Re: [dpdk-dev] [PATCH 2/2] net/hns3: support IEEE 1588 PTP

[Thomas Monjalon <thomas@monjalon.net>]

31/03/2021 04:35, Min Hu (Connor):
> 在 2021/3/30 21:59, Ferruh Yigit 写道:
> > On 3/26/2021 8:56 AM, Min Hu (Connor) wrote:
> >> Add hns3 support for new ethdev APIs to enable and read IEEE1588/
> >> 802.1AS PTP timestamps.
> >>
> >> Signed-off-by: Min Hu (Connor) <humin29@huawei.com>
> >> --- a/drivers/net/hns3/hns3_cmd.h
> >> +++ b/drivers/net/hns3/hns3_cmd.h
> >> @@ -123,6 +123,12 @@ enum hns3_opcode_type {
> >>       HNS3_OPC_CLEAR_MAC_TNL_INT      = 0x0312,
> >>       HNS3_OPC_CONFIG_FEC_MODE        = 0x031A,
> >> +#ifdef RTE_LIBRTE_IEEE1588
> >> +    /* PTP command */
> >> +    HNS3_OPC_PTP_INT_EN             = 0x0501,
> >> +    HNS3_OPC_CFG_PTP_MODE           = 0x0507,
> >> +#endif
> >> +
> > 
> > Hi Connor,
> > 
> > Does it needs to be a compile time configuration? What happens if it is 
> > always enabled, or controlled by device argument?
> > .
> Hi Ferruh,
> 	Firstly the "RTE_LIBRTE_IEEE1588" origins from the config file in DPDK. 
> Almost every nic driver use this macro in compile time.
> 	For me, I think using this macro give one option for users to
> decide if his APPs contains this module. For example, in loT field,
> some microprocessor has small memory or small disk, So the APPs should 
> be as small as possible. So, if user does not need "PTP", the APPs no
> need to contain it.
> 	Well, another top, if is always enabled, for HNS3 PMD, it will
> work well for our nic. If user want to use "PTP", just call API. If user
> does not use it, it also doesn't matter. But we advise that if user
> don't need this function, just turn it off.
> 	Thanks.

Disabling at compile-time does not reduce the footprint significantly.
RTE_LIBRTE_IEEE1588 should disappear, so I advise not using it
in new code. Instead, you could enable/disable at runtime if needed.