On Sun, Aug 20, 2017 at 02:35:58PM +0000, Salil Mehta wrote: > Hi Leon > > > -----Original Message----- > > From: Leon Romanovsky [mailto:leon@xxxxxxxxxx] > > Sent: Sunday, August 20, 2017 8:05 AM > > To: Salil Mehta > > Cc: davem@xxxxxxxxxxxxx; Zhuangyuzeng (Yisen); lipeng (Y); > > mehta.salil.lnk@xxxxxxxxx; netdev@xxxxxxxxxxxxxxx; linux- > > kernel@xxxxxxxxxxxxxxx; linux-rdma@xxxxxxxxxxxxxxx; Linuxarm > > Subject: Re: [PATCH V2 net-next] net: hns3: Add support to change MTU > > in HNS3 hardware > > > > On Fri, Aug 18, 2017 at 05:57:59PM +0100, Salil Mehta wrote: > > > This patch adds the following support to the HNS3 driver: > > > 1. Support to change the Maximum Transmission Unit of a > > > of a port in the HNS NIC hardware . > > > > Extra space before dot. > Sure. > > > > > > 2. Initializes the supported MTU range for the netdevice. > > > > > > Signed-off-by: lipeng <lipeng321@xxxxxxxxxx> > > > > Does "lipeng" have name and surname? > Yes, Lipeng's first name is 'Peng' and Surname is 'Li' > But it is usually spelled as 'Lipeng' in one go when referring. > This is quite usual convention with full names originating from > China. Surnames comes first, followed by the first name and they > both are inseparable while they are written as well. Therefore, > his sign-off's appear like above. Thank you for the explanation. > > Thanks > Salil > > > > > Signed-off-by: Salil Mehta <salil.mehta@xxxxxxxxxx> > > > --- > > > PATCH V2: Addresses comments given by Andrew Lunn > > > 1. https://lkml.org/lkml/2017/8/18/282 > > > PATCH V1: Initial Submit > > > --- > > > .../net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.c | 38 > > ++++++++++++++++++++++ > > > .../net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.h | 1 + > > > 2 files changed, 39 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..d905ea1 100644 > > > --- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.c > > > +++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.c > > > @@ -1278,11 +1278,46 @@ 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; > > > + > > > + 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; > > > + } > > > + > > > + /* 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"); > > > > "couldnt" -> "couldn't" > > > > and you don't actually need this print. > > If the function hns3_nic_net_open fails, you will print this error > > there. > Right. Will remove this print. > > Thanks > Salil > > > > > + 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 +2787,9 @@ static int hns3_client_init(struct hnae3_handle > > *handle) > > > goto out_reg_netdev_fail; > > > } > > > > > > + /* MTU range: (ETH_MIN_MTU(kernel default) - 9706) */ > > > + 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 > > > > > >
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