On 3/10/2021 6:16 AM, Min Hu (Connor) wrote:
From: Chengwen Feng <fengcheng...@huawei.com>
Kunpeng 930 support Tx push mode which could improve performance, It
works like below:
1. Add pcie bar45 which support driver direct write the Tx descriptor
or tail reg to it.
2. Support three operations: a) direct write one Tx descriptor, b)
direct write two Tx descriptors, c) direct write tail reg.
3. The original tail reg located at bar23, the above bar45 tail reg
could provide better bandwidth from the hardware perspective.
The hns3 driver only support direct write tail reg (also have the name
of quick doorbell), the detail:
1. Considering compatibility, firmware will report Tx push capa if the
hardware support it.
2. Add control macro RTE_LIBRTE_HNS3_ENABLE_TX_PUSH which was not
defined default.
3. If user define macro RTE_LIBRTE_HNS3_ENABLE_TX_PUSH and hardware
support, then driver will direct write bar45 tail reg to inform the
hardware.
Can you convert the copile time 'RTE_LIBRTE_HNS3_ENABLE_TX_PUSH' flag to runtime
device argument?
There is already 'tx_push_enable' variable check on datapath, so converting to
devarg shouldn't add any additional checks and shouldn't have performance impact.
Signed-off-by: Chengwen Feng <fengcheng...@huawei.com>
Signed-off-by: Min Hu (Connor) <humi...@huawei.com>
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