[PATCH 13/22] fjes: net_device_ops.ndo_change_mtu

[Taku Izumi]

This patch adds net_device_ops.ndo_change_mtu.

Signed-off-by: Taku Izumi <izumi.t...@jp.fujitsu.com>
---
 drivers/platform/x86/fjes/fjes_main.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/drivers/platform/x86/fjes/fjes_main.c 
b/drivers/platform/x86/fjes/fjes_main.c
index eeda824..72541a7 100644
--- a/drivers/platform/x86/fjes/fjes_main.c
+++ b/drivers/platform/x86/fjes/fjes_main.c
@@ -59,6 +59,7 @@ static void fjes_tx_stall_task(struct work_struct *);
 static irqreturn_t fjes_intr(int, void*);
 static struct rtnl_link_stats64
 *fjes_get_stats64(struct net_device *, struct rtnl_link_stats64 *);
+static int fjes_change_mtu(struct net_device *, int);
 
 static int fjes_acpi_add(struct acpi_device *);
 static int fjes_acpi_remove(struct acpi_device *);
@@ -226,6 +227,7 @@ static const struct net_device_ops fjes_netdev_ops = {
        .ndo_stop               = fjes_close,
        .ndo_start_xmit         = fjes_xmit_frame,
        .ndo_get_stats64        = fjes_get_stats64,
+       .ndo_change_mtu         = fjes_change_mtu,
 };
 
 /*
@@ -748,6 +750,34 @@ static struct rtnl_link_stats64
        return stats;
 }
 
+static int fjes_change_mtu(struct net_device *netdev, int new_mtu)
+{
+       int idx;
+       bool running = netif_running(netdev);
+       int ret = 0;
+
+       for (idx = 0; fjes_support_mtu[idx] != 0; idx++) {
+               if (new_mtu <= fjes_support_mtu[idx]) {
+
+                       new_mtu = fjes_support_mtu[idx];
+                       if (new_mtu == netdev->mtu)
+                               return 0;
+
+                       if (running)
+                               fjes_close(netdev);
+
+                       netdev->mtu = new_mtu;
+
+                       if (running)
+                               ret = fjes_open(netdev);
+
+                       return ret;
+               }
+       }
+
+       return -EINVAL;
+}
+
 static irqreturn_t fjes_intr(int irq, void *data)
 {
        struct fjes_adapter *adapter = data;
-- 
1.8.3.1

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