linux-2.6-microblaze.git
5 years agouaccess: Add non-pagefault user-space write function
Daniel Borkmann [Fri, 1 Nov 2019 23:17:56 +0000 (00:17 +0100)]
uaccess: Add non-pagefault user-space write function

Commit 3d7081822f7f ("uaccess: Add non-pagefault user-space read functions")
missed to add probe write function, therefore factor out a probe_write_common()
helper with most logic of probe_kernel_write() except setting KERNEL_DS, and
add a new probe_user_write() helper so it can be used from BPF side.

Again, on some archs, the user address space and kernel address space can
co-exist and be overlapping, so in such case, setting KERNEL_DS would mean
that the given address is treated as being in kernel address space.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Link: https://lore.kernel.org/bpf/9df2542e68141bfa3addde631441ee45503856a8.1572649915.git.daniel@iogearbox.net
5 years agoMerge branch 'map-pinning'
Alexei Starovoitov [Sat, 2 Nov 2019 19:35:07 +0000 (12:35 -0700)]
Merge branch 'map-pinning'

Toke Høiland-Jørgensen says:

====================
This series adds support to libbpf for reading 'pinning' settings from BTF-based
map definitions. It introduces a new open option which can set the pinning path;
if no path is set, /sys/fs/bpf is used as the default. Callers can customise the
pinning between open and load by setting the pin path per map, and still get the
automatic reuse feature.

The semantics of the pinning is similar to the iproute2 "PIN_GLOBAL" setting,
and the eventual goal is to move the iproute2 implementation to be based on
libbpf and the functions introduced in this series.

Changelog:

v6:
  - Fix leak of struct bpf_object in selftest
  - Make struct bpf_map arg const in bpf_map__is_pinned() and bpf_map__get_pin_path()

v5:
  - Don't pin maps with pinning set, but with a value of LIBBPF_PIN_NONE
  - Add a few more selftests:
    - Should not pin map with pinning set, but value LIBBPF_PIN_NONE
    - Should fail to load a map with an invalid pinning value
    - Should fail to re-use maps with parameter mismatch
  - Alphabetise libbpf.map
  - Whitespace and typo fixes

v4:
  - Don't check key_type_id and value_type_id when checking for map reuse
    compatibility.
  - Move building of map->pin_path into init_user_btf_map()
  - Get rid of 'pinning' attribute in struct bpf_map
  - Make sure we also create parent directory on auto-pin (new patch 3).
  - Abort the selftest on error instead of attempting to continue.
  - Support unpinning all pinned maps with bpf_object__unpin_maps(obj, NULL)
  - Support pinning at map->pin_path with bpf_object__pin_maps(obj, NULL)
  - Make re-pinning a map at the same path a noop
  - Rename the open option to pin_root_path
  - Add a bunch more self-tests for pin_maps(NULL) and unpin_maps(NULL)
  - Fix a couple of smaller nits

v3:
  - Drop bpf_object__pin_maps_opts() and just use an open option to customise
    the pin path; also don't touch bpf_object__{un,}pin_maps()
  - Integrate pinning and reuse into bpf_object__create_maps() instead of having
    multiple loops though the map structure
  - Make errors in map reuse and pinning fatal to the load procedure
  - Add selftest to exercise pinning feature
  - Rebase series to latest bpf-next

v2:
  - Drop patch that adds mounting of bpffs
  - Only support a single value of the pinning attribute
  - Add patch to fixup error handling in reuse_fd()
  - Implement the full automatic pinning and map reuse logic on load
====================

Acked-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
5 years agoselftests: Add tests for automatic map pinning
Toke Høiland-Jørgensen [Sat, 2 Nov 2019 11:09:42 +0000 (12:09 +0100)]
selftests: Add tests for automatic map pinning

This adds a new BPF selftest to exercise the new automatic map pinning
code.

Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/157269298209.394725.15420085139296213182.stgit@toke.dk
5 years agolibbpf: Add auto-pinning of maps when loading BPF objects
Toke Høiland-Jørgensen [Sat, 2 Nov 2019 11:09:41 +0000 (12:09 +0100)]
libbpf: Add auto-pinning of maps when loading BPF objects

This adds support to libbpf for setting map pinning information as part of
the BTF map declaration, to get automatic map pinning (and reuse) on load.
The pinning type currently only supports a single PIN_BY_NAME mode, where
each map will be pinned by its name in a path that can be overridden, but
defaults to /sys/fs/bpf.

Since auto-pinning only does something if any maps actually have a
'pinning' BTF attribute set, we default the new option to enabled, on the
assumption that seamless pinning is what most callers want.

When a map has a pin_path set at load time, libbpf will compare the map
pinned at that location (if any), and if the attributes match, will re-use
that map instead of creating a new one. If no existing map is found, the
newly created map will instead be pinned at the location.

Programs wanting to customise the pinning can override the pinning paths
using bpf_map__set_pin_path() before calling bpf_object__load() (including
setting it to NULL to disable pinning of a particular map).

Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/157269298092.394725.3966306029218559681.stgit@toke.dk
5 years agolibbpf: Move directory creation into _pin() functions
Toke Høiland-Jørgensen [Sat, 2 Nov 2019 11:09:39 +0000 (12:09 +0100)]
libbpf: Move directory creation into _pin() functions

The existing pin_*() functions all try to create the parent directory
before pinning. Move this check into the per-object _pin() functions
instead. This ensures consistent behaviour when auto-pinning is
added (which doesn't go through the top-level pin_maps() function), at the
cost of a few more calls to mkdir().

Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/157269297985.394725.5882630952992598610.stgit@toke.dk
5 years agolibbpf: Store map pin path and status in struct bpf_map
Toke Høiland-Jørgensen [Sat, 2 Nov 2019 11:09:38 +0000 (12:09 +0100)]
libbpf: Store map pin path and status in struct bpf_map

Support storing and setting a pin path in struct bpf_map, which can be used
for automatic pinning. Also store the pin status so we can avoid attempts
to re-pin a map that has already been pinned (or reused from a previous
pinning).

The behaviour of bpf_object__{un,}pin_maps() is changed so that if it is
called with a NULL path argument (which was previously illegal), it will
(un)pin only those maps that have a pin_path set.

Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/157269297876.394725.14782206533681896279.stgit@toke.dk
5 years agolibbpf: Fix error handling in bpf_map__reuse_fd()
Toke Høiland-Jørgensen [Sat, 2 Nov 2019 11:09:37 +0000 (12:09 +0100)]
libbpf: Fix error handling in bpf_map__reuse_fd()

bpf_map__reuse_fd() was calling close() in the error path before returning
an error value based on errno. However, close can change errno, so that can
lead to potentially misleading error messages. Instead, explicitly store
errno in the err variable before each goto.

Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/157269297769.394725.12634985106772698611.stgit@toke.dk
5 years agoMerge branch 'bpf-xskmap-perf-improvements'
Daniel Borkmann [Fri, 1 Nov 2019 23:38:49 +0000 (00:38 +0100)]
Merge branch 'bpf-xskmap-perf-improvements'

Björn Töpel says:

====================
This set consists of three patches from Maciej and myself which are
optimizing the XSKMAP lookups.  In the first patch, the sockets are
moved to be stored at the tail of the struct xsk_map. The second
patch, Maciej implements map_gen_lookup() for XSKMAP. The third patch,
introduced in this revision, moves various XSKMAP functions, to permit
the compiler to do more aggressive inlining.

Based on the XDP program from tools/lib/bpf/xsk.c where
bpf_map_lookup_elem() is explicitly called, this work yields a 5%
improvement for xdpsock's rxdrop scenario. The last patch yields 2%
improvement.

Jonathan's Acked-by: for patch 1 and 2 was carried on. Note that the
overflow checks are done in the bpf_map_area_alloc() and
bpf_map_charge_init() functions, which was fixed in commit
ff1c08e1f74b ("bpf: Change size to u64 for bpf_map_{area_alloc,
charge_init}()").

  [1] https://patchwork.ozlabs.org/patch/1186170/

v1->v2: * Change size/cost to size_t and use {struct, array}_size
          where appropriate. (Jakub)
v2->v3: * Proper commit message for patch 2.
v3->v4: * Change size_t to u64 to handle 32-bit overflows. (Jakub)
        * Introduced patch 3.
v4->v5: * Use BPF_SIZEOF size, instead of BPF_DW, for correct
          pointer-sized loads. (Daniel)
====================

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
5 years agoxsk: Restructure/inline XSKMAP lookup/redirect/flush
Björn Töpel [Fri, 1 Nov 2019 11:03:46 +0000 (12:03 +0100)]
xsk: Restructure/inline XSKMAP lookup/redirect/flush

In this commit the XSKMAP entry lookup function used by the XDP
redirect code is moved from the xskmap.c file to the xdp_sock.h
header, so the lookup can be inlined from, e.g., the
bpf_xdp_redirect_map() function.

Further the __xsk_map_redirect() and __xsk_map_flush() is moved to the
xsk.c, which lets the compiler inline the xsk_rcv() and xsk_flush()
functions.

Finally, all the XDP socket functions were moved from linux/bpf.h to
net/xdp_sock.h, where most of the XDP sockets functions are anyway.

This yields a ~2% performance boost for the xdpsock "rx_drop"
scenario.

Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20191101110346.15004-4-bjorn.topel@gmail.com
5 years agobpf: Implement map_gen_lookup() callback for XSKMAP
Maciej Fijalkowski [Fri, 1 Nov 2019 11:03:45 +0000 (12:03 +0100)]
bpf: Implement map_gen_lookup() callback for XSKMAP

Inline the xsk_map_lookup_elem() via implementing the map_gen_lookup()
callback. This results in emitting the bpf instructions in place of
bpf_map_lookup_elem() helper call and better performance of bpf
programs.

Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Jonathan Lemon <jonathan.lemon@gmail.com>
Link: https://lore.kernel.org/bpf/20191101110346.15004-3-bjorn.topel@gmail.com
5 years agoxsk: Store struct xdp_sock as a flexible array member of the XSKMAP
Björn Töpel [Fri, 1 Nov 2019 11:03:44 +0000 (12:03 +0100)]
xsk: Store struct xdp_sock as a flexible array member of the XSKMAP

Prior this commit, the array storing XDP socket instances were stored
in a separate allocated array of the XSKMAP. Now, we store the sockets
as a flexible array member in a similar fashion as the arraymap. Doing
so, we do less pointer chasing in the lookup.

Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Jonathan Lemon <jonathan.lemon@gmail.com>
Link: https://lore.kernel.org/bpf/20191101110346.15004-2-bjorn.topel@gmail.com
5 years agoRevert "selftests: bpf: Don't try to read files without read permission"
Jakub Kicinski [Fri, 1 Nov 2019 00:51:27 +0000 (17:51 -0700)]
Revert "selftests: bpf: Don't try to read files without read permission"

This reverts commit 5bc60de50dfe ("selftests: bpf: Don't try to read
files without read permission").

Quoted commit does not work at all, and was never tested.
Script requires root permissions (and tests for them)
and os.access() will always return true for root.

The correct fix is needed in the bpf tree, so let's just
revert and save ourselves the merge conflict.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Cc: Jiri Pirko <jiri@resnulli.us>
Link: https://lore.kernel.org/bpf/20191101005127.1355-1-jakub.kicinski@netronome.com
5 years agoMerge branch 'bpf-cleanup-btf-raw-tp'
Daniel Borkmann [Thu, 31 Oct 2019 14:16:59 +0000 (15:16 +0100)]
Merge branch 'bpf-cleanup-btf-raw-tp'

Alexei Starovoitov says:

====================
v1->v2: addressed Andrii's feedback

When BTF-enabled raw_tp were introduced the plan was to follow up
with BTF-enabled kprobe and kretprobe reusing PROG_RAW_TRACEPOINT
and PROG_KPROBE types. But k[ret]probe expect pt_regs while
BTF-enabled program ctx will be the same as raw_tp.
kretprobe is indistinguishable from kprobe while BTF-enabled
kretprobe will have access to retval while kprobe will not.
Hence PROG_KPROBE type is not reusable and reusing
PROG_RAW_TRACEPOINT no longer fits well.
Hence introduce 'umbrella' prog type BPF_PROG_TYPE_TRACING
that will cover different BTF-enabled tracing attach points.
The changes make libbpf side cleaner as well.
check_attach_btf_id() is cleaner too.
====================

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
5 years agolibbpf: Add support for prog_tracing
Alexei Starovoitov [Wed, 30 Oct 2019 22:32:12 +0000 (15:32 -0700)]
libbpf: Add support for prog_tracing

Cleanup libbpf from expected_attach_type == attach_btf_id hack
and introduce BPF_PROG_TYPE_TRACING.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20191030223212.953010-3-ast@kernel.org
5 years agobpf: Replace prog_raw_tp+btf_id with prog_tracing
Alexei Starovoitov [Wed, 30 Oct 2019 22:32:11 +0000 (15:32 -0700)]
bpf: Replace prog_raw_tp+btf_id with prog_tracing

The bpf program type raw_tp together with 'expected_attach_type'
was the most appropriate api to indicate BTF-enabled raw_tp programs.
But during development it became apparent that 'expected_attach_type'
cannot be used and new 'attach_btf_id' field had to be introduced.
Which means that the information is duplicated in two fields where
one of them is ignored.
Clean it up by introducing new program type where both
'expected_attach_type' and 'attach_btf_id' fields have
specific meaning.
In the future 'expected_attach_type' will be extended
with other attach points that have similar semantics to raw_tp.
This patch is replacing BTF-enabled BPF_PROG_TYPE_RAW_TRACEPOINT with
prog_type = BPF_RPOG_TYPE_TRACING
expected_attach_type = BPF_TRACE_RAW_TP
attach_btf_id = btf_id of raw tracepoint inside the kernel
Future patches will add
expected_attach_type = BPF_TRACE_FENTRY or BPF_TRACE_FEXIT
where programs have the same input context and the same helpers,
but different attach points.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20191030223212.953010-2-ast@kernel.org
5 years agobpf: Fix bpf jit kallsym access
Alexei Starovoitov [Wed, 30 Oct 2019 23:30:19 +0000 (16:30 -0700)]
bpf: Fix bpf jit kallsym access

Jiri reported crash when JIT is on, but net.core.bpf_jit_kallsyms is off.
bpf_prog_kallsyms_find() was skipping addr->bpf_prog resolution
logic in oops and stack traces. That's incorrect.
It should only skip addr->name resolution for 'cat /proc/kallsyms'.
That's what bpf_jit_kallsyms and bpf_jit_harden protect.

Fixes: 3dec541b2e63 ("bpf: Add support for BTF pointers to x86 JIT")
Reported-by: Jiri Olsa <jolsa@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20191030233019.1187404-1-ast@kernel.org
5 years agobpf, testing: Introduce 'gso_linear_no_head_frag' skb_segment test
Shmulik Ladkani [Fri, 25 Oct 2019 13:42:23 +0000 (16:42 +0300)]
bpf, testing: Introduce 'gso_linear_no_head_frag' skb_segment test

Following reports of skb_segment() hitting a BUG_ON when working on
GROed skbs which have their gso_size mangled (e.g. after a
bpf_skb_change_proto call), add a reproducer test that mimics the
input skbs that lead to the mentioned BUG_ON as in [1] and validates the
fix submitted in [2].

[1] https://lists.openwall.net/netdev/2019/08/26/110
[2] commit 3dcbdb134f32 ("net: gso: Fix skb_segment splat when splitting gso_size mangled skb having linear-headed frag_list")

Signed-off-by: Shmulik Ladkani <shmulik.ladkani@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20191025134223.2761-3-shmulik.ladkani@gmail.com
5 years agobpf, testing: Refactor test_skb_segment() for testing skb_segment() on different...
Shmulik Ladkani [Fri, 25 Oct 2019 13:42:22 +0000 (16:42 +0300)]
bpf, testing: Refactor test_skb_segment() for testing skb_segment() on different skbs

Currently, test_skb_segment() builds a single test skb and runs
skb_segment() on it.

Extend test_skb_segment() so it processes an array of numerous
skb/feature pairs to test.

Signed-off-by: Shmulik Ladkani <shmulik.ladkani@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20191025134223.2761-2-shmulik.ladkani@gmail.com
5 years agobpf: Add s390 testing documentation
Ilya Leoshkevich [Tue, 29 Oct 2019 17:29:16 +0000 (18:29 +0100)]
bpf: Add s390 testing documentation

This commits adds a document that explains how to test BPF in an s390
QEMU guest.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20191029172916.36528-1-iii@linux.ibm.com
5 years agoselftests/bpf: Test narrow load from bpf_sysctl.write
Ilya Leoshkevich [Tue, 29 Oct 2019 14:30:27 +0000 (15:30 +0100)]
selftests/bpf: Test narrow load from bpf_sysctl.write

There are tests for full and narrows loads from bpf_sysctl.file_pos, but
for bpf_sysctl.write only full load is tested. Add the missing test.

Suggested-by: Andrey Ignatov <rdna@fb.com>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrey Ignatov <rdna@fb.com>
Link: https://lore.kernel.org/bpf/20191029143027.28681-1-iii@linux.ibm.com
5 years agobpf: Enforce 'return 0' in BTF-enabled raw_tp programs
Alexei Starovoitov [Tue, 29 Oct 2019 03:24:26 +0000 (20:24 -0700)]
bpf: Enforce 'return 0' in BTF-enabled raw_tp programs

The return value of raw_tp programs is ignored by __bpf_trace_run()
that calls them. The verifier also allows any value to be returned.
For BTF-enabled raw_tp lets enforce 'return 0', so that return value
can be used for something in the future.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20191029032426.1206762-1-ast@kernel.org
5 years agolibbpf: Don't use kernel-side u32 type in xsk.c
Andrii Nakryiko [Tue, 29 Oct 2019 05:59:53 +0000 (22:59 -0700)]
libbpf: Don't use kernel-side u32 type in xsk.c

u32 is a kernel-side typedef. User-space library is supposed to use __u32.
This breaks Github's projection of libbpf. Do u32 -> __u32 fix.

Fixes: 94ff9ebb49a5 ("libbpf: Fix compatibility for kernels without need_wakeup")
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Björn Töpel <bjorn.topel@intel.com>
Cc: Magnus Karlsson <magnus.karlsson@intel.com>
Link: https://lore.kernel.org/bpf/20191029055953.2461336-1-andriin@fb.com
5 years agolibbpf: Fix off-by-one error in ELF sanity check
Andrii Nakryiko [Mon, 28 Oct 2019 23:37:27 +0000 (16:37 -0700)]
libbpf: Fix off-by-one error in ELF sanity check

libbpf's bpf_object__elf_collect() does simple sanity check after iterating
over all ELF sections, if checks that .strtab index is correct. Unfortunately,
due to section indices being 1-based, the check breaks for cases when .strtab
ends up being the very last section in ELF.

