Merge remote-tracking branch 'torvalds/master' into perf/core

To pick up fixes from perf/urgent.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

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

include/linux/netdevice.h
net/core/dev.c
6510ea973d8d ("net: Use this_cpu_inc() to increment net->core_stats")
794c24e9921f ("net-c

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

include/linux/netdevice.h
net/core/dev.c
6510ea973d8d ("net: Use this_cpu_inc() to increment net->core_stats")
794c24e9921f ("net-core: rx_otherhost_dropped to core_stats")
https://lore.kernel.org/all/20220428111903.5f4304e0@canb.auug.org.au/

drivers/net/wan/cosa.c
d48fea8401cf ("net: cosa: fix error check return value of register_chrdev()")
89fbca3307d4 ("net: wan: remove support for COSA and SRP synchronous serial boards")
https://lore.kernel.org/all/20220428112130.1f689e5e@canb.auug.org.au/

Signed-off-by: Jakub Kicinski <kuba@kernel.org>

show more ...

Merge tag 'net-5.18-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

Pull networking fixes from Jakub Kicinski:
"Including fixes from bluetooth, bpf and netfilter.

Current releas

Merge tag 'net-5.18-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

Pull networking fixes from Jakub Kicinski:
"Including fixes from bluetooth, bpf and netfilter.

Current release - new code bugs:

- bridge: switchdev: check br_vlan_group() return value

- use this_cpu_inc() to increment net->core_stats, fix preempt-rt

Previous releases - regressions:

- eth: stmmac: fix write to sgmii_adapter_base

Previous releases - always broken:

- netfilter: nf_conntrack_tcp: re-init for syn packets only,
resolving issues with TCP fastopen

- tcp: md5: fix incorrect tcp_header_len for incoming connections

- tcp: fix F-RTO may not work correctly when receiving DSACK

- tcp: ensure use of most recently sent skb when filling rate samples

- tcp: fix potential xmit stalls caused by TCP_NOTSENT_LOWAT

- virtio_net: fix wrong buf address calculation when using xdp

- xsk: fix forwarding when combining copy mode with busy poll

- xsk: fix possible crash when multiple sockets are created

- bpf: lwt: fix crash when using bpf_skb_set_tunnel_key() from
bpf_xmit lwt hook

- sctp: null-check asoc strreset_chunk in sctp_generate_reconf_event

- wireguard: device: check for metadata_dst with skb_valid_dst()

- netfilter: update ip6_route_me_harder to consider L3 domain

- gre: make o_seqno start from 0 in native mode

- gre: switch o_seqno to atomic to prevent races in collect_md mode

Misc:

- add Eric Dumazet to networking maintainers

- dt: dsa: realtek: remove realtek,rtl8367s string

- netfilter: flowtable: Remove the empty file"

* tag 'net-5.18-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (65 commits)
tcp: fix F-RTO may not work correctly when receiving DSACK
Revert "ibmvnic: Add ethtool private flag for driver-defined queue limits"
net: enetc: allow tc-etf offload even with NETIF_F_CSUM_MASK
ixgbe: ensure IPsec VF<->PF compatibility
MAINTAINERS: Update BNXT entry with firmware files
netfilter: nft_socket: only do sk lookups when indev is available
net: fec: add missing of_node_put() in fec_enet_init_stop_mode()
bnx2x: fix napi API usage sequence
tls: Skip tls_append_frag on zero copy size
Add Eric Dumazet to networking maintainers
netfilter: conntrack: fix udp offload timeout sysctl
netfilter: nf_conntrack_tcp: re-init for syn packets only
net: dsa: lantiq_gswip: Don't set GSWIP_MII_CFG_RMII_CLK
net: Use this_cpu_inc() to increment net->core_stats
Bluetooth: hci_sync: Cleanup hci_conn if it cannot be aborted
Bluetooth: hci_event: Fix creating hci_conn object on error status
Bluetooth: hci_event: Fix checking for invalid handle on error status
ice: fix use-after-free when deinitializing mailbox snapshot
ice: wait 5 s for EMP reset after firmware flash
ice: Protect vf_state check by cfg_lock in ice_vc_process_vf_msg()
...

show more ...

Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next

Daniel Borkmann says:

====================
pull-request: bpf-next 2022-04-27

We've added 85 non-merge commits during the last 18

Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next

Daniel Borkmann says:

====================
pull-request: bpf-next 2022-04-27

We've added 85 non-merge commits during the last 18 day(s) which contain
a total of 163 files changed, 4499 insertions(+), 1521 deletions(-).

The main changes are:

1) Teach libbpf to enhance BPF verifier log with human-readable and relevant
information about failed CO-RE relocations, from Andrii Nakryiko.

2) Add typed pointer support in BPF maps and enable it for unreferenced pointers
(via probe read) and referenced ones that can be passed to in-kernel helpers,
from Kumar Kartikeya Dwivedi.

3) Improve xsk to break NAPI loop when rx queue gets full to allow for forward
progress to consume descriptors, from Maciej Fijalkowski & Björn Töpel.

4) Fix a small RCU read-side race in BPF_PROG_RUN routines which dereferenced
the effective prog array before the rcu_read_lock, from Stanislav Fomichev.

5) Implement BPF atomic operations for RV64 JIT, and add libbpf parsing logic
for USDT arguments under riscv{32,64}, from Pu Lehui.

6) Implement libbpf parsing of USDT arguments under aarch64, from Alan Maguire.

7) Enable bpftool build for musl and remove nftw with FTW_ACTIONRETVAL usage
so it can be shipped under Alpine which is musl-based, from Dominique Martinet.

8) Clean up {sk,task,inode} local storage trace RCU handling as they do not
need to use call_rcu_tasks_trace() barrier, from KP Singh.

9) Improve libbpf API documentation and fix error return handling of various
API functions, from Grant Seltzer.

