From: Esben Haabendal <esben@geanix.com>
To: netdev@vger.kernel.org
Cc: "David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Michal Simek <michal.simek@xilinx.com>,
Zhang Changzhong <zhangchangzhong@huawei.com>,
Andrew Lunn <andrew@lunn.ch>, Michael Walle <michael@walle.cc>,
Wang Hai <wanghai38@huawei.com>,
Jesse Brandeburg <jesse.brandeburg@intel.com>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: [PATCH 4/4] net: ll_temac: Avoid ndo_start_xmit returning NETDEV_TX_BUSY
Date: Fri, 18 Jun 2021 12:52:38 +0200 [thread overview]
Message-ID: <4c927f4c3da854dc60145d170008a2a09ab25027.1624013456.git.esben@geanix.com> (raw)
In-Reply-To: <d9200a5023973fbe372a2d51dc4e500400450ecd.1624013456.git.esben@geanix.com>
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>
---
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 cc482ee36501..9a13953ea70f 100644
--- a/drivers/net/ethernet/xilinx/ll_temac_main.c
+++ b/drivers/net/ethernet/xilinx/ll_temac_main.c
@@ -942,6 +942,11 @@ temac_start_xmit(struct sk_buff *skb, struct net_device *ndev)
wmb();
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;
}
--
2.32.0
next prev parent reply other threads:[~2021-06-18 10:53 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-18 10:52 [PATCH 1/4] net: ll_temac: Make sure to free skb when it is completely used Esben Haabendal
2021-06-18 10:52 ` [PATCH 2/4] net: ll_temac: Add memory-barriers for TX BD access Esben Haabendal
2021-06-18 10:52 ` [PATCH 3/4] net: ll_temac: Fix TX BD buffer overwrite Esben Haabendal
2021-06-18 10:52 ` Esben Haabendal [this message]
2021-06-18 19:20 ` [PATCH 1/4] net: ll_temac: Make sure to free skb when it is completely used patchwork-bot+netdevbpf
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