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    Subject[PATCH V2 net 09/10] net: hns: adds limitation for debug port mtu
    Date
    From: Kejian Yan <yankejian@huawei.com>

    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>
    ---
    change log:
    PATCH V2:
    - use tabs instead of spaces to indent the value

    PATCH V1:
    - first submit

    Link: https://lkml.org/lkml/2016/3/21/217
    ---
    drivers/net/ethernet/hisilicon/hns/hns_dsaf_mac.c | 3 +++
    drivers/net/ethernet/hisilicon/hns/hns_dsaf_mac.h | 1 +
    2 files changed, 4 insertions(+)

    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
    --- 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
    --- 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

    --
    1.9.1
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