10) Enlarge offset check for bpf_skb_{load,store}_bytes() helpers given data
length of frags + frag_list may surpass old offset limit, from Liu Jian.

11) Various improvements to prog_tests in area of logging, test execution
and by-name subtest selection, from Mykola Lysenko.

12) Simplify map_btf_id generation for all map types by moving this process
to build time with help of resolve_btfids infra, from Menglong Dong.

13) Fix a libbpf bug in probing when falling back to legacy bpf_probe_read*()
helpers; the probing caused always to use old helpers, from Runqing Yang.

14) Add support for ARCompact and ARCv2 platforms for libbpf's PT_REGS
tracing macros, from Vladimir Isaev.

15) Cleanup BPF selftests to remove old & unneeded rlimit code given kernel
switched to memcg-based memory accouting a while ago, from Yafang Shao.

16) Refactor of BPF sysctl handlers to move them to BPF core, from Yan Zhu.

17) Fix BPF selftests in two occasions to work around regressions caused by latest
LLVM to unblock CI until their fixes are worked out, from Yonghong Song.

18) Misc cleanups all over the place, from various others.

* https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next: (85 commits)
selftests/bpf: Add libbpf's log fixup logic selftests
libbpf: Fix up verifier log for unguarded failed CO-RE relos
libbpf: Simplify bpf_core_parse_spec() signature
libbpf: Refactor CO-RE relo human description formatting routine
libbpf: Record subprog-resolved CO-RE relocations unconditionally
selftests/bpf: Add CO-RE relos and SEC("?...") to linked_funcs selftests
libbpf: Avoid joining .BTF.ext data with BPF programs by section name
libbpf: Fix logic for finding matching program for CO-RE relocation
libbpf: Drop unhelpful "program too large" guess
libbpf: Fix anonymous type check in CO-RE logic
bpf: Compute map_btf_id during build time
selftests/bpf: Add test for strict BTF type check
selftests/bpf: Add verifier tests for kptr
selftests/bpf: Add C tests for kptr
libbpf: Add kptr type tag macros to bpf_helpers.h
bpf: Make BTF type match stricter for release arguments
bpf: Teach verifier about kptr_get kfunc helpers
bpf: Wire up freeing of referenced kptr
bpf: Populate pairs of btf_id and destructor kfunc in btf
bpf: Adapt copy_map_value for multiple offset case
...
====================

Link: https://lore.kernel.org/r/20220427224758.20976-1-daniel@iogearbox.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

show more ...

Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf

Daniel Borkmann says:

====================
pull-request: bpf 2022-04-27

We've added 5 non-merge commits during the last 20 day(s) whic

Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf

Daniel Borkmann says:

====================
pull-request: bpf 2022-04-27

We've added 5 non-merge commits during the last 20 day(s) which contain
a total of 6 files changed, 34 insertions(+), 12 deletions(-).

The main changes are:

1) Fix xsk sockets when rx and tx are separately bound to the same umem, also
fix xsk copy mode combined with busy poll, from Maciej Fijalkowski.

2) Fix BPF tunnel/collect_md helpers with bpf_xmit lwt hook usage which triggered
a crash due to invalid metadata_dst access, from Eyal Birger.

3) Fix release of page pool in XDP live packet mode, from Toke Høiland-Jørgensen.

4) Fix potential NULL pointer dereference in kretprobes, from Adam Zabrocki.

(Masami & Steven preferred this small fix to be routed via bpf tree given it's
follow-up fix to Masami's rethook work that went via bpf earlier, too.)

* https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf:
xsk: Fix possible crash when multiple sockets are created
kprobes: Fix KRETPROBES when CONFIG_KRETPROBE_ON_RETHOOK is set
bpf, lwt: Fix crash when using bpf_skb_set_tunnel_key() from bpf_xmit lwt hook
bpf: Fix release of page_pool in BPF_PROG_RUN in test runner
xsk: Fix l2fwd for copy mode + busy poll combo
====================

Link: https://lore.kernel.org/r/20220427212748.9576-1-daniel@iogearbox.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

show more ...

Merge branch 'Introduce typed pointer support in BPF maps'

Kumar Kartikeya Dwivedi says:

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

This set enables storing pointers of a certain type in BPF map, and extends the
verifi

Merge branch 'Introduce typed pointer support in BPF maps'

Kumar Kartikeya Dwivedi says:

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

This set enables storing pointers of a certain type in BPF map, and extends the
verifier to enforce type safety and lifetime correctness properties.

The infrastructure being added is generic enough for allowing storing any kind
of pointers whose type is available using BTF (user or kernel) in the future
(e.g. strongly typed memory allocation in BPF program), which are internally
tracked in the verifier as PTR_TO_BTF_ID, but for now the series limits them to
two kinds of pointers obtained from the kernel.

Obviously, use of this feature depends on map BTF.

1. Unreferenced kernel pointer

In this case, there are very few restrictions. The pointer type being stored
must match the type declared in the map value. However, such a pointer when
loaded from the map can only be dereferenced, but not passed to any in-kernel
helpers or kernel functions available to the program. This is because while the
verifier's exception handling mechanism coverts BPF_LDX to PROBE_MEM loads,
which are then handled specially by the JIT implementation, the same liberty is
not available to accesses inside the kernel. The pointer by the time it is
passed into a helper has no lifetime related guarantees about the object it is
pointing to, and may well be referencing invalid memory.

2. Referenced kernel pointer

This case imposes a lot of restrictions on the programmer, to ensure safety. To
transfer the ownership of a reference in the BPF program to the map, the user
must use the bpf_kptr_xchg helper, which returns the old pointer contained in
the map, as an acquired reference, and releases verifier state for the
referenced pointer being exchanged, as it moves into the map.

This a normal PTR_TO_BTF_ID that can be used with in-kernel helpers and kernel
functions callable by the program.

