
only checking the value of map_locked for nmi context. But it will
re-introduce dead-lock on bucket lock if htab_lock_bucket() is re-entered
through non-tracing program (e.g. fentry program).

One cannot use preempt_disable() to fix this issue as htab_use_raw_lock
being false causes the bucket lock to be a spin lock which can sleep and
does not work with preempt_disable().

Therefore, use migrate_disable() when using the spinlock instead of
preempt_disable() and defer fixing concurrent updates to when the kernel
has its own BPF memory allocator.

Fixes: 74d862b682f5 ("sched: Make migrate_disable/enable() independent of RT")
Reviewed-by: Hao Luo <haoluo@google.com>
Signed-off-by: Hou Tao <houtao1@huawei.com>
Link: https://lore.kernel.org/r/20220831042629.130006-2-houtao@huaweicloud.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
2 years agoselftest/bpf: Ensure no module loading in bpf_setsockopt(TCP_CONGESTION)
Martin KaFai Lau [Tue, 30 Aug 2022 23:19:53 +0000 (16:19 -0700)]
selftest/bpf: Ensure no module loading in bpf_setsockopt(TCP_CONGESTION)

This patch adds a test to ensure bpf_setsockopt(TCP_CONGESTION, "not_exist")
will not trigger the kernel module autoload.

Before the fix:

  [   40.535829] BUG: sleeping function called from invalid context at include/linux/sched/mm.h:274
  [...]
  [   40.552134]  tcp_ca_find_autoload.constprop.0+0xcb/0x200
  [   40.552689]  tcp_set_congestion_control+0x99/0x7b0
  [   40.553203]  do_tcp_setsockopt+0x3ed/0x2240
  [...]
  [   40.556041]  __bpf_setsockopt+0x124/0x640

Signed-off-by: Martin KaFai Lau <martin.lau@linux.dev>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20220830231953.792412-1-martin.lau@linux.dev
2 years agobpf, net: Avoid loading module when calling bpf_setsockopt(TCP_CONGESTION)
Martin KaFai Lau [Tue, 30 Aug 2022 23:19:46 +0000 (16:19 -0700)]
bpf, net: Avoid loading module when calling bpf_setsockopt(TCP_CONGESTION)

When bpf prog changes tcp-cc by calling bpf_setsockopt(TCP_CONGESTION),
it should not try to load module which may be a blocking operation.
This details was correct in the v1 [0] but missed by mistake in the
later revision in commit cb388e7ee3a8 ("bpf: net: Change do_tcp_setsockopt()
to use the sockopt's lock_sock() and capable()"). This patch fixes it by
checking the has_current_bpf_ctx().

  [0] https://lore.kernel.org/bpf/20220727060921.2373314-1-kafai@fb.com/

Fixes: cb388e7ee3a8 ("bpf: net: Change do_tcp_setsockopt() to use the sockopt's lock_sock() and capable()")
Signed-off-by: Martin KaFai Lau <martin.lau@linux.dev>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20220830231946.791504-1-martin.lau@linux.dev
2 years agolibbpf: Add GCC support for bpf_tail_call_static
James Hilliard [Mon, 29 Aug 2022 21:05:46 +0000 (15:05 -0600)]
libbpf: Add GCC support for bpf_tail_call_static

The bpf_tail_call_static function is currently not defined unless
using clang >= 8.

To support bpf_tail_call_static on GCC we can check if __clang__ is
not defined to enable bpf_tail_call_static.

We need to use GCC assembly syntax when the compiler does not define
__clang__ as LLVM inline assembly is not fully compatible with GCC.

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20220829210546.755377-1-james.hilliard1@gmail.com
2 years agobpftool: Add support for querying cgroup_iter link
Hao Luo [Mon, 29 Aug 2022 23:18:28 +0000 (16:18 -0700)]
bpftool: Add support for querying cgroup_iter link

Support dumping info of a cgroup_iter link. This includes
showing the cgroup's id and the order for walking the cgroup
hierarchy. Example output is as follows:

> bpftool link show
1: iter  prog 2  target_name bpf_map
2: iter  prog 3  target_name bpf_prog
3: iter  prog 12  target_name cgroup  cgroup_id 72  order self_only

> bpftool -p link show
[{
        "id": 1,
        "type": "iter",
        "prog_id": 2,
        "target_name": "bpf_map"
    },{
        "id": 2,
        "type": "iter",
        "prog_id": 3,
        "target_name": "bpf_prog"
    },{
        "id": 3,
        "type": "iter",
        "prog_id": 12,
        "target_name": "cgroup",
        "cgroup_id": 72,
        "order": "self_only"
    }
]

Signed-off-by: Hao Luo <haoluo@google.com>
Reviewed-by: Quentin Monnet <quentin@isovalent.com>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/r/20220829231828.1016835-1-haoluo@google.com
Signed-off-by: Martin KaFai Lau <martin.lau@linux.dev>
2 years agoselftests/bpf: Fix connect4_prog tcp/socket header type conflict
James Hilliard [Mon, 29 Aug 2022 15:47:09 +0000 (09:47 -0600)]
selftests/bpf: Fix connect4_prog tcp/socket header type conflict

There is a potential for us to hit a type conflict when including
netinet/tcp.h and sys/socket.h, we can replace both of these includes
with linux/tcp.h and bpf_tcp_helpers.h to avoid this conflict.

Fixes errors like the below when compiling with gcc BPF backend:

  In file included from /usr/include/netinet/tcp.h:91,
                   from progs/connect4_prog.c:11:
  /home/buildroot/opt/cross/lib/gcc/bpf/13.0.0/include/stdint.h:34:23: error: conflicting types for 'int8_t'; have 'char'
     34 | typedef __INT8_TYPE__ int8_t;
        |                       ^~~~~~
  In file included from /usr/include/x86_64-linux-gnu/sys/types.h:155,
                   from /usr/include/x86_64-linux-gnu/bits/socket.h:29,
                   from /usr/include/x86_64-linux-gnu/sys/socket.h:33,
                   from progs/connect4_prog.c:10:
  /usr/include/x86_64-linux-gnu/bits/stdint-intn.h:24:18: note: previous declaration of 'int8_t' with type 'int8_t' {aka 'signed char'}
     24 | typedef __int8_t int8_t;
        |                  ^~~~~~
  /home/buildroot/opt/cross/lib/gcc/bpf/13.0.0/include/stdint.h:43:24: error: conflicting types for 'int64_t'; have 'long int'
     43 | typedef __INT64_TYPE__ int64_t;
        |                        ^~~~~~~
  /usr/include/x86_64-linux-gnu/bits/stdint-intn.h:27:19: note: previous declaration of 'int64_t' with type 'int64_t' {aka 'long long int'}
     27 | typedef __int64_t int64_t;
        |                   ^~~~~~~

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20220829154710.3870139-1-james.hilliard1@gmail.com
2 years agoselftests/bpf: Fix bind{4,6} tcp/socket header type conflict
James Hilliard [Fri, 26 Aug 2022 05:29:22 +0000 (23:29 -0600)]
selftests/bpf: Fix bind{4,6} tcp/socket header type conflict

There is a potential for us to hit a type conflict when including
netinet/tcp.h with sys/socket.h, we can remove these as they are not
actually needed.

Fixes errors like the below when compiling with gcc BPF backend:

  In file included from /usr/include/netinet/tcp.h:91,
                   from progs/bind4_prog.c:10:
  /home/buildroot/opt/cross/lib/gcc/bpf/13.0.0/include/stdint.h:34:23: error: conflicting types for 'int8_t'; have 'char'
     34 | typedef __INT8_TYPE__ int8_t;
        |                       ^~~~~~
  In file included from /usr/include/x86_64-linux-gnu/sys/types.h:155,
                   from /usr/include/x86_64-linux-gnu/bits/socket.h:29,
                   from /usr/include/x86_64-linux-gnu/sys/socket.h:33,
                   from progs/bind4_prog.c:9:
  /usr/include/x86_64-linux-gnu/bits/stdint-intn.h:24:18: note: previous declaration of 'int8_t' with type 'int8_t' {aka 'signed char'}
     24 | typedef __int8_t int8_t;
        |                  ^~~~~~
  /home/buildroot/opt/cross/lib/gcc/bpf/13.0.0/include/stdint.h:43:24: error: conflicting types for 'int64_t'; have 'long int'
     43 | typedef __INT64_TYPE__ int64_t;
        |                        ^~~~~~~
  /usr/include/x86_64-linux-gnu/bits/stdint-intn.h:27:19: note: previous declaration of 'int64_t' with type 'int64_t' {aka 'long long int'}
     27 | typedef __int64_t int64_t;
        |                   ^~~~~~~
  make: *** [Makefile:537: /home/buildroot/bpf-next/tools/testing/selftests/bpf/bpf_gcc/bind4_prog.o] Error 1

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20220826052925.980431-1-james.hilliard1@gmail.com
2 years agobpf, mips: No need to use min() to get MAX_TAIL_CALL_CNT
Tiezhu Yang [Mon, 29 Aug 2022 03:05:09 +0000 (11:05 +0800)]
bpf, mips: No need to use min() to get MAX_TAIL_CALL_CNT

MAX_TAIL_CALL_CNT is 33, so min(MAX_TAIL_CALL_CNT, 0xffff) is always
MAX_TAIL_CALL_CNT, it is better to use MAX_TAIL_CALL_CNT directly.

At the same time, add BUILD_BUG_ON(MAX_TAIL_CALL_CNT > 0xffff) with a
comment on why the assertion is there.

Suggested-by: Daniel Borkmann <daniel@iogearbox.net>
Suggested-by: Johan Almbladh <johan.almbladh@anyfinetworks.com>
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/1661742309-2320-1-git-send-email-yangtiezhu@loongson.cn
2 years agobpf: Fix a few typos in BPF helpers documentation
Quentin Monnet [Thu, 25 Aug 2022 22:08:06 +0000 (23:08 +0100)]
bpf: Fix a few typos in BPF helpers documentation

Address a few typos in the documentation for the BPF helper functions.
They were reported by Jakub [0], who ran spell checkers on the generated
man page [1].

[0] https://lore.kernel.org/linux-man/d22dcd47-023c-8f52-d369-7b5308e6c842@gmail.com/T/#mb02e7d4b7fb61d98fa914c77b581184e9a9537af
[1] https://lore.kernel.org/linux-man/eb6a1e41-c48e-ac45-5154-ac57a2c76108@gmail.com/T/#m4a8d1b003616928013ffcd1450437309ab652f9f

v3: Do not copy unrelated (and breaking) elements to tools/ header
v2: Turn a ',' into a ';'

Reported-by: Jakub Wilk <jwilk@jwilk.net>
Signed-off-by: Quentin Monnet <quentin@isovalent.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20220825220806.107143-1-quentin@isovalent.com
2 years agoselftests/bpf: Declare subprog_noise as static in tailcall_bpf2bpf4
James Hilliard [Fri, 26 Aug 2022 03:51:39 +0000 (21:51 -0600)]
selftests/bpf: Declare subprog_noise as static in tailcall_bpf2bpf4

Due to bpf_map_lookup_elem being declared static we need to also
declare subprog_noise as static.

