From: Jian Shen <shenjian15@huawei.com>
Date: Wed, 6 Mar 2019 11:26:37 +0800
Subject: net: hns3: add dma_rmb() for rx description
Patch-mainline: v5.1-rc1
Git-commit: d394d33bee22421b39a0bcdc51ca6d68ba308625
References: bsc#1104353 FATE#326415
HW can not guarantee complete write desc->rx.size, even though
HNS3_RXD_VLD_B has been set. Driver needs to add dma_rmb()
instruction to make sure desc->rx.size is always valid.
Fixes: e55970950556 ("net: hns3: Add handling of GRO Pkts not fully RX'ed in NAPI poll")
Signed-off-by: Jian Shen <shenjian15@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/net/ethernet/hisilicon/hns3/hns3_enet.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -2473,6 +2473,8 @@ static int hns3_add_frag(struct hns3_ene
desc = &ring->desc[ring->next_to_clean];
desc_cb = &ring->desc_cb[ring->next_to_clean];
bd_base_info = le32_to_cpu(desc->rx.bd_base_info);
+ /* make sure HW write desc complete */
+ dma_rmb();
if (!(bd_base_info & BIT(HNS3_RXD_VLD_B)))
return -ENXIO;