From patchwork Thu Oct 8 18:45:26 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jonathan Lemon X-Patchwork-Id: 11824343 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=-12.7 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 9047AC433DF for ; Thu, 8 Oct 2020 18:45:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 33C6B221FE for ; Thu, 8 Oct 2020 18:45:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729358AbgJHSpk convert rfc822-to-8bit (ORCPT ); Thu, 8 Oct 2020 14:45:40 -0400 Received: from mx0b-00082601.pphosted.com ([67.231.153.30]:13252 "EHLO mx0b-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729235AbgJHSpj (ORCPT ); Thu, 8 Oct 2020 14:45:39 -0400 Received: from pps.filterd (m0109331.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 098IXJIa021767 for ; Thu, 8 Oct 2020 11:45:38 -0700 Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com with ESMTP id 34140921rj-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Thu, 08 Oct 2020 11:45:38 -0700 Received: from intmgw004.03.ash8.facebook.com (2620:10d:c085:208::11) by mail.thefacebook.com (2620:10d:c085:11d::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1979.3; Thu, 8 Oct 2020 11:45:36 -0700 Received: by devvm2494.atn0.facebook.com (Postfix, from userid 172786) id 59042247B681; Thu, 8 Oct 2020 11:45:26 -0700 (PDT) From: Jonathan Lemon To: , , CC: Subject: [PATCH net-next] mlx4: handle non-napi callers to napi_poll Date: Thu, 8 Oct 2020 11:45:26 -0700 Message-ID: <20201008184526.3196768-1-jonathan.lemon@gmail.com> X-Mailer: git-send-email 2.24.1 MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235,18.0.687 definitions=2020-10-08_12:2020-10-08,2020-10-08 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 malwarescore=0 mlxscore=0 mlxlogscore=469 impostorscore=0 lowpriorityscore=0 suspectscore=0 adultscore=0 spamscore=0 clxscore=1034 priorityscore=1501 phishscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2010080133 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Jonathan Lemon netcons calls napi_poll with a budget of 0 to transmit packets. Handle this by: - skipping RX processing - do not try to recycle TX packets to the RX cache Signed-off-by: Jonathan Lemon Reviewed-by: Tariq Toukan --- drivers/net/ethernet/mellanox/mlx4/en_rx.c | 3 +++ drivers/net/ethernet/mellanox/mlx4/en_tx.c | 2 +- 2 files changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/mellanox/mlx4/en_rx.c b/drivers/net/ethernet/mellanox/mlx4/en_rx.c index 99d7737e8ad6..502d1b97855c 100644 --- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c +++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c @@ -943,6 +943,9 @@ int mlx4_en_poll_rx_cq(struct napi_struct *napi, int budget) bool clean_complete = true; int done; + if (!budget) + return 0; + if (priv->tx_ring_num[TX_XDP]) { xdp_tx_cq = priv->tx_cq[TX_XDP][cq->ring]; if (xdp_tx_cq->xdp_busy) { diff --git a/drivers/net/ethernet/mellanox/mlx4/en_tx.c b/drivers/net/ethernet/mellanox/mlx4/en_tx.c index 45869b29368f..3ddb7268e415 100644 --- a/drivers/net/ethernet/mellanox/mlx4/en_tx.c +++ b/drivers/net/ethernet/mellanox/mlx4/en_tx.c @@ -350,7 +350,7 @@ u32 mlx4_en_recycle_tx_desc(struct mlx4_en_priv *priv, .dma = tx_info->map0_dma, }; - if (!mlx4_en_rx_recycle(ring->recycle_ring, &frame)) { + if (!napi_mode || !mlx4_en_rx_recycle(ring->recycle_ring, &frame)) { dma_unmap_page(priv->ddev, tx_info->map0_dma, PAGE_SIZE, priv->dma_dir); put_page(tx_info->page);