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r8152: set the RMS of RTL8153 according to the mtu 

Set the received maximum size (RMS) according to the mtu size. It is
unnecessary to receive a packet which is more than the size we could
transmit. Besides, this could let the rx buffer be used effectively.

Signed-off-by: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
hayeswang 2017-03-20 16:13:44 +08:00 committed by David S. Miller
parent a05d4fd917
commit 210c4f70b4
1 changed files with 12 additions and 4 deletions
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16
drivers/net/usb/r8152.c
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@ -2899,7 +2899,8 @@ static void r8153_first_init(struct r8152 *tp)
rtl_rx_vlan_en(tp, tp->netdev->features & NETIF_F_HW_VLAN_CTAG_RX);
ocp_write_word(tp, MCU_TYPE_PLA, PLA_RMS, RTL8153_RMS);
ocp_data = tp->netdev->mtu + VLAN_ETH_HLEN + CRC_SIZE;
ocp_write_word(tp, MCU_TYPE_PLA, PLA_RMS, ocp_data);
ocp_write_byte(tp, MCU_TYPE_PLA, PLA_MTPS, MTPS_JUMBO);
ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_TCR0);
@ -2951,7 +2952,8 @@ static void r8153_enter_oob(struct r8152 *tp)
usleep_range(1000, 2000);
}
ocp_write_word(tp, MCU_TYPE_PLA, PLA_RMS, RTL8153_RMS);
ocp_data = tp->netdev->mtu + VLAN_ETH_HLEN + CRC_SIZE;
ocp_write_word(tp, MCU_TYPE_PLA, PLA_RMS, ocp_data);
ocp_data = ocp_read_word(tp, MCU_TYPE_PLA, PLA_TEREDO_CFG);
ocp_data &= ~TEREDO_WAKE_MASK;
@ -4201,8 +4203,14 @@ static int rtl8152_change_mtu(struct net_device *dev, int new_mtu)
dev->mtu = new_mtu;
if (netif_running(dev) && netif_carrier_ok(dev))
r8153_set_rx_early_size(tp);
if (netif_running(dev)) {
u32 rms = new_mtu + VLAN_ETH_HLEN + CRC_SIZE;
ocp_write_word(tp, MCU_TYPE_PLA, PLA_RMS, rms);
if (netif_carrier_ok(dev))
r8153_set_rx_early_size(tp);
}
mutex_unlock(&tp->control);