However, if BPF_LDX is used to load a referenced pointer from the map, it is
still not permitted to pass it to in-kernel helpers or kernel functions. To
obtain a reference usable with helpers, the user must invoke a kfunc helper
which returns a usable reference (which also must be eventually released before
BPF_EXIT, or moved into a map).

Since the load of the pointer (preserving data dependency ordering) must happen
inside the RCU read section, the kfunc helper will take a pointer to the map
value, which must point to the actual pointer of the object whose reference is
to be raised. The type will be verified from the BTF information of the kfunc,
as the prototype must be:

T *func(T **, ... /* other arguments */);

Then, the verifier checks whether pointer at offset of the map value points to
the type T, and permits the call.

This convention is followed so that such helpers may also be called from
sleepable BPF programs, where RCU read lock is not necessarily held in the BPF
program context, hence necessiating the need to pass in a pointer to the actual
pointer to perform the load inside the RCU read section.

Notes
-----

* C selftests require https://reviews.llvm.org/D119799 to pass.
* Unlike BPF timers, kptr is not reset or freed on map_release_uref.
* Referenced kptr storage is always treated as unsigned long * on kernel side,
as BPF side cannot mutate it. The storage (8 bytes) is sufficient for both
32-bit and 64-bit platforms.
* Use of WRITE_ONCE to reset unreferenced kptr on 32-bit systems is fine, as
the actual pointer is always word sized, so the store tearing into two 32-bit
stores won't be a problem as the other half is always zeroed out.

Changelog:
----------
v5 -> v6
v5: https://lore.kernel.org/bpf/20220415160354.1050687-1-memxor@gmail.com

* Address comments from Alexei
* Drop 'Revisit stack usage' comment
* Rename off_btf to kernel_btf
* Add comment about searching using type from map BTF
* Do kmemdup + btf_get instead of get + kmemdup + put
* Add comment for btf_struct_ids_match
* Add comment for assigning non-zero id for mark_ptr_or_null_reg
* Rename PTR_RELEASE to OBJ_RELEASE
* Rename BPF_MAP_OFF_DESC_TYPE_XXX_KPTR to BPF_KPTR_XXX
* Remove unneeded likely/unlikely in cold functions
* Fix other misc nits
* Keep release_regno instead of replacing with bool + regno
* Add a patch to prevent type match for first member when off == 0 for
release functions (kfunc + BPF helpers)
* Guard kptr/kptr_ref definition in libbpf header with __has_attribute
to prevent selftests compilation error with old clang not support
type tags

v4 -> v5
v4: https://lore.kernel.org/bpf/20220409093303.499196-1-memxor@gmail.com

* Address comments from Joanne
* Move __btf_member_bit_offset before strcmp
* Move strcmp conditional on name to unref kptr patch
* Directly return from btf_find_struct in patch 1
* Use enum btf_field_type vs int field_type
* Put btf and btf_id in off_desc in named struct 'kptr'
* Switch order for BTF_FIELD_IGNORE check
* Drop dead tab->nr_off = 0 store
* Use i instead of tab->nr_off to btf_put on failure
* Replace kzalloc + memcpy with kmemdup (kernel test robot)
* Reject both BPF_F_RDONLY_PROG and BPF_F_WRONLY_PROG
* Add logging statement for reject BPF_MODE(insn->code) != BPF_MEM
* Rename off_desc -> kptr_off_desc in check_mem_access
* Drop check for err, fallthrough to end of function
* Remove is_release_function, use meta.release_regno to detect release
function, release reference state, and remove check_release_regno
* Drop off_desc->flags, use off_desc->type
* Update comment for ARG_PTR_TO_KPTR
* Distinguish between direct/indirect access to kptr
* Drop check_helper_mem_access from process_kptr_func, check_mem_reg in kptr_get
* Add verifier test for helper accessing kptr indirectly
* Fix other misc nits, add Acked-by for patch 2

v3 -> v4
v3: https://lore.kernel.org/bpf/20220320155510.671497-1-memxor@gmail.com

* Use btf_parse_kptrs, plural kptrs naming (Joanne, Andrii)
* Remove unused parameters in check_map_kptr_access (Joanne)
* Handle idx < info_cnt kludge using tmp variable (Andrii)
* Validate tags always precede modifiers in BTF (Andrii)
* Split out into https://lore.kernel.org/bpf/20220406004121.282699-1-memxor@gmail.com
* Store u32 type_id in btf_field_info (Andrii)
* Use base_type in map_kptr_match_type (Andrii)
* Free kptr_off_tab when not bpf_capable (Martin)
* Use PTR_RELEASE flag instead of bools in bpf_func_proto (Joanne)
* Drop extra reg->off and reg->ref_obj_id checks in map_kptr_match_type (Martin)
* Use separate u32 and u8 arrays for offs and sizes in off_arr (Andrii)
* Simplify and remove map->value_size sentinel in copy_map_value (Andrii)
* Use sort_r to keep both arrays in sync while sorting (Andrii)
* Rename check_and_free_timers_and_kptr to check_and_free_fields (Andrii)
* Move dtor prototype checks to registration phase (Alexei)
* Use ret variable for checking ASSERT_XXX, use shorter strings (Andrii)
* Fix missing checks for other maps (Jiri)
* Fix various other nits, and bugs noticed during self review

v2 -> v3
v2: https://lore.kernel.org/bpf/20220317115957.3193097-1-memxor@gmail.com

* Address comments from Alexei
* Set name, sz, align in btf_find_field
* Do idx >= info_cnt check in caller of btf_find_field_*
* Use extra element in the info_arr to make this safe
* Remove while loop, reject extra tags
* Remove cases of defensive programming
* Move bpf_capable() check to map_check_btf
* Put check_ptr_off_reg reordering hunk into separate patch
* Warn for ref_ptr once
* Make the meta.ref_obj_id == 0 case simpler to read
* Remove kptr_percpu and kptr_user support, remove their tests
* Store size of field at offset in off_arr
* Fix BPF_F_NO_PREALLOC set wrongly for hash map in C selftest
* Add missing check_mem_reg call for kptr_get kfunc arg#0 check

v1 -> v2
v1: https://lore.kernel.org/bpf/20220220134813.3411982-1-memxor@gmail.com

