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Revision tags: v6.6.67, v6.6.66, v6.6.65, v6.6.64, v6.6.63, v6.6.62, v6.6.61, v6.6.60, v6.6.59, v6.6.58, v6.6.57, v6.6.56, v6.6.55, v6.6.54, v6.6.53, v6.6.52, v6.6.51, v6.6.50, v6.6.49, v6.6.48, v6.6.47, v6.6.46, v6.6.45, v6.6.44, v6.6.43, v6.6.42, v6.6.41, v6.6.40, v6.6.39, v6.6.38, v6.6.37, v6.6.36, v6.6.35, v6.6.34, v6.6.33, v6.6.32, v6.6.31, v6.6.30, v6.6.29, v6.6.28, v6.6.27, v6.6.26, v6.6.25, v6.6.24, v6.6.23, v6.6.16, v6.6.15, v6.6.14, v6.6.13, v6.6.12, v6.6.11, v6.6.10, v6.6.9, v6.6.8, v6.6.7, v6.6.6, v6.6.5, v6.6.4, v6.6.3, v6.6.2, v6.5.11, v6.6.1, v6.5.10, v6.6, v6.5.9, v6.5.8, v6.5.7, v6.5.6, v6.5.5, v6.5.4, v6.5.3, v6.5.2, v6.1.51, v6.5.1, v6.1.50, v6.5, v6.1.49, v6.1.48, v6.1.46, v6.1.45, v6.1.44, v6.1.43, v6.1.42, v6.1.41, v6.1.40, v6.1.39, v6.1.38, v6.1.37, v6.1.36, v6.4, v6.1.35, v6.1.34, v6.1.33, v6.1.32, v6.1.31, v6.1.30, v6.1.29, v6.1.28, v6.1.27, v6.1.26, v6.3, v6.1.25, v6.1.24, v6.1.23, v6.1.22, v6.1.21, v6.1.20, v6.1.19, v6.1.18, v6.1.17, v6.1.16, v6.1.15, v6.1.14, v6.1.13, v6.2, v6.1.12, v6.1.11, v6.1.10, v6.1.9, v6.1.8, v6.1.7, v6.1.6, v6.1.5, v6.0.19, v6.0.18, v6.1.4, v6.1.3, v6.0.17, v6.1.2, v6.0.16, v6.1.1, v6.0.15, v6.0.14, v6.0.13, v6.1, v6.0.12, v6.0.11, v6.0.10, v5.15.80, v6.0.9, v5.15.79, v6.0.8, v5.15.78, v6.0.7, v5.15.77, v5.15.76, v6.0.6, v6.0.5, v5.15.75, v6.0.4, v6.0.3, v6.0.2, v5.15.74, v5.15.73, v6.0.1, v5.15.72, v6.0, v5.15.71, v5.15.70, v5.15.69, v5.15.68, v5.15.67, v5.15.66, v5.15.65, v5.15.64, v5.15.63, v5.15.62, v5.15.61, v5.15.60, v5.15.59, v5.19, v5.15.58, v5.15.57, v5.15.56, v5.15.55, v5.15.54, v5.15.53, v5.15.52, v5.15.51, v5.15.50, v5.15.49, v5.15.48, v5.15.47, v5.15.46, v5.15.45, v5.15.44, v5.15.43, v5.15.42, v5.18, v5.15.41, v5.15.40, v5.15.39, v5.15.38, v5.15.37, v5.15.36, v5.15.35, v5.15.34, v5.15.33, v5.15.32, v5.15.31, v5.17, v5.15.30, v5.15.29, v5.15.28, v5.15.27, v5.15.26, v5.15.25, v5.15.24, v5.15.23, v5.15.22, v5.15.21, v5.15.20, v5.15.19, v5.15.18, v5.15.17, v5.4.173, v5.15.16, v5.15.15, v5.16, v5.15.10, v5.15.9, v5.15.8, v5.15.7, v5.15.6, v5.15.5, v5.15.4, v5.15.3, v5.15.2, v5.15.1, v5.15, v5.14.14, v5.14.13, v5.14.12, v5.14.11, v5.14.10, v5.14.9, v5.14.8, v5.14.7, v5.14.6, v5.10.67, v5.10.66, v5.14.5, v5.14.4, v5.10.65, v5.14.3, v5.10.64, v5.14.2, v5.10.63, v5.14.1, v5.10.62, v5.14, v5.10.61, v5.10.60, v5.10.53, v5.10.52, v5.10.51, v5.10.50, v5.10.49, v5.13, v5.10.46, v5.10.43, v5.10.42, v5.10.41, v5.10.40, v5.10.39, v5.4.119, v5.10.36, v5.10.35, v5.10.34, v5.4.116, v5.10.33, v5.12, v5.10.32, v5.10.31, v5.10.30, v5.10.27, v5.10.26, v5.10.25, v5.10.24, v5.10.23, v5.10.22, v5.10.21, v5.10.20, v5.10.19, v5.4.101, v5.10.18, v5.10.17, v5.11, v5.10.16, v5.10.15, v5.10.14 |
| #
cb8e59cc |
| 03-Jun-2020 |
Linus Torvalds <torvalds@linux-foundation.org> |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next
Pull networking updates from David Miller:
1) Allow setting bluetooth L2CAP modes via socket option, from Luiz
Augusto von D
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next
Pull networking updates from David Miller:
1) Allow setting bluetooth L2CAP modes via socket option, from Luiz
Augusto von Dentz.