Fixes: 77ba9a5b48a7 ("tools lib bpf: Fetch map names from correct strtab")
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20191028233727.1286699-1-andriin@fb.com
5 years agolibbpf: Fix compatibility for kernels without need_wakeup
Magnus Karlsson [Fri, 25 Oct 2019 09:17:15 +0000 (11:17 +0200)]
libbpf: Fix compatibility for kernels without need_wakeup

When the need_wakeup flag was added to AF_XDP, the format of the
XDP_MMAP_OFFSETS getsockopt was extended. Code was added to the
kernel to take care of compatibility issues arrising from running
applications using any of the two formats. However, libbpf was
not extended to take care of the case when the application/libbpf
uses the new format but the kernel only supports the old
format. This patch adds support in libbpf for parsing the old
format, before the need_wakeup flag was added, and emulating a
set of static need_wakeup flags that will always work for the
application.

v2 -> v3:
* Incorporated code improvements suggested by Jonathan Lemon

v1 -> v2:
* Rebased to bpf-next
* Rewrote the code as the previous version made you blind

Fixes: a4500432c2587cb2a ("libbpf: add support for need_wakeup flag in AF_XDP part")
Reported-by: Eloy Degen <degeneloy@gmail.com>
Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Jonathan Lemon <jonathan.lemon@gmail.com>
Link: https://lore.kernel.org/bpf/1571995035-21889-1-git-send-email-magnus.karlsson@intel.com
5 years agoselftests/bpf: Restore $(OUTPUT)/test_stub.o rule
Ilya Leoshkevich [Mon, 28 Oct 2019 10:21:10 +0000 (11:21 +0100)]
selftests/bpf: Restore $(OUTPUT)/test_stub.o rule

`make O=/linux-build kselftest TARGETS=bpf` fails with

make[3]: *** No rule to make target '/linux-build/bpf/test_stub.o', needed by '/linux-build/bpf/test_verifier'

The same command without the O= part works, presumably thanks to the
implicit rule.

Fix by restoring the explicit $(OUTPUT)/test_stub.o rule.

Fixes: 74b5a5968fe8 ("selftests/bpf: Replace test_progs and test_maps w/ general rule")
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20191028102110.7545-1-iii@linux.ibm.com
5 years agoselftest/bpf: Use -m{little, big}-endian for clang
Ilya Leoshkevich [Mon, 28 Oct 2019 10:20:49 +0000 (11:20 +0100)]
selftest/bpf: Use -m{little, big}-endian for clang

When cross-compiling tests from x86 to s390, the resulting BPF objects
fail to load due to endianness mismatch.

Fix by using BPF-GCC endianness check for clang as well.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20191028102049.7489-1-iii@linux.ibm.com
5 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next
David S. Miller [Sun, 27 Oct 2019 05:57:27 +0000 (22:57 -0700)]
Merge git://git./linux/kernel/git/bpf/bpf-next

Daniel Borkmann says:

====================
pull-request: bpf-next 2019-10-27

The following pull-request contains BPF updates for your *net-next* tree.

We've added 52 non-merge commits during the last 11 day(s) which contain
a total of 65 files changed, 2604 insertions(+), 1100 deletions(-).

The main changes are:

 1) Revolutionize BPF tracing by using in-kernel BTF to type check BPF
    assembly code. The work here teaches BPF verifier to recognize
    kfree_skb()'s first argument as 'struct sk_buff *' in tracepoints
    such that verifier allows direct use of bpf_skb_event_output() helper
    used in tc BPF et al (w/o probing memory access) that dumps skb data
    into perf ring buffer. Also add direct loads to probe memory in order
    to speed up/replace bpf_probe_read() calls, from Alexei Starovoitov.

 2) Big batch of changes to improve libbpf and BPF kselftests. Besides
    others: generalization of libbpf's CO-RE relocation support to now
    also include field existence relocations, revamp the BPF kselftest
    Makefile to add test runner concept allowing to exercise various
    ways to build BPF programs, and teach bpf_object__open() and friends
    to automatically derive BPF program type/expected attach type from
    section names to ease their use, from Andrii Nakryiko.

 3) Fix deadlock in stackmap's build-id lookup on rq_lock(), from Song Liu.

 4) Allow to read BTF as raw data from bpftool. Most notable use case
    is to dump /sys/kernel/btf/vmlinux through this, from Jiri Olsa.

 5) Use bpf_redirect_map() helper in libbpf's AF_XDP helper prog which
    manages to improve "rx_drop" performance by ~4%., from Björn Töpel.

 6) Fix to restore the flow dissector after reattach BPF test and also
    fix error handling in bpf_helper_defs.h generation, from Jakub Sitnicki.

 7) Improve verifier's BTF ctx access for use outside of raw_tp, from
    Martin KaFai Lau.

 8) Improve documentation for AF_XDP with new sections and to reflect
    latest features, from Magnus Karlsson.

 9) Add back 'version' section parsing to libbpf for old kernels, from
    John Fastabend.

10) Fix strncat bounds error in libbpf's libbpf_prog_type_by_name(),
    from KP Singh.

11) Turn on -mattr=+alu32 in LLVM by default for BPF kselftests in order
    to improve insn coverage for built BPF progs, from Yonghong Song.

12) Misc minor cleanups and fixes, from various others.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agotc-testing: list required kernel options for act_ct action
Roman Mashak [Sat, 26 Oct 2019 15:11:09 +0000 (11:11 -0400)]
tc-testing: list required kernel options for act_ct action

Updated config with required kernel options for conntrac TC action,
so that tdc can run the tests.

Signed-off-by: Roman Mashak <mrv@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next
David S. Miller [Sat, 26 Oct 2019 18:35:43 +0000 (11:35 -0700)]
Merge git://git./linux/kernel/git/pablo/nf-next

Pablo Neira Ayuso says:

====================
Netfilter/IPVS updates for net-next

The following patchset contains Netfilter/IPVS updates for net-next,
more specifically:

* Updates for ipset:

1) Coding style fix for ipset comment extension, from Jeremy Sowden.

2) De-inline many functions in ipset, from Jeremy Sowden.

3) Move ipset function definition from header to source file.

4) Move ip_set_put_flags() to source, export it as a symbol, remove
   inline.

5) Move range_to_mask() to the source file where this is used.

6) Move ip_set_get_ip_port() to the source file where this is used.

* IPVS selftests and netns improvements:

7) Two patches to speedup ipvs netns dismantle, from Haishuang Yan.

8) Three patches to add selftest script for ipvs, also from
   Haishuang Yan.

* Conntrack updates and new nf_hook_slow_list() function:

9) Document ct ecache extension, from Florian Westphal.

10) Skip ct extensions from ctnetlink dump, from Florian.

11) Free ct extension immediately, from Florian.

12) Skip access to ecache extension from nf_ct_deliver_cached_events()
    this is not correct as reported by Syzbot.

13) Add and use nf_hook_slow_list(), from Florian.

* Flowtable infrastructure updates:

14) Move priority to nf_flowtable definition.

15) Dynamic allocation of per-device hooks in flowtables.

16) Allow to include netdevice only once in flowtable definitions.

17) Rise maximum number of devices per flowtable.

* Netfilter hardware offload infrastructure updates:

18) Add nft_flow_block_chain() helper function.

19) Pass callback list to nft_setup_cb_call().

20) Add nft_flow_cls_offload_setup() helper function.

21) Remove rules for the unregistered device via netdevice event.

22) Support for multiple devices in a basechain definition at the
    ingress hook.

22) Add nft_chain_offload_cmd() helper function.

23) Add nft_flow_block_offload_init() helper function.

24) Rewind in case of failing to bind multiple devices to hook.

25) Typo in IPv6 tproxy module description, from Norman Rasmussen.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agoMerge branch 'net-aquantia-ptp-followup-fixes'
David S. Miller [Sat, 26 Oct 2019 18:28:40 +0000 (11:28 -0700)]
Merge branch 'net-aquantia-ptp-followup-fixes'

Igor Russkikh says:

====================
net: aquantia: ptp followup fixes

Here are two sparse warnings, third patch is a fix for
scaled_ppm_to_ppb missing. Eventually I reworked this
to exclude ptp module from build. Please consider it instead
of this patch: https://patchwork.ozlabs.org/patch/1184171/
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet: aquantia: disable ptp object build if no config
Igor Russkikh [Sat, 26 Oct 2019 11:05:34 +0000 (11:05 +0000)]
net: aquantia: disable ptp object build if no config

We do disable aq_ptp module build using inline
stubs when CONFIG_PTP_1588_CLOCK is not declared.

This reduces module size and removes unnecessary code.

Reported-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet: aquantia: fix warnings on endianness
Igor Russkikh [Sat, 26 Oct 2019 11:05:33 +0000 (11:05 +0000)]
net: aquantia: fix warnings on endianness

fixes to remove sparse warnings:
sparse: sparse: cast to restricted __be64

Fixes: 04a1839950d9 ("net: aquantia: implement data PTP datapath")
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet: aquantia: fix var initialization warning
Igor Russkikh [Sat, 26 Oct 2019 11:05:31 +0000 (11:05 +0000)]
net: aquantia: fix var initialization warning

found by sparse, simply useless local initialization with zero.

