net: hns: adds limitation for debug port mtu

If mtu for debug port is set more than 1500, it may cause that packets
are dropped by ppe. So maximum value for debug port should be 1500.

Signed-off-by: Kejian Yan <yankejian@huawei.com>
Signed-off-by: Yisen Zhuang <Yisen.Zhuang@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_mac.c b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_mac.c
index 50237fb..a38084a 100644 (file)
--- a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_mac.c
+++ b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_mac.c
@@ -470,6 +470,9 @@ int hns_mac_set_mtu(struct hns_mac_cb *mac_cb, u32 new_mtu)
        u32 max_frm = AE_IS_VER1(mac_cb->dsaf_dev->dsaf_ver) ?
                        MAC_MAX_MTU : MAC_MAX_MTU_V2;
 
+       if (mac_cb->mac_type == HNAE_PORT_DEBUG)
+               max_frm = MAC_MAX_MTU_DBG;
+
        if ((new_mtu < MAC_MIN_MTU) || (new_frm > max_frm) ||
            (new_frm > HNS_RCB_RING_MAX_BD_PER_PKT * buf_size))
                return -EINVAL;

diff --git a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_mac.h b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_mac.h
index 7b47701..823b6e7 100644 (file)
--- a/drivers/net/ethernet/hisilicon/hns/hns_dsaf_mac.h
+++ b/drivers/net/ethernet/hisilicon/hns/hns_dsaf_mac.h
@@ -28,6 +28,7 @@ struct dsaf_device;
 #define MAC_MAX_MTU            9600
 #define MAC_MAX_MTU_V2         9728
 #define MAC_MIN_MTU            68
+#define MAC_MAX_MTU_DBG                MAC_DEFAULT_MTU
 
 #define MAC_DEFAULT_PAUSE_TIME 0xff