2) Add GSO partial support to igc, from Sasha Neftin.
3) Several cleanups and improvements to r8169 from Heiner Kallweit.
4) Add IF_OPER_TESTING link state and use it when ethtool triggers a
device self-test. From Andrew Lunn.
5) Start moving away from custom driver versions, use the globally
defined kernel version instead, from Leon Romanovsky.
6) Support GRO vis gro_cells in DSA layer, from Alexander Lobakin.
7) Allow hard IRQ deferral during NAPI, from Eric Dumazet.
8) Add sriov and vf support to hinic, from Luo bin.
9) Support Media Redundancy Protocol (MRP) in the bridging code, from
Horatiu Vultur.
10) Support netmap in the nft_nat code, from Pablo Neira Ayuso.
11) Allow UDPv6 encapsulation of ESP in the ipsec code, from Sabrina
Dubroca. Also add ipv6 support for espintcp.
12) Lots of ReST conversions of the networking documentation, from Mauro
Carvalho Chehab.
13) Support configuration of ethtool rxnfc flows in bcmgenet driver,
from Doug Berger.
14) Allow to dump cgroup id and filter by it in inet_diag code, from
Dmitry Yakunin.
15) Add infrastructure to export netlink attribute policies to
userspace, from Johannes Berg.
16) Several optimizations to sch_fq scheduler, from Eric Dumazet.
17) Fallback to the default qdisc if qdisc init fails because otherwise
a packet scheduler init failure will make a device inoperative. From
Jesper Dangaard Brouer.
18) Several RISCV bpf jit optimizations, from Luke Nelson.
19) Correct the return type of the ->ndo_start_xmit() method in several
drivers, it's netdev_tx_t but many drivers were using
'int'. From Yunjian Wang.
20) Add an ethtool interface for PHY master/slave config, from Oleksij
Rempel.
21) Add BPF iterators, from Yonghang Song.
22) Add cable test infrastructure, including ethool interfaces, from
Andrew Lunn. Marvell PHY driver is the first to support this
facility.
23) Remove zero-length arrays all over, from Gustavo A. R. Silva.
24) Calculate and maintain an explicit frame size in XDP, from Jesper
Dangaard Brouer.
25) Add CAP_BPF, from Alexei Starovoitov.
26) Support terse dumps in the packet scheduler, from Vlad Buslov.
27) Support XDP_TX bulking in dpaa2 driver, from Ioana Ciornei.
28) Add devm_register_netdev(), from Bartosz Golaszewski.
29) Minimize qdisc resets, from Cong Wang.
30) Get rid of kernel_getsockopt and kernel_setsockopt in order to
eliminate set_fs/get_fs calls. From Christoph Hellwig.
* git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (2517 commits)
selftests: net: ip_defrag: ignore EPERM
net_failover: fixed rollback in net_failover_open()
Revert "tipc: Fix potential tipc_aead refcnt leak in tipc_crypto_rcv"
Revert "tipc: Fix potential tipc_node refcnt leak in tipc_rcv"
vmxnet3: allow rx flow hash ops only when rss is enabled
hinic: add set_channels ethtool_ops support
selftests/bpf: Add a default $(CXX) value
tools/bpf: Don't use $(COMPILE.c)
bpf, selftests: Use bpf_probe_read_kernel
s390/bpf: Use bcr 0,%0 as tail call nop filler
s390/bpf: Maintain 8-byte stack alignment
selftests/bpf: Fix verifier test
selftests/bpf: Fix sample_cnt shared between two threads
bpf, selftests: Adapt cls_redirect to call csum_level helper
bpf: Add csum_level helper for fixing up csum levels
bpf: Fix up bpf_skb_adjust_room helper's skb csum setting
sfc: add missing annotation for efx_ef10_try_update_nic_stats_vf()
crypto/chtls: IPv6 support for inline TLS
Crypto/chcr: Fixes a coccinile check error
Crypto/chcr: Fixes compilations warnings
...
