From patchwork Wed May 29 16:02:34 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sebastian Andrzej Siewior X-Patchwork-Id: 13679212 X-Patchwork-Delegate: kuba@kernel.org Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 461CA194C86; Wed, 29 May 2024 16:29:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717000181; cv=none; b=NjJn7wQe7OkVYqRK6wdye1JGMxqOfkkxVFCjAn+yfzS/Giczbu+VPDVyDSlsWkmZl3Wa5aQfpRFd9CtC/IWjfX+VjQ5MMIIG0qXQoQwoMKcOwBmD+sgPuHmFcrWs3zRYfaMGLQ0WLA2tBHLhqA3l5Rxdp6wF+FGPC3F+a4TAjBQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717000181; c=relaxed/simple; bh=DjKGXeuA0iicBNAujBOCeL9L9FyYM7749w3HflY304w=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=lxd7E0HYBtmf9H2gYM1fKDEfbBaZawhBvy+t/QP4DaHA0wVlnIQQCos5jI1lnx5VZd3EdXOXej6StHStPti0byS8bJj0+JNLoOFSjFcV3vheP4khG7WDi3mgklfGYf0UXBsGlAiLB9cABSE1GetXqD3UR1btJa7o5T3w/nKuRkA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=MdCObOG+; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=VE8oE+W4; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="MdCObOG+"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="VE8oE+W4" From: Sebastian Andrzej Siewior DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1717000177; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=9Rw/2cnJ+Iso5XuGakDzbFuKdfRtLkLToskmRVbIvD0=; b=MdCObOG+J/GpwjR5rYtHkSzuz41aPalaWZJm0fU7js6GXsmPRbpXmUklx5l6mOPMFDFDDY 4f+vJsxRV+DmTHakYeiWMC8MNjtWyJD24+VJPSvxUmUPA+9iMMhTmIZBHcH8fchS13X9w9 mnikWbVIvpVYdR504JtlV4abVPhkMyxV15IOdz7QqREAILK7PilW+s4/sTNWq2r1FxiTF3 9GfrYSEVqeaF8mjVR3SB8gr79MpP96YcV0jzNtcZ7R2ylEoCO8PK+VJxJYtIRSU5nTxvvh Dv2W6tG8PSiQ2G31lgjVtDBnFNmkTBcmIbGr9E7cJ/1xMvkaAeJcltBzhi1oEQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1717000177; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=9Rw/2cnJ+Iso5XuGakDzbFuKdfRtLkLToskmRVbIvD0=; b=VE8oE+W46TJ0618sV/A6MaCiq4c3qaPd5tApxKGvROyTXUFd5PmqpDNPnDukaYDZPQmdwm 2DbYUyP/8Rop+bCQ== To: linux-kernel@vger.kernel.org, netdev@vger.kernel.org Cc: "David S. Miller" , Boqun Feng , Daniel Borkmann , Eric Dumazet , Frederic Weisbecker , Ingo Molnar , Jakub Kicinski , Paolo Abeni , Peter Zijlstra , Thomas Gleixner , Waiman Long , Will Deacon , Sebastian Andrzej Siewior , bpf@vger.kernel.org Subject: [PATCH v3 net-next 11/15] lwt: Don't disable migration prio invoking BPF. Date: Wed, 29 May 2024 18:02:34 +0200 Message-ID: <20240529162927.403425-12-bigeasy@linutronix.de> In-Reply-To: <20240529162927.403425-1-bigeasy@linutronix.de> References: <20240529162927.403425-1-bigeasy@linutronix.de> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org 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@vger.kernel.org Signed-off-by: Sebastian Andrzej Siewior --- 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; }