https://github.com/torvalds/linux
after 'police' configuration parameters were converted to use RCU instead of spinlock, the state variables used to compute the traffic rate (namely 'tcfp_toks', 'tcfp_ptoks' and 'tcfp_t_c') are erroneously read/updated in the traffic path without any protection. Use a dedicated spinlock to avoid race conditions on these variables, and ensure proper cache-line alignment. In this way, 'police' is still faster than what we observed when 'tcf_lock' was used in the traffic path _ i.e. reverting commit 2d550dbad83c ("net/sched: act_police: don't use spinlock in the data path"). Moreover, we preserve the throughput improvement that was obtained after 'police' started using per-cpu counters, when 'avrate' is used instead of 'rate'. Changes since v1 (thanks to Eric Dumazet): - call ktime_get_ns() before acquiring the lock in the traffic path - use a dedicated spinlock instead of tcf_lock - improve cache-line usage Fixes: 2d550dbad83c ("net/sched: act_police: don't use spinlock in the data path") Reported-and-suggested-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Davide Caratti <dcaratti@redhat.com> Reviewed-by: Eric Dumazet <edumazet@google.com>
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- v2.6.19-rc1
- v2.6.19
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- v2.6.12
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net/sched: act_police: fix race condition on state variables
File | Mode | Size |
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alpha | ||
arc | ||
arm | ||
arm64 | ||
c6x | ||
csky | ||
h8300 | ||
hexagon | ||
ia64 | ||
m68k | ||
microblaze | ||
mips | ||
nds32 | ||
nios2 | ||
openrisc | ||
parisc | ||
powerpc | ||
riscv | ||
s390 | ||
sh | ||
sparc | ||
um | ||
unicore32 | ||
x86 | ||
xtensa | ||
.gitignore | -rw-r--r-- | 12 bytes |
Kconfig | -rw-r--r-- | 26.4 KB |
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