net: hns3: minor optimization for datapath

This patch adds a likely case for hns3_fill_desc and
limits the local variables' scope as much as possible,
also avoid div operation when the tqp_vector->num_tqps
is one.

Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
index 21085c4..5b34d2e 100644 (file)
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -1012,7 +1012,6 @@ static int hns3_fill_desc(struct hns3_enet_ring *ring, void *priv,
        struct hns3_desc_cb *desc_cb = &ring->desc_cb[ring->next_to_use];
        struct hns3_desc *desc = &ring->desc[ring->next_to_use];
        struct device *dev = ring_to_dev(ring);
-       u16 bdtp_fe_sc_vld_ra_ri = 0;
        struct skb_frag_struct *frag;
        unsigned int frag_buf_num;
        int k, sizeoflast;
@@ -1080,12 +1079,30 @@ static int hns3_fill_desc(struct hns3_enet_ring *ring, void *priv,
 
        desc_cb->length = size;
 
+       if (likely(size <= HNS3_MAX_BD_SIZE)) {
+               u16 bdtp_fe_sc_vld_ra_ri = 0;
+
+               desc_cb->priv = priv;
+               desc_cb->dma = dma;
+               desc_cb->type = type;
+               desc->addr = cpu_to_le64(dma);
+               desc->tx.send_size = cpu_to_le16(size);
+               hns3_set_txbd_baseinfo(&bdtp_fe_sc_vld_ra_ri, frag_end);
+               desc->tx.bdtp_fe_sc_vld_ra_ri =
+                       cpu_to_le16(bdtp_fe_sc_vld_ra_ri);
+
+               ring_ptr_move_fw(ring, next_to_use);
+               return 0;
+       }
+
        frag_buf_num = hns3_tx_bd_count(size);
        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 */
        for (k = 0; k < frag_buf_num; k++) {
+               u16 bdtp_fe_sc_vld_ra_ri = 0;
+
                /* The txbd's baseinfo of DESC_TYPE_PAGE & DESC_TYPE_SKB */
                desc_cb->priv = priv;
                desc_cb->dma = dma + HNS3_MAX_BD_SIZE * k;
@@ -2891,7 +2908,7 @@ static int hns3_nic_common_poll(struct napi_struct *napi, int budget)
        struct hns3_enet_tqp_vector *tqp_vector =
                container_of(napi, struct hns3_enet_tqp_vector, napi);
        bool clean_complete = true;
-       int rx_budget;
+       int rx_budget = budget;
 
        if (unlikely(test_bit(HNS3_NIC_STATE_DOWN, &priv->state))) {
                napi_complete(napi);
@@ -2905,7 +2922,8 @@ static int hns3_nic_common_poll(struct napi_struct *napi, int budget)
                hns3_clean_tx_ring(ring);
 
        /* make sure rx ring budget not smaller than 1 */
-       rx_budget = max(budget / tqp_vector->num_tqps, 1);
+       if (tqp_vector->num_tqps > 1)
+               rx_budget = max(budget / tqp_vector->num_tqps, 1);
 
        hns3_for_each_ring(ring, tqp_vector->rx_group) {
                int rx_cleaned = hns3_clean_rx_ring(ring, rx_budget,