netdev - RE: [PATCH V4 net-next] net: hns3: Add support to change MTU in HNS3 hardware

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Date:   Mon, 21 Aug 2017 14:49:30 +0000
From:   Salil Mehta <salil.mehta@...wei.com>
To:     "davem@...emloft.net" <davem@...emloft.net>
CC:     "Zhuangyuzeng (Yisen)" <yisen.zhuang@...wei.com>,
        "lipeng (Y)" <lipeng321@...wei.com>,
        "mehta.salil.lnk@...il.com" <mehta.salil.lnk@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        Linuxarm <linuxarm@...wei.com>
Subject: RE: [PATCH V4 net-next] net: hns3: Add support to change MTU in
 HNS3 hardware

Sorry, Please ignore this mail.

I forgot to add the Andrew Lunn signed-off-by Tag will this patch.
I will add the tag and send the updated version of V4 again.

Sorry again.

> -----Original Message-----
> From: Salil Mehta
> Sent: Monday, August 21, 2017 3:40 PM
> To: davem@...emloft.net
> Cc: Salil Mehta; Zhuangyuzeng (Yisen); lipeng (Y);
> mehta.salil.lnk@...il.com; netdev@...r.kernel.org; linux-
> kernel@...r.kernel.org; linux-rdma@...r.kernel.org; Linuxarm
> Subject: [PATCH V4 net-next] net: hns3: Add support to change MTU in
> HNS3 hardware
> 
> This patch adds the following support to the HNS3 driver:
> 1. Support to change the Maximum Transmission Unit of a
>    port in the HNS NIC hardware.
> 2. Initializes the supported MTU range for the netdevice.
> 
> Signed-off-by: lipeng <lipeng321@...wei.com>
> Signed-off-by: Salil Mehta <salil.mehta@...wei.com>
> ---
> PATCH V4: Addressed some minor comments Leon Romanovsky
>           1. https://lkml.org/lkml/2017/8/21/212
> PATCH V3: Addressed some minor comments Leon Romanovsky
>           1. https://lkml.org/lkml/2017/8/20/27
> 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 | 34
> ++++++++++++++++++++++
>  .../net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.h |  1 +
>  2 files changed, 35 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..1c3e294 100644
> --- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.c
> +++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.c
> @@ -1278,11 +1278,42 @@ 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 -EOPNOTSUPP;
> +
> +	/* 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 && hns3_nic_net_open(netdev))
> +		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 +2783,9 @@ 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
>