From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 286F91F91E3 for ; Thu, 28 May 2026 10:01:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779962467; cv=none; b=dY893sKKB0vskBGHGWjEgbTODN83rhDCrXjgR4UJGCru7AWnMunN0rVCtF2oa2Qp49APCzH70IanxP8G43M+IFmvUDq2c7q8TyODxYy5+nPZDv65h5dDSMAzf5ImRcdEuJhYb1oDlOyaAefWUsmCRVP6qHdfeoxbS6ovytRNbII= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779962467; c=relaxed/simple; bh=Wlhjgw9Sg0vGmivkMlVKD3X6qhVMXw2XBR93pMYGY1k=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=TgwqkzkOfLMtM0mnFg2zBtnx/XtORBfrOy6vyh2ZrZmR8wAbGJ/spiMzo0GbygtoqPUmlYb09WF12WMVFp3L212porG4ndIlaDs9dqJM64P+Qc5a1tCa/DDYJ45y+CrFeRAVvIsBfPhTsc4cvQsmoiWIe3XvsQLzlqUdSSWB+hw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Cw/+K3PQ; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="Cw/+K3PQ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 44FFA1F00A3C; Thu, 28 May 2026 10:01:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1779962465; bh=ltkI1QlGgz2vxucgJVCOfOUiQ4sA98eTB0hTiYNSY5g=; h=Subject:To:Cc:From:Date; b=Cw/+K3PQw0m3b9tnot3d1f/I8N30SrgCnjEFiAG0gC0H93qnAPp2kZny+Rp8Wd3jY nOrM5pJ2yA20airPEQLfOMfthiSA9wT+zbeywanWZGDpPO/Wdt4PXBsvh5apNaLsSN OhnGMaGVJhzJ9LVb1tpErewxUaIae/izGtC00kOU= Subject: FAILED: patch "[PATCH] ice: fix VF queue configuration with low MTU values" failed to apply to 5.15-stable tree To: jtornosm@redhat.com,anthony.l.nguyen@intel.com,jacob.e.keller@intel.com,kuba@kernel.org,michal.swiatkowski@linux.intel.com,pmenzel@molgen.mpg.de,rafal.romanowski@intel.com Cc: From: Date: Thu, 28 May 2026 12:00:05 +0200 Message-ID: <2026052805-scant-urologist-faac@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit The patch below does not apply to the 5.15-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 . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y git checkout FETCH_HEAD git cherry-pick -x 3ba4dd024d26372733d1c02e13e076c6016e3320 # git commit -s git send-email --to '' --in-reply-to '2026052805-scant-urologist-faac@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 3ba4dd024d26372733d1c02e13e076c6016e3320 Mon Sep 17 00:00:00 2001 From: Jose Ignacio Tornos Martinez Date: Fri, 15 May 2026 11:24:09 -0700 Subject: [PATCH] ice: fix VF queue configuration with low MTU values The ice driver's VF queue configuration validation rejects databuffer_size values below 1024 bytes, which prevents VFs from using MTU values below 871 bytes. The iavf driver calculates databuffer_size based on the MTU using: databuffer_size = ALIGN(MTU + LIBETH_RX_LL_LEN, 128) where LIBETH_RX_LL_LEN = 26 (ETH_HLEN + 2*VLAN_HLEN + ETH_FCS_LEN). For MTU values below 871: MTU 870: 870 + 26 = 896, aligned to 128 = 896 (< 1024, rejected) MTU 871: 871 + 26 = 897, aligned to 128 = 1024 (>= 1024, accepted) The 1024-byte minimum seems unnecessarily restrictive, because the hardware supports databuffer_size as low as 128 bytes (the alignment boundary), which should allow MTU values down to the standard minimum of 68 bytes. I haven't found the reason why the limit was configured in the commit 9c7dd7566d18 ("ice: add validation in OP_CONFIG_VSI_QUEUES VF message"), so with no more information and since it is working, change the minimum databuffer_size validation from 1024 to 128 bytes to allow standard low MTU values while still preventing invalid configurations. Fixes: 9c7dd7566d18 ("ice: add validation in OP_CONFIG_VSI_QUEUES VF message") cc: stable@vger.kernel.org Signed-off-by: Jose Ignacio Tornos Martinez Reviewed-by: Jacob Keller Reviewed-by: Michal Swiatkowski Reviewed-by: Paul Menzel Tested-by: Rafal Romanowski Signed-off-by: Tony Nguyen Link: https://patch.msgid.link/20260515182419.1597859-3-anthony.l.nguyen@intel.com Signed-off-by: Jakub Kicinski diff --git a/drivers/net/ethernet/intel/ice/virt/queues.c b/drivers/net/ethernet/intel/ice/virt/queues.c index f73d5a3e83d4..31be2f76181c 100644 --- a/drivers/net/ethernet/intel/ice/virt/queues.c +++ b/drivers/net/ethernet/intel/ice/virt/queues.c @@ -840,7 +840,7 @@ int ice_vc_cfg_qs_msg(struct ice_vf *vf, u8 *msg) if (qpi->rxq.databuffer_size != 0 && (qpi->rxq.databuffer_size > ((16 * 1024) - 128) || - qpi->rxq.databuffer_size < 1024)) + qpi->rxq.databuffer_size < 128)) goto error_param; ring->rx_buf_len = qpi->rxq.databuffer_size;