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net: hns3: fix error handling for desc filling

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[ 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: 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: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yunsheng Lin 2020-07-21 19:03:53 +08:00 • committed by Greg Kroah-Hartman
commit 4997b311c0
2 changed files with 9 additions and 0 deletions
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1
drivers/net/ethernet/hisilicon/hns3/hnae3.h
View file

@ -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_PAGE,
};

8
drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
View file

@ -1292,6 +1292,10 @@ 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;
@ -1299,6 +1303,9 @@ 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)
dma_unmap_single(dev,
@ -1313,6 +1320,7 @@ 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;
}
}