20 Mar, 2018
8 commits
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This adds the test script I am currently using to validate
the latest sockmap changes. Shortly sockmap will be ported
to selftests and these will be run from the infrastructure
there. Until then add the script here so we have a coverage
checklist when porting into selftests.Signed-off-by: John Fastabend
Acked-by: David S. Miller
Signed-off-by: Daniel Borkmann -
This adds an option to test the msg_pull_data helper. This
uses two options txmsg_start and txmsg_end to let the user
specify start and end bytes to pull.The options can be used with txmsg_apply, txmsg_cork options
as well as with any of the basic tests, txmsg, txmsg_redir and
txmsg_drop (plus noisy variants) to run pull_data inline with
those tests. By giving user direct control over the variables
we can easily do negative testing as well as positive tests.Signed-off-by: John Fastabend
Acked-by: David S. Miller
Signed-off-by: Daniel Borkmann -
Add tests for SK_DROP.
Signed-off-by: John Fastabend
Acked-by: David S. Miller
Signed-off-by: Daniel Borkmann -
Add sample application support for the bpf_msg_cork_bytes helper. This
lets the user specify how many bytes each verdict should apply to.Similar to apply_bytes() tests these can be run as a stand-alone test
when used without other options or inline with other tests by using
the txmsg_cork option along with any of the basic tests txmsg,
txmsg_redir, txmsg_drop.Signed-off-by: John Fastabend
Acked-by: David S. Miller
Signed-off-by: Daniel Borkmann -
This adds an option to test the apply_bytes helper. This option lets
the user specify an int on the command line specifying how much data
each verdict should apply to.When this is set a map entry is set with the bytes input by the user
and then the specified program --txmsg or --txmsg_redir will use the
value and set the applied data. If no other option is set then a
default --txmsg_apply program is run. This program will drop pkts
if an error is detected on the bytes map lookup. Useful to verify
the map lookup and apply helper are working and causing a hard
error if it is not.Signed-off-by: John Fastabend
Acked-by: David S. Miller
Signed-off-by: Daniel Borkmann -
To verify data is not being dropped or corrupted this adds an option
to verify test-patterns on recv.Signed-off-by: John Fastabend
Acked-by: David S. Miller
Signed-off-by: Daniel Borkmann -
To exercise TX ULP sendpage implementation we need a test that does
a sendfile. Add sendfile test option here.Signed-off-by: John Fastabend
Acked-by: David S. Miller
Signed-off-by: Daniel Borkmann -
Add sockmap option to use SK_MSG program types.
Signed-off-by: John Fastabend
Acked-by: David S. Miller
Signed-off-by: Daniel Borkmann
08 Mar, 2018
1 commit
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This commit adds additional test in the trace_event example, by
attaching the bpf program to MEM_UOPS_RETIRED.LOCK_LOADS event with
PERF_SAMPLE_ADDR requested, and print the lock address value read from
the bpf program to trace_pipe.Signed-off-by: Teng Qin
Signed-off-by: Daniel Borkmann
06 Mar, 2018
1 commit
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All of the conflicts were cases of overlapping changes.
In net/core/devlink.c, we have to make care that the
resouce size_params have become a struct member rather
than a pointer to such an object.Signed-off-by: David S. Miller
05 Mar, 2018
1 commit
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The patch adds tests for GRE sequence number
support for metadata mode tunnel.Signed-off-by: William Tu
Acked-by: Daniel Borkmann
Signed-off-by: David S. Miller
02 Mar, 2018
1 commit
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test_cgrp2_sock.sh and test_cgrp2_sock2.sh tests keep the program
attached to cgroup even after completion.
Using detach functionality of test_cgrp2_sock in both scripts.Signed-off-by: Prashant Bhole
Acked-by: David Ahern
Signed-off-by: Daniel Borkmann
28 Feb, 2018
1 commit
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…/kees/linux into fixes-v4.16-rc4
- do not build samples when cross compiling (Michal Hocko)
From Kees: "This disables the seccomp samples when cross compiling. We're seen too many build issues here, so
it's best to just disable it, especially since they're just the samples."