Fixes the following error:
progs/tailcall_bpf2bpf4.c:26:9: error: 'bpf_map_lookup_elem' is static but used in inline function 'subprog_noise' which is not static [-Werror]
   26 |         bpf_map_lookup_elem(&nop_table, &key);
      |         ^~~~~~~~~~~~~~~~~~~

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/bpf/20220826035141.737919-1-james.hilliard1@gmail.com
2 years agoselftests/bpf: fix type conflict in test_tc_dtime
James Hilliard [Fri, 26 Aug 2022 05:06:59 +0000 (23:06 -0600)]
selftests/bpf: fix type conflict in test_tc_dtime

The sys/socket.h header isn't required to build test_tc_dtime and may
cause a type conflict.

Fixes the following error:
In file included from /usr/include/x86_64-linux-gnu/sys/types.h:155,
                 from /usr/include/x86_64-linux-gnu/bits/socket.h:29,
                 from /usr/include/x86_64-linux-gnu/sys/socket.h:33,
                 from progs/test_tc_dtime.c:18:
/usr/include/x86_64-linux-gnu/bits/stdint-intn.h:24:18: error: conflicting types for 'int8_t'; have '__int8_t' {aka 'signed char'}
   24 | typedef __int8_t int8_t;
      |                  ^~~~~~
In file included from progs/test_tc_dtime.c:5:
/home/buildroot/opt/cross/lib/gcc/bpf/13.0.0/include/stdint.h:34:23: note: previous declaration of 'int8_t' with type 'int8_t' {aka 'char'}
   34 | typedef __INT8_TYPE__ int8_t;
      |                       ^~~~~~
/usr/include/x86_64-linux-gnu/bits/stdint-intn.h:27:19: error: conflicting types for 'int64_t'; have '__int64_t' {aka 'long long int'}
   27 | typedef __int64_t int64_t;
      |                   ^~~~~~~
/home/buildroot/opt/cross/lib/gcc/bpf/13.0.0/include/stdint.h:43:24: note: previous declaration of 'int64_t' with type 'int64_t' {aka 'long int'}
   43 | typedef __INT64_TYPE__ int64_t;
      |                        ^~~~~~~
make: *** [Makefile:537: /home/buildroot/bpf-next/tools/testing/selftests/bpf/bpf_gcc/test_tc_dtime.o] Error 1

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Link: https://lore.kernel.org/r/20220826050703.869571-1-james.hilliard1@gmail.com
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
2 years agolibbpf: add map_get_fd_by_id and map_delete_elem in light skeleton
Benjamin Tissoires [Wed, 24 Aug 2022 13:40:37 +0000 (15:40 +0200)]
libbpf: add map_get_fd_by_id and map_delete_elem in light skeleton

This allows to have a better control over maps from the kernel when
preloading eBPF programs.

Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Link: https://lore.kernel.org/r/20220824134055.1328882-8-benjamin.tissoires@redhat.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agobpf: prepare for more bpf syscall to be used from kernel and user space.
Benjamin Tissoires [Wed, 24 Aug 2022 13:40:36 +0000 (15:40 +0200)]
bpf: prepare for more bpf syscall to be used from kernel and user space.

Add BPF_MAP_GET_FD_BY_ID and BPF_MAP_DELETE_PROG.

Only BPF_MAP_GET_FD_BY_ID needs to be amended to be able
to access the bpf pointer either from the userspace or the kernel.

Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Link: https://lore.kernel.org/r/20220824134055.1328882-7-benjamin.tissoires@redhat.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agobpf: Add CGROUP prefix to cgroup_iter_order
Hao Luo [Thu, 25 Aug 2022 22:39:36 +0000 (15:39 -0700)]
bpf: Add CGROUP prefix to cgroup_iter_order

bpf_cgroup_iter_order is globally visible but the entries do not have
CGROUP prefix. As requested by Andrii, put a CGROUP in the names
in bpf_cgroup_iter_order.

This patch fixes two previous commits: one introduced the API and
the other uses the API in bpf selftest (that is, the selftest
cgroup_hierarchical_stats).

I tested this patch via the following command:

  test_progs -t cgroup,iter,btf_dump

Fixes: d4ccaf58a847 ("bpf: Introduce cgroup iter")
Fixes: 88886309d2e8 ("selftests/bpf: add a selftest for cgroup hierarchical stats collection")
Suggested-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Hao Luo <haoluo@google.com>
Link: https://lore.kernel.org/r/20220825223936.1865810-1-haoluo@google.com
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
2 years agobpf/scripts: Assert helper enum value is aligned with comment order
Eyal Birger [Wed, 24 Aug 2022 18:10:43 +0000 (21:10 +0300)]
bpf/scripts: Assert helper enum value is aligned with comment order

The helper value is ABI as defined by enum bpf_func_id.
As bpf_helper_defs.h is used for the userpace part, it must be consistent
with this enum.

Before this change the comments order was used by the bpf_doc script in
order to set the helper values defined in the helpers file.

When adding new helpers it is very puzzling when the userspace application
breaks in weird places if the comment is inserted instead of appended -
because the generated helper ABI is incorrect and shifted.

This commit sets the helper value to the enum value.

In addition it is currently the practice to have the comments appended
and kept in the same order as the enum. As such, add an assertion
validating the comment order is consistent with enum value.

In case a different comments ordering is desired, this assertion can
be lifted.

Signed-off-by: Eyal Birger <eyal.birger@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Reviewed-by: Quentin Monnet <quentin@isovalent.com>
Link: https://lore.kernel.org/bpf/20220824181043.1601429-1-eyal.birger@gmail.com
2 years agobpftool: Fix a wrong type cast in btf_dumper_int
Lam Thai [Wed, 24 Aug 2022 22:59:00 +0000 (15:59 -0700)]
bpftool: Fix a wrong type cast in btf_dumper_int

When `data` points to a boolean value, casting it to `int *` is problematic
and could lead to a wrong value being passed to `jsonw_bool`. Change the
cast to `bool *` instead.

Fixes: b12d6ec09730 ("bpf: btf: add btf print functionality")
Signed-off-by: Lam Thai <lamthai@arista.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Reviewed-by: Quentin Monnet <quentin@isovalent.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20220824225859.9038-1-lamthai@arista.com
2 years agoMerge branch 'bpf: rstat: cgroup hierarchical'
Alexei Starovoitov [Thu, 25 Aug 2022 18:35:38 +0000 (11:35 -0700)]
Merge branch 'bpf: rstat: cgroup hierarchical'

Hao Luo says:

====================

This patch series allows for using bpf to collect hierarchical cgroup
stats efficiently by integrating with the rstat framework. The rstat
framework provides an efficient way to collect cgroup stats percpu and
propagate them through the cgroup hierarchy.

The stats are exposed to userspace in textual form by reading files in
bpffs, similar to cgroupfs stats by using a cgroup_iter program.
cgroup_iter is a type of bpf_iter. It walks over cgroups in four modes:
- walking a cgroup's descendants in pre-order.
- walking a cgroup's descendants in post-order.
- walking a cgroup's ancestors.
- process only a single object.

When attaching cgroup_iter, one needs to set a cgroup to the iter_link
created from attaching. This cgroup can be passed either as a file
descriptor or a cgroup id. That cgroup serves as the starting point of
the walk.

One can also terminate the walk early by returning 1 from the iter
program.

Note that because walking cgroup hierarchy holds cgroup_mutex, the iter
program is called with cgroup_mutex held.

** Background on rstat for stats collection **
(I am using a subscriber analogy that is not commonly used)

The rstat framework maintains a tree of cgroups that have updates and
which cpus have updates. A subscriber to the rstat framework maintains
their own stats. The framework is used to tell the subscriber when
and what to flush, for the most efficient stats propagation. The
workflow is as follows:

- When a subscriber updates a cgroup on a cpu, it informs the rstat
  framework by calling cgroup_rstat_updated(cgrp, cpu).

- When a subscriber wants to read some stats for a cgroup, it asks
  the rstat framework to initiate a stats flush (propagation) by calling
  cgroup_rstat_flush(cgrp).

- When the rstat framework initiates a flush, it makes callbacks to
  subscribers to aggregate stats on cpus that have updates, and
  propagate updates to their parent.

Currently, the main subscribers to the rstat framework are cgroup
subsystems (e.g. memory, block). This patch series allow bpf programs to
become subscribers as well.

Patches in this series are organized as follows:
* Patches 1-2 introduce cgroup_iter prog, and a selftest.
* Patches 3-5 allow bpf programs to integrate with rstat by adding the
  necessary hook points and kfunc. A comprehensive selftest that
  demonstrates the entire workflow for using bpf and rstat to
  efficiently collect and output cgroup stats is added.
---
Changelog:
v8 -> v9:
- Make UNSPEC (an invalid option) as the default order for cgroup_iter.
- Use enum for specifying cgroup_iter order, instead of u32.
- Add BPF_ITER_RESHCED to cgroup_iter.
- Add cgroup_hierarchical_stats to s390x denylist.

v7 -> v8:
- Removed the confusing BPF_ITER_DEFAULT (Andrii)
- s/SELF/SELF_ONLY/g
- Fixed typo (e.g. outputing) (Andrii)
- Use "descendants_pre", "descendants_post" etc. instead of "pre",
  "post" (Andrii)

v6 -> v7:
- Updated commit/comments in cgroup_iter for read() behavior (Yonghong)
- Extracted BPF_ITER_SELF and other options out of cgroup_iter, so
  that they can be used in other iters. Also renamed them. (Andrii)
- Supports both cgroup_fd and cgroup_id when specifying target cgroup.
  (Andrii)
- Avoided using macro for formatting expected output in cgroup_iter
  selftest. (Andrii)
- Applied 'static' on all vars and functions in cgroup_iter selftest.
  (Andrii)
- Fixed broken buf reading in cgroup_iter selftest. (Andrii)
- Switched to use bpf_link__destroy() unconditionally. (Andrii)
- Removed 'volatile' for non-const global vars in selftests. (Andrii)
- Started using bpf_core_enum_value() to get memory_cgrp_id. (Andrii)

v5 -> v6:
- Rebased on bpf-next
- Tidy up cgroup_hierarchical_stats test (Andrii)
  * 'static' and 'inline'
  * avoid using libbpf_get_error()
  * string literals of cgroup paths.
- Rename patch 8/8 to 'selftests/bpf' (Yonghong)
- Fix cgroup_iter comments (e.g. PAGE_SIZE and uapi) (Yonghong)
- Make sure further read() returns OK after previous read() finished
  properly (Yonghong)
- Release cgroup_mutex before the last call of show() (Kumar)

v4 -> v5:
- Rebased on top of new kfunc flags infrastructure, updated patch 1 and
  patch 6 accordingly.
- Added docs for sleepable kfuncs.

