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pch_gbe: added the process of FIFO over run error 

This patch added the processing which should be done to hardware,
when a FIFO over run error occurred.

Signed-off-by: Toshiharu Okada <toshiharu-linux@dsn.okisemi.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Toshiharu Okada 2011-09-01 14:20:08 +00:00 committed by David S. Miller
parent 5229d87edc
commit 124d770a64
2 changed files with 178 additions and 103 deletions
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12
drivers/net/pch_gbe/pch_gbe.h
View File

@ -127,8 +127,8 @@ struct pch_gbe_regs {
/* Reset */
#define PCH_GBE_ALL_RST 0x80000000 /* All reset */
#define PCH_GBE_TX_RST 0x40000000 /* TX MAC, TX FIFO, TX DMA reset */
#define PCH_GBE_RX_RST 0x04000000 /* RX MAC, RX FIFO, RX DMA reset */
#define PCH_GBE_TX_RST 0x00008000 /* TX MAC, TX FIFO, TX DMA reset */
#define PCH_GBE_RX_RST 0x00004000 /* RX MAC, RX FIFO, RX DMA reset */
/* TCP/IP Accelerator Control */
#define PCH_GBE_EX_LIST_EN 0x00000008 /* External List Enable */
@ -276,6 +276,9 @@ struct pch_gbe_regs {
#define PCH_GBE_RX_DMA_EN 0x00000002 /* Enables Receive DMA */
#define PCH_GBE_TX_DMA_EN 0x00000001 /* Enables Transmission DMA */
/* RX DMA STATUS */
#define PCH_GBE_IDLE_CHECK 0xFFFFFFFE
/* Wake On LAN Status */
#define PCH_GBE_WLS_BR 0x00000008 /* Broadcas Address */
#define PCH_GBE_WLS_MLT 0x00000004 /* Multicast Address */
@ -471,6 +474,7 @@ struct pch_gbe_tx_desc {
struct pch_gbe_buffer {
struct sk_buff *skb;
dma_addr_t dma;
unsigned char *rx_buffer;
unsigned long time_stamp;
u16 length;
bool mapped;
@ -511,6 +515,9 @@ struct pch_gbe_tx_ring {
struct pch_gbe_rx_ring {
struct pch_gbe_rx_desc *desc;
dma_addr_t dma;
unsigned char *rx_buff_pool;
dma_addr_t rx_buff_pool_logic;
unsigned int rx_buff_pool_size;
unsigned int size;
unsigned int count;
unsigned int next_to_use;
@ -622,6 +629,7 @@ struct pch_gbe_adapter {
unsigned long rx_buffer_len;
unsigned long tx_queue_len;
bool have_msi;
bool rx_stop_flag;
};
extern const char pch_driver_version[];

269
drivers/net/pch_gbe/pch_gbe_main.c
View File

@ -20,7 +20,6 @@
#include "pch_gbe.h"
#include "pch_gbe_api.h"
#include <linux/prefetch.h>
#define DRV_VERSION "1.00"
const char pch_driver_version[] = DRV_VERSION;
@ -34,6 +33,7 @@ const char pch_driver_version[] = DRV_VERSION;
#define PCH_GBE_WATCHDOG_PERIOD (1 * HZ) /* watchdog time */
#define PCH_GBE_COPYBREAK_DEFAULT 256
#define PCH_GBE_PCI_BAR 1
#define PCH_GBE_RESERVE_MEMORY 0x200000 /* 2MB */
/* Macros for ML7223 */
#define PCI_VENDOR_ID_ROHM 0x10db
@ -52,6 +52,7 @@ const char pch_driver_version[] = DRV_VERSION;
)
/* Ethertype field values */
#define PCH_GBE_MAX_RX_BUFFER_SIZE 0x2880
#define PCH_GBE_MAX_JUMBO_FRAME_SIZE 10318
#define PCH_GBE_FRAME_SIZE_2048 2048
#define PCH_GBE_FRAME_SIZE_4096 4096
@ -83,10 +84,12 @@ const char pch_driver_version[] = DRV_VERSION;
#define PCH_GBE_INT_ENABLE_MASK ( \
PCH_GBE_INT_RX_DMA_CMPLT | \
PCH_GBE_INT_RX_DSC_EMP | \
