[v2,1/4] net/cpfl: parse flow parser file in devargs

  Add devargs "flow_parser" for rte_flow json parser.

Signed-off-by: Wenjing Qiao <wenjing.qiao@intel.com>
---
Depends-on: series-29139 ("net/cpfl: support port representor")
---
 drivers/net/cpfl/cpfl_ethdev.c | 30 +++++++++++++++++++++++++++++-
 drivers/net/cpfl/cpfl_ethdev.h |  3 +++
 drivers/net/cpfl/meson.build   |  6 ++++++
 3 files changed, 38 insertions(+), 1 deletion(-)
  

> -----Original Message-----
> From: Qiao, Wenjing <wenjing.qiao@intel.com>
> Sent: Friday, August 11, 2023 6:00 PM
> To: Zhang, Yuying <yuying.zhang@intel.com>; Xing, Beilei
> <beilei.xing@intel.com>
> Cc: dev@dpdk.org; Liu, Mingxia <mingxia.liu@intel.com>; Qiao, Wenjing
> <wenjing.qiao@intel.com>
> Subject: [PATCH v2 1/4] net/cpfl: parse flow parser file in devargs
> 
> Add devargs "flow_parser" for rte_flow json parser.
> 
> Signed-off-by: Wenjing Qiao <wenjing.qiao@intel.com>
> ---
> Depends-on: series-29139 ("net/cpfl: support port representor")
> ---
>  drivers/net/cpfl/cpfl_ethdev.c | 30 +++++++++++++++++++++++++++++-
> drivers/net/cpfl/cpfl_ethdev.h |  3 +++
>  drivers/net/cpfl/meson.build   |  6 ++++++
>  3 files changed, 38 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/cpfl/cpfl_ethdev.c b/drivers/net/cpfl/cpfl_ethdev.c index
> 8dbc175749..a2f308fb86 100644
> --- a/drivers/net/cpfl/cpfl_ethdev.c
> +++ b/drivers/net/cpfl/cpfl_ethdev.c
> @@ -21,6 +21,7 @@
>  #define CPFL_TX_SINGLE_Q	"tx_single"
>  #define CPFL_RX_SINGLE_Q	"rx_single"
>  #define CPFL_VPORT		"vport"
> +#define CPFL_FLOW_PARSER	"flow_parser"
> 
>  rte_spinlock_t cpfl_adapter_lock;
>  /* A list for all adapters, one adapter matches one PCI device */ @@ -32,6
> +33,9 @@ static const char * const cpfl_valid_args_first[] = {
>  	CPFL_TX_SINGLE_Q,
>  	CPFL_RX_SINGLE_Q,
>  	CPFL_VPORT,
> +#ifdef CPFL_FLOW_JSON_SUPPORT
> +	CPFL_FLOW_PARSER,
> +#endif
>  	NULL
>  };
> 
> @@ -1671,6 +1675,19 @@ parse_repr(const char *key __rte_unused, const
> char *value, void *args)
>  	return 0;
>  }
> 
> +#ifdef CPFL_FLOW_JSON_SUPPORT
> +static int
> +parse_parser_file(const char *key, const char *value, void *args) {
> +	char *name = args;
> +
> +	PMD_DRV_LOG(DEBUG, "value:\"%s\" for key:\"%s\"", value, key);

Better to check if the value is valid first, e.g. return error if the length > CPFL_FLOW_FILE_LEN.

> +	strlcpy(name, value, CPFL_FLOW_FILE_LEN);
> +
> +	return 0;
> +}
> +#endif
> +
>  static int
>  cpfl_parse_devargs(struct rte_pci_device *pci_dev, struct cpfl_adapter_ext
> *adapter, bool first)  { @@ -1719,7 +1736,18 @@ cpfl_parse_devargs(struct
> rte_pci_device *pci_dev, struct cpfl_adapter_ext *adap
>  				 &adapter->base.is_rx_singleq);
>  	if (ret != 0)
>  		goto fail;
> -
> +#ifdef CPFL_FLOW_JSON_SUPPORT
> +	if (rte_kvargs_get(kvlist, CPFL_FLOW_PARSER)) {
> +		ret = rte_kvargs_process(kvlist, CPFL_FLOW_PARSER,
> +					 &parse_parser_file, cpfl_args-
> >flow_parser);
> +		if (ret) {
> +			PMD_DRV_LOG(ERR, "Failed to parser flow_parser,
> ret: %d", ret);
> +			goto fail;
> +		}
> +	} else {
> +		cpfl_args->flow_parser[0] = '\0';
> +	}
> +#endif
>  fail:
>  	rte_kvargs_free(kvlist);
>  	return ret;
> diff --git a/drivers/net/cpfl/cpfl_ethdev.h b/drivers/net/cpfl/cpfl_ethdev.h
> index 5bd6f930b8..cf989a29b3 100644
> --- a/drivers/net/cpfl/cpfl_ethdev.h
> +++ b/drivers/net/cpfl/cpfl_ethdev.h
> @@ -87,6 +87,8 @@
>  #define ACC_LCE_ID	15
>  #define IMC_MBX_EFD_ID	0
> 
> +#define CPFL_FLOW_FILE_LEN 100
> +
>  struct cpfl_vport_param {
>  	struct cpfl_adapter_ext *adapter;
>  	uint16_t devarg_id; /* arg id from user */ @@ -100,6 +102,7 @@
> struct cpfl_devargs {
>  	uint16_t req_vport_nb;
>  	uint8_t repr_args_num;
>  	struct rte_eth_devargs repr_args[CPFL_REPR_ARG_NUM_MAX];
> +	char flow_parser[CPFL_FLOW_FILE_LEN];
>  };
> 
>  struct p2p_queue_chunks_info {
> diff --git a/drivers/net/cpfl/meson.build b/drivers/net/cpfl/meson.build index
> fb075c6860..0be25512c3 100644
> --- a/drivers/net/cpfl/meson.build
> +++ b/drivers/net/cpfl/meson.build
> @@ -38,3 +38,9 @@ if arch_subdir == 'x86'
>          cflags += ['-DCC_AVX512_SUPPORT']
>      endif
>  endif
> +
> +js_dep = dependency('json-c', required: false, method : 'pkg-config')
> +if js_dep.found()
> +    dpdk_conf.set('CPFL_FLOW_JSON_SUPPORT', true)
> +    ext_deps += js_dep
> +endif
> \ No newline at end of file
> --
> 2.34.1

Update doc to describe installing json lib first if need to parse json file.