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>
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@ -658,7 +658,7 @@ static int hns3_set_tso(struct sk_buff *skb, u32 *paylen,
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/* normal or tunnel packet*/
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l4_offset = l4.hdr - skb->data;
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hdr_len = (l4.tcp->doff * 4) + l4_offset;
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hdr_len = (l4.tcp->doff << 2) + l4_offset;
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/* remove payload length from inner pseudo checksum when tso*/
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l4_paylen = skb->len - l4_offset;
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@ -1100,8 +1100,8 @@ static int hns3_fill_desc(struct hns3_enet_ring *ring, void *priv,
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desc_cb->length = size;
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frag_buf_num = (size + HNS3_MAX_BD_SIZE - 1) / HNS3_MAX_BD_SIZE;
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sizeoflast = size % HNS3_MAX_BD_SIZE;
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frag_buf_num = (size + HNS3_MAX_BD_SIZE - 1) >> HNS3_MAX_BD_SIZE_OFFSET;
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sizeoflast = size & HNS3_TX_LAST_SIZE_M;
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sizeoflast = sizeoflast ? sizeoflast : HNS3_MAX_BD_SIZE;
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/* When frag size is bigger than hardware limit, split this frag */
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@ -1145,14 +1145,14 @@ static int hns3_nic_maybe_stop_tso(struct sk_buff **out_skb, int *bnum,
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int i;
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size = skb_headlen(skb);
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buf_num = (size + HNS3_MAX_BD_SIZE - 1) / HNS3_MAX_BD_SIZE;
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buf_num = (size + HNS3_MAX_BD_SIZE - 1) >> HNS3_MAX_BD_SIZE_OFFSET;
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frag_num = skb_shinfo(skb)->nr_frags;
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for (i = 0; i < frag_num; i++) {
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frag = &skb_shinfo(skb)->frags[i];
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size = skb_frag_size(frag);
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bdnum_for_frag =
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(size + HNS3_MAX_BD_SIZE - 1) / HNS3_MAX_BD_SIZE;
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bdnum_for_frag = (size + HNS3_MAX_BD_SIZE - 1) >>
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HNS3_MAX_BD_SIZE_OFFSET;
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if (bdnum_for_frag > HNS3_MAX_BD_PER_FRAG)
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return -ENOMEM;
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@ -1160,7 +1160,8 @@ static int hns3_nic_maybe_stop_tso(struct sk_buff **out_skb, int *bnum,
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}
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if (unlikely(buf_num > HNS3_MAX_BD_PER_FRAG)) {
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buf_num = (skb->len + HNS3_MAX_BD_SIZE - 1) / HNS3_MAX_BD_SIZE;
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buf_num = (skb->len + HNS3_MAX_BD_SIZE - 1) >>
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HNS3_MAX_BD_SIZE_OFFSET;
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if (ring_space(ring) < buf_num)
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return -EBUSY;
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/* manual split the send packet */
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@ -184,6 +184,8 @@ enum hns3_nic_state {
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#define HNS3_TXD_MSS_S 0
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#define HNS3_TXD_MSS_M (0x3fff << HNS3_TXD_MSS_S)
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#define HNS3_TX_LAST_SIZE_M 0xffff
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#define HNS3_VECTOR_TX_IRQ BIT_ULL(0)
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#define HNS3_VECTOR_RX_IRQ BIT_ULL(1)
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@ -191,6 +193,7 @@ enum hns3_nic_state {
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#define HNS3_VECTOR_INITED 1
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#define HNS3_MAX_BD_SIZE 65535
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#define HNS3_MAX_BD_SIZE_OFFSET 16
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#define HNS3_MAX_BD_PER_FRAG 8
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#define HNS3_MAX_BD_PER_PKT MAX_SKB_FRAGS
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