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net: hns3: add support to set/get tx copybreak buf size via ethtool for hns3 driver

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Tx copybreak buf size is used for tx copybreak feature, the feature is
used for small size packet or frag. It adds a queue based tx shared
bounce buffer to memcpy the small packet when the len of xmitted skb is
below tx_copybreak(value to distinguish small size and normal size),
and reduce the overhead of dma map and unmap when IOMMU is on.

Support setting it via ethtool --set-tunable parameter and getting
it via ethtool --get-tunable parameter.

Signed-off-by: Hao Chen <chenhao288@hisilicon.com>
Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hao Chen 2021-11-18 20:12:41 +08:00 committed by David S. Miller
parent 448f413a8b
commit e445f08af2
3 changed files with 60 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
View file

@ -5532,7 +5532,7 @@ static int hns3_reset_notify_uninit_enet(struct hnae3_handle *handle)
return 0;
}
static int hns3_reset_notify(struct hnae3_handle *handle,
int hns3_reset_notify(struct hnae3_handle *handle,
enum hnae3_reset_notify_type type)
{
int ret = 0;

2
drivers/net/ethernet/hisilicon/hns3/hns3_enet.h
View file

@ -705,6 +705,8 @@ void hns3_set_vector_coalesce_tx_ql(struct hns3_enet_tqp_vector *tqp_vector,
u32 ql_value);
void hns3_request_update_promisc_mode(struct hnae3_handle *handle);
int hns3_reset_notify(struct hnae3_handle *handle,
enum hnae3_reset_notify_type type);
#ifdef CONFIG_HNS3_DCB
void hns3_dcbnl_setup(struct hnae3_handle *handle);

56
drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
View file

@ -1695,6 +1695,7 @@ static int hns3_get_tunable(struct net_device *netdev,
void *data)
{
struct hns3_nic_priv *priv = netdev_priv(netdev);
struct hnae3_handle *h = priv->ae_handle;
int ret = 0;
switch (tuna->id) {
@ -1705,6 +1706,9 @@ static int hns3_get_tunable(struct net_device *netdev,
case ETHTOOL_RX_COPYBREAK:
*(u32 *)data = priv->rx_copybreak;
break;
case ETHTOOL_TX_COPYBREAK_BUF_SIZE:
*(u32 *)data = h->kinfo.tx_spare_buf_size;
break;
default:
ret = -EOPNOTSUPP;
break;
@ -1713,11 +1717,43 @@ static int hns3_get_tunable(struct net_device *netdev,
return ret;
}
static int hns3_set_tx_spare_buf_size(struct net_device *netdev,
u32 data)
{
struct hns3_nic_priv *priv = netdev_priv(netdev);
struct hnae3_handle *h = priv->ae_handle;
int ret;
if (hns3_nic_resetting(netdev))
return -EBUSY;
h->kinfo.tx_spare_buf_size = data;
ret = hns3_reset_notify(h, HNAE3_DOWN_CLIENT);
if (ret)
return ret;
ret = hns3_reset_notify(h, HNAE3_UNINIT_CLIENT);
if (ret)
return ret;
ret = hns3_reset_notify(h, HNAE3_INIT_CLIENT);
if (ret)
return ret;
ret = hns3_reset_notify(h, HNAE3_UP_CLIENT);
if (ret)
hns3_reset_notify(h, HNAE3_UNINIT_CLIENT);
return ret;
}
static int hns3_set_tunable(struct net_device *netdev,
const struct ethtool_tunable *tuna,
const void *data)
{
struct hns3_nic_priv *priv = netdev_priv(netdev);
u32 old_tx_spare_buf_size, new_tx_spare_buf_size;
struct hnae3_handle *h = priv->ae_handle;
int i, ret = 0;
@ -1735,6 +1771,26 @@ static int hns3_set_tunable(struct net_device *netdev,
for (i = h->kinfo.num_tqps; i < h->kinfo.num_tqps * 2; i++)
priv->ring[i].rx_copybreak = priv->rx_copybreak;
break;
case ETHTOOL_TX_COPYBREAK_BUF_SIZE:
old_tx_spare_buf_size = h->kinfo.tx_spare_buf_size;
new_tx_spare_buf_size = *(u32 *)data;
ret = hns3_set_tx_spare_buf_size(netdev, new_tx_spare_buf_size);
if (ret) {
int ret1;
netdev_warn(netdev,
"change tx spare buf size fail, revert to old value\n");
ret1 = hns3_set_tx_spare_buf_size(netdev,
old_tx_spare_buf_size);
if (ret1) {
netdev_err(netdev,
"revert to old tx spare buf size fail\n");
return ret1;
}
return ret;
}
break;
default:
ret = -EOPNOTSUPP;