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|
| #
180139dc |
| 09-May-2020 |
Alexei Starovoitov <ast@kernel.org> |
Merge branch 'bpf_iter'
Yonghong Song says:
====================
Motivation:
The current way to dump kernel data structures mostly:
1. /proc system
2. various specific tools like "ss" whi
Merge branch 'bpf_iter'
Yonghong Song says:
====================
Motivation:
The current way to dump kernel data structures mostly:
1. /proc system
2. various specific tools like "ss" which requires kernel support.
3. drgn
The dropback for the first two is that whenever you want to dump more, you
need change the kernel. For example, Martin wants to dump socket local
storage with "ss". Kernel change is needed for it to work ([1]).
This is also the direct motivation for this work.
drgn ([2]) solves this proble nicely and no kernel change is not needed.
But since drgn is not able to verify the validity of a particular pointer value,
it might present the wrong results in rare cases.
In this patch set, we introduce bpf iterator. Initial kernel changes are
still needed for interested kernel data, but a later data structure change
will not require kernel changes any more. bpf program itself can adapt
to new data structure changes. This will give certain flexibility with
guaranteed correctness.
In this patch set, kernel seq_ops is used to facilitate iterating through
kernel data, similar to current /proc and many other lossless kernel
dumping facilities. In the future, different iterators can be
implemented to trade off losslessness for other criteria e.g. no
repeated object visits, etc.
User Interface:
1. Similar to prog/map/link, the iterator can be pinned into a
path within a bpffs mount point.
2. The bpftool command can pin an iterator to a file
bpftool iter pin <bpf_prog.o> <path>
3. Use `cat <path>` to dump the contents.
Use `rm -f <path>` to remove the pinned iterator.
4. The anonymous iterator can be created as well.
Please see patch #19 andd #20 for bpf programs and bpf iterator
output examples.
Note that certain iterators are namespace aware. For example,
task and task_file targets only iterate through current pid namespace.
ipv6_route and netlink will iterate through current net namespace.
Please see individual patches for implementation details.
Performance:
The bpf iterator provides in-kernel aggregation abilities
for kernel data. This can greatly improve performance
compared to e.g., iterating all process directories under /proc.
For example, I did an experiment on my VM with an application forking
different number of tasks and each forked process opening various number
of files. The following is the result with the latency with unit of microseconds:
# of forked tasks # of open files # of bpf_prog calls # latency (us)
100 100 11503 7586
1000 1000 1013203 709513
10000 100 1130203 764519
The number of bpf_prog calls may be more than forked tasks multipled by
open files since there are other tasks running on the system.
The bpf program is a do-nothing program. One millions of bpf calls takes
less than one second.
Although the initial motivation is from Martin's sk_local_storage,
this patch didn't implement tcp6 sockets and sk_local_storage.
The /proc/net/tcp6 involves three types of sockets, timewait,
request and tcp6 sockets. Some kind of type casting or other
mechanism is needed to handle all these socket types in one
bpf program. This will be addressed in future work.
Currently, we do not support kernel data generated under module.
This requires some BTF work.
More work for more iterators, e.g., tcp, udp, bpf_map elements, etc.
Changelog:
v3 -> v4:
- in bpf_seq_read(), if start() failed with an error, return that
error to user space (Andrii)
- in bpf_seq_printf(), if reading kernel memory failed for
%s and %p{i,I}{4,6}, set buffer to empty string or address 0.
Documented this behavior in uapi header (Andrii)
- fix a few error handling issues for bpftool (Andrii)
- A few other minor fixes and cosmetic changes.
v2 -> v3:
- add bpf_iter_unreg_target() to unregister a target, used in the
error path of the __init functions.
- handle err != 0 before handling overflow (Andrii)
- reference count "task" for task_file target (Andrii)
- remove some redundancy for bpf_map/task/task_file targets
- add bpf_iter_unreg_target() in ip6_route_cleanup()
- Handling "%%" format in bpf_seq_printf() (Andrii)
- implement auto-attach for bpf_iter in libbpf (Andrii)
- add macros offsetof and container_of in bpf_helpers.h (Andrii)
- add tests for auto-attach and program-return-1 cases
- some other minor fixes
v1 -> v2:
- removed target_feature, using callback functions instead
- checking target to ensure program specified btf_id supported (Martin)
- link_create change with new changes from Andrii
- better handling of btf_iter vs. seq_file private data (Martin, Andrii)
- implemented bpf_seq_read() (Andrii, Alexei)
- percpu buffer for bpf_seq_printf() (Andrii)
- better syntax for BPF_SEQ_PRINTF macro (Andrii)
- bpftool fixes (Quentin)
- a lot of other fixes
RFC v2 -> v1:
- rename bpfdump to bpf_iter
- use bpffs instead of a new file system
- use bpf_link to streamline and simplify iterator creation.
References:
[1]: https://lore.kernel.org/bpf/20200225230427.1976129-1-kafai@fb.com
[2]: https://github.com/osandov/drgn
====================
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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