Commit e18b7faa authored by David S. Miller's avatar David S. Miller

Merge branch 'bcmgenet'

Florian Fainelli says:

====================
net: bcmgenet: TX reclaim and DMA fixes

This patch set contains one fix for an accounting problem while reclaiming
transmitted buffers having fragments, and the second fix is to make sure
that the DMA shutdown is properly controlled.
====================
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parents a35165ca 4a0c081e
...@@ -875,6 +875,7 @@ static void __bcmgenet_tx_reclaim(struct net_device *dev, ...@@ -875,6 +875,7 @@ static void __bcmgenet_tx_reclaim(struct net_device *dev,
int last_tx_cn, last_c_index, num_tx_bds; int last_tx_cn, last_c_index, num_tx_bds;
struct enet_cb *tx_cb_ptr; struct enet_cb *tx_cb_ptr;
struct netdev_queue *txq; struct netdev_queue *txq;
unsigned int bds_compl;
unsigned int c_index; unsigned int c_index;
/* Compute how many buffers are transmitted since last xmit call */ /* Compute how many buffers are transmitted since last xmit call */
...@@ -899,7 +900,9 @@ static void __bcmgenet_tx_reclaim(struct net_device *dev, ...@@ -899,7 +900,9 @@ static void __bcmgenet_tx_reclaim(struct net_device *dev,
/* Reclaim transmitted buffers */ /* Reclaim transmitted buffers */
while (last_tx_cn-- > 0) { while (last_tx_cn-- > 0) {
tx_cb_ptr = ring->cbs + last_c_index; tx_cb_ptr = ring->cbs + last_c_index;
bds_compl = 0;
if (tx_cb_ptr->skb) { if (tx_cb_ptr->skb) {
bds_compl = skb_shinfo(tx_cb_ptr->skb)->nr_frags + 1;
dev->stats.tx_bytes += tx_cb_ptr->skb->len; dev->stats.tx_bytes += tx_cb_ptr->skb->len;
dma_unmap_single(&dev->dev, dma_unmap_single(&dev->dev,
dma_unmap_addr(tx_cb_ptr, dma_addr), dma_unmap_addr(tx_cb_ptr, dma_addr),
...@@ -916,7 +919,7 @@ static void __bcmgenet_tx_reclaim(struct net_device *dev, ...@@ -916,7 +919,7 @@ static void __bcmgenet_tx_reclaim(struct net_device *dev,
dma_unmap_addr_set(tx_cb_ptr, dma_addr, 0); dma_unmap_addr_set(tx_cb_ptr, dma_addr, 0);
} }
dev->stats.tx_packets++; dev->stats.tx_packets++;
ring->free_bds += 1; ring->free_bds += bds_compl;
last_c_index++; last_c_index++;
last_c_index &= (num_tx_bds - 1); last_c_index &= (num_tx_bds - 1);
...@@ -1741,13 +1744,63 @@ static void bcmgenet_init_multiq(struct net_device *dev) ...@@ -1741,13 +1744,63 @@ static void bcmgenet_init_multiq(struct net_device *dev)
bcmgenet_tdma_writel(priv, reg, DMA_CTRL); bcmgenet_tdma_writel(priv, reg, DMA_CTRL);
} }
static int bcmgenet_dma_teardown(struct bcmgenet_priv *priv)
{
int ret = 0;
int timeout = 0;
u32 reg;
/* Disable TDMA to stop add more frames in TX DMA */
reg = bcmgenet_tdma_readl(priv, DMA_CTRL);
reg &= ~DMA_EN;
bcmgenet_tdma_writel(priv, reg, DMA_CTRL);
/* Check TDMA status register to confirm TDMA is disabled */
while (timeout++ < DMA_TIMEOUT_VAL) {
reg = bcmgenet_tdma_readl(priv, DMA_STATUS);
if (reg & DMA_DISABLED)
break;
udelay(1);
}
if (timeout == DMA_TIMEOUT_VAL) {
netdev_warn(priv->dev, "Timed out while disabling TX DMA\n");
ret = -ETIMEDOUT;
}
/* Wait 10ms for packet drain in both tx and rx dma */
usleep_range(10000, 20000);
/* Disable RDMA */
reg = bcmgenet_rdma_readl(priv, DMA_CTRL);
reg &= ~DMA_EN;
bcmgenet_rdma_writel(priv, reg, DMA_CTRL);
timeout = 0;
/* Check RDMA status register to confirm RDMA is disabled */
while (timeout++ < DMA_TIMEOUT_VAL) {
reg = bcmgenet_rdma_readl(priv, DMA_STATUS);
if (reg & DMA_DISABLED)
break;
udelay(1);
}
if (timeout == DMA_TIMEOUT_VAL) {
netdev_warn(priv->dev, "Timed out while disabling RX DMA\n");
ret = -ETIMEDOUT;
}
return ret;
}
static void bcmgenet_fini_dma(struct bcmgenet_priv *priv) static void bcmgenet_fini_dma(struct bcmgenet_priv *priv)
{ {
int i; int i;
/* disable DMA */ /* disable DMA */
bcmgenet_rdma_writel(priv, 0, DMA_CTRL); bcmgenet_dma_teardown(priv);
bcmgenet_tdma_writel(priv, 0, DMA_CTRL);
for (i = 0; i < priv->num_tx_bds; i++) { for (i = 0; i < priv->num_tx_bds; i++) {
if (priv->tx_cbs[i].skb != NULL) { if (priv->tx_cbs[i].skb != NULL) {
...@@ -2106,57 +2159,6 @@ static int bcmgenet_open(struct net_device *dev) ...@@ -2106,57 +2159,6 @@ static int bcmgenet_open(struct net_device *dev)
return ret; return ret;
} }
static int bcmgenet_dma_teardown(struct bcmgenet_priv *priv)
{
int ret = 0;
int timeout = 0;
u32 reg;
/* Disable TDMA to stop add more frames in TX DMA */
reg = bcmgenet_tdma_readl(priv, DMA_CTRL);
reg &= ~DMA_EN;
bcmgenet_tdma_writel(priv, reg, DMA_CTRL);
/* Check TDMA status register to confirm TDMA is disabled */
while (timeout++ < DMA_TIMEOUT_VAL) {
reg = bcmgenet_tdma_readl(priv, DMA_STATUS);
if (reg & DMA_DISABLED)
break;
udelay(1);
}
if (timeout == DMA_TIMEOUT_VAL) {
netdev_warn(priv->dev, "Timed out while disabling TX DMA\n");
ret = -ETIMEDOUT;
}
/* Wait 10ms for packet drain in both tx and rx dma */
usleep_range(10000, 20000);
/* Disable RDMA */
reg = bcmgenet_rdma_readl(priv, DMA_CTRL);
reg &= ~DMA_EN;
bcmgenet_rdma_writel(priv, reg, DMA_CTRL);
timeout = 0;
/* Check RDMA status register to confirm RDMA is disabled */
while (timeout++ < DMA_TIMEOUT_VAL) {
reg = bcmgenet_rdma_readl(priv, DMA_STATUS);
if (reg & DMA_DISABLED)
break;
udelay(1);
}
if (timeout == DMA_TIMEOUT_VAL) {
netdev_warn(priv->dev, "Timed out while disabling RX DMA\n");
ret = -ETIMEDOUT;
}
return ret;
}
static void bcmgenet_netif_stop(struct net_device *dev) static void bcmgenet_netif_stop(struct net_device *dev)
{ {
struct bcmgenet_priv *priv = netdev_priv(dev); struct bcmgenet_priv *priv = netdev_priv(dev);
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment