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* [PATCH V3 net-next] net: hns3: Add support to change MTU in HNS3 hardware
@ 2017-08-21 10:12 Salil Mehta
  2017-08-21 10:32 ` Leon Romanovsky
  2017-08-21 14:29 ` Andrew Lunn
  0 siblings, 2 replies; 7+ messages in thread
From: Salil Mehta @ 2017-08-21 10:12 UTC (permalink / raw)
  To: davem
  Cc: salil.mehta, yisen.zhuang, lipeng321, mehta.salil.lnk, netdev,
	linux-kernel, linux-rdma, linuxarm

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.
2. Initializes the supported MTU range for the netdevice.

Signed-off-by: lipeng <lipeng321@huawei.com>
Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
---
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 | 36 ++++++++++++++++++++++
 .../net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.h |  1 +
 2 files changed, 37 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..c087a9f 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_enet.c
@@ -1278,11 +1278,44 @@ 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))
+			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 +2785,9 @@ 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

^ permalink raw reply related	[flat|nested] 7+ messages in thread
end of thread, other threads:[~2017-08-21 15:05 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2017-08-21 10:12 [PATCH V3 net-next] net: hns3: Add support to change MTU in HNS3 hardware Salil Mehta
2017-08-21 10:32 ` Leon Romanovsky
2017-08-21 10:43   ` Salil Mehta
2017-08-21 14:29 ` Andrew Lunn
     [not found]   ` <20170821142939.GG1703-g2DYL2Zd6BY@public.gmane.org>
2017-08-21 14:32     ` Salil Mehta
     [not found]       ` <F4CC6FACFEB3C54C9141D49AD221F7F93B875655-WFPaWmAhWqtUuCJht5byYAK1hpo4iccwjNknBlVQO8k@public.gmane.org>
2017-08-21 14:47         ` Leon Romanovsky
     [not found]           ` <20170821144741.GN1724-U/DQcQFIOTAAJjI8aNfphQ@public.gmane.org>
2017-08-21 15:05             ` Salil Mehta

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