* Address comments from Alexei
* Rename bpf_btf_find_by_name_kind_all to bpf_find_btf_id
* Reduce indentation level in that function
* Always take reference regardless of module or vmlinux BTF
* Also made it the same for btf_get_module_btf
* Use kptr, kptr_ref, kptr_percpu, kptr_user type tags
* Don't reserve tag namespace
* Refactor btf_find_field to be side effect free, allocate and populate
kptr_off_tab in caller
* Move module reference to dtor patch
* Remove support for BPF_XCHG, BPF_CMPXCHG insn
* Introduce bpf_kptr_xchg helper
* Embed offset array in struct bpf_map, populate and sort it once
* Adjust copy_map_value to memcpy directly using this offset array
* Removed size member from offset array to save space
* Fix some problems pointed out by kernel test robot
* Tidy selftests
* Lots of other minor fixes
====================

Signed-off-by: Alexei Starovoitov <ast@kernel.org>

show more ...

selftests/bpf: Add test for strict BTF type check

Ensure that the edge case where first member type was matched
successfully even if it didn't match BTF type of register is caught and
rejected by th

selftests/bpf: Add test for strict BTF type check

Ensure that the edge case where first member type was matched
successfully even if it didn't match BTF type of register is caught and
rejected by the verifier.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20220424214901.2743946-14-memxor@gmail.com

show more ...

selftests/bpf: Add verifier tests for kptr

Reuse bpf_prog_test functions to test the support for PTR_TO_BTF_ID in
BPF map case, including some tests that verify implementation sanity and
corner case

selftests/bpf: Add verifier tests for kptr

Reuse bpf_prog_test functions to test the support for PTR_TO_BTF_ID in
BPF map case, including some tests that verify implementation sanity and
corner cases.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20220424214901.2743946-13-memxor@gmail.com

show more ...

Merge tag 'asoc-fix-v5.18-rc3' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into for-linus

ASoC: Fixes for v5.18

A collection of fixes that came in since the merge window, plus

Merge tag 'asoc-fix-v5.18-rc3' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into for-linus

ASoC: Fixes for v5.18

A collection of fixes that came in since the merge window, plus one new
device ID for an x86 laptop. Nothing that really stands out with
particularly big impact outside of the affected device.

show more ...

Merge branch 'topic/cs35l41' into for-next

Pull CS35L41 codec updates

Signed-off-by: Takashi Iwai <tiwai@suse.de>

Merge drm/drm-next into drm-intel-gt-next

Pull in TTM changes needed for DG2 CCS enabling from Ram.

Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

bpf: Fix release of page_pool in BPF_PROG_RUN in test runner

The live packet mode in BPF_PROG_RUN allocates a page_pool instance for
each test run instance and uses it for the packet data. On setup

bpf: Fix release of page_pool in BPF_PROG_RUN in test runner

The live packet mode in BPF_PROG_RUN allocates a page_pool instance for
each test run instance and uses it for the packet data. On setup it creates
the page_pool, and calls xdp_reg_mem_model() to allow pages to be returned
properly from the XDP data path. However, xdp_reg_mem_model() also raises
the reference count of the page_pool itself, so the single
page_pool_destroy() count on teardown was not enough to actually release
the pool. To fix this, add an additional xdp_unreg_mem_model() call on
teardown.

Fixes: b530e9e1063e ("bpf: Add "live packet" mode for XDP in BPF_PROG_RUN")
Reported-by: Freysteinn Alfredsson <freysteinn.alfredsson@kau.se>
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20220409213053.3117305-1-toke@redhat.com

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Merge drm/drm-next into drm-intel-next

Sync up with v5.18-rc1, in particular to get 5e3094cfd9fb
("drm/i915/xehpsdv: Add has_flat_ccs to device info").

Signed-off-by: Jani Nikula <jani.nikula@intel

Merge drm/drm-next into drm-intel-next

Sync up with v5.18-rc1, in particular to get 5e3094cfd9fb
("drm/i915/xehpsdv: Add has_flat_ccs to device info").

Signed-off-by: Jani Nikula <jani.nikula@intel.com>

show more ...

Merge drm/drm-fixes into drm-misc-fixes

Let's start the 5.18 fixes cycle.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>

Merge drm/drm-next into drm-misc-next

Let's start the 5.19 development cycle.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>

Merge tag 'net-next-5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next

Pull networking updates from Jakub Kicinski:
"The sprinkling of SPI drivers is because we added a new one

Merge tag 'net-next-5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next

Pull networking updates from Jakub Kicinski:
"The sprinkling of SPI drivers is because we added a new one and Mark
sent us a SPI driver interface conversion pull request.

Core
----

- Introduce XDP multi-buffer support, allowing the use of XDP with
jumbo frame MTUs and combination with Rx coalescing offloads (LRO).

- Speed up netns dismantling (5x) and lower the memory cost a little.
Remove unnecessary per-netns sockets. Scope some lists to a netns.
Cut down RCU syncing. Use batch methods. Allow netdev registration
to complete out of order.

- Support distinguishing timestamp types (ingress vs egress) and
maintaining them across packet scrubbing points (e.g. redirect).

- Continue the work of annotating packet drop reasons throughout the
stack.

- Switch netdev error counters from an atomic to dynamically
allocated per-CPU counters.

- Rework a few preempt_disable(), local_irq_save() and busy waiting
sections problematic on PREEMPT_RT.

- Extend the ref_tracker to allow catching use-after-free bugs.

BPF
---

- Introduce "packing allocator" for BPF JIT images. JITed code is
marked read only, and used to be allocated at page granularity.
Custom allocator allows for more efficient memory use, lower iTLB
pressure and prevents identity mapping huge pages from getting
split.

