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Maciej Fijalkowski d678cbd2f8 xsk: Fix handling of invalid descriptors in XSK TX batching API
xdpxceiver run on a AF_XDP ZC enabled driver revealed a problem with XSK
Tx batching API. There is a test that checks how invalid Tx descriptors
are handled by AF_XDP. Each valid descriptor is followed by invalid one
on Tx side whereas the Rx side expects only to receive a set of valid
descriptors.

In current xsk_tx_peek_release_desc_batch() function, the amount of
available descriptors is hidden inside xskq_cons_peek_desc_batch(). This
can be problematic in cases where invalid descriptors are present due to
the fact that xskq_cons_peek_desc_batch() returns only a count of valid
descriptors. This means that it is impossible to properly update XSK
ring state when calling xskq_cons_release_n().

To address this issue, pull out the contents of
xskq_cons_peek_desc_batch() so that callers (currently only
xsk_tx_peek_release_desc_batch()) will always be able to update the
state of ring properly, as total count of entries is now available and
use this value as an argument in xskq_cons_release_n(). By
doing so, xskq_cons_peek_desc_batch() can be dropped altogether.

Fixes: 9349eb3a9d ("xsk: Introduce batched Tx descriptor interfaces")
Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Magnus Karlsson <magnus.karlsson@intel.com>
Link: https://lore.kernel.org/bpf/20220607142200.576735-1-maciej.fijalkowski@intel.com
2022-06-08 16:20:07 +02:00
arch bpf, arm64: Clear prog->jited_len along prog->jited 2022-06-07 10:40:53 -07:00
block Page cache changes for 5.19 2022-05-24 19:55:07 -07:00
certs Kbuild updates for v5.19 2022-05-26 12:09:50 -07:00
crypto This update includes the following changes: 2022-05-27 18:06:49 -07:00
Documentation Networking fixes for 5.19-rc1, including fixes from bpf, and netfilter. 2022-06-02 12:50:16 -07:00
drivers stmmac: intel: Fix an error handling path in intel_eth_pci_probe() 2022-06-07 11:56:29 +02:00
fs A big pile of assorted fixes and improvements for the filesystem with 2022-06-02 08:59:39 -07:00
include Networking fixes for 5.19-rc1, including fixes from bpf, and netfilter. 2022-06-02 12:50:16 -07:00
init RISC-V Patches for the 5.19 Merge Window, Part 1 2022-05-31 14:10:54 -07:00
ipc ipc/mqueue: use get_tree_nodev() in mqueue_get_tree() 2022-05-09 18:29:21 -07:00
kernel bpf: Fix calling global functions from BPF_PROG_TYPE_EXT programs 2022-06-07 10:41:20 -07:00
lib assoc_array: Fix BUG_ON during garbage collect 2022-06-01 18:29:06 -07:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm RISC-V Patches for the 5.19 Merge Window, Part 1 2022-05-31 14:10:54 -07:00
net xsk: Fix handling of invalid descriptors in XSK TX batching API 2022-06-08 16:20:07 +02:00
samples drm for 5.19-rc1 2022-05-25 16:18:27 -07:00
scripts Not a lot of material this cycle. Many singleton patches against various 2022-05-27 11:22:03 -07:00
security linux-kselftest-kunit-5.19-rc1 2022-05-25 11:32:53 -07:00
sound m68knommu: changes for linux 5.19 2022-05-30 10:56:18 -07:00
tools selftests/bpf: Add selftest for calling global functions from freplace 2022-06-07 10:41:20 -07:00
usr Not a lot of material this cycle. Many singleton patches against various 2022-05-27 11:22:03 -07:00
virt VFIO updates for v5.19-rc1 2022-06-01 13:49:15 -07:00
.clang-format clang-format: Fix space after for_each macros 2022-05-20 19:27:16 +02:00
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore kbuild: split the second line of *.mod into *.usyms 2022-05-08 03:16:59 +09:00
.mailmap MAINTAINERS: Update Lorenzo Pieralisi's email address 2022-05-31 15:06:19 -05:00
COPYING
CREDITS MAINTAINERS: replace a Microchip AT91 maintainer 2022-02-09 11:30:01 +01:00
Kbuild
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS pci-v5.19-fixes-1 2022-06-02 12:11:25 -07:00
Makefile Kbuild updates for v5.19 2022-05-26 12:09:50 -07:00
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 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.