Fixes: 94ad94558b0f ("net: aquantia: add PTP rings infrastructure")
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonetfilter: nf_tables_offload: unbind if multi-device binding fails
Pablo Neira Ayuso [Thu, 24 Oct 2019 08:30:19 +0000 (10:30 +0200)]
netfilter: nf_tables_offload: unbind if multi-device binding fails

nft_flow_block_chain() needs to unbind in case of error when performing
the multi-device binding.

Fixes: d54725cd11a5 ("netfilter: nf_tables: support for multiple devices per netdev hook")
Reported-by: wenxu <wenxu@ucloud.cn>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
5 years agonetfilter: nf_tables_offload: add nft_flow_block_offload_init()
Pablo Neira Ayuso [Thu, 24 Oct 2019 08:00:51 +0000 (10:00 +0200)]
netfilter: nf_tables_offload: add nft_flow_block_offload_init()

This patch adds the nft_flow_block_offload_init() helper function to
initialize the flow_block_offload object.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
5 years agonetfilter: nf_tables_offload: add nft_chain_offload_cmd()
Pablo Neira Ayuso [Thu, 24 Oct 2019 07:47:08 +0000 (09:47 +0200)]
netfilter: nf_tables_offload: add nft_chain_offload_cmd()

This patch adds the nft_chain_offload_cmd() helper function.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
5 years agonetfilter: ecache: don't look for ecache extension on dying/unconfirmed conntracks
Florian Westphal [Tue, 22 Oct 2019 16:56:42 +0000 (18:56 +0200)]
netfilter: ecache: don't look for ecache extension on dying/unconfirmed conntracks

syzbot reported following splat:
BUG: KASAN: use-after-free in __nf_ct_ext_exist
include/net/netfilter/nf_conntrack_extend.h:53 [inline]
BUG: KASAN: use-after-free in nf_ct_deliver_cached_events+0x5c3/0x6d0
net/netfilter/nf_conntrack_ecache.c:205
nf_conntrack_confirm include/net/netfilter/nf_conntrack_core.h:65 [inline]
nf_confirm+0x3d8/0x4d0 net/netfilter/nf_conntrack_proto.c:154
[..]

While there is no reproducer yet, the syzbot report contains one
interesting bit of information:

Freed by task 27585:
[..]
 kfree+0x10a/0x2c0 mm/slab.c:3757
 nf_ct_ext_destroy+0x2ab/0x2e0 net/netfilter/nf_conntrack_extend.c:38
 nf_conntrack_free+0x8f/0xe0 net/netfilter/nf_conntrack_core.c:1418
 destroy_conntrack+0x1a2/0x270 net/netfilter/nf_conntrack_core.c:626
 nf_conntrack_put include/linux/netfilter/nf_conntrack_common.h:31 [inline]
 nf_ct_resolve_clash net/netfilter/nf_conntrack_core.c:915 [inline]
 ^^^^^^^^^^^^^^^^^^^
 __nf_conntrack_confirm+0x21ca/0x2830 net/netfilter/nf_conntrack_core.c:1038
 nf_conntrack_confirm include/net/netfilter/nf_conntrack_core.h:63 [inline]
 nf_confirm+0x3e7/0x4d0 net/netfilter/nf_conntrack_proto.c:154

This is whats happening:

1. a conntrack entry is about to be confirmed (added to hash table).
2. a clash with existing entry is detected.
3. nf_ct_resolve_clash() puts skb->nfct (the "losing" entry).
4. this entry now has a refcount of 0 and is freed to SLAB_TYPESAFE_BY_RCU
   kmem cache.

skb->nfct has been replaced by the one found in the hash.
Problem is that nf_conntrack_confirm() uses the old ct:

static inline int nf_conntrack_confirm(struct sk_buff *skb)
{
 struct nf_conn *ct = (struct nf_conn *)skb_nfct(skb);
 int ret = NF_ACCEPT;

  if (ct) {
    if (!nf_ct_is_confirmed(ct))
       ret = __nf_conntrack_confirm(skb);
    if (likely(ret == NF_ACCEPT))
nf_ct_deliver_cached_events(ct); /* This ct has refcount 0! */
  }
  return ret;
}

As of "netfilter: conntrack: free extension area immediately", we can't
access conntrack extensions in this case.

To fix this, make sure we check the dying bit presence before attempting
to get the eache extension.

Reported-by: syzbot+c7aabc9fe93e7f3637ba@syzkaller.appspotmail.com
Fixes: 2ad9d7747c10d1 ("netfilter: conntrack: free extension area immediately")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
5 years agoMerge branch 'ionic-updates'
David S. Miller [Sat, 26 Oct 2019 03:52:36 +0000 (20:52 -0700)]
Merge branch 'ionic-updates'

Shannon Nelson says:

====================
ionic updates

These are a few of the driver updates we've been working on internally.
These clean up a few mismatched struct comments, add checking for dead
firmware, fix an initialization bug, and change the Rx buffer management.

These are based on net-next v5.4-rc3-709-g985fd98ab5cc.

v2: clear napi->skb in the error case in ionic_rx_frags()
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agoionic: update driver version
Shannon Nelson [Thu, 24 Oct 2019 00:49:00 +0000 (17:49 -0700)]
ionic: update driver version

Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agoionic: implement support for rx sgl
Shannon Nelson [Thu, 24 Oct 2019 00:48:59 +0000 (17:48 -0700)]
ionic: implement support for rx sgl

Even out Rx performance across MTU sizes by changing from full
skb allocations to page-based frag allocations.  The device
supports a form of scatter-gather in the Rx path, so we can
set up a number of pages for each descriptor, all of which are
easier to alloc and pass around than the standard kzalloc'd
buffer.  An skb is wrapped around the pages while processing
the received packets, and pages are recycled as needed, or
left alone if they weren't used in the Rx.

Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agoionic: add a watchdog timer to monitor heartbeat
Shannon Nelson [Thu, 24 Oct 2019 00:48:58 +0000 (17:48 -0700)]
ionic: add a watchdog timer to monitor heartbeat

Add a watchdog to periodically monitor the NIC heartbeat.

Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agoionic: add heartbeat check
Shannon Nelson [Thu, 24 Oct 2019 00:48:57 +0000 (17:48 -0700)]
ionic: add heartbeat check

Most of our firmware has a heartbeat feature that the driver
can watch for to see if the FW is still alive and likely to
answer a dev_cmd or AdminQ request.

Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agoionic: reverse an interrupt coalesce calculation
Shannon Nelson [Thu, 24 Oct 2019 00:48:56 +0000 (17:48 -0700)]
ionic: reverse an interrupt coalesce calculation

Fix the initial interrupt coalesce usec-to-hw setting
to actually be usec-to-hw.

Fixes: 780eded34ccc ("ionic: report users coalesce request")
Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agoionic: fix up struct name comments
Shannon Nelson [Thu, 24 Oct 2019 00:48:55 +0000 (17:48 -0700)]
ionic: fix up struct name comments

Fix up struct names in the ionic_if.h comments

Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agor8169: improve rtl8169_rx_fill
Heiner Kallweit [Wed, 23 Oct 2019 19:36:14 +0000 (21:36 +0200)]
r8169: improve rtl8169_rx_fill

We have only one user of the error path, so we can inline it.
In addition the call to rtl8169_make_unusable_by_asic() can be removed
because rtl8169_alloc_rx_data() didn't call rtl8169_mark_to_asic() yet
for the respective index if returning NULL.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agor8169: align fix_features callback with vendor driver
Heiner Kallweit [Wed, 23 Oct 2019 19:09:34 +0000 (21:09 +0200)]
r8169: align fix_features callback with vendor driver

This patch aligns the fix_features callback with the vendor driver and
also disables IPv6 HW checksumming and TSO if jumbo packets are used
on RTL8101/RTL8168/RTL8125.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agoMerge branch 'for-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetoot...
David S. Miller [Sat, 26 Oct 2019 03:19:44 +0000 (20:19 -0700)]
Merge branch 'for-upstream' of git://git./linux/kernel/git/bluetooth/bluetooth-next

Johan Hedberg says:

====================
pull request: bluetooth-next 2019-10-23

Here's the main bluetooth-next pull request for the 5.5 kernel:

 - Multiple fixes to hci_qca driver
 - Fix for HCI_USER_CHANNEL initialization
 - btwlink: drop superseded driver
 - Add support for Intel FW download error recovery
 - Various other smaller fixes & improvements

Please let me know if there are any issues pulling. Thanks.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agotcp: add TCP_INFO status for failed client TFO
Jason Baron [Wed, 23 Oct 2019 15:09:26 +0000 (11:09 -0400)]
tcp: add TCP_INFO status for failed client TFO

The TCPI_OPT_SYN_DATA bit as part of tcpi_options currently reports whether
or not data-in-SYN was ack'd on both the client and server side. We'd like
to gather more information on the client-side in the failure case in order
to indicate the reason for the failure. This can be useful for not only
debugging TFO, but also for creating TFO socket policies. For example, if
a middle box removes the TFO option or drops a data-in-SYN, we can
can detect this case, and turn off TFO for these connections saving the
extra retransmits.

The newly added tcpi_fastopen_client_fail status is 2 bits and has the
following 4 states:

1) TFO_STATUS_UNSPEC

Catch-all state which includes when TFO is disabled via black hole
detection, which is indicated via LINUX_MIB_TCPFASTOPENBLACKHOLE.

