From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E81D5C282C8 for ; Mon, 28 Jan 2019 17:48:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B41252175B for ; Mon, 28 Jan 2019 17:48:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1548697727; bh=VO1xttr0KEnwEWECtrZweLaQqLab3ASJdmHCmU4mRmk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Dgfh/Qbr6iojF5wAxJC3W42xCrmGpF0fKxN2WHLQpkoMjdWCu19m/5ogdzKtTGTMt XtLfTv1wD7CpcpkUHSQ+pzCa+9xld2RU0k7SV7j1dkpWS6bSbbJaz88rsxWaw5Y6Ce RgUBZbKvd1UFp+pJ9nn7cg4/8m50zE/83FPaBXU8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727770AbfA1Pp1 (ORCPT ); Mon, 28 Jan 2019 10:45:27 -0500 Received: from mail.kernel.org ([198.145.29.99]:58690 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726920AbfA1PpU (ORCPT ); Mon, 28 Jan 2019 10:45:20 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 682322147A; Mon, 28 Jan 2019 15:45:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1548690319; bh=VO1xttr0KEnwEWECtrZweLaQqLab3ASJdmHCmU4mRmk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=joqJabaCJCGFMVKqq/Vy+ogClHSKGXpYFdHxaGLzxPn271uXYu+7uSssqs0vPHK+C Luc2A738kFJOOtxi/Um8vjP1+rBMDPxu0Cg62+n07M7M/pgdN2K9v0EVL2Kq4VaWKz VhKUfiq/5hQFKx3lQzc+4w0npMKNTAlq7vcmbsWs= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Alan Brady , Jeff Kirsher , Sasha Levin , netdev@vger.kernel.org Subject: [PATCH AUTOSEL 4.20 049/304] i40e: prevent overlapping tx_timeout recover Date: Mon, 28 Jan 2019 10:39:26 -0500 Message-Id: <20190128154341.47195-49-sashal@kernel.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190128154341.47195-1-sashal@kernel.org> References: <20190128154341.47195-1-sashal@kernel.org> MIME-Version: 1.0 X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Alan Brady [ Upstream commit d5585b7b6846a6d0f9517afe57be3843150719da ] If a TX hang occurs, we attempt to recover by incrementally resetting. If we're starved for CPU time, it's possible the reset doesn't actually complete (or even fire) before another tx_timeout fires causing us to fly through the different resets without actually doing them. This adds a bit to set and check if a timeout recovery is already pending and, if so, bail out of tx_timeout. The bit will get cleared at the end of i40e_rebuild when reset is complete. Signed-off-by: Alan Brady Tested-by: Andrew Bowers Signed-off-by: Jeff Kirsher Signed-off-by: Sasha Levin --- drivers/net/ethernet/intel/i40e/i40e.h | 1 + drivers/net/ethernet/intel/i40e/i40e_main.c | 5 +++++ 2 files changed, 6 insertions(+) diff --git a/drivers/net/ethernet/intel/i40e/i40e.h b/drivers/net/ethernet/intel/i40e/i40e.h index 876cac317e79..8245ff12fd64 100644 --- a/drivers/net/ethernet/intel/i40e/i40e.h +++ b/drivers/net/ethernet/intel/i40e/i40e.h @@ -122,6 +122,7 @@ enum i40e_state_t { __I40E_MDD_EVENT_PENDING, __I40E_VFLR_EVENT_PENDING, __I40E_RESET_RECOVERY_PENDING, + __I40E_TIMEOUT_RECOVERY_PENDING, __I40E_MISC_IRQ_REQUESTED, __I40E_RESET_INTR_RECEIVED, __I40E_REINIT_REQUESTED, diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c index 0e5dc74b4ef2..419cf3faada6 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_main.c +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c @@ -338,6 +338,10 @@ static void i40e_tx_timeout(struct net_device *netdev) (pf->tx_timeout_last_recovery + netdev->watchdog_timeo))) return; /* don't do any new action before the next timeout */ + /* don't kick off another recovery if one is already pending */ + if (test_and_set_bit(__I40E_TIMEOUT_RECOVERY_PENDING, pf->state)) + return; + if (tx_ring) { head = i40e_get_head(tx_ring); /* Read interrupt register */ @@ -9632,6 +9636,7 @@ end_core_reset: clear_bit(__I40E_RESET_FAILED, pf->state); clear_recovery: clear_bit(__I40E_RESET_RECOVERY_PENDING, pf->state); + clear_bit(__I40E_TIMEOUT_RECOVERY_PENDING, pf->state); } /** -- 2.19.1