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Syncing if_link.h that got out of sync.
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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bzero() call is deprecated and superseded by memset().
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Reported-by: David Laight <david.laight@aculab.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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On error the skb should be freed. Tested with diff/steps
provided by David Ahern.
v2: surface routing errors to the user instead of a generic EINVAL,
as suggested by David Ahern.
Reported-by: David Ahern <dsahern@gmail.com>
Fixes: 3bd0b15281af ("bpf: add handling of BPF_LWT_REROUTE to lwt_bpf.c")
Signed-off-by: Peter Oskolkov <posk@google.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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This patch adds a bpf self-test to cover BPF_LWT_ENCAP_IP mode
in bpf_lwt_push_encap.
Covered:
- encapping in LWT_IN and LWT_XMIT
- IPv4 and IPv6
A follow-up patch will add GSO and VRF-enabled tests.
Signed-off-by: Peter Oskolkov <posk@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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This patch copies changes in bpf.h done by a previous patch
in this patchset from the kernel uapi include dir into tools
uapi include dir.
Signed-off-by: Peter Oskolkov <posk@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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This patch builds on top of the previous patch in the patchset,
which added BPF_LWT_ENCAP_IP mode to bpf_lwt_push_encap. As the
encapping can result in the skb needing to go via a different
interface/route/dst, bpf programs can indicate this by returning
BPF_LWT_REROUTE, which triggers a new route lookup for the skb.
v8 changes: fix kbuild errors when LWTUNNEL_BPF is builtin, but
IPV6 is a module: as LWTUNNEL_BPF can only be either Y or N,
call IPV6 routing functions only if they are built-in.
v9 changes:
- fixed a kbuild test robot compiler warning;
- call IPV6 routing functions via ipv6_stub.
v10 changes: removed unnecessary IS_ENABLED and pr_warn_once.
v11 changes: fixed a potential dst leak.
Signed-off-by: Peter Oskolkov <posk@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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Proxy ip6_route_input via ipv6_stub, for later use by lwt bpf ip encap
(see the next patch in the patchset).
Signed-off-by: Peter Oskolkov <posk@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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This patch adds handling of GSO packets in bpf_lwt_push_ip_encap()
(called from bpf_lwt_push_encap):
* IPIP, GRE, and UDP encapsulation types are deduced by looking
into iphdr->protocol or ipv6hdr->next_header;
* SCTP GSO packets are not supported (as bpf_skb_proto_4_to_6
and similar do);
* UDP_L4 GSO packets are also not supported (although they are
not blocked in bpf_skb_proto_4_to_6 and similar), as
skb_decrease_gso_size() will break it;
* SKB_GSO_DODGY bit is set.
Note: it may be possible to support SCTP and UDP_L4 gso packets;
but as these cases seem to be not well handled by other
tunneling/encapping code paths, the solution should
be generic enough to apply to all tunneling/encapping code.
v8 changes:
- make sure that if GRE or UDP encap is detected, there is
enough of pushed bytes to cover both IP[v6] + GRE|UDP headers;
- do not reject double-encapped packets;
- whitelist TCP GSO packets rather than block SCTP GSO and
UDP GSO.
Signed-off-by: Peter Oskolkov <posk@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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Implement BPF_LWT_ENCAP_IP mode in bpf_lwt_push_encap BPF helper.
It enables BPF programs (specifically, BPF_PROG_TYPE_LWT_IN and
BPF_PROG_TYPE_LWT_XMIT prog types) to add IP encapsulation headers
to packets (e.g. IP/GRE, GUE, IPIP).
This is useful when thousands of different short-lived flows should be
encapped, each with different and dynamically determined destination.
Although lwtunnels can be used in some of these scenarios, the ability
to dynamically generate encap headers adds more flexibility, e.g.
when routing depends on the state of the host (reflected in global bpf
maps).
v7 changes:
- added a call skb_clear_hash();
- removed calls to skb_set_transport_header();
- refuse to encap GSO-enabled packets.
v8 changes:
- fix build errors when LWT is not enabled.