- Make use of BTF type annotations (e.g. __user, __percpu) to enforce
the correct probe read access method, add appropriate helpers.

- Convert the BPF preload to use light skeleton and drop the
user-mode-driver dependency.

- Allow XDP BPF_PROG_RUN test infra to send real packets, enabling
its use as a packet generator.

- Allow local storage memory to be allocated with GFP_KERNEL if
called from a hook allowed to sleep.

- Introduce fprobe (multi kprobe) to speed up mass attachment (arch
bits to come later).

- Add unstable conntrack lookup helpers for BPF by using the BPF
kfunc infra.

- Allow cgroup BPF progs to return custom errors to user space.

- Add support for AF_UNIX iterator batching.

- Allow iterator programs to use sleepable helpers.

- Support JIT of add, and, or, xor and xchg atomic ops on arm64.

- Add BTFGen support to bpftool which allows to use CO-RE in kernels
without BTF info.

- Large number of libbpf API improvements, cleanups and deprecations.

Protocols
---------

- Micro-optimize UDPv6 Tx, gaining up to 5% in test on dummy netdev.

- Adjust TSO packet sizes based on min_rtt, allowing very low latency
links (data centers) to always send full-sized TSO super-frames.

- Make IPv6 flow label changes (AKA hash rethink) more configurable,
via sysctl and setsockopt. Distinguish between server and client
behavior.

- VxLAN support to "collect metadata" devices to terminate only
configured VNIs. This is similar to VLAN filtering in the bridge.

- Support inserting IPv6 IOAM information to a fraction of frames.

- Add protocol attribute to IP addresses to allow identifying where
given address comes from (kernel-generated, DHCP etc.)

- Support setting socket and IPv6 options via cmsg on ping6 sockets.

- Reject mis-use of ECN bits in IP headers as part of DSCP/TOS.
Define dscp_t and stop taking ECN bits into account in fib-rules.

- Add support for locked bridge ports (for 802.1X).

- tun: support NAPI for packets received from batched XDP buffs,
doubling the performance in some scenarios.

- IPv6 extension header handling in Open vSwitch.

- Support IPv6 control message load balancing in bonding, prevent
neighbor solicitation and advertisement from using the wrong port.
Support NS/NA monitor selection similar to existing ARP monitor.

- SMC
- improve performance with TCP_CORK and sendfile()
- support auto-corking
- support TCP_NODELAY

- MCTP (Management Component Transport Protocol)
- add user space tag control interface
- I2C binding driver (as specified by DMTF DSP0237)

- Multi-BSSID beacon handling in AP mode for WiFi.

- Bluetooth:
- handle MSFT Monitor Device Event
- add MGMT Adv Monitor Device Found/Lost events

- Multi-Path TCP:
- add support for the SO_SNDTIMEO socket option
- lots of selftest cleanups and improvements

- Increase the max PDU size in CAN ISOTP to 64 kB.

Driver API
----------

- Add HW counters for SW netdevs, a mechanism for devices which
offload packet forwarding to report packet statistics back to
software interfaces such as tunnels.

- Select the default NIC queue count as a fraction of number of
physical CPU cores, instead of hard-coding to 8.

- Expose devlink instance locks to drivers. Allow device layer of
drivers to use that lock directly instead of creating their own
which always runs into ordering issues in devlink callbacks.

- Add header/data split indication to guide user space enabling of
TCP zero-copy Rx.

- Allow configuring completion queue event size.

- Refactor page_pool to enable fragmenting after allocation.

- Add allocation and page reuse statistics to page_pool.

- Improve Multiple Spanning Trees support in the bridge to allow
reuse of topologies across VLANs, saving HW resources in switches.

- DSA (Distributed Switch Architecture):
- replay and offload of host VLAN entries
- offload of static and local FDB entries on LAG interfaces
- FDB isolation and unicast filtering

New hardware / drivers
----------------------

- Ethernet:
- LAN937x T1 PHYs
- Davicom DM9051 SPI NIC driver
- Realtek RTL8367S, RTL8367RB-VB switch and MDIO
- Microchip ksz8563 switches
- Netronome NFP3800 SmartNICs
- Fungible SmartNICs
- MediaTek MT8195 switches

- WiFi:
- mt76: MediaTek mt7916
- mt76: MediaTek mt7921u USB adapters
- brcmfmac: Broadcom BCM43454/6

- Mobile:
- iosm: Intel M.2 7360 WWAN card

Drivers
-------

- Convert many drivers to the new phylink API built for split PCS
designs but also simplifying other cases.

- Intel Ethernet NICs:
- add TTY for GNSS module for E810T device
- improve AF_XDP performance
- GTP-C and GTP-U filter offload
- QinQ VLAN support

- Mellanox Ethernet NICs (mlx5):
- support xdp->data_meta
- multi-buffer XDP
- offload tc push_eth and pop_eth actions

- Netronome Ethernet NICs (nfp):
- flow-independent tc action hardware offload (police / meter)
- AF_XDP

- Other Ethernet NICs:
- at803x: fiber and SFP support
- xgmac: mdio: preamble suppression and custom MDC frequencies
- r8169: enable ASPM L1.2 if system vendor flags it as safe
- macb/gem: ZynqMP SGMII
- hns3: add TX push mode
- dpaa2-eth: software TSO
- lan743x: multi-queue, mdio, SGMII, PTP
- axienet: NAPI and GRO support

- Mellanox Ethernet switches (mlxsw):
- source and dest IP address rewrites
- RJ45 ports

- Marvell Ethernet switches (prestera):
- basic routing offload
- multi-chain TC ACL offload

- NXP embedded Ethernet switches (ocelot & felix):
- PTP over UDP with the ocelot-8021q DSA tagging protocol
- basic QoS classification on Felix DSA switch using dcbnl
- port mirroring for ocelot switches

