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59 lines
2.0 KiB
Diff
59 lines
2.0 KiB
Diff
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: "Jason A. Donenfeld" <Jason@zx2c4.com>
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Date: Wed, 6 May 2020 15:33:04 -0600
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Subject: [PATCH] wireguard: send/receive: cond_resched() when processing
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worker ringbuffers
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commit 4005f5c3c9d006157ba716594e0d70c88a235c5e upstream.
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Users with pathological hardware reported CPU stalls on CONFIG_
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PREEMPT_VOLUNTARY=y, because the ringbuffers would stay full, meaning
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these workers would never terminate. That turned out not to be okay on
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systems without forced preemption, which Sultan observed. This commit
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adds a cond_resched() to the bottom of each loop iteration, so that
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these workers don't hog the core. Note that we don't need this on the
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napi poll worker, since that terminates after its budget is expended.
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Suggested-by: Sultan Alsawaf <sultan@kerneltoast.com>
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Reported-by: Wang Jian <larkwang@gmail.com>
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Fixes: e7096c131e51 ("net: WireGuard secure network tunnel")
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Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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---
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drivers/net/wireguard/receive.c | 2 ++
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drivers/net/wireguard/send.c | 4 ++++
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2 files changed, 6 insertions(+)
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--- a/drivers/net/wireguard/receive.c
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+++ b/drivers/net/wireguard/receive.c
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@@ -516,6 +516,8 @@ void wg_packet_decrypt_worker(struct wor
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&PACKET_CB(skb)->keypair->receiving)) ?
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PACKET_STATE_CRYPTED : PACKET_STATE_DEAD;
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wg_queue_enqueue_per_peer_napi(skb, state);
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+ if (need_resched())
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+ cond_resched();
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}
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}
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--- a/drivers/net/wireguard/send.c
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+++ b/drivers/net/wireguard/send.c
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@@ -281,6 +281,8 @@ void wg_packet_tx_worker(struct work_str
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wg_noise_keypair_put(keypair, false);
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wg_peer_put(peer);
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+ if (need_resched())
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+ cond_resched();
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}
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}
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@@ -304,6 +306,8 @@ void wg_packet_encrypt_worker(struct wor
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}
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wg_queue_enqueue_per_peer(&PACKET_PEER(first)->tx_queue, first,
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state);
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+ if (need_resched())
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+ cond_resched();
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}
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}
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