26 Feb, 2018
1 commit
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CPU is active when have running tasks on it and CPUFreq governor can
select different operating points (OPP) according to different workload;
we use 'pstate' to present CPU state which have running tasks with one
specific OPP. On the other hand, CPU is idle which only idle task on
it, CPUIdle governor can select one specific idle state to power off
hardware logics; we use 'cstate' to present CPU idle state.Based on trace events 'cpu_idle' and 'cpu_frequency' we can accomplish
the duration statistics for every state. Every time when CPU enters
into or exits from idle states, the trace event 'cpu_idle' is recorded;
trace event 'cpu_frequency' records the event for CPU OPP changing, so
it's easily to know how long time the CPU stays in the specified OPP,
and the CPU must be not in any idle state.This patch is to utilize the mentioned trace events for pstate and
cstate statistics. To achieve more accurate profiling data, the program
uses below sequence to insure CPU running/idle time aren't missed:- Before profiling the user space program wakes up all CPUs for once, so
can avoid to missing account time for CPU staying in idle state for
long time; the program forces to set 'scaling_max_freq' to lowest
frequency and then restore 'scaling_max_freq' to highest frequency,
this can ensure the frequency to be set to lowest frequency and later
after start to run workload the frequency can be easily to be changed
to higher frequency;- User space program reads map data and update statistics for every 5s,
so this is same with other sample bpf programs for avoiding big
overload introduced by bpf program self;- When send signal to terminate program, the signal handler wakes up
all CPUs, set lowest frequency and restore highest frequency to
'scaling_max_freq'; this is exactly same with the first step so
avoid to missing account CPU pstate and cstate time during last
stage. Finally it reports the latest statistics.The program has been tested on Hikey board with octa CA53 CPUs, below
is one example for statistics result, the format mainly follows up
Jesper Dangaard Brouer suggestion.Jesper reminds to 'get printf to pretty print with thousands separators
use %' and setlocale(LC_NUMERIC, "en_US")', tried three different arm64
GCC toolchains (5.4.0 20160609, 6.2.1 20161016, 6.3.0 20170516) but all
of them cannot support printf flag character %' on arm64 platform, so go
back print number without grouping mode.CPU states statistics:
state(ms) cstate-0 cstate-1 cstate-2 pstate-0 pstate-1 pstate-2 pstate-3 pstate-4
CPU-0 767 6111 111863 561 31 756 853 190
CPU-1 241 10606 107956 484 125 646 990 85
CPU-2 413 19721 98735 636 84 696 757 89
CPU-3 84 11711 79989 17516 909 4811 5773 341
CPU-4 152 19610 98229 444 53 649 708 1283
CPU-5 185 8781 108697 666 91 671 677 1365
CPU-6 157 21964 95825 581 67 566 684 1284
CPU-7 125 15238 102704 398 20 665 786 1197Cc: Daniel Lezcano
Cc: Vincent Guittot
Signed-off-by: Leo Yan
Signed-off-by: Daniel Borkmann
23 Feb, 2018
1 commit
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samples/seccomp relies on the host setting which is not suitable for
crosscompilation and it actually fails when crosscompiling s390 and
powerpc all{yes,mod}config on x86_64 withsamples/seccomp/bpf-helper.h:135:2: error: #error __BITS_PER_LONG value unusable.
#error __BITS_PER_LONG value unusable.