- Microchip high-speed industrial Ethernet (sparx5):
- offloading of bridge port flooding flags
- PTP Hardware Clock

- Other embedded switches:
- lan966x: PTP Hardward Clock
- qca8k: mdio read/write operations via crafted Ethernet packets

- Qualcomm 802.11ax WiFi (ath11k):
- add LDPC FEC type and 802.11ax High Efficiency data in radiotap
- enable RX PPDU stats in monitor co-exist mode

- Intel WiFi (iwlwifi):
- UHB TAS enablement via BIOS
- band disablement via BIOS
- channel switch offload
- 32 Rx AMPDU sessions in newer devices

- MediaTek WiFi (mt76):
- background radar detection
- thermal management improvements on mt7915
- SAR support for more mt76 platforms
- MBSSID and 6 GHz band on mt7915

- RealTek WiFi:
- rtw89: AP mode
- rtw89: 160 MHz channels and 6 GHz band
- rtw89: hardware scan

- Bluetooth:
- mt7921s: wake on Bluetooth, SCO over I2S, wide-band-speed (WBS)

- Microchip CAN (mcp251xfd):
- multiple RX-FIFOs and runtime configurable RX/TX rings
- internal PLL, runtime PM handling simplification
- improve chip detection and error handling after wakeup"

* tag 'net-next-5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (2521 commits)
llc: fix netdevice reference leaks in llc_ui_bind()
drivers: ethernet: cpsw: fix panic when interrupt coaleceing is set via ethtool
ice: don't allow to run ice_send_event_to_aux() in atomic ctx
ice: fix 'scheduling while atomic' on aux critical err interrupt
net/sched: fix incorrect vlan_push_eth dest field
net: bridge: mst: Restrict info size queries to bridge ports
net: marvell: prestera: add missing destroy_workqueue() in prestera_module_init()
drivers: net: xgene: Fix regression in CRC stripping
net: geneve: add missing netlink policy and size for IFLA_GENEVE_INNER_PROTO_INHERIT
net: dsa: fix missing host-filtered multicast addresses
net/mlx5e: Fix build warning, detected write beyond size of field
iwlwifi: mvm: Don't fail if PPAG isn't supported
selftests/bpf: Fix kprobe_multi test.
Revert "rethook: x86: Add rethook x86 implementation"
Revert "arm64: rethook: Add arm64 rethook implementation"
Revert "powerpc: Add rethook support"
Revert "ARM: rethook: Add rethook arm implementation"
netdevice: add missing dm_private kdoc
net: bridge: mst: prevent NULL deref in br_mst_info_size()
selftests: forwarding: Use same VRF for port and VLAN upper
...

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Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next

Alexei Starovoitov says:

====================
pull-request: bpf-next 2022-03-21 v2

We've added 137 non-merge commits during the l

Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next

Alexei Starovoitov says:

====================
pull-request: bpf-next 2022-03-21 v2

We've added 137 non-merge commits during the last 17 day(s) which contain
a total of 143 files changed, 7123 insertions(+), 1092 deletions(-).

The main changes are:

1) Custom SEC() handling in libbpf, from Andrii.

2) subskeleton support, from Delyan.

3) Use btf_tag to recognize __percpu pointers in the verifier, from Hao.

4) Fix net.core.bpf_jit_harden race, from Hou.

5) Fix bpf_sk_lookup remote_port on big-endian, from Jakub.

6) Introduce fprobe (multi kprobe) _without_ arch bits, from Masami.
The arch specific bits will come later.

7) Introduce multi_kprobe bpf programs on top of fprobe, from Jiri.

8) Enable non-atomic allocations in local storage, from Joanne.

9) Various var_off ptr_to_btf_id fixed, from Kumar.

10) bpf_ima_file_hash helper, from Roberto.

11) Add "live packet" mode for XDP in BPF_PROG_RUN, from Toke.

* https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next: (137 commits)
selftests/bpf: Fix kprobe_multi test.
Revert "rethook: x86: Add rethook x86 implementation"
Revert "arm64: rethook: Add arm64 rethook implementation"
Revert "powerpc: Add rethook support"
Revert "ARM: rethook: Add rethook arm implementation"
bpftool: Fix a bug in subskeleton code generation
bpf: Fix bpf_prog_pack when PMU_SIZE is not defined
bpf: Fix bpf_prog_pack for multi-node setup
bpf: Fix warning for cast from restricted gfp_t in verifier
bpf, arm: Fix various typos in comments
libbpf: Close fd in bpf_object__reuse_map
bpftool: Fix print error when show bpf map
bpf: Fix kprobe_multi return probe backtrace
Revert "bpf: Add support to inline bpf_get_func_ip helper on x86"
bpf: Simplify check in btf_parse_hdr()
selftests/bpf/test_lirc_mode2.sh: Exit with proper code
bpf: Check for NULL return from bpf_get_btf_vmlinux
selftests/bpf: Test skipping stacktrace
bpf: Adjust BPF stack helper functions to accommodate skip > 0
bpf: Select proper size for bpf_prog_pack
...
====================

Link: https://lore.kernel.org/r/20220322050159.5507-1-alexei.starovoitov@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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bpf, test_run: Fix packet size check for live packet mode

The live packet mode uses some extra space at the start of each page to
cache data structures so they don't have to be rebuilt at every repe

bpf, test_run: Fix packet size check for live packet mode

The live packet mode uses some extra space at the start of each page to
cache data structures so they don't have to be rebuilt at every repetition.
This space wasn't correctly accounted for in the size checking of the
arguments supplied to userspace. In addition, the definition of the frame
size should include the size of the skb_shared_info (as there is other
logic that subtracts the size of this).

Together, these mistakes resulted in userspace being able to trip the
XDP_WARN() in xdp_update_frame_from_buff(), which syzbot discovered in
short order. Fix this by changing the frame size define and adding the
extra headroom to the bpf_prog_test_run_xdp() function. Also drop the
max_len parameter to the page_pool init, since this is related to DMA which
is not used for the page pool instance in PROG_TEST_RUN.