Note: the next patch in the patchset with deal with GSO-enabled packets,
which are currently rejected at encapping attempt.
Signed-off-by: Peter Oskolkov <posk@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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This patch adds all needed plumbing in preparation to allowing
bpf programs to do IP encapping via bpf_lwt_push_encap. Actual
implementation is added in the next patch in the patchset.
Of note:
- bpf_lwt_push_encap can now be called from BPF_PROG_TYPE_LWT_XMIT
prog types in addition to BPF_PROG_TYPE_LWT_IN;
- if the skb being encapped has GSO set, encapsulation is limited
to IPIP/IP+GRE/IP+GUE (both IPv4 and IPv6);
- as route lookups are different for ingress vs egress, the single
external bpf_lwt_push_encap BPF helper is routed internally to
either bpf_lwt_in_push_encap or bpf_lwt_xmit_push_encap BPF_CALLs,
depending on prog type.
v8 changes: fixed a typo.
Signed-off-by: Peter Oskolkov <posk@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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Currently bpf_offload_dev does not have any priv pointer, forcing
the drivers to work backwards from the netdev in program metadata.
This is not great given programs are conceptually associated with
the offload device, and it means one or two unnecessary deferences.
Add a priv pointer to bpf_offload_dev.
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
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This patch adds missing information about feature-subcommand in
bpftool.rst
Signed-off-by: Prashant Bhole <bhole_prashant_q7@lab.ntt.co.jp>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
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Sub-register mode compilation was enabled only when there are eBPF "v3"
processor supports at both compilation time inside LLVM and runtime inside
kernel.
Given separation betwen build and test server could be often, this patch
removes the runtime support criteria.
Suggested-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Jiong Wang <jiong.wang@netronome.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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At the moment, all kernel bpf objects are listed under BPF_OBJ_FILES.
Listing them manually sometimes causing patch conflict when people are
adding new testcases simultaneously.
It is better to centre all the related source files under a subdir
"progs", then auto-generate the object file list.
Suggested-by: Alexei Starovoitov <ast@kernel.org>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Jiong Wang <jiong.wang@netronome.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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At the moment, we only do extra sub-register mode compilation on bpf object
files used by "test_progs". These object files are really loaded and
executed.
This patch further extends sub-register mode compilation to all bpf object
files, even those without corresponding runtime tests. Because this could
help testing LLVM sub-register code-gen, kernel bpf selftest has much more
C testcases with reasonable size and complexity compared with LLVM
testsuite which only contains unit tests.
There were some file duplication inside BPF_OBJ_FILES_DUAL_COMPILE which
is removed now.
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Jiong Wang <jiong.wang@netronome.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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"alu32" is a build dir and contains various files for BPF sub-register
code-gen testing.
This patch tells git to ignore it.
Suggested-by: Yonghong Song <yhs@fb.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Jiong Wang <jiong.wang@netronome.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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This patch adds a C program to show the usage on
skb->sk and bpf_tcp_sock.
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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This patch tests accessing the skb->sk and the new helpers,
bpf_sk_fullsock and bpf_tcp_sock.
The errstr of some existing "reference tracking" tests is changed
with s/bpf_sock/sock/ and s/socket/sock/ where "sock" is from the
verifier's reg_type_str[].
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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This patch sync the uapi bpf.h to tools/.
