[dpdk-dev] [PATCH] net/nfp: avoid sysfs resource file access

[Ferruh Yigit]

On 6/27/2018 3:27 PM, Ferruh Yigit wrote:
> On 6/26/2018 2:25 PM, Alejandro Lucero wrote:
>> Getting the bar size is required for NFP CPP interface configuration.
>> However, this information can be obtained from the VFIO or UIO driver
>> instead of accessing the sysfs resource file.
>>
>> Signed-off-by: Alejandro Lucero <alejandro.lucero at netronome.com>
>> ---
>>  drivers/net/nfp/nfpcore/nfp_cpp_pcie_ops.c | 27 +++++----------------------
>>  1 file changed, 5 insertions(+), 22 deletions(-)
>>
>> diff --git a/drivers/net/nfp/nfpcore/nfp_cpp_pcie_ops.c b/drivers/net/nfp/nfpcore/nfp_cpp_pcie_ops.c
>> index 2a1ec96..b0beb8d 100644
>> --- a/drivers/net/nfp/nfpcore/nfp_cpp_pcie_ops.c
>> +++ b/drivers/net/nfp/nfpcore/nfp_cpp_pcie_ops.c
>> @@ -762,33 +762,16 @@ struct nfp6000_area_priv {
>>  }
>>  
>>  static int
>> -nfp6000_set_barsz(struct nfp_pcie_user *desc)
>> +nfp6000_set_barsz(struct rte_pci_device *dev, struct nfp_pcie_user *desc)
> 
> Need to update caller of this function.

I can see the that it has been modified in other patch [1], I will move the
change from other patch to here, please double check and confirm the final commits.

[1]
https://patches.dpdk.org/patch/41573/

> 
>>  {
>> -	char tmp_str[80];
>> -	unsigned long start, end, flags, tmp;
>> -	int i;
>> -	FILE *fp;
>> -
>> -	snprintf(tmp_str, sizeof(tmp_str), "%s/%s/resource", PCI_DEVICES,
>> -		 desc->busdev);
>> -
>> -	fp = fopen(tmp_str, "r");
>> -	if (!fp)
>> -		return -1;
>> +	unsigned long tmp;
>> +	int i = 0;
>>  
>> -	if (fscanf(fp, "0x%lx 0x%lx 0x%lx", &start, &end, &flags) == 0) {
>> -		printf("error reading resource file for bar size\n");
>> -		fclose(fp);
>> -		return -1;
>> -	}
>> +	tmp = dev->mem_resource[0].len;
>>  
>> -	if (fclose(fp) == -1)
>> -		return -1;
>> -
>> -	tmp = (end - start) + 1;
>> -	i = 0;
>>  	while (tmp >>= 1)
>>  		i++;
>> +
>>  	desc->barsz = i;
>>  	return 0;
>>  }
>>
>