2) TFO_COOKIE_UNAVAILABLE

If TFO_CLIENT_NO_COOKIE mode is off, this state indicates that no cookie
is available in the cache.

3) TFO_DATA_NOT_ACKED

Data was sent with SYN, we received a SYN/ACK but it did not cover the data
portion. Cookie is not accepted by server because the cookie may be invalid
or the server may be overloaded.

4) TFO_SYN_RETRANSMITTED

Data was sent with SYN, we received a SYN/ACK which did not cover the data
after at least 1 additional SYN was sent (without data). It may be the case
that a middle-box is dropping data-in-SYN packets. Thus, it would be more
efficient to not use TFO on this connection to avoid extra retransmits
during connection establishment.

These new fields do not cover all the cases where TFO may fail, but other
failures, such as SYN/ACK + data being dropped, will result in the
connection not becoming established. And a connection blackhole after
session establishment shows up as a stalled connection.

Signed-off-by: Jason Baron <jbaron@akamai.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Neal Cardwell <ncardwell@google.com>
Cc: Christoph Paasch <cpaasch@apple.com>
Cc: Yuchung Cheng <ycheng@google.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agoMerge branch 'phy-dp83867-enable-robust-auto-mdix'
David S. Miller [Sat, 26 Oct 2019 02:24:47 +0000 (19:24 -0700)]
Merge branch 'phy-dp83867-enable-robust-auto-mdix'

Grygorii Strashko says:

====================
net: phy: dp83867: enable robust auto-mdix

Patch 1 - improves link detection when dp83867 PHY is configured in manual mode
by enabling CFG3[9] Robust Auto-MDIX option.

Patch 2 - is minor optimization.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet: phy: dp83867: move dt parsing to probe
Grygorii Strashko [Wed, 23 Oct 2019 14:48:46 +0000 (17:48 +0300)]
net: phy: dp83867: move dt parsing to probe

Move DT parsing code to probe dp83867_probe() as it's one time operation.

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet: phy: dp83867: enable robust auto-mdix
Grygorii Strashko [Wed, 23 Oct 2019 14:48:45 +0000 (17:48 +0300)]
net: phy: dp83867: enable robust auto-mdix

The link detection timeouts can be observed (or link might not be detected
at all) when dp83867 PHY is configured in manual mode (speed/duplex).

CFG3[9] Robust Auto-MDIX option allows to significantly improve link detection
in case dp83867 is configured in manual mode and reduce link detection
time.
As per DM: "If link partners are configured to operational modes that are
not supported by normal Auto MDI/MDIX mode (like Auto-Neg versus Force
100Base-TX or Force 100Base-TX versus Force 100Base-TX), this Robust Auto
MDI/MDIX mode allows MDI/MDIX resolution and prevents deadlock."

Hence, enable this option by default as there are no known reasons
not to do so.

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet: sch_generic: Use pfifo_fast as fallback scheduler for CAN hardware
Vincent Prince [Wed, 23 Oct 2019 13:44:20 +0000 (15:44 +0200)]
net: sch_generic: Use pfifo_fast as fallback scheduler for CAN hardware

There is networking hardware that isn't based on Ethernet for layers 1 and 2.

For example CAN.

CAN is a multi-master serial bus standard for connecting Electronic Control
Units [ECUs] also known as nodes. A frame on the CAN bus carries up to 8 bytes
of payload. Frame corruption is detected by a CRC. However frame loss due to
corruption is possible, but a quite unusual phenomenon.

While fq_codel works great for TCP/IP, it doesn't for CAN. There are a lot of
legacy protocols on top of CAN, which are not build with flow control or high
CAN frame drop rates in mind.

When using fq_codel, as soon as the queue reaches a certain delay based length,
skbs from the head of the queue are silently dropped. Silently meaning that the
user space using a send() or similar syscall doesn't get an error. However
TCP's flow control algorithm will detect dropped packages and adjust the
bandwidth accordingly.

When using fq_codel and sending raw frames over CAN, which is the common use
case, the user space thinks the package has been sent without problems, because
send() returned without an error. pfifo_fast will drop skbs, if the queue
length exceeds the maximum. But with this scheduler the skbs at the tail are
dropped, an error (-ENOBUFS) is propagated to user space. So that the user
space can slow down the package generation.

On distributions, where fq_codel is made default via CONFIG_DEFAULT_NET_SCH
during compile time, or set default during runtime with sysctl
net.core.default_qdisc (see [1]), we get a bad user experience. In my test case
with pfifo_fast, I can transfer thousands of million CAN frames without a frame
drop. On the other hand with fq_codel there is more then one lost CAN frame per
thousand frames.

As pointed out fq_codel is not suited for CAN hardware, so this patch changes
attach_one_default_qdisc() to use pfifo_fast for "ARPHRD_CAN" network devices.

During transition of a netdev from down to up state the default queuing
discipline is attached by attach_default_qdiscs() with the help of
attach_one_default_qdisc(). This patch modifies attach_one_default_qdisc() to
attach the pfifo_fast (pfifo_fast_ops) if the network device type is
"ARPHRD_CAN".

[1] https://github.com/systemd/systemd/issues/9194

Suggested-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Vincent Prince <vincent.prince.fr@gmail.com>
Acked-by: Dave Taht <dave.taht@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agor8152: check the pointer rtl_fw->fw before using it
Hayes Wang [Wed, 23 Oct 2019 13:24:44 +0000 (21:24 +0800)]
r8152: check the pointer rtl_fw->fw before using it

Fix the pointer rtl_fw->fw would be used before checking in
rtl8152_apply_firmware() that causes the following kernel oops.

Unable to handle kernel NULL pointer dereference at virtual address 00000002
pgd = (ptrval)
[00000002] *pgd=00000000
Internal error: Oops: 5 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 0 PID: 131 Comm: kworker/0:2 Not tainted
5.4.0-rc1-00539-g9370f2d05a2a #6788
Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
Workqueue: events_long rtl_hw_phy_work_func_t
PC is at rtl8152_apply_firmware+0x14/0x464
LR is at r8153_hw_phy_cfg+0x24/0x17c
pc : [<c064f4e4>]    lr : [<c064fa18>]    psr: a0000013
sp : e75c9e60  ip : 60000013  fp : c11b7614
r10: e883b91c  r9 : 00000000  r8 : fffffffe
r7 : e883b640  r6 : fffffffe  r5 : fffffffe  r4 : e883b640
r3 : 736cfe7c  r2 : 736cfe7c  r1 : 000052f8  r0 : e883b640
Flags: NzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
Control: 10c5387d  Table: 6640006a  DAC: 00000051
Process kworker/0:2 (pid: 131, stack limit = 0x(ptrval))
Stack: (0xe75c9e60 to 0xe75ca000)
...
[<c064f4e4>] (rtl8152_apply_firmware) from [<c064fa18>]
(r8153_hw_phy_cfg+0x24/0x17c)
[<c064fa18>] (r8153_hw_phy_cfg) from [<c064e784>]
(rtl_hw_phy_work_func_t+0x220/0x3e4)
[<c064e784>] (rtl_hw_phy_work_func_t) from [<c0148a74>]
(process_one_work+0x22c/0x7c8)
[<c0148a74>] (process_one_work) from [<c0149054>] (worker_thread+0x44/0x520)
[<c0149054>] (worker_thread) from [<c0150548>] (kthread+0x130/0x164)
[<c0150548>] (kthread) from [<c01010b4>] (ret_from_fork+0x14/0x20)
Exception stack(0xe75c9fb0 to 0xe75c9ff8)
...

Fixes: 9370f2d05a2a ("r8152: support request_firmware for RTL8153")
Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agoselftests/bpf: Fix .gitignore to ignore no_alu32/
Andrii Nakryiko [Fri, 25 Oct 2019 04:55:03 +0000 (21:55 -0700)]
selftests/bpf: Fix .gitignore to ignore no_alu32/

When switching to alu32 by default, no_alu32/ subdirectory wasn't added
to .gitignore. Fix it.

Fixes: e13a2fe642bd ("tools/bpf: Turn on llvm alu32 attribute by default")
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20191025045503.3043427-1-andriin@fb.com
5 years agobpftool: Allow to read btf as raw data
Jiri Olsa [Thu, 24 Oct 2019 13:30:25 +0000 (15:30 +0200)]
bpftool: Allow to read btf as raw data

The bpftool interface stays the same, but now it's possible
to run it over BTF raw data, like:

  $ bpftool btf dump file /sys/kernel/btf/vmlinux
  [1] INT '(anon)' size=4 bits_offset=0 nr_bits=32 encoding=(none)
  [2] INT 'long unsigned int' size=8 bits_offset=0 nr_bits=64 encoding=(none)
  [3] CONST '(anon)' type_id=2

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Link: https://lore.kernel.org/bpf/20191024133025.10691-1-jolsa@kernel.org
5 years agobpf: Prepare btf_ctx_access for non raw_tp use case
Martin KaFai Lau [Fri, 25 Oct 2019 00:18:11 +0000 (17:18 -0700)]
bpf: Prepare btf_ctx_access for non raw_tp use case

This patch makes a few changes to btf_ctx_access() to prepare
it for non raw_tp use case where the attach_btf_id is not
necessary a BTF_KIND_TYPEDEF.

