korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-23 12:14:10 +08:00
Code Issues Packages Projects Releases Wiki Activity

net: ftgmac100: Ensure tx descriptor updates are visible

Browse Source 
The driver must ensure TX descriptor updates are visible
before updating TX pointer and TX clear pointer.

This resolves TX hangs observed on AST2600 when running
iperf3.

Signed-off-by: Jacky Chou <jacky_chou@aspeedtech.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jacky Chou 2024-08-22 15:30:06 +08:00 committed by David S. Miller
parent 8af174ea86
commit 4186c8d9e6
1 changed files with 18 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
drivers/net/ethernet/faraday/ftgmac100.c
View File

@ -572,7 +572,7 @@ static bool ftgmac100_rx_packet(struct ftgmac100 *priv, int *processed)
(*processed)++;
return true;
drop:
drop:
/* Clean rxdes0 (which resets own bit) */
rxdes->rxdes0 = cpu_to_le32(status & priv->rxdes0_edorr_mask);
priv->rx_pointer = ftgmac100_next_rx_pointer(priv, pointer);
@ -656,6 +656,11 @@ static bool ftgmac100_tx_complete_packet(struct ftgmac100 *priv)
ftgmac100_free_tx_packet(priv, pointer, skb, txdes, ctl_stat);
txdes->txdes0 = cpu_to_le32(ctl_stat & priv->txdes0_edotr_mask);
/* Ensure the descriptor config is visible before setting the tx
* pointer.
*/
smp_wmb();
priv->tx_clean_pointer = ftgmac100_next_tx_pointer(priv, pointer);
return true;
@ -809,6 +814,11 @@ static netdev_tx_t ftgmac100_hard_start_xmit(struct sk_buff *skb,
dma_wmb();
first->txdes0 = cpu_to_le32(f_ctl_stat);
/* Ensure the descriptor config is visible before setting the tx
* pointer.
*/
smp_wmb();
/* Update next TX pointer */
priv->tx_pointer = pointer;
@ -829,7 +839,7 @@ static netdev_tx_t ftgmac100_hard_start_xmit(struct sk_buff *skb,
return NETDEV_TX_OK;
dma_err:
dma_err:
if (net_ratelimit())
netdev_err(netdev, "map tx fragment failed\n");
@ -851,7 +861,7 @@ static netdev_tx_t ftgmac100_hard_start_xmit(struct sk_buff *skb,
* last fragment, so we know ftgmac100_free_tx_packet()
* hasn't freed the skb yet.
*/
drop:
drop:
/* Drop the packet */
dev_kfree_skb_any(skb);
netdev->stats.tx_dropped++;
@ -1344,7 +1354,7 @@ static void ftgmac100_reset(struct ftgmac100 *priv)
ftgmac100_init_all(priv, true);
netdev_dbg(netdev, "Reset done !\n");
bail:
bail:
if (priv->mii_bus)
mutex_unlock(&priv->mii_bus->mdio_lock);
if (netdev->phydev)
@ -1543,15 +1553,15 @@ static int ftgmac100_open(struct net_device *netdev)
return 0;
err_ncsi:
err_ncsi:
napi_disable(&priv->napi);
netif_stop_queue(netdev);
err_alloc:
err_alloc:
ftgmac100_free_buffers(priv);
free_irq(netdev->irq, netdev);
err_irq:
err_irq:
netif_napi_del(&priv->napi);
err_hw:
err_hw:
iowrite32(0, priv->base + FTGMAC100_OFFSET_IER);
ftgmac100_free_rings(priv);
return err;