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net: ll_temac: Avoid ndo_start_xmit returning NETDEV_TX_BUSY 

As documented in Documentation/networking/driver.rst, the ndo_start_xmit
method must not return NETDEV_TX_BUSY under any normal circumstances, and
as recommended, we simply stop the tx queue in advance, when there is a
risk that the next xmit would cause a NETDEV_TX_BUSY return.

Signed-off-by: Esben Haabendal <esben@geanix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Esben Haabendal 2021-06-18 12:52:38 +02:00 committed by David S. Miller
parent c364df2489
commit f639634119
1 changed files with 5 additions and 0 deletions
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5
drivers/net/ethernet/xilinx/ll_temac_main.c
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@ -942,6 +942,11 @@ temac_start_xmit(struct sk_buff *skb, struct net_device *ndev)
wmb(); wmb();
lp->dma_out(lp, TX_TAILDESC_PTR, tail_p); /* DMA start */ lp->dma_out(lp, TX_TAILDESC_PTR, tail_p); /* DMA start */
if (temac_check_tx_bd_space(lp, MAX_SKB_FRAGS + 1)) {
netdev_info(ndev, "%s -> netif_stop_queue\n", __func__);
netif_stop_queue(ndev);
}
return NETDEV_TX_OK; return NETDEV_TX_OK;
} }