PCH_GBE_INT_RX_FIFO_ERR | \
PCH_GBE_INT_WOL_DET | \
PCH_GBE_INT_TX_CMPLT \
)
#define PCH_GBE_INT_DISABLE_ALL 0
static unsigned int copybreak __read_mostly = PCH_GBE_COPYBREAK_DEFAULT;
@ -138,6 +141,27 @@ static void pch_gbe_wait_clr_bit(void *reg, u32 bit)
if (!tmp)
pr_err("Error: busy bit is not cleared\n");
}
/**
* pch_gbe_wait_clr_bit_irq - Wait to clear a bit for interrupt context
* @reg: Pointer of register
* @busy: Busy bit
*/
static int pch_gbe_wait_clr_bit_irq(void *reg, u32 bit)
{
u32 tmp;
int ret = -1;
/* wait busy */
tmp = 20;
while ((ioread32(reg) & bit) && --tmp)
udelay(5);
if (!tmp)
pr_err("Error: busy bit is not cleared\n");
else
ret = 0;
return ret;
}
/**
* pch_gbe_mac_mar_set - Set MAC address register
* @hw: Pointer to the HW structure
@ -189,6 +213,17 @@ static void pch_gbe_mac_reset_hw(struct pch_gbe_hw *hw)
return;
}
static void pch_gbe_mac_reset_rx(struct pch_gbe_hw *hw)
{
/* Read the MAC address. and store to the private data */
pch_gbe_mac_read_mac_addr(hw);
iowrite32(PCH_GBE_RX_RST, &hw->reg->RESET);
pch_gbe_wait_clr_bit_irq(&hw->reg->RESET, PCH_GBE_RX_RST);
/* Setup the MAC address */
pch_gbe_mac_mar_set(hw, hw->mac.addr, 0);
return;
}
/**
* pch_gbe_mac_init_rx_addrs - Initialize receive address's
* @hw: Pointer to the HW structure
@ -671,13 +706,8 @@ static void pch_gbe_setup_rctl(struct pch_gbe_adapter *adapter)
tcpip = ioread32(&hw->reg->TCPIP_ACC);
if (netdev->features & NETIF_F_RXCSUM) {
tcpip &= ~PCH_GBE_RX_TCPIPACC_OFF;
tcpip |= PCH_GBE_RX_TCPIPACC_EN;
} else {
tcpip |= PCH_GBE_RX_TCPIPACC_OFF;
tcpip &= ~PCH_GBE_RX_TCPIPACC_EN;
}
tcpip |= PCH_GBE_RX_TCPIPACC_OFF;
tcpip &= ~PCH_GBE_RX_TCPIPACC_EN;
iowrite32(tcpip, &hw->reg->TCPIP_ACC);
return;
}
@ -1090,6 +1120,35 @@ void pch_gbe_update_stats(struct pch_gbe_adapter *adapter)
spin_unlock_irqrestore(&adapter->stats_lock, flags);
}
static void pch_gbe_stop_receive(struct pch_gbe_adapter *adapter)
{
struct pch_gbe_hw *hw = &adapter->hw;
u32 rxdma;
u16 value;
int ret;
/* Disable Receive DMA */
rxdma = ioread32(&hw->reg->DMA_CTRL);
rxdma &= ~PCH_GBE_RX_DMA_EN;
iowrite32(rxdma, &hw->reg->DMA_CTRL);
/* Wait Rx DMA BUS is IDLE */
ret = pch_gbe_wait_clr_bit_irq(&hw->reg->RX_DMA_ST, PCH_GBE_IDLE_CHECK);
if (ret) {
/* Disable Bus master */
pci_read_config_word(adapter->pdev, PCI_COMMAND, &value);
value &= ~PCI_COMMAND_MASTER;
pci_write_config_word(adapter->pdev, PCI_COMMAND, value);
/* Stop Receive */
pch_gbe_mac_reset_rx(hw);
/* Enable Bus master */
value |= PCI_COMMAND_MASTER;
pci_write_config_word(adapter->pdev, PCI_COMMAND, value);
} else {
/* Stop Receive */
pch_gbe_mac_reset_rx(hw);
}
}
static void pch_gbe_start_receive(struct pch_gbe_hw *hw)
{
u32 rxdma;
@ -1129,7 +1188,15 @@ static irqreturn_t pch_gbe_intr(int irq, void *data)
if (int_st & PCH_GBE_INT_RX_FRAME_ERR)
adapter->stats.intr_rx_frame_err_count++;
if (int_st & PCH_GBE_INT_RX_FIFO_ERR)
adapter->stats.intr_rx_fifo_err_count++;
if (!adapter->rx_stop_flag) {
adapter->stats.intr_rx_fifo_err_count++;
pr_debug("Rx fifo over run\n");