It moves the "btf_trace_" prefix check and typedef-follow logic to a new
function "check_attach_btf_id()" which is called only once during
bpf_check().  btf_ctx_access() only operates on a BTF_KIND_FUNC_PROTO
type now. That should also be more efficient since it is done only
one instead of every-time check_ctx_access() is called.

"check_attach_btf_id()" needs to find the func_proto type from
the attach_btf_id.  It needs to store the result into the
newly added prog->aux->attach_func_proto.  func_proto
btf type has no name, so a proper name should be stored into
"attach_func_name" also.

v2:
- Move the "btf_trace_" check to an earlier verifier phase (Alexei)

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20191025001811.1718491-1-kafai@fb.com
5 years agoMerge branch 'DPAA-Ethernet-changes'
David S. Miller [Thu, 24 Oct 2019 22:21:58 +0000 (15:21 -0700)]
Merge branch 'DPAA-Ethernet-changes'

Madalin Bucur says:

====================
DPAA Ethernet changes

v3: add newline at the end of error messages
v2: resending with From: field matching signed-off-by

Here's a series of changes for the DPAA Ethernet, addressing minor
or unapparent issues in the codebase, adding probe ordering based on
a recently added DPAA QMan API, removing some redundant code.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agodpaa_eth: add newline in dev_err() msg
Madalin Bucur [Wed, 23 Oct 2019 09:08:46 +0000 (12:08 +0300)]
dpaa_eth: add newline in dev_err() msg

Newline was missing at the end of the error message.

Signed-off-by: Madalin Bucur <madalin.bucur@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agofsl/fman: remove unused struct member
Madalin Bucur [Wed, 23 Oct 2019 09:08:45 +0000 (12:08 +0300)]
fsl/fman: remove unused struct member

Remove unused struct member second_largest_buf_size. Also, an out of
bounds access would have occurred in the removed code if there was only
one buffer pool in use.

Signed-off-by: Madalin Bucur <madalin.bucur@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agodpaa_eth: change DMA device
Madalin Bucur [Wed, 23 Oct 2019 09:08:44 +0000 (12:08 +0300)]
dpaa_eth: change DMA device

The DPAA Ethernet driver is using the FMan MAC as the device for DMA
mapping. This is not actually correct, as the real DMA device is the
FMan port (the FMan Rx port for reception and the FMan Tx port for
transmission). Changing the device used for DMA mapping to the Fman
Rx and Tx port devices.

Signed-off-by: Madalin Bucur <madalin.bucur@nxp.com>
Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agofsl/fman: add API to get the device behind a fman port
Laurentiu Tudor [Wed, 23 Oct 2019 09:08:43 +0000 (12:08 +0300)]
fsl/fman: add API to get the device behind a fman port

Add an API that retrieves the 'struct device' that the specified FMan
port probed against. The new API will be used in a subsequent patch
that corrects the DMA devices used by the dpaa_eth driver.

Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Signed-off-by: Madalin Bucur <madalin.bucur@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agodpaa_eth: remove redundant code
Madalin Bucur [Wed, 23 Oct 2019 09:08:42 +0000 (12:08 +0300)]
dpaa_eth: remove redundant code

Condition was previously checked, removing duplicate code.

Signed-off-by: Madalin Bucur <madalin.bucur@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agodpaa_eth: defer probing after qbman
Laurentiu Tudor [Wed, 23 Oct 2019 09:08:41 +0000 (12:08 +0300)]
dpaa_eth: defer probing after qbman

If the DPAA 1 Ethernet driver gets probed before the QBMan driver it will
cause a boot crash. Add predictability in the probing order by deferring
the Ethernet driver probe after QBMan and portals by using the recently
introduced QBMan APIs.

Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Signed-off-by: Madalin Bucur <madalin.bucur@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agofsl/fman: don't touch liodn base regs reserved on non-PAMU SoCs
Laurentiu Tudor [Wed, 23 Oct 2019 09:08:40 +0000 (12:08 +0300)]
fsl/fman: don't touch liodn base regs reserved on non-PAMU SoCs

The liodn base registers are specific to PAMU based NXP systems and are
reserved on SMMU based ones. Don't access them unless PAMU is compiled in.

Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Signed-off-by: Madalin Bucur <madalin.bucur@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agoMerge branch 'net-aquantia-PTP-support-for-AQC-devices'
David S. Miller [Thu, 24 Oct 2019 16:51:23 +0000 (09:51 -0700)]
Merge branch 'net-aquantia-PTP-support-for-AQC-devices'

Igor Russkikh says:

====================
net: aquantia: PTP support for AQC devices

This patchset introduces PTP feature support in Aquantia AQC atlantic driver.

This implementation is a joined effort of aquantia developers:
Egor is the main designer and driver/firmware architect on PTP,
Sergey and Dmitry are included as co-developers.
Dmitry also helped me in the overall patchset preparations.

Feature was verified on AQC hardware with testptp tool, linuxptp,
gptp and with Motu hardware unit.

version3 updates:
- Review comments applied: error handling, various fixes

version2 updates:
- Fixing issues from Andrew's review: replacing self with
  ptp var name, making ptp_clk_offset a field in the ptp instance.
  devm_kzalloc advice is actually non applicable, because ptp object gets
  created/destroyed on each network device close/open and it should not be
  linked with dev lifecycle.
- Rearranging commit authorship, adding Egor as a ptp module main maintainer
- Fixing kbuild 32bit division issues
====================

Acked-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet: aquantia: adding atlantic ptp maintainer
Igor Russkikh [Tue, 22 Oct 2019 09:53:49 +0000 (09:53 +0000)]
net: aquantia: adding atlantic ptp maintainer

PTP implementation is designed and maintained by Egor Pomozov, adding
him as this module maintainer. Egor is the author of the core
functionality and the architect, and is to be contacted for
all Aquantia PTP/AVB functionality.

Signed-off-by: Egor Pomozov <epomozov@marvell.com>
Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet: aquantia: add support for PIN funcs
Dmitry Bezrukov [Tue, 22 Oct 2019 09:53:47 +0000 (09:53 +0000)]
net: aquantia: add support for PIN funcs

Depending on FW configuration we can manage from 0 to 3 PINs for periodic output
and from 0 to 1 ext ts PIN for getting TS for external event.

Ext TS PIN functionality is implemented via periodic timestamps polling
directly from PHY, because right now there is now way to receive the
PIN trigger interrupt from phy.

The polling interval is 15 milliseconds.

Co-developed-by: Egor Pomozov <epomozov@marvell.com>
Signed-off-by: Egor Pomozov <epomozov@marvell.com>
Co-developed-by: Pavel Belous <pavel.belous@aquantia.com>
Signed-off-by: Pavel Belous <pavel.belous@aquantia.com>
Signed-off-by: Dmitry Bezrukov <dmitry.bezrukov@aquantia.com>
Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet: aquantia: add support for Phy access
Dmitry Bezrukov [Tue, 22 Oct 2019 09:53:45 +0000 (09:53 +0000)]
net: aquantia: add support for Phy access

GPIO PIN control and access is done by direct phy manipulation.
Here we add an aq_phy module which is able to access phy registers
via MDIO access mailbox.

Access is controlled via HW semaphore.

Co-developed-by: Nikita Danilov <nikita.danilov@aquantia.com>
Signed-off-by: Nikita Danilov <nikita.danilov@aquantia.com>
Signed-off-by: Dmitry Bezrukov <dmitry.bezrukov@aquantia.com>
Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet: aquantia: implement get_ts_info ethtool
Egor Pomozov [Tue, 22 Oct 2019 09:53:42 +0000 (09:53 +0000)]
net: aquantia: implement get_ts_info ethtool

Ethtool callback with basic information on what PTP features are supported
by the device.

Signed-off-by: Egor Pomozov <epomozov@marvell.com>
Co-developed-by: Sergey Samoilenko <sergey.samoilenko@aquantia.com>
Signed-off-by: Sergey Samoilenko <sergey.samoilenko@aquantia.com>
Co-developed-by: Dmitry Bezrukov <dmitry.bezrukov@aquantia.com>
Signed-off-by: Dmitry Bezrukov <dmitry.bezrukov@aquantia.com>
Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet: aquantia: add support for ptp ioctls
Egor Pomozov [Tue, 22 Oct 2019 09:53:40 +0000 (09:53 +0000)]
net: aquantia: add support for ptp ioctls

Here we add support for PTP specific IOCTLs of HW timestamp get/set.

These will use filters to configure flows onto the required queue ids.

Co-developed-by: Sergey Samoilenko <sergey.samoilenko@aquantia.com>
Signed-off-by: Sergey Samoilenko <sergey.samoilenko@aquantia.com>
Signed-off-by: Egor Pomozov <epomozov@marvell.com>
Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet: aquantia: rx filters for ptp
Dmitry Bezrukov [Tue, 22 Oct 2019 09:53:38 +0000 (09:53 +0000)]
net: aquantia: rx filters for ptp

We implement HW filter reservation for PTP traffic. Special location
in filters table is marked as reserved, because incoming ptp traffic
should be directed only to PTP designated queue. This way HW will do PTP
timestamping and proper processing.