v3 -> v4:
- cgroup_iter:
  * reorder fields in bpf_link_info to avoid break uapi (Yonghong)
  * comment the behavior when cgroup_fd=0 (Yonghong)
  * comment on the limit of number of cgroups supported by cgroup_iter.
    (Yonghong)
- cgroup_hierarchical_stats selftest:
  * Do not return -1 if stats are not found (causes overflow in userspace).
  * Check if child process failed to join cgroup.
  * Make buf and path arrays in get_cgroup_vmscan_delay() static.
  * Increase the test map sizes to accomodate cgroups that are not
    created by the test.

v2 -> v3:
- cgroup_iter:
  * Added conditional compilation of cgroup_iter.c in kernel/bpf/Makefile
    (kernel test) and dropped the !CONFIG_CGROUP patch.
  * Added validation of traversal_order when attaching (Yonghong).
  * Fixed previous wording "two modes" to "three modes" (Yonghong).
  * Fixed the btf_dump selftest broken by this patch (Yonghong).
  * Fixed ctx_arg_info[0] to use "PTR_TO_BTF_ID_OR_NULL" instead of
    "PTR_TO_BTF_ID", because the "cgroup" pointer passed to iter prog can
     be null.
- Use __diag_push to eliminate __weak noinline warning in
  bpf_rstat_flush().
- cgroup_hierarchical_stats selftest:
  * Added write_cgroup_file_parent() helper.
  * Added error handling for failed map updates.
  * Added null check for cgroup in vmscan_flush.
  * Fixed the signature of vmscan_[start/end].
  * Correctly return error code when attaching trace programs fail.
  * Make sure all links are destroyed correctly and not leaking in
    cgroup_hierarchical_stats selftest.
  * Use memory.reclaim instead of memory.high as a more reliable way to
    invoke reclaim.
  * Eliminated sleeps, the test now runs faster.

v1 -> v2:
- Redesign of cgroup_iter from v1, based on Alexei's idea [1]:
  * supports walking cgroup subtree.
  * supports walking ancestors of a cgroup. (Andrii)
  * supports terminating the walk early.
  * uses fd instead of cgroup_id as parameter for iter_link. Using fd is
    a convention in bpf.
  * gets cgroup's ref at attach time and deref at detach.
  * brought back cgroup1 support for cgroup_iter.
- Squashed the patches adding the rstat flush hook points and kfuncs
  (Tejun).
- Added a comment explaining why bpf_rstat_flush() needs to be weak
  (Tejun).
- Updated the final selftest with the new cgroup_iter design.
- Changed CHECKs in the selftest with ASSERTs (Yonghong, Andrii).
- Removed empty line at the end of the selftest (Yonghong).
- Renamed test files to cgroup_hierarchical_stats.c.
- Reordered CGROUP_PATH params order to match struct declaration
  in the selftest (Michal).
- Removed memory_subsys_enabled() and made sure memcg controller
  enablement checks make sense and are documented (Michal).

RFC v2 -> v1:
- Instead of introducing a new program type for rstat flushing, add an
  empty hook point, bpf_rstat_flush(), and use fentry bpf programs to
  attach to it and flush bpf stats.
- Instead of using helpers, use kfuncs for rstat functions.
- These changes simplify the patchset greatly, with minimal changes to
  uapi.

RFC v1 -> RFC v2:
- Instead of rstat flush programs attach to subsystems, they now attach
  to rstat (global flushers, not per-subsystem), based on discussions
  with Tejun. The first patch is entirely rewritten.
- Pass cgroup pointers to rstat flushers instead of cgroup ids. This is
  much more flexibility and less likely to need a uapi update later.
- rstat helpers are now only defined if CGROUP_CONFIG.
- Most of the code is now only defined if CGROUP_CONFIG and
  CONFIG_BPF_SYSCALL.
- Move rstat helper protos from bpf_base_func_proto() to
  tracing_prog_func_proto().
- rstat helpers argument (cgroup pointer) is now ARG_PTR_TO_BTF_ID, not
  ARG_ANYTHING.
- Rewrote the selftest to use the cgroup helpers.
- Dropped bpf_map_lookup_percpu_elem (already added by Feng).
- Dropped patch to support cgroup v1 for cgroup_iter.
- Dropped patch to define some cgroup_put() when !CONFIG_CGROUP. The
  code that calls it is no longer compiled when !CONFIG_CGROUP.

cgroup_iter was originally introduced in a different patch series[2].
Hao and I agreed that it fits better as part of this series.
RFC v1 of this patch series had the following changes from [2]:
- Getting the cgroup's reference at the time at attaching, instead of
  at the time when iterating. (Yonghong)
- Remove .init_seq_private and .fini_seq_private callbacks for
  cgroup_iter. They are not needed now. (Yonghong)

[1] https://lore.kernel.org/bpf/20220520221919.jnqgv52k4ajlgzcl@MBP-98dd607d3435.dhcp.thefacebook.com/
[2] https://lore.kernel.org/lkml/20220225234339.2386398-9-haoluo@google.com/

Hao Luo (2):
  bpf: Introduce cgroup iter
  selftests/bpf: Test cgroup_iter.
====================

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agoselftests/bpf: add a selftest for cgroup hierarchical stats collection
Yosry Ahmed [Wed, 24 Aug 2022 23:31:17 +0000 (16:31 -0700)]
selftests/bpf: add a selftest for cgroup hierarchical stats collection

Add a selftest that tests the whole workflow for collecting,
aggregating (flushing), and displaying cgroup hierarchical stats.

TL;DR:
- Userspace program creates a cgroup hierarchy and induces memcg reclaim
  in parts of it.
- Whenever reclaim happens, vmscan_start and vmscan_end update
  per-cgroup percpu readings, and tell rstat which (cgroup, cpu) pairs
  have updates.
- When userspace tries to read the stats, vmscan_dump calls rstat to flush
  the stats, and outputs the stats in text format to userspace (similar
  to cgroupfs stats).
- rstat calls vmscan_flush once for every (cgroup, cpu) pair that has
  updates, vmscan_flush aggregates cpu readings and propagates updates
  to parents.
- Userspace program makes sure the stats are aggregated and read
  correctly.

Detailed explanation:
- The test loads tracing bpf programs, vmscan_start and vmscan_end, to
  measure the latency of cgroup reclaim. Per-cgroup readings are stored in
  percpu maps for efficiency. When a cgroup reading is updated on a cpu,
  cgroup_rstat_updated(cgroup, cpu) is called to add the cgroup to the
  rstat updated tree on that cpu.

- A cgroup_iter program, vmscan_dump, is loaded and pinned to a file, for
  each cgroup. Reading this file invokes the program, which calls
  cgroup_rstat_flush(cgroup) to ask rstat to propagate the updates for all
  cpus and cgroups that have updates in this cgroup's subtree. Afterwards,
  the stats are exposed to the user. vmscan_dump returns 1 to terminate
  iteration early, so that we only expose stats for one cgroup per read.

- An ftrace program, vmscan_flush, is also loaded and attached to
  bpf_rstat_flush. When rstat flushing is ongoing, vmscan_flush is invoked
  once for each (cgroup, cpu) pair that has updates. cgroups are popped
  from the rstat tree in a bottom-up fashion, so calls will always be
  made for cgroups that have updates before their parents. The program
  aggregates percpu readings to a total per-cgroup reading, and also
  propagates them to the parent cgroup. After rstat flushing is over, all
  cgroups will have correct updated hierarchical readings (including all
  cpus and all their descendants).

- Finally, the test creates a cgroup hierarchy and induces memcg reclaim
  in parts of it, and makes sure that the stats collection, aggregation,
  and reading workflow works as expected.

Signed-off-by: Yosry Ahmed <yosryahmed@google.com>
Signed-off-by: Hao Luo <haoluo@google.com>
Link: https://lore.kernel.org/r/20220824233117.1312810-6-haoluo@google.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agoselftests/bpf: extend cgroup helpers
Yosry Ahmed [Wed, 24 Aug 2022 23:31:16 +0000 (16:31 -0700)]
selftests/bpf: extend cgroup helpers

This patch extends bpf selft cgroup_helpers [ID] n various ways:
- Add enable_controllers() that allows tests to enable all or a
  subset of controllers for a specific cgroup.
- Add join_cgroup_parent(). The cgroup workdir is based on the pid,
  therefore a spawned child cannot join the same cgroup hierarchy of the
  test through join_cgroup(). join_cgroup_parent() is used in child
  processes to join a cgroup under the parent's workdir.
- Add write_cgroup_file() and write_cgroup_file_parent() (similar to
  join_cgroup_parent() above).
- Add get_root_cgroup() for tests that need to do checks on root cgroup.
- Distinguish relative and absolute cgroup paths in function arguments.
  Now relative paths are called relative_path, and absolute paths are
  called cgroup_path.

Signed-off-by: Yosry Ahmed <yosryahmed@google.com>
Signed-off-by: Hao Luo <haoluo@google.com>
Link: https://lore.kernel.org/r/20220824233117.1312810-5-haoluo@google.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agocgroup: bpf: enable bpf programs to integrate with rstat
Yosry Ahmed [Wed, 24 Aug 2022 23:31:15 +0000 (16:31 -0700)]
cgroup: bpf: enable bpf programs to integrate with rstat

Enable bpf programs to make use of rstat to collect cgroup hierarchical
stats efficiently:
- Add cgroup_rstat_updated() kfunc, for bpf progs that collect stats.
- Add cgroup_rstat_flush() sleepable kfunc, for bpf progs that read stats.
- Add an empty bpf_rstat_flush() hook that is called during rstat
  flushing, for bpf progs that flush stats to attach to. Attaching a bpf
  prog to this hook effectively registers it as a flush callback.

Signed-off-by: Yosry Ahmed <yosryahmed@google.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Hao Luo <haoluo@google.com>
Link: https://lore.kernel.org/r/20220824233117.1312810-4-haoluo@google.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agoselftests/bpf: Test cgroup_iter.
Hao Luo [Wed, 24 Aug 2022 23:31:14 +0000 (16:31 -0700)]
selftests/bpf: Test cgroup_iter.

Add a selftest for cgroup_iter. The selftest creates a mini cgroup tree
of the following structure:

    ROOT (working cgroup)
     |
   PARENT
  /      \
CHILD1  CHILD2

and tests the following scenarios:

 - invalid cgroup fd.
 - pre-order walk over descendants from PARENT.
 - post-order walk over descendants from PARENT.
 - walk of ancestors from PARENT.
 - process only a single object (i.e. PARENT).
 - early termination.

Acked-by: Yonghong Song <yhs@fb.com>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Hao Luo <haoluo@google.com>
Link: https://lore.kernel.org/r/20220824233117.1312810-3-haoluo@google.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agobpf: Introduce cgroup iter
Hao Luo [Wed, 24 Aug 2022 23:31:13 +0000 (16:31 -0700)]
bpf: Introduce cgroup iter

Cgroup_iter is a type of bpf_iter. It walks over cgroups in four modes:

 - walking a cgroup's descendants in pre-order.
 - walking a cgroup's descendants in post-order.
 - walking a cgroup's ancestors.
 - process only the given cgroup.

