From patchwork Fri Jul 9 12:55:17 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?b?w43DsWlnbyBIdWd1ZXQ=?= X-Patchwork-Id: 472641 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=-11.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS autolearn=ham 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 8D892C07E99 for ; Fri, 9 Jul 2021 12:55:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6A077613BC for ; Fri, 9 Jul 2021 12:55:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231393AbhGIM6Z (ORCPT ); Fri, 9 Jul 2021 08:58:25 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:37205 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229671AbhGIM6Z (ORCPT ); Fri, 9 Jul 2021 08:58:25 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1625835341; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=2LtCtDr7PbYnbqWZk5ph8EJP0nRbCHPsEAr1e6lWVBU=; b=D4RoS7U8V/Kdz6DfNLd6ic5srwUPxl+xxaNs+HquFLvnstpMrz7RWE5qVf9q1o+ejIGC9u +Xsti2CBpcYBfVU4aupAFXFL3zOyppoFIhdNZ6zUmxB/nOzlTm8s9CVTphRnl99xcdIVtV MLaybX+eul9dh2Fs0sSBmIXe+Dc5GuE= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-126-HPGykmieOkG-GUYmVaijgQ-1; Fri, 09 Jul 2021 08:55:40 -0400 X-MC-Unique: HPGykmieOkG-GUYmVaijgQ-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id A556B100C660; Fri, 9 Jul 2021 12:55:38 +0000 (UTC) Received: from localhost.localdomain (ovpn-113-77.ams2.redhat.com [10.36.113.77]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4EAF9797C0; Fri, 9 Jul 2021 12:55:33 +0000 (UTC) From: =?utf-8?b?w43DsWlnbyBIdWd1ZXQ=?= To: ecree.xilinx@gmail.com, habetsm.xilinx@gmail.com, davem@davemloft.net, kuba@kernel.org, ivan@cloudflare.com Cc: ast@kernel.org, daniel@iogearbox.net, hawk@kernel.org, john.fastabend@gmail.com, netdev@vger.kernel.org, ihuguet@redhat.com Subject: [PATCH v2 0/3] Fix lack of XDP TX queues Date: Fri, 9 Jul 2021 14:55:17 +0200 Message-Id: <20210709125520.39001-1-ihuguet@redhat.com> In-Reply-To: <20210707081642.95365-1-ihuguet@redhat.com> References: <20210707081642.95365-1-ihuguet@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org A change introduced in commit e26ca4b53582 ("sfc: reduce the number of requested xdp ev queues") created a bug in XDP_TX and XDP_REDIRECT because it unintentionally reduced the number of XDP TX queues, letting not enough queues to have one per CPU, which leaded to errors if XDP TX/REDIRECT was done from a high numbered CPU. This patchs make the following changes: - Fix the bug mentioned above - Revert commit 99ba0ea616aa ("sfc: adjust efx->xdp_tx_queue_count with the real number of initialized queues") which intended to fix a related problem, created by mentioned bug, but it's no longer necesary - Add a new error log message if there are not enough resources to make XDP_TX/REDIRECT work V1 -> V2: keep the calculation of how many tx queues can handle a single event queue, but apply the "max. tx queues per channel" upper limit. Íñigo Huguet (3): sfc: fix lack of XDP TX queues - error XDP TX failed (-22) sfc: revert "adjust efx->xdp_tx_queue_count with the real number of initialized queues" sfc: add logs explaining XDP_TX/REDIRECT is not available drivers/net/ethernet/sfc/efx_channels.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)