adapter->rx_stop_flag = true;
int_en = ioread32(&hw->reg->INT_EN);
iowrite32((int_en & ~PCH_GBE_INT_RX_FIFO_ERR),
&hw->reg->INT_EN);
pch_gbe_stop_receive(adapter);
}
if (int_st & PCH_GBE_INT_RX_DMA_ERR)
adapter->stats.intr_rx_dma_err_count++;
if (int_st & PCH_GBE_INT_TX_FIFO_ERR)
@ -1141,7 +1208,7 @@ static irqreturn_t pch_gbe_intr(int irq, void *data)
/* When Rx descriptor is empty */
if ((int_st & PCH_GBE_INT_RX_DSC_EMP)) {
adapter->stats.intr_rx_dsc_empty_count++;
pr_err("Rx descriptor is empty\n");
pr_debug("Rx descriptor is empty\n");
int_en = ioread32(&hw->reg->INT_EN);
iowrite32((int_en & ~PCH_GBE_INT_RX_DSC_EMP), &hw->reg->INT_EN);
if (hw->mac.tx_fc_enable) {
@ -1191,29 +1258,23 @@ pch_gbe_alloc_rx_buffers(struct pch_gbe_adapter *adapter,
unsigned int i;
unsigned int bufsz;
bufsz = adapter->rx_buffer_len + PCH_GBE_DMA_ALIGN;
bufsz = adapter->rx_buffer_len + NET_IP_ALIGN;
i = rx_ring->next_to_use;
while ((cleaned_count--)) {
buffer_info = &rx_ring->buffer_info[i];
skb = buffer_info->skb;
if (skb) {
skb_trim(skb, 0);
} else {
skb = netdev_alloc_skb(netdev, bufsz);
if (unlikely(!skb)) {
/* Better luck next round */
adapter->stats.rx_alloc_buff_failed++;
break;
}
/* 64byte align */
skb_reserve(skb, PCH_GBE_DMA_ALIGN);
buffer_info->skb = skb;
buffer_info->length = adapter->rx_buffer_len;
skb = netdev_alloc_skb(netdev, bufsz);
if (unlikely(!skb)) {
/* Better luck next round */
adapter->stats.rx_alloc_buff_failed++;
break;
}
/* align */
skb_reserve(skb, NET_IP_ALIGN);
buffer_info->skb = skb;
buffer_info->dma = dma_map_single(&pdev->dev,
skb->data,
buffer_info->rx_buffer,
buffer_info->length,
DMA_FROM_DEVICE);
if (dma_mapping_error(&adapter->pdev->dev, buffer_info->dma)) {
@ -1246,6 +1307,36 @@ pch_gbe_alloc_rx_buffers(struct pch_gbe_adapter *adapter,
return;
}
static int
pch_gbe_alloc_rx_buffers_pool(struct pch_gbe_adapter *adapter,
struct pch_gbe_rx_ring *rx_ring, int cleaned_count)
{
struct pci_dev *pdev = adapter->pdev;
struct pch_gbe_buffer *buffer_info;
unsigned int i;
unsigned int bufsz;
unsigned int size;
bufsz = adapter->rx_buffer_len;
size = rx_ring->count * bufsz + PCH_GBE_RESERVE_MEMORY;
rx_ring->rx_buff_pool = dma_alloc_coherent(&pdev->dev, size,
&rx_ring->rx_buff_pool_logic,
GFP_KERNEL);
if (!rx_ring->rx_buff_pool) {
pr_err("Unable to allocate memory for the receive poll buffer\n");
return -ENOMEM;
}
memset(rx_ring->rx_buff_pool, 0, size);
rx_ring->rx_buff_pool_size = size;
for (i = 0; i < rx_ring->count; i++) {
buffer_info = &rx_ring->buffer_info[i];
buffer_info->rx_buffer = rx_ring->rx_buff_pool + bufsz * i;
buffer_info->length = bufsz;
}
return 0;
}
/**
* pch_gbe_alloc_tx_buffers - Allocate transmit buffers
* @adapter: Board private structure
@ -1386,7 +1477,7 @@ pch_gbe_clean_rx(struct pch_gbe_adapter *adapter,
unsigned int i;
unsigned int cleaned_count = 0;
bool cleaned = false;
struct sk_buff *skb, *new_skb;
struct sk_buff *skb;
u8 dma_status;
u16 gbec_status;
u32 tcp_ip_status;
@ -1407,13 +1498,12 @@ pch_gbe_clean_rx(struct pch_gbe_adapter *adapter,
