mirror of https://gitee.com/openkylin/linux.git
909e446b32
Yonghong Song says:
====================
Bpf iterator has been implemented for task, task_file,
bpf_map, ipv6_route, netlink, tcp and udp so far.
For map elements, there are two ways to traverse all elements from
user space:
1. using BPF_MAP_GET_NEXT_KEY bpf subcommand to get elements
one by one.
2. using BPF_MAP_LOOKUP_BATCH bpf subcommand to get a batch of
elements.
Both these approaches need to copy data from kernel to user space
in order to do inspection.
This patch implements bpf iterator for map elements.
User can have a bpf program in kernel to run with each map element,
do checking, filtering, aggregation, modifying values etc.
without copying data to user space.
Patch #1 and #2 are refactoring. Patch #3 implements readonly/readwrite
buffer support in verifier. Patches #4 - #7 implements map element
support for hash, percpu hash, lru hash lru percpu hash, array,
percpu array and sock local storage maps. Patches #8 - #9 are libbpf
and bpftool support. Patches #10 - #13 are selftests for implemented
map element iterators.
Changelogs:
v3 -> v4:
. fix a kasan failure triggered by a failed bpf_iter link_create,
not just free_link but need cleanup_link. (Alexei)
v2 -> v3:
. rebase on top of latest bpf-next
v1 -> v2:
. support to modify map element values. (Alexei)
. map key/values can be used with helper arguments
for those arguments with ARG_PTR_TO_MEM or
ARG_PTR_TO_INIT_MEM register type. (Alexei)
. remove usused variable. (kernel test robot)
====================
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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| init | ||
| ipc | ||
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| lib | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
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| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
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| .gitignore | ||
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| README | ||
README
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.