Co-developed-by: Egor Pomozov <epomozov@marvell.com>
Signed-off-by: Egor Pomozov <epomozov@marvell.com>
Co-developed-by: Sergey Samoilenko <sergey.samoilenko@aquantia.com>
Signed-off-by: Sergey Samoilenko <sergey.samoilenko@aquantia.com>
Signed-off-by: Dmitry Bezrukov <dmitry.bezrukov@aquantia.com>
Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet: aquantia: implement data PTP datapath
Egor Pomozov [Tue, 22 Oct 2019 09:53:35 +0000 (09:53 +0000)]
net: aquantia: implement data PTP datapath

Here we do alloc/free IRQs for PTP rings.
We also implement processing of PTP packets on TX and RX sides.

Signed-off-by: Egor Pomozov <epomozov@marvell.com>
Co-developed-by: Sergey Samoilenko <sergey.samoilenko@aquantia.com>
Signed-off-by: Sergey Samoilenko <sergey.samoilenko@aquantia.com>
Co-developed-by: Dmitry Bezrukov <dmitry.bezrukov@aquantia.com>
Signed-off-by: Dmitry Bezrukov <dmitry.bezrukov@aquantia.com>
Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet: aquantia: styling fixes on ptp related functions
Dmitry Bezrukov [Tue, 22 Oct 2019 09:53:32 +0000 (09:53 +0000)]
net: aquantia: styling fixes on ptp related functions

Checkpatch and styling fixes on parts of code touched by ptp

Signed-off-by: Dmitry Bezrukov <dmitry.bezrukov@aquantia.com>
Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet: aquantia: add PTP rings infrastructure
Egor Pomozov [Tue, 22 Oct 2019 09:53:29 +0000 (09:53 +0000)]
net: aquantia: add PTP rings infrastructure

Add implementations of PTP rings alloc/free.

PTP desing on this device uses two separate rings on a separate traffic
class for traffic rx/tx.

Third ring (hwts) is not a traffic ring, but is used only to receive timestamps
of the transmitted packets.

Signed-off-by: Egor Pomozov <epomozov@marvell.com>
Co-developed-by: Sergey Samoilenko <sergey.samoilenko@aquantia.com>
Signed-off-by: Sergey Samoilenko <sergey.samoilenko@aquantia.com>
Co-developed-by: Dmitry Bezrukov <dmitry.bezrukov@aquantia.com>
Signed-off-by: Dmitry Bezrukov <dmitry.bezrukov@aquantia.com>
Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet: aquantia: add basic ptp_clock callbacks
Egor Pomozov [Tue, 22 Oct 2019 09:53:27 +0000 (09:53 +0000)]
net: aquantia: add basic ptp_clock callbacks

Basic HW functions implemented for adjusting frequency,
adjusting time, getting and setting time.
With these callbacks we now do register ptp clock in the system.

Firmware interface parts are defined for PTP requests and interactions.
Enable/disable PTP counters in HW on clock register/unregister.

Signed-off-by: Egor Pomozov <epomozov@marvell.com>
Co-developed-by: Sergey Samoilenko <sergey.samoilenko@aquantia.com>
Signed-off-by: Sergey Samoilenko <sergey.samoilenko@aquantia.com>
Co-developed-by: Dmitry Bezrukov <dmitry.bezrukov@aquantia.com>
Signed-off-by: Dmitry Bezrukov <dmitry.bezrukov@aquantia.com>
Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet: aquantia: unify styling of bit enums
Dmitry Bezrukov [Tue, 22 Oct 2019 09:53:25 +0000 (09:53 +0000)]
net: aquantia: unify styling of bit enums

Make some other bit-enums more clear about positioning,
this helps on debugging and development

Signed-off-by: Dmitry Bezrukov <dmitry.bezrukov@aquantia.com>
Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet: aquantia: PTP skeleton declarations and callbacks
Egor Pomozov [Tue, 22 Oct 2019 09:53:22 +0000 (09:53 +0000)]
net: aquantia: PTP skeleton declarations and callbacks

Here we add basic function for PTP clock register/unregister.
We also declare FW/HW capability bits used to control PTP feature on device.

PTP device is created if network card has appropriate FW that has PTP
enabled in config. HW supports timestamping for PTPv2 802.AS1 and
PTPv2 IPv4 UDP packets.

It also supports basic PTP callbacks for getting/setting time, adjusting
frequency and time as well.

Signed-off-by: Egor Pomozov <epomozov@marvell.com>
Co-developed-by: Sergey Samoilenko <sergey.samoilenko@aquantia.com>
Signed-off-by: Sergey Samoilenko <sergey.samoilenko@aquantia.com>
Co-developed-by: Dmitry Bezrukov <dmitry.bezrukov@aquantia.com>
Signed-off-by: Dmitry Bezrukov <dmitry.bezrukov@aquantia.com>
Signed-off-by: Igor Russkikh <igor.russkikh@aquantia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet: lan78xx: remove set but not used variable 'event'
YueHaibing [Wed, 23 Oct 2019 07:36:26 +0000 (15:36 +0800)]
net: lan78xx: remove set but not used variable 'event'

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/net/usb/lan78xx.c:3995:6: warning:
 variable event set but not used [-Wunused-but-set-variable]

It is never used, so can be removed.

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agoMerge branch 'mlxsw-Update-main-pool-computation-and-pool-size-limits'
David S. Miller [Thu, 24 Oct 2019 04:31:31 +0000 (21:31 -0700)]
Merge branch 'mlxsw-Update-main-pool-computation-and-pool-size-limits'

Ido Schimmel says:

====================
mlxsw: Update main pool computation and pool size limits

Petr says:

In Spectrum ASICs, the shared buffer is an area of memory where packets are
kept until they can be transmitted. There are two resources associated with
shared buffer size: cap_total_buffer_size and cap_guaranteed_shared_buffer.
So far, mlxsw has been using the former as a limit when validating shared
buffer pool size configuration. However, the total size also includes
headrooms and reserved space, which really cannot be used for shared buffer
pools. Patch #1 mends this and has mlxsw use the guaranteed size.

To configure default pool sizes, mlxsw has historically hard-coded one or
two smallish pools, and one "main" pool that took most of the shared buffer
(that would be pool 0 on ingress and pool 4 on egress). During the
development of Spectrum-2, it became clear that the shared buffer size
keeps shrinking as bugs are identified and worked around. In order to
prevent having to tweak the size of pools 0 and 4 to catch up with updates
to values reported by the FW, patch #2 changes the way these pools are set.
Instead of hard-coding a fixed value, the main pool now takes whatever is
left from the guaranteed size after the smaller pool(s) are taken into
account.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agomlxsw: spectrum_buffers: Calculate the size of the main pool
Petr Machata [Wed, 23 Oct 2019 06:05:00 +0000 (09:05 +0300)]
mlxsw: spectrum_buffers: Calculate the size of the main pool

Instead of hard-coding the size of the largest pool, calculate it from the
reported guaranteed shared buffer size and sizes of other pools (currently
only the CPU port pool).

Signed-off-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agomlxsw: spectrum: Use guaranteed buffer size as pool size limit
Petr Machata [Wed, 23 Oct 2019 06:04:59 +0000 (09:04 +0300)]
mlxsw: spectrum: Use guaranteed buffer size as pool size limit

There are two resources associated with shared buffer size:
cap_total_buffer_size, and cap_guaranteed_shared_buffer. So far, mlxsw has
been using the former as a limit to determine how large a pool size is
allowed to be. However, the total size also includes headrooms and reserved
space, which really cannot be used for shared buffer pools.

Therefore convert mlxsw to use the latter resource as a limit. Adjust
hard-coded pool sizes to be the guaranteed size minus 256000 bytes for CPU
port pool. On Spectrum-1 that actually leads to an increase. A follow-up
patch will have this size calculated automatically.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agor8169: never set PCI_EXP_DEVCTL_NOSNOOP_EN
Heiner Kallweit [Tue, 22 Oct 2019 19:30:57 +0000 (21:30 +0200)]
r8169: never set PCI_EXP_DEVCTL_NOSNOOP_EN

Setting PCI_EXP_DEVCTL_NOSNOOP_EN for certain chip versions had been
added to the vendor driver more than 10 years ago, and copied from
there to r8169. It has been removed from the vendor driver meanwhile
and I think we can safely remove this too.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agoMerge branch 'net-phy-support-1000Base-X-auto-negotiation-for-BCM54616S'
David S. Miller [Thu, 24 Oct 2019 03:42:53 +0000 (20:42 -0700)]
Merge branch 'net-phy-support-1000Base-X-auto-negotiation-for-BCM54616S'

Tao Ren says:

====================
net: phy: support 1000Base-X auto-negotiation for BCM54616S

This patch series aims at supporting auto negotiation when BCM54616S is
running in 1000Base-X mode: without the patch series, BCM54616S PHY driver
would report incorrect link speed in 1000Base-X mode.

Patch #1 (of 3) modifies assignment to OR when dealing with dev_flags in
phy_attach_direct function, so that dev_flags updated in BCM54616S PHY's
probe callback won't be lost.

Patch #2 (of 3) adds several genphy_c37_* functions to support clause 37
1000Base-X auto-negotiation, and these functions are called in BCM54616S
PHY driver.

Patch #3 (of 3) detects BCM54616S PHY's operation mode and calls according
genphy_c37_* functions to configure auto-negotiation and parse link
attributes (speed, duplex, and etc.) in 1000Base-X mode.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet: phy: broadcom: add 1000Base-X support for BCM54616S
Tao Ren [Tue, 22 Oct 2019 18:31:08 +0000 (11:31 -0700)]
net: phy: broadcom: add 1000Base-X support for BCM54616S

The BCM54616S PHY cannot work properly in RGMII->1000Base-X mode, mainly
because genphy functions are designed for copper links, and 1000Base-X
(clause 37) auto negotiation needs to be handled differently.

