From nobody Fri Apr 3 02:58:19 2026 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4F8D3295DBD for ; Wed, 25 Mar 2026 04:50:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774414226; cv=none; b=c1jWCMkAMR0BEoybnDsW7SfytM0xbk+oLq6uqQ1kHmW1P0OPRIiWHU3mQgZsgn+XjnBrSFfaNhKLGd+JdF4PNm6QD6HMzT99Y7OM7Dgw5Q6A8eooLGw4TzoXgNhKz8NVpVTIqZG9FaFvqQq5KK0kxiv/PCkOcZIk/reAf9rX74k= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774414226; c=relaxed/simple; bh=NOnb5W0LQimumxs5VACbGVyOcdX2vuC/C5pyx+AnOMU=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=XIuxSJK3p1UtosR5/6m/cTJjM3QgYXdfYMWQZWrpBi6Ks+MjxkXEpdqkwJ9f0WxoqcUVq2IapMuzhzZL51y1iptxIXYHs+lOg4oXAsrmlO1PfKFlKusY/5A+60Q2WY02kQ4+NRi5zmyZtUe3F/a1VXz1gkxT3rzAZWTGPgI2/fI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=Z9erd6V5; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Z9erd6V5" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1774414224; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=pJnh0qeblB7QuhQfb4FwZ71GL5PXvoes3ViBRQuiUG0=; b=Z9erd6V5YVGadkhfuwwtx5RkFotzZihTBVkXGSzzApSqPPdkLXxpmHhC4cPOCRACIU6pz6 pfgW3JtVxcdGJ8o7FN35YOEtclM0pkNOqEj46MS/lNYfAA99ohIAcg9xfjVjhYHUvH64Xe uDP6ORQtE2CkhQROcwBwYw8AKpQwLi0= Received: from mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-597-xM6s-7JXM86MTFsko1JMMA-1; Wed, 25 Mar 2026 00:50:18 -0400 X-MC-Unique: xM6s-7JXM86MTFsko1JMMA-1 X-Mimecast-MFC-AGG-ID: xM6s-7JXM86MTFsko1JMMA_1774414216 Received: from mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.111]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 8BA80195608B; Wed, 25 Mar 2026 04:50:16 +0000 (UTC) Received: from localhost.redhat.com (unknown [10.72.112.30]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 51C301800361; Wed, 25 Mar 2026 04:50:09 +0000 (UTC) From: Li Tian To: netdev@vger.kernel.org, linux-hyperv@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Haiyang Zhang , Wei Liu , Dexuan Cui , Long Li , Andrew Lunn , Eric Dumazet , Vitaly Kuznetsov , Paolo Abeni , Jakub Kicinski , Jason Wang , Li Tian Subject: [PATCH net] netvsc: transfer lower device max tso size during VF transition Date: Wed, 25 Mar 2026 12:50:06 +0800 Message-ID: <20260325045006.18607-1-litian@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 Content-Type: text/plain; charset="utf-8" When netvsc is accelerated by the lower device, we can advertise the lower device max tso size in order to get better performance. While a long-term migration to user-space bonding is planned, current users on RHEL 10 / Azure are experiencing significant performance regressions in 802.3ad environments. This patch provides a localized, safe fix within netvsc without introducing new core networking helpers. Signed-off-by: Li Tian --- drivers/net/hyperv/netvsc_drv.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_dr= v.c index ee5ab5ceb2be..971607c7406f 100644 --- a/drivers/net/hyperv/netvsc_drv.c +++ b/drivers/net/hyperv/netvsc_drv.c @@ -2428,10 +2428,14 @@ static int netvsc_vf_changed(struct net_device *vf_= netdev, unsigned long event) * This value is only increased for netvsc NIC when datapath is * switched over to the VF */ - if (vf_is_up) + if (vf_is_up) { netif_set_tso_max_size(ndev, vf_netdev->tso_max_size); - else + WRITE_ONCE(ndev->gso_max_size, READ_ONCE(vf_netdev->gso_max_size)); + WRITE_ONCE(ndev->gso_ipv4_max_size, + READ_ONCE(vf_netdev->gso_ipv4_max_size)); + } else { netif_set_tso_max_size(ndev, netvsc_dev->netvsc_gso_max_size); + } } =20 return NOTIFY_OK; --=20 2.53.0