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c0cb86e1d5
Rather than using the clunky, old, slower wireguard-linux-compat out of tree module, this commit does a patch-by-patch backport of upstream's wireguard to 5.4. This specific backport is in widespread use, being part of SUSE's enterprise kernel, Oracle's enterprise kernel, Google's Android kernel, Gentoo's distro kernel, and probably more I've forgotten about. It's definately the "more proper" way of adding wireguard to a kernel than the ugly compat.h hell of the wireguard-linux-compat repo. And most importantly for OpenWRT, it allows using the same module configuration code for 5.10 as for 5.4, with no need for bifurcation. These patches are from the backport tree which is maintained in the open here: https://git.zx2c4.com/wireguard-linux/log/?h=backport-5.4.y I'll be sending PRs to update this as needed. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> (cherry picked from commit3888fa7880) (cherry picked from commitd540725871) (cherry picked from commit196f3d586f) (cherry picked from commit3500fd7938) (cherry picked from commit23b801d3ba) (cherry picked from commit0c0cb97da7) (cherry picked from commit2a27f6f90a) Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
59 lines
2.0 KiB
Diff
59 lines
2.0 KiB
Diff
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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