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Subject[PATCH net-next 05/11] net: hns3: add support for dynamic interrupt moderation
Date
Add dynamic interrupt moderation support for the HNS3 driver.

Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
---
drivers/net/ethernet/hisilicon/Kconfig | 1 +
drivers/net/ethernet/hisilicon/hns3/hns3_enet.c | 87 ++++++++++++++++++++++++-
drivers/net/ethernet/hisilicon/hns3/hns3_enet.h | 4 ++
3 files changed, 91 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/hisilicon/Kconfig b/drivers/net/ethernet/hisilicon/Kconfig
index 44f9279..fa6025d 100644
--- a/drivers/net/ethernet/hisilicon/Kconfig
+++ b/drivers/net/ethernet/hisilicon/Kconfig
@@ -130,6 +130,7 @@ config HNS3_ENET
default m
depends on 64BIT && PCI
depends on INET
+ select DIMLIB
help
This selects the Ethernet Driver for Hisilicon Network Subsystem 3 for hip08
family of SoCs. This module depends upon HNAE3 driver to access the HNAE3
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
index 999a2aa..9e895b9 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -96,6 +96,7 @@ static irqreturn_t hns3_irq_handle(int irq, void *vector)
struct hns3_enet_tqp_vector *tqp_vector = vector;

napi_schedule_irqoff(&tqp_vector->napi);
+ tqp_vector->event_cnt++;

return IRQ_HANDLED;
}
@@ -199,6 +200,8 @@ static void hns3_vector_disable(struct hns3_enet_tqp_vector *tqp_vector)

disable_irq(tqp_vector->vector_irq);
napi_disable(&tqp_vector->napi);
+ cancel_work_sync(&tqp_vector->rx_group.dim.work);
+ cancel_work_sync(&tqp_vector->tx_group.dim.work);
}

void hns3_set_vector_coalesce_rl(struct hns3_enet_tqp_vector *tqp_vector,
@@ -3401,6 +3404,32 @@ static void hns3_update_new_int_gl(struct hns3_enet_tqp_vector *tqp_vector)
tqp_vector->last_jiffies = jiffies;
}

+static void hns3_update_rx_int_coalesce(struct hns3_enet_tqp_vector *tqp_vector)
+{
+ struct hns3_enet_ring_group *rx_group = &tqp_vector->rx_group;
+ struct dim_sample sample = {};
+
+ if (!rx_group->coal.adapt_enable)
+ return;
+
+ dim_update_sample(tqp_vector->event_cnt, rx_group->total_packets,
+ rx_group->total_bytes, &sample);
+ net_dim(&rx_group->dim, sample);
+}
+
+static void hns3_update_tx_int_coalesce(struct hns3_enet_tqp_vector *tqp_vector)
+{
+ struct hns3_enet_ring_group *tx_group = &tqp_vector->tx_group;
+ struct dim_sample sample = {};
+
+ if (!tx_group->coal.adapt_enable)
+ return;
+
+ dim_update_sample(tqp_vector->event_cnt, tx_group->total_packets,
+ tx_group->total_bytes, &sample);
+ net_dim(&tx_group->dim, sample);
+}
+
static int hns3_nic_common_poll(struct napi_struct *napi, int budget)
{
struct hns3_nic_priv *priv = netdev_priv(napi->dev);
@@ -3444,7 +3473,13 @@ static int hns3_nic_common_poll(struct napi_struct *napi, int budget)

if (napi_complete(napi) &&
likely(!test_bit(HNS3_NIC_STATE_DOWN, &priv->state))) {
- hns3_update_new_int_gl(tqp_vector);
+ if (test_bit(HNS3_NIC_STATE_DIM_ENABLE, &priv->state)) {
+ hns3_update_rx_int_coalesce(tqp_vector);
+ hns3_update_tx_int_coalesce(tqp_vector);
+ } else {
+ hns3_update_new_int_gl(tqp_vector);
+ }
+
hns3_mask_vector_irq(tqp_vector, 1);
}

@@ -3575,6 +3610,54 @@ static void hns3_nic_set_cpumask(struct hns3_nic_priv *priv)
}
}

