[dpdk-dev] [PATCH 2/7] net/hns3: fix xstats statistics with id

[oulijun]

在 2020/12/17 23:20, Ferruh Yigit 写道:
> On 12/13/2020 8:03 AM, Lijun Ou wrote:
>> From: Huisong Li <lihuisong at huawei.com>
>>
>> Number of xstats item in rte_eth_xstats_get_by_id is obtained
>> by the eth_dev_get_xstats_count API, and the xstats_get_by_id
>> ops of the driver only needs to report the corresponding stats
>> item result.
>> However, a redundant code for reporting the number of stats items
>> in the hns3_dev_xstats_get_by_id API causes a problem. Namely, if
>> the ID range of the xstats stats item does not include the basic
>> stats item, the app can not obtain the corresponding xstats
>> statistics in hns3_dev_xstats_get_by_id.
>>
>> Fixes: 8839c5e202f3 ("net/hns3: support device stats")
>> Cc: stable at dpdk.org
>>
>> Signed-off-by: Huisong Li <lihuisong at huawei.com>
>> Signed-off-by: Lijun Ou <oulijun at huawei.com>
>> ---
>>   drivers/net/hns3/hns3_stats.c | 3 ---
>>   1 file changed, 3 deletions(-)
>>
>> diff --git a/drivers/net/hns3/hns3_stats.c 
>> b/drivers/net/hns3/hns3_stats.c
>> index 91168ac..b43143b 100644
>> --- a/drivers/net/hns3/hns3_stats.c
>> +++ b/drivers/net/hns3/hns3_stats.c
>> @@ -933,9 +933,6 @@ hns3_dev_xstats_get_by_id(struct rte_eth_dev *dev, 
>> const uint64_t *ids,
>>       uint32_t i;
>>       int ret;
>> -    if (ids == NULL || size < cnt_stats)
>> -        return cnt_stats;
>> -
> 
> Hi Lijun,
> 
> Above check seems wrong, but just removing it also wrong.
> 
> Following checks should be there:
> ids==NULL && values==NULL ? return cnt_stats
> ids==NULL ? return all values
> 
> Also 'hns3_dev_xstats_get_names_by_id()' seems wrong in that manner.
> 
Thanks for your reviews. It should be deleted with the check in 
hns3_dev_xstats_get_by_id. Because the check have done in the API layer.
for example
   For rte_eth_xstats_get_by_id implementation：
   if ids == NULL and values == NULL, it returns the result of 
eth_dev_get_xstats_count and not run the hns3_dev_xstats_get_by_id

   if ids == NULL, it will not be able to run the hns3_dev_xstats_get_by_id.

However, Maybe the hns3_dev_xstats_get_names_by_id seems wrong and needs 
to fix it as flows:
diff --git a/drivers/net/hns3/hns3_stats.c b/drivers/net/hns3/hns3_stats.c
index 1d1f706..789ff6e 100644
--- a/drivers/net/hns3/hns3_stats.c
+++ b/drivers/net/hns3/hns3_stats.c
@@ -987,8 +987,8 @@ hns3_dev_xstats_get_names_by_id(struct rte_eth_dev *dev,
         uint64_t len;
         uint32_t i;

-       if (ids == NULL || xstats_names == NULL)
-               return cnt_stats;
+       if (ids == NULL)
+               return hns3_dev_xstats_get_names(dev, xstats_names, 
cnt_stats);

         len = cnt_stats * sizeof(struct rte_eth_xstat_name);
         names_copy = rte_zmalloc("hns3_xstats_names", len, 0);

What do you think?
> .
>