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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,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 7A9F8C3F2D7 for ; Tue, 3 Mar 2020 17:46:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 561B020870 for ; Tue, 3 Mar 2020 17:46:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583257611; bh=0H7zd2fm3yBoPSOT5TXSvbCR26pgmFzavbvMTKWqxQA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=kHymNSx2tXnePhCrvrwlMUoH9WVoVbV6LSs+rOUy3M5O0i57sG63dK4Pg3NUliyXu zRg59dwqseKcR/IumrBF1dWRoToL6UnMhxqTWQiFuPJ9jaWepIC8ew1YryH/I1K38c Sf2Q7W37c5KOyDFYIaOomCRQ6GWzT2jBwifZgHFE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731244AbgCCRqt (ORCPT ); Tue, 3 Mar 2020 12:46:49 -0500 Received: from mail.kernel.org ([198.145.29.99]:53496 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730225AbgCCRqr (ORCPT ); Tue, 3 Mar 2020 12:46:47 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 7F78420870; Tue, 3 Mar 2020 17:46:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583257607; bh=0H7zd2fm3yBoPSOT5TXSvbCR26pgmFzavbvMTKWqxQA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VBtcChjBnRa52o4TUK1TA0cvxQXnznmSm21U4HMA1HxJnMs9DIomdZE354VX0M+PC 15x+zgMaq3NmYAVk7ChEdeMp6S9AZNn4IQI2sIKWKZxT85CKe+Nznfe3Cnl78Iw1gC CeGjJ4PbFJ7kUvpB2DrEJvCMGn8ahB2zUuRHEWF8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Sameeh Jubran , Arthur Kiyanovski , "David S. Miller" , Sasha Levin Subject: [PATCH 5.5 059/176] net: ena: rss: store hash function as values and not bits Date: Tue, 3 Mar 2020 18:42:03 +0100 Message-Id: <20200303174311.417806638@linuxfoundation.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200303174304.593872177@linuxfoundation.org> References: <20200303174304.593872177@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Arthur Kiyanovski [ Upstream commit 4844470d472d660c26149ad764da2406adb13423 ] The device receives, stores and retrieves the hash function value as bits and not as their enum value. The bug: * In ena_com_set_hash_function() we set cmd.u.flow_hash_func.selected_func to the bit value of rss->hash_func. (1 << rss->hash_func) * In ena_com_get_hash_function() we retrieve the hash function and store it's bit value in rss->hash_func. (Now the bit value of rss->hash_func is stored in rss->hash_func instead of it's enum value) The fix: This commit fixes the issue by converting the retrieved hash function values from the device to the matching enum value of the set bit using ffs(). ffs() finds the first set bit's index in a word. Since the function returns 1 for the LSB's index, we need to subtract 1 from the returned value (note that BIT(0) is 1). Fixes: 1738cd3ed342 ("net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)") Signed-off-by: Sameeh Jubran Signed-off-by: Arthur Kiyanovski Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/ethernet/amazon/ena/ena_com.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/amazon/ena/ena_com.c b/drivers/net/ethernet/amazon/ena/ena_com.c index 6f758ece86f60..8ab192cb26b74 100644 --- a/drivers/net/ethernet/amazon/ena/ena_com.c +++ b/drivers/net/ethernet/amazon/ena/ena_com.c @@ -2370,7 +2370,11 @@ int ena_com_get_hash_function(struct ena_com_dev *ena_dev, if (unlikely(rc)) return rc; - rss->hash_func = get_resp.u.flow_hash_func.selected_func; + /* ffs() returns 1 in case the lsb is set */ + rss->hash_func = ffs(get_resp.u.flow_hash_func.selected_func); + if (rss->hash_func) + rss->hash_func--; + if (func) *func = rss->hash_func; -- 2.20.1