^
In file included from samples/seccomp/bpf-fancy.c:13:0:
samples/seccomp/bpf-fancy.c: In function ‘main’:
samples/seccomp/bpf-fancy.c:38:11: error: ‘__NR_exit’ undeclared (first use in this function)
SYSCALL(__NR_exit, ALLOW),and many others. I am doing these for compile testing and it's been
quite useful to catch issues. Crosscompiling sample code on the other
hand doesn't seem all that important so it seems like the easiest way to
simply disable samples/seccomp when crosscompiling.Fixing this properly is not that easy as Kees explains:
: IIRC, one of the problems is with build ordering problems: the kernel
: headers used by the samples aren't available when cross compiling.Signed-off-by: Michal Hocko
Signed-off-by: Kees Cook
14 Feb, 2018
3 commits
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samples/sockops program keeps the sock_ops program attached to cgroup.
Fixed this by detaching program before exit.Signed-off-by: Prashant Bhole
Signed-off-by: Alexei Starovoitov -
While building samples/sockmap, undefined reference error is thrown
for `nla_dump_errormsg'.
Linking tools/lib/bpf/nlattr.o as a fixSigned-off-by: Prashant Bhole
Signed-off-by: Alexei Starovoitov -
Default rlimit RLIMIT_MEMLOCK is 64KB, causes bpf map failure.
e.g.
[root@labbpf]# ./xdp_redirect $( $(
Signed-off-by: Alexei Starovoitov
07 Feb, 2018
1 commit
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The commit c69de58ba84f ("net: erspan: use bitfield instead of
mask and offset") changes the erspan header to use bitfield, and
commit d350a823020e ("net: erspan: create erspan metadata uapi header")
creates a uapi header file. The above two commit breaks the current
erspan test. This patch fixes it by adapting the above two changes.Fixes: ac80c2a165af ("samples/bpf: add erspan v2 sample code")
Fixes: ef88f89c830f ("samples/bpf: extend test_tunnel_bpf.sh with ERSPAN")
Signed-off-by: William Tu
Signed-off-by: David S. Miller
05 Feb, 2018
1 commit
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Alexei Starovoitov says:
====================
pull-request: bpf 2018-02-02The following pull-request contains BPF updates for your *net* tree.
The main changes are:
1) support XDP attach in libbpf, from Eric.
2) minor fixes, from Daniel, Jakub, Yonghong, Alexei.
====================Signed-off-by: David S. Miller
03 Feb, 2018
2 commits
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Use bpf_set_link_xdp_fd instead of set_link_xdp_fd to remove some
code duplication and benefit of netlink ext ack errors message.Signed-off-by: Eric Leblond
Signed-off-by: Alexei Starovoitov -
Parse netlink ext attribute to get the error message returned by
the card. Code is partially take from libnl.We add netlink.h to the uapi include of tools. And we need to
avoid include of userspace netlink header to have a successful
build of sample so nlattr.h has a define to avoid
the inclusion. Using a direct define could have been an issue
as NLMSGERR_ATTR_MAX can change in the future.We also define SOL_NETLINK if not defined to avoid to have to
copy socket.h for a fixed value.Signed-off-by: Eric Leblond
Acked-by: Alexei Starovoitov
Signed-off-by: Alexei Starovoitov
02 Feb, 2018
1 commit
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Pull driver core updates from Greg KH:
"Here is the set of "big" driver core patches for 4.16-rc1.The majority of the work here is in the firmware subsystem, with
reworks to try to attempt to make the code easier to handle in the
long run, but no functional change. There's also some tree-wide sysfs
attribute fixups with lots of acks from the various subsystem
maintainers, as well as a handful of other normal fixes and changes.And finally, some license cleanups for the driver core and sysfs code.