rx_desc->gbec_status = DSC_INIT16;
buffer_info = &rx_ring->buffer_info[i];
skb = buffer_info->skb;
buffer_info->skb = NULL;
/* unmap dma */
dma_unmap_single(&pdev->dev, buffer_info->dma,
buffer_info->length, DMA_FROM_DEVICE);
buffer_info->mapped = false;
/* Prefetch the packet */
prefetch(skb->data);
pr_debug("RxDecNo = 0x%04x Status[DMA:0x%02x GBE:0x%04x "
"TCP:0x%08x] BufInf = 0x%p\n",
@ -1433,70 +1523,16 @@ pch_gbe_clean_rx(struct pch_gbe_adapter *adapter,
pr_err("Receive CRC Error\n");
} else {
/* get receive length */
/* length convert[-3] */
length = (rx_desc->rx_words_eob) - 3;
/* length convert[-3], length includes FCS length */
length = (rx_desc->rx_words_eob) - 3 - ETH_FCS_LEN;
if (rx_desc->rx_words_eob & 0x02)
length = length - 4;
/*
* buffer_info->rx_buffer: [Header:14][payload]
* skb->data: [Reserve:2][Header:14][payload]
*/
memcpy(skb->data, buffer_info->rx_buffer, length);
/* Decide the data conversion method */
if (!(netdev->features & NETIF_F_RXCSUM)) {
/* [Header:14][payload] */
if (NET_IP_ALIGN) {
/* Because alignment differs,
* the new_skb is newly allocated,
* and data is copied to new_skb.*/
new_skb = netdev_alloc_skb(netdev,
length + NET_IP_ALIGN);
if (!new_skb) {
/* dorrop error */
pr_err("New skb allocation "
"Error\n");
goto dorrop;
}
skb_reserve(new_skb, NET_IP_ALIGN);
memcpy(new_skb->data, skb->data,
length);
skb = new_skb;
} else {
/* DMA buffer is used as SKB as it is.*/
buffer_info->skb = NULL;
}
} else {
/* [Header:14][padding:2][payload] */
/* The length includes padding length */
length = length - PCH_GBE_DMA_PADDING;
if ((length < copybreak) ||
(NET_IP_ALIGN != PCH_GBE_DMA_PADDING)) {
/* Because alignment differs,
* the new_skb is newly allocated,
* and data is copied to new_skb.
* Padding data is deleted
* at the time of a copy.*/
new_skb = netdev_alloc_skb(netdev,
length + NET_IP_ALIGN);
if (!new_skb) {
/* dorrop error */
pr_err("New skb allocation "
"Error\n");
goto dorrop;
}
skb_reserve(new_skb, NET_IP_ALIGN);
memcpy(new_skb->data, skb->data,
ETH_HLEN);
memcpy(&new_skb->data[ETH_HLEN],
&skb->data[ETH_HLEN +
PCH_GBE_DMA_PADDING],
length - ETH_HLEN);
skb = new_skb;
} else {
/* Padding data is deleted
* by moving header data.*/
memmove(&skb->data[PCH_GBE_DMA_PADDING],
&skb->data[0], ETH_HLEN);
skb_reserve(skb, NET_IP_ALIGN);
buffer_info->skb = NULL;
}
}
/* The length includes FCS length */
length = length - ETH_FCS_LEN;
/* update status of driver */
adapter->stats.rx_bytes += length;
adapter->stats.rx_packets++;
@ -1515,7 +1551,6 @@ pch_gbe_clean_rx(struct pch_gbe_adapter *adapter,
pr_debug("Receive skb->ip_summed: %d length: %d\n",
skb->ip_summed, length);
}
dorrop:
/* return some buffers to hardware, one at a time is too slow */
if (unlikely(cleaned_count >= PCH_GBE_RX_BUFFER_WRITE)) {
pch_gbe_alloc_rx_buffers(adapter, rx_ring,
@ -1720,6 +1755,11 @@ int pch_gbe_up(struct pch_gbe_adapter *adapter)
pr_err("Error: can't bring device up\n");
return err;
}
