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WSL2-Linux-Kernel
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net: fec: fix the error to get the previous BD entry 

Bug: error to get the previous BD entry. When the current BD
is the first BD, the previous BD entry must be the last BD,
not "bdp - 1" in current logic.

V4:
  * Optimize fec_enet_get_nextdesc() for code clean.
    Replace "ex_new_bd - ring_size" with "ex_base".
    Replace "new_bd - ring_size" with "base".

V3:
  * Restore the API name because David suggest to use fec_enet_
    prefix for all function in fec driver.
    So, change next_bd() -> fec_enet_get_nextdesc()
        change pre_bd()  -> fec_enet_get_prevdesc()
  * Reduce the two APIs parameters for easy to call.

V2:
  * Add tx_ring_size and rx_ring_size to struct fec_enet_private.
  * Replace api fec_enet_get_nextdesc() with next_bd().
    Replace api fec_enet_get_prevdesc() with pre_bd().

  * Move all ring size check logic to next_bd() and pre_bd(), which
    simplifies the code redundancy.

V1:
  * Add BD ring size check to get the previous BD entry in correctly.

Reviewed-by: Li Frank <B20596@freescale.com>
Signed-off-by: Fugang Duan  <B38611@freescale.com>
Acked-by: Frank Li <frank.li@freescale.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Duan Fugang-B38611 2013-09-03 10:41:18 +08:00 коммит произвёл David S. Miller
Родитель 639739b5e6
Коммит 36e24e2ee2
2 изменённых файлов: 77 добавлений и 46 удалений
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3
drivers/net/ethernet/freescale/fec.h
Просмотреть файл

@ -296,6 +296,9 @@ struct fec_enet_private {
/* The ring entries to be free()ed */
struct bufdesc *dirty_tx;
unsigned short tx_ring_size;
unsigned short rx_ring_size;
struct platform_device *pdev;
int opened;

