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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 64E41C433FE for ; Sun, 16 Oct 2022 07:12:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229729AbiJPHMm (ORCPT ); Sun, 16 Oct 2022 03:12:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55756 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229481AbiJPHMl (ORCPT ); Sun, 16 Oct 2022 03:12:41 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D0BC83DF04 for ; Sun, 16 Oct 2022 00:12:40 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 6D6FD60AB2 for ; Sun, 16 Oct 2022 07:12:40 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7B754C433B5; Sun, 16 Oct 2022 07:12:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1665904359; bh=EjrXxVUPp/srpQHohQRUrSlsv1ZUrIEnvMUzFJXFckQ=; h=Subject:To:Cc:From:Date:From; b=sT+UirOJu0Nxf/H0Grwlsr9D86IRWeDtm29LJaCAKLTogKC2iNcryzxF9VABmQuIF D0Y20Npo5Yqr6RiqcIoz8Bxk/1J+dYLkEbj7RDFBcQMYIZ6jP39BJyI1AhMDrEWTIK 6LpZaJxWuugVDonpKcFqlkM+HBTaHEqoPzcYvI5I= Subject: FAILED: patch "[PATCH] hv_netvsc: Fix race between VF offering and VF association" failed to apply to 5.10-stable tree To: gauravkohli@linux.microsoft.com, davem@davemloft.net, haiyangz@microsoft.com Cc: From: Date: Sun, 16 Oct 2022 09:13:26 +0200 Message-ID: <16659044069194@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org The patch below does not apply to the 5.10-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . Possible dependencies: 365e1ececb29 ("hv_netvsc: Fix race between VF offering and VF association message from host") d0922bf79817 ("hv_netvsc: Add error handling while switching data path") 34b06a2eee44 ("hv_netvsc: Process NETDEV_GOING_DOWN on VF hot remove") 8b31f8c982b7 ("hv_netvsc: Wait for completion on request SWITCH_DATA_PATH") 4d18fcc95f50 ("hv_netvsc: Use vmbus_requestor to generate transaction IDs for VMBus hardening") e8b7db38449a ("Drivers: hv: vmbus: Add vmbus_requestor data structure for VMBus hardening") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 365e1ececb2905f94cc10a5817c5b644a32a3ae2 Mon Sep 17 00:00:00 2001 From: Gaurav Kohli Date: Wed, 5 Oct 2022 22:52:59 -0700 Subject: [PATCH] hv_netvsc: Fix race between VF offering and VF association message from host During vm boot, there might be possibility that vf registration call comes before the vf association from host to vm. And this might break netvsc vf path, To prevent the same block vf registration until vf bind message comes from host. Cc: stable@vger.kernel.org Fixes: 00d7ddba11436 ("hv_netvsc: pair VF based on serial number") Reviewed-by: Haiyang Zhang Signed-off-by: Gaurav Kohli Signed-off-by: David S. Miller diff --git a/drivers/net/hyperv/hyperv_net.h b/drivers/net/hyperv/hyperv_net.h index 25b38a374e3c..dd5919ec408b 100644 --- a/drivers/net/hyperv/hyperv_net.h +++ b/drivers/net/hyperv/hyperv_net.h @@ -1051,7 +1051,8 @@ struct net_device_context { u32 vf_alloc; /* Serial number of the VF to team with */ u32 vf_serial; - + /* completion variable to confirm vf association */ + struct completion vf_add; /* Is the current data path through the VF NIC? */ bool data_path_is_vf; diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c index f066de0da492..9352dad58996 100644 --- a/drivers/net/hyperv/netvsc.c +++ b/drivers/net/hyperv/netvsc.c @@ -1580,6 +1580,10 @@ static void netvsc_send_vf(struct net_device *ndev, net_device_ctx->vf_alloc = nvmsg->msg.v4_msg.vf_assoc.allocated; net_device_ctx->vf_serial = nvmsg->msg.v4_msg.vf_assoc.serial; + + if (net_device_ctx->vf_alloc) + complete(&net_device_ctx->vf_add); + netdev_info(ndev, "VF slot %u %s\n", net_device_ctx->vf_serial, net_device_ctx->vf_alloc ? "added" : "removed"); diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c index 5f08482065ca..89eb4f179a3c 100644 --- a/drivers/net/hyperv/netvsc_drv.c +++ b/drivers/net/hyperv/netvsc_drv.c @@ -2313,6 +2313,18 @@ static struct net_device *get_netvsc_byslot(const struct net_device *vf_netdev) } + /* Fallback path to check synthetic vf with + * help of mac addr + */ + list_for_each_entry(ndev_ctx, &netvsc_dev_list, list) { + ndev = hv_get_drvdata(ndev_ctx->device_ctx); + if (ether_addr_equal(vf_netdev->perm_addr, ndev->perm_addr)) { + netdev_notice(vf_netdev, + "falling back to mac addr based matching\n"); + return ndev; + } + } + netdev_notice(vf_netdev, "no netdev found for vf serial:%u\n", serial); return NULL; @@ -2409,6 +2421,11 @@ static int netvsc_vf_changed(struct net_device *vf_netdev, unsigned long event) if (net_device_ctx->data_path_is_vf == vf_is_up) return NOTIFY_OK; + if (vf_is_up && !net_device_ctx->vf_alloc) { + netdev_info(ndev, "Waiting for the VF association from host\n"); + wait_for_completion(&net_device_ctx->vf_add); + } + ret = netvsc_switch_datapath(ndev, vf_is_up); if (ret) { @@ -2440,6 +2457,7 @@ static int netvsc_unregister_vf(struct net_device *vf_netdev) netvsc_vf_setxdp(vf_netdev, NULL); + reinit_completion(&net_device_ctx->vf_add); netdev_rx_handler_unregister(vf_netdev); netdev_upper_dev_unlink(vf_netdev, ndev); RCU_INIT_POINTER(net_device_ctx->vf_netdev, NULL); @@ -2479,6 +2497,7 @@ static int netvsc_probe(struct hv_device *dev, INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_link_change); + init_completion(&net_device_ctx->vf_add); spin_lock_init(&net_device_ctx->lock); INIT_LIST_HEAD(&net_device_ctx->reconfig_events); INIT_DELAYED_WORK(&net_device_ctx->vf_takeover, netvsc_vf_setup);