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wireguard: receive: use ring buffer for incoming handshakes

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commit 886fcee939adb5e2af92741b90643a59f2b54f97 upstream.

Apparently the spinlock on incoming_handshake's skb_queue is highly
contended, and a torrent of handshake or cookie packets can bring the
data plane to its knees, simply by virtue of enqueueing the handshake
packets to be processed asynchronously. So, we try switching this to a
ring buffer to hopefully have less lock contention. This alleviates the
problem somewhat, though it still isn't perfect, so future patches will
have to improve this further. However, it at least doesn't completely
diminish the data plane.

Reported-by: Streun Fabio <fstreun@student.ethz.ch>
Reported-by: Joel Wanner <joel.wanner@inf.ethz.ch>
Fixes: e7096c131e ("net: WireGuard secure network tunnel")
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jason A. Donenfeld
2021-11-29 10:39:26 -05:00
committed by Greg Kroah-Hartman
parent e3be118327
commit 8a29a50dbd
5 changed files with 37 additions and 43 deletions
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2
drivers/net/wireguard/queueing.h
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@@ -23,7 +23,7 @@ struct sk_buff;
/* queueing.c APIs: */
int wg_packet_queue_init(struct crypt_queue *queue, work_func_t function,
unsigned int len);
void wg_packet_queue_free(struct crypt_queue *queue);
void wg_packet_queue_free(struct crypt_queue *queue, bool purge);
struct multicore_worker __percpu *
wg_packet_percpu_multicore_worker_alloc(work_func_t function, void *ptr);