120
drivers/net/ethernet/freescale/fec_main.c
Просмотреть файл

@ -239,22 +239,57 @@ MODULE_PARM_DESC(macaddr, "FEC Ethernet MAC address");
static int mii_cnt;
static struct bufdesc *fec_enet_get_nextdesc(struct bufdesc *bdp, int is_ex)
static inline
struct bufdesc *fec_enet_get_nextdesc(struct bufdesc *bdp, struct fec_enet_private *fep)
{
struct bufdesc_ex *ex = (struct bufdesc_ex *)bdp;
if (is_ex)
return (struct bufdesc *)(ex + 1);
struct bufdesc *new_bd = bdp + 1;
struct bufdesc_ex *ex_new_bd = (struct bufdesc_ex *)bdp + 1;
struct bufdesc_ex *ex_base;
struct bufdesc *base;
int ring_size;
if (bdp >= fep->tx_bd_base) {
base = fep->tx_bd_base;
ring_size = fep->tx_ring_size;
ex_base = (struct bufdesc_ex *)fep->tx_bd_base;
} else {
base = fep->rx_bd_base;
ring_size = fep->rx_ring_size;
ex_base = (struct bufdesc_ex *)fep->rx_bd_base;
}
if (fep->bufdesc_ex)
return (struct bufdesc *)((ex_new_bd >= (ex_base + ring_size)) ?
ex_base : ex_new_bd);
else
return bdp + 1;
return (new_bd >= (base + ring_size)) ?
base : new_bd;
}
static struct bufdesc *fec_enet_get_prevdesc(struct bufdesc *bdp, int is_ex)
static inline
struct bufdesc *fec_enet_get_prevdesc(struct bufdesc *bdp, struct fec_enet_private *fep)
{
struct bufdesc_ex *ex = (struct bufdesc_ex *)bdp;
if (is_ex)
return (struct bufdesc *)(ex - 1);
struct bufdesc *new_bd = bdp - 1;
struct bufdesc_ex *ex_new_bd = (struct bufdesc_ex *)bdp - 1;
struct bufdesc_ex *ex_base;
struct bufdesc *base;
int ring_size;
if (bdp >= fep->tx_bd_base) {
base = fep->tx_bd_base;
ring_size = fep->tx_ring_size;
ex_base = (struct bufdesc_ex *)fep->tx_bd_base;
} else {
base = fep->rx_bd_base;
ring_size = fep->rx_ring_size;
ex_base = (struct bufdesc_ex *)fep->rx_bd_base;
}
if (fep->bufdesc_ex)
return (struct bufdesc *)((ex_new_bd < ex_base) ?
(ex_new_bd + ring_size) : ex_new_bd);
else
return bdp - 1;
return (new_bd < base) ? (new_bd + ring_size) : new_bd;
}
static void *swap_buffer(void *bufaddr, int len)
@ -380,7 +415,7 @@ fec_enet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
}
}
bdp_pre = fec_enet_get_prevdesc(bdp, fep->bufdesc_ex);
bdp_pre = fec_enet_get_prevdesc(bdp, fep);
if ((id_entry->driver_data & FEC_QUIRK_ERR006358) &&
!(bdp_pre->cbd_sc & BD_ENET_TX_READY)) {
fep->delay_work.trig_tx = true;
@ -389,10 +424,7 @@ fec_enet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
}
/* If this was the last BD in the ring, start at the beginning again. */
if (status & BD_ENET_TX_WRAP)
bdp = fep->tx_bd_base;
else
bdp = fec_enet_get_nextdesc(bdp, fep->bufdesc_ex);
bdp = fec_enet_get_nextdesc(bdp, fep);
fep->cur_tx = bdp;
@ -417,18 +449,18 @@ static void fec_enet_bd_init(struct net_device *dev)
/* Initialize the receive buffer descriptors. */
bdp = fep->rx_bd_base;
for (i = 0; i < RX_RING_SIZE; i++) {
for (i = 0; i < fep->rx_ring_size; i++) {
/* Initialize the BD for every fragment in the page. */
if (bdp->cbd_bufaddr)
bdp->cbd_sc = BD_ENET_RX_EMPTY;
else
bdp->cbd_sc = 0;
bdp = fec_enet_get_nextdesc(bdp, fep->bufdesc_ex);
bdp = fec_enet_get_nextdesc(bdp, fep);
}
/* Set the last buffer to wrap */
bdp = fec_enet_get_prevdesc(bdp, fep->bufdesc_ex);
bdp = fec_enet_get_prevdesc(bdp, fep);
bdp->cbd_sc |= BD_SC_WRAP;
fep->cur_rx = fep->rx_bd_base;
@ -436,7 +468,7 @@ static void fec_enet_bd_init(struct net_device *dev)
/* ...and the same for transmit */
bdp = fep->tx_bd_base;
fep->cur_tx = bdp;
for (i = 0; i < TX_RING_SIZE; i++) {
for (i = 0; i < fep->tx_ring_size; i++) {
/* Initialize the BD for every fragment in the page. */
bdp->cbd_sc = 0;
@ -445,11 +477,11 @@ static void fec_enet_bd_init(struct net_device *dev)
fep->tx_skbuff[i] = NULL;
}
bdp->cbd_bufaddr = 0;
bdp = fec_enet_get_nextdesc(bdp, fep->bufdesc_ex);
bdp = fec_enet_get_nextdesc(bdp, fep);
}
/* Set the last buffer to wrap */
bdp = fec_enet_get_prevdesc(bdp, fep->bufdesc_ex);
bdp = fec_enet_get_prevdesc(bdp, fep);
bdp->cbd_sc |= BD_SC_WRAP;
fep->dirty_tx = bdp;
}
@ -510,10 +542,10 @@ fec_restart(struct net_device *ndev, int duplex)
