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Michael Chan f17e0c1208 bnxt_en: Fix XDP_TX path 
[ Upstream commit 0373d5c387 ]

For XDP_TX action in bnxt_rx_xdp(), clearing of the event flags is not
correct.  __bnxt_poll_work() -> bnxt_rx_pkt() -> bnxt_rx_xdp() may be
looping within NAPI and some event flags may be set in earlier
iterations.  In particular, if BNXT_TX_EVENT is set earlier indicating
some XDP_TX packets are ready and pending, it will be cleared if it is
XDP_TX action again.  Normally, we will set BNXT_TX_EVENT again when we
successfully call __bnxt_xmit_xdp().  But if the TX ring has no more
room, the flag will not be set.  This will cause the TX producer to be
ahead but the driver will not hit the TX doorbell.

For multi-buf XDP_TX, there is no need to clear the event flags and set
BNXT_AGG_EVENT.  The BNXT_AGG_EVENT flag should have been set earlier in
bnxt_rx_pkt().

The visible symptom of this is that the RX ring associated with the
TX XDP ring will eventually become empty and all packets will be dropped.
Because this condition will cause the driver to not refill the RX ring
seeing that the TX ring has forever pending XDP_TX packets.

The fix is to only clear BNXT_RX_EVENT when we have successfully
called __bnxt_xmit_xdp().

Fixes: 7f0a168b04 ("bnxt_en: Add completion ring pointer in TX and RX ring structures")
Reported-by: Pavel Dubovitsky <pdubovitsky@meta.com>
Reviewed-by: Andy Gospodarek <andrew.gospodarek@broadcom.com>
Reviewed-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Reviewed-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Link: https://patch.msgid.link/20251203003024.2246699-1-michael.chan@broadcom.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-01-02 12:56:45 +01:00
arch x86/microcode: Mark early_parse_cmdline() as __init 2026-01-02 12:56:39 +01:00
block block: Use RCU in blk_mq_[un]quiesce_tagset() instead of set->tag_list_lock 2025-12-18 14:03:40 +01:00
certs sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3 2024-09-20 19:52:48 +03:00
crypto crypto: ahash - Zero positive err value in ahash_update_finish 2025-12-18 14:03:12 +01:00
Documentation docs: hwmon: fix link to g762 devicetree binding 2025-12-18 14:03:38 +01:00
drivers bnxt_en: Fix XDP_TX path 2026-01-02 12:56:45 +01:00
fs gfs2: Fix use of bio_chain 2026-01-02 12:56:43 +01:00
include shmem: fix recovery on rename failures 2026-01-02 12:56:37 +01:00
init printk changes for 6.18 2025-10-04 11:13:11 -07:00
io_uring io_uring/kbuf: use READ_ONCE() for userspace-mapped memory 2025-12-18 14:03:36 +01:00
ipc namespace-6.18-rc1 2025-09-29 11:20:29 -07:00
kernel livepatch: Match old_sympos 0 and 1 in klp_find_func() 2026-01-02 12:56:39 +01:00
lib lib/vsprintf: Check pointer before dereferencing in time_and_date() 2025-12-18 14:02:58 +01:00
LICENSES LICENSES: Replace the obsolete address of the FSF in the GFDL-1.2 2025-07-24 11:15:39 +02:00
mm shmem: fix recovery on rename failures 2026-01-02 12:56:37 +01:00
net net/sched: ets: Always remove class from active list before deleting in ets_qdisc_change 2026-01-02 12:56:43 +01:00
rust rust: Add -fno-isolate-erroneous-paths-dereference to bindgen_skip_c_flags 2025-11-10 08:37:06 +08:00
samples samples: work around glibc redefining some of our defines wrong 2025-11-21 09:29:02 -08:00
scripts kbuild: Use objtree for module signing key path 2026-01-02 12:56:40 +01:00
security landlock: Fix handling of disconnected directories 2025-12-18 14:03:27 +01:00
sound ALSA: wavefront: Fix integer overflow in sample size validation 2025-12-18 14:03:43 +01:00
tools perf stat: Allow no events to open if this is a "--null" run 2025-12-18 14:03:32 +01:00
usr gen_init_cpio: Ignore fsync() returning EINVAL on pipes 2025-10-07 09:53:05 -07:00
virt KVM: guest_memfd: Remove bindings on memslot deletion when gmem is dying 2025-11-04 09:16:53 -08:00
.clang-format memblock: drop for_each_free_mem_pfn_range_in_zone_from() 2025-09-14 08:49:03 +03:00
.clippy.toml rust: clean Rust 1.88.0's warning about clippy::disallowed_macros configuration 2025-05-07 00:11:47 +02:00
.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 MAINTAINERS: remove Alyssa Rosenzweig 2025-09-18 21:17:31 +02:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore .gitignore: ignore compile_commands.json globally 2025-08-12 15:53:55 -07:00
.mailmap 8 hotfixes. 4 are cc:stable, 7 are against mm/. 2025-11-26 12:38:05 -08:00
.pylintrc tools: docs: parse-headers.py: move it from sphinx dir 2025-08-29 15:54:42 -06:00
.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: mark ISDN subsystem as orphan 2025-10-27 17:49:45 -07:00
Kbuild sched: Make migrate_{en,dis}able() inline 2025-09-25 09:57:16 +02:00
Kconfig io_uring: Rename KConfig to Kconfig 2025-02-19 14:53:27 -07:00
MAINTAINERS soc: fixes for 6.18, part 4 2025-11-28 09:57:31 -08:00
Makefile Linux 6.18.2 2025-12-18 14:03:43 +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.