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 Received: from smtp3.osuosl.org (smtp3.osuosl.org [140.211.166.136]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 4E8BBC00140 for ; Mon, 15 Aug 2022 09:17:08 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp3.osuosl.org (Postfix) with ESMTP id A3E1860F1B; Mon, 15 Aug 2022 09:17:07 +0000 (UTC) DKIM-Filter: OpenDKIM Filter v2.11.0 smtp3.osuosl.org A3E1860F1B Authentication-Results: smtp3.osuosl.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=KoqsX+Hx X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp3.osuosl.org ([127.0.0.1]) by localhost (smtp3.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 01r_4wJjfGaG; Mon, 15 Aug 2022 09:17:05 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by smtp3.osuosl.org (Postfix) with ESMTPS id C128360BC2; Mon, 15 Aug 2022 09:17:04 +0000 (UTC) DKIM-Filter: OpenDKIM Filter v2.11.0 smtp3.osuosl.org C128360BC2 Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 84984C0033; Mon, 15 Aug 2022 09:17:04 +0000 (UTC) Received: from smtp2.osuosl.org (smtp2.osuosl.org [140.211.166.133]) by lists.linuxfoundation.org (Postfix) with ESMTP id F289DC002D for ; Mon, 15 Aug 2022 09:17:03 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp2.osuosl.org (Postfix) with ESMTP id B8143408D0 for ; Mon, 15 Aug 2022 09:17:03 +0000 (UTC) DKIM-Filter: OpenDKIM Filter v2.11.0 smtp2.osuosl.org B8143408D0 Authentication-Results: smtp2.osuosl.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=KoqsX+Hx X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp2.osuosl.org ([127.0.0.1]) by localhost (smtp2.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id IZe_MwN8HwEr for ; Mon, 15 Aug 2022 09:17:02 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.8.0 DKIM-Filter: OpenDKIM Filter v2.11.0 smtp2.osuosl.org 9927740146 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by smtp2.osuosl.org (Postfix) with ESMTPS id 9927740146 for ; Mon, 15 Aug 2022 09:17:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1660555021; 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; bh=+lgH1hBRD1m/mzbQi1aYCWsf/2qMXaicGixcF+IMRPc=; b=KoqsX+Hx+/OsLZ98dyu6MVmoAOlultSiJ4MUjiRfyTYH/0js45wKLxEbKEVFfCt1/c8ceC 8LfmCU1ox/jZJecq0Dggx7MLQMRBxDpHEe0PF0yX2LzX8dL8BHlzPgjmjtDsc8WCP5nVgM YOtUQq/+nlDgFVJpkKUQvqU8v6A+7Cc= Received: from mail-ej1-f71.google.com (mail-ej1-f71.google.com [209.85.218.71]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_128_GCM_SHA256) id us-mta-558-yf0fwPiYPASBDS56aHHHzA-1; Mon, 15 Aug 2022 05:16:58 -0400 X-MC-Unique: yf0fwPiYPASBDS56aHHHzA-1 Received: by mail-ej1-f71.google.com with SMTP id oz39-20020a1709077da700b007313bf43f0dso971292ejc.0 for ; Mon, 15 Aug 2022 02:16:57 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-disposition:mime-version:message-id:subject:cc:to:from:date :x-gm-message-state:from:to:cc; bh=+lgH1hBRD1m/mzbQi1aYCWsf/2qMXaicGixcF+IMRPc=; b=ov5q/jY9sA2FcMDtZ8LYyJcIF5E72qbSbZk01lenng1GTLqfI8rGqeMTKulQVwPIg4 0s1USLWqC2GPNIoYBIcCRNGocoDnEcM20Ql6SLf7TXOw09MPcj8Xd17wo9CNysg9rwJP Fzn+ZaEdfsLfEQU/LRbIu2ti+zJVsP82Vi9/8ejxMidK8uLli/Kqv+oqSow6VhLOipV4 dCWRbjsoaUGLv1XfF5PVOFxZLf29bhd13YBBi2HDSlagf7NUlv3g3F/W6ycKWA5r+PmU 7jpQ1pAdLNInHDsYpYLgaCW9IKjizIn745cwAHuuuyshJk+ZN4FSmkU1XQxW8V2g8Cvs G7aQ== X-Gm-Message-State: ACgBeo0TdxCKeoy69nzibYXaNuJsKoLqbSL3GhDjksUYAQKDBDDRys18 CL0Aq67ezC0abQJEBiQId3TrwU/HBZbGoZsqpL06lpwYLXpwe7B3whHS2VynYdJzFadqkt1lf91 niGquhOGl2kJ0U99elgh64pASHPSBhvxygJn5a1ubxg== X-Received: by 2002:a05:6402:1e8d:b0:441:58db:b6a2 with SMTP id f13-20020a0564021e8d00b0044158dbb6a2mr13472962edf.277.1660555017049; Mon, 15 Aug 2022 02:16:57 -0700 (PDT) X-Google-Smtp-Source: AA6agR4TUuxXLf4X9ZxvGDLmurzNR+B1PhAkCo7uKtZy520YFWqKHF1q3eDJtrRUZuNuy6tNLwZeog== X-Received: by 2002:a05:6402:1e8d:b0:441:58db:b6a2 with SMTP id f13-20020a0564021e8d00b0044158dbb6a2mr13472939edf.277.1660555016769; Mon, 15 Aug 2022 02:16:56 -0700 (PDT) Received: from redhat.com ([2.54.169.49]) by smtp.gmail.com with ESMTPSA id i20-20020a17090685d400b00722e50dab2csm3817610ejy.109.2022.08.15.02.16.