Fixes: b530e9e1063e ("bpf: Add "live packet" mode for XDP in BPF_PROG_RUN")
Reported-by: syzbot+0e91362d99386dc5de99@syzkaller.appspotmail.com
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20220310225621.53374-1-toke@redhat.com

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bpf, test_run: Use kvfree() for memory allocated with kvmalloc()

It is allocated with kvmalloc(), the corresponding release function
should not be kfree(), use kvfree() instead.

Generated by: scrip

bpf, test_run: Use kvfree() for memory allocated with kvmalloc()

It is allocated with kvmalloc(), the corresponding release function
should not be kfree(), use kvfree() instead.

Generated by: scripts/coccinelle/api/kfree_mismatch.cocci

Fixes: b530e9e1063e ("bpf: Add "live packet" mode for XDP in BPF_PROG_RUN")
Signed-off-by: Yihao Han <hanyihao@vivo.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Cc: Toke Høiland-Jørgensen <toke@redhat.com>
Link: https://lore.kernel.org/bpf/20220310092828.13405-1-hanyihao@vivo.com

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bpf: Initialise retval in bpf_prog_test_run_xdp()

The kernel test robot pointed out that the newly added
bpf_test_run_xdp_live() runner doesn't set the retval in the caller (by
design), which means

bpf: Initialise retval in bpf_prog_test_run_xdp()

The kernel test robot pointed out that the newly added
bpf_test_run_xdp_live() runner doesn't set the retval in the caller (by
design), which means that the variable can be passed unitialised to
bpf_test_finish(). Fix this by initialising the variable properly.

Fixes: b530e9e1063e ("bpf: Add "live packet" mode for XDP in BPF_PROG_RUN")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20220310110228.161869-1-toke@redhat.com

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Merge branch 'Add support for transmitting packets using XDP in bpf_prog_run()'

Toke Høiland-Jørgensen says:

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

This series adds support for transmitting packets using XDP in
bpf

Merge branch 'Add support for transmitting packets using XDP in bpf_prog_run()'

Toke Høiland-Jørgensen says:

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

This series adds support for transmitting packets using XDP in
bpf_prog_run(), by enabling a new mode "live packet" mode which will handle
the XDP program return codes and redirect the packets to the stack or other
devices.

The primary use case for this is testing the redirect map types and the
ndo_xdp_xmit driver operation without an external traffic generator. But it
turns out to also be useful for creating a programmable traffic generator
in XDP, as well as injecting frames into the stack. A sample traffic
generator, which was included in previous versions of the series, but now
moved to xdp-tools, transmits up to 9 Mpps/core on my test machine.

To transmit the frames, the new mode instantiates a page_pool structure in
bpf_prog_run() and initialises the pages to contain XDP frames with the
data passed in by userspace. These frames can then be handled as though
they came from the hardware XDP path, and the existing page_pool code takes
care of returning and recycling them. The setup is optimised for high
performance with a high number of repetitions to support stress testing and
the traffic generator use case; see patch 1 for details.

v11:
- Fix override of return code in xdp_test_run_batch()
- Add Martin's ACKs to remaining patches

v10:
- Only propagate memory allocation errors from xdp_test_run_batch()
- Get rid of BPF_F_TEST_XDP_RESERVED; batch_size can be used to probe
- Check that batch_size is unset in non-XDP test_run funcs
- Lower the number of repetitions in the selftest to 10k
- Count number of recycled pages in the selftest
- Fix a few other nits from Martin, carry forward ACKs

v9:
- XDP_DROP packets in the selftest to ensure pages are recycled
- Fix a few issues reported by the kernel test robot
- Rewrite the documentation of the batch size to make it a bit clearer
- Rebase to newest bpf-next

v8:
- Make the batch size configurable from userspace
- Don't interrupt the packet loop on errors in do_redirect (this can be
caught from the tracepoint)
- Add documentation of the feature
- Add reserved flag userspace can use to probe for support (kernel didn't
check flags previously)
- Rebase to newest bpf-next, disallow live mode for jumbo frames

v7:
- Extend the local_bh_disable() to cover the full test run loop, to prevent
running concurrently with the softirq. Fixes a deadlock with veth xmit.
- Reinstate the forwarding sysctl setting in the selftest, and bump up the
number of packets being transmitted to trigger the above bug.
- Update commit message to make it clear that user space can select the
ingress interface.

v6:
- Fix meta vs data pointer setting and add a selftest for it
- Add local_bh_disable() around code passing packets up the stack
- Create a new netns for the selftest and use a TC program instead of the
forwarding hack to count packets being XDP_PASS'ed from the test prog.
- Check for the correct ingress ifindex in the selftest
- Rebase and drop patches 1-5 that were already merged

v5:
- Rebase to current bpf-next

v4:
- Fix a few code style issues (Alexei)
- Also handle the other return codes: XDP_PASS builds skbs and injects them
into the stack, and XDP_TX is turned into a redirect out the same
interface (Alexei).
- Drop the last patch adding an xdp_trafficgen program to samples/bpf; this
will live in xdp-tools instead (Alexei).
- Add a separate bpf_test_run_xdp_live() function to test_run.c instead of
entangling the new mode in the existing bpf_test_run().

v3:
- Reorder patches to make sure they all build individually (Patchwork)
- Remove a couple of unused variables (Patchwork)
- Remove unlikely() annotation in slow path and add back John's ACK that I
accidentally dropped for v2 (John)

v2:
- Split up up __xdp_do_redirect to avoid passing two pointers to it (John)
- Always reset context pointers before each test run (John)
- Use get_mac_addr() from xdp_sample_user.h instead of rolling our own (Kumar)
- Fix wrong offset for metadata pointer
====================

Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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bpf: Add "live packet" mode for XDP in BPF_PROG_RUN

This adds support for running XDP programs through BPF_PROG_RUN in a mode
that enables live packet processing of the resulting frames. Previous us

bpf: Add "live packet" mode for XDP in BPF_PROG_RUN

This adds support for running XDP programs through BPF_PROG_RUN in a mode
that enables live packet processing of the resulting frames. Previous uses
of BPF_PROG_RUN for XDP returned the XDP program return code and the
modified packet data to userspace, which is useful for unit testing of XDP
programs.