All have been in linux-next for a while with no reported issues"
* tag 'driver-core-4.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (48 commits)
device property: Define type of PROPERTY_ENRTY_*() macros
device property: Reuse property_entry_free_data()
device property: Move property_entry_free_data() upper
firmware: Fix up docs referring to FIRMWARE_IN_KERNEL
firmware: Drop FIRMWARE_IN_KERNEL Kconfig option
USB: serial: keyspan: Drop firmware Kconfig options
sysfs: remove DEBUG defines
sysfs: use SPDX identifiers
drivers: base: add coredump driver ops
sysfs: add attribute specification for /sysfs/devices/.../coredump
test_firmware: fix missing unlock on error in config_num_requests_store()
test_firmware: make local symbol test_fw_config static
sysfs: turn WARN() into pr_warn()
firmware: Fix a typo in fallback-mechanisms.rst
treewide: Use DEVICE_ATTR_WO
treewide: Use DEVICE_ATTR_RO
treewide: Use DEVICE_ATTR_RW
sysfs.h: Use octal permissions
component: add debugfs support
bus: simple-pm-bus: convert bool SIMPLE_PM_BUS to tristate
...
01 Feb, 2018
2 commits
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Pull networking updates from David Miller:
1) Significantly shrink the core networking routing structures. Result
of http://vger.kernel.org/~davem/seoul2017_netdev_keynote.pdf2) Add netdevsim driver for testing various offloads, from Jakub
Kicinski.3) Support cross-chip FDB operations in DSA, from Vivien Didelot.
4) Add a 2nd listener hash table for TCP, similar to what was done for
UDP. From Martin KaFai Lau.5) Add eBPF based queue selection to tun, from Jason Wang.
6) Lockless qdisc support, from John Fastabend.
7) SCTP stream interleave support, from Xin Long.
8) Smoother TCP receive autotuning, from Eric Dumazet.
9) Lots of erspan tunneling enhancements, from William Tu.
10) Add true function call support to BPF, from Alexei Starovoitov.
11) Add explicit support for GRO HW offloading, from Michael Chan.
12) Support extack generation in more netlink subsystems. From Alexander
Aring, Quentin Monnet, and Jakub Kicinski.13) Add 1000BaseX, flow control, and EEE support to mvneta driver. From
Russell King.14) Add flow table abstraction to netfilter, from Pablo Neira Ayuso.
15) Many improvements and simplifications to the NFP driver bpf JIT,
from Jakub Kicinski.16) Support for ipv6 non-equal cost multipath routing, from Ido
Schimmel.17) Add resource abstration to devlink, from Arkadi Sharshevsky.
18) Packet scheduler classifier shared filter block support, from Jiri
Pirko.19) Avoid locking in act_csum, from Davide Caratti.
20) devinet_ioctl() simplifications from Al viro.
21) More TCP bpf improvements from Lawrence Brakmo.
22) Add support for onlink ipv6 route flag, similar to ipv4, from David
Ahern.* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1925 commits)
tls: Add support for encryption using async offload accelerator
ip6mr: fix stale iterator
net/sched: kconfig: Remove blank help texts
openvswitch: meter: Use 64-bit arithmetic instead of 32-bit
tcp_nv: fix potential integer overflow in tcpnv_acked
r8169: fix RTL8168EP take too long to complete driver initialization.
qmi_wwan: Add support for Quectel EP06
rtnetlink: enable IFLA_IF_NETNSID for RTM_NEWLINK
ipmr: Fix ptrdiff_t print formatting
ibmvnic: Wait for device response when changing MAC
qlcnic: fix deadlock bug
tcp: release sk_frag.page in tcp_disconnect
ipv4: Get the address of interface correctly.
