net: hns3: fix for not calculating tx bd num correctly

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When there is only one byte in a frag, the current calculation
using "(size + HNS3_MAX_BD_SIZE - 1) >> HNS3_MAX_BD_SIZE_OFFSET"
will return zero, because HNS3_MAX_BD_SIZE is 65535 and
HNS3_MAX_BD_SIZE_OFFSET is 16. So it will cause tx error when
a frag's size is one byte.

This patch fixes it by using DIV_ROUND_UP.

Fixes: 3fe13ed95d ("net: hns3: avoid mult + div op in critical data path")
Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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This commit is contained in:

Yunsheng Lin 2019-03-21 11:28:43 +08:00 • committed by David S. Miller

parent 408f13ef35

commit 5f543a54ee

2 changed files with 6 additions and 8 deletions

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13

drivers/net/ethernet/hisilicon/hns3/hns3_enet.c

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1

drivers/net/ethernet/hisilicon/hns3/hns3_enet.h

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