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Filename Latest commit message Latest commit date
Dongdong Wang ca49d919d7 lwt: Disable BH too in run_lwt_bpf() 
[ Upstream commit d9054a1ff585ba01029584ab730efc794603d68f ]

The per-cpu bpf_redirect_info is shared among all skb_do_redirect()
and BPF redirect helpers. Callers on RX path are all in BH context,
disabling preemption is not sufficient to prevent BH interruption.

In production, we observed strange packet drops because of the race
condition between LWT xmit and TC ingress, and we verified this issue
is fixed after we disable BH.

Although this bug was technically introduced from the beginning, that
is commit 3a0af8fd61 ("bpf: BPF for lightweight tunnel infrastructure"),
at that time call_rcu() had to be call_rcu_bh() to match the RCU context.
So this patch may not work well before RCU flavor consolidation has been
completed around v5.0.

Update the comments above the code too, as call_rcu() is now BH friendly.

Signed-off-by: Dongdong Wang <wangdongdong.6@bytedance.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Reviewed-by: Cong Wang <cong.wang@bytedance.com>
Link: https://lore.kernel.org/bpf/20201205075946.497763-1-xiyou.wangcong@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-12-30 11:51:30 +01:00
arch ARM: sunxi: Add machine match for the Allwinner V3 SoC 2020-12-30 11:51:29 +01:00
block blk-mq: In blk_mq_dispatch_rq_list() "no budget" is a reason to kick 2020-12-30 11:50:54 +01:00
certs
crypto crypto: af_alg - avoid undefined behavior accessing salg_name 2020-12-30 11:51:00 +01:00
Documentation
drivers clk: sunxi-ng: Make sure divider tables have sentinel 2020-12-30 11:51:29 +01:00
fs ubifs: Fix error return code in ubifs_init_authentication() 2020-12-30 11:51:25 +01:00
include fix namespaced fscaps when !CONFIG_SECURITY 2020-12-30 11:51:30 +01:00
init
ipc
kernel bpf: Fix bpf_put_raw_tracepoint()'s use of __module_address() 2020-12-30 11:51:18 +01:00
lib
LICENSES
mm mm: don't wake kswapd prematurely when watermark boosting is disabled 2020-12-30 11:51:27 +01:00
net lwt: Disable BH too in run_lwt_bpf() 2020-12-30 11:51:30 +01:00
samples samples: bpf: Fix lwt_len_hist reusing previous BPF map 2020-12-30 11:51:12 +01:00
scripts kconfig: fix return value of do_error_if() 2020-12-30 11:51:29 +01:00
security selinux: fix inode_doinit_with_dentry() LABEL_INVALID error handling 2020-12-30 11:51:05 +01:00
sound ASoC: wm_adsp: remove "ctl" from list on error in wm_adsp_create_control() 2020-12-30 11:51:25 +01:00
tools perf probe: Fix memory leak when synthesizing SDT probes 2020-12-30 11:51:29 +01:00
usr
virt
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Makefile Linux 5.4.85 2020-12-21 13:27:07 +01:00
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.