* [PATCH AUTOSEL 4.14 13/13] net: ll_temac: Avoid ndo_start_xmit returning NETDEV_TX_BUSY
[not found] <20210621175519.736255-1-sashal@kernel.org>
@ 2021-06-21 17:55 ` Sasha Levin
0 siblings, 0 replies; only message in thread
From: Sasha Levin @ 2021-06-21 17:55 UTC (permalink / raw)
To: linux-kernel, stable
Cc: Esben Haabendal, David S . Miller, Sasha Levin, netdev, linux-arm-kernel
From: Esben Haabendal <esben@geanix.com>
[ Upstream commit f6396341194234e9b01cd7538bc2c6ac4501ab14 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/xilinx/ll_temac_main.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/net/ethernet/xilinx/ll_temac_main.c b/drivers/net/ethernet/xilinx/ll_temac_main.c
index 2241f9897092..939de185bc6b 100644
--- a/drivers/net/ethernet/xilinx/ll_temac_main.c
+++ b/drivers/net/ethernet/xilinx/ll_temac_main.c
@@ -736,6 +736,11 @@ temac_start_xmit(struct sk_buff *skb, struct net_device *ndev)
/* Kick off the transfer */
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;
}
--
2.30.2
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