When attaching cgroup_iter, one can set a cgroup to the iter_link
created from attaching. This cgroup is passed as a file descriptor
or cgroup id and serves as the starting point of the walk. If no
cgroup is specified, the starting point will be the root cgroup v2.

For walking descendants, one can specify the order: either pre-order or
post-order. For walking ancestors, the walk starts at the specified
cgroup and ends at the root.

One can also terminate the walk early by returning 1 from the iter
program.

Note that because walking cgroup hierarchy holds cgroup_mutex, the iter
program is called with cgroup_mutex held.

Currently only one session is supported, which means, depending on the
volume of data bpf program intends to send to user space, the number
of cgroups that can be walked is limited. For example, given the current
buffer size is 8 * PAGE_SIZE, if the program sends 64B data for each
cgroup, assuming PAGE_SIZE is 4kb, the total number of cgroups that can
be walked is 512. This is a limitation of cgroup_iter. If the output
data is larger than the kernel buffer size, after all data in the
kernel buffer is consumed by user space, the subsequent read() syscall
will signal EOPNOTSUPP. In order to work around, the user may have to
update their program to reduce the volume of data sent to output. For
example, skip some uninteresting cgroups. In future, we may extend
bpf_iter flags to allow customizing buffer size.

Acked-by: Yonghong Song <yhs@fb.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Hao Luo <haoluo@google.com>
Link: https://lore.kernel.org/r/20220824233117.1312810-2-haoluo@google.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agoselftests/bpf: Fix wrong size passed to bpf_setsockopt()
Yang Yingliang [Wed, 24 Aug 2022 01:39:07 +0000 (09:39 +0800)]
selftests/bpf: Fix wrong size passed to bpf_setsockopt()

sizeof(new_cc) is not real memory size that new_cc points to; introduce
a new_cc_len to store the size and then pass it to bpf_setsockopt().

Fixes: 31123c0360e0 ("selftests/bpf: bpf_setsockopt tests")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20220824013907.380448-1-yangyingliang@huawei.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agoselftests/bpf: Add cb_refs test to s390x deny list
Daniel Müller [Wed, 24 Aug 2022 16:39:06 +0000 (16:39 +0000)]
selftests/bpf: Add cb_refs test to s390x deny list

The cb_refs BPF selftest is failing execution on s390x machines. This is
a newly added test that requires a feature not presently supported on
this architecture.

Denylist the test for this architecture.

Fixes: 3cf7e7d8685c ("selftests/bpf: Add tests for reference state fixes for callbacks")
Signed-off-by: Daniel Müller <deso@posteo.net>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20220824163906.1186832-1-deso@posteo.net
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agoMerge branch 'Fix reference state management for synchronous callbacks'
Alexei Starovoitov [Tue, 23 Aug 2022 23:22:00 +0000 (16:22 -0700)]
Merge branch 'Fix reference state management for synchronous callbacks'

Kumar Kartikeya Dwivedi says:

====================

This is patch 1, 2 + their individual tests split into a separate series from
the RFC, so that these can be taken in, while we continue working towards a fix
for handling stack access inside the callback.

Changelog:
----------
v1 -> v2:
v1: https://lore.kernel.org/bpf/20220822131923.21476-1-memxor@gmail.com

  * Fix error for test_progs-no_alu32 due to distinct alloc_insn in errstr

RFC v1 -> v1:
RFC v1: https://lore.kernel.org/bpf/20220815051540.18791-1-memxor@gmail.com

  * Fix up commit log to add more explanation (Alexei)
  * Split reference state fix out into a separate series
====================

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agoselftests/bpf: Add tests for reference state fixes for callbacks
Kumar Kartikeya Dwivedi [Tue, 23 Aug 2022 01:32:26 +0000 (03:32 +0200)]
selftests/bpf: Add tests for reference state fixes for callbacks

These are regression tests to ensure we don't end up in invalid runtime
state for helpers that execute callbacks multiple times. It exercises
the fixes to verifier callback handling for reference state in previous
patches.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20220823013226.24988-1-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agobpf: Fix reference state management for synchronous callbacks
Kumar Kartikeya Dwivedi [Tue, 23 Aug 2022 01:31:25 +0000 (03:31 +0200)]
bpf: Fix reference state management for synchronous callbacks

Currently, verifier verifies callback functions (sync and async) as if
they will be executed once, (i.e. it explores execution state as if the
function was being called once). The next insn to explore is set to
start of subprog and the exit from nested frame is handled using
curframe > 0 and prepare_func_exit. In case of async callback it uses a
customized variant of push_stack simulating a kind of branch to set up
custom state and execution context for the async callback.

While this approach is simple and works when callback really will be
executed only once, it is unsafe for all of our current helpers which
are for_each style, i.e. they execute the callback multiple times.

A callback releasing acquired references of the caller may do so
multiple times, but currently verifier sees it as one call inside the
frame, which then returns to caller. Hence, it thinks it released some
reference that the cb e.g. got access through callback_ctx (register
filled inside cb from spilled typed register on stack).

Similarly, it may see that an acquire call is unpaired inside the
callback, so the caller will copy the reference state of callback and
then will have to release the register with new ref_obj_ids. But again,
the callback may execute multiple times, but the verifier will only
account for acquired references for a single symbolic execution of the
callback, which will cause leaks.

Note that for async callback case, things are different. While currently
we have bpf_timer_set_callback which only executes it once, even for
multiple executions it would be safe, as reference state is NULL and
check_reference_leak would force program to release state before
BPF_EXIT. The state is also unaffected by analysis for the caller frame.
Hence async callback is safe.

Since we want the reference state to be accessible, e.g. for pointers
loaded from stack through callback_ctx's PTR_TO_STACK, we still have to
copy caller's reference_state to callback's bpf_func_state, but we
enforce that whatever references it adds to that reference_state has
been released before it hits BPF_EXIT. This requires introducing a new
callback_ref member in the reference state to distinguish between caller
vs callee references. Hence, check_reference_leak now errors out if it
sees we are in callback_fn and we have not released callback_ref refs.
Since there can be multiple nested callbacks, like frame 0 -> cb1 -> cb2
etc. we need to also distinguish between whether this particular ref
belongs to this callback frame or parent, and only error for our own, so
we store state->frameno (which is always non-zero for callbacks).

In short, callbacks can read parent reference_state, but cannot mutate
it, to be able to use pointers acquired by the caller. They must only
undo their changes (by releasing their own acquired_refs before
BPF_EXIT) on top of caller reference_state before returning (at which
point the caller and callback state will match anyway, so no need to
copy it back to caller).

Fixes: 69c087ba6225 ("bpf: Add bpf_for_each_map_elem() helper")
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20220823013125.24938-1-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agobpf: Move bpf_loop and bpf_for_each_map_elem under CAP_BPF
Kumar Kartikeya Dwivedi [Tue, 23 Aug 2022 01:31:17 +0000 (03:31 +0200)]
bpf: Move bpf_loop and bpf_for_each_map_elem under CAP_BPF

They would require func_info which needs prog BTF anyway. Loading BTF
and setting the prog btf_fd while loading the prog indirectly requires
CAP_BPF, so just to reduce confusion, move both these helpers taking
callback under bpf_capable() protection as well, since they cannot be
used without CAP_BPF.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20220823013117.24916-1-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agoMerge branch 'bpf: expose bpf_{g,s}et_retval to more cgroup hooks'
Alexei Starovoitov [Tue, 23 Aug 2022 23:08:22 +0000 (16:08 -0700)]
Merge branch 'bpf: expose bpf_{g,s}et_retval to more cgroup hooks'

Stanislav Fomichev says:

====================

Apparently, only a small subset of cgroup hooks actually falls
back to cgroup_base_func_proto. This leads to unexpected result
where not all cgroup helpers have bpf_{g,s}et_retval.

It's getting harder and harder to manage which helpers are exported
to which hooks. We now have the following call chains:

- cg_skb_func_proto
  - sk_filter_func_proto
    - bpf_sk_base_func_proto
      - bpf_base_func_proto

So by looking at cg_skb_func_proto it's pretty hard to understand
what's going on.

For cgroup helpers, I'm proposing we do the following instead:

  func_proto = cgroup_common_func_proto();
  if (func_proto) return func_proto;

  /* optional, if hook has 'current' */
  func_proto = cgroup_current_func_proto();
  if (func_proto) return func_proto;

  ...

  switch (func_id) {
  /* hook specific helpers */
  case BPF_FUNC_hook_specific_helper:
    return &xyz;
  default:
    /* always fall back to plain bpf_base_func_proto */
    bpf_base_func_proto(func_id);
  }

If this turns out more workable, we can follow up with converting
the rest to the same pattern.

v5:
- remove net/cls_cgroup.h include from patch 1/5 (Martin)
- move endif changes from patch 1/5 to 3/5 (Martin)
- don't define __weak protos, the ones in core.c suffice (Martin)

v4:
- don't touch existing helper.c helpers (Martin)
- drop unneeded CONFIG_CGROUP_BPF in bpf_lsm_func_proto (Martin)

v3:
- expose strtol/strtoul everywhere (Martin)
- move helpers declarations from bpf.h to bpf-cgroup.h (Martin)
- revise bpf_{g,s}et_retval documentation (Martin)
- don't expose bpf_{g,s}et_retval to cg_skb hooks (Martin)

v2:
- move everything into kernel/bpf/cgroup.c instead (Martin)
- use cgroup_common_func_proto in lsm (Martin)
====================

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agoselftests/bpf: Make sure bpf_{g,s}et_retval is exposed everywhere
Stanislav Fomichev [Tue, 23 Aug 2022 22:25:55 +0000 (15:25 -0700)]
selftests/bpf: Make sure bpf_{g,s}et_retval is exposed everywhere

For each hook, have a simple bpf_set_retval(bpf_get_retval) program
and make sure it loads for the hooks we want. The exceptions are
the hooks which don't propagate the error to the callers:

- sockops
- recvmsg
- getpeername
- getsockname
- cg_skb ingress and egress

Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Link: https://lore.kernel.org/r/20220823222555.523590-6-sdf@google.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agobpf: update bpf_{g,s}et_retval documentation
Stanislav Fomichev [Tue, 23 Aug 2022 22:25:54 +0000 (15:25 -0700)]
bpf: update bpf_{g,s}et_retval documentation

* replace 'syscall' with 'upper layers', still mention that it's being
  exported via syscall errno
* describe what happens in set_retval(-EPERM) + return 1
* describe what happens with bind's 'return 3'

Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Link: https://lore.kernel.org/r/20220823222555.523590-5-sdf@google.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agobpf: expose bpf_strtol and bpf_strtoul to all program types
Stanislav Fomichev [Tue, 23 Aug 2022 22:25:53 +0000 (15:25 -0700)]
bpf: expose bpf_strtol and bpf_strtoul to all program types

bpf_strncmp is already exposed everywhere. The motivation is to keep
those helpers in kernel/bpf/helpers.c. Otherwise it's tempting to move
them under kernel/bpf/cgroup.c because they are currently only used
by sysctl prog types.