writel(fep->bd_dma, fep->hwp + FEC_R_DES_START);
if (fep->bufdesc_ex)
writel((unsigned long)fep->bd_dma + sizeof(struct bufdesc_ex)
* RX_RING_SIZE, fep->hwp + FEC_X_DES_START);
* fep->rx_ring_size, fep->hwp + FEC_X_DES_START);
else
writel((unsigned long)fep->bd_dma + sizeof(struct bufdesc)
* RX_RING_SIZE, fep->hwp + FEC_X_DES_START);
* fep->rx_ring_size, fep->hwp + FEC_X_DES_START);
for (i = 0; i <= TX_RING_MOD_MASK; i++) {
@ -727,10 +759,7 @@ fec_enet_tx(struct net_device *ndev)
bdp = fep->dirty_tx;
/* get next bdp of dirty_tx */
if (bdp->cbd_sc & BD_ENET_TX_WRAP)
bdp = fep->tx_bd_base;
else
bdp = fec_enet_get_nextdesc(bdp, fep->bufdesc_ex);
bdp = fec_enet_get_nextdesc(bdp, fep);
while (((status = bdp->cbd_sc) & BD_ENET_TX_READY) == 0) {
@ -800,10 +829,7 @@ fec_enet_tx(struct net_device *ndev)
fep->dirty_tx = bdp;
/* Update pointer to next buffer descriptor to be transmitted */
if (status & BD_ENET_TX_WRAP)
bdp = fep->tx_bd_base;
else
bdp = fec_enet_get_nextdesc(bdp, fep->bufdesc_ex);
bdp = fec_enet_get_nextdesc(bdp, fep);
/* Since we have freed up a buffer, the ring is no longer full
*/
@ -993,10 +1019,8 @@ rx_processing_done:
}
/* Update BD pointer to next entry */
if (status & BD_ENET_RX_WRAP)
bdp = fep->rx_bd_base;
else
bdp = fec_enet_get_nextdesc(bdp, fep->bufdesc_ex);
bdp = fec_enet_get_nextdesc(bdp, fep);
/* Doing this here will keep the FEC running while we process
* incoming frames. On a heavily loaded network, we should be
* able to keep up at the expense of system resources.
@ -1662,7 +1686,7 @@ static void fec_enet_free_buffers(struct net_device *ndev)
struct bufdesc *bdp;
bdp = fep->rx_bd_base;
for (i = 0; i < RX_RING_SIZE; i++) {
for (i = 0; i < fep->rx_ring_size; i++) {
skb = fep->rx_skbuff[i];
if (bdp->cbd_bufaddr)
@ -1670,11 +1694,11 @@ static void fec_enet_free_buffers(struct net_device *ndev)
FEC_ENET_RX_FRSIZE, DMA_FROM_DEVICE);
if (skb)
dev_kfree_skb(skb);
bdp = fec_enet_get_nextdesc(bdp, fep->bufdesc_ex);
bdp = fec_enet_get_nextdesc(bdp, fep);
}
bdp = fep->tx_bd_base;
for (i = 0; i < TX_RING_SIZE; i++)
for (i = 0; i < fep->tx_ring_size; i++)
kfree(fep->tx_bounce[i]);
}
@ -1686,7 +1710,7 @@ static int fec_enet_alloc_buffers(struct net_device *ndev)
struct bufdesc *bdp;
bdp = fep->rx_bd_base;
for (i = 0; i < RX_RING_SIZE; i++) {
for (i = 0; i < fep->rx_ring_size; i++) {
skb = netdev_alloc_skb(ndev, FEC_ENET_RX_FRSIZE);
if (!skb) {
fec_enet_free_buffers(ndev);
@ -1703,15 +1727,15 @@ static int fec_enet_alloc_buffers(struct net_device *ndev)
ebdp->cbd_esc = BD_ENET_RX_INT;
}
bdp = fec_enet_get_nextdesc(bdp, fep->bufdesc_ex);
bdp = fec_enet_get_nextdesc(bdp, fep);
}
/* Set the last buffer to wrap. */
bdp = fec_enet_get_prevdesc(bdp, fep->bufdesc_ex);
bdp = fec_enet_get_prevdesc(bdp, fep);
bdp->cbd_sc |= BD_SC_WRAP;
bdp = fep->tx_bd_base;
for (i = 0; i < TX_RING_SIZE; i++) {
for (i = 0; i < fep->tx_ring_size; i++) {
fep->tx_bounce[i] = kmalloc(FEC_ENET_TX_FRSIZE, GFP_KERNEL);
bdp->cbd_sc = 0;
@ -1722,11 +1746,11 @@ static int fec_enet_alloc_buffers(struct net_device *ndev)
ebdp->cbd_esc = BD_ENET_TX_INT;
}
bdp = fec_enet_get_nextdesc(bdp, fep->bufdesc_ex);
bdp = fec_enet_get_nextdesc(bdp, fep);
}
/* Set the last buffer to wrap. */
bdp = fec_enet_get_prevdesc(bdp, fep->bufdesc_ex);
bdp = fec_enet_get_prevdesc(bdp, fep);
bdp->cbd_sc |= BD_SC_WRAP;
return 0;
@ -1966,13 +1990,17 @@ static int fec_enet_init(struct net_device *ndev)
/* Get the Ethernet address */
fec_get_mac(ndev);
/* init the tx & rx ring size */
fep->tx_ring_size = TX_RING_SIZE;
fep->rx_ring_size = RX_RING_SIZE;
/* Set receive and transmit descriptor base. */
fep->rx_bd_base = cbd_base;
if (fep->bufdesc_ex)
fep->tx_bd_base = (struct bufdesc *)
(((struct bufdesc_ex *)cbd_base) + RX_RING_SIZE);
(((struct bufdesc_ex *)cbd_base) + fep->rx_ring_size);
else
fep->tx_bd_base = cbd_base + RX_RING_SIZE;
fep->tx_bd_base = cbd_base + fep->rx_ring_size;
/* The FEC Ethernet specific entries in the device structure */
ndev->watchdog_timeo = TX_TIMEOUT;