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net: ftgmac100: Ensure tx descriptor updates are visible

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[ Upstream commit 4186c8d9e6 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jacky Chou 2024-08-22 15:30:06 +08:00 committed by Greg Kroah-Hartman
parent 001eaeaac7
commit d44cfa992b
1 changed files with 18 additions and 8 deletions
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10
drivers/net/ethernet/faraday/ftgmac100.c
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@ -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;