+static void hns3_rx_dim_work(struct work_struct *work)
+{
+ struct dim *dim = container_of(work, struct dim, work);
+ struct hns3_enet_ring_group *group = container_of(dim,
+ struct hns3_enet_ring_group, dim);
+ struct hns3_enet_tqp_vector *tqp_vector = group->ring->tqp_vector;
+ struct dim_cq_moder cur_moder =
+ net_dim_get_rx_moderation(dim->mode, dim->profile_ix);
+
+ hns3_set_vector_coalesce_rx_gl(group->ring->tqp_vector, cur_moder.usec);
+ tqp_vector->rx_group.coal.int_gl = cur_moder.usec;
+
+ if (cur_moder.pkts < tqp_vector->rx_group.coal.int_ql_max) {
+ hns3_set_vector_coalesce_rx_ql(tqp_vector, cur_moder.pkts);
+ tqp_vector->rx_group.coal.int_ql = cur_moder.pkts;
+ }
+
+ dim->state = DIM_START_MEASURE;
+}
+
+static void hns3_tx_dim_work(struct work_struct *work)
+{
+ struct dim *dim = container_of(work, struct dim, work);
+ struct hns3_enet_ring_group *group = container_of(dim,
+ struct hns3_enet_ring_group, dim);
+ struct hns3_enet_tqp_vector *tqp_vector = group->ring->tqp_vector;
+ struct dim_cq_moder cur_moder =
+ net_dim_get_tx_moderation(dim->mode, dim->profile_ix);
+
+ hns3_set_vector_coalesce_tx_gl(tqp_vector, cur_moder.usec);
+ tqp_vector->tx_group.coal.int_gl = cur_moder.usec;
+
+ if (cur_moder.pkts < tqp_vector->tx_group.coal.int_ql_max) {
+ hns3_set_vector_coalesce_tx_ql(tqp_vector, cur_moder.pkts);
+ tqp_vector->tx_group.coal.int_ql = cur_moder.pkts;
+ }
+
+ dim->state = DIM_START_MEASURE;
+}
+
+static void hns3_nic_init_dim(struct hns3_enet_tqp_vector *tqp_vector)
+{
+ INIT_WORK(&tqp_vector->rx_group.dim.work, hns3_rx_dim_work);
+ tqp_vector->rx_group.dim.mode = DIM_CQ_PERIOD_MODE_START_FROM_EQE;
+ INIT_WORK(&tqp_vector->tx_group.dim.work, hns3_tx_dim_work);
+ tqp_vector->tx_group.dim.mode = DIM_CQ_PERIOD_MODE_START_FROM_EQE;
+}
+
static int hns3_nic_init_vector_data(struct hns3_nic_priv *priv)
{
struct hnae3_ring_chain_node vector_ring_chain;
@@ -3589,6 +3672,7 @@ static int hns3_nic_init_vector_data(struct hns3_nic_priv *priv)
tqp_vector = &priv->tqp_vector[i];
hns3_vector_coalesce_init_hw(tqp_vector, priv);
tqp_vector->num_tqps = 0;
+ hns3_nic_init_dim(tqp_vector);
}

for (i = 0; i < h->kinfo.num_tqps; i++) {
@@ -4161,6 +4245,7 @@ static int hns3_client_init(struct hnae3_handle *handle)
netdev->max_mtu = HNS3_MAX_MTU;

set_bit(HNS3_NIC_STATE_INITED, &priv->state);
+ set_bit(HNS3_NIC_STATE_DIM_ENABLE, &priv->state);

if (netif_msg_drv(handle))
hns3_info_show(priv);
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h
index 8d33652..eb4e7ef 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.h
@@ -4,6 +4,7 @@
#ifndef __HNS3_ENET_H
#define __HNS3_ENET_H

+#include <linux/dim.h>
#include <linux/if_vlan.h>

#include "hnae3.h"
@@ -18,6 +19,7 @@ enum hns3_nic_state {
HNS3_NIC_STATE_SERVICE_INITED,
HNS3_NIC_STATE_SERVICE_SCHED,
HNS3_NIC_STATE2_RESET_REQUESTED,
+ HNS3_NIC_STATE_DIM_ENABLE,
HNS3_NIC_STATE_MAX
};

@@ -449,6 +451,7 @@ struct hns3_enet_ring_group {
u64 total_packets; /* total packets processed this group */
u16 count;
struct hns3_enet_coalesce coal;
+ struct dim dim;
};

struct hns3_enet_tqp_vector {
@@ -471,6 +474,7 @@ struct hns3_enet_tqp_vector {
char name[HNAE3_INT_NAME_LEN];

unsigned long last_jiffies;
+ u64 event_cnt;
} ____cacheline_internodealigned_in_smp;

struct hns3_nic_priv {
--
2.7.4
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