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Commit a8e8b7ff authored by Salil's avatar Salil Committed by David S. Miller
Browse files

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: default avatarlipeng <lipeng321@huawei.com>
Signed-off-by: default avatarSalil Mehta <salil.mehta@huawei.com>
Reviewed-by: default avatarAndrew Lunn <andrew@lunn.ch>
Reviewed-by: default avatarLeon Romanovsky <leonro@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 06552f8e

drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.c

+34 −0
Original line number Diff line number Diff line
@@ -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:

drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.h

+1 −0
Original line number Diff line number Diff line
@@ -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