Suggested-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Link: https://lore.kernel.org/r/20220823222555.523590-4-sdf@google.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agobpf: Use cgroup_{common,current}_func_proto in more hooks
Stanislav Fomichev [Tue, 23 Aug 2022 22:25:52 +0000 (15:25 -0700)]
bpf: Use cgroup_{common,current}_func_proto in more hooks

The following hooks are per-cgroup hooks but they are not
using cgroup_{common,current}_func_proto, fix it:

* BPF_PROG_TYPE_CGROUP_SKB (cg_skb)
* BPF_PROG_TYPE_CGROUP_SOCK_ADDR (cg_sock_addr)
* BPF_PROG_TYPE_CGROUP_SOCK (cg_sock)
* BPF_PROG_TYPE_LSM+BPF_LSM_CGROUP

Also:

* move common func_proto's into cgroup func_proto handlers
* make sure bpf_{g,s}et_retval are not accessible from recvmsg,
  getpeername and getsockname (return/errno is ignored in these
  places)
* as a side effect, expose get_current_pid_tgid, get_current_comm_proto,
  get_current_ancestor_cgroup_id, get_cgroup_classid to more cgroup
  hooks

Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Link: https://lore.kernel.org/r/20220823222555.523590-3-sdf@google.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agobpf: Introduce cgroup_{common,current}_func_proto
Stanislav Fomichev [Tue, 23 Aug 2022 22:25:51 +0000 (15:25 -0700)]
bpf: Introduce cgroup_{common,current}_func_proto

Split cgroup_base_func_proto into the following:

* cgroup_common_func_proto - common helpers for all cgroup hooks
* cgroup_current_func_proto - common helpers for all cgroup hooks
  running in the process context (== have meaningful 'current').

Move bpf_{g,s}et_retval and other cgroup-related helpers into
kernel/bpf/cgroup.c so they closer to where they are being used.

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/r/20220823222555.523590-2-sdf@google.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agoscripts/bpf: Set date attribute for bpf-helpers(7) man page
Quentin Monnet [Tue, 23 Aug 2022 15:53:27 +0000 (16:53 +0100)]
scripts/bpf: Set date attribute for bpf-helpers(7) man page

The bpf-helpers(7) manual page shipped in the man-pages project is
generated from the documentation contained in the BPF UAPI header, in
the Linux repository, parsed by script/bpf_doc.py and then fed to
rst2man.

The man page should contain the date of last modification of the
documentation. This commit adds the relevant date when generating the
page.

Before:

    $ ./scripts/bpf_doc.py helpers | rst2man | grep '\.TH'
    .TH BPF-HELPERS 7 "" "Linux v5.19-14022-g30d2a4d74e11" ""

After:

    $ ./scripts/bpf_doc.py helpers | rst2man | grep '\.TH'
    .TH BPF-HELPERS 7 "2022-08-15" "Linux v5.19-14022-g30d2a4d74e11" ""

We get the version by using "git log" to look for the commit date of the
latest change to the section of the BPF header containing the
documentation. If the command fails, we just skip the date field. and
keep generating the page.

Reported-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Quentin Monnet <quentin@isovalent.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Alejandro Colomar <alx.manpages@gmail.com>
Link: https://lore.kernel.org/bpf/20220823155327.98888-2-quentin@isovalent.com
2 years agoscripts/bpf: Set version attribute for bpf-helpers(7) man page
Quentin Monnet [Tue, 23 Aug 2022 15:53:26 +0000 (16:53 +0100)]
scripts/bpf: Set version attribute for bpf-helpers(7) man page

The bpf-helpers(7) manual page shipped in the man-pages project is
generated from the documentation contained in the BPF UAPI header, in
the Linux repository, parsed by script/bpf_doc.py and then fed to
rst2man.

After a recent update of that page [0], Alejandro reported that the
linter used to validate the man pages complains about the generated
document [1]. The header for the page is supposed to contain some
attributes that we do not set correctly with the script. This commit
updates the "project and version" field. We discussed the format of
those fields in [1] and [2].

Before:

    $ ./scripts/bpf_doc.py helpers | rst2man | grep '\.TH'
    .TH BPF-HELPERS 7 "" "" ""

After:

    $ ./scripts/bpf_doc.py helpers | rst2man | grep '\.TH'
    .TH BPF-HELPERS 7 "" "Linux v5.19-14022-g30d2a4d74e11" ""

We get the version from "git describe", but if unavailable, we fall back
on "make kernelversion". If none works, for example because neither git
nore make are installed, we just set the field to "Linux" and keep
generating the page.

[0] https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/commit/man7/bpf-helpers.7?id=19c7f78393f2b038e76099f87335ddf43a87f039
[1] https://lore.kernel.org/all/20220823084719.13613-1-quentin@isovalent.com/t/#m58a418a318642c6428e14ce9bb84eba5183b06e8
[2] https://lore.kernel.org/all/20220721110821.8240-1-alx.manpages@gmail.com/t/#m8e689a822e03f6e2530a0d6de9d128401916c5de

Reported-by: Alejandro Colomar <alx.manpages@gmail.com>
Signed-off-by: Quentin Monnet <quentin@isovalent.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Alejandro Colomar <alx.manpages@gmail.com>
Link: https://lore.kernel.org/bpf/20220823155327.98888-1-quentin@isovalent.com
2 years agobpf, selftests: Test BPF_FLOW_DISSECTOR_CONTINUE
Shmulik Ladkani [Sun, 21 Aug 2022 11:35:19 +0000 (14:35 +0300)]
bpf, selftests: Test BPF_FLOW_DISSECTOR_CONTINUE

The dissector program returns BPF_FLOW_DISSECTOR_CONTINUE (and avoids
setting skb->flow_keys or last_dissection map) in case it encounters
IP packets whose (outer) source address is 127.0.0.127.

Additional test is added to prog_tests/flow_dissector.c which sets
this address as test's pkk.iph.saddr, with the expected retval of
BPF_FLOW_DISSECTOR_CONTINUE.

Also, legacy test_flow_dissector.sh was similarly augmented.

Signed-off-by: Shmulik Ladkani <shmulik.ladkani@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Stanislav Fomichev <sdf@google.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20220821113519.116765-5-shmulik.ladkani@gmail.com
2 years agobpf, test_run: Propagate bpf_flow_dissect's retval to user's bpf_attr.test.retval
Shmulik Ladkani [Sun, 21 Aug 2022 11:35:18 +0000 (14:35 +0300)]
bpf, test_run: Propagate bpf_flow_dissect's retval to user's bpf_attr.test.retval

Formerly, a boolean denoting whether bpf_flow_dissect returned BPF_OK
was set into 'bpf_attr.test.retval'.

Augment this, so users can check the actual return code of the dissector
program under test.

Existing prog_tests/flow_dissector*.c tests were correspondingly changed
to check against each test's expected retval.

Also, tests' resulting 'flow_keys' are verified only in case the expected
retval is BPF_OK. This allows adding new tests that expect non BPF_OK.

Signed-off-by: Shmulik Ladkani <shmulik.ladkani@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Stanislav Fomichev <sdf@google.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20220821113519.116765-4-shmulik.ladkani@gmail.com
2 years agobpf, flow_dissector: Introduce BPF_FLOW_DISSECTOR_CONTINUE retcode for bpf progs
Shmulik Ladkani [Sun, 21 Aug 2022 11:35:17 +0000 (14:35 +0300)]
bpf, flow_dissector: Introduce BPF_FLOW_DISSECTOR_CONTINUE retcode for bpf progs

Currently, attaching BPF_PROG_TYPE_FLOW_DISSECTOR programs completely
replaces the flow-dissector logic with custom dissection logic. This
forces implementors to write programs that handle dissection for any
flows expected in the namespace.

It makes sense for flow-dissector BPF programs to just augment the
dissector with custom logic (e.g. dissecting certain flows or custom
protocols), while enjoying the broad capabilities of the standard
dissector for any other traffic.

Introduce BPF_FLOW_DISSECTOR_CONTINUE retcode. Flow-dissector BPF
programs may return this to indicate no dissection was made, and
fallback to the standard dissector is requested.

Signed-off-by: Shmulik Ladkani <shmulik.ladkani@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Stanislav Fomichev <sdf@google.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20220821113519.116765-3-shmulik.ladkani@gmail.com
2 years agoflow_dissector: Make 'bpf_flow_dissect' return the bpf program retcode
Shmulik Ladkani [Sun, 21 Aug 2022 11:35:16 +0000 (14:35 +0300)]
flow_dissector: Make 'bpf_flow_dissect' return the bpf program retcode

Let 'bpf_flow_dissect' callers know the BPF program's retcode and act
accordingly.

Signed-off-by: Shmulik Ladkani <shmulik.ladkani@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Stanislav Fomichev <sdf@google.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20220821113519.116765-2-shmulik.ladkani@gmail.com
2 years agoselftest/bpf: Add setget_sockopt to DENYLIST.s390x
Martin KaFai Lau [Fri, 19 Aug 2022 19:21:55 +0000 (12:21 -0700)]
selftest/bpf: Add setget_sockopt to DENYLIST.s390x

Trampoline is not supported in s390.

Fixes: 31123c0360e0 ("selftests/bpf: bpf_setsockopt tests")
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/r/20220819192155.91713-1-kafai@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agoselftests/bpf: Fix spelling mistake.
Colin Ian King [Wed, 17 Aug 2022 21:32:42 +0000 (22:32 +0100)]
selftests/bpf: Fix spelling mistake.

There is a spelling mistake in an ASSERT_OK literal string. Fix it.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Acked-by: Mykola Lysenko <mykolal@fb.com>
Link: https://lore.kernel.org/r/20220817213242.101277-1-colin.i.king@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agoMerge branch 'bpf: net: Remove duplicated code from bpf_setsockopt()'
Alexei Starovoitov [Fri, 19 Aug 2022 00:06:14 +0000 (17:06 -0700)]
Merge branch 'bpf: net: Remove duplicated code from bpf_setsockopt()'

Martin KaFai Lau says:

====================

The code in bpf_setsockopt() is mostly a copy-and-paste from
the sock_setsockopt(), do_tcp_setsockopt(), do_ipv6_setsockopt(),
and do_ip_setsockopt().  As the allowed optnames in bpf_setsockopt()
grows, so are the duplicated code.  The code between the copies
also slowly drifted.

This set is an effort to clean this up and reuse the existing
{sock,do_tcp,do_ipv6,do_ip}_setsockopt() as much as possible.

After the clean up, this set also adds a few allowed optnames
that we need to the bpf_setsockopt().

The initial attempt was to clean up both bpf_setsockopt() and
bpf_getsockopt() together.  However, the patch set was getting
too long.  It is beneficial to leave the bpf_getsockopt()
out for another patch set.  Thus, this set is focusing
on the bpf_setsockopt().

v4:
- This set now depends on the commit f574f7f839fc ("net: bpf: Use the protocol's set_rcvlowat behavior if there is one")
  in the net-next tree.  The commit calls a specific protocol's
  set_rcvlowat and it changed the bpf_setsockopt
  which this set has also changed.

