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net: moxart: use correct accessors for DMA memory

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The moxart ethernet driver confuses coherent DMA buffers with
MMIO registers.

moxart_ether.c: In function 'moxart_mac_setup_desc_ring':
moxart_ether.c:146:428: error: passing argument 1 of '__fswab32' makes integer from pointer without a cast [-Werror=int-conversion]
moxart_ether.c:74:39: warning: incorrect type in argument 3 (different address spaces)
moxart_ether.c:74:39:    expected void *cpu_addr
moxart_ether.c:74:39:    got void [noderef] <asn:2>*tx_desc_base

This leaves the basic logic alone and uses normal pointers for
the virtual address of the descriptor. As we cannot use readl/writel
to access them, we also introduce our own moxart_desc_read
moxart_desc_write helpers that perform the same endianess swap
as the original code, but without the address space conversion.

The barriers are made explicit here where needed: Even in the worst-case
scenario, we just have to use a rmb() after checking ownership so
we don't read any input data before we are sure it is value, and we
use wmb() before transferring ownership back to the device.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arnd Bergmann 2016-01-28 17:54:33 +01:00 committed by David S. Miller
parent 52b79e2bdf
commit 59a557be38
2 changed files with 32 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
drivers/net/ethernet/moxa/moxart_ether.c
View File

