From patchwork Fri Oct 2 18:06:41 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Saeed Mahameed X-Patchwork-Id: 1376013 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=kernel.org Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=default header.b=wamQAP6q; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4C2yd25nfxz9sPB for ; Sat, 3 Oct 2020 04:07:18 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388401AbgJBSHJ (ORCPT ); Fri, 2 Oct 2020 14:07:09 -0400 Received: from mail.kernel.org ([198.145.29.99]:36646 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726813AbgJBSHG (ORCPT ); Fri, 2 Oct 2020 14:07:06 -0400 Received: from sx1.mtl.com (c-24-6-56-119.hsd1.ca.comcast.net [24.6.56.119]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C470C208B6; Fri, 2 Oct 2020 18:07:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1601662026; bh=U8P41oSAqhaQ7HCq8VzIHFjjhCogaVVfm4fsuFKd1Gg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=wamQAP6qFZ/ywFxwDe/NztDvDFn90DsdsZgtV2nH1WxtTqm8cSbXrR1m5T7zildZV SoXKDK8KDQf9Uz3MGCy7SWLO/RJfoMldnFiRvQEahr8lJ5ntA9s0EHejwwwfDUA7sK DgHxUvAeUZlWeeVPLXwUwQV3y5mfcPOY/DplzJi8= From: saeed@kernel.org To: "David S. Miller" , Jakub Kicinski Cc: netdev@vger.kernel.org, Eran Ben Elisha , Moshe Shemesh , Saeed Mahameed Subject: [net V3 01/14] net/mlx5: Fix a race when moving command interface to polling mode Date: Fri, 2 Oct 2020 11:06:41 -0700 Message-Id: <20201002180654.262800-2-saeed@kernel.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201002180654.262800-1-saeed@kernel.org> References: <20201002180654.262800-1-saeed@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Eran Ben Elisha As part of driver unload, it destroys the commands EQ (via FW command). As the commands EQ is destroyed, FW will not generate EQEs for any command that driver sends afterwards. Driver should poll for later commands status. Driver commands mode metadata is updated before the commands EQ is actually destroyed. This can lead for double completion handle by the driver (polling and interrupt), if a command is executed and completed by FW after the mode was changed, but before the EQ was destroyed. Fix that by using the mlx5_cmd_allowed_opcode mechanism to guarantee that only DESTROY_EQ command can be executed during this time period. Fixes: e126ba97dba9 ("mlx5: Add driver for Mellanox Connect-IB adapters") Signed-off-by: Eran Ben Elisha Reviewed-by: Moshe Shemesh Signed-off-by: Saeed Mahameed --- drivers/net/ethernet/mellanox/mlx5/core/eq.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eq.c b/drivers/net/ethernet/mellanox/mlx5/core/eq.c index 31ef9f8420c8..1318d774b18f 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/eq.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/eq.c @@ -656,8 +656,10 @@ static void destroy_async_eqs(struct mlx5_core_dev *dev) cleanup_async_eq(dev, &table->pages_eq, "pages"); cleanup_async_eq(dev, &table->async_eq, "async"); + mlx5_cmd_allowed_opcode(dev, MLX5_CMD_OP_DESTROY_EQ); mlx5_cmd_use_polling(dev); cleanup_async_eq(dev, &table->cmd_eq, "cmd"); + mlx5_cmd_allowed_opcode(dev, CMD_ALLOWED_OPCODE_ALL); mlx5_eq_notifier_unregister(dev, &table->cq_err_nb); }