From: Yunsheng Lin <linyunsh...@huawei.com>
[ Upstream commit 8ceca59fb3ed48a693171bd571c4fcbd555b7f1f ]
The content of the TX desc is automatically cleared by the HW
when the HW has sent out the packet to the wire. When desc filling
fails in hns3_nic_net_xmit(), it will call hns3_clear_desc() to do
the error handling, which miss zeroing of the TX desc and the
checking if a unmapping is needed.
So add the zeroing and checking in hns3_clear_desc() to avoid the
above problem. Also add DESC_TYPE_UNKNOWN to indicate the info in
desc_cb is not valid, because hns3_nic_reclaim_desc() may treat
the desc_cb->type of zero as packet and add to the sent pkt
statistics accordingly.
Fixes: 76ad4f0ee747 ("net: hns3: Add support of HNS3 Ethernet Driver for hip08
SoC")
Signed-off-by: Yunsheng Lin <linyunsh...@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazh...@huawei.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
drivers/net/ethernet/hisilicon/hns3/hnae3.h | 1 +
drivers/net/ethernet/hisilicon/hns3/hns3_enet.c | 8 ++++++++
2 files changed, 9 insertions(+)
diff --git a/drivers/net/ethernet/hisilicon/hns3/hnae3.h
b/drivers/net/ethernet/hisilicon/hns3/hnae3.h
index 5587605d6deb2..cc45662f77f04 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hnae3.h
+++ b/drivers/net/ethernet/hisilicon/hns3/hnae3.h
@@ -77,6 +77,7 @@
((ring)->p = ((ring)->p - 1 + (ring)->desc_num) % (ring)->desc_num)
enum hns_desc_type {
+ DESC_TYPE_UNKNOWN,
DESC_TYPE_SKB,
DESC_TYPE_FRAGLIST_SKB,
DESC_TYPE_PAGE,
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
index 5dab84aa3afd5..df1cb0441183c 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -1351,6 +1351,10 @@ static void hns3_clear_desc(struct hns3_enet_ring *ring,
int next_to_use_orig)
unsigned int i;
for (i = 0; i < ring->desc_num; i++) {
+ struct hns3_desc *desc = &ring->desc[ring->next_to_use];
+
+ memset(desc, 0, sizeof(*desc));
+
/* check if this is where we started */
if (ring->next_to_use == next_to_use_orig)
break;
@@ -1358,6 +1362,9 @@ static void hns3_clear_desc(struct hns3_enet_ring *ring,
int next_to_use_orig)
/* rollback one */
ring_ptr_move_bw(ring, next_to_use);
+ if (!ring->desc_cb[ring->next_to_use].dma)
+ continue;
+
/* unmap the descriptor dma address */
if (ring->desc_cb[ring->next_to_use].type == DESC_TYPE_SKB ||
ring->desc_cb[ring->next_to_use].type ==
@@ -1374,6 +1381,7 @@ static void hns3_clear_desc(struct hns3_enet_ring *ring,
int next_to_use_orig)
ring->desc_cb[ring->next_to_use].length = 0;
ring->desc_cb[ring->next_to_use].dma = 0;
+ ring->desc_cb[ring->next_to_use].type = DESC_TYPE_UNKNOWN;
}
}
--
2.25.1
