On 2022/10/26 22:00, Gal Pressman wrote:

On 18/11/2021 14:12, Guangbin Huang wrote:

quoted

From: Hao Chen <redacted>

This series add support to set/get tx copybreak buf size and rx buf len via
ethtool and hns3 driver implements them.

Tx copybreak buf size is used for tx copybreak feature which for small size
packet or frag. Use ethtool --get-tunable command to get it, and ethtool
--set-tunable command to set it, examples are as follow:

1. set tx spare buf size to 102400:
$ ethtool --set-tunable eth1 tx-buf-size 102400

2. get tx spare buf size:
$ ethtool --get-tunable eth1 tx-buf-size
tx-buf-size: 102400

Hi Guangbin,
Can you please clarify the difference between TX copybreak and TX
copybreak buf size?

Hi Gal,
'TX copybreak buf size' is the size of buffer allocated to a queue
in order to support copybreak handling when skb->len <= 'TX copybreak',

see hns3_can_use_tx_bounce() for 'TX copybreak' and
hns3_init_tx_spare_buffer() for 'TX copybreak buf size'.

.