The existing BPF_PROG_RUN for XDP allows userspace to set the ingress
ifindex and RXQ number as part of the context object being passed to the
kernel. This patch reuses that code, but adds a new mode with different
semantics, which can be selected with the new BPF_F_TEST_XDP_LIVE_FRAMES
flag.

When running BPF_PROG_RUN in this mode, the XDP program return codes will
be honoured: returning XDP_PASS will result in the frame being injected
into the networking stack as if it came from the selected networking
interface, while returning XDP_TX and XDP_REDIRECT will result in the frame
being transmitted out that interface. XDP_TX is translated into an
XDP_REDIRECT operation to the same interface, since the real XDP_TX action
is only possible from within the network drivers themselves, not from the
process context where BPF_PROG_RUN is executed.

Internally, this new mode of operation creates a page pool instance while
setting up the test run, and feeds pages from that into the XDP program.
The setup cost of this is amortised over the number of repetitions
specified by userspace.

To support the performance testing use case, we further optimise the setup
step so that all pages in the pool are pre-initialised with the packet
data, and pre-computed context and xdp_frame objects stored at the start of
each page. This makes it possible to entirely avoid touching the page
content on each XDP program invocation, and enables sending up to 9
Mpps/core on my test box.

Because the data pages are recycled by the page pool, and the test runner
doesn't re-initialise them for each run, subsequent invocations of the XDP
program will see the packet data in the state it was after the last time it
ran on that particular page. This means that an XDP program that modifies
the packet before redirecting it has to be careful about which assumptions
it makes about the packet content, but that is only an issue for the most
naively written programs.

Enabling the new flag is only allowed when not setting ctx_out and data_out
in the test specification, since using it means frames will be redirected
somewhere else, so they can't be returned.

Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20220309105346.100053-2-toke@redhat.com

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Merge branch 'Fixes for bad PTR_TO_BTF_ID offset'

Kumar Kartikeya Dwivedi says:

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

This set fixes a bug related to bad var_off being permitted for kfunc call in
case of PTR_TO_BT

Merge branch 'Fixes for bad PTR_TO_BTF_ID offset'

Kumar Kartikeya Dwivedi says:

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

This set fixes a bug related to bad var_off being permitted for kfunc call in
case of PTR_TO_BTF_ID, consolidates offset checks for all register types allowed
as helper or kfunc arguments into a common shared helper, and introduces a
couple of other checks to harden the kfunc release logic and prevent future
bugs. Some selftests are also included that fail in absence of these fixes,
serving as demonstration of the issues being fixed.

Changelog:
----------
v3 -> v4:
v3: https://lore.kernel.org/bpf/20220304000508.2904128-1-memxor@gmail.com

* Update commit message for __diag patch to say clang instead of LLVM (Nathan)
* Address nits for check_func_arg_reg_off (Martin)
* Add comment for fixed_off_ok case, remove is_kfunc check (Martin)

v2 -> v3:
v2: https://lore.kernel.org/bpf/20220303045029.2645297-1-memxor@gmail.com

* Add my SoB to __diag for clang patch (Nathan)

v1 -> v2:
v1: https://lore.kernel.org/bpf/20220301065745.1634848-1-memxor@gmail.com

* Put reg->off check for release kfunc inside check_func_arg_reg_off,
make the check a bit more readable
* Squash verifier selftests errstr update into patch 3 for bisect (Alexei)
* Include fix from Nathan for clang warning about missing prototypes
* Add unified __diag_ingore_all that works for both GCC/LLVM (Alexei)

Older discussion:
Link: https://lore.kernel.org/bpf/20220219113744.1852259-1-memxor@gmail.com

Kumar Kartikeya Dwivedi (7):
bpf: Add check_func_arg_reg_off function
bpf: Fix PTR_TO_BTF_ID var_off check
bpf: Disallow negative offset in check_ptr_off_reg
bpf: Harden register offset checks for release helpers and kfuncs
compiler_types.h: Add unified __diag_ignore_all for GCC/LLVM
bpf: Replace __diag_ignore with unified __diag_ignore_all
selftests/bpf: Add tests for kfunc register offset checks
====================

Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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selftests/bpf: Add tests for kfunc register offset checks

Include a few verifier selftests that test against the problems being
fixed by previous commits, i.e. release kfunc always require
PTR_TO_BT

selftests/bpf: Add tests for kfunc register offset checks

Include a few verifier selftests that test against the problems being
fixed by previous commits, i.e. release kfunc always require
PTR_TO_BTF_ID fixed and var_off to be 0, and negative offset is not
permitted and returns a helpful error message.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20220304224645.3677453-9-memxor@gmail.com

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bpf: Replace __diag_ignore with unified __diag_ignore_all

Currently, -Wmissing-prototypes warning is ignored for GCC, but not
clang. This leads to clang build warning in W=1 mode. Since the flag
use

bpf: Replace __diag_ignore with unified __diag_ignore_all

Currently, -Wmissing-prototypes warning is ignored for GCC, but not
clang. This leads to clang build warning in W=1 mode. Since the flag
used by both compilers is same, we can use the unified __diag_ignore_all
macro that works for all supported versions and compilers which have
__diag macro support (currently GCC >= 8.0, and Clang >= 11.0).

Also add nf_conntrack_bpf.h include to prevent missing prototype warning
for register_nf_conntrack_bpf.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20220304224645.3677453-8-memxor@gmail.com

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