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net: hns3: fix the descriptor index when get rss type

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Driver gets rss information from the last descriptor of the packet.
When driver handle the rss type, ring->next_to_clean indicates the
first descriptor of next packet.

This patch fix the descriptor index with "ring->next_to_clean - 1".

Fixes: 232fc64b6e62 ("net: hns3: Add HW RSS hash information to RX skb")
Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Peng Li 2018-12-20 11:52:05 +08:00 committed by David S. Miller
parent 8edc2285b7
commit 31a16f99e0
1 changed files with 8 additions and 1 deletions
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9
drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
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@ -2550,9 +2550,16 @@ static void hns3_set_gro_param(struct sk_buff *skb, u32 l234info,
static void hns3_set_rx_skb_rss_type(struct hns3_enet_ring *ring,
struct sk_buff *skb)
{
struct hns3_desc *desc = &ring->desc[ring->next_to_clean];
struct hnae3_handle *handle = ring->tqp->handle;
enum pkt_hash_types rss_type;
struct hns3_desc *desc;
int last_bd;
/* When driver handle the rss type, ring->next_to_clean indicates the
* first descriptor of next packet, need -1 here.
*/
last_bd = (ring->next_to_clean - 1 + ring->desc_num) % ring->desc_num;
desc = &ring->desc[last_bd];
if (le32_to_cpu(desc->rx.rss_hash))
rss_type = handle->kinfo.rss_type;