wil6210: limit MTU

Obey 802.11 spec that defines max. data size 7920 bytes

Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/wil6210/netdev.c b/drivers/net/wireless/ath/wil6210/netdev.c
index fdcaeb820e75..106b6dcb773a 100644
--- a/drivers/net/wireless/ath/wil6210/netdev.c
+++ b/drivers/net/wireless/ath/wil6210/netdev.c
@@ -32,12 +32,26 @@ static int wil_stop(struct net_device *ndev)
         return wil_down(wil);
 }
 
+static int wil_change_mtu(struct net_device *ndev, int new_mtu)
+{
+        struct wil6210_priv *wil = ndev_to_wil(ndev);
+
+        if (new_mtu < 68 || new_mtu > IEEE80211_MAX_DATA_LEN_DMG)
+                return -EINVAL;
+
+        wil_dbg_misc(wil, "change MTU %d -> %d\n", ndev->mtu, new_mtu);
+        ndev->mtu = new_mtu;
+
+        return 0;
+}
+
 static const struct net_device_ops wil_netdev_ops = {
         .ndo_open               = wil_open,
         .ndo_stop               = wil_stop,
         .ndo_start_xmit         = wil_start_xmit,
         .ndo_set_mac_address    = eth_mac_addr,
         .ndo_validate_addr      = eth_validate_addr,
+        .ndo_change_mtu         = wil_change_mtu,
 };
 
 static int wil6210_netdev_poll_rx(struct napi_struct *napi, int budget)