[PATCH 01/16] net/hns3: fix possible truncation of hash key when config

[lihuisong (C)]

在 2023/3/11 3:36, Ferruh Yigit 写道:
> On 3/10/2023 9:35 AM, Dongdong Liu wrote:
>> From: Huisong Li <lihuisong at huawei.com>
>>
>> The hash key length of hns3 driver is obtained from firmware. If the
>> length isn't a multiple of HNS3_RSS_HASH_KEY_NUM (16), the last part
>> of hash key will be truncated.
>>
> I am not sure if the explanation is correct, according below code last
> part of the key is truncated if key_len *is* multiple of
> HNS3_RSS_HASH_KEY_NUM.
>
> Because code assumes "key_len % HNS3_RSS_HASH_KEY_NUM" will give the
> remaining part of the key, but when key_len is multiple of
> HNS3_RSS_HASH_KEY_NUM it gives 0, causing last HNS3_RSS_HASH_KEY_NUM
> chunk truncated.
>
> If above understanding correct, I can fix commit log while merging.
Sorry for my late reply. Your understanding correct. Thanks.
>
>> Fixes: 4a7384e3c34d ("net/hns3: refactor set RSS hash algorithm and key interface")
>> Fixes: c37ca66f2b27 ("net/hns3: support RSS")
>> Cc: stable at dpdk.org
>>
> I am not sure if `c37ca66f2b27 ("net/hns3: support RSS")` is needed
> here, issue seems because of commit 4a7384e3c34d, so this should be:
>
> Fixes: 4a7384e3c34d ("net/hns3: refactor set RSS hash algorithm and key
> interface")
> Cc: stable at dpdk.org
>
>
>> Signed-off-by: Huisong Li <lihuisong at huawei.com>
>> Signed-off-by: Dongdong Liu <liudongdong3 at huawei.com>
>> ---
>>   drivers/net/hns3/hns3_rss.c | 3 ++-
>>   1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/net/hns3/hns3_rss.c b/drivers/net/hns3/hns3_rss.c
>> index d6e0754273..2011c18b9b 100644
>> --- a/drivers/net/hns3/hns3_rss.c
>> +++ b/drivers/net/hns3/hns3_rss.c
>> @@ -301,7 +301,8 @@ hns3_rss_set_algo_key(struct hns3_hw *hw, uint8_t hash_algo,
>>   		req->hash_config |= (hash_algo & HNS3_RSS_HASH_ALGO_MASK);
>>   		req->hash_config |= (idx << HNS3_RSS_HASH_KEY_OFFSET_B);
>>   
>> -		if (idx == max_bd_num - 1)
>> +		if (idx == max_bd_num - 1 &&
>> +		    (key_len % HNS3_RSS_HASH_KEY_NUM) != 0)
>>   			cur_key_size = key_len % HNS3_RSS_HASH_KEY_NUM;
>>   		else
>>   			cur_key_size = HNS3_RSS_HASH_KEY_NUM;
> .