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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This patch adds a helper function BPF_FUNC_tcp_sock and it
is currently available for cg_skb and sched_(cls|act):
struct bpf_tcp_sock *bpf_tcp_sock(struct bpf_sock *sk);
int cg_skb_foo(struct __sk_buff *skb) {
struct bpf_tcp_sock *tp;
struct bpf_sock *sk;
__u32 snd_cwnd;
sk = skb->sk;
if (!sk)
return 1;
tp = bpf_tcp_sock(sk);
if (!tp)
return 1;
snd_cwnd = tp->snd_cwnd;
/* ... */
return 1;
}
A 'struct bpf_tcp_sock' is also added to the uapi bpf.h to provide
read-only access. bpf_tcp_sock has all the existing tcp_sock's fields
that has already been exposed by the bpf_sock_ops.
i.e. no new tcp_sock's fields are exposed in bpf.h.
This helper returns a pointer to the tcp_sock. If it is not a tcp_sock
or it cannot be traced back to a tcp_sock by sk_to_full_sk(), it
returns NULL. Hence, the caller needs to check for NULL before
accessing it.
The current use case is to expose members from tcp_sock
to allow a cg_skb_bpf_prog to provide per cgroup traffic
policing/shaping.
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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The next patch will introduce a new "struct bpf_tcp_sock" which
exposes the same tcp_sock's fields already exposed in
"struct bpf_sock_ops".
This patch refactor the existing convert_ctx_access() codes for
"struct bpf_sock_ops" to get them ready to be reused for
"struct bpf_tcp_sock". The "rtt_min" is not refactored
in this patch because its handling is different from other
fields.
The SOCK_OPS_GET_TCP_SOCK_FIELD is new. All other SOCK_OPS_XXX_FIELD
changes are code move only.
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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This patch adds "state", "dst_ip4", "dst_ip6" and "dst_port" to the
bpf_sock. The userspace has already been using "state",
e.g. inet_diag (ss -t) and getsockopt(TCP_INFO).
This patch also allows narrow load on the following existing fields:
"family", "type", "protocol" and "src_port". Unlike IP address,
the load offset is resticted to the first byte for them but it
can be relaxed later if there is a use case.
This patch also folds __sock_filter_check_size() into
bpf_sock_is_valid_access() since it is not called
by any where else. All bpf_sock checking is in
one place.
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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In kernel, it is common to check "skb->sk && sk_fullsock(skb->sk)"
before accessing the fields in sock. For example, in __netdev_pick_tx:
static u16 __netdev_pick_tx(struct net_device *dev, struct sk_buff *skb,
struct net_device *sb_dev)
{
/* ... */
struct sock *sk = skb->sk;
if (queue_index != new_index && sk &&
sk_fullsock(sk) &&
rcu_access_pointer(sk->sk_dst_cache))
sk_tx_queue_set(sk, new_index);
/* ... */
return queue_index;
}
This patch adds a "struct bpf_sock *sk" pointer to the "struct __sk_buff"
where a few of the convert_ctx_access() in filter.c has already been
accessing the skb->sk sock_common's fields,
e.g. sock_ops_convert_ctx_access().
"__sk_buff->sk" is a PTR_TO_SOCK_COMMON_OR_NULL in the verifier.
Some of the fileds in "bpf_sock" will not be directly
accessible through the "__sk_buff->sk" pointer. It is limited
by the new "bpf_sock_common_is_valid_access()".
e.g. The existing "type", "protocol", "mark" and "priority" in bpf_sock
are not allowed.
The newly added "struct bpf_sock *bpf_sk_fullsock(struct bpf_sock *sk)"
can be used to get a sk with all accessible fields in "bpf_sock".
This helper is added to both cg_skb and sched_(cls|act).
int cg_skb_foo(struct __sk_buff *skb) {
struct bpf_sock *sk;
sk = skb->sk;
if (!sk)
return 1;
sk = bpf_sk_fullsock(sk);
if (!sk)
return 1;
if (sk->family != AF_INET6 || sk->protocol != IPPROTO_TCP)
return 1;
/* some_traffic_shaping(); */
return 1;
}
(1) The sk is read only
(2) There is no new "struct bpf_sock_common" introduced.
(3) Future kernel sock's members could be added to bpf_sock only
instead of repeatedly adding at multiple places like currently
in bpf_sock_ops_md, bpf_sock_addr_md, sk_reuseport_md...etc.
