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Message-ID: <20240607070427.1379327-12-bigeasy@linutronix.de>
Date: Fri, 7 Jun 2024 08:53:14 +0200
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: linux-kernel@...r.kernel.org,
netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
Daniel Bristot de Oliveira <bristot@...nel.org>,
Boqun Feng <boqun.feng@...il.com>,
Daniel Borkmann <daniel@...earbox.net>,
Eric Dumazet <edumazet@...gle.com>,
Frederic Weisbecker <frederic@...nel.org>,
Ingo Molnar <mingo@...hat.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Peter Zijlstra <peterz@...radead.org>,
Thomas Gleixner <tglx@...utronix.de>,
Waiman Long <longman@...hat.com>,
Will Deacon <will@...nel.org>,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
bpf@...r.kernel.org
Subject: [PATCH v5 net-next 11/15] lwt: Don't disable migration prio invoking BPF.
There is no need to explicitly disable migration if bottom halves are
also disabled. Disabling BH implies disabling migration.
Remove migrate_disable() and rely solely on disabling BH to remain on
the same CPU.
Cc: bpf@...r.kernel.org
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
net/core/lwt_bpf.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/net/core/lwt_bpf.c b/net/core/lwt_bpf.c
index 4a0797f0a154b..a94943681e5aa 100644
--- a/net/core/lwt_bpf.c
+++ b/net/core/lwt_bpf.c
@@ -40,10 +40,9 @@ static int run_lwt_bpf(struct sk_buff *skb, struct bpf_lwt_prog *lwt,
{
int ret;
- /* Migration disable and BH disable are needed to protect per-cpu
- * redirect_info between BPF prog and skb_do_redirect().
+ /* Disabling BH is needed to protect per-CPU bpf_redirect_info between
+ * BPF prog and skb_do_redirect().
*/
- migrate_disable();
local_bh_disable();
bpf_compute_data_pointers(skb);
ret = bpf_prog_run_save_cb(lwt->prog, skb);
@@ -78,7 +77,6 @@ static int run_lwt_bpf(struct sk_buff *skb, struct bpf_lwt_prog *lwt,
}
local_bh_enable();
- migrate_enable();
return ret;
}
--
2.45.1
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