This patch enables 1000Base-X support for BCM54616S by customizing 3
driver callbacks, and it's verified to be working on Facebook CMM BMC
platform (RGMII->1000Base-KX):

  - probe: probe callback detects PHY's operation mode based on
    INTERF_SEL[1:0] pins and 1000X/100FX selection bit in SerDES 100-FX
    Control register.

  - config_aneg: calls genphy_c37_config_aneg when the PHY is running in
    1000Base-X mode; otherwise, genphy_config_aneg will be called.

  - read_status: calls genphy_c37_read_status when the PHY is running in
    1000Base-X mode; otherwise, genphy_read_status will be called.

Note: BCM54616S PHY can also be configured in RGMII->100Base-FX mode, and
100Base-FX support is not available as of now.

Signed-off-by: Tao Ren <taoren@fb.com>
Acked-by: Vladimir Oltean <olteanv@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet: phy: add support for clause 37 auto-negotiation
Heiner Kallweit [Tue, 22 Oct 2019 18:31:07 +0000 (11:31 -0700)]
net: phy: add support for clause 37 auto-negotiation

This patch adds support for clause 37 1000Base-X auto-negotiation.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Tao Ren <taoren@fb.com>
Tested-by: René van Dorst <opensource@vdorst.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agonet: phy: modify assignment to OR for dev_flags in phy_attach_direct
Tao Ren [Tue, 22 Oct 2019 18:31:06 +0000 (11:31 -0700)]
net: phy: modify assignment to OR for dev_flags in phy_attach_direct

Modify the assignment to OR when dealing with phydev->dev_flags in
phy_attach_direct function, and this is to make sure dev_flags set in
driver's probe callback won't be lost.

Suggested-by: Andrew Lunn <andrew@lunn.ch>
CC: Heiner Kallweit <hkallweit1@gmail.com>
CC: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: Tao Ren <taoren@fb.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
5 years agolibbpf: Fix strncat bounds error in libbpf_prog_type_by_name
KP Singh [Wed, 23 Oct 2019 15:40:38 +0000 (17:40 +0200)]
libbpf: Fix strncat bounds error in libbpf_prog_type_by_name

On compiling samples with this change, one gets an error:

 error: ‘strncat’ specified bound 118 equals destination size
  [-Werror=stringop-truncation]

    strncat(dst, name + section_names[i].len,
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     sizeof(raw_tp_btf_name) - (dst - raw_tp_btf_name));
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

strncat requires the destination to have enough space for the
terminating null byte.

Fixes: f75a697e09137 ("libbpf: Auto-detect btf_id of BTF-based raw_tracepoint")
Signed-off-by: KP Singh <kpsingh@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20191023154038.24075-1-kpsingh@chromium.org
5 years agoxsk: Improve documentation for AF_XDP
Magnus Karlsson [Mon, 21 Oct 2019 08:57:04 +0000 (10:57 +0200)]
xsk: Improve documentation for AF_XDP

Added sections on all the bind flags, libbpf, all the setsockopts and
all the getsockopts. Also updated the document to reflect the latest
features and to correct some spelling errors.

v1 -> v2:
* Updated XDP program with latest BTF map format
* Added one more FAQ entry
* Some minor edits and corrections

v2 -> v3:
* Simplified XDP_SHARED_UMEM example XDP program

Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/1571648224-16889-1-git-send-email-magnus.karlsson@intel.com
5 years agoselftests/bpf: Fix LDLIBS order
Andrii Nakryiko [Wed, 23 Oct 2019 15:31:28 +0000 (08:31 -0700)]
selftests/bpf: Fix LDLIBS order

Order of $(LDLIBS) matters to linker, so put it after all the .o and .a
files.

Fixes: 74b5a5968fe8 ("selftests/bpf: Replace test_progs and test_maps w/ general rule")
Reported-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20191023153128.3486140-1-andriin@fb.com
5 years agoselftests/bpf: Move test_section_names into test_progs and fix it
Andrii Nakryiko [Wed, 23 Oct 2019 06:09:13 +0000 (23:09 -0700)]
selftests/bpf: Move test_section_names into test_progs and fix it

Make test_section_names into test_progs test. Also fix ESRCH expected
results. Add uprobe/uretprobe and tp/raw_tp test cases.

Fixes: dd4436bb8383 ("libbpf: Teach bpf_object__open to guess program types")
Reported-by: kernel test robot <rong.a.chen@intel.com>
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20191023060913.1713817-1-andriin@fb.com
5 years agolibbpf: Use implicit XSKMAP lookup from AF_XDP XDP program
Björn Töpel [Tue, 22 Oct 2019 07:22:06 +0000 (09:22 +0200)]
libbpf: Use implicit XSKMAP lookup from AF_XDP XDP program

In commit 43e74c0267a3 ("bpf_xdp_redirect_map: Perform map lookup in
eBPF helper") the bpf_redirect_map() helper learned to do map lookup,
which means that the explicit lookup in the XDP program for AF_XDP is
not needed for post-5.3 kernels.

This commit adds the implicit map lookup with default action, which
improves the performance for the "rx_drop" [1] scenario with ~4%.

For pre-5.3 kernels, the bpf_redirect_map() returns XDP_ABORTED, and a
fallback path for backward compatibility is entered, where explicit
lookup is still performed. This means a slight regression for older
kernels (an additional bpf_redirect_map() call), but I consider that a
fair punishment for users not upgrading their kernels. ;-)

v1->v2: Backward compatibility (Toke) [2]
v2->v3: Avoid masking/zero-extension by using JMP32 [3]

[1] # xdpsock -i eth0 -z -r
[2] https://lore.kernel.org/bpf/87pnirb3dc.fsf@toke.dk/
[3] https://lore.kernel.org/bpf/87v9sip0i8.fsf@toke.dk/

Suggested-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Toke Høiland-Jørgensen <toke@redhat.com>
Link: https://lore.kernel.org/bpf/20191022072206.6318-1-bjorn.topel@gmail.com
5 years agonetfilter: nf_tables: support for multiple devices per netdev hook
Pablo Neira Ayuso [Wed, 16 Oct 2019 12:30:05 +0000 (14:30 +0200)]
netfilter: nf_tables: support for multiple devices per netdev hook

This patch allows you to register one netdev basechain to multiple
devices. This adds a new NFTA_HOOK_DEVS netlink attribute to specify
the list of netdevices. Basechains store a list of hooks.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
5 years agonetfilter: nf_tables_offload: remove rules on unregistered device only
Pablo Neira Ayuso [Wed, 16 Oct 2019 12:30:02 +0000 (14:30 +0200)]
netfilter: nf_tables_offload: remove rules on unregistered device only

After unbinding the list of flow_block callbacks, iterate over it to
remove the existing rules in the netdevice that has just been
unregistered.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
5 years agonetfilter: nf_tables_offload: add nft_flow_cls_offload_setup()
Pablo Neira Ayuso [Wed, 16 Oct 2019 12:29:59 +0000 (14:29 +0200)]
netfilter: nf_tables_offload: add nft_flow_cls_offload_setup()

Add helper function to set up the flow_cls_offload object.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
5 years agonetfilter: nf_tables_offload: Pass callback list to nft_setup_cb_call()
Pablo Neira Ayuso [Wed, 16 Oct 2019 12:29:56 +0000 (14:29 +0200)]
netfilter: nf_tables_offload: Pass callback list to nft_setup_cb_call()

This allows to reuse nft_setup_cb_call() from the callback unbind path.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
5 years agonetfilter: nf_tables_offload: add nft_flow_block_chain()
Pablo Neira Ayuso [Wed, 16 Oct 2019 12:29:52 +0000 (14:29 +0200)]
netfilter: nf_tables_offload: add nft_flow_block_chain()

Add nft_flow_block_chain() helper function to reuse this function from
netdev event handler.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
5 years agonetfilter: nf_tables: increase maximum devices number per flowtable
Pablo Neira Ayuso [Wed, 16 Oct 2019 12:29:47 +0000 (14:29 +0200)]
netfilter: nf_tables: increase maximum devices number per flowtable

Rise the maximum limit of devices per flowtable up to 256. Rename
NFT_FLOWTABLE_DEVICE_MAX to NFT_NETDEVICE_MAX in preparation to reuse
the netdev hook parser for ingress basechain.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
5 years agonetfilter: nf_tables: allow netdevice to be used only once per flowtable
Pablo Neira Ayuso [Wed, 16 Oct 2019 12:25:05 +0000 (14:25 +0200)]
netfilter: nf_tables: allow netdevice to be used only once per flowtable

Allow netdevice only once per flowtable, otherwise hit EEXIST.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
5 years agonetfilter: nf_tables: dynamically allocate hooks per net_device in flowtables
Pablo Neira Ayuso [Wed, 16 Oct 2019 12:24:01 +0000 (14:24 +0200)]
netfilter: nf_tables: dynamically allocate hooks per net_device in flowtables

Use a list of hooks per device instead an array.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
5 years agonetfilter: nf_flow_table: move priority to struct nf_flowtable
Pablo Neira Ayuso [Wed, 16 Oct 2019 12:23:55 +0000 (14:23 +0200)]
netfilter: nf_flow_table: move priority to struct nf_flowtable

Hardware offload needs access to the priority field, store this field in
the nf_flowtable object.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>