From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-yb1-f202.google.com (mail-yb1-f202.google.com [209.85.219.202]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 973035A78E for ; Thu, 28 Mar 2024 17:03:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.219.202 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711645398; cv=none; b=cCGdZsbAvajmSOL1T++vWkp30kzykgolV/uw0RKCHkbZxFzyJmmUXldn0hcr7EEUWQqJ4GcgPh2niZt74ue6X9XRO2H6RhZ//6HBgYsVffDt4eU2FxrQ+QMZNAVbSzqiM9ybm265aNwrvKrJ1sl3oSij7iPCYFq20GKDnfeOVc4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711645398; c=relaxed/simple; bh=F4gefdTj70muIJN2Zn7X1B8TXmBV5hqnEjBHGBIqff8=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=n0Oed3D1A8lc6/AN1ZEtoB6IXSGJA0URnDG7+XjFnJY9OVVwG0RhhI9jfJnaChASFD51CKlLEyVjjKevZaCps6AFAPwbpkEesYjxzFaUkWRebbVHJvZSRleditXcsAo9t6sfnRX5Unbg0GQ2X0aPQBnhblGQuSEV3JzOlfCETC8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--edumazet.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=bvbTVzn5; arc=none smtp.client-ip=209.85.219.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--edumazet.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="bvbTVzn5" Received: by mail-yb1-f202.google.com with SMTP id 3f1490d57ef6-dd169dd4183so1379617276.3 for ; Thu, 28 Mar 2024 10:03:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1711645395; x=1712250195; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=FtfH02Ug/jt3Vtvx2bBwAZ1F+VYum2JtqqevVN5MyMc=; b=bvbTVzn5lpS1821HnOAn8qLAoFXvXlx0n0Qu8qASV7ZL1Bvw5HBjK71tioP15LJZce 0S+XjG+7xUOZgGmRxU3cKcFC46mQ3nKsX86ZfOi6j0eRk1pnZUBUFofAoizF7up8gIPT wIIjCgsVLWd0VYw89VxBZVAvYX71i1O1KDP3iM0Vdj5xiAvRXv2ObLimhNOPnXBD6pTC oFoJcSuKPVY4XUk86DN+U5URs4bw7daokt9oc6N6wUhF6R08syVP8g7h/napKFlFPcOa AUlKadmhNVdvba60tXeldB07MdI+349TJjkaxxS9pv4q6rotkhBxl/p6W/1oqf/2Dhuc EO/w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1711645395; x=1712250195; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=FtfH02Ug/jt3Vtvx2bBwAZ1F+VYum2JtqqevVN5MyMc=; b=ulkyzdidUBug2wxr1AcVsmurfTc+alzYjayUWBvqw/kUf6MotOSWLHU5zClidRmkS9 C7R79oDFVkFC0iksftBwLRJ9mcDupRYs80ft5kBObFHe/h4nyajxRC3kbacttue0rDXs 83DUUHObkA23B3aUztNtZJt8QHt5LKBu9TLpnlcRyFipF2sfBnoNJ92vJ1zL5Tjy4llN Z9zftTtOpm7zw7PkvTGdIUqH5k/wYHMFzz/jlBSM+/cCWGUj6kFepdVPSKRFI8j8RAzO QWWwAeOf1XjNregjU9kZJIJoBibe7VlPtwZrANMx5THq1V0I+iEeqmMbZtGlxvDz5nHJ LCyg== X-Gm-Message-State: AOJu0Yy9qImlIvnZGuJAdeVMzk6O9h+DvJ573ZggSxKrYkqeZj6QrocX oH+Grjn4qHp60MjccEsXqG1NFNhRPMIwlHf9qFC+DohQHHCUukCX6nHbAr0SAp5344ZFb1CVYhT woE/nFCo9+Q== X-Google-Smtp-Source: AGHT+IH+8zFiZOYmBZcmX4Q9j60Xdg9XImP4FW/41zvE6T/HOTeWE3/uBt0aUrcda2YyGzUocDfaX0OEueuBlQ== X-Received: from edumazet1.c.googlers.com ([fda3:e722:ac3:cc00:2b:7d90:c0a8:395a]) (user=edumazet job=sendgmr) by 2002:a05:6902:1502:b0:dda:c565:1025 with SMTP id q2-20020a056902150200b00ddac5651025mr252047ybu.2.1711645395779; Thu, 28 Mar 2024 10:03:15 -0700 (PDT) Date: Thu, 28 Mar 2024 17:03:04 +0000 In-Reply-To: <20240328170309.2172584-1-edumazet@google.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240328170309.2172584-1-edumazet@google.com> X-Mailer: git-send-email 2.44.0.478.gd926399ef9-goog Message-ID: <20240328170309.2172584-4-edumazet@google.com> Subject: [PATCH net-next 3/8] net: enqueue_to_backlog() change vs not running device From: Eric Dumazet To: "David S . Miller" , Jakub Kicinski , Paolo Abeni Cc: netdev@vger.kernel.org, eric.dumazet@gmail.com, Eric Dumazet Content-Type: text/plain; charset="UTF-8" If the device attached to the packet given to enqueue_to_backlog() is not running, we drop the packet. But we accidentally increase sd->dropped, giving false signals to admins: sd->dropped should be reserved to cpu backlog pressure, not to temporary glitches at device dismantles. While we are at it, perform the netif_running() test before we get the rps lock, and use REASON_DEV_READY drop reason instead of NOT_SPECIFIED. Signed-off-by: Eric Dumazet --- net/core/dev.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/net/core/dev.c b/net/core/dev.c index 5d36a634f468ffdeaca598c3dd033fe06d240bd0..af7a34b0a7d6683c6ffb21dd3388ed678473d95e 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -4791,12 +4791,13 @@ static int enqueue_to_backlog(struct sk_buff *skb, int cpu, unsigned long flags; unsigned int qlen; - reason = SKB_DROP_REASON_NOT_SPECIFIED; + reason = SKB_DROP_REASON_DEV_READY; + if (!netif_running(skb->dev)) + goto bad_dev; + sd = &per_cpu(softnet_data, cpu); backlog_lock_irq_save(sd, &flags); - if (!netif_running(skb->dev)) - goto drop; qlen = skb_queue_len(&sd->input_pkt_queue); if (qlen <= READ_ONCE(net_hotdata.max_backlog) && !skb_flow_limit(skb, qlen)) { @@ -4817,10 +4818,10 @@ static int enqueue_to_backlog(struct sk_buff *skb, int cpu, } reason = SKB_DROP_REASON_CPU_BACKLOG; -drop: sd->dropped++; backlog_unlock_irq_restore(sd, &flags); +bad_dev: dev_core_stats_rx_dropped_inc(skb->dev); kfree_skb_reason(skb, reason); return NET_RX_DROP; -- 2.44.0.478.gd926399ef9-goog