diff options
| author | Yunsheng Lin <linyunsheng@huawei.com> | 2019-02-23 17:22:09 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-02-24 20:27:50 -0800 |
| commit | 3fe13ed95dd3c4aede3313a2dd2d589c207b51d0 (patch) | |
| tree | 6bb9e7f4f133e2b47bfa76ac67a08a0095a5b9b7 /drivers/net/ethernet/hisilicon/hns3/hns3_enet.c | |
| parent | 2a73ac3e6c9d7cd80af731bcb699c180d95c8166 (diff) | |
net: hns3: avoid mult + div op in critical data path
This patch uses shift offset to avoid doing mult and div operation.
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>
Diffstat (limited to 'drivers/net/ethernet/hisilicon/hns3/hns3_enet.c')
| -rw-r--r-- | drivers/net/ethernet/hisilicon/hns3/hns3_enet.c | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c index d75977c5d4a3..14c3aa74c92b 100644 --- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c +++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c @@ -658,7 +658,7 @@ static int hns3_set_tso(struct sk_buff *skb, u32 *paylen, /* normal or tunnel packet*/ l4_offset = l4.hdr - skb->data; - hdr_len = (l4.tcp->doff * 4) + l4_offset; + hdr_len = (l4.tcp->doff << 2) + l4_offset; /* remove payload length from inner pseudo checksum when tso*/ l4_paylen = skb->len - l4_offset; @@ -1100,8 +1100,8 @@ static int hns3_fill_desc(struct hns3_enet_ring *ring, void *priv, desc_cb->length = size; - frag_buf_num = (size + HNS3_MAX_BD_SIZE - 1) / HNS3_MAX_BD_SIZE; - sizeoflast = size % HNS3_MAX_BD_SIZE; + frag_buf_num = (size + HNS3_MAX_BD_SIZE - 1) >> HNS3_MAX_BD_SIZE_OFFSET; + sizeoflast = size & HNS3_TX_LAST_SIZE_M; sizeoflast = sizeoflast ? sizeoflast : HNS3_MAX_BD_SIZE; /* When frag size is bigger than hardware limit, split this frag */ @@ -1145,14 +1145,14 @@ static int hns3_nic_maybe_stop_tso(struct sk_buff **out_skb, int *bnum, int i; size = skb_headlen(skb); - buf_num = (size + HNS3_MAX_BD_SIZE - 1) / HNS3_MAX_BD_SIZE; + buf_num = (size + HNS3_MAX_BD_SIZE - 1) >> HNS3_MAX_BD_SIZE_OFFSET; frag_num = skb_shinfo(skb)->nr_frags; for (i = 0; i < frag_num; i++) { frag = &skb_shinfo(skb)->frags[i]; size = skb_frag_size(frag); - bdnum_for_frag = - (size + HNS3_MAX_BD_SIZE - 1) / HNS3_MAX_BD_SIZE; + bdnum_for_frag = (size + HNS3_MAX_BD_SIZE - 1) >> + HNS3_MAX_BD_SIZE_OFFSET; if (bdnum_for_frag > HNS3_MAX_BD_PER_FRAG) return -ENOMEM; @@ -1160,7 +1160,8 @@ static int hns3_nic_maybe_stop_tso(struct sk_buff **out_skb, int *bnum, } if (unlikely(buf_num > HNS3_MAX_BD_PER_FRAG)) { - buf_num = (skb->len + HNS3_MAX_BD_SIZE - 1) / HNS3_MAX_BD_SIZE; + buf_num = (skb->len + HNS3_MAX_BD_SIZE - 1) >> + HNS3_MAX_BD_SIZE_OFFSET; if (ring_space(ring) < buf_num) return -EBUSY; /* manual split the send packet */ |