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 50237fbe3090626b9ec0f7ac25314bf9e58b5c87..a38084a22bf28a527b051cc0351624aa50a28086 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 7b47701daecaef39210d779631c8ba4ca9f85b50..823b6e78c8aadc36b239fcde643ad34790130274 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