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net: hns3: pad the short frame before sending to the hardware

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[ Upstream commit 36c67349a1a1c88b9cf11d7ca7762ababdb38867 ]

The hardware can not handle short frames below or equal to 32
bytes according to the hardware user manual, and it will trigger
a RAS error when the frame's length is below 33 bytes.

This patch pads the SKB when skb->len is below 33 bytes before
sending it to hardware.

Fixes: 76ad4f0ee7 ("net: hns3: Add support of HNS3 Ethernet Driver for hip08 SoC")
Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Yunsheng Lin 2020-01-15 10:46:45 +08:00 • committed by Greg Kroah-Hartman
commit 284678e237
1 changed files with 6 additions and 0 deletions
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6
drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
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@ -54,6 +54,8 @@ MODULE_PARM_DESC(debug, " Network interface message level setting");
#define HNS3_INNER_VLAN_TAG 1
#define HNS3_OUTER_VLAN_TAG 2
#define HNS3_MIN_TX_LEN 33U
/* hns3_pci_tbl - PCI Device ID Table
*
* Last entry must be all 0s
@ -1329,6 +1331,10 @@ netdev_tx_t hns3_nic_net_xmit(struct sk_buff *skb, struct net_device *netdev)
int ret;
int i;
/* Hardware can only handle short frames above 32 bytes */
if (skb_put_padto(skb, HNS3_MIN_TX_LEN))
return NETDEV_TX_OK;
/* Prefetch the data used later */
prefetch(skb->data);