wireguard: queueing: use saner cpu selection wrapping

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commit 7387943fa3 upstream.

Using `% nr_cpumask_bits` is slow and complicated, and not totally
robust toward dynamic changes to CPU topologies. Rather than storing the
next CPU in the round-robin, just store the last one, and also return
that value. This simplifies the loop drastically into a much more common
pattern.

Fixes: e7096c131e ("net: WireGuard secure network tunnel")
Cc: stable@vger.kernel.org
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Tested-by: Manuel Leiner <manuel.leiner@gmx.de>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Jason A. Donenfeld 2023-07-03 03:27:04 +02:00 • committed by Greg Kroah-Hartman

parent 40f83dd66a

commit 561aaadf0d

4 changed files with 14 additions and 16 deletions

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1

drivers/net/wireguard/queueing.c

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25

drivers/net/wireguard/queueing.h

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2

drivers/net/wireguard/receive.c

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2

drivers/net/wireguard/send.c

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