Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751307AbdHRLgt (ORCPT ); Fri, 18 Aug 2017 07:36:49 -0400 Received: from szxga05-in.huawei.com ([45.249.212.191]:4073 "EHLO szxga05-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750913AbdHRLgq (ORCPT ); Fri, 18 Aug 2017 07:36:46 -0400 From: Salil Mehta To: CC: , , , , , , , , Subject: [PATCH net-next] net: hns3: Add support to change MTU in hardware & netdev Date: Fri, 18 Aug 2017 12:35:58 +0100 Message-ID: <20170818113558.71928-1-salil.mehta@huawei.com> X-Mailer: git-send-email 2.8.3 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.203.181.151] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020206.5996D14C.00BA,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0, ip=0.0.0.0, so=2014-11-16 11:51:01, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 59be54fe679e881051a274d89b69621a Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3069 Lines: 96 This patch adds the following support to the HNS3 driver: 1. Support to change the Maximum Transmission Unit of a netdevice and of a port in hardware . 2. Initializes the supported MTU range for the netdevice. Signed-off-by: lipeng Signed-off-by: Salil Mehta --- .../net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.c | 46 ++++++++++++++++++++++ .../net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.h | 1 + 2 files changed, 47 insertions(+) diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.c index e731f87..8e3711e 100644 --- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.c +++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.c @@ -1278,11 +1278,53 @@ static int hns3_ndo_set_vf_vlan(struct net_device *netdev, int vf, u16 vlan, return ret; } +static int hns3_nic_change_mtu(struct net_device *netdev, int new_mtu) +{ + struct hns3_nic_priv *priv = netdev_priv(netdev); + struct hnae3_handle *h = priv->ae_handle; + bool if_running = netif_running(netdev); + int ret; + + /* no change in MTU */ + if (new_mtu == netdev->mtu) + return 0; + + if (!h->ae_algo->ops->set_mtu) + return -ENOTSUPP; + + /* if this was called with netdev up then bring netdevice down */ + if (if_running) { + (void)hns3_nic_net_stop(netdev); + msleep(100); + } + + ret = h->ae_algo->ops->set_mtu(h, new_mtu); + if (ret) { + netdev_err(netdev, "failed to change MTU in hardware %d\n", + ret); + return ret; + } + + /* assign newly changed mtu to netdevice as well */ + netdev->mtu = new_mtu; + + /* if the netdev was running earlier, bring it up again */ + if (if_running) { + if (hns3_nic_net_open(netdev)) { + netdev_err(netdev, "MTU, couldnt up netdev again\n"); + ret = -EINVAL; + } + } + + return ret; +} + static const struct net_device_ops hns3_nic_netdev_ops = { .ndo_open = hns3_nic_net_open, .ndo_stop = hns3_nic_net_stop, .ndo_start_xmit = hns3_nic_net_xmit, .ndo_set_mac_address = hns3_nic_net_set_mac_address, + .ndo_change_mtu = hns3_nic_change_mtu, .ndo_set_features = hns3_nic_set_features, .ndo_get_stats64 = hns3_nic_get_stats64, .ndo_setup_tc = hns3_nic_setup_tc, @@ -2752,6 +2794,10 @@ static int hns3_client_init(struct hnae3_handle *handle) goto out_reg_netdev_fail; } + /* MTU range: 68 - 9706 */ + netdev->min_mtu = ETH_MIN_MTU; + netdev->max_mtu = HNS3_MAX_MTU - (ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN); + return ret; out_reg_netdev_fail: diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.h b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.h index a6e8f15..7e87461 100644 --- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.h +++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.h @@ -76,6 +76,7 @@ enum hns3_nic_state { #define HNS3_RING_NAME_LEN 16 #define HNS3_BUFFER_SIZE_2048 2048 #define HNS3_RING_MAX_PENDING 32768 +#define HNS3_MAX_MTU 9728 #define HNS3_BD_SIZE_512_TYPE 0 #define HNS3_BD_SIZE_1024_TYPE 1 -- 2.7.4