net_sched: gen_estimator: fix lockdep splat
net: macb: Handle HRESP error
net/mlx5e: IPoIB, Fix copy-paste bug in flow steering refactoring
ipv6: addrconf: break critical section in addrconf_verify_rtnl()
ipv6: change route cache aging logic
i40e/i40evf: Update DESC_NEEDED value to reflect larger value
bnxt_en: cleanup DIM work on device shutdown
... -
Pull livepatching updates from Jiri Kosina:
- handle 'infinitely'-long sleeping tasks, from Miroslav Benes
- remove 'immediate' feature, as it turns out it doesn't provide the
originally expected semantics, and brings more issues than value* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/livepatching:
livepatch: add locking to force and signal functions
livepatch: Remove immediate feature
livepatch: force transition to finish
livepatch: send a fake signal to all blocking tasks
27 Jan, 2018
1 commit
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Do not build lib/bpf/bpf.o with this Makefile but use the one from the
library directory. This avoid making a buggy bpf.o file (e.g. missing
symbols).This patch is useful if some code (e.g. Landlock tests) needs both the
bpf.o (from tools/lib/bpf) and the bpf_load.o (from samples/bpf).Signed-off-by: Mickaël Salaün
Cc: Alexei Starovoitov
Cc: Daniel Borkmann
Signed-off-by: Daniel Borkmann
24 Jan, 2018
7 commits
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Avoid extra step of setting limit from cmdline and do it directly in
the program.Signed-off-by: John Fastabend
Acked-by: Martin KaFai Lau
Signed-off-by: Daniel Borkmann -
Put client sockets in blocking mode otherwise with sendmsg tests
its easy to overrun the socket buffers which results in the test
being aborted.The original non-blocking was added to handle listen/accept with
a single thread the client/accepted sockets do not need to be
non-blocking.Signed-off-by: John Fastabend
Acked-by: Martin KaFai Lau
Signed-off-by: Daniel Borkmann -
Add a base test that does not use BPF hooks to test baseline case.
Signed-off-by: John Fastabend
Acked-by: Martin KaFai Lau
Signed-off-by: Daniel Borkmann -
Report bytes/sec sent as well as total bytes. Useful to get rough
idea how different configurations and usage patterns perform with
sockmap.Signed-off-by: John Fastabend
Acked-by: Martin KaFai Lau
Signed-off-by: Daniel Borkmann -
Currently for SENDMSG tests first send completes then recv runs. This
does not work well for large data sizes and/or many iterations. So
fork the recv and send handler so that we run both send and recv. In
the future we can add a parameter to do more than a single fork of
tx/rx.With this we can get many GBps of data which helps exercise the
sockmap code.Signed-off-by: John Fastabend
Acked-by: Martin KaFai Lau
Signed-off-by: Daniel Borkmann -
When testing BPF programs using sockmap I often want to have more
control over how sendmsg is exercised. This becomes even more useful
as new sockmap program types are added.This adds a test type option to select type of test to run. Currently,
only "ping" and "sendmsg" are supported, but more can be added as
needed.The new help argument gives the following,
Usage: ./sockmap --cgroup
options:
--help -h
--cgroup -c
--rate -r
--verbose -v
--iov_count -i
--length -l
--test -tSigned-off-by: John Fastabend
Signed-off-by: Daniel Borkmann -
sockmap sample program takes arguments from cmd line but it reads them
in using offsets into the array. Because we want to add more arguments
in the future lets do proper argument handling.Also refactor code to pull apart sock init and ping/pong test. This
allows us to add new tests in the future.Signed-off-by: John Fastabend
Acked-by: Martin KaFai Lau
Signed-off-by: Daniel Borkmann
20 Jan, 2018
1 commit
-
The xdp_redirect_cpu sample have some "builtin" monitoring of the
tracepoints for xdp_cpumap_*, but it is practical to have an external
tool that can monitor these transpoint as an easy way to troubleshoot
an application using XDP + cpumap.Specifically I need such external tool when working on Suricata and
XDP cpumap redirect. Extend the xdp_monitor tool sample with
monitoring of these xdp_cpumap_* tracepoints. Model the output format
like xdp_redirect_cpu.Given I needed to handle per CPU decoding for cpumap, this patch also
add per CPU info on the existing monitor events. This resembles part
of the builtin monitoring output from sample xdp_rxq_info. Thus, also
covering part of that sample in an external monitoring tool.Performance wise, the cpumap tracepoints uses bulking, which cause
them to have very little overhead. Thus, they are enabled by default.Signed-off-by: Jesper Dangaard Brouer
Signed-off-by: Daniel Borkmann
18 Jan, 2018
1 commit
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Improve the 'unknown reason' comment, with an actual explaination of why
the ctx pkt-data pointers need to be loaded after the helper function
bpf_xdp_adjust_meta(). Based on the explaination Daniel gave.Fixes: 36e04a2d78d9 ("samples/bpf: xdp2skb_meta shows transferring info from XDP to SKB")
Reported-by: Daniel Borkmann
Signed-off-by: Jesper Dangaard Brouer
Signed-off-by: Daniel Borkmann
17 Jan, 2018
1 commit
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The trailing semicolon is an empty statement that does no operation.
