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r8152: fix flow control issue of RTL8156A 

The feature of flow control becomes abnormal, if the device sends a
pause frame and the tx/rx is disabled before sending a release frame. It
causes the lost of packets.

Set PLA_RX_FIFO_FULL and PLA_RX_FIFO_EMPTY to zeros before disabling the
tx/rx. And, toggle FC_PATCH_TASK before enabling tx/rx to reset the flow
control patch and timer. Then, the hardware could clear the state and
the flow control becomes normal after enabling tx/rx.

Besides, remove inline for fc_pause_on_auto() and fc_pause_off_auto().

Fixes: 195aae321c ("r8152: support new chips")
Signed-off-by: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hayes Wang 2023-04-28 16:53:29 +08:00 committed by David S. Miller
parent 526f28bd0f
commit 8ceda6d5a1
1 changed files with 36 additions and 20 deletions
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56
drivers/net/usb/r8152.c
View File

@ -5986,6 +5986,25 @@ static void rtl8153_disable(struct r8152 *tp)
r8153_aldps_en(tp, true);
}
static u32 fc_pause_on_auto(struct r8152 *tp)
{
return (ALIGN(mtu_to_size(tp->netdev->mtu), 1024) + 6 * 1024);
}
static u32 fc_pause_off_auto(struct r8152 *tp)
{
return (ALIGN(mtu_to_size(tp->netdev->mtu), 1024) + 14 * 1024);
}
static void r8156_fc_parameter(struct r8152 *tp)
{
u32 pause_on = tp->fc_pause_on ? tp->fc_pause_on : fc_pause_on_auto(tp);
u32 pause_off = tp->fc_pause_off ? tp->fc_pause_off : fc_pause_off_auto(tp);
ocp_write_word(tp, MCU_TYPE_PLA, PLA_RX_FIFO_FULL, pause_on / 16);
ocp_write_word(tp, MCU_TYPE_PLA, PLA_RX_FIFO_EMPTY, pause_off / 16);
}
static int rtl8156_enable(struct r8152 *tp)
{
u32 ocp_data;
@ -5994,6 +6013,7 @@ static int rtl8156_enable(struct r8152 *tp)
if (test_bit(RTL8152_UNPLUG, &tp->flags))
return -ENODEV;
r8156_fc_parameter(tp);
set_tx_qlen(tp);
rtl_set_eee_plus(tp);
r8153_set_rx_early_timeout(tp);
@ -6025,9 +6045,24 @@ static int rtl8156_enable(struct r8152 *tp)
ocp_write_word(tp, MCU_TYPE_USB, USB_L1_CTRL, ocp_data);
}
ocp_data = ocp_read_word(tp, MCU_TYPE_USB, USB_FW_TASK);
ocp_data &= ~FC_PATCH_TASK;
ocp_write_word(tp, MCU_TYPE_USB, USB_FW_TASK, ocp_data);
usleep_range(1000, 2000);
ocp_data |= FC_PATCH_TASK;
ocp_write_word(tp, MCU_TYPE_USB, USB_FW_TASK, ocp_data);
return rtl_enable(tp);
}
static void rtl8156_disable(struct r8152 *tp)
{
ocp_write_word(tp, MCU_TYPE_PLA, PLA_RX_FIFO_FULL, 0);
ocp_write_word(tp, MCU_TYPE_PLA, PLA_RX_FIFO_EMPTY, 0);
rtl8153_disable(tp);
}
static int rtl8156b_enable(struct r8152 *tp)
{
u32 ocp_data;
@ -6429,25 +6464,6 @@ static void rtl8153c_up(struct r8152 *tp)
r8153b_u1u2en(tp, true);
}
static inline u32 fc_pause_on_auto(struct r8152 *tp)
{
return (ALIGN(mtu_to_size(tp->netdev->mtu), 1024) + 6 * 1024);
}
static inline u32 fc_pause_off_auto(struct r8152 *tp)
{
return (ALIGN(mtu_to_size(tp->netdev->mtu), 1024) + 14 * 1024);
}
static void r8156_fc_parameter(struct r8152 *tp)
{
u32 pause_on = tp->fc_pause_on ? tp->fc_pause_on : fc_pause_on_auto(tp);
u32 pause_off = tp->fc_pause_off ? tp->fc_pause_off : fc_pause_off_auto(tp);
ocp_write_word(tp, MCU_TYPE_PLA, PLA_RX_FIFO_FULL, pause_on / 16);
ocp_write_word(tp, MCU_TYPE_PLA, PLA_RX_FIFO_EMPTY, pause_off / 16);
}
static void rtl8156_change_mtu(struct r8152 *tp)
{
u32 rx_max_size = mtu_to_size(tp->netdev->mtu);
@ -9340,7 +9356,7 @@ static int rtl_ops_init(struct r8152 *tp)
case RTL_VER_10:
ops->init = r8156_init;
ops->enable = rtl8156_enable;
ops->disable = rtl8153_disable;
ops->disable = rtl8156_disable;
ops->up = rtl8156_up;
ops->down = rtl8156_down;
ops->unload = rtl8153_unload;