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>

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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

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4

drivers/net/ethernet/hisilicon/hns3/hns3_enet.c

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2

drivers/net/ethernet/hisilicon/hns3/hns3_enet.h

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56

drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c

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