@ -28,6 +28,16 @@
#include "moxart_ether.h"
static inline void moxart_desc_write(u32 data, u32 *desc)
{
*desc = cpu_to_le32(data);
}
static inline u32 moxart_desc_read(u32 *desc)
{
return le32_to_cpu(*desc);
}
static inline void moxart_emac_write(struct net_device *ndev,
unsigned int reg, unsigned long value)
{
@ -112,7 +122,7 @@ static void moxart_mac_enable(struct net_device *ndev)
static void moxart_mac_setup_desc_ring(struct net_device *ndev)
{
struct moxart_mac_priv_t *priv = netdev_priv(ndev);
void __iomem *desc;
void *desc;
int i;
for (i = 0; i < TX_DESC_NUM; i++) {
@ -121,7 +131,7 @@ static void moxart_mac_setup_desc_ring(struct net_device *ndev)
priv->tx_buf[i] = priv->tx_buf_base + priv->tx_buf_size * i;
}
writel(TX_DESC1_END, desc + TX_REG_OFFSET_DESC1);
moxart_desc_write(TX_DESC1_END, desc + TX_REG_OFFSET_DESC1);
priv->tx_head = 0;
priv->tx_tail = 0;
@ -129,8 +139,8 @@ static void moxart_mac_setup_desc_ring(struct net_device *ndev)
for (i = 0; i < RX_DESC_NUM; i++) {
desc = priv->rx_desc_base + i * RX_REG_DESC_SIZE;
memset(desc, 0, RX_REG_DESC_SIZE);
writel(RX_DESC0_DMA_OWN, desc + RX_REG_OFFSET_DESC0);
writel(RX_BUF_SIZE & RX_DESC1_BUF_SIZE_MASK,
moxart_desc_write(RX_DESC0_DMA_OWN, desc + RX_REG_OFFSET_DESC0);
moxart_desc_write(RX_BUF_SIZE & RX_DESC1_BUF_SIZE_MASK,
desc + RX_REG_OFFSET_DESC1);
priv->rx_buf[i] = priv->rx_buf_base + priv->rx_buf_size * i;
@ -141,12 +151,12 @@ static void moxart_mac_setup_desc_ring(struct net_device *ndev)
if (dma_mapping_error(&ndev->dev, priv->rx_mapping[i]))
netdev_err(ndev, "DMA mapping error\n");
writel(priv->rx_mapping[i],
moxart_desc_write(priv->rx_mapping[i],
desc + RX_REG_OFFSET_DESC2 + RX_DESC2_ADDRESS_PHYS);
writel(priv->rx_buf[i],
moxart_desc_write((uintptr_t)priv->rx_buf[i],
desc + RX_REG_OFFSET_DESC2 + RX_DESC2_ADDRESS_VIRT);
}
writel(RX_DESC1_END, desc + RX_REG_OFFSET_DESC1);
moxart_desc_write(RX_DESC1_END, desc + RX_REG_OFFSET_DESC1);
priv->rx_head = 0;
@ -201,14 +211,15 @@ static int moxart_rx_poll(struct napi_struct *napi, int budget)
napi);
struct net_device *ndev = priv->ndev;
struct sk_buff *skb;
void __iomem *desc;
void *desc;
unsigned int desc0, len;
int rx_head = priv->rx_head;
int rx = 0;
while (rx < budget) {
desc = priv->rx_desc_base + (RX_REG_DESC_SIZE * rx_head);
desc0 = readl(desc + RX_REG_OFFSET_DESC0);
desc0 = moxart_desc_read(desc + RX_REG_OFFSET_DESC0);
rmb(); /* ensure desc0 is up to date */
if (desc0 & RX_DESC0_DMA_OWN)
break;
@ -250,7 +261,8 @@ static int moxart_rx_poll(struct napi_struct *napi, int budget)
priv->stats.multicast++;
rx_next:
writel(RX_DESC0_DMA_OWN, desc + RX_REG_OFFSET_DESC0);
wmb(); /* prevent setting ownership back too early */
moxart_desc_write(RX_DESC0_DMA_OWN, desc + RX_REG_OFFSET_DESC0);
rx_head = RX_NEXT(rx_head);
priv->rx_head = rx_head;
@ -310,7 +322,7 @@ static irqreturn_t moxart_mac_interrupt(int irq, void *dev_id)
static int moxart_mac_start_xmit(struct sk_buff *skb, struct net_device *ndev)
{
struct moxart_mac_priv_t *priv = netdev_priv(ndev);
void __iomem *desc;
void *desc;
unsigned int len;
unsigned int tx_head = priv->tx_head;
u32 txdes1;
@ -319,11 +331,12 @@ static int moxart_mac_start_xmit(struct sk_buff *skb, struct net_device *ndev)
desc = priv->tx_desc_base + (TX_REG_DESC_SIZE * tx_head);
spin_lock_irq(&priv->txlock);
if (readl(desc + TX_REG_OFFSET_DESC0) & TX_DESC0_DMA_OWN) {
if (moxart_desc_read(desc + TX_REG_OFFSET_DESC0) & TX_DESC0_DMA_OWN) {
net_dbg_ratelimited("no TX space for packet\n");
priv->stats.tx_dropped++;
goto out_unlock;
}
rmb(); /* ensure data is only read that had TX_DESC0_DMA_OWN cleared */
len = skb->len > TX_BUF_SIZE ? TX_BUF_SIZE : skb->len;
@ -337,9 +350,9 @@ static int moxart_mac_start_xmit(struct sk_buff *skb, struct net_device *ndev)
priv->tx_len[tx_head] = len;
priv->tx_skb[tx_head] = skb;
writel(priv->tx_mapping[tx_head],
moxart_desc_write(priv->tx_mapping[tx_head],
desc + TX_REG_OFFSET_DESC2 + TX_DESC2_ADDRESS_PHYS);
writel(skb->data,
moxart_desc_write((uintptr_t)skb->data,
desc + TX_REG_OFFSET_DESC2 + TX_DESC2_ADDRESS_VIRT);
if (skb->len < ETH_ZLEN) {
@ -354,8 +367,9 @@ static int moxart_mac_start_xmit(struct sk_buff *skb, struct net_device *ndev)
txdes1 = TX_DESC1_LTS | TX_DESC1_FTS | (len & TX_DESC1_BUF_SIZE_MASK);
if (tx_head == TX_DESC_NUM_MASK)
txdes1 |= TX_DESC1_END;
writel(txdes1, desc + TX_REG_OFFSET_DESC1);
writel(TX_DESC0_DMA_OWN, desc + TX_REG_OFFSET_DESC0);
moxart_desc_write(txdes1, desc + TX_REG_OFFSET_DESC1);
wmb(); /* flush descriptor before transferring ownership */
moxart_desc_write(TX_DESC0_DMA_OWN, desc + TX_REG_OFFSET_DESC0);
/* start to send packet */
writel(0xffffffff, priv->base + REG_TX_POLL_DEMAND);

4
drivers/net/ethernet/moxa/moxart_ether.h
View File

@ -300,7 +300,7 @@ struct moxart_mac_priv_t {
dma_addr_t rx_base;
dma_addr_t rx_mapping[RX_DESC_NUM];
void __iomem *rx_desc_base;
void *rx_desc_base;
unsigned char *rx_buf_base;
unsigned char *rx_buf[RX_DESC_NUM];
unsigned int rx_head;
@ -308,7 +308,7 @@ struct moxart_mac_priv_t {
dma_addr_t tx_base;
dma_addr_t tx_mapping[TX_DESC_NUM];
void __iomem *tx_desc_base;
void *tx_desc_base;
unsigned char *tx_buf_base;
unsigned char *tx_buf[RX_DESC_NUM];
unsigned int tx_head;