(4) After "sk = skb->sk", the reg holding sk is in type
PTR_TO_SOCK_COMMON_OR_NULL.
(5) After bpf_sk_fullsock(), the return type will be in type
PTR_TO_SOCKET_OR_NULL which is the same as the return type of
bpf_sk_lookup_xxx().
However, bpf_sk_fullsock() does not take refcnt. The
acquire_reference_state() is only depending on the return type now.
To avoid it, a new is_acquire_function() is checked before calling
acquire_reference_state().
(6) The WARN_ON in "release_reference_state()" is no longer an
internal verifier bug.
When reg->id is not found in state->refs[], it means the
bpf_prog does something wrong like
"bpf_sk_release(bpf_sk_fullsock(skb->sk))" where reference has
never been acquired by calling "bpf_sk_fullsock(skb->sk)".
A -EINVAL and a verbose are done instead of WARN_ON. A test is
added to the test_verifier in a later patch.
Since the WARN_ON in "release_reference_state()" is no longer
needed, "__release_reference_state()" is folded into
"release_reference_state()" also.
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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By adding this test to test_verifier:
{
"reference tracking: access sk->src_ip4 (narrow load)",
.insns = {
BPF_SK_LOOKUP,
BPF_MOV64_REG(BPF_REG_6, BPF_REG_0),
BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 3),
BPF_LDX_MEM(BPF_H, BPF_REG_2, BPF_REG_0, offsetof(struct bpf_sock, src_ip4) + 2),
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
BPF_EMIT_CALL(BPF_FUNC_sk_release),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.result = ACCEPT,
},
The above test loads 2 bytes from sk->src_ip4 where
sk is obtained by bpf_sk_lookup_tcp().
It hits an internal verifier error from convert_ctx_accesses():
[root@arch-fb-vm1 bpf]# ./test_verifier 665 665
Failed to load prog 'Invalid argument'!
0: (b7) r2 = 0
1: (63) *(u32 *)(r10 -8) = r2
2: (7b) *(u64 *)(r10 -16) = r2
3: (7b) *(u64 *)(r10 -24) = r2
4: (7b) *(u64 *)(r10 -32) = r2
5: (7b) *(u64 *)(r10 -40) = r2
6: (7b) *(u64 *)(r10 -48) = r2
7: (bf) r2 = r10
8: (07) r2 += -48
9: (b7) r3 = 36
10: (b7) r4 = 0
11: (b7) r5 = 0
12: (85) call bpf_sk_lookup_tcp#84
13: (bf) r6 = r0
14: (15) if r0 == 0x0 goto pc+3
R0=sock(id=1,off=0,imm=0) R6=sock(id=1,off=0,imm=0) R10=fp0,call_-1 fp-8=????0000 fp-16=0000mmmm fp-24=mmmmmmmm fp-32=mmmmmmmm fp-40=mmmmmmmm fp-48=mmmmmmmm refs=1
15: (69) r2 = *(u16 *)(r0 +26)
16: (bf) r1 = r6
17: (85) call bpf_sk_release#86
18: (95) exit
from 14 to 18: safe
processed 20 insns (limit 131072), stack depth 48
bpf verifier is misconfigured
Summary: 0 PASSED, 0 SKIPPED, 1 FAILED
The bpf_sock_is_valid_access() is expecting src_ip4 can be narrowly
loaded (meaning load any 1 or 2 bytes of the src_ip4) by
marking info->ctx_field_size. However, this marked
ctx_field_size is not used. This patch fixes it.
Due to the recent refactoring in test_verifier,
this new test will be added to the bpf-next branch
(together with the bpf_tcp_sock patchset)
to avoid merge conflict.
