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Date: Sun, 3 Jul 2016 15:32:31 +1000
From: Gavin Shan <gwshan@...ux.vnet.ibm.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, benh@...nel.crashing.org, joel@....id.au,
weixue@...stnetic.com, Gavin Shan <gwshan@...ux.vnet.ibm.com>
Subject: [PATCH net-next 08/10] net/farady: Support NCSI mode
This makes ftgmac100 driver support NCSI mode. The NCSI is enabled
on the interface if property "use-nc-si" or "use-ncsi" is found from
the device node in device tree.
* No PHY device is used when NCSI mode is enabled.
* The NCSI device (struct ncsi_dev) is created when probing the
device while it's enabled/started when the interface is brought
up.
* Hardware IP checksum dosn't work when NCSI mode is enabled. It
is disabled on enabled NCSI.
Signed-off-by: Gavin Shan <gwshan@...ux.vnet.ibm.com>
Acked-by: Joel Stanley <joel@....id.au>
---
drivers/net/ethernet/faraday/ftgmac100.c | 85 ++++++++++++++++++++++++++++----
1 file changed, 75 insertions(+), 10 deletions(-)
diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c
index 2c3f656..1cd4975 100644
--- a/drivers/net/ethernet/faraday/ftgmac100.c
+++ b/drivers/net/ethernet/faraday/ftgmac100.c
@@ -31,6 +31,7 @@
#include <linux/phy.h>
#include <linux/platform_device.h>
#include <net/ip.h>
+#include <net/ncsi.h>
#include "ftgmac100.h"
@@ -68,10 +69,13 @@ struct ftgmac100 {
struct net_device *netdev;
struct device *dev;
+ struct ncsi_dev *ndev;
struct napi_struct napi;
struct mii_bus *mii_bus;
int old_speed;
+ bool use_ncsi;
+ bool enabled;
};
static int ftgmac100_alloc_rx_page(struct ftgmac100 *priv,
@@ -1010,7 +1014,10 @@ static irqreturn_t ftgmac100_interrupt(int irq, void *dev_id)
struct net_device *netdev = dev_id;
struct ftgmac100 *priv = netdev_priv(netdev);
- if (likely(netif_running(netdev))) {
+ /* When running in NCSI mode, the interface should be ready for
+ * receiving or transmitting NCSI packets before it's opened.
+ */
+ if (likely(priv->use_ncsi || netif_running(netdev))) {
/* Disable interrupts for polling */
iowrite32(0, priv->base + FTGMAC100_OFFSET_IER);
napi_schedule(&priv->napi);
@@ -1123,17 +1130,33 @@ static int ftgmac100_open(struct net_device *netdev)
goto err_hw;
ftgmac100_init_hw(priv);
- ftgmac100_start_hw(priv, 10);
-
- phy_start(netdev->phydev);
+ ftgmac100_start_hw(priv, priv->use_ncsi ? 100 : 10);
+ if (netdev->phydev)
+ phy_start(netdev->phydev);
+ else if (priv->use_ncsi)
+ netif_carrier_on(netdev);
napi_enable(&priv->napi);
netif_start_queue(netdev);
/* enable all interrupts */
iowrite32(INT_MASK_ALL_ENABLED, priv->base + FTGMAC100_OFFSET_IER);
+
+ /* Start the NCSI device */
+ if (priv->use_ncsi) {
+ err = ncsi_start_dev(priv->ndev);
+ if (err)
+ goto err_ncsi;
+ }
+
+ priv->enabled = true;
+
return 0;
+err_ncsi:
+ napi_disable(&priv->napi);
+ netif_stop_queue(netdev);
+ iowrite32(0, priv->base + FTGMAC100_OFFSET_IER);
err_hw:
free_irq(priv->irq, netdev);
err_irq:
@@ -1146,12 +1169,17 @@ static int ftgmac100_stop(struct net_device *netdev)
{
struct ftgmac100 *priv = netdev_priv(netdev);
+ if (!priv->enabled)
+ return 0;
+
/* disable all interrupts */
+ priv->enabled = false;
iowrite32(0, priv->base + FTGMAC100_OFFSET_IER);
netif_stop_queue(netdev);
napi_disable(&priv->napi);
- phy_stop(netdev->phydev);
+ if (netdev->phydev)
+ phy_stop(netdev->phydev);
ftgmac100_stop_hw(priv);
free_irq(priv->irq, netdev);
@@ -1192,6 +1220,9 @@ static int ftgmac100_hard_start_xmit(struct sk_buff *skb,
/* optional */
static int ftgmac100_do_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
{
+ if (!netdev->phydev)
+ return -ENXIO;
+
return phy_mii_ioctl(netdev->phydev, ifr, cmd);
}
@@ -1258,6 +1289,15 @@ static void ftgmac100_destroy_mdio(struct net_device *netdev)
mdiobus_free(priv->mii_bus);
}
+static void ftgmac100_ncsi_handler(struct ncsi_dev *nd)
+{
+ if (unlikely(nd->state != ncsi_dev_state_functional))
+ return;
+
+ netdev_info(nd->dev, "NCSI interface %s\n",
+ nd->link_up ? "up" : "down");
+}
+
/******************************************************************************
* struct platform_driver functions
*****************************************************************************/
@@ -1267,7 +1307,7 @@ static int ftgmac100_probe(struct platform_device *pdev)
int irq;
struct net_device *netdev;
struct ftgmac100 *priv;
- int err;
+ int err = 0;
if (!pdev)
return -ENODEV;
@@ -1291,7 +1331,6 @@ static int ftgmac100_probe(struct platform_device *pdev)
netdev->ethtool_ops = &ftgmac100_ethtool_ops;
netdev->netdev_ops = &ftgmac100_netdev_ops;
- netdev->features = NETIF_F_IP_CSUM | NETIF_F_GRO;
platform_set_drvdata(pdev, netdev);
@@ -1326,9 +1365,34 @@ static int ftgmac100_probe(struct platform_device *pdev)
/* MAC address from chip or random one */
ftgmac100_setup_mac(priv);
- err = ftgmac100_setup_mdio(netdev);
- if (err)
- goto err_setup_mdio;
+ if (pdev->dev.of_node &&
+ of_get_property(pdev->dev.of_node, "use-ncsi", NULL)) {
+ if (!IS_ENABLED(CONFIG_NET_NCSI)) {
+ dev_err(&pdev->dev, "NCSI stack not enabled\n");
+ goto err_ncsi_dev;
+ }
+
+ dev_info(&pdev->dev, "Using NCSI interface\n");
+ priv->use_ncsi = true;
+ priv->ndev = ncsi_register_dev(netdev, ftgmac100_ncsi_handler);
+ if (!priv->ndev)
+ goto err_ncsi_dev;
+ } else {
+ priv->use_ncsi = false;
+ err = ftgmac100_setup_mdio(netdev);
+ if (err)
+ goto err_setup_mdio;
+ }
+
+ /* We have to disable on-chip IP checksum functionality
+ * when NCSI is enabled on the interface. It doesn't work
+ * in that case.
+ */
+ netdev->features = NETIF_F_IP_CSUM | NETIF_F_GRO;
+ if (priv->use_ncsi &&
+ of_get_property(pdev->dev.of_node, "no-hw-checksum", NULL))
+ netdev->features &= ~NETIF_F_IP_CSUM;
+
/* register network device */
err = register_netdev(netdev);
@@ -1341,6 +1405,7 @@ static int ftgmac100_probe(struct platform_device *pdev)
return 0;
+err_ncsi_dev:
err_register_netdev:
ftgmac100_destroy_mdio(netdev);
err_setup_mdio:
--
2.1.0
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