[PATCH 02/12] argparse: add argparse library

[fengchengwen]

Hi Thomas,

On 2024/1/24 21:24, Thomas Monjalon wrote:
> 22/01/2024 04:57, Chengwen Feng:
>> Introduce argparse library (which was inspired by the thread [1]). This
>> commit provides public API and doc.
>>
>> [1] https://patchwork.dpdk.org/project/dpdk/patch/20231105054539.22303-2-fengchengwen@huawei.com/
> 
> I'm not sure how this helps with the initial problem
> when using kvargs with key-only.
> I think you should continue fixing kvargs API and usage.

This argparse couldn't direct help to fix kvargs with key-only.

I propose a patchset [1] to fix kvargs with key-only, waiting for more discussion.

[1] https://patchwork.dpdk.org/project/dpdk/cover/20231106073125.55280-1-fengchengwen@huawei.com/

> 
> About a generic argparse library, I imagine it could simplify DPDK internal parsing.
> I have doubts about making it a public library as it is not really a DPDK goal.
> The DMA example looks better with argparse so I imagine we want it.
> 
> I think this library would have a bigger value

In addition to service [argc, argv] parsing, This library also provide API which parse specific type.

For example, user could invoke:
  int value, ret;
  ret = rte_argparse_parse_type(str, RTE_ARGPARSE_ARG_VALUE_INT, &value);

to parse int from a input str.

This API then could used by other library/drivers.

> if we integrate some specific syntax parsing
> like coremask/corelist as done in another patchset:
> https://patches.dpdk.org/project/dpdk/list/?series=30582

Yes, I think it could integrate syntax parsing which providing from above patchset, just:

Define two arg-value type and specify their value storage type requirements:
  /** The argument's value is uint16_t xxx[RTE_MAX_LCORE] type. */
  RTE_ARGPARSE_ARG_VALUE_COREMASK,
  /** The argument's value is uint16_t xxx[RTE_MAX_LCORE] type. */
  RTE_ARGPARSE_ARG_VALUE_CORELIST,

Other library/driver could then invoke:
  uint16_t lcores[RTE_MAX_LCORE];
  int ret;
  ret = rte_argparse_parse_type(str, RTE_ARGPARSE_ARG_VALUE_COREMASK, lcores);
  or
  ret = rte_argparse_parse_type(str, RTE_ARGPARSE_ARG_VALUE_CORELIST, lcores)

Thanks

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