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Amery Hung 6611a73b29 bpf: Support specifying linear xdp packet data size for BPF_PROG_TEST_RUN 
[ Upstream commit fe9544ed1a ]

To test bpf_xdp_pull_data(), an xdp packet containing fragments as well
as free linear data area after xdp->data_end needs to be created.
However, bpf_prog_test_run_xdp() always fills the linear area with
data_in before creating fragments, leaving no space to pull data. This
patch will allow users to specify the linear data size through
ctx->data_end.

Currently, ctx_in->data_end must match data_size_in and will not be the
final ctx->data_end seen by xdp programs. This is because ctx->data_end
is populated according to the xdp_buff passed to test_run. The linear
data area available in an xdp_buff, max_linear_sz, is alawys filled up
before copying data_in into fragments.

This patch will allow users to specify the size of data that goes into
the linear area. When ctx_in->data_end is different from data_size_in,
only ctx_in->data_end bytes of data will be put into the linear area when
creating the xdp_buff.

While ctx_in->data_end will be allowed to be different from data_size_in,
it cannot be larger than the data_size_in as there will be no data to
copy from user space. If it is larger than the maximum linear data area
size, the layout suggested by the user will not be honored. Data beyond
max_linear_sz bytes will still be copied into fragments.

Finally, since it is possible for a NIC to produce a xdp_buff with empty
linear data area, allow it when calling bpf_test_init() from
bpf_prog_test_run_xdp() so that we can test XDP kfuncs with such
xdp_buff. This is done by moving lower-bound check to callers as most of
them already do except bpf_prog_test_run_skb(). The change also fixes a
bug that allows passing an xdp_buff with data < ETH_HLEN. This can
happen when ctx is used and metadata is at least ETH_HLEN.

Signed-off-by: Amery Hung <ameryhung@gmail.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://patch.msgid.link/20250922233356.3356453-7-ameryhung@gmail.com
Stable-dep-of: e558cca217 ("bpf, test_run: Subtract size of xdp_frame from allowed metadata size")
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-01-17 16:31:27 +01:00
arch riscv: pgtable: Cleanup useless VA_USER_XXX definitions 2026-01-17 16:31:24 +01:00
block block: fix NULL pointer dereference in blk_zone_reset_all_bio_endio() 2026-01-08 10:15:06 +01:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: seqiv - Do not use req->iv after crypto_aead_encrypt 2026-01-08 10:14:32 +01:00
Documentation soundwire: stream: extend sdw_alloc_stream() to take 'type' parameter 2026-01-08 10:15:04 +01:00
drivers net: enetc: fix build warning when PAGE_SIZE is greater than 128K 2026-01-17 16:31:25 +01:00
fs btrfs: fix beyond-EOF write handling 2026-01-17 16:31:26 +01:00
include netdev: preserve NETIF_F_ALL_FOR_ALL across TSO updates 2026-01-17 16:31:23 +01:00
init init: handle bootloader identifier in kernel parameters 2025-10-19 16:33:50 +02:00
io_uring io_uring: fix min_wait wakeups for SQPOLL 2026-01-08 10:14:25 +01:00
ipc ipc: fix to protect IPCS lookups using RCU 2025-06-27 11:11:22 +01:00
kernel sched/fair: Proportional newidle balance 2026-01-11 15:25:21 +01:00
lib lib/crypto: aes: Fix missing MMU protection for AES S-box 2026-01-17 16:31:16 +01:00
LICENSES LICENSES: add 0BSD license text 2024-09-01 20:43:24 -07:00
mm mm/page_alloc: change all pageblocks migrate type on coalescing 2026-01-11 15:25:20 +01:00
net bpf: Support specifying linear xdp packet data size for BPF_PROG_TEST_RUN 2026-01-17 16:31:27 +01:00
rust rust: kbuild: workaround rustdoc doctests modifier bug 2025-11-24 10:36:07 +01:00
samples samples/ftrace: Adjust LoongArch register restore order in direct calls 2026-01-08 10:14:50 +01:00
scripts kbuild: fix compilation of dtb specified on command-line without make rule 2026-01-08 10:14:34 +01:00
security KEYS: trusted: Fix a memory leak in tpm2_load_cmd 2026-01-08 10:14:13 +01:00
sound ALSA: ac97: fix a double free in snd_ac97_controller_register() 2026-01-17 16:31:26 +01:00
tools bpf: Support specifying linear xdp packet data size for BPF_PROG_TEST_RUN 2026-01-17 16:31:27 +01:00
usr kbuild: uapi: Strip comments before size type check 2025-11-13 15:34:35 -05:00
virt KVM: Disallow toggling KVM_MEM_GUEST_MEMFD on an existing memslot 2026-01-08 10:14:21 +01:00
.clang-format clang-format: Update with v6.11-rc1's for_each macro list 2024-08-02 13:20:31 +02:00
.clippy.toml rust: give Clippy the minimum supported Rust version 2025-08-01 09:48:44 +01:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore Add Jeff Kirsher to .get_maintainer.ignore 2024-03-08 11:36:54 +00:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore rust: introduce .clippy.toml 2025-03-13 13:01:42 +01:00
.mailmap mailmap: add entry for Thorsten Blum 2024-11-07 14:14:59 -08:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Remove self from DSA entry 2024-11-03 12:52:38 -08:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS staging: rtl8712: Remove driver using deprecated API wext 2025-12-07 06:25:02 +09:00
Makefile Linux 6.12.65 2026-01-11 15:25:22 +01:00
README README: Fix spelling 2024-03-18 03:36:32 -06:00

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 reStructuredText 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.