diff options
Diffstat (limited to 'target/linux/generic/backport-5.4/080-wireguard-0100-wireguard-send-receive-cond_resched-when-processing-.patch')
| -rw-r--r-- | target/linux/generic/backport-5.4/080-wireguard-0100-wireguard-send-receive-cond_resched-when-processing-.patch | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/target/linux/generic/backport-5.4/080-wireguard-0100-wireguard-send-receive-cond_resched-when-processing-.patch b/target/linux/generic/backport-5.4/080-wireguard-0100-wireguard-send-receive-cond_resched-when-processing-.patch new file mode 100644 index 0000000000..a87a383981 --- /dev/null +++ b/target/linux/generic/backport-5.4/080-wireguard-0100-wireguard-send-receive-cond_resched-when-processing-.patch @@ -0,0 +1,58 @@ +From 3943211e0997b04f1e2ca1a6624391cc72a176bc Mon Sep 17 00:00:00 2001 +From: "Jason A. Donenfeld" <Jason@zx2c4.com> +Date: Wed, 6 May 2020 15:33:04 -0600 +Subject: [PATCH 100/124] wireguard: send/receive: cond_resched() when + processing worker ringbuffers + +commit 4005f5c3c9d006157ba716594e0d70c88a235c5e upstream. + +Users with pathological hardware reported CPU stalls on CONFIG_ +PREEMPT_VOLUNTARY=y, because the ringbuffers would stay full, meaning +these workers would never terminate. That turned out not to be okay on +systems without forced preemption, which Sultan observed. This commit +adds a cond_resched() to the bottom of each loop iteration, so that +these workers don't hog the core. Note that we don't need this on the +napi poll worker, since that terminates after its budget is expended. + +Suggested-by: Sultan Alsawaf <sultan@kerneltoast.com> +Reported-by: Wang Jian <larkwang@gmail.com> +Fixes: e7096c131e51 ("net: WireGuard secure network tunnel") +Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> +Signed-off-by: David S. Miller <davem@davemloft.net> +Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> +--- + drivers/net/wireguard/receive.c | 2 ++ + drivers/net/wireguard/send.c | 4 ++++ + 2 files changed, 6 insertions(+) + +--- a/drivers/net/wireguard/receive.c ++++ b/drivers/net/wireguard/receive.c +@@ -516,6 +516,8 @@ void wg_packet_decrypt_worker(struct wor + &PACKET_CB(skb)->keypair->receiving)) ? + PACKET_STATE_CRYPTED : PACKET_STATE_DEAD; + wg_queue_enqueue_per_peer_napi(skb, state); ++ if (need_resched()) ++ cond_resched(); + } + } + +--- a/drivers/net/wireguard/send.c ++++ b/drivers/net/wireguard/send.c +@@ -281,6 +281,8 @@ void wg_packet_tx_worker(struct work_str + + wg_noise_keypair_put(keypair, false); + wg_peer_put(peer); ++ if (need_resched()) ++ cond_resched(); + } + } + +@@ -304,6 +306,8 @@ void wg_packet_encrypt_worker(struct wor + } + wg_queue_enqueue_per_peer(&PACKET_PEER(first)->tx_queue, first, + state); ++ if (need_resched()) ++ cond_resched(); + } + } + |