Removing it since it doesn't do anything.Signed-off-by: Luis de Bethencourt
Signed-off-by: Daniel Borkmann
11 Jan, 2018
2 commits
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Immediate flag has been used to disable per-task consistency and patch
all tasks immediately. It could be useful if the patch doesn't change any
function or data semantics.However, it causes problems on its own. The consistency problem is
currently broken with respect to immediate patches.func a
patches 1i
2i
3When the patch 3 is applied, only 2i function is checked (by stack
checking facility). There might be a task sleeping in 1i though. Such
task is migrated to 3, because we do not check 1i in
klp_check_stack_func() at all.Coming atomic replace feature would be easier to implement and more
reliable without immediate.Thus, remove immediate feature completely and save us from the problems.
Note that force feature has the similar problem. However it is
considered as a last resort. If used, administrator should not apply any
new live patches and should plan for reboot into an updated kernel.The architectures would now need to provide HAVE_RELIABLE_STACKTRACE to
fully support livepatch.Signed-off-by: Miroslav Benes
Acked-by: Josh Poimboeuf
Signed-off-by: Jiri Kosina -
Creating a bpf sample that shows howto use the XDP 'data_meta'
infrastructure, created by Daniel Borkmann. Very few drivers support
this feature, but I wanted a functional sample to begin with, when
working on adding driver support.XDP data_meta is about creating a communication channel between BPF
programs. This can be XDP tail-progs, but also other SKB based BPF
hooks, like in this case the TC clsact hook. In this sample I show
that XDP can store info named "mark", and TC/clsact chooses to use
this info and store it into the skb->mark.It is a bit annoying that XDP and TC samples uses different tools/libs
when attaching their BPF hooks. As the XDP and TC programs need to
cooperate and agree on a struct-layout, it is best/easiest if the two
programs can be contained within the same BPF restricted-C file.As the bpf-loader, I choose to not use bpf_load.c (or libbpf), but
instead wrote a bash shell scripted named xdp2skb_meta.sh, which
demonstrate howto use the iproute cmdline tools 'tc' and 'ip' for
loading BPF programs. To make it easy for first time users, the shell
script have command line parsing, and support --verbose and --dry-run
mode, if you just want to see/learn the tc+ip command syntax:# ./xdp2skb_meta.sh --dev ixgbe2 --dry-run
# Dry-run mode: enable VERBOSE and don't call TC+IP
tc qdisc del dev ixgbe2 clsact
tc qdisc add dev ixgbe2 clsact
tc filter add dev ixgbe2 ingress prio 1 handle 1 bpf da obj ./xdp2skb_meta_kern.o sec tc_mark
# Flush XDP on device: ixgbe2
ip link set dev ixgbe2 xdp off
ip link set dev ixgbe2 xdp obj ./xdp2skb_meta_kern.o sec xdp_markSigned-off-by: Jesper Dangaard Brouer
Signed-off-by: Daniel Borkmann
06 Jan, 2018
1 commit
-
This sample program can be used for monitoring and reporting how many
packets per sec (pps) are received per NIC RX queue index and which
CPU processed the packet. In itself it is a useful tool for quickly
identifying RSS imbalance issues, see below.The default XDP action is XDP_PASS in-order to provide a monitor
mode. For benchmarking purposes it is possible to specify other XDP
actions on the cmdline --action.Output below shows an imbalance RSS case where most RXQ's deliver to
CPU-0 while CPU-2 only get packets from a single RXQ. Looking at
things from a CPU level the two CPUs are processing approx the same