  Because of this, patch 9 of this set has also adjusted
  and a 'sock' NULL check is added to the sk_setsockopt()
  because some of the bpf hooks have a NULL sk->sk_socket.
  This removes more dup code from the bpf_setsockopt() side.
- Avoid mentioning specific prog types in the comment of
  the has_current_bpf_ctx(). (Andrii)
- Replace signed with unsigned int bitfield in the
  patch 15 selftest. (Daniel)

v3:
- s/in_bpf/has_current_bpf_ctx/ (Andrii)
- Add comment to has_current_bpf_ctx() and sockopt_lock_sock()
  (Stanislav)
- Use vmlinux.h in selftest and add defines to bpf_tracing_net.h
  (Stanislav)
- Use bpf_getsockopt(SO_MARK) in selftest (Stanislav)
- Use BPF_CORE_READ_BITFIELD in selftest (Yonghong)

v2:
- A major change is to use in_bpf() to test if a setsockopt()
  is called by a bpf prog and use in_bpf() to skip capable
  check.  Suggested by Stanislav.
- Instead of passing is_locked through sockptr_t or through an extra
  argument to sk_setsockopt, v2 uses in_bpf() to skip the lock_sock()
  also because bpf prog has the lock acquired.
- No change to the current sockptr_t in this revision
- s/codes/code/
====================

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agoselftests/bpf: bpf_setsockopt tests
Martin KaFai Lau [Wed, 17 Aug 2022 06:18:47 +0000 (23:18 -0700)]
selftests/bpf: bpf_setsockopt tests

This patch adds tests to exercise optnames that are allowed
in bpf_setsockopt().

Reviewed-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/r/20220817061847.4182339-1-kafai@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agobpf: Add a few optnames to bpf_setsockopt
Martin KaFai Lau [Wed, 17 Aug 2022 06:18:41 +0000 (23:18 -0700)]
bpf: Add a few optnames to bpf_setsockopt

This patch adds a few optnames for bpf_setsockopt:
SO_REUSEADDR, IPV6_AUTOFLOWLABEL, TCP_MAXSEG, TCP_NODELAY,
and TCP_THIN_LINEAR_TIMEOUTS.

Thanks to the previous patches of this set, all additions can reuse
the sk_setsockopt(), do_ipv6_setsockopt(), and do_tcp_setsockopt().
The only change here is to allow them in bpf_setsockopt.

The bpf prog has been able to read all members of a sk by
using PTR_TO_BTF_ID of a sk.  The optname additions here can also be
read by the same approach.  Meaning there is a way to read
the values back.

These optnames can also be added to bpf_getsockopt() later with
another patch set that makes the bpf_getsockopt() to reuse
the sock_getsockopt(), tcp_getsockopt(), and ip[v6]_getsockopt().
Thus, this patch does not add more duplicated code to
bpf_getsockopt() now.

Reviewed-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/r/20220817061841.4181642-1-kafai@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agobpf: Change bpf_setsockopt(SOL_IPV6) to reuse do_ipv6_setsockopt()
Martin KaFai Lau [Wed, 17 Aug 2022 06:18:34 +0000 (23:18 -0700)]
bpf: Change bpf_setsockopt(SOL_IPV6) to reuse do_ipv6_setsockopt()

After the prep work in the previous patches,
this patch removes the dup code from bpf_setsockopt(SOL_IPV6)
and reuses the implementation in do_ipv6_setsockopt().

ipv6 could be compiled as a module.  Like how other code solved it
with stubs in ipv6_stubs.h, this patch adds the do_ipv6_setsockopt
to the ipv6_bpf_stub.

The current bpf_setsockopt(IPV6_TCLASS) does not take the
INET_ECN_MASK into the account for tcp.  The
do_ipv6_setsockopt(IPV6_TCLASS) will handle it correctly.

The existing optname white-list is refactored into a new
function sol_ipv6_setsockopt().

After this last SOL_IPV6 dup code removal, the __bpf_setsockopt()
is simplified enough that the extra "{ }" around the if statement
can be removed.

Reviewed-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/r/20220817061834.4181198-1-kafai@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agobpf: Change bpf_setsockopt(SOL_IP) to reuse do_ip_setsockopt()
Martin KaFai Lau [Wed, 17 Aug 2022 06:18:26 +0000 (23:18 -0700)]
bpf: Change bpf_setsockopt(SOL_IP) to reuse do_ip_setsockopt()

After the prep work in the previous patches,
this patch removes the dup code from bpf_setsockopt(SOL_IP)
and reuses the implementation in do_ip_setsockopt().

The existing optname white-list is refactored into a new
function sol_ip_setsockopt().

NOTE,
the current bpf_setsockopt(IP_TOS) is quite different from the
the do_ip_setsockopt(IP_TOS).  For example, it does not take
the INET_ECN_MASK into the account for tcp and also does not adjust
sk->sk_priority.  It looks like the current bpf_setsockopt(IP_TOS)
was referencing the IPV6_TCLASS implementation instead of IP_TOS.
This patch tries to rectify that by using the do_ip_setsockopt(IP_TOS).
While this is a behavior change,  the do_ip_setsockopt(IP_TOS) behavior
is arguably what the user is expecting.  At least, the INET_ECN_MASK bits
should be masked out for tcp.

Reviewed-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/r/20220817061826.4180990-1-kafai@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agobpf: Change bpf_setsockopt(SOL_TCP) to reuse do_tcp_setsockopt()
Martin KaFai Lau [Wed, 17 Aug 2022 06:18:19 +0000 (23:18 -0700)]
bpf: Change bpf_setsockopt(SOL_TCP) to reuse do_tcp_setsockopt()

After the prep work in the previous patches,
this patch removes all the dup code from bpf_setsockopt(SOL_TCP)
and reuses the do_tcp_setsockopt().

The existing optname white-list is refactored into a new
function sol_tcp_setsockopt().  The sol_tcp_setsockopt()
also calls the bpf_sol_tcp_setsockopt() to handle
the TCP_BPF_XXX specific optnames.

bpf_setsockopt(TCP_SAVE_SYN) now also allows a value 2 to
save the eth header also and it comes for free from
do_tcp_setsockopt().

Reviewed-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/r/20220817061819.4180146-1-kafai@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agobpf: Refactor bpf specific tcp optnames to a new function
Martin KaFai Lau [Wed, 17 Aug 2022 06:18:12 +0000 (23:18 -0700)]
bpf: Refactor bpf specific tcp optnames to a new function

The patch moves all bpf specific tcp optnames (TCP_BPF_XXX)
to a new function bpf_sol_tcp_setsockopt().  This will make
the next patch easier to follow.

Reviewed-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/r/20220817061812.4179645-1-kafai@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agobpf: Change bpf_setsockopt(SOL_SOCKET) to reuse sk_setsockopt()
Martin KaFai Lau [Wed, 17 Aug 2022 06:18:04 +0000 (23:18 -0700)]
bpf: Change bpf_setsockopt(SOL_SOCKET) to reuse sk_setsockopt()

After the prep work in the previous patches,
this patch removes most of the dup code from bpf_setsockopt(SOL_SOCKET)
and reuses them from sk_setsockopt().

The sock ptr test is added to the SO_RCVLOWAT because
the sk->sk_socket could be NULL in some of the bpf hooks.

The existing optname white-list is refactored into a new
function sol_socket_setsockopt().

Reviewed-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/r/20220817061804.4178920-1-kafai@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agobpf: Embed kernel CONFIG check into the if statement in bpf_setsockopt
Martin KaFai Lau [Wed, 17 Aug 2022 06:17:58 +0000 (23:17 -0700)]
bpf: Embed kernel CONFIG check into the if statement in bpf_setsockopt

This patch moves the "#ifdef CONFIG_XXX" check into the "if/else"
statement itself.  The change is done for the bpf_setsockopt()
function only.  It will make the latter patches easier to follow
without the surrounding ifdef macro.

Reviewed-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/r/20220817061758.4178374-1-kafai@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agobpf: Initialize the bpf_run_ctx in bpf_iter_run_prog()
Martin KaFai Lau [Wed, 17 Aug 2022 06:17:51 +0000 (23:17 -0700)]
bpf: Initialize the bpf_run_ctx in bpf_iter_run_prog()

The bpf-iter-prog for tcp and unix sk can do bpf_setsockopt()
which needs has_current_bpf_ctx() to decide if it is called by a
bpf prog.  This patch initializes the bpf_run_ctx in
bpf_iter_run_prog() for the has_current_bpf_ctx() to use.

Acked-by: Andrii Nakryiko <andrii@kernel.org>
Reviewed-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/r/20220817061751.4177657-1-kafai@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agobpf: net: Change do_ipv6_setsockopt() to use the sockopt's lock_sock() and capable()
Martin KaFai Lau [Wed, 17 Aug 2022 06:17:44 +0000 (23:17 -0700)]
bpf: net: Change do_ipv6_setsockopt() to use the sockopt's lock_sock() and capable()

Similar to the earlier patch that avoids sk_setsockopt() from
taking sk lock and doing capable test when called by bpf.  This patch
changes do_ipv6_setsockopt() to use the sockopt_{lock,release}_sock()
and sockopt_[ns_]capable().

Reviewed-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/r/20220817061744.4176893-1-kafai@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agobpf: net: Change do_ip_setsockopt() to use the sockopt's lock_sock() and capable()
Martin KaFai Lau [Wed, 17 Aug 2022 06:17:37 +0000 (23:17 -0700)]
bpf: net: Change do_ip_setsockopt() to use the sockopt's lock_sock() and capable()

Similar to the earlier patch that avoids sk_setsockopt() from
taking sk lock and doing capable test when called by bpf.  This patch
changes do_ip_setsockopt() to use the sockopt_{lock,release}_sock()
and sockopt_[ns_]capable().

Reviewed-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/r/20220817061737.4176402-1-kafai@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agobpf: net: Change do_tcp_setsockopt() to use the sockopt's lock_sock() and capable()
Martin KaFai Lau [Wed, 17 Aug 2022 06:17:30 +0000 (23:17 -0700)]
bpf: net: Change do_tcp_setsockopt() to use the sockopt's lock_sock() and capable()

Similar to the earlier patch that avoids sk_setsockopt() from
taking sk lock and doing capable test when called by bpf.  This patch
changes do_tcp_setsockopt() to use the sockopt_{lock,release}_sock()
and sockopt_[ns_]capable().

Reviewed-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/r/20220817061730.4176021-1-kafai@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agobpf: net: Consider has_current_bpf_ctx() when testing capable() in sk_setsockopt()
Martin KaFai Lau [Wed, 17 Aug 2022 06:17:23 +0000 (23:17 -0700)]
bpf: net: Consider has_current_bpf_ctx() when testing capable() in sk_setsockopt()

When bpf program calling bpf_setsockopt(SOL_SOCKET),
it could be run in softirq and doesn't make sense to do the capable
check.  There was a similar situation in bpf_setsockopt(TCP_CONGESTION).
In commit 8d650cdedaab ("tcp: fix tcp_set_congestion_control() use from bpf hook"),
tcp_set_congestion_control(..., cap_net_admin) was added to skip
the cap check for bpf prog.