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 15 Aug 2022 02:16:56 -0700 (PDT) Date: Mon, 15 Aug 2022 05:16:50 -0400 From: "Michael S. Tsirkin" To: linux-kernel@vger.kernel.org Subject: [PATCH] virtio_net: Revert "virtio_net: set the default max ring size by find_vqs()" Message-ID: <20220815090521.127607-1-mst@redhat.com> MIME-Version: 1.0 X-Mailer: git-send-email 2.27.0.106.g8ac3dc51b1 X-Mutt-Fcc: =sent X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Disposition: inline Cc: Jens Axboe , "Martin K. Petersen" , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, James Bottomley , Linus Torvalds , Eric Dumazet , Greg KH , c@redhat.com, Jakub Kicinski , Paolo Abeni , Andres Freund , "David S. Miller" , Guenter Roeck X-BeenThere: virtualization@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux virtualization List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" This reverts commit 762faee5a2678559d3dc09d95f8f2c54cd0466a7. This has been reported to trip up guests on GCP (Google Cloud). Why is not yet clear - to be debugged, but the patch itself has several other issues: - It treats unknown speed as < 10G - It leaves userspace no way to find out the ring size set by hypervisor - It tests speed when link is down - It ignores the virtio spec advice: Both \field{speed} and \field{duplex} can change, thus the driver is expected to re-read these values after receiving a configuration change notification. - It is not clear the performance impact has been tested properly Revert the patch for now. Link: https://lore.kernel.org/r/20220814212610.GA3690074%40roeck-us.net Link: https://lore.kernel.org/r/20220815070203.plwjx7b3cyugpdt7%40awork3.anarazel.de Link: https://lore.kernel.org/r/3df6bb82-1951-455d-a768-e9e1513eb667%40www.fastmail.com Link: https://lore.kernel.org/r/FCDC5DDE-3CDD-4B8A-916F-CA7D87B547CE%40anarazel.de Fixes: 762faee5a267 ("virtio_net: set the default max ring size by find_vqs()") Cc: Xuan Zhuo Cc: Jason Wang Signed-off-by: Michael S. Tsirkin Tested-by: Andres Freund --- drivers/net/virtio_net.c | 42 ++++------------------------------------ 1 file changed, 4 insertions(+), 38 deletions(-) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index d934774e9733..ece00b84e3a7 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -3432,29 +3432,6 @@ static unsigned int mergeable_min_buf_len(struct virtnet_info *vi, struct virtqu (unsigned int)GOOD_PACKET_LEN); } -static void virtnet_config_sizes(struct virtnet_info *vi, u32 *sizes) -{ - u32 i, rx_size, tx_size; - - if (vi->speed == SPEED_UNKNOWN || vi->speed < SPEED_10000) { - rx_size = 1024; - tx_size = 1024; - - } else if (vi->speed < SPEED_40000) { - rx_size = 1024 * 4; - tx_size = 1024 * 4; - - } else { - rx_size = 1024 * 8; - tx_size = 1024 * 8; - } - - for (i = 0; i < vi->max_queue_pairs; i++) { - sizes[rxq2vq(i)] = rx_size; - sizes[txq2vq(i)] = tx_size; - } -} - static int virtnet_find_vqs(struct virtnet_info *vi) { vq_callback_t **callbacks; @@ -3462,7 +3439,6 @@ static int virtnet_find_vqs(struct virtnet_info *vi) int ret = -ENOMEM; int i, total_vqs; const char **names; - u32 *sizes; bool *ctx; /* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by @@ -3490,15 +3466,10 @@ static int virtnet_find_vqs(struct virtnet_info *vi) ctx = NULL; } - sizes = kmalloc_array(total_vqs, sizeof(*sizes), GFP_KERNEL); - if (!sizes) - goto err_sizes; - /* Parameters for control virtqueue, if any */ if (vi->has_cvq) { callbacks[total_vqs - 1] = NULL; names[total_vqs - 1] = "control"; - sizes[total_vqs - 1] = 64; } /* Allocate/initialize parameters for send/receive virtqueues */ @@ -3513,10 +3484,8 @@ static int virtnet_find_vqs(struct virtnet_info *vi) ctx[rxq2vq(i)] = true; } - virtnet_config_sizes(vi, sizes); - - ret = virtio_find_vqs_ctx_size(vi->vdev, total_vqs, vqs, callbacks, - names, sizes, ctx, NULL); + ret = virtio_find_vqs_ctx(vi->vdev, total_vqs, vqs, callbacks, + names, ctx, NULL); if (ret) goto err_find; @@ -3536,8 +3505,6 @@ static int virtnet_find_vqs(struct virtnet_info *vi) err_find: - kfree(sizes); -err_sizes: kfree(ctx); err_ctx: kfree(names); @@ -3897,9 +3864,6 @@ static int virtnet_probe(struct virtio_device *vdev) vi->curr_queue_pairs = num_online_cpus(); vi->max_queue_pairs = max_queue_pairs; - virtnet_init_settings(dev); - virtnet_update_settings(vi); - /* Allocate/initialize the rx/tx queues, and invoke find_vqs */ err = init_vqs(vi); if (err) @@ -3912,6 +3876,8 @@ static int virtnet_probe(struct virtio_device *vdev) netif_set_real_num_tx_queues(dev, vi->curr_queue_pairs); netif_set_real_num_rx_queues(dev, vi->curr_queue_pairs); + virtnet_init_settings(dev); + if (virtio_has_feature(vdev, VIRTIO_NET_F_STANDBY)) { vi->failover = net_failover_create(vi->dev); if (IS_ERR(vi->failover)) { -- MST _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization