[PATCH net 07/19] net: hns: Optimize hns_nic_common_poll for better performance

[Salil Mehta]

From: lipeng <lipeng...@huawei.com>

After polling less than buget packages, we need check again. If
there are still some packages, we call napi_schedule add softirq
queue, this is not better way. So we return buget value instead
of napi_schedule.

Signed-off-by: lipeng <lipeng...@huawei.com>
reviewed-by: Yisen Zhuang <yisen.zhu...@huawei.com>
Signed-off-by: Salil Mehta <salil.me...@huawei.com>
---
 drivers/net/ethernet/hisilicon/hns/hns_enet.c | 50 ++++++++++++++++-----------
 drivers/net/ethernet/hisilicon/hns/hns_enet.h |  2 +-
 2 files changed, 31 insertions(+), 21 deletions(-)

diff --git a/drivers/net/ethernet/hisilicon/hns/hns_enet.c 
b/drivers/net/ethernet/hisilicon/hns/hns_enet.c
index 646f601..a083660 100644
--- a/drivers/net/ethernet/hisilicon/hns/hns_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns/hns_enet.c
@@ -861,7 +861,7 @@ static int hns_nic_rx_poll_one(struct hns_nic_ring_data 
*ring_data,
        return recv_pkts;
 }
 
-static void hns_nic_rx_fini_pro(struct hns_nic_ring_data *ring_data)
+static bool hns_nic_rx_fini_pro(struct hns_nic_ring_data *ring_data)
 {
        struct hnae_ring *ring = ring_data->ring;
        int num = 0;
@@ -875,22 +875,23 @@ static void hns_nic_rx_fini_pro(struct hns_nic_ring_data 
*ring_data)
                ring_data->ring->q->handle->dev->ops->toggle_ring_irq(
                        ring_data->ring, 1);
 
-               napi_schedule(&ring_data->napi);
+               return false;
+       } else {
+               return true;
        }
 }
 
-static void hns_nic_rx_fini_pro_v2(struct hns_nic_ring_data *ring_data)
+static bool hns_nic_rx_fini_pro_v2(struct hns_nic_ring_data *ring_data)
 {
        struct hnae_ring *ring = ring_data->ring;
-       int num = 0;
+       int num;
 
        num = readl_relaxed(ring->io_base + RCB_REG_FBDNUM);
 
-       if (num == 0)
-               ring_data->ring->q->handle->dev->ops->toggle_ring_irq(
-                       ring, 0);
+       if (!num)
+               return true;
        else
-               napi_schedule(&ring_data->napi);
+               return false;
 }
 
 static inline void hns_nic_reclaim_one_desc(struct hnae_ring *ring,
@@ -991,7 +992,7 @@ static int hns_nic_tx_poll_one(struct hns_nic_ring_data 
*ring_data,
        return 0;
 }
 
-static void hns_nic_tx_fini_pro(struct hns_nic_ring_data *ring_data)
+static bool hns_nic_tx_fini_pro(struct hns_nic_ring_data *ring_data)
 {
        struct hnae_ring *ring = ring_data->ring;
        int head;
@@ -1004,20 +1005,21 @@ static void hns_nic_tx_fini_pro(struct 
hns_nic_ring_data *ring_data)
                ring_data->ring->q->handle->dev->ops->toggle_ring_irq(
                        ring_data->ring, 1);
 
-               napi_schedule(&ring_data->napi);
+               return false;
+       } else {
+               return true;
        }
 }
 
-static void hns_nic_tx_fini_pro_v2(struct hns_nic_ring_data *ring_data)
+static bool hns_nic_tx_fini_pro_v2(struct hns_nic_ring_data *ring_data)
 {
        struct hnae_ring *ring = ring_data->ring;
        int head = readl_relaxed(ring->io_base + RCB_REG_HEAD);
 
        if (head == ring->next_to_clean)
-               ring_data->ring->q->handle->dev->ops->toggle_ring_irq(
-                       ring, 0);
+               return true;
        else
-               napi_schedule(&ring_data->napi);
+               return false;
 }
 
 static void hns_nic_tx_clr_all_bufs(struct hns_nic_ring_data *ring_data)
@@ -1044,15 +1046,23 @@ static void hns_nic_tx_clr_all_bufs(struct 
hns_nic_ring_data *ring_data)
 
 static int hns_nic_common_poll(struct napi_struct *napi, int budget)
 {
+       int clean_complete = 0;
        struct hns_nic_ring_data *ring_data =
                container_of(napi, struct hns_nic_ring_data, napi);
-       int clean_complete = ring_data->poll_one(
-                               ring_data, budget, ring_data->ex_process);
+       struct hnae_ring *ring = ring_data->ring;
 
-       if (clean_complete >= 0 && clean_complete < budget) {
-               napi_complete(napi);
-               ring_data->fini_process(ring_data);
-               return 0;
+try_again:
+       clean_complete += ring_data->poll_one(
+                               ring_data, budget - clean_complete,
+                               ring_data->ex_process);
+
+       if (clean_complete < budget) {
+               if (ring_data->fini_process(ring_data)) {
+                       napi_complete(napi);
+                       ring->q->handle->dev->ops->toggle_ring_irq(ring, 0);
+               } else {
+                       goto try_again;
+               }
        }
 
        return clean_complete;
diff --git a/drivers/net/ethernet/hisilicon/hns/hns_enet.h 
b/drivers/net/ethernet/hisilicon/hns/hns_enet.h
index fff8f8a..1b83232 100644
--- a/drivers/net/ethernet/hisilicon/hns/hns_enet.h
+++ b/drivers/net/ethernet/hisilicon/hns/hns_enet.h
@@ -41,7 +41,7 @@ struct hns_nic_ring_data {
        int queue_index;
        int (*poll_one)(struct hns_nic_ring_data *, int, void *);
        void (*ex_process)(struct hns_nic_ring_data *, struct sk_buff *);
-       void (*fini_process)(struct hns_nic_ring_data *);
+       bool (*fini_process)(struct hns_nic_ring_data *);
 };
 
 /* compatible the difference between two versions */
-- 
2.7.4