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Message-ID: <1378121735-5681-1-git-send-email-B38611@freescale.com>
Date: Mon, 2 Sep 2013 19:35:35 +0800
From: Fugang Duan <B38611@...escale.com>
To: <b20596@...escale.com>, <davem@...emloft.net>
CC: <netdev@...r.kernel.org>, <bhutchings@...arflare.com>,
<stephen@...workplumber.org>
Subject: [PATCH] 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.
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.
Signed-off-by: Fugang Duan <B38611@...escale.com>
---
drivers/net/ethernet/freescale/fec.h | 3 +
drivers/net/ethernet/freescale/fec_main.c | 94 +++++++++++++++-------------
2 files changed, 53 insertions(+), 44 deletions(-)
diff --git a/drivers/net/ethernet/freescale/fec.h b/drivers/net/ethernet/freescale/fec.h
index ae23600..0120217 100644
--- a/drivers/net/ethernet/freescale/fec.h
+++ b/drivers/net/ethernet/freescale/fec.h
@@ -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;
diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 4ea1555..9894dd3 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -239,22 +239,35 @@ 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 *next_bd(struct bufdesc *bdp, struct bufdesc *base,
+ int ring_size, int is_ex)
{
- struct bufdesc_ex *ex = (struct bufdesc_ex *)bdp;
+ struct bufdesc *new_bd = bdp + 1;
+ struct bufdesc_ex *ex_new_bd = (struct bufdesc_ex *)bdp + 1;
+ struct bufdesc_ex *ex_base = (struct bufdesc_ex *)base;
+
if (is_ex)
- return (struct bufdesc *)(ex + 1);
+ return (struct bufdesc *)((ex_new_bd >= (ex_base + ring_size)) ?
+ (ex_new_bd - ring_size) : ex_new_bd);
else
- return bdp + 1;
+ return (new_bd >= (base + ring_size)) ?
+ (new_bd - ring_size) : new_bd;
}
-static struct bufdesc *fec_enet_get_prevdesc(struct bufdesc *bdp, int is_ex)
+static inline
+struct bufdesc *pre_bd(struct bufdesc *bdp, struct bufdesc *base,
+ int ring_size, int is_ex)
{
- struct bufdesc_ex *ex = (struct bufdesc_ex *)bdp;
+ struct bufdesc *new_bd = bdp - 1;
+ struct bufdesc_ex *ex_new_bd = (struct bufdesc_ex *)bdp - 1;
+ struct bufdesc_ex *ex_base = (struct bufdesc_ex *)base;
+
if (is_ex)
- return (struct bufdesc *)(ex - 1);
+ 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 +393,7 @@ fec_enet_start_xmit(struct sk_buff *skb, struct net_device *ndev)
}
}
- bdp_pre = fec_enet_get_prevdesc(bdp, fep->bufdesc_ex);
+ bdp_pre = pre_bd(bdp, fep->tx_bd_base, fep->tx_ring_size, fep->bufdesc_ex);
if ((id_entry->driver_data & FEC_QUIRK_ERR006358) &&
!(bdp_pre->cbd_sc & BD_ENET_TX_READY)) {
fep->delay_work.trig_tx = true;
@@ -389,10 +402,7 @@ 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 = next_bd(bdp, fep->tx_bd_base, fep->tx_ring_size, fep->bufdesc_ex);
fep->cur_tx = bdp;
@@ -417,18 +427,18 @@ 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 = next_bd(bdp, fep->rx_bd_base, fep->rx_ring_size, fep->bufdesc_ex);
}
/* Set the last buffer to wrap */
- bdp = fec_enet_get_prevdesc(bdp, fep->bufdesc_ex);
+ bdp = pre_bd(bdp, fep->rx_bd_base, fep->rx_ring_size, fep->bufdesc_ex);
bdp->cbd_sc |= BD_SC_WRAP;
fep->cur_rx = fep->rx_bd_base;
@@ -436,7 +446,7 @@ 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 +455,11 @@ 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 = next_bd(bdp, fep->tx_bd_base, fep->tx_ring_size, fep->bufdesc_ex);
}
/* Set the last buffer to wrap */
- bdp = fec_enet_get_prevdesc(bdp, fep->bufdesc_ex);
+ bdp = pre_bd(bdp, fep->tx_bd_base, fep->tx_ring_size, fep->bufdesc_ex);
bdp->cbd_sc |= BD_SC_WRAP;
fep->dirty_tx = bdp;
}
@@ -510,10 +520,10 @@ 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 +737,7 @@ 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 = next_bd(bdp, fep->tx_bd_base, fep->tx_ring_size, fep->bufdesc_ex);
while (((status = bdp->cbd_sc) & BD_ENET_TX_READY) == 0) {
@@ -800,10 +807,7 @@ 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 = next_bd(bdp, fep->tx_bd_base, fep->tx_ring_size, fep->bufdesc_ex);
/* Since we have freed up a buffer, the ring is no longer full
*/
@@ -994,10 +998,8 @@ 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 = next_bd(bdp, fep->rx_bd_base, fep->rx_ring_size, fep->bufdesc_ex);
+
/* 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.
@@ -1663,7 +1665,7 @@ 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)
@@ -1671,11 +1673,11 @@ 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 = next_bd(bdp, fep->rx_bd_base, fep->rx_ring_size, fep->bufdesc_ex);
}
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]);
}
@@ -1687,7 +1689,7 @@ 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);
@@ -1704,15 +1706,15 @@ 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 = next_bd(bdp, fep->rx_bd_base, fep->rx_ring_size, fep->bufdesc_ex);
}
/* Set the last buffer to wrap. */
- bdp = fec_enet_get_prevdesc(bdp, fep->bufdesc_ex);
+ bdp = pre_bd(bdp, fep->rx_bd_base, fep->rx_ring_size, fep->bufdesc_ex);
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;
@@ -1723,11 +1725,11 @@ 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 = next_bd(bdp, fep->tx_bd_base, fep->tx_ring_size, fep->bufdesc_ex);
}
/* Set the last buffer to wrap. */
- bdp = fec_enet_get_prevdesc(bdp, fep->bufdesc_ex);
+ bdp = pre_bd(bdp, fep->tx_bd_base, fep->tx_ring_size, fep->bufdesc_ex);
bdp->cbd_sc |= BD_SC_WRAP;
return 0;
@@ -1967,13 +1969,17 @@ 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;
--
1.7.1
--
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