This patch adds sockopt_ns_capable() and sockopt_capable() for
the sk_setsockopt() to use.  They will consider the
has_current_bpf_ctx() before doing the ns_capable() and capable() test.
They are in EXPORT_SYMBOL for the ipv6 module to use in a latter patch.

Suggested-by: Stanislav Fomichev <sdf@google.com>
Reviewed-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/r/20220817061723.4175820-1-kafai@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agobpf: net: Avoid sk_setsockopt() taking sk lock when called from bpf
Martin KaFai Lau [Wed, 17 Aug 2022 06:17:17 +0000 (23:17 -0700)]
bpf: net: Avoid sk_setsockopt() taking sk lock when called from bpf

Most of the code in bpf_setsockopt(SOL_SOCKET) are duplicated from
the sk_setsockopt().  The number of supported optnames are
increasing ever and so as the duplicated code.

One issue in reusing sk_setsockopt() is that the bpf prog
has already acquired the sk lock.  This patch adds a
has_current_bpf_ctx() to tell if the sk_setsockopt() is called from
a bpf prog.  The bpf prog calling bpf_setsockopt() is either running
in_task() or in_serving_softirq().  Both cases have the current->bpf_ctx
initialized.  Thus, the has_current_bpf_ctx() only needs to
test !!current->bpf_ctx.

This patch also adds sockopt_{lock,release}_sock() helpers
for sk_setsockopt() to use.  These helpers will test
has_current_bpf_ctx() before acquiring/releasing the lock.  They are
in EXPORT_SYMBOL for the ipv6 module to use in a latter patch.

Note on the change in sock_setbindtodevice().  sockopt_lock_sock()
is done in sock_setbindtodevice() instead of doing the lock_sock
in sock_bindtoindex(..., lock_sk = true).

Reviewed-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/r/20220817061717.4175589-1-kafai@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agonet: Add sk_setsockopt() to take the sk ptr instead of the sock ptr
Martin KaFai Lau [Wed, 17 Aug 2022 06:17:11 +0000 (23:17 -0700)]
net: Add sk_setsockopt() to take the sk ptr instead of the sock ptr

A latter patch refactors bpf_setsockopt(SOL_SOCKET) with the
sock_setsockopt() to avoid code duplication and code
drift between the two duplicates.

The current sock_setsockopt() takes sock ptr as the argument.
The very first thing of this function is to get back the sk ptr
by 'sk = sock->sk'.

bpf_setsockopt() could be called when the sk does not have
the sock ptr created.  Meaning sk->sk_socket is NULL.  For example,
when a passive tcp connection has just been established but has yet
been accept()-ed.  Thus, it cannot use the sock_setsockopt(sk->sk_socket)
or else it will pass a NULL ptr.

This patch moves all sock_setsockopt implementation to the newly
added sk_setsockopt().  The new sk_setsockopt() takes a sk ptr
and immediately gets the sock ptr by 'sock = sk->sk_socket'

The existing sock_setsockopt(sock) is changed to call
sk_setsockopt(sock->sk).  All existing callers have both sock->sk
and sk->sk_socket pointer.

The latter patch will make bpf_setsockopt(SOL_SOCKET) call
sk_setsockopt(sk) directly.  The bpf_setsockopt(SOL_SOCKET) does
not use the optnames that require sk->sk_socket, so it will
be safe.

Reviewed-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/r/20220817061711.4175048-1-kafai@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2 years agonet: ethernet: altera: Add use of ethtool_op_get_ts_info
Maxime Chevallier [Wed, 17 Aug 2022 09:57:25 +0000 (11:57 +0200)]
net: ethernet: altera: Add use of ethtool_op_get_ts_info

Add the ethtool_op_get_ts_info() callback to ethtool ops, so that we can
at least use software timestamping.

Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Link: https://lore.kernel.org/r/20220817095725.97444-1-maxime.chevallier@bootlin.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2 years agostmmac: intel: remove unused 'has_crossts' flag
Wong Vee Khee [Wed, 17 Aug 2022 06:43:24 +0000 (14:43 +0800)]
stmmac: intel: remove unused 'has_crossts' flag

The 'has_crossts' flag was not used anywhere in the stmmac driver,
removing it from both header file and dwmac-intel driver.

Signed-off-by: Wong Vee Khee <veekhee@apple.com>
Reviewed-by: Kurt Kanzenbach <kurt@linutronix.de>
Link: https://lore.kernel.org/r/20220817064324.10025-1-veekhee@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2 years agoMerge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next
Jakub Kicinski [Thu, 18 Aug 2022 03:29:34 +0000 (20:29 -0700)]
Merge https://git./linux/kernel/git/bpf/bpf-next

Andrii Nakryiko says:

====================
bpf-next 2022-08-17

We've added 45 non-merge commits during the last 14 day(s) which contain
a total of 61 files changed, 986 insertions(+), 372 deletions(-).

The main changes are:

1) New bpf_ktime_get_tai_ns() BPF helper to access CLOCK_TAI, from Kurt
   Kanzenbach and Jesper Dangaard Brouer.

2) Few clean ups and improvements for libbpf 1.0, from Andrii Nakryiko.

3) Expose crash_kexec() as kfunc for BPF programs, from Artem Savkov.

4) Add ability to define sleepable-only kfuncs, from Benjamin Tissoires.

5) Teach libbpf's bpf_prog_load() and bpf_map_create() to gracefully handle
   unsupported names on old kernels, from Hangbin Liu.

6) Allow opting out from auto-attaching BPF programs by libbpf's BPF skeleton,
   from Hao Luo.

7) Relax libbpf's requirement for shared libs to be marked executable, from
   Henqgi Chen.

8) Improve bpf_iter internals handling of error returns, from Hao Luo.

9) Few accommodations in libbpf to support GCC-BPF quirks, from James Hilliard.

10) Fix BPF verifier logic around tracking dynptr ref_obj_id, from Joanne Koong.

11) bpftool improvements to handle full BPF program names better, from Manu
    Bretelle.

12) bpftool fixes around libcap use, from Quentin Monnet.

13) BPF map internals clean ups and improvements around memory allocations,
    from Yafang Shao.

14) Allow to use cgroup_get_from_file() on cgroupv1, allowing BPF cgroup
    iterator to work on cgroupv1, from Yosry Ahmed.

15) BPF verifier internal clean ups, from Dave Marchevsky and Joanne Koong.

16) Various fixes and clean ups for selftests/bpf and vmtest.sh, from Daniel
    Xu, Artem Savkov, Joanne Koong, Andrii Nakryiko, Shibin Koikkara Reeny.

* https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next: (45 commits)
  selftests/bpf: Few fixes for selftests/bpf built in release mode
  libbpf: Clean up deprecated and legacy aliases
  libbpf: Streamline bpf_attr and perf_event_attr initialization
  libbpf: Fix potential NULL dereference when parsing ELF
  selftests/bpf: Tests libbpf autoattach APIs
  libbpf: Allows disabling auto attach
  selftests/bpf: Fix attach point for non-x86 arches in test_progs/lsm
  libbpf: Making bpf_prog_load() ignore name if kernel doesn't support
  selftests/bpf: Update CI kconfig
  selftests/bpf: Add connmark read test
  selftests/bpf: Add existing connection bpf_*_ct_lookup() test
  bpftool: Clear errno after libcap's checks
  bpf: Clear up confusion in bpf_skb_adjust_room()'s documentation
  bpftool: Fix a typo in a comment
  libbpf: Add names for auxiliary maps
  bpf: Use bpf_map_area_alloc consistently on bpf map creation
  bpf: Make __GFP_NOWARN consistent in bpf map creation
  bpf: Use bpf_map_area_free instread of kvfree
  bpf: Remove unneeded memset in queue_stack_map creation
  libbpf: preserve errno across pr_warn/pr_info/pr_debug
  ...
====================

Link: https://lore.kernel.org/r/20220817215656.1180215-1-andrii@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2 years agoselftests/bpf: Few fixes for selftests/bpf built in release mode
Andrii Nakryiko [Tue, 16 Aug 2022 00:19:29 +0000 (17:19 -0700)]
selftests/bpf: Few fixes for selftests/bpf built in release mode

Fix few issues found when building and running test_progs in
release mode.

First, potentially uninitialized idx variable in xskxceiver,
force-initialize to zero to satisfy compiler.

Few instances of defining uprobe trigger functions break in release mode
unless marked as noinline, due to being static. Add noinline to make
sure everything works.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Hao Luo <haoluo@google.com>
Link: https://lore.kernel.org/bpf/20220816001929.369487-5-andrii@kernel.org
2 years agolibbpf: Clean up deprecated and legacy aliases
Andrii Nakryiko [Tue, 16 Aug 2022 00:19:28 +0000 (17:19 -0700)]
libbpf: Clean up deprecated and legacy aliases

Remove three missed deprecated APIs that were aliased to new APIs:
bpf_object__unload, bpf_prog_attach_xattr and btf__load.

Also move legacy API libbpf_find_kernel_btf (aliased to
btf__load_vmlinux_btf) into libbpf_legacy.h.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Hao Luo <haoluo@google.com>
Link: https://lore.kernel.org/bpf/20220816001929.369487-4-andrii@kernel.org
2 years agolibbpf: Streamline bpf_attr and perf_event_attr initialization
Andrii Nakryiko [Tue, 16 Aug 2022 00:19:27 +0000 (17:19 -0700)]
libbpf: Streamline bpf_attr and perf_event_attr initialization

Make sure that entire libbpf code base is initializing bpf_attr and
perf_event_attr with memset(0). Also for bpf_attr make sure we
clear and pass to kernel only relevant parts of bpf_attr. bpf_attr is
a huge union of independent sub-command attributes, so there is no need
to clear and pass entire union bpf_attr, which over time grows quite
a lot and for most commands this growth is completely irrelevant.

Few cases where we were relying on compiler initialization of BPF UAPI
structs (like bpf_prog_info, bpf_map_info, etc) with `= {};` were
switched to memset(0) pattern for future-proofing.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Hao Luo <haoluo@google.com>
Link: https://lore.kernel.org/bpf/20220816001929.369487-3-andrii@kernel.org
2 years agolibbpf: Fix potential NULL dereference when parsing ELF
Andrii Nakryiko [Tue, 16 Aug 2022 00:19:26 +0000 (17:19 -0700)]
libbpf: Fix potential NULL dereference when parsing ELF

Fix if condition filtering empty ELF sections to prevent NULL
dereference.