err = pch_gbe_alloc_rx_buffers_pool(adapter, rx_ring, rx_ring->count);
if (err) {
pr_err("Error: can't bring device up\n");
return err;
}
pch_gbe_alloc_tx_buffers(adapter, tx_ring);
pch_gbe_alloc_rx_buffers(adapter, rx_ring, rx_ring->count);
adapter->tx_queue_len = netdev->tx_queue_len;
@ -1741,6 +1781,7 @@ int pch_gbe_up(struct pch_gbe_adapter *adapter)
void pch_gbe_down(struct pch_gbe_adapter *adapter)
{
struct net_device *netdev = adapter->netdev;
struct pch_gbe_rx_ring *rx_ring = adapter->rx_ring;
/* signal that we're down so the interrupt handler does not
* reschedule our watchdog timer */
@ -1759,6 +1800,12 @@ void pch_gbe_down(struct pch_gbe_adapter *adapter)
pch_gbe_reset(adapter);
pch_gbe_clean_tx_ring(adapter, adapter->tx_ring);
pch_gbe_clean_rx_ring(adapter, adapter->rx_ring);
pci_free_consistent(adapter->pdev, rx_ring->rx_buff_pool_size,
rx_ring->rx_buff_pool, rx_ring->rx_buff_pool_logic);
rx_ring->rx_buff_pool_logic = 0;
rx_ring->rx_buff_pool_size = 0;
rx_ring->rx_buff_pool = NULL;
}
/**
@ -2011,6 +2058,8 @@ static int pch_gbe_change_mtu(struct net_device *netdev, int new_mtu)
{
struct pch_gbe_adapter *adapter = netdev_priv(netdev);
int max_frame;
unsigned long old_rx_buffer_len = adapter->rx_buffer_len;
int err;
max_frame = new_mtu + ETH_HLEN + ETH_FCS_LEN;
if ((max_frame < ETH_ZLEN + ETH_FCS_LEN) ||
@ -2025,14 +2074,24 @@ static int pch_gbe_change_mtu(struct net_device *netdev, int new_mtu)
else if (max_frame <= PCH_GBE_FRAME_SIZE_8192)
adapter->rx_buffer_len = PCH_GBE_FRAME_SIZE_8192;
else
adapter->rx_buffer_len = PCH_GBE_MAX_JUMBO_FRAME_SIZE;
netdev->mtu = new_mtu;
adapter->hw.mac.max_frame_size = max_frame;
adapter->rx_buffer_len = PCH_GBE_MAX_RX_BUFFER_SIZE;
if (netif_running(netdev))
pch_gbe_reinit_locked(adapter);
else
if (netif_running(netdev)) {
pch_gbe_down(adapter);
err = pch_gbe_up(adapter);
if (err) {
adapter->rx_buffer_len = old_rx_buffer_len;
pch_gbe_up(adapter);
return -ENOMEM;
} else {
netdev->mtu = new_mtu;
adapter->hw.mac.max_frame_size = max_frame;
}
} else {
pch_gbe_reset(adapter);
netdev->mtu = new_mtu;
adapter->hw.mac.max_frame_size = max_frame;
}
pr_debug("max_frame : %d rx_buffer_len : %d mtu : %d max_frame_size : %d\n",
max_frame, (u32) adapter->rx_buffer_len, netdev->mtu,
@ -2110,6 +2169,7 @@ static int pch_gbe_napi_poll(struct napi_struct *napi, int budget)
int work_done = 0;
bool poll_end_flag = false;
bool cleaned = false;
u32 int_en;
pr_debug("budget : %d\n", budget);
@ -2117,8 +2177,15 @@ static int pch_gbe_napi_poll(struct napi_struct *napi, int budget)
if (!netif_carrier_ok(netdev)) {
poll_end_flag = true;
} else {
cleaned = pch_gbe_clean_tx(adapter, adapter->tx_ring);
pch_gbe_clean_rx(adapter, adapter->rx_ring, &work_done, budget);
if (adapter->rx_stop_flag) {
adapter->rx_stop_flag = false;
pch_gbe_start_receive(&adapter->hw);
int_en = ioread32(&adapter->hw.reg->INT_EN);
iowrite32((int_en | PCH_GBE_INT_RX_FIFO_ERR),
&adapter->hw.reg->INT_EN);
}
cleaned = pch_gbe_clean_tx(adapter, adapter->tx_ring);
if (cleaned)
work_done = budget;