[PATCH 5.0 08/43] net: hns3: add dma_rmb() for rx description

From: Greg Kroah-Hartman
Date: Mon Mar 18 2019 - 05:46:46 EST

5.0-stable review patch. If anyone has any objections, please let me know.


From: Jian Shen <shenjian15@xxxxxxxxxx>

[ Upstream commit d394d33bee22421b39a0bcdc51ca6d68ba308625 ]

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@xxxxxxxxxx>
Signed-off-by: Huazhong Tan <tanhuazhong@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
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
@@ -2476,6 +2476,8 @@ 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 (!hnae3_get_bit(bd_base_info, HNS3_RXD_VLD_B))
return -ENXIO;