Fixes: 47ea7417b074 ("libbpf: Skip empty sections in bpf_object__init_global_data_maps")
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Hao Luo <haoluo@google.com>
Link: https://lore.kernel.org/bpf/20220816001929.369487-2-andrii@kernel.org
2 years agoMerge branch 'net-dsa-bcm_sf2-utilize-phylink-for-all-ports'
Jakub Kicinski [Wed, 17 Aug 2022 17:55:06 +0000 (10:55 -0700)]
Merge branch 'net-dsa-bcm_sf2-utilize-phylink-for-all-ports'

Florian Fainelli says:

====================
net: dsa: bcm_sf2: Utilize PHYLINK for all ports

This patch series has the bcm_sf2 driver utilize PHYLINK to configure
the CPU port link parameters to unify the configuration and pave the way
for DSA to utilize PHYLINK for all ports in the future.

Tested on BCM7445 and BCM7278
====================

Link: https://lore.kernel.org/r/20220815175009.2681932-1-f.fainelli@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2 years agonet: dsa: bcm_sf2: Have PHYLINK configure CPU/IMP port(s)
Florian Fainelli [Mon, 15 Aug 2022 17:50:09 +0000 (10:50 -0700)]
net: dsa: bcm_sf2: Have PHYLINK configure CPU/IMP port(s)

Remove the artificial limitations imposed upon
bcm_sf2_sw_mac_link_{up,down} and allow us to override the link
parameters for IMP port(s) as well as regular ports by accounting for
the special differences that exist there.

Remove the code that did override the link parameters in
bcm_sf2_imp_setup().

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2 years agonet: dsa: bcm_sf2: Introduce helper for port override offset
Florian Fainelli [Mon, 15 Aug 2022 17:50:08 +0000 (10:50 -0700)]
net: dsa: bcm_sf2: Introduce helper for port override offset

Depending upon the generation of switches, we have different offsets for
configuring a given port's status override where link parameters are
applied. Introduce a helper function that we re-use throughout the code
in order to let phylink callbacks configure the IMP/CPU port(s) in
subsequent changes.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2 years agonet: sfp: use simplified HWMON_CHANNEL_INFO macro
Beniamin Sandu [Sat, 13 Aug 2022 20:46:58 +0000 (23:46 +0300)]
net: sfp: use simplified HWMON_CHANNEL_INFO macro

This makes the code look cleaner and easier to read.

Signed-off-by: Beniamin Sandu <beniaminsandu@gmail.com>
Link: https://lore.kernel.org/r/20220813204658.848372-1-beniaminsandu@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2 years agoselftests/bpf: Tests libbpf autoattach APIs
Hao Luo [Tue, 16 Aug 2022 23:40:12 +0000 (16:40 -0700)]
selftests/bpf: Tests libbpf autoattach APIs

Adds test for libbpf APIs that toggle bpf program auto-attaching.

Signed-off-by: Hao Luo <haoluo@google.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20220816234012.910255-2-haoluo@google.com
2 years agolibbpf: Allows disabling auto attach
Hao Luo [Tue, 16 Aug 2022 23:40:11 +0000 (16:40 -0700)]
libbpf: Allows disabling auto attach

Adds libbpf APIs for disabling auto-attach for individual functions.
This is motivated by the use case of cgroup iter [1]. Some iter
types require their parameters to be non-zero, therefore applying
auto-attach on them will fail. With these two new APIs, users who
want to use auto-attach and these types of iters can disable
auto-attach on the program and perform manual attach.

[1] https://lore.kernel.org/bpf/CAEf4BzZ+a2uDo_t6kGBziqdz--m2gh2_EUwkGLDtMd65uwxUjA@mail.gmail.com/

Signed-off-by: Hao Luo <haoluo@google.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20220816234012.910255-1-haoluo@google.com
2 years agoMerge branch 'wwan-t7xx-fw-flashing-and-coredump-support'
David S. Miller [Wed, 17 Aug 2022 10:53:53 +0000 (11:53 +0100)]
Merge branch 'wwan-t7xx-fw-flashing-and-coredump-support'

M Chetan Kumar says:

====================
net: wwan: t7xx: fw flashing & coredump support

This patch series brings-in the support for FM350 wwan device firmware
flashing & coredump collection using devlink interface.

Below is the high level description of individual patches.
Refer to individual patch commit message for details.

PATCH1:  Enables AP CLDMA communication for firmware flashing &
coredump collection.

PATCH2: Enables the infrastructure & queue configuration required
for early ports enumeration.

PATCH3: Implements device reset and rescan logic required to enter
or exit fastboot mode.

PATCH4: Implements devlink interface & uses the fastboot protocol for
fw flashing and coredump collection.

PATCH5: t7xx devlink commands documentation.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
2 years agonet: wwan: t7xx: Devlink documentation
M Chetan Kumar [Tue, 16 Aug 2022 04:24:17 +0000 (09:54 +0530)]
net: wwan: t7xx: Devlink documentation

Document the t7xx devlink commands usage for fw flashing &
coredump collection.

Refer to t7xx.rst file for details.

Signed-off-by: M Chetan Kumar <m.chetan.kumar@linux.intel.com>
Signed-off-by: Devegowda Chandrashekar <chandrashekar.devegowda@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2 years agonet: wwan: t7xx: Enable devlink based fw flashing and coredump collection
M Chetan Kumar [Tue, 16 Aug 2022 04:24:05 +0000 (09:54 +0530)]
net: wwan: t7xx: Enable devlink based fw flashing and coredump collection

This patch brings-in support for t7xx wwan device firmware flashing &
coredump collection using devlink.

Driver Registers with Devlink framework.
Implements devlink ops flash_update callback that programs modem firmware.
Creates region & snapshot required for device coredump log collection.
On early detection of wwan device in fastboot mode driver sets up CLDMA0 HW
tx/rx queues for raw data transfer then registers with devlink framework.
Upon receiving firmware image & partition details driver sends fastboot
commands for flashing the firmware.

In this flow the fastboot command & response gets exchanged between driver
and device. Once firmware flashing is success completion status is reported
to user space application.

Below is the devlink command usage for firmware flashing

$devlink dev flash pci/$BDF file ABC.img component ABC

Note: ABC.img is the firmware to be programmed to "ABC" partition.

In case of coredump collection when wwan device encounters an exception
it reboots & stays in fastboot mode for coredump collection by host driver.
On detecting exception state driver collects the core dump, creates the
devlink region & reports an event to user space application for dump
collection. The user space application invokes devlink region read command
for dump collection.

Below are the devlink commands used for coredump collection.

devlink region new pci/$BDF/mr_dump
devlink region read pci/$BDF/mr_dump snapshot $ID address $ADD length $LEN
devlink region del pci/$BDF/mr_dump snapshot $ID

Signed-off-by: M Chetan Kumar <m.chetan.kumar@linux.intel.com>
Signed-off-by: Devegowda Chandrashekar <chandrashekar.devegowda@intel.com>
Signed-off-by: Mishra Soumya Prakash <soumya.prakash.mishra@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2 years agonet: wwan: t7xx: PCIe reset rescan
Haijun Liu [Tue, 16 Aug 2022 04:23:53 +0000 (09:53 +0530)]
net: wwan: t7xx: PCIe reset rescan

PCI rescan module implements "rescan work queue". In firmware flashing
or coredump collection procedure WWAN device is programmed to boot in
fastboot mode and a work item is scheduled for removal & detection.
The WWAN device is reset using APCI call as part driver removal flow.
Work queue rescans pci bus at fixed interval for device detection,
later when device is detect work queue exits.

Signed-off-by: Haijun Liu <haijun.liu@mediatek.com>
Co-developed-by: Madhusmita Sahu <madhusmita.sahu@intel.com>
Signed-off-by: Madhusmita Sahu <madhusmita.sahu@intel.com>
Signed-off-by: Ricardo Martinez <ricardo.martinez@linux.intel.com>
Signed-off-by: M Chetan Kumar <m.chetan.kumar@linux.intel.com>
Signed-off-by: Devegowda Chandrashekar <chandrashekar.devegowda@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2 years agonet: wwan: t7xx: Infrastructure for early port configuration
Haijun Liu [Tue, 16 Aug 2022 04:23:40 +0000 (09:53 +0530)]
net: wwan: t7xx: Infrastructure for early port configuration

To support cases such as FW update or Core dump, the t7xx device
is capable of signaling the host that a special port needs
to be created before the handshake phase.

This patch adds the infrastructure required to create the
early ports which also requires a different configuration of
CLDMA queues.

Signed-off-by: Haijun Liu <haijun.liu@mediatek.com>
Co-developed-by: Madhusmita Sahu <madhusmita.sahu@intel.com>
Signed-off-by: Madhusmita Sahu <madhusmita.sahu@intel.com>
Signed-off-by: Ricardo Martinez <ricardo.martinez@linux.intel.com>
Signed-off-by: Devegowda Chandrashekar <chandrashekar.devegowda@intel.com>
Signed-off-by: M Chetan Kumar <m.chetan.kumar@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2 years agonet: wwan: t7xx: Add AP CLDMA
Haijun Liu [Tue, 16 Aug 2022 04:23:28 +0000 (09:53 +0530)]
net: wwan: t7xx: Add AP CLDMA

The t7xx device contains two Cross Layer DMA (CLDMA) interfaces to
communicate with AP and Modem processors respectively. So far only
MD-CLDMA was being used, this patch enables AP-CLDMA.

Rename small Application Processor (sAP) to AP.

Signed-off-by: Haijun Liu <haijun.liu@mediatek.com>
Co-developed-by: Madhusmita Sahu <madhusmita.sahu@intel.com>
Signed-off-by: Madhusmita Sahu <madhusmita.sahu@intel.com>
Signed-off-by: Moises Veleta <moises.veleta@linux.intel.com>
Signed-off-by: Devegowda Chandrashekar <chandrashekar.devegowda@intel.com>
Signed-off-by: M Chetan Kumar <m.chetan.kumar@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2 years agonet: phy: broadcom: Implement suspend/resume for AC131 and BCM5241
Florian Fainelli [Mon, 15 Aug 2022 19:07:47 +0000 (12:07 -0700)]
net: phy: broadcom: Implement suspend/resume for AC131 and BCM5241

Implement the suspend/resume procedure for the Broadcom AC131 and BCM5241 type
of PHYs (10/100 only) by entering the standard power down followed by the
proprietary standby mode in the auxiliary mode 4 shadow register. On resume,
the PHY software reset is enough to make it come out of standby mode so we can
utilize brcm_fet_config_init() as the resume hook.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2 years agoMerge branch '100GbE' of git://git.kernel.org/pub/scm/linux/kernel/git/tnguy/nex
David S. Miller [Wed, 17 Aug 2022 09:20:45 +0000 (10:20 +0100)]
Merge branch '100GbE' of git://git./linux/kernel/git/tnguy/nex
t-queue

Tony Nguyen says:

====================
ice: detect and report PTP timestamp issues

Jacob Keller says:

This series fixes a few small issues with the cached PTP Hardware Clock
timestamp used for timestamp extension. It also introduces extra checks to
help detect issues with this logic, such as if the cached timestamp is not
updated within the 2 second window.

This introduces a few statistics similar to the ones already available in
other Intel drivers, including tx_hwtstamp_skipped and tx_hwtstamp_timeouts.

It is intended to aid in debugging issues we're seeing with some setups
which might be related to incorrect cached timestamp values.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>