Fixes: c64b7983288e ("bpf: Add PTR_TO_SOCKET verifier type")
Cc: Joe Stringer <joe@wand.net.nz>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Joe Stringer <joe@wand.net.nz>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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Now that we have btf__get_raw_data() it's trivial for tests to iterate
over all strings for testing purposes, which eliminates the need for
btf__get_strings() API.
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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This patch changes struct btf_ext to retain original data in sequential
block of memory, which makes it possible to expose
btf_ext__get_raw_data() interface similar to btf__get_raw_data(), allowing
users of libbpf to get access to raw representation of .BTF.ext section.
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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This patch exposes new API btf__get_raw_data() that allows to get a copy
of raw BTF data out of struct btf. This is useful for external programs
that need to manipulate raw data, e.g., pahole using btf__dedup() to
deduplicate BTF type info and then writing it back to file.
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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This change splits out previous btf__new functionality of constructing
struct btf and loading it into kernel into two:
- btf__new() just creates and initializes struct btf
- btf__load() attempts to load existing struct btf into kernel
btf__free will still close BTF fd, if it was ever loaded successfully
into kernel.
This change allows users of libbpf to manipulate BTF using its API,
without the need to unnecessarily load it into kernel.
One of the intended use cases is pahole, which will do DWARF to BTF
conversion and then use libbpf to do type deduplication, while then
handling ELF sections overwriting and other concerns on its own.
Fixes: 2d3feca8c44f ("bpf: btf: print map dump and lookup with btf info")
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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The kernel verifier has three levels of logs:
0: no logs
1: logs mostly useful
> 1: verbose
Current libbpf API functions bpf_load_program_xattr() and
bpf_load_program() cannot specify log_level.
The bcc, however, provides an interface for user to
specify log_level 2 for verbose output.
This patch added log_level into structure
bpf_load_program_attr, so users, including bcc, can use
bpf_load_program_xattr() to change log_level. The
supported log_level is 0, 1, and 2.
The bpf selftest test_sock.c is modified to enable log_level = 2.
If the "verbose" in test_sock.c is changed to true,
the test will output logs like below:
$ ./test_sock
func#0 @0
0: R1=ctx(id=0,off=0,imm=0) R10=fp0,call_-1
0: (bf) r6 = r1
1: R1=ctx(id=0,off=0,imm=0) R6_w=ctx(id=0,off=0,imm=0) R10=fp0,call_-1
1: (61) r7 = *(u32 *)(r6 +28)
invalid bpf_context access off=28 size=4
Test case: bind4 load with invalid access: src_ip6 .. [PASS]
...
Test case: bind6 allow all .. [PASS]
Summary: 16 PASSED, 0 FAILED
Some test_sock tests are negative tests and verbose verifier
log will be printed out as shown in the above.
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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Few files in libbpf are using bzero() function (defined in strings.h header), but
don't include corresponding header. When libbpf is added as a dependency to pahole,
this undeterministically causes warnings on some machines:
bpf.c:225:2: warning: implicit declaration of function 'bzero' [-Wimplicit-function-declaration]
bzero(&attr, sizeof(attr));
^~~~~
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Reported-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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Add fixed_phy_register_with_gpiod() API. It lets users create a
fixed_phy instance that uses a GPIO descriptor which was obtained
externally e.g. through platform data.
This enables platform devices (non-DT based) to use GPIOs for link
status.
Signed-off-by: Moritz Fischer <mdf@kernel.org>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Add the comphy settings for the Ethernet interfaces.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Add support for the common phy binding, so that we can reconfigure the
comphy according to the desired ethernet speed. This will allow us to
support 1000base-X and 2500base-X SFPs dynamically on SolidRun Clearfog.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Add an optional phys property to the mvneta binding documentation for
the common phy.
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Add the DT description for the Armada 38x common phy.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Add support for the Armada 38x common phy to allow us to change the
speed of the Ethernet serdes lane. This driver only supports
manipulation of the speed, it does not support configuration of the
common phy.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Andrii Nakryiko
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