amount, BUT looking at the rx_queue_index levels it is clear that
RXQ-2 receive much better service, than other RXQs which all share CPU-0.Running XDP on dev:i40e1 (ifindex:3) action:XDP_PASS
XDP stats CPU pps issue-pps
XDP-RX CPU 0 900,473 0
XDP-RX CPU 2 906,921 0
XDP-RX CPU total 1,807,395RXQ stats RXQ:CPU pps issue-pps
rx_queue_index 0:0 180,098 0
rx_queue_index 0:sum 180,098
rx_queue_index 1:0 180,098 0
rx_queue_index 1:sum 180,098
rx_queue_index 2:2 906,921 0
rx_queue_index 2:sum 906,921
rx_queue_index 3:0 180,098 0
rx_queue_index 3:sum 180,098
rx_queue_index 4:0 180,082 0
rx_queue_index 4:sum 180,082
rx_queue_index 5:0 180,093 0
rx_queue_index 5:sum 180,093Signed-off-by: Jesper Dangaard Brouer
Signed-off-by: Alexei Starovoitov
18 Dec, 2017
1 commit
-
Daniel Borkmann says:
====================
pull-request: bpf-next 2017-12-18The following pull-request contains BPF updates for your *net-next* tree.
The main changes are:
1) Allow arbitrary function calls from one BPF function to another BPF function.
As of today when writing BPF programs, __always_inline had to be used in
the BPF C programs for all functions, unnecessarily causing LLVM to inflate
code size. Handle this more naturally with support for BPF to BPF calls
such that this __always_inline restriction can be overcome. As a result,
it allows for better optimized code and finally enables to introduce core
BPF libraries in the future that can be reused out of different projects.
x86 and arm64 JIT support was added as well, from Alexei.2) Add infrastructure for tagging functions as error injectable and allow for
BPF to return arbitrary error values when BPF is attached via kprobes on
those. This way of injecting errors generically eases testing and debugging
without having to recompile or restart the kernel. Tags for opting-in for
this facility are added with BPF_ALLOW_ERROR_INJECTION(), from Josef.3) For BPF offload via nfp JIT, add support for bpf_xdp_adjust_head() helper
call for XDP programs. First part of this work adds handling of BPF
capabilities included in the firmware, and the later patches add support
to the nfp verifier part and JIT as well as some small optimizations,
from Jakub.4) The bpftool now also gets support for basic cgroup BPF operations such
as attaching, detaching and listing current BPF programs. As a requirement
for the attach part, bpftool can now also load object files through
'bpftool prog load'. This reuses libbpf which we have in the kernel tree
as well. bpftool-cgroup man page is added along with it, from Roman.5) Back then commit e87c6bc3852b ("bpf: permit multiple bpf attachments for
a single perf event") added support for attaching multiple BPF programs
to a single perf event. Given they are configured through perf's ioctl()
interface, the interface has been extended with a PERF_EVENT_IOC_QUERY_BPF
command in this work in order to return an array of one or multiple BPF
prog ids that are currently attached, from Yonghong.6) Various minor fixes and cleanups to the bpftool's Makefile as well
as a new 'uninstall' and 'doc-uninstall' target for removing bpftool
itself or prior installed documentation related to it, from Quentin.7) Add CONFIG_CGROUP_BPF=y to the BPF kernel selftest config file which is
required for the test_dev_cgroup test case to run, from Naresh.8) Fix reporting of XDP prog_flags for nfp driver, from Jakub.
9) Fix libbpf's exit code from the Makefile when libelf was not found in
the system, also from Jakub.
====================Signed-off-by: David S. Miller